1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * IB infrastructure: 6 * Establish SMC-R as an Infiniband Client to be notified about added and 7 * removed IB devices of type RDMA. 8 * Determine device and port characteristics for these IB devices. 9 * 10 * Copyright IBM Corp. 2016 11 * 12 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 13 */ 14 15 #include <linux/random.h> 16 #include <linux/workqueue.h> 17 #include <linux/scatterlist.h> 18 #include <linux/wait.h> 19 #include <rdma/ib_verbs.h> 20 #include <rdma/ib_cache.h> 21 22 #include "smc_pnet.h" 23 #include "smc_ib.h" 24 #include "smc_core.h" 25 #include "smc_wr.h" 26 #include "smc.h" 27 28 #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 29 30 #define SMC_QP_MIN_RNR_TIMER 5 31 #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 32 #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 33 #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 34 35 struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 36 .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), 37 .list = LIST_HEAD_INIT(smc_ib_devices.list), 38 }; 39 40 u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ 41 42 static int smc_ib_modify_qp_init(struct smc_link *lnk) 43 { 44 struct ib_qp_attr qp_attr; 45 46 memset(&qp_attr, 0, sizeof(qp_attr)); 47 qp_attr.qp_state = IB_QPS_INIT; 48 qp_attr.pkey_index = 0; 49 qp_attr.port_num = lnk->ibport; 50 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 51 | IB_ACCESS_REMOTE_WRITE; 52 return ib_modify_qp(lnk->roce_qp, &qp_attr, 53 IB_QP_STATE | IB_QP_PKEY_INDEX | 54 IB_QP_ACCESS_FLAGS | IB_QP_PORT); 55 } 56 57 static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 58 { 59 enum ib_qp_attr_mask qp_attr_mask = 60 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 61 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 62 struct ib_qp_attr qp_attr; 63 64 memset(&qp_attr, 0, sizeof(qp_attr)); 65 qp_attr.qp_state = IB_QPS_RTR; 66 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 67 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 68 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 69 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0); 70 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 71 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 72 sizeof(lnk->peer_mac)); 73 qp_attr.dest_qp_num = lnk->peer_qpn; 74 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 75 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 76 * requests 77 */ 78 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 79 80 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 81 } 82 83 int smc_ib_modify_qp_rts(struct smc_link *lnk) 84 { 85 struct ib_qp_attr qp_attr; 86 87 memset(&qp_attr, 0, sizeof(qp_attr)); 88 qp_attr.qp_state = IB_QPS_RTS; 89 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 90 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 91 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 92 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 93 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 94 * atomic ops allowed 95 */ 96 return ib_modify_qp(lnk->roce_qp, &qp_attr, 97 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 98 IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 99 IB_QP_MAX_QP_RD_ATOMIC); 100 } 101 102 int smc_ib_modify_qp_reset(struct smc_link *lnk) 103 { 104 struct ib_qp_attr qp_attr; 105 106 memset(&qp_attr, 0, sizeof(qp_attr)); 107 qp_attr.qp_state = IB_QPS_RESET; 108 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 109 } 110 111 int smc_ib_ready_link(struct smc_link *lnk) 112 { 113 struct smc_link_group *lgr = smc_get_lgr(lnk); 114 int rc = 0; 115 116 rc = smc_ib_modify_qp_init(lnk); 117 if (rc) 118 goto out; 119 120 rc = smc_ib_modify_qp_rtr(lnk); 121 if (rc) 122 goto out; 123 smc_wr_remember_qp_attr(lnk); 124 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 125 IB_CQ_SOLICITED_MASK); 126 if (rc) 127 goto out; 128 rc = smc_wr_rx_post_init(lnk); 129 if (rc) 130 goto out; 131 smc_wr_remember_qp_attr(lnk); 132 133 if (lgr->role == SMC_SERV) { 134 rc = smc_ib_modify_qp_rts(lnk); 135 if (rc) 136 goto out; 137 smc_wr_remember_qp_attr(lnk); 138 } 139 out: 140 return rc; 141 } 142 143 static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) 144 { 145 const struct ib_gid_attr *attr; 146 int rc; 147 148 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); 149 if (IS_ERR(attr)) 150 return -ENODEV; 151 152 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]); 153 rdma_put_gid_attr(attr); 154 return rc; 155 } 156 157 /* Create an identifier unique for this instance of SMC-R. 158 * The MAC-address of the first active registered IB device 159 * plus a random 2-byte number is used to create this identifier. 160 * This name is delivered to the peer during connection initialization. 161 */ 162 static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 163 u8 ibport) 164 { 165 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 166 sizeof(smcibdev->mac[ibport - 1])); 167 } 168 169 bool smc_ib_is_valid_local_systemid(void) 170 { 171 return !is_zero_ether_addr(&local_systemid[2]); 172 } 173 174 static void smc_ib_init_local_systemid(void) 175 { 176 get_random_bytes(&local_systemid[0], 2); 177 } 178 179 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 180 { 181 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 182 } 183 184 /* determine the gid for an ib-device port and vlan id */ 185 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 186 unsigned short vlan_id, u8 gid[], u8 *sgid_index) 187 { 188 const struct ib_gid_attr *attr; 189 const struct net_device *ndev; 190 int i; 191 192 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 193 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 194 if (IS_ERR(attr)) 195 continue; 196 197 rcu_read_lock(); 198 ndev = rdma_read_gid_attr_ndev_rcu(attr); 199 if (!IS_ERR(ndev) && 200 ((!vlan_id && !is_vlan_dev(attr->ndev)) || 201 (vlan_id && is_vlan_dev(attr->ndev) && 202 vlan_dev_vlan_id(attr->ndev) == vlan_id)) && 203 attr->gid_type == IB_GID_TYPE_ROCE) { 204 rcu_read_unlock(); 205 if (gid) 206 memcpy(gid, &attr->gid, SMC_GID_SIZE); 207 if (sgid_index) 208 *sgid_index = attr->index; 209 rdma_put_gid_attr(attr); 210 return 0; 211 } 212 rcu_read_unlock(); 213 rdma_put_gid_attr(attr); 214 } 215 return -ENODEV; 216 } 217 218 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 219 { 220 int rc; 221 222 memset(&smcibdev->pattr[ibport - 1], 0, 223 sizeof(smcibdev->pattr[ibport - 1])); 224 rc = ib_query_port(smcibdev->ibdev, ibport, 225 &smcibdev->pattr[ibport - 1]); 226 if (rc) 227 goto out; 228 /* the SMC protocol requires specification of the RoCE MAC address */ 229 rc = smc_ib_fill_mac(smcibdev, ibport); 230 if (rc) 231 goto out; 232 if (!smc_ib_is_valid_local_systemid() && 233 smc_ib_port_active(smcibdev, ibport)) 234 /* create unique system identifier */ 235 smc_ib_define_local_systemid(smcibdev, ibport); 236 out: 237 return rc; 238 } 239 240 /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 241 static void smc_ib_port_event_work(struct work_struct *work) 242 { 243 struct smc_ib_device *smcibdev = container_of( 244 work, struct smc_ib_device, port_event_work); 245 u8 port_idx; 246 247 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 248 smc_ib_remember_port_attr(smcibdev, port_idx + 1); 249 