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 <linux/mutex.h> 20 #include <rdma/ib_verbs.h> 21 #include <rdma/ib_cache.h> 22 23 #include "smc_pnet.h" 24 #include "smc_ib.h" 25 #include "smc_core.h" 26 #include "smc_wr.h" 27 #include "smc.h" 28 29 #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 30 31 #define SMC_QP_MIN_RNR_TIMER 5 32 #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 33 #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 34 #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 35 36 struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 37 .mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex), 38 .list = LIST_HEAD_INIT(smc_ib_devices.list), 39 }; 40 41 u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ 42 43 static int smc_ib_modify_qp_init(struct smc_link *lnk) 44 { 45 struct ib_qp_attr qp_attr; 46 47 memset(&qp_attr, 0, sizeof(qp_attr)); 48 qp_attr.qp_state = IB_QPS_INIT; 49 qp_attr.pkey_index = 0; 50 qp_attr.port_num = lnk->ibport; 51 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 52 | IB_ACCESS_REMOTE_WRITE; 53 return ib_modify_qp(lnk->roce_qp, &qp_attr, 54 IB_QP_STATE | IB_QP_PKEY_INDEX | 55 IB_QP_ACCESS_FLAGS | IB_QP_PORT); 56 } 57 58 static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 59 { 60 enum ib_qp_attr_mask qp_attr_mask = 61 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 62 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 63 struct ib_qp_attr qp_attr; 64 65 memset(&qp_attr, 0, sizeof(qp_attr)); 66 qp_attr.qp_state = IB_QPS_RTR; 67 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 68 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 69 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 70 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0); 71 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 72 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 73 sizeof(lnk->peer_mac)); 74 qp_attr.dest_qp_num = lnk->peer_qpn; 75 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 76 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 77 * requests 78 */ 79 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 80 81 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 82 } 83 84 int smc_ib_modify_qp_rts(struct smc_link *lnk) 85 { 86 struct ib_qp_attr qp_attr; 87 88 memset(&qp_attr, 0, sizeof(qp_attr)); 89 qp_attr.qp_state = IB_QPS_RTS; 90 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 91 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 92 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 93 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 94 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 95 * atomic ops allowed 96 */ 97 return ib_modify_qp(lnk->roce_qp, &qp_attr, 98 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 99 IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 100 IB_QP_MAX_QP_RD_ATOMIC); 101 } 102 103 int smc_ib_modify_qp_reset(struct smc_link *lnk) 104 { 105 struct ib_qp_attr qp_attr; 106 107 memset(&qp_attr, 0, sizeof(qp_attr)); 108 qp_attr.qp_state = IB_QPS_RESET; 109 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 110 } 111 112 int smc_ib_ready_link(struct smc_link *lnk) 113 { 114 struct smc_link_group *lgr = smc_get_lgr(lnk); 115 int rc = 0; 116 117 rc = smc_ib_modify_qp_init(lnk); 118 if (rc) 119 goto out; 120 121 rc = smc_ib_modify_qp_rtr(lnk); 122 if (rc) 123 goto out; 124 smc_wr_remember_qp_attr(lnk); 125 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 126 IB_CQ_SOLICITED_MASK); 127 if (rc) 128 goto out; 129 rc = smc_wr_rx_post_init(lnk); 130 if (rc) 131 goto out; 132 smc_wr_remember_qp_attr(lnk); 133 134 if (lgr->role == SMC_SERV) { 