Git Repo - linux.git/blob - drivers/nvme/host/rdma.c

1 // SPDX-License-Identifier: GPL-2.0

2 /*

3 * NVMe over Fabrics RDMA host code.

5 */

6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

7 #include <linux/module.h>

8 #include <linux/init.h>

9 #include <linux/slab.h>

10 #include <rdma/mr_pool.h>

11 #include <linux/err.h>

12 #include <linux/string.h>

13 #include <linux/atomic.h>

14 #include <linux/blk-mq.h>

15 #include <linux/blk-integrity.h>

16 #include <linux/types.h>

17 #include <linux/list.h>

18 #include <linux/mutex.h>

19 #include <linux/scatterlist.h>

20 #include <linux/nvme.h>

21 #include <linux/unaligned.h>

23 #include <rdma/ib_verbs.h>

24 #include <rdma/rdma_cm.h>

25 #include <linux/nvme-rdma.h>

27 #include "nvme.h"

28 #include "fabrics.h"

31 #define NVME_RDMA_CM_TIMEOUT_MS 3000 /* 3 second */

33 #define NVME_RDMA_MAX_SEGMENTS 256

35 #define NVME_RDMA_MAX_INLINE_SEGMENTS 4

37 #define NVME_RDMA_DATA_SGL_SIZE \

38 (sizeof(struct scatterlist) * NVME_INLINE_SG_CNT)

39 #define NVME_RDMA_METADATA_SGL_SIZE \

40 (sizeof(struct scatterlist) * NVME_INLINE_METADATA_SG_CNT)

42 struct nvme_rdma_device {

43 struct ib_device *dev;

44 struct ib_pd *pd;

45 struct kref ref;

46 struct list_head entry;

47 unsigned int num_inline_segments;

48 };

50 struct nvme_rdma_qe {

51 struct ib_cqe cqe;

52 void *data;

53 u64 dma;

54 };

56 struct nvme_rdma_sgl {

57 int nents;

58 struct sg_table sg_table;

59 };

61 struct nvme_rdma_queue;

62 struct nvme_rdma_request {

63 struct nvme_request req;

64 struct ib_mr *mr;

65 struct nvme_rdma_qe sqe;

66 union nvme_result result;

67 __le16 status;

68 refcount_t ref;

69 struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];

70 u32 num_sge;

71 struct ib_reg_wr reg_wr;

72 struct ib_cqe reg_cqe;

73 struct nvme_rdma_queue *queue;

74 struct nvme_rdma_sgl data_sgl;

75 struct nvme_rdma_sgl *metadata_sgl;

76 bool use_sig_mr;

77 };

79 enum nvme_rdma_queue_flags {

80 NVME_RDMA_Q_ALLOCATED = 0,

81 NVME_RDMA_Q_LIVE = 1,

82 NVME_RDMA_Q_TR_READY = 2,

83 };

85 struct nvme_rdma_queue {

86 struct nvme_rdma_qe *rsp_ring;

87 int queue_size;

88 size_t cmnd_capsule_len;

89 struct nvme_rdma_ctrl *ctrl;

90 struct nvme_rdma_device *device;

91 struct ib_cq *ib_cq;

92 struct ib_qp *qp;

94 unsigned long flags;

95 struct rdma_cm_id *cm_id;

96 int cm_error;

97 struct completion cm_done;

98 bool pi_support;

99 int cq_size;

100 struct mutex queue_lock;

101 };

102

103 struct nvme_rdma_ctrl {

104 /* read only in the hot path */

105 struct nvme_rdma_queue *queues;

106

107 /* other member variables */

108 struct blk_mq_tag_set tag_set;

109 struct work_struct err_work;

110

111 struct nvme_rdma_qe async_event_sqe;

112

113 struct delayed_work reconnect_work;

114

115 struct list_head list;

116

117 struct blk_mq_tag_set admin_tag_set;

118 struct nvme_rdma_device *device;

119

120 u32 max_fr_pages;

121

122 struct sockaddr_storage addr;

123 struct sockaddr_storage src_addr;

124

125 struct nvme_ctrl ctrl;

126 bool use_inline_data;

127 u32 io_queues[HCTX_MAX_TYPES];

128 };

129

130 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)

131 {

132 return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);

133 }

134

135 static LIST_HEAD(device_list);

136 static DEFINE_MUTEX(device_list_mutex);

137

138 static LIST_HEAD(nvme_rdma_ctrl_list);

139 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);

140

141 /*

142 * Disabling this option makes small I/O goes faster, but is fundamentally

143 * unsafe. With it turned off we will have to register a global rkey that

144 * allows read and write access to all physical memory.

145 */

146 static bool register_always = true;

147 module_param(register_always, bool, 0444);

148 MODULE_PARM_DESC(register_always,

149 "Use memory registration even for contiguous memory regions");

150

151 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,

152 struct rdma_cm_event *event);

153 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);

154 static void nvme_rdma_complete_rq(struct request *rq);

155

156 static const struct blk_mq_ops nvme_rdma_mq_ops;

157 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;

158

159 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)

160 {

161 return queue - queue->ctrl->queues;

162 }

163

164 static bool nvme_rdma_poll_queue(struct nvme_rdma_queue *queue)

165 {

166 return nvme_rdma_queue_idx(queue) >

167 queue->ctrl->io_queues[HCTX_TYPE_DEFAULT] +

168 queue->ctrl->io_queues[HCTX_TYPE_READ];

169 }

170

171 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)

172 {

173 return queue->cmnd_capsule_len - sizeof(struct nvme_command);

174 }

175

176 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,

177 size_t capsule_size, enum dma_data_direction dir)

178 {

179 ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);

180 kfree(qe->data);

181 }

182

183 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,

184 size_t capsule_size, enum dma_data_direction dir)

185 {

186 qe->data = kzalloc(capsule_size, GFP_KERNEL);

187 if (!qe->data)

188 return -ENOMEM;

189

190 qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);

191 if (ib_dma_mapping_error(ibdev, qe->dma)) {

192 kfree(qe->data);

193 qe->data = NULL;

194 return -ENOMEM;

195 }

196

197 return 0;

198 }

199

200 static void nvme_rdma_free_ring(struct ib_device *ibdev,

201 struct nvme_rdma_qe *ring, size_t ib_queue_size,

202 size_t capsule_size, enum dma_data_direction dir)

203 {

204 int i;

205

206 for (i = 0; i < ib_queue_size; i++)

207 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);

208 kfree(ring);

209 }

210

211 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,

212 size_t ib_queue_size, size_t capsule_size,

213 enum dma_data_direction dir)

214 {

215 struct nvme_rdma_qe *ring;

216 int i;

217

218 ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);

219 if (!ring)

220 return NULL;

221

222 /*

223 * Bind the CQEs (post recv buffers) DMA mapping to the RDMA queue

224 * lifetime. It's safe, since any chage in the underlying RDMA device

225 * will issue error recovery and queue re-creation.

226 */

227 for (i = 0; i < ib_queue_size; i++) {

228 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))

229 goto out_free_ring;

230 }

231

232 return ring;

233

234 out_free_ring:

235 nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);

236 return NULL;

237 }

238

239 static void nvme_rdma_qp_event(struct ib_event *event, void *context)

240 {

241 pr_debug("QP event %s (%d)\n",

242 ib_event_msg(event->event), event->event);

243

244 }

245

246 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)

247 {

248 int ret;

249

250 ret = wait_for_completion_interruptible(&queue->cm_done);

251 if (ret)

252 return ret;

253 WARN_ON_ONCE(queue->cm_error > 0);

254 return queue->cm_error;

255 }

256

257 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)

258 {

259 struct nvme_rdma_device *dev = queue->device;

260 struct ib_qp_init_attr init_attr;

261 int ret;

262

263 memset(&init_attr, 0, sizeof(init_attr));

264 init_attr.event_handler = nvme_rdma_qp_event;

265 /* +1 for drain */

266 init_attr.cap.max_send_wr = factor * queue->queue_size + 1;

267 /* +1 for drain */

268 init_attr.cap.max_recv_wr = queue->queue_size + 1;

269 init_attr.cap.max_recv_sge = 1;

270 init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;

271 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;

272 init_attr.qp_type = IB_QPT_RC;

273 init_attr.send_cq = queue->ib_cq;

274 init_attr.recv_cq = queue->ib_cq;

275 if (queue->pi_support)

276 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;

277 init_attr.qp_context = queue;

278

279 ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);

280

281 queue->qp = queue->cm_id->qp;

282 return ret;

283 }

284

285 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,

286 struct request *rq, unsigned int hctx_idx)

287 {

288 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

289

290 kfree(req->sqe.data);

291 }

292

293 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,

294 struct request *rq, unsigned int hctx_idx,

295 unsigned int numa_node)

296 {

297 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(set->driver_data);

298 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

299 int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;

300 struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];

301

302 nvme_req(rq)->ctrl = &ctrl->ctrl;

303 req->sqe.data = kzalloc(sizeof(struct nvme_command), GFP_KERNEL);

304 if (!req->sqe.data)

305 return -ENOMEM;

306

307 /* metadata nvme_rdma_sgl struct is located after command's data SGL */

308 if (queue->pi_support)

309 req->metadata_sgl = (void *)nvme_req(rq) +

310 sizeof(struct nvme_rdma_request) +

311 NVME_RDMA_DATA_SGL_SIZE;

312

313 req->queue = queue;

314 nvme_req(rq)->cmd = req->sqe.data;

315

316 return 0;

317 }

318

319 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,

320 unsigned int hctx_idx)

321 {

322 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(data);

323 struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];

324

325 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);

326

327 hctx->driver_data = queue;

328 return 0;

329 }

330

331 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,

332 unsigned int hctx_idx)

333 {

334 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(data);

335 struct nvme_rdma_queue *queue = &ctrl->queues[0];

336

337 BUG_ON(hctx_idx != 0);

338

339 hctx->driver_data = queue;

340 return 0;

341 }

342

343 static void nvme_rdma_free_dev(struct kref *ref)

344 {

345 struct nvme_rdma_device *ndev =

346 container_of(ref, struct nvme_rdma_device, ref);

347

348 mutex_lock(&device_list_mutex);

349 list_del(&ndev->entry);

350 mutex_unlock(&device_list_mutex);

351

352 ib_dealloc_pd(ndev->pd);

