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/key.h> |
12 | #include <linux/nvme-tcp.h> |
13 | #include <linux/nvme-keyring.h> |
14 | #include <net/sock.h> |
15 | #include <net/tcp.h> |
16 | #include <net/tls.h> |
17 | #include <net/tls_prot.h> |
18 | #include <net/handshake.h> |
19 | #include <linux/inet.h> |
20 | #include <linux/llist.h> |
21 | #include <crypto/hash.h> |
22 | #include <trace/events/sock.h> |
23 | |
24 | #include "nvmet.h" |
25 | |
26 | #define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE) |
27 | |
28 | static int param_store_val(const char *str, int *val, int min, int max) |
29 | { |
30 | int ret, new_val; |
31 | |
32 | ret = kstrtoint(s: str, base: 10, res: &new_val); |
33 | if (ret) |
34 | return -EINVAL; |
35 | |
36 | if (new_val < min || new_val > max) |
37 | return -EINVAL; |
38 | |
39 | *val = new_val; |
40 | return 0; |
41 | } |
42 | |
43 | static int set_params(const char *str, const struct kernel_param *kp) |
44 | { |
45 | return param_store_val(str, val: kp->arg, min: 0, INT_MAX); |
46 | } |
47 | |
48 | static const struct kernel_param_ops set_param_ops = { |
49 | .set = set_params, |
50 | .get = param_get_int, |
51 | }; |
52 | |
53 | /* Define the socket priority to use for connections were it is desirable |
54 | * that the NIC consider performing optimized packet processing or filtering. |
55 | * A non-zero value being sufficient to indicate general consideration of any |
56 | * possible optimization. Making it a module param allows for alternative |
57 | * values that may be unique for some NIC implementations. |
58 | */ |
59 | static int so_priority; |
60 | device_param_cb(so_priority, &set_param_ops, &so_priority, 0644); |
61 | MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority: Default 0" ); |
62 | |
63 | /* Define a time period (in usecs) that io_work() shall sample an activated |
64 | * queue before determining it to be idle. This optional module behavior |
65 | * can enable NIC solutions that support socket optimized packet processing |
66 | * using advanced interrupt moderation techniques. |
67 | */ |
68 | static int idle_poll_period_usecs; |
69 | device_param_cb(idle_poll_period_usecs, &set_param_ops, |
70 | &idle_poll_period_usecs, 0644); |
71 | MODULE_PARM_DESC(idle_poll_period_usecs, |
72 | "nvmet tcp io_work poll till idle time period in usecs: Default 0" ); |
73 | |
74 | #ifdef CONFIG_NVME_TARGET_TCP_TLS |
75 | /* |
76 | * TLS handshake timeout |
77 | */ |
78 | static int tls_handshake_timeout = 10; |
79 | module_param(tls_handshake_timeout, int, 0644); |
80 | MODULE_PARM_DESC(tls_handshake_timeout, |
81 | "nvme TLS handshake timeout in seconds (default 10)" ); |
82 | #endif |
83 | |
84 | #define NVMET_TCP_RECV_BUDGET 8 |
85 | #define NVMET_TCP_SEND_BUDGET 8 |
86 | #define NVMET_TCP_IO_WORK_BUDGET 64 |
87 | |
88 | enum nvmet_tcp_send_state { |
89 | NVMET_TCP_SEND_DATA_PDU, |
90 | NVMET_TCP_SEND_DATA, |
91 | NVMET_TCP_SEND_R2T, |
92 | NVMET_TCP_SEND_DDGST, |
93 | NVMET_TCP_SEND_RESPONSE |
94 | }; |
95 | |
96 | enum nvmet_tcp_recv_state { |
97 | NVMET_TCP_RECV_PDU, |
98 | NVMET_TCP_RECV_DATA, |
99 | NVMET_TCP_RECV_DDGST, |
100 | NVMET_TCP_RECV_ERR, |
101 | }; |
102 | |
103 | enum { |
104 | NVMET_TCP_F_INIT_FAILED = (1 << 0), |
105 | }; |
106 | |
107 | struct nvmet_tcp_cmd { |
108 | struct nvmet_tcp_queue *queue; |
109 | struct nvmet_req req; |
110 | |
