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[linux-2.6-block.git] / drivers / nvme / target / tcp.c
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872d26a3
SG		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NVMe over Fabrics TCP target.
4 * Copyright (c) 2018 Lightbits Labs. All rights reserved.
5 */
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/err.h>
11#include <linux/nvme-tcp.h>
12#include <net/sock.h>
13#include <net/tcp.h>
14#include <linux/inet.h>
15#include <linux/llist.h>
16#include <crypto/hash.h>
17
18#include "nvmet.h"
19
20#define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
21
22#define NVMET_TCP_RECV_BUDGET 8
23#define NVMET_TCP_SEND_BUDGET 8
24#define NVMET_TCP_IO_WORK_BUDGET 64
25
26enum nvmet_tcp_send_state {
27 NVMET_TCP_SEND_DATA_PDU,
28 NVMET_TCP_SEND_DATA,
29 NVMET_TCP_SEND_R2T,
30 NVMET_TCP_SEND_DDGST,
31 NVMET_TCP_SEND_RESPONSE
32};
33
34enum nvmet_tcp_recv_state {
35 NVMET_TCP_RECV_PDU,
36 NVMET_TCP_RECV_DATA,
37 NVMET_TCP_RECV_DDGST,
38 NVMET_TCP_RECV_ERR,
39};
40
41enum {
42 NVMET_TCP_F_INIT_FAILED = (1 << 0),
43};
44
45struct nvmet_tcp_cmd {
46 struct nvmet_tcp_queue *queue;
47 struct nvmet_req req;
48
49 struct nvme_tcp_cmd_pdu *cmd_pdu;
50 struct nvme_tcp_rsp_pdu *rsp_pdu;
51 struct nvme_tcp_data_pdu *data_pdu;
52 struct nvme_tcp_r2t_pdu *r2t_pdu;
53
54 u32 rbytes_done;
55 u32 wbytes_done;
56
57 u32 pdu_len;
58 u32 pdu_recv;
59 int sg_idx;
60 int nr_mapped;
61 struct msghdr recv_msg;
62 struct kvec *iov;
63 u32 flags;
64
65 struct list_head entry;
66 struct llist_node lentry;
67
68 /* send state */
69 u32 offset;
70 struct scatterlist *cur_sg;
71 enum nvmet_tcp_send_state state;
72
73 __le32 exp_ddgst;
74 __le32 recv_ddgst;
75};
76
77enum nvmet_tcp_queue_state {
78 NVMET_TCP_Q_CONNECTING,
79 NVMET_TCP_Q_LIVE,
80 NVMET_TCP_Q_DISCONNECTING,
81};
82
83struct nvmet_tcp_queue {
84 struct socket *sock;
85 struct nvmet_tcp_port *port;
86 struct work_struct io_work;
87 int cpu;
88 struct nvmet_cq nvme_cq;
89 struct nvmet_sq nvme_sq;
90
91 /* send state */
92 struct nvmet_tcp_cmd *cmds;
93 unsigned int nr_cmds;
94 struct list_head free_list;
95 struct llist_head resp_list;
96 struct list_head resp_send_list;
97 int send_list_len;
98 struct nvmet_tcp_cmd *snd_cmd;
99
100 /* recv state */
101 int offset;
102 int left;
103 enum nvmet_tcp_recv_state rcv_state;
104 struct nvmet_tcp_cmd *cmd;
105 union nvme_tcp_pdu pdu;
106
107 /* digest state */
108 bool hdr_digest;
109 bool data_digest;
110 struct ahash_request *snd_hash;
111 struct ahash_request *rcv_hash;
112
113 spinlock_t state_lock;
114 enum nvmet_tcp_queue_state state;
115
116 struct sockaddr_storage sockaddr;
117 struct sockaddr_storage sockaddr_peer;
118 struct work_struct release_work;
119
120 int idx;
121 struct list_head queue_list;
122
123 struct nvmet_tcp_cmd connect;
124
125 struct page_frag_cache pf_cache;
126
127 void (*data_ready)(struct sock *);
128 void (*state_change)(struct sock *);
129 void (*write_space)(struct sock *);
130};
131
132struct nvmet_tcp_port {
133 struct socket *sock;
134 struct work_struct accept_work;
135 struct nvmet_port *nport;
136 struct sockaddr_storage addr;
137 int last_cpu;
138 void (*data_ready)(struct sock *);
139};
140
141static DEFINE_IDA(nvmet_tcp_queue_ida);
142static LIST_HEAD(nvmet_tcp_queue_list);
143static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
144
145static struct workqueue_struct *nvmet_tcp_wq;
146static struct nvmet_fabrics_ops nvmet_tcp_ops;
147static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
148static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
149
150static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
151 struct nvmet_tcp_cmd *cmd)
152{
153 return cmd - queue->cmds;
154}
155
156static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
157{
158 return nvme_is_write(cmd->req.cmd) &&
159 cmd->rbytes_done < cmd->req.transfer_len;
160}
161
162static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
163{
fc6c9730 164 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
872d26a3
SG		 165}
166
167static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
168{
169 return !nvme_is_write(cmd->req.cmd) &&
170 cmd->req.transfer_len > 0 &&
fc6c9730 171 !cmd->req.cqe->status;
872d26a3
SG		 172}
173
174static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
175{
176 return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
177 !cmd->rbytes_done;
178}
179
180static inline struct nvmet_tcp_cmd *
181nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
182{
183 struct nvmet_tcp_cmd *cmd;
184
185 cmd = list_first_entry_or_null(&queue->free_list,
186 struct nvmet_tcp_cmd, entry);
187 if (!cmd)
188 return NULL;
189 list_del_init(&cmd->entry);
190
191 cmd->rbytes_done = cmd->wbytes_done = 0;
192 cmd->pdu_len = 0;
193 cmd->pdu_recv = 0;
194 cmd->iov = NULL;
195 cmd->flags = 0;
196 return cmd;
197}
198
199static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
200{
201 if (unlikely(cmd == &cmd->queue->connect))
202 return;
203
204 list_add_tail(&cmd->entry, &cmd->queue->free_list);
205}
206
207static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
208{
209 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
210}
211
212static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
213{
214 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
215}
216
217static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
218 void *pdu, size_t len)
219{
220 struct scatterlist sg;
221
222 sg_init_one(&sg, pdu, len);
223 ahash_request_set_crypt(hash, &sg, pdu + len, len);
224 crypto_ahash_digest(hash);
225}
226
227static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
228 void *pdu, size_t len)
229{
230 struct nvme_tcp_hdr *hdr = pdu;
231 __le32 recv_digest;
232 __le32 exp_digest;
233
234 if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
235 pr_err("queue %d: header digest enabled but no header digest\n",
236 queue->idx);
237 return -EPROTO;
238 }
239
240 recv_digest = *(__le32 *)(pdu + hdr->hlen);
241 nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
242 exp_digest = *(__le32 *)(pdu + hdr->hlen);
243 if (recv_digest != exp_digest) {
244 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
245 queue->idx, le32_to_cpu(recv_digest),
246 le32_to_cpu(exp_digest));
247 return -EPROTO;
248 }
249
250 return 0;
251}
252
253static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