353 kfree(ndev);

354 }

355

356 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)

357 {

358 kref_put(&dev->ref, nvme_rdma_free_dev);

359 }

360

361 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)

362 {

363 return kref_get_unless_zero(&dev->ref);

364 }

365

366 static struct nvme_rdma_device *

367 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)

368 {

369 struct nvme_rdma_device *ndev;

370

371 mutex_lock(&device_list_mutex);

372 list_for_each_entry(ndev, &device_list, entry) {

373 if (ndev->dev->node_guid == cm_id->device->node_guid &&

374 nvme_rdma_dev_get(ndev))

375 goto out_unlock;

376 }

377

378 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);

379 if (!ndev)

380 goto out_err;

381

382 ndev->dev = cm_id->device;

383 kref_init(&ndev->ref);

384

385 ndev->pd = ib_alloc_pd(ndev->dev,

386 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);

387 if (IS_ERR(ndev->pd))

388 goto out_free_dev;

389

390 if (!(ndev->dev->attrs.device_cap_flags &

391 IB_DEVICE_MEM_MGT_EXTENSIONS)) {

392 dev_err(&ndev->dev->dev,

393 "Memory registrations not supported.\n");

394 goto out_free_pd;

395 }

396

397 ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,

398 ndev->dev->attrs.max_send_sge - 1);

399 list_add(&ndev->entry, &device_list);

400 out_unlock:

401 mutex_unlock(&device_list_mutex);

402 return ndev;

403

404 out_free_pd:

405 ib_dealloc_pd(ndev->pd);

406 out_free_dev:

407 kfree(ndev);

408 out_err:

409 mutex_unlock(&device_list_mutex);

410 return NULL;

411 }

412

413 static void nvme_rdma_free_cq(struct nvme_rdma_queue *queue)

414 {

415 if (nvme_rdma_poll_queue(queue))

416 ib_free_cq(queue->ib_cq);

417 else

418 ib_cq_pool_put(queue->ib_cq, queue->cq_size);

419 }

420

421 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)

422 {

423 struct nvme_rdma_device *dev;

424 struct ib_device *ibdev;

425

426 if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))

427 return;

428

429 dev = queue->device;

430 ibdev = dev->dev;

431

432 if (queue->pi_support)

433 ib_mr_pool_destroy(queue->qp, &queue->qp->sig_mrs);

434 ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);

435

436 /*

437 * The cm_id object might have been destroyed during RDMA connection

438 * establishment error flow to avoid getting other cma events, thus

439 * the destruction of the QP shouldn't use rdma_cm API.

440 */

441 ib_destroy_qp(queue->qp);

442 nvme_rdma_free_cq(queue);

443

444 nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,

445 sizeof(struct nvme_completion), DMA_FROM_DEVICE);

446

447 nvme_rdma_dev_put(dev);

448 }

449

450 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev, bool pi_support)

451 {

452 u32 max_page_list_len;

453

454 if (pi_support)

455 max_page_list_len = ibdev->attrs.max_pi_fast_reg_page_list_len;

456 else

457 max_page_list_len = ibdev->attrs.max_fast_reg_page_list_len;

458

459 return min_t(u32, NVME_RDMA_MAX_SEGMENTS, max_page_list_len - 1);

460 }

461

462 static int nvme_rdma_create_cq(struct ib_device *ibdev,

463 struct nvme_rdma_queue *queue)

464 {

465 int ret, comp_vector, idx = nvme_rdma_queue_idx(queue);

466

467 /*

468 * Spread I/O queues completion vectors according their queue index.

469 * Admin queues can always go on completion vector 0.

470 */

471 comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors;

472

473 /* Polling queues need direct cq polling context */

474 if (nvme_rdma_poll_queue(queue))

475 queue->ib_cq = ib_alloc_cq(ibdev, queue, queue->cq_size,

476 comp_vector, IB_POLL_DIRECT);

477 else

478 queue->ib_cq = ib_cq_pool_get(ibdev, queue->cq_size,

479 comp_vector, IB_POLL_SOFTIRQ);

480

481 if (IS_ERR(queue->ib_cq)) {

482 ret = PTR_ERR(queue->ib_cq);

483 return ret;

484 }

485

486 return 0;

487 }

488

489 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)

490 {

491 struct ib_device *ibdev;

492 const int send_wr_factor = 3; /* MR, SEND, INV */

493 const int cq_factor = send_wr_factor + 1; /* + RECV */

494 int ret, pages_per_mr;

495

496 queue->device = nvme_rdma_find_get_device(queue->cm_id);

497 if (!queue->device) {

498 dev_err(queue->cm_id->device->dev.parent,

499 "no client data found!\n");

500 return -ECONNREFUSED;

501 }

502 ibdev = queue->device->dev;

503

504 /* +1 for ib_drain_qp */

505 queue->cq_size = cq_factor * queue->queue_size + 1;

506

507 ret = nvme_rdma_create_cq(ibdev, queue);

508 if (ret)

509 goto out_put_dev;

510

511 ret = nvme_rdma_create_qp(queue, send_wr_factor);

512 if (ret)

513 goto out_destroy_ib_cq;

514

515 queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,

516 sizeof(struct nvme_completion), DMA_FROM_DEVICE);

517 if (!queue->rsp_ring) {

518 ret = -ENOMEM;

519 goto out_destroy_qp;

520 }

521

522 /*

523 * Currently we don't use SG_GAPS MR's so if the first entry is

524 * misaligned we'll end up using two entries for a single data page,

525 * so one additional entry is required.

526 */

527 pages_per_mr = nvme_rdma_get_max_fr_pages(ibdev, queue->pi_support) + 1;

528 ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,

529 queue->queue_size,

530 IB_MR_TYPE_MEM_REG,

531 pages_per_mr, 0);

532 if (ret) {

533 dev_err(queue->ctrl->ctrl.device,

534 "failed to initialize MR pool sized %d for QID %d\n",

535 queue->queue_size, nvme_rdma_queue_idx(queue));

536 goto out_destroy_ring;

537 }

538

539 if (queue->pi_support) {

540 ret = ib_mr_pool_init(queue->qp, &queue->qp->sig_mrs,

541 queue->queue_size, IB_MR_TYPE_INTEGRITY,

542 pages_per_mr, pages_per_mr);

543 if (ret) {

544 dev_err(queue->ctrl->ctrl.device,

545 "failed to initialize PI MR pool sized %d for QID %d\n",

546 queue->queue_size, nvme_rdma_queue_idx(queue));

547 goto out_destroy_mr_pool;

548 }

549 }

550

551 set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);

552

553 return 0;

554

555 out_destroy_mr_pool:

556 ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);

557 out_destroy_ring:

558 nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,

559 sizeof(struct nvme_completion), DMA_FROM_DEVICE);

560 out_destroy_qp:

561 rdma_destroy_qp(queue->cm_id);

562 out_destroy_ib_cq:

563 nvme_rdma_free_cq(queue);

564 out_put_dev:

565 nvme_rdma_dev_put(queue->device);

566 return ret;

567 }

568

569 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,

570 int idx, size_t queue_size)

571 {

572 struct nvme_rdma_queue *queue;

573 struct sockaddr *src_addr = NULL;

574 int ret;

575

576 queue = &ctrl->queues[idx];

577 mutex_init(&queue->queue_lock);

578 queue->ctrl = ctrl;

579 if (idx && ctrl->ctrl.max_integrity_segments)

580 queue->pi_support = true;

581 else

582 queue->pi_support = false;

583 init_completion(&queue->cm_done);

584

585 if (idx > 0)

586 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;

587 else

588 queue->cmnd_capsule_len = sizeof(struct nvme_command);

589

590 queue->queue_size = queue_size;

591

592 queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,

593 RDMA_PS_TCP, IB_QPT_RC);

594 if (IS_ERR(queue->cm_id)) {

595 dev_info(ctrl->ctrl.device,

596 "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));

597 ret = PTR_ERR(queue->cm_id);

598 goto out_destroy_mutex;

599 }

600

601 if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)

602 src_addr = (struct sockaddr *)&ctrl->src_addr;

603

604 queue->cm_error = -ETIMEDOUT;

605 ret = rdma_resolve_addr(queue->cm_id, src_addr,

606 (struct sockaddr *)&ctrl->addr,

607 NVME_RDMA_CM_TIMEOUT_MS);

608 if (ret) {

609 dev_info(ctrl->ctrl.device,

610 "rdma_resolve_addr failed (%d).\n", ret);

611 goto out_destroy_cm_id;

612 }

613

614 ret = nvme_rdma_wait_for_cm(queue);

615 if (ret) {

616 dev_info(ctrl->ctrl.device,

617 "rdma connection establishment failed (%d)\n", ret);

618 goto out_destroy_cm_id;

619 }

620

621 set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);

622

623 return 0;

624

625 out_destroy_cm_id:

626 rdma_destroy_id(queue->cm_id);

627 nvme_rdma_destroy_queue_ib(queue);

628 out_destroy_mutex:

629 mutex_destroy(&queue->queue_lock);

630 return ret;

631 }

632

633 static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)

634 {

635 rdma_disconnect(queue->cm_id);

636 ib_drain_qp(queue->qp);

637 }

638

639 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)

640 {

641 if (!test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))

642 return;

643

644 mutex_lock(&queue->queue_lock);

645 if (test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))

646 __nvme_rdma_stop_queue(queue);

647 mutex_unlock(&queue->queue_lock);

648 }

649

650 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)

651 {

652 if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))

653 return;

654

655 rdma_destroy_id(queue->cm_id);

656 nvme_rdma_destroy_queue_ib(queue);

657 mutex_destroy(&queue->queue_lock);

658 }

659

660 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)

661 {

662 int i;

663

664 for (i = 1; i < ctrl->ctrl.queue_count; i++)

665 nvme_rdma_free_queue(&ctrl->queues[i]);

666 }

667

668 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)

669 {

670 int i;

671

672 for (i = 1; i < ctrl->ctrl.queue_count; i++)

673 nvme_rdma_stop_queue(&ctrl->queues[i]);

674 }

675

676 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)

677 {

678 struct nvme_rdma_queue *queue = &ctrl->queues[idx];

679 int ret;

680

681 if (idx)

682 ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);

683 else

684 ret = nvmf_connect_admin_queue(&ctrl->ctrl);

