drivers/infiniband/sw/siw/siw

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This source file includes following definitions.
siw_device_register
siw_device_cleanup
siw_create_tx_threads
siw_dev_qualified
siw_init_cpulist
siw_destroy_cpulist
siw_get_tx_cpu
siw_put_tx_cpu
siw_get_base_qp
siw_device_create
siw_netdev_down
siw_device_goes_down
siw_netdev_event
siw_newlink
siw_init_module
siw_exit_module
   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2 
   3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4 /* Copyright (c) 2008-2019, IBM Corporation */
   5 
   6 #include <linux/init.h>
   7 #include <linux/errno.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/inetdevice.h>
  10 #include <net/net_namespace.h>
  11 #include <linux/rtnetlink.h>
  12 #include <linux/if_arp.h>
  13 #include <linux/list.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/module.h>
  17 #include <linux/dma-mapping.h>
  18 
  19 #include <rdma/ib_verbs.h>
  20 #include <rdma/ib_user_verbs.h>
  21 #include <rdma/rdma_netlink.h>
  22 #include <linux/kthread.h>
  23 
  24 #include "siw.h"
  25 #include "siw_verbs.h"
  26 
  27 MODULE_AUTHOR("Bernard Metzler");
  28 MODULE_DESCRIPTION("Software iWARP Driver");
  29 MODULE_LICENSE("Dual BSD/GPL");
  30 
  31 /* transmit from user buffer, if possible */
  32 const bool zcopy_tx = true;
  33 
  34 /* Restrict usage of GSO, if hardware peer iwarp is unable to process
  35  * large packets. try_gso = true lets siw try to use local GSO,
  36  * if peer agrees.  Not using GSO severly limits siw maximum tx bandwidth.
  37  */
  38 const bool try_gso;
  39 
  40 /* Attach siw also with loopback devices */
  41 const bool loopback_enabled = true;
  42 
  43 /* We try to negotiate CRC on, if true */
  44 const bool mpa_crc_required;
  45 
  46 /* MPA CRC on/off enforced */
  47 const bool mpa_crc_strict;
  48 
  49 /* Control TCP_NODELAY socket option */
  50 const bool siw_tcp_nagle;
  51 
  52 /* Select MPA version to be used during connection setup */
  53 u_char mpa_version = MPA_REVISION_2;
  54 
  55 /* Selects MPA P2P mode (additional handshake during connection
  56  * setup, if true.
  57  */
  58 const bool peer_to_peer;
  59 
  60 struct task_struct *siw_tx_thread[NR_CPUS];
  61 struct crypto_shash *siw_crypto_shash;
  62 
  63 static int siw_device_register(struct siw_device *sdev, const char *name)
  64 {
  65         struct ib_device *base_dev = &sdev->base_dev;
  66         static int dev_id = 1;
  67         int rv;
  68 
  69         rv = ib_register_device(base_dev, name);
  70         if (rv) {
  71                 pr_warn("siw: device registration error %d\n", rv);
  72                 return rv;
  73         }
  74         sdev->vendor_part_id = dev_id++;
  75 
  76         siw_dbg(base_dev, "HWaddr=%pM\n", sdev->netdev->dev_addr);
  77 
  78         return 0;
  79 }
  80 
  81 static void siw_device_cleanup(struct ib_device *base_dev)
  82 {
  83         struct siw_device *sdev = to_siw_dev(base_dev);
  84 
  85         xa_destroy(&sdev->qp_xa);
  86         xa_destroy(&sdev->mem_xa);
  87 }
  88 
  89 static int siw_create_tx_threads(void)
  90 {
  91         int cpu, assigned = 0;
  92 
  93         for_each_online_cpu(cpu) {
  94                 /* Skip HT cores */
  95                 if (cpu % cpumask_weight(topology_sibling_cpumask(cpu)))
  96                         continue;
  97 
  98                 siw_tx_thread[cpu] =
  99                         kthread_create(siw_run_sq, (unsigned long *)(long)cpu,
 100                                        "siw_tx/%d", cpu);
 101                 if (IS_ERR(siw_tx_thread[cpu])) {
 102                         siw_tx_thread[cpu] = NULL;
 103                         continue;
 104                 }
 105                 kthread_bind(siw_tx_thread[cpu], cpu);
 106 
 107                 wake_up_process(siw_tx_thread[cpu]);
 108                 assigned++;
 109         }
 110         return assigned;
 111 }
 112 
 113 static int siw_dev_qualified(struct net_device *netdev)
 114 {
 115         /*
 116          * Additional hardware support can be added here
 117          * (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see
 118          * <linux/if_arp.h> for type identifiers.
