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 the socket priority to use for connections were it is desirable
23 * that the NIC consider performing optimized packet processing or filtering.
24 * A non-zero value being sufficient to indicate general consideration of any
25 * possible optimization. Making it a module param allows for alternative
26 * values that may be unique for some NIC implementations.
27 */
28 static int so_priority;
29 module_param(so_priority, int, 0644);
30 MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
31
32 /* Define a time period (in usecs) that io_work() shall sample an activated
33 * queue before determining it to be idle. This optional module behavior
34 * can enable NIC solutions that support socket optimized packet processing
35 * using advanced interrupt moderation techniques.
36 */
37 static int idle_poll_period_usecs;
38 module_param(idle_poll_period_usecs, int, 0644);
39 MODULE_PARM_DESC(idle_poll_period_usecs,
40 "nvmet tcp io_work poll till idle time period in usecs");
41
42 #define NVMET_TCP_RECV_BUDGET 8
43 #define NVMET_TCP_SEND_BUDGET 8
44 #define NVMET_TCP_IO_WORK_BUDGET 64
45
46 enum nvmet_tcp_send_state {
47 NVMET_TCP_SEND_DATA_PDU,
48 NVMET_TCP_SEND_DATA,
49 NVMET_TCP_SEND_R2T,
50 NVMET_TCP_SEND_DDGST,
51 NVMET_TCP_SEND_RESPONSE
52 };
53
54 enum nvmet_tcp_recv_state {
55 NVMET_TCP_RECV_PDU,
56 NVMET_TCP_RECV_DATA,
57 NVMET_TCP_RECV_DDGST,
58 NVMET_TCP_RECV_ERR,
59 };
60
61 enum {
62 NVMET_TCP_F_INIT_FAILED = (1 << 0),
63 };
64
65 struct nvmet_tcp_cmd {
66 struct nvmet_tcp_queue *queue;
67 struct nvmet_req req;
68
69 struct nvme_tcp_cmd_pdu *cmd_pdu;
70 struct nvme_tcp_rsp_pdu *rsp_pdu;
71 struct nvme_tcp_data_pdu *data_pdu;
72 struct nvme_tcp_r2t_pdu *r2t_pdu;
73
74 u32 rbytes_done;
75 u32 wbytes_done;
76
77 u32 pdu_len;
78 u32 pdu_recv;
79 int sg_idx;
80 int nr_mapped;
81 struct msghdr recv_msg;
82 struct kvec *iov;
83 u32 flags;
84
85 struct list_head entry;
86 struct llist_node lentry;
87
88 /* send state */
89 u32 offset;
90 struct scatterlist *cur_sg;
91 enum nvmet_tcp_send_state state;
92
93 __le32 exp_ddgst;
94 __le32 recv_ddgst;
95 };
96
97 enum nvmet_tcp_queue_state {
98 NVMET_TCP_Q_CONNECTING,
99 NVMET_TCP_Q_LIVE,
100 NVMET_TCP_Q_DISCONNECTING,
101 };
102
103 struct nvmet_tcp_queue {
104 struct socket *sock;
105 struct nvmet_tcp_port *port;
106 struct work_struct io_work;
107 struct nvmet_cq nvme_cq;
108 struct nvmet_sq nvme_sq;
109
110 /* send state */
111 struct nvmet_tcp_cmd *cmds;
112 unsigned int nr_cmds;
113 struct list_head free_list;
114 struct llist_head resp_list;
115 struct list_head resp_send_list;
116 int send_list_len;
117 struct nvmet_tcp_cmd *snd_cmd;
118
119 /* recv state */
120 int offset;
121 int left;
122 enum nvmet_tcp_recv_state rcv_state;
123 struct nvmet_tcp_cmd *cmd;
124 union nvme_tcp_pdu pdu;
125
126 /* digest state */
127 bool hdr_digest;
128 bool data_digest;
129 struct ahash_request *snd_hash;
130 struct ahash_request *rcv_hash;
131
132 unsigned long poll_end;
133
134 spinlock_t state_lock;
135 enum nvmet_tcp_queue_state state;
136
137 struct sockaddr_storage sockaddr;
138 struct sockaddr_storage sockaddr_peer;
139 struct work_struct release_work;
140
141 int idx;
142 struct list_head queue_list;
143
144 struct nvmet_tcp_cmd connect;
145
146 struct page_frag_cache pf_cache;
147
148 void (*data_ready)(struct sock *);
149 void (*state_change)(struct sock *);
150 void (*write_space)(struct sock *);
151 };
152
153 struct nvmet_tcp_port {
154 struct socket *sock;
155 struct work_struct accept_work;
156 struct nvmet_port *nport;
157 struct sockaddr_storage addr;
158 void (*data_ready)(struct sock *);
159 };
160
161 static DEFINE_IDA(nvmet_tcp_queue_ida);
162 static LIST_HEAD(nvmet_tcp_queue_list);
163 static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
164
165 static struct workqueue_struct *nvmet_tcp_wq;
166 static const struct nvmet_fabrics_ops nvmet_tcp_ops;
167 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
168 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
169
nvmet_tcp_cmd_tag(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * cmd)170 static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
171 struct nvmet_tcp_cmd *cmd)
172 {
173 if (unlikely(!queue->nr_cmds)) {
174 /* We didn't allocate cmds yet, send 0xffff */
175 return USHRT_MAX;
176 }
177
178 return cmd - queue->cmds;
179 }
180
nvmet_tcp_has_data_in(struct nvmet_tcp_cmd * cmd)181 static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
182 {
183 return nvme_is_write(cmd->req.cmd) &&
184 cmd->rbytes_done < cmd->req.transfer_len;
185 }
186
nvmet_tcp_need_data_in(struct nvmet_tcp_cmd * cmd)187 static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
188 {
189 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
190 }
191
nvmet_tcp_need_data_out(struct nvmet_tcp_cmd * cmd)192 static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
193 {
194 return !nvme_is_write(cmd->req.cmd) &&
195 cmd->req.transfer_len > 0 &&
196 !cmd->req.cqe->status;
197 }
198
nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd * cmd)199 static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
200 {
201 return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
202 !cmd->rbytes_done;
203 }
204
205 static inline struct nvmet_tcp_cmd *
nvmet_tcp_get_cmd(struct nvmet_tcp_queue * queue)206 nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
207 {
208 struct nvmet_tcp_cmd *cmd;
209
210 cmd = list_first_entry_or_null(&queue->free_list,
211 struct nvmet_tcp_cmd, entry);
212 if (!cmd)
213 return NULL;
214 list_del_init(&cmd->entry);
215
216 cmd->rbytes_done = cmd->wbytes_done = 0;
217 cmd->pdu_len = 0;
218 cmd->pdu_recv = 0;
219 cmd->iov = NULL;
220 cmd->flags = 0;
221 return cmd;
222 }
223
nvmet_tcp_put_cmd(struct nvmet_tcp_cmd * cmd)224 static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
225 {
226 if (unlikely(cmd == &cmd->queue->connect))
227 return;
228
229 list_add_tail(&cmd->entry, &cmd->queue->free_list);
230 }
231
queue_cpu(struct nvmet_tcp_queue * queue)232 static inline int queue_cpu(struct nvmet_tcp_queue *queue)
233 {
234 return queue->sock->sk->sk_incoming_cpu;
235 }
236
nvmet_tcp_hdgst_len(struct nvmet_tcp_queue * queue)237 static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
238 {
239 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
240 }
241
nvmet_tcp_ddgst_len(struct nvmet_tcp_queue * queue)242 static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
243 {
244 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
245 }
246
nvmet_tcp_hdgst(struct ahash_request * hash,void * pdu,size_t len)247 static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
248 void *pdu, size_t len)
249 {
250 struct scatterlist sg;
251
252 sg_init_one(&sg, pdu, len);
253 ahash_request_set_crypt(hash, &sg, pdu + len, len);