135 rc = smc_ib_modify_qp_rts(lnk); 136 if (rc) 137 goto out; 138 smc_wr_remember_qp_attr(lnk); 139 } 140 out: 141 return rc; 142 } 143 144 static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) 145 { 146 const struct ib_gid_attr *attr; 147 int rc; 148 149 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); 150 if (IS_ERR(attr)) 151 return -ENODEV; 152 153 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]); 154 rdma_put_gid_attr(attr); 155 return rc; 156 } 157 158 /* Create an identifier unique for this instance of SMC-R. 159 * The MAC-address of the first active registered IB device 160 * plus a random 2-byte number is used to create this identifier. 161 * This name is delivered to the peer during connection initialization. 162 */ 163 static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 164 u8 ibport) 165 { 166 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 167 sizeof(smcibdev->mac[ibport - 1])); 168 } 169 170 bool smc_ib_is_valid_local_systemid(void) 171 { 172 return !is_zero_ether_addr(&local_systemid[2]); 173 } 174 175 static void smc_ib_init_local_systemid(void) 176 { 177 get_random_bytes(&local_systemid[0], 2); 178 } 179 180 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 181 { 182 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 183 } 184 185 /* determine the gid for an ib-device port and vlan id */ 186 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 187 unsigned short vlan_id, u8 gid[], u8 *sgid_index) 188 { 189 const struct ib_gid_attr *attr; 190 const struct net_device *ndev; 191 int i; 192 193 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 194 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 195 if (IS_ERR(attr)) 196 continue; 197 198 rcu_read_lock(); 199 ndev = rdma_read_gid_attr_ndev_rcu(attr); 200 if (!IS_ERR(ndev) && 201 ((!vlan_id && !is_vlan_dev(attr->ndev)) || 202 (vlan_id && is_vlan_dev(attr->ndev) && 203 vlan_dev_vlan_id(attr->ndev) == vlan_id)) && 204 attr->gid_type == IB_GID_TYPE_ROCE) { 205 rcu_read_unlock(); 206 if (gid) 207 memcpy(gid, &attr->gid, SMC_GID_SIZE); 208 if (sgid_index) 209 *sgid_index = attr->index; 210 rdma_put_gid_attr(attr); 211 return 0; 212 } 213 rcu_read_unlock(); 214 rdma_put_gid_attr(attr); 215 } 216 return -ENODEV; 217 } 218 219 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 220 { 221 int rc; 222 223 memset(&smcibdev->pattr[ibport - 1], 0, 224 sizeof(smcibdev->pattr[ibport - 1])); 225 rc = ib_query_port(smcibdev->ibdev, ibport, 226 &smcibdev->pattr[ibport - 1]); 227 if (rc) 228 goto out; 229 /* the SMC protocol requires specification of the RoCE MAC address */ 230 rc = smc_ib_fill_mac(smcibdev, ibport); 231 if (rc) 232 goto out; 233 if (!smc_ib_is_valid_local_systemid() && 234 smc_ib_port_active(smcibdev, ibport)) 235 /* create unique system identifier */ 236 smc_ib_define_local_systemid(smcibdev, ibport); 237 out: 238 return rc; 239 } 240 241 /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 242 static void smc_ib_port_event_work(struct work_struct *work) 243 { 244 struct smc_ib_device *smcibdev = container_of( 245 work, struct smc_ib_device, port_event_work); 246 u8 port_idx; 247 248 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 249 smc_ib_remember_port_attr(smcibdev, port_idx + 1); 250 clear_bit(port_idx, &smcibdev->port_event_mask); 251 if (!smc_ib_port_active(smcibdev, port_idx + 1)) { 252 set_bit(port_idx, smcibdev->ports_going_away); 253 smcr_port_err(smcibdev, port_idx + 1); 254 } else { 255 clear_bit(port_idx, smcibdev->ports_going_away); 256 smcr_port_add(smcibdev, port_idx + 1); 257 } 258 } 259 } 260 261 /* can be called in IRQ context */ 262 static void