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f81232: switch to ->get_serial()
[linux/fpc-iii.git] / drivers / nvme / target / rdma.c
blob3533e918ea376bbb221489f086047521443c17e8
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 u8 n_rdma;
70 u32 flags;
71 u32 invalidate_rkey;
72
73 struct list_head wait_list;
74 struct list_head free_list;
75 };
76
77 enum nvmet_rdma_queue_state {
78 NVMET_RDMA_Q_CONNECTING,
79 NVMET_RDMA_Q_LIVE,
80 NVMET_RDMA_Q_DISCONNECTING,
81 };
82
83 struct nvmet_rdma_queue {
84 struct rdma_cm_id *cm_id;
85 struct nvmet_port *port;
86 struct ib_cq *cq;
87 atomic_t sq_wr_avail;
88 struct nvmet_rdma_device *dev;
89 spinlock_t state_lock;
90 enum nvmet_rdma_queue_state state;
91 struct nvmet_cq nvme_cq;
92 struct nvmet_sq nvme_sq;
93
94 struct nvmet_rdma_rsp *rsps;
95 struct list_head free_rsps;
96 spinlock_t rsps_lock;
97 struct nvmet_rdma_cmd *cmds;
98
99 struct work_struct release_work;
100 struct list_head rsp_wait_list;
101 struct list_head rsp_wr_wait_list;
102 spinlock_t rsp_wr_wait_lock;
103
104 int idx;
105 int host_qid;
106 int recv_queue_size;
107 int send_queue_size;
108
109 struct list_head queue_list;
110 };
111
112 struct nvmet_rdma_device {
113 struct ib_device *device;
114 struct ib_pd *pd;
115 struct ib_srq *srq;
116 struct nvmet_rdma_cmd *srq_cmds;
117 size_t srq_size;
118 struct kref ref;
119 struct list_head entry;
120 int inline_data_size;
121 int inline_page_count;
122 };
123
124 static bool nvmet_rdma_use_srq;
125 module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
126 MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
127
128 static DEFINE_IDA(nvmet_rdma_queue_ida);
129 static LIST_HEAD(nvmet_rdma_queue_list);
130 static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
131
132 static LIST_HEAD(device_list);
133 static DEFINE_MUTEX(device_list_mutex);
134
135 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
136 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
137 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
138 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
139 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
140 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
141
142 static const struct nvmet_fabrics_ops nvmet_rdma_ops;
143
144 static int num_pages(int len)
145 {
146 return 1 + (((len - 1) & PAGE_MASK) >> PAGE_SHIFT);
147 }
148
149 /* XXX: really should move to a generic header sooner or later.. */
150 static inline u32 get_unaligned_le24(const u8 *p)
151 {
152 return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16;
153 }
154
155 static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
156 {
157 return nvme_is_write(rsp->req.cmd) &&
158 rsp->req.transfer_len &&
159 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
160 }
161
162 static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
163 {
164 return !nvme_is_write(rsp->req.cmd) &&
165 rsp->req.transfer_len &&
166 !rsp->req.rsp->status &&
167 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
168 }
169
170 static inline struct nvmet_rdma_rsp *
171 nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
172 {
173 struct nvmet_rdma_rsp *rsp;
174 unsigned long flags;
175
176 spin_lock_irqsave(&queue->rsps_lock, flags);
177 rsp = list_first_entry(&queue->free_rsps,
178 struct nvmet_rdma_rsp, free_list);
179 list_del(&rsp->free_list);
180 spin_unlock_irqrestore(&queue->rsps_lock, flags);
181
182 return rsp;
183 }
184
185 static inline void
186 nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
187 {
188 unsigned long flags;
189
190 spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
191 list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
192 spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
193 }
194
195 static void nvmet_rdma_free_inline_pages(struct nvmet_rdma_device *ndev,
196 struct nvmet_rdma_cmd *c)
197 {
198 struct scatterlist *sg;
199 struct ib_sge *sge;
200 int i;
201
202 if (!ndev->inline_data_size)
203 return;
204
205 sg = c->inline_sg;
206 sge = &c->sge[1];
207
208 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
209 if (sge->length)
210 ib_dma_unmap_page(ndev->device, sge->addr,
211 sge->length, DMA_FROM_DEVICE);
212 if (sg_page(sg))
213 __free_page(sg_page(sg));
214 }
215 }
216
217 static int nvmet_rdma_alloc_inline_pages(struct nvmet_rdma_device *ndev,
218 struct nvmet_rdma_cmd *c)
219 {
220 struct scatterlist *sg;
221 struct ib_sge *sge;
222 struct page *pg;
223 int len;
224 int i;
225
226 if (!ndev->inline_data_size)
227 return 0;
228
229 sg = c->inline_sg;
230 sg_init_table(sg, ndev->inline_page_count);
231 sge = &c->sge[1];
232 len = ndev->inline_data_size;
233
234 for (i = 0; i < ndev->inline_page_count; i++, sg++, sge++) {
235 pg = alloc_page(GFP_KERNEL);
236 if (!pg)
237 goto out_err;
238 sg_assign_page(sg, pg);
239 sge->addr = ib_dma_map_page(ndev->device,
240 pg, 0, PAGE_SIZE, DMA_FROM_DEVICE);
241 if (ib_dma_mapping_error(ndev->device, sge->addr))
242 goto out_err;
243 sge->length = min_t(int, len, PAGE_SIZE);
244 sge->lkey = ndev->pd->local_dma_lkey;
245 len -= sge->length;
246 }
247
248 return 0;
249 out_err:
250 for (; i >= 0; i--, sg--, sge--) {
251 if (sge->length)
252 ib_dma_unmap_page(ndev->device, sge->addr,
253 sge->length, DMA_FROM_DEVICE);
254 if (sg_page(sg))
255 __free_page(sg_page(sg));
256 }
257 return -ENOMEM;
258 }
259
260 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
261 struct nvmet_rdma_cmd *c, bool admin)
262 {
263 /* NVMe command / RDMA RECV */
264 c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
265 if (!c->nvme_cmd)
266 goto out;
267
268 c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
269 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
270 if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
271 goto out_free_cmd;
272
273 c->sge[0].length = sizeof(*c->nvme_cmd);
274 c->sge[0].lkey = ndev->pd->local_dma_lkey;
275
276 if (!admin && nvmet_rdma_alloc_inline_pages(ndev, c))
277 goto out_unmap_cmd;
278
279 c->cqe.done = nvmet_rdma_recv_done;
280
281 c->wr.wr_cqe = &c->cqe;
