rdma.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * NVMe over Fabrics RDMA host code.
   4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   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>
  22
  23#include <rdma/ib_verbs.h>
  24#include <rdma/rdma_cm.h>
  25#include <linux/nvme-rdma.h>
  26
  27#include "nvme.h"
  28#include "fabrics.h"
  29
  30
  31#define NVME_RDMA_CM_TIMEOUT_MS		3000		/* 3 second */
  32
  33#define NVME_RDMA_MAX_SEGMENTS		256
  34
  35#define NVME_RDMA_MAX_INLINE_SEGMENTS	4
  36
  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)
  41
  42struct 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};
  49
  50struct nvme_rdma_qe {
  51	struct ib_cqe		cqe;
  52	void			*data;
  53	u64			dma;
  54};
  55
  56struct nvme_rdma_sgl {
  57	int			nents;
  58	struct sg_table		sg_table;
  59};
  60
  61struct nvme_rdma_queue;
  62struct 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};
  78
  79enum nvme_rdma_queue_flags {
  80	NVME_RDMA_Q_ALLOCATED		= 0,
  81	NVME_RDMA_Q_LIVE		= 1,
  82	NVME_RDMA_Q_TR_READY		= 2,
  83};
  84
  85struct 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;
  93
  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
 103struct 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
 130static 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
 135static LIST_HEAD(device_list);
 136static DEFINE_MUTEX(device_list_mutex);
 137
 138static LIST_HEAD(nvme_rdma_ctrl_list);
 139static 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 */
 146static bool register_always = true;
 147module_param(register_always, bool, 0444);
 148MODULE_PARM_DESC(register_always,
 149	 "Use memory registration even for contiguous memory regions");
 150
 151static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
 152		struct rdma_cm_event *event);
 153static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 154static void nvme_rdma_complete_rq(struct request *rq);
 155
 156static const struct blk_mq_ops nvme_rdma_mq_ops;
 157static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
 158
 159static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
 160{
 161	return queue - queue->ctrl->queues;
 162}
 163
 164static 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
 171static 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
 176static 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
 183static 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
 200static 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
 211static 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 change 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
 234out_free_ring:
 235	nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
 236	return NULL;
 237}
 238
 239static 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
 246static 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
 257static 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
 285static 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
 293static 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
 319static 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
 331static 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
 343static 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
 356static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
 357{
 358	kref_put(&dev->ref, nvme_rdma_free_dev);
 359}
 360
 361static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
 362{
 363	return kref_get_unless_zero(&dev->ref);
 364}
 365
 366static struct nvme_rdma_device *
 367nvme_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);
 400out_unlock:
 401	mutex_unlock(&device_list_mutex);
 402	return ndev;
 403
 404out_free_pd:
 405	ib_dealloc_pd(ndev->pd);
 406out_free_dev:
 407	kfree(ndev);
 408out_err:
 409	mutex_unlock(&device_list_mutex);
 410	return NULL;
 411}
 412
 413static 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
 421static 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
 450static 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
 462static 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
 489static 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
 555out_destroy_mr_pool:
 556	ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
 557out_destroy_ring:
 558	nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
