drivers/infiniband/sw/siw/siw

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This source file includes following definitions.
siw_sk_assign_cm_upcalls
siw_sk_save_upcalls
siw_sk_restore_upcalls
siw_qp_socket_assoc
siw_socket_disassoc
siw_rtr_data_ready
siw_sk_assign_rtr_upcalls
siw_cep_socket_assoc
siw_cep_alloc
siw_cm_free_work
siw_cancel_mpatimer
siw_put_work
siw_cep_set_inuse
siw_cep_set_free
__siw_cep_dealloc
siw_get_work
siw_cm_alloc_work
siw_cm_upcall
siw_qp_cm_drop
siw_cep_put
siw_cep_get
siw_send_mpareqrep
siw_recv_mpa_rr
siw_proc_mpareq
siw_proc_mpareply
siw_accept_newconn
siw_cm_work_handler
siw_cm_queue_work
siw_cm_llp_data_ready
siw_cm_llp_write_space
siw_cm_llp_error_report
siw_cm_llp_state_change
kernel_bindconnect
siw_connect
siw_accept
siw_reject
siw_create_listen
siw_drop_listeners
siw_destroy_listen
siw_cm_init
siw_cm_exit
   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2 
   3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4 /*          Fredy Neeser */
   5 /*          Greg Joyce <greg@opengridcomputing.com> */
   6 /* Copyright (c) 2008-2019, IBM Corporation */
   7 /* Copyright (c) 2017, Open Grid Computing, Inc. */
   8 
   9 #include <linux/errno.h>
  10 #include <linux/types.h>
  11 #include <linux/net.h>
  12 #include <linux/inetdevice.h>
  13 #include <net/addrconf.h>
  14 #include <linux/workqueue.h>
  15 #include <net/sock.h>
  16 #include <net/tcp.h>
  17 #include <linux/inet.h>
  18 #include <linux/tcp.h>
  19 
  20 #include <rdma/iw_cm.h>
  21 #include <rdma/ib_verbs.h>
  22 #include <rdma/ib_user_verbs.h>
  23 
  24 #include "siw.h"
  25 #include "siw_cm.h"
  26 
  27 /*
  28  * Set to any combination of
  29  * MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
  30  */
  31 static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
  32 static const bool relaxed_ird_negotiation = 1;
  33 
  34 static void siw_cm_llp_state_change(struct sock *s);
  35 static void siw_cm_llp_data_ready(struct sock *s);
  36 static void siw_cm_llp_write_space(struct sock *s);
  37 static void siw_cm_llp_error_report(struct sock *s);
  38 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
  39                          int status);
  40 
  41 static void siw_sk_assign_cm_upcalls(struct sock *sk)
  42 {
  43         write_lock_bh(&sk->sk_callback_lock);
  44         sk->sk_state_change = siw_cm_llp_state_change;
  45         sk->sk_data_ready = siw_cm_llp_data_ready;
  46         sk->sk_write_space = siw_cm_llp_write_space;
  47         sk->sk_error_report = siw_cm_llp_error_report;
  48         write_unlock_bh(&sk->sk_callback_lock);
  49 }
  50 
  51 static void siw_sk_save_upcalls(struct sock *sk)
  52 {
  53         struct siw_cep *cep = sk_to_cep(sk);
  54 
  55         write_lock_bh(&sk->sk_callback_lock);
  56         cep->sk_state_change = sk->sk_state_change;
  57         cep->sk_data_ready = sk->sk_data_ready;
  58         cep->sk_write_space = sk->sk_write_space;
  59         cep->sk_error_report = sk->sk_error_report;
  60         write_unlock_bh(&sk->sk_callback_lock);
  61 }
  62 
  63 static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
  64 {
  65         sk->sk_state_change = cep->sk_state_change;
  66         sk->sk_data_ready = cep->sk_data_ready;
  67         sk->sk_write_space = cep->sk_write_space;
  68         sk->sk_error_report = cep->sk_error_report;
  69         sk->sk_user_data = NULL;
  70 }
  71 
  72 static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
  73 {
  74         struct socket *s = cep->sock;
  75         struct sock *sk = s->sk;
  76 
  77         write_lock_bh(&sk->sk_callback_lock);
  78 
  79         qp->attrs.sk = s;
  80         sk->sk_data_ready = siw_qp_llp_data_ready;
  81         sk->sk_write_space = siw_qp_llp_write_space;
  82 
  83         write_unlock_bh(&sk->sk_callback_lock);
  84 }
  85 
  86 static void siw_socket_disassoc(struct socket *s)
  87 {
  88         struct sock *sk = s->sk;
  89         struct siw_cep *cep;
  90 
  91         if (sk) {
  92                 write_lock_bh(&sk->sk_callback_lock);
  93                 cep = sk_to_cep(sk);
  94                 if (cep) {
  95                         siw_sk_restore_upcalls(sk, cep);
  96                         siw_cep_put(cep);
  97                 } else {
  98                         pr_warn("siw: cannot restore sk callbacks: no ep\n");
  99                 }
 100                 write_unlock_bh(&sk->sk_callback_lock);
 101         } else {
 102                 pr_warn("siw: cannot restore sk callbacks: no sk\n");
 103         }
 104 }
 105 
 106 static void siw_rtr_data_ready(struct sock *sk)
 107 {
 108         struct siw_cep *cep;
 109         struct siw_qp *qp = NULL;
 110         read_descriptor_t rd_desc;
 111 
 112         read_lock(&sk->sk_callback_lock);
 113 
 114         cep = sk_to_cep(sk);
 115         if (!cep) {
 116                 WARN(1, "No connection endpoint\n");
 117                 goto out;
 118         }
 119         qp = sk_to_qp(sk);
 120 
 121         memset(&rd_desc, 0, sizeof(rd_desc));
 122         rd_desc.arg.data = qp;
 123         rd_desc.count = 1;
 124 
 125         tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
 126         /*
 127          * Check if first frame was successfully processed.
 128          * Signal connection full establishment if yes.
 129          * Failed data processing would have already scheduled
 130          * connection drop.
