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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / drivers / nvme / target / rdma.c
CommitLineData
8f000cac
CH		 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 up to a page of inline data to go with the SQE
37 */
38#define NVMET_RDMA_INLINE_DATA_SIZE PAGE_SIZE
39
40struct nvmet_rdma_cmd {
41 struct ib_sge sge[2];
42 struct ib_cqe cqe;
43 struct ib_recv_wr wr;
44 struct scatterlist inline_sg;
45 struct page *inline_page;
46 struct nvme_command *nvme_cmd;
47 struct nvmet_rdma_queue *queue;
48};
49
50enum {
51 NVMET_RDMA_REQ_INLINE_DATA = (1 << 0),
52 NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1),
53};
54
55struct nvmet_rdma_rsp {
56 struct ib_sge send_sge;
57 struct ib_cqe send_cqe;
58 struct ib_send_wr send_wr;
59
60 struct nvmet_rdma_cmd *cmd;
61 struct nvmet_rdma_queue *queue;
62
63 struct ib_cqe read_cqe;
64 struct rdma_rw_ctx rw;
65
66 struct nvmet_req req;
67
68 u8 n_rdma;
69 u32 flags;
70 u32 invalidate_rkey;
71
72 struct list_head wait_list;
73 struct list_head free_list;
74};
75
76enum nvmet_rdma_queue_state {
77 NVMET_RDMA_Q_CONNECTING,
78 NVMET_RDMA_Q_LIVE,
79 NVMET_RDMA_Q_DISCONNECTING,
d8f7750a 80 NVMET_RDMA_IN_DEVICE_REMOVAL,
8f000cac
CH		 81};
82
83struct 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
112struct 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};
121
122static bool nvmet_rdma_use_srq;
123module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
124MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
125
126static DEFINE_IDA(nvmet_rdma_queue_ida);
127static LIST_HEAD(nvmet_rdma_queue_list);
128static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
129
130static LIST_HEAD(device_list);
131static DEFINE_MUTEX(device_list_mutex);
132
133static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
134static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
135static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
136static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
137static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
138static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
139
140static struct nvmet_fabrics_ops nvmet_rdma_ops;
141
142/* XXX: really should move to a generic header sooner or later.. */
143static inline u32 get_unaligned_le24(const u8 *p)
144{
145 return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16;
146}
147
148static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
149{
150 return nvme_is_write(rsp->req.cmd) &&
151 rsp->req.data_len &&
152 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
153}
154
155static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
156{
157 return !nvme_is_write(rsp->req.cmd) &&
158 rsp->req.data_len &&
159 !rsp->req.rsp->status &&
160 !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
161}
162
163static inline struct nvmet_rdma_rsp *
164nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
165{
166 struct nvmet_rdma_rsp *rsp;
167 unsigned long flags;
168
169 spin_lock_irqsave(&queue->rsps_lock, flags);
170 rsp = list_first_entry(&queue->free_rsps,
171 struct nvmet_rdma_rsp, free_list);
172 list_del(&rsp->free_list);
173 spin_unlock_irqrestore(&queue->rsps_lock, flags);
174
175 return rsp;
176}
177
178static inline void
179nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
180{
181 unsigned long flags;
182
183 spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
184 list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
185 spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
186}
187
188static void nvmet_rdma_free_sgl(struct scatterlist *sgl, unsigned int nents)
189{
190 struct scatterlist *sg;
191 int count;
192
193 if (!sgl || !nents)
194 return;
195
196 for_each_sg(sgl, sg, nents, count)
197 __free_page(sg_page(sg));
198 kfree(sgl);
199}
200
201static int nvmet_rdma_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
202 u32 length)
203{
204 struct scatterlist *sg;
205 struct page *page;
206 unsigned int nent;
207 int i = 0;
208
209 nent = DIV_ROUND_UP(length, PAGE_SIZE);
210 sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
211 if (!sg)
212 goto out;
213
214 sg_init_table(sg, nent);
215
216 while (length) {
217 u32 page_len = min_t(u32, length, PAGE_SIZE);
218
219 page = alloc_page(GFP_KERNEL);
220 if (!page)
221 goto out_free_pages;
222
223 sg_set_page(&sg[i], page, page_len, 0);
224 length -= page_len;
225 i++;
226 }
227 *sgl = sg;
228 *nents = nent;
229 return 0;
230
231out_free_pages:
232 while (i > 0) {
233 i--;
234 __free_page(sg_page(&sg[i]));
235 }
236 kfree(sg);
237out:
238 return NVME_SC_INTERNAL;
239}
240
241static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
242 struct nvmet_rdma_cmd *c, bool admin)
243{
244 /* NVMe command / RDMA RECV */
245 c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
246 if (!c->nvme_cmd)
247 goto out;
248
249 c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
250 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
251 if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
252 goto out_free_cmd;
253
254 c->sge[0].length = sizeof(*c->nvme_cmd);
255 c->sge[0].lkey = ndev->pd->local_dma_lkey;
256
257 if (!admin) {
258 c->inline_page = alloc_pages(GFP_KERNEL,
259 get_order(NVMET_RDMA_INLINE_DATA_SIZE));
260 if (!c->inline_page)
261 goto out_unmap_cmd;
262 c->sge[1].addr = ib_dma_map_page(ndev->device,
263 c->inline_page, 0, NVMET_RDMA_INLINE_DATA_SIZE,
264 DMA_FROM_DEVICE);
265 if (ib_dma_mapping_error(ndev->device, c->sge[1].addr))
266 goto out_free_inline_page;