254{
255 struct nvme_tcp_hdr *hdr = pdu;
256 u8 digest_len = nvmet_tcp_hdgst_len(queue);
257 u32 len;
258
259 len = le32_to_cpu(hdr->plen) - hdr->hlen -
260 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
261
262 if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
263 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
264 return -EPROTO;
265 }
266
267 return 0;
268}
269
270static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
271{
272 struct scatterlist *sg;
273 int i;
274
275 sg = &cmd->req.sg[cmd->sg_idx];
276
277 for (i = 0; i < cmd->nr_mapped; i++)
278 kunmap(sg_page(&sg[i]));
279}
280
281static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
282{
283 struct kvec *iov = cmd->iov;
284 struct scatterlist *sg;
285 u32 length, offset, sg_offset;
286
287 length = cmd->pdu_len;
288 cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
289 offset = cmd->rbytes_done;
290 cmd->sg_idx = DIV_ROUND_UP(offset, PAGE_SIZE);
291 sg_offset = offset % PAGE_SIZE;
292 sg = &cmd->req.sg[cmd->sg_idx];
293
294 while (length) {
295 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
296
297 iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
298 iov->iov_len = iov_len;
299
300 length -= iov_len;
301 sg = sg_next(sg);
302 iov++;
303 }
304
305 iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
306 cmd->nr_mapped, cmd->pdu_len);
307}
308
309static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
310{
311 queue->rcv_state = NVMET_TCP_RECV_ERR;
312 if (queue->nvme_sq.ctrl)
313 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
314 else
315 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
316}
317
318static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
319{
320 struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
321 u32 len = le32_to_cpu(sgl->length);
322
323 if (!cmd->req.data_len)
324 return 0;
325
326 if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
327 NVME_SGL_FMT_OFFSET)) {
328 if (!nvme_is_write(cmd->req.cmd))
329 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
330
331 if (len > cmd->req.port->inline_data_size)
332 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
333 cmd->pdu_len = len;
334 }
335 cmd->req.transfer_len += len;
336
337 cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
338 if (!cmd->req.sg)
339 return NVME_SC_INTERNAL;
340 cmd->cur_sg = cmd->req.sg;
341
342 if (nvmet_tcp_has_data_in(cmd)) {
343 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
344 sizeof(*cmd->iov), GFP_KERNEL);
345 if (!cmd->iov)
346 goto err;
347 }
348
349 return 0;
350err:
351 sgl_free(cmd->req.sg);
352 return NVME_SC_INTERNAL;
353}
354
355static void nvmet_tcp_ddgst(struct ahash_request *hash,
356 struct nvmet_tcp_cmd *cmd)
357{
358 ahash_request_set_crypt(hash, cmd->req.sg,
359 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
360 crypto_ahash_digest(hash);
361}
362
363static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
364{
365 struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
366 struct nvmet_tcp_queue *queue = cmd->queue;
367 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
368 u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
369
370 cmd->offset = 0;
371 cmd->state = NVMET_TCP_SEND_DATA_PDU;
372
373 pdu->hdr.type = nvme_tcp_c2h_data;
70583295
SG		 374 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
375 NVME_TCP_F_DATA_SUCCESS : 0);
872d26a3
SG		 376 pdu->hdr.hlen = sizeof(*pdu);
377 pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
378 pdu->hdr.plen =
379 cpu_to_le32(pdu->hdr.hlen + hdgst +
380 cmd->req.transfer_len + ddgst);
fc6c9730 381 pdu->command_id = cmd->req.cqe->command_id;
872d26a3
SG		 382 pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
383 pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
384
385 if (queue->data_digest) {
386 pdu->hdr.flags |= NVME_TCP_F_DDGST;
387 nvmet_tcp_ddgst(queue->snd_hash, cmd);
388 }
389
390 if (cmd->queue->hdr_digest) {
391 pdu->hdr.flags |= NVME_TCP_F_HDGST;
392 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
393 }
394}
395
396static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
397{
398 struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
399 struct nvmet_tcp_queue *queue = cmd->queue;
400 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
401
402 cmd->offset = 0;
403 cmd->state = NVMET_TCP_SEND_R2T;
404
405 pdu->hdr.type = nvme_tcp_r2t;
406 pdu->hdr.flags = 0;
407 pdu->hdr.hlen = sizeof(*pdu);
408 pdu->hdr.pdo = 0;
409 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
410
411 pdu->command_id = cmd->req.cmd->common.command_id;
412 pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
413 pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
414 pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
415 if (cmd->queue->hdr_digest) {
416 pdu->hdr.flags |= NVME_TCP_F_HDGST;
417 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
418 }
419}
420
421static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
422{
423 struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
424 struct nvmet_tcp_queue *queue = cmd->queue;
425 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
426
427 cmd->offset = 0;
428 cmd->state = NVMET_TCP_SEND_RESPONSE;
429
430 pdu->hdr.type = nvme_tcp_rsp;
431 pdu->hdr.flags = 0;
432 pdu->hdr.hlen = sizeof(*pdu);
433 pdu->hdr.pdo = 0;
434 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
435 if (cmd->queue->hdr_digest) {
436 pdu->hdr.flags |= NVME_TCP_F_HDGST;
437 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
438 }
439}
440
441static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
442{
443 struct llist_node *node;
444
445 node = llist_del_all(&queue->resp_list);
446 if (!node)
447 return;
448
449 while (node) {
450 struct nvmet_tcp_cmd *cmd = llist_entry(node,
451 struct nvmet_tcp_cmd, lentry);
452
453 list_add(&cmd->entry, &queue->resp_send_list);
454 node = node->next;
455 queue->send_list_len++;
456 }
457}
458
459static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
460{
461 queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
462 struct nvmet_tcp_cmd, entry);
463 if (!queue->snd_cmd) {
464 nvmet_tcp_process_resp_list(queue);
465 queue->snd_cmd =
466 list_first_entry_or_null(&queue->resp_send_list,
467 struct nvmet_tcp_cmd, entry);
468 if (unlikely(!queue->snd_cmd))
469 return NULL;
470 }
471
472 list_del_init(&queue->snd_cmd->entry);
