drivers/infiniband/hw/i40iw/i40iw

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This source file includes following definitions.
i40iw_free_sqbuf
i40iw_derive_hw_ird_setting
i40iw_record_ird_ord
i40iw_copy_ip_ntohl
i40iw_copy_ip_htonl
i40iw_fill_sockaddr4
i40iw_fill_sockaddr6
i40iw_get_addr_info
i40iw_get_cmevent_info
i40iw_send_cm_event
i40iw_create_event
i40iw_free_retrans_entry
i40iw_cleanup_retrans_entry
i40iw_form_cm_frame
i40iw_send_reset
i40iw_active_open_err
i40iw_passive_open_err
i40iw_event_connect_error
i40iw_process_options
i40iw_handle_tcp_options
i40iw_build_mpa_v1
i40iw_build_mpa_v2
i40iw_cm_build_mpa_frame
i40iw_send_mpa_request
i40iw_send_mpa_reject
i40iw_parse_mpa
i40iw_schedule_cm_timer
i40iw_retrans_expired
i40iw_handle_close_entry
i40iw_build_timer_list
i40iw_cm_timer_tick
i40iw_send_syn
i40iw_send_ack
i40iw_send_fin
i40iw_find_node
i40iw_find_listener
i40iw_add_hte_node
i40iw_find_port
i40iw_port_in_use
i40iw_del_multiple_qhash
i40iw_netdev_vlan_ipv6
i40iw_get_vlan_ipv4
i40iw_add_mqh_6
i40iw_add_mqh_4
i40iw_dec_refcnt_listen
i40iw_cm_del_listen
i40iw_addr_resolve_neigh
i40iw_get_dst_ipv6
i40iw_addr_resolve_neigh_ipv6
i40iw_ipv4_is_loopback
i40iw_ipv6_is_loopback
i40iw_make_cm_node
i40iw_rem_ref_cm_node
i40iw_handle_fin_pkt
i40iw_handle_rst_pkt
i40iw_handle_rcv_mpa
i40iw_indicate_pkt_err
i40iw_check_syn
i40iw_check_seq
i40iw_handle_syn_pkt
i40iw_handle_synack_pkt
i40iw_handle_ack_pkt
i40iw_process_packet
i40iw_make_listen_node
i40iw_create_cm_node
i40iw_cm_reject
i40iw_cm_close
i40iw_receive_ilq
i40iw_setup_cm_core
i40iw_cleanup_cm_core
i40iw_init_tcp_ctx
i40iw_cm_init_tsa_conn
i40iw_cm_disconn
i40iw_qp_disconnect
i40iw_cm_disconn_true
i40iw_disconnect_worker
i40iw_accept
i40iw_reject
i40iw_connect
i40iw_create_listen
i40iw_destroy_listen
i40iw_cm_event_connected
i40iw_cm_event_reset
i40iw_cm_event_handler
i40iw_cm_post_event
i40iw_qhash_ctrl
i40iw_cm_teardown_connections
i40iw_if_notify
   1 /*******************************************************************************
   2 *
   3 * Copyright (c) 2015-2016 Intel Corporation.  All rights reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the
   9 * OpenFabrics.org BSD license below:
  10 *
  11 *   Redistribution and use in source and binary forms, with or
  12 *   without modification, are permitted provided that the following
  13 *   conditions are met:
  14 *
  15 *    - Redistributions of source code must retain the above
  16 *       copyright notice, this list of conditions and the following
  17 *       disclaimer.
  18 *
  19 *    - Redistributions in binary form must reproduce the above
  20 *       copyright notice, this list of conditions and the following
  21 *       disclaimer in the documentation and/or other materials
  22 *       provided with the distribution.
  23 *
  24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31 * SOFTWARE.
  32 *
  33 *******************************************************************************/
  34 
  35 #include <linux/atomic.h>
  36 #include <linux/ip.h>
  37 #include <linux/tcp.h>
  38 #include <linux/init.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/if_vlan.h>
  41 #include <linux/notifier.h>
  42 #include <linux/net.h>
  43 #include <linux/types.h>
  44 #include <linux/timer.h>
  45 #include <linux/time.h>
  46 #include <linux/delay.h>
  47 #include <linux/etherdevice.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/random.h>
  50 #include <linux/list.h>
  51 #include <linux/threads.h>
  52 #include <linux/highmem.h>
  53 #include <net/arp.h>
  54 #include <net/ndisc.h>
  55 #include <net/neighbour.h>
  56 #include <net/route.h>
  57 #include <net/addrconf.h>
  58 #include <net/ip6_route.h>
  59 #include <net/ip_fib.h>
  60 #include <net/secure_seq.h>
  61 #include <net/tcp.h>
  62 #include <asm/checksum.h>
  63 
  64 #include "i40iw.h"
  65 
  66 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *);
  67 static void i40iw_cm_post_event(struct i40iw_cm_event *event);
  68 static void i40iw_disconnect_worker(struct work_struct *work);
  69 
  70 /**
  71  * i40iw_free_sqbuf - put back puda buffer if refcount = 0
  72  * @vsi: pointer to vsi structure
  73  * @buf: puda buffer to free
  74  */
  75 void i40iw_free_sqbuf(struct i40iw_sc_vsi *vsi, void *bufp)
  76 {
  77         struct i40iw_puda_buf *buf = (struct i40iw_puda_buf *)bufp;
  78         struct i40iw_puda_rsrc *ilq = vsi->ilq;
  79 
  80         if (!atomic_dec_return(&buf->refcount))
  81                 i40iw_puda_ret_bufpool(ilq, buf);
  82 }
  83 
  84 /**
  85  * i40iw_derive_hw_ird_setting - Calculate IRD
  86  *
  87  * @cm_ird: IRD of connection's node
  88  *
  89  * The ird from the connection is rounded to a supported HW
  90  * setting (2,8,32,64) and then encoded for ird_size field of
  91  * qp_ctx
  92  */
  93 static u8 i40iw_derive_hw_ird_setting(u16 cm_ird)
  94 {
  95         u8 encoded_ird_size;
  96 
  97         /* ird_size field is encoded in qp_ctx */
  98         switch (cm_ird ? roundup_pow_of_two(cm_ird) : 0) {
  99         case I40IW_HW_IRD_SETTING_64:
 100                 encoded_ird_size = 3;
 101                 break;
 102         case I40IW_HW_IRD_SETTING_32:
 103         case I40IW_HW_IRD_SETTING_16:
 104                 encoded_ird_size = 2;
 105                 break;
 106         case I40IW_HW_IRD_SETTING_8:
 107         case I40IW_HW_IRD_SETTING_4:
 108                 encoded_ird_size = 1;
 109                 break;
 110         case I40IW_HW_IRD_SETTING_2:
 111         default:
 112                 encoded_ird_size = 0;
 113                 break;
 114         }
 115         return encoded_ird_size;
 116 }
 117 
 118 /**
 119  * i40iw_record_ird_ord - Record IRD/ORD passed in
 120  * @cm_node: connection's node
 121  * @conn_ird: connection IRD
 122  * @conn_ord: connection ORD
 123  */
 124 static void i40iw_record_ird_ord(struct i40iw_cm_node *cm_node, u32 conn_ird,
 125                                  u32 conn_ord)
 126 {
 127         if (conn_ird > I40IW_MAX_IRD_SIZE)
 128                 conn_ird = I40IW_MAX_IRD_SIZE;
 129 
 130         if (conn_ord > I40IW_MAX_ORD_SIZE)
 131                 conn_ord = I40IW_MAX_ORD_SIZE;
 132         else if (!conn_ord && cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO)
 133                 conn_ord = 1;
 134 
 135         cm_node->ird_size = conn_ird;
 136         cm_node->ord_size = conn_ord;
 137 }
 138 
 139 /**
 140  * i40iw_copy_ip_ntohl - change network to host ip
 141  * @dst: host ip
 142  * @src: big endian
 143  */
 144 void i40iw_copy_ip_ntohl(u32 *dst, __be32 *src)
 145 {
 146         *dst++ = ntohl(*src++);
 147         *dst++ = ntohl(*src++);
 148         *dst++ = ntohl(*src++);
 149         *dst = ntohl(*src);
 150 }
 151 
 152 /**
 153  * i40iw_copy_ip_htonl - change host addr to network ip
 154  * @dst: host ip
 155  * @src: little endian
 156  */
 157 static inline void i40iw_copy_ip_htonl(__be32 *dst, u32 *src)
 158 {
 159         *dst++ = htonl(*src++);
 160         *dst++ = htonl(*src++);
 161         *dst++ = htonl(*src++);
 162         *dst = htonl(*src);
 163 }
 164 
 165 /**
 166  * i40iw_fill_sockaddr4 - get addr info for passive connection
 167  * @cm_node: connection's node
 168  * @event: upper layer's cm event
 169  */
 170 static inline void i40iw_fill_sockaddr4(struct i40iw_cm_node *cm_node,
 171                                         struct iw_cm_event *event)
 172 {
 173         struct sockaddr_in *laddr = (struct sockaddr_in *)&event->local_addr;
 174         struct sockaddr_in *raddr = (struct sockaddr_in *)&event->remote_addr;
 175 
 176         laddr->sin_family = AF_INET;
 177         raddr->sin_family = AF_INET;
 178 
 179         laddr->sin_port = htons(cm_node->loc_port);
 180         raddr->sin_port = htons(cm_node->rem_port);
 181 
 182         laddr->sin_addr.s_addr = htonl(cm_node->loc_addr[0]);
 183         raddr->sin_addr.s_addr = htonl(cm_node->rem_addr[0]);
 184 }
 185 
 186 /**
 187  * i40iw_fill_sockaddr6 - get ipv6 addr info for passive side
 188  * @cm_node: connection's node
 189  * @event: upper layer's cm event
 190  */
 191 static inline void i40iw_fill_sockaddr6(struct i40iw_cm_node *cm_node,
 192                                         struct iw_cm_event *event)
 193 {
 194         struct sockaddr_in6 *laddr6 = (struct sockaddr_in6 *)&event->local_addr;
 195         struct sockaddr_in6 *raddr6 = (struct sockaddr_in6 *)&event->remote_addr;
 196 
 197         laddr6->sin6_family = AF_INET6;
 198         raddr6->sin6_family = AF_INET6;
 199 
 200         laddr6->sin6_port = htons(cm_node->loc_port);
 201         raddr6->sin6_port = htons(cm_node->rem_port);
 202 
 203         i40iw_copy_ip_htonl(laddr6->sin6_addr.in6_u.u6_addr32,
 204                             cm_node->loc_addr);
 205         i40iw_copy_ip_htonl(raddr6->sin6_addr.in6_u.u6_addr32,
 206                             cm_node->rem_addr);
 207 }
 208 
 209 /**
 210  * i40iw_get_addr_info
 211  * @cm_node: contains ip/tcp info
 212  * @cm_info: to get a copy of the cm_node ip/tcp info
 213 */
 214 static void i40iw_get_addr_info(struct i40iw_cm_node *cm_node,
 215                                 struct i40iw_cm_info *cm_info)
 216 {
 217         cm_info->ipv4 = cm_node->ipv4;
 218         cm_info->vlan_id = cm_node->vlan_id;
 219         memcpy(cm_info->loc_addr, cm_node->loc_addr, sizeof(cm_info->loc_addr));
 220         memcpy(cm_info->rem_addr, cm_node->rem_addr, sizeof(cm_info->rem_addr));
 221         cm_info->loc_port = cm_node->loc_port;
 222         cm_info->rem_port = cm_node->rem_port;
 223         cm_info->user_pri = cm_node->user_pri;
 224 }
 225 
 226 /**
 227  * i40iw_get_cmevent_info - for cm event upcall
 228  * @cm_node: connection's node
 229  * @cm_id: upper layers cm struct for the event
 230  * @event: upper layer's cm event
 231  */
 232 static inline void i40iw_get_cmevent_info(struct i40iw_cm_node *cm_node,
 233                                           struct iw_cm_id *cm_id,
 234                                           struct iw_cm_event *event)
 235 {
 236         memcpy(&event->local_addr, &cm_id->m_local_addr,
 237                sizeof(event->local_addr));
 238         memcpy(&event->remote_addr, &cm_id->m_remote_addr,
 239                sizeof(event->remote_addr));
 240         if (cm_node) {
 241                 event->private_data = (void *)cm_node->pdata_buf;
 242                 event->private_data_len = (u8)cm_node->pdata.size;
 243                 event->ird = cm_node->ird_size;
 244                 event->ord = cm_node->ord_size;
 245         }
 246 }
 247 
 248 /**
 249  * i40iw_send_cm_event - upcall cm's event handler
 250  * @cm_node: connection's node
 251  * @cm_id: upper layer's cm info struct
 252  * @type: Event type to indicate
 253  * @status: status for the event type
 254  */
 255 static int i40iw_send_cm_event(struct i40iw_cm_node *cm_node,
 256                                struct iw_cm_id *cm_id,
 257                                enum iw_cm_event_type type,
 258                                int status)
 259 {
 260         struct iw_cm_event event;
 261 
 262         memset(&event, 0, sizeof(event));
 263         event.event = type;
 264         event.status = status;
 265         switch (type) {
 266         case IW_CM_EVENT_CONNECT_REQUEST:
 267                 if (cm_node->ipv4)
 268                         i40iw_fill_sockaddr4(cm_node, &event);
 269                 else
 270                         i40iw_fill_sockaddr6(cm_node, &event);
 271                 event.provider_data = (void *)cm_node;
 272                 event.private_data = (void *)cm_node->pdata_buf;
 273                 event.private_data_len = (u8)cm_node->pdata.size;
 274                 event.ird = cm_node->ird_size;
 275                 break;
 276         case IW_CM_EVENT_CONNECT_REPLY:
 277                 i40iw_get_cmevent_info(cm_node, cm_id, &event);
 278                 break;
 279         case IW_CM_EVENT_ESTABLISHED:
 280                 event.ird = cm_node->ird_size;
 281                 event.ord = cm_node->ord_size;
 282                 break;
 283         case IW_CM_EVENT_DISCONNECT:
 284                 break;
 285         case IW_CM_EVENT_CLOSE:
 286                 break;
 287         default:
 288                 i40iw_pr_err("event type received type = %d\n", type);
 289                 return -1;
 290         }
 291         return cm_id->event_handler(cm_id, &event);
 292 }
 293 
 294 /**
 295  * i40iw_create_event - create cm event
 296  * @cm_node: connection's node
 297  * @type: Event type to generate
 298  */
 299 static struct i40iw_cm_event *i40iw_create_event(struct i40iw_cm_node *cm_node,
 300                                                  enum i40iw_cm_event_type type)
 301 {
 302         struct i40iw_cm_event *event;
 303 
 304         if (!cm_node->cm_id)
 305                 return NULL;
 306 
 307         event = kzalloc(sizeof(*event), GFP_ATOMIC);
 308 
 309         if (!event)
 310                 return NULL;
 311 
 312         event->type = type;
 313         event->cm_node = cm_node;
 314         memcpy(event->cm_info.rem_addr, cm_node->rem_addr, sizeof(event->cm_info.rem_addr));
 315         memcpy(event->cm_info.loc_addr, cm_node->loc_addr, sizeof(event->cm_info.loc_addr));
 316         event->cm_info.rem_port = cm_node->rem_port;
 317         event->cm_info.loc_port = cm_node->loc_port;
 318         event->cm_info.cm_id = cm_node->cm_id;
 319 
 320         i40iw_debug(cm_node->dev,
 321                     I40IW_DEBUG_CM,
 322                     "node=%p event=%p type=%u dst=%pI4 src=%pI4\n",
 323                     cm_node,
 324                     event,
 325                     type,
 326                     event->cm_info.loc_addr,
 327                     event->cm_info.rem_addr);
 328 
 329         i40iw_cm_post_event(event);
 330         return event;
 331 }
 332 
 333 /**
 334  * i40iw_free_retrans_entry - free send entry
 335  * @cm_node: connection's node
 336  */
 337 static void i40iw_free_retrans_entry(struct i40iw_cm_node *cm_node)
 338 {
 339         struct i40iw_device *iwdev = cm_node->iwdev;
 340         struct i40iw_timer_entry *send_entry;
 341 
 342         send_entry = cm_node->send_entry;
 343         if (send_entry) {
 344                 cm_node->send_entry = NULL;
 345                 i40iw_free_sqbuf(&iwdev->vsi, (void *)send_entry->sqbuf);
 346                 kfree(send_entry);
 347                 atomic_dec(&cm_node->ref_count);
 348         }
 349 }
 350 
 351 /**
 352  * i40iw_cleanup_retrans_entry - free send entry with lock
 353  * @cm_node: connection's node
 354  */
 355 static void i40iw_cleanup_retrans_entry(struct i40iw_cm_node *cm_node)
 356 {
 357         unsigned long flags;
 358 
 359         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 360         i40iw_free_retrans_entry(cm_node);
 361         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 362 }
 363 
 364 /**
 365  * i40iw_form_cm_frame - get a free packet and build frame
 366  * @cm_node: connection's node ionfo to use in frame
 367  * @options: pointer to options info
 368  * @hdr: pointer mpa header
 369  * @pdata: pointer to private data
 370  * @flags:  indicates FIN or ACK
 371  */
 372 static struct i40iw_puda_buf *i40iw_form_cm_frame(struct i40iw_cm_node *cm_node,
 373                                                   struct i40iw_kmem_info *options,
 374                                                   struct i40iw_kmem_info *hdr,
 375                                                   struct i40iw_kmem_info *pdata,
 376                                                   u8 flags)
 377 {
 378         struct i40iw_puda_buf *sqbuf;
 379         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
 380         u8 *buf;
 381 
 382         struct tcphdr *tcph;
 383         struct iphdr *iph;
 384         struct ipv6hdr *ip6h;
 385         struct ethhdr *ethh;
 386         u16 packetsize;
 387         u16 eth_hlen = ETH_HLEN;
 388         u32 opts_len = 0;
 389         u32 pd_len = 0;
 390         u32 hdr_len = 0;
 391         u16 vtag;
 392 
 393         sqbuf = i40iw_puda_get_bufpool(vsi->ilq);
 394         if (!sqbuf)
 395                 return NULL;
 396         buf = sqbuf->mem.va;
 397 
 398         if (options)
 399                 opts_len = (u32)options->size;
 400 
 401         if (hdr)
 402                 hdr_len = hdr->size;
 403 
 404         if (pdata)
 405                 pd_len = pdata->size;
 406 
 407         if (cm_node->vlan_id <= VLAN_VID_MASK)
 408                 eth_hlen += 4;
 409 
 410         if (cm_node->ipv4)
 411                 packetsize = sizeof(*iph) + sizeof(*tcph);
 412         else
 413                 packetsize = sizeof(*ip6h) + sizeof(*tcph);
 414         packetsize += opts_len + hdr_len + pd_len;
 415 
 416         memset(buf, 0x00, eth_hlen + packetsize);
 417 
 418         sqbuf->totallen = packetsize + eth_hlen;
 419         sqbuf->maclen = eth_hlen;
 420         sqbuf->tcphlen = sizeof(*tcph) + opts_len;
 421         sqbuf->scratch = (void *)cm_node;
 422 
 423         ethh = (struct ethhdr *)buf;
 424         buf += eth_hlen;
 425 
 426         if (cm_node->ipv4) {
 427                 sqbuf->ipv4 = true;
 428 
 429                 iph = (struct iphdr *)buf;
 430                 buf += sizeof(*iph);
 431                 tcph = (struct tcphdr *)buf;
 432                 buf += sizeof(*tcph);
 433 
 434                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
 435                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
 436                 if (cm_node->vlan_id <= VLAN_VID_MASK) {
 437                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
 438                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
 439                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
 440 
 441                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IP);
 442                 } else {
 443                         ethh->h_proto = htons(ETH_P_IP);
 444                 }
 445 
 446                 iph->version = IPVERSION;
 447                 iph->ihl = 5;   /* 5 * 4Byte words, IP headr len */
 448                 iph->tos = cm_node->tos;
 449                 iph->tot_len = htons(packetsize);
 450                 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
 451 
 452                 iph->frag_off = htons(0x4000);
 453                 iph->ttl = 0x40;
 454                 iph->protocol = IPPROTO_TCP;
 455                 iph->saddr = htonl(cm_node->loc_addr[0]);
 456                 iph->daddr = htonl(cm_node->rem_addr[0]);
 457         } else {
 458                 sqbuf->ipv4 = false;
 459                 ip6h = (struct ipv6hdr *)buf;
 460                 buf += sizeof(*ip6h);
 461                 tcph = (struct tcphdr *)buf;
 462                 buf += sizeof(*tcph);
 463 
 464                 ether_addr_copy(ethh->h_dest, cm_node->rem_mac);
 465                 ether_addr_copy(ethh->h_source, cm_node->loc_mac);
 466                 if (cm_node->vlan_id <= VLAN_VID_MASK) {
 467                         ((struct vlan_ethhdr *)ethh)->h_vlan_proto = htons(ETH_P_8021Q);
 468                         vtag = (cm_node->user_pri << VLAN_PRIO_SHIFT) | cm_node->vlan_id;
 469                         ((struct vlan_ethhdr *)ethh)->h_vlan_TCI = htons(vtag);
 470                         ((struct vlan_ethhdr *)ethh)->h_vlan_encapsulated_proto = htons(ETH_P_IPV6);
 471                 } else {
 472                         ethh->h_proto = htons(ETH_P_IPV6);
 473                 }
 474                 ip6h->version = 6;
 475                 ip6h->priority = cm_node->tos >> 4;
 476                 ip6h->flow_lbl[0] = cm_node->tos << 4;
 477                 ip6h->flow_lbl[1] = 0;
 478                 ip6h->flow_lbl[2] = 0;
 479                 ip6h->payload_len = htons(packetsize - sizeof(*ip6h));
 480                 ip6h->nexthdr = 6;
 481                 ip6h->hop_limit = 128;
 482                 i40iw_copy_ip_htonl(ip6h->saddr.in6_u.u6_addr32,
 483                                     cm_node->loc_addr);
 484                 i40iw_copy_ip_htonl(ip6h->daddr.in6_u.u6_addr32,
 485                                     cm_node->rem_addr);
 486         }
 487 
 488         tcph->source = htons(cm_node->loc_port);
 489         tcph->dest = htons(cm_node->rem_port);
 490 
 491         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
 492 
 493         if (flags & SET_ACK) {
 494                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
 495                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
 496                 tcph->ack = 1;
 497         } else {
 498                 tcph->ack_seq = 0;
 499         }
 500 
 501         if (flags & SET_SYN) {
 502                 cm_node->tcp_cntxt.loc_seq_num++;
 503                 tcph->syn = 1;
 504         } else {
 505                 cm_node->tcp_cntxt.loc_seq_num += hdr_len + pd_len;
 506         }
 507 
 508         if (flags & SET_FIN) {
 509                 cm_node->tcp_cntxt.loc_seq_num++;
 510                 tcph->fin = 1;
 511         }
 512 
 513         if (flags & SET_RST)
 514                 tcph->rst = 1;
 515 
 516         tcph->doff = (u16)((sizeof(*tcph) + opts_len + 3) >> 2);
 517         sqbuf->tcphlen = tcph->doff << 2;
