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[mirror_ubuntu-bionic-kernel.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
748ff840
PP		 441 ib_dma_sync_single_for_device(ndev->device,
442 cmd->sge[0].addr, cmd->sge[0].length,
443 DMA_FROM_DEVICE);
444
8f000cac
CH		 445 if (ndev->srq)
446 return ib_post_srq_recv(ndev->srq, &cmd->wr, &bad_wr);
447 return ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, &bad_wr);
448}
449
450static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
451{
452 spin_lock(&queue->rsp_wr_wait_lock);
453 while (!list_empty(&queue->rsp_wr_wait_list)) {
454 struct nvmet_rdma_rsp *rsp;
455 bool ret;
456
457 rsp = list_entry(queue->rsp_wr_wait_list.next,
458 struct nvmet_rdma_rsp, wait_list);
459 list_del(&rsp->wait_list);
460
461 spin_unlock(&queue->rsp_wr_wait_lock);
462 ret = nvmet_rdma_execute_command(rsp);
463 spin_lock(&queue->rsp_wr_wait_lock);
464
465 if (!ret) {
466 list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
467 break;
468 }
469 }
470 spin_unlock(&queue->rsp_wr_wait_lock);
471}
472
473
474static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
475{
476 struct nvmet_rdma_queue *queue = rsp->queue;
477
478 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
479
480 if (rsp->n_rdma) {
481 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
482 queue->cm_id->port_num, rsp->req.sg,
483 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
484 }
485
486 if (rsp->req.sg != &rsp->cmd->inline_sg)
487 nvmet_rdma_free_sgl(rsp->req.sg, rsp->req.sg_cnt);
488
489 if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
490 nvmet_rdma_process_wr_wait_list(queue);
491
492 nvmet_rdma_put_rsp(rsp);
493}
494
495static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
496{
497 if (queue->nvme_sq.ctrl) {
498 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
499 } else {
500 /*
501 * we didn't setup the controller yet in case
502 * of admin connect error, just disconnect and
503 * cleanup the queue
504 */
505 nvmet_rdma_queue_disconnect(queue);
506 }
507}
508
509static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
510{
511 struct nvmet_rdma_rsp *rsp =
512 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
513
514 nvmet_rdma_release_rsp(rsp);
515
516 if (unlikely(wc->status != IB_WC_SUCCESS &&
517 wc->status != IB_WC_WR_FLUSH_ERR)) {
518 pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
519 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
520 nvmet_rdma_error_comp(rsp->queue);
521 }
522}
523
524static void nvmet_rdma_queue_response(struct nvmet_req *req)
525{
526 struct nvmet_rdma_rsp *rsp =
527 container_of(req, struct nvmet_rdma_rsp, req);
528 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
529 struct ib_send_wr *first_wr, *bad_wr;
530
531 if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
532 rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
533 rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
534 } else {
535 rsp->send_wr.opcode = IB_WR_SEND;
536 }
537
538 if (nvmet_rdma_need_data_out(rsp))
539 first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
540 cm_id->port_num, NULL, &rsp->send_wr);
541 else
542 first_wr = &rsp->send_wr;
543
544 nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
748ff840
PP		 545
546 ib_dma_sync_single_for_device(rsp->queue->dev->device,
547 rsp->send_sge.addr, rsp->send_sge.length,
548 DMA_TO_DEVICE);
549
8f000cac
CH		 550 if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) {
551 pr_err("sending cmd response failed\n");
552 nvmet_rdma_release_rsp(rsp);
553 }
554}
555
556static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
557{
558 struct nvmet_rdma_rsp *rsp =
559 container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
560 struct nvmet_rdma_queue *queue = cq->cq_context;
561
562 WARN_ON(rsp->n_rdma <= 0);
563 atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
564 rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
565 queue->cm_id->port_num, rsp->req.sg,
566 rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
567 rsp->n_rdma = 0;
568
569 if (unlikely(wc->status != IB_WC_SUCCESS)) {
570 nvmet_rdma_release_rsp(rsp);
571 if (wc->status != IB_WC_WR_FLUSH_ERR) {
572 pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
573 wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
574 nvmet_rdma_error_comp(queue);
575 }
576 return;
577 }
578
579 rsp->req.execute(&rsp->req);