473 queue->send_list_len--;
474
475 if (nvmet_tcp_need_data_out(queue->snd_cmd))
476 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
477 else if (nvmet_tcp_need_data_in(queue->snd_cmd))
478 nvmet_setup_r2t_pdu(queue->snd_cmd);
479 else
480 nvmet_setup_response_pdu(queue->snd_cmd);
481
482 return queue->snd_cmd;
483}
484
485static void nvmet_tcp_queue_response(struct nvmet_req *req)
486{
487 struct nvmet_tcp_cmd *cmd =
488 container_of(req, struct nvmet_tcp_cmd, req);
489 struct nvmet_tcp_queue *queue = cmd->queue;
490
491 llist_add(&cmd->lentry, &queue->resp_list);
492 queue_work_on(cmd->queue->cpu, nvmet_tcp_wq, &cmd->queue->io_work);
493}
494
495static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
496{
497 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
498 int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
499 int ret;
500
501 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
502 offset_in_page(cmd->data_pdu) + cmd->offset,
503 left, MSG_DONTWAIT | MSG_MORE);
504 if (ret <= 0)
505 return ret;
506
507 cmd->offset += ret;
508 left -= ret;
509
510 if (left)
511 return -EAGAIN;
512
513 cmd->state = NVMET_TCP_SEND_DATA;
514 cmd->offset = 0;
515 return 1;
516}
517
518static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd)
519{
520 struct nvmet_tcp_queue *queue = cmd->queue;
521 int ret;
522
523 while (cmd->cur_sg) {
524 struct page *page = sg_page(cmd->cur_sg);
525 u32 left = cmd->cur_sg->length - cmd->offset;
526
527 ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
528 left, MSG_DONTWAIT | MSG_MORE);
529 if (ret <= 0)
530 return ret;
531
532 cmd->offset += ret;
533 cmd->wbytes_done += ret;
534
535 /* Done with sg?*/
536 if (cmd->offset == cmd->cur_sg->length) {
537 cmd->cur_sg = sg_next(cmd->cur_sg);
538 cmd->offset = 0;
539 }
540 }
541
542 if (queue->data_digest) {
543 cmd->state = NVMET_TCP_SEND_DDGST;
544 cmd->offset = 0;
545 } else {
70583295
SG		 546 if (queue->nvme_sq.sqhd_disabled) {
547 cmd->queue->snd_cmd = NULL;
548 nvmet_tcp_put_cmd(cmd);
549 } else {
550 nvmet_setup_response_pdu(cmd);
551 }
872d26a3 552 }
70583295
SG		 553
554 if (queue->nvme_sq.sqhd_disabled) {
555 kfree(cmd->iov);
556 sgl_free(cmd->req.sg);
557 }
558
872d26a3
SG		 559 return 1;
560
561}
562
563static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
564 bool last_in_batch)
565{
566 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
567 int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
568 int flags = MSG_DONTWAIT;
569 int ret;
570
571 if (!last_in_batch && cmd->queue->send_list_len)
572 flags |= MSG_MORE;
573 else
574 flags |= MSG_EOR;
575
576 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu),
577 offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags);
578 if (ret <= 0)
579 return ret;
580 cmd->offset += ret;
581 left -= ret;
582
583 if (left)
584 return -EAGAIN;
585
586 kfree(cmd->iov);
587 sgl_free(cmd->req.sg);
588 cmd->queue->snd_cmd = NULL;
589 nvmet_tcp_put_cmd(cmd);
590 return 1;
591}
592
593static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
594{
595 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
596 int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
597 int flags = MSG_DONTWAIT;
598 int ret;
599
600 if (!last_in_batch && cmd->queue->send_list_len)
601 flags |= MSG_MORE;
602 else
603 flags |= MSG_EOR;
604
605 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu),
606 offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags);
607 if (ret <= 0)
608 return ret;
609 cmd->offset += ret;
610 left -= ret;
611
612 if (left)
613 return -EAGAIN;
614
615 cmd->queue->snd_cmd = NULL;
616 return 1;
617}
618
619static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd)
620{
621 struct nvmet_tcp_queue *queue = cmd->queue;
622 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
623 struct kvec iov = {
624 .iov_base = &cmd->exp_ddgst + cmd->offset,
625 .iov_len = NVME_TCP_DIGEST_LENGTH - cmd->offset
626 };
627 int ret;
628
629 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
630 if (unlikely(ret <= 0))
631 return ret;
632
633 cmd->offset += ret;
70583295
SG		 634
635 if (queue->nvme_sq.sqhd_disabled) {
636 cmd->queue->snd_cmd = NULL;
637 nvmet_tcp_put_cmd(cmd);
638 } else {
639 nvmet_setup_response_pdu(cmd);
640 }
872d26a3
SG		 641 return 1;
642}
643
644static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
645 bool last_in_batch)
646{
647 struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
648 int ret = 0;
649
650 if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
651 cmd = nvmet_tcp_fetch_cmd(queue);
652 if (unlikely(!cmd))
653 return 0;
654 }
655
656 if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
657 ret = nvmet_try_send_data_pdu(cmd);
658 if (ret <= 0)
659 goto done_send;
660 }
661
662 if (cmd->state == NVMET_TCP_SEND_DATA) {
663 ret = nvmet_try_send_data(cmd);
664 if (ret <= 0)
665 goto done_send;
666 }
667
668 if (cmd->state == NVMET_TCP_SEND_DDGST) {
669 ret = nvmet_try_send_ddgst(cmd);
670 if (ret <= 0)
671 goto done_send;
672 }
673
674 if (cmd->state == NVMET_TCP_SEND_R2T) {
675 ret = nvmet_try_send_r2t(cmd, last_in_batch);
676 if (ret <= 0)
677 goto done_send;
678 }
679
680 if (cmd->state == NVMET_TCP_SEND_RESPONSE)
681 ret = nvmet_try_send_response(cmd, last_in_batch);
682
683done_send:
684 if (ret < 0) {
685 if (ret == -EAGAIN)
686 return 0;
687 return ret;
688 }
689
690 return 1;
691}
692
693static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
694 int budget, int *sends)
695{
696 int i, ret = 0;
697
698 for (i = 0; i < budget; i++) {
699 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
700 if (ret <= 0)
701 break;
702 (*sends)++;
703 }
704
705 return ret;
706}
707
708static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
709{
710 queue->offset = 0;
711 queue->left = sizeof(struct nvme_tcp_hdr);
712 queue->cmd = NULL;
713 queue->rcv_state = NVMET_TCP_RECV_PDU;
714}
715
716static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
717{
718 struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
719
720 ahash_request_free(queue->rcv_hash);
721 ahash_request_free(queue->snd_hash);
722 crypto_free_ahash(tfm);
723}
724
725static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
726{
727 struct crypto_ahash *tfm;
728
729 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
730 if (IS_ERR(tfm))
731 return PTR_ERR(tfm);
732