267 c->sge[1].length = NVMET_RDMA_INLINE_DATA_SIZE;
268 c->sge[1].lkey = ndev->pd->local_dma_lkey;
269 }
270
271 c->cqe.done = nvmet_rdma_recv_done;
272
273 c->wr.wr_cqe = &c->cqe;
274 c->wr.sg_list = c->sge;
275 c->wr.num_sge = admin ? 1 : 2;
276
277 return 0;
278
279out_free_inline_page:
280 if (!admin) {
281 __free_pages(c->inline_page,
282 get_order(NVMET_RDMA_INLINE_DATA_SIZE));
283 }
284out_unmap_cmd:
285 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
286 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
287out_free_cmd:
288 kfree(c->nvme_cmd);
289
290out:
291 return -ENOMEM;
292}
293
294static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
295 struct nvmet_rdma_cmd *c, bool admin)
296{
297 if (!admin) {
298 ib_dma_unmap_page(ndev->device, c->sge[1].addr,
299 NVMET_RDMA_INLINE_DATA_SIZE, DMA_FROM_DEVICE);
300 __free_pages(c->inline_page,
301 get_order(NVMET_RDMA_INLINE_DATA_SIZE));
302 }
303 ib_dma_unmap_single(ndev->device, c->sge[0].addr,
304 sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
305 kfree(c->nvme_cmd);
306}
307
308static struct nvmet_rdma_cmd *
309nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
310 int nr_cmds, bool admin)
311{
312 struct nvmet_rdma_cmd *cmds;
313 int ret = -EINVAL, i;
314
315 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
316 if (!cmds)
317 goto out;
318
319 for (i = 0; i < nr_cmds; i++) {
320 ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
321 if (ret)
322 goto out_free;
323 }
324
325 return cmds;
326
327out_free:
328 while (--i >= 0)
329 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
330 kfree(cmds);
331out:
332 return ERR_PTR(ret);
333}
334
335static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
336 struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
337{
338 int i;
339
340 for (i = 0; i < nr_cmds; i++)
341 nvmet_rdma_free_cmd(ndev, cmds + i, admin);
342 kfree(cmds);
343}
344
345static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
346 struct nvmet_rdma_rsp *r)
347{
348 /* NVMe CQE / RDMA SEND */
349 r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL);
350 if (!r->req.rsp)
351 goto out;
352
353 r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp,
354 sizeof(*r->req.rsp), DMA_TO_DEVICE);
355 if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
356 goto out_free_rsp;
357
358 r->send_sge.length = sizeof(*r->req.rsp);
359 r->send_sge.lkey = ndev->pd->local_dma_lkey;
360
361 r->send_cqe.done = nvmet_rdma_send_done;
362
363 r->send_wr.wr_cqe = &r->send_cqe;
364 r->send_wr.sg_list = &r->send_sge;
365 r->send_wr.num_sge = 1;
366 r->send_wr.send_flags = IB_SEND_SIGNALED;
367
368 /* Data In / RDMA READ */
369 r->read_cqe.done = nvmet_rdma_read_data_done;
370 return 0;
371
372out_free_rsp:
373 kfree(r->req.rsp);
374out:
375 return -ENOMEM;
376}
377
378static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
379 struct nvmet_rdma_rsp *r)
380{
381 ib_dma_unmap_single(ndev->device, r->send_sge.addr,
382 sizeof(*r->req.rsp), DMA_TO_DEVICE);
383 kfree(r->req.rsp);
384}
385
386static int
387nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
388{
389 struct nvmet_rdma_device *ndev = queue->dev;
390 int nr_rsps = queue->recv_queue_size * 2;
391 int ret = -EINVAL, i;
392
393 queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
394 GFP_KERNEL);
395 if (!queue->rsps)
396 goto out;
397
398 for (i = 0; i < nr_rsps; i++) {
399 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
400
401 ret = nvmet_rdma_alloc_rsp(ndev, rsp);
402 if (ret)
403 goto out_free;
404
405 list_add_tail(&rsp->free_list, &queue->free_rsps);
406 }
407
408 return 0;
409
410out_free:
411 while (--i >= 0) {
412 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
413
414 list_del(&rsp->free_list);
415 nvmet_rdma_free_rsp(ndev, rsp);
416 }
417 kfree(queue->rsps);
418out:
419 return ret;
420}
421
422static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
423{
424 struct nvmet_rdma_device *ndev = queue->dev;
425 int i, nr_rsps = queue->recv_queue_size * 2;
426
427 for (i = 0; i < nr_rsps; i++) {
428 struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
429
430 list_del(&rsp->free_list);
431 nvmet_rdma_free_rsp(ndev, rsp);
432 }
433 kfree(queue->rsps);
434}
435
436static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
437 struct nvmet_rdma_cmd *cmd)
438{
439 struct ib_recv_wr *bad_wr;
440
441 if (ndev->srq)
442 return ib_post_srq_recv(ndev->srq, &cmd->wr, &bad_wr);
443 return ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, &bad_wr);
444}
445
446static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
447{
448 spin_lock(&queue->rsp_wr_wait_lock);
449 while (!list_empty(&queue->rsp_wr_wait_list)) {
450 struct nvmet_rdma_rsp *rsp;
451 bool ret;
452
453 rsp = list_entry(queue->rsp_wr_wait_list.next,
454 struct nvmet_rdma_rsp, wait_list);
455 list_del(&rsp->wait_list);
456
457 spin_unlock(&queue->rsp_wr_wait_lock);
458 ret = nvmet_rdma_execute_command(rsp);
459 spin_lock(&queue->rsp_wr_wait_lock);
460
461 if (!ret) {
462 list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
463 break;
464 }
465 }
466 spin_unlock(&queue->rsp_wr_wait_lock);
467}
468
469
470static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
471{
472 struct nvmet_rdma_queue *queue = rsp->queue;
473
474 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
475
476 if (rsp->n_rdma) {
477 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
478 queue->cm_id->port_num, rsp->req.sg,
479 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
480 }
481
482 if (rsp->req.sg != &rsp->cmd->inline_sg)
483 nvmet_rdma_free_sgl(rsp->req.sg, rsp->req.sg_cnt);