580}
581
582static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
583 u64 off)
584{
585 sg_init_table(&rsp->cmd->inline_sg, 1);
586 sg_set_page(&rsp->cmd->inline_sg, rsp->cmd->inline_page, len, off);
587 rsp->req.sg = &rsp->cmd->inline_sg;
588 rsp->req.sg_cnt = 1;
589}
590
591static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
592{
593 struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
594 u64 off = le64_to_cpu(sgl->addr);
595 u32 len = le32_to_cpu(sgl->length);
596
597 if (!nvme_is_write(rsp->req.cmd))
598 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
599
600 if (off + len > NVMET_RDMA_INLINE_DATA_SIZE) {
601 pr_err("invalid inline data offset!\n");
602 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
603 }
604
605 /* no data command? */
606 if (!len)
607 return 0;
608
609 nvmet_rdma_use_inline_sg(rsp, len, off);
610 rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
611 return 0;
612}
613
614static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
615 struct nvme_keyed_sgl_desc *sgl, bool invalidate)
616{
617 struct rdma_cm_id *cm_id = rsp->queue->cm_id;
618 u64 addr = le64_to_cpu(sgl->addr);
619 u32 len = get_unaligned_le24(sgl->length);
620 u32 key = get_unaligned_le32(sgl->key);
621 int ret;
622 u16 status;
623
624 /* no data command? */
625 if (!len)
626 return 0;
627
40e64e07
SG		 628 status = nvmet_rdma_alloc_sgl(&rsp->req.sg, &rsp->req.sg_cnt,
629 len);
630 if (status)
631 return status;
8f000cac
CH		 632
633 ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
634 rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
635 nvmet_data_dir(&rsp->req));
636 if (ret < 0)
637 return NVME_SC_INTERNAL;
638 rsp->n_rdma += ret;
639
640 if (invalidate) {
641 rsp->invalidate_rkey = key;
642 rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
643 }
644
645 return 0;
646}
647
648static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
649{
650 struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
651
652 switch (sgl->type >> 4) {
653 case NVME_SGL_FMT_DATA_DESC:
654 switch (sgl->type & 0xf) {
655 case NVME_SGL_FMT_OFFSET:
656 return nvmet_rdma_map_sgl_inline(rsp);
657 default:
658 pr_err("invalid SGL subtype: %#x\n", sgl->type);
659 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
660 }
661 case NVME_KEY_SGL_FMT_DATA_DESC:
662 switch (sgl->type & 0xf) {
663 case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
664 return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
665 case NVME_SGL_FMT_ADDRESS:
666 return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
667 default:
668 pr_err("invalid SGL subtype: %#x\n", sgl->type);
669 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
670 }
671 default:
672 pr_err("invalid SGL type: %#x\n", sgl->type);
673 return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
674 }
675}
676
677static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
678{
679 struct nvmet_rdma_queue *queue = rsp->queue;
680
681 if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
682 &queue->sq_wr_avail) < 0)) {
683 pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
684 1 + rsp->n_rdma, queue->idx,
685 queue->nvme_sq.ctrl->cntlid);
686 atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
687 return false;
688 }
689
690 if (nvmet_rdma_need_data_in(rsp)) {
691 if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp,
692 queue->cm_id->port_num, &rsp->read_cqe, NULL))
693 nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
694 } else {
695 rsp->req.execute(&rsp->req);
696 }
697
698 return true;
699}
700
701static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
702 struct nvmet_rdma_rsp *cmd)
703{
704 u16 status;
705
748ff840
PP		 706 ib_dma_sync_single_for_cpu(queue->dev->device,
707 cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
708 DMA_FROM_DEVICE);
709 ib_dma_sync_single_for_cpu(queue->dev->device,
710 cmd->send_sge.addr, cmd->send_sge.length,
711 DMA_TO_DEVICE);
712
8f000cac
CH		 713 if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
714 &queue->nvme_sq, &nvmet_rdma_ops))
715 return;
716
717 status = nvmet_rdma_map_sgl(cmd);
718 if (status)
719 goto out_err;
720
721 if (unlikely(!nvmet_rdma_execute_command(cmd))) {
722 spin_lock(&queue->rsp_wr_wait_lock);
723 list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
724 spin_unlock(&queue->rsp_wr_wait_lock);
725 }
726
727 return;
728
729out_err:
