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mic: vop: Fix use-after-free on remove
[linux/fpc-iii.git] / drivers / nvme / target / rdma.c
bloba884e3a0e8afee4cf0d6bf3b8a8848d1f659c7c0
1 /*
2 * NVMe over Fabrics RDMA target.
3 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 */
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/atomic.h>
16 #include <linux/ctype.h>
17 #include <linux/delay.h>
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/nvme.h>
22 #include <linux/slab.h>
23 #include <linux/string.h>
24 #include <linux/wait.h>
25 #include <linux/inet.h>
26 #include <asm/unaligned.h>
27
28 #include <rdma/ib_verbs.h>
29 #include <rdma/rdma_cm.h>
30 #include <rdma/rw.h>
31
32 #include <linux/nvme-rdma.h>
33 #include "nvmet.h"
34
35 /*
36 * We allow at least 1 page, up to 4 SGEs, and up to 16KB of inline data
37 */
38 #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE PAGE_SIZE
39 #define NVMET_RDMA_MAX_INLINE_SGE 4
40 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE max_t(int, SZ_16K, PAGE_SIZE)
41
42 struct nvmet_rdma_cmd {
43 struct ib_sge sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
44 struct ib_cqe cqe;
45 struct ib_recv_wr wr;
46 struct scatterlist inline_sg[NVMET_RDMA_MAX_INLINE_SGE];
47 struct nvme_command *nvme_cmd;
48 struct nvmet_rdma_queue *queue;
49 };
50
51 enum {
52 NVMET_RDMA_REQ_INLINE_DATA = (1 << 0),
53 NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1),
54 };
55
56 struct nvmet_rdma_rsp {
57 struct ib_sge send_sge;
58 struct ib_cqe send_cqe;
59 struct ib_send_wr send_wr;
60
61 struct nvmet_rdma_cmd *cmd;
62 struct nvmet_rdma_queue *queue;
63
64 struct ib_cqe read_cqe;
65 struct rdma_rw_ctx rw;
66
67 struct nvmet_req req;
68
69 bool allocated;
70 u8 n_rdma;
71 u32 flags;
72 u32 invalidate_rkey;
73
74 struct list_head wait_list;
75 struct list_head free_list;
76 };
77
78 enum nvmet_rdma_queue_state {
79 NVMET_RDMA_Q_CONNECTING,
80 NVMET_RDMA_Q_LIVE,
81 NVMET_RDMA_Q_DISCONNECTING,
82 };
83
84 struct nvmet_rdma_queue {
85 struct rdma_cm_id *cm_id;
86 struct nvmet_port *port;
87 struct ib_cq *cq;
88 atomic_t sq_wr_avail;
89 struct nvmet_rdma_device *dev;
90 spinlock_t state_lock;
91 enum nvmet_rdma_queue_state state;
92 struct nvmet_cq nvme_cq;
93 struct nvmet_sq nvme_sq;
94
95 struct nvmet_rdma_rsp *rsps;
96 struct list_head free_rsps;
97 spinlock_t rsps_lock;
98 struct nvmet_rdma_cmd *cmds;
99
100 struct work_struct release_work;
101 struct list_head rsp_wait_list;
102 struct list_head rsp_wr_wait_list;
103 spinlock_t rsp_wr_wait_lock;
104
105 int idx;
106 int host_qid;
107 int recv_queue_size;
108 int send_queue_size;
109
110 struct list_head queue_list;
111 };
112
113 struct nvmet_rdma_device {
114 struct ib_device *device;
115 struct ib_pd *pd;
116 struct ib_srq *srq;
117 struct nvmet_rdma_cmd *srq_cmds;
118 size_t srq_size;
119 struct kref ref;
120 struct list_head entry;
121 int inline_data_size;
122 int inline_page_count;
123 };
124
125 static bool nvmet_rdma_use_srq;
126 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
127 MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
128
129 static DEFINE_IDA(nvmet_rdma_queue_ida);
130 static LIST_HEAD(nvmet_rdma_queue_list);
131 static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
132
133 static LIST_HEAD(device_list);
134 static DEFINE_MUTEX(device_list_mutex);
135
136 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
137 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
138 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
139 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
140 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
141 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
142 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
143 struct nvmet_rdma_rsp *r);
144 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
145 struct nvmet_rdma_rsp *r);
146
147 static const struct nvmet_fabrics_ops nvmet_rdma_ops;
148
149 static int num_pages(int len)
150 {
151 return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT);
152 }
153
154 /* XXX: really should move to a generic header sooner or later.. */
155 static inline u32 get_unaligned_le24(const u8 *p)
156 {
157 return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16;
158 }
159
160 static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
161 {
162 return nvme_is_write(rsp->req.cmd) &&
163 rsp->req.transfer_len &&
164 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
165 }
166
167 static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
168 {
169 return !nvme_is_write(rsp->req.cmd) &&
170 rsp->req.transfer_len &&
171 !rsp->req.rsp->status &&
172 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
173 }
174
175 static inline struct nvmet_rdma_rsp *
176 nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
177 {
178 struct nvmet_rdma_rsp *rsp;
179 unsigned long flags;
180
181 spin_lock_irqsave(&queue->rsps_lock, flags);
182 rsp = list_first_entry_or_null(&queue->free_rsps,
183 struct nvmet_rdma_rsp, free_list);
184 if (likely(rsp))
185 list_del(&rsp->free_list);
186 spin_unlock_irqrestore(&queue->rsps_lock, flags);
187
188 if (unlikely(!rsp)) {
189 int ret;
190
191 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
192 if (unlikely(!rsp))
193 return NULL;
194 ret = nvmet_rdma_alloc_rsp(queue->dev, rsp);
195 if (unlikely(ret)) {
196 kfree(rsp);
197 return NULL;
198 }
199
200 rsp->allocated = true;
201 }
202
203 return rsp;
204 }
205
206 static inline void
207 nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
208 {
209 unsigned long flags;
210
211 if (unlikely(rsp->allocated)) {
212 nvmet_rdma_free_rsp(rsp->queue->dev, rsp);
213 kfree(rsp);
214 return;
215 }
216
217 spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
218 list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
219 spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
220 }
221
222 static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev,