clear_bit(port_idx, &smcibdev->port_event_mask); 250 if (!smc_ib_port_active(smcibdev, port_idx + 1)) { 251 set_bit(port_idx, smcibdev->ports_going_away); 252 smc_port_terminate(smcibdev, port_idx + 1); 253 } else { 254 clear_bit(port_idx, smcibdev->ports_going_away); 255 } 256 } 257 } 258 259 /* can be called in IRQ context */ 260 static void smc_ib_global_event_handler(struct ib_event_handler *handler, 261 struct ib_event *ibevent) 262 { 263 struct smc_ib_device *smcibdev; 264 bool schedule = false; 265 u8 port_idx; 266 267 smcibdev = container_of(handler, struct smc_ib_device, event_handler); 268 269 switch (ibevent->event) { 270 case IB_EVENT_DEVICE_FATAL: 271 /* terminate all ports on device */ 272 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 273 set_bit(port_idx, &smcibdev->port_event_mask); 274 if (!test_and_set_bit(port_idx, 275 smcibdev->ports_going_away)) 276 schedule = true; 277 } 278 if (schedule) 279 schedule_work(&smcibdev->port_event_work); 280 break; 281 case IB_EVENT_PORT_ACTIVE: 282 port_idx = ibevent->element.port_num - 1; 283 if (port_idx >= SMC_MAX_PORTS) 284 break; 285 set_bit(port_idx, &smcibdev->port_event_mask); 286 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) 287 schedule_work(&smcibdev->port_event_work); 288 break; 289 case IB_EVENT_PORT_ERR: 290 port_idx = ibevent->element.port_num - 1; 291 if (port_idx >= SMC_MAX_PORTS) 292 break; 293 set_bit(port_idx, &smcibdev->port_event_mask); 294 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 295 schedule_work(&smcibdev->port_event_work); 296 break; 297 case IB_EVENT_GID_CHANGE: 298 port_idx = ibevent->element.port_num - 1; 299 if (port_idx >= SMC_MAX_PORTS) 300 break; 301 set_bit(port_idx, &smcibdev->port_event_mask); 302 schedule_work(&smcibdev->port_event_work); 303 break; 304 default: 305 break; 306 } 307 } 308 309 void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 310 { 311 if (lnk->roce_pd) 312 ib_dealloc_pd(lnk->roce_pd); 313 lnk->roce_pd = NULL; 314 } 315 316 int smc_ib_create_protection_domain(struct smc_link *lnk) 317 { 318 int rc; 319 320 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 321 rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 322 if (IS_ERR(lnk->roce_pd)) 323 lnk->roce_pd = NULL; 324 return rc; 325 } 326 327 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 328 { 329 struct smc_link *lnk = (struct smc_link *)priv; 330 struct smc_ib_device *smcibdev = lnk->smcibdev; 331 u8 port_idx; 332 333 switch (ibevent->event) { 334 case IB_EVENT_QP_FATAL: 335 case IB_EVENT_QP_ACCESS_ERR: 336 port_idx = ibevent->element.qp->port - 1; 337 if (port_idx >= SMC_MAX_PORTS) 338 break; 339 set_bit(port_idx, &smcibdev->port_event_mask); 340 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 341 schedule_work(&smcibdev->port_event_work); 342 break; 343 default: 344 break; 345 } 346 } 347 348 void smc_ib_destroy_queue_pair(struct smc_link *lnk) 349 { 350 if (lnk->roce_qp) 351 ib_destroy_qp(lnk->roce_qp); 352 lnk->roce_qp = NULL; 353 } 354 355 /* create a queue pair within the protection domain for a link */ 356 int smc_ib_create_queue_pair(struct smc_link *lnk) 357 { 358 struct ib_qp_init_attr qp_attr = { 359 .event_handler = smc_ib_qp_event_handler, 360 .qp_context = lnk, 361 .send_cq = lnk->smcibdev->roce_cq_send, 362 .recv_cq = lnk->smcibdev->roce_cq_recv, 363 .srq = NULL, 364 .cap = { 365 /* include unsolicited rdma_writes as well, 366 * there are max. 2 RDMA_WRITE per 1 WR_SEND 367 */ 368 .max_send_wr = SMC_WR_BUF_CNT * 3, 369 .max_recv_wr = SMC_WR_BUF_CNT * 3, 370 .max_send_sge = SMC_IB_MAX_SEND_SGE, 371 .max_recv_sge = 1, 372 }, 373 .sq_sig_type = IB_SIGNAL_REQ_WR, 374 .qp_type = IB_QPT_RC, 375 }; 