730 nvmet_req_complete(&cmd->req, status);
731}
732
733static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
734{
735 struct nvmet_rdma_cmd *cmd =
736 container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
737 struct nvmet_rdma_queue *queue = cq->cq_context;
738 struct nvmet_rdma_rsp *rsp;
739
740 if (unlikely(wc->status != IB_WC_SUCCESS)) {
741 if (wc->status != IB_WC_WR_FLUSH_ERR) {
742 pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
743 wc->wr_cqe, ib_wc_status_msg(wc->status),
744 wc->status);
745 nvmet_rdma_error_comp(queue);
746 }
747 return;
748 }
749
750 if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
751 pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
752 nvmet_rdma_error_comp(queue);
753 return;
754 }
755
756 cmd->queue = queue;
757 rsp = nvmet_rdma_get_rsp(queue);
b25634e2 758 rsp->queue = queue;
8f000cac
CH		 759 rsp->cmd = cmd;
760 rsp->flags = 0;
761 rsp->req.cmd = cmd->nvme_cmd;
b25634e2
SG		 762 rsp->req.port = queue->port;
763 rsp->n_rdma = 0;
8f000cac
CH		 764
765 if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
766 unsigned long flags;
767
768 spin_lock_irqsave(&queue->state_lock, flags);
769 if (queue->state == NVMET_RDMA_Q_CONNECTING)
770 list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
771 else
772 nvmet_rdma_put_rsp(rsp);
773 spin_unlock_irqrestore(&queue->state_lock, flags);
774 return;
775 }
776
777 nvmet_rdma_handle_command(queue, rsp);
778}
779
780static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev)
781{
782 if (!ndev->srq)
783 return;
784
785 nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
786 ib_destroy_srq(ndev->srq);
787}
788
789static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
790{
791 struct ib_srq_init_attr srq_attr = { NULL, };
792 struct ib_srq *srq;
793 size_t srq_size;
794 int ret, i;
795
796 srq_size = 4095; /* XXX: tune */
797
798 srq_attr.attr.max_wr = srq_size;
799 srq_attr.attr.max_sge = 2;
800 srq_attr.attr.srq_limit = 0;
801 srq_attr.srq_type = IB_SRQT_BASIC;
802 srq = ib_create_srq(ndev->pd, &srq_attr);
803 if (IS_ERR(srq)) {
804 /*
805 * If SRQs aren't supported we just go ahead and use normal
806 * non-shared receive queues.
807 */
808 pr_info("SRQ requested but not supported.\n");
809 return 0;
810 }
811
812 ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
813 if (IS_ERR(ndev->srq_cmds)) {
814 ret = PTR_ERR(ndev->srq_cmds);
815 goto out_destroy_srq;
816 }
817
818 ndev->srq = srq;
819 ndev->srq_size = srq_size;
820
821 for (i = 0; i < srq_size; i++)
822 nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]);
823
824 return 0;
825
826out_destroy_srq:
827 ib_destroy_srq(srq);
828 return ret;
829}
830
831static void nvmet_rdma_free_dev(struct kref *ref)
832{
833 struct nvmet_rdma_device *ndev =
834 container_of(ref, struct nvmet_rdma_device, ref);
835
836 mutex_lock(&device_list_mutex);
837 list_del(&ndev->entry);
838 mutex_unlock(&device_list_mutex);
839
840 nvmet_rdma_destroy_srq(ndev);
841 ib_dealloc_pd(ndev->pd);
842
843 kfree(ndev);
844}
845
846static struct nvmet_rdma_device *
847nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
848{
849 struct nvmet_rdma_device *ndev;
850 int ret;
851
852 mutex_lock(&device_list_mutex);
853 list_for_each_entry(ndev, &device_list, entry) {
854 if (ndev->device->node_guid == cm_id->device->node_guid &&
855 kref_get_unless_zero(&ndev->ref))
856 goto out_unlock;
857 }
858
859 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
860 if (!ndev)
861 goto out_err;
862
863 ndev->device = cm_id->device;
864 kref_init(&ndev->ref);
865
ed082d36 866 ndev->pd = ib_alloc_pd(ndev->device, 0);
8f000cac
CH		 867 if (IS_ERR(ndev->pd))
868 goto out_free_dev;
869
870 if (nvmet_rdma_use_srq) {
871 ret = nvmet_rdma_init_srq(ndev);
872 if (ret)
873 goto out_free_pd;
874 }
875
876 list_add(&ndev->entry, &device_list);
877out_unlock:
878 mutex_unlock(&device_list_mutex);
879 pr_debug("added %s.\n", ndev->device->name);
880 return ndev;
881
882out_free_pd:
883 ib_dealloc_pd(ndev->pd);
884out_free_dev:
885 kfree(ndev);
886out_err:
887 mutex_unlock(&device_list_mutex);
888 return NULL;
889}
890
891static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
892{
893 struct ib_qp_init_attr qp_attr;
894 struct nvmet_rdma_device *ndev = queue->dev;
895 int comp_vector, nr_cqe, ret, i;
896
897 /*
898 * Spread the io queues across completion vectors,
899 * but still keep all admin queues on vector 0.