223 struct nvmet_rdma_cmd *c)
224 {
225 struct scatterlist *sg;
226 struct ib_sge *sge;
227 int i;
228
229 if (!ndev->inline_data_size)
230 return;
231
232 sg = c->inline_sg;
233 sge = &c->sge[1];
234
235 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
236 if (sge->length)
237 ib_dma_unmap_page(ndev->device, sge->addr,
238 sge->length, DMA_FROM_DEVICE);
239 if (sg_page(sg))
240 __free_page(sg_page(sg));
241 }
242 }
243
244 static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev,
245 struct nvmet_rdma_cmd *c)
246 {
247 struct scatterlist *sg;
248 struct ib_sge *sge;
249 struct page *pg;
250 int len;
251 int i;
252
253 if (!ndev->inline_data_size)
254 return 0;
255
256 sg = c->inline_sg;
257 sg_init_table(sg, ndev->inline_page_count);
258 sge = &c->sge[1];
259 len = ndev->inline_data_size;
260
261 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
262 pg = alloc_page(GFP_KERNEL);
263 if (!pg)
264 goto out_err;
265 sg_assign_page(sg, pg);
266 sge->addr = ib_dma_map_page(ndev->device,
267 pg, 0, PAGE_SIZE, DMA_FROM_DEVICE);
268 if (ib_dma_mapping_error(ndev->device, sge->addr))
269 goto out_err;
270 sge->length = min_t(int, len, PAGE_SIZE);
271 sge->lkey = ndev->pd->local_dma_lkey;
272 len -= sge->length;
273 }
274
275 return 0;
276 out_err:
277 for (; i >= 0; i--, sg--, sge--) {
278 if (sge->length)
279 ib_dma_unmap_page(ndev->device, sge->addr,
280 sge->length, DMA_FROM_DEVICE);
281 if (sg_page(sg))
282 __free_page(sg_page(sg));
283 }
284 return -ENOMEM;
285 }
286
287 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
288 struct nvmet_rdma_cmd *c, bool admin)
289 {
290 /* NVMe command / RDMA RECV */
291 c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
292 if (!c->nvme_cmd)
293 goto out;
294
295 c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
296 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
297 if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
298 goto out_free_cmd;
299
300 c->sge[0].length = sizeof(*c->nvme_cmd);
301 c->sge[0].lkey = ndev->pd->local_dma_lkey;
302
303 if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c))
304 goto out_unmap_cmd;
305
306 c->cqe.done = nvmet_rdma_recv_done;
307
308 c->wr.wr_cqe = &c->cqe;
309 c->wr.sg_list = c->sge;
310 c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1;
311
312 return 0;
313
314 out_unmap_cmd:
315 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
316 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
317 out_free_cmd:
318 kfree(c->nvme_cmd);
319
320 out:
321 return -ENOMEM;
322 }
323
324 static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
325 struct nvmet_rdma_cmd *c, bool admin)
326 {
327 if (!admin)
328 nvmet_rdma_free_inline_pages(ndev, c);
329 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
330 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
331 kfree(c->nvme_cmd);
332 }
333
334 static struct nvmet_rdma_cmd *
335 nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
336 int nr_cmds, bool admin)
337 {
338 struct nvmet_rdma_cmd *cmds;
339 int ret = -EINVAL, i;
340
341 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
342 if (!cmds)
343 goto out;
344
345 for (i = 0; i < nr_cmds; i++) {
346 ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
347 if (ret)
348 goto out_free;
349 }
350
351 return cmds;
352
353 out_free:
354 while (--i >= 0)
355 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
356 kfree(cmds);
357 out:
358 return ERR_PTR(ret);
359 }
360
361 static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
362 struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
363 {
364 int i;
365
366 for (i = 0; i < nr_cmds; i++)
367 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
368 kfree(cmds);
369 }
370
371 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
372 struct nvmet_rdma_rsp *r)
373 {
374 /* NVMe CQE / RDMA SEND */
375 r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL);
376 if (!r->req.rsp)
377 goto out;
378
379 r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp,
380 sizeof(*r->req.rsp), DMA_TO_DEVICE);
381 if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
382 goto out_free_rsp;
383
384 r->send_sge.length = sizeof(*r->req.rsp);
385 r->send_sge.lkey = ndev->pd->local_dma_lkey;
386
387 r->send_cqe.done = nvmet_rdma_send_done;
388
389 r->send_wr.wr_cqe = &r->send_cqe;
390 r->send_wr.sg_list = &r->send_sge;
391 r->send_wr.num_sge = 1;
392 r->send_wr.send_flags = IB_SEND_SIGNALED;
393
394 /* Data In / RDMA READ */
395 r->read_cqe.done = nvmet_rdma_read_data_done;
396 return 0;
397
398 out_free_rsp:
399 kfree(r->req.rsp);
400 out:
401 return -ENOMEM;
402 }
403
404 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
405 struct nvmet_rdma_rsp *r)
406 {
407 ib_dma_unmap_single(ndev->device, r->send_sge.addr,
408 sizeof(*r->req.rsp), DMA_TO_DEVICE);
409 kfree(r->req.rsp);
410 }
411
412 static int
413 nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
414 {
415 struct nvmet_rdma_device *ndev = queue->dev;
416 int nr_rsps = queue->recv_queue_size * 2;
417 int ret = -EINVAL, i;
418
419 queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
420 GFP_KERNEL);
421 if (!queue->rsps)
422 goto out;
423
424 for (i = 0; i < nr_rsps; i++) {
425 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
426
427 ret = nvmet_rdma_alloc_rsp(ndev, rsp);
428 if (ret)
429 goto out_free;
430
431 list_add_tail(&rsp->free_list, &queue->free_rsps);
432 }
433
434 return 0;
435
436 out_free:
437 while (--i >= 0) {
438 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
439
440 list_del(&rsp->free_list);
441 nvmet_rdma_free_rsp(ndev, rsp);
442 }
443 kfree(queue->rsps);
444 out:
445 return ret;
446 }
447
448 static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
449 {
450 struct nvmet_rdma_device *ndev = queue->dev;
451 int i, nr_rsps = queue->recv_queue_size * 2;
452
453 for (i = 0; i < nr_rsps; i++) {
454 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
455
456 list_del(&rsp->free_list);
457 nvmet_rdma_free_rsp(ndev, rsp);