 131          */
 132         if (!qp->rx_stream.rx_suspend)
 133                 siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
 134 out:
 135         read_unlock(&sk->sk_callback_lock);
 136         if (qp)
 137                 siw_qp_socket_assoc(cep, qp);
 138 }
 139 
 140 static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
 141 {
 142         struct sock *sk = cep->sock->sk;
 143 
 144         write_lock_bh(&sk->sk_callback_lock);
 145         sk->sk_data_ready = siw_rtr_data_ready;
 146         sk->sk_write_space = siw_qp_llp_write_space;
 147         write_unlock_bh(&sk->sk_callback_lock);
 148 }
 149 
 150 static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
 151 {
 152         cep->sock = s;
 153         siw_cep_get(cep);
 154         s->sk->sk_user_data = cep;
 155 
 156         siw_sk_save_upcalls(s->sk);
 157         siw_sk_assign_cm_upcalls(s->sk);
 158 }
 159 
 160 static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
 161 {
 162         struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
 163         unsigned long flags;
 164 
 165         if (!cep)
 166                 return NULL;
 167 
 168         INIT_LIST_HEAD(&cep->listenq);
 169         INIT_LIST_HEAD(&cep->devq);
 170         INIT_LIST_HEAD(&cep->work_freelist);
 171 
 172         kref_init(&cep->ref);
 173         cep->state = SIW_EPSTATE_IDLE;
 174         init_waitqueue_head(&cep->waitq);
 175         spin_lock_init(&cep->lock);
 176         cep->sdev = sdev;
 177         cep->enhanced_rdma_conn_est = false;
 178 
 179         spin_lock_irqsave(&sdev->lock, flags);
 180         list_add_tail(&cep->devq, &sdev->cep_list);
 181         spin_unlock_irqrestore(&sdev->lock, flags);
 182 
 183         siw_dbg_cep(cep, "new endpoint\n");
 184         return cep;
 185 }
 186 
 187 static void siw_cm_free_work(struct siw_cep *cep)
 188 {
 189         struct list_head *w, *tmp;
 190         struct siw_cm_work *work;
 191 
 192         list_for_each_safe(w, tmp, &cep->work_freelist) {
 193                 work = list_entry(w, struct siw_cm_work, list);
 194                 list_del(&work->list);
 195                 kfree(work);
 196         }
 197 }
 198 
 199 static void siw_cancel_mpatimer(struct siw_cep *cep)
 200 {
 201         spin_lock_bh(&cep->lock);
 202         if (cep->mpa_timer) {
 203                 if (cancel_delayed_work(&cep->mpa_timer->work)) {
 204                         siw_cep_put(cep);
 205                         kfree(cep->mpa_timer); /* not needed again */
 206                 }
 207                 cep->mpa_timer = NULL;
 208         }
 209         spin_unlock_bh(&cep->lock);
 210 }
 211 
 212 static void siw_put_work(struct siw_cm_work *work)
 213 {
 214         INIT_LIST_HEAD(&work->list);
 215         spin_lock_bh(&work->cep->lock);
 216         list_add(&work->list, &work->cep->work_freelist);
 217         spin_unlock_bh(&work->cep->lock);
 218 }
 219 
 220 static void siw_cep_set_inuse(struct siw_cep *cep)
 221 {
 222         unsigned long flags;
 223 retry:
 224         spin_lock_irqsave(&cep->lock, flags);
 225 
 226         if (cep->in_use) {
 227                 spin_unlock_irqrestore(&cep->lock, flags);
 228                 wait_event_interruptible(cep->waitq, !cep->in_use);
 229                 if (signal_pending(current))
 230                         flush_signals(current);
 231                 goto retry;
 232         } else {
 233                 cep->in_use = 1;
 234                 spin_unlock_irqrestore(&cep->lock, flags);
 235         }
 236 }
 237 
 238 static void siw_cep_set_free(struct siw_cep *cep)
 239 {
 240         unsigned long flags;
 241 
 242         spin_lock_irqsave(&cep->lock, flags);
 243         cep->in_use = 0;
 244         spin_unlock_irqrestore(&cep->lock, flags);
 245 
 246         wake_up(&cep->waitq);
 247 }
 248 
 249 static void __siw_cep_dealloc(struct kref *ref)
 250 {
 251         struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
 252         struct siw_device *sdev = cep->sdev;
 253         unsigned long flags;
 254 
 255         WARN_ON(cep->listen_cep);
 256 
 257         /* kfree(NULL) is safe */
 258         kfree(cep->mpa.pdata);
 259         spin_lock_bh(&cep->lock);
 260         if (!list_empty(&cep->work_freelist))
 261                 siw_cm_free_work(cep);
 262         spin_unlock_bh(&cep->lock);
 263 
 264         spin_lock_irqsave(&sdev->lock, flags);
 265         list_del(&cep->devq);
 266         spin_unlock_irqrestore(&sdev->lock, flags);
 267 
 268         siw_dbg_cep(cep, "free endpoint\n");
 269         kfree(cep);
 270 }
 271 
 272 static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
 273 {
 274         struct siw_cm_work *work = NULL;
 275 
 276         spin_lock_bh(&cep->lock);
 277         if (!list_empty(&cep->work_freelist)) {
 278                 work = list_entry(cep->work_freelist.next, struct siw_cm_work,
 279                                   list);
 280                 list_del_init(&work->list);
 281         }
 282         spin_unlock_bh(&cep->lock);
 283         return work;
 284 }
 285 
 286 static int siw_cm_alloc_work(struct siw_cep *cep, int num)
 287 {
 288         struct siw_cm_work *work;
 289 
 290         while (num--) {
 291                 work = kmalloc(sizeof(*work), GFP_KERNEL);
 292                 if (!work) {
 293                         if (!(list_empty(&cep->work_freelist)))
 294                                 siw_cm_free_work(cep);
 295                         return -ENOMEM;
 296                 }
 297                 work->cep = cep;
 298                 INIT_LIST_HEAD(&work->list);
 299                 list_add(&work->list, &cep->work_freelist);
 300         }
 301         return 0;
 302 }
 303 
 304 /*
 305  * siw_cm_upcall()
 306  *
 307  * Upcall to IWCM to inform about async connection events
 308  */
 309 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
 310                          int status)
 311 {
 312         struct iw_cm_event event;
 313         struct iw_cm_id *id;
 314 
 315         memset(&event, 0, sizeof(event));
 316         event.status = status;
 317         event.event = reason;
 318 
 319         if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
 320                 event.provider_data = cep;
 321                 id = cep->listen_cep->cm_id;
 322         } else {
 323                 id = cep->cm_id;
 324         }
 325         /* Signal IRD and ORD */
 326         if (reason == IW_CM_EVENT_ESTABLISHED ||
 327             reason == IW_CM_EVENT_CONNECT_REPLY) {
 328                 /* Signal negotiated IRD/ORD values we will use */
 329                 event.ird = cep->ird;
 330                 event.ord = cep->ord;
 331         } else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
 332                 event.ird = cep->ord;
 333                 event.ord = cep->ird;
 334         }
 335         /* Signal private data and address information */
 336         if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
 337             reason == IW_CM_EVENT_CONNECT_REPLY) {
 338                 u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
 339 
 340                 if (pd_len) {
 341                         /*
 342                          * hand over MPA private data
 343                          */
 344                         event.private_data_len = pd_len;
 345                         event.private_data = cep->mpa.pdata;
 346 
 347                         /* Hide MPA V2 IRD/ORD control */
 348                         if (cep->enhanced_rdma_conn_est) {
 349                                 event.private_data_len -=
 350                                         sizeof(struct mpa_v2_data);
 351                                 event.private_data +=
 352                                         sizeof(struct mpa_v2_data);
 353                         }
 354                 }
 355                 getname_local(cep->sock, &event.local_addr);
 356                 getname_peer(cep->sock, &event.remote_addr);
 357         }
 358         siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
 359                     cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
 360 
 361         return id->event_handler(id, &event);
 362 }
 363 
 364 /*
 365  * siw_qp_cm_drop()
 366  *
 367  * Drops established LLP connection if present and not already
 368  * scheduled for dropping. Called from user context, SQ workqueue
 369  * or receive IRQ. Caller signals if socket can be immediately
 370  * closed (basically, if not in IRQ).
 371  */
 372 void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
 373 {
 374         struct siw_cep *cep = qp->cep;
 375 
 376         qp->rx_stream.rx_suspend = 1;
 377         qp->tx_ctx.tx_suspend = 1;
 378 
 379         if (!qp->cep)
 380                 return;
 381 
 382         if (schedule) {
 383                 siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
 384         } else {
 385                 siw_cep_set_inuse(cep);
 386 
 387                 if (cep->state == SIW_EPSTATE_CLOSED) {
 388                         siw_dbg_cep(cep, "already closed\n");
 389                         goto out;
 390                 }
 391                 siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
 392 
 393                 if (qp->term_info.valid)
 394                         siw_send_terminate(qp);
 395 
 396                 if (cep->cm_id) {
 397                         switch (cep->state) {
 398                         case SIW_EPSTATE_AWAIT_MPAREP:
 399                                 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
 400                                               -EINVAL);
 401                                 break;
 402 
 403                         case SIW_EPSTATE_RDMA_MODE:
 404                                 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
 405                                 break;
 406 
 407                         case SIW_EPSTATE_IDLE:
 408                         case SIW_EPSTATE_LISTENING:
 409                         case SIW_EPSTATE_CONNECTING:
 410                         case SIW_EPSTATE_AWAIT_MPAREQ:
 411                         case SIW_EPSTATE_RECVD_MPAREQ:
 412                         case SIW_EPSTATE_CLOSED:
 413                         default:
 414                                 break;
 415                         }
 416                         cep->cm_id->rem_ref(cep->cm_id);
 417                         cep->cm_id = NULL;
 418                         siw_cep_put(cep);
 419                 }
 420                 cep->state = SIW_EPSTATE_CLOSED;
 421 
 422                 if (cep->sock) {
 423                         siw_socket_disassoc(cep->sock);
 424                         /*
 425                          * Immediately close socket
 426                          */
 427                         sock_release(cep->sock);
 428                         cep->sock = NULL;
 429                 }
 430                 if (cep->qp) {
 431                         cep->qp = NULL;
 432                         siw_qp_put(qp);
 433                 }
 434 out:
 435                 siw_cep_set_free(cep);
 436         }
 437 }
 438 
 439 void siw_cep_put(struct siw_cep *cep)
 440 {
 441         WARN_ON(kref_read(&cep->ref) < 1);
 442         kref_put(&cep->ref, __siw_cep_dealloc);
 443 }
 444 
 445 void siw_cep_get(struct siw_cep *cep)
 446 {
 447         kref_get(&cep->ref);
 448 }
 449 
 450 /*
 451  * Expects params->pd_len in host byte order
 452  */
 453 static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
 454 {
 455         struct socket *s = cep->sock;
 456         struct mpa_rr *rr = &cep->mpa.hdr;
 457         struct kvec iov[3];
 458         struct msghdr msg;
 459         int rv;
 460         int iovec_num = 0;
 461         int mpa_len;
 462 
 463         memset(&msg, 0, sizeof(msg));
 464 
 465         iov[iovec_num].iov_base = rr;
 466         iov[iovec_num].iov_len = sizeof(*rr);
 467         mpa_len = sizeof(*rr);
 468 
 469         if (cep->enhanced_rdma_conn_est) {
 470                 iovec_num++;
 471                 iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
 472                 iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
 473                 mpa_len += sizeof(cep->mpa.v2_ctrl);
 474         }
 475         if (pd_len) {
 476                 iovec_num++;
 477                 iov[iovec_num].iov_base = (char *)pdata;
 478                 iov[iovec_num].iov_len = pd_len;
 479                 mpa_len += pd_len;
 480         }
 481         if (cep->enhanced_rdma_conn_est)
 482                 pd_len += sizeof(cep->mpa.v2_ctrl);
 483 
 484         rr->params.pd_len = cpu_to_be16(pd_len);
 485 
 486         rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
 487 
 488         return rv < 0 ? rv : 0;
 489 }
 490 
 491 /*
 492  * Receive MPA Request/Reply header.