 119          */
 120         if (netdev->type == ARPHRD_ETHER || netdev->type == ARPHRD_IEEE802 ||
 121             (netdev->type == ARPHRD_LOOPBACK && loopback_enabled))
 122                 return 1;
 123 
 124         return 0;
 125 }
 126 
 127 static DEFINE_PER_CPU(atomic_t, siw_use_cnt);
 128 
 129 static struct {
 130         struct cpumask **tx_valid_cpus;
 131         int num_nodes;
 132 } siw_cpu_info;
 133 
 134 static int siw_init_cpulist(void)
 135 {
 136         int i, num_nodes = num_possible_nodes();
 137 
 138         memset(siw_tx_thread, 0, sizeof(siw_tx_thread));
 139 
 140         siw_cpu_info.num_nodes = num_nodes;
 141 
 142         siw_cpu_info.tx_valid_cpus =
 143                 kcalloc(num_nodes, sizeof(struct cpumask *), GFP_KERNEL);
 144         if (!siw_cpu_info.tx_valid_cpus) {
 145                 siw_cpu_info.num_nodes = 0;
 146                 return -ENOMEM;
 147         }
 148         for (i = 0; i < siw_cpu_info.num_nodes; i++) {
 149                 siw_cpu_info.tx_valid_cpus[i] =
 150                         kzalloc(sizeof(struct cpumask), GFP_KERNEL);
 151                 if (!siw_cpu_info.tx_valid_cpus[i])
 152                         goto out_err;
 153 
 154                 cpumask_clear(siw_cpu_info.tx_valid_cpus[i]);
 155         }
 156         for_each_possible_cpu(i)
 157                 cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]);
 158 
 159         return 0;
 160 
 161 out_err:
 162         siw_cpu_info.num_nodes = 0;
 163         while (--i >= 0)
 164                 kfree(siw_cpu_info.tx_valid_cpus[i]);
 165         kfree(siw_cpu_info.tx_valid_cpus);
 166         siw_cpu_info.tx_valid_cpus = NULL;
 167 
 168         return -ENOMEM;
 169 }
 170 
 171 static void siw_destroy_cpulist(void)
 172 {
 173         int i = 0;
 174 
 175         while (i < siw_cpu_info.num_nodes)
 176                 kfree(siw_cpu_info.tx_valid_cpus[i++]);
 177 
 178         kfree(siw_cpu_info.tx_valid_cpus);
 179 }
 180 
 181 /*
 182  * Choose CPU with least number of active QP's from NUMA node of
 183  * TX interface.