254 crypto_ahash_digest(hash);
255 }
256
nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue * queue,void * pdu,size_t len)257 static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
258 void *pdu, size_t len)
259 {
260 struct nvme_tcp_hdr *hdr = pdu;
261 __le32 recv_digest;
262 __le32 exp_digest;
263
264 if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
265 pr_err("queue %d: header digest enabled but no header digest\n",
266 queue->idx);
267 return -EPROTO;
268 }
269
270 recv_digest = *(__le32 *)(pdu + hdr->hlen);
271 nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
272 exp_digest = *(__le32 *)(pdu + hdr->hlen);
273 if (recv_digest != exp_digest) {
274 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
275 queue->idx, le32_to_cpu(recv_digest),
276 le32_to_cpu(exp_digest));
277 return -EPROTO;
278 }
279
280 return 0;
281 }
282
nvmet_tcp_check_ddgst(struct nvmet_tcp_queue * queue,void * pdu)283 static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
284 {
285 struct nvme_tcp_hdr *hdr = pdu;
286 u8 digest_len = nvmet_tcp_hdgst_len(queue);
287 u32 len;
288
289 len = le32_to_cpu(hdr->plen) - hdr->hlen -
290 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
291
292 if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
293 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
294 return -EPROTO;
295 }
296
297 return 0;
298 }
299
nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd * cmd)300 static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
301 {
302 struct scatterlist *sg;
303 int i;
304
305 sg = &cmd->req.sg[cmd->sg_idx];
306
307 for (i = 0; i < cmd->nr_mapped; i++)
308 kunmap(sg_page(&sg[i]));
309 }
310
nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd * cmd)311 static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
312 {
313 struct kvec *iov = cmd->iov;
314 struct scatterlist *sg;
315 u32 length, offset, sg_offset;
316
317 length = cmd->pdu_len;
318 cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
319 offset = cmd->rbytes_done;
320 cmd->sg_idx = offset / PAGE_SIZE;
321 sg_offset = offset % PAGE_SIZE;
322 sg = &cmd->req.sg[cmd->sg_idx];
323
324 while (length) {
325 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
326
327 iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
328 iov->iov_len = iov_len;
329
330 length -= iov_len;
331 sg = sg_next(sg);
332 iov++;
333 sg_offset = 0;
334 }
335
336 iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
337 cmd->nr_mapped, cmd->pdu_len);
338 }
339
nvmet_tcp_fatal_error(struct nvmet_tcp_queue * queue)340 static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
341 {
342 queue->rcv_state = NVMET_TCP_RECV_ERR;
343 if (queue->nvme_sq.ctrl)
344 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
345 else
346 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
347 }
348
nvmet_tcp_socket_error(struct nvmet_tcp_queue * queue,int status)349 static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
350 {
351 if (status == -EPIPE || status == -ECONNRESET)
352 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
353 else
354 nvmet_tcp_fatal_error(queue);
355 }
356
nvmet_tcp_map_data(struct nvmet_tcp_cmd * cmd)357 static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
358 {
359 struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
360 u32 len = le32_to_cpu(sgl->length);
361
362 if (!len)
363 return 0;
364
365 if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
366 NVME_SGL_FMT_OFFSET)) {
367 if (!nvme_is_write(cmd->req.cmd))
368 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
369
370 if (len > cmd->req.port->inline_data_size)
371 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
372 cmd->pdu_len = len;
373 }
374 cmd->req.transfer_len += len;
375
376 cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
377 if (!cmd->req.sg)
378 return NVME_SC_INTERNAL;
379 cmd->cur_sg = cmd->req.sg;
380
381 if (nvmet_tcp_has_data_in(cmd)) {
382 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
383 sizeof(*cmd->iov), GFP_KERNEL);
384 if (!cmd->iov)
385 goto err;
386 }
387
388 return 0;
389 err:
390 sgl_free(cmd->req.sg);
391 return NVME_SC_INTERNAL;
392 }
393
nvmet_tcp_send_ddgst(struct ahash_request * hash,struct nvmet_tcp_cmd * cmd)394 static void nvmet_tcp_send_ddgst(struct ahash_request *hash,
395 struct nvmet_tcp_cmd *cmd)
396 {
397 ahash_request_set_crypt(hash, cmd->req.sg,
398 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
399 crypto_ahash_digest(hash);
400 }
401
nvmet_tcp_recv_ddgst(struct ahash_request * hash,struct nvmet_tcp_cmd * cmd)402 static void nvmet_tcp_recv_ddgst(struct ahash_request *hash,
403 struct nvmet_tcp_cmd *cmd)
404 {
405 struct scatterlist sg;
406 struct kvec *iov;
407 int i;
408
409 crypto_ahash_init(hash);
410 for (i = 0, iov = cmd->iov; i < cmd->nr_mapped; i++, iov++) {
411 sg_init_one(&sg, iov->iov_base, iov->iov_len);
412 ahash_request_set_crypt(hash, &sg, NULL, iov->iov_len);
413 crypto_ahash_update(hash);
414 }
415 ahash_request_set_crypt(hash, NULL, (void *)&cmd->exp_ddgst, 0);
416 crypto_ahash_final(hash);
417 }
418
nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd * cmd)419 static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
420 {
421 struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
422 struct nvmet_tcp_queue *queue = cmd->queue;
423 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
424 u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
425
426 cmd->offset = 0;
427 cmd->state = NVMET_TCP_SEND_DATA_PDU;
428
429 pdu->hdr.type = nvme_tcp_c2h_data;
430 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
431 NVME_TCP_F_DATA_SUCCESS : 0);
432 pdu->hdr.hlen = sizeof(*pdu);
433 pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
434 pdu->hdr.plen =
435 cpu_to_le32(pdu->hdr.hlen + hdgst +
436 cmd->req.transfer_len + ddgst);
437 pdu->command_id = cmd->req.cqe->command_id;
438 pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
439 pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
440
441 if (queue->data_digest) {
442 pdu->hdr.flags |= NVME_TCP_F_DDGST;
443 nvmet_tcp_send_ddgst(queue->snd_hash, cmd);
444 }
445
446 if (cmd->queue->hdr_digest) {
447 pdu->hdr.flags |= NVME_TCP_F_HDGST;
448 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
449 }
450 }
451
nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd * cmd)452 static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
453 {
454 struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
455 struct nvmet_tcp_queue *queue = cmd->queue;
456 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
457
458 cmd->offset = 0;
459 cmd->state = NVMET_TCP_SEND_R2T;
460
461 pdu->hdr.type = nvme_tcp_r2t;
462 pdu->hdr.flags = 0;
463 pdu->hdr.hlen = sizeof(*pdu);
464 pdu->hdr.pdo = 0;
465 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