 493  *
 494  * Returns 0 if complete MPA Request/Reply header including
 495  * eventual private data was received. Returns -EAGAIN if
 496  * header was partially received or negative error code otherwise.
 497  *
 498  * Context: May be called in process context only
 499  */
 500 static int siw_recv_mpa_rr(struct siw_cep *cep)
 501 {
 502         struct mpa_rr *hdr = &cep->mpa.hdr;
 503         struct socket *s = cep->sock;
 504         u16 pd_len;
 505         int rcvd, to_rcv;
 506 
 507         if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) {
 508                 rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd,
 509                                   sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd,
 510                                   0);
 511                 if (rcvd <= 0)
 512                         return -ECONNABORTED;
 513 
 514                 cep->mpa.bytes_rcvd += rcvd;
 515 
 516                 if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr))
 517                         return -EAGAIN;
 518 
 519                 if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA)
 520                         return -EPROTO;
 521         }
 522         pd_len = be16_to_cpu(hdr->params.pd_len);
 523 
 524         /*
 525          * At least the MPA Request/Reply header (frame not including
 526          * private data) has been received.
 527          * Receive (or continue receiving) any private data.
 528          */
 529         to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr));
 530 
 531         if (!to_rcv) {
 532                 /*
 533                  * We must have hdr->params.pd_len == 0 and thus received a
 534                  * complete MPA Request/Reply frame.
 535                  * Check against peer protocol violation.
 536                  */
 537                 u32 word;
 538 
 539                 rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT);
 540                 if (rcvd == -EAGAIN)
 541                         return 0;
 542 
 543                 if (rcvd == 0) {
 544                         siw_dbg_cep(cep, "peer EOF\n");
 545                         return -EPIPE;
 546                 }
 547                 if (rcvd < 0) {
 548                         siw_dbg_cep(cep, "error: %d\n", rcvd);
 549                         return rcvd;
 550                 }
 551                 siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd);
 552 
 553                 return -EPROTO;
 554         }
 555 
 556         /*
 557          * At this point, we must have hdr->params.pd_len != 0.
 558          * A private data buffer gets allocated if hdr->params.pd_len != 0.
 559          */
 560         if (!cep->mpa.pdata) {
 561                 cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL);
 562                 if (!cep->mpa.pdata)
 563                         return -ENOMEM;
 564         }
 565         rcvd = ksock_recv(
 566                 s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr),
 567                 to_rcv + 4, MSG_DONTWAIT);
 568 
 569         if (rcvd < 0)
 570                 return rcvd;
 571 
 572         if (rcvd > to_rcv)
 573                 return -EPROTO;
 574 
 575         cep->mpa.bytes_rcvd += rcvd;
 576 
 577         if (to_rcv == rcvd) {
 578                 siw_dbg_cep(cep, "%d bytes private data received\n", pd_len);
 579                 return 0;
 580         }
 581         return -EAGAIN;
 582 }
 583 
 584 /*
 585  * siw_proc_mpareq()
 586  *
 587  * Read MPA Request from socket and signal new connection to IWCM
 588  * if success. Caller must hold lock on corresponding listening CEP.
 589  */
 590 static int siw_proc_mpareq(struct siw_cep *cep)
 591 {
 592         struct mpa_rr *req;
 593         int version, rv;
 594         u16 pd_len;
 595 
 596         rv = siw_recv_mpa_rr(cep);
 597         if (rv)
 598                 return rv;
 599 
 600         req = &cep->mpa.hdr;
 601 
 602         version = __mpa_rr_revision(req->params.bits);
 603         pd_len = be16_to_cpu(req->params.pd_len);
 604 
 605         if (version > MPA_REVISION_2)
 606                 /* allow for 0, 1, and 2 only */
 607                 return -EPROTO;
 608 
 609         if (memcmp(req->key, MPA_KEY_REQ, 16))
 610                 return -EPROTO;
 611 
 612         /* Prepare for sending MPA reply */
 613         memcpy(req->key, MPA_KEY_REP, 16);
 614 
 615         if (version == MPA_REVISION_2 &&
 616             (req->params.bits & MPA_RR_FLAG_ENHANCED)) {
 617                 /*
 618                  * MPA version 2 must signal IRD/ORD values and P2P mode
 619                  * in private data if header flag MPA_RR_FLAG_ENHANCED
 620                  * is set.
 621                  */
 622                 if (pd_len < sizeof(struct mpa_v2_data))
 623                         goto reject_conn;
 624 
 625                 cep->enhanced_rdma_conn_est = true;
 626         }
 627 
 628         /* MPA Markers: currently not supported. Marker TX to be added. */
 629         if (req->params.bits & MPA_RR_FLAG_MARKERS)
 630                 goto reject_conn;
 631 
 632         if (req->params.bits & MPA_RR_FLAG_CRC) {
 633                 /*
 634                  * RFC 5044, page 27: CRC MUST be used if peer requests it.
 635                  * siw specific: 'mpa_crc_strict' parameter to reject
 636                  * connection with CRC if local CRC off enforced by
 637                  * 'mpa_crc_strict' module parameter.
 638                  */
 639                 if (!mpa_crc_required && mpa_crc_strict)
 640                         goto reject_conn;
 641 
 642                 /* Enable CRC if requested by module parameter */
 643                 if (mpa_crc_required)
 644                         req->params.bits |= MPA_RR_FLAG_CRC;
 645         }
 646         if (cep->enhanced_rdma_conn_est) {
 647                 struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata;
 648 
 649                 /*
 650                  * Peer requested ORD becomes requested local IRD,
 651                  * peer requested IRD becomes requested local ORD.
 652                  * IRD and ORD get limited by global maximum values.
 653                  */
 654                 cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
 655                 cep->ord = min(cep->ord, SIW_MAX_ORD_QP);
 656                 cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
 657                 cep->ird = min(cep->ird, SIW_MAX_IRD_QP);
 658 
 659                 /* May get overwritten by locally negotiated values */
 660                 cep->mpa.v2_ctrl.ird = htons(cep->ird);
 661                 cep->mpa.v2_ctrl.ord = htons(cep->ord);
 662 
 663                 /*
 664                  * Support for peer sent zero length Write or Read to
 665                  * let local side enter RTS. Writes are preferred.
 666                  * Sends would require pre-posting a Receive and are
 667                  * not supported.
 668                  * Propose zero length Write if none of Read and Write
 669                  * is indicated.
