xref: /linux/drivers/nvme/target/rdma.c (revision 8a61cb6e150ea907b580a1b5e705decb0a3ffc86)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * NVMe over Fabrics RDMA target.
4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
5  */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/atomic.h>
8 #include <linux/blk-integrity.h>
9 #include <linux/ctype.h>
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/nvme.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/wait.h>
18 #include <linux/inet.h>
19 #include <linux/unaligned.h>
20 
21 #include <rdma/ib_verbs.h>
22 #include <rdma/rdma_cm.h>
23 #include <rdma/rw.h>
24 #include <rdma/ib_cm.h>
25 
26 #include <linux/nvme-rdma.h>
27 #include "nvmet.h"
28 
29 /*
30  * We allow at least 1 page, up to 4 SGEs, and up to 16KB of inline data
31  */
32 #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE	PAGE_SIZE
33 #define NVMET_RDMA_MAX_INLINE_SGE		4
34 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE		max_t(int, SZ_16K, PAGE_SIZE)
35 
36 /* Assume mpsmin == device_page_size == 4KB */
37 #define NVMET_RDMA_MAX_MDTS			8
38 #define NVMET_RDMA_MAX_METADATA_MDTS		5
39 
40 #define NVMET_RDMA_BACKLOG 128
41 
42 #define NVMET_RDMA_DISCRETE_RSP_TAG		-1
43 
44 struct nvmet_rdma_srq;
45 
46 struct nvmet_rdma_cmd {
47 	struct ib_sge		sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
48 	struct ib_cqe		cqe;
49 	struct ib_recv_wr	wr;
50 	struct scatterlist	inline_sg[NVMET_RDMA_MAX_INLINE_SGE];
51 	struct nvme_command     *nvme_cmd;
52 	struct nvmet_rdma_queue	*queue;
53 	struct nvmet_rdma_srq   *nsrq;
54 };
55 
56 enum {
57 	NVMET_RDMA_REQ_INLINE_DATA	= (1 << 0),
58 };
59 
60 struct nvmet_rdma_rsp {
61 	struct ib_sge		send_sge;
62 	struct ib_cqe		send_cqe;
63 	struct ib_send_wr	send_wr;
64 
65 	struct nvmet_rdma_cmd	*cmd;
66 	struct nvmet_rdma_queue	*queue;
67 
68 	struct ib_cqe		read_cqe;
69 	struct ib_cqe		write_cqe;
70 	struct rdma_rw_ctx	rw;
71 
72 	struct nvmet_req	req;
73 
74 	bool			allocated;
75 	u8			n_rdma;
76 	u32			flags;
77 	u32			invalidate_rkey;
78 
79 	struct list_head	wait_list;
80 	int			tag;
81 };
82 
83 enum nvmet_rdma_queue_state {
84 	NVMET_RDMA_Q_CONNECTING,
85 	NVMET_RDMA_Q_LIVE,
86 	NVMET_RDMA_Q_DISCONNECTING,
87 };
88 
89 struct nvmet_rdma_queue {
90 	struct rdma_cm_id	*cm_id;
91 	struct ib_qp		*qp;
92 	struct nvmet_port	*port;
93 	struct ib_cq		*cq;
94 	atomic_t		sq_wr_avail;
95 	struct nvmet_rdma_device *dev;
96 	struct nvmet_rdma_srq   *nsrq;
97 	spinlock_t		state_lock;
98 	enum nvmet_rdma_queue_state state;
99 	struct nvmet_cq		nvme_cq;
100 	struct nvmet_sq		nvme_sq;
101 
102 	struct nvmet_rdma_rsp	*rsps;
103 	struct sbitmap		rsp_tags;
104 	struct nvmet_rdma_cmd	*cmds;
105 
106 	struct work_struct	release_work;
107 	struct list_head	rsp_wait_list;
108 	struct list_head	rsp_wr_wait_list;
109 	spinlock_t		rsp_wr_wait_lock;
110 
111 	int			idx;
112 	int			host_qid;
113 	int			comp_vector;
114 	int			recv_queue_size;
115 	int			send_queue_size;
116 
117 	struct list_head	queue_list;
118 };
119 
120 struct nvmet_rdma_port {
121 	struct nvmet_port	*nport;
122 	struct sockaddr_storage addr;
123 	struct rdma_cm_id	*cm_id;
124 	struct delayed_work	repair_work;
125 };
126 
127 struct nvmet_rdma_srq {
128 	struct ib_srq            *srq;
129 	struct nvmet_rdma_cmd    *cmds;
130 	struct nvmet_rdma_device *ndev;
131 };
132 
133 struct nvmet_rdma_device {
134 	struct ib_device	*device;
135 	struct ib_pd		*pd;
136 	struct nvmet_rdma_srq	**srqs;
137 	int			srq_count;
138 	size_t			srq_size;
139 	struct kref		ref;
140 	struct list_head	entry;
141 	int			inline_data_size;
142 	int			inline_page_count;
143 };
144 
145 static bool nvmet_rdma_use_srq;
146 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
147 MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
148 
149 static int srq_size_set(const char *val, const struct kernel_param *kp);
150 static const struct kernel_param_ops srq_size_ops = {
151 	.set = srq_size_set,
152 	.get = param_get_int,
153 };
154 
155 static int nvmet_rdma_srq_size = 1024;
156 module_param_cb(srq_size, &srq_size_ops, &nvmet_rdma_srq_size, 0644);
157 MODULE_PARM_DESC(srq_size, "set Shared Receive Queue (SRQ) size, should >= 256 (default: 1024)");
158 
159 static DEFINE_IDA(nvmet_rdma_queue_ida);
160 static LIST_HEAD(nvmet_rdma_queue_list);
161 static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
162 
163 static LIST_HEAD(device_list);
164 static DEFINE_MUTEX(device_list_mutex);
165 
166 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
167 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
168 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
169 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
170 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc);
171 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
172 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
173 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
174 				struct nvmet_rdma_rsp *r);
175 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
176 				struct nvmet_rdma_rsp *r,
177 				int tag);
178 
179 static const struct nvmet_fabrics_ops nvmet_rdma_ops;
180 
srq_size_set(const char * val,const struct kernel_param * kp)181 static int srq_size_set(const char *val, const struct kernel_param *kp)
182 {
183 	int n = 0, ret;
184 
185 	ret = kstrtoint(val, 10, &n);
186 	if (ret != 0 || n < 256)
187 		return -EINVAL;
188 
189 	return param_set_int(val, kp);
190 }
191 
num_pages(int len)192 static int num_pages(int len)
193 {
194 	return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT);
195 }
196 
nvmet_rdma_need_data_in(struct nvmet_rdma_rsp * rsp)197 static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
198 {
199 	return nvme_is_write(rsp->req.cmd) &&
200 		rsp->req.transfer_len &&
201 		!(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
202 }
203 
nvmet_rdma_need_data_out(struct nvmet_rdma_rsp * rsp)204 static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
205 {
206 	return !nvme_is_write(rsp->req.cmd) &&
207 		rsp->req.transfer_len &&
208 		!rsp->req.cqe->status &&
209 		!(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
210 }
211 
212 static inline struct nvmet_rdma_rsp *
nvmet_rdma_get_rsp(struct nvmet_rdma_queue * queue)213 nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
214 {
215 	struct nvmet_rdma_rsp *rsp = NULL;
216 	int tag;
217 
218 	tag = sbitmap_get(&queue->rsp_tags);
219 	if (tag >= 0)
220 		rsp = &queue->rsps[tag];
221 
222 	if (unlikely(!rsp)) {
223 		int ret;
224 
225 		rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
226 		if (unlikely(!rsp))
227 			return NULL;
228 		ret = nvmet_rdma_alloc_rsp(queue->dev, rsp,
229 				NVMET_RDMA_DISCRETE_RSP_TAG);
230 		if (unlikely(ret)) {
231 			kfree(rsp);
232 			return NULL;
233 		}
234 	}
235 
236 	return rsp;
237 }
238 
239 static inline void
nvmet_rdma_put_rsp(struct nvmet_rdma_rsp * rsp)240 nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
241 {
242 	if (unlikely(rsp->tag == NVMET_RDMA_DISCRETE_RSP_TAG)) {
243 		nvmet_rdma_free_rsp(rsp->queue->dev, rsp);
244 		kfree(rsp);
245 		return;
246 	}
247 
248 	sbitmap_clear_bit(&rsp->queue->rsp_tags, rsp->tag);
249 }
250 
nvmet_rdma_free_inline_pages(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * c)251 static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev,
252 				struct nvmet_rdma_cmd *c)
253 {
254 	struct scatterlist *sg;
255 	struct ib_sge *sge;
256 	int i;
257 
258 	if (!ndev->inline_data_size)
259 		return;
260 
261 	sg = c->inline_sg;
262 	sge = &c->sge[1];
263 
264 	for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
265 		if (sge->length)
266 			ib_dma_unmap_page(ndev->device, sge->addr,
267 					sge->length, DMA_FROM_DEVICE);
268 		if (sg_page(sg))
269 			__free_page(sg_page(sg));
270 	}
271 }
272 
nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * c)273 static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev,
274 				struct nvmet_rdma_cmd *c)
275 {
276 	struct scatterlist *sg;
277 	struct ib_sge *sge;
278 	struct page *pg;
279 	int len;
280 	int i;
281 
282 	if (!ndev->inline_data_size)
283 		return 0;
284 
285 	sg = c->inline_sg;
286 	sg_init_table(sg, ndev->inline_page_count);
287 	sge = &c->sge[1];
288 	len = ndev->inline_data_size;
289 
290 	for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
291 		pg = alloc_page(GFP_KERNEL);
292 		if (!pg)
293 			goto out_err;
294 		sg_assign_page(sg, pg);
295 		sge->addr = ib_dma_map_page(ndev->device,
296 			pg, 0, PAGE_SIZE, DMA_FROM_DEVICE);
297 		if (ib_dma_mapping_error(ndev->device, sge->addr))
298 			goto out_err;
299 		sge->length = min_t(int, len, PAGE_SIZE);
300 		sge->lkey = ndev->pd->local_dma_lkey;
301 		len -= sge->length;
302 	}
303 
304 	return 0;
305 out_err:
306 	for (; i >= 0; i--, sg--, sge--) {
307 		if (sge->length)
308 			ib_dma_unmap_page(ndev->device, sge->addr,
309 					sge->length, DMA_FROM_DEVICE);
310 		if (sg_page(sg))
311 			__free_page(sg_page(sg));
312 	}
313 	return -ENOMEM;
314 }
315 
nvmet_rdma_alloc_cmd(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * c,bool admin)316 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