282 c->wr.sg_list = c->sge;
283 c->wr.num_sge = admin ? 1 : ndev->inline_page_count + 1;
284
285 return 0;
286
287 out_unmap_cmd:
288 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
289 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
290 out_free_cmd:
291 kfree(c->nvme_cmd);
292
293 out:
294 return -ENOMEM;
295 }
296
297 static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
298 struct nvmet_rdma_cmd *c, bool admin)
299 {
300 if (!admin)
301 nvmet_rdma_free_inline_pages(ndev, c);
302 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
303 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
304 kfree(c->nvme_cmd);
305 }
306
307 static struct nvmet_rdma_cmd *
308 nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
309 int nr_cmds, bool admin)
310 {
311 struct nvmet_rdma_cmd *cmds;
312 int ret = -EINVAL, i;
313
314 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
315 if (!cmds)
316 goto out;
317
318 for (i = 0; i < nr_cmds; i++) {
319 ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
320 if (ret)
321 goto out_free;
322 }
323
324 return cmds;
325
326 out_free:
327 while (--i >= 0)
328 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
329 kfree(cmds);
330 out:
331 return ERR_PTR(ret);
332 }
333
334 static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
335 struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
336 {
337 int i;
338
339 for (i = 0; i < nr_cmds; i++)
340 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
341 kfree(cmds);
342 }
343
344 static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
345 struct nvmet_rdma_rsp *r)
346 {
347 /* NVMe CQE / RDMA SEND */
348 r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL);
349 if (!r->req.rsp)
350 goto out;
351
352 r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp,
353 sizeof(*r->req.rsp), DMA_TO_DEVICE);
354 if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
355 goto out_free_rsp;
356
357 r->send_sge.length = sizeof(*r->req.rsp);
358 r->send_sge.lkey = ndev->pd->local_dma_lkey;
359
360 r->send_cqe.done = nvmet_rdma_send_done;
361
362 r->send_wr.wr_cqe = &r->send_cqe;
363 r->send_wr.sg_list = &r->send_sge;
364 r->send_wr.num_sge = 1;
365 r->send_wr.send_flags = IB_SEND_SIGNALED;
366
367 /* Data In / RDMA READ */
368 r->read_cqe.done = nvmet_rdma_read_data_done;
369 return 0;
370
371 out_free_rsp:
372 kfree(r->req.rsp);
373 out:
374 return -ENOMEM;
375 }
376
377 static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
378 struct nvmet_rdma_rsp *r)
379 {
380 ib_dma_unmap_single(ndev->device, r->send_sge.addr,
381 sizeof(*r->req.rsp), DMA_TO_DEVICE);
382 kfree(r->req.rsp);
383 }
384
385 static int
386 nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
387 {
388 struct nvmet_rdma_device *ndev = queue->dev;
389 int nr_rsps = queue->recv_queue_size * 2;
390 int ret = -EINVAL, i;
391
392 queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
393 GFP_KERNEL);
394 if (!queue->rsps)
395 goto out;
396
397 for (i = 0; i < nr_rsps; i++) {
398 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
399
400 ret = nvmet_rdma_alloc_rsp(ndev, rsp);
401 if (ret)
402 goto out_free;
403
404 list_add_tail(&rsp->free_list, &queue->free_rsps);
405 }
406
407 return 0;
408
409 out_free:
410 while (--i >= 0) {
411 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
412
413 list_del(&rsp->free_list);
414 nvmet_rdma_free_rsp(ndev, rsp);
415 }
416 kfree(queue->rsps);
417 out:
418 return ret;
419 }
420
421 static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
422 {
423 struct nvmet_rdma_device *ndev = queue->dev;
424 int i, nr_rsps = queue->recv_queue_size * 2;
425
426 for (i = 0; i < nr_rsps; i++) {
427 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
428
429 list_del(&rsp->free_list);
430 nvmet_rdma_free_rsp(ndev, rsp);
431 }
432 kfree(queue->rsps);
433 }
434
435 static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
436 struct nvmet_rdma_cmd *cmd)
437 {
438 int ret;
439
440 ib_dma_sync_single_for_device(ndev->device,
441 cmd->sge[0].addr, cmd->sge[0].length,
442 DMA_FROM_DEVICE);
443
444 if (ndev->srq)
445 ret = ib_post_srq_recv(ndev->srq, &cmd->wr, NULL);
446 else
447 ret = ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, NULL);
448
449 if (unlikely(ret))
450 pr_err("post_recv cmd failed\n");
451
452 return ret;
453 }
454
455 static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
456 {
457 spin_lock(&queue->rsp_wr_wait_lock);
458 while (!list_empty(&queue->rsp_wr_wait_list)) {
459 struct nvmet_rdma_rsp *rsp;
460 bool ret;
461
462 rsp = list_entry(queue->rsp_wr_wait_list.next,
463 struct nvmet_rdma_rsp, wait_list);
464 list_del(&rsp->wait_list);
465
466 spin_unlock(&queue->rsp_wr_wait_lock);
467 ret = nvmet_rdma_execute_command(rsp);
468 spin_lock(&queue->rsp_wr_wait_lock);
469
470 if (!ret) {
471 list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
472 break;
473 }
474 }
475 spin_unlock(&queue->rsp_wr_wait_lock);
476 }
477
478
479 static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
480 {
481 struct nvmet_rdma_queue *queue = rsp->queue;
482
483 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
484
485 if (rsp->n_rdma) {
486 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
487 queue->cm_id->port_num, rsp->req.sg,
488 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
489 }
490
491 if (rsp->req.sg != rsp->cmd->inline_sg)
492 sgl_free(rsp->req.sg);
493
494 if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
495 nvmet_rdma_process_wr_wait_list(queue);
496
497 nvmet_rdma_put_rsp(rsp);
498 }
499
500 static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
501 {
502 if (queue->nvme_sq.ctrl) {
503 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
504 } else {
505 /*
506 * we didn't setup the controller yet in case
507 * of admin connect error, just disconnect and
508 * cleanup the queue
509 */
510 nvmet_rdma_queue_disconnect(queue);
511 }
512 }
513
514 static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
515 {
516 struct nvmet_rdma_rsp *rsp =