 184  */
 185 int siw_get_tx_cpu(struct siw_device *sdev)
 186 {
 187         const struct cpumask *tx_cpumask;
 188         int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1;
 189 
 190         if (node < 0)
 191                 tx_cpumask = cpu_online_mask;
 192         else
 193                 tx_cpumask = siw_cpu_info.tx_valid_cpus[node];
 194 
 195         num_cpus = cpumask_weight(tx_cpumask);
 196         if (!num_cpus) {
 197                 /* no CPU on this NUMA node */
 198                 tx_cpumask = cpu_online_mask;
 199                 num_cpus = cpumask_weight(tx_cpumask);
 200         }
 201         if (!num_cpus)
 202                 goto out;
 203 
 204         cpu = cpumask_first(tx_cpumask);
 205 
 206         for (i = 0, min_use = SIW_MAX_QP; i < num_cpus;
 207              i++, cpu = cpumask_next(cpu, tx_cpumask)) {
 208                 int usage;
 209 
 210                 /* Skip any cores which have no TX thread */
 211                 if (!siw_tx_thread[cpu])
 212                         continue;
 213 
 214                 usage = atomic_read(&per_cpu(siw_use_cnt, cpu));
 215                 if (usage <= min_use) {
 216                         tx_cpu = cpu;
 217                         min_use = usage;
 218                 }
 219         }
 220         siw_dbg(&sdev->base_dev,
 221                 "tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use);
 222 
 223 out:
 224         if (tx_cpu >= 0)
 225                 atomic_inc(&per_cpu(siw_use_cnt, tx_cpu));
 226         else
 227                 pr_warn("siw: no tx cpu found\n");
 228 
 229         return tx_cpu;
 230 }
 231 
 232 void siw_put_tx_cpu(int cpu)
 233 {
 234         atomic_dec(&per_cpu(siw_use_cnt, cpu));
 235 }
 236 
 237 static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id)
 238 {
 239         struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id);
 240 
 241         if (qp) {
 242                 /*
 243                  * siw_qp_id2obj() increments object reference count
 244                  */
 245                 siw_qp_put(qp);
 246                 return qp->ib_qp;
 247         }
 248         return NULL;
 249 }
 250 
 251 static const struct ib_device_ops siw_device_ops = {
 252         .owner = THIS_MODULE,
 253         .uverbs_abi_ver = SIW_ABI_VERSION,
 254         .driver_id = RDMA_DRIVER_SIW,
 255 
 256         .alloc_mr = siw_alloc_mr,
 257         .alloc_pd = siw_alloc_pd,
 258         .alloc_ucontext = siw_alloc_ucontext,
 259         .create_cq = siw_create_cq,
 260         .create_qp = siw_create_qp,
 261         .create_srq = siw_create_srq,
 262         .dealloc_driver = siw_device_cleanup,
 263         .dealloc_pd = siw_dealloc_pd,
 264         .dealloc_ucontext = siw_dealloc_ucontext,
 265         .dereg_mr = siw_dereg_mr,
 266         .destroy_cq = siw_destroy_cq,
 267         .destroy_qp = siw_destroy_qp,
 268         .destroy_srq = siw_destroy_srq,
 269         .get_dma_mr = siw_get_dma_mr,
 270         .get_port_immutable = siw_get_port_immutable,
 271         .iw_accept = siw_accept,
 272         .iw_add_ref = siw_qp_get_ref,
 273         .iw_connect = siw_connect,
 274         .iw_create_listen = siw_create_listen,
 275         .iw_destroy_listen = siw_destroy_listen,
 276         .iw_get_qp = siw_get_base_qp,
 277         .iw_reject = siw_reject,
 278         .iw_rem_ref = siw_qp_put_ref,
 279         .map_mr_sg = siw_map_mr_sg,
 280         .mmap = siw_mmap,
 281         .modify_qp = siw_verbs_modify_qp,
 282         .modify_srq = siw_modify_srq,
 283         .poll_cq = siw_poll_cq,
 284         .post_recv = siw_post_receive,
 285         .post_send = siw_post_send,
 286         .post_srq_recv = siw_post_srq_recv,
 287         .query_device = siw_query_device,
 288         .query_gid = siw_query_gid,
 289         .query_pkey = siw_query_pkey,
 290         .query_port = siw_query_port,
 291         .query_qp = siw_query_qp,
 292         .query_srq = siw_query_srq,
 293         .req_notify_cq = siw_req_notify_cq,
 294         .reg_user_mr = siw_reg_user_mr,
 295 
 296         INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq),
 297         INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd),
 298         INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq),
 299         INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext),
 300 };
 301 
 302 static struct siw_device *siw_device_create(struct net_device *netdev)
 303 {
 304         struct siw_device *sdev = NULL;
 305         struct ib_device *base_dev;
 306         struct device *parent = netdev->dev.parent;
 307         int rv;
 308 
 309         if (!parent) {
 310                 /*
 311                  * The loopback device has no parent device,
 312                  * so it appears as a top-level device. To support
 313                  * loopback device connectivity, take this device
 314                  * as the parent device. Skip all other devices
 315                  * w/o parent device.