900 */
901 comp_vector = !queue->host_qid ? 0 :
902 queue->idx % ndev->device->num_comp_vectors;
903
904 /*
905 * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
906 */
907 nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
908
909 queue->cq = ib_alloc_cq(ndev->device, queue,
910 nr_cqe + 1, comp_vector,
911 IB_POLL_WORKQUEUE);
912 if (IS_ERR(queue->cq)) {
913 ret = PTR_ERR(queue->cq);
914 pr_err("failed to create CQ cqe= %d ret= %d\n",
915 nr_cqe + 1, ret);
916 goto out;
917 }
918
919 memset(&qp_attr, 0, sizeof(qp_attr));
920 qp_attr.qp_context = queue;
921 qp_attr.event_handler = nvmet_rdma_qp_event;
922 qp_attr.send_cq = queue->cq;
923 qp_attr.recv_cq = queue->cq;
924 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
925 qp_attr.qp_type = IB_QPT_RC;
926 /* +1 for drain */
927 qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
928 qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
929 qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
930 ndev->device->attrs.max_sge);
931
932 if (ndev->srq) {
933 qp_attr.srq = ndev->srq;
934 } else {
935 /* +1 for drain */
936 qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
937 qp_attr.cap.max_recv_sge = 2;
938 }
939
940 ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
941 if (ret) {
942 pr_err("failed to create_qp ret= %d\n", ret);
943 goto err_destroy_cq;
944 }
945
946 atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
947
948 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
949 __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
950 qp_attr.cap.max_send_wr, queue->cm_id);
951
952 if (!ndev->srq) {
953 for (i = 0; i < queue->recv_queue_size; i++) {
954 queue->cmds[i].queue = queue;
955 nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
956 }
957 }
958
959out:
960 return ret;
961
962err_destroy_cq:
963 ib_free_cq(queue->cq);
964 goto out;
965}
966
967static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
968{
14c862db 969 ib_drain_qp(queue->cm_id->qp);
8f000cac
CH		 970 rdma_destroy_qp(queue->cm_id);
971 ib_free_cq(queue->cq);
972}
973
974static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
975{
976 pr_info("freeing queue %d\n", queue->idx);
977
978 nvmet_sq_destroy(&queue->nvme_sq);
979
980 nvmet_rdma_destroy_queue_ib(queue);
981 if (!queue->dev->srq) {
982 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
983 queue->recv_queue_size,
984 !queue->host_qid);
985 }
986 nvmet_rdma_free_rsps(queue);
987 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
988 kfree(queue);
989}
990
991static void nvmet_rdma_release_queue_work(struct work_struct *w)
992{
993 struct nvmet_rdma_queue *queue =
994 container_of(w, struct nvmet_rdma_queue, release_work);
995 struct rdma_cm_id *cm_id = queue->cm_id;
996 struct nvmet_rdma_device *dev = queue->dev;
3256aaef 997 enum nvmet_rdma_queue_state state = queue->state;
8f000cac
CH		 998
999 nvmet_rdma_free_queue(queue);
d8f7750a 1000
3256aaef 1001 if (state != NVMET_RDMA_IN_DEVICE_REMOVAL)
d8f7750a
SG		 1002 rdma_destroy_id(cm_id);
1003
8f000cac
CH		 1004 kref_put(&dev->ref, nvmet_rdma_free_dev);
1005}
1006
1007static int
1008nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
1009 struct nvmet_rdma_queue *queue)
1010{
1011 struct nvme_rdma_cm_req *req;
1012
1013 req = (struct nvme_rdma_cm_req *)conn->private_data;
1014 if (!req || conn->private_data_len == 0)
1015 return NVME_RDMA_CM_INVALID_LEN;
1016
1017 if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
1018 return NVME_RDMA_CM_INVALID_RECFMT;
1019
1020 queue->host_qid = le16_to_cpu(req->qid);
1021
1022 /*
b825b44c 1023 * req->hsqsize corresponds to our recv queue size plus 1
8f000cac
CH		 1024 * req->hrqsize corresponds to our send queue size
1025 */
b825b44c 1026 queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
8f000cac
CH		 1027 queue->send_queue_size = le16_to_cpu(req->hrqsize);
1028
1029 if (!queue->host_qid && queue->recv_queue_size > NVMF_AQ_DEPTH)
1030 return NVME_RDMA_CM_INVALID_HSQSIZE;
1031
1032 /* XXX: Should we enforce some kind of max for IO queues? */
1033
1034 return 0;
1035}
1036
1037static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
1038 enum nvme_rdma_cm_status status)
1039{
1040 struct nvme_rdma_cm_rej rej;
1041
7a01a6ea
MG		 1042 pr_debug("rejecting connect request: status %d (%s)\n",
1043 status, nvme_rdma_cm_msg(status));
1044
8f000cac
CH		 1045 rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1046 rej.sts = cpu_to_le16(status);
1047
1048 return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
1049}
1050
1051static struct nvmet_rdma_queue *
1052nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
1053 struct rdma_cm_id *cm_id,
1054 struct rdma_cm_event *event)
1055{
1056 struct nvmet_rdma_queue *queue;
1057 int ret;
1058
1059 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1060 if (!queue) {
1061 ret = NVME_RDMA_CM_NO_RSC;
1062 goto out_reject;
1063 }
1064
1065 ret = nvmet_sq_init(&queue->nvme_sq);
70d4281c
BVA		 1066 if (ret) {
1067 ret = NVME_RDMA_CM_NO_RSC;
8f000cac 1068 goto out_free_queue;
70d4281c 1069 }
8f000cac
CH		 1070
1071 ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
1072 if (ret)
1073 goto out_destroy_sq;
1074
1075 /*
1076 * Schedules the actual release because calling rdma_destroy_id from
1077 * inside a CM callback would trigger a deadlock. (great API design..)
