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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / nvme / target / tcp.c
blobaf674fc0bb1e48939376cabed1b53eb8f65f4c55
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
26 enum 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
34 enum 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
41 enum {
42 NVMET_TCP_F_INIT_FAILED = (1 << 0),
43 };
44
45 struct 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
77 enum nvmet_tcp_queue_state {
78 NVMET_TCP_Q_CONNECTING,
79 NVMET_TCP_Q_LIVE,
80 NVMET_TCP_Q_DISCONNECTING,
81 };
82
83 struct 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
132 struct 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
141 static DEFINE_IDA(nvmet_tcp_queue_ida);
142 static LIST_HEAD(nvmet_tcp_queue_list);
143 static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
144
145 static struct workqueue_struct *nvmet_tcp_wq;
146 static struct nvmet_fabrics_ops nvmet_tcp_ops;
147 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
148 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
149
150 static 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
156 static 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
162 static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
163 {
164 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
165 }
166
167 static 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 &&
171 !cmd->req.cqe->status;
172 }
173
174 static 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
180 static inline struct nvmet_tcp_cmd *
181 nvmet_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
199 static 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
207 static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
208 {
209 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
210 }
211
212 static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
213 {
214 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
215 }
216
217 static 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
227 static 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
253 static 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
270 static 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
281 static 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
309 static 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
318 static 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 (!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;
350 err:
351 sgl_free(cmd->req.sg);
352 return NVME_SC_INTERNAL;
353 }
354
355 static 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
363 static 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;
374 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
375 NVME_TCP_F_DATA_SUCCESS : 0);
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);
381 pdu->command_id = cmd->req.cqe->command_id;
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
396 static 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
421 static 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
441 static 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
459 static 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
485 static 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
495 static 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
518 static 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 {
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 }
552 }
553
554 if (queue->nvme_sq.sqhd_disabled) {
555 kfree(cmd->iov);
556 sgl_free(cmd->req.sg);
557 }
558
559 return 1;
560
561 }
562
563 static 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
593 static 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
619 static 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;
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 }
641 return 1;
642 }
643
644 static 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
683 done_send:
684 if (ret < 0) {
685 if (ret == -EAGAIN)
686 return 0;
687 return ret;
688 }
689
690 return 1;
691 }
692
693 static 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
708 static 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
716 static 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
725 static 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;
