1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NVMe over Fabrics RDMA target. 4 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 5 */ 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 #include <linux/atomic.h> 8 #include <linux/ctype.h> 9 #include <linux/delay.h> 10 #include <linux/err.h> 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/nvme.h> 14 #include <linux/slab.h> 15 #include <linux/string.h> 16 #include <linux/wait.h> 17 #include <linux/inet.h> 18 #include <asm/unaligned.h> 19 20 #include <rdma/ib_verbs.h> 21 #include <rdma/rdma_cm.h> 22 #include <rdma/rw.h> 23 #include <rdma/ib_cm.h> 24 25 #include <linux/nvme-rdma.h> 26 #include "nvmet.h" 27 28 /* 29 * We allow at least 1 page, up to 4 SGEs, and up to 16KB of inline data 30 */ 31 #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE PAGE_SIZE 32 #define NVMET_RDMA_MAX_INLINE_SGE 4 33 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE max_t(int, SZ_16K, PAGE_SIZE) 34 35 /* Assume mpsmin == device_page_size == 4KB */ 36 #define NVMET_RDMA_MAX_MDTS 8 37 #define NVMET_RDMA_MAX_METADATA_MDTS 5 38 39 struct nvmet_rdma_srq; 40 41 struct nvmet_rdma_cmd { 42 struct ib_sge sge[NVMET_RDMA_MAX_INLINE_SGE + 1]; 43 struct ib_cqe cqe; 44 struct ib_recv_wr wr; 45 struct scatterlist inline_sg[NVMET_RDMA_MAX_INLINE_SGE]; 46 struct nvme_command *nvme_cmd; 47 struct nvmet_rdma_queue *queue; 48 struct nvmet_rdma_srq *nsrq; 49 }; 50 51 enum { 52 NVMET_RDMA_REQ_INLINE_DATA = (1 << 0), 53 NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1), 54 }; 55 56 struct nvmet_rdma_rsp { 57 struct ib_sge send_sge; 58 struct ib_cqe send_cqe; 59 struct ib_send_wr send_wr; 60 61 struct nvmet_rdma_cmd *cmd; 62 struct nvmet_rdma_queue *queue; 63 64 struct ib_cqe read_cqe; 65 struct ib_cqe write_cqe; 66 struct rdma_rw_ctx rw; 67 68 struct nvmet_req req; 69 70 bool allocated; 71 u8 n_rdma; 72 u32 flags; 73 u32 invalidate_rkey; 74 75 struct list_head wait_list; 76 struct list_head free_list; 77 }; 78 79 enum nvmet_rdma_queue_state { 80 NVMET_RDMA_Q_CONNECTING, 81 NVMET_RDMA_Q_LIVE, 82 NVMET_RDMA_Q_DISCONNECTING, 83 }; 84 85 struct nvmet_rdma_queue { 86 struct rdma_cm_id *cm_id; 87 struct ib_qp *qp; 88 struct nvmet_port *port; 89 struct ib_cq *cq; 90 atomic_t sq_wr_avail; 91 struct nvmet_rdma_device *dev; 92 struct nvmet_rdma_srq *nsrq; 93 spinlock_t state_lock; 94 enum nvmet_rdma_queue_state state; 95 struct nvmet_cq nvme_cq; 96 struct nvmet_sq nvme_sq; 97 98 struct nvmet_rdma_rsp *rsps; 99 struct list_head free_rsps; 100 spinlock_t rsps_lock; 101 struct nvmet_rdma_cmd *cmds; 102 103 struct work_struct release_work; 104 struct list_head rsp_wait_list; 105 struct list_head rsp_wr_wait_list; 106 spinlock_t rsp_wr_wait_lock; 107 108 int idx; 109 int host_qid; 110 int comp_vector; 111 int recv_queue_size; 112 int send_queue_size; 113 114 struct list_head queue_list; 115 }; 116 117 struct nvmet_rdma_port { 118 struct nvmet_port *nport; 119 struct sockaddr_storage addr; 120 struct rdma_cm_id *cm_id; 121 struct delayed_work repair_work; 122 }; 123 124 struct nvmet_rdma_srq { 125 struct ib_srq *srq; 126 struct nvmet_rdma_cmd *cmds; 127 struct nvmet_rdma_device *ndev; 128 }; 129 130 struct nvmet_rdma_device { 131 struct ib_device *device; 132 struct ib_pd *pd; 133 struct nvmet_rdma_srq **srqs; 134 int srq_count; 135 size_t srq_size; 136 struct kref ref; 137 struct list_head entry; 138 int inline_data_size; 139 int inline_page_count; 140 }; 141 142 static bool nvmet_rdma_use_srq; 143 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444); 144 MODULE_PARM_DESC(use_srq, "Use shared receive queue."); 145 146 static int srq_size_set(const char *val, const struct kernel_param *kp); 147 static const struct kernel_param_ops srq_size_ops = { 148 .set = srq_size_set, 149 .get = param_get_int, 150 }; 151 152 static int nvmet_rdma_srq_size = 1024; 153 module_param_cb(srq_size, &srq_size_ops, &nvmet_rdma_srq_size, 0644); 154 MODULE_PARM_DESC(srq_size, "set Shared Receive Queue (SRQ) size, should >= 256 (default: 1024)"); 155 156 static DEFINE_IDA(nvmet_rdma_queue_ida); 157 static LIST_HEAD(nvmet_rdma_queue_list); 158 static DEFINE_MUTEX(nvmet_rdma_queue_mutex); 159 160 static LIST_HEAD(device_list); 161 static DEFINE_MUTEX(device_list_mutex); 162 163 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp); 164 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc); 165 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); 166 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc); 167 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc); 168 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv); 169 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue); 170 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev, 171 struct nvmet_rdma_rsp *r); 172 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, 173 struct nvmet_rdma_rsp *r); 174 175 static const struct nvmet_fabrics_ops nvmet_rdma_ops; 176 177 static int srq_size_set(const char *val, const struct kernel_param *kp) 178 { 179 int n = 0, ret; 180 181 ret = kstrtoint(val, 10, &n); 182 if (ret != 0 || n < 256) 183 return -EINVAL; 184 185 return param_set_int(val, kp); 186 } 187 188 static int num_pages(int len) 189 { 190 return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT); 191 } 192 193 static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp) 194 { 195 return nvme_is_write(rsp->req.cmd) && 196 rsp->req.transfer_len && 197 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); 198 } 199 200 static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp) 201 { 202 return !nvme_is_write(rsp->req.cmd) && 203 rsp->req.transfer_len && 204 !rsp->req.cqe->status && 205 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); 206 } 207 208 static inline struct nvmet_rdma_rsp * 209 nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue) 210 { 211 struct nvmet_rdma_rsp *rsp; 212 unsigned long flags; 213 214 spin_lock_irqsave(&queue->rsps_lock, flags); 215 rsp = list_first_entry_or_null(&queue->free_rsps, 216 struct nvmet_rdma_rsp, free_list); 217 if (likely(rsp)) 218 list_del(&rsp->free_list); 219 spin_unlock_irqrestore(&queue->rsps_lock, flags); 220 221 if (unlikely(!rsp)) { 222 int ret; 223 224 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); 225 if (unlikely(!rsp)) 226 return NULL; 227 ret = nvmet_rdma_alloc_rsp(queue->dev, rsp); 228 if (unlikely(ret)) { 229 kfree(rsp); 230 return NULL; 231 } 232 233 rsp->allocated = true; 234 } 235 236 return rsp; 237 } 238 239 static inline void 240 nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp) 241 { 242 unsigned long flags; 243 244 if (unlikely(rsp->allocated)) { 245 nvmet_rdma_free_rsp(rsp->queue->dev, rsp); 246 kfree(rsp); 247 return; 248 } 249 250 spin_lock_irqsave(&rsp->queue->rsps_lock, flags); 251 list_add_tail(&rsp->free_list, &rsp->queue->free_rsps); 252 spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags); 253 } 254 255 static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev, 256 struct nvmet_rdma_cmd *c) 257 { 258 struct scatterlist *sg; 259 struct ib_sge *sge; 260 int i; 261 262 if (!ndev->inline_data_size) 263 return; 264 265 sg = c->inline_sg; 266 sge = &c->sge[1]; 267 268 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) { 269 if (sge->length) 270 ib_dma_unmap_page(ndev->device, sge->addr, 