458 }
459 kfree(queue->rsps);
460 }
461
462 static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
463 struct nvmet_rdma_cmd *cmd)
464 {
465 int ret;
466
467 ib_dma_sync_single_for_device(ndev->device,
468 cmd->sge[0].addr, cmd->sge[0].length,
469 DMA_FROM_DEVICE);
470
471 if (ndev->srq)
472 ret = ib_post_srq_recv(ndev->srq, &cmd->wr, NULL);
473 else
474 ret = ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, NULL);
475
476 if (unlikely(ret))
477 pr_err("post_recv cmd failed\n");
478
479 return ret;
480 }
481
482 static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
483 {
484 spin_lock(&queue->rsp_wr_wait_lock);
485 while (!list_empty(&queue->rsp_wr_wait_list)) {
486 struct nvmet_rdma_rsp *rsp;
487 bool ret;
488
489 rsp = list_entry(queue->rsp_wr_wait_list.next,
490 struct nvmet_rdma_rsp, wait_list);
491 list_del(&rsp->wait_list);
492
493 spin_unlock(&queue->rsp_wr_wait_lock);
494 ret = nvmet_rdma_execute_command(rsp);
495 spin_lock(&queue->rsp_wr_wait_lock);
496
497 if (!ret) {
498 list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
499 break;
500 }
501 }
502 spin_unlock(&queue->rsp_wr_wait_lock);
503 }
504
505
506 static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
507 {
508 struct nvmet_rdma_queue *queue = rsp->queue;
509
510 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
511
512 if (rsp->n_rdma) {
513 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
514 queue->cm_id->port_num, rsp->req.sg,
515 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
516 }
517
518 if (rsp->req.sg != rsp->cmd->inline_sg)
519 nvmet_req_free_sgl(&rsp->req);
520
521 if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
522 nvmet_rdma_process_wr_wait_list(queue);
523
524 nvmet_rdma_put_rsp(rsp);
525 }
526
527 static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
528 {
529 if (queue->nvme_sq.ctrl) {
530 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
531 } else {
532 /*
533 * we didn't setup the controller yet in case
534 * of admin connect error, just disconnect and
535 * cleanup the queue
536 */
537 nvmet_rdma_queue_disconnect(queue);
538 }
539 }
540
541 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
542 {
543 struct nvmet_rdma_rsp *rsp =
544 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
545 struct nvmet_rdma_queue *queue = cq->cq_context;
546
547 nvmet_rdma_release_rsp(rsp);
548
549 if (unlikely(wc->status != IB_WC_SUCCESS &&
550 wc->status != IB_WC_WR_FLUSH_ERR)) {
551 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
552 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
553 nvmet_rdma_error_comp(queue);
554 }
555 }
556
557 static void nvmet_rdma_queue_response(struct nvmet_req *req)
558 {
559 struct nvmet_rdma_rsp *rsp =
560 container_of(req, struct nvmet_rdma_rsp, req);
561 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
562 struct ib_send_wr *first_wr;
563
564 if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
565 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
566 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
567 } else {
568 rsp->send_wr.opcode = IB_WR_SEND;
569 }
570
571 if (nvmet_rdma_need_data_out(rsp))
572 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
573 cm_id->port_num, NULL, &rsp->send_wr);
574 else
575 first_wr = &rsp->send_wr;
576
577 nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
578
579 ib_dma_sync_single_for_device(rsp->queue->dev->device,
580 rsp->send_sge.addr, rsp->send_sge.length,
581 DMA_TO_DEVICE);
582
583 if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) {
584 pr_err("sending cmd response failed\n");
585 nvmet_rdma_release_rsp(rsp);
586 }
587 }
588
589 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
590 {
591 struct nvmet_rdma_rsp *rsp =
592 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
593 struct nvmet_rdma_queue *queue = cq->cq_context;
594
595 WARN_ON(rsp->n_rdma <= 0);
596 atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
597 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
598 queue->cm_id->port_num, rsp->req.sg,
599 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
600 rsp->n_rdma = 0;
601
602 if (unlikely(wc->status != IB_WC_SUCCESS)) {
603 nvmet_req_uninit(&rsp->req);
604 nvmet_rdma_release_rsp(rsp);
605 if (wc->status != IB_WC_WR_FLUSH_ERR) {
606 pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
607 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
608 nvmet_rdma_error_comp(queue);
609 }
610 return;
611 }
612
613 nvmet_req_execute(&rsp->req);
614 }
615
616 static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
617 u64 off)
618 {
619 int sg_count = num_pages(len);
620 struct scatterlist *sg;
621 int i;
622
623 sg = rsp->cmd->inline_sg;
624 for (i = 0; i < sg_count; i++, sg++) {
625 if (i < sg_count - 1)
626 sg_unmark_end(sg);
627 else
628 sg_mark_end(sg);
629 sg->offset = off;
630 sg->length = min_t(int, len, PAGE_SIZE - off);
631 len -= sg->length;
632 if (!i)
633 off = 0;
634 }
635
636 rsp->req.sg = rsp->cmd->inline_sg;
637 rsp->req.sg_cnt = sg_count;
638 }
639
640 static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
641 {
642 struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
643 u64 off = le64_to_cpu(sgl->addr);
644 u32 len = le32_to_cpu(sgl->length);
645
646 if (!nvme_is_write(rsp->req.cmd)) {
647 rsp->req.error_loc =
648 offsetof(struct nvme_common_command, opcode);
649 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
650 }
651
652 if (off + len > rsp->queue->dev->inline_data_size) {
653 pr_err("invalid inline data offset!\n");
654 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
655 }
656
657 /* no data command? */
658 if (!len)
659 return 0;
660
661 nvmet_rdma_use_inline_sg(rsp, len, off);
662 rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
663 rsp->req.transfer_len += len;
664 return 0;
665 }
666
667 static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
668 struct nvme_keyed_sgl_desc *sgl, bool invalidate)
669 {