 670                  */
 671                 if (v2->ird & MPA_V2_PEER_TO_PEER) {
 672                         cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
 673 
 674                         if (v2->ord & MPA_V2_RDMA_WRITE_RTR)
 675                                 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
 676                         else if (v2->ord & MPA_V2_RDMA_READ_RTR)
 677                                 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR;
 678                         else
 679                                 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
 680                 }
 681         }
 682 
 683         cep->state = SIW_EPSTATE_RECVD_MPAREQ;
 684 
 685         /* Keep reference until IWCM accepts/rejects */
 686         siw_cep_get(cep);
 687         rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0);
 688         if (rv)
 689                 siw_cep_put(cep);
 690 
 691         return rv;
 692 
 693 reject_conn:
 694         siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n",
 695                     req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
 696                     mpa_crc_required, mpa_crc_strict,
 697                     req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
 698 
 699         req->params.bits &= ~MPA_RR_FLAG_MARKERS;
 700         req->params.bits |= MPA_RR_FLAG_REJECT;
 701 
 702         if (!mpa_crc_required && mpa_crc_strict)
 703                 req->params.bits &= ~MPA_RR_FLAG_CRC;
 704 
 705         if (pd_len)
 706                 kfree(cep->mpa.pdata);
 707 
 708         cep->mpa.pdata = NULL;
 709 
 710         siw_send_mpareqrep(cep, NULL, 0);
 711 
 712         return -EOPNOTSUPP;
 713 }
 714 
 715 static int siw_proc_mpareply(struct siw_cep *cep)
 716 {
 717         struct siw_qp_attrs qp_attrs;
 718         enum siw_qp_attr_mask qp_attr_mask;
 719         struct siw_qp *qp = cep->qp;
 720         struct mpa_rr *rep;
 721         int rv;
 722         u16 rep_ord;
 723         u16 rep_ird;
 724         bool ird_insufficient = false;
 725         enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR;
 726 
 727         rv = siw_recv_mpa_rr(cep);
 728         if (rv != -EAGAIN)
 729                 siw_cancel_mpatimer(cep);
 730         if (rv)
 731                 goto out_err;
 732 
 733         rep = &cep->mpa.hdr;
 734 
 735         if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) {
 736                 /* allow for 0, 1,  and 2 only */
 737                 rv = -EPROTO;
 738                 goto out_err;
 739         }
 740         if (memcmp(rep->key, MPA_KEY_REP, 16)) {
 741                 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA,
 742                                    LLP_ECODE_INVALID_REQ_RESP, 0);
 743                 siw_send_terminate(qp);
 744                 rv = -EPROTO;
 745                 goto out_err;
 746         }
 747         if (rep->params.bits & MPA_RR_FLAG_REJECT) {
 748                 siw_dbg_cep(cep, "got mpa reject\n");
 749                 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET);
 750 
 751                 return -ECONNRESET;
 752         }
 753         if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) {
 754                 siw_dbg_cep(cep, "peer allows GSO on TX\n");
 755                 qp->tx_ctx.gso_seg_limit = 0;
 756         }
 757         if ((rep->params.bits & MPA_RR_FLAG_MARKERS) ||
 758             (mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) ||
 759             (mpa_crc_strict && !mpa_crc_required &&
 760              (rep->params.bits & MPA_RR_FLAG_CRC))) {
 761                 siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n",
 762                             rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
 763                             mpa_crc_required, mpa_crc_strict,
 764                             rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
 765 
 766                 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED);
 767 
 768                 return -EINVAL;
 769         }
 770         if (cep->enhanced_rdma_conn_est) {
 771                 struct mpa_v2_data *v2;
 772 
 773                 if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 ||
 774                     !(rep->params.bits & MPA_RR_FLAG_ENHANCED)) {
 775                         /*
 776                          * Protocol failure: The responder MUST reply with
 777                          * MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED.
 778                          */
 779                         siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n",
 780                                     __mpa_rr_revision(rep->params.bits),
 781                                     rep->params.bits & MPA_RR_FLAG_ENHANCED ?
 782                                             1 :
 783                                             0);
 784 
 785                         siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
 786                                       -ECONNRESET);
 787                         return -EINVAL;
 788                 }
 789                 v2 = (struct mpa_v2_data *)cep->mpa.pdata;
 790                 rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
 791                 rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
 792 
 793                 if (cep->ird < rep_ord &&
 794                     (relaxed_ird_negotiation == false ||
 795                      rep_ord > cep->sdev->attrs.max_ird)) {
 796                         siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n",
 797                                     cep->ird, rep_ord,
 798                                     cep->sdev->attrs.max_ord);
 799                         ird_insufficient = true;
 800                 }
 801                 if (cep->ord > rep_ird && relaxed_ird_negotiation == false) {
 802                         siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord,
 803                                     rep_ird);
 804                         ird_insufficient = true;
 805                 }
 806                 /*
 807                  * Always report negotiated peer values to user,
 808                  * even if IRD/ORD negotiation failed
 809                  */
 810                 cep->ird = rep_ord;
 811                 cep->ord = rep_ird;
 812 
 813                 if (ird_insufficient) {
 814                         /*
 815                          * If the initiator IRD is insuffient for the
 816                          * responder ORD, send a TERM.
 817                          */
 818                         siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
 819                                            LLP_ETYPE_MPA,
 820                                            LLP_ECODE_INSUFFICIENT_IRD, 0);
 821                         siw_send_terminate(qp);
 822                         rv = -ENOMEM;
 823                         goto out_err;
 824                 }
 825                 if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER)
 826                         mpa_p2p_mode =
 827                                 cep->mpa.v2_ctrl_req.ord &
 828                                 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR);
 829 
 830                 /*
 831                  * Check if we requested P2P mode, and if peer agrees
 832                  */
 833                 if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
 834                         if ((mpa_p2p_mode & v2->ord) == 0) {
 835                                 /*
 836                                  * We requested RTR mode(s), but the peer
 837                                  * did not pick any mode we support.
 838                                  */
 839                                 siw_dbg_cep(cep,
 840                                             "rtr mode:  req %2x, got %2x\n",
 841                                             mpa_p2p_mode,
 842                                             v2->ord & (MPA_V2_RDMA_WRITE_RTR |
 843                                                        MPA_V2_RDMA_READ_RTR));
 844 
 845                                 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
 846                                                    LLP_ETYPE_MPA,
 847                                                    LLP_ECODE_NO_MATCHING_RTR,
 848                                                    0);
 849                                 siw_send_terminate(qp);
 850                                 rv = -EPROTO;
 851                                 goto out_err;
 852                         }
 853                         mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR |
 854                                                   MPA_V2_RDMA_READ_RTR);
 855                 }
 856         }
 857         memset(&qp_attrs, 0, sizeof(qp_attrs));
 858 
 859         if (rep->params.bits & MPA_RR_FLAG_CRC)
 860                 qp_attrs.flags = SIW_MPA_CRC;
 861 
 862         qp_attrs.irq_size = cep->ird;
 863         qp_attrs.orq_size = cep->ord;
 864         qp_attrs.sk = cep->sock;
 865         qp_attrs.state = SIW_QP_STATE_RTS;
 866 
 867         qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
 868                        SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA;
 869 
 870         /* Move socket RX/TX under QP control */
 871         down_write(&qp->state_lock);
 872         if (qp->attrs.state > SIW_QP_STATE_RTR) {
 873                 rv = -EINVAL;
 874                 up_write(&qp->state_lock);
 875                 goto out_err;
 876         }
 877         rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask);
 878 
 879         siw_qp_socket_assoc(cep, qp);
 880 
 881         up_write(&qp->state_lock);
 882 
 883         /* Send extra RDMA frame to trigger peer RTS if negotiated */
 884         if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
 885                 rv = siw_qp_mpa_rts(qp, mpa_p2p_mode);
 886                 if (rv)
 887                         goto out_err;
 888         }
 889         if (!rv) {
 890                 rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0);
 891                 if (!rv)
 892                         cep->state = SIW_EPSTATE_RDMA_MODE;
 893 
 894                 return 0;
 895         }
 896 
 897 out_err:
 898         siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL);
 899 
 900         return rv;
 901 }
 902 
 903 /*
 904  * siw_accept_newconn - accept an incoming pending connection
 905  *
 906  */
 907 static void siw_accept_newconn(struct siw_cep *cep)
 908 {
 909         struct socket *s = cep->sock;
 910         struct socket *new_s = NULL;
 911         struct siw_cep *new_cep = NULL;
 912         int rv = 0; /* debug only. should disappear */
 913 
 914         if (cep->state != SIW_EPSTATE_LISTENING)
 915                 goto error;
 916 
 917         new_cep = siw_cep_alloc(cep->sdev);
 918         if (!new_cep)
 919                 goto error;
 920 
 921         /*
 922          * 4: Allocate a sufficient number of work elements
 923          * to allow concurrent handling of local + peer close
 924          * events, MPA header processing + MPA timeout.
 925          */
 926         if (siw_cm_alloc_work(new_cep, 4) != 0)
 927                 goto error;
 928 
 929         /*
 930          * Copy saved socket callbacks from listening CEP
 931          * and assign new socket with new CEP
 932          */
 933         new_cep->sk_state_change = cep->sk_state_change;
 934         new_cep->sk_data_ready = cep->sk_data_ready;
 935         new_cep->sk_write_space = cep->sk_write_space;
 936         new_cep->sk_error_report = cep->sk_error_report;
 937 
 938         rv = kernel_accept(s, &new_s, O_NONBLOCK);
 939         if (rv != 0) {
 940                 /*
 941                  * Connection already aborted by peer..?
