xref: /linux/drivers/nvme/host/rdma.c (revision 9b960d8cd6f712cb2c03e2bdd4d5ca058238037f)
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 
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 };
49 
50 struct nvme_rdma_qe {
51 	struct ib_cqe		cqe;
52 	void			*data;
53 	u64			dma;
54 };
55 
56 struct nvme_rdma_sgl {
57 	int			nents;
58 	struct sg_table		sg_table;
59 };
60 
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 };
78 
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 };
84 
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;
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 
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 
to_rdma_ctrl(struct nvme_ctrl * ctrl)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 
nvme_rdma_queue_idx(struct nvme_rdma_queue * queue)159 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
160 {
161 	return queue - queue->ctrl->queues;
162 }
163 
nvme_rdma_poll_queue(struct nvme_rdma_queue * queue)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 
nvme_rdma_inline_data_size(struct nvme_rdma_queue * queue)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 
nvme_rdma_free_qe(struct ib_device * ibdev,struct nvme_rdma_qe * qe,size_t capsule_size,enum dma_data_direction dir)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 
nvme_rdma_alloc_qe(struct ib_device * ibdev,struct nvme_rdma_qe * qe,size_t capsule_size,enum dma_data_direction dir)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 
nvme_rdma_free_ring(struct ib_device * ibdev,struct nvme_rdma_qe * ring,size_t ib_queue_size,size_t capsule_size,enum dma_data_direction dir)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 
nvme_rdma_alloc_ring(struct ib_device * ibdev,size_t ib_queue_size,size_t capsule_size,enum dma_data_direction dir)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 
nvme_rdma_qp_event(struct ib_event * event,void * context)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 
nvme_rdma_wait_for_cm(struct nvme_rdma_queue * queue)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 
nvme_rdma_create_qp(struct nvme_rdma_queue * queue,const int factor)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 
nvme_rdma_exit_request(struct blk_mq_tag_set * set,struct request * rq,unsigned int hctx_idx)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 
nvme_rdma_init_request(struct blk_mq_tag_set * set,struct request * rq,unsigned int hctx_idx,unsigned int numa_node)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 
nvme_rdma_init_hctx(struct blk_mq_hw_ctx * hctx,void * data,unsigned int hctx_idx)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 
nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx * hctx,void * data,unsigned int hctx_idx)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 
nvme_rdma_free_dev(struct kref * ref)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 
nvme_rdma_dev_put(struct nvme_rdma_device * dev)356 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
357 {
358 	kref_put(&dev->ref, nvme_rdma_free_dev);
359 }
360 
nvme_rdma_dev_get(struct nvme_rdma_device * dev)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 *
nvme_rdma_find_get_device(struct rdma_cm_id * cm_id)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 
nvme_rdma_free_cq(struct nvme_rdma_queue * queue)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 
nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue * queue)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 
nvme_rdma_get_max_fr_pages(struct ib_device * ibdev,bool pi_support)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 
nvme_rdma_create_cq(struct ib_device * ibdev,struct nvme_rdma_queue * queue)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 
nvme_rdma_create_queue_ib(struct nvme_rdma_queue * queue)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 
nvme_rdma_alloc_queue(struct nvme_rdma_ctrl * ctrl,int idx,size_t queue_size)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 
__nvme_rdma_stop_queue(struct nvme_rdma_queue * queue)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 
nvme_rdma_stop_queue(struct nvme_rdma_queue * queue)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 
nvme_rdma_free_queue(struct nvme_rdma_queue * queue)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 
nvme_rdma_free_io_queues(struct nvme_rdma_ctrl * ctrl)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 
nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl * ctrl)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 
nvme_rdma_start_queue(struct nvme_rdma_ctrl * ctrl,int idx)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 
nvme_rdma_start_io_queues(struct nvme_rdma_ctrl * ctrl,int first,int last)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 
nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl * ctrl)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 
nvme_rdma_alloc_tag_set(struct nvme_ctrl * ctrl)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 
nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl * ctrl)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 
nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl * ctrl,bool new)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 
nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl * ctrl,bool new)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 
nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl * ctrl,bool remove)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 
nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl * ctrl,bool remove)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 
nvme_rdma_stop_ctrl(struct nvme_ctrl * nctrl)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 
nvme_rdma_free_ctrl(struct nvme_ctrl * nctrl)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 
nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl * ctrl,int status)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 
nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl * ctrl,bool new)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 
nvme_rdma_reconnect_ctrl_work(struct work_struct * work)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 
nvme_rdma_error_recovery_work(struct work_struct * work)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 
nvme_rdma_error_recovery(struct nvme_rdma_ctrl * ctrl)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 
nvme_rdma_end_request(struct nvme_rdma_request * req)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 
nvme_rdma_wr_error(struct ib_cq * cq,struct ib_wc * wc,const char * op)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 
nvme_rdma_memreg_done(struct ib_cq * cq,struct ib_wc * wc)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 
nvme_rdma_inv_rkey_done(struct ib_cq * cq,struct ib_wc * wc)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 
