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