733 queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
734 if (!queue->snd_hash)
735 goto free_tfm;
736 ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
737
738 queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
739 if (!queue->rcv_hash)
740 goto free_snd_hash;
741 ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
742
743 return 0;
744free_snd_hash:
745 ahash_request_free(queue->snd_hash);
746free_tfm:
747 crypto_free_ahash(tfm);
748 return -ENOMEM;
749}
750
751
752static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
753{
754 struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
755 struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
756 struct msghdr msg = {};
757 struct kvec iov;
758 int ret;
759
760 if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
761 pr_err("bad nvme-tcp pdu length (%d)\n",
762 le32_to_cpu(icreq->hdr.plen));
763 nvmet_tcp_fatal_error(queue);
764 }
765
766 if (icreq->pfv != NVME_TCP_PFV_1_0) {
767 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
768 return -EPROTO;
769 }
770
771 if (icreq->hpda != 0) {
772 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
773 icreq->hpda);
774 return -EPROTO;
775 }
776
872d26a3
SG		 777 queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
778 queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
779 if (queue->hdr_digest || queue->data_digest) {
780 ret = nvmet_tcp_alloc_crypto(queue);
781 if (ret)
782 return ret;
783 }
784
785 memset(icresp, 0, sizeof(*icresp));
786 icresp->hdr.type = nvme_tcp_icresp;
787 icresp->hdr.hlen = sizeof(*icresp);
788 icresp->hdr.pdo = 0;
789 icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
790 icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
f4d10b5c 791 icresp->maxdata = cpu_to_le32(0xffff); /* FIXME: support r2t */
872d26a3
SG		 792 icresp->cpda = 0;
793 if (queue->hdr_digest)
794 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
795 if (queue->data_digest)
796 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
797
798 iov.iov_base = icresp;
799 iov.iov_len = sizeof(*icresp);
800 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
801 if (ret < 0)
802 goto free_crypto;
803
804 queue->state = NVMET_TCP_Q_LIVE;
805 nvmet_prepare_receive_pdu(queue);
806 return 0;
807free_crypto:
808 if (queue->hdr_digest || queue->data_digest)
809 nvmet_tcp_free_crypto(queue);
810 return ret;
811}
812
813static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
814 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
815{
816 int ret;
817
818 /* recover the expected data transfer length */
819 req->data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
820
821 if (!nvme_is_write(cmd->req.cmd) ||
822 req->data_len > cmd->req.port->inline_data_size) {
823 nvmet_prepare_receive_pdu(queue);
824 return;
825 }
826
827 ret = nvmet_tcp_map_data(cmd);
828 if (unlikely(ret)) {
829 pr_err("queue %d: failed to map data\n", queue->idx);
830 nvmet_tcp_fatal_error(queue);
831 return;
832 }
833
834 queue->rcv_state = NVMET_TCP_RECV_DATA;
835 nvmet_tcp_map_pdu_iovec(cmd);
836 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
837}
838
839static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
840{
841 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
842 struct nvmet_tcp_cmd *cmd;
843
844 cmd = &queue->cmds[data->ttag];
845
846 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
847 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
848 data->ttag, le32_to_cpu(data->data_offset),
849 cmd->rbytes_done);
850 /* FIXME: use path and transport errors */
851 nvmet_req_complete(&cmd->req,
852 NVME_SC_INVALID_FIELD | NVME_SC_DNR);
853 return -EPROTO;
854 }
855
856 cmd->pdu_len = le32_to_cpu(data->data_length);
857 cmd->pdu_recv = 0;
858 nvmet_tcp_map_pdu_iovec(cmd);
859 queue->cmd = cmd;
860 queue->rcv_state = NVMET_TCP_RECV_DATA;
861
862 return 0;
863}
864
865static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
866{
867 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
868 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
869 struct nvmet_req *req;
870 int ret;
871
872 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
873 if (hdr->type != nvme_tcp_icreq) {
874 pr_err("unexpected pdu type (%d) before icreq\n",
875 hdr->type);
876 nvmet_tcp_fatal_error(queue);
877 return -EPROTO;
878 }
879 return nvmet_tcp_handle_icreq(queue);
880 }
881
882 if (hdr->type == nvme_tcp_h2c_data) {
883 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
884 if (unlikely(ret))
885 return ret;
886 return 0;
887 }
888
889 queue->cmd = nvmet_tcp_get_cmd(queue);
890 if (unlikely(!queue->cmd)) {
891 /* This should never happen */
892 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
893 queue->idx, queue->nr_cmds, queue->send_list_len,
894 nvme_cmd->common.opcode);
895 nvmet_tcp_fatal_error(queue);
896 return -ENOMEM;
897 }
898
899 req = &queue->cmd->req;
900 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
901
902 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
903 &queue->nvme_sq, &nvmet_tcp_ops))) {
904 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
905 req->cmd, req->cmd->common.command_id,
906 req->cmd->common.opcode,
907 le32_to_cpu(req->cmd->common.dptr.sgl.length));
908
909 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
910 return -EAGAIN;
911 }
912
913 ret = nvmet_tcp_map_data(queue->cmd);
914 if (unlikely(ret)) {
915 pr_err("queue %d: failed to map data\n", queue->idx);
916 if (nvmet_tcp_has_inline_data(queue->cmd))
917 nvmet_tcp_fatal_error(queue);
918 else
919 nvmet_req_complete(req, ret);
920 ret = -EAGAIN;
921 goto out;
922 }
923
924 if (nvmet_tcp_need_data_in(queue->cmd)) {
925 if (nvmet_tcp_has_inline_data(queue->cmd)) {
926 queue->rcv_state = NVMET_TCP_RECV_DATA;
927 nvmet_tcp_map_pdu_iovec(queue->cmd);
928 return 0;
929 }
930 /* send back R2T */
931 nvmet_tcp_queue_response(&queue->cmd->req);
932 goto out;
933 }
934
935 nvmet_req_execute(&queue->cmd->req);
936out:
937 nvmet_prepare_receive_pdu(queue);
938 return ret;
939}
940
941static const u8 nvme_tcp_pdu_sizes[] = {
942 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
943 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
944 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
945};
946
947static inline u8 nvmet_tcp_pdu_size(u8 type)
948{
949 size_t idx = type;
950
951 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
952 nvme_tcp_pdu_sizes[idx]) ?