111 | struct nvme_tcp_cmd_pdu *cmd_pdu; |
112 | struct nvme_tcp_rsp_pdu *rsp_pdu; |
113 | struct nvme_tcp_data_pdu *data_pdu; |
114 | struct nvme_tcp_r2t_pdu *r2t_pdu; |
115 | |
116 | u32 rbytes_done; |
117 | u32 wbytes_done; |
118 | |
119 | u32 pdu_len; |
120 | u32 pdu_recv; |
121 | int sg_idx; |
122 | char recv_cbuf[CMSG_LEN(sizeof(char))]; |
123 | struct msghdr recv_msg; |
124 | struct bio_vec *iov; |
125 | u32 flags; |
126 | |
127 | struct list_head entry; |
128 | struct llist_node lentry; |
129 | |
130 | /* send state */ |
131 | u32 offset; |
132 | struct scatterlist *cur_sg; |
133 | enum nvmet_tcp_send_state state; |
134 | |
135 | __le32 exp_ddgst; |
136 | __le32 recv_ddgst; |
137 | }; |
138 | |
139 | enum nvmet_tcp_queue_state { |
140 | NVMET_TCP_Q_CONNECTING, |
141 | NVMET_TCP_Q_TLS_HANDSHAKE, |
142 | NVMET_TCP_Q_LIVE, |
143 | NVMET_TCP_Q_DISCONNECTING, |
144 | NVMET_TCP_Q_FAILED, |
145 | }; |
146 | |
147 | struct nvmet_tcp_queue { |
148 | struct socket *sock; |
149 | struct nvmet_tcp_port *port; |
150 | struct work_struct io_work; |
151 | struct nvmet_cq nvme_cq; |
152 | struct nvmet_sq nvme_sq; |
153 | struct kref kref; |
154 | |
155 | /* send state */ |
156 | struct nvmet_tcp_cmd *cmds; |
157 | unsigned int nr_cmds; |
158 | struct list_head free_list; |
159 | struct llist_head resp_list; |
160 | struct list_head resp_send_list; |
161 | int send_list_len; |
162 | struct nvmet_tcp_cmd *snd_cmd; |
163 | |
164 | /* recv state */ |
165 | int offset; |
166 | int left; |
167 | enum nvmet_tcp_recv_state rcv_state; |
168 | struct nvmet_tcp_cmd *cmd; |
169 | union nvme_tcp_pdu pdu; |
170 | |
171 | /* digest state */ |
172 | bool hdr_digest; |
173 | bool data_digest; |
174 | struct ahash_request *snd_hash; |
175 | struct ahash_request *rcv_hash; |
176 | |
177 | /* TLS state */ |
178 | key_serial_t tls_pskid; |
179 | struct delayed_work tls_handshake_tmo_work; |
180 | |
181 | unsigned long poll_end; |
182 | |
183 | spinlock_t state_lock; |
184 | enum nvmet_tcp_queue_state state; |
185 | |
186 | struct sockaddr_storage sockaddr; |
187 | struct sockaddr_storage sockaddr_peer; |
188 | struct work_struct release_work; |
189 | |
190 | int idx; |
191 | struct list_head queue_list; |
192 | |
193 | struct nvmet_tcp_cmd connect; |
194 | |
195 | struct page_frag_cache pf_cache; |
196 | |
197 | void (*data_ready)(struct sock *); |
198 | void (*state_change)(struct sock *); |
199 | void (*write_space)(struct sock *); |
200 | }; |
201 | |
202 | struct nvmet_tcp_port { |
203 | struct socket *sock; |
204 | struct work_struct accept_work; |
205 | struct nvmet_port *nport; |
206 | struct sockaddr_storage addr; |
207 | void (*data_ready)(struct sock *); |
208 | }; |
209 | |
210 | static DEFINE_IDA(nvmet_tcp_queue_ida); |
211 | static LIST_HEAD(nvmet_tcp_queue_list); |
212 | static DEFINE_MUTEX(nvmet_tcp_queue_mutex); |
213 | |
214 | static struct workqueue_struct *nvmet_tcp_wq; |
215 | static const struct nvmet_fabrics_ops nvmet_tcp_ops; |
216 | static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c); |
217 | static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd); |
218 | |
219 | static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue, |
220 | struct nvmet_tcp_cmd *cmd) |
221 | { |
222 | if (unlikely(!queue->nr_cmds)) { |
223 | /* We didn't allocate cmds yet, send 0xffff */ |
224 | return USHRT_MAX; |
225 | } |
226 | |
227 | return cmd - queue->cmds; |