 518         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
 519         tcph->urg_ptr = 0;
 520 
 521         if (opts_len) {
 522                 memcpy(buf, options->addr, opts_len);
 523                 buf += opts_len;
 524         }
 525 
 526         if (hdr_len) {
 527                 memcpy(buf, hdr->addr, hdr_len);
 528                 buf += hdr_len;
 529         }
 530 
 531         if (pdata && pdata->addr)
 532                 memcpy(buf, pdata->addr, pdata->size);
 533 
 534         atomic_set(&sqbuf->refcount, 1);
 535 
 536         return sqbuf;
 537 }
 538 
 539 /**
 540  * i40iw_send_reset - Send RST packet
 541  * @cm_node: connection's node
 542  */
 543 int i40iw_send_reset(struct i40iw_cm_node *cm_node)
 544 {
 545         struct i40iw_puda_buf *sqbuf;
 546         int flags = SET_RST | SET_ACK;
 547 
 548         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, flags);
 549         if (!sqbuf) {
 550                 i40iw_pr_err("no sqbuf\n");
 551                 return -1;
 552         }
 553 
 554         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 0, 1);
 555 }
 556 
 557 /**
 558  * i40iw_active_open_err - send event for active side cm error
 559  * @cm_node: connection's node
 560  * @reset: Flag to send reset or not
 561  */
 562 static void i40iw_active_open_err(struct i40iw_cm_node *cm_node, bool reset)
 563 {
 564         i40iw_cleanup_retrans_entry(cm_node);
 565         cm_node->cm_core->stats_connect_errs++;
 566         if (reset) {
 567                 i40iw_debug(cm_node->dev,
 568                             I40IW_DEBUG_CM,
 569                             "%s cm_node=%p state=%d\n",
 570                             __func__,
 571                             cm_node,
 572                             cm_node->state);
 573                 atomic_inc(&cm_node->ref_count);
 574                 i40iw_send_reset(cm_node);
 575         }
 576 
 577         cm_node->state = I40IW_CM_STATE_CLOSED;
 578         i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
 579 }
 580 
 581 /**
 582  * i40iw_passive_open_err - handle passive side cm error
 583  * @cm_node: connection's node
 584  * @reset: send reset or just free cm_node
 585  */
 586 static void i40iw_passive_open_err(struct i40iw_cm_node *cm_node, bool reset)
 587 {
 588         i40iw_cleanup_retrans_entry(cm_node);
 589         cm_node->cm_core->stats_passive_errs++;
 590         cm_node->state = I40IW_CM_STATE_CLOSED;
 591         i40iw_debug(cm_node->dev,
 592                     I40IW_DEBUG_CM,
 593                     "%s cm_node=%p state =%d\n",
 594                     __func__,
 595                     cm_node,
 596                     cm_node->state);
 597         if (reset)
 598                 i40iw_send_reset(cm_node);
 599         else
 600                 i40iw_rem_ref_cm_node(cm_node);
 601 }
 602 
 603 /**
 604  * i40iw_event_connect_error - to create connect error event
 605  * @event: cm information for connect event
 606  */
 607 static void i40iw_event_connect_error(struct i40iw_cm_event *event)
 608 {
 609         struct i40iw_qp *iwqp;
 610         struct iw_cm_id *cm_id;
 611 
 612         cm_id = event->cm_node->cm_id;
 613         if (!cm_id)
 614                 return;
 615 
 616         iwqp = cm_id->provider_data;
 617 
 618         if (!iwqp || !iwqp->iwdev)
 619                 return;
 620 
 621         iwqp->cm_id = NULL;
 622         cm_id->provider_data = NULL;
 623         i40iw_send_cm_event(event->cm_node, cm_id,
 624                             IW_CM_EVENT_CONNECT_REPLY,
 625                             -ECONNRESET);
 626         cm_id->rem_ref(cm_id);
 627         i40iw_rem_ref_cm_node(event->cm_node);
 628 }
 629 
 630 /**
 631  * i40iw_process_options
 632  * @cm_node: connection's node
 633  * @optionsloc: point to start of options
 634  * @optionsize: size of all options
 635  * @syn_packet: flag if syn packet
 636  */
 637 static int i40iw_process_options(struct i40iw_cm_node *cm_node,
 638                                  u8 *optionsloc,
 639                                  u32 optionsize,
 640                                  u32 syn_packet)
 641 {
 642         u32 tmp;
 643         u32 offset = 0;
 644         union all_known_options *all_options;
 645         char got_mss_option = 0;
 646 
 647         while (offset < optionsize) {
 648                 all_options = (union all_known_options *)(optionsloc + offset);
 649                 switch (all_options->as_base.optionnum) {
 650                 case OPTION_NUMBER_END:
 651                         offset = optionsize;
 652                         break;
 653                 case OPTION_NUMBER_NONE:
 654                         offset += 1;
 655                         continue;
 656                 case OPTION_NUMBER_MSS:
 657                         i40iw_debug(cm_node->dev,
 658                                     I40IW_DEBUG_CM,
 659                                     "%s: MSS Length: %d Offset: %d Size: %d\n",
 660                                     __func__,
 661                                     all_options->as_mss.length,
 662                                     offset,
 663                                     optionsize);
 664                         got_mss_option = 1;
 665                         if (all_options->as_mss.length != 4)
 666                                 return -1;
 667                         tmp = ntohs(all_options->as_mss.mss);
 668                         if (tmp > 0 && tmp < cm_node->tcp_cntxt.mss)
 669                                 cm_node->tcp_cntxt.mss = tmp;
 670                         break;
 671                 case OPTION_NUMBER_WINDOW_SCALE:
 672                         cm_node->tcp_cntxt.snd_wscale =
 673                             all_options->as_windowscale.shiftcount;
 674                         break;
 675                 default:
 676                         i40iw_debug(cm_node->dev,
 677                                     I40IW_DEBUG_CM,
 678                                     "TCP Option not understood: %x\n",
 679                                     all_options->as_base.optionnum);
 680                         break;
 681                 }
 682                 offset += all_options->as_base.length;
 683         }
 684         if (!got_mss_option && syn_packet)
 685                 cm_node->tcp_cntxt.mss = I40IW_CM_DEFAULT_MSS;
 686         return 0;
 687 }
 688 
 689 /**
 690  * i40iw_handle_tcp_options -
 691  * @cm_node: connection's node
 692  * @tcph: pointer tcp header
 693  * @optionsize: size of options rcvd
 694  * @passive: active or passive flag
 695  */
 696 static int i40iw_handle_tcp_options(struct i40iw_cm_node *cm_node,
 697                                     struct tcphdr *tcph,
 698                                     int optionsize,
 699                                     int passive)
 700 {
 701         u8 *optionsloc = (u8 *)&tcph[1];
 702 
 703         if (optionsize) {
 704                 if (i40iw_process_options(cm_node,
 705                                           optionsloc,
 706                                           optionsize,
 707                                           (u32)tcph->syn)) {
 708                         i40iw_debug(cm_node->dev,
 709                                     I40IW_DEBUG_CM,
 710                                     "%s: Node %p, Sending RESET\n",
 711                                     __func__,
 712                                     cm_node);
 713                         if (passive)
 714                                 i40iw_passive_open_err(cm_node, true);
 715                         else
 716                                 i40iw_active_open_err(cm_node, true);
 717                         return -1;
 718                 }
 719         }
 720 
 721         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
 722             cm_node->tcp_cntxt.snd_wscale;
 723 
 724         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
 725                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
 726         return 0;
 727 }
 728 
 729 /**
 730  * i40iw_build_mpa_v1 - build a MPA V1 frame
 731  * @cm_node: connection's node
 732  * @mpa_key: to do read0 or write0
 733  */
 734 static void i40iw_build_mpa_v1(struct i40iw_cm_node *cm_node,
 735                                void *start_addr,
 736                                u8 mpa_key)
 737 {
 738         struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
 739 
 740         switch (mpa_key) {
 741         case MPA_KEY_REQUEST:
 742                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
 743                 break;
 744         case MPA_KEY_REPLY:
 745                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
 746                 break;
 747         default:
 748                 break;
 749         }
 750         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
 751         mpa_frame->rev = cm_node->mpa_frame_rev;
 752         mpa_frame->priv_data_len = htons(cm_node->pdata.size);
 753 }
 754 
 755 /**
 756  * i40iw_build_mpa_v2 - build a MPA V2 frame
 757  * @cm_node: connection's node
 758  * @start_addr: buffer start address
 759  * @mpa_key: to do read0 or write0
 760  */
 761 static void i40iw_build_mpa_v2(struct i40iw_cm_node *cm_node,
 762                                void *start_addr,
 763                                u8 mpa_key)
 764 {
 765         struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
 766         struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
 767         u16 ctrl_ird, ctrl_ord;
 768 
 769         /* initialize the upper 5 bytes of the frame */
 770         i40iw_build_mpa_v1(cm_node, start_addr, mpa_key);
 771         mpa_frame->flags |= IETF_MPA_V2_FLAG;
 772         mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
 773 
 774         /* initialize RTR msg */
 775         if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
 776                 ctrl_ird = IETF_NO_IRD_ORD;
 777                 ctrl_ord = IETF_NO_IRD_ORD;
 778         } else {
 779                 ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
 780                         IETF_NO_IRD_ORD : cm_node->ird_size;
 781                 ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
 782                         IETF_NO_IRD_ORD : cm_node->ord_size;
 783         }
 784 
 785         ctrl_ird |= IETF_PEER_TO_PEER;
 786 
 787         switch (mpa_key) {
 788         case MPA_KEY_REQUEST:
 789                 ctrl_ord |= IETF_RDMA0_WRITE;
 790                 ctrl_ord |= IETF_RDMA0_READ;
 791                 break;
 792         case MPA_KEY_REPLY:
 793                 switch (cm_node->send_rdma0_op) {
 794                 case SEND_RDMA_WRITE_ZERO:
 795                         ctrl_ord |= IETF_RDMA0_WRITE;
 796                         break;
 797                 case SEND_RDMA_READ_ZERO:
 798                         ctrl_ord |= IETF_RDMA0_READ;
 799                         break;
 800                 }
 801                 break;
 802         default:
 803                 break;
 804         }
 805         rtr_msg->ctrl_ird = htons(ctrl_ird);
 806         rtr_msg->ctrl_ord = htons(ctrl_ord);
 807 }
 808 
 809 /**
 810  * i40iw_cm_build_mpa_frame - build mpa frame for mpa version 1 or version 2
 811  * @cm_node: connection's node
 812  * @mpa: mpa: data buffer
 813  * @mpa_key: to do read0 or write0
 814  */
 815 static int i40iw_cm_build_mpa_frame(struct i40iw_cm_node *cm_node,
 816                                     struct i40iw_kmem_info *mpa,
 817                                     u8 mpa_key)
 818 {
 819         int hdr_len = 0;
 820 
 821         switch (cm_node->mpa_frame_rev) {
 822         case IETF_MPA_V1:
 823                 hdr_len = sizeof(struct ietf_mpa_v1);
 824                 i40iw_build_mpa_v1(cm_node, mpa->addr, mpa_key);
 825                 break;
 826         case IETF_MPA_V2:
 827                 hdr_len = sizeof(struct ietf_mpa_v2);
 828                 i40iw_build_mpa_v2(cm_node, mpa->addr, mpa_key);
 829                 break;
 830         default:
 831                 break;
 832         }
 833 
 834         return hdr_len;
 835 }
 836 
 837 /**
 838  * i40iw_send_mpa_request - active node send mpa request to passive node
 839  * @cm_node: connection's node
 840  */
 841 static int i40iw_send_mpa_request(struct i40iw_cm_node *cm_node)
 842 {
 843         struct i40iw_puda_buf *sqbuf;
 844 
 845         if (!cm_node) {
 846                 i40iw_pr_err("cm_node == NULL\n");
 847                 return -1;
 848         }
 849 
 850         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
 851         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
 852                                                          &cm_node->mpa_hdr,
 853                                                          MPA_KEY_REQUEST);
 854         if (!cm_node->mpa_hdr.size) {
 855                 i40iw_pr_err("mpa size = %d\n", cm_node->mpa_hdr.size);
 856                 return -1;
 857         }
 858 
 859         sqbuf = i40iw_form_cm_frame(cm_node,
 860                                     NULL,
 861                                     &cm_node->mpa_hdr,
 862                                     &cm_node->pdata,
 863                                     SET_ACK);
 864         if (!sqbuf) {
 865                 i40iw_pr_err("sq_buf == NULL\n");
 866                 return -1;
 867         }
 868         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
 869 }
 870 
 871 /**
 872  * i40iw_send_mpa_reject -
 873  * @cm_node: connection's node
 874  * @pdata: reject data for connection
 875  * @plen: length of reject data
 876  */
 877 static int i40iw_send_mpa_reject(struct i40iw_cm_node *cm_node,
 878                                  const void *pdata,
 879                                  u8 plen)
 880 {
 881         struct i40iw_puda_buf *sqbuf;
 882         struct i40iw_kmem_info priv_info;
 883 
 884         cm_node->mpa_hdr.addr = &cm_node->mpa_frame;
 885         cm_node->mpa_hdr.size = i40iw_cm_build_mpa_frame(cm_node,
 886                                                          &cm_node->mpa_hdr,
 887                                                          MPA_KEY_REPLY);
 888 
 889         cm_node->mpa_frame.flags |= IETF_MPA_FLAGS_REJECT;
 890         priv_info.addr = (void *)pdata;
 891         priv_info.size = plen;
 892 
 893         sqbuf = i40iw_form_cm_frame(cm_node,
 894                                     NULL,
 895                                     &cm_node->mpa_hdr,
 896                                     &priv_info,
 897                                     SET_ACK | SET_FIN);
 898         if (!sqbuf) {
 899                 i40iw_pr_err("no sqbuf\n");
 900                 return -ENOMEM;
 901         }
 902         cm_node->state = I40IW_CM_STATE_FIN_WAIT1;
 903         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
 904 }
 905 
 906 /**
 907  * recv_mpa - process an IETF MPA frame
 908  * @cm_node: connection's node
 909  * @buffer: Data pointer
 910  * @type: to return accept or reject
 911  * @len: Len of mpa buffer
 912  */
 913 static int i40iw_parse_mpa(struct i40iw_cm_node *cm_node, u8 *buffer, u32 *type, u32 len)
 914 {
 915         struct ietf_mpa_v1 *mpa_frame;
 916         struct ietf_mpa_v2 *mpa_v2_frame;
 917         struct ietf_rtr_msg *rtr_msg;
 918         int mpa_hdr_len;
 919         int priv_data_len;
 920 
 921         *type = I40IW_MPA_REQUEST_ACCEPT;
 922 
 923         if (len < sizeof(struct ietf_mpa_v1)) {
 924                 i40iw_pr_err("ietf buffer small (%x)\n", len);
 925                 return -1;
 926         }
 927 
 928         mpa_frame = (struct ietf_mpa_v1 *)buffer;
 929         mpa_hdr_len = sizeof(struct ietf_mpa_v1);
 930         priv_data_len = ntohs(mpa_frame->priv_data_len);
 931 
 932         if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
 933                 i40iw_pr_err("large pri_data %d\n", priv_data_len);
 934                 return -1;
 935         }
 936         if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
 937                 i40iw_pr_err("unsupported mpa rev = %d\n", mpa_frame->rev);
 938                 return -1;
 939         }
 940         if (mpa_frame->rev > cm_node->mpa_frame_rev) {
 941                 i40iw_pr_err("rev %d\n", mpa_frame->rev);
 942                 return -1;
 943         }
 944         cm_node->mpa_frame_rev = mpa_frame->rev;
 945 
 946         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
 947                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
 948                         i40iw_pr_err("Unexpected MPA Key received\n");
 949                         return -1;
 950                 }
 951         } else {
 952                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
 953                         i40iw_pr_err("Unexpected MPA Key received\n");
 954                         return -1;
 955                 }
 956         }
 957 
 958         if (priv_data_len + mpa_hdr_len > len) {
 959                 i40iw_pr_err("ietf buffer len(%x + %x != %x)\n",
 960                              priv_data_len, mpa_hdr_len, len);
 961                 return -1;
 962         }
 963         if (len > MAX_CM_BUFFER) {
 964                 i40iw_pr_err("ietf buffer large len = %d\n", len);
 965                 return -1;
 966         }
 967 
 968         switch (mpa_frame->rev) {
 969         case IETF_MPA_V2:{
 970                         u16 ird_size;
 971                         u16 ord_size;
 972                         u16 ctrl_ord;
 973                         u16 ctrl_ird;
 974 
 975                         mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
 976                         mpa_hdr_len += IETF_RTR_MSG_SIZE;
 977                         rtr_msg = &mpa_v2_frame->rtr_msg;
 978 
 979                         /* parse rtr message */
 980                         ctrl_ord = ntohs(rtr_msg->ctrl_ord);
 981                         ctrl_ird = ntohs(rtr_msg->ctrl_ird);
 982                         ird_size = ctrl_ird & IETF_NO_IRD_ORD;
 983                         ord_size = ctrl_ord & IETF_NO_IRD_ORD;
 984 
 985                         if (!(ctrl_ird & IETF_PEER_TO_PEER))
 986                                 return -1;
 987 
 988                         if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD) {
 989                                 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
 990                                 goto negotiate_done;
 991                         }
 992 
 993                         if (cm_node->state != I40IW_CM_STATE_MPAREQ_SENT) {
 994                                 /* responder */
 995                                 if (!ord_size && (ctrl_ord & IETF_RDMA0_READ))
 996                                         cm_node->ird_size = 1;
 997                                 if (cm_node->ord_size > ird_size)
 998                                         cm_node->ord_size = ird_size;
 999                         } else {
1000                                 /* initiator */
1001                                 if (!ird_size && (ctrl_ord & IETF_RDMA0_READ))
1002                                         return -1;
1003                                 if (cm_node->ord_size > ird_size)
1004                                         cm_node->ord_size = ird_size;
1005 
1006                                 if (cm_node->ird_size < ord_size)
1007                                         /* no resources available */
1008                                         return -1;
1009                         }
1010 
1011 negotiate_done:
1012                         if (ctrl_ord & IETF_RDMA0_READ)
1013                                 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1014                         else if (ctrl_ord & IETF_RDMA0_WRITE)
1015                                 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
1016                         else    /* Not supported RDMA0 operation */
1017                                 return -1;
1018                         i40iw_debug(cm_node->dev, I40IW_DEBUG_CM,
1019                                     "MPAV2: Negotiated ORD: %d, IRD: %d\n",
1020                                     cm_node->ord_size, cm_node->ird_size);
1021                         break;
1022                 }
1023                 break;
1024         case IETF_MPA_V1:
1025         default:
1026                 break;
1027         }
1028 
1029         memcpy(cm_node->pdata_buf, buffer + mpa_hdr_len, priv_data_len);
1030         cm_node->pdata.size = priv_data_len;
1031 
1032         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
1033                 *type = I40IW_MPA_REQUEST_REJECT;
1034 
1035         if (mpa_frame->flags & IETF_MPA_FLAGS_MARKERS)
1036                 cm_node->snd_mark_en = true;
1037 
1038         return 0;
1039 }
1040 
1041 /**
1042  * i40iw_schedule_cm_timer
1043  * @@cm_node: connection's node
1044  * @sqbuf: buffer to send
1045  * @type: if it is send or close
1046  * @send_retrans: if rexmits to be done
1047  * @close_when_complete: is cm_node to be removed
1048  *
1049  * note - cm_node needs to be protected before calling this. Encase in:
1050  *              i40iw_rem_ref_cm_node(cm_core, cm_node);
1051  *              i40iw_schedule_cm_timer(...)