953 nvme_tcp_pdu_sizes[idx] : 0;
954}
955
956static inline bool nvmet_tcp_pdu_valid(u8 type)
957{
958 switch (type) {
959 case nvme_tcp_icreq:
960 case nvme_tcp_cmd:
961 case nvme_tcp_h2c_data:
962 /* fallthru */
963 return true;
964 }
965
966 return false;
967}
968
969static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
970{
971 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
972 int len;
973 struct kvec iov;
974 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
975
976recv:
977 iov.iov_base = (void *)&queue->pdu + queue->offset;
978 iov.iov_len = queue->left;
979 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
980 iov.iov_len, msg.msg_flags);
981 if (unlikely(len < 0))
982 return len;
983
984 queue->offset += len;
985 queue->left -= len;
986 if (queue->left)
987 return -EAGAIN;
988
989 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
990 u8 hdgst = nvmet_tcp_hdgst_len(queue);
991
992 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
993 pr_err("unexpected pdu type %d\n", hdr->type);
994 nvmet_tcp_fatal_error(queue);
995 return -EIO;
996 }
997
998 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
999 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1000 return -EIO;
1001 }
1002
1003 queue->left = hdr->hlen - queue->offset + hdgst;
1004 goto recv;
1005 }
1006
1007 if (queue->hdr_digest &&
1008 nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) {
1009 nvmet_tcp_fatal_error(queue); /* fatal */
1010 return -EPROTO;
1011 }
1012
1013 if (queue->data_digest &&
1014 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1015 nvmet_tcp_fatal_error(queue); /* fatal */
1016 return -EPROTO;
1017 }
1018
1019 return nvmet_tcp_done_recv_pdu(queue);
1020}
1021
1022static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1023{
1024 struct nvmet_tcp_queue *queue = cmd->queue;
1025
1026 nvmet_tcp_ddgst(queue->rcv_hash, cmd);
1027 queue->offset = 0;
1028 queue->left = NVME_TCP_DIGEST_LENGTH;
1029 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1030}
1031
1032static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1033{
1034 struct nvmet_tcp_cmd *cmd = queue->cmd;
1035 int ret;
1036
1037 while (msg_data_left(&cmd->recv_msg)) {
1038 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1039 cmd->recv_msg.msg_flags);
1040 if (ret <= 0)
1041 return ret;
1042
1043 cmd->pdu_recv += ret;
1044 cmd->rbytes_done += ret;
1045 }
1046
1047 nvmet_tcp_unmap_pdu_iovec(cmd);
1048
1049 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1050 cmd->rbytes_done == cmd->req.transfer_len) {
1051 if (queue->data_digest) {
1052 nvmet_tcp_prep_recv_ddgst(cmd);
1053 return 0;
1054 }
1055 nvmet_req_execute(&cmd->req);
1056 }
1057
1058 nvmet_prepare_receive_pdu(queue);
1059 return 0;
1060}
1061
1062static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1063{
1064 struct nvmet_tcp_cmd *cmd = queue->cmd;
1065 int ret;
1066 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1067 struct kvec iov = {
1068 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1069 .iov_len = queue->left
1070 };
1071
1072 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1073 iov.iov_len, msg.msg_flags);
1074 if (unlikely(ret < 0))
1075 return ret;
1076
1077 queue->offset += ret;
1078 queue->left -= ret;
1079 if (queue->left)
1080 return -EAGAIN;
1081
1082 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1083 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1084 queue->idx, cmd->req.cmd->common.command_id,
1085 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1086 le32_to_cpu(cmd->exp_ddgst));
1087 nvmet_tcp_finish_cmd(cmd);
1088 nvmet_tcp_fatal_error(queue);
1089 ret = -EPROTO;
1090 goto out;
1091 }
1092
1093 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1094 cmd->rbytes_done == cmd->req.transfer_len)
1095 nvmet_req_execute(&cmd->req);
1096 ret = 0;
1097out:
1098 nvmet_prepare_receive_pdu(queue);
1099 return ret;
1100}
1101
1102static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1103{
fb865858 1104 int result = 0;
872d26a3
SG		 1105
1106 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1107 return 0;
1108
1109 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1110 result = nvmet_tcp_try_recv_pdu(queue);
1111 if (result != 0)
1112 goto done_recv;
1113 }
1114
1115 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1116 result = nvmet_tcp_try_recv_data(queue);
1117 if (result != 0)
1118 goto done_recv;
1119 }
1120
1121 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1122 result = nvmet_tcp_try_recv_ddgst(queue);
1123 if (result != 0)
1124 goto done_recv;
1125 }
1126
1127done_recv:
1128 if (result < 0) {
1129 if (result == -EAGAIN)
1130 return 0;
1131 return result;
1132 }
1133 return 1;
1134}
1135
1136static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1137 int budget, int *recvs)
1138{
1139 int i, ret = 0;
1140
1141 for (i = 0; i < budget; i++) {
1142 ret = nvmet_tcp_try_recv_one(queue);
1143 if (ret <= 0)
1144 break;
1145 (*recvs)++;
1146 }
1147
1148 return ret;
1149}
1150
1151static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1152{
1153 spin_lock(&queue->state_lock);
1154 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1155 queue->state = NVMET_TCP_Q_DISCONNECTING;
1156 schedule_work(&queue->release_work);
1157 }
1158 spin_unlock(&queue->state_lock);
1159}
1160
1161static void nvmet_tcp_io_work(struct work_struct *w)
1162{
1163 struct nvmet_tcp_queue *queue =