484
485 if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
486 nvmet_rdma_process_wr_wait_list(queue);
487
488 nvmet_rdma_put_rsp(rsp);
489}
490
491static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
492{
493 if (queue->nvme_sq.ctrl) {
494 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
495 } else {
496 /*
497 * we didn't setup the controller yet in case
498 * of admin connect error, just disconnect and
499 * cleanup the queue
500 */
501 nvmet_rdma_queue_disconnect(queue);
502 }
503}
504
505static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
506{
507 struct nvmet_rdma_rsp *rsp =
508 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
509
510 nvmet_rdma_release_rsp(rsp);
511
512 if (unlikely(wc->status != IB_WC_SUCCESS &&
513 wc->status != IB_WC_WR_FLUSH_ERR)) {
514 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
515 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
516 nvmet_rdma_error_comp(rsp->queue);
517 }
518}
519
520static void nvmet_rdma_queue_response(struct nvmet_req *req)
521{
522 struct nvmet_rdma_rsp *rsp =
523 container_of(req, struct nvmet_rdma_rsp, req);
524 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
525 struct ib_send_wr *first_wr, *bad_wr;
526
527 if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
528 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
529 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
530 } else {
531 rsp->send_wr.opcode = IB_WR_SEND;
532 }
533
534 if (nvmet_rdma_need_data_out(rsp))
535 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
536 cm_id->port_num, NULL, &rsp->send_wr);
537 else
538 first_wr = &rsp->send_wr;
539
540 nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
541 if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) {
542 pr_err("sending cmd response failed\n");
543 nvmet_rdma_release_rsp(rsp);
544 }
545}
546
547static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
548{
549 struct nvmet_rdma_rsp *rsp =
550 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
551 struct nvmet_rdma_queue *queue = cq->cq_context;
552
553 WARN_ON(rsp->n_rdma <= 0);
554 atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
555 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
556 queue->cm_id->port_num, rsp->req.sg,
557 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
558 rsp->n_rdma = 0;
559
560 if (unlikely(wc->status != IB_WC_SUCCESS)) {
561 nvmet_rdma_release_rsp(rsp);
562 if (wc->status != IB_WC_WR_FLUSH_ERR) {
563 pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
564 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
565 nvmet_rdma_error_comp(queue);
566 }
567 return;
568 }
569
570 rsp->req.execute(&rsp->req);
571}
572
573static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
574 u64 off)
575{
576 sg_init_table(&rsp->cmd->inline_sg, 1);
577 sg_set_page(&rsp->cmd->inline_sg, rsp->cmd->inline_page, len, off);
578 rsp->req.sg = &rsp->cmd->inline_sg;
579 rsp->req.sg_cnt = 1;
580}
581
582static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
583{
584 struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
585 u64 off = le64_to_cpu(sgl->addr);
586 u32 len = le32_to_cpu(sgl->length);
587
588 if (!nvme_is_write(rsp->req.cmd))
589 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
590
591 if (off + len > NVMET_RDMA_INLINE_DATA_SIZE) {
592 pr_err("invalid inline data offset!\n");
593 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
594 }
595
596 /* no data command? */
597 if (!len)
598 return 0;
599
600 nvmet_rdma_use_inline_sg(rsp, len, off);
601 rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
602 return 0;
603}
604
605static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
606 struct nvme_keyed_sgl_desc *sgl, bool invalidate)
607{
608 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
609 u64 addr = le64_to_cpu(sgl->addr);
610 u32 len = get_unaligned_le24(sgl->length);
611 u32 key = get_unaligned_le32(sgl->key);
612 int ret;
613 u16 status;
614
615 /* no data command? */
616 if (!len)
617 return 0;
618
40e64e07
SG		 619 status = nvmet_rdma_alloc_sgl(&rsp->req.sg, &rsp->req.sg_cnt,
620 len);
621 if (status)
622 return status;
8f000cac
CH		 623
624 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
625 rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
626 nvmet_data_dir(&rsp->req));
627 if (ret < 0)
628 return NVME_SC_INTERNAL;
629 rsp->n_rdma += ret;
630
631 if (invalidate) {
632 rsp->invalidate_rkey = key;
633 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
634 }
635
636 return 0;
637}
638
639static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
640{
641 struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
642
643 switch (sgl->type >> 4) {
644 case NVME_SGL_FMT_DATA_DESC:
645 switch (sgl->type & 0xf) {
646 case NVME_SGL_FMT_OFFSET:
647 return nvmet_rdma_map_sgl_inline(rsp);
648 default:
649 pr_err("invalid SGL subtype: %#x\n", sgl->type);
650 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
651 }
652 case NVME_KEY_SGL_FMT_DATA_DESC:
653 switch (sgl->type & 0xf) {
654 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
655 return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
656 case NVME_SGL_FMT_ADDRESS:
657 return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
658 default:
659 pr_err("invalid SGL subtype: %#x\n", sgl->type);
660 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
661 }
662 default:
663 pr_err("invalid SGL type: %#x\n", sgl->type);
664 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
665 }
666}
667