466
467 pdu->command_id = cmd->req.cmd->common.command_id;
468 pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
469 pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
470 pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
471 if (cmd->queue->hdr_digest) {
472 pdu->hdr.flags |= NVME_TCP_F_HDGST;
473 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
474 }
475 }
476
nvmet_setup_response_pdu(struct nvmet_tcp_cmd * cmd)477 static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
478 {
479 struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
480 struct nvmet_tcp_queue *queue = cmd->queue;
481 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
482
483 cmd->offset = 0;
484 cmd->state = NVMET_TCP_SEND_RESPONSE;
485
486 pdu->hdr.type = nvme_tcp_rsp;
487 pdu->hdr.flags = 0;
488 pdu->hdr.hlen = sizeof(*pdu);
489 pdu->hdr.pdo = 0;
490 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
491 if (cmd->queue->hdr_digest) {
492 pdu->hdr.flags |= NVME_TCP_F_HDGST;
493 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
494 }
495 }
496
nvmet_tcp_process_resp_list(struct nvmet_tcp_queue * queue)497 static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
498 {
499 struct llist_node *node;
500 struct nvmet_tcp_cmd *cmd;
501
502 for (node = llist_del_all(&queue->resp_list); node; node = node->next) {
503 cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry);
504 list_add(&cmd->entry, &queue->resp_send_list);
505 queue->send_list_len++;
506 }
507 }
508
nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue * queue)509 static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
510 {
511 queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
512 struct nvmet_tcp_cmd, entry);
513 if (!queue->snd_cmd) {
514 nvmet_tcp_process_resp_list(queue);
515 queue->snd_cmd =
516 list_first_entry_or_null(&queue->resp_send_list,
517 struct nvmet_tcp_cmd, entry);
518 if (unlikely(!queue->snd_cmd))
519 return NULL;
520 }
521
522 list_del_init(&queue->snd_cmd->entry);
523 queue->send_list_len--;
524
525 if (nvmet_tcp_need_data_out(queue->snd_cmd))
526 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
527 else if (nvmet_tcp_need_data_in(queue->snd_cmd))
528 nvmet_setup_r2t_pdu(queue->snd_cmd);
529 else
530 nvmet_setup_response_pdu(queue->snd_cmd);
531
532 return queue->snd_cmd;
533 }
534
nvmet_tcp_queue_response(struct nvmet_req * req)535 static void nvmet_tcp_queue_response(struct nvmet_req *req)
536 {
537 struct nvmet_tcp_cmd *cmd =
538 container_of(req, struct nvmet_tcp_cmd, req);
539 struct nvmet_tcp_queue *queue = cmd->queue;
540 struct nvme_sgl_desc *sgl;
541 u32 len;
542
543 if (unlikely(cmd == queue->cmd)) {
544 sgl = &cmd->req.cmd->common.dptr.sgl;
545 len = le32_to_cpu(sgl->length);
546
547 /*
548 * Wait for inline data before processing the response.
549 * Avoid using helpers, this might happen before
550 * nvmet_req_init is completed.
551 */
552 if (queue->rcv_state == NVMET_TCP_RECV_PDU &&
553 len && len < cmd->req.port->inline_data_size &&
554 nvme_is_write(cmd->req.cmd))
555 return;
556 }
557
558 llist_add(&cmd->lentry, &queue->resp_list);
559 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &cmd->queue->io_work);
560 }
561
nvmet_tcp_execute_request(struct nvmet_tcp_cmd * cmd)562 static void nvmet_tcp_execute_request(struct nvmet_tcp_cmd *cmd)
563 {
564 if (unlikely(cmd->flags & NVMET_TCP_F_INIT_FAILED))
565 nvmet_tcp_queue_response(&cmd->req);
566 else
567 cmd->req.execute(&cmd->req);
568 }
569
nvmet_try_send_data_pdu(struct nvmet_tcp_cmd * cmd)570 static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
571 {
572 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
573 int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
574 int ret;
575
576 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
577 offset_in_page(cmd->data_pdu) + cmd->offset,
578 left, MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
579 if (ret <= 0)
580 return ret;
581
582 cmd->offset += ret;
583 left -= ret;
584
585 if (left)
586 return -EAGAIN;
587
588 cmd->state = NVMET_TCP_SEND_DATA;
589 cmd->offset = 0;
590 return 1;
591 }
592
nvmet_try_send_data(struct nvmet_tcp_cmd * cmd,bool last_in_batch)593 static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
594 {
595 struct nvmet_tcp_queue *queue = cmd->queue;
596 int ret;
597
598 while (cmd->cur_sg) {
599 struct page *page = sg_page(cmd->cur_sg);
600 u32 left = cmd->cur_sg->length - cmd->offset;
601 int flags = MSG_DONTWAIT;
602
603 if ((!last_in_batch && cmd->queue->send_list_len) ||
604 cmd->wbytes_done + left < cmd->req.transfer_len ||
605 queue->data_digest || !queue->nvme_sq.sqhd_disabled)
606 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
607
608 ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
609 left, flags);
610 if (ret <= 0)
611 return ret;
612
613 cmd->offset += ret;
614 cmd->wbytes_done += ret;
615
616 /* Done with sg?*/
617 if (cmd->offset == cmd->cur_sg->length) {
618 cmd->cur_sg = sg_next(cmd->cur_sg);
619 cmd->offset = 0;
620 }
621 }
622
623 if (queue->data_digest) {
624 cmd->state = NVMET_TCP_SEND_DDGST;
625 cmd->offset = 0;
626 } else {
627 if (queue->nvme_sq.sqhd_disabled) {
628 cmd->queue->snd_cmd = NULL;
629 nvmet_tcp_put_cmd(cmd);
630 } else {
631 nvmet_setup_response_pdu(cmd);
632 }
633 }
634
635 if (queue->nvme_sq.sqhd_disabled) {
636 kfree(cmd->iov);
637 sgl_free(cmd->req.sg);
638 }
639
640 return 1;
641
642 }
643
nvmet_try_send_response(struct nvmet_tcp_cmd * cmd,bool last_in_batch)644 static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
645 bool last_in_batch)
646 {
647 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
648 int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
649 int flags = MSG_DONTWAIT;
650 int ret;
651
652 if (!last_in_batch && cmd->queue->send_list_len)
653 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
654 else
655 flags |= MSG_EOR;
656
657 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu),
658 offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags);
659 if (ret <= 0)
660 return ret;
661 cmd->offset += ret;
662 left -= ret;
663
664 if (left)
665 return -EAGAIN;
666
667 kfree(cmd->iov);
668 sgl_free(cmd->req.sg);
669 cmd->queue->snd_cmd = NULL;
670 nvmet_tcp_put_cmd(cmd);
671 return 1;
672 }
673
nvmet_try_send_r2t(struct nvmet_tcp_cmd * cmd,bool last_in_batch)674 static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
675 {
676 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
677 int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
678 int flags = MSG_DONTWAIT;
679 int ret;
680
681 if (!last_in_batch && cmd->queue->send_list_len)
682 flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
683 else
684 flags |= MSG_EOR;
685
686 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu),