1052  *              atomic_inc(&cm_node->ref_count);
1053  */
1054 int i40iw_schedule_cm_timer(struct i40iw_cm_node *cm_node,
1055                             struct i40iw_puda_buf *sqbuf,
1056                             enum i40iw_timer_type type,
1057                             int send_retrans,
1058                             int close_when_complete)
1059 {
1060         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1061         struct i40iw_cm_core *cm_core = cm_node->cm_core;
1062         struct i40iw_timer_entry *new_send;
1063         int ret = 0;
1064         u32 was_timer_set;
1065         unsigned long flags;
1066 
1067         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
1068         if (!new_send) {
1069                 if (type != I40IW_TIMER_TYPE_CLOSE)
1070                         i40iw_free_sqbuf(vsi, (void *)sqbuf);
1071                 return -ENOMEM;
1072         }
1073         new_send->retrycount = I40IW_DEFAULT_RETRYS;
1074         new_send->retranscount = I40IW_DEFAULT_RETRANS;
1075         new_send->sqbuf = sqbuf;
1076         new_send->timetosend = jiffies;
1077         new_send->type = type;
1078         new_send->send_retrans = send_retrans;
1079         new_send->close_when_complete = close_when_complete;
1080 
1081         if (type == I40IW_TIMER_TYPE_CLOSE) {
1082                 new_send->timetosend += (HZ / 10);
1083                 if (cm_node->close_entry) {
1084                         kfree(new_send);
1085                         i40iw_pr_err("already close entry\n");
1086                         return -EINVAL;
1087                 }
1088                 cm_node->close_entry = new_send;
1089         }
1090 
1091         if (type == I40IW_TIMER_TYPE_SEND) {
1092                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1093                 cm_node->send_entry = new_send;
1094                 atomic_inc(&cm_node->ref_count);
1095                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1096                 new_send->timetosend = jiffies + I40IW_RETRY_TIMEOUT;
1097 
1098                 atomic_inc(&sqbuf->refcount);
1099                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1100                 if (!send_retrans) {
1101                         i40iw_cleanup_retrans_entry(cm_node);
1102                         if (close_when_complete)
1103                                 i40iw_rem_ref_cm_node(cm_node);
1104                         return ret;
1105                 }
1106         }
1107 
1108         spin_lock_irqsave(&cm_core->ht_lock, flags);
1109         was_timer_set = timer_pending(&cm_core->tcp_timer);
1110 
1111         if (!was_timer_set) {
1112                 cm_core->tcp_timer.expires = new_send->timetosend;
1113                 add_timer(&cm_core->tcp_timer);
1114         }
1115         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1116 
1117         return ret;
1118 }
1119 
1120 /**
1121  * i40iw_retrans_expired - Could not rexmit the packet
1122  * @cm_node: connection's node
1123  */
1124 static void i40iw_retrans_expired(struct i40iw_cm_node *cm_node)
1125 {
1126         struct iw_cm_id *cm_id = cm_node->cm_id;
1127         enum i40iw_cm_node_state state = cm_node->state;
1128 
1129         cm_node->state = I40IW_CM_STATE_CLOSED;
1130         switch (state) {
1131         case I40IW_CM_STATE_SYN_RCVD:
1132         case I40IW_CM_STATE_CLOSING:
1133                 i40iw_rem_ref_cm_node(cm_node);
1134                 break;
1135         case I40IW_CM_STATE_FIN_WAIT1:
1136         case I40IW_CM_STATE_LAST_ACK:
1137                 if (cm_node->cm_id)
1138                         cm_id->rem_ref(cm_id);
1139                 i40iw_send_reset(cm_node);
1140                 break;
1141         default:
1142                 atomic_inc(&cm_node->ref_count);
1143                 i40iw_send_reset(cm_node);
1144                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
1145                 break;
1146         }
1147 }
1148 
1149 /**
1150  * i40iw_handle_close_entry - for handling retry/timeouts
1151  * @cm_node: connection's node
1152  * @rem_node: flag for remove cm_node
1153  */
1154 static void i40iw_handle_close_entry(struct i40iw_cm_node *cm_node, u32 rem_node)
1155 {
1156         struct i40iw_timer_entry *close_entry = cm_node->close_entry;
1157         struct iw_cm_id *cm_id = cm_node->cm_id;
1158         struct i40iw_qp *iwqp;
1159         unsigned long flags;
1160 
1161         if (!close_entry)
1162                 return;
1163         iwqp = (struct i40iw_qp *)close_entry->sqbuf;
1164         if (iwqp) {
1165                 spin_lock_irqsave(&iwqp->lock, flags);
1166                 if (iwqp->cm_id) {
1167                         iwqp->hw_tcp_state = I40IW_TCP_STATE_CLOSED;
1168                         iwqp->hw_iwarp_state = I40IW_QP_STATE_ERROR;
1169                         iwqp->last_aeq = I40IW_AE_RESET_SENT;
1170                         iwqp->ibqp_state = IB_QPS_ERR;
1171                         spin_unlock_irqrestore(&iwqp->lock, flags);
1172                         i40iw_cm_disconn(iwqp);
1173                 } else {
1174                         spin_unlock_irqrestore(&iwqp->lock, flags);
1175                 }
1176         } else if (rem_node) {
1177                 /* TIME_WAIT state */
1178                 i40iw_rem_ref_cm_node(cm_node);
1179         }
1180         if (cm_id)
1181                 cm_id->rem_ref(cm_id);
1182         kfree(close_entry);
1183         cm_node->close_entry = NULL;
1184 }
1185 
1186 /**
1187  * i40iw_build_timer_list - Add cm_nodes to timer list
1188  * @timer_list: ptr to timer list
1189  * @hte: ptr to accelerated or non-accelerated list
1190  */
1191 static void i40iw_build_timer_list(struct list_head *timer_list,
1192                                    struct list_head *hte)
1193 {
1194         struct i40iw_cm_node *cm_node;
1195         struct list_head *list_core_temp, *list_node;
1196 
1197         list_for_each_safe(list_node, list_core_temp, hte) {
1198                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
1199                 if (cm_node->close_entry || cm_node->send_entry) {
1200                         atomic_inc(&cm_node->ref_count);
1201                         list_add(&cm_node->timer_entry, timer_list);
1202                 }
1203         }
1204 }
1205 
1206 /**
1207  * i40iw_cm_timer_tick - system's timer expired callback
1208  * @pass: Pointing to cm_core
1209  */
1210 static void i40iw_cm_timer_tick(struct timer_list *t)
1211 {
1212         unsigned long nexttimeout = jiffies + I40IW_LONG_TIME;
1213         struct i40iw_cm_node *cm_node;
1214         struct i40iw_timer_entry *send_entry, *close_entry;
1215         struct list_head *list_core_temp;
1216         struct i40iw_sc_vsi *vsi;
1217         struct list_head *list_node;
1218         struct i40iw_cm_core *cm_core = from_timer(cm_core, t, tcp_timer);
1219         u32 settimer = 0;
1220         unsigned long timetosend;
1221         unsigned long flags;
1222 
1223         struct list_head timer_list;
1224 
1225         INIT_LIST_HEAD(&timer_list);
1226 
1227         spin_lock_irqsave(&cm_core->ht_lock, flags);
1228         i40iw_build_timer_list(&timer_list, &cm_core->non_accelerated_list);
1229         i40iw_build_timer_list(&timer_list, &cm_core->accelerated_list);
1230         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1231 
1232         list_for_each_safe(list_node, list_core_temp, &timer_list) {
1233                 cm_node = container_of(list_node,
1234                                        struct i40iw_cm_node,
1235                                        timer_entry);
1236                 close_entry = cm_node->close_entry;
1237 
1238                 if (close_entry) {
1239                         if (time_after(close_entry->timetosend, jiffies)) {
1240                                 if (nexttimeout > close_entry->timetosend ||
1241                                     !settimer) {
1242                                         nexttimeout = close_entry->timetosend;
1243                                         settimer = 1;
1244                                 }
1245                         } else {
1246                                 i40iw_handle_close_entry(cm_node, 1);
1247                         }
1248                 }
1249 
1250                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1251 
1252                 send_entry = cm_node->send_entry;
1253                 if (!send_entry)
1254                         goto done;
1255                 if (time_after(send_entry->timetosend, jiffies)) {
1256                         if (cm_node->state != I40IW_CM_STATE_OFFLOADED) {
1257                                 if ((nexttimeout > send_entry->timetosend) ||
1258                                     !settimer) {
1259                                         nexttimeout = send_entry->timetosend;
1260                                         settimer = 1;
1261                                 }
1262                         } else {
1263                                 i40iw_free_retrans_entry(cm_node);
1264                         }
1265                         goto done;
1266                 }
1267 
1268                 if ((cm_node->state == I40IW_CM_STATE_OFFLOADED) ||
1269                     (cm_node->state == I40IW_CM_STATE_CLOSED)) {
1270                         i40iw_free_retrans_entry(cm_node);
1271                         goto done;
1272                 }
1273 
1274                 if (!send_entry->retranscount || !send_entry->retrycount) {
1275                         i40iw_free_retrans_entry(cm_node);
1276 
1277                         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1278                         i40iw_retrans_expired(cm_node);
1279                         cm_node->state = I40IW_CM_STATE_CLOSED;
1280                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1281                         goto done;
1282                 }
1283                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1284 
1285                 vsi = &cm_node->iwdev->vsi;
1286 
1287                 if (!cm_node->ack_rcvd) {
1288                         atomic_inc(&send_entry->sqbuf->refcount);
1289                         i40iw_puda_send_buf(vsi->ilq, send_entry->sqbuf);
1290                         cm_node->cm_core->stats_pkt_retrans++;
1291                 }
1292                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1293                 if (send_entry->send_retrans) {
1294                         send_entry->retranscount--;
1295                         timetosend = (I40IW_RETRY_TIMEOUT <<
1296                                       (I40IW_DEFAULT_RETRANS -
1297                                        send_entry->retranscount));
1298 
1299                         send_entry->timetosend = jiffies +
1300                             min(timetosend, I40IW_MAX_TIMEOUT);
1301                         if (nexttimeout > send_entry->timetosend || !settimer) {
1302                                 nexttimeout = send_entry->timetosend;
1303                                 settimer = 1;
1304                         }
1305                 } else {
1306                         int close_when_complete;
1307 
1308                         close_when_complete = send_entry->close_when_complete;
1309                         i40iw_debug(cm_node->dev,
1310                                     I40IW_DEBUG_CM,
1311                                     "cm_node=%p state=%d\n",
1312                                     cm_node,
1313                                     cm_node->state);
1314                         i40iw_free_retrans_entry(cm_node);
1315                         if (close_when_complete)
1316                                 i40iw_rem_ref_cm_node(cm_node);
1317                 }
1318 done:
1319                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1320                 i40iw_rem_ref_cm_node(cm_node);
1321         }
1322 
1323         if (settimer) {
1324                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1325                 if (!timer_pending(&cm_core->tcp_timer)) {
1326                         cm_core->tcp_timer.expires = nexttimeout;
1327                         add_timer(&cm_core->tcp_timer);
1328                 }
1329                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1330         }
1331 }
1332 
1333 /**
1334  * i40iw_send_syn - send SYN packet
1335  * @cm_node: connection's node
1336  * @sendack: flag to set ACK bit or not
1337  */
1338 int i40iw_send_syn(struct i40iw_cm_node *cm_node, u32 sendack)
1339 {
1340         struct i40iw_puda_buf *sqbuf;
1341         int flags = SET_SYN;
1342         char optionsbuffer[sizeof(struct option_mss) +
1343                            sizeof(struct option_windowscale) +
1344                            sizeof(struct option_base) + TCP_OPTIONS_PADDING];
1345         struct i40iw_kmem_info opts;
1346 
1347         int optionssize = 0;
1348         /* Sending MSS option */
1349         union all_known_options *options;
1350 
1351         opts.addr = optionsbuffer;
1352         if (!cm_node) {
1353                 i40iw_pr_err("no cm_node\n");
1354                 return -EINVAL;
1355         }
1356 
1357         options = (union all_known_options *)&optionsbuffer[optionssize];
1358         options->as_mss.optionnum = OPTION_NUMBER_MSS;
1359         options->as_mss.length = sizeof(struct option_mss);
1360         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1361         optionssize += sizeof(struct option_mss);
1362 
1363         options = (union all_known_options *)&optionsbuffer[optionssize];
1364         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1365         options->as_windowscale.length = sizeof(struct option_windowscale);
1366         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1367         optionssize += sizeof(struct option_windowscale);
1368         options = (union all_known_options *)&optionsbuffer[optionssize];
1369         options->as_end = OPTION_NUMBER_END;
1370         optionssize += 1;
1371 
1372         if (sendack)
1373                 flags |= SET_ACK;
1374 
1375         opts.size = optionssize;
1376 
1377         sqbuf = i40iw_form_cm_frame(cm_node, &opts, NULL, NULL, flags);
1378         if (!sqbuf) {
1379                 i40iw_pr_err("no sqbuf\n");
1380                 return -1;
1381         }
1382         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1383 }
1384 
1385 /**
1386  * i40iw_send_ack - Send ACK packet
1387  * @cm_node: connection's node
1388  */
1389 static void i40iw_send_ack(struct i40iw_cm_node *cm_node)
1390 {
1391         struct i40iw_puda_buf *sqbuf;
1392         struct i40iw_sc_vsi *vsi = &cm_node->iwdev->vsi;
1393 
1394         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK);
1395         if (sqbuf)
1396                 i40iw_puda_send_buf(vsi->ilq, sqbuf);
1397         else
1398                 i40iw_pr_err("no sqbuf\n");
1399 }
1400 
1401 /**
1402  * i40iw_send_fin - Send FIN pkt
1403  * @cm_node: connection's node
1404  */
1405 static int i40iw_send_fin(struct i40iw_cm_node *cm_node)
1406 {
1407         struct i40iw_puda_buf *sqbuf;
1408 
1409         sqbuf = i40iw_form_cm_frame(cm_node, NULL, NULL, NULL, SET_ACK | SET_FIN);
1410         if (!sqbuf) {
1411                 i40iw_pr_err("no sqbuf\n");
1412                 return -1;
1413         }
1414         return i40iw_schedule_cm_timer(cm_node, sqbuf, I40IW_TIMER_TYPE_SEND, 1, 0);
1415 }
1416 
1417 /**
1418  * i40iw_find_node - find a cm node that matches the reference cm node
1419  * @cm_core: cm's core
1420  * @rem_port: remote tcp port num
1421  * @rem_addr: remote ip addr
1422  * @loc_port: local tcp port num
1423  * @loc_addr: loc ip addr
1424  * @add_refcnt: flag to increment refcount of cm_node
1425  * @accelerated_list: flag for accelerated vs non-accelerated list to search
1426  */
1427 struct i40iw_cm_node *i40iw_find_node(struct i40iw_cm_core *cm_core,
1428                                       u16 rem_port,
1429                                       u32 *rem_addr,
1430                                       u16 loc_port,
1431                                       u32 *loc_addr,
1432                                       bool add_refcnt,
1433                                       bool accelerated_list)
1434 {
1435         struct list_head *hte;
1436         struct i40iw_cm_node *cm_node;
1437         unsigned long flags;
1438 
1439         hte = accelerated_list ?
1440               &cm_core->accelerated_list : &cm_core->non_accelerated_list;
1441 
1442         /* walk list and find cm_node associated with this session ID */
1443         spin_lock_irqsave(&cm_core->ht_lock, flags);
1444         list_for_each_entry(cm_node, hte, list) {
1445                 if (!memcmp(cm_node->loc_addr, loc_addr, sizeof(cm_node->loc_addr)) &&
1446                     (cm_node->loc_port == loc_port) &&
1447                     !memcmp(cm_node->rem_addr, rem_addr, sizeof(cm_node->rem_addr)) &&
1448                     (cm_node->rem_port == rem_port)) {
1449                         if (add_refcnt)
1450                                 atomic_inc(&cm_node->ref_count);
1451                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1452                         return cm_node;
1453                 }
1454         }
1455         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1456 
1457         /* no owner node */
1458         return NULL;
1459 }
1460 
1461 /**
1462  * i40iw_find_listener - find a cm node listening on this addr-port pair
1463  * @cm_core: cm's core
1464  * @dst_port: listener tcp port num
1465  * @dst_addr: listener ip addr
1466  * @listener_state: state to match with listen node's
1467  */
1468 static struct i40iw_cm_listener *i40iw_find_listener(
1469                                                      struct i40iw_cm_core *cm_core,
1470                                                      u32 *dst_addr,
1471                                                      u16 dst_port,
1472                                                      u16 vlan_id,
1473                                                      enum i40iw_cm_listener_state
1474                                                      listener_state)
1475 {
1476         struct i40iw_cm_listener *listen_node;
1477         static const u32 ip_zero[4] = { 0, 0, 0, 0 };
1478         u32 listen_addr[4];
1479         u16 listen_port;
1480         unsigned long flags;
1481 
1482         /* walk list and find cm_node associated with this session ID */
1483         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1484         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1485                 memcpy(listen_addr, listen_node->loc_addr, sizeof(listen_addr));
1486                 listen_port = listen_node->loc_port;
1487                 /* compare node pair, return node handle if a match */
1488                 if ((!memcmp(listen_addr, dst_addr, sizeof(listen_addr)) ||
1489                      !memcmp(listen_addr, ip_zero, sizeof(listen_addr))) &&
1490                      (listen_port == dst_port) &&
1491                      (listener_state & listen_node->listener_state)) {
1492                         atomic_inc(&listen_node->ref_count);
1493                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1494                         return listen_node;
1495                 }
1496         }
1497         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1498         return NULL;
1499 }
1500 
1501 /**
1502  * i40iw_add_hte_node - add a cm node to the hash table
1503  * @cm_core: cm's core
1504  * @cm_node: connection's node
1505  */
1506 static void i40iw_add_hte_node(struct i40iw_cm_core *cm_core,
1507                                struct i40iw_cm_node *cm_node)
1508 {
1509         unsigned long flags;
1510 
1511         if (!cm_node || !cm_core) {
1512                 i40iw_pr_err("cm_node or cm_core == NULL\n");
1513                 return;
1514         }
1515 
1516         spin_lock_irqsave(&cm_core->ht_lock, flags);
1517         list_add_tail(&cm_node->list, &cm_core->non_accelerated_list);
1518         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1519 }
1520 
1521 /**
1522  * i40iw_find_port - find port that matches reference port
1523  * @hte: ptr to accelerated or non-accelerated list
1524  * @accelerated_list: flag for accelerated vs non-accelerated list
1525  */
1526 static bool i40iw_find_port(struct list_head *hte, u16 port)
1527 {
1528         struct i40iw_cm_node *cm_node;
1529 
1530         list_for_each_entry(cm_node, hte, list) {
1531                 if (cm_node->loc_port == port)
1532                         return true;
1533         }
1534         return false;
1535 }
1536 
1537 /**
1538  * i40iw_port_in_use - determine if port is in use
1539  * @cm_core: cm's core
1540  * @port: port number
1541  */
1542 bool i40iw_port_in_use(struct i40iw_cm_core *cm_core, u16 port)
1543 {
1544         struct i40iw_cm_listener *listen_node;
1545         unsigned long flags;
1546 
1547         spin_lock_irqsave(&cm_core->ht_lock, flags);
1548         if (i40iw_find_port(&cm_core->accelerated_list, port) ||
1549             i40iw_find_port(&cm_core->non_accelerated_list, port)) {
1550                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1551                 return true;
1552         }
1553         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1554 
1555         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1556         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
1557                 if (listen_node->loc_port == port) {
1558                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1559                         return true;
1560                 }
1561         }
1562         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1563 
1564         return false;
1565 }
1566 
1567 /**
1568  * i40iw_del_multiple_qhash - Remove qhash and child listens
1569  * @iwdev: iWarp device
1570  * @cm_info: CM info for parent listen node
1571  * @cm_parent_listen_node: The parent listen node
1572  */
1573 static enum i40iw_status_code i40iw_del_multiple_qhash(
1574                                                        struct i40iw_device *iwdev,
1575                                                        struct i40iw_cm_info *cm_info,
1576                                                        struct i40iw_cm_listener *cm_parent_listen_node)
1577 {
1578         struct i40iw_cm_listener *child_listen_node;
1579         enum i40iw_status_code ret = I40IW_ERR_CONFIG;
1580         struct list_head *pos, *tpos;
1581         unsigned long flags;
1582 
1583         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1584         list_for_each_safe(pos, tpos, &cm_parent_listen_node->child_listen_list) {
1585                 child_listen_node = list_entry(pos, struct i40iw_cm_listener, child_listen_list);
1586                 if (child_listen_node->ipv4)
1587                         i40iw_debug(&iwdev->sc_dev,
1588                                     I40IW_DEBUG_CM,
1589                                     "removing child listen for IP=%pI4, port=%d, vlan=%d\n",
1590                                     child_listen_node->loc_addr,
1591                                     child_listen_node->loc_port,
1592                                     child_listen_node->vlan_id);
1593                 else
1594                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
1595                                     "removing child listen for IP=%pI6, port=%d, vlan=%d\n",
1596                                     child_listen_node->loc_addr,
1597                                     child_listen_node->loc_port,
1598                                     child_listen_node->vlan_id);
1599                 list_del(pos);
1600                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1601                        sizeof(cm_info->loc_addr));
1602                 cm_info->vlan_id = child_listen_node->vlan_id;
1603                 if (child_listen_node->qhash_set) {
1604                         ret = i40iw_manage_qhash(iwdev, cm_info,
1605                                                  I40IW_QHASH_TYPE_TCP_SYN,
1606                                                  I40IW_QHASH_MANAGE_TYPE_DELETE,
1607                                                  NULL, false);
1608                         child_listen_node->qhash_set = false;
1609                 } else {
1610                         ret = I40IW_SUCCESS;
1611                 }
1612                 i40iw_debug(&iwdev->sc_dev,
1613                             I40IW_DEBUG_CM,
1614                             "freed pointer = %p\n",
1615                             child_listen_node);
1616                 kfree(child_listen_node);
1617                 cm_parent_listen_node->cm_core->stats_listen_nodes_destroyed++;
1618         }
1619         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1620 
1621         return ret;
1622 }
1623 
1624 /**
1625  * i40iw_netdev_vlan_ipv6 - Gets the netdev and vlan
1626  * @addr: local IPv6 address
1627  * @vlan_id: vlan id for the given IPv6 address
1628  *
1629  * Returns the net_device of the IPv6 address and also sets the
1630  * vlan id for that address.