1164 container_of(w, struct nvmet_tcp_queue, io_work);
1165 bool pending;
1166 int ret, ops = 0;
1167
1168 do {
1169 pending = false;
1170
1171 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1172 if (ret > 0) {
1173 pending = true;
1174 } else if (ret < 0) {
1175 if (ret == -EPIPE || ret == -ECONNRESET)
1176 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1177 else
1178 nvmet_tcp_fatal_error(queue);
1179 return;
1180 }
1181
1182 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1183 if (ret > 0) {
1184 /* transmitted message/data */
1185 pending = true;
1186 } else if (ret < 0) {
1187 if (ret == -EPIPE || ret == -ECONNRESET)
1188 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1189 else
1190 nvmet_tcp_fatal_error(queue);
1191 return;
1192 }
1193
1194 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1195
1196 /*
1197 * We exahusted our budget, requeue our selves
1198 */
1199 if (pending)
1200 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1201}
1202
1203static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1204 struct nvmet_tcp_cmd *c)
1205{
1206 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1207
1208 c->queue = queue;
1209 c->req.port = queue->port->nport;
1210
1211 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1212 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1213 if (!c->cmd_pdu)
1214 return -ENOMEM;
1215 c->req.cmd = &c->cmd_pdu->cmd;
1216
1217 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1218 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1219 if (!c->rsp_pdu)
1220 goto out_free_cmd;
fc6c9730 1221 c->req.cqe = &c->rsp_pdu->cqe;
872d26a3
SG		 1222
1223 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1224 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1225 if (!c->data_pdu)
1226 goto out_free_rsp;
1227
1228 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1229 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1230 if (!c->r2t_pdu)
1231 goto out_free_data;
1232
1233 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1234
1235 list_add_tail(&c->entry, &queue->free_list);
1236
1237 return 0;
1238out_free_data:
1239 page_frag_free(c->data_pdu);
1240out_free_rsp:
1241 page_frag_free(c->rsp_pdu);
1242out_free_cmd:
1243 page_frag_free(c->cmd_pdu);
1244 return -ENOMEM;
1245}
1246
1247static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1248{
1249 page_frag_free(c->r2t_pdu);
1250 page_frag_free(c->data_pdu);
1251 page_frag_free(c->rsp_pdu);
1252 page_frag_free(c->cmd_pdu);
1253}
1254
1255static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1256{
1257 struct nvmet_tcp_cmd *cmds;
1258 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1259
1260 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1261 if (!cmds)
1262 goto out;
1263
1264 for (i = 0; i < nr_cmds; i++) {
1265 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1266 if (ret)
1267 goto out_free;
1268 }
1269
1270 queue->cmds = cmds;
1271
1272 return 0;
1273out_free:
1274 while (--i >= 0)
1275 nvmet_tcp_free_cmd(cmds + i);
1276 kfree(cmds);
1277out:
1278 return ret;
1279}
1280
1281static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1282{
1283 struct nvmet_tcp_cmd *cmds = queue->cmds;
1284 int i;
1285
1286 for (i = 0; i < queue->nr_cmds; i++)
1287 nvmet_tcp_free_cmd(cmds + i);
1288
1289 nvmet_tcp_free_cmd(&queue->connect);
1290 kfree(cmds);
1291}
1292
1293static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1294{
1295 struct socket *sock = queue->sock;
1296
1297 write_lock_bh(&sock->sk->sk_callback_lock);
1298 sock->sk->sk_data_ready = queue->data_ready;
1299 sock->sk->sk_state_change = queue->state_change;
1300 sock->sk->sk_write_space = queue->write_space;
1301 sock->sk->sk_user_data = NULL;
1302 write_unlock_bh(&sock->sk->sk_callback_lock);
1303}
1304
1305static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1306{
1307 nvmet_req_uninit(&cmd->req);
1308 nvmet_tcp_unmap_pdu_iovec(cmd);
1309 sgl_free(cmd->req.sg);
1310}
1311
1312static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1313{
1314 struct nvmet_tcp_cmd *cmd = queue->cmds;
1315 int i;
1316
1317 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1318 if (nvmet_tcp_need_data_in(cmd))
1319 nvmet_tcp_finish_cmd(cmd);
1320 }
1321
1322 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1323 /* failed in connect */
1324 nvmet_tcp_finish_cmd(&queue->connect);
1325 }
1326}
1327
1328static void nvmet_tcp_release_queue_work(struct work_struct *w)
1329{
1330 struct nvmet_tcp_queue *queue =
1331 container_of(w, struct nvmet_tcp_queue, release_work);
1332
1333 mutex_lock(&nvmet_tcp_queue_mutex);
1334 list_del_init(&queue->queue_list);
1335 mutex_unlock(&nvmet_tcp_queue_mutex);
1336
1337 nvmet_tcp_restore_socket_callbacks(queue);
1338 flush_work(&queue->io_work);
1339
1340 nvmet_tcp_uninit_data_in_cmds(queue);
1341 nvmet_sq_destroy(&queue->nvme_sq);
1342 cancel_work_sync(&queue->io_work);
1343 sock_release(queue->sock);
1344 nvmet_tcp_free_cmds(queue);
1345 if (queue->hdr_digest || queue->data_digest)
1346 nvmet_tcp_free_crypto(queue);
1347 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1348
1349 kfree(queue);
1350}
1351
1352static void nvmet_tcp_data_ready(struct sock *sk)
1353{
1354 struct nvmet_tcp_queue *queue;
1355
1356 read_lock_bh(&sk->sk_callback_lock);
1357 queue = sk->sk_user_data;
1358 if (likely(queue))
1359 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1360 read_unlock_bh(&sk->sk_callback_lock);