 559			    sizeof(struct nvme_completion), DMA_FROM_DEVICE);
 560out_destroy_qp:
 561	rdma_destroy_qp(queue->cm_id);
 562out_destroy_ib_cq:
 563	nvme_rdma_free_cq(queue);
 564out_put_dev:
 565	nvme_rdma_dev_put(queue->device);
 566	return ret;
 567}
 568
 569static 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
 625out_destroy_cm_id:
 626	rdma_destroy_id(queue->cm_id);
 627	nvme_rdma_destroy_queue_ib(queue);
 628out_destroy_mutex:
 629	mutex_destroy(&queue->queue_lock);
 630	return ret;
 631}
 632
 633static 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
 639static 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
 650static 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
 660static 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
 668static 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
 676static 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
 697static 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
 710out_stop_queues:
 711	for (i--; i >= first; i--)
 712		nvme_rdma_stop_queue(&ctrl->queues[i]);
 713	return ret;
 714}
 715
 716static 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
 747out_free_queues:
 748	for (i--; i >= 1; i--)
 749		nvme_rdma_free_queue(&ctrl->queues[i]);
 750
 751	return ret;
 752}
 753
 754static 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
 769static 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
 780static 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 change 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
 844out_quiesce_queue:
 845	nvme_quiesce_admin_queue(&ctrl->ctrl);
 846	blk_sync_queue(ctrl->ctrl.admin_q);
 847out_stop_queue:
 848	nvme_rdma_stop_queue(&ctrl->queues[0]);
 849	nvme_cancel_admin_tagset(&ctrl->ctrl);
 850out_remove_admin_tag_set:
 851	if (new)
 852		nvme_remove_admin_tag_set(&ctrl->ctrl);
 853out_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	}
 859out_free_queue:
 860	nvme_rdma_free_queue(&ctrl->queues[0]);
 861	return error;
 862}
 863
 864static 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 limited 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
 917out_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);
 921out_cleanup_tagset:
 922	nvme_cancel_tagset(&ctrl->ctrl);
 923	if (new)
 924		nvme_remove_io_tag_set(&ctrl->ctrl);
 925out_free_io_queues:
 926	nvme_rdma_free_io_queues(ctrl);
 927	return ret;
 928}
 929
 930static 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
 944static 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
 960static 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
 968static 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);
 980free_ctrl:
 981	kfree(ctrl->queues);
 982	kfree(ctrl);
 983}
 984
 985static 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
1006static 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
1082destroy_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	}
1092destroy_admin:
1093	nvme_stop_keep_alive(&ctrl->ctrl);
1094	nvme_rdma_teardown_admin_queue(ctrl, new);
1095	return ret;
1096}
1097
1098static 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
1117requeue:
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
1123static 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
1148static 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
1157static 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
1167static 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
1181static 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
1187static 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
1198static 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
1215static 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
1231static 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
1253static 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
1264static 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
1290static 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
1302static 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
1349static 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
1367static 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
1391static 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
1400static 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