1631  */
1632 static struct net_device *i40iw_netdev_vlan_ipv6(u32 *addr, u16 *vlan_id)
1633 {
1634         struct net_device *ip_dev = NULL;
1635         struct in6_addr laddr6;
1636 
1637         if (!IS_ENABLED(CONFIG_IPV6))
1638                 return NULL;
1639         i40iw_copy_ip_htonl(laddr6.in6_u.u6_addr32, addr);
1640         if (vlan_id)
1641                 *vlan_id = I40IW_NO_VLAN;
1642         rcu_read_lock();
1643         for_each_netdev_rcu(&init_net, ip_dev) {
1644                 if (ipv6_chk_addr(&init_net, &laddr6, ip_dev, 1)) {
1645                         if (vlan_id)
1646                                 *vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1647                         break;
1648                 }
1649         }
1650         rcu_read_unlock();
1651         return ip_dev;
1652 }
1653 
1654 /**
1655  * i40iw_get_vlan_ipv4 - Returns the vlan_id for IPv4 address
1656  * @addr: local IPv4 address
1657  */
1658 static u16 i40iw_get_vlan_ipv4(u32 *addr)
1659 {
1660         struct net_device *netdev;
1661         u16 vlan_id = I40IW_NO_VLAN;
1662 
1663         netdev = ip_dev_find(&init_net, htonl(addr[0]));
1664         if (netdev) {
1665                 vlan_id = rdma_vlan_dev_vlan_id(netdev);
1666                 dev_put(netdev);
1667         }
1668         return vlan_id;
1669 }
1670 
1671 /**
1672  * i40iw_add_mqh_6 - Adds multiple qhashes for IPv6
1673  * @iwdev: iWarp device
1674  * @cm_info: CM info for parent listen node
1675  * @cm_parent_listen_node: The parent listen node
1676  *
1677  * Adds a qhash and a child listen node for every IPv6 address
1678  * on the adapter and adds the associated qhash filter
1679  */
1680 static enum i40iw_status_code i40iw_add_mqh_6(struct i40iw_device *iwdev,
1681                                               struct i40iw_cm_info *cm_info,
1682                                               struct i40iw_cm_listener *cm_parent_listen_node)
1683 {
1684         struct net_device *ip_dev;
1685         struct inet6_dev *idev;
1686         struct inet6_ifaddr *ifp, *tmp;
1687         enum i40iw_status_code ret = 0;
1688         struct i40iw_cm_listener *child_listen_node;
1689         unsigned long flags;
1690 
1691         rtnl_lock();
1692         for_each_netdev(&init_net, ip_dev) {
1693                 if ((((rdma_vlan_dev_vlan_id(ip_dev) < I40IW_NO_VLAN) &&
1694                       (rdma_vlan_dev_real_dev(ip_dev) == iwdev->netdev)) ||
1695                      (ip_dev == iwdev->netdev)) && (ip_dev->flags & IFF_UP)) {
1696                         idev = __in6_dev_get(ip_dev);
1697                         if (!idev) {
1698                                 i40iw_pr_err("idev == NULL\n");
1699                                 break;
1700                         }
1701                         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
1702                                 i40iw_debug(&iwdev->sc_dev,
1703                                             I40IW_DEBUG_CM,
1704                                             "IP=%pI6, vlan_id=%d, MAC=%pM\n",
1705                                             &ifp->addr,
1706                                             rdma_vlan_dev_vlan_id(ip_dev),
1707                                             ip_dev->dev_addr);
1708                                 child_listen_node =
1709                                         kzalloc(sizeof(*child_listen_node), GFP_ATOMIC);
1710                                 i40iw_debug(&iwdev->sc_dev,
1711                                             I40IW_DEBUG_CM,
1712                                             "Allocating child listener %p\n",
1713                                             child_listen_node);
1714                                 if (!child_listen_node) {
1715                                         ret = I40IW_ERR_NO_MEMORY;
1716                                         goto exit;
1717                                 }
1718                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(ip_dev);
1719                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1720 
1721                                 memcpy(child_listen_node, cm_parent_listen_node,
1722                                        sizeof(*child_listen_node));
1723 
1724                                 i40iw_copy_ip_ntohl(child_listen_node->loc_addr,
1725                                                     ifp->addr.in6_u.u6_addr32);
1726                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1727                                        sizeof(cm_info->loc_addr));
1728 
1729                                 ret = i40iw_manage_qhash(iwdev, cm_info,
1730                                                          I40IW_QHASH_TYPE_TCP_SYN,
1731                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1732                                                          NULL, true);
1733                                 if (!ret) {
1734                                         child_listen_node->qhash_set = true;
1735                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1736                                         list_add(&child_listen_node->child_listen_list,
1737                                                  &cm_parent_listen_node->child_listen_list);
1738                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1739                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1740                                 } else {
1741                                         kfree(child_listen_node);
1742                                 }
1743                         }
1744                 }
1745         }
1746 exit:
1747         rtnl_unlock();
1748         return ret;
1749 }
1750 
1751 /**
1752  * i40iw_add_mqh_4 - Adds multiple qhashes for IPv4
1753  * @iwdev: iWarp device
1754  * @cm_info: CM info for parent listen node
1755  * @cm_parent_listen_node: The parent listen node
1756  *
1757  * Adds a qhash and a child listen node for every IPv4 address
1758  * on the adapter and adds the associated qhash filter
1759  */
1760 static enum i40iw_status_code i40iw_add_mqh_4(
1761                                 struct i40iw_device *iwdev,
1762                                 struct i40iw_cm_info *cm_info,
1763                                 struct i40iw_cm_listener *cm_parent_listen_node)
1764 {
1765         struct net_device *dev;
1766         struct in_device *idev;
1767         struct i40iw_cm_listener *child_listen_node;
1768         enum i40iw_status_code ret = 0;
1769         unsigned long flags;
1770 
1771         rtnl_lock();
1772         for_each_netdev(&init_net, dev) {
1773                 if ((((rdma_vlan_dev_vlan_id(dev) < I40IW_NO_VLAN) &&
1774                       (rdma_vlan_dev_real_dev(dev) == iwdev->netdev)) ||
1775                     (dev == iwdev->netdev)) && (dev->flags & IFF_UP)) {
1776                         const struct in_ifaddr *ifa;
1777 
1778                         idev = in_dev_get(dev);
1779 
1780                         in_dev_for_each_ifa_rtnl(ifa, idev) {
1781                                 i40iw_debug(&iwdev->sc_dev,
1782                                             I40IW_DEBUG_CM,
1783                                             "Allocating child CM Listener forIP=%pI4, vlan_id=%d, MAC=%pM\n",
1784                                             &ifa->ifa_address,
1785                                             rdma_vlan_dev_vlan_id(dev),
1786                                             dev->dev_addr);
1787                                 child_listen_node = kzalloc(sizeof(*child_listen_node), GFP_KERNEL);
1788                                 cm_parent_listen_node->cm_core->stats_listen_nodes_created++;
1789                                 i40iw_debug(&iwdev->sc_dev,
1790                                             I40IW_DEBUG_CM,
1791                                             "Allocating child listener %p\n",
1792                                             child_listen_node);
1793                                 if (!child_listen_node) {
1794                                         in_dev_put(idev);
1795                                         ret = I40IW_ERR_NO_MEMORY;
1796                                         goto exit;
1797                                 }
1798                                 cm_info->vlan_id = rdma_vlan_dev_vlan_id(dev);
1799                                 cm_parent_listen_node->vlan_id = cm_info->vlan_id;
1800                                 memcpy(child_listen_node,
1801                                        cm_parent_listen_node,
1802                                        sizeof(*child_listen_node));
1803 
1804                                 child_listen_node->loc_addr[0] = ntohl(ifa->ifa_address);
1805                                 memcpy(cm_info->loc_addr, child_listen_node->loc_addr,
1806                                        sizeof(cm_info->loc_addr));
1807 
1808                                 ret = i40iw_manage_qhash(iwdev,
1809                                                          cm_info,
1810                                                          I40IW_QHASH_TYPE_TCP_SYN,
1811                                                          I40IW_QHASH_MANAGE_TYPE_ADD,
1812                                                          NULL,
1813                                                          true);
1814                                 if (!ret) {
1815                                         child_listen_node->qhash_set = true;
1816                                         spin_lock_irqsave(&iwdev->cm_core.listen_list_lock, flags);
1817                                         list_add(&child_listen_node->child_listen_list,
1818                                                  &cm_parent_listen_node->child_listen_list);
1819                                         spin_unlock_irqrestore(&iwdev->cm_core.listen_list_lock, flags);
1820                                 } else {
1821                                         kfree(child_listen_node);
1822                                         cm_parent_listen_node->cm_core->stats_listen_nodes_created--;
1823                                 }
1824                         }
1825 
1826                         in_dev_put(idev);
1827                 }
1828         }
1829 exit:
1830         rtnl_unlock();
1831         return ret;
1832 }
1833 
1834 /**
1835  * i40iw_dec_refcnt_listen - delete listener and associated cm nodes
1836  * @cm_core: cm's core
1837  * @free_hanging_nodes: to free associated cm_nodes
1838  * @apbvt_del: flag to delete the apbvt
1839  */
1840 static int i40iw_dec_refcnt_listen(struct i40iw_cm_core *cm_core,
1841                                    struct i40iw_cm_listener *listener,
1842                                    int free_hanging_nodes, bool apbvt_del)
1843 {
1844         int ret = -EINVAL;
1845         int err = 0;
1846         struct list_head *list_pos;
1847         struct list_head *list_temp;
1848         struct i40iw_cm_node *cm_node;
1849         struct list_head reset_list;
1850         struct i40iw_cm_info nfo;
1851         struct i40iw_cm_node *loopback;
1852         enum i40iw_cm_node_state old_state;
1853         unsigned long flags;
1854 
1855         /* free non-accelerated child nodes for this listener */
1856         INIT_LIST_HEAD(&reset_list);
1857         if (free_hanging_nodes) {
1858                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1859                 list_for_each_safe(list_pos,
1860                                    list_temp, &cm_core->non_accelerated_list) {
1861                         cm_node = container_of(list_pos, struct i40iw_cm_node, list);
1862                         if ((cm_node->listener == listener) &&
1863                             !cm_node->accelerated) {
1864                                 atomic_inc(&cm_node->ref_count);
1865                                 list_add(&cm_node->reset_entry, &reset_list);
1866                         }
1867                 }
1868                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1869         }
1870 
1871         list_for_each_safe(list_pos, list_temp, &reset_list) {
1872                 cm_node = container_of(list_pos, struct i40iw_cm_node, reset_entry);
1873                 loopback = cm_node->loopbackpartner;
1874                 if (cm_node->state >= I40IW_CM_STATE_FIN_WAIT1) {
1875                         i40iw_rem_ref_cm_node(cm_node);
1876                 } else {
1877                         if (!loopback) {
1878                                 i40iw_cleanup_retrans_entry(cm_node);
1879                                 err = i40iw_send_reset(cm_node);
1880                                 if (err) {
1881                                         cm_node->state = I40IW_CM_STATE_CLOSED;
1882                                         i40iw_pr_err("send reset\n");
1883                                 } else {
1884                                         old_state = cm_node->state;
1885                                         cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1886                                         if (old_state != I40IW_CM_STATE_MPAREQ_RCVD)
1887                                                 i40iw_rem_ref_cm_node(cm_node);
1888                                 }
1889                         } else {
1890                                 struct i40iw_cm_event event;
1891 
1892                                 event.cm_node = loopback;
1893                                 memcpy(event.cm_info.rem_addr,
1894                                        loopback->rem_addr, sizeof(event.cm_info.rem_addr));
1895                                 memcpy(event.cm_info.loc_addr,
1896                                        loopback->loc_addr, sizeof(event.cm_info.loc_addr));
1897                                 event.cm_info.rem_port = loopback->rem_port;
1898                                 event.cm_info.loc_port = loopback->loc_port;
1899                                 event.cm_info.cm_id = loopback->cm_id;
1900                                 event.cm_info.ipv4 = loopback->ipv4;
1901                                 atomic_inc(&loopback->ref_count);
1902                                 loopback->state = I40IW_CM_STATE_CLOSED;
1903                                 i40iw_event_connect_error(&event);
1904                                 cm_node->state = I40IW_CM_STATE_LISTENER_DESTROYED;
1905                                 i40iw_rem_ref_cm_node(cm_node);
1906                         }
1907                 }
1908         }
1909 
1910         if (!atomic_dec_return(&listener->ref_count)) {
1911                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1912                 list_del(&listener->list);
1913                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1914 
1915                 if (listener->iwdev) {
1916                         if (apbvt_del)
1917                                 i40iw_manage_apbvt(listener->iwdev,
1918                                                    listener->loc_port,
1919                                                    I40IW_MANAGE_APBVT_DEL);
1920 
1921                         memcpy(nfo.loc_addr, listener->loc_addr, sizeof(nfo.loc_addr));
1922                         nfo.loc_port = listener->loc_port;
1923                         nfo.ipv4 = listener->ipv4;
1924                         nfo.vlan_id = listener->vlan_id;
1925                         nfo.user_pri = listener->user_pri;
1926 
1927                         if (!list_empty(&listener->child_listen_list)) {
1928                                 i40iw_del_multiple_qhash(listener->iwdev, &nfo, listener);
1929                         } else {
1930                                 if (listener->qhash_set)
1931                                         i40iw_manage_qhash(listener->iwdev,
1932                                                            &nfo,
1933                                                            I40IW_QHASH_TYPE_TCP_SYN,
1934                                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
1935                                                            NULL,
1936                                                            false);
1937                         }
1938                 }
1939 
1940                 cm_core->stats_listen_destroyed++;
1941                 kfree(listener);
1942                 cm_core->stats_listen_nodes_destroyed++;
1943                 listener = NULL;
1944                 ret = 0;
1945         }
1946 
1947         if (listener) {
1948                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1949                         i40iw_debug(cm_core->dev,
1950                                     I40IW_DEBUG_CM,
1951                                     "%s: listener (%p) pending accepts=%u\n",
1952                                     __func__,
1953                                     listener,
1954                                     atomic_read(&listener->pend_accepts_cnt));
1955         }
1956 
1957         return ret;
1958 }
1959 
1960 /**
1961  * i40iw_cm_del_listen - delete a linstener
1962  * @cm_core: cm's core
1963   * @listener: passive connection's listener
1964  * @apbvt_del: flag to delete apbvt
1965  */
1966 static int i40iw_cm_del_listen(struct i40iw_cm_core *cm_core,
1967                                struct i40iw_cm_listener *listener,
1968                                bool apbvt_del)
1969 {
1970         listener->listener_state = I40IW_CM_LISTENER_PASSIVE_STATE;
1971         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1972         return i40iw_dec_refcnt_listen(cm_core, listener, 1, apbvt_del);
1973 }
1974 
1975 /**
1976  * i40iw_addr_resolve_neigh - resolve neighbor address
1977  * @iwdev: iwarp device structure
1978  * @src_ip: local ip address
1979  * @dst_ip: remote ip address
1980  * @arpindex: if there is an arp entry
1981  */
1982 static int i40iw_addr_resolve_neigh(struct i40iw_device *iwdev,
1983                                     u32 src_ip,
1984                                     u32 dst_ip,
1985                                     int arpindex)
1986 {
1987         struct rtable *rt;
1988         struct neighbour *neigh;
1989         int rc = arpindex;
1990         __be32 dst_ipaddr = htonl(dst_ip);
1991         __be32 src_ipaddr = htonl(src_ip);
1992 
1993         rt = ip_route_output(&init_net, dst_ipaddr, src_ipaddr, 0, 0);
1994         if (IS_ERR(rt)) {
1995                 i40iw_pr_err("ip_route_output\n");
1996                 return rc;
1997         }
1998 
1999         neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
2000 
2001         rcu_read_lock();
2002         if (neigh) {
2003                 if (neigh->nud_state & NUD_VALID) {
2004                         if (arpindex >= 0) {
2005                                 if (ether_addr_equal(iwdev->arp_table[arpindex].mac_addr,
2006                                                      neigh->ha))
2007                                         /* Mac address same as arp table */
2008                                         goto resolve_neigh_exit;
2009                                 i40iw_manage_arp_cache(iwdev,
2010                                                        iwdev->arp_table[arpindex].mac_addr,
2011                                                        &dst_ip,
2012                                                        true,
2013                                                        I40IW_ARP_DELETE);
2014                         }
2015 
2016                         i40iw_manage_arp_cache(iwdev, neigh->ha, &dst_ip, true, I40IW_ARP_ADD);
2017                         rc = i40iw_arp_table(iwdev, &dst_ip, true, NULL, I40IW_ARP_RESOLVE);
2018                 } else {
2019                         neigh_event_send(neigh, NULL);
2020                 }
2021         }
2022  resolve_neigh_exit:
2023 
2024         rcu_read_unlock();
2025         if (neigh)
2026                 neigh_release(neigh);
2027 
2028         ip_rt_put(rt);
2029         return rc;
2030 }
2031 
2032 /**
2033  * i40iw_get_dst_ipv6
2034  */
2035 static struct dst_entry *i40iw_get_dst_ipv6(struct sockaddr_in6 *src_addr,
2036                                             struct sockaddr_in6 *dst_addr)
2037 {
2038         struct dst_entry *dst;
2039         struct flowi6 fl6;
2040 
2041         memset(&fl6, 0, sizeof(fl6));
2042         fl6.daddr = dst_addr->sin6_addr;
2043         fl6.saddr = src_addr->sin6_addr;
2044         if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
2045                 fl6.flowi6_oif = dst_addr->sin6_scope_id;
2046 
2047         dst = ip6_route_output(&init_net, NULL, &fl6);
2048         return dst;
2049 }
2050 
2051 /**
2052  * i40iw_addr_resolve_neigh_ipv6 - resolve neighbor ipv6 address
2053  * @iwdev: iwarp device structure
2054  * @dst_ip: remote ip address
2055  * @arpindex: if there is an arp entry
2056  */
2057 static int i40iw_addr_resolve_neigh_ipv6(struct i40iw_device *iwdev,
2058                                          u32 *src,
2059                                          u32 *dest,
2060                                          int arpindex)
2061 {
2062         struct neighbour *neigh;
2063         int rc = arpindex;
2064         struct dst_entry *dst;
2065         struct sockaddr_in6 dst_addr;
2066         struct sockaddr_in6 src_addr;
2067 
2068         memset(&dst_addr, 0, sizeof(dst_addr));
2069         dst_addr.sin6_family = AF_INET6;
2070         i40iw_copy_ip_htonl(dst_addr.sin6_addr.in6_u.u6_addr32, dest);
2071         memset(&src_addr, 0, sizeof(src_addr));
2072         src_addr.sin6_family = AF_INET6;
2073         i40iw_copy_ip_htonl(src_addr.sin6_addr.in6_u.u6_addr32, src);
2074         dst = i40iw_get_dst_ipv6(&src_addr, &dst_addr);
2075         if (!dst || dst->error) {
2076                 if (dst) {
2077                         dst_release(dst);
2078                         i40iw_pr_err("ip6_route_output returned dst->error = %d\n",
2079                                      dst->error);
2080                 }
2081                 return rc;
2082         }
2083 
2084         neigh = dst_neigh_lookup(dst, dst_addr.sin6_addr.in6_u.u6_addr32);
2085 
2086         rcu_read_lock();
2087         if (neigh) {
2088                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM, "dst_neigh_lookup MAC=%pM\n", neigh->ha);
2089                 if (neigh->nud_state & NUD_VALID) {
2090                         if (arpindex >= 0) {
2091                                 if (ether_addr_equal
2092                                     (iwdev->arp_table[arpindex].mac_addr,
2093                                      neigh->ha)) {
2094                                         /* Mac address same as in arp table */
2095                                         goto resolve_neigh_exit6;
2096                                 }
2097                                 i40iw_manage_arp_cache(iwdev,
2098                                                        iwdev->arp_table[arpindex].mac_addr,
2099                                                        dest,
2100                                                        false,
2101                                                        I40IW_ARP_DELETE);
2102                         }
2103                         i40iw_manage_arp_cache(iwdev,
2104                                                neigh->ha,
2105                                                dest,
2106                                                false,
2107                                                I40IW_ARP_ADD);
2108                         rc = i40iw_arp_table(iwdev,
2109                                              dest,
2110                                              false,
2111                                              NULL,
2112                                              I40IW_ARP_RESOLVE);
2113                 } else {
2114                         neigh_event_send(neigh, NULL);
2115                 }
2116         }
2117 
2118  resolve_neigh_exit6:
2119         rcu_read_unlock();
2120         if (neigh)
2121                 neigh_release(neigh);
2122         dst_release(dst);
2123         return rc;
2124 }
2125 
2126 /**
2127  * i40iw_ipv4_is_loopback - check if loopback
2128  * @loc_addr: local addr to compare
2129  * @rem_addr: remote address
2130  */
2131 static bool i40iw_ipv4_is_loopback(u32 loc_addr, u32 rem_addr)
2132 {
2133         return ipv4_is_loopback(htonl(rem_addr)) || (loc_addr == rem_addr);
2134 }
2135 
2136 /**
2137  * i40iw_ipv6_is_loopback - check if loopback
2138  * @loc_addr: local addr to compare
2139  * @rem_addr: remote address
2140  */
2141 static bool i40iw_ipv6_is_loopback(u32 *loc_addr, u32 *rem_addr)
2142 {
2143         struct in6_addr raddr6;
2144 
2145         i40iw_copy_ip_htonl(raddr6.in6_u.u6_addr32, rem_addr);
2146         return !memcmp(loc_addr, rem_addr, 16) || ipv6_addr_loopback(&raddr6);
2147 }
2148 
2149 /**
2150  * i40iw_make_cm_node - create a new instance of a cm node
2151  * @cm_core: cm's core
2152  * @iwdev: iwarp device structure
2153  * @cm_info: quad info for connection
2154  * @listener: passive connection's listener
2155  */
2156 static struct i40iw_cm_node *i40iw_make_cm_node(
2157                                    struct i40iw_cm_core *cm_core,
2158                                    struct i40iw_device *iwdev,
2159                                    struct i40iw_cm_info *cm_info,
2160                                    struct i40iw_cm_listener *listener)
2161 {
2162         struct i40iw_cm_node *cm_node;
2163         int oldarpindex;
2164         int arpindex;
2165         struct net_device *netdev = iwdev->netdev;
2166 
2167         /* create an hte and cm_node for this instance */
2168         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
2169         if (!cm_node)
2170                 return NULL;
2171 
2172         /* set our node specific transport info */
2173         cm_node->ipv4 = cm_info->ipv4;
2174         cm_node->vlan_id = cm_info->vlan_id;
2175         if ((cm_node->vlan_id == I40IW_NO_VLAN) && iwdev->dcb)
2176                 cm_node->vlan_id = 0;
2177         cm_node->tos = cm_info->tos;
2178         cm_node->user_pri = cm_info->user_pri;
2179         if (listener) {
2180                 if (listener->tos != cm_info->tos)
2181                         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB,
2182                                     "application TOS[%d] and remote client TOS[%d] mismatch\n",
2183                                      listener->tos, cm_info->tos);
2184                 cm_node->tos = max(listener->tos, cm_info->tos);
2185                 cm_node->user_pri = rt_tos2priority(cm_node->tos);
2186                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB, "listener: TOS:[%d] UP:[%d]\n",
2187                             cm_node->tos, cm_node->user_pri);
2188         }
2189         memcpy(cm_node->loc_addr, cm_info->loc_addr, sizeof(cm_node->loc_addr));
2190         memcpy(cm_node->rem_addr, cm_info->rem_addr, sizeof(cm_node->rem_addr));
2191         cm_node->loc_port = cm_info->loc_port;
2192         cm_node->rem_port = cm_info->rem_port;
2193 
2194         cm_node->mpa_frame_rev = iwdev->mpa_version;
2195         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
2196         cm_node->ird_size = I40IW_MAX_IRD_SIZE;
2197         cm_node->ord_size = I40IW_MAX_ORD_SIZE;
2198 
2199         cm_node->listener = listener;
2200         cm_node->cm_id = cm_info->cm_id;
2201         ether_addr_copy(cm_node->loc_mac, netdev->dev_addr);
2202         spin_lock_init(&cm_node->retrans_list_lock);
2203         cm_node->ack_rcvd = false;
2204 
2205         atomic_set(&cm_node->ref_count, 1);
2206         /* associate our parent CM core */
2207         cm_node->cm_core = cm_core;
2208         cm_node->tcp_cntxt.loc_id = I40IW_CM_DEF_LOCAL_ID;
2209         cm_node->tcp_cntxt.rcv_wscale = I40IW_CM_DEFAULT_RCV_WND_SCALE;
2210         cm_node->tcp_cntxt.rcv_wnd =
2211                         I40IW_CM_DEFAULT_RCV_WND_SCALED >> I40IW_CM_DEFAULT_RCV_WND_SCALE;
2212         if (cm_node->ipv4) {
2213                 cm_node->tcp_cntxt.loc_seq_num = secure_tcp_seq(htonl(cm_node->loc_addr[0]),
2214                                                         htonl(cm_node->rem_addr[0]),
2215                                                         htons(cm_node->loc_port),
2216                                                         htons(cm_node->rem_port));
2217                 cm_node->tcp_cntxt.mss = iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV4;
2218         } else if (IS_ENABLED(CONFIG_IPV6)) {
2219                 __be32 loc[4] = {
2220                         htonl(cm_node->loc_addr[0]), htonl(cm_node->loc_addr[1]),
2221                         htonl(cm_node->loc_addr[2]), htonl(cm_node->loc_addr[3])
2222                 };
2223                 __be32 rem[4] = {
2224                         htonl(cm_node->rem_addr[0]), htonl(cm_node->rem_addr[1]),
2225                         htonl(cm_node->rem_addr[2]), htonl(cm_node->rem_addr[3])
2226                 };
2227                 cm_node->tcp_cntxt.loc_seq_num = secure_tcpv6_seq(loc, rem,
2228                                                         htons(cm_node->loc_port),
2229                                                         htons(cm_node->rem_port));
2230                 cm_node->tcp_cntxt.mss = iwdev->vsi.mtu - I40IW_MTU_TO_MSS_IPV6;
2231         }
2232 
2233         cm_node->iwdev = iwdev;
2234         cm_node->dev = &iwdev->sc_dev;
2235 
2236         if ((cm_node->ipv4 &&
2237              i40iw_ipv4_is_loopback(cm_node->loc_addr[0], cm_node->rem_addr[0])) ||
2238              (!cm_node->ipv4 && i40iw_ipv6_is_loopback(cm_node->loc_addr,
2239                                                        cm_node->rem_addr))) {
2240                 arpindex = i40iw_arp_table(iwdev,
2241                                            cm_node->rem_addr,
2242                                            false,
2243                                            NULL,
2244                                            I40IW_ARP_RESOLVE);
2245         } else {
2246                 oldarpindex = i40iw_arp_table(iwdev,
2247                                               cm_node->rem_addr,
2248                                               false,
2249                                               NULL,
2250                                               I40IW_ARP_RESOLVE);
2251                 if (cm_node->ipv4)
2252                         arpindex = i40iw_addr_resolve_neigh(iwdev,
2253                                                             cm_info->loc_addr[0],
2254                                                             cm_info->rem_addr[0],
2255                                                             oldarpindex);
2256                 else if (IS_ENABLED(CONFIG_IPV6))
2257                         arpindex = i40iw_addr_resolve_neigh_ipv6(iwdev,
2258                                                                  cm_info->loc_addr,
2259                                                                  cm_info->rem_addr,
2260                                                                  oldarpindex);
2261                 else
2262                         arpindex = -EINVAL;
2263         }
2264         if (arpindex < 0) {
2265                 i40iw_pr_err("cm_node arpindex\n");
2266                 kfree(cm_node);
2267                 return NULL;
2268         }
2269         ether_addr_copy(cm_node->rem_mac, iwdev->arp_table[arpindex].mac_addr);
2270         i40iw_add_hte_node(cm_core, cm_node);
2271         cm_core->stats_nodes_created++;
2272         return cm_node;
2273 }
2274 
2275 /**
2276  * i40iw_rem_ref_cm_node - destroy an instance of a cm node
2277  * @cm_node: connection's node
2278  */
2279 static void i40iw_rem_ref_cm_node(struct i40iw_cm_node *cm_node)
2280 {
2281         struct i40iw_cm_core *cm_core = cm_node->cm_core;
2282         struct i40iw_qp *iwqp;
2283         struct i40iw_cm_info nfo;
2284         unsigned long flags;
2285 
2286         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
2287         if (atomic_dec_return(&cm_node->ref_count)) {
2288                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2289                 return;
2290         }
2291         list_del(&cm_node->list);
2292         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
2293 
2294         /* if the node is destroyed before connection was accelerated */
2295         if (!cm_node->accelerated && cm_node->accept_pend) {
2296                 pr_err("node destroyed before established\n");
2297                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
2298         }
2299         if (cm_node->close_entry)
2300                 i40iw_handle_close_entry(cm_node, 0);
2301         if (cm_node->listener) {
2302                 i40iw_dec_refcnt_listen(cm_core, cm_node->listener, 0, true);
2303         } else {
2304                 if (cm_node->apbvt_set) {
2305                         i40iw_manage_apbvt(cm_node->iwdev,
2306                                            cm_node->loc_port,
2307                                            I40IW_MANAGE_APBVT_DEL);
2308                         cm_node->apbvt_set = 0;
2309                 }
2310                 i40iw_get_addr_info(cm_node, &nfo);
2311                 if (cm_node->qhash_set) {
2312                         i40iw_manage_qhash(cm_node->iwdev,
2313                                            &nfo,
2314                                            I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2315                                            I40IW_QHASH_MANAGE_TYPE_DELETE,
2316                                            NULL,
2317                                            false);
2318                         cm_node->qhash_set = 0;
2319                 }
2320         }
2321 
2322         iwqp = cm_node->iwqp;
2323         if (iwqp) {
2324                 iwqp->cm_node = NULL;
2325                 i40iw_rem_ref(&iwqp->ibqp);
2326                 cm_node->iwqp = NULL;
2327         } else if (cm_node->qhash_set) {
2328                 i40iw_get_addr_info(cm_node, &nfo);
2329                 i40iw_manage_qhash(cm_node->iwdev,
2330                                    &nfo,
2331                                    I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2332                                    I40IW_QHASH_MANAGE_TYPE_DELETE,
2333                                    NULL,
2334                                    false);
2335                 cm_node->qhash_set = 0;
2336         }
2337 
2338         cm_node->cm_core->stats_nodes_destroyed++;
2339         kfree(cm_node);
2340 }
2341 
2342 /**
2343  * i40iw_handle_fin_pkt - FIN packet received
2344  * @cm_node: connection's node
2345  */
2346 static void i40iw_handle_fin_pkt(struct i40iw_cm_node *cm_node)
2347 {
2348         u32 ret;
2349 
2350         switch (cm_node->state) {
2351         case I40IW_CM_STATE_SYN_RCVD:
2352         case I40IW_CM_STATE_SYN_SENT:
2353         case I40IW_CM_STATE_ESTABLISHED:
2354         case I40IW_CM_STATE_MPAREJ_RCVD:
2355                 cm_node->tcp_cntxt.rcv_nxt++;
2356                 i40iw_cleanup_retrans_entry(cm_node);
2357                 cm_node->state = I40IW_CM_STATE_LAST_ACK;
2358                 i40iw_send_fin(cm_node);
2359                 break;
2360         case I40IW_CM_STATE_MPAREQ_SENT:
2361                 i40iw_create_event(cm_node, I40IW_CM_EVENT_ABORTED);
2362                 cm_node->tcp_cntxt.rcv_nxt++;
2363                 i40iw_cleanup_retrans_entry(cm_node);
2364                 cm_node->state = I40IW_CM_STATE_CLOSED;
2365                 atomic_inc(&cm_node->ref_count);
2366                 i40iw_send_reset(cm_node);
2367                 break;
2368         case I40IW_CM_STATE_FIN_WAIT1:
2369                 cm_node->tcp_cntxt.rcv_nxt++;
2370                 i40iw_cleanup_retrans_entry(cm_node);
2371                 cm_node->state = I40IW_CM_STATE_CLOSING;
2372                 i40iw_send_ack(cm_node);
2373                 /*
2374                  * Wait for ACK as this is simultaneous close.