668static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
669{
670 struct nvmet_rdma_queue *queue = rsp->queue;
671
672 if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
673 &queue->sq_wr_avail) < 0)) {
674 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
675 1 + rsp->n_rdma, queue->idx,
676 queue->nvme_sq.ctrl->cntlid);
677 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
678 return false;
679 }
680
681 if (nvmet_rdma_need_data_in(rsp)) {
682 if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp,
683 queue->cm_id->port_num, &rsp->read_cqe, NULL))
684 nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
685 } else {
686 rsp->req.execute(&rsp->req);
687 }
688
689 return true;
690}
691
692static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
693 struct nvmet_rdma_rsp *cmd)
694{
695 u16 status;
696
697 cmd->queue = queue;
698 cmd->n_rdma = 0;
699 cmd->req.port = queue->port;
700
701 if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
702 &queue->nvme_sq, &nvmet_rdma_ops))
703 return;
704
705 status = nvmet_rdma_map_sgl(cmd);
706 if (status)
707 goto out_err;
708
709 if (unlikely(!nvmet_rdma_execute_command(cmd))) {
710 spin_lock(&queue->rsp_wr_wait_lock);
711 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
712 spin_unlock(&queue->rsp_wr_wait_lock);
713 }
714
715 return;
716
717out_err:
718 nvmet_req_complete(&cmd->req, status);
719}
720
721static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
722{
723 struct nvmet_rdma_cmd *cmd =
724 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
725 struct nvmet_rdma_queue *queue = cq->cq_context;
726 struct nvmet_rdma_rsp *rsp;
727
728 if (unlikely(wc->status != IB_WC_SUCCESS)) {
729 if (wc->status != IB_WC_WR_FLUSH_ERR) {
730 pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
731 wc->wr_cqe, ib_wc_status_msg(wc->status),
732 wc->status);
733 nvmet_rdma_error_comp(queue);
734 }
735 return;
736 }
737
738 if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
739 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
740 nvmet_rdma_error_comp(queue);
741 return;
742 }
743
744 cmd->queue = queue;
745 rsp = nvmet_rdma_get_rsp(queue);
746 rsp->cmd = cmd;
747 rsp->flags = 0;
748 rsp->req.cmd = cmd->nvme_cmd;
749
750 if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
751 unsigned long flags;
752
753 spin_lock_irqsave(&queue->state_lock, flags);
754 if (queue->state == NVMET_RDMA_Q_CONNECTING)
755 list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
756 else
757 nvmet_rdma_put_rsp(rsp);
758 spin_unlock_irqrestore(&queue->state_lock, flags);
759 return;
760 }
761
762 nvmet_rdma_handle_command(queue, rsp);
763}
764
765static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev)
766{
767 if (!ndev->srq)
768 return;
769
770 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
771 ib_destroy_srq(ndev->srq);
772}
773
774static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
775{
776 struct ib_srq_init_attr srq_attr = { NULL, };
777 struct ib_srq *srq;
778 size_t srq_size;
779 int ret, i;
780
781 srq_size = 4095; /* XXX: tune */
782
783 srq_attr.attr.max_wr = srq_size;
784 srq_attr.attr.max_sge = 2;
785 srq_attr.attr.srq_limit = 0;
786 srq_attr.srq_type = IB_SRQT_BASIC;
787 srq = ib_create_srq(ndev->pd, &srq_attr);
788 if (IS_ERR(srq)) {
789 /*
790 * If SRQs aren't supported we just go ahead and use normal
791 * non-shared receive queues.
792 */
793 pr_info("SRQ requested but not supported.\n");
794 return 0;
795 }
796
797 ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
798 if (IS_ERR(ndev->srq_cmds)) {
799 ret = PTR_ERR(ndev->srq_cmds);
800 goto out_destroy_srq;
801 }
802
803 ndev->srq = srq;
804 ndev->srq_size = srq_size;
805
806 for (i = 0; i < srq_size; i++)
807 nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]);
808
809 return 0;
810
811out_destroy_srq:
812 ib_destroy_srq(srq);
813 return ret;
814}
815
816static void nvmet_rdma_free_dev(struct kref *ref)
817{
818 struct nvmet_rdma_device *ndev =
819 container_of(ref, struct nvmet_rdma_device, ref);
820
821 mutex_lock(&device_list_mutex);
822 list_del(&ndev->entry);
823 mutex_unlock(&device_list_mutex);
824
825 nvmet_rdma_destroy_srq(ndev);
826 ib_dealloc_pd(ndev->pd);
827
828 kfree(ndev);
829}
830
831static struct nvmet_rdma_device *
832nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
833{
834 struct nvmet_rdma_device *ndev;
835 int ret;
836
837 mutex_lock(&device_list_mutex);
838 list_for_each_entry(ndev, &device_list, entry) {
839 if (ndev->device->node_guid == cm_id->device->node_guid &&
840 kref_get_unless_zero(&ndev->ref))
841 goto out_unlock;
842 }
843
844 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
845 if (!ndev)
846 goto out_err;
847
848 ndev->device = cm_id->device;
849 kref_init(&ndev->ref);
850
851 ndev->pd = ib_alloc_pd(ndev->device);
852 if (IS_ERR(ndev->pd))
853 goto out_free_dev;
854
855 if (nvmet_rdma_use_srq) {
856 ret = nvmet_rdma_init_srq(ndev);
857 if (ret)
858 goto out_free_pd;
859 }
860
861 list_add(&ndev->entry, &device_list);
862out_unlock:
863 mutex_unlock(&device_list_mutex);
864 pr_debug("added %s.\n", ndev->device->name);
865 return ndev;
866
867out_free_pd:
868 ib_dealloc_pd(ndev->pd);
869out_free_dev:
870 kfree(ndev);
871out_err:
872 mutex_unlock(&device_list_mutex);
873 return NULL;
874}
875
876static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
877{
878 struct ib_qp_init_attr qp_attr;
879 struct nvmet_rdma_device *ndev = queue->dev;
880 int comp_vector, nr_cqe, ret, i;
881
882 /*
883 * Spread the io queues across completion vectors,
884 * but still keep all admin queues on vector 0.