smc_ib_global_event_handler(struct ib_event_handler *handler, 263 struct ib_event *ibevent) 264 { 265 struct smc_ib_device *smcibdev; 266 bool schedule = false; 267 u8 port_idx; 268 269 smcibdev = container_of(handler, struct smc_ib_device, event_handler); 270 271 switch (ibevent->event) { 272 case IB_EVENT_DEVICE_FATAL: 273 /* terminate all ports on device */ 274 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 275 set_bit(port_idx, &smcibdev->port_event_mask); 276 if (!test_and_set_bit(port_idx, 277 smcibdev->ports_going_away)) 278 schedule = true; 279 } 280 if (schedule) 281 schedule_work(&smcibdev->port_event_work); 282 break; 283 case IB_EVENT_PORT_ACTIVE: 284 port_idx = ibevent->element.port_num - 1; 285 if (port_idx >= SMC_MAX_PORTS) 286 break; 287 set_bit(port_idx, &smcibdev->port_event_mask); 288 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) 289 schedule_work(&smcibdev->port_event_work); 290 break; 291 case IB_EVENT_PORT_ERR: 292 port_idx = ibevent->element.port_num - 1; 293 if (port_idx >= SMC_MAX_PORTS) 294 break; 295 set_bit(port_idx, &smcibdev->port_event_mask); 296 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 297 schedule_work(&smcibdev->port_event_work); 298 break; 299 case IB_EVENT_GID_CHANGE: 300 port_idx = ibevent->element.port_num - 1; 301 if (port_idx >= SMC_MAX_PORTS) 302 break; 303 set_bit(port_idx, &smcibdev->port_event_mask); 304 schedule_work(&smcibdev->port_event_work); 305 break; 306 default: 307 break; 308 } 309 } 310 311 void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 312 { 313 if (lnk->roce_pd) 314 ib_dealloc_pd(lnk->roce_pd); 315 lnk->roce_pd = NULL; 316 } 317 318 int smc_ib_create_protection_domain(struct smc_link *lnk) 319 { 320 int rc; 321 322 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 323 rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 324 if (IS_ERR(lnk->roce_pd)) 325 lnk->roce_pd = NULL; 326 return rc; 327 } 328 329 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 330 { 331 struct smc_link *lnk = (struct smc_link *)priv; 332 struct smc_ib_device *smcibdev = lnk->smcibdev; 333 u8 port_idx; 334 335 switch (ibevent->event) { 336 case IB_EVENT_QP_FATAL: 337 case IB_EVENT_QP_ACCESS_ERR: 338 port_idx = ibevent->element.qp->port - 1; 339 if (port_idx >= SMC_MAX_PORTS) 340 break; 341 set_bit(port_idx, &smcibdev->port_event_mask); 342 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 343 schedule_work(&smcibdev->port_event_work); 344 break; 345 default: 346 break; 347 } 348 } 349 350 void smc_ib_destroy_queue_pair(struct smc_link *lnk) 351 { 352 if (lnk->roce_qp) 353 ib_destroy_qp(lnk->roce_qp); 354 lnk->roce_qp = NULL; 355 } 356 357 /* create a queue pair within the protection domain for a link */ 358 int smc_ib_create_queue_pair(struct smc_link *lnk) 359 { 360 struct ib_qp_init_attr qp_attr = { 361 .event_handler = smc_ib_qp_event_handler, 362 .qp_context = lnk, 363 .send_cq = lnk->smcibdev->roce_cq_send, 364 .recv_cq = lnk->smcibdev->roce_cq_recv, 365 .srq = NULL, 366 .cap = { 367 /* include unsolicited rdma_writes as well, 368 * there are max. 2 RDMA_WRITE per 1 WR_SEND 369 */ 370 .max_send_wr = SMC_WR_BUF_CNT * 3, 371 .max_recv_wr = SMC_WR_BUF_CNT * 3, 372 .max_send_sge = SMC_IB_MAX_SEND_SGE, 373 .max_recv_sge = 1, 374 }, 375 .sq_sig_type = IB_SIGNAL_REQ_WR, 376 .qp_type = IB_QPT_RC, 377 }; 378 int rc; 379 380 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 381 rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 382 if (IS_ERR(lnk->roce_qp)) 383 lnk->roce_qp = NULL; 384 else 385 smc_wr_remember_qp_attr(lnk); 386 return rc; 387 } 388 389 void smc_ib_put_memory_region(struct ib_mr *mr) 390 { 391 