517 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
518
519 nvmet_rdma_release_rsp(rsp);
520
521 if (unlikely(wc->status != IB_WC_SUCCESS &&
522 wc->status != IB_WC_WR_FLUSH_ERR)) {
523 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
524 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
525 nvmet_rdma_error_comp(rsp->queue);
526 }
527 }
528
529 static void nvmet_rdma_queue_response(struct nvmet_req *req)
530 {
531 struct nvmet_rdma_rsp *rsp =
532 container_of(req, struct nvmet_rdma_rsp, req);
533 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
534 struct ib_send_wr *first_wr;
535
536 if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
537 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
538 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
539 } else {
540 rsp->send_wr.opcode = IB_WR_SEND;
541 }
542
543 if (nvmet_rdma_need_data_out(rsp))
544 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
545 cm_id->port_num, NULL, &rsp->send_wr);
546 else
547 first_wr = &rsp->send_wr;
548
549 nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
550
551 ib_dma_sync_single_for_device(rsp->queue->dev->device,
552 rsp->send_sge.addr, rsp->send_sge.length,
553 DMA_TO_DEVICE);
554
555 if (unlikely(ib_post_send(cm_id->qp, first_wr, NULL))) {
556 pr_err("sending cmd response failed\n");
557 nvmet_rdma_release_rsp(rsp);
558 }
559 }
560
561 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
562 {
563 struct nvmet_rdma_rsp *rsp =
564 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
565 struct nvmet_rdma_queue *queue = cq->cq_context;
566
567 WARN_ON(rsp->n_rdma <= 0);
568 atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
569 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
570 queue->cm_id->port_num, rsp->req.sg,
571 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
572 rsp->n_rdma = 0;
573
574 if (unlikely(wc->status != IB_WC_SUCCESS)) {
575 nvmet_req_uninit(&rsp->req);
576 nvmet_rdma_release_rsp(rsp);
577 if (wc->status != IB_WC_WR_FLUSH_ERR) {
578 pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
579 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
580 nvmet_rdma_error_comp(queue);
581 }
582 return;
583 }
584
585 nvmet_req_execute(&rsp->req);
586 }
587
588 static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
589 u64 off)
590 {
591 int sg_count = num_pages(len);
592 struct scatterlist *sg;
593 int i;
594
595 sg = rsp->cmd->inline_sg;
596 for (i = 0; i < sg_count; i++, sg++) {
597 if (i < sg_count - 1)
598 sg_unmark_end(sg);
599 else
600 sg_mark_end(sg);
601 sg->offset = off;
602 sg->length = min_t(int, len, PAGE_SIZE - off);
603 len -= sg->length;
604 if (!i)
605 off = 0;
606 }
607
608 rsp->req.sg = rsp->cmd->inline_sg;
609 rsp->req.sg_cnt = sg_count;
610 }
611
612 static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
613 {
614 struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
615 u64 off = le64_to_cpu(sgl->addr);
616 u32 len = le32_to_cpu(sgl->length);
617
618 if (!nvme_is_write(rsp->req.cmd))
619 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
620
621 if (off + len > rsp->queue->dev->inline_data_size) {
622 pr_err("invalid inline data offset!\n");
623 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
624 }
625
626 /* no data command? */
627 if (!len)
628 return 0;
629
630 nvmet_rdma_use_inline_sg(rsp, len, off);
631 rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
632 rsp->req.transfer_len += len;
633 return 0;
634 }
635
636 static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
637 struct nvme_keyed_sgl_desc *sgl, bool invalidate)
638 {
639 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
640 u64 addr = le64_to_cpu(sgl->addr);
641 u32 len = get_unaligned_le24(sgl->length);
642 u32 key = get_unaligned_le32(sgl->key);
643 int ret;
644
645 /* no data command? */
646 if (!len)
647 return 0;
648
649 rsp->req.sg = sgl_alloc(len, GFP_KERNEL, &rsp->req.sg_cnt);
650 if (!rsp->req.sg)
651 return NVME_SC_INTERNAL;
652
653 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
654 rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
655 nvmet_data_dir(&rsp->req));
656 if (ret < 0)
657 return NVME_SC_INTERNAL;
658 rsp->req.transfer_len += len;
659 rsp->n_rdma += ret;
660
661 if (invalidate) {
662 rsp->invalidate_rkey = key;
663 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
664 }
665
666 return 0;
667 }
668
669 static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
670 {
671 struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
672
673 switch (sgl->type >> 4) {
674 case NVME_SGL_FMT_DATA_DESC:
675 switch (sgl->type & 0xf) {
676 case NVME_SGL_FMT_OFFSET:
677 return nvmet_rdma_map_sgl_inline(rsp);
678 default:
679 pr_err("invalid SGL subtype: %#x\n", sgl->type);
680 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
681 }
682 case NVME_KEY_SGL_FMT_DATA_DESC:
683 switch (sgl->type & 0xf) {
684 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
685 return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
686 case NVME_SGL_FMT_ADDRESS:
687 return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
688 default:
689 pr_err("invalid SGL subtype: %#x\n", sgl->type);
690 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
691 }
692 default:
693 pr_err("invalid SGL type: %#x\n", sgl->type);
694 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
695 }
696 }
697
698 static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
699 {
700 struct nvmet_rdma_queue *queue = rsp->queue;
701
702 if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
703 &queue->sq_wr_avail) < 0)) {
704 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
705 1 + rsp->n_rdma, queue->idx,
706 queue->nvme_sq.ctrl->cntlid);
707 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
708 return false;
709 }
710
711 if (nvmet_rdma_need_data_in(rsp)) {
712 if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp,
713 queue->cm_id->port_num, &rsp->read_cqe, NULL))
714 nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
715 } else {
716 nvmet_req_execute(&rsp->req);
717 }