1078 */
1079 INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
1080 queue->dev = ndev;
1081 queue->cm_id = cm_id;
1082
1083 spin_lock_init(&queue->state_lock);
1084 queue->state = NVMET_RDMA_Q_CONNECTING;
1085 INIT_LIST_HEAD(&queue->rsp_wait_list);
1086 INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
1087 spin_lock_init(&queue->rsp_wr_wait_lock);
1088 INIT_LIST_HEAD(&queue->free_rsps);
1089 spin_lock_init(&queue->rsps_lock);
766dbb17 1090 INIT_LIST_HEAD(&queue->queue_list);
8f000cac
CH		 1091
1092 queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
1093 if (queue->idx < 0) {
1094 ret = NVME_RDMA_CM_NO_RSC;
6ccaeb56 1095 goto out_destroy_sq;
8f000cac
CH		 1096 }
1097
1098 ret = nvmet_rdma_alloc_rsps(queue);
1099 if (ret) {
1100 ret = NVME_RDMA_CM_NO_RSC;
1101 goto out_ida_remove;
1102 }
1103
1104 if (!ndev->srq) {
1105 queue->cmds = nvmet_rdma_alloc_cmds(ndev,
1106 queue->recv_queue_size,
1107 !queue->host_qid);
1108 if (IS_ERR(queue->cmds)) {
1109 ret = NVME_RDMA_CM_NO_RSC;
1110 goto out_free_responses;
1111 }
1112 }
1113
1114 ret = nvmet_rdma_create_queue_ib(queue);
1115 if (ret) {
1116 pr_err("%s: creating RDMA queue failed (%d).\n",
1117 __func__, ret);
1118 ret = NVME_RDMA_CM_NO_RSC;
1119 goto out_free_cmds;
1120 }
1121
1122 return queue;
1123
1124out_free_cmds:
1125 if (!ndev->srq) {
1126 nvmet_rdma_free_cmds(queue->dev, queue->cmds,
1127 queue->recv_queue_size,
1128 !queue->host_qid);
1129 }
1130out_free_responses:
1131 nvmet_rdma_free_rsps(queue);
1132out_ida_remove:
1133 ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
1134out_destroy_sq:
1135 nvmet_sq_destroy(&queue->nvme_sq);
1136out_free_queue:
1137 kfree(queue);
1138out_reject:
1139 nvmet_rdma_cm_reject(cm_id, ret);
1140 return NULL;
1141}
1142
1143static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
1144{
1145 struct nvmet_rdma_queue *queue = priv;
1146
1147 switch (event->event) {
1148 case IB_EVENT_COMM_EST:
1149 rdma_notify(queue->cm_id, event->event);
1150 break;
1151 default:
675796be
MG		 1152 pr_err("received IB QP event: %s (%d)\n",
1153 ib_event_msg(event->event), event->event);
8f000cac
CH		 1154 break;
1155 }
1156}
1157
1158static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
1159 struct nvmet_rdma_queue *queue,
1160 struct rdma_conn_param *p)
1161{
1162 struct rdma_conn_param param = { };
1163 struct nvme_rdma_cm_rep priv = { };
1164 int ret = -ENOMEM;
1165
1166 param.rnr_retry_count = 7;
1167 param.flow_control = 1;
1168 param.initiator_depth = min_t(u8, p->initiator_depth,
1169 queue->dev->device->attrs.max_qp_init_rd_atom);
1170 param.private_data = &priv;
1171 param.private_data_len = sizeof(priv);
1172 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1173 priv.crqsize = cpu_to_le16(queue->recv_queue_size);
1174
1175 ret = rdma_accept(cm_id, &param);
1176 if (ret)
1177 pr_err("rdma_accept failed (error code = %d)\n", ret);
1178
1179 return ret;
1180}
1181
1182static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
1183 struct rdma_cm_event *event)
1184{
1185 struct nvmet_rdma_device *ndev;
1186 struct nvmet_rdma_queue *queue;
1187 int ret = -EINVAL;
1188
1189 ndev = nvmet_rdma_find_get_device(cm_id);
1190 if (!ndev) {
8f000cac
CH		 1191 nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
1192 return -ECONNREFUSED;
1193 }
1194