ib_dereg_mr(mr); 392 } 393 394 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx) 395 { 396 unsigned int offset = 0; 397 int sg_num; 398 399 /* map the largest prefix of a dma mapped SG list */ 400 sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx], 401 buf_slot->sgt[link_idx].sgl, 402 buf_slot->sgt[link_idx].orig_nents, 403 &offset, PAGE_SIZE); 404 405 return sg_num; 406 } 407 408 /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 409 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 410 struct smc_buf_desc *buf_slot, u8 link_idx) 411 { 412 if (buf_slot->mr_rx[link_idx]) 413 return 0; /* already done */ 414 415 buf_slot->mr_rx[link_idx] = 416 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 417 if (IS_ERR(buf_slot->mr_rx[link_idx])) { 418 int rc; 419 420 rc = PTR_ERR(buf_slot->mr_rx[link_idx]); 421 buf_slot->mr_rx[link_idx] = NULL; 422 return rc; 423 } 424 425 if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1) 426 return -EINVAL; 427 428 return 0; 429 } 430 431 /* synchronize buffer usage for cpu access */ 432 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk, 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[lnk->link_idx].sgl, sg, 441 buf_slot->sgt[lnk->link_idx].nents, i) { 442 if (!sg_dma_len(sg)) 443 break; 444 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev, 445 sg_dma_address(sg), 446 sg_dma_len(sg), 447 data_direction); 448 } 449 } 450 451 /* synchronize buffer usage for device access */ 452 void smc_ib_sync_sg_for_device(struct smc_link *lnk, 453 struct smc_buf_desc *buf_slot, 454 enum dma_data_direction data_direction) 455 { 456 struct scatterlist *sg; 457 unsigned int i; 458 459 /* for now there is just one DMA address */ 460 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 461 buf_slot->sgt[lnk->link_idx].nents, i) { 462 if (!sg_dma_len(sg)) 463 break; 464 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev, 465 sg_dma_address(sg), 466 sg_dma_len(sg), 467 data_direction); 468 } 469 } 470 471 /* Map a new TX or RX buffer SG-table to DMA */ 472 int smc_ib_buf_map_sg(struct smc_link *lnk, 473 struct smc_buf_desc *buf_slot, 474 enum dma_data_direction data_direction) 475 { 476 int mapped_nents; 477 478 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev, 479 buf_slot->sgt[lnk->link_idx].sgl, 480 buf_slot->sgt[lnk->link_idx].orig_nents, 481 data_direction); 482 if (!mapped_nents) 483 return -ENOMEM; 484 485 return mapped_nents; 486 } 487 488 void smc_ib_buf_unmap_sg(struct smc_link *lnk, 489 struct smc_buf_desc *buf_slot, 490 enum dma_data_direction data_direction) 491 { 492 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address) 493 return; /* already unmapped */ 494 495 ib_dma_unmap_sg(lnk->smcibdev->ibdev, 496 buf_slot->sgt[lnk->link_idx].sgl, 497 buf_slot->sgt[lnk->link_idx].orig_nents, 498 data_direction); 499 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0; 500 } 501 502 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 503 { 504 struct ib_cq_init_attr cqattr = { 505 .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 506 int cqe_size_order, smc_order; 507 long rc; 508 509 mutex_lock(&smcibdev->mutex); 510 rc = 0; 511 if (smcibdev->initialized) 512 goto out; 513 /* the calculated number of cq entries fits to mlx5 cq allocation */ 514 cqe_size_order = cache_line_size() == 128 ? 