1406static 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
1458mr_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
1466static 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, req->data_sgl.sg_table.sgl);
1480
1481	*count = ib_dma_map_sg(ibdev, req->data_sgl.sg_table.sgl,
1482			       req->data_sgl.nents, rq_dma_dir(rq));
1483	if (unlikely(*count <= 0)) {
1484		ret = -EIO;
1485		goto out_free_table;
1486	}
1487
1488	if (blk_integrity_rq(rq)) {
1489		req->metadata_sgl->sg_table.sgl =
1490			(struct scatterlist *)(req->metadata_sgl + 1);
1491		ret = sg_alloc_table_chained(&req->metadata_sgl->sg_table,
1492				rq->nr_integrity_segments,
1493				req->metadata_sgl->sg_table.sgl,
1494				NVME_INLINE_METADATA_SG_CNT);
1495		if (unlikely(ret)) {
1496			ret = -ENOMEM;
1497			goto out_unmap_sg;
1498		}
1499
1500		req->metadata_sgl->nents = blk_rq_map_integrity_sg(rq,
1501				req->metadata_sgl->sg_table.sgl);
1502		*pi_count = ib_dma_map_sg(ibdev,
1503					  req->metadata_sgl->sg_table.sgl,
1504					  req->metadata_sgl->nents,
1505					  rq_dma_dir(rq));
1506		if (unlikely(*pi_count <= 0)) {
1507			ret = -EIO;
1508			goto out_free_pi_table;
1509		}
1510	}
1511
1512	return 0;
1513
1514out_free_pi_table:
1515	sg_free_table_chained(&req->metadata_sgl->sg_table,
1516			      NVME_INLINE_METADATA_SG_CNT);
1517out_unmap_sg:
1518	ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1519			rq_dma_dir(rq));
1520out_free_table:
1521	sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1522	return ret;
1523}
1524
1525static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
1526		struct request *rq, struct nvme_command *c)
1527{
1528	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1529	struct nvme_rdma_device *dev = queue->device;
1530	struct ib_device *ibdev = dev->dev;
1531	int pi_count = 0;
1532	int count, ret;
1533
1534	req->num_sge = 1;
1535	refcount_set(&req->ref, 2); /* send and recv completions */
1536
1537	c->common.flags |= NVME_CMD_SGL_METABUF;
1538
1539	if (!blk_rq_nr_phys_segments(rq))
1540		return nvme_rdma_set_sg_null(c);
1541
1542	ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count);
1543	if (unlikely(ret))
1544		return ret;
1545
1546	if (req->use_sig_mr) {
1547		ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count);
1548		goto out;
1549	}
1550
1551	if (count <= dev->num_inline_segments) {
1552		if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1553		    queue->ctrl->use_inline_data &&
1554		    blk_rq_payload_bytes(rq) <=
1555				nvme_rdma_inline_data_size(queue)) {
1556			ret = nvme_rdma_map_sg_inline(queue, req, c, count);
1557			goto out;
1558		}
1559
1560		if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
1561			ret = nvme_rdma_map_sg_single(queue, req, c);
1562			goto out;
1563		}
1564	}
1565
1566	ret = nvme_rdma_map_sg_fr(queue, req, c, count);
1567out:
1568	if (unlikely(ret))
1569		goto out_dma_unmap_req;
1570
1571	return 0;
1572
1573out_dma_unmap_req:
1574	nvme_rdma_dma_unmap_req(ibdev, rq);
1575	return ret;
1576}
1577
1578static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1579{
1580	struct nvme_rdma_qe *qe =
1581		container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1582	struct nvme_rdma_request *req =
1583		container_of(qe, struct nvme_rdma_request, sqe);
1584
1585	if (unlikely(wc->status != IB_WC_SUCCESS))
1586		nvme_rdma_wr_error(cq, wc, "SEND");
1587	else
1588		nvme_rdma_end_request(req);
1589}
1590
1591static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1592		struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1593		struct ib_send_wr *first)
1594{
1595	struct ib_send_wr wr;
1596	int ret;
1597
1598	sge->addr   = qe->dma;
1599	sge->length = sizeof(struct nvme_command);
1600	sge->lkey   = queue->device->pd->local_dma_lkey;
1601
1602	wr.next       = NULL;
1603	wr.wr_cqe     = &qe->cqe;
1604	wr.sg_list    = sge;
1605	wr.num_sge    = num_sge;
1606	wr.opcode     = IB_WR_SEND;
1607	wr.send_flags = IB_SEND_SIGNALED;
1608
1609	if (first)
1610		first->next = &wr;
1611	else
1612		first = &wr;
1613
1614	ret = ib_post_send(queue->qp, first, NULL);
1615	if (unlikely(ret)) {
1616		dev_err(queue->ctrl->ctrl.device,
1617			     "%s failed with error code %d\n", __func__, ret);
1618	}
1619	return ret;
1620}
1621
1622static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1623		struct nvme_rdma_qe *qe)
1624{
