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) { 164 kfree(siw_cpu_info.tx_valid_cpus[i]); 165 siw_cpu_info.tx_valid_cpus[i--] = NULL; 166 } 167 kfree(siw_cpu_info.tx_valid_cpus); 168 siw_cpu_info.tx_valid_cpus = NULL; 169 170 return -ENOMEM; 171 } 172 173 static void siw_destroy_cpulist(void) 174 { 175 int i = 0; 176 177 while (i < siw_cpu_info.num_nodes) 178 kfree(siw_cpu_info.tx_valid_cpus[i++]); 179 180 kfree(siw_cpu_info.tx_valid_cpus); 181 } 182 183 /* 184 * Choose CPU with least number of active QP's from NUMA node of 185 * TX interface. 186 */ 187 int siw_get_tx_cpu(struct siw_device *sdev) 188 { 189 const struct cpumask *tx_cpumask; 190 int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1; 191 192 if (node < 0) 193 tx_cpumask = cpu_online_mask; 194 else 195 tx_cpumask = siw_cpu_info.tx_valid_cpus[node]; 196 197 num_cpus = cpumask_weight(tx_cpumask); 198 if (!num_cpus) { 199 /* no CPU on this NUMA node */ 200 tx_cpumask = cpu_online_mask; 201 num_cpus = cpumask_weight(tx_cpumask); 202 } 203 if (!num_cpus) 204 goto out; 205 206 cpu = cpumask_first(tx_cpumask); 207 208 for (i = 0, min_use = SIW_MAX_QP; i < num_cpus; 209 i++, cpu = cpumask_next(cpu, tx_cpumask)) { 210 int usage; 211 212 /* Skip any cores which have no TX thread */ 213 if (!siw_tx_thread[cpu]) 214 continue; 215 216 usage = atomic_read(&per_cpu(siw_use_cnt, cpu)); 217 if (usage <= min_use) { 218 tx_cpu = cpu; 219 min_use = usage; 220 } 221 } 222 siw_dbg(&sdev->base_dev, 223 "tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use); 224 225 out: 226 if (tx_cpu >= 0) 227 atomic_inc(&per_cpu(siw_use_cnt, tx_cpu)); 228 else 229 pr_warn("siw: no tx cpu found\n"); 230 231 return tx_cpu; 232 } 233 234 void siw_put_tx_cpu(int cpu) 235 { 236 atomic_dec(&per_cpu(siw_use_cnt, cpu)); 237 } 238 239 static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id) 240 { 241 struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id); 242 243 if (qp) { 244 /* 245 * siw_qp_id2obj() increments object reference count 246 */ 247 siw_qp_put(qp); 248 return qp->ib_qp; 249 } 250 return NULL; 251 } 252 253 static void siw_verbs_sq_flush(struct ib_qp *base_qp) 254 { 255 struct siw_qp *qp = to_siw_qp(base_qp); 256 257 down_write(&qp->state_lock); 258 siw_sq_flush(qp); 259 up_write(&qp->state_lock); 260 } 261 262 static void siw_verbs_rq_flush(struct ib_qp *base_qp) 263 { 264 struct siw_qp *qp = to_siw_qp(base_qp); 265 266 down_write(&qp->state_lock); 267 siw_rq_flush(qp); 268 up_write(&qp->state_lock); 269 } 270 271 static const struct ib_device_ops siw_device_ops = { 272 .owner = THIS_MODULE, 273 .uverbs_abi_ver = SIW_ABI_VERSION, 274 .driver_id = RDMA_DRIVER_SIW, 275 276 .alloc_mr = siw_alloc_mr, 277 .alloc_pd = siw_alloc_pd, 278 .alloc_ucontext = siw_alloc_ucontext, 279 .create_cq = siw_create_cq, 280 .create_qp = siw_create_qp, 281 .create_srq = siw_create_srq, 282 .dealloc_driver = siw_device_cleanup, 283 .dealloc_pd = siw_dealloc_pd, 284 .dealloc_ucontext = siw_dealloc_ucontext, 285 .dereg_mr = siw_dereg_mr, 286 .destroy_cq = siw_destroy_cq, 287 .destroy_qp = siw_destroy_qp, 288 .destroy_srq = siw_destroy_srq, 289 .drain_rq = siw_verbs_rq_flush, 290 .drain_sq = siw_verbs_sq_flush, 291 .get_dma_mr = siw_get_dma_mr, 292 .get_port_immutable = siw_get_port_immutable, 293 .iw_accept = siw_accept, 294 .iw_add_ref = siw_qp_get_ref, 295 .iw_connect = siw_connect, 296 .iw_create_listen = siw_create_listen, 297 .iw_destroy_listen = siw_destroy_listen, 298 .iw_get_qp = siw_get_base_qp, 299 .iw_reject = siw_reject, 300 .iw_rem_ref = siw_qp_put_ref, 301 .map_mr_sg = siw_map_mr_sg, 302 .mmap = siw_mmap, 303 .modify_qp = siw_verbs_modify_qp, 304 .modify_srq = siw_modify_srq, 305 .poll_cq = siw_poll_cq, 306 .post_recv = siw_post_receive, 307 .post_send = siw_post_send, 308 .post_srq_recv = siw_post_srq_recv, 309 .query_device = siw_query_device, 310 .query_gid = siw_query_gid, 311 .query_pkey = siw_query_pkey, 312 .query_port = siw_query_port, 313 .query_qp = siw_query_qp, 314 .query_srq = siw_query_srq, 315 .req_notify_cq = siw_req_notify_cq, 316 .reg_user_mr = siw_reg_user_mr, 317 318 INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq), 319 INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd), 320 INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq), 321 INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext), 322 }; 323 324 static struct siw_device *siw_device_create(struct net_device *netdev) 325 { 326 struct siw_device *sdev = NULL; 327 struct ib_device *base_dev; 328 struct device *parent = netdev->dev.parent; 329 int rv; 330 331 if (!parent) { 332 /* 333 * The loopback device has no parent device, 334 * so it appears as a top-level device. To support 335 * loopback device connectivity, take this device 336 * as the parent device. Skip all other devices 337 * w/o parent device. 338 */ 339 if (netdev->type != ARPHRD_LOOPBACK) { 340 pr_warn("siw: device %s error: no parent device\n", 341 netdev->name); 342 return NULL; 343 } 344 parent = &netdev->dev; 345 } 346 sdev = ib_alloc_device(siw_device, base_dev); 347 if (!sdev) 348 return NULL; 349 350 base_dev = &sdev->base_dev; 351 352 sdev->netdev = netdev; 353 354 if (netdev->type != ARPHRD_LOOPBACK) { 355 memcpy(&base_dev->node_guid, netdev->dev_addr, 6); 356 } else { 357 /* 358 * The loopback device does not have a HW address, 359 * but connection mangagement lib expects gid != 0 360 */ 361 size_t gidlen = min_t(size_t, strlen(base_dev->name), 6); 362 363 memcpy(&base_dev->node_guid, base_dev->name, gidlen); 364 } 365 base_dev->uverbs_cmd_mask = 366 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) | 367 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) | 368 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) | 369 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) | 370 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) | 371 (1ull << IB_USER_VERBS_CMD_REG_MR) | 372 (1ull << IB_USER_VERBS_CMD_DEREG_MR) | 373 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) | 374 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) | 375 (1ull << IB_USER_VERBS_CMD_POLL_CQ) | 376 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) | 377 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) | 378 (1ull << IB_USER_VERBS_CMD_CREATE_QP) | 379 (1ull << IB_USER_VERBS_CMD_QUERY_QP) | 380 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) | 381 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) | 382 (1ull << IB_USER_VERBS_CMD_POST_SEND) | 383 (1ull << IB_USER_VERBS_CMD_POST_RECV) | 384 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) | 385 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV) | 386 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) | 387 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) | 388 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ); 389 390 base_dev->node_type = RDMA_NODE_RNIC; 391 memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON, 392 sizeof(SIW_NODE_DESC_COMMON)); 393 394 /* 395 * Current model (one-to-one device association): 396 * One Softiwarp device per net_device or, equivalently, 397 * per physical port. 398 */ 399 base_dev->phys_port_cnt = 1; 400 base_dev->dev.parent = parent; 401 base_dev->dev.dma_ops = &dma_virt_ops; 402 base_dev->num_comp_vectors = num_possible_cpus(); 403 404 ib_set_device_ops(base_dev, &siw_device_ops); 405 rv = ib_device_set_netdev(base_dev, netdev, 1); 406 if (rv) 407 goto error; 408 409 memcpy(base_dev->iw_ifname, netdev->name, 410 sizeof(base_dev->iw_ifname)); 411 412 /* Disable TCP port mapping */ 413 base_dev->iw_driver_flags = IW_F_NO_PORT_MAP, 414 415 sdev->attrs.max_qp = SIW_MAX_QP; 416 sdev->attrs.max_qp_wr = SIW_MAX_QP_WR; 417 sdev->attrs.max_ord = SIW_MAX_ORD_QP; 418 sdev->attrs.max_ird = SIW_MAX_IRD_QP; 419 sdev->attrs.max_sge = SIW_MAX_SGE; 420 sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD; 421 sdev->attrs.max_cq = SIW_MAX_CQ; 422 sdev->attrs.max_cqe = SIW_MAX_CQE; 423 sdev->attrs.max_mr = SIW_MAX_MR; 424 sdev->attrs.max_pd = SIW_MAX_PD; 425 sdev->attrs.max_mw = SIW_MAX_MW; 426 sdev->attrs.max_fmr = SIW_MAX_FMR; 427 sdev->attrs.max_srq = SIW_MAX_SRQ; 428 sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR; 429 sdev->attrs.max_srq_sge = SIW_MAX_SGE; 430 431 xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1); 432 xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1); 433 434 INIT_LIST_HEAD(&sdev->cep_list); 435 INIT_LIST_HEAD(&sdev->qp_list); 436 437 atomic_set(&sdev->num_ctx, 0); 438 atomic_set(&sdev->num_srq, 0); 439 atomic_set(&sdev->num_qp, 0); 440 atomic_set(&sdev->num_cq, 0); 441 atomic_set(&sdev->num_mr, 0); 442 atomic_set(&sdev->num_pd, 0); 443 444 sdev->numa_node = dev_to_node(parent); 445 spin_lock_init(&sdev->lock); 446 447 return sdev; 448 error: 449 ib_dealloc_device(base_dev); 450 451 return NULL; 452 } 453 454 /* 455 * Network link becomes unavailable. Mark all 456 * affected QP's accordingly. 457 */ 458 static void siw_netdev_down(struct work_struct *work) 459 { 460 struct siw_device *sdev = 461 container_of(work, struct siw_device, netdev_down); 462 463 struct siw_qp_attrs qp_attrs; 464 struct list_head *pos, *tmp; 465 466 memset(&qp_attrs, 0, sizeof(qp_attrs)); 467 qp_attrs.state = SIW_QP_STATE_ERROR; 468 469 list_for_each_safe(pos, tmp, &sdev->qp_list) { 470 struct siw_qp *qp = list_entry(pos, struct siw_qp, devq); 471 472 down_write(&qp->state_lock); 473 WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE)); 474 up_write(&qp->state_lock); 475 } 476 ib_device_put(&sdev->base_dev); 477 } 478 479 static void siw_device_goes_down(struct siw_device *sdev) 480 { 481 if (ib_device_try_get(&sdev->base_dev)) { 482 INIT_WORK(&sdev->netdev_down, siw_netdev_down); 483 schedule_work(&sdev->netdev_down); 484 } 485 } 486 487 static int siw_netdev_event(struct notifier_block *nb, unsigned long event, 488 void *arg) 489 { 490 struct net_device *netdev = netdev_notifier_info_to_dev(arg); 491 struct ib_device *base_dev; 492 struct siw_device *sdev; 493 494 dev_dbg(&netdev->dev, "siw: event %lu\n", event); 495 496 if (dev_net(netdev) != &init_net) 497 return NOTIFY_OK; 498 499 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 500 if (!base_dev) 501 return NOTIFY_OK; 502 503 sdev = to_siw_dev(base_dev); 504 505 switch (event) { 506 case NETDEV_UP: 507 sdev->state = IB_PORT_ACTIVE; 508 siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE); 509 break; 510 511 case NETDEV_GOING_DOWN: 512 siw_device_goes_down(sdev); 513 break; 514 515 case NETDEV_DOWN: 516 sdev->state = IB_PORT_DOWN; 517 siw_port_event(sdev, 1, IB_EVENT_PORT_ERR); 518 break; 519 520 case NETDEV_REGISTER: 521 /* 522 * Device registration now handled only by 523 * rdma netlink commands. So it shall be impossible 524 * to end up here with a valid siw device. 