228 | } |
229 | |
230 | static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd) |
231 | { |
232 | return nvme_is_write(cmd: cmd->req.cmd) && |
233 | cmd->rbytes_done < cmd->req.transfer_len; |
234 | } |
235 | |
236 | static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd) |
237 | { |
238 | return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status; |
239 | } |
240 | |
241 | static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd) |
242 | { |
243 | return !nvme_is_write(cmd: cmd->req.cmd) && |
244 | cmd->req.transfer_len > 0 && |
245 | !cmd->req.cqe->status; |
246 | } |
247 | |
248 | static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd) |
249 | { |
250 | return nvme_is_write(cmd: cmd->req.cmd) && cmd->pdu_len && |
251 | !cmd->rbytes_done; |
252 | } |
253 | |
254 | static inline struct nvmet_tcp_cmd * |
255 | nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue) |
256 | { |
257 | struct nvmet_tcp_cmd *cmd; |
258 | |
259 | cmd = list_first_entry_or_null(&queue->free_list, |
260 | struct nvmet_tcp_cmd, entry); |
261 | if (!cmd) |
262 | return NULL; |
263 | list_del_init(entry: &cmd->entry); |
264 | |
265 | cmd->rbytes_done = cmd->wbytes_done = 0; |
266 | cmd->pdu_len = 0; |
267 | cmd->pdu_recv = 0; |
268 | cmd->iov = NULL; |
269 | cmd->flags = 0; |
270 | return cmd; |
271 | } |
272 | |
273 | static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd) |
274 | { |
275 | if (unlikely(cmd == &cmd->queue->connect)) |
276 | return; |
277 | |
278 | list_add_tail(new: &cmd->entry, head: &cmd->queue->free_list); |
279 | } |
280 | |
281 | static inline int queue_cpu(struct nvmet_tcp_queue *queue) |
282 | { |
283 | return queue->sock->sk->sk_incoming_cpu; |
284 | } |
285 | |
286 | static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue) |
287 | { |
288 | return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0; |
289 | } |
290 | |
291 | static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue) |
292 | { |
293 | return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0; |
294 | } |
295 | |
296 | static inline void nvmet_tcp_hdgst(struct ahash_request *hash, |
297 | void *pdu, size_t len) |
298 | { |
299 | struct scatterlist sg; |
300 | |
301 | sg_init_one(&sg, pdu, len); |
302 | ahash_request_set_crypt(req: hash, src: &sg, result: pdu + len, nbytes: len); |
303 | crypto_ahash_digest(req: hash); |
304 | } |
305 | |
306 | static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue, |
307 | void *pdu, size_t len) |
308 | { |
309 | struct nvme_tcp_hdr *hdr = pdu; |
310 | __le32 recv_digest; |
311 | __le32 exp_digest; |
312 | |
313 | if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) { |
314 | pr_err("queue %d: header digest enabled but no header digest\n" , |
315 | queue->idx); |
316 | return -EPROTO; |
317 | } |
318 | |
319 | recv_digest = *(__le32 *)(pdu + hdr->hlen); |
320 | nvmet_tcp_hdgst(hash: queue->rcv_hash, pdu, len); |
321 | exp_digest = *(__le32 *)(pdu + hdr->hlen); |
322 | if (recv_digest != exp_digest) { |
323 | pr_err("queue %d: header digest error: recv %#x expected %#x\n" , |
324 | queue->idx, le32_to_cpu(recv_digest), |
325 | le32_to_cpu(exp_digest)); |
326 | return -EPROTO; |
327 | } |
328 | |
329 | return 0; |
330 | } |
331 | |
332 | static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu) |
333 | { |
334 | struct nvme_tcp_hdr *hdr = pdu; |
335 | u8 digest_len = nvmet_tcp_hdgst_len(queue); |