1625	struct ib_recv_wr wr;
1626	struct ib_sge list;
1627	int ret;
1628
1629	list.addr   = qe->dma;
1630	list.length = sizeof(struct nvme_completion);
1631	list.lkey   = queue->device->pd->local_dma_lkey;
1632
1633	qe->cqe.done = nvme_rdma_recv_done;
1634
1635	wr.next     = NULL;
1636	wr.wr_cqe   = &qe->cqe;
1637	wr.sg_list  = &list;
1638	wr.num_sge  = 1;
1639
1640	ret = ib_post_recv(queue->qp, &wr, NULL);
1641	if (unlikely(ret)) {
1642		dev_err(queue->ctrl->ctrl.device,
1643			"%s failed with error code %d\n", __func__, ret);
1644	}
1645	return ret;
1646}
1647
1648static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1649{
1650	u32 queue_idx = nvme_rdma_queue_idx(queue);
1651
1652	if (queue_idx == 0)
1653		return queue->ctrl->admin_tag_set.tags[queue_idx];
1654	return queue->ctrl->tag_set.tags[queue_idx - 1];
1655}
1656
1657static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
1658{
1659	if (unlikely(wc->status != IB_WC_SUCCESS))
1660		nvme_rdma_wr_error(cq, wc, "ASYNC");
1661}
1662
1663static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
1664{
1665	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1666	struct nvme_rdma_queue *queue = &ctrl->queues[0];
1667	struct ib_device *dev = queue->device->dev;
1668	struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1669	struct nvme_command *cmd = sqe->data;
1670	struct ib_sge sge;
1671	int ret;
1672
1673	ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1674
1675	memset(cmd, 0, sizeof(*cmd));
1676	cmd->common.opcode = nvme_admin_async_event;
1677	cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1678	cmd->common.flags |= NVME_CMD_SGL_METABUF;
1679	nvme_rdma_set_sg_null(cmd);
1680
1681	sqe->cqe.done = nvme_rdma_async_done;
1682
1683	ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1684			DMA_TO_DEVICE);
1685
1686	ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
1687	WARN_ON_ONCE(ret);
1688}
1689
1690static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1691		struct nvme_completion *cqe, struct ib_wc *wc)
1692{
1693	struct request *rq;
1694	struct nvme_rdma_request *req;
1695
1696	rq = nvme_find_rq(nvme_rdma_tagset(queue), cqe->command_id);
1697	if (!rq) {
1698		dev_err(queue->ctrl->ctrl.device,
1699			"got bad command_id %#x on QP %#x\n",
1700			cqe->command_id, queue->qp->qp_num);
1701		nvme_rdma_error_recovery(queue->ctrl);
1702		return;
1703	}
1704	req = blk_mq_rq_to_pdu(rq);
1705
1706	req->status = cqe->status;
1707	req->result = cqe->result;
1708
1709	if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
1710		if (unlikely(!req->mr ||
1711			     wc->ex.invalidate_rkey != req->mr->rkey)) {
1712			dev_err(queue->ctrl->ctrl.device,
1713				"Bogus remote invalidation for rkey %#x\n",
1714				req->mr ? req->mr->rkey : 0);
1715			nvme_rdma_error_recovery(queue->ctrl);
1716		}
1717	} else if (req->mr) {
1718		int ret;
1719
1720		ret = nvme_rdma_inv_rkey(queue, req);
1721		if (unlikely(ret < 0)) {
1722			dev_err(queue->ctrl->ctrl.device,
1723				"Queueing INV WR for rkey %#x failed (%d)\n",
1724				req->mr->rkey, ret);
1725			nvme_rdma_error_recovery(queue->ctrl);
1726		}
1727		/* the local invalidation completion will end the request */
1728		return;
1729	}
1730
1731	nvme_rdma_end_request(req);
1732}
1733
1734static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1735{
1736	struct nvme_rdma_qe *qe =
1737		container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1738	struct nvme_rdma_queue *queue = wc->qp->qp_context;
1739	struct ib_device *ibdev = queue->device->dev;
1740	struct nvme_completion *cqe = qe->data;
1741	const size_t len = sizeof(struct nvme_completion);
1742
1743	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1744		nvme_rdma_wr_error(cq, wc, "RECV");
1745		return;
1746	}
1747
1748	/* sanity checking for received data length */
1749	if (unlikely(wc->byte_len < len)) {
1750		dev_err(queue->ctrl->ctrl.device,
1751			"Unexpected nvme completion length(%d)\n", wc->byte_len);
1752		nvme_rdma_error_recovery(queue->ctrl);
1753		return;
1754	}
1755
1756	ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1757	/*
1758	 * AEN requests are special as they don't time out and can
1759	 * survive any kind of queue freeze and often don't respond to
1760	 * aborts.  We don't even bother to allocate a struct request
1761	 * for them but rather special case them here.