271 sge->length, DMA_FROM_DEVICE); 272 if (sg_page(sg)) 273 __free_page(sg_page(sg)); 274 } 275 } 276 277 static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev, 278 struct nvmet_rdma_cmd *c) 279 { 280 struct scatterlist *sg; 281 struct ib_sge *sge; 282 struct page *pg; 283 int len; 284 int i; 285 286 if (!ndev->inline_data_size) 287 return 0; 288 289 sg = c->inline_sg; 290 sg_init_table(sg, ndev->inline_page_count); 291 sge = &c->sge[1]; 292 len = ndev->inline_data_size; 293 294 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) { 295 pg = alloc_page(GFP_KERNEL); 296 if (!pg) 297 goto out_err; 298 sg_assign_page(sg, pg); 299 sge->addr = ib_dma_map_page(ndev->device, 300 pg, 0, PAGE_SIZE, DMA_FROM_DEVICE); 301 if (ib_dma_mapping_error(ndev->device, sge->addr)) 302 goto out_err; 303 sge->length = min_t(int, len, PAGE_SIZE); 304 sge->lkey = ndev->pd->local_dma_lkey; 305 len -= sge->length; 306 } 307 308 return 0; 309 out_err: 310 for (; i >= 0; i--, sg--, sge--) { 311 if (sge->length) 312 ib_dma_unmap_page(ndev->device, sge->addr, 313 sge->length, DMA_FROM_DEVICE); 314 if (sg_page(sg)) 315 __free_page(sg_page(sg)); 316 } 317 return -ENOMEM; 318 } 319 320 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev, 321 struct nvmet_rdma_cmd *c, bool admin) 322 { 323 /* NVMe command / RDMA RECV */ 324 c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL); 325 if (!c->nvme_cmd) 326 goto out; 327 328 c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd, 329 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); 330 if (ib_dma_mapping_error(ndev->device, c->sge[0].addr)) 331 goto out_free_cmd; 332 333 c->sge[0].length = sizeof(*c->nvme_cmd); 334 c->sge[0].lkey = ndev->pd->local_dma_lkey; 335 336 if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c)) 337 goto out_unmap_cmd; 338 339 c->cqe.done = nvmet_rdma_recv_done; 340 341 c->wr.wr_cqe = &c->cqe; 342 c->wr.sg_list = c->sge; 343 c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1; 344 345 return 0; 346 347 out_unmap_cmd: 348 ib_dma_unmap_single(ndev->device, c->sge[0].addr, 349 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); 350 out_free_cmd: 351 kfree(c->nvme_cmd); 352 353 out: 354 return -ENOMEM; 355 } 356 357 static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev, 358 struct nvmet_rdma_cmd *c, bool admin) 359 { 360 if (!admin) 361 nvmet_rdma_free_inline_pages(ndev, c); 362 ib_dma_unmap_single(ndev->device, c->sge[0].addr, 363 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE); 364 kfree(c->nvme_cmd); 365 } 366 367 static struct nvmet_rdma_cmd * 368 nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev, 369 int nr_cmds, bool admin) 370 { 371 struct nvmet_rdma_cmd *cmds; 372 int ret = -EINVAL, i; 373 374 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL); 375 if (!cmds) 376 goto out; 377 378 for (i = 0; i < nr_cmds; i++) { 379 ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin); 380 if (ret) 381 goto out_free; 382 } 383 384 return cmds; 385 386 out_free: 387 while (--i >= 0) 388 nvmet_rdma_free_cmd(ndev, cmds + i, admin); 389 kfree(cmds); 390 out: 391 return ERR_PTR(ret); 392 } 393 394 static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev, 395 struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin) 396 { 397 int i; 398 399 for (i = 0; i < nr_cmds; i++) 400 nvmet_rdma_free_cmd(ndev, cmds + i, admin); 401 kfree(cmds); 402 } 403 404 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, 405 struct nvmet_rdma_rsp *r) 406 { 407 /* NVMe CQE / RDMA SEND */ 408 r->req.cqe = kmalloc(sizeof(*r->req.cqe), GFP_KERNEL); 409 if (!r->req.cqe) 410 goto out; 411 412 r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.cqe, 413 sizeof(*r->req.cqe), DMA_TO_DEVICE); 414 if (ib_dma_mapping_error(ndev->device, r->send_sge.addr)) 415 goto out_free_rsp; 416 417 if (!ib_uses_virt_dma(ndev->device)) 418 r->req.p2p_client = &ndev->device->dev; 419 r->send_sge.length = sizeof(*r->req.cqe); 420 r->send_sge.lkey = ndev->pd->local_dma_lkey; 421 422 r->send_cqe.done = nvmet_rdma_send_done; 423 424 r->send_wr.wr_cqe = &r->send_cqe; 425 r->send_wr.sg_list = &r->send_sge; 426 r->send_wr.num_sge = 1; 427 r->send_wr.send_flags = IB_SEND_SIGNALED; 428 429 /* Data In / RDMA READ */ 430 r->read_cqe.done = nvmet_rdma_read_data_done; 431 /* Data Out / RDMA WRITE */ 432 r->write_cqe.done = nvmet_rdma_write_data_done; 433 434 return 0; 435 436 out_free_rsp: 437 kfree(r->req.cqe); 438 out: 439 return -ENOMEM; 440 } 441 442 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev, 443 struct nvmet_rdma_rsp *r) 444 { 445 ib_dma_unmap_single(ndev->device, r->send_sge.addr, 446 sizeof(*r->req.cqe), DMA_TO_DEVICE); 447 kfree(r->req.cqe); 448 } 449 450 static int 451 nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue) 452 { 453 struct nvmet_rdma_device *ndev = queue->dev; 454 int nr_rsps = queue->recv_queue_size * 2; 455 int ret = -EINVAL, i; 456 457 queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp), 458 GFP_KERNEL); 459 if (!queue->rsps) 460 goto out; 461 462 for (i = 0; i < nr_rsps; i++) { 463 struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; 464 465 ret = nvmet_rdma_alloc_rsp(ndev, rsp); 466 if (ret) 467 goto out_free; 468 469 list_add_tail(&rsp->free_list, &queue->free_rsps); 470 } 471 472 return 0; 473 474 out_free: 475 while (--i >= 0) { 476 struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; 477 478 list_del(&rsp->free_list); 479 nvmet_rdma_free_rsp(ndev, rsp); 480 } 481 kfree(queue->rsps); 482 out: 483 return ret; 484 } 485 486 static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue) 487 { 488 struct nvmet_rdma_device *ndev = queue->dev; 489 int i, nr_rsps = queue->recv_queue_size * 2; 490 491 for (i = 0; i < nr_rsps; i++) { 492 struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; 493 494 list_del(&rsp->free_list); 495 nvmet_rdma_free_rsp(ndev, rsp); 496 } 497 kfree(queue->rsps); 498 } 499 500 static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev, 501 struct nvmet_rdma_cmd *cmd) 502 { 503 int ret; 504 505 ib_dma_sync_single_for_device(ndev->device, 506 cmd->sge[0].addr, cmd->sge[0].length, 507 DMA_FROM_DEVICE); 508 509 if (cmd->nsrq) 510 ret = ib_post_srq_recv(cmd->nsrq->srq, &cmd->wr, NULL); 511 else 512 ret = ib_post_recv(cmd->queue->qp, &cmd->wr, NULL); 513 514 if (unlikely(ret)) 515 pr_err("post_recv cmd failed\n"); 516 517 return ret; 518 } 519 520 static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue) 521 { 522 spin_lock(&queue->rsp_wr_wait_lock); 523 while (!list_empty(&queue->rsp_wr_wait_list)) { 524 struct nvmet_rdma_rsp *rsp; 525 bool ret; 526 527 rsp = list_entry(queue->rsp_wr_wait_list.next, 528 struct nvmet_rdma_rsp, wait_list); 529 list_del(&rsp->wait_list); 530 531 spin_unlock(&queue->rsp_wr_wait_lock); 532 ret = nvmet_rdma_execute_command(rsp); 533 spin_lock(&queue->rsp_wr_wait_lock); 534 535 if (!ret) { 536 list_add(&rsp->wait_list, &queue->rsp_wr_wait_list); 537 break; 538 } 539 } 540 spin_unlock(&queue->rsp_wr_wait_lock); 541 } 542 543 static u16 nvmet_rdma_check_pi_status(struct ib_mr *sig_mr) 544 { 545 struct ib_mr_status mr_status; 546 int ret; 547 u16 status = 0; 548 549 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); 550 if (ret) { 551 pr_err("ib_check_mr_status failed, ret %d\n", ret); 552 return NVME_SC_INVALID_PI; 