 942                  */
 943                 siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv);
 944                 goto error;
 945         }
 946         new_cep->sock = new_s;
 947         siw_cep_get(new_cep);
 948         new_s->sk->sk_user_data = new_cep;
 949 
 950         if (siw_tcp_nagle == false) {
 951                 int val = 1;
 952 
 953                 rv = kernel_setsockopt(new_s, SOL_TCP, TCP_NODELAY,
 954                                        (char *)&val, sizeof(val));
 955                 if (rv) {
 956                         siw_dbg_cep(cep, "setsockopt NODELAY error: %d\n", rv);
 957                         goto error;
 958                 }
 959         }
 960         new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
 961 
 962         rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT);
 963         if (rv)
 964                 goto error;
 965         /*
 966          * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep.
 967          */
 968         new_cep->listen_cep = cep;
 969         siw_cep_get(cep);
 970 
 971         if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
 972                 /*
 973                  * MPA REQ already queued
 974                  */
 975                 siw_dbg_cep(cep, "immediate mpa request\n");
 976 
 977                 siw_cep_set_inuse(new_cep);
 978                 rv = siw_proc_mpareq(new_cep);
 979                 siw_cep_set_free(new_cep);
 980 
 981                 if (rv != -EAGAIN) {
 982                         siw_cep_put(cep);
 983                         new_cep->listen_cep = NULL;
 984                         if (rv)
 985                                 goto error;
 986                 }
 987         }
 988         return;
 989 
 990 error:
 991         if (new_cep)
 992                 siw_cep_put(new_cep);
 993 
 994         if (new_s) {
 995                 siw_socket_disassoc(new_s);
 996                 sock_release(new_s);
 997                 new_cep->sock = NULL;
 998         }
 999         siw_dbg_cep(cep, "error %d\n", rv);
1000 }
1001 
1002 static void siw_cm_work_handler(struct work_struct *w)
1003 {
1004         struct siw_cm_work *work;
1005         struct siw_cep *cep;
1006         int release_cep = 0, rv = 0;
1007 
1008         work = container_of(w, struct siw_cm_work, work.work);
1009         cep = work->cep;
1010 
1011         siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
1012                     cep->qp ? qp_id(cep->qp) : UINT_MAX,
1013                     work->type, cep->state);
1014 
1015         siw_cep_set_inuse(cep);
1016 
1017         switch (work->type) {
1018         case SIW_CM_WORK_ACCEPT:
1019                 siw_accept_newconn(cep);
1020                 break;
1021 
1022         case SIW_CM_WORK_READ_MPAHDR:
1023                 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1024                         if (cep->listen_cep) {
1025                                 siw_cep_set_inuse(cep->listen_cep);
1026 
1027                                 if (cep->listen_cep->state ==
1028                                     SIW_EPSTATE_LISTENING)
1029                                         rv = siw_proc_mpareq(cep);
1030                                 else
1031                                         rv = -EFAULT;
1032 
1033                                 siw_cep_set_free(cep->listen_cep);
1034 
1035                                 if (rv != -EAGAIN) {
1036                                         siw_cep_put(cep->listen_cep);
1037                                         cep->listen_cep = NULL;
1038                                         if (rv)
1039                                                 siw_cep_put(cep);
1040                                 }
1041                         }
1042                 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1043                         rv = siw_proc_mpareply(cep);
1044                 } else {
1045                         /*
1046                          * CEP already moved out of MPA handshake.
1047                          * any connection management already done.
1048                          * silently ignore the mpa packet.
1049                          */
1050                         if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1051                                 cep->sock->sk->sk_data_ready(cep->sock->sk);
1052                                 siw_dbg_cep(cep, "already in RDMA mode");
1053                         } else {
1054                                 siw_dbg_cep(cep, "out of state: %d\n",
1055                                             cep->state);
1056                         }
1057                 }
1058                 if (rv && rv != EAGAIN)
1059                         release_cep = 1;
1060                 break;
1061 
1062         case SIW_CM_WORK_CLOSE_LLP:
1063                 /*
1064                  * QP scheduled LLP close
1065                  */
1066                 if (cep->qp && cep->qp->term_info.valid)
1067                         siw_send_terminate(cep->qp);
1068 
1069                 if (cep->cm_id)
1070                         siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1071 
1072                 release_cep = 1;
1073                 break;
1074 
1075         case SIW_CM_WORK_PEER_CLOSE:
1076                 if (cep->cm_id) {
1077                         if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1078                                 /*
1079                                  * MPA reply not received, but connection drop
1080                                  */
1081                                 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1082                                               -ECONNRESET);
1083                         } else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1084                                 /*
1085                                  * NOTE: IW_CM_EVENT_DISCONNECT is given just
1086                                  *       to transition IWCM into CLOSING.
1087                                  */
1088                                 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
1089                                 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1090                         }
1091                         /*
1092                          * for other states there is no connection
1093                          * known to the IWCM.
1094                          */
1095                 } else {
1096                         if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
1097                                 /*
1098                                  * Wait for the ulp/CM to call accept/reject
1099                                  */
1100                                 siw_dbg_cep(cep,
1101                                             "mpa req recvd, wait for ULP\n");
1102                         } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1103                                 /*
1104                                  * Socket close before MPA request received.
1105                                  */
1106                                 siw_dbg_cep(cep, "no mpareq: drop listener\n");
1107                                 siw_cep_put(cep->listen_cep);
1108                                 cep->listen_cep = NULL;
1109                         }
1110                 }
1111                 release_cep = 1;
1112                 break;
1113 
1114         case SIW_CM_WORK_MPATIMEOUT:
1115                 cep->mpa_timer = NULL;
1116 
1117                 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1118                         /*
1119                          * MPA request timed out:
1120                          * Hide any partially received private data and signal
1121                          * timeout
1122                          */
1123                         cep->mpa.hdr.params.pd_len = 0;
1124 
1125                         if (cep->cm_id)
1126                                 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1127                                               -ETIMEDOUT);
1128                         release_cep = 1;
1129 
1130                 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1131                         /*
1132                          * No MPA request received after peer TCP stream setup.