1762	 */
1763	if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),
1764				     cqe->command_id)))
1765		nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1766				&cqe->result);
1767	else
1768		nvme_rdma_process_nvme_rsp(queue, cqe, wc);
1769	ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1770
1771	nvme_rdma_post_recv(queue, qe);
1772}
1773
1774static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1775{
1776	int ret, i;
1777
1778	for (i = 0; i < queue->queue_size; i++) {
1779		ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1780		if (ret)
1781			return ret;
1782	}
1783
1784	return 0;
1785}
1786
1787static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1788		struct rdma_cm_event *ev)
1789{
1790	struct rdma_cm_id *cm_id = queue->cm_id;
1791	int status = ev->status;
1792	const char *rej_msg;
1793	const struct nvme_rdma_cm_rej *rej_data;
1794	u8 rej_data_len;
1795
1796	rej_msg = rdma_reject_msg(cm_id, status);
1797	rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1798
1799	if (rej_data && rej_data_len >= sizeof(u16)) {
1800		u16 sts = le16_to_cpu(rej_data->sts);
1801
1802		dev_err(queue->ctrl->ctrl.device,
1803		      "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1804		      status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1805	} else {
1806		dev_err(queue->ctrl->ctrl.device,
1807			"Connect rejected: status %d (%s).\n", status, rej_msg);
1808	}
1809
1810	return -ECONNRESET;
1811}
1812
1813static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1814{
1815	struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;
1816	int ret;
1817
1818	ret = nvme_rdma_create_queue_ib(queue);
1819	if (ret)
1820		return ret;
1821
1822	if (ctrl->opts->tos >= 0)
1823		rdma_set_service_type(queue->cm_id, ctrl->opts->tos);
1824	ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CM_TIMEOUT_MS);
1825	if (ret) {
1826		dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",
1827			queue->cm_error);
1828		goto out_destroy_queue;
1829	}
1830
1831	return 0;
1832
1833out_destroy_queue:
1834	nvme_rdma_destroy_queue_ib(queue);
1835	return ret;
1836}
1837
1838static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1839{
1840	struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1841	struct rdma_conn_param param = { };
1842	struct nvme_rdma_cm_req priv = { };
1843	int ret;
1844
1845	param.qp_num = queue->qp->qp_num;
1846	param.flow_control = 1;
1847
1848	param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1849	/* maximum retry count */
1850	param.retry_count = 7;
1851	param.rnr_retry_count = 7;
1852	param.private_data = &priv;
1853	param.private_data_len = sizeof(priv);
1854
1855	priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1856	priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1857	/*
1858	 * set the admin queue depth to the minimum size
1859	 * specified by the Fabrics standard.
1860	 */
1861	if (priv.qid == 0) {
1862		priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
1863		priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
1864	} else {
1865		/*
1866		 * current interpretation of the fabrics spec
1867		 * is at minimum you make hrqsize sqsize+1, or a
1868		 * 1's based representation of sqsize.
1869		 */
1870		priv.hrqsize = cpu_to_le16(queue->queue_size);
1871		priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1872		/* cntlid should only be set when creating an I/O queue */
1873		priv.cntlid = cpu_to_le16(ctrl->ctrl.cntlid);
1874	}
1875
1876	ret = rdma_connect_locked(queue->cm_id, &param);
1877	if (ret) {