nvme_rdma_inv_rkey(struct nvme_rdma_queue * queue,struct nvme_rdma_request * req)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 
nvme_rdma_dma_unmap_req(struct ib_device * ibdev,struct request * rq)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 
nvme_rdma_unmap_data(struct nvme_rdma_queue * queue,struct request * rq)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 
nvme_rdma_set_sg_null(struct nvme_command * c)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 
nvme_rdma_map_sg_inline(struct nvme_rdma_queue * queue,struct nvme_rdma_request * req,struct nvme_command * c,int count)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 
nvme_rdma_map_sg_single(struct nvme_rdma_queue * queue,struct nvme_rdma_request * req,struct nvme_command * c)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 
nvme_rdma_map_sg_fr(struct nvme_rdma_queue * queue,struct nvme_rdma_request * req,struct nvme_command * c,int count)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 
nvme_rdma_set_sig_domain(struct blk_integrity * bi,struct nvme_command * cmd,struct ib_sig_domain * domain,u16 control,u8 pi_type)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 
nvme_rdma_set_sig_attrs(struct blk_integrity * bi,struct nvme_command * cmd,struct ib_sig_attrs * sig_attrs,u8 pi_type)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 
nvme_rdma_set_prot_checks(struct nvme_command * cmd,u8 * mask)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 
nvme_rdma_sig_done(struct ib_cq * cq,struct ib_wc * wc)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 
nvme_rdma_map_sg_pi(struct nvme_rdma_queue * queue,struct nvme_rdma_request * req,struct nvme_command * c,int count,int pi_count)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 
nvme_rdma_dma_map_req(struct ib_device * ibdev,struct request * rq,int * count,int * pi_count)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, 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 
1514 out_free_pi_table:
1515 	sg_free_table_chained(&req->metadata_sgl->sg_table,
1516 			      NVME_INLINE_METADATA_SG_CNT);
1517 out_unmap_sg:
1518 	ib_dma_unmap_sg(ibdev, req->data_sgl.sg_table.sgl, req->data_sgl.nents,
1519 			rq_dma_dir(rq));
1520 out_free_table:
1521 	sg_free_table_chained(&req->data_sgl.sg_table, NVME_INLINE_SG_CNT);
1522 	return ret;
1523 }
1524 
nvme_rdma_map_data(struct nvme_rdma_queue * queue,struct request * rq,struct nvme_command * c)1525 static 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);
1567 out:
1568 	if (unlikely(ret))
1569 		goto out_dma_unmap_req;
1570 
1571 	return 0;
1572 
1573 out_dma_unmap_req:
1574 	nvme_rdma_dma_unmap_req(ibdev, rq);
1575 	return ret;
1576 }
1577 
nvme_rdma_send_done(struct ib_cq * cq,struct ib_wc * wc)1578 static 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 
nvme_rdma_post_send(struct nvme_rdma_queue * queue,struct nvme_rdma_qe * qe,struct ib_sge * sge,u32 num_sge,struct ib_send_wr * first)1591 static 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 
nvme_rdma_post_recv(struct nvme_rdma_queue * queue,struct nvme_rdma_qe * qe)1622 static 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 
nvme_rdma_tagset(struct nvme_rdma_queue * queue)1648 static 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 
nvme_rdma_async_done(struct ib_cq * cq,struct ib_wc * wc)1657 static 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 
nvme_rdma_submit_async_event(struct nvme_ctrl * arg)1663 static 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 
nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue * queue,struct nvme_completion * cqe,struct ib_wc * wc)1690 static 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 
nvme_rdma_recv_done(struct ib_cq * cq,struct ib_wc * wc)1734 static 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 
nvme_rdma_conn_established(struct nvme_rdma_queue * queue)1774 static 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 
nvme_rdma_conn_rejected(struct nvme_rdma_queue * queue,struct rdma_cm_event * ev)1787 static 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 
nvme_rdma_addr_resolved(struct nvme_rdma_queue * queue)1813 static 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 
1833 out_destroy_queue:
1834 	nvme_rdma_destroy_queue_ib(queue);
1835 	return ret;
1836 }
1837 
nvme_rdma_route_resolved(struct nvme_rdma_queue * queue)1838 static 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 
nvme_rdma_cm_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * ev)1886 static 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 
nvme_rdma_complete_timed_out(struct request * rq)1944 static 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 
nvme_rdma_timeout(struct request * rq)1953 static 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 
nvme_rdma_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)1992 static 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 
2057 err_unmap:
2058 	nvme_rdma_unmap_data(queue, rq);
2059 err:
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);
2067 unmap_qe:
2068 	ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
2069 			    DMA_TO_DEVICE);
2070 	return ret;
2071 }
2072 
nvme_rdma_poll(struct blk_mq_hw_ctx * hctx,struct io_comp_batch * iob)2073 static 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 
nvme_rdma_check_pi_status(struct nvme_rdma_request * req)2080 static 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 
nvme_rdma_complete_rq(struct request * rq)2111 static 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 
nvme_rdma_map_queues(struct blk_mq_tag_set * set)2126 static 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 
2133 static 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 
2144 static 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 
nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl * ctrl,bool shutdown)2153 static 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 
nvme_rdma_delete_ctrl(struct nvme_ctrl * ctrl)2161 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
2162 {
2163 	nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
2164 }
2165 
nvme_rdma_reset_ctrl_work(struct work_struct * work)2166 static 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 
2187 out_fail:
2188 	++ctrl->ctrl.nr_reconnects;
2189 	nvme_rdma_reconnect_or_remove(ctrl, ret);
2190 }
2191 
2192 static 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 };
2206 
2207 /*
2208  * Fails a connection request if it matches an existing controller
2209  * (association) with the same tuple:
2210  * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
2211  *
2212  * if local address is not specified in the request, it will match an
2213  * existing controller with all the other parameters the same and no
2214  * local port address specified as well.
