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 smcr_port_err(smcibdev, port_idx + 1); 253 } else { 254 clear_bit(port_idx, smcibdev->ports_going_away); 255 smcr_port_add(smcibdev, port_idx + 1); 256 } 257 } 258 } 259 260 /* can be called in IRQ context */ 261 static void smc_ib_global_event_handler(struct ib_event_handler *handler, 262 struct ib_event *ibevent) 263 { 264 struct smc_ib_device *smcibdev; 265 bool schedule = false; 266 u8 port_idx; 267 268 smcibdev = container_of(handler, struct smc_ib_device, event_handler); 269 270 switch (ibevent->event) { 271 case IB_EVENT_DEVICE_FATAL: 272 /* terminate all ports on device */ 273 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 274 set_bit(port_idx, &smcibdev->port_event_mask); 275 if (!test_and_set_bit(port_idx, 276 smcibdev->ports_going_away)) 277 schedule = true; 278 } 279 if (schedule) 280 schedule_work(&smcibdev->port_event_work); 281 break; 282 case IB_EVENT_PORT_ACTIVE: 283 port_idx = ibevent->element.port_num - 1; 284 if (port_idx >= SMC_MAX_PORTS) 285 break; 286 set_bit(port_idx, &smcibdev->port_event_mask); 287 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) 288 schedule_work(&smcibdev->port_event_work); 289 break; 290 case IB_EVENT_PORT_ERR: 291 port_idx = ibevent->element.port_num - 1; 292 if (port_idx >= SMC_MAX_PORTS) 293 break; 294 set_bit(port_idx, &smcibdev->port_event_mask); 295 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 296 schedule_work(&smcibdev->port_event_work); 297 break; 298 case IB_EVENT_GID_CHANGE: 299 port_idx = ibevent->element.port_num - 1; 300 if (port_idx >= SMC_MAX_PORTS) 301 break; 302 set_bit(port_idx, &smcibdev->port_event_mask); 303 schedule_work(&smcibdev->port_event_work); 304 break; 305 default: 306 break; 307 } 308 } 309 310 void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 311 { 312 if (lnk->roce_pd) 313 ib_dealloc_pd(lnk->roce_pd); 314 lnk->roce_pd = NULL; 315 } 316 317 int smc_ib_create_protection_domain(struct smc_link *lnk) 318 { 319 int rc; 320 321 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 322 rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 323 if (IS_ERR(lnk->roce_pd)) 324 lnk->roce_pd = NULL; 325 return rc; 326 } 327 328 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 329 { 330 struct smc_link *lnk = (struct smc_link *)priv; 331 struct smc_ib_device *smcibdev = lnk->smcibdev; 332 u8 port_idx; 333 334 switch (ibevent->event) { 335 case IB_EVENT_QP_FATAL: 336 case IB_EVENT_QP_ACCESS_ERR: 337 port_idx = ibevent->element.qp->port - 1; 338 if (port_idx >= SMC_MAX_PORTS) 339 break; 340 set_bit(port_idx, &smcibdev->port_event_mask); 341 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 342 schedule_work(&smcibdev->port_event_work); 343 break; 344 default: 345 break; 346 } 347 } 348 349 void smc_ib_destroy_queue_pair(struct smc_link *lnk) 350 { 351 if (lnk->roce_qp) 352 ib_destroy_qp(lnk->roce_qp); 353 lnk->roce_qp = NULL; 354 } 355 356 /* create a queue pair within the protection domain for a link */ 357 int smc_ib_create_queue_pair(struct smc_link *lnk) 358 { 359 struct ib_qp_init_attr qp_attr = { 360 .event_handler = smc_ib_qp_event_handler, 361 .qp_context = lnk, 362 .send_cq = lnk->smcibdev->roce_cq_send, 363 .recv_cq = lnk->smcibdev->roce_cq_recv, 364 .srq = NULL, 365 .cap = { 366 /* include unsolicited rdma_writes as well, 367 * there are max. 2 RDMA_WRITE per 1 WR_SEND 368 */ 369 .max_send_wr = SMC_WR_BUF_CNT * 3, 370 .max_recv_wr = SMC_WR_BUF_CNT * 3, 371 .max_send_sge = SMC_IB_MAX_SEND_SGE, 372 .max_recv_sge = 1, 373 }, 374 .sq_sig_type = IB_SIGNAL_REQ_WR, 375 .qp_type = IB_QPT_RC, 376 }; 377 int rc; 378 379 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 380 rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 381 if (IS_ERR(lnk->roce_qp)) 382 lnk->roce_qp = NULL; 383 else 384 smc_wr_remember_qp_attr(lnk); 385 return rc; 386 } 387 388 void smc_ib_put_memory_region(struct ib_mr *mr) 389 { 390 ib_dereg_mr(mr); 391 } 392 393 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx) 394 { 395 unsigned int offset = 0; 396 int sg_num; 397 398 /* map the largest prefix of a dma mapped SG list */ 399 sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx], 400 buf_slot->sgt[link_idx].sgl, 401 buf_slot->sgt[link_idx].orig_nents, 402 &offset, PAGE_SIZE); 403 404 return sg_num; 405 } 406 407 /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 408 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 409 struct smc_buf_desc *buf_slot, u8 link_idx) 410 { 411 if (buf_slot->mr_rx[link_idx]) 412 return 0; /* already done */ 413 414 buf_slot->mr_rx[link_idx] = 415 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 416 if (IS_ERR(buf_slot->mr_rx[link_idx])) { 417 int rc; 418 419 rc = PTR_ERR(buf_slot->mr_rx[link_idx]); 420 buf_slot->mr_rx[link_idx] = NULL; 421 return rc; 422 } 423 424 if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1) 425 return -EINVAL; 426 427 return 0; 428 } 429 430 /* synchronize buffer usage for cpu access */ 431 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk, 432 struct smc_buf_desc *buf_slot, 433 enum dma_data_direction data_direction) 434 { 435 struct scatterlist *sg; 436 unsigned int i; 437 438 /* for now there is just one DMA address */ 439 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 440 buf_slot->sgt[lnk->link_idx].nents, i) { 441 if (!sg_dma_len(sg)) 442 break; 443 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev, 444 sg_dma_address(sg), 445 sg_dma_len(sg), 446 data_direction); 447 } 448 } 449 450 /* synchronize buffer usage for device access */ 451 void smc_ib_sync_sg_for_device(struct smc_link *lnk, 452 struct smc_buf_desc *buf_slot, 453 enum dma_data_direction data_direction) 454 { 455 struct scatterlist *sg; 456 unsigned int i; 457 458 /* for now there is just one DMA address */ 459 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 460 buf_slot->sgt[lnk->link_idx].nents, i) { 461 if (!sg_dma_len(sg)) 462 break; 463 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev, 464 sg_dma_address(sg), 465 sg_dma_len(sg), 466 data_direction); 467 } 468 } 469 470 /* Map a new TX or RX buffer SG-table to DMA */ 471 int smc_ib_buf_map_sg(struct smc_link *lnk, 472 struct smc_buf_desc *buf_slot, 473 enum dma_data_direction data_direction) 474 { 475 int mapped_nents; 476 477 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev, 478 buf_slot->sgt[lnk->link_idx].sgl, 479 buf_slot->sgt[lnk->link_idx].orig_nents, 480 data_direction); 481 if (!mapped_nents) 482 return -ENOMEM; 483 484 return mapped_nents; 485 } 486 487 void smc_ib_buf_unmap_sg(struct smc_link *lnk, 488 struct smc_buf_desc *buf_slot, 489 enum dma_data_direction data_direction) 490 { 491 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address) 492 return; /* already unmapped */ 493 494 ib_dma_unmap_sg(lnk->smcibdev->ibdev, 495 buf_slot->sgt[lnk->link_idx].sgl, 496 buf_slot->sgt[lnk->link_idx].orig_nents, 497 data_direction); 498 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0; 499 } 500 501 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 502 { 503 struct ib_cq_init_attr cqattr = { 504 .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 505 int cqe_size_order, smc_order; 506 long rc; 507 508 /* the calculated number of cq entries fits to mlx5 cq allocation */ 509 cqe_size_order = cache_line_size() == 128 ? 