744 free_snd_hash:
745 ahash_request_free(queue->snd_hash);
746 free_tfm:
747 crypto_free_ahash(tfm);
748 return -ENOMEM;
749 }
750
751
752 static 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
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);
791 icresp->maxdata = cpu_to_le32(0xffff); /* FIXME: support r2t */
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;
807 free_crypto:
808 if (queue->hdr_digest || queue->data_digest)
809 nvmet_tcp_free_crypto(queue);
810 return ret;
811 }
812
813 static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
814 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
815 {
816 size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
817 int ret;
818
819 if (!nvme_is_write(cmd->req.cmd) ||
820 data_len > cmd->req.port->inline_data_size) {
821 nvmet_prepare_receive_pdu(queue);
822 return;
823 }
824
825 ret = nvmet_tcp_map_data(cmd);
826 if (unlikely(ret)) {
827 pr_err("queue %d: failed to map data\n", queue->idx);
828 nvmet_tcp_fatal_error(queue);
829 return;
830 }
831
832 queue->rcv_state = NVMET_TCP_RECV_DATA;
833 nvmet_tcp_map_pdu_iovec(cmd);
834 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
835 }
836
837 static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
838 {
839 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
840 struct nvmet_tcp_cmd *cmd;
841
842 cmd = &queue->cmds[data->ttag];
843
844 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
845 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
846 data->ttag, le32_to_cpu(data->data_offset),
847 cmd->rbytes_done);
848 /* FIXME: use path and transport errors */
849 nvmet_req_complete(&cmd->req,
850 NVME_SC_INVALID_FIELD | NVME_SC_DNR);
851 return -EPROTO;
852 }
853
854 cmd->pdu_len = le32_to_cpu(data->data_length);
855 cmd->pdu_recv = 0;
856 nvmet_tcp_map_pdu_iovec(cmd);
857 queue->cmd = cmd;
858 queue->rcv_state = NVMET_TCP_RECV_DATA;
859
860 return 0;
861 }
862
863 static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
864 {
865 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
866 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
867 struct nvmet_req *req;
868 int ret;
869
870 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
871 if (hdr->type != nvme_tcp_icreq) {
872 pr_err("unexpected pdu type (%d) before icreq\n",
873 hdr->type);
874 nvmet_tcp_fatal_error(queue);
875 return -EPROTO;
876 }
877 return nvmet_tcp_handle_icreq(queue);
878 }
879
880 if (hdr->type == nvme_tcp_h2c_data) {
881 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
882 if (unlikely(ret))
883 return ret;
884 return 0;
885 }
886
887 queue->cmd = nvmet_tcp_get_cmd(queue);
888 if (unlikely(!queue->cmd)) {
889 /* This should never happen */
890 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
891 queue->idx, queue->nr_cmds, queue->send_list_len,
892 nvme_cmd->common.opcode);
893 nvmet_tcp_fatal_error(queue);
894 return -ENOMEM;
895 }
896
897 req = &queue->cmd->req;
898 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
899
900 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
901 &queue->nvme_sq, &nvmet_tcp_ops))) {
902 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
903 req->cmd, req->cmd->common.command_id,
904 req->cmd->common.opcode,
905 le32_to_cpu(req->cmd->common.dptr.sgl.length));
906
907 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
908 return -EAGAIN;
909 }
910
911 ret = nvmet_tcp_map_data(queue->cmd);
912 if (unlikely(ret)) {
913 pr_err("queue %d: failed to map data\n", queue->idx);
914 if (nvmet_tcp_has_inline_data(queue->cmd))
915 nvmet_tcp_fatal_error(queue);
916 else
917 nvmet_req_complete(req, ret);
918 ret = -EAGAIN;
919 goto out;
920 }
921
922 if (nvmet_tcp_need_data_in(queue->cmd)) {
923 if (nvmet_tcp_has_inline_data(queue->cmd)) {
924 queue->rcv_state = NVMET_TCP_RECV_DATA;
925 nvmet_tcp_map_pdu_iovec(queue->cmd);
926 return 0;
927 }
928 /* send back R2T */
929 nvmet_tcp_queue_response(&queue->cmd->req);
930 goto out;
931 }
932
933 queue->cmd->req.execute(&queue->cmd->req);
934 out:
935 nvmet_prepare_receive_pdu(queue);
936 return ret;
937 }
938
939 static const u8 nvme_tcp_pdu_sizes[] = {
940 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
941 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
942 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