687 offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags);
688 if (ret <= 0)
689 return ret;
690 cmd->offset += ret;
691 left -= ret;
692
693 if (left)
694 return -EAGAIN;
695
696 cmd->queue->snd_cmd = NULL;
697 return 1;
698 }
699
nvmet_try_send_ddgst(struct nvmet_tcp_cmd * cmd,bool last_in_batch)700 static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
701 {
702 struct nvmet_tcp_queue *queue = cmd->queue;
703 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
704 struct kvec iov = {
705 .iov_base = &cmd->exp_ddgst + cmd->offset,
706 .iov_len = NVME_TCP_DIGEST_LENGTH - cmd->offset
707 };
708 int ret;
709
710 if (!last_in_batch && cmd->queue->send_list_len)
711 msg.msg_flags |= MSG_MORE;
712 else
713 msg.msg_flags |= MSG_EOR;
714
715 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
716 if (unlikely(ret <= 0))
717 return ret;
718
719 cmd->offset += ret;
720
721 if (queue->nvme_sq.sqhd_disabled) {
722 cmd->queue->snd_cmd = NULL;
723 nvmet_tcp_put_cmd(cmd);
724 } else {
725 nvmet_setup_response_pdu(cmd);
726 }
727 return 1;
728 }
729
nvmet_tcp_try_send_one(struct nvmet_tcp_queue * queue,bool last_in_batch)730 static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
731 bool last_in_batch)
732 {
733 struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
734 int ret = 0;
735
736 if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
737 cmd = nvmet_tcp_fetch_cmd(queue);
738 if (unlikely(!cmd))
739 return 0;
740 }
741
742 if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
743 ret = nvmet_try_send_data_pdu(cmd);
744 if (ret <= 0)
745 goto done_send;
746 }
747
748 if (cmd->state == NVMET_TCP_SEND_DATA) {
749 ret = nvmet_try_send_data(cmd, last_in_batch);
750 if (ret <= 0)
751 goto done_send;
752 }
753
754 if (cmd->state == NVMET_TCP_SEND_DDGST) {
755 ret = nvmet_try_send_ddgst(cmd, last_in_batch);
756 if (ret <= 0)
757 goto done_send;
758 }
759
760 if (cmd->state == NVMET_TCP_SEND_R2T) {
761 ret = nvmet_try_send_r2t(cmd, last_in_batch);
762 if (ret <= 0)
763 goto done_send;
764 }
765
766 if (cmd->state == NVMET_TCP_SEND_RESPONSE)
767 ret = nvmet_try_send_response(cmd, last_in_batch);
768
769 done_send:
770 if (ret < 0) {
771 if (ret == -EAGAIN)
772 return 0;
773 return ret;
774 }
775
776 return 1;
777 }
778
nvmet_tcp_try_send(struct nvmet_tcp_queue * queue,int budget,int * sends)779 static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
780 int budget, int *sends)
781 {
782 int i, ret = 0;
783
784 for (i = 0; i < budget; i++) {
785 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
786 if (unlikely(ret < 0)) {
787 nvmet_tcp_socket_error(queue, ret);
788 goto done;
789 } else if (ret == 0) {
790 break;
791 }
792 (*sends)++;
793 }
794 done:
795 return ret;
796 }
797
nvmet_prepare_receive_pdu(struct nvmet_tcp_queue * queue)798 static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
799 {
800 queue->offset = 0;
801 queue->left = sizeof(struct nvme_tcp_hdr);
802 queue->cmd = NULL;
803 queue->rcv_state = NVMET_TCP_RECV_PDU;
804 }
805
nvmet_tcp_free_crypto(struct nvmet_tcp_queue * queue)806 static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
807 {
808 struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
809
810 ahash_request_free(queue->rcv_hash);
811 ahash_request_free(queue->snd_hash);
812 crypto_free_ahash(tfm);
813 }
814
nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue * queue)815 static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
816 {
817 struct crypto_ahash *tfm;
818
819 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
820 if (IS_ERR(tfm))
821 return PTR_ERR(tfm);
822
823 queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
824 if (!queue->snd_hash)
825 goto free_tfm;
826 ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
827
828 queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
829 if (!queue->rcv_hash)
830 goto free_snd_hash;
831 ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
832
833 return 0;
834 free_snd_hash:
835 ahash_request_free(queue->snd_hash);
836 free_tfm:
837 crypto_free_ahash(tfm);
838 return -ENOMEM;
839 }
840
841
nvmet_tcp_handle_icreq(struct nvmet_tcp_queue * queue)842 static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
843 {
844 struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
845 struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
846 struct msghdr msg = {};
847 struct kvec iov;
848 int ret;
849
850 if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
851 pr_err("bad nvme-tcp pdu length (%d)\n",
852 le32_to_cpu(icreq->hdr.plen));
853 nvmet_tcp_fatal_error(queue);
854 }
855
856 if (icreq->pfv != NVME_TCP_PFV_1_0) {
857 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
858 return -EPROTO;
859 }
860
861 if (icreq->hpda != 0) {
862 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
863 icreq->hpda);
864 return -EPROTO;
865 }
866
867 queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
868 queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
869 if (queue->hdr_digest || queue->data_digest) {
870 ret = nvmet_tcp_alloc_crypto(queue);
871 if (ret)
872 return ret;
873 }
874
875 memset(icresp, 0, sizeof(*icresp));
876 icresp->hdr.type = nvme_tcp_icresp;
877 icresp->hdr.hlen = sizeof(*icresp);
878 icresp->hdr.pdo = 0;
879 icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
880 icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
881 icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */
882 icresp->cpda = 0;
883 if (queue->hdr_digest)
884 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
885 if (queue->data_digest)
886 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
887
888 iov.iov_base = icresp;
889 iov.iov_len = sizeof(*icresp);
890 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
891 if (ret < 0)
892 goto free_crypto;
893
894 queue->state = NVMET_TCP_Q_LIVE;
895 nvmet_prepare_receive_pdu(queue);
896 return 0;
897 free_crypto:
898 if (queue->hdr_digest || queue->data_digest)
899 nvmet_tcp_free_crypto(queue);
900 return ret;
901 }
902
nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * cmd,struct nvmet_req * req)903 static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
904 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
905 {
906 size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
907 int ret;
908
909 if (!nvme_is_write(cmd->req.cmd) ||
910 data_len > cmd->req.port->inline_data_size) {
911 nvmet_prepare_receive_pdu(queue);
912 return;
913 }
914
915 ret = nvmet_tcp_map_data(cmd);
916 if (unlikely(ret)) {
917 pr_err("queue %d: failed to map data\n", queue->idx);
918 nvmet_tcp_fatal_error(queue);
919 return;
920 }
921
922 queue->rcv_state = NVMET_TCP_RECV_DATA;
923 nvmet_tcp_map_pdu_iovec(cmd);
924 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
925 }
926
nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue * queue)927 static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
928 {
929 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
930 struct nvmet_tcp_cmd *cmd;
931
932 if (likely(queue->nr_cmds))
933 cmd = &queue->cmds[data->ttag];
934 else
935 cmd = &queue->connect;
936
937 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
938 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
939 data->ttag, le32_to_cpu(data->data_offset),
940 cmd->rbytes_done);
941 /* FIXME: use path and transport errors */
942 nvmet_req_complete(&cmd->req,
943 NVME_SC_INVALID_FIELD | NVME_SC_DNR);
944 return -EPROTO;
945 }
946
947 cmd->pdu_len = le32_to_cpu(data->data_length);
948 cmd->pdu_recv = 0;
949 nvmet_tcp_map_pdu_iovec(cmd);
950 queue->cmd = cmd;
951 queue->rcv_state = NVMET_TCP_RECV_DATA;
952
953 return 0;
954 }
955
nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue * queue)956 static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
957 {
958 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
959 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
960 struct nvmet_req *req;
961 int ret;
962
963 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
964 if (hdr->type != nvme_tcp_icreq) {
965 pr_err("unexpected pdu type (%d) before icreq\n",
966 hdr->type);
967 nvmet_tcp_fatal_error(queue);
968 return -EPROTO;
969 }
970 return nvmet_tcp_handle_icreq(queue);
971 }
972
973 if (hdr->type == nvme_tcp_h2c_data) {
974 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
975 if (unlikely(ret))
976 return ret;
977 return 0;
978 }
979
980 queue->cmd = nvmet_tcp_get_cmd(queue);
981 if (unlikely(!queue->cmd)) {
982 /* This should never happen */
983 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
984 queue->idx, queue->nr_cmds, queue->send_list_len,
985 nvme_cmd->common.opcode);
986 nvmet_tcp_fatal_error(queue);
987 return -ENOMEM;
988 }
989
990 req = &queue->cmd->req;
991 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
992
993 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
994 &queue->nvme_sq, &nvmet_tcp_ops))) {
995 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
996 req->cmd, req->cmd->common.command_id,
997 req->cmd->common.opcode,
998 le32_to_cpu(req->cmd->common.dptr.sgl.length));
999
1000 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
1001 return 0;
1002 }
1003
1004 ret = nvmet_tcp_map_data(queue->cmd);
1005 if (unlikely(ret)) {
1006 pr_err("queue %d: failed to map data\n", queue->idx);
1007 if (nvmet_tcp_has_inline_data(queue->cmd))
1008 nvmet_tcp_fatal_error(queue);
1009 else
1010 nvmet_req_complete(req, ret);
1011 ret = -EAGAIN;
1012 goto out;
1013 }
1014
1015 if (nvmet_tcp_need_data_in(queue->cmd)) {
1016 if (nvmet_tcp_has_inline_data(queue->cmd)) {
1017 queue->rcv_state = NVMET_TCP_RECV_DATA;
1018 nvmet_tcp_map_pdu_iovec(queue->cmd);
1019 return 0;
1020 }
1021 /* send back R2T */
1022 nvmet_tcp_queue_response(&queue->cmd->req);
1023 goto out;
1024 }
1025
1026 queue->cmd->req.execute(&queue->cmd->req);
1027 out:
1028 nvmet_prepare_receive_pdu(queue);
1029 return ret;
1030 }
1031
1032 static const u8 nvme_tcp_pdu_sizes[] = {
1033 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
1034 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
1035 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
1036 };
1037
nvmet_tcp_pdu_size(u8 type)1038 static inline u8 nvmet_tcp_pdu_size(u8 type)
1039 {
1040 size_t idx = type;
1041
1042 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
1043 nvme_tcp_pdu_sizes[idx]) ?
1044 nvme_tcp_pdu_sizes[idx] : 0;
1045 }
1046
nvmet_tcp_pdu_valid(u8 type)1047 static inline bool nvmet_tcp_pdu_valid(u8 type)
1048 {
1049 switch (type) {
1050 case nvme_tcp_icreq:
1051 case nvme_tcp_cmd:
1052 case nvme_tcp_h2c_data:
1053 /* fallthru */
1054 return true;
1055 }
1056
1057 return false;
1058 }
1059
nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue * queue)1060 static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
1061 {
1062 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
1063 int len;
1064 struct kvec iov;
1065 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1066
1067 recv:
1068 iov.iov_base = (void *)&queue->pdu + queue->offset;
1069 iov.iov_len = queue->left;
1070 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1071 iov.iov_len, msg.msg_flags);
1072 if (unlikely(len < 0))
1073 return len;
1074
1075 queue->offset += len;
1076 queue->left -= len;
1077 if (queue->left)
1078 return -EAGAIN;
1079
1080 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
1081 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1082
1083 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
1084 pr_err("unexpected pdu type %d\n", hdr->type);
1085 nvmet_tcp_fatal_error(queue);
1086 return -EIO;
1087 }
1088
1089 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
1090 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1091 return -EIO;
1092 }
1093
1094 queue->left = hdr->hlen - queue->offset + hdgst;
1095 goto recv;
1096 }
1097
1098 if (queue->hdr_digest &&
1099 nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) {
1100 nvmet_tcp_fatal_error(queue); /* fatal */
1101 return -EPROTO;
1102 }
1103
1104 if (queue->data_digest &&
1105 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1106 nvmet_tcp_fatal_error(queue); /* fatal */
1107 return -EPROTO;
1108 }
1109
1110 return nvmet_tcp_done_recv_pdu(queue);
1111 }
1112
nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd * cmd)1113 static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1114 {
1115 struct nvmet_tcp_queue *queue = cmd->queue;
1116
1117 nvmet_tcp_recv_ddgst(queue->rcv_hash, cmd);
1118 queue->offset = 0;
1119 queue->left = NVME_TCP_DIGEST_LENGTH;
1120 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1121 }
1122
nvmet_tcp_try_recv_data(struct nvmet_tcp_queue * queue)1123 static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1124 {
1125 struct nvmet_tcp_cmd *cmd = queue->cmd;
1126 int ret;
1127
1128 while (msg_data_left(&cmd->recv_msg)) {
1129 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1130 cmd->recv_msg.msg_flags);
1131 if (ret <= 0)
1132 return ret;
1133
1134 cmd->pdu_recv += ret;
1135 cmd->rbytes_done += ret;
1136 }
1137
1138 nvmet_tcp_unmap_pdu_iovec(cmd);
1139 if (queue->data_digest) {
1140 nvmet_tcp_prep_recv_ddgst(cmd);
1141 return 0;
1142 }
1143
1144 if (cmd->rbytes_done == cmd->req.transfer_len)
1145 nvmet_tcp_execute_request(cmd);
1146
1147 nvmet_prepare_receive_pdu(queue);
1148 return 0;
1149 }
1150
nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue * queue)1151 static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1152 {
1153 struct nvmet_tcp_cmd *cmd = queue->cmd;
1154 int ret;
1155 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1156 struct kvec iov = {