2375                  * After we receive ACK, do not send anything.
2376                  * Just rm the node.
2377                  */
2378                 break;
2379         case I40IW_CM_STATE_FIN_WAIT2:
2380                 cm_node->tcp_cntxt.rcv_nxt++;
2381                 i40iw_cleanup_retrans_entry(cm_node);
2382                 cm_node->state = I40IW_CM_STATE_TIME_WAIT;
2383                 i40iw_send_ack(cm_node);
2384                 ret =
2385                     i40iw_schedule_cm_timer(cm_node, NULL, I40IW_TIMER_TYPE_CLOSE, 1, 0);
2386                 if (ret)
2387                         i40iw_pr_err("node %p state = %d\n", cm_node, cm_node->state);
2388                 break;
2389         case I40IW_CM_STATE_TIME_WAIT:
2390                 cm_node->tcp_cntxt.rcv_nxt++;
2391                 i40iw_cleanup_retrans_entry(cm_node);
2392                 cm_node->state = I40IW_CM_STATE_CLOSED;
2393                 i40iw_rem_ref_cm_node(cm_node);
2394                 break;
2395         case I40IW_CM_STATE_OFFLOADED:
2396         default:
2397                 i40iw_pr_err("bad state node %p state = %d\n", cm_node, cm_node->state);
2398                 break;
2399         }
2400 }
2401 
2402 /**
2403  * i40iw_handle_rst_pkt - process received RST packet
2404  * @cm_node: connection's node
2405  * @rbuf: receive buffer
2406  */
2407 static void i40iw_handle_rst_pkt(struct i40iw_cm_node *cm_node,
2408                                  struct i40iw_puda_buf *rbuf)
2409 {
2410         i40iw_cleanup_retrans_entry(cm_node);
2411         switch (cm_node->state) {
2412         case I40IW_CM_STATE_SYN_SENT:
2413         case I40IW_CM_STATE_MPAREQ_SENT:
2414                 switch (cm_node->mpa_frame_rev) {
2415                 case IETF_MPA_V2:
2416                         cm_node->mpa_frame_rev = IETF_MPA_V1;
2417                         /* send a syn and goto syn sent state */
2418                         cm_node->state = I40IW_CM_STATE_SYN_SENT;
2419                         if (i40iw_send_syn(cm_node, 0))
2420                                 i40iw_active_open_err(cm_node, false);
2421                         break;
2422                 case IETF_MPA_V1:
2423                 default:
2424                         i40iw_active_open_err(cm_node, false);
2425                         break;
2426                 }
2427                 break;
2428         case I40IW_CM_STATE_MPAREQ_RCVD:
2429                 atomic_add_return(1, &cm_node->passive_state);
2430                 break;
2431         case I40IW_CM_STATE_ESTABLISHED:
2432         case I40IW_CM_STATE_SYN_RCVD:
2433         case I40IW_CM_STATE_LISTENING:
2434                 i40iw_pr_err("Bad state state = %d\n", cm_node->state);
2435                 i40iw_passive_open_err(cm_node, false);
2436                 break;
2437         case I40IW_CM_STATE_OFFLOADED:
2438                 i40iw_active_open_err(cm_node, false);
2439                 break;
2440         case I40IW_CM_STATE_CLOSED:
2441                 break;
2442         case I40IW_CM_STATE_FIN_WAIT2:
2443         case I40IW_CM_STATE_FIN_WAIT1:
2444         case I40IW_CM_STATE_LAST_ACK:
2445                 cm_node->cm_id->rem_ref(cm_node->cm_id);
2446                 /* fall through */
2447         case I40IW_CM_STATE_TIME_WAIT:
2448                 cm_node->state = I40IW_CM_STATE_CLOSED;
2449                 i40iw_rem_ref_cm_node(cm_node);
2450                 break;
2451         default:
2452                 break;
2453         }
2454 }
2455 
2456 /**
2457  * i40iw_handle_rcv_mpa - Process a recv'd mpa buffer
2458  * @cm_node: connection's node
2459  * @rbuf: receive buffer
2460  */
2461 static void i40iw_handle_rcv_mpa(struct i40iw_cm_node *cm_node,
2462                                  struct i40iw_puda_buf *rbuf)
2463 {
2464         int ret;
2465         int datasize = rbuf->datalen;
2466         u8 *dataloc = rbuf->data;
2467 
2468         enum i40iw_cm_event_type type = I40IW_CM_EVENT_UNKNOWN;
2469         u32 res_type;
2470 
2471         ret = i40iw_parse_mpa(cm_node, dataloc, &res_type, datasize);
2472         if (ret) {
2473                 if (cm_node->state == I40IW_CM_STATE_MPAREQ_SENT)
2474                         i40iw_active_open_err(cm_node, true);
2475                 else
2476                         i40iw_passive_open_err(cm_node, true);
2477                 return;
2478         }
2479 
2480         switch (cm_node->state) {
2481         case I40IW_CM_STATE_ESTABLISHED:
2482                 if (res_type == I40IW_MPA_REQUEST_REJECT)
2483                         i40iw_pr_err("state for reject\n");
2484                 cm_node->state = I40IW_CM_STATE_MPAREQ_RCVD;
2485                 type = I40IW_CM_EVENT_MPA_REQ;
2486                 i40iw_send_ack(cm_node);        /* ACK received MPA request */
2487                 atomic_set(&cm_node->passive_state,
2488                            I40IW_PASSIVE_STATE_INDICATED);
2489                 break;
2490         case I40IW_CM_STATE_MPAREQ_SENT:
2491                 i40iw_cleanup_retrans_entry(cm_node);
2492                 if (res_type == I40IW_MPA_REQUEST_REJECT) {
2493                         type = I40IW_CM_EVENT_MPA_REJECT;
2494                         cm_node->state = I40IW_CM_STATE_MPAREJ_RCVD;
2495                 } else {
2496                         type = I40IW_CM_EVENT_CONNECTED;
2497                         cm_node->state = I40IW_CM_STATE_OFFLOADED;
2498                 }
2499                 i40iw_send_ack(cm_node);
2500                 break;
2501         default:
2502                 pr_err("%s wrong cm_node state =%d\n", __func__, cm_node->state);
2503                 break;
2504         }
2505         i40iw_create_event(cm_node, type);
2506 }
2507 
2508 /**
2509  * i40iw_indicate_pkt_err - Send up err event to cm
2510  * @cm_node: connection's node
2511  */
2512 static void i40iw_indicate_pkt_err(struct i40iw_cm_node *cm_node)
2513 {
2514         switch (cm_node->state) {
2515         case I40IW_CM_STATE_SYN_SENT:
2516         case I40IW_CM_STATE_MPAREQ_SENT:
2517                 i40iw_active_open_err(cm_node, true);
2518                 break;
2519         case I40IW_CM_STATE_ESTABLISHED:
2520         case I40IW_CM_STATE_SYN_RCVD:
2521                 i40iw_passive_open_err(cm_node, true);
2522                 break;
2523         case I40IW_CM_STATE_OFFLOADED:
2524         default:
2525                 break;
2526         }
2527 }
2528 
2529 /**
2530  * i40iw_check_syn - Check for error on received syn ack
2531  * @cm_node: connection's node
2532  * @tcph: pointer tcp header
2533  */
2534 static int i40iw_check_syn(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2535 {
2536         int err = 0;
2537 
2538         if (ntohl(tcph->ack_seq) != cm_node->tcp_cntxt.loc_seq_num) {
2539                 err = 1;
2540                 i40iw_active_open_err(cm_node, true);
2541         }
2542         return err;
2543 }
2544 
2545 /**
2546  * i40iw_check_seq - check seq numbers if OK
2547  * @cm_node: connection's node
2548  * @tcph: pointer tcp header
2549  */
2550 static int i40iw_check_seq(struct i40iw_cm_node *cm_node, struct tcphdr *tcph)
2551 {
2552         int err = 0;
2553         u32 seq;
2554         u32 ack_seq;
2555         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
2556         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
2557         u32 rcv_wnd;
2558 
2559         seq = ntohl(tcph->seq);
2560         ack_seq = ntohl(tcph->ack_seq);
2561         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
2562         if (ack_seq != loc_seq_num)
2563                 err = -1;
2564         else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
2565                 err = -1;
2566         if (err) {
2567                 i40iw_pr_err("seq number\n");
2568                 i40iw_indicate_pkt_err(cm_node);
2569         }
2570         return err;
2571 }
2572 
2573 /**
2574  * i40iw_handle_syn_pkt - is for Passive node
2575  * @cm_node: connection's node
2576  * @rbuf: receive buffer
2577  */
2578 static void i40iw_handle_syn_pkt(struct i40iw_cm_node *cm_node,
2579                                  struct i40iw_puda_buf *rbuf)
2580 {
2581         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2582         int ret;
2583         u32 inc_sequence;
2584         int optionsize;
2585         struct i40iw_cm_info nfo;
2586 
2587         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2588         inc_sequence = ntohl(tcph->seq);
2589 
2590         switch (cm_node->state) {
2591         case I40IW_CM_STATE_SYN_SENT:
2592         case I40IW_CM_STATE_MPAREQ_SENT:
2593                 /* Rcvd syn on active open connection */
2594                 i40iw_active_open_err(cm_node, 1);
2595                 break;
2596         case I40IW_CM_STATE_LISTENING:
2597                 /* Passive OPEN */
2598                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
2599                     cm_node->listener->backlog) {
2600                         cm_node->cm_core->stats_backlog_drops++;
2601                         i40iw_passive_open_err(cm_node, false);
2602                         break;
2603                 }
2604                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2605                 if (ret) {
2606                         i40iw_passive_open_err(cm_node, false);
2607                         /* drop pkt */
2608                         break;
2609                 }
2610                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2611                 cm_node->accept_pend = 1;
2612                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
2613 
2614                 cm_node->state = I40IW_CM_STATE_SYN_RCVD;
2615                 i40iw_get_addr_info(cm_node, &nfo);
2616                 ret = i40iw_manage_qhash(cm_node->iwdev,
2617                                          &nfo,
2618                                          I40IW_QHASH_TYPE_TCP_ESTABLISHED,
2619                                          I40IW_QHASH_MANAGE_TYPE_ADD,
2620                                          (void *)cm_node,
2621                                          false);
2622                 cm_node->qhash_set = true;
2623                 break;
2624         case I40IW_CM_STATE_CLOSED:
2625                 i40iw_cleanup_retrans_entry(cm_node);
2626                 atomic_inc(&cm_node->ref_count);
2627                 i40iw_send_reset(cm_node);
2628                 break;
2629         case I40IW_CM_STATE_OFFLOADED:
2630         case I40IW_CM_STATE_ESTABLISHED:
2631         case I40IW_CM_STATE_FIN_WAIT1:
2632         case I40IW_CM_STATE_FIN_WAIT2:
2633         case I40IW_CM_STATE_MPAREQ_RCVD:
2634         case I40IW_CM_STATE_LAST_ACK:
2635         case I40IW_CM_STATE_CLOSING:
2636         case I40IW_CM_STATE_UNKNOWN:
2637         default:
2638                 break;
2639         }
2640 }
2641 
2642 /**
2643  * i40iw_handle_synack_pkt - Process SYN+ACK packet (active side)
2644  * @cm_node: connection's node
2645  * @rbuf: receive buffer
2646  */
2647 static void i40iw_handle_synack_pkt(struct i40iw_cm_node *cm_node,
2648                                     struct i40iw_puda_buf *rbuf)
2649 {
2650         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2651         int ret;
2652         u32 inc_sequence;
2653         int optionsize;
2654 
2655         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2656         inc_sequence = ntohl(tcph->seq);
2657         switch (cm_node->state) {
2658         case I40IW_CM_STATE_SYN_SENT:
2659                 i40iw_cleanup_retrans_entry(cm_node);
2660                 /* active open */
2661                 if (i40iw_check_syn(cm_node, tcph)) {
2662                         i40iw_pr_err("check syn fail\n");
2663                         return;
2664                 }
2665                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2666                 /* setup options */
2667                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 0);
2668                 if (ret) {
2669                         i40iw_debug(cm_node->dev,
2670                                     I40IW_DEBUG_CM,
2671                                     "cm_node=%p tcp_options failed\n",
2672                                     cm_node);
2673                         break;
2674                 }
2675                 i40iw_cleanup_retrans_entry(cm_node);
2676                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
2677                 i40iw_send_ack(cm_node);        /* ACK  for the syn_ack */
2678                 ret = i40iw_send_mpa_request(cm_node);
2679                 if (ret) {
2680                         i40iw_debug(cm_node->dev,
2681                                     I40IW_DEBUG_CM,
2682                                     "cm_node=%p i40iw_send_mpa_request failed\n",
2683                                     cm_node);
2684                         break;
2685                 }
2686                 cm_node->state = I40IW_CM_STATE_MPAREQ_SENT;
2687                 break;
2688         case I40IW_CM_STATE_MPAREQ_RCVD:
2689                 i40iw_passive_open_err(cm_node, true);
2690                 break;
2691         case I40IW_CM_STATE_LISTENING:
2692                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2693                 i40iw_cleanup_retrans_entry(cm_node);
2694                 cm_node->state = I40IW_CM_STATE_CLOSED;
2695                 i40iw_send_reset(cm_node);
2696                 break;
2697         case I40IW_CM_STATE_CLOSED:
2698                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2699                 i40iw_cleanup_retrans_entry(cm_node);
2700                 atomic_inc(&cm_node->ref_count);
2701                 i40iw_send_reset(cm_node);
2702                 break;
2703         case I40IW_CM_STATE_ESTABLISHED:
2704         case I40IW_CM_STATE_FIN_WAIT1:
2705         case I40IW_CM_STATE_FIN_WAIT2:
2706         case I40IW_CM_STATE_LAST_ACK:
2707         case I40IW_CM_STATE_OFFLOADED:
2708         case I40IW_CM_STATE_CLOSING:
2709         case I40IW_CM_STATE_UNKNOWN:
2710         case I40IW_CM_STATE_MPAREQ_SENT:
2711         default:
2712                 break;
2713         }
2714 }
2715 
2716 /**
2717  * i40iw_handle_ack_pkt - process packet with ACK
2718  * @cm_node: connection's node
2719  * @rbuf: receive buffer
2720  */
2721 static int i40iw_handle_ack_pkt(struct i40iw_cm_node *cm_node,
2722                                 struct i40iw_puda_buf *rbuf)
2723 {
2724         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2725         u32 inc_sequence;
2726         int ret = 0;
2727         int optionsize;
2728         u32 datasize = rbuf->datalen;
2729 
2730         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2731 
2732         if (i40iw_check_seq(cm_node, tcph))
2733                 return -EINVAL;
2734 
2735         inc_sequence = ntohl(tcph->seq);
2736         switch (cm_node->state) {
2737         case I40IW_CM_STATE_SYN_RCVD:
2738                 i40iw_cleanup_retrans_entry(cm_node);
2739                 ret = i40iw_handle_tcp_options(cm_node, tcph, optionsize, 1);
2740                 if (ret)
2741                         break;
2742                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2743                 cm_node->state = I40IW_CM_STATE_ESTABLISHED;
2744                 if (datasize) {
2745                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2746                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2747                 }
2748                 break;
2749         case I40IW_CM_STATE_ESTABLISHED:
2750                 i40iw_cleanup_retrans_entry(cm_node);
2751                 if (datasize) {
2752                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2753                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2754                 }
2755                 break;
2756         case I40IW_CM_STATE_MPAREQ_SENT:
2757                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2758                 if (datasize) {
2759                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2760                         cm_node->ack_rcvd = false;
2761                         i40iw_handle_rcv_mpa(cm_node, rbuf);
2762                 } else {
2763                         cm_node->ack_rcvd = true;
2764                 }
2765                 break;
2766         case I40IW_CM_STATE_LISTENING:
2767                 i40iw_cleanup_retrans_entry(cm_node);
2768                 cm_node->state = I40IW_CM_STATE_CLOSED;
2769                 i40iw_send_reset(cm_node);
2770                 break;
2771         case I40IW_CM_STATE_CLOSED:
2772                 i40iw_cleanup_retrans_entry(cm_node);
2773                 atomic_inc(&cm_node->ref_count);
2774                 i40iw_send_reset(cm_node);
2775                 break;
2776         case I40IW_CM_STATE_LAST_ACK:
2777         case I40IW_CM_STATE_CLOSING:
2778                 i40iw_cleanup_retrans_entry(cm_node);
2779                 cm_node->state = I40IW_CM_STATE_CLOSED;
2780                 if (!cm_node->accept_pend)
2781                         cm_node->cm_id->rem_ref(cm_node->cm_id);
2782                 i40iw_rem_ref_cm_node(cm_node);
2783                 break;
2784         case I40IW_CM_STATE_FIN_WAIT1:
2785                 i40iw_cleanup_retrans_entry(cm_node);
2786                 cm_node->state = I40IW_CM_STATE_FIN_WAIT2;
2787                 break;
2788         case I40IW_CM_STATE_SYN_SENT:
2789         case I40IW_CM_STATE_FIN_WAIT2:
2790         case I40IW_CM_STATE_OFFLOADED:
2791         case I40IW_CM_STATE_MPAREQ_RCVD:
2792         case I40IW_CM_STATE_UNKNOWN:
2793         default:
2794                 i40iw_cleanup_retrans_entry(cm_node);
2795                 break;
2796         }
2797         return ret;
2798 }
2799 
2800 /**
2801  * i40iw_process_packet - process cm packet
2802  * @cm_node: connection's node
2803  * @rbuf: receive buffer
2804  */
2805 static void i40iw_process_packet(struct i40iw_cm_node *cm_node,
2806                                  struct i40iw_puda_buf *rbuf)
2807 {
2808         enum i40iw_tcpip_pkt_type pkt_type = I40IW_PKT_TYPE_UNKNOWN;
2809         struct tcphdr *tcph = (struct tcphdr *)rbuf->tcph;
2810         u32 fin_set = 0;
2811         int ret;
2812 
2813         if (tcph->rst) {
2814                 pkt_type = I40IW_PKT_TYPE_RST;
2815         } else if (tcph->syn) {
2816                 pkt_type = I40IW_PKT_TYPE_SYN;
2817                 if (tcph->ack)
2818                         pkt_type = I40IW_PKT_TYPE_SYNACK;
2819         } else if (tcph->ack) {
2820                 pkt_type = I40IW_PKT_TYPE_ACK;
2821         }
2822         if (tcph->fin)
2823                 fin_set = 1;
2824 
2825         switch (pkt_type) {
2826         case I40IW_PKT_TYPE_SYN:
2827                 i40iw_handle_syn_pkt(cm_node, rbuf);
2828                 break;
2829         case I40IW_PKT_TYPE_SYNACK:
2830                 i40iw_handle_synack_pkt(cm_node, rbuf);
2831                 break;
2832         case I40IW_PKT_TYPE_ACK:
2833                 ret = i40iw_handle_ack_pkt(cm_node, rbuf);
2834                 if (fin_set && !ret)
2835                         i40iw_handle_fin_pkt(cm_node);
2836                 break;
2837         case I40IW_PKT_TYPE_RST:
2838                 i40iw_handle_rst_pkt(cm_node, rbuf);
2839                 break;
2840         default:
2841                 if (fin_set &&
2842                     (!i40iw_check_seq(cm_node, (struct tcphdr *)rbuf->tcph)))
2843                         i40iw_handle_fin_pkt(cm_node);
2844                 break;
2845         }
2846 }
2847 
2848 /**
2849  * i40iw_make_listen_node - create a listen node with params
2850  * @cm_core: cm's core
2851  * @iwdev: iwarp device structure
2852  * @cm_info: quad info for connection
2853  */
2854 static struct i40iw_cm_listener *i40iw_make_listen_node(
2855                                         struct i40iw_cm_core *cm_core,
2856                                         struct i40iw_device *iwdev,
2857                                         struct i40iw_cm_info *cm_info)
2858 {
2859         struct i40iw_cm_listener *listener;
2860         unsigned long flags;
2861 
2862         /* cannot have multiple matching listeners */
2863         listener = i40iw_find_listener(cm_core, cm_info->loc_addr,
2864                                        cm_info->loc_port,
2865                                        cm_info->vlan_id,
2866                                        I40IW_CM_LISTENER_EITHER_STATE);
2867         if (listener &&
2868             (listener->listener_state == I40IW_CM_LISTENER_ACTIVE_STATE)) {
2869                 atomic_dec(&listener->ref_count);
2870                 i40iw_debug(cm_core->dev,
2871                             I40IW_DEBUG_CM,
2872                             "Not creating listener since it already exists\n");
2873                 return NULL;
2874         }
2875 
2876         if (!listener) {
2877                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2878                 listener = kzalloc(sizeof(*listener), GFP_KERNEL);
2879                 if (!listener)
2880                         return NULL;
2881                 cm_core->stats_listen_nodes_created++;
2882                 memcpy(listener->loc_addr, cm_info->loc_addr, sizeof(listener->loc_addr));
2883                 listener->loc_port = cm_info->loc_port;
2884 
2885                 INIT_LIST_HEAD(&listener->child_listen_list);
2886 
2887                 atomic_set(&listener->ref_count, 1);
2888         } else {
2889                 listener->reused_node = 1;
2890         }
2891 
2892         listener->cm_id = cm_info->cm_id;
2893         listener->ipv4 = cm_info->ipv4;
2894         listener->vlan_id = cm_info->vlan_id;
2895         atomic_set(&listener->pend_accepts_cnt, 0);
2896         listener->cm_core = cm_core;
2897         listener->iwdev = iwdev;
2898 
2899         listener->backlog = cm_info->backlog;
2900         listener->listener_state = I40IW_CM_LISTENER_ACTIVE_STATE;
2901 
2902         if (!listener->reused_node) {
2903                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2904                 list_add(&listener->list, &cm_core->listen_nodes);