718
719 return true;
720 }
721
722 static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
723 struct nvmet_rdma_rsp *cmd)
724 {
725 u16 status;
726
727 ib_dma_sync_single_for_cpu(queue->dev->device,
728 cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
729 DMA_FROM_DEVICE);
730 ib_dma_sync_single_for_cpu(queue->dev->device,
731 cmd->send_sge.addr, cmd->send_sge.length,
732 DMA_TO_DEVICE);
733
734 if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
735 &queue->nvme_sq, &nvmet_rdma_ops))
736 return;
737
738 status = nvmet_rdma_map_sgl(cmd);
739 if (status)
740 goto out_err;
741
742 if (unlikely(!nvmet_rdma_execute_command(cmd))) {
743 spin_lock(&queue->rsp_wr_wait_lock);
744 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
745 spin_unlock(&queue->rsp_wr_wait_lock);
746 }
747
748 return;
749
750 out_err:
751 nvmet_req_complete(&cmd->req, status);
752 }
753
754 static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
755 {
756 struct nvmet_rdma_cmd *cmd =
757 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
758 struct nvmet_rdma_queue *queue = cq->cq_context;
759 struct nvmet_rdma_rsp *rsp;
760
761 if (unlikely(wc->status != IB_WC_SUCCESS)) {
762 if (wc->status != IB_WC_WR_FLUSH_ERR) {
763 pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
764 wc->wr_cqe, ib_wc_status_msg(wc->status),
765 wc->status);
766 nvmet_rdma_error_comp(queue);
767 }
768 return;
769 }
770
771 if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
772 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
773 nvmet_rdma_error_comp(queue);
774 return;
775 }
776
777 cmd->queue = queue;
778 rsp = nvmet_rdma_get_rsp(queue);
779 rsp->queue = queue;
780 rsp->cmd = cmd;
781 rsp->flags = 0;
782 rsp->req.cmd = cmd->nvme_cmd;
783 rsp->req.port = queue->port;
784 rsp->n_rdma = 0;
785
786 if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
787 unsigned long flags;
788
789 spin_lock_irqsave(&queue->state_lock, flags);
790 if (queue->state == NVMET_RDMA_Q_CONNECTING)
791 list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
792 else
793 nvmet_rdma_put_rsp(rsp);
794 spin_unlock_irqrestore(&queue->state_lock, flags);
795 return;
796 }
797
798 nvmet_rdma_handle_command(queue, rsp);
799 }
800
801 static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev)
802 {
803 if (!ndev->srq)
804 return;
805
806 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
807 ib_destroy_srq(ndev->srq);
808 }
809
810 static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
811 {
812 struct ib_srq_init_attr srq_attr = { NULL, };
813 struct ib_srq *srq;
814 size_t srq_size;
815 int ret, i;
816
817 srq_size = 4095; /* XXX: tune */
818
819 srq_attr.attr.max_wr = srq_size;
820 srq_attr.attr.max_sge = 1 + ndev->inline_page_count;
821 srq_attr.attr.srq_limit = 0;
822 srq_attr.srq_type = IB_SRQT_BASIC;
823 srq = ib_create_srq(ndev->pd, &srq_attr);
824 if (IS_ERR(srq)) {
825 /*
826 * If SRQs aren't supported we just go ahead and use normal
827 * non-shared receive queues.
828 */
829 pr_info("SRQ requested but not supported.\n");
830 return 0;
831 }
832
833 ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
834 if (IS_ERR(ndev->srq_cmds)) {
835 ret = PTR_ERR(ndev->srq_cmds);
836 goto out_destroy_srq;
837 }
838
839 ndev->srq = srq;
840 ndev->srq_size = srq_size;
841
842 for (i = 0; i < srq_size; i++) {
843 ret = nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]);
844 if (ret)
845 goto out_free_cmds;
846 }
847
848 return 0;
849
850 out_free_cmds:
851 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
852 out_destroy_srq:
853 ib_destroy_srq(srq);
854 return ret;
855 }
856
857 static void nvmet_rdma_free_dev(struct kref *ref)
858 {
859 struct nvmet_rdma_device *ndev =
860 container_of(ref, struct nvmet_rdma_device, ref);
861
862 mutex_lock(&device_list_mutex);
863 list_del(&ndev->entry);
864 mutex_unlock(&device_list_mutex);
865
866 nvmet_rdma_destroy_srq(ndev);
867 ib_dealloc_pd(ndev->pd);
868
869 kfree(ndev);
870 }
871
872 static struct nvmet_rdma_device *
873 nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
874 {
875 struct nvmet_port *port = cm_id->context;
876 struct nvmet_rdma_device *ndev;
877 int inline_page_count;
878 int inline_sge_count;
879 int ret;
880
881 mutex_lock(&device_list_mutex);
882 list_for_each_entry(ndev, &device_list, entry) {
883 if (ndev->device->node_guid == cm_id->device->node_guid &&
884 kref_get_unless_zero(&ndev->ref))
885 goto out_unlock;
886 }
887
888 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
889 if (!ndev)
890 goto out_err;
891
892 inline_page_count = num_pages(port->inline_data_size);
893 inline_sge_count = max(cm_id->device->attrs.max_sge_rd,
894 cm_id->device->attrs.max_recv_sge) - 1;
895 if (inline_page_count > inline_sge_count) {
896 pr_warn("inline_data_size %d cannot be supported by device %s. Reducing to %lu.\n",
897 port->inline_data_size, cm_id->device->name,
898 inline_sge_count * PAGE_SIZE);
899 port->inline_data_size = inline_sge_count * PAGE_SIZE;
900 inline_page_count = inline_sge_count;
901 }
902 ndev->inline_data_size = port->inline_data_size;
903 ndev->inline_page_count = inline_page_count;
904 ndev->device = cm_id->device;
905 kref_init(&ndev->ref);
906
907 ndev->pd = ib_alloc_pd(ndev->device, 0);
908 if (IS_ERR(ndev->pd))
909 goto out_free_dev;
910
911 if (nvmet_rdma_use_srq) {
912 ret = nvmet_rdma_init_srq(ndev);
913 if (ret)
914 goto out_free_pd;
915 }
916
917 list_add(&ndev->entry, &device_list);
918 out_unlock:
919 mutex_unlock(&device_list_mutex);
920 pr_debug("added %s.\n", ndev->device->name);
921 return ndev;
922
923 out_free_pd:
924 ib_dealloc_pd(ndev->pd);
925 out_free_dev:
926 kfree(ndev);
927 out_err:
928 mutex_unlock(&device_list_mutex);
929 return NULL;
930 }
931
932 static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
933 {
934 struct ib_qp_init_attr qp_attr;
935 struct nvmet_rdma_device *ndev = queue->dev;
936 int comp_vector, nr_cqe, ret, i;
937
938 /*
939 * Spread the io queues across completion vectors,
940 * but still keep all admin queues on vector 0.