1157 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1158 .iov_len = queue->left
1159 };
1160
1161 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1162 iov.iov_len, msg.msg_flags);
1163 if (unlikely(ret < 0))
1164 return ret;
1165
1166 queue->offset += ret;
1167 queue->left -= ret;
1168 if (queue->left)
1169 return -EAGAIN;
1170
1171 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1172 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1173 queue->idx, cmd->req.cmd->common.command_id,
1174 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1175 le32_to_cpu(cmd->exp_ddgst));
1176 nvmet_tcp_finish_cmd(cmd);
1177 nvmet_tcp_fatal_error(queue);
1178 ret = -EPROTO;
1179 goto out;
1180 }
1181
1182 if (cmd->rbytes_done == cmd->req.transfer_len)
1183 nvmet_tcp_execute_request(cmd);
1184
1185 ret = 0;
1186 out:
1187 nvmet_prepare_receive_pdu(queue);
1188 return ret;
1189 }
1190
nvmet_tcp_try_recv_one(struct nvmet_tcp_queue * queue)1191 static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1192 {
1193 int result = 0;
1194
1195 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1196 return 0;
1197
1198 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1199 result = nvmet_tcp_try_recv_pdu(queue);
1200 if (result != 0)
1201 goto done_recv;
1202 }
1203
1204 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1205 result = nvmet_tcp_try_recv_data(queue);
1206 if (result != 0)
1207 goto done_recv;
1208 }
1209
1210 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1211 result = nvmet_tcp_try_recv_ddgst(queue);
1212 if (result != 0)
1213 goto done_recv;
1214 }
1215
1216 done_recv:
1217 if (result < 0) {
1218 if (result == -EAGAIN)
1219 return 0;
1220 return result;
1221 }
1222 return 1;
1223 }
1224
nvmet_tcp_try_recv(struct nvmet_tcp_queue * queue,int budget,int * recvs)1225 static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1226 int budget, int *recvs)
1227 {
1228 int i, ret = 0;
1229
1230 for (i = 0; i < budget; i++) {
1231 ret = nvmet_tcp_try_recv_one(queue);
1232 if (unlikely(ret < 0)) {
1233 nvmet_tcp_socket_error(queue, ret);
1234 goto done;
1235 } else if (ret == 0) {
1236 break;
1237 }
1238 (*recvs)++;
1239 }
1240 done:
1241 return ret;
1242 }
1243
nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue * queue)1244 static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1245 {
1246 spin_lock(&queue->state_lock);
1247 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1248 queue->state = NVMET_TCP_Q_DISCONNECTING;
1249 schedule_work(&queue->release_work);
1250 }
1251 spin_unlock(&queue->state_lock);
1252 }
1253
nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue * queue)1254 static inline void nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue *queue)
1255 {
1256 queue->poll_end = jiffies + usecs_to_jiffies(idle_poll_period_usecs);
1257 }
1258
nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue * queue,int ops)1259 static bool nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue *queue,
1260 int ops)
1261 {
1262 if (!idle_poll_period_usecs)
1263 return false;
1264
1265 if (ops)
1266 nvmet_tcp_arm_queue_deadline(queue);
1267
1268 return !time_after(jiffies, queue->poll_end);
1269 }
1270
nvmet_tcp_io_work(struct work_struct * w)1271 static void nvmet_tcp_io_work(struct work_struct *w)
1272 {
1273 struct nvmet_tcp_queue *queue =
1274 container_of(w, struct nvmet_tcp_queue, io_work);
1275 bool pending;
1276 int ret, ops = 0;
1277
1278 do {
1279 pending = false;
1280
1281 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1282 if (ret > 0)
1283 pending = true;
1284 else if (ret < 0)
1285 return;
1286
1287 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1288 if (ret > 0)
1289 pending = true;
1290 else if (ret < 0)
1291 return;
1292
1293 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1294
1295 /*
1296 * Requeue the worker if idle deadline period is in progress or any
1297 * ops activity was recorded during the do-while loop above.
1298 */
1299 if (nvmet_tcp_check_queue_deadline(queue, ops) || pending)
1300 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1301 }
1302
nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * c)1303 static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1304 struct nvmet_tcp_cmd *c)
1305 {
1306 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1307
1308 c->queue = queue;
1309 c->req.port = queue->port->nport;
1310
1311 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1312 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1313 if (!c->cmd_pdu)
1314 return -ENOMEM;
1315 c->req.cmd = &c->cmd_pdu->cmd;
1316
1317 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1318 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1319 if (!c->rsp_pdu)
1320 goto out_free_cmd;
1321 c->req.cqe = &c->rsp_pdu->cqe;
1322
1323 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1324 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1325 if (!c->data_pdu)
1326 goto out_free_rsp;
1327
1328 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1329 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1330 if (!c->r2t_pdu)
1331 goto out_free_data;
1332
1333 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1334
1335 list_add_tail(&c->entry, &queue->free_list);
1336
1337 return 0;
1338 out_free_data:
1339 page_frag_free(c->data_pdu);
1340 out_free_rsp:
1341 page_frag_free(c->rsp_pdu);
1342 out_free_cmd:
1343 page_frag_free(c->cmd_pdu);
1344 return -ENOMEM;
1345 }
1346
nvmet_tcp_free_cmd(struct nvmet_tcp_cmd * c)1347 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1348 {
1349 page_frag_free(c->r2t_pdu);
1350 page_frag_free(c->data_pdu);
1351 page_frag_free(c->rsp_pdu);
1352 page_frag_free(c->cmd_pdu);
1353 }
1354
nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue * queue)1355 static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1356 {
1357 struct nvmet_tcp_cmd *cmds;
1358 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1359
1360 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1361 if (!cmds)
1362 goto out;
1363
1364 for (i = 0; i < nr_cmds; i++) {
1365 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1366 if (ret)
1367 goto out_free;
1368 }
1369
1370 queue->cmds = cmds;
1371
1372 return 0;
1373 out_free:
1374 while (--i >= 0)
1375 nvmet_tcp_free_cmd(cmds + i);
1376 kfree(cmds);
1377 out:
1378 return ret;
1379 }
1380
nvmet_tcp_free_cmds(struct nvmet_tcp_queue * queue)1381 static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1382 {
1383 struct nvmet_tcp_cmd *cmds = queue->cmds;
1384 int i;
1385
1386 for (i = 0; i < queue->nr_cmds; i++)
1387 nvmet_tcp_free_cmd(cmds + i);
1388
1389 nvmet_tcp_free_cmd(&queue->connect);
1390 kfree(cmds);
1391 }
1392
nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue * queue)1393 static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1394 {