376 int rc; 377 378 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 379 rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 380 if (IS_ERR(lnk->roce_qp)) 381 lnk->roce_qp = NULL; 382 else 383 smc_wr_remember_qp_attr(lnk); 384 return rc; 385 } 386 387 void smc_ib_put_memory_region(struct ib_mr *mr) 388 { 389 ib_dereg_mr(mr); 390 } 391 392 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot) 393 { 394 unsigned int offset = 0; 395 int sg_num; 396 397 /* map the largest prefix of a dma mapped SG list */ 398 sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK], 399 buf_slot->sgt[SMC_SINGLE_LINK].sgl, 400 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 401 &offset, PAGE_SIZE); 402 403 return sg_num; 404 } 405 406 /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 407 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 408 struct smc_buf_desc *buf_slot) 409 { 410 if (buf_slot->mr_rx[SMC_SINGLE_LINK]) 411 return 0; /* already done */ 412 413 buf_slot->mr_rx[SMC_SINGLE_LINK] = 414 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 415 if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) { 416 int rc; 417 418 rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]); 419 buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL; 420 return rc; 421 } 422 423 if (smc_ib_map_mr_sg(buf_slot) != 1) 424 return -EINVAL; 425 426 return 0; 427 } 428 429 /* synchronize buffer usage for cpu access */ 430 void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev, 431 struct smc_buf_desc *buf_slot, 432 enum dma_data_direction data_direction) 433 { 434 struct scatterlist *sg; 435 unsigned int i; 436 437 /* for now there is just one DMA address */ 438 for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 439 buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 440 if (!sg_dma_len(sg)) 441 break; 442 ib_dma_sync_single_for_cpu(smcibdev->ibdev, 443 sg_dma_address(sg), 444 sg_dma_len(sg), 445 data_direction); 446 } 447 } 448 449 /* synchronize buffer usage for device access */ 450 void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev, 451 struct smc_buf_desc *buf_slot, 452 enum dma_data_direction data_direction) 453 { 454 struct scatterlist *sg; 455 unsigned int i; 456 457 /* for now there is just one DMA address */ 458 for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg, 459 buf_slot->sgt[SMC_SINGLE_LINK].nents, i) { 460 if (!sg_dma_len(sg)) 461 break; 462 ib_dma_sync_single_for_device(smcibdev->ibdev, 463 sg_dma_address(sg), 464 sg_dma_len(sg), 465 data_direction); 466 } 467 } 468 469 /* Map a new TX or RX buffer SG-table to DMA */ 470 int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev, 471 struct smc_buf_desc *buf_slot, 472 enum dma_data_direction data_direction) 473 { 474 int mapped_nents; 475 476 mapped_nents = ib_dma_map_sg(smcibdev->ibdev, 477 buf_slot->sgt[SMC_SINGLE_LINK].sgl, 478 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 479 data_direction); 480 if (!mapped_nents) 481 return -ENOMEM; 482 483 return mapped_nents; 484 } 485 486 void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 487 struct smc_buf_desc *buf_slot, 488 enum dma_data_direction data_direction) 489 { 490 if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address) 491 return; /* already unmapped */ 492 493 ib_dma_unmap_sg(smcibdev->ibdev, 494 buf_slot->sgt[SMC_SINGLE_LINK].sgl, 495 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents, 496 data_direction); 497 buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0; 498 } 499 500 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 501 { 502 struct ib_cq_init_attr cqattr = { 503 .