941 */
942 comp_vector = !queue->host_qid ? 0 :
943 queue->idx % ndev->device->num_comp_vectors;
944
945 /*
946 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
947 */
948 nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
949
950 queue->cq = ib_alloc_cq(ndev->device, queue,
951 nr_cqe + 1, comp_vector,
952 IB_POLL_WORKQUEUE);
953 if (IS_ERR(queue->cq)) {
954 ret = PTR_ERR(queue->cq);
955 pr_err("failed to create CQ cqe= %d ret= %d\n",
956 nr_cqe + 1, ret);
957 goto out;
958 }
959
960 memset(&qp_attr, 0, sizeof(qp_attr));
961 qp_attr.qp_context = queue;
962 qp_attr.event_handler = nvmet_rdma_qp_event;
963 qp_attr.send_cq = queue->cq;
964 qp_attr.recv_cq = queue->cq;
965 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
966 qp_attr.qp_type = IB_QPT_RC;
967 /* +1 for drain */
968 qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
969 qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
970 qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
971 ndev->device->attrs.max_send_sge);
972
973 if (ndev->srq) {
974 qp_attr.srq = ndev->srq;
975 } else {
976 /* +1 for drain */
977 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
978 qp_attr.cap.max_recv_sge = 1 + ndev->inline_page_count;
979 }
980
981 ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
982 if (ret) {
983 pr_err("failed to create_qp ret= %d\n", ret);
984 goto err_destroy_cq;
985 }
986
987 atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
988
989 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
990 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
991 qp_attr.cap.max_send_wr, queue->cm_id);
992
993 if (!ndev->srq) {
994 for (i = 0; i < queue->recv_queue_size; i++) {
995 queue->cmds[i].queue = queue;
996 ret = nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
997 if (ret)
998 goto err_destroy_qp;
999 }
1000 }
1001
1002 out:
1003 return ret;
1004
1005 err_destroy_qp:
1006 rdma_destroy_qp(queue->cm_id);
1007 err_destroy_cq:
1008 ib_free_cq(queue->cq);
1009 goto out;
1010 }
1011
1012 static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
1013 {
1014 struct ib_qp *qp = queue->cm_id->qp;
1015
1016 ib_drain_qp(qp);
1017 rdma_destroy_id(queue->cm_id);
1018 ib_destroy_qp(qp);
1019 ib_free_cq(queue->cq);
1020 }
1021
1022 static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
1023 {
1024 pr_debug("freeing queue %d\n", queue->idx);
1025
1026 nvmet_sq_destroy(&queue->nvme_sq);
1027
1028 nvmet_rdma_destroy_queue_ib(queue);
1029 if (!queue->dev->srq) {
1030 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1031 queue->recv_queue_size,
1032 !queue->host_qid);
1033 }
1034 nvmet_rdma_free_rsps(queue);
1035 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1036 kfree(queue);
1037 }
1038
1039 static void nvmet_rdma_release_queue_work(struct work_struct *w)
1040 {
1041 struct nvmet_rdma_queue *queue =
1042 container_of(w, struct nvmet_rdma_queue, release_work);
1043 struct nvmet_rdma_device *dev = queue->dev;
1044
1045 nvmet_rdma_free_queue(queue);
1046
1047 kref_put(&dev->ref, nvmet_rdma_free_dev);
1048 }
1049
1050 static int
1051 nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
1052 struct nvmet_rdma_queue *queue)
1053 {
1054 struct nvme_rdma_cm_req *req;
1055
1056 req = (struct nvme_rdma_cm_req *)conn->private_data;
1057 if (!req || conn->private_data_len == 0)
1058 return NVME_RDMA_CM_INVALID_LEN;
1059
1060 if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1061 return NVME_RDMA_CM_INVALID_RECFMT;
1062
1063 queue->host_qid = le16_to_cpu(req->qid);
1064
1065 /*
1066 * req->hsqsize corresponds to our recv queue size plus 1
1067 * req->hrqsize corresponds to our send queue size
1068 */
1069 queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
1070 queue->send_queue_size = le16_to_cpu(req->hrqsize);
1071
1072 if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH)
1073 return NVME_RDMA_CM_INVALID_HSQSIZE;
1074
1075 /* XXX: Should we enforce some kind of max for IO queues? */
1076
1077 return 0;
1078 }
1079
1080 static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1081 enum nvme_rdma_cm_status status)
1082 {
1083 struct nvme_rdma_cm_rej rej;
1084
1085 pr_debug("rejecting connect request: status %d (%s)\n",
1086 status, nvme_rdma_cm_msg(status));
1087
1088 rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1089 rej.sts = cpu_to_le16(status);
1090
1091 return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
1092 }
1093
1094 static struct nvmet_rdma_queue *
1095 nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1096 struct rdma_cm_id *cm_id,
1097 struct rdma_cm_event *event)
1098 {
1099 struct nvmet_rdma_queue *queue;
1100 int ret;
1101
1102 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1103 if (!queue) {
1104 ret = NVME_RDMA_CM_NO_RSC;
1105 goto out_reject;
1106 }
1107
1108 ret = nvmet_sq_init(&queue->nvme_sq);
1109 if (ret) {
1110 ret = NVME_RDMA_CM_NO_RSC;
1111 goto out_free_queue;
1112 }
1113
1114 ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1115 if (ret)
1116 goto out_destroy_sq;
1117
1118 /*
1119 * Schedules the actual release because calling rdma_destroy_id from
1120 * inside a CM callback would trigger a deadlock. (great API design..)