1395 struct socket *sock = queue->sock;
1396
1397 write_lock_bh(&sock->sk->sk_callback_lock);
1398 sock->sk->sk_data_ready = queue->data_ready;
1399 sock->sk->sk_state_change = queue->state_change;
1400 sock->sk->sk_write_space = queue->write_space;
1401 sock->sk->sk_user_data = NULL;
1402 write_unlock_bh(&sock->sk->sk_callback_lock);
1403 }
1404
nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd * cmd)1405 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1406 {
1407 nvmet_req_uninit(&cmd->req);
1408 nvmet_tcp_unmap_pdu_iovec(cmd);
1409 kfree(cmd->iov);
1410 sgl_free(cmd->req.sg);
1411 }
1412
nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue * queue)1413 static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1414 {
1415 struct nvmet_tcp_cmd *cmd = queue->cmds;
1416 int i;
1417
1418 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1419 if (nvmet_tcp_need_data_in(cmd))
1420 nvmet_tcp_finish_cmd(cmd);
1421 }
1422
1423 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1424 /* failed in connect */
1425 nvmet_tcp_finish_cmd(&queue->connect);
1426 }
1427 }
1428
nvmet_tcp_release_queue_work(struct work_struct * w)1429 static void nvmet_tcp_release_queue_work(struct work_struct *w)
1430 {
1431 struct nvmet_tcp_queue *queue =
1432 container_of(w, struct nvmet_tcp_queue, release_work);
1433
1434 mutex_lock(&nvmet_tcp_queue_mutex);
1435 list_del_init(&queue->queue_list);
1436 mutex_unlock(&nvmet_tcp_queue_mutex);
1437
1438 nvmet_tcp_restore_socket_callbacks(queue);
1439 flush_work(&queue->io_work);
1440
1441 nvmet_tcp_uninit_data_in_cmds(queue);
1442 nvmet_sq_destroy(&queue->nvme_sq);
1443 cancel_work_sync(&queue->io_work);
1444 sock_release(queue->sock);
1445 nvmet_tcp_free_cmds(queue);
1446 if (queue->hdr_digest || queue->data_digest)
1447 nvmet_tcp_free_crypto(queue);
1448 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1449
1450 kfree(queue);
1451 }
1452
nvmet_tcp_data_ready(struct sock * sk)1453 static void nvmet_tcp_data_ready(struct sock *sk)
1454 {
1455 struct nvmet_tcp_queue *queue;
1456
1457 read_lock_bh(&sk->sk_callback_lock);
1458 queue = sk->sk_user_data;
1459 if (likely(queue))
1460 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1461 read_unlock_bh(&sk->sk_callback_lock);
1462 }
1463
nvmet_tcp_write_space(struct sock * sk)1464 static void nvmet_tcp_write_space(struct sock *sk)
1465 {
1466 struct nvmet_tcp_queue *queue;
1467
1468 read_lock_bh(&sk->sk_callback_lock);
1469 queue = sk->sk_user_data;
1470 if (unlikely(!queue))
1471 goto out;
1472
1473 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1474 queue->write_space(sk);
1475 goto out;
1476 }
1477
1478 if (sk_stream_is_writeable(sk)) {
1479 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1480 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1481 }
1482 out:
1483 read_unlock_bh(&sk->sk_callback_lock);
1484 }
1485
nvmet_tcp_state_change(struct sock * sk)1486 static void nvmet_tcp_state_change(struct sock *sk)
1487 {
1488 struct nvmet_tcp_queue *queue;
1489
1490 read_lock_bh(&sk->sk_callback_lock);
1491 queue = sk->sk_user_data;
1492 if (!queue)
1493 goto done;
1494
1495 switch (sk->sk_state) {
1496 case TCP_FIN_WAIT1:
1497 case TCP_CLOSE_WAIT:
1498 case TCP_CLOSE:
1499 /* FALLTHRU */
1500 sk->sk_user_data = NULL;
1501 nvmet_tcp_schedule_release_queue(queue);
1502 break;
1503 default:
1504 pr_warn("queue %d unhandled state %d\n",
1505 queue->idx, sk->sk_state);
1506 }
1507 done:
1508 read_unlock_bh(&sk->sk_callback_lock);
1509 }
1510
nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue * queue)1511 static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1512 {
1513 struct socket *sock = queue->sock;
1514 struct inet_sock *inet = inet_sk(sock->sk);
1515 int ret;
1516
1517 ret = kernel_getsockname(sock,
1518 (struct sockaddr *)&queue->sockaddr);
1519 if (ret < 0)
1520 return ret;
1521
1522 ret = kernel_getpeername(sock,
1523 (struct sockaddr *)&queue->sockaddr_peer);
1524 if (ret < 0)
1525 return ret;
1526
1527 /*
1528 * Cleanup whatever is sitting in the TCP transmit queue on socket
1529 * close. This is done to prevent stale data from being sent should
1530 * the network connection be restored before TCP times out.
1531 */
1532 sock_no_linger(sock->sk);
1533
1534 if (so_priority > 0)
1535 sock_set_priority(sock->sk, so_priority);
1536
1537 /* Set socket type of service */
1538 if (inet->rcv_tos > 0)
1539 ip_sock_set_tos(sock->sk, inet->rcv_tos);
1540
1541 ret = 0;
1542 write_lock_bh(&sock->sk->sk_callback_lock);
1543 if (sock->sk->sk_state != TCP_ESTABLISHED) {
1544 /*
1545 * If the socket is already closing, don't even start
1546 * consuming it
1547 */
1548 ret = -ENOTCONN;
1549 } else {
1550 sock->sk->sk_user_data = queue;
1551 queue->data_ready = sock->sk->sk_data_ready;
1552 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1553 queue->state_change = sock->sk->sk_state_change;
1554 sock->sk->sk_state_change = nvmet_tcp_state_change;
1555 queue->write_space = sock->sk->sk_write_space;
1556 sock->sk->sk_write_space = nvmet_tcp_write_space;
1557 if (idle_poll_period_usecs)
1558 nvmet_tcp_arm_queue_deadline(queue);
1559 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1560 }
1561 write_unlock_bh(&sock->sk->sk_callback_lock);
1562
1563 return ret;
1564 }
1565
nvmet_tcp_alloc_queue(struct nvmet_tcp_port * port,struct socket * newsock)1566 static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1567 struct socket *newsock)
1568 {
1569 struct nvmet_tcp_queue *queue;
1570 int ret;
1571
1572 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1573 if (!queue)
1574 return -ENOMEM;
1575
1576 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1577 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1578 queue->sock = newsock;
1579 queue->port = port;
1580 queue->nr_cmds = 0;
1581 spin_lock_init(&queue->state_lock);
1582 queue->state = NVMET_TCP_Q_CONNECTING;
1583 INIT_LIST_HEAD(&queue->free_list);
1584 init_llist_head(&queue->resp_list);
1585 INIT_LIST_HEAD(&queue->resp_send_list);
1586
1587 queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL);
1588 if (queue->idx < 0) {
1589 ret = queue->idx;
1590 goto out_free_queue;
1591 }
1592
1593 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1594 if (ret)
1595 goto out_ida_remove;
1596
1597 ret = nvmet_sq_init(&queue->nvme_sq);
1598 if (ret)
1599 goto out_free_connect;
1600
1601 nvmet_prepare_receive_pdu(queue);
1602
1603 mutex_lock(&nvmet_tcp_queue_mutex);
1604 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1605 mutex_unlock(&nvmet_tcp_queue_mutex);
1606
1607 ret = nvmet_tcp_set_queue_sock(queue);
1608 if (ret)
1609 goto out_destroy_sq;
1610
1611 return 0;
1612 out_destroy_sq:
1613 mutex_lock(&nvmet_tcp_queue_mutex);
1614 list_del_init(&queue->queue_list);
1615 mutex_unlock(&nvmet_tcp_queue_mutex);