2905                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2906         }
2907 
2908         return listener;
2909 }
2910 
2911 /**
2912  * i40iw_create_cm_node - make a connection node with params
2913  * @cm_core: cm's core
2914  * @iwdev: iwarp device structure
2915  * @conn_param: upper layer connection parameters
2916  * @cm_info: quad info for connection
2917  */
2918 static struct i40iw_cm_node *i40iw_create_cm_node(
2919                                         struct i40iw_cm_core *cm_core,
2920                                         struct i40iw_device *iwdev,
2921                                         struct iw_cm_conn_param *conn_param,
2922                                         struct i40iw_cm_info *cm_info)
2923 {
2924         struct i40iw_cm_node *cm_node;
2925         struct i40iw_cm_listener *loopback_remotelistener;
2926         struct i40iw_cm_node *loopback_remotenode;
2927         struct i40iw_cm_info loopback_cm_info;
2928 
2929         u16 private_data_len = conn_param->private_data_len;
2930         const void *private_data = conn_param->private_data;
2931 
2932         /* create a CM connection node */
2933         cm_node = i40iw_make_cm_node(cm_core, iwdev, cm_info, NULL);
2934         if (!cm_node)
2935                 return ERR_PTR(-ENOMEM);
2936         /* set our node side to client (active) side */
2937         cm_node->tcp_cntxt.client = 1;
2938         cm_node->tcp_cntxt.rcv_wscale = I40IW_CM_DEFAULT_RCV_WND_SCALE;
2939 
2940         i40iw_record_ird_ord(cm_node, conn_param->ird, conn_param->ord);
2941 
2942         if (!memcmp(cm_info->loc_addr, cm_info->rem_addr, sizeof(cm_info->loc_addr))) {
2943                 loopback_remotelistener = i40iw_find_listener(
2944                                                 cm_core,
2945                                                 cm_info->rem_addr,
2946                                                 cm_node->rem_port,
2947                                                 cm_node->vlan_id,
2948                                                 I40IW_CM_LISTENER_ACTIVE_STATE);
2949                 if (!loopback_remotelistener) {
2950                         i40iw_rem_ref_cm_node(cm_node);
2951                         return ERR_PTR(-ECONNREFUSED);
2952                 } else {
2953                         loopback_cm_info = *cm_info;
2954                         loopback_cm_info.loc_port = cm_info->rem_port;
2955                         loopback_cm_info.rem_port = cm_info->loc_port;
2956                         loopback_cm_info.cm_id = loopback_remotelistener->cm_id;
2957                         loopback_cm_info.ipv4 = cm_info->ipv4;
2958                         loopback_remotenode = i40iw_make_cm_node(cm_core,
2959                                                                  iwdev,
2960                                                                  &loopback_cm_info,
2961                                                                  loopback_remotelistener);
2962                         if (!loopback_remotenode) {
2963                                 i40iw_rem_ref_cm_node(cm_node);
2964                                 return ERR_PTR(-ENOMEM);
2965                         }
2966                         cm_core->stats_loopbacks++;
2967                         loopback_remotenode->loopbackpartner = cm_node;
2968                         loopback_remotenode->tcp_cntxt.rcv_wscale =
2969                                 I40IW_CM_DEFAULT_RCV_WND_SCALE;
2970                         cm_node->loopbackpartner = loopback_remotenode;
2971                         memcpy(loopback_remotenode->pdata_buf, private_data,
2972                                private_data_len);
2973                         loopback_remotenode->pdata.size = private_data_len;
2974 
2975                         if (loopback_remotenode->ord_size > cm_node->ird_size)
2976                                 loopback_remotenode->ord_size =
2977                                         cm_node->ird_size;
2978 
2979                         cm_node->state = I40IW_CM_STATE_OFFLOADED;
2980                         cm_node->tcp_cntxt.rcv_nxt =
2981                                 loopback_remotenode->tcp_cntxt.loc_seq_num;
2982                         loopback_remotenode->tcp_cntxt.rcv_nxt =
2983                                 cm_node->tcp_cntxt.loc_seq_num;
2984                         cm_node->tcp_cntxt.max_snd_wnd =
2985                                 loopback_remotenode->tcp_cntxt.rcv_wnd;
2986                         loopback_remotenode->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
2987                         cm_node->tcp_cntxt.snd_wnd = loopback_remotenode->tcp_cntxt.rcv_wnd;
2988                         loopback_remotenode->tcp_cntxt.snd_wnd = cm_node->tcp_cntxt.rcv_wnd;
2989                         cm_node->tcp_cntxt.snd_wscale = loopback_remotenode->tcp_cntxt.rcv_wscale;
2990                         loopback_remotenode->tcp_cntxt.snd_wscale = cm_node->tcp_cntxt.rcv_wscale;
2991                 }
2992                 return cm_node;
2993         }
2994 
2995         cm_node->pdata.size = private_data_len;
2996         cm_node->pdata.addr = cm_node->pdata_buf;
2997 
2998         memcpy(cm_node->pdata_buf, private_data, private_data_len);
2999 
3000         cm_node->state = I40IW_CM_STATE_SYN_SENT;
3001         return cm_node;
3002 }
3003 
3004 /**
3005  * i40iw_cm_reject - reject and teardown a connection
3006  * @cm_node: connection's node
3007  * @pdate: ptr to private data for reject
3008  * @plen: size of private data
3009  */
3010 static int i40iw_cm_reject(struct i40iw_cm_node *cm_node, const void *pdata, u8 plen)
3011 {
3012         int ret = 0;
3013         int err;
3014         int passive_state;
3015         struct iw_cm_id *cm_id = cm_node->cm_id;
3016         struct i40iw_cm_node *loopback = cm_node->loopbackpartner;
3017 
3018         if (cm_node->tcp_cntxt.client)
3019                 return ret;
3020         i40iw_cleanup_retrans_entry(cm_node);
3021 
3022         if (!loopback) {
3023                 passive_state = atomic_add_return(1, &cm_node->passive_state);
3024                 if (passive_state == I40IW_SEND_RESET_EVENT) {
3025                         cm_node->state = I40IW_CM_STATE_CLOSED;
3026                         i40iw_rem_ref_cm_node(cm_node);
3027                 } else {
3028                         if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
3029                                 i40iw_rem_ref_cm_node(cm_node);
3030                         } else {
3031                                 ret = i40iw_send_mpa_reject(cm_node, pdata, plen);
3032                                 if (ret) {
3033                                         cm_node->state = I40IW_CM_STATE_CLOSED;
3034                                         err = i40iw_send_reset(cm_node);
3035                                         if (err)
3036                                                 i40iw_pr_err("send reset failed\n");
3037                                 } else {
3038                                         cm_id->add_ref(cm_id);
3039                                 }
3040                         }
3041                 }
3042         } else {
3043                 cm_node->cm_id = NULL;
3044                 if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
3045                         i40iw_rem_ref_cm_node(cm_node);
3046                         i40iw_rem_ref_cm_node(loopback);
3047                 } else {
3048                         ret = i40iw_send_cm_event(loopback,
3049                                                   loopback->cm_id,
3050                                                   IW_CM_EVENT_CONNECT_REPLY,
3051                                                   -ECONNREFUSED);
3052                         i40iw_rem_ref_cm_node(cm_node);
3053                         loopback->state = I40IW_CM_STATE_CLOSING;
3054 
3055                         cm_id = loopback->cm_id;
3056                         i40iw_rem_ref_cm_node(loopback);
3057                         cm_id->rem_ref(cm_id);
3058                 }
3059         }
3060 
3061         return ret;
3062 }
3063 
3064 /**
3065  * i40iw_cm_close - close of cm connection
3066  * @cm_node: connection's node
3067  */
3068 static int i40iw_cm_close(struct i40iw_cm_node *cm_node)
3069 {
3070         int ret = 0;
3071 
3072         if (!cm_node)
3073                 return -EINVAL;
3074 
3075         switch (cm_node->state) {
3076         case I40IW_CM_STATE_SYN_RCVD:
3077         case I40IW_CM_STATE_SYN_SENT:
3078         case I40IW_CM_STATE_ONE_SIDE_ESTABLISHED:
3079         case I40IW_CM_STATE_ESTABLISHED:
3080         case I40IW_CM_STATE_ACCEPTING:
3081         case I40IW_CM_STATE_MPAREQ_SENT:
3082         case I40IW_CM_STATE_MPAREQ_RCVD:
3083                 i40iw_cleanup_retrans_entry(cm_node);
3084                 i40iw_send_reset(cm_node);
3085                 break;
3086         case I40IW_CM_STATE_CLOSE_WAIT:
3087                 cm_node->state = I40IW_CM_STATE_LAST_ACK;
3088                 i40iw_send_fin(cm_node);
3089                 break;
3090         case I40IW_CM_STATE_FIN_WAIT1:
3091         case I40IW_CM_STATE_FIN_WAIT2:
3092         case I40IW_CM_STATE_LAST_ACK:
3093         case I40IW_CM_STATE_TIME_WAIT:
3094         case I40IW_CM_STATE_CLOSING:
3095                 ret = -1;
3096                 break;
3097         case I40IW_CM_STATE_LISTENING:
3098                 i40iw_cleanup_retrans_entry(cm_node);
3099                 i40iw_send_reset(cm_node);
3100                 break;
3101         case I40IW_CM_STATE_MPAREJ_RCVD:
3102         case I40IW_CM_STATE_UNKNOWN:
3103         case I40IW_CM_STATE_INITED:
3104         case I40IW_CM_STATE_CLOSED:
3105         case I40IW_CM_STATE_LISTENER_DESTROYED:
3106                 i40iw_rem_ref_cm_node(cm_node);
3107                 break;
3108         case I40IW_CM_STATE_OFFLOADED:
3109                 if (cm_node->send_entry)
3110                         i40iw_pr_err("send_entry\n");
3111                 i40iw_rem_ref_cm_node(cm_node);
3112                 break;
3113         }
3114         return ret;
3115 }
3116 
3117 /**
3118  * i40iw_receive_ilq - recv an ETHERNET packet, and process it
3119  * through CM
3120  * @vsi: pointer to the vsi structure
3121  * @rbuf: receive buffer
3122  */
3123 void i40iw_receive_ilq(struct i40iw_sc_vsi *vsi, struct i40iw_puda_buf *rbuf)
3124 {
3125         struct i40iw_cm_node *cm_node;
3126         struct i40iw_cm_listener *listener;
3127         struct iphdr *iph;
3128         struct ipv6hdr *ip6h;
3129         struct tcphdr *tcph;
3130         struct i40iw_cm_info cm_info;
3131         struct i40iw_sc_dev *dev = vsi->dev;
3132         struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
3133         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3134         struct vlan_ethhdr *ethh;
3135         u16 vtag;
3136 
3137         /* if vlan, then maclen = 18 else 14 */
3138         iph = (struct iphdr *)rbuf->iph;
3139         memset(&cm_info, 0, sizeof(cm_info));
3140 
3141         i40iw_debug_buf(dev,
3142                         I40IW_DEBUG_ILQ,
3143                         "RECEIVE ILQ BUFFER",
3144                         rbuf->mem.va,
3145                         rbuf->totallen);
3146         ethh = (struct vlan_ethhdr *)rbuf->mem.va;
3147 
3148         if (ethh->h_vlan_proto == htons(ETH_P_8021Q)) {
3149                 vtag = ntohs(ethh->h_vlan_TCI);
3150                 cm_info.user_pri = (vtag & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
3151                 cm_info.vlan_id = vtag & VLAN_VID_MASK;
3152                 i40iw_debug(cm_core->dev,
3153                             I40IW_DEBUG_CM,
3154                             "%s vlan_id=%d\n",
3155                             __func__,
3156                             cm_info.vlan_id);
3157         } else {
3158                 cm_info.vlan_id = I40IW_NO_VLAN;
3159         }
3160         tcph = (struct tcphdr *)rbuf->tcph;
3161 
3162         if (rbuf->ipv4) {
3163                 cm_info.loc_addr[0] = ntohl(iph->daddr);
3164                 cm_info.rem_addr[0] = ntohl(iph->saddr);
3165                 cm_info.ipv4 = true;
3166                 cm_info.tos = iph->tos;
3167         } else {
3168                 ip6h = (struct ipv6hdr *)rbuf->iph;
3169                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3170                                     ip6h->daddr.in6_u.u6_addr32);
3171                 i40iw_copy_ip_ntohl(cm_info.rem_addr,
3172                                     ip6h->saddr.in6_u.u6_addr32);
3173                 cm_info.ipv4 = false;
3174                 cm_info.tos = (ip6h->priority << 4) | (ip6h->flow_lbl[0] >> 4);
3175         }
3176         cm_info.loc_port = ntohs(tcph->dest);
3177         cm_info.rem_port = ntohs(tcph->source);
3178         cm_node = i40iw_find_node(cm_core,
3179                                   cm_info.rem_port,
3180                                   cm_info.rem_addr,
3181                                   cm_info.loc_port,
3182                                   cm_info.loc_addr,
3183                                   true,
3184                                   false);
3185 
3186         if (!cm_node) {
3187                 /* Only type of packet accepted are for */
3188                 /* the PASSIVE open (syn only) */
3189                 if (!tcph->syn || tcph->ack)
3190                         return;
3191                 listener =
3192                     i40iw_find_listener(cm_core,
3193                                         cm_info.loc_addr,
3194                                         cm_info.loc_port,
3195                                         cm_info.vlan_id,
3196                                         I40IW_CM_LISTENER_ACTIVE_STATE);
3197                 if (!listener) {
3198                         cm_info.cm_id = NULL;
3199                         i40iw_debug(cm_core->dev,
3200                                     I40IW_DEBUG_CM,
3201                                     "%s no listener found\n",
3202                                     __func__);
3203                         return;
3204                 }
3205                 cm_info.cm_id = listener->cm_id;
3206                 cm_node = i40iw_make_cm_node(cm_core, iwdev, &cm_info, listener);
3207                 if (!cm_node) {
3208                         i40iw_debug(cm_core->dev,
3209                                     I40IW_DEBUG_CM,
3210                                     "%s allocate node failed\n",
3211                                     __func__);
3212                         atomic_dec(&listener->ref_count);
3213                         return;
3214                 }
3215                 if (!tcph->rst && !tcph->fin) {
3216                         cm_node->state = I40IW_CM_STATE_LISTENING;
3217                 } else {
3218                         i40iw_rem_ref_cm_node(cm_node);
3219                         return;
3220                 }
3221                 atomic_inc(&cm_node->ref_count);
3222         } else if (cm_node->state == I40IW_CM_STATE_OFFLOADED) {
3223                 i40iw_rem_ref_cm_node(cm_node);
3224                 return;
3225         }
3226         i40iw_process_packet(cm_node, rbuf);
3227         i40iw_rem_ref_cm_node(cm_node);
3228 }
3229 
3230 /**
3231  * i40iw_setup_cm_core - allocate a top level instance of a cm
3232  * core
3233  * @iwdev: iwarp device structure
3234  */
3235 int i40iw_setup_cm_core(struct i40iw_device *iwdev)
3236 {
3237         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3238 
3239         cm_core->iwdev = iwdev;
3240         cm_core->dev = &iwdev->sc_dev;
3241 
3242         INIT_LIST_HEAD(&cm_core->accelerated_list);
3243         INIT_LIST_HEAD(&cm_core->non_accelerated_list);
3244         INIT_LIST_HEAD(&cm_core->listen_nodes);
3245 
3246         timer_setup(&cm_core->tcp_timer, i40iw_cm_timer_tick, 0);
3247 
3248         spin_lock_init(&cm_core->ht_lock);
3249         spin_lock_init(&cm_core->listen_list_lock);
3250         spin_lock_init(&cm_core->apbvt_lock);
3251 
3252         cm_core->event_wq = alloc_ordered_workqueue("iwewq",
3253                                                     WQ_MEM_RECLAIM);
3254         if (!cm_core->event_wq)
3255                 goto error;
3256 
3257         cm_core->disconn_wq = alloc_ordered_workqueue("iwdwq",
3258                                                       WQ_MEM_RECLAIM);
3259         if (!cm_core->disconn_wq)
3260                 goto error;
3261 
3262         return 0;
3263 error:
3264         i40iw_cleanup_cm_core(&iwdev->cm_core);
3265 
3266         return -ENOMEM;
3267 }
3268 
3269 /**
3270  * i40iw_cleanup_cm_core - deallocate a top level instance of a
3271  * cm core
3272  * @cm_core: cm's core
3273  */
3274 void i40iw_cleanup_cm_core(struct i40iw_cm_core *cm_core)
3275 {
3276         unsigned long flags;
3277 
3278         if (!cm_core)
3279                 return;
3280 
3281         spin_lock_irqsave(&cm_core->ht_lock, flags);
3282         if (timer_pending(&cm_core->tcp_timer))
3283                 del_timer_sync(&cm_core->tcp_timer);
3284         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
3285 
3286         if (cm_core->event_wq)
3287                 destroy_workqueue(cm_core->event_wq);
3288         if (cm_core->disconn_wq)
3289                 destroy_workqueue(cm_core->disconn_wq);
3290 }
3291 
3292 /**
3293  * i40iw_init_tcp_ctx - setup qp context
3294  * @cm_node: connection's node
3295  * @tcp_info: offload info for tcp
3296  * @iwqp: associate qp for the connection
3297  */
3298 static void i40iw_init_tcp_ctx(struct i40iw_cm_node *cm_node,
3299                                struct i40iw_tcp_offload_info *tcp_info,
3300                                struct i40iw_qp *iwqp)
3301 {
3302         tcp_info->ipv4 = cm_node->ipv4;
3303         tcp_info->drop_ooo_seg = true;
3304         tcp_info->wscale = true;
3305         tcp_info->ignore_tcp_opt = true;
3306         tcp_info->ignore_tcp_uns_opt = true;
3307         tcp_info->no_nagle = false;
3308 
3309         tcp_info->ttl = I40IW_DEFAULT_TTL;
3310         tcp_info->rtt_var = cpu_to_le32(I40IW_DEFAULT_RTT_VAR);
3311         tcp_info->ss_thresh = cpu_to_le32(I40IW_DEFAULT_SS_THRESH);
3312         tcp_info->rexmit_thresh = I40IW_DEFAULT_REXMIT_THRESH;
3313 
3314         tcp_info->tcp_state = I40IW_TCP_STATE_ESTABLISHED;
3315         tcp_info->snd_wscale = cm_node->tcp_cntxt.snd_wscale;
3316         tcp_info->rcv_wscale = cm_node->tcp_cntxt.rcv_wscale;
3317 
3318         tcp_info->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3319         tcp_info->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
3320         tcp_info->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
3321         tcp_info->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3322 
3323         tcp_info->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3324         tcp_info->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
3325         tcp_info->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
3326         tcp_info->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
3327         tcp_info->max_snd_window = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
3328         tcp_info->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
3329                                         cm_node->tcp_cntxt.rcv_wscale);
3330 
3331         tcp_info->flow_label = 0;
3332         tcp_info->snd_mss = cpu_to_le32(((u32)cm_node->tcp_cntxt.mss));
3333         if (cm_node->vlan_id <= VLAN_VID_MASK) {
3334                 tcp_info->insert_vlan_tag = true;
3335                 tcp_info->vlan_tag = cpu_to_le16(((u16)cm_node->user_pri << I40IW_VLAN_PRIO_SHIFT) |
3336                                                   cm_node->vlan_id);
3337         }
3338         if (cm_node->ipv4) {
3339                 tcp_info->src_port = cpu_to_le16(cm_node->loc_port);
3340                 tcp_info->dst_port = cpu_to_le16(cm_node->rem_port);
3341 
3342                 tcp_info->dest_ip_addr3 = cpu_to_le32(cm_node->rem_addr[0]);
3343                 tcp_info->local_ipaddr3 = cpu_to_le32(cm_node->loc_addr[0]);
3344                 tcp_info->arp_idx =
3345                         cpu_to_le16((u16)i40iw_arp_table(
3346                                                          iwqp->iwdev,
3347                                                          &tcp_info->dest_ip_addr3,
3348                                                          true,
3349                                                          NULL,
3350                                                          I40IW_ARP_RESOLVE));
3351         } else {
3352                 tcp_info->src_port = cpu_to_le16(cm_node->loc_port);
3353                 tcp_info->dst_port = cpu_to_le16(cm_node->rem_port);
3354                 tcp_info->dest_ip_addr0 = cpu_to_le32(cm_node->rem_addr[0]);
3355                 tcp_info->dest_ip_addr1 = cpu_to_le32(cm_node->rem_addr[1]);
3356                 tcp_info->dest_ip_addr2 = cpu_to_le32(cm_node->rem_addr[2]);
3357                 tcp_info->dest_ip_addr3 = cpu_to_le32(cm_node->rem_addr[3]);
3358                 tcp_info->local_ipaddr0 = cpu_to_le32(cm_node->loc_addr[0]);
3359                 tcp_info->local_ipaddr1 = cpu_to_le32(cm_node->loc_addr[1]);
3360                 tcp_info->local_ipaddr2 = cpu_to_le32(cm_node->loc_addr[2]);
3361                 tcp_info->local_ipaddr3 = cpu_to_le32(cm_node->loc_addr[3]);
3362                 tcp_info->arp_idx =
3363                         cpu_to_le16((u16)i40iw_arp_table(
3364                                                          iwqp->iwdev,
3365                                                          &tcp_info->dest_ip_addr0,
3366                                                          false,
3367                                                          NULL,
3368                                                          I40IW_ARP_RESOLVE));
3369         }
3370 }
3371 
3372 /**
3373  * i40iw_cm_init_tsa_conn - setup qp for RTS
3374  * @iwqp: associate qp for the connection
3375  * @cm_node: connection's node
3376  */
3377 static void i40iw_cm_init_tsa_conn(struct i40iw_qp *iwqp,
3378                                    struct i40iw_cm_node *cm_node)
3379 {