885 */
886 comp_vector = !queue->host_qid ? 0 :
887 queue->idx % ndev->device->num_comp_vectors;
888
889 /*
890 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
891 */
892 nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
893
894 queue->cq = ib_alloc_cq(ndev->device, queue,
895 nr_cqe + 1, comp_vector,
896 IB_POLL_WORKQUEUE);
897 if (IS_ERR(queue->cq)) {
898 ret = PTR_ERR(queue->cq);
899 pr_err("failed to create CQ cqe= %d ret= %d\n",
900 nr_cqe + 1, ret);
901 goto out;
902 }
903
904 memset(&qp_attr, 0, sizeof(qp_attr));
905 qp_attr.qp_context = queue;
906 qp_attr.event_handler = nvmet_rdma_qp_event;
907 qp_attr.send_cq = queue->cq;
908 qp_attr.recv_cq = queue->cq;
909 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
910 qp_attr.qp_type = IB_QPT_RC;
911 /* +1 for drain */
912 qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
913 qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
914 qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
915 ndev->device->attrs.max_sge);
916
917 if (ndev->srq) {
918 qp_attr.srq = ndev->srq;
919 } else {
920 /* +1 for drain */
921 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
922 qp_attr.cap.max_recv_sge = 2;
923 }
924
925 ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
926 if (ret) {
927 pr_err("failed to create_qp ret= %d\n", ret);
928 goto err_destroy_cq;
929 }
930
931 atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
932
933 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
934 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
935 qp_attr.cap.max_send_wr, queue->cm_id);
936
937 if (!ndev->srq) {
938 for (i = 0; i < queue->recv_queue_size; i++) {
939 queue->cmds[i].queue = queue;
940 nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
941 }
942 }
943
944out:
945 return ret;
946
947err_destroy_cq:
948 ib_free_cq(queue->cq);
949 goto out;
950}
951
952static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
953{
954 rdma_destroy_qp(queue->cm_id);
955 ib_free_cq(queue->cq);
956}
957
958static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
959{
960 pr_info("freeing queue %d\n", queue->idx);
961
962 nvmet_sq_destroy(&queue->nvme_sq);
963
964 nvmet_rdma_destroy_queue_ib(queue);
965 if (!queue->dev->srq) {
966 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
967 queue->recv_queue_size,
968 !queue->host_qid);
969 }
970 nvmet_rdma_free_rsps(queue);
971 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
972 kfree(queue);
973}
974
975static void nvmet_rdma_release_queue_work(struct work_struct *w)
976{
977 struct nvmet_rdma_queue *queue =
978 container_of(w, struct nvmet_rdma_queue, release_work);
979 struct rdma_cm_id *cm_id = queue->cm_id;
980 struct nvmet_rdma_device *dev = queue->dev;
981
982 nvmet_rdma_free_queue(queue);
d8f7750a
SG		 983
984 if (queue->state != NVMET_RDMA_IN_DEVICE_REMOVAL)
985 rdma_destroy_id(cm_id);
986
8f000cac
CH		 987 kref_put(&dev->ref, nvmet_rdma_free_dev);
988}
989
990static int
991nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
992 struct nvmet_rdma_queue *queue)
993{
994 struct nvme_rdma_cm_req *req;
995
996 req = (struct nvme_rdma_cm_req *)conn->private_data;
997 if (!req || conn->private_data_len == 0)
998 return NVME_RDMA_CM_INVALID_LEN;
999
1000 if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1001 return NVME_RDMA_CM_INVALID_RECFMT;
1002
1003 queue->host_qid = le16_to_cpu(req->qid);
1004
1005 /*
1006 * req->hsqsize corresponds to our recv queue size
1007 * req->hrqsize corresponds to our send queue size
1008 */
1009 queue->recv_queue_size = le16_to_cpu(req->hsqsize);
1010 queue->send_queue_size = le16_to_cpu(req->hrqsize);
1011
1012 if (!queue->host_qid && queue->recv_queue_size > NVMF_AQ_DEPTH)
1013 return NVME_RDMA_CM_INVALID_HSQSIZE;
1014
1015 /* XXX: Should we enforce some kind of max for IO queues? */
1016
1017 return 0;
1018}
1019
1020static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1021 enum nvme_rdma_cm_status status)
1022{
1023 struct nvme_rdma_cm_rej rej;
1024
1025 rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1026 rej.sts = cpu_to_le16(status);
1027
1028 return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
1029}
1030
1031static struct nvmet_rdma_queue *
1032nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1033 struct rdma_cm_id *cm_id,
1034 struct rdma_cm_event *event)
1035{
1036 struct nvmet_rdma_queue *queue;
1037 int ret;
1038
1039 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1040 if (!queue) {
1041 ret = NVME_RDMA_CM_NO_RSC;
1042 goto out_reject;
1043 }
1044
1045 ret = nvmet_sq_init(&queue->nvme_sq);
1046 if (ret)
1047 goto out_free_queue;
1048
1049 ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1050 if (ret)
1051 goto out_destroy_sq;
1052
1053 /*
1054 * Schedules the actual release because calling rdma_destroy_id from
1055 * inside a CM callback would trigger a deadlock. (great API design..)