 316                  */
 317                 if (netdev->type != ARPHRD_LOOPBACK) {
 318                         pr_warn("siw: device %s error: no parent device\n",
 319                                 netdev->name);
 320                         return NULL;
 321                 }
 322                 parent = &netdev->dev;
 323         }
 324         sdev = ib_alloc_device(siw_device, base_dev);
 325         if (!sdev)
 326                 return NULL;
 327 
 328         base_dev = &sdev->base_dev;
 329 
 330         sdev->netdev = netdev;
 331 
 332         if (netdev->type != ARPHRD_LOOPBACK) {
 333                 memcpy(&base_dev->node_guid, netdev->dev_addr, 6);
 334         } else {
 335                 /*
 336                  * The loopback device does not have a HW address,
 337                  * but connection mangagement lib expects gid != 0
 338                  */
 339                 size_t gidlen = min_t(size_t, strlen(base_dev->name), 6);
 340 
 341                 memcpy(&base_dev->node_guid, base_dev->name, gidlen);
 342         }
 343         base_dev->uverbs_cmd_mask =
 344                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
 345                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
 346                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
 347                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
 348                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
 349                 (1ull << IB_USER_VERBS_CMD_REG_MR) |
 350                 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
 351                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 352                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
 353                 (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
 354                 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
 355                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
 356                 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
 357                 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
 358                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
 359                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
 360                 (1ull << IB_USER_VERBS_CMD_POST_SEND) |
 361                 (1ull << IB_USER_VERBS_CMD_POST_RECV) |
 362                 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
 363                 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV) |
 364                 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
 365                 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
 366                 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);
 367 
 368         base_dev->node_type = RDMA_NODE_RNIC;
 369         memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON,
 370                sizeof(SIW_NODE_DESC_COMMON));
 371 
 372         /*
 373          * Current model (one-to-one device association):
 374          * One Softiwarp device per net_device or, equivalently,
 375          * per physical port.
 376          */
 377         base_dev->phys_port_cnt = 1;
 378         base_dev->dev.parent = parent;
 379         base_dev->dev.dma_ops = &dma_virt_ops;
 380         base_dev->num_comp_vectors = num_possible_cpus();
 381 
 382         xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1);
 383         xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1);
 384 
 385         ib_set_device_ops(base_dev, &siw_device_ops);
 386         rv = ib_device_set_netdev(base_dev, netdev, 1);
 387         if (rv)
 388                 goto error;
 389 
 390         memcpy(base_dev->iw_ifname, netdev->name,
 391                sizeof(base_dev->iw_ifname));
 392 
 393         /* Disable TCP port mapping */
 394         base_dev->iw_driver_flags = IW_F_NO_PORT_MAP,
 395 
 396         sdev->attrs.max_qp = SIW_MAX_QP;
 397         sdev->attrs.max_qp_wr = SIW_MAX_QP_WR;
 398         sdev->attrs.max_ord = SIW_MAX_ORD_QP;
 399         sdev->attrs.max_ird = SIW_MAX_IRD_QP;
 400         sdev->attrs.max_sge = SIW_MAX_SGE;
 401         sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD;
 402         sdev->attrs.max_cq = SIW_MAX_CQ;
 403         sdev->attrs.max_cqe = SIW_MAX_CQE;
 404         sdev->attrs.max_mr = SIW_MAX_MR;
 405         sdev->attrs.max_pd = SIW_MAX_PD;
 406         sdev->attrs.max_mw = SIW_MAX_MW;
 407         sdev->attrs.max_fmr = SIW_MAX_FMR;
 408         sdev->attrs.max_srq = SIW_MAX_SRQ;
 409         sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR;
 410         sdev->attrs.max_srq_sge = SIW_MAX_SGE;
 411 
 412         INIT_LIST_HEAD(&sdev->cep_list);
 413         INIT_LIST_HEAD(&sdev->qp_list);
 414 
 415         atomic_set(&sdev->num_ctx, 0);
 416         atomic_set(&sdev->num_srq, 0);
 417         atomic_set(&sdev->num_qp, 0);
 418         atomic_set(&sdev->num_cq, 0);
 419         atomic_set(&sdev->num_mr, 0);
 420         atomic_set(&sdev->num_pd, 0);
 421 
 422         sdev->numa_node = dev_to_node(parent);
 423         spin_lock_init(&sdev->lock);
 424 
 425         return sdev;
 426 error:
 427         ib_dealloc_device(base_dev);
 428 
 429         return NULL;
 430 }
 431 
 432 /*
 433  * Network link becomes unavailable. Mark all
 434  * affected QP's accordingly.