670 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
671 u64 addr = le64_to_cpu(sgl->addr);
672 u32 key = get_unaligned_le32(sgl->key);
673 int ret;
674
675 rsp->req.transfer_len = get_unaligned_le24(sgl->length);
676
677 /* no data command? */
678 if (!rsp->req.transfer_len)
679 return 0;
680
681 ret = nvmet_req_alloc_sgl(&rsp->req);
682 if (ret < 0)
683 goto error_out;
684
685 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
686 rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
687 nvmet_data_dir(&rsp->req));
688 if (ret < 0)
689 goto error_out;
690 rsp->n_rdma += ret;
691
692 if (invalidate) {
693 rsp->invalidate_rkey = key;
694 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
695 }
696
697 return 0;
698
699 error_out:
700 rsp->req.transfer_len = 0;
701 return NVME_SC_INTERNAL;
702 }
703
704 static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
705 {
706 struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
707
708 switch (sgl->type >> 4) {
709 case NVME_SGL_FMT_DATA_DESC:
710 switch (sgl->type & 0xf) {
711 case NVME_SGL_FMT_OFFSET:
712 return nvmet_rdma_map_sgl_inline(rsp);
713 default:
714 pr_err("invalid SGL subtype: %#x\n", sgl->type);
715 rsp->req.error_loc =
716 offsetof(struct nvme_common_command, dptr);
717 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
718 }
719 case NVME_KEY_SGL_FMT_DATA_DESC:
720 switch (sgl->type & 0xf) {
721 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
722 return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
723 case NVME_SGL_FMT_ADDRESS:
724 return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
725 default:
726 pr_err("invalid SGL subtype: %#x\n", sgl->type);
727 rsp->req.error_loc =
728 offsetof(struct nvme_common_command, dptr);
729 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
730 }
731 default:
732 pr_err("invalid SGL type: %#x\n", sgl->type);
733 rsp->req.error_loc = offsetof(struct nvme_common_command, dptr);
734 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
735 }
736 }
737
738 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
739 {
740 struct nvmet_rdma_queue *queue = rsp->queue;
741
742 if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
743 &queue->sq_wr_avail) < 0)) {
744 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
745 1 + rsp->n_rdma, queue->idx,
746 queue->nvme_sq.ctrl->cntlid);
747 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
748 return false;
749 }
750
751 if (nvmet_rdma_need_data_in(rsp)) {
752 if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp,
753 queue->cm_id->port_num, &rsp->read_cqe, NULL))
754 nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
755 } else {
756 nvmet_req_execute(&rsp->req);
757 }
758
759 return true;
760 }
761
762 static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
763 struct nvmet_rdma_rsp *cmd)
764 {
765 u16 status;
766
767 ib_dma_sync_single_for_cpu(queue->dev->device,
768 cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
769 DMA_FROM_DEVICE);
770 ib_dma_sync_single_for_cpu(queue->dev->device,
771 cmd->send_sge.addr, cmd->send_sge.length,
772 DMA_TO_DEVICE);
773
774 cmd->req.p2p_client = &queue->dev->device->dev;
775
776 if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
777 &queue->nvme_sq, &nvmet_rdma_ops))
778 return;
779
780 status = nvmet_rdma_map_sgl(cmd);
781 if (status)
782 goto out_err;
783
784 if (unlikely(!nvmet_rdma_execute_command(cmd))) {
785 spin_lock(&queue->rsp_wr_wait_lock);
786 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
787 spin_unlock(&queue->rsp_wr_wait_lock);
788 }
789
790 return;
791
792 out_err:
793 nvmet_req_complete(&cmd->req, status);
794 }
795
796 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
797 {
798 struct nvmet_rdma_cmd *cmd =
799 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
800 struct nvmet_rdma_queue *queue = cq->cq_context;
801 struct nvmet_rdma_rsp *rsp;
802
803 if (unlikely(wc->status != IB_WC_SUCCESS)) {
804 if (wc->status != IB_WC_WR_FLUSH_ERR) {
805 pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
806 wc->wr_cqe, ib_wc_status_msg(wc->status),
807 wc->status);
808 nvmet_rdma_error_comp(queue);
809 }
810 return;
811 }
812
813 if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
814 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
815 nvmet_rdma_error_comp(queue);
816 return;
817 }
818
819 cmd->queue = queue;
820 rsp = nvmet_rdma_get_rsp(queue);
821 if (unlikely(!rsp)) {
822 /*
823 * we get here only under memory pressure,
824 * silently drop and have the host retry
825 * as we can't even fail it.
826 */
827 nvmet_rdma_post_recv(queue->dev, cmd);
828 return;
829 }
830 rsp->queue = queue;
831 rsp->cmd = cmd;
832 rsp->flags = 0;
833 rsp->req.cmd = cmd->nvme_cmd;
834 rsp->req.port = queue->port;
835 rsp->n_rdma = 0;
836
837 if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
838 unsigned long flags;
839
840 spin_lock_irqsave(&queue->state_lock, flags);
841 if (queue->state == NVMET_RDMA_Q_CONNECTING)
842 list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
843 else
844 nvmet_rdma_put_rsp(rsp);
845 spin_unlock_irqrestore(&queue->state_lock, flags);
846 return;
847 }
848
849 nvmet_rdma_handle_command(queue, rsp);
850 }
851
852 static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev)
853 {
854 if (!ndev->srq)
855 return;
856
857 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
858 ib_destroy_srq(ndev->srq);
859 }
860
861 static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
862 {
863 struct ib_srq_init_attr srq_attr = { NULL, };
864 struct ib_srq *srq;
865 size_t srq_size;
866 int ret, i;
867
868 srq_size = 4095; /* XXX: tune */
869
870 srq_attr.attr.max_wr = srq_size;
871 srq_attr.attr.max_sge = 1 + ndev->inline_page_count;
872 srq_attr.attr.srq_limit = 0;
873 srq_attr.srq_type = IB_SRQT_BASIC;
874 srq = ib_create_srq(ndev->pd, &srq_attr);
875 if (IS_ERR(srq)) {
876 /*
877 * If SRQs aren't supported we just go ahead and use normal
878 * non-shared receive queues.