1878		dev_err(ctrl->ctrl.device,
1879			"rdma_connect_locked failed (%d).\n", ret);
1880		return ret;
1881	}
1882
1883	return 0;
1884}
1885
1886static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1887		struct rdma_cm_event *ev)
1888{
1889	struct nvme_rdma_queue *queue = cm_id->context;
1890	int cm_error = 0;
1891
1892	dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1893		rdma_event_msg(ev->event), ev->event,
1894		ev->status, cm_id);
1895
1896	switch (ev->event) {
1897	case RDMA_CM_EVENT_ADDR_RESOLVED:
1898		cm_error = nvme_rdma_addr_resolved(queue);
1899		break;
1900	case RDMA_CM_EVENT_ROUTE_RESOLVED:
1901		cm_error = nvme_rdma_route_resolved(queue);
1902		break;
1903	case RDMA_CM_EVENT_ESTABLISHED:
1904		queue->cm_error = nvme_rdma_conn_established(queue);
1905		/* complete cm_done regardless of success/failure */
1906		complete(&queue->cm_done);
1907		return 0;
1908	case RDMA_CM_EVENT_REJECTED:
1909		cm_error = nvme_rdma_conn_rejected(queue, ev);
1910		break;
1911	case RDMA_CM_EVENT_ROUTE_ERROR:
1912	case RDMA_CM_EVENT_CONNECT_ERROR:
1913	case RDMA_CM_EVENT_UNREACHABLE:
1914	case RDMA_CM_EVENT_ADDR_ERROR:
1915		dev_dbg(queue->ctrl->ctrl.device,
1916			"CM error event %d\n", ev->event);
1917		cm_error = -ECONNRESET;
1918		break;
1919	case RDMA_CM_EVENT_DISCONNECTED:
1920	case RDMA_CM_EVENT_ADDR_CHANGE:
1921	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1922		dev_dbg(queue->ctrl->ctrl.device,
1923			"disconnect received - connection closed\n");
1924		nvme_rdma_error_recovery(queue->ctrl);
1925		break;
1926	case RDMA_CM_EVENT_DEVICE_REMOVAL:
1927		/* device removal is handled via the ib_client API */
1928		break;
1929	default:
1930		dev_err(queue->ctrl->ctrl.device,
1931			"Unexpected RDMA CM event (%d)\n", ev->event);
1932		nvme_rdma_error_recovery(queue->ctrl);
1933		break;
1934	}
1935
1936	if (cm_error) {
1937		queue->cm_error = cm_error;
1938		complete(&queue->cm_done);
1939	}
1940
1941	return 0;
1942}
1943
1944static void nvme_rdma_complete_timed_out(struct request *rq)
1945{
1946	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1947	struct nvme_rdma_queue *queue = req->queue;
1948
1949	nvme_rdma_stop_queue(queue);
1950	nvmf_complete_timed_out_request(rq);
1951}
1952
1953static enum blk_eh_timer_return nvme_rdma_timeout(struct request *rq)
1954{
1955	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1956	struct nvme_rdma_queue *queue = req->queue;
1957	struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1958	struct nvme_command *cmd = req->req.cmd;
1959	int qid = nvme_rdma_queue_idx(queue);
1960
1961	dev_warn(ctrl->ctrl.device,
1962		 "I/O tag %d (%04x) opcode %#x (%s) QID %d timeout\n",
1963		 rq->tag, nvme_cid(rq), cmd->common.opcode,
1964		 nvme_fabrics_opcode_str(qid, cmd), qid);
1965
1966	if (nvme_ctrl_state(&ctrl->ctrl) != NVME_CTRL_LIVE) {
1967		/*
1968		 * If we are resetting, connecting or deleting we should
1969		 * complete immediately because we may block controller
1970		 * teardown or setup sequence
1971		 * - ctrl disable/shutdown fabrics requests
1972		 * - connect requests
1973		 * - initialization admin requests
1974		 * - I/O requests that entered after unquiescing and
1975		 *   the controller stopped responding
1976		 *
1977		 * All other requests should be cancelled by the error
1978		 * recovery work, so it's fine that we fail it here.
1979		 */
1980		nvme_rdma_complete_timed_out(rq);
1981		return BLK_EH_DONE;
1982	}
1983
1984	/*
1985	 * LIVE state should trigger the normal error recovery which will
1986	 * handle completing this request.