1133                          */
1134                         if (cep->listen_cep) {
1135                                 siw_cep_put(cep->listen_cep);
1136                                 cep->listen_cep = NULL;
1137                         }
1138                         release_cep = 1;
1139                 }
1140                 break;
1141 
1142         default:
1143                 WARN(1, "Undefined CM work type: %d\n", work->type);
1144         }
1145         if (release_cep) {
1146                 siw_dbg_cep(cep,
1147                             "release: timer=%s, QP[%u]\n",
1148                             cep->mpa_timer ? "y" : "n",
1149                             cep->qp ? qp_id(cep->qp) : UINT_MAX);
1150 
1151                 siw_cancel_mpatimer(cep);
1152 
1153                 cep->state = SIW_EPSTATE_CLOSED;
1154 
1155                 if (cep->qp) {
1156                         struct siw_qp *qp = cep->qp;
1157                         /*
1158                          * Serialize a potential race with application
1159                          * closing the QP and calling siw_qp_cm_drop()
1160                          */
1161                         siw_qp_get(qp);
1162                         siw_cep_set_free(cep);
1163 
1164                         siw_qp_llp_close(qp);
1165                         siw_qp_put(qp);
1166 
1167                         siw_cep_set_inuse(cep);
1168                         cep->qp = NULL;
1169                         siw_qp_put(qp);
1170                 }
1171                 if (cep->sock) {
1172                         siw_socket_disassoc(cep->sock);
1173                         sock_release(cep->sock);
1174                         cep->sock = NULL;
1175                 }
1176                 if (cep->cm_id) {
1177                         cep->cm_id->rem_ref(cep->cm_id);
1178                         cep->cm_id = NULL;
1179                         siw_cep_put(cep);
1180                 }
1181         }
1182         siw_cep_set_free(cep);
1183         siw_put_work(work);
1184         siw_cep_put(cep);
1185 }
1186 
1187 static struct workqueue_struct *siw_cm_wq;
1188 
1189 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
1190 {
1191         struct siw_cm_work *work = siw_get_work(cep);
1192         unsigned long delay = 0;
1193 
1194         if (!work) {
1195                 siw_dbg_cep(cep, "failed with no work available\n");
1196                 return -ENOMEM;
1197         }
1198         work->type = type;
1199         work->cep = cep;
1200 
1201         siw_cep_get(cep);
1202 
1203         INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
1204 
1205         if (type == SIW_CM_WORK_MPATIMEOUT) {
1206                 cep->mpa_timer = work;
1207 
1208                 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
1209                         delay = MPAREQ_TIMEOUT;
1210                 else
1211                         delay = MPAREP_TIMEOUT;
1212         }
1213         siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
1214                     cep->qp ? qp_id(cep->qp) : -1, type, delay);
1215 
1216         queue_delayed_work(siw_cm_wq, &work->work, delay);
1217 
1218         return 0;
1219 }
1220 
1221 static void siw_cm_llp_data_ready(struct sock *sk)
1222 {
1223         struct siw_cep *cep;
1224 
1225         read_lock(&sk->sk_callback_lock);
1226 
1227         cep = sk_to_cep(sk);
1228         if (!cep)
1229                 goto out;
1230 
1231         siw_dbg_cep(cep, "state: %d\n", cep->state);
1232 
1233         switch (cep->state) {
1234         case SIW_EPSTATE_RDMA_MODE:
1235                 /* fall through */
1236         case SIW_EPSTATE_LISTENING:
1237                 break;
1238 
1239         case SIW_EPSTATE_AWAIT_MPAREQ:
1240                 /* fall through */
1241         case SIW_EPSTATE_AWAIT_MPAREP:
1242                 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
1243                 break;
1244 
1245         default:
1246                 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
1247                 break;
1248         }
1249 out:
1250         read_unlock(&sk->sk_callback_lock);
1251 }
1252 
1253 static void siw_cm_llp_write_space(struct sock *sk)
1254 {
1255         struct siw_cep *cep = sk_to_cep(sk);
1256 
1257         if (cep)
1258                 siw_dbg_cep(cep, "state: %d\n", cep->state);
1259 }
1260 
1261 static void siw_cm_llp_error_report(struct sock *sk)
1262 {
1263         struct siw_cep *cep = sk_to_cep(sk);
1264 
1265         if (cep) {
1266                 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
1267                             sk->sk_err, sk->sk_state, cep->state);
1268                 cep->sk_error_report(sk);
1269         }
1270 }
1271 
1272 static void siw_cm_llp_state_change(struct sock *sk)
1273 {
1274         struct siw_cep *cep;
1275         void (*orig_state_change)(struct sock *s);
1276 
1277         read_lock(&sk->sk_callback_lock);
1278 
1279         cep = sk_to_cep(sk);
1280         if (!cep) {
1281                 /* endpoint already disassociated */
1282                 read_unlock(&sk->sk_callback_lock);
1283                 return;
1284         }
1285         orig_state_change = cep->sk_state_change;
1286 
1287         siw_dbg_cep(cep, "state: %d\n", cep->state);
1288 
1289         switch (sk->sk_state) {
1290         case TCP_ESTABLISHED:
1291                 /*
1292                  * handle accepting socket as special case where only
1293                  * new connection is possible
1294                  */
1295                 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
1296                 break;
1297 
1298         case TCP_CLOSE:
1299         case TCP_CLOSE_WAIT:
1300                 if (cep->qp)
1301                         cep->qp->tx_ctx.tx_suspend = 1;
1302                 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
1303                 break;
1304 
1305         default:
1306                 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
1307         }
1308         read_unlock(&sk->sk_callback_lock);
1309         orig_state_change(sk);
1310 }
1311 
1312 static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
1313                               struct sockaddr *raddr)
1314 {
1315         int rv, flags = 0, s_val = 1;
1316         size_t size = laddr->sa_family == AF_INET ?
1317                 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
1318 
1319         /*
1320          * Make address available again asap.
1321          */
1322         rv = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
1323                                sizeof(s_val));
1324         if (rv < 0)
1325                 return rv;
1326 
1327         rv = s->ops->bind(s, laddr, size);
1328         if (rv < 0)
1329                 return rv;
1330 
1331         rv = s->ops->connect(s, raddr, size, flags);
1332 
1333         return rv < 0 ? rv : 0;
1334 }
1335 
1336 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1337 {
1338         struct siw_device *sdev = to_siw_dev(id->device);
1339         struct siw_qp *qp;
1340         struct siw_cep *cep = NULL;
1341         struct socket *s = NULL;
1342         struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
1343                         *raddr = (struct sockaddr *)&id->remote_addr;
1344         bool p2p_mode = peer_to_peer, v4 = true;
1345         u16 pd_len = params->private_data_len;
1346         int version = mpa_version, rv;
1347 
1348         if (pd_len > MPA_MAX_PRIVDATA)
1349                 return -EINVAL;
1350 
1351         if (params->ird > sdev->attrs.max_ird ||
1352             params->ord > sdev->attrs.max_ord)
1353                 return -ENOMEM;
1354 
1355         if (laddr->sa_family == AF_INET6)
1356                 v4 = false;
1357         else if (laddr->sa_family != AF_INET)
1358                 return -EAFNOSUPPORT;
1359 
1360         /*
1361          * Respect any iwarp port mapping: Use mapped remote address
1362          * if valid. Local address must not be mapped, since siw
1363          * uses kernel TCP stack.
1364          */
1365         if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
1366              to_sockaddr_in6(id->remote_addr).sin6_port != 0)
1367                 raddr = (struct sockaddr *)&id->m_remote_addr;
1368 
1369         qp = siw_qp_id2obj(sdev, params->qpn);
1370         if (!qp) {
1371                 WARN(1, "[QP %u] does not exist\n", params->qpn);
1372                 rv = -EINVAL;
1373                 goto error;
1374         }
1375         if (v4)
1376                 siw_dbg_qp(qp,
1377                            "pd_len %d, laddr %pI4 %d, raddr %pI4 %d\n",
1378                            pd_len,
1379                            &((struct sockaddr_in *)(laddr))->sin_addr,
1380                            ntohs(((struct sockaddr_in *)(laddr))->sin_port),
1381                            &((struct sockaddr_in *)(raddr))->sin_addr,
1382                            ntohs(((struct sockaddr_in *)(raddr))->sin_port));
1383         else
1384                 siw_dbg_qp(qp,
1385                            "pd_len %d, laddr %pI6 %d, raddr %pI6 %d\n",
1386                            pd_len,
1387                            &((struct sockaddr_in6 *)(laddr))->sin6_addr,
1388                            ntohs(((struct sockaddr_in6 *)(laddr))->sin6_port),
1389                            &((struct sockaddr_in6 *)(raddr))->sin6_addr,
1390                            ntohs(((struct sockaddr_in6 *)(raddr))->sin6_port));
1391 
1392         rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
1393         if (rv < 0)
1394                 goto error;
1395 
1396         /*
1397          * NOTE: For simplification, connect() is called in blocking
1398          * mode. Might be reconsidered for async connection setup at
1399          * TCP level.
1400          */
1401         rv = kernel_bindconnect(s, laddr, raddr);
1402         if (rv != 0) {
1403                 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
1404                 goto error;
1405         }
1406         if (siw_tcp_nagle == false) {
1407                 int val = 1;
1408 
1409                 rv = kernel_setsockopt(s, SOL_TCP, TCP_NODELAY, (char *)&val,
1410                                        sizeof(val));
1411                 if (rv) {
1412                         siw_dbg_qp(qp, "setsockopt NODELAY error: %d\n", rv);
1413                         goto error;
1414                 }
1415         }
1416         cep = siw_cep_alloc(sdev);
1417         if (!cep) {
1418                 rv = -ENOMEM;
1419                 goto error;
1420         }
1421         siw_cep_set_inuse(cep);
1422 
1423         /* Associate QP with CEP */
1424         siw_cep_get(cep);
1425         qp->cep = cep;
1426 
1427         /* siw_qp_get(qp) already done by QP lookup */
1428         cep->qp = qp;
1429 
1430         id->add_ref(id);
1431         cep->cm_id = id;
1432 
1433         /*
1434          * 4: Allocate a sufficient number of work elements
1435          * to allow concurrent handling of local + peer close
1436          * events, MPA header processing + MPA timeout.
1437          */
1438         rv = siw_cm_alloc_work(cep, 4);
1439         if (rv != 0) {
1440                 rv = -ENOMEM;
1441                 goto error;
1442         }
1443         cep->ird = params->ird;
1444         cep->ord = params->ord;
1445 
1446         if (p2p_mode && cep->ord == 0)
1447                 cep->ord = 1;
1448 
1449         cep->state = SIW_EPSTATE_CONNECTING;
1450 
1451         /*
1452          * Associate CEP with socket
1453          */
1454         siw_cep_socket_assoc(cep, s);
1455 
1456         cep->state = SIW_EPSTATE_AWAIT_MPAREP;
1457 
1458         /*
1459          * Set MPA Request bits: CRC if required, no MPA Markers,
1460          * MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
1461          */
1462         cep->mpa.hdr.params.bits = 0;
1463         if (version > MPA_REVISION_2) {
1464                 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
1465                 version = MPA_REVISION_2;
1466                 /* Adjust also module parameter */
1467                 mpa_version = MPA_REVISION_2;
1468         }
1469         __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
1470 
1471         if (try_gso)
1472                 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
1473 
1474         if (mpa_crc_required)
1475                 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
1476 
1477         /*
1478          * If MPA version == 2:
1479          * o Include ORD and IRD.