879 */
880 pr_info("SRQ requested but not supported.\n");
881 return 0;
882 }
883
884 ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
885 if (IS_ERR(ndev->srq_cmds)) {
886 ret = PTR_ERR(ndev->srq_cmds);
887 goto out_destroy_srq;
888 }
889
890 ndev->srq = srq;
891 ndev->srq_size = srq_size;
892
893 for (i = 0; i < srq_size; i++) {
894 ret = nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]);
895 if (ret)
896 goto out_free_cmds;
897 }
898
899 return 0;
900
901 out_free_cmds:
902 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
903 out_destroy_srq:
904 ib_destroy_srq(srq);
905 return ret;
906 }
907
908 static void nvmet_rdma_free_dev(struct kref *ref)
909 {
910 struct nvmet_rdma_device *ndev =
911 container_of(ref, struct nvmet_rdma_device, ref);
912
913 mutex_lock(&device_list_mutex);
914 list_del(&ndev->entry);
915 mutex_unlock(&device_list_mutex);
916
917 nvmet_rdma_destroy_srq(ndev);
918 ib_dealloc_pd(ndev->pd);
919
920 kfree(ndev);
921 }
922
923 static struct nvmet_rdma_device *
924 nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
925 {
926 struct nvmet_port *port = cm_id->context;
927 struct nvmet_rdma_device *ndev;
928 int inline_page_count;
929 int inline_sge_count;
930 int ret;
931
932 mutex_lock(&device_list_mutex);
933 list_for_each_entry(ndev, &device_list, entry) {
934 if (ndev->device->node_guid == cm_id->device->node_guid &&
935 kref_get_unless_zero(&ndev->ref))
936 goto out_unlock;
937 }
938
939 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
940 if (!ndev)
941 goto out_err;
942
943 inline_page_count = num_pages(port->inline_data_size);
944 inline_sge_count = max(cm_id->device->attrs.max_sge_rd,
945 cm_id->device->attrs.max_recv_sge) - 1;
946 if (inline_page_count > inline_sge_count) {
947 pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n",
948 port->inline_data_size, cm_id->device->name,
949 inline_sge_count * PAGE_SIZE);
950 port->inline_data_size = inline_sge_count * PAGE_SIZE;
951 inline_page_count = inline_sge_count;
952 }
953 ndev->inline_data_size = port->inline_data_size;
954 ndev->inline_page_count = inline_page_count;
955 ndev->device = cm_id->device;
956 kref_init(&ndev->ref);
957
958 ndev->pd = ib_alloc_pd(ndev->device, 0);
959 if (IS_ERR(ndev->pd))
960 goto out_free_dev;
961
962 if (nvmet_rdma_use_srq) {
963 ret = nvmet_rdma_init_srq(ndev);
964 if (ret)
965 goto out_free_pd;
966 }
967
968 list_add(&ndev->entry, &device_list);
969 out_unlock:
970 mutex_unlock(&device_list_mutex);
971 pr_debug("added %s.\n", ndev->device->name);
972 return ndev;
973
974 out_free_pd:
975 ib_dealloc_pd(ndev->pd);
976 out_free_dev:
977 kfree(ndev);
978 out_err:
979 mutex_unlock(&device_list_mutex);
980 return NULL;
981 }
982
983 static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
984 {
985 struct ib_qp_init_attr qp_attr;
986 struct nvmet_rdma_device *ndev = queue->dev;
987 int comp_vector, nr_cqe, ret, i;
988
989 /*
990 * Spread the io queues across completion vectors,
991 * but still keep all admin queues on vector 0.
992 */
993 comp_vector = !queue->host_qid ? 0 :
994 queue->idx % ndev->device->num_comp_vectors;
995
996 /*
997 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
998 */
999 nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
1000
1001 queue->cq = ib_alloc_cq(ndev->device, queue,
1002 nr_cqe + 1, comp_vector,
1003 IB_POLL_WORKQUEUE);
1004 if (IS_ERR(queue->cq)) {
1005 ret = PTR_ERR(queue->cq);
1006 pr_err("failed to create CQ cqe= %d ret= %d\n",
1007 nr_cqe + 1, ret);
1008 goto out;
1009 }
1010
1011 memset(&qp_attr, 0, sizeof(qp_attr));
1012 qp_attr.qp_context = queue;
1013 qp_attr.event_handler = nvmet_rdma_qp_event;
1014 qp_attr.send_cq = queue->cq;
1015 qp_attr.recv_cq = queue->cq;
1016 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
1017 qp_attr.qp_type = IB_QPT_RC;
1018 /* +1 for drain */
1019 qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
1020 qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
1021 qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
1022 ndev->device->attrs.max_send_sge);
1023
1024 if (ndev->srq) {
1025 qp_attr.srq = ndev->srq;
1026 } else {
1027 /* +1 for drain */
1028 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
1029 qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count;
1030 }
1031
1032 ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
1033 if (ret) {
1034 pr_err("failed to create_qp ret= %d\n", ret);
1035 goto err_destroy_cq;
1036 }
1037
1038 atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
1039
1040 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1041 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
1042 qp_attr.cap.max_send_wr, queue->cm_id);
1043
1044 if (!ndev->srq) {
1045 for (i = 0; i < queue->recv_queue_size; i++) {
1046 queue->cmds[i].queue = queue;
1047 ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
1048 if (ret)
1049 goto err_destroy_qp;
1050 }
1051 }
1052
1053 out:
1054 return ret;
1055
1056 err_destroy_qp:
1057 rdma_destroy_qp(queue->cm_id);
1058 err_destroy_cq:
1059 ib_free_cq(queue->cq);
1060 goto out;
1061 }
1062
1063 static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
1064 {
1065 struct ib_qp *qp = queue->cm_id->qp;
1066
1067 ib_drain_qp(qp);
1068 rdma_destroy_id(queue->cm_id);
1069 ib_destroy_qp(qp);
1070 ib_free_cq(queue->cq);
1071 }
1072
1073 static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
1074 {
1075 pr_debug("freeing queue %d\n", queue->idx);
1076
1077 nvmet_sq_destroy(&queue->nvme_sq);
1078
1079 nvmet_rdma_destroy_queue_ib(queue);
1080 if (!queue->dev->srq) {
1081 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1082 queue->recv_queue_size,
1083 !queue->host_qid);
1084 }
1085 nvmet_rdma_free_rsps(queue);
1086 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1087 kfree(queue);
1088 }
1089
1090 static void nvmet_rdma_release_queue_work(struct work_struct *w)
1091 {
1092 struct nvmet_rdma_queue *queue =
1093 container_of(w, struct nvmet_rdma_queue, release_work);
1094 struct nvmet_rdma_device *dev = queue->dev;
1095
1096 nvmet_rdma_free_queue(queue);
1097
1098 kref_put(&dev->ref, nvmet_rdma_free_dev);
1099 }
1100
1101 static int
1102 nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
1103 struct nvmet_rdma_queue *queue)
1104 {
1105 struct nvme_rdma_cm_req *req;
1106
1107 req = (struct nvme_rdma_cm_req *)conn->private_data;
1108 if (!req || conn->private_data_len == 0)
1109 return NVME_RDMA_CM_INVALID_LEN;
1110
1111 if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1112 return NVME_RDMA_CM_INVALID_RECFMT;
1113
1114 queue->host_qid = le16_to_cpu(req->qid);
1115
1116 /*
1117 * req->hsqsize corresponds to our recv queue size plus 1
1118 * req->hrqsize corresponds to our send queue size
1119 */
1120 queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
1121 queue->send_queue_size = le16_to_cpu(req->hrqsize);
1122
1123 if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH)
1124 return NVME_RDMA_CM_INVALID_HSQSIZE;
1125
1126 /* XXX: Should we enforce some kind of max for IO queues? */
1127
1128 return 0;
1129 }
1130
1131 static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1132 enum nvme_rdma_cm_status status)
1133 {
1134 struct nvme_rdma_cm_rej rej;
1135
1136 pr_debug("rejecting connect request: status %d (%s)\n",
1137 status, nvme_rdma_cm_msg(status));
1138
1139 rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1140 rej.sts = cpu_to_le16(status);
1141
1142 return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
1143 }
1144
1145 static struct nvmet_rdma_queue *
1146 nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1147 struct rdma_cm_id *cm_id,
1148 struct rdma_cm_event *event)
1149 {
1150 struct nvmet_rdma_queue *queue;
1151 int ret;
1152
1153 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1154 if (!queue) {
1155 ret = NVME_RDMA_CM_NO_RSC;
1156 goto out_reject;
1157 }
1158
1159 ret = nvmet_sq_init(&queue->nvme_sq);
1160 if (ret) {
1161 ret = NVME_RDMA_CM_NO_RSC;
1162 goto out_free_queue;
1163 }
1164
1165 ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1166 if (ret)
1167 goto out_destroy_sq;
1168
1169 /*
1170 * Schedules the actual release because calling rdma_destroy_id from
1171 * inside a CM callback would trigger a deadlock. (great API design..)