1121 */
1122 INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1123 queue->dev = ndev;
1124 queue->cm_id = cm_id;
1125
1126 spin_lock_init(&queue->state_lock);
1127 queue->state = NVMET_RDMA_Q_CONNECTING;
1128 INIT_LIST_HEAD(&queue->rsp_wait_list);
1129 INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1130 spin_lock_init(&queue->rsp_wr_wait_lock);
1131 INIT_LIST_HEAD(&queue->free_rsps);
1132 spin_lock_init(&queue->rsps_lock);
1133 INIT_LIST_HEAD(&queue->queue_list);
1134
1135 queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
1136 if (queue->idx < 0) {
1137 ret = NVME_RDMA_CM_NO_RSC;
1138 goto out_destroy_sq;
1139 }
1140
1141 ret = nvmet_rdma_alloc_rsps(queue);
1142 if (ret) {
1143 ret = NVME_RDMA_CM_NO_RSC;
1144 goto out_ida_remove;
1145 }
1146
1147 if (!ndev->srq) {
1148 queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1149 queue->recv_queue_size,
1150 !queue->host_qid);
1151 if (IS_ERR(queue->cmds)) {
1152 ret = NVME_RDMA_CM_NO_RSC;
1153 goto out_free_responses;
1154 }
1155 }
1156
1157 ret = nvmet_rdma_create_queue_ib(queue);
1158 if (ret) {
1159 pr_err("%s: creating RDMA queue failed (%d).\n",
1160 __func__, ret);
1161 ret = NVME_RDMA_CM_NO_RSC;
1162 goto out_free_cmds;
1163 }
1164
1165 return queue;
1166
1167 out_free_cmds:
1168 if (!ndev->srq) {
1169 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1170 queue->recv_queue_size,
1171 !queue->host_qid);
1172 }
1173 out_free_responses:
1174 nvmet_rdma_free_rsps(queue);
1175 out_ida_remove:
1176 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1177 out_destroy_sq:
1178 nvmet_sq_destroy(&queue->nvme_sq);
1179 out_free_queue:
1180 kfree(queue);
1181 out_reject:
1182 nvmet_rdma_cm_reject(cm_id, ret);
1183 return NULL;
1184 }
1185
1186 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1187 {
1188 struct nvmet_rdma_queue *queue = priv;
1189
1190 switch (event->event) {
1191 case IB_EVENT_COMM_EST:
1192 rdma_notify(queue->cm_id, event->event);
1193 break;
1194 default:
1195 pr_err("received IB QP event: %s (%d)\n",
1196 ib_event_msg(event->event), event->event);
1197 break;
1198 }
1199 }
1200
1201 static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1202 struct nvmet_rdma_queue *queue,
1203 struct rdma_conn_param *p)
1204 {
1205 struct rdma_conn_param param = { };
1206 struct nvme_rdma_cm_rep priv = { };
1207 int ret = -ENOMEM;
1208
1209 param.rnr_retry_count = 7;
1210 param.flow_control = 1;
1211 param.initiator_depth = min_t(u8, p->initiator_depth,
1212 queue->dev->device->attrs.max_qp_init_rd_atom);
1213 param.private_data = &priv;
1214 param.private_data_len = sizeof(priv);
1215 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1216 priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1217
1218 ret = rdma_accept(cm_id, &param);
1219 if (ret)
1220 pr_err("rdma_accept failed (error code = %d)\n", ret);
1221
1222 return ret;
1223 }
1224
1225 static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1226 struct rdma_cm_event *event)
1227 {
1228 struct nvmet_rdma_device *ndev;
1229 struct nvmet_rdma_queue *queue;
1230 int ret = -EINVAL;
1231
1232 ndev = nvmet_rdma_find_get_device(cm_id);
1233 if (!ndev) {
1234 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1235 return -ECONNREFUSED;
1236 }
1237
1238 queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1239 if (!queue) {
1240 ret = -ENOMEM;
1241 goto put_device;
1242 }
1243 queue->port = cm_id->context;
1244
1245 if (queue->host_qid == 0) {
1246 /* Let inflight controller teardown complete */
1247 flush_scheduled_work();
1248 }
1249
1250 ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1251 if (ret) {
1252 schedule_work(&queue->release_work);
1253 /* Destroying rdma_cm id is not needed here */
1254 return 0;
1255 }
1256
1257 mutex_lock(&nvmet_rdma_queue_mutex);
1258 list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1259 mutex_unlock(&nvmet_rdma_queue_mutex);
1260
1261 return 0;
1262
1263 put_device:
1264 kref_put(&ndev->ref, nvmet_rdma_free_dev);
1265
1266 return ret;
1267 }
1268
1269 static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1270 {
1271 unsigned long flags;
1272
1273 spin_lock_irqsave(&queue->state_lock, flags);
1274 if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1275 pr_warn("trying to establish a connected queue\n");
1276 goto out_unlock;
1277 }
1278 queue->state = NVMET_RDMA_Q_LIVE;
1279
1280 while (!list_empty(&queue->rsp_wait_list)) {
1281 struct nvmet_rdma_rsp *cmd;
1282
1283 cmd = list_first_entry(&queue->rsp_wait_list,
1284 struct nvmet_rdma_rsp, wait_list);
1285 list_del(&cmd->wait_list);
1286
1287 spin_unlock_irqrestore(&queue->state_lock, flags);
1288 nvmet_rdma_handle_command(queue, cmd);
1289 spin_lock_irqsave(&queue->state_lock, flags);
1290 }
1291
1292 out_unlock:
1293 spin_unlock_irqrestore(&queue->state_lock, flags);
1294 }
1295
1296 static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1297 {
1298 bool disconnect = false;
1299 unsigned long flags;
1300
1301 pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1302
1303 spin_lock_irqsave(&queue->state_lock, flags);
1304 switch (queue->state) {
1305 case NVMET_RDMA_Q_CONNECTING:
1306 case NVMET_RDMA_Q_LIVE:
1307 queue->state = NVMET_RDMA_Q_DISCONNECTING;
1308 disconnect = true;
1309 break;
1310 case NVMET_RDMA_Q_DISCONNECTING:
1311 break;
1312 }
1313 spin_unlock_irqrestore(&queue->state_lock, flags);
1314
1315 if (disconnect) {
1316 rdma_disconnect(queue->cm_id);
1317 schedule_work(&queue->release_work);
1318 }
1319 }
1320
1321 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1322 {
