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