1987	 */
1988	nvme_rdma_error_recovery(ctrl);
1989	return BLK_EH_RESET_TIMER;
1990}
1991
1992static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
1993		const struct blk_mq_queue_data *bd)
1994{
1995	struct nvme_ns *ns = hctx->queue->queuedata;
1996	struct nvme_rdma_queue *queue = hctx->driver_data;
1997	struct request *rq = bd->rq;
1998	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1999	struct nvme_rdma_qe *sqe = &req->sqe;
2000	struct nvme_command *c = nvme_req(rq)->cmd;
2001	struct ib_device *dev;
2002	bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
2003	blk_status_t ret;
2004	int err;
2005
2006	WARN_ON_ONCE(rq->tag < 0);
2007
2008	if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
2009		return nvme_fail_nonready_command(&queue->ctrl->ctrl, rq);
2010
2011	dev = queue->device->dev;
2012
2013	req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,
2014					 sizeof(struct nvme_command),
2015					 DMA_TO_DEVICE);
2016	err = ib_dma_mapping_error(dev, req->sqe.dma);
2017	if (unlikely(err))
2018		return BLK_STS_RESOURCE;
2019
2020	ib_dma_sync_single_for_cpu(dev, sqe->dma,
2021			sizeof(struct nvme_command), DMA_TO_DEVICE);
2022
2023	ret = nvme_setup_cmd(ns, rq);
2024	if (ret)
2025		goto unmap_qe;
2026
2027	nvme_start_request(rq);
2028
2029	if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
2030	    queue->pi_support &&
2031	    (c->common.opcode == nvme_cmd_write ||
2032	     c->common.opcode == nvme_cmd_read) &&
2033	    nvme_ns_has_pi(ns->head))
2034		req->use_sig_mr = true;
2035	else
2036		req->use_sig_mr = false;
2037
2038	err = nvme_rdma_map_data(queue, rq, c);
2039	if (unlikely(err < 0)) {
2040		dev_err(queue->ctrl->ctrl.device,
2041			     "Failed to map data (%d)\n", err);
2042		goto err;
2043	}
2044
2045	sqe->cqe.done = nvme_rdma_send_done;
2046
2047	ib_dma_sync_single_for_device(dev, sqe->dma,
2048			sizeof(struct nvme_command), DMA_TO_DEVICE);
2049
2050	err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
2051			req->mr ? &req->reg_wr.wr : NULL);
2052	if (unlikely(err))
2053		goto err_unmap;
2054
2055	return BLK_STS_OK;
2056
2057err_unmap:
2058	nvme_rdma_unmap_data(queue, rq);
2059err:
2060	if (err == -EIO)
2061		ret = nvme_host_path_error(rq);
2062	else if (err == -ENOMEM || err == -EAGAIN)
2063		ret = BLK_STS_RESOURCE;
2064	else
2065		ret = BLK_STS_IOERR;
2066	nvme_cleanup_cmd(rq);
2067unmap_qe:
2068	ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
2069			    DMA_TO_DEVICE);
2070	return ret;
2071}
2072
2073static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
2074{
2075	struct nvme_rdma_queue *queue = hctx->driver_data;
2076
2077	return ib_process_cq_direct(queue->ib_cq, -1);
2078}
2079
2080static void nvme_rdma_check_pi_status(struct nvme_rdma_request *req)
2081{
2082	struct request *rq = blk_mq_rq_from_pdu(req);
2083	struct ib_mr_status mr_status;
2084	int ret;
2085
2086	ret = ib_check_mr_status(req->mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
2087	if (ret) {
2088		pr_err("ib_check_mr_status failed, ret %d\n", ret);
2089		nvme_req(rq)->status = NVME_SC_INVALID_PI;
2090		return;
2091	}
2092
2093	if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
2094		switch (mr_status.sig_err.err_type) {
2095		case IB_SIG_BAD_GUARD:
2096			nvme_req(rq)->status = NVME_SC_GUARD_CHECK;
2097			break;
2098		case IB_SIG_BAD_REFTAG:
2099			nvme_req(rq)->status = NVME_SC_REFTAG_CHECK;
2100			break;
2101		case IB_SIG_BAD_APPTAG:
2102			nvme_req(rq)->status = NVME_SC_APPTAG_CHECK;
2103			break;
2104		}
2105		pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
2106		       mr_status.sig_err.err_type, mr_status.sig_err.expected,
2107		       mr_status.sig_err.actual);
2108	}
2109}
2110
2111static void nvme_rdma_complete_rq(struct request *rq)
2112{
2113	struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
2114	struct nvme_rdma_queue *queue = req->queue;
2115	struct ib_device *ibdev = queue->device->dev;
2116
2117	if (req->use_sig_mr)
2118		nvme_rdma_check_pi_status(req);