553 } 554 555 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 556 switch (mr_status.sig_err.err_type) { 557 case IB_SIG_BAD_GUARD: 558 status = NVME_SC_GUARD_CHECK; 559 break; 560 case IB_SIG_BAD_REFTAG: 561 status = NVME_SC_REFTAG_CHECK; 562 break; 563 case IB_SIG_BAD_APPTAG: 564 status = NVME_SC_APPTAG_CHECK; 565 break; 566 } 567 pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n", 568 mr_status.sig_err.err_type, 569 mr_status.sig_err.expected, 570 mr_status.sig_err.actual); 571 } 572 573 return status; 574 } 575 576 static void nvmet_rdma_set_sig_domain(struct blk_integrity *bi, 577 struct nvme_command *cmd, struct ib_sig_domain *domain, 578 u16 control, u8 pi_type) 579 { 580 domain->sig_type = IB_SIG_TYPE_T10_DIF; 581 domain->sig.dif.bg_type = IB_T10DIF_CRC; 582 domain->sig.dif.pi_interval = 1 << bi->interval_exp; 583 domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag); 584 if (control & NVME_RW_PRINFO_PRCHK_REF) 585 domain->sig.dif.ref_remap = true; 586 587 domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.apptag); 588 domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.appmask); 589 domain->sig.dif.app_escape = true; 590 if (pi_type == NVME_NS_DPS_PI_TYPE3) 591 domain->sig.dif.ref_escape = true; 592 } 593 594 static void nvmet_rdma_set_sig_attrs(struct nvmet_req *req, 595 struct ib_sig_attrs *sig_attrs) 596 { 597 struct nvme_command *cmd = req->cmd; 598 u16 control = le16_to_cpu(cmd->rw.control); 599 u8 pi_type = req->ns->pi_type; 600 struct blk_integrity *bi; 601 602 bi = bdev_get_integrity(req->ns->bdev); 603 604 memset(sig_attrs, 0, sizeof(*sig_attrs)); 605 606 if (control & NVME_RW_PRINFO_PRACT) { 607 /* for WRITE_INSERT/READ_STRIP no wire domain */ 608 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 609 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control, 610 pi_type); 611 /* Clear the PRACT bit since HCA will generate/verify the PI */ 612 control &= ~NVME_RW_PRINFO_PRACT; 613 cmd->rw.control = cpu_to_le16(control); 614 /* PI is added by the HW */ 615 req->transfer_len += req->metadata_len; 616 } else { 617 /* for WRITE_PASS/READ_PASS both wire/memory domains exist */ 618 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control, 619 pi_type); 620 nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control, 621 pi_type); 622 } 623 624 if (control & NVME_RW_PRINFO_PRCHK_REF) 625 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG; 626 if (control & NVME_RW_PRINFO_PRCHK_GUARD) 627 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD; 628 if (control & NVME_RW_PRINFO_PRCHK_APP) 629 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG; 630 } 631 632 static int nvmet_rdma_rw_ctx_init(struct nvmet_rdma_rsp *rsp, u64 addr, u32 key, 633 struct ib_sig_attrs *sig_attrs) 634 { 635 struct rdma_cm_id *cm_id = rsp->queue->cm_id; 636 struct nvmet_req *req = &rsp->req; 637 int ret; 638 639 if (req->metadata_len) 640 ret = rdma_rw_ctx_signature_init(&rsp->rw, cm_id->qp, 641 cm_id->port_num, req->sg, req->sg_cnt, 642 req->metadata_sg, req->metadata_sg_cnt, sig_attrs, 643 addr, key, nvmet_data_dir(req)); 644 else 645 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num, 646 req->sg, req->sg_cnt, 0, addr, key, 647 nvmet_data_dir(req)); 648 649 return ret; 650 } 651 652 static void nvmet_rdma_rw_ctx_destroy(struct nvmet_rdma_rsp *rsp) 653 { 654 struct rdma_cm_id *cm_id = rsp->queue->cm_id; 655 struct nvmet_req *req = &rsp->req; 656 657 if (req->metadata_len) 658 rdma_rw_ctx_destroy_signature(&rsp->rw, cm_id->qp, 659 cm_id->port_num, req->sg, req->sg_cnt, 660 req->metadata_sg, req->metadata_sg_cnt, 661 nvmet_data_dir(req)); 662 else 663 rdma_rw_ctx_destroy(&rsp->rw, cm_id->qp, cm_id->port_num, 664 req->sg, req->sg_cnt, nvmet_data_dir(req)); 665 } 666 667 static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp) 668 { 669 struct nvmet_rdma_queue *queue = rsp->queue; 670 671 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); 672 673 if (rsp->n_rdma) 674 nvmet_rdma_rw_ctx_destroy(rsp); 675 676 if (rsp->req.sg != rsp->cmd->inline_sg) 677 nvmet_req_free_sgls(&rsp->req); 678 679 if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list))) 680 nvmet_rdma_process_wr_wait_list(queue); 681 682 nvmet_rdma_put_rsp(rsp); 683 } 684 685 static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue) 686 { 687 if (queue->nvme_sq.ctrl) { 688 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl); 689 } else { 690 /* 691 * we didn't setup the controller yet in case 692 * of admin connect error, just disconnect and 693 * cleanup the queue 694 */ 695 nvmet_rdma_queue_disconnect(queue); 696 } 697 } 698 699 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) 700 { 701 struct nvmet_rdma_rsp *rsp = 702 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe); 703 struct nvmet_rdma_queue *queue = cq->cq_context; 704 705 nvmet_rdma_release_rsp(rsp); 706 707 if (unlikely(wc->status != IB_WC_SUCCESS && 708 wc->status != IB_WC_WR_FLUSH_ERR)) { 709 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n", 710 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); 711 nvmet_rdma_error_comp(queue); 712 } 713 } 714 715 static void nvmet_rdma_queue_response(struct nvmet_req *req) 716 { 717 struct nvmet_rdma_rsp *rsp = 718 container_of(req, struct nvmet_rdma_rsp, req); 719 struct rdma_cm_id *cm_id = rsp->queue->cm_id; 720 struct ib_send_wr *first_wr; 721 722 if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) { 723 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV; 724 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey; 725 } else { 726 rsp->send_wr.opcode = IB_WR_SEND; 727 } 728 729 if (nvmet_rdma_need_data_out(rsp)) { 730 if (rsp->req.metadata_len) 731 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp, 732 cm_id->port_num, &rsp->write_cqe, NULL); 733 else 734 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp, 735 cm_id->port_num, NULL, &rsp->send_wr); 736 } else { 737 first_wr = &rsp->send_wr; 738 } 739 740 nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd); 741 742 ib_dma_sync_single_for_device(rsp->queue->dev->device, 743 rsp->send_sge.addr, rsp->send_sge.length, 744 DMA_TO_DEVICE); 745 746 if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) { 747 pr_err("sending cmd response failed\n"); 748 nvmet_rdma_release_rsp(rsp); 749 } 750 } 751 752 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc) 753 { 754 struct nvmet_rdma_rsp *rsp = 755 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe); 756 struct nvmet_rdma_queue *queue = wc->qp->qp_context; 757 u16 status = 0; 758 759 WARN_ON(rsp->n_rdma <= 0); 760 atomic_add(rsp->n_rdma, &queue->sq_wr_avail); 761 rsp->n_rdma = 0; 762 763 if (unlikely(wc->status != IB_WC_SUCCESS)) { 764 nvmet_rdma_rw_ctx_destroy(rsp); 765 nvmet_req_uninit(&rsp->req); 766 nvmet_rdma_release_rsp(rsp); 767 if (wc->status != IB_WC_WR_FLUSH_ERR) { 768 pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n", 769 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status); 770 nvmet_rdma_error_comp(queue); 771 } 772 return; 773 } 774 775 if (rsp->req.metadata_len) 776 status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr); 777 nvmet_rdma_rw_ctx_destroy(rsp); 778 779 if (unlikely(status)) 780 nvmet_req_complete(&rsp->req, status); 781 else 782 rsp->req.execute(&rsp->req); 783 } 784 785 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc) 786 { 787 struct nvmet_rdma_rsp *rsp = 788 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, write_cqe); 789 struct nvmet_rdma_queue *queue = cq->cq_context; 790 struct rdma_cm_id *cm_id = rsp->queue->cm_id; 791 u16 status; 792 793 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 794 return; 795 796 WARN_ON(rsp->n_rdma <= 0); 797 atomic_add(rsp->n_rdma, &queue->sq_wr_avail); 798 rsp->n_rdma = 0; 799 800 if (unlikely(wc->status != IB_WC_SUCCESS)) { 801 nvmet_rdma_rw_ctx_destroy(rsp); 802 nvmet_req_uninit(&rsp->req); 803 nvmet_rdma_release_rsp(rsp); 804 if (wc->status != IB_WC_WR_FLUSH_ERR) { 805 pr_info("RDMA WRITE for CQE 0x%p failed with status %s (%d).