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