1172 */
1173 INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1174 queue->dev = ndev;
1175 queue->cm_id = cm_id;
1176
1177 spin_lock_init(&queue->state_lock);
1178 queue->state = NVMET_RDMA_Q_CONNECTING;
1179 INIT_LIST_HEAD(&queue->rsp_wait_list);
1180 INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1181 spin_lock_init(&queue->rsp_wr_wait_lock);
1182 INIT_LIST_HEAD(&queue->free_rsps);
1183 spin_lock_init(&queue->rsps_lock);
1184 INIT_LIST_HEAD(&queue->queue_list);
1185
1186 queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
1187 if (queue->idx < 0) {
1188 ret = NVME_RDMA_CM_NO_RSC;
1189 goto out_destroy_sq;
1190 }
1191
1192 ret = nvmet_rdma_alloc_rsps(queue);
1193 if (ret) {
1194 ret = NVME_RDMA_CM_NO_RSC;
1195 goto out_ida_remove;
1196 }
1197
1198 if (!ndev->srq) {
1199 queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1200 queue->recv_queue_size,
1201 !queue->host_qid);
1202 if (IS_ERR(queue->cmds)) {
1203 ret = NVME_RDMA_CM_NO_RSC;
1204 goto out_free_responses;
1205 }
1206 }
1207
1208 ret = nvmet_rdma_create_queue_ib(queue);
1209 if (ret) {
1210 pr_err("%s: creating RDMA queue failed (%d).\n",
1211 __func__, ret);
1212 ret = NVME_RDMA_CM_NO_RSC;
1213 goto out_free_cmds;
1214 }
1215
1216 return queue;
1217
1218 out_free_cmds:
1219 if (!ndev->srq) {
1220 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1221 queue->recv_queue_size,
1222 !queue->host_qid);
1223 }
1224 out_free_responses:
1225 nvmet_rdma_free_rsps(queue);
1226 out_ida_remove:
1227 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1228 out_destroy_sq:
1229 nvmet_sq_destroy(&queue->nvme_sq);
1230 out_free_queue:
1231 kfree(queue);
1232 out_reject:
1233 nvmet_rdma_cm_reject(cm_id, ret);
1234 return NULL;
1235 }
1236
1237 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1238 {
1239 struct nvmet_rdma_queue *queue = priv;
1240
1241 switch (event->event) {
1242 case IB_EVENT_COMM_EST:
1243 rdma_notify(queue->cm_id, event->event);
1244 break;
1245 default:
1246 pr_err("received IB QP event: %s (%d)\n",
1247 ib_event_msg(event->event), event->event);
1248 break;
1249 }
1250 }
1251
1252 static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1253 struct nvmet_rdma_queue *queue,
1254 struct rdma_conn_param *p)
1255 {
1256 struct rdma_conn_param param = { };
1257 struct nvme_rdma_cm_rep priv = { };
1258 int ret = -ENOMEM;
1259
1260 param.rnr_retry_count = 7;
1261 param.flow_control = 1;
1262 param.initiator_depth = min_t(u8, p->initiator_depth,
1263 queue->dev->device->attrs.max_qp_init_rd_atom);
1264 param.private_data = &priv;
1265 param.private_data_len = sizeof(priv);
1266 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1267 priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1268
1269 ret = rdma_accept(cm_id, &param);
1270 if (ret)
1271 pr_err("rdma_accept failed (error code = %d)\n", ret);
1272
1273 return ret;
1274 }
1275
1276 static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1277 struct rdma_cm_event *event)
1278 {
1279 struct nvmet_rdma_device *ndev;
1280 struct nvmet_rdma_queue *queue;
1281 int ret = -EINVAL;
1282
1283 ndev = nvmet_rdma_find_get_device(cm_id);
1284 if (!ndev) {
1285 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1286 return -ECONNREFUSED;
1287 }
1288
1289 queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1290 if (!queue) {
1291 ret = -ENOMEM;
1292 goto put_device;
1293 }
1294 queue->port = cm_id->context;
1295
1296 if (queue->host_qid == 0) {
1297 /* Let inflight controller teardown complete */
1298 flush_scheduled_work();
1299 }
1300
1301 ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1302 if (ret) {
1303 schedule_work(&queue->release_work);
1304 /* Destroying rdma_cm id is not needed here */
1305 return 0;
1306 }
1307
1308 mutex_lock(&nvmet_rdma_queue_mutex);
1309 list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1310 mutex_unlock(&nvmet_rdma_queue_mutex);
1311
1312 return 0;
1313
1314 put_device:
1315 kref_put(&ndev->ref, nvmet_rdma_free_dev);
1316
1317 return ret;
1318 }
1319
1320 static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1321 {
1322 unsigned long flags;
1323
1324 spin_lock_irqsave(&queue->state_lock, flags);
1325 if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1326 pr_warn("trying to establish a connected queue\n");
1327 goto out_unlock;
1328 }
1329 queue->state = NVMET_RDMA_Q_LIVE;
1330
1331 while (!list_empty(&queue->rsp_wait_list)) {
1332 struct nvmet_rdma_rsp *cmd;
1333
1334 cmd = list_first_entry(&queue->rsp_wait_list,
1335 struct nvmet_rdma_rsp, wait_list);
1336 list_del(&cmd->wait_list);
1337
1338 spin_unlock_irqrestore(&queue->state_lock, flags);
1339 nvmet_rdma_handle_command(queue, cmd);
1340 spin_lock_irqsave(&queue->state_lock, flags);
1341 }
1342
1343 out_unlock:
1344 spin_unlock_irqrestore(&queue->state_lock, flags);
1345 }
1346
1347 static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1348 {
1349 bool disconnect = false;
1350 unsigned long flags;
1351
1352 pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1353
1354 spin_lock_irqsave(&queue->state_lock, flags);
1355 switch (queue->state) {
1356 case NVMET_RDMA_Q_CONNECTING:
1357 case NVMET_RDMA_Q_LIVE:
1358 queue->state = NVMET_RDMA_Q_DISCONNECTING;
1359 disconnect = true;
1360 break;
1361 case NVMET_RDMA_Q_DISCONNECTING:
1362 break;
1363 }
1364 spin_unlock_irqrestore(&queue->state_lock, flags);
1365
1366 if (disconnect) {
1367 rdma_disconnect(queue->cm_id);
1368 schedule_work(&queue->release_work);
1369 }
1370 }
1371
1372 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1373 {