317 			struct nvmet_rdma_cmd *c, bool admin)
318 {
319 	/* NVMe command / RDMA RECV */
320 	c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
321 	if (!c->nvme_cmd)
322 		goto out;
323 
324 	c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
325 			sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
326 	if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
327 		goto out_free_cmd;
328 
329 	c->sge[0].length = sizeof(*c->nvme_cmd);
330 	c->sge[0].lkey = ndev->pd->local_dma_lkey;
331 
332 	if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c))
333 		goto out_unmap_cmd;
334 
335 	c->cqe.done = nvmet_rdma_recv_done;
336 
337 	c->wr.wr_cqe = &c->cqe;
338 	c->wr.sg_list = c->sge;
339 	c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1;
340 
341 	return 0;
342 
343 out_unmap_cmd:
344 	ib_dma_unmap_single(ndev->device, c->sge[0].addr,
345 			sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
346 out_free_cmd:
347 	kfree(c->nvme_cmd);
348 
349 out:
350 	return -ENOMEM;
351 }
352 
nvmet_rdma_free_cmd(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * c,bool admin)353 static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
354 		struct nvmet_rdma_cmd *c, bool admin)
355 {
356 	if (!admin)
357 		nvmet_rdma_free_inline_pages(ndev, c);
358 	ib_dma_unmap_single(ndev->device, c->sge[0].addr,
359 				sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
360 	kfree(c->nvme_cmd);
361 }
362 
363 static struct nvmet_rdma_cmd *
nvmet_rdma_alloc_cmds(struct nvmet_rdma_device * ndev,int nr_cmds,bool admin)364 nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
365 		int nr_cmds, bool admin)
366 {
367 	struct nvmet_rdma_cmd *cmds;
368 	int ret = -EINVAL, i;
369 
370 	cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
371 	if (!cmds)
372 		goto out;
373 
374 	for (i = 0; i < nr_cmds; i++) {
375 		ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
376 		if (ret)
377 			goto out_free;
378 	}
379 
380 	return cmds;
381 
382 out_free:
383 	while (--i >= 0)
384 		nvmet_rdma_free_cmd(ndev, cmds + i, admin);
385 	kfree(cmds);
386 out:
387 	return ERR_PTR(ret);
388 }
389 
nvmet_rdma_free_cmds(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * cmds,int nr_cmds,bool admin)390 static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
391 		struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
392 {
393 	int i;
394 
395 	for (i = 0; i < nr_cmds; i++)
396 		nvmet_rdma_free_cmd(ndev, cmds + i, admin);
397 	kfree(cmds);
398 }
399 
nvmet_rdma_alloc_rsp(struct nvmet_rdma_device * ndev,struct nvmet_rdma_rsp * r,int tag)400 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
401 		struct nvmet_rdma_rsp *r, int tag)
402 {
403 	/* NVMe CQE / RDMA SEND */
404 	r->req.cqe = kmalloc(sizeof(*r->req.cqe), GFP_KERNEL);
405 	if (!r->req.cqe)
406 		goto out;
407 
408 	r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.cqe,
409 			sizeof(*r->req.cqe), DMA_TO_DEVICE);
410 	if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
411 		goto out_free_rsp;
412 
413 	if (ib_dma_pci_p2p_dma_supported(ndev->device))
414 		r->req.p2p_client = &ndev->device->dev;
415 	r->send_sge.length = sizeof(*r->req.cqe);
416 	r->send_sge.lkey = ndev->pd->local_dma_lkey;
417 
418 	r->send_cqe.done = nvmet_rdma_send_done;
419 
420 	r->send_wr.wr_cqe = &r->send_cqe;
421 	r->send_wr.sg_list = &r->send_sge;
422 	r->send_wr.num_sge = 1;
423 	r->send_wr.send_flags = IB_SEND_SIGNALED;
424 
425 	/* Data In / RDMA READ */
426 	r->read_cqe.done = nvmet_rdma_read_data_done;
427 	/* Data Out / RDMA WRITE */
428 	r->write_cqe.done = nvmet_rdma_write_data_done;
429 	r->tag = tag;
430 
431 	return 0;
432 
433 out_free_rsp:
434 	kfree(r->req.cqe);
435 out:
436 	return -ENOMEM;
437 }
438 
nvmet_rdma_free_rsp(struct nvmet_rdma_device * ndev,struct nvmet_rdma_rsp * r)439 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
440 		struct nvmet_rdma_rsp *r)
441 {
442 	ib_dma_unmap_single(ndev->device, r->send_sge.addr,
443 				sizeof(*r->req.cqe), DMA_TO_DEVICE);
444 	kfree(r->req.cqe);
445 }
446 
447 static int
nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue * queue)448 nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
449 {
450 	struct nvmet_rdma_device *ndev = queue->dev;
451 	int nr_rsps = queue->recv_queue_size * 2;
452 	int ret = -ENOMEM, i;
453 
454 	if (sbitmap_init_node(&queue->rsp_tags, nr_rsps, -1, GFP_KERNEL,
455 			NUMA_NO_NODE, false, true))
456 		goto out;
457 
458 	queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
459 			GFP_KERNEL);
460 	if (!queue->rsps)
461 		goto out_free_sbitmap;
462 
463 	for (i = 0; i < nr_rsps; i++) {
464 		struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
465 
466 		ret = nvmet_rdma_alloc_rsp(ndev, rsp, i);
467 		if (ret)
468 			goto out_free;
469 	}
470 
471 	return 0;
472 
473 out_free:
474 	while (--i >= 0)
475 		nvmet_rdma_free_rsp(ndev, &queue->rsps[i]);
476 	kfree(queue->rsps);
477 out_free_sbitmap:
478 	sbitmap_free(&queue->rsp_tags);
479 out:
480 	return ret;
481 }
482 
nvmet_rdma_free_rsps(struct nvmet_rdma_queue * queue)483 static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
484 {
485 	struct nvmet_rdma_device *ndev = queue->dev;
486 	int i, nr_rsps = queue->recv_queue_size * 2;
487 
488 	for (i = 0; i < nr_rsps; i++)
489 		nvmet_rdma_free_rsp(ndev, &queue->rsps[i]);
490 	kfree(queue->rsps);
491 	sbitmap_free(&queue->rsp_tags);
492 }
493 
nvmet_rdma_post_recv(struct nvmet_rdma_device * ndev,struct nvmet_rdma_cmd * cmd)494 static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
495 		struct nvmet_rdma_cmd *cmd)
496 {
497 	int ret;
498 
499 	ib_dma_sync_single_for_device(ndev->device,
500 		cmd->sge[0].addr, cmd->sge[0].length,
501 		DMA_FROM_DEVICE);
502 
503 	if (cmd->nsrq)
504 		ret = ib_post_srq_recv(cmd->nsrq->srq, &cmd->wr, NULL);
505 	else
506 		ret = ib_post_recv(cmd->queue->qp, &cmd->wr, NULL);
507 
508 	if (unlikely(ret))
509 		pr_err("post_recv cmd failed\n");
510 
511 	return ret;
512 }
513 
nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue * queue)514 static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
515 {
516 	spin_lock(&queue->rsp_wr_wait_lock);
517 	while (!list_empty(&queue->rsp_wr_wait_list)) {
518 		struct nvmet_rdma_rsp *rsp;
519 		bool ret;
520 
521 		rsp = list_entry(queue->rsp_wr_wait_list.next,
522 				struct nvmet_rdma_rsp, wait_list);
523 		list_del(&rsp->wait_list);
524 
525 		spin_unlock(&queue->rsp_wr_wait_lock);
526 		ret = nvmet_rdma_execute_command(rsp);
527 		spin_lock(&queue->rsp_wr_wait_lock);
528 
529 		if (!ret) {
530 			list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
531 			break;
532 		}
533 	}
534 	spin_unlock(&queue->rsp_wr_wait_lock);
535 }
536 
nvmet_rdma_check_pi_status(struct ib_mr * sig_mr)537 static u16 nvmet_rdma_check_pi_status(struct ib_mr *sig_mr)
538 {
539 	struct ib_mr_status mr_status;
540 	int ret;
541 	u16 status = 0;
542 
543 	ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
544 	if (ret) {
545 		pr_err("ib_check_mr_status failed, ret %d\n", ret);
546 		return NVME_SC_INVALID_PI;
547 	}
548 
549 	if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
550 		switch (mr_status.sig_err.err_type) {
551 		case IB_SIG_BAD_GUARD:
552 			status = NVME_SC_GUARD_CHECK;
553 			break;
554 		case IB_SIG_BAD_REFTAG:
555 			status = NVME_SC_REFTAG_CHECK;
556 			break;
557 		case IB_SIG_BAD_APPTAG:
558 			status = NVME_SC_APPTAG_CHECK;
559 			break;
560 		}
561 		pr_err("PI error found type %d expected 0x%x vs actual 0x%x\n",
562 		       mr_status.sig_err.err_type,
563 		       mr_status.sig_err.expected,
564 		       mr_status.sig_err.actual);
565 	}
566 
567 	return status;
568 }
569 
nvmet_rdma_set_sig_domain(struct blk_integrity * bi,struct nvme_command * cmd,struct ib_sig_domain * domain,u16 control,u8 pi_type)570 static void nvmet_rdma_set_sig_domain(struct blk_integrity *bi,
571 		struct nvme_command *cmd, struct ib_sig_domain *domain,
572 		u16 control, u8 pi_type)
573 {
574 	domain->sig_type = IB_SIG_TYPE_T10_DIF;
575 	domain->sig.dif.bg_type = IB_T10DIF_CRC;
576 	domain->sig.dif.pi_interval = 1 << bi->interval_exp;
577 	domain->sig.dif.ref_tag = le32_to_cpu(cmd->rw.reftag);
578 	if (control & NVME_RW_PRINFO_PRCHK_REF)
579 		domain->sig.dif.ref_remap = true;
580 
581 	domain->sig.dif.app_tag = le16_to_cpu(cmd->rw.lbat);
582 	domain->sig.dif.apptag_check_mask = le16_to_cpu(cmd->rw.lbatm);
583 	domain->sig.dif.app_escape = true;
584 	if (pi_type == NVME_NS_DPS_PI_TYPE3)
585 		domain->sig.dif.ref_escape = true;
586 }
587 
nvmet_rdma_set_sig_attrs(struct nvmet_req * req,struct ib_sig_attrs * sig_attrs)588 static void nvmet_rdma_set_sig_attrs(struct nvmet_req *req,
589 				     struct ib_sig_attrs *sig_attrs)
590 {
591 	struct nvme_command *cmd = req->cmd;
592 	u16 control = le16_to_cpu(cmd->rw.control);
593 	u8 pi_type = req->ns->pi_type;
594 	struct blk_integrity *bi;
595 
596 	bi = bdev_get_integrity(req->ns->bdev);
597 
598 	memset(sig_attrs, 0, sizeof(*sig_attrs));
599 
600 	if (control & NVME_RW_PRINFO_PRACT) {