7 : 6; 510 smc_order = MAX_ORDER - cqe_size_order - 1; 511 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 512 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 513 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 514 smc_wr_tx_cq_handler, NULL, 515 smcibdev, &cqattr); 516 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 517 if (IS_ERR(smcibdev->roce_cq_send)) { 518 smcibdev->roce_cq_send = NULL; 519 return rc; 520 } 521 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 522 smc_wr_rx_cq_handler, NULL, 523 smcibdev, &cqattr); 524 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 525 if (IS_ERR(smcibdev->roce_cq_recv)) { 526 smcibdev->roce_cq_recv = NULL; 527 goto err; 528 } 529 smc_wr_add_dev(smcibdev); 530 smcibdev->initialized = 1; 531 return rc; 532 533 err: 534 ib_destroy_cq(smcibdev->roce_cq_send); 535 return rc; 536 } 537 538 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 539 { 540 if (!smcibdev->initialized) 541 return; 542 smcibdev->initialized = 0; 543 ib_destroy_cq(smcibdev->roce_cq_recv); 544 ib_destroy_cq(smcibdev->roce_cq_send); 545 smc_wr_remove_dev(smcibdev); 546 } 547 548 static struct ib_client smc_ib_client; 549 550 /* callback function for ib_register_client() */ 551 static int smc_ib_add_dev(struct ib_device *ibdev) 552 { 553 struct smc_ib_device *smcibdev; 554 u8 port_cnt; 555 int i; 556 557 if (ibdev->node_type != RDMA_NODE_IB_CA) 558 return -EOPNOTSUPP; 559 560 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 561 if (!smcibdev) 562 return -ENOMEM; 563 564 smcibdev->ibdev = ibdev; 565 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 566 atomic_set(&smcibdev->lnk_cnt, 0); 567 init_waitqueue_head(&smcibdev->lnks_deleted); 568 spin_lock(&smc_ib_devices.lock); 569 list_add_tail(&smcibdev->list, &smc_ib_devices.list); 570 spin_unlock(&smc_ib_devices.lock); 571 ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 572 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 573 smc_ib_global_event_handler); 574 ib_register_event_handler(&smcibdev->event_handler); 575 576 /* trigger reading of the port attributes */ 577 port_cnt = smcibdev->ibdev->phys_port_cnt; 578 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n", 579 smcibdev->ibdev->name, port_cnt); 580 for (i = 0; 581 i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 582 i++) { 583 set_bit(i, &smcibdev->port_event_mask); 584 /* determine pnetids of the port */ 585 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i, 586 smcibdev->pnetid[i])) 587 smc_pnetid_by_table_ib(smcibdev, i + 1); 588 pr_warn_ratelimited("smc: ib device %s port %d has pnetid " 589 "%.16s%s\n", 590 smcibdev->ibdev->name, i + 1, 591 smcibdev->pnetid[i], 592 smcibdev->pnetid_by_user[i] ? 593 " (user defined)" : 594 ""); 595 } 596 schedule_work(&smcibdev->port_event_work); 597 return 0; 598 } 599 600 /* callback function for ib_unregister_client() */ 601 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 602 { 603 struct smc_ib_device *smcibdev = client_data; 604 605 spin_lock(&smc_ib_devices.lock); 606 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 607 spin_unlock(&smc_ib_devices.lock); 608 pr_warn_ratelimited("smc: removing ib device %s\n", 609 smcibdev->ibdev->name); 610 smc_smcr_terminate_all(smcibdev); 611 smc_ib_cleanup_per_ibdev(smcibdev); 612 ib_unregister_event_handler(&smcibdev->event_handler); 613 cancel_work_sync(&smcibdev->port_event_work); 614 kfree(smcibdev); 615 } 616 617 static struct ib_client smc_ib_client = { 618 .name = "smc_ib", 619 .add = smc_ib_add_dev, 620 .remove = smc_ib_remove_dev, 621 }; 622 623 int __init smc_ib_register_client(void) 624 { 625 smc_ib_init_local_systemid(); 626 return ib_register_client(&smc_ib_client); 627 } 628 629 void smc_ib_unregister_client(void) 630 { 631 ib_unregister_client(&smc_ib_client); 632 } 633