2215  *
2216  * The ports don't need to be compared as they are intrinsically
2217  * already matched by the port pointers supplied.
2218  */
2219 static bool
nvme_rdma_existing_controller(struct nvmf_ctrl_options * opts)2220 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
2221 {
2222 	struct nvme_rdma_ctrl *ctrl;
2223 	bool found = false;
2224 
2225 	mutex_lock(&nvme_rdma_ctrl_mutex);
2226 	list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2227 		found = nvmf_ip_options_match(&ctrl->ctrl, opts);
2228 		if (found)
2229 			break;
2230 	}
2231 	mutex_unlock(&nvme_rdma_ctrl_mutex);
2232 
2233 	return found;
2234 }
2235 
nvme_rdma_alloc_ctrl(struct device * dev,struct nvmf_ctrl_options * opts)2236 static struct nvme_rdma_ctrl *nvme_rdma_alloc_ctrl(struct device *dev,
2237 		struct nvmf_ctrl_options *opts)
2238 {
2239 	struct nvme_rdma_ctrl *ctrl;
2240 	int ret;
2241 
2242 	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
2243 	if (!ctrl)
2244 		return ERR_PTR(-ENOMEM);
2245 	ctrl->ctrl.opts = opts;
2246 	INIT_LIST_HEAD(&ctrl->list);
2247 
2248 	if (!(opts->mask & NVMF_OPT_TRSVCID)) {
2249 		opts->trsvcid =
2250 			kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);
2251 		if (!opts->trsvcid) {
2252 			ret = -ENOMEM;
2253 			goto out_free_ctrl;
2254 		}
2255 		opts->mask |= NVMF_OPT_TRSVCID;
2256 	}
2257 
2258 	ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2259 			opts->traddr, opts->trsvcid, &ctrl->addr);
2260 	if (ret) {
2261 		pr_err("malformed address passed: %s:%s\n",
2262 			opts->traddr, opts->trsvcid);
2263 		goto out_free_ctrl;
2264 	}
2265 
2266 	if (opts->mask & NVMF_OPT_HOST_TRADDR) {
2267 		ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2268 			opts->host_traddr, NULL, &ctrl->src_addr);
2269 		if (ret) {
2270 			pr_err("malformed src address passed: %s\n",
2271 			       opts->host_traddr);
2272 			goto out_free_ctrl;
2273 		}
2274 	}
2275 
2276 	if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
2277 		ret = -EALREADY;
2278 		goto out_free_ctrl;
2279 	}
2280 
2281 	INIT_DELAYED_WORK(&ctrl->reconnect_work,
2282 			nvme_rdma_reconnect_ctrl_work);
2283 	INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
2284 	INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
2285 
2286 	ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
2287 				opts->nr_poll_queues + 1;
2288 	ctrl->ctrl.sqsize = opts->queue_size - 1;
2289 	ctrl->ctrl.kato = opts->kato;
2290 
2291 	ret = -ENOMEM;
2292 	ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
2293 				GFP_KERNEL);
2294 	if (!ctrl->queues)
2295 		goto out_free_ctrl;
2296 
2297 	ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
2298 				0 /* no quirks, we're perfect! */);
2299 	if (ret)
2300 		goto out_kfree_queues;
2301 
2302 	return ctrl;
2303 
2304 out_kfree_queues:
2305 	kfree(ctrl->queues);
2306 out_free_ctrl:
2307 	kfree(ctrl);
2308 	return ERR_PTR(ret);
2309 }
2310 
nvme_rdma_create_ctrl(struct device * dev,struct nvmf_ctrl_options * opts)2311 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
2312 		struct nvmf_ctrl_options *opts)
2313 {
2314 	struct nvme_rdma_ctrl *ctrl;
2315 	bool changed;
2316 	int ret;
2317 
2318 	ctrl = nvme_rdma_alloc_ctrl(dev, opts);
2319 	if (IS_ERR(ctrl))
2320 		return ERR_CAST(ctrl);
2321 
2322 	ret = nvme_add_ctrl(&ctrl->ctrl);