601 		/* for WRITE_INSERT/READ_STRIP no wire domain */
602 		sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
603 		nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
604 					  pi_type);
605 		/* Clear the PRACT bit since HCA will generate/verify the PI */
606 		control &= ~NVME_RW_PRINFO_PRACT;
607 		cmd->rw.control = cpu_to_le16(control);
608 		/* PI is added by the HW */
609 		req->transfer_len += req->metadata_len;
610 	} else {
611 		/* for WRITE_PASS/READ_PASS both wire/memory domains exist */
612 		nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control,
613 					  pi_type);
614 		nvmet_rdma_set_sig_domain(bi, cmd, &sig_attrs->mem, control,
615 					  pi_type);
616 	}
617 
618 	if (control & NVME_RW_PRINFO_PRCHK_REF)
619 		sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
620 	if (control & NVME_RW_PRINFO_PRCHK_GUARD)
621 		sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
622 	if (control & NVME_RW_PRINFO_PRCHK_APP)
623 		sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
624 }
625 
nvmet_rdma_rw_ctx_init(struct nvmet_rdma_rsp * rsp,u64 addr,u32 key,struct ib_sig_attrs * sig_attrs)626 static int nvmet_rdma_rw_ctx_init(struct nvmet_rdma_rsp *rsp, u64 addr, u32 key,
627 				  struct ib_sig_attrs *sig_attrs)
628 {
629 	struct rdma_cm_id *cm_id = rsp->queue->cm_id;
630 	struct nvmet_req *req = &rsp->req;
631 	int ret;
632 
633 	if (req->metadata_len)
634 		ret = rdma_rw_ctx_signature_init(&rsp->rw, cm_id->qp,
635 			cm_id->port_num, req->sg, req->sg_cnt,
636 			req->metadata_sg, req->metadata_sg_cnt, sig_attrs,
637 			addr, key, nvmet_data_dir(req));
638 	else
639 		ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
640 				       req->sg, req->sg_cnt, 0, addr, key,
641 				       nvmet_data_dir(req));
642 
643 	return ret;
644 }
645 
nvmet_rdma_rw_ctx_destroy(struct nvmet_rdma_rsp * rsp)646 static void nvmet_rdma_rw_ctx_destroy(struct nvmet_rdma_rsp *rsp)
647 {
648 	struct rdma_cm_id *cm_id = rsp->queue->cm_id;
649 	struct nvmet_req *req = &rsp->req;
650 
651 	if (req->metadata_len)
652 		rdma_rw_ctx_destroy_signature(&rsp->rw, cm_id->qp,
653 			cm_id->port_num, req->sg, req->sg_cnt,
654 			req->metadata_sg, req->metadata_sg_cnt,
655 			nvmet_data_dir(req));
656 	else
657 		rdma_rw_ctx_destroy(&rsp->rw, cm_id->qp, cm_id->port_num,
658 				    req->sg, req->sg_cnt, nvmet_data_dir(req));
659 }
660 
nvmet_rdma_release_rsp(struct nvmet_rdma_rsp * rsp)661 static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
662 {
663 	struct nvmet_rdma_queue *queue = rsp->queue;
664 
665 	atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
666 
667 	if (rsp->n_rdma)
668 		nvmet_rdma_rw_ctx_destroy(rsp);
669 
670 	if (rsp->req.sg != rsp->cmd->inline_sg)
671 		nvmet_req_free_sgls(&rsp->req);
672 
673 	if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
674 		nvmet_rdma_process_wr_wait_list(queue);
675 
676 	nvmet_rdma_put_rsp(rsp);
677 }
678 
nvmet_rdma_error_comp(struct nvmet_rdma_queue * queue)679 static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
680 {
681 	if (queue->nvme_sq.ctrl) {
682 		nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
683 	} else {
684 		/*
685 		 * we didn't setup the controller yet in case
686 		 * of admin connect error, just disconnect and
687 		 * cleanup the queue
688 		 */
689 		nvmet_rdma_queue_disconnect(queue);
690 	}
691 }
692 
nvmet_rdma_send_done(struct ib_cq * cq,struct ib_wc * wc)693 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
694 {
695 	struct nvmet_rdma_rsp *rsp =
696 		container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
697 	struct nvmet_rdma_queue *queue = wc->qp->qp_context;
698 
699 	nvmet_rdma_release_rsp(rsp);
700 
701 	if (unlikely(wc->status != IB_WC_SUCCESS &&
702 		     wc->status != IB_WC_WR_FLUSH_ERR)) {
703 		pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
704 			wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
705 		nvmet_rdma_error_comp(queue);
706 	}
707 }
708 
nvmet_rdma_queue_response(struct nvmet_req * req)709 static void nvmet_rdma_queue_response(struct nvmet_req *req)
710 {
711 	struct nvmet_rdma_rsp *rsp =
712 		container_of(req, struct nvmet_rdma_rsp, req);
713 	struct rdma_cm_id *cm_id = rsp->queue->cm_id;
714 	struct ib_send_wr *first_wr;
715 
716 	if (rsp->invalidate_rkey) {
717 		rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
718 		rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
719 	} else {
720 		rsp->send_wr.opcode = IB_WR_SEND;
721 	}
722 
723 	if (nvmet_rdma_need_data_out(rsp)) {
724 		if (rsp->req.metadata_len)
725 			first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
726 					cm_id->port_num, &rsp->write_cqe, NULL);
727 		else
728 			first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
729 					cm_id->port_num, NULL, &rsp->send_wr);
730 	} else {
731 		first_wr = &rsp->send_wr;
732 	}
733 
734 	nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
735 
736 	ib_dma_sync_single_for_device(rsp->queue->dev->device,
737 		rsp->send_sge.addr, rsp->send_sge.length,
738 		DMA_TO_DEVICE);
739 
740 	if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) {
741 		pr_err("sending cmd response failed\n");
742 		nvmet_rdma_release_rsp(rsp);
743 	}
744 }
745 
nvmet_rdma_read_data_done(struct ib_cq * cq,struct ib_wc * wc)746 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
747 {
748 	struct nvmet_rdma_rsp *rsp =
749 		container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
750 	struct nvmet_rdma_queue *queue = wc->qp->qp_context;
751 	u16 status = 0;
752 
753 	WARN_ON(rsp->n_rdma <= 0);
754 	atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
755 	rsp->n_rdma = 0;
756 
757 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
758 		nvmet_rdma_rw_ctx_destroy(rsp);
759 		nvmet_req_uninit(&rsp->req);
760 		nvmet_rdma_release_rsp(rsp);
761 		if (wc->status != IB_WC_WR_FLUSH_ERR) {
762 			pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
763 				wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
764 			nvmet_rdma_error_comp(queue);
765 		}
766 		return;
767 	}
768 
769 	if (rsp->req.metadata_len)
770 		status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr);
771 	nvmet_rdma_rw_ctx_destroy(rsp);
772 
773 	if (unlikely(status))
774 		nvmet_req_complete(&rsp->req, status);
775 	else
776 		rsp->req.execute(&rsp->req);
777 }
778 
nvmet_rdma_write_data_done(struct ib_cq * cq,struct ib_wc * wc)779 static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc)
780 {
781 	struct nvmet_rdma_rsp *rsp =
782 		container_of(wc->wr_cqe, struct nvmet_rdma_rsp, write_cqe);
783 	struct nvmet_rdma_queue *queue = wc->qp->qp_context;
784 	struct rdma_cm_id *cm_id = rsp->queue->cm_id;
785 	u16 status;
786 
787 	if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
788 		return;
789 
790 	WARN_ON(rsp->n_rdma <= 0);
791 	atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
792 	rsp->n_rdma = 0;
793 
794 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
795 		nvmet_rdma_rw_ctx_destroy(rsp);
796 		nvmet_req_uninit(&rsp->req);
797 		nvmet_rdma_release_rsp(rsp);
798 		if (wc->status != IB_WC_WR_FLUSH_ERR) {
799 			pr_info("RDMA WRITE for CQE failed with status %s (%d).\n",
800 				ib_wc_status_msg(wc->status), wc->status);
801 			nvmet_rdma_error_comp(queue);
802 		}
803 		return;
804 	}
805 
806 	/*
807 	 * Upon RDMA completion check the signature status
808 	 * - if succeeded send good NVMe response
809 	 * - if failed send bad NVMe response with appropriate error
810 	 */
811 	status = nvmet_rdma_check_pi_status(rsp->rw.reg->mr);
812 	if (unlikely(status))
813 		rsp->req.cqe->status = cpu_to_le16(status << 1);
814 	nvmet_rdma_rw_ctx_destroy(rsp);
815 
816 	if (unlikely(ib_post_send(cm_id->qp, &rsp->send_wr, NULL))) {
817 		pr_err("sending cmd response failed\n");
818 		nvmet_rdma_release_rsp(rsp);
819 	}
820 }
821 
nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp * rsp,u32 len,u64 off)822 static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
823 		u64 off)
824 {
825 	int sg_count = num_pages(len);
826 	struct scatterlist *sg;
827 	int i;
828 
829 	sg = rsp->cmd->inline_sg;
830 	for (i = 0; i < sg_count; i++, sg++) {
831 		if (i < sg_count - 1)
832 			sg_unmark_end(sg);
833 		else
834 			sg_mark_end(sg);
835 		sg->offset = off;
836 		sg->length = min_t(int, len, PAGE_SIZE - off);
837 		len -= sg->length;
838 		if (!i)
839 			off = 0;
840 	}
841 
842 	rsp->req.sg = rsp->cmd->inline_sg;
843 	rsp->req.sg_cnt = sg_count;
844 }
845 
nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp * rsp)846 static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
847 {
848 	struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
849 	u64 off = le64_to_cpu(sgl->addr);
850 	u32 len = le32_to_cpu(sgl->length);
851 
852 	if (!nvme_is_write(rsp->req.cmd)) {
853 		rsp->req.error_loc =
854 			offsetof(struct nvme_common_command, opcode);
855 		return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
856 	}
857 
858 	if (off + len > rsp->queue->dev->inline_data_size) {
859 		pr_err("invalid inline data offset!\n");