\n", 806 wc->wr_cqe, ib_wc_status_msg(wc->status), 807 wc->status); 808 nvmet_rdma_error_comp(queue); 809 } 810 return; 811 } 812 813 /* 814 * Upon RDMA completion check the signature status 815 * - if succeeded send good NVMe response 816 * - if failed send bad NVMe response with appropriate error 817 */ 818 status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr); 819 if (unlikely(status)) 820 rsp->req.cqe->status = cpu_to_le16(status << 1); 821 nvmet_rdma_rw_ctx_destroy(rsp); 822 823 if (unlikely(ib_post_send(cm_id->qp, &rsp->send_wr, NULL))) { 824 pr_err("sending cmd response failed\n"); 825 nvmet_rdma_release_rsp(rsp); 826 } 827 } 828 829 static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len, 830 u64 off) 831 { 832 int sg_count = num_pages(len); 833 struct scatterlist *sg; 834 int i; 835 836 sg = rsp->cmd->inline_sg; 837 for (i = 0; i < sg_count; i++, sg++) { 838 if (i < sg_count - 1) 839 sg_unmark_end(sg); 840 else 841 sg_mark_end(sg); 842 sg->offset = off; 843 sg->length = min_t(int, len, PAGE_SIZE - off); 844 len -= sg->length; 845 if (!i) 846 off = 0; 847 } 848 849 rsp->req.sg = rsp->cmd->inline_sg; 850 rsp->req.sg_cnt = sg_count; 851 } 852 853 static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp) 854 { 855 struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl; 856 u64 off = le64_to_cpu(sgl->addr); 857 u32 len = le32_to_cpu(sgl->length); 858 859 if (!nvme_is_write(rsp->req.cmd)) { 860 rsp->req.error_loc = 861 offsetof(struct nvme_common_command, opcode); 862 return NVME_SC_INVALID_FIELD | NVME_SC_DNR; 863 } 864 865 if (off + len > rsp->queue->dev->inline_data_size) { 866 pr_err("invalid inline data offset!\n"); 867 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR; 868 } 869 870 /* no data command? */ 871 if (!len) 872 return 0; 873 874 nvmet_rdma_use_inline_sg(rsp, len, off); 875 rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA; 876 rsp->req.transfer_len += len; 877 return 0; 878 } 879 880 static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp, 881 struct nvme_keyed_sgl_desc *sgl, bool invalidate) 882 { 883 u64 addr = le64_to_cpu(sgl->addr); 884 u32 key = get_unaligned_le32(sgl->key); 885 struct ib_sig_attrs sig_attrs; 886 int ret; 887 888 rsp->req.transfer_len = get_unaligned_le24(sgl->length); 889 890 /* no data command? */ 891 if (!rsp->req.transfer_len) 892 return 0; 893 894 if (rsp->req.metadata_len) 895 nvmet_rdma_set_sig_attrs(&rsp->req, &sig_attrs); 896 897 ret = nvmet_req_alloc_sgls(&rsp->req); 898 if (unlikely(ret < 0)) 899 goto error_out; 900 901 ret = nvmet_rdma_rw_ctx_init(rsp, addr, key, &sig_attrs); 902 if (unlikely(ret < 0)) 903 goto error_out; 904 rsp->n_rdma += ret; 905 906 if (invalidate) { 907 rsp->invalidate_rkey = key; 908 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY; 909 } 910 911 return 0; 912 913 error_out: 914 rsp->req.transfer_len = 0; 915 return NVME_SC_INTERNAL; 916 } 917 918 static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp) 919 { 920 struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl; 921 922 switch (sgl->type >> 4) { 923 case NVME_SGL_FMT_DATA_DESC: 924 switch (sgl->type & 0xf) { 925 case NVME_SGL_FMT_OFFSET: 926 return nvmet_rdma_map_sgl_inline(rsp); 927 default: 928 pr_err("invalid SGL subtype: %#x\n", sgl->type); 929 rsp->req.error_loc = 930 offsetof(struct nvme_common_command, dptr); 931 return NVME_SC_INVALID_FIELD | NVME_SC_DNR; 932 } 933 case NVME_KEY_SGL_FMT_DATA_DESC: 934 switch (sgl->type & 0xf) { 935 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE: 936 return nvmet_rdma_map_sgl_keyed(rsp, sgl, true); 937 case NVME_SGL_FMT_ADDRESS: 938 return nvmet_rdma_map_sgl_keyed(rsp, sgl, false); 939 default: 940 pr_err("invalid SGL subtype: %#x\n", sgl->type); 941 rsp->req.error_loc = 942 offsetof(struct nvme_common_command, dptr); 943 return NVME_SC_INVALID_FIELD | NVME_SC_DNR; 944 } 945 default: 946 pr_err("invalid SGL type: %#x\n", sgl->type); 947 rsp->req.error_loc = offsetof(struct nvme_common_command, dptr); 948 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR; 949 } 950 } 951 952 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp) 953 { 954 struct nvmet_rdma_queue *queue = rsp->queue; 955 956 if (unlikely(atomic_sub_return(1 + rsp->n_rdma, 957 &queue->sq_wr_avail) < 0)) { 958 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n", 959 1 + rsp->n_rdma, queue->idx, 960 queue->nvme_sq.ctrl->cntlid); 961 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail); 962 return false; 963 } 964 965 if (nvmet_rdma_need_data_in(rsp)) { 966 if (rdma_rw_ctx_post(&rsp->rw, queue->qp, 967 queue->cm_id->port_num, &rsp->read_cqe, NULL)) 968 nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR); 969 } else { 970 rsp->req.execute(&rsp->req); 971 } 972 973 return true; 974 } 975 976 static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, 977 struct nvmet_rdma_rsp *cmd) 978 { 979 u16 status; 980 981 ib_dma_sync_single_for_cpu(queue->dev->device, 982 cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length, 983 DMA_FROM_DEVICE); 984 ib_dma_sync_single_for_cpu(queue->dev->device, 985 cmd->send_sge.addr, cmd->send_sge.length, 986 DMA_TO_DEVICE); 987 988 if (!nvmet_req_init(&cmd->req, &queue->nvme_cq, 989 &queue->nvme_sq, &nvmet_rdma_ops)) 990 return; 991 992 status = nvmet_rdma_map_sgl(cmd); 993 if (status) 994 goto out_err; 995 996 if (unlikely(!nvmet_rdma_execute_command(cmd))) { 997 spin_lock(&queue->rsp_wr_wait_lock); 998 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list); 999 spin_unlock(&queue->rsp_wr_wait_lock); 1000 } 1001 1002 return; 1003 1004 out_err: 1005 nvmet_req_complete(&cmd->req, status); 1006 } 1007 1008 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) 1009 { 1010 struct nvmet_rdma_cmd *cmd = 1011 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe); 1012 struct nvmet_rdma_queue *queue = wc->qp->qp_context; 1013 struct nvmet_rdma_rsp *rsp; 1014 1015 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1016 if (wc->status != IB_WC_WR_FLUSH_ERR) { 1017 pr_err("RECV for CQE 0x%p failed with status %s (%d)\n", 1018 wc->wr_cqe, ib_wc_status_msg(wc->status), 1019 wc->status); 1020 nvmet_rdma_error_comp(queue); 1021 } 1022 return; 1023 } 1024 1025 if (unlikely(wc->byte_len < sizeof(struct nvme_command))) { 1026 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n"); 1027 nvmet_rdma_error_comp(queue); 1028 return; 1029 } 1030 1031 cmd->queue = queue; 1032 rsp = nvmet_rdma_get_rsp(queue); 1033 if (unlikely(!rsp)) { 1034 /* 1035 * we get here only under memory pressure, 1036 * silently drop