1195 queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
1196 if (!queue) {
1197 ret = -ENOMEM;
1198 goto put_device;
1199 }
1200 queue->port = cm_id->context;
1201
1202 ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
1203 if (ret)
1204 goto release_queue;
1205
1206 mutex_lock(&nvmet_rdma_queue_mutex);
1207 list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
1208 mutex_unlock(&nvmet_rdma_queue_mutex);
1209
1210 return 0;
1211
1212release_queue:
1213 nvmet_rdma_free_queue(queue);
1214put_device:
1215 kref_put(&ndev->ref, nvmet_rdma_free_dev);
1216
1217 return ret;
1218}
1219
1220static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
1221{
1222 unsigned long flags;
1223
1224 spin_lock_irqsave(&queue->state_lock, flags);
1225 if (queue->state != NVMET_RDMA_Q_CONNECTING) {
1226 pr_warn("trying to establish a connected queue\n");
1227 goto out_unlock;
1228 }
1229 queue->state = NVMET_RDMA_Q_LIVE;
1230
1231 while (!list_empty(&queue->rsp_wait_list)) {
1232 struct nvmet_rdma_rsp *cmd;
1233
1234 cmd = list_first_entry(&queue->rsp_wait_list,
1235 struct nvmet_rdma_rsp, wait_list);
1236 list_del(&cmd->wait_list);
1237
1238 spin_unlock_irqrestore(&queue->state_lock, flags);
1239 nvmet_rdma_handle_command(queue, cmd);
1240 spin_lock_irqsave(&queue->state_lock, flags);
1241 }
1242
1243out_unlock:
1244 spin_unlock_irqrestore(&queue->state_lock, flags);
1245}
1246
1247static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1248{
1249 bool disconnect = false;
1250 unsigned long flags;
1251
1252 pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
1253
1254 spin_lock_irqsave(&queue->state_lock, flags);
1255 switch (queue->state) {
1256 case NVMET_RDMA_Q_CONNECTING:
1257 case NVMET_RDMA_Q_LIVE:
8f000cac 1258 queue->state = NVMET_RDMA_Q_DISCONNECTING;
d8f7750a
SG		 1259 case NVMET_RDMA_IN_DEVICE_REMOVAL:
1260 disconnect = true;
8f000cac
CH		 1261 break;
1262 case NVMET_RDMA_Q_DISCONNECTING:
1263 break;
1264 }
1265 spin_unlock_irqrestore(&queue->state_lock, flags);
1266
1267 if (disconnect) {
1268 rdma_disconnect(queue->cm_id);
8f000cac
CH		 1269 schedule_work(&queue->release_work);
1270 }
1271}
1272
1273static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
1274{
1275 bool disconnect = false;
1276
1277 mutex_lock(&nvmet_rdma_queue_mutex);
1278 if (!list_empty(&queue->queue_list)) {
1279 list_del_init(&queue->queue_list);
1280 disconnect = true;
1281 }
1282 mutex_unlock(&nvmet_rdma_queue_mutex);
1283
1284 if (disconnect)
1285 __nvmet_rdma_queue_disconnect(queue);
1286}
1287
1288static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
1289 struct nvmet_rdma_queue *queue)
1290{
1291 WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
1292
766dbb17
SG		 1293 mutex_lock(&nvmet_rdma_queue_mutex);
1294 if (!list_empty(&queue->queue_list))
1295 list_del_init(&queue->queue_list);
1296 mutex_unlock(&nvmet_rdma_queue_mutex);
1297
1298 pr_err("failed to connect queue %d\n", queue->idx);
8f000cac
CH		 1299 schedule_work(&queue->release_work);
1300}
1301
d8f7750a
SG		 1302/**
1303 * nvme_rdma_device_removal() - Handle RDMA device removal
1304 * @queue: nvmet rdma queue (cm id qp_context)
1305 * @addr: nvmet address (cm_id context)
1306 *
1307 * DEVICE_REMOVAL event notifies us that the RDMA device is about
1308 * to unplug so we should take care of destroying our RDMA resources.