860 		return NVME_SC_SGL_INVALID_OFFSET | NVME_STATUS_DNR;
861 	}
862 
863 	/* no data command? */
864 	if (!len)
865 		return 0;
866 
867 	nvmet_rdma_use_inline_sg(rsp, len, off);
868 	rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
869 	rsp->req.transfer_len += len;
870 	return 0;
871 }
872 
nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp * rsp,struct nvme_keyed_sgl_desc * sgl,bool invalidate)873 static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
874 		struct nvme_keyed_sgl_desc *sgl, bool invalidate)
875 {
876 	u64 addr = le64_to_cpu(sgl->addr);
877 	u32 key = get_unaligned_le32(sgl->key);
878 	struct ib_sig_attrs sig_attrs;
879 	int ret;
880 
881 	rsp->req.transfer_len = get_unaligned_le24(sgl->length);
882 
883 	/* no data command? */
884 	if (!rsp->req.transfer_len)
885 		return 0;
886 
887 	if (rsp->req.metadata_len)
888 		nvmet_rdma_set_sig_attrs(&rsp->req, &sig_attrs);
889 
890 	ret = nvmet_req_alloc_sgls(&rsp->req);
891 	if (unlikely(ret < 0))
892 		goto error_out;
893 
894 	ret = nvmet_rdma_rw_ctx_init(rsp, addr, key, &sig_attrs);
895 	if (unlikely(ret < 0))
896 		goto error_out;
897 	rsp->n_rdma += ret;
898 
899 	if (invalidate)
900 		rsp->invalidate_rkey = key;
901 
902 	return 0;
903 
904 error_out:
905 	rsp->req.transfer_len = 0;
906 	return NVME_SC_INTERNAL;
907 }
908 
nvmet_rdma_map_sgl(struct nvmet_rdma_rsp * rsp)909 static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
910 {
911 	struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
912 
913 	switch (sgl->type >> 4) {
914 	case NVME_SGL_FMT_DATA_DESC:
915 		switch (sgl->type & 0xf) {
916 		case NVME_SGL_FMT_OFFSET:
917 			return nvmet_rdma_map_sgl_inline(rsp);
918 		default:
919 			pr_err("invalid SGL subtype: %#x\n", sgl->type);
920 			rsp->req.error_loc =
921 				offsetof(struct nvme_common_command, dptr);
922 			return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
923 		}
924 	case NVME_KEY_SGL_FMT_DATA_DESC:
925 		switch (sgl->type & 0xf) {
926 		case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
927 			return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
928 		case NVME_SGL_FMT_ADDRESS:
929 			return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
930 		default:
931 			pr_err("invalid SGL subtype: %#x\n", sgl->type);
932 			rsp->req.error_loc =
933 				offsetof(struct nvme_common_command, dptr);
934 			return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
935 		}
936 	default:
937 		pr_err("invalid SGL type: %#x\n", sgl->type);
938 		rsp->req.error_loc = offsetof(struct nvme_common_command, dptr);
939 		return NVME_SC_SGL_INVALID_TYPE | NVME_STATUS_DNR;
940 	}
941 }
942 
nvmet_rdma_execute_command(struct nvmet_rdma_rsp * rsp)943 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
944 {
945 	struct nvmet_rdma_queue *queue = rsp->queue;
946 
947 	if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
948 			&queue->sq_wr_avail) < 0)) {
949 		pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
950 				1 + rsp->n_rdma, queue->idx,
951 				queue->nvme_sq.ctrl->cntlid);
952 		atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
953 		return false;
954 	}
955 
956 	if (nvmet_rdma_need_data_in(rsp)) {
957 		if (rdma_rw_ctx_post(&rsp->rw, queue->qp,
958 				queue->cm_id->port_num, &rsp->read_cqe, NULL))
959 			nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
960 	} else {
961 		rsp->req.execute(&rsp->req);
962 	}
963 
964 	return true;
965 }
966 
nvmet_rdma_handle_command(struct nvmet_rdma_queue * queue,struct nvmet_rdma_rsp * cmd)967 static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
968 		struct nvmet_rdma_rsp *cmd)
969 {
970 	u16 status;
971 
972 	ib_dma_sync_single_for_cpu(queue->dev->device,
973 		cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
974 		DMA_FROM_DEVICE);
975 	ib_dma_sync_single_for_cpu(queue->dev->device,
976 		cmd->send_sge.addr, cmd->send_sge.length,
977 		DMA_TO_DEVICE);
978 
979 	if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
980 			&queue->nvme_sq, &nvmet_rdma_ops))
981 		return;
982 
983 	status = nvmet_rdma_map_sgl(cmd);
984 	if (status)
985 		goto out_err;
986 
987 	if (unlikely(!nvmet_rdma_execute_command(cmd))) {
988 		spin_lock(&queue->rsp_wr_wait_lock);
989 		list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
990 		spin_unlock(&queue->rsp_wr_wait_lock);
991 	}
992 
993 	return;
994 
995 out_err:
996 	nvmet_req_complete(&cmd->req, status);
997 }
998 
nvmet_rdma_recv_not_live(struct nvmet_rdma_queue * queue,struct nvmet_rdma_rsp * rsp)999 static bool nvmet_rdma_recv_not_live(struct nvmet_rdma_queue *queue,
1000 		struct nvmet_rdma_rsp *rsp)
1001 {
1002 	unsigned long flags;
1003 	bool ret = true;
1004 
1005 	spin_lock_irqsave(&queue->state_lock, flags);
1006 	/*
1007 	 * recheck queue state is not live to prevent a race condition
1008 	 * with RDMA_CM_EVENT_ESTABLISHED handler.
1009 	 */
1010 	if (queue->state == NVMET_RDMA_Q_LIVE)
1011 		ret = false;
1012 	else if (queue->state == NVMET_RDMA_Q_CONNECTING)
1013 		list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
1014 	else
1015 		nvmet_rdma_put_rsp(rsp);
1016 	spin_unlock_irqrestore(&queue->state_lock, flags);
1017 	return ret;
1018 }
1019 
nvmet_rdma_recv_done(struct ib_cq * cq,struct ib_wc * wc)1020 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1021 {
1022 	struct nvmet_rdma_cmd *cmd =
1023 		container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
1024 	struct nvmet_rdma_queue *queue = wc->qp->qp_context;
1025 	struct nvmet_rdma_rsp *rsp;
1026 
1027 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1028 		if (wc->status != IB_WC_WR_FLUSH_ERR) {
1029 			pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
1030 				wc->wr_cqe, ib_wc_status_msg(wc->status),
1031 				wc->status);
1032 			nvmet_rdma_error_comp(queue);
1033 		}
1034 		return;
1035 	}
1036 
1037 	if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
1038 		pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
1039 		nvmet_rdma_error_comp(queue);
1040 		return;
1041 	}
1042 
1043 	cmd->queue = queue;
1044 	rsp = nvmet_rdma_get_rsp(queue);
1045 	if (unlikely(!rsp)) {
1046 		/*
1047 		 * we get here only under memory pressure,
1048 		 * silently drop and have the host retry
1049 		 * as we can't even fail it.
1050 		 */
1051 		nvmet_rdma_post_recv(queue->dev, cmd);
1052 		return;
1053 	}
1054 	rsp->queue = queue;
1055 	rsp->cmd = cmd;
1056 	rsp->flags = 0;
1057 	rsp->req.cmd = cmd->nvme_cmd;
1058 	rsp->req.port = queue->port;
1059 	rsp->n_rdma = 0;
1060 	rsp->invalidate_rkey = 0;
1061 
1062 	if (unlikely(queue->state != NVMET_RDMA_Q_LIVE) &&
1063 	    nvmet_rdma_recv_not_live(queue, rsp))
1064 		return;
1065 
1066 	nvmet_rdma_handle_command(queue, rsp);
1067 }
1068 
nvmet_rdma_destroy_srq(struct nvmet_rdma_srq * nsrq)1069 static void nvmet_rdma_destroy_srq(struct nvmet_rdma_srq *nsrq)
1070 {
1071 	nvmet_rdma_free_cmds(nsrq->ndev, nsrq->cmds, nsrq->ndev->srq_size,
1072 			     false);
1073 	ib_destroy_srq(nsrq->srq);
1074 
1075 	kfree(nsrq);
1076 }
1077 
nvmet_rdma_destroy_srqs(struct nvmet_rdma_device * ndev)1078 static void nvmet_rdma_destroy_srqs(struct nvmet_rdma_device *ndev)
1079 {
1080 	int i;
1081 
1082 	if (!ndev->srqs)
1083 		return;
1084 
1085 	for (i = 0; i < ndev->srq_count; i++)
1086 		nvmet_rdma_destroy_srq(ndev->srqs[i]);
1087 
1088 	kfree(ndev->srqs);
1089 }
1090 
1091 static struct nvmet_rdma_srq *
nvmet_rdma_init_srq(struct nvmet_rdma_device * ndev)1092 nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
1093 {
1094 	struct ib_srq_init_attr srq_attr = { NULL, };
1095 	size_t srq_size = ndev->srq_size;
1096 	struct nvmet_rdma_srq *nsrq;
1097 	struct ib_srq *srq;
1098 	int ret, i;
1099 
1100 	nsrq = kzalloc(sizeof(*nsrq), GFP_KERNEL);
1101 	if (!nsrq)
1102 		return ERR_PTR(-ENOMEM);
1103 
1104 	srq_attr.attr.max_wr = srq_size;
1105 	srq_attr.attr.max_sge = 1 + ndev->inline_page_count;
1106 	srq_attr.attr.srq_limit = 0;
1107 	srq_attr.srq_type = IB_SRQT_BASIC;
1108 	srq = ib_create_srq(ndev->pd, &srq_attr);
1109 	if (IS_ERR(srq)) {
1110 		ret = PTR_ERR(srq);
1111 		goto out_free;
1112 	}
1113 
1114 	nsrq->cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
1115 	if (IS_ERR(nsrq->cmds)) {
1116 		ret = PTR_ERR(nsrq->cmds);
1117 		goto out_destroy_srq;
1118 	}
1119 
1120 	nsrq->srq = srq;
1121 	nsrq->ndev = ndev;
1122 
1123 	for (i = 0; i < srq_size; i++) {
1124 		nsrq->cmds[i].nsrq = nsrq;
1125 		ret = nvmet_rdma_post_recv(ndev, &nsrq->cmds[i]);
1126 		if (ret)
1127 			goto out_free_cmds;
1128 	}
1129 
1130 	return nsrq;
1131 
1132 out_free_cmds:
1133 	nvmet_rdma_free_cmds(ndev, nsrq->cmds, srq_size, false);
1134 out_destroy_srq:
1135 	ib_destroy_srq(srq);
1136 out_free:
1137 	kfree(nsrq);
1138 	return ERR_PTR(ret);
1139 }
1140 
nvmet_rdma_init_srqs(struct nvmet_rdma_device * ndev)1141 static int nvmet_rdma_init_srqs(struct nvmet_rdma_device *ndev)
1142 {
1143 	int i, ret;
1144 
1145 	if (!ndev->device->attrs.max_srq_wr || !ndev->device->attrs.max_srq) {
1146 		/*
1147 		 * If SRQs aren't supported we just go ahead and use normal
1148 		 * non-shared receive queues.