and have the host retry 1037 * as we can't even fail it. 1038 */ 1039 nvmet_rdma_post_recv(queue->dev, cmd); 1040 return; 1041 } 1042 rsp->queue = queue; 1043 rsp->cmd = cmd; 1044 rsp->flags = 0; 1045 rsp->req.cmd = cmd->nvme_cmd; 1046 rsp->req.port = queue->port; 1047 rsp->n_rdma = 0; 1048 1049 if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { 1050 unsigned long flags; 1051 1052 spin_lock_irqsave(&queue->state_lock, flags); 1053 if (queue->state == NVMET_RDMA_Q_CONNECTING) 1054 list_add_tail(&rsp->wait_list, &queue->rsp_wait_list); 1055 else 1056 nvmet_rdma_put_rsp(rsp); 1057 spin_unlock_irqrestore(&queue->state_lock, flags); 1058 return; 1059 } 1060 1061 nvmet_rdma_handle_command(queue, rsp); 1062 } 1063 1064 static void nvmet_rdma_destroy_srq(struct nvmet_rdma_srq *nsrq) 1065 { 1066 nvmet_rdma_free_cmds(nsrq->ndev, nsrq->cmds, nsrq->ndev->srq_size, 1067 false); 1068 ib_destroy_srq(nsrq->srq); 1069 1070 kfree(nsrq); 1071 } 1072 1073 static void nvmet_rdma_destroy_srqs(struct nvmet_rdma_device *ndev) 1074 { 1075 int i; 1076 1077 if (!ndev->srqs) 1078 return; 1079 1080 for (i = 0; i < ndev->srq_count; i++) 1081 nvmet_rdma_destroy_srq(ndev->srqs[i]); 1082 1083 kfree(ndev->srqs); 1084 } 1085 1086 static struct nvmet_rdma_srq * 1087 nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev) 1088 { 1089 struct ib_srq_init_attr srq_attr = { NULL, }; 1090 size_t srq_size = ndev->srq_size; 1091 struct nvmet_rdma_srq *nsrq; 1092 struct ib_srq *srq; 1093 int ret, i; 1094 1095 nsrq = kzalloc(sizeof(*nsrq), GFP_KERNEL); 1096 if (!nsrq) 1097 return ERR_PTR(-ENOMEM); 1098 1099 srq_attr.attr.max_wr = srq_size; 1100 srq_attr.attr.max_sge = 1 + ndev->inline_page_count; 1101 srq_attr.attr.srq_limit = 0; 1102 srq_attr.srq_type = IB_SRQT_BASIC; 1103 srq = ib_create_srq(ndev->pd, &srq_attr); 1104 if (IS_ERR(srq)) { 1105 ret = PTR_ERR(srq); 1106 goto out_free; 1107 } 1108 1109 nsrq->cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false); 1110 if (IS_ERR(nsrq->cmds)) { 1111 ret = PTR_ERR(nsrq->cmds); 1112 goto out_destroy_srq; 1113 } 1114 1115 nsrq->srq = srq; 1116 nsrq->ndev = ndev; 1117 1118 for (i = 0; i < srq_size; i++) { 1119 nsrq->cmds[i].nsrq = nsrq; 1120 ret = nvmet_rdma_post_recv(ndev, &nsrq->cmds[i]); 1121 if (ret) 1122 goto out_free_cmds; 1123 } 1124 1125 return nsrq; 1126 1127 out_free_cmds: 1128 nvmet_rdma_free_cmds(ndev, nsrq->cmds, srq_size, false); 1129 out_destroy_srq: 1130 ib_destroy_srq(srq); 1131 out_free: 1132 kfree(nsrq); 1133 return ERR_PTR(ret); 1134 } 1135 1136 static int nvmet_rdma_init_srqs(struct nvmet_rdma_device *ndev) 1137 { 1138 int i, ret; 1139 1140 if (!ndev->device->attrs.max_srq_wr || !ndev->device->attrs.max_srq) { 1141 /* 1142 * If SRQs aren't supported we just go ahead and use normal 1143 * non-shared receive queues. 1144 */ 1145 pr_info("SRQ requested but not supported.\n"); 1146 return 0; 1147 } 1148 1149 ndev->srq_size = min(ndev->device->attrs.max_srq_wr, 1150 nvmet_rdma_srq_size); 1151 ndev->srq_count = min(ndev->device->num_comp_vectors, 1152 ndev->device->attrs.max_srq); 1153 1154 ndev->srqs = kcalloc(ndev->srq_count, sizeof(*ndev->srqs), GFP_KERNEL); 1155 if (!ndev->srqs) 1156 return -ENOMEM; 1157 1158 for (i = 0; i < ndev->srq_count; i++) { 1159 ndev->srqs[i] = nvmet_rdma_init_srq(ndev); 1160 if (IS_ERR(ndev->srqs[i])) { 1161 ret = PTR_ERR(ndev->srqs[i]); 1162 goto err_srq; 1163 } 1164 } 1165 1166 return 0; 1167 1168 err_srq: 1169 while (--i >= 0) 1170 nvmet_rdma_destroy_srq(ndev->srqs[i]); 1171 kfree(ndev->srqs); 1172 return ret; 1173 } 1174 1175 static void nvmet_rdma_free_dev(struct kref *ref) 1176 { 1177 struct nvmet_rdma_device *ndev = 1178 container_of(ref, struct nvmet_rdma_device, ref); 1179 1180 mutex_lock(&device_list_mutex); 1181 list_del(&ndev->entry); 1182 mutex_unlock(&device_list_mutex); 1183 1184 nvmet_rdma_destroy_srqs(ndev); 1185 ib_dealloc_pd(ndev->pd); 1186 1187 kfree(ndev); 1188 } 1189 1190 static struct nvmet_rdma_device * 1191 nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id) 1192 { 1193 struct nvmet_rdma_port *port = cm_id->context; 1194 struct nvmet_port *nport = port->nport; 1195 struct nvmet_rdma_device *ndev; 1196 int inline_page_count; 1197 int inline_sge_count; 1198 int ret; 1199 1200 mutex_lock(&device_list_mutex); 1201 list_for_each_entry(ndev, &device_list, entry) { 1202 if (ndev->device->node_guid == cm_id->device->node_guid && 1203 kref_get_unless_zero(&ndev->ref)) 1204 goto out_unlock; 1205 } 1206 1207 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); 1208 if (!ndev) 1209 goto out_err; 1210 1211 inline_page_count = num_pages(nport->inline_data_size); 1212 inline_sge_count = max(cm_id->device->attrs.max_sge_rd, 1213 cm_id->device->attrs.max_recv_sge) - 1; 1214 if (inline_page_count > inline_sge_count) { 1215 pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n", 1216 nport->inline_data_size, cm_id->device->name, 1217 inline_sge_count * PAGE_SIZE); 1218 nport->inline_data_size = inline_sge_count * PAGE_SIZE; 1219 inline_page_count = inline_sge_count; 1220 } 1221 ndev->inline_data_size = nport->inline_data_size; 1222 ndev->inline_page_count = inline_page_count; 1223 1224 if (nport->pi_enable && !(cm_id->device->attrs.device_cap_flags & 1225 IB_DEVICE_INTEGRITY_HANDOVER)) { 1226 pr_warn("T10-PI is not supported by device %s. Disabling it\n", 1227 cm_id->device->name); 1228 nport->pi_enable = false; 1229 } 1230 1231 ndev->device = cm_id->device; 1232 kref_init(&ndev->ref); 1233 1234 ndev->pd = ib_alloc_pd(ndev->device, 0); 1235 if (IS_ERR(ndev->pd)) 1236 goto out_free_dev; 1237 1238 if (nvmet_rdma_use_srq) { 1239 ret = nvmet_rdma_init_srqs(ndev); 1240 if (ret) 1241 goto out_free_pd; 1242 } 1243 1244 list_add(&ndev->entry, &device_list); 1245 out_unlock: 1246 mutex_unlock(&device_list_mutex); 1247 pr_debug("added %s.\n", ndev->device->name); 1248 return ndev; 1249 1250 out_free_pd: 1251 ib_dealloc_pd(ndev->pd); 1252 out_free_dev: 1253 kfree(ndev); 1254 out_err: 1255 mutex_unlock(&device_list_mutex); 1256 return NULL; 1257 } 1258 1259 static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue) 1260 { 1261 struct ib_qp_init_attr qp_attr; 1262 struct nvmet_rdma_device *ndev = queue->dev; 1263 int nr_cqe, ret, i, factor; 1264 1265 /* 1266 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND. 1267 */ 1268 nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size; 1269 1270 queue->cq = ib_cq_pool_get(ndev->device, nr_cqe + 1, 1271 queue->comp_vector, IB_POLL_WORKQUEUE); 1272 if (IS_ERR(queue->cq)) { 1273 ret = PTR_ERR(queue->cq); 1274 pr_err("failed to create CQ cqe= %d ret= %d\n", 1275 nr_cqe + 1, ret); 1276 goto out; 1277 } 1278 1279 memset(&qp_attr, 0, sizeof(qp_attr)); 1280 qp_attr.qp_context = queue; 1281 qp_attr.event_handler = nvmet_rdma_qp_event; 1282 qp_attr.send_cq = queue->cq; 1283 qp_attr.recv_cq = queue->cq; 1284 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 1285 qp_attr.qp_type = IB_QPT_RC; 1286 /* +1 for drain */ 1287 qp_attr.cap.max_send_wr = queue->send_queue_size + 1; 1288 factor = rdma_rw_mr_factor(ndev->device, queue->cm_id->port_num, 1289 1 << NVMET_RDMA_MAX_MDTS); 1290 qp_attr.cap.max_rdma_ctxs = queue->send_queue_size * factor; 1291 qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd, 1292 ndev->device->attrs.max_send_sge); 1293 1294 if (queue->nsrq) { 