 435  */
 436 static void siw_netdev_down(struct work_struct *work)
 437 {
 438         struct siw_device *sdev =
 439                 container_of(work, struct siw_device, netdev_down);
 440 
 441         struct siw_qp_attrs qp_attrs;
 442         struct list_head *pos, *tmp;
 443 
 444         memset(&qp_attrs, 0, sizeof(qp_attrs));
 445         qp_attrs.state = SIW_QP_STATE_ERROR;
 446 
 447         list_for_each_safe(pos, tmp, &sdev->qp_list) {
 448                 struct siw_qp *qp = list_entry(pos, struct siw_qp, devq);
 449 
 450                 down_write(&qp->state_lock);
 451                 WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE));
 452                 up_write(&qp->state_lock);
 453         }
 454         ib_device_put(&sdev->base_dev);
 455 }
 456 
 457 static void siw_device_goes_down(struct siw_device *sdev)
 458 {
 459         if (ib_device_try_get(&sdev->base_dev)) {
 460                 INIT_WORK(&sdev->netdev_down, siw_netdev_down);
 461                 schedule_work(&sdev->netdev_down);
 462         }
 463 }
 464 
 465 static int siw_netdev_event(struct notifier_block *nb, unsigned long event,
 466                             void *arg)
 467 {
 468         struct net_device *netdev = netdev_notifier_info_to_dev(arg);
 469         struct ib_device *base_dev;
 470         struct siw_device *sdev;
 471 
 472         dev_dbg(&netdev->dev, "siw: event %lu\n", event);
 473 
 474         if (dev_net(netdev) != &init_net)
 475                 return NOTIFY_OK;
 476 
 477         base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
 478         if (!base_dev)
 479                 return NOTIFY_OK;
 480 
 481         sdev = to_siw_dev(base_dev);
 482 
 483         switch (event) {
 484         case NETDEV_UP:
 485                 sdev->state = IB_PORT_ACTIVE;
 486                 siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE);
 487                 break;
 488 
 489         case NETDEV_GOING_DOWN:
 490                 siw_device_goes_down(sdev);
 491                 break;
 492 
 493         case NETDEV_DOWN:
 494                 sdev->state = IB_PORT_DOWN;
 495                 siw_port_event(sdev, 1, IB_EVENT_PORT_ERR);
 496                 break;
 497 
 498         case NETDEV_REGISTER:
 499                 /*
 500                  * Device registration now handled only by
 501                  * rdma netlink commands. So it shall be impossible
 502                  * to end up here with a valid siw device.
 503                  */
 504                 siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n");
 505                 break;
 506 
 507         case NETDEV_UNREGISTER:
 508                 ib_unregister_device_queued(&sdev->base_dev);
 509                 break;
 510 
 511         case NETDEV_CHANGEADDR:
 512                 siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE);
 513                 break;
 514         /*
 515          * Todo: Below netdev events are currently not handled.
 516          */
 517         case NETDEV_CHANGEMTU:
 518         case NETDEV_CHANGE:
 519                 break;
 520 
 521         default:
 522                 break;
 523         }
 524         ib_device_put(&sdev->base_dev);
 525 
 526         return NOTIFY_OK;
 527 }
 528 
 529 static struct notifier_block siw_netdev_nb = {
 530         .notifier_call = siw_netdev_event,
 531 };
 532 
 533 static int siw_newlink(const char *basedev_name, struct net_device *netdev)
 534 {
 535         struct ib_device *base_dev;
 536         struct siw_device *sdev = NULL;
 537         int rv = -ENOMEM;
 538 
 539         if (!siw_dev_qualified(netdev))
 540                 return -EINVAL;
 541 
 542         base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
 543         if (base_dev) {
 544                 ib_device_put(base_dev);
 545                 return -EEXIST;
 546         }
 547         sdev = siw_device_create(netdev);
 548         if (sdev) {
 549                 dev_dbg(&netdev->dev, "siw: new device\n");
 550 
 551                 if (netif_running(netdev) && netif_carrier_ok(netdev))
 552                         sdev->state = IB_PORT_ACTIVE;
 553                 else
 554                         sdev->state = IB_PORT_DOWN;
 555 
 556                 rv = siw_device_register(sdev, basedev_name);
 557                 if (rv)
 558                         ib_dealloc_device(&sdev->base_dev);
 559         }
 560         return rv;
 561 }
 562 
 563 static struct rdma_link_ops siw_link_ops = {
 564         .type = "siw",
 565         .newlink = siw_newlink,
 566 };
 567 
 568 /*
 569  * siw_init_module - Initialize Softiwarp module and register with netdev
 570  *                   subsystem.