3380         struct i40iw_tcp_offload_info tcp_info;
3381         struct i40iwarp_offload_info *iwarp_info;
3382         struct i40iw_qp_host_ctx_info *ctx_info;
3383         struct i40iw_device *iwdev = iwqp->iwdev;
3384         struct i40iw_sc_dev *dev = &iwqp->iwdev->sc_dev;
3385 
3386         memset(&tcp_info, 0x00, sizeof(struct i40iw_tcp_offload_info));
3387         iwarp_info = &iwqp->iwarp_info;
3388         ctx_info = &iwqp->ctx_info;
3389 
3390         ctx_info->tcp_info = &tcp_info;
3391         ctx_info->send_cq_num = iwqp->iwscq->sc_cq.cq_uk.cq_id;
3392         ctx_info->rcv_cq_num = iwqp->iwrcq->sc_cq.cq_uk.cq_id;
3393 
3394         iwarp_info->ord_size = cm_node->ord_size;
3395         iwarp_info->ird_size = i40iw_derive_hw_ird_setting(cm_node->ird_size);
3396 
3397         if (iwarp_info->ord_size == 1)
3398                 iwarp_info->ord_size = 2;
3399 
3400         iwarp_info->rd_enable = true;
3401         iwarp_info->rdmap_ver = 1;
3402         iwarp_info->ddp_ver = 1;
3403 
3404         iwarp_info->pd_id = iwqp->iwpd->sc_pd.pd_id;
3405 
3406         ctx_info->tcp_info_valid = true;
3407         ctx_info->iwarp_info_valid = true;
3408         ctx_info->add_to_qoslist = true;
3409         ctx_info->user_pri = cm_node->user_pri;
3410 
3411         i40iw_init_tcp_ctx(cm_node, &tcp_info, iwqp);
3412         if (cm_node->snd_mark_en) {
3413                 iwarp_info->snd_mark_en = true;
3414                 iwarp_info->snd_mark_offset = (tcp_info.snd_nxt &
3415                                 SNDMARKER_SEQNMASK) + cm_node->lsmm_size;
3416         }
3417 
3418         cm_node->state = I40IW_CM_STATE_OFFLOADED;
3419         tcp_info.tcp_state = I40IW_TCP_STATE_ESTABLISHED;
3420         tcp_info.src_mac_addr_idx = iwdev->mac_ip_table_idx;
3421         tcp_info.tos = cm_node->tos;
3422 
3423         dev->iw_priv_qp_ops->qp_setctx(&iwqp->sc_qp, (u64 *)(iwqp->host_ctx.va), ctx_info);
3424 
3425         /* once tcp_info is set, no need to do it again */
3426         ctx_info->tcp_info_valid = false;
3427         ctx_info->iwarp_info_valid = false;
3428         ctx_info->add_to_qoslist = false;
3429 }
3430 
3431 /**
3432  * i40iw_cm_disconn - when a connection is being closed
3433  * @iwqp: associate qp for the connection
3434  */
3435 void i40iw_cm_disconn(struct i40iw_qp *iwqp)
3436 {
3437         struct disconn_work *work;
3438         struct i40iw_device *iwdev = iwqp->iwdev;
3439         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
3440         unsigned long flags;
3441 
3442         work = kzalloc(sizeof(*work), GFP_ATOMIC);
3443         if (!work)
3444                 return; /* Timer will clean up */
3445 
3446         spin_lock_irqsave(&iwdev->qptable_lock, flags);
3447         if (!iwdev->qp_table[iwqp->ibqp.qp_num]) {
3448                 spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
3449                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
3450                             "%s qp_id %d is already freed\n",
3451                              __func__, iwqp->ibqp.qp_num);
3452                 kfree(work);
3453                 return;
3454         }
3455         i40iw_add_ref(&iwqp->ibqp);
3456         spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
3457 
3458         work->iwqp = iwqp;
3459         INIT_WORK(&work->work, i40iw_disconnect_worker);
3460         queue_work(cm_core->disconn_wq, &work->work);
3461         return;
3462 }
3463 
3464 /**
3465  * i40iw_qp_disconnect - free qp and close cm
3466  * @iwqp: associate qp for the connection
3467  */
3468 static void i40iw_qp_disconnect(struct i40iw_qp *iwqp)
3469 {
3470         struct i40iw_device *iwdev;
3471         struct i40iw_ib_device *iwibdev;
3472 
3473         iwdev = to_iwdev(iwqp->ibqp.device);
3474         if (!iwdev) {
3475                 i40iw_pr_err("iwdev == NULL\n");
3476                 return;
3477         }
3478 
3479         iwibdev = iwdev->iwibdev;
3480 
3481         if (iwqp->active_conn) {
3482                 /* indicate this connection is NOT active */
3483                 iwqp->active_conn = 0;
3484         } else {
3485                 /* Need to free the Last Streaming Mode Message */
3486                 if (iwqp->ietf_mem.va) {
3487                         if (iwqp->lsmm_mr)
3488                                 iwibdev->ibdev.ops.dereg_mr(iwqp->lsmm_mr,
3489                                                             NULL);
3490                         i40iw_free_dma_mem(iwdev->sc_dev.hw, &iwqp->ietf_mem);
3491                 }
3492         }
3493 
3494         /* close the CM node down if it is still active */
3495         if (iwqp->cm_node) {
3496                 i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM, "%s Call close API\n", __func__);
3497                 i40iw_cm_close(iwqp->cm_node);
3498         }
3499 }
3500 
3501 /**
3502  * i40iw_cm_disconn_true - called by worker thread to disconnect qp
3503  * @iwqp: associate qp for the connection
3504  */
3505 static void i40iw_cm_disconn_true(struct i40iw_qp *iwqp)
3506 {
3507         struct iw_cm_id *cm_id;
3508         struct i40iw_device *iwdev;
3509         struct i40iw_sc_qp *qp = &iwqp->sc_qp;
3510         u16 last_ae;
3511         u8 original_hw_tcp_state;
3512         u8 original_ibqp_state;
3513         int disconn_status = 0;
3514         int issue_disconn = 0;
3515         int issue_close = 0;
3516         int issue_flush = 0;
3517         struct ib_event ibevent;
3518         unsigned long flags;
3519         int ret;
3520 
3521         if (!iwqp) {
3522                 i40iw_pr_err("iwqp == NULL\n");
3523                 return;
3524         }
3525 
3526         spin_lock_irqsave(&iwqp->lock, flags);
3527         cm_id = iwqp->cm_id;
3528         /* make sure we havent already closed this connection */
3529         if (!cm_id) {
3530                 spin_unlock_irqrestore(&iwqp->lock, flags);
3531                 return;
3532         }
3533 
3534         iwdev = to_iwdev(iwqp->ibqp.device);
3535 
3536         original_hw_tcp_state = iwqp->hw_tcp_state;
3537         original_ibqp_state = iwqp->ibqp_state;
3538         last_ae = iwqp->last_aeq;
3539 
3540         if (qp->term_flags) {
3541                 issue_disconn = 1;
3542                 issue_close = 1;
3543                 iwqp->cm_id = NULL;
3544                 /*When term timer expires after cm_timer, don't want
3545                  *terminate-handler to issue cm_disconn which can re-free
3546                  *a QP even after its refcnt=0.
3547                  */
3548                 i40iw_terminate_del_timer(qp);
3549                 if (!iwqp->flush_issued) {
3550                         iwqp->flush_issued = 1;
3551                         issue_flush = 1;
3552                 }
3553         } else if ((original_hw_tcp_state == I40IW_TCP_STATE_CLOSE_WAIT) ||
3554                    ((original_ibqp_state == IB_QPS_RTS) &&
3555                     (last_ae == I40IW_AE_LLP_CONNECTION_RESET))) {
3556                 issue_disconn = 1;
3557                 if (last_ae == I40IW_AE_LLP_CONNECTION_RESET)
3558                         disconn_status = -ECONNRESET;
3559         }
3560 
3561         if (((original_hw_tcp_state == I40IW_TCP_STATE_CLOSED) ||
3562              (original_hw_tcp_state == I40IW_TCP_STATE_TIME_WAIT) ||
3563              (last_ae == I40IW_AE_RDMAP_ROE_BAD_LLP_CLOSE) ||
3564              (last_ae == I40IW_AE_LLP_CONNECTION_RESET) ||
3565               iwdev->reset)) {
3566                 issue_close = 1;
3567                 iwqp->cm_id = NULL;
3568                 if (!iwqp->flush_issued) {
3569                         iwqp->flush_issued = 1;
3570                         issue_flush = 1;
3571                 }
3572         }
3573 
3574         spin_unlock_irqrestore(&iwqp->lock, flags);
3575         if (issue_flush && !iwqp->destroyed) {
3576                 /* Flush the queues */
3577                 i40iw_flush_wqes(iwdev, iwqp);
3578 
3579                 if (qp->term_flags && iwqp->ibqp.event_handler) {
3580                         ibevent.device = iwqp->ibqp.device;
3581                         ibevent.event = (qp->eventtype == TERM_EVENT_QP_FATAL) ?
3582                                         IB_EVENT_QP_FATAL : IB_EVENT_QP_ACCESS_ERR;
3583                         ibevent.element.qp = &iwqp->ibqp;
3584                         iwqp->ibqp.event_handler(&ibevent, iwqp->ibqp.qp_context);
3585                 }
3586         }
3587 
3588         if (cm_id && cm_id->event_handler) {
3589                 if (issue_disconn) {
3590                         ret = i40iw_send_cm_event(NULL,
3591                                                   cm_id,
3592                                                   IW_CM_EVENT_DISCONNECT,
3593                                                   disconn_status);
3594 
3595                         if (ret)
3596                                 i40iw_debug(&iwdev->sc_dev,
3597                                             I40IW_DEBUG_CM,
3598                                             "disconnect event failed %s: - cm_id = %p\n",
3599                                             __func__, cm_id);
3600                 }
3601                 if (issue_close) {
3602                         i40iw_qp_disconnect(iwqp);
3603                         cm_id->provider_data = iwqp;
3604                         ret = i40iw_send_cm_event(NULL, cm_id, IW_CM_EVENT_CLOSE, 0);
3605                         if (ret)
3606                                 i40iw_debug(&iwdev->sc_dev,
3607                                             I40IW_DEBUG_CM,
3608                                             "close event failed %s: - cm_id = %p\n",
3609                                             __func__, cm_id);
3610                         cm_id->rem_ref(cm_id);
3611                 }
3612         }
3613 }
3614 
3615 /**
3616  * i40iw_disconnect_worker - worker for connection close
3617  * @work: points or disconn structure
3618  */
3619 static void i40iw_disconnect_worker(struct work_struct *work)
3620 {
3621         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
3622         struct i40iw_qp *iwqp = dwork->iwqp;
3623 
3624         kfree(dwork);
3625         i40iw_cm_disconn_true(iwqp);
3626         i40iw_rem_ref(&iwqp->ibqp);
3627 }
3628 
3629 /**
3630  * i40iw_accept - registered call for connection to be accepted
3631  * @cm_id: cm information for passive connection
3632  * @conn_param: accpet parameters
3633  */
3634 int i40iw_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3635 {
3636         struct ib_qp *ibqp;
3637         struct i40iw_qp *iwqp;
3638         struct i40iw_device *iwdev;
3639         struct i40iw_sc_dev *dev;
3640         struct i40iw_cm_core *cm_core;
3641         struct i40iw_cm_node *cm_node;
3642         struct ib_qp_attr attr;
3643         int passive_state;
3644         struct ib_mr *ibmr;
3645         struct i40iw_pd *iwpd;
3646         u16 buf_len = 0;
3647         struct i40iw_kmem_info accept;
3648         enum i40iw_status_code status;
3649         u64 tagged_offset;
3650         unsigned long flags;
3651 
3652         memset(&attr, 0, sizeof(attr));
3653         ibqp = i40iw_get_qp(cm_id->device, conn_param->qpn);
3654         if (!ibqp)
3655                 return -EINVAL;
3656 
3657         iwqp = to_iwqp(ibqp);
3658         iwdev = iwqp->iwdev;
3659         dev = &iwdev->sc_dev;
3660         cm_core = &iwdev->cm_core;
3661         cm_node = (struct i40iw_cm_node *)cm_id->provider_data;
3662 
3663         if (((struct sockaddr_in *)&cm_id->local_addr)->sin_family == AF_INET) {
3664                 cm_node->ipv4 = true;
3665                 cm_node->vlan_id = i40iw_get_vlan_ipv4(cm_node->loc_addr);
3666         } else {
3667                 cm_node->ipv4 = false;
3668                 i40iw_netdev_vlan_ipv6(cm_node->loc_addr, &cm_node->vlan_id);
3669         }
3670         i40iw_debug(cm_node->dev,
3671                     I40IW_DEBUG_CM,
3672                     "Accept vlan_id=%d\n",
3673                     cm_node->vlan_id);
3674         if (cm_node->state == I40IW_CM_STATE_LISTENER_DESTROYED) {
3675                 if (cm_node->loopbackpartner)
3676                         i40iw_rem_ref_cm_node(cm_node->loopbackpartner);
3677                 i40iw_rem_ref_cm_node(cm_node);
3678                 return -EINVAL;
3679         }
3680 
3681         passive_state = atomic_add_return(1, &cm_node->passive_state);
3682         if (passive_state == I40IW_SEND_RESET_EVENT) {
3683                 i40iw_rem_ref_cm_node(cm_node);
3684                 return -ECONNRESET;
3685         }
3686 
3687         cm_node->cm_core->stats_accepts++;
3688         iwqp->cm_node = (void *)cm_node;
3689         cm_node->iwqp = iwqp;
3690 
3691         buf_len = conn_param->private_data_len + I40IW_MAX_IETF_SIZE;
3692 
3693         status = i40iw_allocate_dma_mem(dev->hw, &iwqp->ietf_mem, buf_len, 1);
3694 
3695         if (status)
3696                 return -ENOMEM;
3697         cm_node->pdata.size = conn_param->private_data_len;
3698         accept.addr = iwqp->ietf_mem.va;
3699         accept.size = i40iw_cm_build_mpa_frame(cm_node, &accept, MPA_KEY_REPLY);
3700         memcpy(accept.addr + accept.size, conn_param->private_data,
3701                conn_param->private_data_len);
3702 
3703         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3704         if ((cm_node->ipv4 &&
3705              !i40iw_ipv4_is_loopback(cm_node->loc_addr[0], cm_node->rem_addr[0])) ||
3706             (!cm_node->ipv4 &&
3707              !i40iw_ipv6_is_loopback(cm_node->loc_addr, cm_node->rem_addr))) {
3708                 iwpd = iwqp->iwpd;
3709                 tagged_offset = (uintptr_t)iwqp->ietf_mem.va;
3710                 ibmr = i40iw_reg_phys_mr(&iwpd->ibpd,
3711                                          iwqp->ietf_mem.pa,
3712                                          buf_len,
3713                                          IB_ACCESS_LOCAL_WRITE,
3714                                          &tagged_offset);
3715                 if (IS_ERR(ibmr)) {
3716                         i40iw_free_dma_mem(dev->hw, &iwqp->ietf_mem);
3717                         return -ENOMEM;
3718                 }
3719 
3720                 ibmr->pd = &iwpd->ibpd;
3721                 ibmr->device = iwpd->ibpd.device;
3722                 iwqp->lsmm_mr = ibmr;
3723                 if (iwqp->page)
3724                         iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
3725                 dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp,
3726                                                         iwqp->ietf_mem.va,
3727                                                         (accept.size + conn_param->private_data_len),
3728                                                         ibmr->lkey);
3729 
3730         } else {
3731                 if (iwqp->page)
3732                         iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
3733                 dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp, NULL, 0, 0);
3734         }
3735 
3736         if (iwqp->page)
3737                 kunmap(iwqp->page);
3738 
3739         iwqp->cm_id = cm_id;
3740         cm_node->cm_id = cm_id;
3741 
3742         cm_id->provider_data = (void *)iwqp;
3743         iwqp->active_conn = 0;
3744 
3745         cm_node->lsmm_size = accept.size + conn_param->private_data_len;
3746         i40iw_cm_init_tsa_conn(iwqp, cm_node);
3747         cm_id->add_ref(cm_id);
3748         i40iw_add_ref(&iwqp->ibqp);
3749 
3750         attr.qp_state = IB_QPS_RTS;
3751         cm_node->qhash_set = false;
3752         i40iw_modify_qp(&iwqp->ibqp, &attr, IB_QP_STATE, NULL);
3753 
3754         cm_node->accelerated = true;
3755         spin_lock_irqsave(&cm_core->ht_lock, flags);
3756         list_move_tail(&cm_node->list, &cm_core->accelerated_list);
3757         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
3758 
3759         status =
3760                 i40iw_send_cm_event(cm_node, cm_id, IW_CM_EVENT_ESTABLISHED, 0);
3761         if (status)
3762                 i40iw_debug(dev, I40IW_DEBUG_CM, "error sending cm event - ESTABLISHED\n");
3763 
3764         if (cm_node->loopbackpartner) {
3765                 cm_node->loopbackpartner->pdata.size = conn_param->private_data_len;
3766 
3767                 /* copy entire MPA frame to our cm_node's frame */
3768                 memcpy(cm_node->loopbackpartner->pdata_buf,
3769                        conn_param->private_data,
3770                        conn_param->private_data_len);
3771                 i40iw_create_event(cm_node->loopbackpartner, I40IW_CM_EVENT_CONNECTED);
3772         }
3773 
3774         if (cm_node->accept_pend) {
3775                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
3776                 cm_node->accept_pend = 0;
3777         }
3778         return 0;
3779 }
3780 
3781 /**
3782  * i40iw_reject - registered call for connection to be rejected
3783  * @cm_id: cm information for passive connection
3784  * @pdata: private data to be sent
3785  * @pdata_len: private data length
3786  */
3787 int i40iw_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3788 {
3789         struct i40iw_device *iwdev;
3790         struct i40iw_cm_node *cm_node;
3791         struct i40iw_cm_node *loopback;
3792 
3793         cm_node = (struct i40iw_cm_node *)cm_id->provider_data;
3794         loopback = cm_node->loopbackpartner;
3795         cm_node->cm_id = cm_id;
3796         cm_node->pdata.size = pdata_len;
3797 
3798         iwdev = to_iwdev(cm_id->device);
3799         if (!iwdev)
3800                 return -EINVAL;
3801         cm_node->cm_core->stats_rejects++;
3802 
3803         if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3804                 return -EINVAL;
3805 
3806         if (loopback) {
3807                 memcpy(&loopback->pdata_buf, pdata, pdata_len);
3808                 loopback->pdata.size = pdata_len;
3809         }
3810 
3811         return i40iw_cm_reject(cm_node, pdata, pdata_len);
3812 }
3813 
3814 /**
3815  * i40iw_connect - registered call for connection to be established
3816  * @cm_id: cm information for passive connection
3817  * @conn_param: Information about the connection
3818  */
3819 int i40iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3820 {
3821         struct ib_qp *ibqp;
3822         struct i40iw_qp *iwqp;
3823         struct i40iw_device *iwdev;
3824         struct i40iw_cm_node *cm_node;
3825         struct i40iw_cm_info cm_info;
3826         struct sockaddr_in *laddr;
3827         struct sockaddr_in *raddr;
3828         struct sockaddr_in6 *laddr6;
3829         struct sockaddr_in6 *raddr6;
3830         int ret = 0;
3831 
3832         ibqp = i40iw_get_qp(cm_id->device, conn_param->qpn);
3833         if (!ibqp)
3834                 return -EINVAL;
3835         iwqp = to_iwqp(ibqp);
3836         if (!iwqp)
3837                 return -EINVAL;
3838         iwdev = to_iwdev(iwqp->ibqp.device);
3839         if (!iwdev)
3840                 return -EINVAL;
3841 
3842         laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3843         raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3844         laddr6 = (struct sockaddr_in6 *)&cm_id->m_local_addr;
3845         raddr6 = (struct sockaddr_in6 *)&cm_id->m_remote_addr;
3846 
3847         if (!(laddr->sin_port) || !(raddr->sin_port))
3848                 return -EINVAL;
3849 
3850         iwqp->active_conn = 1;
3851         iwqp->cm_id = NULL;
3852         cm_id->provider_data = iwqp;
3853 
3854         /* set up the connection params for the node */
3855         if (cm_id->remote_addr.ss_family == AF_INET) {
3856                 cm_info.ipv4 = true;
3857                 memset(cm_info.loc_addr, 0, sizeof(cm_info.loc_addr));
3858                 memset(cm_info.rem_addr, 0, sizeof(cm_info.rem_addr));
3859                 cm_info.loc_addr[0] = ntohl(laddr->sin_addr.s_addr);
3860                 cm_info.rem_addr[0] = ntohl(raddr->sin_addr.s_addr);
3861                 cm_info.loc_port = ntohs(laddr->sin_port);
3862                 cm_info.rem_port = ntohs(raddr->sin_port);
3863                 cm_info.vlan_id = i40iw_get_vlan_ipv4(cm_info.loc_addr);
3864         } else {
3865                 cm_info.ipv4 = false;
3866                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3867                                     laddr6->sin6_addr.in6_u.u6_addr32);
3868                 i40iw_copy_ip_ntohl(cm_info.rem_addr,
3869                                     raddr6->sin6_addr.in6_u.u6_addr32);
3870                 cm_info.loc_port = ntohs(laddr6->sin6_port);
3871                 cm_info.rem_port = ntohs(raddr6->sin6_port);
3872                 i40iw_netdev_vlan_ipv6(cm_info.loc_addr, &cm_info.vlan_id);
3873         }
3874         cm_info.cm_id = cm_id;
3875         cm_info.tos = cm_id->tos;
3876         cm_info.user_pri = rt_tos2priority(cm_id->tos);
3877         i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_DCB, "%s TOS:[%d] UP:[%d]\n",
3878                     __func__, cm_id->tos, cm_info.user_pri);
3879         cm_id->add_ref(cm_id);
3880         cm_node = i40iw_create_cm_node(&iwdev->cm_core, iwdev,
3881                                        conn_param, &cm_info);
3882 
3883         if (IS_ERR(cm_node)) {
3884                 ret = PTR_ERR(cm_node);
3885                 cm_id->rem_ref(cm_id);
3886                 return ret;
3887         }
3888 
3889         if ((cm_info.ipv4 && (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr)) ||
3890             (!cm_info.ipv4 && memcmp(laddr6->sin6_addr.in6_u.u6_addr32,
3891                                      raddr6->sin6_addr.in6_u.u6_addr32,
3892                                      sizeof(laddr6->sin6_addr.in6_u.u6_addr32)))) {
3893                 if (i40iw_manage_qhash(iwdev, &cm_info, I40IW_QHASH_TYPE_TCP_ESTABLISHED,
3894                                        I40IW_QHASH_MANAGE_TYPE_ADD, NULL, true)) {
3895                         ret = -EINVAL;
3896                         goto err;
3897                 }
3898                 cm_node->qhash_set = true;
3899         }
3900 
3901         if (i40iw_manage_apbvt(iwdev, cm_info.loc_port,
3902                                I40IW_MANAGE_APBVT_ADD)) {