1361}
1362
1363static void nvmet_tcp_write_space(struct sock *sk)
1364{
1365 struct nvmet_tcp_queue *queue;
1366
1367 read_lock_bh(&sk->sk_callback_lock);
1368 queue = sk->sk_user_data;
1369 if (unlikely(!queue))
1370 goto out;
1371
1372 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1373 queue->write_space(sk);
1374 goto out;
1375 }
1376
1377 if (sk_stream_is_writeable(sk)) {
1378 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1379 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1380 }
1381out:
1382 read_unlock_bh(&sk->sk_callback_lock);
1383}
1384
1385static void nvmet_tcp_state_change(struct sock *sk)
1386{
1387 struct nvmet_tcp_queue *queue;
1388
1389 write_lock_bh(&sk->sk_callback_lock);
1390 queue = sk->sk_user_data;
1391 if (!queue)
1392 goto done;
1393
1394 switch (sk->sk_state) {
1395 case TCP_FIN_WAIT1:
1396 case TCP_CLOSE_WAIT:
1397 case TCP_CLOSE:
1398 /* FALLTHRU */
1399 sk->sk_user_data = NULL;
1400 nvmet_tcp_schedule_release_queue(queue);
1401 break;
1402 default:
1403 pr_warn("queue %d unhandled state %d\n",
1404 queue->idx, sk->sk_state);
1405 }
1406done:
1407 write_unlock_bh(&sk->sk_callback_lock);
1408}
1409
1410static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1411{
1412 struct socket *sock = queue->sock;
1413 struct linger sol = { .l_onoff = 1, .l_linger = 0 };
1414 int ret;
1415
1416 ret = kernel_getsockname(sock,
1417 (struct sockaddr *)&queue->sockaddr);
1418 if (ret < 0)
1419 return ret;
1420
1421 ret = kernel_getpeername(sock,
1422 (struct sockaddr *)&queue->sockaddr_peer);
1423 if (ret < 0)
1424 return ret;
1425
1426 /*
1427 * Cleanup whatever is sitting in the TCP transmit queue on socket
1428 * close. This is done to prevent stale data from being sent should
1429 * the network connection be restored before TCP times out.
1430 */
1431 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
1432 (char *)&sol, sizeof(sol));
1433 if (ret)
1434 return ret;
1435
1436 write_lock_bh(&sock->sk->sk_callback_lock);
1437 sock->sk->sk_user_data = queue;
1438 queue->data_ready = sock->sk->sk_data_ready;
1439 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1440 queue->state_change = sock->sk->sk_state_change;
1441 sock->sk->sk_state_change = nvmet_tcp_state_change;
1442 queue->write_space = sock->sk->sk_write_space;
1443 sock->sk->sk_write_space = nvmet_tcp_write_space;
1444 write_unlock_bh(&sock->sk->sk_callback_lock);
1445
1446 return 0;
1447}
1448
1449static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1450 struct socket *newsock)
1451{
1452 struct nvmet_tcp_queue *queue;
1453 int ret;
1454
1455 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1456 if (!queue)
1457 return -ENOMEM;
1458
1459 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1460 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1461 queue->sock = newsock;
1462 queue->port = port;
1463 queue->nr_cmds = 0;
1464 spin_lock_init(&queue->state_lock);
1465 queue->state = NVMET_TCP_Q_CONNECTING;
1466 INIT_LIST_HEAD(&queue->free_list);
1467 init_llist_head(&queue->resp_list);
1468 INIT_LIST_HEAD(&queue->resp_send_list);
1469
1470 queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL);
1471 if (queue->idx < 0) {
1472 ret = queue->idx;
1473 goto out_free_queue;
1474 }
1475
1476 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1477 if (ret)
1478 goto out_ida_remove;
1479
1480 ret = nvmet_sq_init(&queue->nvme_sq);
1481 if (ret)
1482 goto out_free_connect;
1483
1484 port->last_cpu = cpumask_next_wrap(port->last_cpu,
1485 cpu_online_mask, -1, false);
1486 queue->cpu = port->last_cpu;
1487 nvmet_prepare_receive_pdu(queue);
1488
1489 mutex_lock(&nvmet_tcp_queue_mutex);
1490 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1491 mutex_unlock(&nvmet_tcp_queue_mutex);
1492
1493 ret = nvmet_tcp_set_queue_sock(queue);
1494 if (ret)
1495 goto out_destroy_sq;
1496
1497 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1498
1499 return 0;
1500out_destroy_sq:
1501 mutex_lock(&nvmet_tcp_queue_mutex);
1502 list_del_init(&queue->queue_list);
1503 mutex_unlock(&nvmet_tcp_queue_mutex);
1504 nvmet_sq_destroy(&queue->nvme_sq);
1505out_free_connect:
1506 nvmet_tcp_free_cmd(&queue->connect);
1507out_ida_remove:
1508 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1509out_free_queue:
1510 kfree(queue);
1511 return ret;
1512}
1513
1514static void nvmet_tcp_accept_work(struct work_struct *w)
1515{
1516 struct nvmet_tcp_port *port =
1517 container_of(w, struct nvmet_tcp_port, accept_work);
1518 struct socket *newsock;
1519 int ret;
1520
1521 while (true) {
1522 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1523 if (ret < 0) {
1524 if (ret != -EAGAIN)
1525 pr_warn("failed to accept err=%d\n", ret);
1526 return;
1527 }
1528 ret = nvmet_tcp_alloc_queue(port, newsock);
1529 if (ret) {
1530 pr_err("failed to allocate queue\n");
1531 sock_release(newsock);
1532 }
1533 }
1534}
1535
1536static void nvmet_tcp_listen_data_ready(struct sock *sk)
1537{
1538 struct nvmet_tcp_port *port;
1539
1540 read_lock_bh(&sk->sk_callback_lock);
1541 port = sk->sk_user_data;
1542 if (!port)
1543 goto out;
1544
1545 if (sk->sk_state == TCP_LISTEN)
1546 schedule_work(&port->accept_work);
1547out:
1548 read_unlock_bh(&sk->sk_callback_lock);
1549}
1550
1551static int nvmet_tcp_add_port(struct nvmet_port *nport)
1552{
1553 struct nvmet_tcp_port *port;
1554 __kernel_sa_family_t af;
1555 int opt, ret;
1556