1374 bool disconnect = false;
1375
1376 mutex_lock(&nvmet_rdma_queue_mutex);
1377 if (!list_empty(&queue->queue_list)) {
1378 list_del_init(&queue->queue_list);
1379 disconnect = true;
1380 }
1381 mutex_unlock(&nvmet_rdma_queue_mutex);
1382
1383 if (disconnect)
1384 __nvmet_rdma_queue_disconnect(queue);
1385 }
1386
1387 static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1388 struct nvmet_rdma_queue *queue)
1389 {
1390 WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1391
1392 mutex_lock(&nvmet_rdma_queue_mutex);
1393 if (!list_empty(&queue->queue_list))
1394 list_del_init(&queue->queue_list);
1395 mutex_unlock(&nvmet_rdma_queue_mutex);
1396
1397 pr_err("failed to connect queue %d\n", queue->idx);
1398 schedule_work(&queue->release_work);
1399 }
1400
1401 /**
1402 * nvme_rdma_device_removal() - Handle RDMA device removal
1403 * @cm_id: rdma_cm id, used for nvmet port
1404 * @queue: nvmet rdma queue (cm id qp_context)
1405 *
1406 * DEVICE_REMOVAL event notifies us that the RDMA device is about
1407 * to unplug. Note that this event can be generated on a normal
1408 * queue cm_id and/or a device bound listener cm_id (where in this
1409 * case queue will be null).
1410 *
1411 * We registered an ib_client to handle device removal for queues,
1412 * so we only need to handle the listening port cm_ids. In this case
1413 * we nullify the priv to prevent double cm_id destruction and destroying
1414 * the cm_id implicitely by returning a non-zero rc to the callout.
1415 */
1416 static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1417 struct nvmet_rdma_queue *queue)
1418 {
1419 struct nvmet_port *port;
1420
1421 if (queue) {
1422 /*
1423 * This is a queue cm_id. we have registered
1424 * an ib_client to handle queues removal
1425 * so don't interfear and just return.
1426 */
1427 return 0;
1428 }
1429
1430 port = cm_id->context;
1431
1432 /*
1433 * This is a listener cm_id. Make sure that
1434 * future remove_port won't invoke a double
1435 * cm_id destroy. use atomic xchg to make sure
1436 * we don't compete with remove_port.
1437 */
1438 if (xchg(&port->priv, NULL) != cm_id)
1439 return 0;
1440
1441 /*
1442 * We need to return 1 so that the core will destroy
1443 * it's own ID. What a great API design..
1444 */
1445 return 1;
1446 }
1447
1448 static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1449 struct rdma_cm_event *event)
1450 {
1451 struct nvmet_rdma_queue *queue = NULL;
1452 int ret = 0;
1453
1454 if (cm_id->qp)
1455 queue = cm_id->qp->qp_context;
1456
1457 pr_debug("%s (%d): status %d id %p\n",
1458 rdma_event_msg(event->event), event->event,
1459 event->status, cm_id);
1460
1461 switch (event->event) {
1462 case RDMA_CM_EVENT_CONNECT_REQUEST:
1463 ret = nvmet_rdma_queue_connect(cm_id, event);
1464 break;
1465 case RDMA_CM_EVENT_ESTABLISHED:
1466 nvmet_rdma_queue_established(queue);
1467 break;
1468 case RDMA_CM_EVENT_ADDR_CHANGE:
1469 case RDMA_CM_EVENT_DISCONNECTED:
1470 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1471 nvmet_rdma_queue_disconnect(queue);
1472 break;
1473 case RDMA_CM_EVENT_DEVICE_REMOVAL:
1474 ret = nvmet_rdma_device_removal(cm_id, queue);
1475 break;
1476 case RDMA_CM_EVENT_REJECTED:
1477 pr_debug("Connection rejected: %s\n",
1478 rdma_reject_msg(cm_id, event->status));
1479 /* FALLTHROUGH */
1480 case RDMA_CM_EVENT_UNREACHABLE:
1481 case RDMA_CM_EVENT_CONNECT_ERROR:
1482 nvmet_rdma_queue_connect_fail(cm_id, queue);
1483 break;
1484 default:
1485 pr_err("received unrecognized RDMA CM event %d\n",
1486 event->event);
1487 break;
1488 }
1489
1490 return ret;
1491 }
1492
1493 static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1494 {
1495 struct nvmet_rdma_queue *queue;
1496
1497 restart:
1498 mutex_lock(&nvmet_rdma_queue_mutex);
1499 list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
1500 if (queue->nvme_sq.ctrl == ctrl) {
1501 list_del_init(&queue->queue_list);
1502 mutex_unlock(&nvmet_rdma_queue_mutex);
1503
1504 __nvmet_rdma_queue_disconnect(queue);
1505 goto restart;
1506 }
1507 }
1508 mutex_unlock(&nvmet_rdma_queue_mutex);
1509 }
1510
1511 static int nvmet_rdma_add_port(struct nvmet_port *port)
1512 {
1513 struct rdma_cm_id *cm_id;
1514 struct sockaddr_storage addr = { };
1515 __kernel_sa_family_t af;
1516 int ret;
1517
1518 switch (port->disc_addr.adrfam) {
1519 case NVMF_ADDR_FAMILY_IP4:
1520 af = AF_INET;
1521 break;
1522 case NVMF_ADDR_FAMILY_IP6:
1523 af = AF_INET6;
1524 break;
1525 default:
1526 pr_err("address family %d not supported\n",
1527 port->disc_addr.adrfam);
1528 return -EINVAL;
1529 }
1530
1531 if (port->inline_data_size < 0) {
1532 port->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE;
1533 } else if (port->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) {
1534 pr_warn("inline_data_size %u is too large, reducing to %u\n",
1535 port->inline_data_size,
1536 NVMET_RDMA_MAX_INLINE_DATA_SIZE);
1537 port->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE;
1538 }
1539
1540 ret = inet_pton_with_scope(&init_net, af, port->disc_addr.traddr,
1541 port->disc_addr.trsvcid, &addr);
1542 if (ret) {
1543 pr_err("malformed ip/port passed: %s:%s\n",
1544 port->disc_addr.traddr, port->disc_addr.trsvcid);
1545 return ret;
1546 }
1547
1548 cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1549 RDMA_PS_TCP, IB_QPT_RC);
1550 if (IS_ERR(cm_id)) {
1551 pr_err("CM ID creation failed\n");
1552 return PTR_ERR(cm_id);
1553 }
1554
1555 /*
1556 * Allow both IPv4 and IPv6 sockets to bind a single port
1557 * at the same time.