3903                 ret =  -EINVAL;
3904                 goto err;
3905         }
3906 
3907         cm_node->apbvt_set = true;
3908         iwqp->cm_node = cm_node;
3909         cm_node->iwqp = iwqp;
3910         iwqp->cm_id = cm_id;
3911         i40iw_add_ref(&iwqp->ibqp);
3912 
3913         if (cm_node->state != I40IW_CM_STATE_OFFLOADED) {
3914                 cm_node->state = I40IW_CM_STATE_SYN_SENT;
3915                 ret = i40iw_send_syn(cm_node, 0);
3916                 if (ret)
3917                         goto err;
3918         }
3919 
3920         if (cm_node->loopbackpartner) {
3921                 cm_node->loopbackpartner->state = I40IW_CM_STATE_MPAREQ_RCVD;
3922                 i40iw_create_event(cm_node->loopbackpartner,
3923                                    I40IW_CM_EVENT_MPA_REQ);
3924         }
3925 
3926         i40iw_debug(cm_node->dev,
3927                     I40IW_DEBUG_CM,
3928                     "Api - connect(): port=0x%04x, cm_node=%p, cm_id = %p.\n",
3929                     cm_node->rem_port,
3930                     cm_node,
3931                     cm_node->cm_id);
3932 
3933         return 0;
3934 
3935 err:
3936         if (cm_info.ipv4)
3937                 i40iw_debug(&iwdev->sc_dev,
3938                             I40IW_DEBUG_CM,
3939                             "Api - connect() FAILED: dest addr=%pI4",
3940                             cm_info.rem_addr);
3941         else
3942                 i40iw_debug(&iwdev->sc_dev,
3943                             I40IW_DEBUG_CM,
3944                             "Api - connect() FAILED: dest addr=%pI6",
3945                             cm_info.rem_addr);
3946 
3947         i40iw_rem_ref_cm_node(cm_node);
3948         cm_id->rem_ref(cm_id);
3949         iwdev->cm_core.stats_connect_errs++;
3950         return ret;
3951 }
3952 
3953 /**
3954  * i40iw_create_listen - registered call creating listener
3955  * @cm_id: cm information for passive connection
3956  * @backlog: to max accept pending count
3957  */
3958 int i40iw_create_listen(struct iw_cm_id *cm_id, int backlog)
3959 {
3960         struct i40iw_device *iwdev;
3961         struct i40iw_cm_listener *cm_listen_node;
3962         struct i40iw_cm_info cm_info;
3963         enum i40iw_status_code ret;
3964         struct sockaddr_in *laddr;
3965         struct sockaddr_in6 *laddr6;
3966         bool wildcard = false;
3967 
3968         iwdev = to_iwdev(cm_id->device);
3969         if (!iwdev)
3970                 return -EINVAL;
3971 
3972         laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3973         laddr6 = (struct sockaddr_in6 *)&cm_id->m_local_addr;
3974         memset(&cm_info, 0, sizeof(cm_info));
3975         if (laddr->sin_family == AF_INET) {
3976                 cm_info.ipv4 = true;
3977                 cm_info.loc_addr[0] = ntohl(laddr->sin_addr.s_addr);
3978                 cm_info.loc_port = ntohs(laddr->sin_port);
3979 
3980                 if (laddr->sin_addr.s_addr != INADDR_ANY)
3981                         cm_info.vlan_id = i40iw_get_vlan_ipv4(cm_info.loc_addr);
3982                 else
3983                         wildcard = true;
3984 
3985         } else {
3986                 cm_info.ipv4 = false;
3987                 i40iw_copy_ip_ntohl(cm_info.loc_addr,
3988                                     laddr6->sin6_addr.in6_u.u6_addr32);
3989                 cm_info.loc_port = ntohs(laddr6->sin6_port);
3990                 if (ipv6_addr_type(&laddr6->sin6_addr) != IPV6_ADDR_ANY)
3991                         i40iw_netdev_vlan_ipv6(cm_info.loc_addr,
3992                                                &cm_info.vlan_id);
3993                 else
3994                         wildcard = true;
3995         }
3996         cm_info.backlog = backlog;
3997         cm_info.cm_id = cm_id;
3998 
3999         cm_listen_node = i40iw_make_listen_node(&iwdev->cm_core, iwdev, &cm_info);
4000         if (!cm_listen_node) {
4001                 i40iw_pr_err("cm_listen_node == NULL\n");
4002                 return -ENOMEM;
4003         }
4004 
4005         cm_id->provider_data = cm_listen_node;
4006 
4007         cm_listen_node->tos = cm_id->tos;
4008         cm_listen_node->user_pri = rt_tos2priority(cm_id->tos);
4009         cm_info.user_pri = cm_listen_node->user_pri;
4010 
4011         if (!cm_listen_node->reused_node) {
4012                 if (wildcard) {
4013                         if (cm_info.ipv4)
4014                                 ret = i40iw_add_mqh_4(iwdev,
4015                                                       &cm_info,
4016                                                       cm_listen_node);
4017                         else
4018                                 ret = i40iw_add_mqh_6(iwdev,
4019                                                       &cm_info,
4020                                                       cm_listen_node);
4021                         if (ret)
4022                                 goto error;
4023 
4024                         ret = i40iw_manage_apbvt(iwdev,
4025                                                  cm_info.loc_port,
4026                                                  I40IW_MANAGE_APBVT_ADD);
4027 
4028                         if (ret)
4029                                 goto error;
4030                 } else {
4031                         ret = i40iw_manage_qhash(iwdev,
4032                                                  &cm_info,
4033                                                  I40IW_QHASH_TYPE_TCP_SYN,
4034                                                  I40IW_QHASH_MANAGE_TYPE_ADD,
4035                                                  NULL,
4036                                                  true);
4037                         if (ret)
4038                                 goto error;
4039                         cm_listen_node->qhash_set = true;
4040                         ret = i40iw_manage_apbvt(iwdev,
4041                                                  cm_info.loc_port,
4042                                                  I40IW_MANAGE_APBVT_ADD);
4043                         if (ret)
4044                                 goto error;
4045                 }
4046         }
4047         cm_id->add_ref(cm_id);
4048         cm_listen_node->cm_core->stats_listen_created++;
4049         return 0;
4050  error:
4051         i40iw_cm_del_listen(&iwdev->cm_core, (void *)cm_listen_node, false);
4052         return -EINVAL;
4053 }
4054 
4055 /**
4056  * i40iw_destroy_listen - registered call to destroy listener
4057  * @cm_id: cm information for passive connection
4058  */
4059 int i40iw_destroy_listen(struct iw_cm_id *cm_id)
4060 {
4061         struct i40iw_device *iwdev;
4062 
4063         iwdev = to_iwdev(cm_id->device);
4064         if (cm_id->provider_data)
4065                 i40iw_cm_del_listen(&iwdev->cm_core, cm_id->provider_data, true);
4066         else
4067                 i40iw_pr_err("cm_id->provider_data was NULL\n");
4068 
4069         cm_id->rem_ref(cm_id);
4070 
4071         return 0;
4072 }
4073 
4074 /**
4075  * i40iw_cm_event_connected - handle connected active node
4076  * @event: the info for cm_node of connection
4077  */
4078 static void i40iw_cm_event_connected(struct i40iw_cm_event *event)
4079 {
4080         struct i40iw_qp *iwqp;
4081         struct i40iw_device *iwdev;
4082         struct i40iw_cm_core *cm_core;
4083         struct i40iw_cm_node *cm_node;
4084         struct i40iw_sc_dev *dev;
4085         struct ib_qp_attr attr;
4086         struct iw_cm_id *cm_id;
4087         unsigned long flags;
4088         int status;
4089         bool read0;
4090 
4091         cm_node = event->cm_node;
4092         cm_id = cm_node->cm_id;
4093         iwqp = (struct i40iw_qp *)cm_id->provider_data;
4094         iwdev = to_iwdev(iwqp->ibqp.device);
4095         dev = &iwdev->sc_dev;
4096         cm_core = &iwdev->cm_core;
4097 
4098         if (iwqp->destroyed) {
4099                 status = -ETIMEDOUT;
4100                 goto error;
4101         }
4102         i40iw_cm_init_tsa_conn(iwqp, cm_node);
4103         read0 = (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO);
4104         if (iwqp->page)
4105                 iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
4106         dev->iw_priv_qp_ops->qp_send_rtt(&iwqp->sc_qp, read0);
4107         if (iwqp->page)
4108                 kunmap(iwqp->page);
4109 
4110         memset(&attr, 0, sizeof(attr));
4111         attr.qp_state = IB_QPS_RTS;
4112         cm_node->qhash_set = false;
4113         i40iw_modify_qp(&iwqp->ibqp, &attr, IB_QP_STATE, NULL);
4114 
4115         cm_node->accelerated = true;
4116         spin_lock_irqsave(&cm_core->ht_lock, flags);
4117         list_move_tail(&cm_node->list, &cm_core->accelerated_list);
4118         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
4119         status = i40iw_send_cm_event(cm_node, cm_id, IW_CM_EVENT_CONNECT_REPLY,
4120                                      0);
4121         if (status)
4122                 i40iw_debug(dev, I40IW_DEBUG_CM, "error sending cm event - CONNECT_REPLY\n");
4123 
4124         return;
4125 
4126 error:
4127         iwqp->cm_id = NULL;
4128         cm_id->provider_data = NULL;
4129         i40iw_send_cm_event(event->cm_node,
4130                             cm_id,
4131                             IW_CM_EVENT_CONNECT_REPLY,
4132                             status);
4133         cm_id->rem_ref(cm_id);
4134         i40iw_rem_ref_cm_node(event->cm_node);
4135 }
4136 
4137 /**
4138  * i40iw_cm_event_reset - handle reset
4139  * @event: the info for cm_node of connection
4140  */
4141 static void i40iw_cm_event_reset(struct i40iw_cm_event *event)
4142 {
4143         struct i40iw_cm_node *cm_node = event->cm_node;
4144         struct iw_cm_id   *cm_id = cm_node->cm_id;
4145         struct i40iw_qp *iwqp;
4146 
4147         if (!cm_id)
4148                 return;
4149 
4150         iwqp = cm_id->provider_data;
4151         if (!iwqp)
4152                 return;
4153 
4154         i40iw_debug(cm_node->dev,
4155                     I40IW_DEBUG_CM,
4156                     "reset event %p - cm_id = %p\n",
4157                      event->cm_node, cm_id);
4158         iwqp->cm_id = NULL;
4159 
4160         i40iw_send_cm_event(cm_node, cm_node->cm_id, IW_CM_EVENT_DISCONNECT, -ECONNRESET);
4161         i40iw_send_cm_event(cm_node, cm_node->cm_id, IW_CM_EVENT_CLOSE, 0);
4162 }
4163 
4164 /**
4165  * i40iw_cm_event_handler - worker thread callback to send event to cm upper layer
4166  * @work: pointer of cm event info.
4167  */
4168 static void i40iw_cm_event_handler(struct work_struct *work)
4169 {
4170         struct i40iw_cm_event *event = container_of(work,
4171                                                     struct i40iw_cm_event,
4172                                                     event_work);
4173         struct i40iw_cm_node *cm_node;
4174 
4175         if (!event || !event->cm_node || !event->cm_node->cm_core)
4176                 return;
4177 
4178         cm_node = event->cm_node;
4179 
4180         switch (event->type) {
4181         case I40IW_CM_EVENT_MPA_REQ:
4182                 i40iw_send_cm_event(cm_node,
4183                                     cm_node->cm_id,
4184                                     IW_CM_EVENT_CONNECT_REQUEST,
4185                                     0);
4186                 break;
4187         case I40IW_CM_EVENT_RESET:
4188                 i40iw_cm_event_reset(event);
4189                 break;
4190         case I40IW_CM_EVENT_CONNECTED:
4191                 if (!event->cm_node->cm_id ||
4192                     (event->cm_node->state != I40IW_CM_STATE_OFFLOADED))
4193                         break;
4194                 i40iw_cm_event_connected(event);
4195                 break;
4196         case I40IW_CM_EVENT_MPA_REJECT:
4197                 if (!event->cm_node->cm_id ||
4198                     (cm_node->state == I40IW_CM_STATE_OFFLOADED))
4199                         break;
4200                 i40iw_send_cm_event(cm_node,
4201                                     cm_node->cm_id,
4202                                     IW_CM_EVENT_CONNECT_REPLY,
4203                                     -ECONNREFUSED);
4204                 break;
4205         case I40IW_CM_EVENT_ABORTED:
4206                 if (!event->cm_node->cm_id ||
4207                     (event->cm_node->state == I40IW_CM_STATE_OFFLOADED))
4208                         break;
4209                 i40iw_event_connect_error(event);
4210                 break;
4211         default:
4212                 i40iw_pr_err("event type = %d\n", event->type);
4213                 break;
4214         }
4215 
4216         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
4217         i40iw_rem_ref_cm_node(event->cm_node);
4218         kfree(event);
4219 }
4220 
4221 /**
4222  * i40iw_cm_post_event - queue event request for worker thread
4223  * @event: cm node's info for up event call
4224  */
4225 static void i40iw_cm_post_event(struct i40iw_cm_event *event)
4226 {
4227         atomic_inc(&event->cm_node->ref_count);
4228         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
4229         INIT_WORK(&event->event_work, i40iw_cm_event_handler);
4230 
4231         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
4232 }
4233 
4234 /**
4235  * i40iw_qhash_ctrl - enable/disable qhash for list
4236  * @iwdev: device pointer
4237  * @parent_listen_node: parent listen node
4238  * @nfo: cm info node
4239  * @ipaddr: Pointer to IPv4 or IPv6 address
4240  * @ipv4: flag indicating IPv4 when true
4241  * @ifup: flag indicating interface up when true
4242  *
4243  * Enables or disables the qhash for the node in the child
4244  * listen list that matches ipaddr. If no matching IP was found
4245  * it will allocate and add a new child listen node to the
4246  * parent listen node. The listen_list_lock is assumed to be
4247  * held when called.
4248  */
4249 static void i40iw_qhash_ctrl(struct i40iw_device *iwdev,
4250                              struct i40iw_cm_listener *parent_listen_node,
4251                              struct i40iw_cm_info *nfo,
4252                              u32 *ipaddr, bool ipv4, bool ifup)
4253 {
4254         struct list_head *child_listen_list = &parent_listen_node->child_listen_list;
4255         struct i40iw_cm_listener *child_listen_node;
4256         struct list_head *pos, *tpos;
4257         enum i40iw_status_code ret;
4258         bool node_allocated = false;
4259         enum i40iw_quad_hash_manage_type op =
4260                 ifup ? I40IW_QHASH_MANAGE_TYPE_ADD : I40IW_QHASH_MANAGE_TYPE_DELETE;
4261 
4262         list_for_each_safe(pos, tpos, child_listen_list) {
4263                 child_listen_node =
4264                         list_entry(pos,
4265                                    struct i40iw_cm_listener,
4266                                    child_listen_list);
4267                 if (!memcmp(child_listen_node->loc_addr, ipaddr, ipv4 ? 4 : 16))
4268                         goto set_qhash;
4269         }
4270 
4271         /* if not found then add a child listener if interface is going up */
4272         if (!ifup)
4273                 return;
4274         child_listen_node = kmemdup(parent_listen_node,
4275                         sizeof(*child_listen_node), GFP_ATOMIC);
4276         if (!child_listen_node)
4277                 return;
4278         node_allocated = true;
4279 
4280         memcpy(child_listen_node->loc_addr, ipaddr,  ipv4 ? 4 : 16);
4281 
4282 set_qhash:
4283         memcpy(nfo->loc_addr,
4284                child_listen_node->loc_addr,
4285                sizeof(nfo->loc_addr));
4286         nfo->vlan_id = child_listen_node->vlan_id;
4287         ret = i40iw_manage_qhash(iwdev, nfo,
4288                                  I40IW_QHASH_TYPE_TCP_SYN,
4289                                  op,
4290                                  NULL, false);
4291         if (!ret) {
4292                 child_listen_node->qhash_set = ifup;
4293                 if (node_allocated)
4294                         list_add(&child_listen_node->child_listen_list,
4295                                  &parent_listen_node->child_listen_list);
4296         } else if (node_allocated) {
4297                 kfree(child_listen_node);
4298         }
4299 }
4300 
4301 /**
4302  * i40iw_cm_teardown_connections - teardown QPs
4303  * @iwdev: device pointer
4304  * @ipaddr: Pointer to IPv4 or IPv6 address
4305  * @ipv4: flag indicating IPv4 when true
4306  * @disconnect_all: flag indicating disconnect all QPs
4307  * teardown QPs where source or destination addr matches ip addr
4308  */
4309 void i40iw_cm_teardown_connections(struct i40iw_device *iwdev, u32 *ipaddr,
4310                                    struct i40iw_cm_info *nfo,
4311                                    bool disconnect_all)
4312 {
4313         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
4314         struct list_head *list_core_temp;
4315         struct list_head *list_node;
4316         struct i40iw_cm_node *cm_node;
4317         unsigned long flags;
4318         struct list_head teardown_list;
4319         struct ib_qp_attr attr;
4320 
4321         INIT_LIST_HEAD(&teardown_list);
4322         spin_lock_irqsave(&cm_core->ht_lock, flags);
4323         list_for_each_safe(list_node, list_core_temp,
4324                            &cm_core->accelerated_list) {
4325                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
4326                 if (disconnect_all ||
4327                     (nfo->vlan_id == cm_node->vlan_id &&
4328                     (!memcmp(cm_node->loc_addr, ipaddr, nfo->ipv4 ? 4 : 16) ||
4329                      !memcmp(cm_node->rem_addr, ipaddr, nfo->ipv4 ? 4 : 16)))) {
4330                         atomic_inc(&cm_node->ref_count);
4331                         list_add(&cm_node->teardown_entry, &teardown_list);
4332                 }
4333         }
4334         list_for_each_safe(list_node, list_core_temp,
4335                            &cm_core->non_accelerated_list) {
4336                 cm_node = container_of(list_node, struct i40iw_cm_node, list);
4337                 if (disconnect_all ||
4338                     (nfo->vlan_id == cm_node->vlan_id &&
4339                     (!memcmp(cm_node->loc_addr, ipaddr, nfo->ipv4 ? 4 : 16) ||
4340                      !memcmp(cm_node->rem_addr, ipaddr, nfo->ipv4 ? 4 : 16)))) {
4341                         atomic_inc(&cm_node->ref_count);
4342                         list_add(&cm_node->teardown_entry, &teardown_list);
4343                 }
4344         }
4345         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
4346 
4347         list_for_each_safe(list_node, list_core_temp, &teardown_list) {
4348                 cm_node = container_of(list_node, struct i40iw_cm_node,
4349                                        teardown_entry);
4350                 attr.qp_state = IB_QPS_ERR;
4351                 i40iw_modify_qp(&cm_node->iwqp->ibqp, &attr, IB_QP_STATE, NULL);
4352                 if (iwdev->reset)
4353                         i40iw_cm_disconn(cm_node->iwqp);
4354                 i40iw_rem_ref_cm_node(cm_node);
4355         }
4356 }
4357 
4358 /**
4359  * i40iw_ifdown_notify - process an ifdown on an interface
4360  * @iwdev: device pointer
4361  * @ipaddr: Pointer to IPv4 or IPv6 address
4362  * @ipv4: flag indicating IPv4 when true
4363  * @ifup: flag indicating interface up when true
4364  */
4365 void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
4366                      u32 *ipaddr, bool ipv4, bool ifup)
4367 {
4368         struct i40iw_cm_core *cm_core = &iwdev->cm_core;
4369         unsigned long flags;
4370         struct i40iw_cm_listener *listen_node;
4371         static const u32 ip_zero[4] = { 0, 0, 0, 0 };
4372         struct i40iw_cm_info nfo;
4373         u16 vlan_id = rdma_vlan_dev_vlan_id(netdev);
4374         enum i40iw_status_code ret;
4375         enum i40iw_quad_hash_manage_type op =
4376                 ifup ? I40IW_QHASH_MANAGE_TYPE_ADD : I40IW_QHASH_MANAGE_TYPE_DELETE;
4377 
4378         nfo.vlan_id = vlan_id;
4379         nfo.ipv4 = ipv4;
4380 
4381         /* Disable or enable qhash for listeners */
4382         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
4383         list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
4384                 if (vlan_id == listen_node->vlan_id &&
4385                     (!memcmp(listen_node->loc_addr, ipaddr, ipv4 ? 4 : 16) ||
4386                     !memcmp(listen_node->loc_addr, ip_zero, ipv4 ? 4 : 16))) {
4387                         memcpy(nfo.loc_addr, listen_node->loc_addr,
4388                                sizeof(nfo.loc_addr));
4389                         nfo.loc_port = listen_node->loc_port;
4390                         nfo.user_pri = listen_node->user_pri;
4391                         if (!list_empty(&listen_node->child_listen_list)) {
4392                                 i40iw_qhash_ctrl(iwdev,
4393                                                  listen_node,
4394                                                  &nfo,
4395                                                  ipaddr, ipv4, ifup);
4396                         } else if (memcmp(listen_node->loc_addr, ip_zero,
4397                                           ipv4 ? 4 : 16)) {
4398                                 ret = i40iw_manage_qhash(iwdev,
4399                                                          &nfo,
4400                                                          I40IW_QHASH_TYPE_TCP_SYN,
4401                                                          op,
4402                                                          NULL,
4403                                                          false);
4404                                 if (!ret)
4405                                         listen_node->qhash_set = ifup;
4406                         }
4407                 }
4408         }
4409         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
4410 
4411         /* teardown connected qp's on ifdown */
4412         if (!ifup)
4413                 i40iw_cm_teardown_connections(iwdev, ipaddr, &nfo, false);
4414 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/hw/i40iw/i40iw_cm.c

DEFINITIONS