943 };
944
945 static inline u8 nvmet_tcp_pdu_size(u8 type)
946 {
947 size_t idx = type;
948
949 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
950 nvme_tcp_pdu_sizes[idx]) ?
951 nvme_tcp_pdu_sizes[idx] : 0;
952 }
953
954 static inline bool nvmet_tcp_pdu_valid(u8 type)
955 {
956 switch (type) {
957 case nvme_tcp_icreq:
958 case nvme_tcp_cmd:
959 case nvme_tcp_h2c_data:
960 /* fallthru */
961 return true;
962 }
963
964 return false;
965 }
966
967 static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
968 {
969 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
970 int len;
971 struct kvec iov;
972 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
973
974 recv:
975 iov.iov_base = (void *)&queue->pdu + queue->offset;
976 iov.iov_len = queue->left;
977 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
978 iov.iov_len, msg.msg_flags);
979 if (unlikely(len < 0))
980 return len;
981
982 queue->offset += len;
983 queue->left -= len;
984 if (queue->left)
985 return -EAGAIN;
986
987 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
988 u8 hdgst = nvmet_tcp_hdgst_len(queue);
989
990 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
991 pr_err("unexpected pdu type %d\n", hdr->type);
992 nvmet_tcp_fatal_error(queue);
993 return -EIO;
994 }
995
996 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
997 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
998 return -EIO;
999 }
1000
1001 queue->left = hdr->hlen - queue->offset + hdgst;
1002 goto recv;
1003 }
1004
1005 if (queue->hdr_digest &&
1006 nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) {
1007 nvmet_tcp_fatal_error(queue); /* fatal */
1008 return -EPROTO;
1009 }
1010
1011 if (queue->data_digest &&
1012 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1013 nvmet_tcp_fatal_error(queue); /* fatal */
1014 return -EPROTO;
1015 }
1016
1017 return nvmet_tcp_done_recv_pdu(queue);
1018 }
1019
1020 static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1021 {
1022 struct nvmet_tcp_queue *queue = cmd->queue;
1023
1024 nvmet_tcp_ddgst(queue->rcv_hash, cmd);
1025 queue->offset = 0;
1026 queue->left = NVME_TCP_DIGEST_LENGTH;
1027 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1028 }
1029
1030 static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1031 {
1032 struct nvmet_tcp_cmd *cmd = queue->cmd;
1033 int ret;
1034
1035 while (msg_data_left(&cmd->recv_msg)) {
1036 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1037 cmd->recv_msg.msg_flags);
1038 if (ret <= 0)
1039 return ret;
1040
1041 cmd->pdu_recv += ret;
1042 cmd->rbytes_done += ret;
1043 }
1044
1045 nvmet_tcp_unmap_pdu_iovec(cmd);
1046
1047 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1048 cmd->rbytes_done == cmd->req.transfer_len) {
1049 if (queue->data_digest) {
1050 nvmet_tcp_prep_recv_ddgst(cmd);
1051 return 0;
1052 }
1053 cmd->req.execute(&cmd->req);
1054 }
1055
1056 nvmet_prepare_receive_pdu(queue);
1057 return 0;
1058 }
1059
1060 static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1061 {
1062 struct nvmet_tcp_cmd *cmd = queue->cmd;
1063 int ret;
1064 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1065 struct kvec iov = {
1066 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1067 .iov_len = queue->left
1068 };
1069
1070 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1071 iov.iov_len, msg.msg_flags);
1072 if (unlikely(ret < 0))
1073 return ret;
1074
1075 queue->offset += ret;
1076 queue->left -= ret;
1077 if (queue->left)
1078 return -EAGAIN;
1079
1080 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1081 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1082 queue->idx, cmd->req.cmd->common.command_id,
1083 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1084 le32_to_cpu(cmd->exp_ddgst));
1085 nvmet_tcp_finish_cmd(cmd);
1086 nvmet_tcp_fatal_error(queue);
1087 ret = -EPROTO;
1088 goto out;
1089 }
1090
1091 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1092 cmd->rbytes_done == cmd->req.transfer_len)
1093 cmd->req.execute(&cmd->req);
1094 ret = 0;
1095 out:
1096 nvmet_prepare_receive_pdu(queue);
1097 return ret;
1098 }
1099
1100 static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1101 {
1102 int result = 0;
1103
1104 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1105 return 0;
1106