1149 		 */
1150 		pr_info("SRQ requested but not supported.\n");
1151 		return 0;
1152 	}
1153 
1154 	ndev->srq_size = min(ndev->device->attrs.max_srq_wr,
1155 			     nvmet_rdma_srq_size);
1156 	ndev->srq_count = min(ndev->device->num_comp_vectors,
1157 			      ndev->device->attrs.max_srq);
1158 
1159 	ndev->srqs = kcalloc(ndev->srq_count, sizeof(*ndev->srqs), GFP_KERNEL);
1160 	if (!ndev->srqs)
1161 		return -ENOMEM;
1162 
1163 	for (i = 0; i < ndev->srq_count; i++) {
1164 		ndev->srqs[i] = nvmet_rdma_init_srq(ndev);
1165 		if (IS_ERR(ndev->srqs[i])) {
1166 			ret = PTR_ERR(ndev->srqs[i]);
1167 			goto err_srq;
1168 		}
1169 	}
1170 
1171 	return 0;
1172 
1173 err_srq:
1174 	while (--i >= 0)
1175 		nvmet_rdma_destroy_srq(ndev->srqs[i]);
1176 	kfree(ndev->srqs);
1177 	return ret;
1178 }
1179 
nvmet_rdma_free_dev(struct kref * ref)1180 static void nvmet_rdma_free_dev(struct kref *ref)
1181 {
1182 	struct nvmet_rdma_device *ndev =
1183 		container_of(ref, struct nvmet_rdma_device, ref);
1184 
1185 	mutex_lock(&device_list_mutex);
1186 	list_del(&ndev->entry);
1187 	mutex_unlock(&device_list_mutex);
1188 
1189 	nvmet_rdma_destroy_srqs(ndev);
1190 	ib_dealloc_pd(ndev->pd);
1191 
1192 	kfree(ndev);
1193 }
1194 
1195 static struct nvmet_rdma_device *
nvmet_rdma_find_get_device(struct rdma_cm_id * cm_id)1196 nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
1197 {
1198 	struct nvmet_rdma_port *port = cm_id->context;
1199 	struct nvmet_port *nport = port->nport;
1200 	struct nvmet_rdma_device *ndev;
1201 	int inline_page_count;
1202 	int inline_sge_count;
1203 	int ret;
1204 
1205 	mutex_lock(&device_list_mutex);
1206 	list_for_each_entry(ndev, &device_list, entry) {
1207 		if (ndev->device->node_guid == cm_id->device->node_guid &&
1208 		    kref_get_unless_zero(&ndev->ref))
1209 			goto out_unlock;
1210 	}
1211 
1212 	ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
1213 	if (!ndev)
1214 		goto out_err;
1215 
1216 	inline_page_count = num_pages(nport->inline_data_size);
1217 	inline_sge_count = max(cm_id->device->attrs.max_sge_rd,
1218 				cm_id->device->attrs.max_recv_sge) - 1;
1219 	if (inline_page_count > inline_sge_count) {
1220 		pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n",
1221 			nport->inline_data_size, cm_id->device->name,
1222 			inline_sge_count * PAGE_SIZE);
1223 		nport->inline_data_size = inline_sge_count * PAGE_SIZE;
1224 		inline_page_count = inline_sge_count;
1225 	}
1226 	ndev->inline_data_size = nport->inline_data_size;
1227 	ndev->inline_page_count = inline_page_count;
1228 
1229 	if (nport->pi_enable && !(cm_id->device->attrs.kernel_cap_flags &
1230 				  IBK_INTEGRITY_HANDOVER)) {
1231 		pr_warn("T10-PI is not supported by device %s. Disabling it\n",
1232 			cm_id->device->name);
1233 		nport->pi_enable = false;
1234 	}
1235 
1236 	ndev->device = cm_id->device;
1237 	kref_init(&ndev->ref);
1238 
1239 	ndev->pd = ib_alloc_pd(ndev->device, 0);
1240 	if (IS_ERR(ndev->pd))
1241 		goto out_free_dev;
1242 
1243 	if (nvmet_rdma_use_srq) {
1244 		ret = nvmet_rdma_init_srqs(ndev);
1245 		if (ret)
1246 			goto out_free_pd;
1247 	}
1248 
1249 	list_add(&ndev->entry, &device_list);
1250 out_unlock:
1251 	mutex_unlock(&device_list_mutex);
1252 	pr_debug("added %s.\n", ndev->device->name);
1253 	return ndev;
1254 
1255 out_free_pd:
1256 	ib_dealloc_pd(ndev->pd);
1257 out_free_dev:
1258 	kfree(ndev);
1259 out_err:
1260 	mutex_unlock(&device_list_mutex);
1261 	return NULL;
1262 }
1263 
nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue * queue)1264 static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
1265 {
1266 	struct ib_qp_init_attr qp_attr = { };
1267 	struct nvmet_rdma_device *ndev = queue->dev;
1268 	int nr_cqe, ret, i, factor;
1269 
1270 	/*
1271 	 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
1272 	 */
1273 	nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
1274 
1275 	queue->cq = ib_cq_pool_get(ndev->device, nr_cqe + 1,
1276 				   queue->comp_vector, IB_POLL_WORKQUEUE);
1277 	if (IS_ERR(queue->cq)) {
1278 		ret = PTR_ERR(queue->cq);
1279 		pr_err("failed to create CQ cqe= %d ret= %d\n",
1280 		       nr_cqe + 1, ret);
1281 		goto out;
1282 	}
1283 
1284 	qp_attr.qp_context = queue;
1285 	qp_attr.event_handler = nvmet_rdma_qp_event;
1286 	qp_attr.send_cq = queue->cq;
1287 	qp_attr.recv_cq = queue->cq;
1288 	qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
1289 	qp_attr.qp_type = IB_QPT_RC;
1290 	/* +1 for drain */
1291 	qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
1292 	factor = rdma_rw_mr_factor(ndev->device, queue->cm_id->port_num,
1293 				   1 << NVMET_RDMA_MAX_MDTS);
1294 	qp_attr.cap.max_rdma_ctxs = queue->send_queue_size * factor;
1295 	qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
1296 					ndev->device->attrs.max_send_sge);
1297 
1298 	if (queue->nsrq) {
1299 		qp_attr.srq = queue->nsrq->srq;
1300 	} else {
1301 		/* +1 for drain */
1302 		qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
1303 		qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count;
1304 	}
1305 
1306 	if (queue->port->pi_enable && queue->host_qid)
1307 		qp_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
1308 
1309 	ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
1310 	if (ret) {
1311 		pr_err("failed to create_qp ret= %d\n", ret);
1312 		goto err_destroy_cq;
1313 	}
1314 	queue->qp = queue->cm_id->qp;
1315 
1316 	atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
1317 
1318 	pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1319 		 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
1320 		 qp_attr.cap.max_send_wr, queue->cm_id);
1321 
1322 	if (!queue->nsrq) {
1323 		for (i = 0; i < queue->recv_queue_size; i++) {
1324 			queue->cmds[i].queue = queue;
1325 			ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
1326 			if (ret)
1327 				goto err_destroy_qp;
1328 		}
1329 	}
1330 
1331 out:
1332 	return ret;
1333 
1334 err_destroy_qp:
1335 	rdma_destroy_qp(queue->cm_id);
1336 err_destroy_cq:
1337 	ib_cq_pool_put(queue->cq, nr_cqe + 1);
1338 	goto out;
1339 }
1340 
nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue * queue)1341 static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
1342 {
1343 	ib_drain_qp(queue->qp);
1344 	if (queue->cm_id)
1345 		rdma_destroy_id(queue->cm_id);
1346 	ib_destroy_qp(queue->qp);
1347 	ib_cq_pool_put(queue->cq, queue->recv_queue_size + 2 *
1348 		       queue->send_queue_size + 1);
1349 }
1350 
nvmet_rdma_free_queue(struct nvmet_rdma_queue * queue)1351 static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
1352 {
1353 	pr_debug("freeing queue %d\n", queue->idx);
1354 
1355 	nvmet_sq_destroy(&queue->nvme_sq);
1356 
1357 	nvmet_rdma_destroy_queue_ib(queue);
1358 	if (!queue->nsrq) {
1359 		nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1360 				queue->recv_queue_size,
1361 				!queue->host_qid);
1362 	}
1363 	nvmet_rdma_free_rsps(queue);
1364 	ida_free(&nvmet_rdma_queue_ida, queue->idx);
1365 	kfree(queue);
1366 }
1367 
nvmet_rdma_release_queue_work(struct work_struct * w)1368 static void nvmet_rdma_release_queue_work(struct work_struct *w)
1369 {
1370 	struct nvmet_rdma_queue *queue =
1371 		container_of(w, struct nvmet_rdma_queue, release_work);
1372 	struct nvmet_rdma_device *dev = queue->dev;
1373 
1374 	nvmet_rdma_free_queue(queue);
1375 
1376 	kref_put(&dev->ref, nvmet_rdma_free_dev);
1377 }
1378 
1379 static int
nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param * conn,struct nvmet_rdma_queue * queue)1380 nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
1381 				struct nvmet_rdma_queue *queue)
1382 {
1383 	struct nvme_rdma_cm_req *req;
1384 
1385 	req = (struct nvme_rdma_cm_req *)conn->private_data;
1386 	if (!req || conn->private_data_len == 0)
1387 		return NVME_RDMA_CM_INVALID_LEN;
1388 
1389 	if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1390 		return NVME_RDMA_CM_INVALID_RECFMT;
1391 
1392 	queue->host_qid = le16_to_cpu(req->qid);
1393 
1394 	/*
1395 	 * req->hsqsize corresponds to our recv queue size plus 1
1396 	 * req->hrqsize corresponds to our send queue size
1397 	 */
1398 	queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
1399 	queue->send_queue_size = le16_to_cpu(req->hrqsize);
1400 
1401 	if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH)
1402 		return NVME_RDMA_CM_INVALID_HSQSIZE;
1403 
1404 	/* XXX: Should we enforce some kind of max for IO queues? */
1405 
1406 	return 0;
1407 }
1408 
nvmet_rdma_cm_reject(struct rdma_cm_id * cm_id,enum nvme_rdma_cm_status status)1409 static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1410 				enum nvme_rdma_cm_status status)
1411 {
1412 	struct nvme_rdma_cm_rej rej;
1413 
1414 	pr_debug("rejecting connect request: status %d (%s)\n",
1415 		 status, nvme_rdma_cm_msg(status));
1416 
1417 	rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1418 	rej.sts = cpu_to_le16(status);
1419 
1420 	return rdma_reject(cm_id, (void *)&rej, sizeof(rej),
1421 			   IB_CM_REJ_CONSUMER_DEFINED);
1422 }
1423 
1424 static struct nvmet_rdma_queue *
nvmet_rdma_alloc_queue(struct nvmet_rdma_device * ndev,struct rdma_cm_id * cm_id,struct rdma_cm_event * event)1425 nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1426 		struct rdma_cm_id *cm_id,
1427 		struct rdma_cm_event *event)
1428 {
1429 	struct nvmet_rdma_port *port = cm_id->context;
1430 	struct nvmet_rdma_queue *queue;
1431 	int ret;
1432 
1433 	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1434 	if (!queue) {
1435 		ret = NVME_RDMA_CM_NO_RSC;
1436 		goto out_reject;
1437 	}
1438 
1439 	ret = nvmet_sq_init(&queue->nvme_sq);
1440 	if (ret) {
1441 		ret = NVME_RDMA_CM_NO_RSC;
1442 		goto out_free_queue;
1443 	}
1444 
1445 	ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1446 	if (ret)
1447 		goto out_destroy_sq;
1448 
1449 	/*
1450 	 * Schedules the actual release because calling rdma_destroy_id from
1451 	 * inside a CM callback would trigger a deadlock. (great API design..)
1452 	 */
1453 	INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1454 	queue->dev = ndev;
1455 	queue->cm_id = cm_id;
1456 	queue->port = port->nport;
1457 
1458 	spin_lock_init(&queue->state_lock);
1459 	queue->state = NVMET_RDMA_Q_CONNECTING;
1460 	INIT_LIST_HEAD(&queue->rsp_wait_list);
1461 	INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1462 	spin_lock_init(&queue->rsp_wr_wait_lock);
1463 	INIT_LIST_HEAD(&queue->queue_list);
1464 
1465 	queue->idx = ida_alloc(&nvmet_rdma_queue_ida, GFP_KERNEL);
1466 	if (queue->idx < 0) {
1467 		ret = NVME_RDMA_CM_NO_RSC;
1468 		goto out_destroy_sq;
1469 	}
1470 
1471 	/*
1472 	 * Spread the io queues across completion vectors,
1473 	 * but still keep all admin queues on vector 0.
1474 	 */
1475 	queue->comp_vector = !queue->host_qid ? 0 :
1476 		queue->idx % ndev->device->num_comp_vectors;
1477 
1478 
1479 	ret = nvmet_rdma_alloc_rsps(queue);
1480 	if (ret) {
1481 		ret = NVME_RDMA_CM_NO_RSC;
1482 		goto out_ida_remove;
1483 	}
1484 
1485 	if (ndev->srqs) {
1486 		queue->nsrq = ndev->srqs[queue->comp_vector % ndev->srq_count];
1487 	} else {
1488 		queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1489 				queue->recv_queue_size,
1490 				!queue->host_qid);
1491 		if (IS_ERR(queue->cmds)) {
1492 			ret = NVME_RDMA_CM_NO_RSC;
1493 			goto out_free_responses;
1494 		}
1495 	}
1496 
1497 	ret = nvmet_rdma_create_queue_ib(queue);
1498 	if (ret) {
1499 		pr_err("%s: creating RDMA queue failed (%d).\n",
1500 			__func__, ret);
1501 		ret = NVME_RDMA_CM_NO_RSC;
1502 		goto out_free_cmds;
1503 	}
1504 
1505 	return queue;
1506 
1507 out_free_cmds:
1508 	if (!queue->nsrq) {
1509 		nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1510 				queue->recv_queue_size,
1511 				!queue->host_qid);
1512 	}
1513 out_free_responses:
1514 	nvmet_rdma_free_rsps(queue);
1515 out_ida_remove:
1516 	ida_free(&nvmet_rdma_queue_ida, queue->idx);
1517 out_destroy_sq:
1518 	nvmet_sq_destroy(&queue->nvme_sq);
1519 out_free_queue:
1520 	kfree(queue);
1521 out_reject:
1522 	nvmet_rdma_cm_reject(cm_id, ret);
1523 	return NULL;
1524 }
1525 
nvmet_rdma_qp_event(struct ib_event * event,void * priv)1526 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1527 {
1528 	struct nvmet_rdma_queue *queue = priv;
1529 
1530 	switch (event->event) {
1531 	case IB_EVENT_COMM_EST:
1532 		rdma_notify(queue->cm_id, event->event);
1533 		break;
1534 	case IB_EVENT_QP_LAST_WQE_REACHED:
1535 		pr_debug("received last WQE reached event for queue=0x%p\n",
1536 			 queue);
1537 		break;
1538 	default:
1539 		pr_err("received IB QP event: %s (%d)\n",
1540 		       ib_event_msg(event->event), event->event);
1541 		break;
1542 	}
1543 }
1544 
nvmet_rdma_cm_accept(struct rdma_cm_id * cm_id,struct nvmet_rdma_queue * queue,struct rdma_conn_param * p)1545 static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1546 		struct nvmet_rdma_queue *queue,
1547 		struct rdma_conn_param *p)
1548 {
1549 	struct rdma_conn_param  param = { };
1550 	struct nvme_rdma_cm_rep priv = { };
1551 	int ret = -ENOMEM;
1552 
1553 	param.rnr_retry_count = 7;
1554 	param.flow_control = 1;
1555 	param.initiator_depth = min_t(u8, p->initiator_depth,
1556 		queue->dev->device->attrs.max_qp_init_rd_atom);
1557 	param.private_data = &priv;
1558 	param.private_data_len = sizeof(priv);
1559 	priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1560 	priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1561 
1562 	ret = rdma_accept(cm_id, &param);
1563 	if (ret)
1564 		pr_err("rdma_accept failed (error code = %d)\n", ret);
1565 
1566 	return ret;
1567 }
1568 
nvmet_rdma_queue_connect(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)1569 static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1570 		struct rdma_cm_event *event)
1571 {
1572 	struct nvmet_rdma_device *ndev;
1573 	struct nvmet_rdma_queue *queue;
1574 	int ret = -EINVAL;
1575 
1576 	ndev = nvmet_rdma_find_get_device(cm_id);
1577 	if (!ndev) {
1578 		nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1579 		return -ECONNREFUSED;
1580 	}
1581 
1582 	queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1583 	if (!queue) {
1584 		ret = -ENOMEM;
1585 		goto put_device;
1586 	}
1587 
1588 	if (queue->host_qid == 0) {
1589 		struct nvmet_rdma_queue *q;
1590 		int pending = 0;
1591 
1592 		/* Check for pending controller teardown */
1593 		mutex_lock(&nvmet_rdma_queue_mutex);
1594 		list_for_each_entry(q, &nvmet_rdma_queue_list, queue_list) {
1595 			if (q->nvme_sq.ctrl == queue->nvme_sq.ctrl &&
1596 			    q->state == NVMET_RDMA_Q_DISCONNECTING)
1597 				pending++;
1598 		}
1599 		mutex_unlock(&nvmet_rdma_queue_mutex);
1600 		if (pending > NVMET_RDMA_BACKLOG)
1601 			return NVME_SC_CONNECT_CTRL_BUSY;
1602 	}
1603 
1604 	ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1605 	if (ret) {
1606 		/*
1607 		 * Don't destroy the cm_id in free path, as we implicitly
1608 		 * destroy the cm_id here with non-zero ret code.