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 504 int cqe_size_order, smc_order; 505 long rc; 506 507 /* the calculated number of cq entries fits to mlx5 cq allocation */ 508 cqe_size_order = cache_line_size() == 128 ? 7 : 6; 509 smc_order = MAX_ORDER - cqe_size_order - 1; 510 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 511 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 512 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 513 smc_wr_tx_cq_handler, NULL, 514 smcibdev, &cqattr); 515 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 516 if (IS_ERR(smcibdev->roce_cq_send)) { 517 smcibdev->roce_cq_send = NULL; 518 return rc; 519 } 520 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 521 smc_wr_rx_cq_handler, NULL, 522 smcibdev, &cqattr); 523 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 524 if (IS_ERR(smcibdev->roce_cq_recv)) { 525 smcibdev->roce_cq_recv = NULL; 526 goto err; 527 } 528 smc_wr_add_dev(smcibdev); 529 smcibdev->initialized = 1; 530 return rc; 531 532 err: 533 ib_destroy_cq(smcibdev->roce_cq_send); 534 return rc; 535 } 536 537 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 538 { 539 if (!smcibdev->initialized) 540 return; 541 smcibdev->initialized = 0; 542 ib_destroy_cq(smcibdev->roce_cq_recv); 543 ib_destroy_cq(smcibdev->roce_cq_send); 544 smc_wr_remove_dev(smcibdev); 545 } 546 547 static struct ib_client smc_ib_client; 548 549 /* callback function for ib_register_client() */ 550 static void smc_ib_add_dev(struct ib_device *ibdev) 551 { 552 struct smc_ib_device *smcibdev; 553 u8 port_cnt; 554 int i; 555 556 if (ibdev->node_type != RDMA_NODE_IB_CA) 557 return; 558 559 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 560 if (!smcibdev) 561 return; 562 563 smcibdev->ibdev = ibdev; 564 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 565 atomic_set(&smcibdev->lnk_cnt, 0); 566 init_waitqueue_head(&smcibdev->lnks_deleted); 567 spin_lock(&smc_ib_devices.lock); 568 list_add_tail(&smcibdev->list, &smc_ib_devices.list); 569 spin_unlock(&smc_ib_devices.lock); 570 ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 571 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 572 smc_ib_global_event_handler); 573 ib_register_event_handler(&smcibdev->event_handler); 574 575 /* trigger reading of the port attributes */ 576 port_cnt = smcibdev->ibdev->phys_port_cnt; 577 for (i = 0; 578 i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 579 i++) { 580 set_bit(i, &smcibdev->port_event_mask); 581 /* determine pnetids of the port */ 582 smc_pnetid_by_dev_port(ibdev->dev.parent, i, 583 smcibdev->pnetid[i]); 584 } 585 schedule_work(&smcibdev->port_event_work); 586 } 587 588 /* callback function for ib_unregister_client() */ 589 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 590 { 591 struct smc_ib_device *smcibdev; 592 593 smcibdev = ib_get_client_data(ibdev, &smc_ib_client); 594 if (!smcibdev || smcibdev->ibdev != ibdev) 595 return; 596 ib_set_client_data(ibdev, &smc_ib_client, NULL); 597 spin_lock(&smc_ib_devices.lock); 598 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 599 spin_unlock(&smc_ib_devices.lock); 600 smc_smcr_terminate_all(smcibdev); 601 smc_ib_cleanup_per_ibdev(smcibdev); 602 ib_unregister_event_handler(&smcibdev->event_handler); 603 cancel_work_sync(&smcibdev->port_event_work); 604 kfree(smcibdev); 605 } 606 607 static struct ib_client smc_ib_client = { 608 .name = "smc_ib", 609 .add = smc_ib_add_dev, 610 .remove = smc_ib_remove_dev, 611 }; 612 613 int __init smc_ib_register_client(void) 614 { 615 smc_ib_init_local_systemid(); 616 return ib_register_client(&smc_ib_client); 617 } 618 619 void smc_ib_unregister_client(void) 620 { 621 ib_unregister_client(&smc_ib_client); 622 } 623