685

686 if (!ret) {

687 set_bit(NVME_RDMA_Q_LIVE, &queue->flags);

688 } else {

689 if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))

690 __nvme_rdma_stop_queue(queue);

691 dev_info(ctrl->ctrl.device,

692 "failed to connect queue: %d ret=%d\n", idx, ret);

693 }

694 return ret;

695 }

696

697 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl,

698 int first, int last)

699 {

700 int i, ret = 0;

701

702 for (i = first; i < last; i++) {

703 ret = nvme_rdma_start_queue(ctrl, i);

704 if (ret)

705 goto out_stop_queues;

706 }

707

708 return 0;

709

710 out_stop_queues:

711 for (i--; i >= first; i--)

712 nvme_rdma_stop_queue(&ctrl->queues[i]);

713 return ret;

714 }

715

716 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)

717 {

718 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;

719 unsigned int nr_io_queues;

720 int i, ret;

721

722 nr_io_queues = nvmf_nr_io_queues(opts);

723 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);

724 if (ret)

725 return ret;

726

727 if (nr_io_queues == 0) {

728 dev_err(ctrl->ctrl.device,

729 "unable to set any I/O queues\n");

730 return -ENOMEM;

731 }

732

733 ctrl->ctrl.queue_count = nr_io_queues + 1;

734 dev_info(ctrl->ctrl.device,

735 "creating %d I/O queues.\n", nr_io_queues);

736

737 nvmf_set_io_queues(opts, nr_io_queues, ctrl->io_queues);

738 for (i = 1; i < ctrl->ctrl.queue_count; i++) {

739 ret = nvme_rdma_alloc_queue(ctrl, i,

740 ctrl->ctrl.sqsize + 1);

741 if (ret)

742 goto out_free_queues;

743 }

744

745 return 0;

746

747 out_free_queues:

748 for (i--; i >= 1; i--)

749 nvme_rdma_free_queue(&ctrl->queues[i]);

750

751 return ret;

752 }

753

754 static int nvme_rdma_alloc_tag_set(struct nvme_ctrl *ctrl)

755 {

756 unsigned int cmd_size = sizeof(struct nvme_rdma_request) +

757 NVME_RDMA_DATA_SGL_SIZE;

758

759 if (ctrl->max_integrity_segments)

760 cmd_size += sizeof(struct nvme_rdma_sgl) +

761 NVME_RDMA_METADATA_SGL_SIZE;

762

763 return nvme_alloc_io_tag_set(ctrl, &to_rdma_ctrl(ctrl)->tag_set,

764 &nvme_rdma_mq_ops,

765 ctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2,

766 cmd_size);

767 }

768

769 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl)

770 {

771 if (ctrl->async_event_sqe.data) {

772 cancel_work_sync(&ctrl->ctrl.async_event_work);

773 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,

774 sizeof(struct nvme_command), DMA_TO_DEVICE);

775 ctrl->async_event_sqe.data = NULL;

776 }

777 nvme_rdma_free_queue(&ctrl->queues[0]);

778 }

779

780 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,

781 bool new)

782 {

783 bool pi_capable = false;

784 int error;

785

786 error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);

787 if (error)

788 return error;

789

790 ctrl->device = ctrl->queues[0].device;

791 ctrl->ctrl.numa_node = ibdev_to_node(ctrl->device->dev);

792

793 /* T10-PI support */

794 if (ctrl->device->dev->attrs.kernel_cap_flags &

795 IBK_INTEGRITY_HANDOVER)

796 pi_capable = true;

797

798 ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev,

799 pi_capable);

800

801 /*

802 * Bind the async event SQE DMA mapping to the admin queue lifetime.

803 * It's safe, since any chage in the underlying RDMA device will issue

804 * error recovery and queue re-creation.

805 */

806 error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,

807 sizeof(struct nvme_command), DMA_TO_DEVICE);

808 if (error)

809 goto out_free_queue;

810

811 if (new) {

812 error = nvme_alloc_admin_tag_set(&ctrl->ctrl,

813 &ctrl->admin_tag_set, &nvme_rdma_admin_mq_ops,

814 sizeof(struct nvme_rdma_request) +

815 NVME_RDMA_DATA_SGL_SIZE);

816 if (error)

817 goto out_free_async_qe;

818

819 }

820

821 error = nvme_rdma_start_queue(ctrl, 0);

822 if (error)

823 goto out_remove_admin_tag_set;

824

825 error = nvme_enable_ctrl(&ctrl->ctrl);

826 if (error)

827 goto out_stop_queue;

828

829 ctrl->ctrl.max_segments = ctrl->max_fr_pages;

830 ctrl->ctrl.max_hw_sectors = ctrl->max_fr_pages << (ilog2(SZ_4K) - 9);

831 if (pi_capable)

832 ctrl->ctrl.max_integrity_segments = ctrl->max_fr_pages;

833 else

834 ctrl->ctrl.max_integrity_segments = 0;

835

836 nvme_unquiesce_admin_queue(&ctrl->ctrl);

837

838 error = nvme_init_ctrl_finish(&ctrl->ctrl, false);

839 if (error)

840 goto out_quiesce_queue;

841

842 return 0;

843

844 out_quiesce_queue:

845 nvme_quiesce_admin_queue(&ctrl->ctrl);

846 blk_sync_queue(ctrl->ctrl.admin_q);

847 out_stop_queue:

848 nvme_rdma_stop_queue(&ctrl->queues[0]);

849 nvme_cancel_admin_tagset(&ctrl->ctrl);

850 out_remove_admin_tag_set:

851 if (new)

852 nvme_remove_admin_tag_set(&ctrl->ctrl);

853 out_free_async_qe:

854 if (ctrl->async_event_sqe.data) {

855 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,

856 sizeof(struct nvme_command), DMA_TO_DEVICE);

857 ctrl->async_event_sqe.data = NULL;

858 }

859 out_free_queue:

860 nvme_rdma_free_queue(&ctrl->queues[0]);

861 return error;

862 }

863

864 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)

865 {

866 int ret, nr_queues;

867

868 ret = nvme_rdma_alloc_io_queues(ctrl);

869 if (ret)

870 return ret;

871

872 if (new) {

873 ret = nvme_rdma_alloc_tag_set(&ctrl->ctrl);

874 if (ret)

875 goto out_free_io_queues;

876 }

877

878 /*

879 * Only start IO queues for which we have allocated the tagset

880 * and limitted it to the available queues. On reconnects, the

881 * queue number might have changed.

882 */

883 nr_queues = min(ctrl->tag_set.nr_hw_queues + 1, ctrl->ctrl.queue_count);

884 ret = nvme_rdma_start_io_queues(ctrl, 1, nr_queues);

885 if (ret)

886 goto out_cleanup_tagset;

887

888 if (!new) {

889 nvme_start_freeze(&ctrl->ctrl);

890 nvme_unquiesce_io_queues(&ctrl->ctrl);

891 if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {

892 /*

893 * If we timed out waiting for freeze we are likely to

894 * be stuck. Fail the controller initialization just

895 * to be safe.

896 */

897 ret = -ENODEV;

898 nvme_unfreeze(&ctrl->ctrl);

899 goto out_wait_freeze_timed_out;

900 }

901 blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset,

902 ctrl->ctrl.queue_count - 1);

903 nvme_unfreeze(&ctrl->ctrl);

904 }

905

906 /*

907 * If the number of queues has increased (reconnect case)

908 * start all new queues now.

909 */

910 ret = nvme_rdma_start_io_queues(ctrl, nr_queues,

911 ctrl->tag_set.nr_hw_queues + 1);

912 if (ret)

913 goto out_wait_freeze_timed_out;

914

915 return 0;

916

917 out_wait_freeze_timed_out:

918 nvme_quiesce_io_queues(&ctrl->ctrl);

919 nvme_sync_io_queues(&ctrl->ctrl);

920 nvme_rdma_stop_io_queues(ctrl);

921 out_cleanup_tagset:

922 nvme_cancel_tagset(&ctrl->ctrl);

923 if (new)

924 nvme_remove_io_tag_set(&ctrl->ctrl);

925 out_free_io_queues:

926 nvme_rdma_free_io_queues(ctrl);

927 return ret;

928 }

929

930 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,

931 bool remove)

932 {

933 nvme_quiesce_admin_queue(&ctrl->ctrl);

934 blk_sync_queue(ctrl->ctrl.admin_q);

935 nvme_rdma_stop_queue(&ctrl->queues[0]);

936 nvme_cancel_admin_tagset(&ctrl->ctrl);

937 if (remove) {

938 nvme_unquiesce_admin_queue(&ctrl->ctrl);

939 nvme_remove_admin_tag_set(&ctrl->ctrl);

940 }

941 nvme_rdma_destroy_admin_queue(ctrl);

942 }

943

944 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,

945 bool remove)

946 {

947 if (ctrl->ctrl.queue_count > 1) {

948 nvme_quiesce_io_queues(&ctrl->ctrl);

949 nvme_sync_io_queues(&ctrl->ctrl);

950 nvme_rdma_stop_io_queues(ctrl);

951 nvme_cancel_tagset(&ctrl->ctrl);

952 if (remove) {

953 nvme_unquiesce_io_queues(&ctrl->ctrl);

954 nvme_remove_io_tag_set(&ctrl->ctrl);

955 }

956 nvme_rdma_free_io_queues(ctrl);

957 }

958 }

959

960 static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)

961 {

962 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);

963

964 flush_work(&ctrl->err_work);

965 cancel_delayed_work_sync(&ctrl->reconnect_work);

966 }

967

968 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)

969 {

970 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);

971

972 if (list_empty(&ctrl->list))

973 goto free_ctrl;

974

975 mutex_lock(&nvme_rdma_ctrl_mutex);

976 list_del(&ctrl->list);

977 mutex_unlock(&nvme_rdma_ctrl_mutex);

978

979 nvmf_free_options(nctrl->opts);

980 free_ctrl:

981 kfree(ctrl->queues);

982 kfree(ctrl);

983 }

984

985 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl,

986 int status)

987 {

988 enum nvme_ctrl_state state = nvme_ctrl_state(&ctrl->ctrl);

989

990 /* If we are resetting/deleting then do nothing */

991 if (state != NVME_CTRL_CONNECTING) {

992 WARN_ON_ONCE(state == NVME_CTRL_NEW || state == NVME_CTRL_LIVE);

993 return;