525 */ 526 siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n"); 527 break; 528 529 case NETDEV_UNREGISTER: 530 ib_unregister_device_queued(&sdev->base_dev); 531 break; 532 533 case NETDEV_CHANGEADDR: 534 siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE); 535 break; 536 /* 537 * Todo: Below netdev events are currently not handled. 538 */ 539 case NETDEV_CHANGEMTU: 540 case NETDEV_CHANGE: 541 break; 542 543 default: 544 break; 545 } 546 ib_device_put(&sdev->base_dev); 547 548 return NOTIFY_OK; 549 } 550 551 static struct notifier_block siw_netdev_nb = { 552 .notifier_call = siw_netdev_event, 553 }; 554 555 static int siw_newlink(const char *basedev_name, struct net_device *netdev) 556 { 557 struct ib_device *base_dev; 558 struct siw_device *sdev = NULL; 559 int rv = -ENOMEM; 560 561 if (!siw_dev_qualified(netdev)) 562 return -EINVAL; 563 564 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 565 if (base_dev) { 566 ib_device_put(base_dev); 567 return -EEXIST; 568 } 569 sdev = siw_device_create(netdev); 570 if (sdev) { 571 dev_dbg(&netdev->dev, "siw: new device\n"); 572 573 if (netif_running(netdev) && netif_carrier_ok(netdev)) 574 sdev->state = IB_PORT_ACTIVE; 575 else 576 sdev->state = IB_PORT_DOWN; 577 578 rv = siw_device_register(sdev, basedev_name); 579 if (rv) 580 ib_dealloc_device(&sdev->base_dev); 581 } 582 return rv; 583 } 584 585 static struct rdma_link_ops siw_link_ops = { 586 .type = "siw", 587 .newlink = siw_newlink, 588 }; 589 590 /* 591 * siw_init_module - Initialize Softiwarp module and register with netdev 592 * subsystem. 593 */ 594 static __init int siw_init_module(void) 595 { 596 int rv; 597 int nr_cpu; 598 599 if (SENDPAGE_THRESH < SIW_MAX_INLINE) { 600 pr_info("siw: sendpage threshold too small: %u\n", 601 (int)SENDPAGE_THRESH); 602 rv = -EINVAL; 603 goto out_error; 604 } 605 rv = siw_init_cpulist(); 606 if (rv) 607 goto out_error; 608 609 rv = siw_cm_init(); 610 if (rv) 611 goto out_error; 612 613 if (!siw_create_tx_threads()) { 614 pr_info("siw: Could not start any TX thread\n"); 615 rv = -ENOMEM; 616 goto out_error; 617 } 618 /* 619 * Locate CRC32 algorithm. If unsuccessful, fail 620 * loading siw only, if CRC is required. 621 */ 622 siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0); 623 if (IS_ERR(siw_crypto_shash)) { 624 pr_info("siw: Loading CRC32c failed: %ld\n", 625 PTR_ERR(siw_crypto_shash)); 626 siw_crypto_shash = NULL; 627 if (mpa_crc_required) { 628 rv = -EOPNOTSUPP; 629 goto out_error; 630 } 631 } 632 rv = register_netdevice_notifier(&siw_netdev_nb); 633 if (rv) 634 goto out_error; 635 636 rdma_link_register(&siw_link_ops); 637 638 pr_info("SoftiWARP attached\n"); 639 return 0; 640 641 out_error: 642 for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) { 643 if (siw_tx_thread[nr_cpu]) { 644 siw_stop_tx_thread(nr_cpu); 645 siw_tx_thread[nr_cpu] = NULL; 646 } 647 } 648 if (siw_crypto_shash) 649 crypto_free_shash(siw_crypto_shash); 650 651 pr_info("SoftIWARP attach failed. Error: %d\n", rv); 652 653 siw_cm_exit(); 654 siw_destroy_cpulist(); 655 656 return rv; 657 } 658 659 static void __exit siw_exit_module(void) 660 { 661 int cpu; 662 663 for_each_possible_cpu(cpu) { 664 if (siw_tx_thread[cpu]) { 665 siw_stop_tx_thread(cpu); 666 siw_tx_thread[cpu] = NULL; 667 } 668 } 669 unregister_netdevice_notifier(&siw_netdev_nb); 670 rdma_link_unregister(&siw_link_ops); 671 ib_unregister_driver(RDMA_DRIVER_SIW); 672 673 siw_cm_exit(); 674 675 siw_destroy_cpulist(); 676 677 if (siw_crypto_shash) 678 crypto_free_shash(siw_crypto_shash); 679 680 pr_info("SoftiWARP detached\n"); 681 } 682 683 module_init(siw_init_module); 684 module_exit(siw_exit_module); 685 686 MODULE_ALIAS_RDMA_LINK("siw"); 687