1107 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1108 result = nvmet_tcp_try_recv_pdu(queue);
1109 if (result != 0)
1110 goto done_recv;
1111 }
1112
1113 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1114 result = nvmet_tcp_try_recv_data(queue);
1115 if (result != 0)
1116 goto done_recv;
1117 }
1118
1119 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1120 result = nvmet_tcp_try_recv_ddgst(queue);
1121 if (result != 0)
1122 goto done_recv;
1123 }
1124
1125 done_recv:
1126 if (result < 0) {
1127 if (result == -EAGAIN)
1128 return 0;
1129 return result;
1130 }
1131 return 1;
1132 }
1133
1134 static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1135 int budget, int *recvs)
1136 {
1137 int i, ret = 0;
1138
1139 for (i = 0; i < budget; i++) {
1140 ret = nvmet_tcp_try_recv_one(queue);
1141 if (ret <= 0)
1142 break;
1143 (*recvs)++;
1144 }
1145
1146 return ret;
1147 }
1148
1149 static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1150 {
1151 spin_lock(&queue->state_lock);
1152 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1153 queue->state = NVMET_TCP_Q_DISCONNECTING;
1154 schedule_work(&queue->release_work);
1155 }
1156 spin_unlock(&queue->state_lock);
1157 }
1158
1159 static void nvmet_tcp_io_work(struct work_struct *w)
1160 {
1161 struct nvmet_tcp_queue *queue =
1162 container_of(w, struct nvmet_tcp_queue, io_work);
1163 bool pending;
1164 int ret, ops = 0;
1165
1166 do {
1167 pending = false;
1168
1169 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1170 if (ret > 0) {
1171 pending = true;
1172 } else if (ret < 0) {
1173 if (ret == -EPIPE || ret == -ECONNRESET)
1174 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1175 else
1176 nvmet_tcp_fatal_error(queue);
1177 return;
1178 }
1179
1180 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1181 if (ret > 0) {
1182 /* transmitted message/data */
1183 pending = true;
1184 } else if (ret < 0) {
1185 if (ret == -EPIPE || ret == -ECONNRESET)
1186 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1187 else
1188 nvmet_tcp_fatal_error(queue);
1189 return;
1190 }
1191
1192 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1193
1194 /*
1195 * We exahusted our budget, requeue our selves
1196 */
1197 if (pending)
1198 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1199 }
1200
1201 static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1202 struct nvmet_tcp_cmd *c)
1203 {
1204 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1205
1206 c->queue = queue;
1207 c->req.port = queue->port->nport;
1208
1209 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1210 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1211 if (!c->cmd_pdu)
1212 return -ENOMEM;
1213 c->req.cmd = &c->cmd_pdu->cmd;
1214
1215 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1216 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1217 if (!c->rsp_pdu)
1218 goto out_free_cmd;
1219 c->req.cqe = &c->rsp_pdu->cqe;
1220
1221 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1222 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1223 if (!c->data_pdu)
1224 goto out_free_rsp;
1225
1226 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1227 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1228 if (!c->r2t_pdu)
1229 goto out_free_data;
1230
1231 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1232
1233 list_add_tail(&c->entry, &queue->free_list);
1234
1235 return 0;
1236 out_free_data:
1237 page_frag_free(c->data_pdu);
1238 out_free_rsp:
1239 page_frag_free(c->rsp_pdu);
1240 out_free_cmd:
1241 page_frag_free(c->cmd_pdu);
1242 return -ENOMEM;
1243 }
1244
1245 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1246 {
1247 page_frag_free(c->r2t_pdu);
1248 page_frag_free(c->data_pdu);
1249 page_frag_free(c->rsp_pdu);
1250 page_frag_free(c->cmd_pdu);
1251 }
1252
1253 static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1254 {
1255 struct nvmet_tcp_cmd *cmds;
1256 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1257
1258 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1259 if (!cmds)
1260 goto out;
1261
1262 for (i = 0; i < nr_cmds; i++) {
1263 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1264 if (ret)
1265 goto out_free;
1266 }
1267
1268 queue->cmds = cmds;
1269
1270 return 0;
1271 out_free:
1272 while (--i >= 0)
1273 nvmet_tcp_free_cmd(cmds + i);
1274 kfree(cmds);