1557 port = kzalloc(sizeof(*port), GFP_KERNEL);
1558 if (!port)
1559 return -ENOMEM;
1560
1561 switch (nport->disc_addr.adrfam) {
1562 case NVMF_ADDR_FAMILY_IP4:
1563 af = AF_INET;
1564 break;
1565 case NVMF_ADDR_FAMILY_IP6:
1566 af = AF_INET6;
1567 break;
1568 default:
1569 pr_err("address family %d not supported\n",
1570 nport->disc_addr.adrfam);
1571 ret = -EINVAL;
1572 goto err_port;
1573 }
1574
1575 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1576 nport->disc_addr.trsvcid, &port->addr);
1577 if (ret) {
1578 pr_err("malformed ip/port passed: %s:%s\n",
1579 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1580 goto err_port;
1581 }
1582
1583 port->nport = nport;
1584 port->last_cpu = -1;
1585 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1586 if (port->nport->inline_data_size < 0)
1587 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1588
1589 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1590 IPPROTO_TCP, &port->sock);
1591 if (ret) {
1592 pr_err("failed to create a socket\n");
1593 goto err_port;
1594 }
1595
1596 port->sock->sk->sk_user_data = port;
1597 port->data_ready = port->sock->sk->sk_data_ready;
1598 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1599
1600 opt = 1;
1601 ret = kernel_setsockopt(port->sock, IPPROTO_TCP,
1602 TCP_NODELAY, (char *)&opt, sizeof(opt));
1603 if (ret) {
1604 pr_err("failed to set TCP_NODELAY sock opt %d\n", ret);
1605 goto err_sock;
1606 }
1607
1608 ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_REUSEADDR,
1609 (char *)&opt, sizeof(opt));
1610 if (ret) {
1611 pr_err("failed to set SO_REUSEADDR sock opt %d\n", ret);
1612 goto err_sock;
1613 }
1614
1615 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1616 sizeof(port->addr));
1617 if (ret) {
1618 pr_err("failed to bind port socket %d\n", ret);
1619 goto err_sock;
1620 }
1621
1622 ret = kernel_listen(port->sock, 128);
1623 if (ret) {
1624 pr_err("failed to listen %d on port sock\n", ret);
1625 goto err_sock;
1626 }
1627
1628 nport->priv = port;
1629 pr_info("enabling port %d (%pISpc)\n",
1630 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1631
1632 return 0;
1633
1634err_sock:
1635 sock_release(port->sock);
1636err_port:
1637 kfree(port);
1638 return ret;
1639}
1640
1641static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1642{
1643 struct nvmet_tcp_port *port = nport->priv;
1644
1645 write_lock_bh(&port->sock->sk->sk_callback_lock);
1646 port->sock->sk->sk_data_ready = port->data_ready;
1647 port->sock->sk->sk_user_data = NULL;
1648 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1649 cancel_work_sync(&port->accept_work);
1650
1651 sock_release(port->sock);
1652 kfree(port);
1653}
1654
1655static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1656{
1657 struct nvmet_tcp_queue *queue;
1658
1659 mutex_lock(&nvmet_tcp_queue_mutex);
1660 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1661 if (queue->nvme_sq.ctrl == ctrl)
1662 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1663 mutex_unlock(&nvmet_tcp_queue_mutex);
1664}
1665
1666static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1667{
1668 struct nvmet_tcp_queue *queue =
1669 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1670
1671 if (sq->qid == 0) {
1672 /* Let inflight controller teardown complete */
1673 flush_scheduled_work();
1674 }
1675
1676 queue->nr_cmds = sq->size * 2;
1677 if (nvmet_tcp_alloc_cmds(queue))
1678 return NVME_SC_INTERNAL;
1679 return 0;
1680}
1681
1682static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1683 struct nvmet_port *nport, char *traddr)
1684{
1685 struct nvmet_tcp_port *port = nport->priv;
1686
1687 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1688 struct nvmet_tcp_cmd *cmd =
1689 container_of(req, struct nvmet_tcp_cmd, req);
1690 struct nvmet_tcp_queue *queue = cmd->queue;
1691
1692 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1693 } else {
1694 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1695 }
1696}
1697
1698static struct nvmet_fabrics_ops nvmet_tcp_ops = {
1699 .owner = THIS_MODULE,
1700 .type = NVMF_TRTYPE_TCP,
1701 .msdbd = 1,
1702 .has_keyed_sgls = 0,
1703 .add_port = nvmet_tcp_add_port,
1704 .remove_port = nvmet_tcp_remove_port,
1705 .queue_response = nvmet_tcp_queue_response,
1706 .delete_ctrl = nvmet_tcp_delete_ctrl,
1707 .install_queue = nvmet_tcp_install_queue,
1708 .disc_traddr = nvmet_tcp_disc_port_addr,
1709};
1710
1711static int __init nvmet_tcp_init(void)
1712{
1713 int ret;
1714
1715 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1716 if (!nvmet_tcp_wq)
1717 return -ENOMEM;
1718
1719 ret = nvmet_register_transport(&nvmet_tcp_ops);
1720 if (ret)
1721 goto err;
1722
1723 return 0;
1724err:
1725 destroy_workqueue(nvmet_tcp_wq);
1726 return ret;
1727}
1728
1729static void __exit nvmet_tcp_exit(void)
1730{
1731 struct nvmet_tcp_queue *queue;
1732
1733 nvmet_unregister_transport(&nvmet_tcp_ops);
1734
1735 flush_scheduled_work();
1736 mutex_lock(&nvmet_tcp_queue_mutex);
1737 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1738 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1739 mutex_unlock(&nvmet_tcp_queue_mutex);
1740 flush_scheduled_work();
1741
1742 destroy_workqueue(nvmet_tcp_wq);
1743}
1744
1745module_init(nvmet_tcp_init);
1746module_exit(nvmet_tcp_exit);
1747
1748MODULE_LICENSE("GPL v2");
1749MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
Linux 6.x block layer and io_uring tree(s)