2323 	if (ret)
2324 		goto out_put_ctrl;
2325 
2326 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
2327 	WARN_ON_ONCE(!changed);
2328 
2329 	ret = nvme_rdma_setup_ctrl(ctrl, true);
2330 	if (ret)
2331 		goto out_uninit_ctrl;
2332 
2333 	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs, hostnqn: %s\n",
2334 		nvmf_ctrl_subsysnqn(&ctrl->ctrl), &ctrl->addr, opts->host->nqn);
2335 
2336 	mutex_lock(&nvme_rdma_ctrl_mutex);
2337 	list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
2338 	mutex_unlock(&nvme_rdma_ctrl_mutex);
2339 
2340 	return &ctrl->ctrl;
2341 
2342 out_uninit_ctrl:
2343 	nvme_uninit_ctrl(&ctrl->ctrl);
2344 out_put_ctrl:
2345 	nvme_put_ctrl(&ctrl->ctrl);
2346 	if (ret > 0)
2347 		ret = -EIO;
2348 	return ERR_PTR(ret);
2349 }
2350 
2351 static struct nvmf_transport_ops nvme_rdma_transport = {
2352 	.name		= "rdma",
2353 	.module		= THIS_MODULE,
2354 	.required_opts	= NVMF_OPT_TRADDR,
2355 	.allowed_opts	= NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
2356 			  NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
2357 			  NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
2358 			  NVMF_OPT_TOS,
2359 	.create_ctrl	= nvme_rdma_create_ctrl,
2360 };
2361 
nvme_rdma_remove_one(struct ib_device * ib_device,void * client_data)2362 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2363 {
2364 	struct nvme_rdma_ctrl *ctrl;
2365 	struct nvme_rdma_device *ndev;
2366 	bool found = false;
2367 
2368 	mutex_lock(&device_list_mutex);
2369 	list_for_each_entry(ndev, &device_list, entry) {
2370 		if (ndev->dev == ib_device) {
2371 			found = true;
2372 			break;
2373 		}
2374 	}
2375 	mutex_unlock(&device_list_mutex);
2376 
2377 	if (!found)
2378 		return;
2379 
2380 	/* Delete all controllers using this device */
2381 	mutex_lock(&nvme_rdma_ctrl_mutex);
2382 	list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2383 		if (ctrl->device->dev != ib_device)
2384 			continue;
2385 		nvme_delete_ctrl(&ctrl->ctrl);
2386 	}
2387 	mutex_unlock(&nvme_rdma_ctrl_mutex);
2388 
2389 	flush_workqueue(nvme_delete_wq);
2390 }
2391 
2392 static struct ib_client nvme_rdma_ib_client = {
2393 	.name   = "nvme_rdma",
2394 	.remove = nvme_rdma_remove_one
2395 };
2396 
nvme_rdma_init_module(void)2397 static int __init nvme_rdma_init_module(void)
2398 {
2399 	int ret;
2400 
2401 	ret = ib_register_client(&nvme_rdma_ib_client);
2402 	if (ret)
2403 		return ret;
2404 
2405 	ret = nvmf_register_transport(&nvme_rdma_transport);
2406 	if (ret)
2407 		goto err_unreg_client;
2408 
2409 	return 0;
2410 
2411 err_unreg_client:
2412 	ib_unregister_client(&nvme_rdma_ib_client);
2413 	return ret;
2414 }
2415 
nvme_rdma_cleanup_module(void)2416 static void __exit nvme_rdma_cleanup_module(void)
2417 {
2418 	struct nvme_rdma_ctrl *ctrl;
2419 
2420 	nvmf_unregister_transport(&nvme_rdma_transport);
2421 	ib_unregister_client(&nvme_rdma_ib_client);
2422 
2423 	mutex_lock(&nvme_rdma_ctrl_mutex);
2424 	list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)
2425 		nvme_delete_ctrl(&ctrl->ctrl);
2426 	mutex_unlock(&nvme_rdma_ctrl_mutex);
2427 	flush_workqueue(nvme_delete_wq);
2428 }
2429 
2430 module_init(nvme_rdma_init_module);
2431 module_exit(nvme_rdma_cleanup_module);
2432 
2433 MODULE_DESCRIPTION("NVMe host RDMA transport driver");
2434 MODULE_LICENSE("GPL v2");
2435