1275 out:
1276 return ret;
1277 }
1278
1279 static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1280 {
1281 struct nvmet_tcp_cmd *cmds = queue->cmds;
1282 int i;
1283
1284 for (i = 0; i < queue->nr_cmds; i++)
1285 nvmet_tcp_free_cmd(cmds + i);
1286
1287 nvmet_tcp_free_cmd(&queue->connect);
1288 kfree(cmds);
1289 }
1290
1291 static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1292 {
1293 struct socket *sock = queue->sock;
1294
1295 write_lock_bh(&sock->sk->sk_callback_lock);
1296 sock->sk->sk_data_ready = queue->data_ready;
1297 sock->sk->sk_state_change = queue->state_change;
1298 sock->sk->sk_write_space = queue->write_space;
1299 sock->sk->sk_user_data = NULL;
1300 write_unlock_bh(&sock->sk->sk_callback_lock);
1301 }
1302
1303 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1304 {
1305 nvmet_req_uninit(&cmd->req);
1306 nvmet_tcp_unmap_pdu_iovec(cmd);
1307 kfree(cmd->iov);
1308 sgl_free(cmd->req.sg);
1309 }
1310
1311 static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1312 {
1313 struct nvmet_tcp_cmd *cmd = queue->cmds;
1314 int i;
1315
1316 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1317 if (nvmet_tcp_need_data_in(cmd))
1318 nvmet_tcp_finish_cmd(cmd);
1319 }
1320
1321 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1322 /* failed in connect */
1323 nvmet_tcp_finish_cmd(&queue->connect);
1324 }
1325 }
1326
1327 static void nvmet_tcp_release_queue_work(struct work_struct *w)
1328 {
1329 struct nvmet_tcp_queue *queue =
1330 container_of(w, struct nvmet_tcp_queue, release_work);
1331
1332 mutex_lock(&nvmet_tcp_queue_mutex);
1333 list_del_init(&queue->queue_list);
1334 mutex_unlock(&nvmet_tcp_queue_mutex);
1335
1336 nvmet_tcp_restore_socket_callbacks(queue);
1337 flush_work(&queue->io_work);
1338
1339 nvmet_tcp_uninit_data_in_cmds(queue);
1340 nvmet_sq_destroy(&queue->nvme_sq);
1341 cancel_work_sync(&queue->io_work);
1342 sock_release(queue->sock);
1343 nvmet_tcp_free_cmds(queue);
1344 if (queue->hdr_digest || queue->data_digest)
1345 nvmet_tcp_free_crypto(queue);
1346 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1347
1348 kfree(queue);
1349 }
1350
1351 static void nvmet_tcp_data_ready(struct sock *sk)
1352 {
1353 struct nvmet_tcp_queue *queue;
1354
1355 read_lock_bh(&sk->sk_callback_lock);
1356 queue = sk->sk_user_data;
1357 if (likely(queue))
1358 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1359 read_unlock_bh(&sk->sk_callback_lock);
1360 }
1361
1362 static void nvmet_tcp_write_space(struct sock *sk)
1363 {
1364 struct nvmet_tcp_queue *queue;
1365
1366 read_lock_bh(&sk->sk_callback_lock);
1367 queue = sk->sk_user_data;
1368 if (unlikely(!queue))
1369 goto out;
1370
1371 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1372 queue->write_space(sk);
1373 goto out;
1374 }
1375
1376 if (sk_stream_is_writeable(sk)) {
1377 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1378 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1379 }
1380 out:
1381 read_unlock_bh(&sk->sk_callback_lock);
1382 }
1383
1384 static void nvmet_tcp_state_change(struct sock *sk)
1385 {
1386 struct nvmet_tcp_queue *queue;
1387
1388 write_lock_bh(&sk->sk_callback_lock);
1389 queue = sk->sk_user_data;
1390 if (!queue)
1391 goto done;
1392
1393 switch (sk->sk_state) {
1394 case TCP_FIN_WAIT1:
1395 case TCP_CLOSE_WAIT:
1396 case TCP_CLOSE:
1397 /* FALLTHRU */
1398 sk->sk_user_data = NULL;
1399 nvmet_tcp_schedule_release_queue(queue);
1400 break;
1401 default:
1402 pr_warn("queue %d unhandled state %d\n",
1403 queue->idx, sk->sk_state);
1404 }
1405 done:
1406 write_unlock_bh(&sk->sk_callback_lock);
1407 }
1408
1409 static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1410 {
1411 struct socket *sock = queue->sock;
1412 struct inet_sock *inet = inet_sk(sock->sk);
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 /* Set socket type of service */
1437 if (inet->rcv_tos > 0) {
1438 int tos = inet->rcv_tos;
1439
1440 ret = kernel_setsockopt(sock, SOL_IP, IP_TOS,
1441 (char *)&tos, sizeof(tos));
1442 if (ret)
1443 return ret;
1444 }
1445
1446 write_lock_bh(&sock->sk->sk_callback_lock);
1447 sock->sk->sk_user_data = queue;
1448 queue->data_ready = sock->sk->sk_data_ready;
1449 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1450 queue->state_change = sock->sk->sk_state_change;