1309 * This event will be generated for each allocated cm_id.
1310 *
1311 * Note that this event can be generated on a normal queue cm_id
1312 * and/or a device bound listener cm_id (where in this case
1313 * queue will be null).
1314 *
1315 * we claim ownership on destroying the cm_id. For queues we move
1316 * the queue state to NVMET_RDMA_IN_DEVICE_REMOVAL and for port
1317 * we nullify the priv to prevent double cm_id destruction and destroying
1318 * the cm_id implicitely by returning a non-zero rc to the callout.
1319 */
1320static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
1321 struct nvmet_rdma_queue *queue)
1322{
1323 unsigned long flags;
1324
1325 if (!queue) {
1326 struct nvmet_port *port = cm_id->context;
1327
1328 /*
1329 * This is a listener cm_id. Make sure that
1330 * future remove_port won't invoke a double
1331 * cm_id destroy. use atomic xchg to make sure
1332 * we don't compete with remove_port.
1333 */
1334 if (xchg(&port->priv, NULL) != cm_id)
1335 return 0;
1336 } else {
1337 /*
1338 * This is a queue cm_id. Make sure that
1339 * release queue will not destroy the cm_id
1340 * and schedule all ctrl queues removal (only
1341 * if the queue is not disconnecting already).
1342 */
1343 spin_lock_irqsave(&queue->state_lock, flags);
1344 if (queue->state != NVMET_RDMA_Q_DISCONNECTING)
1345 queue->state = NVMET_RDMA_IN_DEVICE_REMOVAL;
1346 spin_unlock_irqrestore(&queue->state_lock, flags);
1347 nvmet_rdma_queue_disconnect(queue);
1348 flush_scheduled_work();
1349 }
1350
1351 /*
1352 * We need to return 1 so that the core will destroy
1353 * it's own ID. What a great API design..
1354 */
1355 return 1;
1356}
1357
8f000cac
CH		 1358static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
1359 struct rdma_cm_event *event)
1360{
1361 struct nvmet_rdma_queue *queue = NULL;
1362 int ret = 0;
1363
1364 if (cm_id->qp)
1365 queue = cm_id->qp->qp_context;
1366
1367 pr_debug("%s (%d): status %d id %p\n",
1368 rdma_event_msg(event->event), event->event,
1369 event->status, cm_id);
1370
1371 switch (event->event) {
1372 case RDMA_CM_EVENT_CONNECT_REQUEST:
1373 ret = nvmet_rdma_queue_connect(cm_id, event);
1374 break;
1375 case RDMA_CM_EVENT_ESTABLISHED:
1376 nvmet_rdma_queue_established(queue);
1377 break;
1378 case RDMA_CM_EVENT_ADDR_CHANGE:
1379 case RDMA_CM_EVENT_DISCONNECTED:
8f000cac 1380 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
fa14a0ac
BVA		 1381 /*
1382 * We might end up here when we already freed the qp
1383 * which means queue release sequence is in progress,
1384 * so don't get in the way...