2119
2120	nvme_rdma_unmap_data(queue, rq);
2121	ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),
2122			    DMA_TO_DEVICE);
2123	nvme_complete_rq(rq);
2124}
2125
2126static void nvme_rdma_map_queues(struct blk_mq_tag_set *set)
2127{
2128	struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(set->driver_data);
2129
2130	nvmf_map_queues(set, &ctrl->ctrl, ctrl->io_queues);
2131}
2132
2133static const struct blk_mq_ops nvme_rdma_mq_ops = {
2134	.queue_rq	= nvme_rdma_queue_rq,
2135	.complete	= nvme_rdma_complete_rq,
2136	.init_request	= nvme_rdma_init_request,
2137	.exit_request	= nvme_rdma_exit_request,
2138	.init_hctx	= nvme_rdma_init_hctx,
2139	.timeout	= nvme_rdma_timeout,
2140	.map_queues	= nvme_rdma_map_queues,
2141	.poll		= nvme_rdma_poll,
2142};
2143
2144static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
2145	.queue_rq	= nvme_rdma_queue_rq,
2146	.complete	= nvme_rdma_complete_rq,
2147	.init_request	= nvme_rdma_init_request,
2148	.exit_request	= nvme_rdma_exit_request,
2149	.init_hctx	= nvme_rdma_init_admin_hctx,
2150	.timeout	= nvme_rdma_timeout,
2151};
2152
2153static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
2154{
2155	nvme_rdma_teardown_io_queues(ctrl, shutdown);
2156	nvme_quiesce_admin_queue(&ctrl->ctrl);
2157	nvme_disable_ctrl(&ctrl->ctrl, shutdown);
2158	nvme_rdma_teardown_admin_queue(ctrl, shutdown);
2159}
2160
2161static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
2162{
2163	nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
2164}
2165
2166static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
2167{
2168	struct nvme_rdma_ctrl *ctrl =
2169		container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
2170	int ret;
2171
2172	nvme_stop_ctrl(&ctrl->ctrl);
2173	nvme_rdma_shutdown_ctrl(ctrl, false);
2174
2175	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
2176		/* state change failure should never happen */
2177		WARN_ON_ONCE(1);
2178		return;
2179	}
2180
2181	ret = nvme_rdma_setup_ctrl(ctrl, false);
2182	if (ret)
2183		goto out_fail;
2184
2185	return;
2186
2187out_fail:
2188	++ctrl->ctrl.nr_reconnects;
2189	nvme_rdma_reconnect_or_remove(ctrl, ret);
2190}
2191
2192static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
2193	.name			= "rdma",
2194	.module			= THIS_MODULE,
2195	.flags			= NVME_F_FABRICS | NVME_F_METADATA_SUPPORTED,
2196	.reg_read32		= nvmf_reg_read32,
2197	.reg_read64		= nvmf_reg_read64,
2198	.reg_write32		= nvmf_reg_write32,
2199	.subsystem_reset	= nvmf_subsystem_reset,
2200	.free_ctrl		= nvme_rdma_free_ctrl,
2201	.submit_async_event	= nvme_rdma_submit_async_event,
2202	.delete_ctrl		= nvme_rdma_delete_ctrl,
2203	.get_address		= nvmf_get_address,
2204	.stop_ctrl		= nvme_rdma_stop_ctrl,
2205	.get_virt_boundary	= nvme_get_virt_boundary,
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 */
2220static bool
2221nvme_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
2237static 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
2305out_kfree_queues:
2306	kfree(ctrl->queues);
2307out_free_ctrl:
2308	kfree(ctrl);
2309	return ERR_PTR(ret);
2310}
2311
2312static 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
2343out_uninit_ctrl:
2344	nvme_uninit_ctrl(&ctrl->ctrl);
2345out_put_ctrl:
2346	nvme_put_ctrl(&ctrl->ctrl);
2347	if (ret > 0)
2348		ret = -EIO;
2349	return ERR_PTR(ret);
2350}
2351
2352static 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
2363static 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
2393static struct ib_client nvme_rdma_ib_client = {
2394	.name   = "nvme_rdma",
2395	.remove = nvme_rdma_remove_one
2396};
2397
2398static 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
2412err_unreg_client:
2413	ib_unregister_client(&nvme_rdma_ib_client);
2414	return ret;
2415}
2416
2417static 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
2431module_init(nvme_rdma_init_module);
2432module_exit(nvme_rdma_cleanup_module);
2433
2434MODULE_DESCRIPTION("NVMe host RDMA transport driver");
2435MODULE_LICENSE("GPL v2");