994 }

995

996 if (nvmf_should_reconnect(&ctrl->ctrl, status)) {

997 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",

998 ctrl->ctrl.opts->reconnect_delay);

999 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,

1000 ctrl->ctrl.opts->reconnect_delay * HZ);

1001 } else {

1002 nvme_delete_ctrl(&ctrl->ctrl);

1003 }

1004 }

1005

1006 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)

1007 {

1008 int ret;

1009 bool changed;

1010 u16 max_queue_size;

1011

1012 ret = nvme_rdma_configure_admin_queue(ctrl, new);

1013 if (ret)

1014 return ret;

1015

1016 if (ctrl->ctrl.icdoff) {

1017 ret = -EOPNOTSUPP;

1018 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");

1019 goto destroy_admin;

1020 }

1021

1022 if (!(ctrl->ctrl.sgls & NVME_CTRL_SGLS_KSDBDS)) {

1023 ret = -EOPNOTSUPP;

1024 dev_err(ctrl->ctrl.device,

1025 "Mandatory keyed sgls are not supported!\n");

1026 goto destroy_admin;

1027 }

1028

1029 if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {

1030 dev_warn(ctrl->ctrl.device,

1031 "queue_size %zu > ctrl sqsize %u, clamping down\n",

1032 ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);

1033 }

1034

1035 if (ctrl->ctrl.max_integrity_segments)

1036 max_queue_size = NVME_RDMA_MAX_METADATA_QUEUE_SIZE;

1037 else

1038 max_queue_size = NVME_RDMA_MAX_QUEUE_SIZE;

1039

1040 if (ctrl->ctrl.sqsize + 1 > max_queue_size) {

1041 dev_warn(ctrl->ctrl.device,

1042 "ctrl sqsize %u > max queue size %u, clamping down\n",

1043 ctrl->ctrl.sqsize + 1, max_queue_size);

1044 ctrl->ctrl.sqsize = max_queue_size - 1;

1045 }

1046

1047 if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {

1048 dev_warn(ctrl->ctrl.device,

1049 "sqsize %u > ctrl maxcmd %u, clamping down\n",

1050 ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);

1051 ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;

1052 }

1053

1054 if (ctrl->ctrl.sgls & NVME_CTRL_SGLS_SAOS)

1055 ctrl->use_inline_data = true;

1056

1057 if (ctrl->ctrl.queue_count > 1) {

1058 ret = nvme_rdma_configure_io_queues(ctrl, new);

1059 if (ret)

1060 goto destroy_admin;

1061 }

1062

1063 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);

1064 if (!changed) {

1065 /*

1066 * state change failure is ok if we started ctrl delete,

1067 * unless we're during creation of a new controller to

1068 * avoid races with teardown flow.

1069 */

1070 enum nvme_ctrl_state state = nvme_ctrl_state(&ctrl->ctrl);

1071

1072 WARN_ON_ONCE(state != NVME_CTRL_DELETING &&

1073 state != NVME_CTRL_DELETING_NOIO);

1074 WARN_ON_ONCE(new);

1075 ret = -EINVAL;

1076 goto destroy_io;

1077 }

1078

1079 nvme_start_ctrl(&ctrl->ctrl);

1080 return 0;

1081

1082 destroy_io:

1083 if (ctrl->ctrl.queue_count > 1) {

1084 nvme_quiesce_io_queues(&ctrl->ctrl);

1085 nvme_sync_io_queues(&ctrl->ctrl);

1086 nvme_rdma_stop_io_queues(ctrl);

1087 nvme_cancel_tagset(&ctrl->ctrl);

1088 if (new)

1089 nvme_remove_io_tag_set(&ctrl->ctrl);

1090 nvme_rdma_free_io_queues(ctrl);

1091 }

1092 destroy_admin:

1093 nvme_stop_keep_alive(&ctrl->ctrl);

1094 nvme_rdma_teardown_admin_queue(ctrl, new);

1095 return ret;

1096 }

1097

1098 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)

1099 {

1100 struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),

1101 struct nvme_rdma_ctrl, reconnect_work);

1102 int ret;

1103

1104 ++ctrl->ctrl.nr_reconnects;

1105

1106 ret = nvme_rdma_setup_ctrl(ctrl, false);

1107 if (ret)

1108 goto requeue;

1109

1110 dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",

1111 ctrl->ctrl.nr_reconnects);

1112

1113 ctrl->ctrl.nr_reconnects = 0;

1114

1115 return;

1116

1117 requeue:

1118 dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d/%d\n",

1119 ctrl->ctrl.nr_reconnects, ctrl->ctrl.opts->max_reconnects);

1120 nvme_rdma_reconnect_or_remove(ctrl, ret);

1121 }

1122

1123 static void nvme_rdma_error_recovery_work(struct work_struct *work)

1124 {

1125 struct nvme_rdma_ctrl *ctrl = container_of(work,

1126 struct nvme_rdma_ctrl, err_work);

1127

1128 nvme_stop_keep_alive(&ctrl->ctrl);

1129 flush_work(&ctrl->ctrl.async_event_work);

1130 nvme_rdma_teardown_io_queues(ctrl, false);

1131 nvme_unquiesce_io_queues(&ctrl->ctrl);

1132 nvme_rdma_teardown_admin_queue(ctrl, false);

1133 nvme_unquiesce_admin_queue(&ctrl->ctrl);

1134 nvme_auth_stop(&ctrl->ctrl);

1135

1136 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {

1137 /* state change failure is ok if we started ctrl delete */

1138 enum nvme_ctrl_state state = nvme_ctrl_state(&ctrl->ctrl);

1139

1140 WARN_ON_ONCE(state != NVME_CTRL_DELETING &&

1141 state != NVME_CTRL_DELETING_NOIO);

1142 return;

1143 }

1144

1145 nvme_rdma_reconnect_or_remove(ctrl, 0);

1146 }

1147

1148 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)

1149 {

1150 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))

1151 return;

1152

1153 dev_warn(ctrl->ctrl.device, "starting error recovery\n");

1154 queue_work(nvme_reset_wq, &ctrl->err_work);

1155 }

1156

1157 static void nvme_rdma_end_request(struct nvme_rdma_request *req)

1158 {

1159 struct request *rq = blk_mq_rq_from_pdu(req);

1160

1161 if (!refcount_dec_and_test(&req->ref))

1162 return;

1163 if (!nvme_try_complete_req(rq, req->status, req->result))

1164 nvme_rdma_complete_rq(rq);

1165 }

1166

1167 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,

1168 const char *op)

1169 {

1170 struct nvme_rdma_queue *queue = wc->qp->qp_context;

1171 struct nvme_rdma_ctrl *ctrl = queue->ctrl;

1172

1173 if (nvme_ctrl_state(&ctrl->ctrl) == NVME_CTRL_LIVE)

1174 dev_info(ctrl->ctrl.device,

1175 "%s for CQE 0x%p failed with status %s (%d)\n",

1176 op, wc->wr_cqe,

1177 ib_wc_status_msg(wc->status), wc->status);

1178 nvme_rdma_error_recovery(ctrl);

1179 }

1180

1181 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)

1182 {

1183 if (unlikely(wc->status != IB_WC_SUCCESS))

1184 nvme_rdma_wr_error(cq, wc, "MEMREG");

1185 }

1186

1187 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)

1188 {

1189 struct nvme_rdma_request *req =

1190 container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);

1191

1192 if (unlikely(wc->status != IB_WC_SUCCESS))

1193 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");

1194 else

1195 nvme_rdma_end_request(req);

1196 }

1197

1198 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,

1199 struct nvme_rdma_request *req)

1200 {

1201 struct ib_send_wr wr = {

1202 .opcode = IB_WR_LOCAL_INV,

1203 .next = NULL,

1204 .num_sge = 0,

1205 .send_flags = IB_SEND_SIGNALED,

1206 .ex.invalidate_rkey = req->mr->rkey,

1207 };

1208

1209 req->reg_cqe.done = nvme_rdma_inv_rkey_done;

1210 wr.wr_cqe = &req->reg_cqe;

1211

1212 return ib_post_send(queue->qp, &wr, NULL);

1213 }

1214

1215 static void nvme_rdma_dma_unmap_req(struct ib_device *ibdev, struct request *rq)

1216 {

1217 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1218

1219 if (blk_integrity_rq(rq)) {

1220 ib_dma_unmap_sg(ibdev, req->metadata_sgl->sg_table.sgl,

1221 req->metadata_sgl->nents, rq_dma_dir(rq));

1222 sg_free_table_chained(&req->metadata_sgl->sg_table,

1223 NVME_INLINE_METADATA_SG_CNT);

1224 }

1225

1226 ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,

1227 rq_dma_dir(rq));

1228 sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);

1229 }

1230

1231 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,

1232 struct request *rq)

1233 {

1234 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1235 struct nvme_rdma_device *dev = queue->device;

1236 struct ib_device *ibdev = dev->dev;

1237 struct list_head *pool = &queue->qp->rdma_mrs;

1238

1239 if (!blk_rq_nr_phys_segments(rq))

1240 return;

1241

1242 if (req->use_sig_mr)

1243 pool = &queue->qp->sig_mrs;

1244

1245 if (req->mr) {

1246 ib_mr_pool_put(queue->qp, pool, req->mr);

1247 req->mr = NULL;

1248 }

1249

1250 nvme_rdma_dma_unmap_req(ibdev, rq);

1251 }

1252

1253 static int nvme_rdma_set_sg_null(struct nvme_command *c)

1254 {

1255 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

1256

1257 sg->addr = 0;

1258 put_unaligned_le24(0, sg->length);

1259 put_unaligned_le32(0, sg->key);

1260 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;

1261 return 0;

1262 }

1263

1264 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,

1265 struct nvme_rdma_request *req, struct nvme_command *c,

1266 int count)

1267 {

1268 struct nvme_sgl_desc *sg = &c->common.dptr.sgl;

1269 struct ib_sge *sge = &req->sge[1];

1270 struct scatterlist *sgl;

1271 u32 len = 0;

1272 int i;

1273

1274 for_each_sg(req->data_sgl.sg_table.sgl, sgl, count, i) {

1275 sge->addr = sg_dma_address(sgl);

1276 sge->length = sg_dma_len(sgl);

1277 sge->lkey = queue->device->pd->local_dma_lkey;

1278 len += sge->length;

1279 sge++;

1280 }

1281

1282 sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);

1283 sg->length = cpu_to_le32(len);

1284 sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;

1285

1286 req->num_sge += count;

1287 return 0;

1288 }

1289

1290 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,

1291 struct nvme_rdma_request *req, struct nvme_command *c)

1292 {

1293 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

1294

1295 sg->addr = cpu_to_le64(sg_dma_address(req->data_sgl.sg_table.sgl));

1296 put_unaligned_le24(sg_dma_len(req->data_sgl.sg_table.sgl), sg->length);

1297 put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);

1298 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;

1299 return 0;

1300 }

1301

1302 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,

1303 struct nvme_rdma_request *req, struct nvme_command *c,

1304 int count)

1305 {

1306 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

1307 int nr;

1308

1309 req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);

1310 if (WARN_ON_ONCE(!req->mr))

1311 return -EAGAIN;

1312

1313 /*

1314 * Align the MR to a 4K page size to match the ctrl page size and

1315 * the block virtual boundary.