1451 sock->sk->sk_state_change = nvmet_tcp_state_change;
1452 queue->write_space = sock->sk->sk_write_space;
1453 sock->sk->sk_write_space = nvmet_tcp_write_space;
1454 write_unlock_bh(&sock->sk->sk_callback_lock);
1455
1456 return 0;
1457 }
1458
1459 static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1460 struct socket *newsock)
1461 {
1462 struct nvmet_tcp_queue *queue;
1463 int ret;
1464
1465 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1466 if (!queue)
1467 return -ENOMEM;
1468
1469 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1470 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1471 queue->sock = newsock;
1472 queue->port = port;
1473 queue->nr_cmds = 0;
1474 spin_lock_init(&queue->state_lock);
1475 queue->state = NVMET_TCP_Q_CONNECTING;
1476 INIT_LIST_HEAD(&queue->free_list);
1477 init_llist_head(&queue->resp_list);
1478 INIT_LIST_HEAD(&queue->resp_send_list);
1479
1480 queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL);
1481 if (queue->idx < 0) {
1482 ret = queue->idx;
1483 goto out_free_queue;
1484 }
1485
1486 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1487 if (ret)
1488 goto out_ida_remove;
1489
1490 ret = nvmet_sq_init(&queue->nvme_sq);
1491 if (ret)
1492 goto out_free_connect;
1493
1494 port->last_cpu = cpumask_next_wrap(port->last_cpu,
1495 cpu_online_mask, -1, false);
1496 queue->cpu = port->last_cpu;
1497 nvmet_prepare_receive_pdu(queue);
1498
1499 mutex_lock(&nvmet_tcp_queue_mutex);
1500 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1501 mutex_unlock(&nvmet_tcp_queue_mutex);
1502
1503 ret = nvmet_tcp_set_queue_sock(queue);
1504 if (ret)
1505 goto out_destroy_sq;
1506
1507 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1508
1509 return 0;
1510 out_destroy_sq:
1511 mutex_lock(&nvmet_tcp_queue_mutex);
1512 list_del_init(&queue->queue_list);
1513 mutex_unlock(&nvmet_tcp_queue_mutex);
1514 nvmet_sq_destroy(&queue->nvme_sq);
1515 out_free_connect:
1516 nvmet_tcp_free_cmd(&queue->connect);
1517 out_ida_remove:
1518 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1519 out_free_queue:
1520 kfree(queue);
1521 return ret;
1522 }
1523
1524 static void nvmet_tcp_accept_work(struct work_struct *w)
1525 {
1526 struct nvmet_tcp_port *port =
1527 container_of(w, struct nvmet_tcp_port, accept_work);
1528 struct socket *newsock;
1529 int ret;
1530
1531 while (true) {
1532 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1533 if (ret < 0) {
1534 if (ret != -EAGAIN)
1535 pr_warn("failed to accept err=%d\n", ret);
1536 return;
1537 }
1538 ret = nvmet_tcp_alloc_queue(port, newsock);
1539 if (ret) {
1540 pr_err("failed to allocate queue\n");
1541 sock_release(newsock);
1542 }
1543 }
1544 }
1545
1546 static void nvmet_tcp_listen_data_ready(struct sock *sk)
1547 {
1548 struct nvmet_tcp_port *port;
1549
1550 read_lock_bh(&sk->sk_callback_lock);
1551 port = sk->sk_user_data;
1552 if (!port)
1553 goto out;
1554
1555 if (sk->sk_state == TCP_LISTEN)
1556 schedule_work(&port->accept_work);
1557 out:
1558 read_unlock_bh(&sk->sk_callback_lock);
1559 }
1560
1561 static int nvmet_tcp_add_port(struct nvmet_port *nport)
1562 {
1563 struct nvmet_tcp_port *port;
1564 __kernel_sa_family_t af;
1565 int opt, ret;
1566
1567 port = kzalloc(sizeof(*port), GFP_KERNEL);
1568 if (!port)
1569 return -ENOMEM;
1570
1571 switch (nport->disc_addr.adrfam) {
1572 case NVMF_ADDR_FAMILY_IP4:
1573 af = AF_INET;
1574 break;
1575 case NVMF_ADDR_FAMILY_IP6:
1576 af = AF_INET6;
1577 break;
1578 default:
1579 pr_err("address family %d not supported\n",
1580 nport->disc_addr.adrfam);
1581 ret = -EINVAL;
1582 goto err_port;
1583 }
1584
1585 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1586 nport->disc_addr.trsvcid, &port->addr);
1587 if (ret) {
1588 pr_err("malformed ip/port passed: %s:%s\n",
1589 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1590 goto err_port;
1591 }
1592
1593 port->nport = nport;
1594 port->last_cpu = -1;
1595 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1596 if (port->nport->inline_data_size < 0)
1597 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1598
1599 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1600 IPPROTO_TCP, &port->sock);
1601 if (ret) {
1602 pr_err("failed to create a socket\n");
1603 goto err_port;
1604 }
1605
1606 port->sock->sk->sk_user_data = port;