1056 */
1057 INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1058 queue->dev = ndev;
1059 queue->cm_id = cm_id;
1060
1061 spin_lock_init(&queue->state_lock);
1062 queue->state = NVMET_RDMA_Q_CONNECTING;
1063 INIT_LIST_HEAD(&queue->rsp_wait_list);
1064 INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1065 spin_lock_init(&queue->rsp_wr_wait_lock);
1066 INIT_LIST_HEAD(&queue->free_rsps);
1067 spin_lock_init(&queue->rsps_lock);
1068
1069 queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
1070 if (queue->idx < 0) {
1071 ret = NVME_RDMA_CM_NO_RSC;
1072 goto out_free_queue;
1073 }
1074
1075 ret = nvmet_rdma_alloc_rsps(queue);
1076 if (ret) {
1077 ret = NVME_RDMA_CM_NO_RSC;
1078 goto out_ida_remove;
1079 }
1080
1081 if (!ndev->srq) {
1082 queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1083 queue->recv_queue_size,
1084 !queue->host_qid);
1085 if (IS_ERR(queue->cmds)) {
1086 ret = NVME_RDMA_CM_NO_RSC;
1087 goto out_free_responses;
1088 }
1089 }
1090
1091 ret = nvmet_rdma_create_queue_ib(queue);
1092 if (ret) {
1093 pr_err("%s: creating RDMA queue failed (%d).\n",
1094 __func__, ret);
1095 ret = NVME_RDMA_CM_NO_RSC;
1096 goto out_free_cmds;
1097 }
1098
1099 return queue;
1100
1101out_free_cmds:
1102 if (!ndev->srq) {
1103 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1104 queue->recv_queue_size,
1105 !queue->host_qid);
1106 }
1107out_free_responses:
1108 nvmet_rdma_free_rsps(queue);
1109out_ida_remove:
1110 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1111out_destroy_sq:
1112 nvmet_sq_destroy(&queue->nvme_sq);
1113out_free_queue:
1114 kfree(queue);
1115out_reject:
1116 nvmet_rdma_cm_reject(cm_id, ret);
1117 return NULL;
1118}
1119
1120static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1121{
1122 struct nvmet_rdma_queue *queue = priv;
1123
1124 switch (event->event) {
1125 case IB_EVENT_COMM_EST:
1126 rdma_notify(queue->cm_id, event->event);
1127 break;
1128 default:
1129 pr_err("received unrecognized IB QP event %d\n", event->event);
1130 break;
1131 }
1132}
1133
1134static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1135 struct nvmet_rdma_queue *queue,
1136 struct rdma_conn_param *p)
1137{
1138 struct rdma_conn_param param = { };
1139 struct nvme_rdma_cm_rep priv = { };
1140 int ret = -ENOMEM;
1141
1142 param.rnr_retry_count = 7;
1143 param.flow_control = 1;
1144 param.initiator_depth = min_t(u8, p->initiator_depth,
1145 queue->dev->device->attrs.max_qp_init_rd_atom);
1146 param.private_data = &priv;
1147 param.private_data_len = sizeof(priv);
1148 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1149 priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1150
1151 ret = rdma_accept(cm_id, &param);
1152 if (ret)
1153 pr_err("rdma_accept failed (error code = %d)\n", ret);
1154
1155 return ret;
1156}
1157
1158static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1159 struct rdma_cm_event *event)
1160{
1161 struct nvmet_rdma_device *ndev;
1162 struct nvmet_rdma_queue *queue;
1163 int ret = -EINVAL;
1164
1165 ndev = nvmet_rdma_find_get_device(cm_id);
1166 if (!ndev) {
1167 pr_err("no client data!\n");
1168 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1169 return -ECONNREFUSED;
1170 }
1171
1172 queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1173 if (!queue) {
1174 ret = -ENOMEM;
1175 goto put_device;
1176 }
1177 queue->port = cm_id->context;
1178
1179 ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1180 if (ret)
1181 goto release_queue;
1182
1183 mutex_lock(&nvmet_rdma_queue_mutex);
1184 list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1185 mutex_unlock(&nvmet_rdma_queue_mutex);
1186
1187 return 0;
1188
1189release_queue:
1190 nvmet_rdma_free_queue(queue);
1191put_device:
1192 kref_put(&ndev->ref, nvmet_rdma_free_dev);
1193
1194 return ret;
1195}
1196
1197static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1198{
1199 unsigned long flags;
1200
1201 spin_lock_irqsave(&queue->state_lock, flags);