1480          * o Indicate peer-to-peer mode, if required by module
1481          *   parameter 'peer_to_peer'.
1482          */
1483         if (version == MPA_REVISION_2) {
1484                 cep->enhanced_rdma_conn_est = true;
1485                 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
1486 
1487                 cep->mpa.v2_ctrl.ird = htons(cep->ird);
1488                 cep->mpa.v2_ctrl.ord = htons(cep->ord);
1489 
1490                 if (p2p_mode) {
1491                         cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
1492                         cep->mpa.v2_ctrl.ord |= rtr_type;
1493                 }
1494                 /* Remember own P2P mode requested */
1495                 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
1496                 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
1497         }
1498         memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
1499 
1500         rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
1501         /*
1502          * Reset private data.
1503          */
1504         cep->mpa.hdr.params.pd_len = 0;
1505 
1506         if (rv >= 0) {
1507                 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
1508                 if (!rv) {
1509                         siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
1510                         siw_cep_set_free(cep);
1511                         return 0;
1512                 }
1513         }
1514 error:
1515         siw_dbg(id->device, "failed: %d\n", rv);
1516 
1517         if (cep) {
1518                 siw_socket_disassoc(s);
1519                 sock_release(s);
1520                 cep->sock = NULL;
1521 
1522                 cep->qp = NULL;
1523 
1524                 cep->cm_id = NULL;
1525                 id->rem_ref(id);
1526                 siw_cep_put(cep);
1527 
1528                 qp->cep = NULL;
1529                 siw_cep_put(cep);
1530 
1531                 cep->state = SIW_EPSTATE_CLOSED;
1532 
1533                 siw_cep_set_free(cep);
1534 
1535                 siw_cep_put(cep);
1536 
1537         } else if (s) {
1538                 sock_release(s);
1539         }
1540         if (qp)
1541                 siw_qp_put(qp);
1542 
1543         return rv;
1544 }
1545 
1546 /*
1547  * siw_accept - Let SoftiWARP accept an RDMA connection request
1548  *
1549  * @id:         New connection management id to be used for accepted
1550  *              connection request
1551  * @params:     Connection parameters provided by ULP for accepting connection
1552  *
1553  * Transition QP to RTS state, associate new CM id @id with accepted CEP
1554  * and get prepared for TCP input by installing socket callbacks.
1555  * Then send MPA Reply and generate the "connection established" event.
1556  * Socket callbacks must be installed before sending MPA Reply, because
1557  * the latter may cause a first RDMA message to arrive from the RDMA Initiator
1558  * side very quickly, at which time the socket callbacks must be ready.
1559  */
1560 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1561 {
1562         struct siw_device *sdev = to_siw_dev(id->device);
1563         struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1564         struct siw_qp *qp;
1565         struct siw_qp_attrs qp_attrs;
1566         int rv, max_priv_data = MPA_MAX_PRIVDATA;
1567         bool wait_for_peer_rts = false;
1568 
1569         siw_cep_set_inuse(cep);
1570         siw_cep_put(cep);
1571 
1572         /* Free lingering inbound private data */
1573         if (cep->mpa.hdr.params.pd_len) {
1574                 cep->mpa.hdr.params.pd_len = 0;
1575                 kfree(cep->mpa.pdata);
1576                 cep->mpa.pdata = NULL;
1577         }
1578         siw_cancel_mpatimer(cep);
1579 
1580         if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1581                 siw_dbg_cep(cep, "out of state\n");
1582 
1583                 siw_cep_set_free(cep);
1584                 siw_cep_put(cep);
1585 
1586                 return -ECONNRESET;
1587         }
1588         qp = siw_qp_id2obj(sdev, params->qpn);
1589         if (!qp) {
1590                 WARN(1, "[QP %d] does not exist\n", params->qpn);
1591                 siw_cep_set_free(cep);
1592                 siw_cep_put(cep);
1593 
1594                 return -EINVAL;
1595         }
1596         down_write(&qp->state_lock);
1597         if (qp->attrs.state > SIW_QP_STATE_RTR) {
1598                 rv = -EINVAL;
1599                 up_write(&qp->state_lock);
1600                 goto error;
1601         }
1602         siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
1603 
1604         if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
1605                 siw_dbg_cep(cep, "peer allows GSO on TX\n");
1606                 qp->tx_ctx.gso_seg_limit = 0;
1607         }
1608         if (params->ord > sdev->attrs.max_ord ||
1609             params->ird > sdev->attrs.max_ird) {
1610                 siw_dbg_cep(
1611                         cep,
1612                         "[QP %u]: ord %d (max %d), ird %d (max %d)\n",
1613                         qp_id(qp), params->ord, sdev->attrs.max_ord,
1614                         params->ird, sdev->attrs.max_ird);
1615                 rv = -EINVAL;
1616                 up_write(&qp->state_lock);
1617                 goto error;
1618         }
1619         if (cep->enhanced_rdma_conn_est)
1620                 max_priv_data -= sizeof(struct mpa_v2_data);
1621 
1622         if (params->private_data_len > max_priv_data) {
1623                 siw_dbg_cep(
1624                         cep,
1625                         "[QP %u]: private data length: %d (max %d)\n",
1626                         qp_id(qp), params->private_data_len, max_priv_data);
1627                 rv = -EINVAL;
1628                 up_write(&qp->state_lock);
1629                 goto error;
1630         }
1631         if (cep->enhanced_rdma_conn_est) {
1632                 if (params->ord > cep->ord) {
1633                         if (relaxed_ird_negotiation) {
1634                                 params->ord = cep->ord;
1635                         } else {
1636                                 cep->ird = params->ird;
1637                                 cep->ord = params->ord;
1638                                 rv = -EINVAL;
1639                                 up_write(&qp->state_lock);
1640                                 goto error;
1641                         }
1642                 }
1643                 if (params->ird < cep->ird) {
1644                         if (relaxed_ird_negotiation &&
1645                             cep->ird <= sdev->attrs.max_ird)
1646                                 params->ird = cep->ird;
1647                         else {
1648                                 rv = -ENOMEM;
1649                                 up_write(&qp->state_lock);
1650                                 goto error;
1651                         }
1652                 }
1653                 if (cep->mpa.v2_ctrl.ord &
1654                     (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
1655                         wait_for_peer_rts = true;
1656                 /*
1657                  * Signal back negotiated IRD and ORD values
1658                  */
1659                 cep->mpa.v2_ctrl.ord =
1660                         htons(params->ord & MPA_IRD_ORD_MASK) |
1661                         (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
1662                 cep->mpa.v2_ctrl.ird =
1663                         htons(params->ird & MPA_IRD_ORD_MASK) |
1664                         (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
1665         }
1666         cep->ird = params->ird;
1667         cep->ord = params->ord;
1668 
1669         cep->cm_id = id;
1670         id->add_ref(id);
1671 
1672         memset(&qp_attrs, 0, sizeof(qp_attrs));
1673         qp_attrs.orq_size = cep->ord;
1674         qp_attrs.irq_size = cep->ird;
1675         qp_attrs.sk = cep->sock;
1676         if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
1677                 qp_attrs.flags = SIW_MPA_CRC;
1678         qp_attrs.state = SIW_QP_STATE_RTS;
1679 
1680         siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
1681 
1682         /* Associate QP with CEP */
1683         siw_cep_get(cep);
1684         qp->cep = cep;
1685 
1686         /* siw_qp_get(qp) already done by QP lookup */
1687         cep->qp = qp;
1688 
1689         cep->state = SIW_EPSTATE_RDMA_MODE;
1690 
1691         /* Move socket RX/TX under QP control */
1692         rv = siw_qp_modify(qp, &qp_attrs,
1693                            SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
1694                                    SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
1695                                    SIW_QP_ATTR_MPA);
1696         up_write(&qp->state_lock);
1697 
1698         if (rv)
1699                 goto error;
1700 
1701         siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
1702                     qp_id(qp), params->private_data_len);
1703 
1704         rv = siw_send_mpareqrep(cep, params->private_data,
1705                                 params->private_data_len);
1706         if (rv != 0)
1707                 goto error;
1708 
1709         if (wait_for_peer_rts) {
1710                 siw_sk_assign_rtr_upcalls(cep);
1711         } else {
1712                 siw_qp_socket_assoc(cep, qp);
1713                 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
1714                 if (rv)
1715                         goto error;
1716         }
1717         siw_cep_set_free(cep);
1718 
1719         return 0;
1720 error:
1721         siw_socket_disassoc(cep->sock);
1722         sock_release(cep->sock);
1723         cep->sock = NULL;
1724 
1725         cep->state = SIW_EPSTATE_CLOSED;
1726 
1727         if (cep->cm_id) {
1728                 cep->cm_id->rem_ref(id);
1729                 cep->cm_id = NULL;
1730         }
1731         if (qp->cep) {
1732                 siw_cep_put(cep);
1733                 qp->cep = NULL;
1734         }
1735         cep->qp = NULL;
1736         siw_qp_put(qp);
1737 
1738         siw_cep_set_free(cep);
1739         siw_cep_put(cep);
1740 
1741         return rv;
1742 }
1743 
1744 /*
1745  * siw_reject()
1746  *
1747  * Local connection reject case. Send private data back to peer,
1748  * close connection and dereference connection id.