1316 */

1317 nr = ib_map_mr_sg(req->mr, req->data_sgl.sg_table.sgl, count, NULL,

1318 SZ_4K);

1319 if (unlikely(nr < count)) {

1320 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);

1321 req->mr = NULL;

1322 if (nr < 0)

1323 return nr;

1324 return -EINVAL;

1325 }

1326

1327 ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));

1328

1329 req->reg_cqe.done = nvme_rdma_memreg_done;

1330 memset(&req->reg_wr, 0, sizeof(req->reg_wr));

1331 req->reg_wr.wr.opcode = IB_WR_REG_MR;

1332 req->reg_wr.wr.wr_cqe = &req->reg_cqe;

1333 req->reg_wr.wr.num_sge = 0;

1334 req->reg_wr.mr = req->mr;

1335 req->reg_wr.key = req->mr->rkey;

1336 req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |

1337 IB_ACCESS_REMOTE_READ |

1338 IB_ACCESS_REMOTE_WRITE;

1339

1340 sg->addr = cpu_to_le64(req->mr->iova);

1341 put_unaligned_le24(req->mr->length, sg->length);

1342 put_unaligned_le32(req->mr->rkey, sg->key);

1343 sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |

1344 NVME_SGL_FMT_INVALIDATE;

1345

1346 return 0;

1347 }

1348

1349 static void nvme_rdma_set_sig_domain(struct blk_integrity *bi,

1350 struct nvme_command *cmd, struct ib_sig_domain *domain,

1351 u16 control, u8 pi_type)

1352 {

1353 domain->sig_type = IB_SIG_TYPE_T10_DIF;

1354 domain->sig.dif.bg_type = IB_T10DIF_CRC;

1355 domain->sig.dif.pi_interval = 1 << bi->interval_exp;

1356 domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);

1357 if (control & NVME_RW_PRINFO_PRCHK_REF)

1358 domain->sig.dif.ref_remap = true;

1359

1360 domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.lbat);

1361 domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.lbatm);

1362 domain->sig.dif.app_escape = true;

1363 if (pi_type == NVME_NS_DPS_PI_TYPE3)

1364 domain->sig.dif.ref_escape = true;

1365 }

1366

1367 static void nvme_rdma_set_sig_attrs(struct blk_integrity *bi,

1368 struct nvme_command *cmd, struct ib_sig_attrs *sig_attrs,

1369 u8 pi_type)

1370 {

1371 u16 control = le16_to_cpu(cmd->rw.control);

1372

1373 memset(sig_attrs, 0, sizeof(*sig_attrs));

1374 if (control & NVME_RW_PRINFO_PRACT) {

1375 /* for WRITE_INSERT/READ_STRIP no memory domain */

1376 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;

1377 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,

1378 pi_type);

1379 /* Clear the PRACT bit since HCA will generate/verify the PI */

1380 control &= ~NVME_RW_PRINFO_PRACT;

1381 cmd->rw.control = cpu_to_le16(control);

1382 } else {

1383 /* for WRITE_PASS/READ_PASS both wire/memory domains exist */

1384 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,

1385 pi_type);

1386 nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,

1387 pi_type);

1388 }

1389 }

1390

1391 static void nvme_rdma_set_prot_checks(struct nvme_command *cmd, u8 *mask)

1392 {

1393 *mask = 0;

1394 if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_REF)

1395 *mask |= IB_SIG_CHECK_REFTAG;

1396 if (le16_to_cpu(cmd->rw.control) & NVME_RW_PRINFO_PRCHK_GUARD)

1397 *mask |= IB_SIG_CHECK_GUARD;

1398 }

1399

1400 static void nvme_rdma_sig_done(struct ib_cq *cq, struct ib_wc *wc)

1401 {

1402 if (unlikely(wc->status != IB_WC_SUCCESS))

1403 nvme_rdma_wr_error(cq, wc, "SIG");

1404 }

1405

1406 static int nvme_rdma_map_sg_pi(struct nvme_rdma_queue *queue,

1407 struct nvme_rdma_request *req, struct nvme_command *c,

1408 int count, int pi_count)

1409 {

1410 struct nvme_rdma_sgl *sgl = &req->data_sgl;

1411 struct ib_reg_wr *wr = &req->reg_wr;

1412 struct request *rq = blk_mq_rq_from_pdu(req);

1413 struct nvme_ns *ns = rq->q->queuedata;

1414 struct bio *bio = rq->bio;

1415 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;

1416 struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);

1417 u32 xfer_len;

1418 int nr;

1419

1420 req->mr = ib_mr_pool_get(queue->qp, &queue->qp->sig_mrs);

1421 if (WARN_ON_ONCE(!req->mr))

1422 return -EAGAIN;

1423

1424 nr = ib_map_mr_sg_pi(req->mr, sgl->sg_table.sgl, count, NULL,

1425 req->metadata_sgl->sg_table.sgl, pi_count, NULL,

1426 SZ_4K);

1427 if (unlikely(nr))

1428 goto mr_put;

1429

1430 nvme_rdma_set_sig_attrs(bi, c, req->mr->sig_attrs, ns->head->pi_type);

1431 nvme_rdma_set_prot_checks(c, &req->mr->sig_attrs->check_mask);

1432

1433 ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));

1434

1435 req->reg_cqe.done = nvme_rdma_sig_done;

1436 memset(wr, 0, sizeof(*wr));

1437 wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;

1438 wr->wr.wr_cqe = &req->reg_cqe;

1439 wr->wr.num_sge = 0;

1440 wr->wr.send_flags = 0;

1441 wr->mr = req->mr;

1442 wr->key = req->mr->rkey;

1443 wr->access = IB_ACCESS_LOCAL_WRITE |

1444 IB_ACCESS_REMOTE_READ |

1445 IB_ACCESS_REMOTE_WRITE;

1446

1447 sg->addr = cpu_to_le64(req->mr->iova);

1448 xfer_len = req->mr->length;

1449 /* Check if PI is added by the HW */

1450 if (!pi_count)

1451 xfer_len += (xfer_len >> bi->interval_exp) * ns->head->pi_size;

1452 put_unaligned_le24(xfer_len, sg->length);

1453 put_unaligned_le32(req->mr->rkey, sg->key);

1454 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;

1455

1456 return 0;

1457

1458 mr_put:

1459 ib_mr_pool_put(queue->qp, &queue->qp->sig_mrs, req->mr);

1460 req->mr = NULL;

1461 if (nr < 0)

1462 return nr;

1463 return -EINVAL;

1464 }

1465

1466 static int nvme_rdma_dma_map_req(struct ib_device *ibdev, struct request *rq,

1467 int *count, int *pi_count)

1468 {

1469 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1470 int ret;

1471

1472 req->data_sgl.sg_table.sgl = (struct scatterlist *)(req + 1);

1473 ret = sg_alloc_table_chained(&req->data_sgl.sg_table,

1474 blk_rq_nr_phys_segments(rq), req->data_sgl.sg_table.sgl,

1475 NVME_INLINE_SG_CNT);

1476 if (ret)

1477 return -ENOMEM;

1478

1479 req->data_sgl.nents = blk_rq_map_sg(rq->q, rq,

1480 req->data_sgl.sg_table.sgl);

1481

1482 *count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,

1483 req->data_sgl.nents, rq_dma_dir(rq));

1484 if (unlikely(*count <= 0)) {

1485 ret = -EIO;

1486 goto out_free_table;

1487 }

1488

1489 if (blk_integrity_rq(rq)) {

1490 req->metadata_sgl->sg_table.sgl =

1491 (struct scatterlist *)(req->metadata_sgl + 1);

1492 ret = sg_alloc_table_chained(&req->metadata_sgl->sg_table,

1493 rq->nr_integrity_segments,

1494 req->metadata_sgl->sg_table.sgl,

1495 NVME_INLINE_METADATA_SG_CNT);

1496 if (unlikely(ret)) {

1497 ret = -ENOMEM;

1498 goto out_unmap_sg;

1499 }

1500

1501 req->metadata_sgl->nents = blk_rq_map_integrity_sg(rq,

1502 req->metadata_sgl->sg_table.sgl);

1503 *pi_count = ib_dma_map_sg(ibdev,

1504 req->metadata_sgl->sg_table.sgl,

1505 req->metadata_sgl->nents,

1506 rq_dma_dir(rq));

1507 if (unlikely(*pi_count <= 0)) {

1508 ret = -EIO;

1509 goto out_free_pi_table;

1510 }

1511 }

1512

1513 return 0;

1514

1515 out_free_pi_table:

1516 sg_free_table_chained(&req->metadata_sgl->sg_table,

1517 NVME_INLINE_METADATA_SG_CNT);

1518 out_unmap_sg:

1519 ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,

1520 rq_dma_dir(rq));

1521 out_free_table:

1522 sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);

1523 return ret;

1524 }

1525

1526 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,

1527 struct request *rq, struct nvme_command *c)

1528 {

1529 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1530 struct nvme_rdma_device *dev = queue->device;

1531 struct ib_device *ibdev = dev->dev;

1532 int pi_count = 0;

1533 int count, ret;

1534

1535 req->num_sge = 1;

1536 refcount_set(&req->ref, 2); /* send and recv completions */

1537

1538 c->common.flags |= NVME_CMD_SGL_METABUF;