1202 if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1203 pr_warn("trying to establish a connected queue\n");
1204 goto out_unlock;
1205 }
1206 queue->state = NVMET_RDMA_Q_LIVE;
1207
1208 while (!list_empty(&queue->rsp_wait_list)) {
1209 struct nvmet_rdma_rsp *cmd;
1210
1211 cmd = list_first_entry(&queue->rsp_wait_list,
1212 struct nvmet_rdma_rsp, wait_list);
1213 list_del(&cmd->wait_list);
1214
1215 spin_unlock_irqrestore(&queue->state_lock, flags);
1216 nvmet_rdma_handle_command(queue, cmd);
1217 spin_lock_irqsave(&queue->state_lock, flags);
1218 }
1219
1220out_unlock:
1221 spin_unlock_irqrestore(&queue->state_lock, flags);
1222}
1223
1224static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1225{
1226 bool disconnect = false;
1227 unsigned long flags;
1228
1229 pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1230
1231 spin_lock_irqsave(&queue->state_lock, flags);
1232 switch (queue->state) {
1233 case NVMET_RDMA_Q_CONNECTING:
1234 case NVMET_RDMA_Q_LIVE:
8f000cac 1235 queue->state = NVMET_RDMA_Q_DISCONNECTING;
d8f7750a
SG		 1236 case NVMET_RDMA_IN_DEVICE_REMOVAL:
1237 disconnect = true;
8f000cac
CH		 1238 break;
1239 case NVMET_RDMA_Q_DISCONNECTING:
1240 break;
1241 }
1242 spin_unlock_irqrestore(&queue->state_lock, flags);
1243
1244 if (disconnect) {
1245 rdma_disconnect(queue->cm_id);
1246 ib_drain_qp(queue->cm_id->qp);
1247 schedule_work(&queue->release_work);
1248 }
1249}
1250
1251static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1252{
1253 bool disconnect = false;
1254
1255 mutex_lock(&nvmet_rdma_queue_mutex);
1256 if (!list_empty(&queue->queue_list)) {
1257 list_del_init(&queue->queue_list);
1258 disconnect = true;
1259 }
1260 mutex_unlock(&nvmet_rdma_queue_mutex);
1261
1262 if (disconnect)
1263 __nvmet_rdma_queue_disconnect(queue);
1264}
1265
1266static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1267 struct nvmet_rdma_queue *queue)
1268{
1269 WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1270
1271 pr_err("failed to connect queue\n");
1272 schedule_work(&queue->release_work);
1273}
1274
d8f7750a
SG		 1275/**
1276 * nvme_rdma_device_removal() - Handle RDMA device removal
1277 * @queue: nvmet rdma queue (cm id qp_context)
1278 * @addr: nvmet address (cm_id context)
1279 *
1280 * DEVICE_REMOVAL event notifies us that the RDMA device is about
1281 * to unplug so we should take care of destroying our RDMA resources.
1282 * This event will be generated for each allocated cm_id.
1283 *
1284 * Note that this event can be generated on a normal queue cm_id
1285 * and/or a device bound listener cm_id (where in this case
1286 * queue will be null).
1287 *
1288 * we claim ownership on destroying the cm_id. For queues we move
1289 * the queue state to NVMET_RDMA_IN_DEVICE_REMOVAL and for port
1290 * we nullify the priv to prevent double cm_id destruction and destroying
1291 * the cm_id implicitely by returning a non-zero rc to the callout.
1292 */
1293static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1294 struct nvmet_rdma_queue *queue)
1295{
1296 unsigned long flags;
1297
1298 if (!queue) {
1299 struct nvmet_port *port = cm_id->context;
1300
1301 /*
1302 * This is a listener cm_id. Make sure that
1303 * future remove_port won't invoke a double
1304 * cm_id destroy. use atomic xchg to make sure
1305 * we don't compete with remove_port.
1306 */
1307 if (xchg(&port->priv, NULL) != cm_id)
1308 return 0;
1309 } else {
1310 /*
1311 * This is a queue cm_id. Make sure that
1312 * release queue will not destroy the cm_id
1313 * and schedule all ctrl queues removal (only
1314 * if the queue is not disconnecting already).
1315 */
1316 spin_lock_irqsave(&queue->state_lock, flags);
1317 if (queue->state != NVMET_RDMA_Q_DISCONNECTING)
1318 queue->state = NVMET_RDMA_IN_DEVICE_REMOVAL;
1319 spin_unlock_irqrestore(&queue->state_lock, flags);
1320 nvmet_rdma_queue_disconnect(queue);
1321 flush_scheduled_work();
1322 }
1323
1324 /*
1325 * We need to return 1 so that the core will destroy
1326 * it's own ID. What a great API design..