1295 qp_attr.srq = queue->nsrq->srq; 1296 } else { 1297 /* +1 for drain */ 1298 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size; 1299 qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count; 1300 } 1301 1302 if (queue->port->pi_enable && queue->host_qid) 1303 qp_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; 1304 1305 ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr); 1306 if (ret) { 1307 pr_err("failed to create_qp ret= %d\n", ret); 1308 goto err_destroy_cq; 1309 } 1310 queue->qp = queue->cm_id->qp; 1311 1312 atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr); 1313 1314 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", 1315 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge, 1316 qp_attr.cap.max_send_wr, queue->cm_id); 1317 1318 if (!queue->nsrq) { 1319 for (i = 0; i < queue->recv_queue_size; i++) { 1320 queue->cmds[i].queue = queue; 1321 ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]); 1322 if (ret) 1323 goto err_destroy_qp; 1324 } 1325 } 1326 1327 out: 1328 return ret; 1329 1330 err_destroy_qp: 1331 rdma_destroy_qp(queue->cm_id); 1332 err_destroy_cq: 1333 ib_cq_pool_put(queue->cq, nr_cqe + 1); 1334 goto out; 1335 } 1336 1337 static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue) 1338 { 1339 ib_drain_qp(queue->qp); 1340 if (queue->cm_id) 1341 rdma_destroy_id(queue->cm_id); 1342 ib_destroy_qp(queue->qp); 1343 ib_cq_pool_put(queue->cq, queue->recv_queue_size + 2 * 1344 queue->send_queue_size + 1); 1345 } 1346 1347 static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue) 1348 { 1349 pr_debug("freeing queue %d\n", queue->idx); 1350 1351 nvmet_sq_destroy(&queue->nvme_sq); 1352 1353 nvmet_rdma_destroy_queue_ib(queue); 1354 if (!queue->nsrq) { 1355 nvmet_rdma_free_cmds(queue->dev, queue->cmds, 1356 queue->recv_queue_size, 1357 !queue->host_qid); 1358 } 1359 nvmet_rdma_free_rsps(queue); 1360 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); 1361 kfree(queue); 1362 } 1363 1364 static void nvmet_rdma_release_queue_work(struct work_struct *w) 1365 { 1366 struct nvmet_rdma_queue *queue = 1367 container_of(w, struct nvmet_rdma_queue, release_work); 1368 struct nvmet_rdma_device *dev = queue->dev; 1369 1370 nvmet_rdma_free_queue(queue); 1371 1372 kref_put(&dev->ref, nvmet_rdma_free_dev); 1373 } 1374 1375 static int 1376 nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn, 1377 struct nvmet_rdma_queue *queue) 1378 { 1379 struct nvme_rdma_cm_req *req; 1380 1381 req = (struct nvme_rdma_cm_req *)conn->private_data; 1382 if (!req || conn->private_data_len == 0) 1383 return NVME_RDMA_CM_INVALID_LEN; 1384 1385 if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0) 1386 return NVME_RDMA_CM_INVALID_RECFMT; 1387 1388 queue->host_qid = le16_to_cpu(req->qid); 1389 1390 /* 1391 * req->hsqsize corresponds to our recv queue size plus 1 1392 * req->hrqsize corresponds to our send queue size 1393 */ 1394 queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1; 1395 queue->send_queue_size = le16_to_cpu(req->hrqsize); 1396 1397 if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH) 1398 return NVME_RDMA_CM_INVALID_HSQSIZE; 1399 1400 /* XXX: Should we enforce some kind of max for IO queues? */ 1401 1402 return 0; 1403 } 1404 1405 static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id, 1406 enum nvme_rdma_cm_status status) 1407 { 1408 struct nvme_rdma_cm_rej rej; 1409 1410 pr_debug("rejecting connect request: status %d (%s)\n", 1411 status, nvme_rdma_cm_msg(status)); 1412 1413 rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); 1414 rej.sts = cpu_to_le16(status); 1415 1416 return rdma_reject(cm_id, (void *)&rej, sizeof(rej), 1417 IB_CM_REJ_CONSUMER_DEFINED); 1418 } 1419 1420 static struct nvmet_rdma_queue * 1421 nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev, 1422 struct rdma_cm_id *cm_id, 1423 struct rdma_cm_event *event) 1424 { 1425 struct nvmet_rdma_port *port = cm_id->context; 1426 struct nvmet_rdma_queue *queue; 1427 int ret; 1428 1429 queue = kzalloc(sizeof(*queue), GFP_KERNEL); 1430 if (!queue) { 1431 ret = NVME_RDMA_CM_NO_RSC; 1432 goto out_reject; 1433 } 1434 1435 ret = nvmet_sq_init(&queue->nvme_sq); 1436 if (ret) { 1437 ret = NVME_RDMA_CM_NO_RSC; 1438 goto out_free_queue; 1439 } 1440 1441 ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue); 1442 if (ret) 1443 goto out_destroy_sq; 1444 1445 /* 1446 * Schedules the actual release because calling rdma_destroy_id from 1447 * inside a CM callback would trigger a deadlock. (great API design..) 1448 */ 1449 INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work); 1450 queue->dev = ndev; 1451 queue->cm_id = cm_id; 1452 queue->port = port->nport; 1453 1454 spin_lock_init(&queue->state_lock); 1455 queue->state = NVMET_RDMA_Q_CONNECTING; 1456 INIT_LIST_HEAD(&queue->rsp_wait_list); 1457 INIT_LIST_HEAD(&queue->rsp_wr_wait_list); 1458 spin_lock_init(&queue->rsp_wr_wait_lock); 1459 INIT_LIST_HEAD(&queue->free_rsps); 1460 spin_lock_init(&queue->rsps_lock); 1461 INIT_LIST_HEAD(&queue->queue_list); 1462 1463 queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL); 1464 if (queue->idx < 0) { 1465 ret = NVME_RDMA_CM_NO_RSC; 1466 goto out_destroy_sq; 1467 } 1468 1469 /* 1470 * Spread the io queues across completion vectors, 1471 * but still keep all admin queues on vector 0. 1472 */ 1473 queue->comp_vector = !queue->host_qid ? 0 : 1474 queue->idx % ndev->device->num_comp_vectors; 1475 1476 1477 ret = nvmet_rdma_alloc_rsps(queue); 1478 if (ret) { 1479 ret = NVME_RDMA_CM_NO_RSC; 1480 goto out_ida_remove; 1481 } 1482 1483 if (ndev->srqs) { 1484 queue->nsrq = ndev->srqs[queue->comp_vector % ndev->srq_count]; 1485 } else { 1486 queue->cmds = nvmet_rdma_alloc_cmds(ndev, 1487 queue->recv_queue_size, 1488 !queue->host_qid); 1489 if (IS_ERR(queue->cmds)) { 1490 ret = NVME_RDMA_CM_NO_RSC; 1491 goto out_free_responses; 1492 } 1493 } 1494 1495 ret = nvmet_rdma_create_queue_ib(queue); 1496 if (ret) { 1497 pr_err("%s: creating RDMA queue failed (%d).\n", 1498 __func__, ret); 1499 ret = NVME_RDMA_CM_NO_RSC; 1500 goto out_free_cmds; 1501 } 1502 1503 return queue; 1504 1505 out_free_cmds: 1506 if (!queue->nsrq) { 1507 nvmet_rdma_free_cmds(queue->dev, queue->cmds, 1508 queue->recv_queue_size, 1509 !queue->host_qid); 1510 } 1511 out_free_responses: 1512 nvmet_rdma_free_rsps(queue); 1513 out_ida_remove: 1514 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx); 1515 out_destroy_sq: 1516 nvmet_sq_destroy(&queue->nvme_sq); 1517 out_free_queue: 1518 kfree(queue); 1519 out_reject: 1520 nvmet_rdma_cm_reject(cm_id, ret); 1521 return NULL; 1522 } 1523 1524 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv) 1525 { 1526 struct nvmet_rdma_queue *queue = priv; 1527 1528 switch (event->event) { 1529 case IB_EVENT_COMM_EST: 1530 rdma_notify(queue->cm_id, event->event); 1531 break; 1532 case IB_EVENT_QP_LAST_WQE_REACHED: 1533 pr_debug("received last WQE reached event for queue=0x%p\n", 1534 queue); 1535 break; 1536 default: 1537 pr_err("received IB QP event: %s (%d)\n", 1538 ib_event_msg(event->event), event->event); 1539 break; 1540 } 1541 } 1542 1543 static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id, 1544 struct nvmet_rdma_queue *queue, 1545 struct rdma_conn_param *p) 1546 { 1547 struct rdma_conn_param param = { }; 1548 struct nvme_rdma_cm_rep priv = { }; 