1539

1540 if (!blk_rq_nr_phys_segments(rq))

1541 return nvme_rdma_set_sg_null(c);

1542

1543 ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count);

1544 if (unlikely(ret))

1545 return ret;

1546

1547 if (req->use_sig_mr) {

1548 ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count);

1549 goto out;

1550 }

1551

1552 if (count <= dev->num_inline_segments) {

1553 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&

1554 queue->ctrl->use_inline_data &&

1555 blk_rq_payload_bytes(rq) <=

1556 nvme_rdma_inline_data_size(queue)) {

1557 ret = nvme_rdma_map_sg_inline(queue, req, c, count);

1558 goto out;

1559 }

1560

1561 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {

1562 ret = nvme_rdma_map_sg_single(queue, req, c);

1563 goto out;

1564 }

1565 }

1566

1567 ret = nvme_rdma_map_sg_fr(queue, req, c, count);

1568 out:

1569 if (unlikely(ret))

1570 goto out_dma_unmap_req;

1571

1572 return 0;

1573

1574 out_dma_unmap_req:

1575 nvme_rdma_dma_unmap_req(ibdev, rq);

1576 return ret;

1577 }

1578

1579 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)

1580 {

1581 struct nvme_rdma_qe *qe =

1582 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);

1583 struct nvme_rdma_request *req =

1584 container_of(qe, struct nvme_rdma_request, sqe);

1585

1586 if (unlikely(wc->status != IB_WC_SUCCESS))

1587 nvme_rdma_wr_error(cq, wc, "SEND");

1588 else

1589 nvme_rdma_end_request(req);

1590 }

1591

1592 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,

1593 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,

1594 struct ib_send_wr *first)

1595 {

1596 struct ib_send_wr wr;

1597 int ret;

1598

1599 sge->addr = qe->dma;

1600 sge->length = sizeof(struct nvme_command);

1601 sge->lkey = queue->device->pd->local_dma_lkey;

1602

1603 wr.next = NULL;

1604 wr.wr_cqe = &qe->cqe;

1605 wr.sg_list = sge;

1606 wr.num_sge = num_sge;

1607 wr.opcode = IB_WR_SEND;

1608 wr.send_flags = IB_SEND_SIGNALED;

1609

1610 if (first)

1611 first->next = &wr;

1612 else

1613 first = &wr;

1614

1615 ret = ib_post_send(queue->qp, first, NULL);

1616 if (unlikely(ret)) {

1617 dev_err(queue->ctrl->ctrl.device,

1618 "%s failed with error code %d\n", __func__, ret);

1619 }

1620 return ret;

1621 }

1622

1623 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,

1624 struct nvme_rdma_qe *qe)

1625 {

1626 struct ib_recv_wr wr;

1627 struct ib_sge list;

1628 int ret;

1629

1630 list.addr = qe->dma;

1631 list.length = sizeof(struct nvme_completion);

1632 list.lkey = queue->device->pd->local_dma_lkey;

1633

1634 qe->cqe.done = nvme_rdma_recv_done;

1635

1636 wr.next = NULL;

1637 wr.wr_cqe = &qe->cqe;

1638 wr.sg_list = &list;

1639 wr.num_sge = 1;

1640

1641 ret = ib_post_recv(queue->qp, &wr, NULL);

1642 if (unlikely(ret)) {

1643 dev_err(queue->ctrl->ctrl.device,

1644 "%s failed with error code %d\n", __func__, ret);

1645 }

1646 return ret;

1647 }

1648

1649 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)

1650 {

1651 u32 queue_idx = nvme_rdma_queue_idx(queue);

1652

1653 if (queue_idx == 0)

1654 return queue->ctrl->admin_tag_set.tags[queue_idx];

1655 return queue->ctrl->tag_set.tags[queue_idx - 1];

1656 }

1657

1658 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)

1659 {

1660 if (unlikely(wc->status != IB_WC_SUCCESS))

1661 nvme_rdma_wr_error(cq, wc, "ASYNC");

1662 }

1663

1664 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)

1665 {

1666 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);

1667 struct nvme_rdma_queue *queue = &ctrl->queues[0];

1668 struct ib_device *dev = queue->device->dev;

1669 struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;

1670 struct nvme_command *cmd = sqe->data;

1671 struct ib_sge sge;

1672 int ret;

1673

1674 ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);

1675

1676 memset(cmd, 0, sizeof(*cmd));

1677 cmd->common.opcode = nvme_admin_async_event;

1678 cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;

1679 cmd->common.flags |= NVME_CMD_SGL_METABUF;

1680 nvme_rdma_set_sg_null(cmd);

1681

1682 sqe->cqe.done = nvme_rdma_async_done;

1683

1684 ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),

1685 DMA_TO_DEVICE);

1686

1687 ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);

1688 WARN_ON_ONCE(ret);

1689 }

1690

1691 static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,

1692 struct nvme_completion *cqe, struct ib_wc *wc)

1693 {

1694 struct request *rq;

1695 struct nvme_rdma_request *req;

1696

1697 rq = nvme_find_rq(nvme_rdma_tagset(queue), cqe->command_id);

1698 if (!rq) {

1699 dev_err(queue->ctrl->ctrl.device,

1700 "got bad command_id %#x on QP %#x\n",

1701 cqe->command_id, queue->qp->qp_num);

1702 nvme_rdma_error_recovery(queue->ctrl);

1703 return;

1704 }

1705 req = blk_mq_rq_to_pdu(rq);

1706

1707 req->status = cqe->status;

1708 req->result = cqe->result;

1709

1710 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {

1711 if (unlikely(!req->mr ||

1712 wc->ex.invalidate_rkey != req->mr->rkey)) {

1713 dev_err(queue->ctrl->ctrl.device,

1714 "Bogus remote invalidation for rkey %#x\n",

1715 req->mr ? req->mr->rkey : 0);

1716 nvme_rdma_error_recovery(queue->ctrl);

1717 }

1718 } else if (req->mr) {

1719 int ret;

1720

1721 ret = nvme_rdma_inv_rkey(queue, req);

1722 if (unlikely(ret < 0)) {

1723 dev_err(queue->ctrl->ctrl.device,

1724 "Queueing INV WR for rkey %#x failed (%d)\n",

1725 req->mr->rkey, ret);

1726 nvme_rdma_error_recovery(queue->ctrl);

1727 }

1728 /* the local invalidation completion will end the request */

1729 return;

1730 }

1731

1732 nvme_rdma_end_request(req);

1733 }

1734

1735 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)

1736 {

1737 struct nvme_rdma_qe *qe =

1738 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);

1739 struct nvme_rdma_queue *queue = wc->qp->qp_context;

1740 struct ib_device *ibdev = queue->device->dev;

1741 struct nvme_completion *cqe = qe->data;

1742 const size_t len = sizeof(struct nvme_completion);

1743

1744 if (unlikely(wc->status != IB_WC_SUCCESS)) {

1745 nvme_rdma_wr_error(cq, wc, "RECV");

1746 return;

1747 }

1748

1749 /* sanity checking for received data length */

1750 if (unlikely(wc->byte_len < len)) {

1751 dev_err(queue->ctrl->ctrl.device,

1752 "Unexpected nvme completion length(%d)\n", wc->byte_len);

1753 nvme_rdma_error_recovery(queue->ctrl);

1754 return;

1755 }

1756

1757 ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);

1758 /*

1759 * AEN requests are special as they don't time out and can

1760 * survive any kind of queue freeze and often don't respond to

1761 * aborts. We don't even bother to allocate a struct request

1762 * for them but rather special case them here.

1763 */

1764 if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),

1765 cqe->command_id)))

1766 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,

1767 &cqe->result);

1768 else

1769 nvme_rdma_process_nvme_rsp(queue, cqe, wc);

1770 ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);

1771

1772 nvme_rdma_post_recv(queue, qe);

1773 }

1774

1775 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)

1776 {

1777 int ret, i;

1778

1779 for (i = 0; i < queue->queue_size; i++) {

1780 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);

1781 if (ret)

1782 return ret;

1783 }

1784

1785 return 0;

1786 }

1787

1788 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,

1789 struct rdma_cm_event *ev)

1790 {

1791 struct rdma_cm_id *cm_id = queue->cm_id;

1792 int status = ev->status;

1793 const char *rej_msg;

1794 const struct nvme_rdma_cm_rej *rej_data;

1795 u8 rej_data_len;

1796

1797 rej_msg = rdma_reject_msg(cm_id, status);

1798 rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);

1799

1800 if (rej_data && rej_data_len >= sizeof(u16)) {

1801 u16 sts = le16_to_cpu(rej_data->sts);

1802

1803 dev_err(queue->ctrl->ctrl.device,

1804 "Connect rejected: status %d (%s) nvme status %d (%s).\n",

1805 status, rej_msg, sts, nvme_rdma_cm_msg(sts));

1806 } else {

1807 dev_err(queue->ctrl->ctrl.device,

1808 "Connect rejected: status %d (%s).\n", status, rej_msg);

1809 }

1810

1811 return -ECONNRESET;

1812 }

1813

1814 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)

1815 {

1816 struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;

1817 int ret;

1818

1819 ret = nvme_rdma_create_queue_ib(queue);

1820 if (ret)

1821 return ret;

1822

1823 if (ctrl->opts->tos >= 0)

1824 rdma_set_service_type(queue->cm_id, ctrl->opts->tos);

1825 ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CM_TIMEOUT_MS);

1826 if (ret) {

1827 dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",

1828 queue->cm_error);

1829 goto out_destroy_queue;

1830 }

1831

1832 return 0;

1833

1834 out_destroy_queue:

1835 nvme_rdma_destroy_queue_ib(queue);

1836 return ret;

1837 }

1838

1839 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)

1840 {

1841 struct nvme_rdma_ctrl *ctrl = queue->ctrl;

1842 struct rdma_conn_param param = { };

1843 struct nvme_rdma_cm_req priv = { };

1844 int ret;

1845

1846 param.qp_num = queue->qp->qp_num;

1847 param.flow_control = 1;

1848

1849 param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;

1850 /* maximum retry count */

1851 param.retry_count = 7;

1852 param.rnr_retry_count = 7;

1853 param.private_data = &priv;

1854 param.private_data_len = sizeof(priv);

1855

1856 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);

1857 priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));

1858 /*

1859 * set the admin queue depth to the minimum size

1860 * specified by the Fabrics standard.