7 : 6; 515 smc_order = MAX_ORDER - cqe_size_order - 1; 516 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 517 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 518 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 519 smc_wr_tx_cq_handler, NULL, 520 smcibdev, &cqattr); 521 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 522 if (IS_ERR(smcibdev->roce_cq_send)) { 523 smcibdev->roce_cq_send = NULL; 524 goto out; 525 } 526 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 527 smc_wr_rx_cq_handler, NULL, 528 smcibdev, &cqattr); 529 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 530 if (IS_ERR(smcibdev->roce_cq_recv)) { 531 smcibdev->roce_cq_recv = NULL; 532 goto err; 533 } 534 smc_wr_add_dev(smcibdev); 535 smcibdev->initialized = 1; 536 goto out; 537 538 err: 539 ib_destroy_cq(smcibdev->roce_cq_send); 540 out: 541 mutex_unlock(&smcibdev->mutex); 542 return rc; 543 } 544 545 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 546 { 547 mutex_lock(&smcibdev->mutex); 548 if (!smcibdev->initialized) 549 goto out; 550 smcibdev->initialized = 0; 551 ib_destroy_cq(smcibdev->roce_cq_recv); 552 ib_destroy_cq(smcibdev->roce_cq_send); 553 smc_wr_remove_dev(smcibdev); 554 out: 555 mutex_unlock(&smcibdev->mutex); 556 } 557 558 static struct ib_client smc_ib_client; 559 560 /* callback function for ib_register_client() */ 561 static int smc_ib_add_dev(struct ib_device *ibdev) 562 { 563 struct smc_ib_device *smcibdev; 564 u8 port_cnt; 565 int i; 566 567 if (ibdev->node_type != RDMA_NODE_IB_CA) 568 return -EOPNOTSUPP; 569 570 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 571 if (!smcibdev) 572 return -ENOMEM; 573 574 smcibdev->ibdev = ibdev; 575 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 576 atomic_set(&smcibdev->lnk_cnt, 0); 577 init_waitqueue_head(&smcibdev->lnks_deleted); 578 mutex_init(&smcibdev->mutex); 579 mutex_lock(&smc_ib_devices.mutex); 580 list_add_tail(&smcibdev->list, &smc_ib_devices.list); 581 mutex_unlock(&smc_ib_devices.mutex); 582 ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 583 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 584 smc_ib_global_event_handler); 585 ib_register_event_handler(&smcibdev->event_handler); 586 587 /* trigger reading of the port attributes */ 588 port_cnt = smcibdev->ibdev->phys_port_cnt; 589 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n", 590 smcibdev->ibdev->name, port_cnt); 591 for (i = 0; 592 i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 593 i++) { 594 set_bit(i, &smcibdev->port_event_mask); 595 /* determine pnetids of the port */ 596 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i, 597 smcibdev->pnetid[i])) 598 smc_pnetid_by_table_ib(smcibdev, i + 1); 599 pr_warn_ratelimited("smc: ib device %s port %d has pnetid " 600 "%.16s%s\n", 601 smcibdev->ibdev->name, i + 1, 602 smcibdev->pnetid[i], 603 smcibdev->pnetid_by_user[i] ? 604 " (user defined)" : 605 ""); 606 } 607 schedule_work(&smcibdev->port_event_work); 608 return 0; 609 } 610 611 /* callback function for ib_unregister_client() */ 612 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 613 { 614 struct smc_ib_device *smcibdev = client_data; 615 616 mutex_lock(&smc_ib_devices.mutex); 617 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 618 mutex_unlock(&smc_ib_devices.mutex); 619 pr_warn_ratelimited("smc: removing ib device %s\n", 620 smcibdev->ibdev->name); 621 smc_smcr_terminate_all(smcibdev); 622 smc_ib_cleanup_per_ibdev(smcibdev); 623 ib_unregister_event_handler(&smcibdev->event_handler); 624 cancel_work_sync(&smcibdev->port_event_work); 625 kfree(smcibdev); 626 } 627 628 static struct ib_client smc_ib_client = { 629 .name = "smc_ib", 630 .add = smc_ib_add_dev, 631 .remove = smc_ib_remove_dev, 632 }; 633 634 int __init smc_ib_register_client(void) 635 { 636 smc_ib_init_local_systemid(); 637 return ib_register_client(&smc_ib_client); 638 } 639 640 void smc_ib_unregister_client(void) 641 { 642 ib_unregister_client(&smc_ib_client); 643 } 644