1549 int ret = -ENOMEM; 1550 1551 param.rnr_retry_count = 7; 1552 param.flow_control = 1; 1553 param.initiator_depth = min_t(u8, p->initiator_depth, 1554 queue->dev->device->attrs.max_qp_init_rd_atom); 1555 param.private_data = &priv; 1556 param.private_data_len = sizeof(priv); 1557 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); 1558 priv.crqsize = cpu_to_le16(queue->recv_queue_size); 1559 1560 ret = rdma_accept(cm_id, ¶m); 1561 if (ret) 1562 pr_err("rdma_accept failed (error code = %d)\n", ret); 1563 1564 return ret; 1565 } 1566 1567 static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id, 1568 struct rdma_cm_event *event) 1569 { 1570 struct nvmet_rdma_device *ndev; 1571 struct nvmet_rdma_queue *queue; 1572 int ret = -EINVAL; 1573 1574 ndev = nvmet_rdma_find_get_device(cm_id); 1575 if (!ndev) { 1576 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC); 1577 return -ECONNREFUSED; 1578 } 1579 1580 queue = nvmet_rdma_alloc_queue(ndev, cm_id, event); 1581 if (!queue) { 1582 ret = -ENOMEM; 1583 goto put_device; 1584 } 1585 1586 if (queue->host_qid == 0) { 1587 /* Let inflight controller teardown complete */ 1588 flush_scheduled_work(); 1589 } 1590 1591 ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn); 1592 if (ret) { 1593 /* 1594 * Don't destroy the cm_id in free path, as we implicitly 1595 * destroy the cm_id here with non-zero ret code. 1596 */ 1597 queue->cm_id = NULL; 1598 goto free_queue; 1599 } 1600 1601 mutex_lock(&nvmet_rdma_queue_mutex); 1602 list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list); 1603 mutex_unlock(&nvmet_rdma_queue_mutex); 1604 1605 return 0; 1606 1607 free_queue: 1608 nvmet_rdma_free_queue(queue); 1609 put_device: 1610 kref_put(&ndev->ref, nvmet_rdma_free_dev); 1611 1612 return ret; 1613 } 1614 1615 static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue) 1616 { 1617 unsigned long flags; 1618 1619 spin_lock_irqsave(&queue->state_lock, flags); 1620 if (queue->state != NVMET_RDMA_Q_CONNECTING) { 1621 pr_warn("trying to establish a connected queue\n"); 1622 goto out_unlock; 1623 } 1624 queue->state = NVMET_RDMA_Q_LIVE; 1625 1626 while (!list_empty(&queue->rsp_wait_list)) { 1627 struct nvmet_rdma_rsp *cmd; 1628 1629 cmd = list_first_entry(&queue->rsp_wait_list, 1630 struct nvmet_rdma_rsp, wait_list); 1631 list_del(&cmd->wait_list); 1632 1633 spin_unlock_irqrestore(&queue->state_lock, flags); 1634 nvmet_rdma_handle_command(queue, cmd); 1635 spin_lock_irqsave(&queue->state_lock, flags); 1636 } 1637 1638 out_unlock: 1639 spin_unlock_irqrestore(&queue->state_lock, flags); 1640 } 1641 1642 static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) 1643 { 1644 bool disconnect = false; 1645 unsigned long flags; 1646 1647 pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state); 1648 1649 spin_lock_irqsave(&queue->state_lock, flags); 1650 switch (queue->state) { 1651 case NVMET_RDMA_Q_CONNECTING: 1652 while (!list_empty(&queue->rsp_wait_list)) { 1653 struct nvmet_rdma_rsp *rsp; 1654 1655 rsp = list_first_entry(&queue->rsp_wait_list, 1656 struct nvmet_rdma_rsp, 1657 wait_list); 1658 list_del(&rsp->wait_list); 1659 nvmet_rdma_put_rsp(rsp); 1660 } 1661 fallthrough; 1662 case NVMET_RDMA_Q_LIVE: 1663 queue->state = NVMET_RDMA_Q_DISCONNECTING; 1664 disconnect = true; 1665 break; 1666 case NVMET_RDMA_Q_DISCONNECTING: 1667 break; 1668 } 1669 spin_unlock_irqrestore(&queue->state_lock, flags); 1670 1671 if (disconnect) { 1672 rdma_disconnect(queue->cm_id); 1673 schedule_work(&queue->release_work); 1674 } 1675 } 1676 1677 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) 1678 { 1679 bool disconnect = false; 1680 1681 mutex_lock(&nvmet_rdma_queue_mutex); 1682 if (!list_empty(&queue->queue_list)) { 1683 list_del_init(&queue->queue_list); 1684 disconnect = true; 1685 } 1686 mutex_unlock(&nvmet_rdma_queue_mutex); 1687 1688 if (disconnect) 1689 __nvmet_rdma_queue_disconnect(queue); 1690 } 1691 1692 static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id, 1693 struct nvmet_rdma_queue *queue) 1694 { 1695 WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING); 1696 1697 mutex_lock(&nvmet_rdma_queue_mutex); 1698 if (!list_empty(&queue->queue_list)) 1699 list_del_init(&queue->queue_list); 1700 mutex_unlock(&nvmet_rdma_queue_mutex); 1701 1702 pr_err("failed to connect queue %d\n", queue->idx); 1703 schedule_work(&queue->release_work); 1704 } 1705 1706 /** 1707 * nvme_rdma_device_removal() - Handle RDMA device removal 1708 * @cm_id: rdma_cm id, used for nvmet port 1709 * @queue: nvmet rdma queue (cm id qp_context) 1710 * 1711 * DEVICE_REMOVAL event notifies us that the RDMA device is about 1712 * to unplug. Note that this event can be generated on a normal 1713 * queue cm_id and/or a device bound listener cm_id (where in this 1714 * case queue will be null). 1715 * 1716 * We registered an ib_client to handle device removal for queues, 1717 * so we only need to handle the listening port cm_ids. In this case 1718 * we nullify the priv to prevent double cm_id destruction and destroying 1719 * the cm_id implicitely by returning a non-zero rc to the callout. 1720 */ 1721 static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id, 1722 struct nvmet_rdma_queue *queue) 1723 { 1724 struct nvmet_rdma_port *port; 1725 1726 if (queue) { 1727 /* 1728 * This is a queue cm_id. we have registered 1729 * an ib_client to handle queues removal 1730 * so don't interfear and just return. 1731 */ 1732 return 0; 1733 } 1734 1735 port = cm_id->context; 1736 1737 /* 1738 * This is a listener cm_id. Make sure that 1739 * future remove_port won't invoke a double 1740 * cm_id destroy. use atomic xchg to make sure 1741 * we don't compete with remove_port. 1742 */ 1743 if (xchg(&port->cm_id, NULL) != cm_id) 1744 return 0; 1745 1746 /* 1747 * We need to return 1 so that the core will destroy 1748 * it's own ID. What a great API design.. 1749 */ 1750 return 1; 1751 } 1752 1753 static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id, 1754 struct rdma_cm_event *event) 1755 { 1756 struct nvmet_rdma_queue *queue = NULL; 1757 int ret = 0; 1758 1759 if (cm_id->qp) 1760 queue = cm_id->qp->qp_context; 1761 1762 pr_debug("%s (%d): status %d id %p\n", 1763 rdma_event_msg(event->event), event->event, 1764 event->status, cm_id); 1765 1766 switch (event->event) { 1767 case RDMA_CM_EVENT_CONNECT_REQUEST: 1768 ret = nvmet_rdma_queue_connect(cm_id, event); 1769 break; 1770 case RDMA_CM_EVENT_ESTABLISHED: 1771 nvmet_rdma_queue_established(queue); 1772 break; 1773 case RDMA_CM_EVENT_ADDR_CHANGE: 1774 if (!queue) { 1775 struct nvmet_rdma_port *port = cm_id->context; 1776 1777 schedule_delayed_work(&port->repair_work, 0); 1778 break; 1779 } 1780 fallthrough; 1781 case RDMA_CM_EVENT_DISCONNECTED: 1782 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 1783 nvmet_rdma_queue_disconnect(queue); 1784 break; 1785 case RDMA_CM_EVENT_DEVICE_REMOVAL: 1786 ret = nvmet_rdma_device_removal(cm_id, queue); 1787 break; 1788 case RDMA_CM_EVENT_REJECTED: 1789 pr_debug("Connection rejected: %s\n", 1790 rdma_reject_msg(cm_id, event->status)); 1791 fallthrough; 1792 case RDMA_CM_EVENT_UNREACHABLE: 1793 case RDMA_CM_EVENT_CONNECT_ERROR: 1794 nvmet_rdma_queue_connect_fail(cm_id, queue); 1795 break; 1796 default: 1797 pr_err("received unrecognized RDMA CM event %d\n", 1798 event->event); 