1749  */
1750 int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
1751 {
1752         struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1753 
1754         siw_cep_set_inuse(cep);
1755         siw_cep_put(cep);
1756 
1757         siw_cancel_mpatimer(cep);
1758 
1759         if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1760                 siw_dbg_cep(cep, "out of state\n");
1761 
1762                 siw_cep_set_free(cep);
1763                 siw_cep_put(cep); /* put last reference */
1764 
1765                 return -ECONNRESET;
1766         }
1767         siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
1768                     pd_len);
1769 
1770         if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
1771                 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
1772                 siw_send_mpareqrep(cep, pdata, pd_len);
1773         }
1774         siw_socket_disassoc(cep->sock);
1775         sock_release(cep->sock);
1776         cep->sock = NULL;
1777 
1778         cep->state = SIW_EPSTATE_CLOSED;
1779 
1780         siw_cep_set_free(cep);
1781         siw_cep_put(cep);
1782 
1783         return 0;
1784 }
1785 
1786 /*
1787  * siw_create_listen - Create resources for a listener's IWCM ID @id
1788  *
1789  * Starts listen on the socket address id->local_addr.
1790  *
1791  */
1792 int siw_create_listen(struct iw_cm_id *id, int backlog)
1793 {
1794         struct socket *s;
1795         struct siw_cep *cep = NULL;
1796         struct siw_device *sdev = to_siw_dev(id->device);
1797         int addr_family = id->local_addr.ss_family;
1798         int rv = 0, s_val;
1799 
1800         if (addr_family != AF_INET && addr_family != AF_INET6)
1801                 return -EAFNOSUPPORT;
1802 
1803         rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
1804         if (rv < 0)
1805                 return rv;
1806 
1807         /*
1808          * Allow binding local port when still in TIME_WAIT from last close.
1809          */
1810         s_val = 1;
1811         rv = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
1812                                sizeof(s_val));
1813         if (rv) {
1814                 siw_dbg(id->device, "setsockopt error: %d\n", rv);
1815                 goto error;
1816         }
1817         if (addr_family == AF_INET) {
1818                 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
1819 
1820                 /* For wildcard addr, limit binding to current device only */
1821                 if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
1822                         s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1823 
1824                 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1825                                   sizeof(struct sockaddr_in));
1826         } else {
1827                 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
1828 
1829                 /* For wildcard addr, limit binding to current device only */
1830                 if (ipv6_addr_any(&laddr->sin6_addr))
1831                         s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1832 
1833                 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1834                                   sizeof(struct sockaddr_in6));
1835         }
1836         if (rv) {
1837                 siw_dbg(id->device, "socket bind error: %d\n", rv);
1838                 goto error;
1839         }
1840         cep = siw_cep_alloc(sdev);
1841         if (!cep) {
1842                 rv = -ENOMEM;
1843                 goto error;
1844         }
1845         siw_cep_socket_assoc(cep, s);
1846 
1847         rv = siw_cm_alloc_work(cep, backlog);
1848         if (rv) {
1849                 siw_dbg(id->device,
1850                         "alloc_work error %d, backlog %d\n",
1851                         rv, backlog);
1852                 goto error;
1853         }
1854         rv = s->ops->listen(s, backlog);
1855         if (rv) {
1856                 siw_dbg(id->device, "listen error %d\n", rv);
1857                 goto error;
1858         }
1859         cep->cm_id = id;
1860         id->add_ref(id);
1861 
1862         /*
1863          * In case of a wildcard rdma_listen on a multi-homed device,
1864          * a listener's IWCM id is associated with more than one listening CEP.
1865          *
1866          * We currently use id->provider_data in three different ways:
1867          *
1868          * o For a listener's IWCM id, id->provider_data points to
1869          *   the list_head of the list of listening CEPs.
1870          *   Uses: siw_create_listen(), siw_destroy_listen()
1871          *
1872          * o For each accepted passive-side IWCM id, id->provider_data
1873          *   points to the CEP itself. This is a consequence of
1874          *   - siw_cm_upcall() setting event.provider_data = cep and
1875          *   - the IWCM's cm_conn_req_handler() setting provider_data of the
1876          *     new passive-side IWCM id equal to event.provider_data
1877          *   Uses: siw_accept(), siw_reject()
1878          *
1879          * o For an active-side IWCM id, id->provider_data is not used at all.
1880          *
1881          */
1882         if (!id->provider_data) {
1883                 id->provider_data =
1884                         kmalloc(sizeof(struct list_head), GFP_KERNEL);
1885                 if (!id->provider_data) {
1886                         rv = -ENOMEM;
1887                         goto error;
1888                 }
1889                 INIT_LIST_HEAD((struct list_head *)id->provider_data);
1890         }
1891         list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
1892         cep->state = SIW_EPSTATE_LISTENING;
1893 
1894         siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
1895 
1896         return 0;
1897 
1898 error:
1899         siw_dbg(id->device, "failed: %d\n", rv);
1900 
1901         if (cep) {
1902                 siw_cep_set_inuse(cep);
1903 
1904                 if (cep->cm_id) {
1905                         cep->cm_id->rem_ref(cep->cm_id);
1906                         cep->cm_id = NULL;
1907                 }
1908                 cep->sock = NULL;
1909                 siw_socket_disassoc(s);
1910                 cep->state = SIW_EPSTATE_CLOSED;
1911 
1912                 siw_cep_set_free(cep);
1913                 siw_cep_put(cep);
1914         }
1915         sock_release(s);
1916 
1917         return rv;
1918 }
1919 
1920 static void siw_drop_listeners(struct iw_cm_id *id)
1921 {
1922         struct list_head *p, *tmp;
1923 
1924         /*
1925          * In case of a wildcard rdma_listen on a multi-homed device,
1926          * a listener's IWCM id is associated with more than one listening CEP.
1927          */
1928         list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
1929                 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
1930 
1931                 list_del(p);
1932 
1933                 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
1934 
1935                 siw_cep_set_inuse(cep);
1936 
1937                 if (cep->cm_id) {
1938                         cep->cm_id->rem_ref(cep->cm_id);
1939                         cep->cm_id = NULL;
1940                 }
1941                 if (cep->sock) {
1942                         siw_socket_disassoc(cep->sock);
1943                         sock_release(cep->sock);
1944                         cep->sock = NULL;
1945                 }
1946                 cep->state = SIW_EPSTATE_CLOSED;
1947                 siw_cep_set_free(cep);
1948                 siw_cep_put(cep);
1949         }
1950 }
1951 
1952 int siw_destroy_listen(struct iw_cm_id *id)
1953 {
1954         if (!id->provider_data) {
1955                 siw_dbg(id->device, "no cep(s)\n");
1956                 return 0;
1957         }
1958         siw_drop_listeners(id);
1959         kfree(id->provider_data);
1960         id->provider_data = NULL;
1961 
1962         return 0;
1963 }
1964 
1965 int siw_cm_init(void)
1966 {
1967         /*
1968          * create_single_workqueue for strict ordering
1969          */
1970         siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
1971         if (!siw_cm_wq)
1972                 return -ENOMEM;
1973 
1974         return 0;
1975 }
1976 
1977 void siw_cm_exit(void)
1978 {
1979         if (siw_cm_wq) {
1980                 flush_workqueue(siw_cm_wq);
1981                 destroy_workqueue(siw_cm_wq);
1982         }
1983 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/sw/siw/siw_cm.c

DEFINITIONS