1609 		 */
1610 		queue->cm_id = NULL;
1611 		goto free_queue;
1612 	}
1613 
1614 	mutex_lock(&nvmet_rdma_queue_mutex);
1615 	list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1616 	mutex_unlock(&nvmet_rdma_queue_mutex);
1617 
1618 	return 0;
1619 
1620 free_queue:
1621 	nvmet_rdma_free_queue(queue);
1622 put_device:
1623 	kref_put(&ndev->ref, nvmet_rdma_free_dev);
1624 
1625 	return ret;
1626 }
1627 
nvmet_rdma_queue_established(struct nvmet_rdma_queue * queue)1628 static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1629 {
1630 	unsigned long flags;
1631 
1632 	spin_lock_irqsave(&queue->state_lock, flags);
1633 	if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1634 		pr_warn("trying to establish a connected queue\n");
1635 		goto out_unlock;
1636 	}
1637 	queue->state = NVMET_RDMA_Q_LIVE;
1638 
1639 	while (!list_empty(&queue->rsp_wait_list)) {
1640 		struct nvmet_rdma_rsp *cmd;
1641 
1642 		cmd = list_first_entry(&queue->rsp_wait_list,
1643 					struct nvmet_rdma_rsp, wait_list);
1644 		list_del(&cmd->wait_list);
1645 
1646 		spin_unlock_irqrestore(&queue->state_lock, flags);
1647 		nvmet_rdma_handle_command(queue, cmd);
1648 		spin_lock_irqsave(&queue->state_lock, flags);
1649 	}
1650 
1651 out_unlock:
1652 	spin_unlock_irqrestore(&queue->state_lock, flags);
1653 }
1654 
__nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue * queue)1655 static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1656 {
1657 	bool disconnect = false;
1658 	unsigned long flags;
1659 
1660 	pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1661 
1662 	spin_lock_irqsave(&queue->state_lock, flags);
1663 	switch (queue->state) {
1664 	case NVMET_RDMA_Q_CONNECTING:
1665 		while (!list_empty(&queue->rsp_wait_list)) {
1666 			struct nvmet_rdma_rsp *rsp;
1667 
1668 			rsp = list_first_entry(&queue->rsp_wait_list,
1669 					       struct nvmet_rdma_rsp,
1670 					       wait_list);
1671 			list_del(&rsp->wait_list);
1672 			nvmet_rdma_put_rsp(rsp);
1673 		}
1674 		fallthrough;
1675 	case NVMET_RDMA_Q_LIVE:
1676 		queue->state = NVMET_RDMA_Q_DISCONNECTING;
1677 		disconnect = true;
1678 		break;
1679 	case NVMET_RDMA_Q_DISCONNECTING:
1680 		break;
1681 	}
1682 	spin_unlock_irqrestore(&queue->state_lock, flags);
1683 
1684 	if (disconnect) {
1685 		rdma_disconnect(queue->cm_id);
1686 		queue_work(nvmet_wq, &queue->release_work);
1687 	}
1688 }
1689 
nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue * queue)1690 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1691 {
1692 	bool disconnect = false;
1693 
1694 	mutex_lock(&nvmet_rdma_queue_mutex);
1695 	if (!list_empty(&queue->queue_list)) {
1696 		list_del_init(&queue->queue_list);
1697 		disconnect = true;
1698 	}
1699 	mutex_unlock(&nvmet_rdma_queue_mutex);
1700 
1701 	if (disconnect)
1702 		__nvmet_rdma_queue_disconnect(queue);
1703 }
1704 
nvmet_rdma_queue_connect_fail(struct rdma_cm_id * cm_id,struct nvmet_rdma_queue * queue)1705 static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1706 		struct nvmet_rdma_queue *queue)
1707 {
1708 	WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1709 
1710 	mutex_lock(&nvmet_rdma_queue_mutex);
1711 	if (!list_empty(&queue->queue_list))
1712 		list_del_init(&queue->queue_list);
1713 	mutex_unlock(&nvmet_rdma_queue_mutex);
1714 
1715 	pr_err("failed to connect queue %d\n", queue->idx);
1716 	queue_work(nvmet_wq, &queue->release_work);
1717 }
1718 
1719 /**
1720  * nvmet_rdma_device_removal() - Handle RDMA device removal
1721  * @cm_id:	rdma_cm id, used for nvmet port
1722  * @queue:      nvmet rdma queue (cm id qp_context)
1723  *
1724  * DEVICE_REMOVAL event notifies us that the RDMA device is about
1725  * to unplug. Note that this event can be generated on a normal
1726  * queue cm_id and/or a device bound listener cm_id (where in this
1727  * case queue will be null).
1728  *
1729  * We registered an ib_client to handle device removal for queues,
1730  * so we only need to handle the listening port cm_ids. In this case
1731  * we nullify the priv to prevent double cm_id destruction and destroying
1732  * the cm_id implicitely by returning a non-zero rc to the callout.
1733  */
nvmet_rdma_device_removal(struct rdma_cm_id * cm_id,struct nvmet_rdma_queue * queue)1734 static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1735 		struct nvmet_rdma_queue *queue)
1736 {
1737 	struct nvmet_rdma_port *port;
1738 
1739 	if (queue) {
1740 		/*
1741 		 * This is a queue cm_id. we have registered
1742 		 * an ib_client to handle queues removal
1743 		 * so don't interfear and just return.
1744 		 */
1745 		return 0;
1746 	}
1747 
1748 	port = cm_id->context;
1749 
1750 	/*
1751 	 * This is a listener cm_id. Make sure that
1752 	 * future remove_port won't invoke a double
1753 	 * cm_id destroy. use atomic xchg to make sure
1754 	 * we don't compete with remove_port.
1755 	 */
1756 	if (xchg(&port->cm_id, NULL) != cm_id)
1757 		return 0;
1758 
1759 	/*
1760 	 * We need to return 1 so that the core will destroy
1761 	 * it's own ID.  What a great API design..
1762 	 */
1763 	return 1;
1764 }
1765 
nvmet_rdma_cm_handler(struct rdma_cm_id * cm_id,struct rdma_cm_event * event)1766 static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1767 		struct rdma_cm_event *event)
1768 {
1769 	struct nvmet_rdma_queue *queue = NULL;
1770 	int ret = 0;
1771 
1772 	if (cm_id->qp)
1773 		queue = cm_id->qp->qp_context;
1774 
1775 	pr_debug("%s (%d): status %d id %p\n",
1776 		rdma_event_msg(event->event), event->event,
1777 		event->status, cm_id);
1778 
1779 	switch (event->event) {
1780 	case RDMA_CM_EVENT_CONNECT_REQUEST:
1781 		ret = nvmet_rdma_queue_connect(cm_id, event);
1782 		break;
1783 	case RDMA_CM_EVENT_ESTABLISHED:
1784 		nvmet_rdma_queue_established(queue);
1785 		break;
1786 	case RDMA_CM_EVENT_ADDR_CHANGE:
1787 		if (!queue) {
1788 			struct nvmet_rdma_port *port = cm_id->context;
1789 
1790 			queue_delayed_work(nvmet_wq, &port->repair_work, 0);
1791 			break;
1792 		}
1793 		fallthrough;
1794 	case RDMA_CM_EVENT_DISCONNECTED:
1795 	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1796 		nvmet_rdma_queue_disconnect(queue);
1797 		break;
1798 	case RDMA_CM_EVENT_DEVICE_REMOVAL:
1799 		ret = nvmet_rdma_device_removal(cm_id, queue);
1800 		break;
1801 	case RDMA_CM_EVENT_REJECTED:
1802 		pr_debug("Connection rejected: %s\n",
1803 			 rdma_reject_msg(cm_id, event->status));
1804 		fallthrough;
1805 	case RDMA_CM_EVENT_UNREACHABLE:
1806 	case RDMA_CM_EVENT_CONNECT_ERROR:
1807 		nvmet_rdma_queue_connect_fail(cm_id, queue);
1808 		break;
1809 	default:
1810 		pr_err("received unrecognized RDMA CM event %d\n",
1811 			event->event);
1812 		break;
1813 	}
1814 
1815 	return ret;
1816 }
1817 
nvmet_rdma_delete_ctrl(struct nvmet_ctrl * ctrl)1818 static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1819 {
1820 	struct nvmet_rdma_queue *queue, *n;
1821 
1822 	mutex_lock(&nvmet_rdma_queue_mutex);
1823 	list_for_each_entry_safe(queue, n, &nvmet_rdma_queue_list, queue_list) {
1824 		if (queue->nvme_sq.ctrl != ctrl)
1825 			continue;
1826 		list_del_init(&queue->queue_list);
1827 		__nvmet_rdma_queue_disconnect(queue);
1828 	}
1829 	mutex_unlock(&nvmet_rdma_queue_mutex);
1830 }
1831 
nvmet_rdma_destroy_port_queues(struct nvmet_rdma_port * port)1832 static void nvmet_rdma_destroy_port_queues(struct nvmet_rdma_port *port)
1833 {
1834 	struct nvmet_rdma_queue *queue, *tmp;
1835 	struct nvmet_port *nport = port->nport;
1836 
1837 	mutex_lock(&nvmet_rdma_queue_mutex);
1838 	list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
1839 				 queue_list) {
1840 		if (queue->port != nport)
1841 			continue;
1842 
1843 		list_del_init(&queue->queue_list);
1844 		__nvmet_rdma_queue_disconnect(queue);
1845 	}
1846 	mutex_unlock(&nvmet_rdma_queue_mutex);
1847 }
1848 
nvmet_rdma_disable_port(struct nvmet_rdma_port * port)1849 static void nvmet_rdma_disable_port(struct nvmet_rdma_port *port)
1850 {
1851 	struct rdma_cm_id *cm_id = xchg(&port->cm_id, NULL);
1852 
1853 	if (cm_id)
1854 		rdma_destroy_id(cm_id);
1855 
1856 	/*
1857 	 * Destroy the remaining queues, which are not belong to any
1858 	 * controller yet. Do it here after the RDMA-CM was destroyed
1859 	 * guarantees that no new queue will be created.
1860 	 */
1861 	nvmet_rdma_destroy_port_queues(port);
1862 }
1863 
nvmet_rdma_enable_port(struct nvmet_rdma_port * port)1864 static int nvmet_rdma_enable_port(struct nvmet_rdma_port *port)
1865 {
1866 	struct sockaddr *addr = (struct sockaddr *)&port->addr;
1867 	struct rdma_cm_id *cm_id;
1868 	int ret;
1869 
1870 	cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1871 			RDMA_PS_TCP, IB_QPT_RC);
1872 	if (IS_ERR(cm_id)) {
1873 		pr_err("CM ID creation failed\n");
1874 		return PTR_ERR(cm_id);
1875 	}
1876 
1877 	/*
1878 	 * Allow both IPv4 and IPv6 sockets to bind a single port
1879 	 * at the same time.