1558 */
1559 ret = rdma_set_afonly(cm_id, 1);
1560 if (ret) {
1561 pr_err("rdma_set_afonly failed (%d)\n", ret);
1562 goto out_destroy_id;
1563 }
1564
1565 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr);
1566 if (ret) {
1567 pr_err("binding CM ID to %pISpcs failed (%d)\n",
1568 (struct sockaddr *)&addr, ret);
1569 goto out_destroy_id;
1570 }
1571
1572 ret = rdma_listen(cm_id, 128);
1573 if (ret) {
1574 pr_err("listening to %pISpcs failed (%d)\n",
1575 (struct sockaddr *)&addr, ret);
1576 goto out_destroy_id;
1577 }
1578
1579 pr_info("enabling port %d (%pISpcs)\n",
1580 le16_to_cpu(port->disc_addr.portid), (struct sockaddr *)&addr);
1581 port->priv = cm_id;
1582 return 0;
1583
1584 out_destroy_id:
1585 rdma_destroy_id(cm_id);
1586 return ret;
1587 }
1588
1589 static void nvmet_rdma_remove_port(struct nvmet_port *port)
1590 {
1591 struct rdma_cm_id *cm_id = xchg(&port->priv, NULL);
1592
1593 if (cm_id)
1594 rdma_destroy_id(cm_id);
1595 }
1596
1597 static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
1598 struct nvmet_port *port, char *traddr)
1599 {
1600 struct rdma_cm_id *cm_id = port->priv;
1601
1602 if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) {
1603 struct nvmet_rdma_rsp *rsp =
1604 container_of(req, struct nvmet_rdma_rsp, req);
1605 struct rdma_cm_id *req_cm_id = rsp->queue->cm_id;
1606 struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr;
1607
1608 sprintf(traddr, "%pISc", addr);
1609 } else {
1610 memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
1611 }
1612 }
1613
1614 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
1615 .owner = THIS_MODULE,
1616 .type = NVMF_TRTYPE_RDMA,
1617 .msdbd = 1,
1618 .has_keyed_sgls = 1,
1619 .add_port = nvmet_rdma_add_port,
1620 .remove_port = nvmet_rdma_remove_port,
1621 .queue_response = nvmet_rdma_queue_response,
1622 .delete_ctrl = nvmet_rdma_delete_ctrl,
1623 .disc_traddr = nvmet_rdma_disc_port_addr,
1624 };
1625
1626 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
1627 {
1628 struct nvmet_rdma_queue *queue, *tmp;
1629 struct nvmet_rdma_device *ndev;
1630 bool found = false;
1631
1632 mutex_lock(&device_list_mutex);
1633 list_for_each_entry(ndev, &device_list, entry) {
1634 if (ndev->device == ib_device) {
1635 found = true;
1636 break;
1637 }
1638 }
1639 mutex_unlock(&device_list_mutex);
1640
1641 if (!found)
1642 return;
1643
1644 /*
1645 * IB Device that is used by nvmet controllers is being removed,
1646 * delete all queues using this device.
1647 */
1648 mutex_lock(&nvmet_rdma_queue_mutex);
1649 list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
1650 queue_list) {
1651 if (queue->dev->device != ib_device)
1652 continue;
1653
1654 pr_info("Removing queue %d\n", queue->idx);
1655 list_del_init(&queue->queue_list);
1656 __nvmet_rdma_queue_disconnect(queue);
1657 }
1658 mutex_unlock(&nvmet_rdma_queue_mutex);
1659
1660 flush_scheduled_work();
1661 }
1662
1663 static struct ib_client nvmet_rdma_ib_client = {
1664 .name = "nvmet_rdma",
1665 .remove = nvmet_rdma_remove_one
1666 };
1667
1668 static int __init nvmet_rdma_init(void)
1669 {
1670 int ret;
1671
1672 ret = ib_register_client(&nvmet_rdma_ib_client);
1673 if (ret)
1674 return ret;
1675
1676 ret = nvmet_register_transport(&nvmet_rdma_ops);
1677 if (ret)
1678 goto err_ib_client;
1679
1680 return 0;
1681
1682 err_ib_client:
1683 ib_unregister_client(&nvmet_rdma_ib_client);
1684 return ret;
1685 }
1686
1687 static void __exit nvmet_rdma_exit(void)
1688 {
1689 nvmet_unregister_transport(&nvmet_rdma_ops);
1690 ib_unregister_client(&nvmet_rdma_ib_client);
1691 WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list));
1692 ida_destroy(&nvmet_rdma_queue_ida);
1693 }
1694
1695 module_init(nvmet_rdma_init);
1696 module_exit(nvmet_rdma_exit);
1697
1698 MODULE_LICENSE("GPL v2");
1699 MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */
Linux with added FPC-III support