 571  */
 572 static __init int siw_init_module(void)
 573 {
 574         int rv;
 575         int nr_cpu;
 576 
 577         if (SENDPAGE_THRESH < SIW_MAX_INLINE) {
 578                 pr_info("siw: sendpage threshold too small: %u\n",
 579                         (int)SENDPAGE_THRESH);
 580                 rv = -EINVAL;
 581                 goto out_error;
 582         }
 583         rv = siw_init_cpulist();
 584         if (rv)
 585                 goto out_error;
 586 
 587         rv = siw_cm_init();
 588         if (rv)
 589                 goto out_error;
 590 
 591         if (!siw_create_tx_threads()) {
 592                 pr_info("siw: Could not start any TX thread\n");
 593                 rv = -ENOMEM;
 594                 goto out_error;
 595         }
 596         /*
 597          * Locate CRC32 algorithm. If unsuccessful, fail
 598          * loading siw only, if CRC is required.
 599          */
 600         siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0);
 601         if (IS_ERR(siw_crypto_shash)) {
 602                 pr_info("siw: Loading CRC32c failed: %ld\n",
 603                         PTR_ERR(siw_crypto_shash));
 604                 siw_crypto_shash = NULL;
 605                 if (mpa_crc_required) {
 606                         rv = -EOPNOTSUPP;
 607                         goto out_error;
 608                 }
 609         }
 610         rv = register_netdevice_notifier(&siw_netdev_nb);
 611         if (rv)
 612                 goto out_error;
 613 
 614         rdma_link_register(&siw_link_ops);
 615 
 616         pr_info("SoftiWARP attached\n");
 617         return 0;
 618 
 619 out_error:
 620         for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) {
 621                 if (siw_tx_thread[nr_cpu]) {
 622                         siw_stop_tx_thread(nr_cpu);
 623                         siw_tx_thread[nr_cpu] = NULL;
 624                 }
 625         }
 626         if (siw_crypto_shash)
 627                 crypto_free_shash(siw_crypto_shash);
 628 
 629         pr_info("SoftIWARP attach failed. Error: %d\n", rv);
 630 
 631         siw_cm_exit();
 632         siw_destroy_cpulist();
 633 
 634         return rv;
 635 }
 636 
 637 static void __exit siw_exit_module(void)
 638 {
 639         int cpu;
 640 
 641         for_each_possible_cpu(cpu) {
 642                 if (siw_tx_thread[cpu]) {
 643                         siw_stop_tx_thread(cpu);
 644                         siw_tx_thread[cpu] = NULL;
 645                 }
 646         }
 647         unregister_netdevice_notifier(&siw_netdev_nb);
 648         rdma_link_unregister(&siw_link_ops);
 649         ib_unregister_driver(RDMA_DRIVER_SIW);
 650 
 651         siw_cm_exit();
 652 
 653         siw_destroy_cpulist();
 654 
 655         if (siw_crypto_shash)
 656                 crypto_free_shash(siw_crypto_shash);
 657 
 658         pr_info("SoftiWARP detached\n");
 659 }
 660 
 661 module_init(siw_init_module);
 662 module_exit(siw_exit_module);
 663 
 664 MODULE_ALIAS_RDMA_LINK("siw");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/sw/siw/siw_main.c

DEFINITIONS