1323 bool disconnect = false;
1324
1325 mutex_lock(&nvmet_rdma_queue_mutex);
1326 if (!list_empty(&queue->queue_list)) {
1327 list_del_init(&queue->queue_list);
1328 disconnect = true;
1329 }
1330 mutex_unlock(&nvmet_rdma_queue_mutex);
1331
1332 if (disconnect)
1333 __nvmet_rdma_queue_disconnect(queue);
1334 }
1335
1336 static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1337 struct nvmet_rdma_queue *queue)
1338 {
1339 WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1340
1341 mutex_lock(&nvmet_rdma_queue_mutex);
1342 if (!list_empty(&queue->queue_list))
1343 list_del_init(&queue->queue_list);
1344 mutex_unlock(&nvmet_rdma_queue_mutex);
1345
1346 pr_err("failed to connect queue %d\n", queue->idx);
1347 schedule_work(&queue->release_work);
1348 }
1349
1350 /**
1351 * nvme_rdma_device_removal() - Handle RDMA device removal
1352 * @cm_id: rdma_cm id, used for nvmet port
1353 * @queue: nvmet rdma queue (cm id qp_context)
1354 *
1355 * DEVICE_REMOVAL event notifies us that the RDMA device is about
1356 * to unplug. Note that this event can be generated on a normal
1357 * queue cm_id and/or a device bound listener cm_id (where in this
1358 * case queue will be null).
1359 *
1360 * We registered an ib_client to handle device removal for queues,
1361 * so we only need to handle the listening port cm_ids. In this case
1362 * we nullify the priv to prevent double cm_id destruction and destroying
1363 * the cm_id implicitely by returning a non-zero rc to the callout.
1364 */
1365 static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1366 struct nvmet_rdma_queue *queue)
1367 {
1368 struct nvmet_port *port;
1369
1370 if (queue) {
1371 /*
1372 * This is a queue cm_id. we have registered
1373 * an ib_client to handle queues removal
1374 * so don't interfear and just return.
1375 */
1376 return 0;
1377 }
1378
1379 port = cm_id->context;
1380
1381 /*
1382 * This is a listener cm_id. Make sure that
1383 * future remove_port won't invoke a double
1384 * cm_id destroy. use atomic xchg to make sure
1385 * we don't compete with remove_port.
1386 */
1387 if (xchg(&port->priv, NULL) != cm_id)
1388 return 0;
1389
1390 /*
1391 * We need to return 1 so that the core will destroy
1392 * it's own ID. What a great API design..
1393 */
1394 return 1;
1395 }
1396
1397 static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1398 struct rdma_cm_event *event)
1399 {
1400 struct nvmet_rdma_queue *queue = NULL;
1401 int ret = 0;
1402
1403 if (cm_id->qp)
1404 queue = cm_id->qp->qp_context;
1405
1406 pr_debug("%s (%d): status %d id %p\n",
1407 rdma_event_msg(event->event), event->event,
1408 event->status, cm_id);
1409
1410 switch (event->event) {
1411 case RDMA_CM_EVENT_CONNECT_REQUEST:
1412 ret = nvmet_rdma_queue_connect(cm_id, event);
1413 break;
1414 case RDMA_CM_EVENT_ESTABLISHED:
1415 nvmet_rdma_queue_established(queue);
1416 break;
1417 case RDMA_CM_EVENT_ADDR_CHANGE:
1418 case RDMA_CM_EVENT_DISCONNECTED:
1419 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1420 nvmet_rdma_queue_disconnect(queue);
1421 break;
1422 case RDMA_CM_EVENT_DEVICE_REMOVAL:
1423 ret = nvmet_rdma_device_removal(cm_id, queue);
1424 break;
1425 case RDMA_CM_EVENT_REJECTED:
1426 pr_debug("Connection rejected: %s\n",
1427 rdma_reject_msg(cm_id, event->status));
1428 /* FALLTHROUGH */
1429 case RDMA_CM_EVENT_UNREACHABLE:
1430 case RDMA_CM_EVENT_CONNECT_ERROR:
1431 nvmet_rdma_queue_connect_fail(cm_id, queue);
1432 break;
1433 default:
1434 pr_err("received unrecognized RDMA CM event %d\n",
1435 event->event);
1436 break;
1437 }
1438
1439 return ret;
1440 }
1441
1442 static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1443 {
1444 struct nvmet_rdma_queue *queue;
1445
1446 restart:
1447 mutex_lock(&nvmet_rdma_queue_mutex);
1448 list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
1449 if (queue->nvme_sq.ctrl == ctrl) {
1450 list_del_init(&queue->queue_list);
1451 mutex_unlock(&nvmet_rdma_queue_mutex);
1452
1453 __nvmet_rdma_queue_disconnect(queue);
1454 goto restart;
1455 }
1456 }
1457 mutex_unlock(&nvmet_rdma_queue_mutex);
1458 }
1459
1460 static int nvmet_rdma_add_port(struct nvmet_port *port)
1461 {
1462 struct rdma_cm_id *cm_id;
1463 struct sockaddr_storage addr = { };
1464 __kernel_sa_family_t af;
1465 int ret;
1466
1467 switch (port->disc_addr.adrfam) {
1468 case NVMF_ADDR_FAMILY_IP4:
1469 af = AF_INET;
1470 break;
1471 case NVMF_ADDR_FAMILY_IP6:
1472 af = AF_INET6;
1473 break;
1474 default:
1475 pr_err("address family %d not supported\n",
1476 port->disc_addr.adrfam);
1477 return -EINVAL;
1478 }
1479
1480 if (port->inline_data_size < 0) {
1481 port->inline_data_size = NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE;
1482 } else if (port->inline_data_size > NVMET_RDMA_MAX_INLINE_DATA_SIZE) {
1483 pr_warn("inline_data_size %u is too large, reducing to %u\n",
1484 port->inline_data_size,
1485 NVMET_RDMA_MAX_INLINE_DATA_SIZE);
1486 port->inline_data_size = NVMET_RDMA_MAX_INLINE_DATA_SIZE;
1487 }
1488
1489 ret = inet_pton_with_scope(&init_net, af, port->disc_addr.traddr,
1490 port->disc_addr.trsvcid, &addr);
1491 if (ret) {
1492 pr_err("malformed ip/port passed: %s:%s\n",
1493 port->disc_addr.traddr, port->disc_addr.trsvcid);
1494 return ret;
1495 }
1496
1497 cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1498 RDMA_PS_TCP, IB_QPT_RC);
1499 if (IS_ERR(cm_id)) {
1500 pr_err("CM ID creation failed\n");
1501 return PTR_ERR(cm_id);
1502 }
1503
1504 /*
1505 * Allow both IPv4 and IPv6 sockets to bind a single port
1506 * at the same time.