1616 nvmet_sq_destroy(&queue->nvme_sq);
1617 out_free_connect:
1618 nvmet_tcp_free_cmd(&queue->connect);
1619 out_ida_remove:
1620 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1621 out_free_queue:
1622 kfree(queue);
1623 return ret;
1624 }
1625
nvmet_tcp_accept_work(struct work_struct * w)1626 static void nvmet_tcp_accept_work(struct work_struct *w)
1627 {
1628 struct nvmet_tcp_port *port =
1629 container_of(w, struct nvmet_tcp_port, accept_work);
1630 struct socket *newsock;
1631 int ret;
1632
1633 while (true) {
1634 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1635 if (ret < 0) {
1636 if (ret != -EAGAIN)
1637 pr_warn("failed to accept err=%d\n", ret);
1638 return;
1639 }
1640 ret = nvmet_tcp_alloc_queue(port, newsock);
1641 if (ret) {
1642 pr_err("failed to allocate queue\n");
1643 sock_release(newsock);
1644 }
1645 }
1646 }
1647
nvmet_tcp_listen_data_ready(struct sock * sk)1648 static void nvmet_tcp_listen_data_ready(struct sock *sk)
1649 {
1650 struct nvmet_tcp_port *port;
1651
1652 read_lock_bh(&sk->sk_callback_lock);
1653 port = sk->sk_user_data;
1654 if (!port)
1655 goto out;
1656
1657 if (sk->sk_state == TCP_LISTEN)
1658 schedule_work(&port->accept_work);
1659 out:
1660 read_unlock_bh(&sk->sk_callback_lock);
1661 }
1662
nvmet_tcp_add_port(struct nvmet_port * nport)1663 static int nvmet_tcp_add_port(struct nvmet_port *nport)
1664 {
1665 struct nvmet_tcp_port *port;
1666 __kernel_sa_family_t af;
1667 int ret;
1668
1669 port = kzalloc(sizeof(*port), GFP_KERNEL);
1670 if (!port)
1671 return -ENOMEM;
1672
1673 switch (nport->disc_addr.adrfam) {
1674 case NVMF_ADDR_FAMILY_IP4:
1675 af = AF_INET;
1676 break;
1677 case NVMF_ADDR_FAMILY_IP6:
1678 af = AF_INET6;
1679 break;
1680 default:
1681 pr_err("address family %d not supported\n",
1682 nport->disc_addr.adrfam);
1683 ret = -EINVAL;
1684 goto err_port;
1685 }
1686
1687 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1688 nport->disc_addr.trsvcid, &port->addr);
1689 if (ret) {
1690 pr_err("malformed ip/port passed: %s:%s\n",
1691 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1692 goto err_port;
1693 }
1694
1695 port->nport = nport;
1696 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1697 if (port->nport->inline_data_size < 0)
1698 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1699
1700 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1701 IPPROTO_TCP, &port->sock);
1702 if (ret) {
1703 pr_err("failed to create a socket\n");
1704 goto err_port;
1705 }
1706
1707 port->sock->sk->sk_user_data = port;
1708 port->data_ready = port->sock->sk->sk_data_ready;
1709 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1710 sock_set_reuseaddr(port->sock->sk);
1711 tcp_sock_set_nodelay(port->sock->sk);
1712 if (so_priority > 0)
1713 sock_set_priority(port->sock->sk, so_priority);
1714
1715 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1716 sizeof(port->addr));
1717 if (ret) {
1718 pr_err("failed to bind port socket %d\n", ret);
1719 goto err_sock;
1720 }
1721
1722 ret = kernel_listen(port->sock, 128);
1723 if (ret) {
1724 pr_err("failed to listen %d on port sock\n", ret);
1725 goto err_sock;
1726 }
1727
1728 nport->priv = port;
1729 pr_info("enabling port %d (%pISpc)\n",
1730 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1731
1732 return 0;
1733
1734 err_sock:
1735 sock_release(port->sock);
1736 err_port:
1737 kfree(port);
1738 return ret;
1739 }
1740
nvmet_tcp_remove_port(struct nvmet_port * nport)1741 static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1742 {
1743 struct nvmet_tcp_port *port = nport->priv;
1744
1745 write_lock_bh(&port->sock->sk->sk_callback_lock);
1746 port->sock->sk->sk_data_ready = port->data_ready;
1747 port->sock->sk->sk_user_data = NULL;
1748 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1749 cancel_work_sync(&port->accept_work);
1750
1751 sock_release(port->sock);
1752 kfree(port);
1753 }
1754
nvmet_tcp_delete_ctrl(struct nvmet_ctrl * ctrl)1755 static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1756 {
1757 struct nvmet_tcp_queue *queue;
1758
1759 mutex_lock(&nvmet_tcp_queue_mutex);
1760 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1761 if (queue->nvme_sq.ctrl == ctrl)
1762 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1763 mutex_unlock(&nvmet_tcp_queue_mutex);
1764 }
1765
nvmet_tcp_install_queue(struct nvmet_sq * sq)1766 static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1767 {
1768 struct nvmet_tcp_queue *queue =
1769 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1770
1771 if (sq->qid == 0) {
1772 /* Let inflight controller teardown complete */
1773 flush_scheduled_work();
1774 }
1775
1776 queue->nr_cmds = sq->size * 2;
1777 if (nvmet_tcp_alloc_cmds(queue))
1778 return NVME_SC_INTERNAL;
1779 return 0;
1780 }
1781
nvmet_tcp_disc_port_addr(struct nvmet_req * req,struct nvmet_port * nport,char * traddr)1782 static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1783 struct nvmet_port *nport, char *traddr)
1784 {
1785 struct nvmet_tcp_port *port = nport->priv;
1786
1787 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1788 struct nvmet_tcp_cmd *cmd =
1789 container_of(req, struct nvmet_tcp_cmd, req);
1790 struct nvmet_tcp_queue *queue = cmd->queue;
1791
1792 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1793 } else {
1794 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1795 }
1796 }
1797
1798 static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
1799 .owner = THIS_MODULE,
1800 .type = NVMF_TRTYPE_TCP,
1801 .msdbd = 1,
1802 .add_port = nvmet_tcp_add_port,
1803 .remove_port = nvmet_tcp_remove_port,
1804 .queue_response = nvmet_tcp_queue_response,
1805 .delete_ctrl = nvmet_tcp_delete_ctrl,
1806 .install_queue = nvmet_tcp_install_queue,
1807 .disc_traddr = nvmet_tcp_disc_port_addr,
1808 };
1809
nvmet_tcp_init(void)1810 static int __init nvmet_tcp_init(void)
1811 {
1812 int ret;
1813
1814 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1815 if (!nvmet_tcp_wq)
1816 return -ENOMEM;
1817
1818 ret = nvmet_register_transport(&nvmet_tcp_ops);
1819 if (ret)
1820 goto err;
1821
1822 return 0;
1823 err:
1824 destroy_workqueue(nvmet_tcp_wq);
1825 return ret;
1826 }
1827
nvmet_tcp_exit(void)1828 static void __exit nvmet_tcp_exit(void)
1829 {
1830 struct nvmet_tcp_queue *queue;
1831
1832 nvmet_unregister_transport(&nvmet_tcp_ops);
1833
1834 flush_scheduled_work();
1835 mutex_lock(&nvmet_tcp_queue_mutex);
1836 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1837 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1838 mutex_unlock(&nvmet_tcp_queue_mutex);
1839 flush_scheduled_work();
1840
1841 destroy_workqueue(nvmet_tcp_wq);
1842 }
1843
1844 module_init(nvmet_tcp_init);
1845 module_exit(nvmet_tcp_exit);
1846
1847 MODULE_LICENSE("GPL v2");
1848 MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
1849