1880 	 */
1881 	ret = rdma_set_afonly(cm_id, 1);
1882 	if (ret) {
1883 		pr_err("rdma_set_afonly failed (%d)\n", ret);
1884 		goto out_destroy_id;
1885 	}
1886 
1887 	ret = rdma_bind_addr(cm_id, addr);
1888 	if (ret) {
1889 		pr_err("binding CM ID to %pISpcs failed (%d)\n", addr, ret);
1890 		goto out_destroy_id;
1891 	}
1892 
1893 	ret = rdma_listen(cm_id, NVMET_RDMA_BACKLOG);
1894 	if (ret) {
1895 		pr_err("listening to %pISpcs failed (%d)\n", addr, ret);
1896 		goto out_destroy_id;
1897 	}
1898 
1899 	port->cm_id = cm_id;
1900 	return 0;
1901 
1902 out_destroy_id:
1903 	rdma_destroy_id(cm_id);
1904 	return ret;
1905 }
1906 
nvmet_rdma_repair_port_work(struct work_struct * w)1907 static void nvmet_rdma_repair_port_work(struct work_struct *w)
1908 {
1909 	struct nvmet_rdma_port *port = container_of(to_delayed_work(w),
1910 			struct nvmet_rdma_port, repair_work);
1911 	int ret;
1912 
1913 	nvmet_rdma_disable_port(port);
1914 	ret = nvmet_rdma_enable_port(port);
1915 	if (ret)
1916 		queue_delayed_work(nvmet_wq, &port->repair_work, 5 * HZ);
1917 }
1918 
nvmet_rdma_add_port(struct nvmet_port * nport)1919 static int nvmet_rdma_add_port(struct nvmet_port *nport)
1920 {
1921 	struct nvmet_rdma_port *port;
1922 	__kernel_sa_family_t af;
1923 	int ret;
1924 
1925 	port = kzalloc(sizeof(*port), GFP_KERNEL);
1926 	if (!port)
1927 		return -ENOMEM;
1928 
1929 	nport->priv = port;
1930 	port->nport = nport;
1931 	INIT_DELAYED_WORK(&port->repair_work, nvmet_rdma_repair_port_work);
1932 
1933 	switch (nport->disc_addr.adrfam) {
1934 	case NVMF_ADDR_FAMILY_IP4:
1935 		af = AF_INET;
1936 		break;
1937 	case NVMF_ADDR_FAMILY_IP6:
1938 		af = AF_INET6;
1939 		break;
1940 	default:
1941 		pr_err("address family %d not supported\n",
1942 			nport->disc_addr.adrfam);
1943 		ret = -EINVAL;
1944 		goto out_free_port;
1945 	}
1946 
1947 	if (nport->inline_data_size < 0) {
1948 		nport->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE;
1949 	} else if (nport->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) {
1950 		pr_warn("inline_data_size %u is too large, reducing to %u\n",
1951 			nport->inline_data_size,
1952 			NVMET_RDMA_MAX_INLINE_DATA_SIZE);
1953 		nport->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE;
1954 	}
1955 
1956 	if (nport->max_queue_size < 0) {
1957 		nport->max_queue_size = NVME_RDMA_DEFAULT_QUEUE_SIZE;
1958 	} else if (nport->max_queue_size > NVME_RDMA_MAX_QUEUE_SIZE) {
1959 		pr_warn("max_queue_size %u is too large, reducing to %u\n",
1960 			nport->max_queue_size, NVME_RDMA_MAX_QUEUE_SIZE);
1961 		nport->max_queue_size = NVME_RDMA_MAX_QUEUE_SIZE;
1962 	}
1963 
1964 	ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1965 			nport->disc_addr.trsvcid, &port->addr);
1966 	if (ret) {
1967 		pr_err("malformed ip/port passed: %s:%s\n",
1968 			nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1969 		goto out_free_port;
1970 	}
1971 
1972 	ret = nvmet_rdma_enable_port(port);
1973 	if (ret)
1974 		goto out_free_port;
1975 
1976 	pr_info("enabling port %d (%pISpcs)\n",
1977 		le16_to_cpu(nport->disc_addr.portid),
1978 		(struct sockaddr *)&port->addr);
1979 
1980 	return 0;
1981 
1982 out_free_port:
1983 	kfree(port);
1984 	return ret;
1985 }
1986 
nvmet_rdma_remove_port(struct nvmet_port * nport)1987 static void nvmet_rdma_remove_port(struct nvmet_port *nport)
1988 {
1989 	struct nvmet_rdma_port *port = nport->priv;
1990 
1991 	cancel_delayed_work_sync(&port->repair_work);
1992 	nvmet_rdma_disable_port(port);
1993 	kfree(port);
1994 }
1995 
nvmet_rdma_disc_port_addr(struct nvmet_req * req,struct nvmet_port * nport,char * traddr)1996 static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
1997 		struct nvmet_port *nport, char *traddr)
1998 {
1999 	struct nvmet_rdma_port *port = nport->priv;
2000 	struct rdma_cm_id *cm_id = port->cm_id;
2001 
2002 	if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) {
2003 		struct nvmet_rdma_rsp *rsp =
2004 			container_of(req, struct nvmet_rdma_rsp, req);
2005 		struct rdma_cm_id *req_cm_id = rsp->queue->cm_id;
2006 		struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr;
2007 
2008 		sprintf(traddr, "%pISc", addr);
2009 	} else {
2010 		memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
2011 	}
2012 }
2013 
nvmet_rdma_host_port_addr(struct nvmet_ctrl * ctrl,char * traddr,size_t traddr_len)2014 static ssize_t nvmet_rdma_host_port_addr(struct nvmet_ctrl *ctrl,
2015 		char *traddr, size_t traddr_len)
2016 {
2017 	struct nvmet_sq *nvme_sq = ctrl->sqs[0];
2018 	struct nvmet_rdma_queue *queue =
2019 		container_of(nvme_sq, struct nvmet_rdma_queue, nvme_sq);
2020 
2021 	return snprintf(traddr, traddr_len, "%pISc",
2022 			(struct sockaddr *)&queue->cm_id->route.addr.dst_addr);
2023 }
2024 
nvmet_rdma_get_mdts(const struct nvmet_ctrl * ctrl)2025 static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl)
2026 {
2027 	if (ctrl->pi_support)
2028 		return NVMET_RDMA_MAX_METADATA_MDTS;
2029 	return NVMET_RDMA_MAX_MDTS;
2030 }
2031 
nvmet_rdma_get_max_queue_size(const struct nvmet_ctrl * ctrl)2032 static u16 nvmet_rdma_get_max_queue_size(const struct nvmet_ctrl *ctrl)
2033 {
2034 	if (ctrl->pi_support)
2035 		return NVME_RDMA_MAX_METADATA_QUEUE_SIZE;
2036 	return NVME_RDMA_MAX_QUEUE_SIZE;
2037 }
2038 
2039 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
2040 	.owner			= THIS_MODULE,
2041 	.type			= NVMF_TRTYPE_RDMA,
2042 	.msdbd			= 1,
2043 	.flags			= NVMF_KEYED_SGLS | NVMF_METADATA_SUPPORTED,
2044 	.add_port		= nvmet_rdma_add_port,
2045 	.remove_port		= nvmet_rdma_remove_port,
2046 	.queue_response		= nvmet_rdma_queue_response,
2047 	.delete_ctrl		= nvmet_rdma_delete_ctrl,
2048 	.disc_traddr		= nvmet_rdma_disc_port_addr,
2049 	.host_traddr		= nvmet_rdma_host_port_addr,
2050 	.get_mdts		= nvmet_rdma_get_mdts,
2051 	.get_max_queue_size	= nvmet_rdma_get_max_queue_size,
2052 };
2053 
nvmet_rdma_remove_one(struct ib_device * ib_device,void * client_data)2054 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2055 {
2056 	struct nvmet_rdma_queue *queue, *tmp;
2057 	struct nvmet_rdma_device *ndev;
2058 	bool found = false;
2059 
2060 	mutex_lock(&device_list_mutex);
2061 	list_for_each_entry(ndev, &device_list, entry) {
2062 		if (ndev->device == ib_device) {
2063 			found = true;
2064 			break;
2065 		}
2066 	}
2067 	mutex_unlock(&device_list_mutex);
2068 
2069 	if (!found)
2070 		return;
2071 
2072 	/*
2073 	 * IB Device that is used by nvmet controllers is being removed,
2074 	 * delete all queues using this device.
2075 	 */
2076 	mutex_lock(&nvmet_rdma_queue_mutex);
2077 	list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
2078 				 queue_list) {
2079 		if (queue->dev->device != ib_device)
2080 			continue;
2081 
2082 		pr_info("Removing queue %d\n", queue->idx);
2083 		list_del_init(&queue->queue_list);
2084 		__nvmet_rdma_queue_disconnect(queue);
2085 	}
2086 	mutex_unlock(&nvmet_rdma_queue_mutex);
2087 
2088 	flush_workqueue(nvmet_wq);
2089 }
2090 
2091 static struct ib_client nvmet_rdma_ib_client = {
2092 	.name   = "nvmet_rdma",
2093 	.remove = nvmet_rdma_remove_one
2094 };
2095 
nvmet_rdma_init(void)2096 static int __init nvmet_rdma_init(void)
2097 {
2098 	int ret;
2099 
2100 	ret = ib_register_client(&nvmet_rdma_ib_client);
2101 	if (ret)
2102 		return ret;
2103 
2104 	ret = nvmet_register_transport(&nvmet_rdma_ops);
2105 	if (ret)
2106 		goto err_ib_client;
2107 
2108 	return 0;
2109 
2110 err_ib_client:
2111 	ib_unregister_client(&nvmet_rdma_ib_client);
2112 	return ret;
2113 }
2114 
nvmet_rdma_exit(void)2115 static void __exit nvmet_rdma_exit(void)
2116 {
2117 	nvmet_unregister_transport(&nvmet_rdma_ops);
2118 	ib_unregister_client(&nvmet_rdma_ib_client);
2119 	WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list));
2120 	ida_destroy(&nvmet_rdma_queue_ida);
2121 }
2122 
2123 module_init(nvmet_rdma_init);
2124 module_exit(nvmet_rdma_exit);
2125 
2126 MODULE_DESCRIPTION("NVMe target RDMA transport driver");
2127 MODULE_LICENSE("GPL v2");
2128 MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */
2129