1507 */
1508 ret = rdma_set_afonly(cm_id, 1);
1509 if (ret) {
1510 pr_err("rdma_set_afonly failed (%d)\n", ret);
1511 goto out_destroy_id;
1512 }
1513
1514 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr);
1515 if (ret) {
1516 pr_err("binding CM ID to %pISpcs failed (%d)\n",
1517 (struct sockaddr *)&addr, ret);
1518 goto out_destroy_id;
1519 }
1520
1521 ret = rdma_listen(cm_id, 128);
1522 if (ret) {
1523 pr_err("listening to %pISpcs failed (%d)\n",
1524 (struct sockaddr *)&addr, ret);
1525 goto out_destroy_id;
1526 }
1527
1528 pr_info("enabling port %d (%pISpcs)\n",
1529 le16_to_cpu(port->disc_addr.portid), (struct sockaddr *)&addr);
1530 port->priv = cm_id;
1531 return 0;
1532
1533 out_destroy_id:
1534 rdma_destroy_id(cm_id);
1535 return ret;
1536 }
1537
1538 static void nvmet_rdma_remove_port(struct nvmet_port *port)
1539 {
1540 struct rdma_cm_id *cm_id = xchg(&port->priv, NULL);
1541
1542 if (cm_id)
1543 rdma_destroy_id(cm_id);
1544 }
1545
1546 static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
1547 struct nvmet_port *port, char *traddr)
1548 {
1549 struct rdma_cm_id *cm_id = port->priv;
1550
1551 if (inet_addr_is_any((struct sockaddr *)&cm_id->route.addr.src_addr)) {
1552 struct nvmet_rdma_rsp *rsp =
1553 container_of(req, struct nvmet_rdma_rsp, req);
1554 struct rdma_cm_id *req_cm_id = rsp->queue->cm_id;
1555 struct sockaddr *addr = (void *)&req_cm_id->route.addr.src_addr;
1556
1557 sprintf(traddr, "%pISc", addr);
1558 } else {
1559 memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
1560 }
1561 }
1562
1563 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
1564 .owner = THIS_MODULE,
1565 .type = NVMF_TRTYPE_RDMA,
1566 .msdbd = 1,
1567 .has_keyed_sgls = 1,
1568 .add_port = nvmet_rdma_add_port,
1569 .remove_port = nvmet_rdma_remove_port,
1570 .queue_response = nvmet_rdma_queue_response,
1571 .delete_ctrl = nvmet_rdma_delete_ctrl,
1572 .disc_traddr = nvmet_rdma_disc_port_addr,
1573 };
1574
1575 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
1576 {
1577 struct nvmet_rdma_queue *queue, *tmp;
1578 struct nvmet_rdma_device *ndev;
1579 bool found = false;
1580
1581 mutex_lock(&device_list_mutex);
1582 list_for_each_entry(ndev, &device_list, entry) {
1583 if (ndev->device == ib_device) {
1584 found = true;
1585 break;
1586 }
1587 }
1588 mutex_unlock(&device_list_mutex);
1589
1590 if (!found)
1591 return;
1592
1593 /*
1594 * IB Device that is used by nvmet controllers is being removed,
1595 * delete all queues using this device.
1596 */
1597 mutex_lock(&nvmet_rdma_queue_mutex);
1598 list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
1599 queue_list) {
1600 if (queue->dev->device != ib_device)
1601 continue;
1602
1603 pr_info("Removing queue %d\n", queue->idx);
1604 list_del_init(&queue->queue_list);
1605 __nvmet_rdma_queue_disconnect(queue);
1606 }
1607 mutex_unlock(&nvmet_rdma_queue_mutex);
1608
1609 flush_scheduled_work();
1610 }
1611
1612 static struct ib_client nvmet_rdma_ib_client = {
1613 .name = "nvmet_rdma",
1614 .remove = nvmet_rdma_remove_one
1615 };
1616
1617 static int __init nvmet_rdma_init(void)
1618 {
1619 int ret;
1620
1621 ret = ib_register_client(&nvmet_rdma_ib_client);
1622 if (ret)
1623 return ret;
1624
1625 ret = nvmet_register_transport(&nvmet_rdma_ops);
1626 if (ret)
1627 goto err_ib_client;
1628
1629 return 0;
1630
1631 err_ib_client:
1632 ib_unregister_client(&nvmet_rdma_ib_client);
1633 return ret;
1634 }
1635
1636 static void __exit nvmet_rdma_exit(void)
1637 {
1638 nvmet_unregister_transport(&nvmet_rdma_ops);
1639 ib_unregister_client(&nvmet_rdma_ib_client);
1640 WARN_ON_ONCE(!list_empty(&nvmet_rdma_queue_list));
1641 ida_destroy(&nvmet_rdma_queue_ida);
1642 }
1643
1644 module_init(nvmet_rdma_init);
1645 module_exit(nvmet_rdma_exit);
1646
1647 MODULE_LICENSE("GPL v2");
1648 MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */
Linux with added FPC-III support