1861 */

1862 if (priv.qid == 0) {

1863 priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);

1864 priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);

1865 } else {

1866 /*

1867 * current interpretation of the fabrics spec

1868 * is at minimum you make hrqsize sqsize+1, or a

1869 * 1's based representation of sqsize.

1870 */

1871 priv.hrqsize = cpu_to_le16(queue->queue_size);

1872 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);

1873 /* cntlid should only be set when creating an I/O queue */

1874 priv.cntlid = cpu_to_le16(ctrl->ctrl.cntlid);

1875 }

1876

1877 ret = rdma_connect_locked(queue->cm_id, &param);

1878 if (ret) {

1879 dev_err(ctrl->ctrl.device,

1880 "rdma_connect_locked failed (%d).\n", ret);

1881 return ret;

1882 }

1883

1884 return 0;

1885 }

1886

1887 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,

1888 struct rdma_cm_event *ev)

1889 {

1890 struct nvme_rdma_queue *queue = cm_id->context;

1891 int cm_error = 0;

1892

1893 dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",

1894 rdma_event_msg(ev->event), ev->event,

1895 ev->status, cm_id);

1896

1897 switch (ev->event) {

1898 case RDMA_CM_EVENT_ADDR_RESOLVED:

1899 cm_error = nvme_rdma_addr_resolved(queue);

1900 break;

1901 case RDMA_CM_EVENT_ROUTE_RESOLVED:

1902 cm_error = nvme_rdma_route_resolved(queue);

1903 break;

1904 case RDMA_CM_EVENT_ESTABLISHED:

1905 queue->cm_error = nvme_rdma_conn_established(queue);

1906 /* complete cm_done regardless of success/failure */

1907 complete(&queue->cm_done);

1908 return 0;

1909 case RDMA_CM_EVENT_REJECTED:

1910 cm_error = nvme_rdma_conn_rejected(queue, ev);

1911 break;

1912 case RDMA_CM_EVENT_ROUTE_ERROR:

1913 case RDMA_CM_EVENT_CONNECT_ERROR:

1914 case RDMA_CM_EVENT_UNREACHABLE:

1915 case RDMA_CM_EVENT_ADDR_ERROR:

1916 dev_dbg(queue->ctrl->ctrl.device,

1917 "CM error event %d\n", ev->event);

1918 cm_error = -ECONNRESET;

1919 break;

1920 case RDMA_CM_EVENT_DISCONNECTED:

1921 case RDMA_CM_EVENT_ADDR_CHANGE:

1922 case RDMA_CM_EVENT_TIMEWAIT_EXIT:

1923 dev_dbg(queue->ctrl->ctrl.device,

1924 "disconnect received - connection closed\n");

1925 nvme_rdma_error_recovery(queue->ctrl);

1926 break;

1927 case RDMA_CM_EVENT_DEVICE_REMOVAL:

1928 /* device removal is handled via the ib_client API */

1929 break;

1930 default:

1931 dev_err(queue->ctrl->ctrl.device,

1932 "Unexpected RDMA CM event (%d)\n", ev->event);

1933 nvme_rdma_error_recovery(queue->ctrl);

1934 break;

1935 }

1936

1937 if (cm_error) {

1938 queue->cm_error = cm_error;

1939 complete(&queue->cm_done);

1940 }

1941

1942 return 0;

1943 }

1944

1945 static void nvme_rdma_complete_timed_out(struct request *rq)

1946 {

1947 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1948 struct nvme_rdma_queue *queue = req->queue;

1949

1950 nvme_rdma_stop_queue(queue);

1951 nvmf_complete_timed_out_request(rq);

1952 }

1953

1954 static enum blk_eh_timer_return nvme_rdma_timeout(struct request *rq)

1955 {

1956 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

1957 struct nvme_rdma_queue *queue = req->queue;

1958 struct nvme_rdma_ctrl *ctrl = queue->ctrl;

1959 struct nvme_command *cmd = req->req.cmd;

1960 int qid = nvme_rdma_queue_idx(queue);

1961

1962 dev_warn(ctrl->ctrl.device,

1963 "I/O tag %d (%04x) opcode %#x (%s) QID %d timeout\n",

1964 rq->tag, nvme_cid(rq), cmd->common.opcode,

1965 nvme_fabrics_opcode_str(qid, cmd), qid);

1966

1967 if (nvme_ctrl_state(&ctrl->ctrl) != NVME_CTRL_LIVE) {

1968 /*

1969 * If we are resetting, connecting or deleting we should

1970 * complete immediately because we may block controller

1971 * teardown or setup sequence

1972 * - ctrl disable/shutdown fabrics requests

1973 * - connect requests

1974 * - initialization admin requests

1975 * - I/O requests that entered after unquiescing and

1976 * the controller stopped responding

1977 *

1978 * All other requests should be cancelled by the error

1979 * recovery work, so it's fine that we fail it here.

1980 */

1981 nvme_rdma_complete_timed_out(rq);

1982 return BLK_EH_DONE;

1983 }

1984

1985 /*

1986 * LIVE state should trigger the normal error recovery which will

1987 * handle completing this request.

1988 */

1989 nvme_rdma_error_recovery(ctrl);

1990 return BLK_EH_RESET_TIMER;

1991 }

1992

1993 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,

1994 const struct blk_mq_queue_data *bd)

1995 {

1996 struct nvme_ns *ns = hctx->queue->queuedata;

1997 struct nvme_rdma_queue *queue = hctx->driver_data;

1998 struct request *rq = bd->rq;

1999 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

2000 struct nvme_rdma_qe *sqe = &req->sqe;

2001 struct nvme_command *c = nvme_req(rq)->cmd;

2002 struct ib_device *dev;

2003 bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);

2004 blk_status_t ret;

2005 int err;

2006

2007 WARN_ON_ONCE(rq->tag < 0);

2008

2009 if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))

2010 return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);

2011

2012 dev = queue->device->dev;

2013

2014 req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,

2015 sizeof(struct nvme_command),

2016 DMA_TO_DEVICE);

2017 err = ib_dma_mapping_error(dev, req->sqe.dma);

2018 if (unlikely(err))

2019 return BLK_STS_RESOURCE;

2020

2021 ib_dma_sync_single_for_cpu(dev, sqe->dma,

2022 sizeof(struct nvme_command), DMA_TO_DEVICE);

2023

2024 ret = nvme_setup_cmd(ns, rq);

2025 if (ret)

2026 goto unmap_qe;

2027

2028 nvme_start_request(rq);

2029

2030 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&

2031 queue->pi_support &&

2032 (c->common.opcode == nvme_cmd_write ||

2033 c->common.opcode == nvme_cmd_read) &&

2034 nvme_ns_has_pi(ns->head))

2035 req->use_sig_mr = true;

2036 else

2037 req->use_sig_mr = false;

2038

2039 err = nvme_rdma_map_data(queue, rq, c);

2040 if (unlikely(err < 0)) {

2041 dev_err(queue->ctrl->ctrl.device,

2042 "Failed to map data (%d)\n", err);

2043 goto err;

2044 }

2045

2046 sqe->cqe.done = nvme_rdma_send_done;

2047

2048 ib_dma_sync_single_for_device(dev, sqe->dma,

2049 sizeof(struct nvme_command), DMA_TO_DEVICE);

2050

2051 err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,

2052 req->mr ? &req->reg_wr.wr : NULL);

2053 if (unlikely(err))

2054 goto err_unmap;

2055

2056 return BLK_STS_OK;

2057

2058 err_unmap:

2059 nvme_rdma_unmap_data(queue, rq);

2060 err:

2061 if (err == -EIO)

2062 ret = nvme_host_path_error(rq);

2063 else if (err == -ENOMEM || err == -EAGAIN)

2064 ret = BLK_STS_RESOURCE;

2065 else

2066 ret = BLK_STS_IOERR;

2067 nvme_cleanup_cmd(rq);

2068 unmap_qe:

2069 ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),

2070 DMA_TO_DEVICE);

2071 return ret;

2072 }

2073

2074 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)

2075 {

2076 struct nvme_rdma_queue *queue = hctx->driver_data;

2077

2078 return ib_process_cq_direct(queue->ib_cq, -1);

2079 }

2080

2081 static void nvme_rdma_check_pi_status(struct nvme_rdma_request *req)

2082 {

2083 struct request *rq = blk_mq_rq_from_pdu(req);

2084 struct ib_mr_status mr_status;

2085 int ret;

2086

2087 ret = ib_check_mr_status(req->mr, IB_MR_CHECK_SIG_STATUS, &mr_status);

2088 if (ret) {

2089 pr_err("ib_check_mr_status failed, ret %d\n", ret);

2090 nvme_req(rq)->status = NVME_SC_INVALID_PI;

2091 return;

2092 }

2093

2094 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {

2095 switch (mr_status.sig_err.err_type) {

2096 case IB_SIG_BAD_GUARD:

2097 nvme_req(rq)->status = NVME_SC_GUARD_CHECK;

2098 break;

2099 case IB_SIG_BAD_REFTAG:

2100 nvme_req(rq)->status = NVME_SC_REFTAG_CHECK;

2101 break;

2102 case IB_SIG_BAD_APPTAG:

2103 nvme_req(rq)->status = NVME_SC_APPTAG_CHECK;

2104 break;

2105 }

2106 pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",

2107 mr_status.sig_err.err_type, mr_status.sig_err.expected,

2108 mr_status.sig_err.actual);

2109 }

2110 }

2111

2112 static void nvme_rdma_complete_rq(struct request *rq)

2113 {

2114 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);

2115 struct nvme_rdma_queue *queue = req->queue;

2116 struct ib_device *ibdev = queue->device->dev;

2117

2118 if (req->use_sig_mr)

2119 nvme_rdma_check_pi_status(req);

2120

2121 nvme_rdma_unmap_data(queue, rq);

2122 ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),

2123 DMA_TO_DEVICE);

2124 nvme_complete_rq(rq);

2125 }

2126

2127 static void nvme_rdma_map_queues(struct blk_mq_tag_set *set)

2128 {

2129 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(set->driver_data);

2130

2131 nvmf_map_queues(set, &ctrl->ctrl, ctrl->io_queues);