1327 */
1328 return 1;
1329}
1330
8f000cac
CH		 1331static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1332 struct rdma_cm_event *event)
1333{
1334 struct nvmet_rdma_queue *queue = NULL;
1335 int ret = 0;
1336
1337 if (cm_id->qp)
1338 queue = cm_id->qp->qp_context;
1339
1340 pr_debug("%s (%d): status %d id %p\n",
1341 rdma_event_msg(event->event), event->event,
1342 event->status, cm_id);
1343
1344 switch (event->event) {
1345 case RDMA_CM_EVENT_CONNECT_REQUEST:
1346 ret = nvmet_rdma_queue_connect(cm_id, event);
1347 break;
1348 case RDMA_CM_EVENT_ESTABLISHED:
1349 nvmet_rdma_queue_established(queue);
1350 break;
1351 case RDMA_CM_EVENT_ADDR_CHANGE:
1352 case RDMA_CM_EVENT_DISCONNECTED:
8f000cac 1353 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
d8f7750a
SG		 1354 nvmet_rdma_queue_disconnect(queue);
1355 break;
1356 case RDMA_CM_EVENT_DEVICE_REMOVAL:
1357 ret = nvmet_rdma_device_removal(cm_id, queue);
8f000cac
CH		 1358 break;
1359 case RDMA_CM_EVENT_REJECTED:
1360 case RDMA_CM_EVENT_UNREACHABLE:
1361 case RDMA_CM_EVENT_CONNECT_ERROR:
1362 nvmet_rdma_queue_connect_fail(cm_id, queue);
1363 break;
1364 default:
1365 pr_err("received unrecognized RDMA CM event %d\n",
1366 event->event);
1367 break;
1368 }
1369
1370 return ret;
1371}
1372
1373static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1374{
1375 struct nvmet_rdma_queue *queue;
1376
1377restart:
1378 mutex_lock(&nvmet_rdma_queue_mutex);
1379 list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
1380 if (queue->nvme_sq.ctrl == ctrl) {
1381 list_del_init(&queue->queue_list);
1382 mutex_unlock(&nvmet_rdma_queue_mutex);
1383
1384 __nvmet_rdma_queue_disconnect(queue);
1385 goto restart;
1386 }
1387 }
1388 mutex_unlock(&nvmet_rdma_queue_mutex);
1389}
1390
1391static int nvmet_rdma_add_port(struct nvmet_port *port)
1392{
1393 struct rdma_cm_id *cm_id;
1394 struct sockaddr_in addr_in;
1395 u16 port_in;
1396 int ret;
1397
1398 switch (port->disc_addr.adrfam) {
1399 case NVMF_ADDR_FAMILY_IP4:
1400 break;
1401 default:
1402 pr_err("address family %d not supported\n",
1403 port->disc_addr.adrfam);
1404 return -EINVAL;
1405 }
1406
1407 ret = kstrtou16(port->disc_addr.trsvcid, 0, &port_in);
1408 if (ret)
1409 return ret;
1410
1411 addr_in.sin_family = AF_INET;
1412 addr_in.sin_addr.s_addr = in_aton(port->disc_addr.traddr);
1413 addr_in.sin_port = htons(port_in);
1414
1415 cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1416 RDMA_PS_TCP, IB_QPT_RC);
1417 if (IS_ERR(cm_id)) {
1418 pr_err("CM ID creation failed\n");
1419 return PTR_ERR(cm_id);
1420 }
1421
1422 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr_in);
1423 if (ret) {
1424 pr_err("binding CM ID to %pISpc failed (%d)\n", &addr_in, ret);
1425 goto out_destroy_id;
1426 }
1427
1428 ret = rdma_listen(cm_id, 128);
1429 if (ret) {
1430 pr_err("listening to %pISpc failed (%d)\n", &addr_in, ret);
1431 goto out_destroy_id;
1432 }
1433
1434 pr_info("enabling port %d (%pISpc)\n",
1435 le16_to_cpu(port->disc_addr.portid), &addr_in);
1436 port->priv = cm_id;
1437 return 0;
1438
1439out_destroy_id:
1440 rdma_destroy_id(cm_id);
1441 return ret;
1442}
1443
1444static void nvmet_rdma_remove_port(struct nvmet_port *port)
1445{
d8f7750a 1446 struct rdma_cm_id *cm_id = xchg(&port->priv, NULL);
8f000cac 1447
d8f7750a
SG		 1448 if (cm_id)
1449 rdma_destroy_id(cm_id);
8f000cac
CH		 1450}
1451
1452static struct nvmet_fabrics_ops nvmet_rdma_ops = {
1453 .owner = THIS_MODULE,
1454 .type = NVMF_TRTYPE_RDMA,
1455 .sqe_inline_size = NVMET_RDMA_INLINE_DATA_SIZE,
1456 .msdbd = 1,
1457 .has_keyed_sgls = 1,
1458 .add_port = nvmet_rdma_add_port,
1459 .remove_port = nvmet_rdma_remove_port,
1460 .queue_response = nvmet_rdma_queue_response,
1461 .delete_ctrl = nvmet_rdma_delete_ctrl,
1462};
1463
1464static int __init nvmet_rdma_init(void)
1465{
1466 return nvmet_register_transport(&nvmet_rdma_ops);
1467}
1468
1469static void __exit nvmet_rdma_exit(void)
1470{
1471 struct nvmet_rdma_queue *queue;
1472
1473 nvmet_unregister_transport(&nvmet_rdma_ops);
1474
1475 flush_scheduled_work();
1476
1477 mutex_lock(&nvmet_rdma_queue_mutex);
1478 while ((queue = list_first_entry_or_null(&nvmet_rdma_queue_list,
1479 struct nvmet_rdma_queue, queue_list))) {
1480 list_del_init(&queue->queue_list);
1481
1482 mutex_unlock(&nvmet_rdma_queue_mutex);
1483 __nvmet_rdma_queue_disconnect(queue);
1484 mutex_lock(&nvmet_rdma_queue_mutex);
1485 }
1486 mutex_unlock(&nvmet_rdma_queue_mutex);
1487
1488 flush_scheduled_work();
1489 ida_destroy(&nvmet_rdma_queue_ida);
1490}
1491
1492module_init(nvmet_rdma_init);
1493module_exit(nvmet_rdma_exit);
1494
1495MODULE_LICENSE("GPL v2");
1496MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */
Linux kernel - Deliverables
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