1799 break; 1800 } 1801 1802 return ret; 1803 } 1804 1805 static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl) 1806 { 1807 struct nvmet_rdma_queue *queue; 1808 1809 restart: 1810 mutex_lock(&nvmet_rdma_queue_mutex); 1811 list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) { 1812 if (queue->nvme_sq.ctrl == ctrl) { 1813 list_del_init(&queue->queue_list); 1814 mutex_unlock(&nvmet_rdma_queue_mutex); 1815 1816 __nvmet_rdma_queue_disconnect(queue); 1817 goto restart; 1818 } 1819 } 1820 mutex_unlock(&nvmet_rdma_queue_mutex); 1821 } 1822 1823 static void nvmet_rdma_disable_port(struct nvmet_rdma_port *port) 1824 { 1825 struct rdma_cm_id *cm_id = xchg(&port->cm_id, NULL); 1826 1827 if (cm_id) 1828 rdma_destroy_id(cm_id); 1829 } 1830 1831 static int nvmet_rdma_enable_port(struct nvmet_rdma_port *port) 1832 { 1833 struct sockaddr *addr = (struct sockaddr *)&port->addr; 1834 struct rdma_cm_id *cm_id; 1835 int ret; 1836 1837 cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port, 1838 RDMA_PS_TCP, IB_QPT_RC); 1839 if (IS_ERR(cm_id)) { 1840 pr_err("CM ID creation failed\n"); 1841 return PTR_ERR(cm_id); 1842 } 1843 1844 /* 1845 * Allow both IPv4 and IPv6 sockets to bind a single port 1846 * at the same time. 1847 */ 1848 ret = rdma_set_afonly(cm_id, 1); 1849 if (ret) { 1850 pr_err("rdma_set_afonly failed (%d)\n", ret); 1851 goto out_destroy_id; 1852 } 1853 1854 ret = rdma_bind_addr(cm_id, addr); 1855 if (ret) { 1856 pr_err("binding CM ID to %pISpcs failed (%d)\n", addr, ret); 1857 goto out_destroy_id; 1858 } 1859 1860 ret = rdma_listen(cm_id, 128); 1861 if (ret) { 1862 pr_err("listening to %pISpcs failed (%d)\n", addr, ret); 1863 goto out_destroy_id; 1864 } 1865 1866 port->cm_id = cm_id; 1867 return 0; 1868 1869 out_destroy_id: 1870 rdma_destroy_id(cm_id); 1871 return ret; 1872 } 1873 1874 static void nvmet_rdma_repair_port_work(struct work_struct *w) 1875 { 1876 struct nvmet_rdma_port *port = container_of(to_delayed_work(w), 1877 struct nvmet_rdma_port, repair_work); 1878 int ret; 1879 1880 nvmet_rdma_disable_port(port); 1881 ret = nvmet_rdma_enable_port(port); 1882 if (ret) 1883 schedule_delayed_work(&port->repair_work, 5 * HZ); 1884 } 1885 1886 static int nvmet_rdma_add_port(struct nvmet_port *nport) 1887 { 1888 struct nvmet_rdma_port *port; 1889 __kernel_sa_family_t af; 1890 int ret; 1891 1892 port = kzalloc(sizeof(*port), GFP_KERNEL); 1893 if (!port) 1894 return -ENOMEM; 1895 1896 nport->priv = port; 1897 port->nport = nport; 1898 INIT_DELAYED_WORK(&port->repair_work, nvmet_rdma_repair_port_work); 1899 1900 switch (nport->disc_addr.adrfam) { 1901 case NVMF_ADDR_FAMILY_IP4: 1902 af = AF_INET; 1903 break; 1904 case NVMF_ADDR_FAMILY_IP6: 1905 af = AF_INET6; 1906 break; 1907 default: 1908 pr_err("address family %d not supported\n", 1909 nport->disc_addr.adrfam); 1910 ret = -EINVAL; 1911 goto out_free_port; 1912 } 1913 1914 if (nport->inline_data_size < 0) { 1915 nport->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE; 1916 } else if (nport->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) { 1917 pr_warn("inline_data_size %u is too large, reducing to %u\n", 1918 nport->inline_data_size, 1919 NVMET_RDMA_MAX_INLINE_DATA_SIZE); 1920 nport->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE; 1921 } 1922 1923 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr, 1924 nport->disc_addr.trsvcid, &port->addr); 1925 if (ret) { 1926 pr_err("malformed ip/port passed: %s:%s\n", 1927 nport->disc_addr.traddr, nport->disc_addr.trsvcid); 1928 goto out_free_port; 1929 } 1930 1931 ret = nvmet_rdma_enable_port(port); 1932 if (ret) 1933 goto out_free_port; 1934 1935 pr_info("enabling port %d (%pISpcs)\n", 1936 le16_to_cpu(nport->disc_addr.portid), 1937 (struct sockaddr *)&port->addr); 1938 1939 return 0; 1940 1941 out_free_port: 1942 kfree(port); 1943 return ret; 1944 } 1945 1946 static void nvmet_rdma_remove_port(struct nvmet_port *nport) 1947 { 1948 struct nvmet_rdma_port *port = nport->priv; 1949 1950 cancel_delayed_work_sync(&port->repair_work); 1951 nvmet_rdma_disable_port(port); 1952 kfree(port); 1953 } 1954 1955 static void nvmet_rdma_disc_port_addr(struct nvmet_req *req, 1956 struct nvmet_port *nport, char *traddr) 1957 { 1958 struct nvmet_rdma_port *port = nport->priv; 1959 struct rdma_cm_id *cm_id = port->cm_id; 1960 1961 if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) { 1962 struct nvmet_rdma_rsp *rsp = 1963 container_of(req, struct nvmet_rdma_rsp, req); 1964 struct rdma_cm_id *req_cm_id = rsp->queue->cm_id; 1965 struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr; 1966 1967 sprintf(traddr, "%pISc", addr); 1968 } else { 1969 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE); 1970 } 1971 } 1972 1973 static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl) 1974 { 1975 if (ctrl->pi_support) 1976 return NVMET_RDMA_MAX_METADATA_MDTS; 1977 return NVMET_RDMA_MAX_MDTS; 1978 } 1979 1980 static const struct nvmet_fabrics_ops nvmet_rdma_ops = { 1981 .owner = THIS_MODULE, 1982 .type = NVMF_TRTYPE_RDMA, 1983 .msdbd = 1, 1984 .flags = NVMF_KEYED_SGLS | NVMF_METADATA_SUPPORTED, 1985 .add_port = nvmet_rdma_add_port, 1986 .remove_port = nvmet_rdma_remove_port, 1987 .queue_response = nvmet_rdma_queue_response, 1988 .delete_ctrl = nvmet_rdma_delete_ctrl, 1989 .disc_traddr = nvmet_rdma_disc_port_addr, 1990 .get_mdts = nvmet_rdma_get_mdts, 1991 }; 1992 1993 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data) 1994 { 1995 struct nvmet_rdma_queue *queue, *tmp; 1996 struct nvmet_rdma_device *ndev; 1997 bool found = false; 1998 1999 mutex_lock(&device_list_mutex); 2000 list_for_each_entry(ndev, &device_list, entry) { 2001 if (ndev->device == ib_device) { 2002 found = true; 2003 break; 2004 } 2005 } 2006 mutex_unlock(&device_list_mutex); 2007 2008 if (!found) 2009 return; 2010 2011 /* 2012 * IB Device that is used by nvmet controllers is being removed, 2013 * delete all queues using this device. 2014 */ 2015 mutex_lock(&nvmet_rdma_queue_mutex); 2016 list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list, 2017 queue_list) { 2018 if (queue->dev->device != ib_device) 2019 continue; 2020 2021 pr_info("Removing queue %d\n", queue->idx); 2022 list_del_init(&queue->queue_list); 2023 __nvmet_rdma_queue_disconnect(queue); 2024 } 2025 mutex_unlock(&nvmet_rdma_queue_mutex); 2026 2027 flush_scheduled_work(); 2028 } 2029 2030 static struct ib_client nvmet_rdma_ib_client = { 2031 .name = "nvmet_rdma", 2032 .remove = nvmet_rdma_remove_one 2033 }; 2034 2035 static int __init nvmet_rdma_init(void) 2036 { 2037 int ret; 2038 2039 ret = ib_register_client(&nvmet_rdma_ib_client); 2040 if (ret) 2041 return ret; 2042 2043 ret = nvmet_register_transport(&nvmet_rdma_ops); 2044 if (ret) 2045 goto err_ib_client; 2046 2047 return 0; 2048 2049 err_ib_client: 2050 ib_unregister_client(&nvmet_rdma_ib_client); 2051 return ret; 2052 } 2053 2054 static void __exit nvmet_rdma_exit(void) 2055 { 2056 nvmet_unregister_transport(&nvmet_rdma_ops); 2057 ib_unregister_client(&nvmet_rdma_ib_client); 2058 WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list)); 2059 ida_destroy(&nvmet_rdma_queue_ida); 2060 } 2061 2062 module_init(nvmet_rdma_init); 2063 module_exit(nvmet_rdma_exit); 2064 2065 MODULE_LICENSE("GPL v2"); 2066 MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */ 2067