2132 }

2133

2134 static const struct blk_mq_ops nvme_rdma_mq_ops = {

2135 .queue_rq = nvme_rdma_queue_rq,

2136 .complete = nvme_rdma_complete_rq,

2137 .init_request = nvme_rdma_init_request,

2138 .exit_request = nvme_rdma_exit_request,

2139 .init_hctx = nvme_rdma_init_hctx,

2140 .timeout = nvme_rdma_timeout,

2141 .map_queues = nvme_rdma_map_queues,

2142 .poll = nvme_rdma_poll,

2143 };

2144

2145 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {

2146 .queue_rq = nvme_rdma_queue_rq,

2147 .complete = nvme_rdma_complete_rq,

2148 .init_request = nvme_rdma_init_request,

2149 .exit_request = nvme_rdma_exit_request,

2150 .init_hctx = nvme_rdma_init_admin_hctx,

2151 .timeout = nvme_rdma_timeout,

2152 };

2153

2154 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)

2155 {

2156 nvme_rdma_teardown_io_queues(ctrl, shutdown);

2157 nvme_quiesce_admin_queue(&ctrl->ctrl);

2158 nvme_disable_ctrl(&ctrl->ctrl, shutdown);

2159 nvme_rdma_teardown_admin_queue(ctrl, shutdown);

2160 }

2161

2162 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)

2163 {

2164 nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);

2165 }

2166

2167 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)

2168 {

2169 struct nvme_rdma_ctrl *ctrl =

2170 container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);

2171 int ret;

2172

2173 nvme_stop_ctrl(&ctrl->ctrl);

2174 nvme_rdma_shutdown_ctrl(ctrl, false);

2175

2176 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {

2177 /* state change failure should never happen */

2178 WARN_ON_ONCE(1);

2179 return;

2180 }

2181

2182 ret = nvme_rdma_setup_ctrl(ctrl, false);

2183 if (ret)

2184 goto out_fail;

2185

2186 return;

2187

2188 out_fail:

2189 ++ctrl->ctrl.nr_reconnects;

2190 nvme_rdma_reconnect_or_remove(ctrl, ret);

2191 }

2192

2193 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {

2194 .name = "rdma",

2195 .module = THIS_MODULE,

2196 .flags = NVME_F_FABRICS | NVME_F_METADATA_SUPPORTED,

2197 .reg_read32 = nvmf_reg_read32,

2198 .reg_read64 = nvmf_reg_read64,

2199 .reg_write32 = nvmf_reg_write32,

2200 .subsystem_reset = nvmf_subsystem_reset,

2201 .free_ctrl = nvme_rdma_free_ctrl,

2202 .submit_async_event = nvme_rdma_submit_async_event,

2203 .delete_ctrl = nvme_rdma_delete_ctrl,

2204 .get_address = nvmf_get_address,

2205 .stop_ctrl = nvme_rdma_stop_ctrl,

2206 };

2207

2208 /*

2209 * Fails a connection request if it matches an existing controller

2210 * (association) with the same tuple:

2211 * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>

2212 *

2213 * if local address is not specified in the request, it will match an

2214 * existing controller with all the other parameters the same and no

2215 * local port address specified as well.

2216 *

2217 * The ports don't need to be compared as they are intrinsically

2218 * already matched by the port pointers supplied.

2219 */

2220 static bool

2221 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)

2222 {

2223 struct nvme_rdma_ctrl *ctrl;

2224 bool found = false;

2225

2226 mutex_lock(&nvme_rdma_ctrl_mutex);

2227 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {

2228 found = nvmf_ip_options_match(&ctrl->ctrl, opts);

2229 if (found)

2230 break;

2231 }

2232 mutex_unlock(&nvme_rdma_ctrl_mutex);

2233

2234 return found;

2235 }

2236

2237 static struct nvme_rdma_ctrl *nvme_rdma_alloc_ctrl(struct device *dev,

2238 struct nvmf_ctrl_options *opts)

2239 {

2240 struct nvme_rdma_ctrl *ctrl;

2241 int ret;

2242

2243 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);

2244 if (!ctrl)

2245 return ERR_PTR(-ENOMEM);

2246 ctrl->ctrl.opts = opts;

2247 INIT_LIST_HEAD(&ctrl->list);

2248

2249 if (!(opts->mask & NVMF_OPT_TRSVCID)) {

2250 opts->trsvcid =

2251 kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);

2252 if (!opts->trsvcid) {

2253 ret = -ENOMEM;

2254 goto out_free_ctrl;

2255 }

2256 opts->mask |= NVMF_OPT_TRSVCID;

2257 }

2258

2259 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,

2260 opts->traddr, opts->trsvcid, &ctrl->addr);

2261 if (ret) {

2262 pr_err("malformed address passed: %s:%s\n",

2263 opts->traddr, opts->trsvcid);

2264 goto out_free_ctrl;

2265 }

2266

2267 if (opts->mask & NVMF_OPT_HOST_TRADDR) {

2268 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,

2269 opts->host_traddr, NULL, &ctrl->src_addr);

2270 if (ret) {

2271 pr_err("malformed src address passed: %s\n",

2272 opts->host_traddr);

2273 goto out_free_ctrl;

2274 }

2275 }

2276

2277 if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {

2278 ret = -EALREADY;

2279 goto out_free_ctrl;

2280 }

2281

2282 INIT_DELAYED_WORK(&ctrl->reconnect_work,

2283 nvme_rdma_reconnect_ctrl_work);

2284 INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);

2285 INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);

2286

2287 ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +

2288 opts->nr_poll_queues + 1;

2289 ctrl->ctrl.sqsize = opts->queue_size - 1;

2290 ctrl->ctrl.kato = opts->kato;

2291

2292 ret = -ENOMEM;

2293 ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),

2294 GFP_KERNEL);

2295 if (!ctrl->queues)

2296 goto out_free_ctrl;

2297

2298 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,

2299 0 /* no quirks, we're perfect! */);

2300 if (ret)

2301 goto out_kfree_queues;

2302

2303 return ctrl;

2304

2305 out_kfree_queues:

2306 kfree(ctrl->queues);

2307 out_free_ctrl:

2308 kfree(ctrl);

2309 return ERR_PTR(ret);

2310 }

2311

2312 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,

2313 struct nvmf_ctrl_options *opts)

2314 {

2315 struct nvme_rdma_ctrl *ctrl;

2316 bool changed;

2317 int ret;

2318

2319 ctrl = nvme_rdma_alloc_ctrl(dev, opts);

2320 if (IS_ERR(ctrl))

2321 return ERR_CAST(ctrl);

2322

2323 ret = nvme_add_ctrl(&ctrl->ctrl);

2324 if (ret)

2325 goto out_put_ctrl;

2326

2327 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);

2328 WARN_ON_ONCE(!changed);

2329

2330 ret = nvme_rdma_setup_ctrl(ctrl, true);

2331 if (ret)

2332 goto out_uninit_ctrl;

2333

2334 dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs, hostnqn: %s\n",

2335 nvmf_ctrl_subsysnqn(&ctrl->ctrl), &ctrl->addr, opts->host->nqn);

2336

2337 mutex_lock(&nvme_rdma_ctrl_mutex);

2338 list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);

2339 mutex_unlock(&nvme_rdma_ctrl_mutex);

2340

2341 return &ctrl->ctrl;

2342

2343 out_uninit_ctrl:

2344 nvme_uninit_ctrl(&ctrl->ctrl);

2345 out_put_ctrl:

2346 nvme_put_ctrl(&ctrl->ctrl);

2347 if (ret > 0)

2348 ret = -EIO;

2349 return ERR_PTR(ret);

2350 }

2351

2352 static struct nvmf_transport_ops nvme_rdma_transport = {

2353 .name = "rdma",

2354 .module = THIS_MODULE,

2355 .required_opts = NVMF_OPT_TRADDR,

2356 .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |

2357 NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |

2358 NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |

2359 NVMF_OPT_TOS,

2360 .create_ctrl = nvme_rdma_create_ctrl,

2361 };

2362

2363 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)

2364 {

2365 struct nvme_rdma_ctrl *ctrl;

2366 struct nvme_rdma_device *ndev;

2367 bool found = false;

2368

2369 mutex_lock(&device_list_mutex);

2370 list_for_each_entry(ndev, &device_list, entry) {

2371 if (ndev->dev == ib_device) {

2372 found = true;

2373 break;

2374 }

2375 }

2376 mutex_unlock(&device_list_mutex);

2377

2378 if (!found)

2379 return;

2380

2381 /* Delete all controllers using this device */

2382 mutex_lock(&nvme_rdma_ctrl_mutex);

2383 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {

2384 if (ctrl->device->dev != ib_device)

2385 continue;

2386 nvme_delete_ctrl(&ctrl->ctrl);

2387 }

2388 mutex_unlock(&nvme_rdma_ctrl_mutex);

2389

2390 flush_workqueue(nvme_delete_wq);

2391 }

2392

2393 static struct ib_client nvme_rdma_ib_client = {

2394 .name = "nvme_rdma",

2395 .remove = nvme_rdma_remove_one

2396 };

2397

2398 static int __init nvme_rdma_init_module(void)

2399 {

2400 int ret;

2401

2402 ret = ib_register_client(&nvme_rdma_ib_client);

2403 if (ret)

2404 return ret;

2405

2406 ret = nvmf_register_transport(&nvme_rdma_transport);

2407 if (ret)

2408 goto err_unreg_client;

2409

2410 return 0;

2411

2412 err_unreg_client:

2413 ib_unregister_client(&nvme_rdma_ib_client);

2414 return ret;

2415 }

2416

2417 static void __exit nvme_rdma_cleanup_module(void)

2418 {

2419 struct nvme_rdma_ctrl *ctrl;

2420

2421 nvmf_unregister_transport(&nvme_rdma_transport);

2422 ib_unregister_client(&nvme_rdma_ib_client);

2423

2424 mutex_lock(&nvme_rdma_ctrl_mutex);

2425 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)

2426 nvme_delete_ctrl(&ctrl->ctrl);

2427 mutex_unlock(&nvme_rdma_ctrl_mutex);

2428 flush_workqueue(nvme_delete_wq);

2429 }

2430

2431 module_init(nvme_rdma_init_module);

2432 module_exit(nvme_rdma_cleanup_module);

2433

2434 MODULE_DESCRIPTION("NVMe host RDMA transport driver");

2435 MODULE_LICENSE("GPL v2");