1607 port->data_ready = port->sock->sk->sk_data_ready;
1608 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1609
1610 opt = 1;
1611 ret = kernel_setsockopt(port->sock, IPPROTO_TCP,
1612 TCP_NODELAY, (char *)&opt, sizeof(opt));
1613 if (ret) {
1614 pr_err("failed to set TCP_NODELAY sock opt %d\n", ret);
1615 goto err_sock;
1616 }
1617
1618 ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_REUSEADDR,
1619 (char *)&opt, sizeof(opt));
1620 if (ret) {
1621 pr_err("failed to set SO_REUSEADDR sock opt %d\n", ret);
1622 goto err_sock;
1623 }
1624
1625 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1626 sizeof(port->addr));
1627 if (ret) {
1628 pr_err("failed to bind port socket %d\n", ret);
1629 goto err_sock;
1630 }
1631
1632 ret = kernel_listen(port->sock, 128);
1633 if (ret) {
1634 pr_err("failed to listen %d on port sock\n", ret);
1635 goto err_sock;
1636 }
1637
1638 nport->priv = port;
1639 pr_info("enabling port %d (%pISpc)\n",
1640 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1641
1642 return 0;
1643
1644 err_sock:
1645 sock_release(port->sock);
1646 err_port:
1647 kfree(port);
1648 return ret;
1649 }
1650
1651 static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1652 {
1653 struct nvmet_tcp_port *port = nport->priv;
1654
1655 write_lock_bh(&port->sock->sk->sk_callback_lock);
1656 port->sock->sk->sk_data_ready = port->data_ready;
1657 port->sock->sk->sk_user_data = NULL;
1658 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1659 cancel_work_sync(&port->accept_work);
1660
1661 sock_release(port->sock);
1662 kfree(port);
1663 }
1664
1665 static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1666 {
1667 struct nvmet_tcp_queue *queue;
1668
1669 mutex_lock(&nvmet_tcp_queue_mutex);
1670 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1671 if (queue->nvme_sq.ctrl == ctrl)
1672 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1673 mutex_unlock(&nvmet_tcp_queue_mutex);
1674 }
1675
1676 static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1677 {
1678 struct nvmet_tcp_queue *queue =
1679 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1680
1681 if (sq->qid == 0) {
1682 /* Let inflight controller teardown complete */
1683 flush_scheduled_work();
1684 }
1685
1686 queue->nr_cmds = sq->size * 2;
1687 if (nvmet_tcp_alloc_cmds(queue))
1688 return NVME_SC_INTERNAL;
1689 return 0;
1690 }
1691
1692 static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1693 struct nvmet_port *nport, char *traddr)
1694 {
1695 struct nvmet_tcp_port *port = nport->priv;
1696
1697 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1698 struct nvmet_tcp_cmd *cmd =
1699 container_of(req, struct nvmet_tcp_cmd, req);
1700 struct nvmet_tcp_queue *queue = cmd->queue;
1701
1702 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1703 } else {
1704 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1705 }
1706 }
1707
1708 static struct nvmet_fabrics_ops nvmet_tcp_ops = {
1709 .owner = THIS_MODULE,
1710 .type = NVMF_TRTYPE_TCP,
1711 .msdbd = 1,
1712 .has_keyed_sgls = 0,
1713 .add_port = nvmet_tcp_add_port,
1714 .remove_port = nvmet_tcp_remove_port,
1715 .queue_response = nvmet_tcp_queue_response,
1716 .delete_ctrl = nvmet_tcp_delete_ctrl,
1717 .install_queue = nvmet_tcp_install_queue,
1718 .disc_traddr = nvmet_tcp_disc_port_addr,
1719 };
1720
1721 static int __init nvmet_tcp_init(void)
1722 {
1723 int ret;
1724
1725 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1726 if (!nvmet_tcp_wq)
1727 return -ENOMEM;
1728
1729 ret = nvmet_register_transport(&nvmet_tcp_ops);
1730 if (ret)
1731 goto err;
1732
1733 return 0;
1734 err:
1735 destroy_workqueue(nvmet_tcp_wq);
1736 return ret;
1737 }
1738
1739 static void __exit nvmet_tcp_exit(void)
1740 {
1741 struct nvmet_tcp_queue *queue;
1742
1743 nvmet_unregister_transport(&nvmet_tcp_ops);
1744
1745 flush_scheduled_work();
1746 mutex_lock(&nvmet_tcp_queue_mutex);
1747 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1748 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1749 mutex_unlock(&nvmet_tcp_queue_mutex);
1750 flush_scheduled_work();
1751
1752 destroy_workqueue(nvmet_tcp_wq);
1753 }
1754
1755 module_init(nvmet_tcp_init);
1756 module_exit(nvmet_tcp_exit);
1757
1758 MODULE_LICENSE("GPL v2");
1759 MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
Linux with added FPC-III support