1385 */
1386 if (queue)
1387 nvmet_rdma_queue_disconnect(queue);
d8f7750a
SG		 1388 break;
1389 case RDMA_CM_EVENT_DEVICE_REMOVAL:
1390 ret = nvmet_rdma_device_removal(cm_id, queue);
8f000cac
CH		 1391 break;
1392 case RDMA_CM_EVENT_REJECTED:
512fb1b3
SW		 1393 pr_debug("Connection rejected: %s\n",
1394 rdma_reject_msg(cm_id, event->status));
1395 /* FALLTHROUGH */
8f000cac
CH		 1396 case RDMA_CM_EVENT_UNREACHABLE:
1397 case RDMA_CM_EVENT_CONNECT_ERROR:
1398 nvmet_rdma_queue_connect_fail(cm_id, queue);
1399 break;
1400 default:
1401 pr_err("received unrecognized RDMA CM event %d\n",
1402 event->event);
1403 break;
1404 }
1405
1406 return ret;
1407}
1408
1409static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
1410{
1411 struct nvmet_rdma_queue *queue;
1412
1413restart:
1414 mutex_lock(&nvmet_rdma_queue_mutex);
1415 list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
1416 if (queue->nvme_sq.ctrl == ctrl) {
1417 list_del_init(&queue->queue_list);
1418 mutex_unlock(&nvmet_rdma_queue_mutex);
1419
1420 __nvmet_rdma_queue_disconnect(queue);
1421 goto restart;
1422 }
1423 }
1424 mutex_unlock(&nvmet_rdma_queue_mutex);
1425}
1426
1427static int nvmet_rdma_add_port(struct nvmet_port *port)
1428{
1429 struct rdma_cm_id *cm_id;
1430 struct sockaddr_in addr_in;
1431 u16 port_in;
1432 int ret;
1433
1434 switch (port->disc_addr.adrfam) {
1435 case NVMF_ADDR_FAMILY_IP4:
1436 break;
1437 default:
1438 pr_err("address family %d not supported\n",
1439 port->disc_addr.adrfam);
1440 return -EINVAL;
1441 }
1442
1443 ret = kstrtou16(port->disc_addr.trsvcid, 0, &port_in);
1444 if (ret)
1445 return ret;
1446
1447 addr_in.sin_family = AF_INET;
1448 addr_in.sin_addr.s_addr = in_aton(port->disc_addr.traddr);
1449 addr_in.sin_port = htons(port_in);
1450
1451 cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
1452 RDMA_PS_TCP, IB_QPT_RC);
1453 if (IS_ERR(cm_id)) {
1454 pr_err("CM ID creation failed\n");
1455 return PTR_ERR(cm_id);
1456 }
1457
1458 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr_in);
1459 if (ret) {
1460 pr_err("binding CM ID to %pISpc failed (%d)\n", &addr_in, ret);
1461 goto out_destroy_id;
1462 }
1463
1464 ret = rdma_listen(cm_id, 128);
1465 if (ret) {
1466 pr_err("listening to %pISpc failed (%d)\n", &addr_in, ret);
1467 goto out_destroy_id;
1468 }
1469
1470 pr_info("enabling port %d (%pISpc)\n",
1471 le16_to_cpu(port->disc_addr.portid), &addr_in);
1472 port->priv = cm_id;
1473 return 0;
1474
1475out_destroy_id:
1476 rdma_destroy_id(cm_id);
1477 return ret;
1478}
1479
1480static void nvmet_rdma_remove_port(struct nvmet_port *port)
1481{
d8f7750a 1482 struct rdma_cm_id *cm_id = xchg(&port->priv, NULL);
8f000cac 1483
d8f7750a
SG		 1484 if (cm_id)
1485 rdma_destroy_id(cm_id);
8f000cac
CH		 1486}
1487
1488static struct nvmet_fabrics_ops nvmet_rdma_ops = {
1489 .owner = THIS_MODULE,
1490 .type = NVMF_TRTYPE_RDMA,
1491 .sqe_inline_size = NVMET_RDMA_INLINE_DATA_SIZE,
1492 .msdbd = 1,
1493 .has_keyed_sgls = 1,
1494 .add_port = nvmet_rdma_add_port,
1495 .remove_port = nvmet_rdma_remove_port,
1496 .queue_response = nvmet_rdma_queue_response,
1497 .delete_ctrl = nvmet_rdma_delete_ctrl,
1498};
1499
1500static int __init nvmet_rdma_init(void)
1501{
1502 return nvmet_register_transport(&nvmet_rdma_ops);
1503}
1504
1505static void __exit nvmet_rdma_exit(void)
1506{
1507 struct nvmet_rdma_queue *queue;
1508
1509 nvmet_unregister_transport(&nvmet_rdma_ops);
1510
1511 flush_scheduled_work();
1512
1513 mutex_lock(&nvmet_rdma_queue_mutex);
1514 while ((queue = list_first_entry_or_null(&nvmet_rdma_queue_list,
1515 struct nvmet_rdma_queue, queue_list))) {
1516 list_del_init(&queue->queue_list);
1517
1518 mutex_unlock(&nvmet_rdma_queue_mutex);
1519 __nvmet_rdma_queue_disconnect(queue);
1520 mutex_lock(&nvmet_rdma_queue_mutex);
1521 }
1522 mutex_unlock(&nvmet_rdma_queue_mutex);
1523
1524 flush_scheduled_work();
1525 ida_destroy(&nvmet_rdma_queue_ida);
1526}
1527
1528module_init(nvmet_rdma_init);
1529module_exit(nvmet_rdma_exit);
1530
1531MODULE_LICENSE("GPL v2");
1532MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */
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