336 | u32 len; |
337 | |
338 | len = le32_to_cpu(hdr->plen) - hdr->hlen - |
339 | (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0); |
340 | |
341 | if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) { |
342 | pr_err("queue %d: data digest flag is cleared\n" , queue->idx); |
343 | return -EPROTO; |
344 | } |
345 | |
346 | return 0; |
347 | } |
348 | |
349 | static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd) |
350 | { |
351 | kfree(objp: cmd->iov); |
352 | sgl_free(sgl: cmd->req.sg); |
353 | cmd->iov = NULL; |
354 | cmd->req.sg = NULL; |
355 | } |
356 | |
357 | static void nvmet_tcp_build_pdu_iovec(struct nvmet_tcp_cmd *cmd) |
358 | { |
359 | struct bio_vec *iov = cmd->iov; |
360 | struct scatterlist *sg; |
361 | u32 length, offset, sg_offset; |
362 | int nr_pages; |
363 | |
364 | length = cmd->pdu_len; |
365 | nr_pages = DIV_ROUND_UP(length, PAGE_SIZE); |
366 | offset = cmd->rbytes_done; |
367 | cmd->sg_idx = offset / PAGE_SIZE; |
368 | sg_offset = offset % PAGE_SIZE; |
369 | sg = &cmd->req.sg[cmd->sg_idx]; |
370 | |
371 | while (length) { |
372 | u32 iov_len = min_t(u32, length, sg->length - sg_offset); |
373 | |
374 | bvec_set_page(bv: iov, page: sg_page(sg), len: iov_len, |
375 | offset: sg->offset + sg_offset); |
376 | |
377 | length -= iov_len; |
378 | sg = sg_next(sg); |
379 | iov++; |
380 | sg_offset = 0; |
381 | } |
382 | |
383 | iov_iter_bvec(i: &cmd->recv_msg.msg_iter, ITER_DEST, bvec: cmd->iov, |
384 | nr_segs: nr_pages, count: cmd->pdu_len); |
385 | } |
386 | |
387 | static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue) |
388 | { |
389 | queue->rcv_state = NVMET_TCP_RECV_ERR; |
390 | if (queue->nvme_sq.ctrl) |
391 | nvmet_ctrl_fatal_error(ctrl: queue->nvme_sq.ctrl); |
392 | else |
393 | kernel_sock_shutdown(sock: queue->sock, how: SHUT_RDWR); |
394 | } |
395 | |
396 | static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status) |
397 | { |
398 | queue->rcv_state = NVMET_TCP_RECV_ERR; |
399 | if (status == -EPIPE || status == -ECONNRESET) |
400 | kernel_sock_shutdown(sock: queue->sock, how: SHUT_RDWR); |
401 | else |
402 | nvmet_tcp_fatal_error(queue); |
403 | } |
404 | |
405 | static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd) |
406 | { |
407 | struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl; |
408 | u32 len = le32_to_cpu(sgl->length); |
409 | |
410 | if (!len) |
411 | return 0; |
412 | |
413 | if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) | |
414 | NVME_SGL_FMT_OFFSET)) { |
415 | if (!nvme_is_write(cmd: cmd->req.cmd)) |
416 | return NVME_SC_INVALID_FIELD | NVME_SC_DNR; |
417 | |
418 | if (len > cmd->req.port->inline_data_size) |
419 | return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR; |
420 | cmd->pdu_len = len; |
421 | } |
422 | cmd->req.transfer_len += len; |
423 | |
424 | cmd->req.sg = sgl_alloc(length: len, GFP_KERNEL, nent_p: &cmd->req.sg_cnt); |
425 | if (!cmd->req.sg) |
426 | return NVME_SC_INTERNAL; |
427 | cmd->cur_sg = cmd->req.sg; |
428 | |
429 | if (nvmet_tcp_has_data_in(cmd)) { |
430 | cmd->iov = kmalloc_array(n: cmd->req.sg_cnt, |
431 | size: sizeof(*cmd->iov), GFP_KERNEL); |
432 | if (!cmd->iov) |
433 | goto err; |
434 | } |
435 | |
436 | return 0; |
437 | err: |
438 | nvmet_tcp_free_cmd_buffers(cmd); |
439 | return NVME_SC_INTERNAL; |
440 | } |
441 | |
442 | static void nvmet_tcp_calc_ddgst(struct ahash_request *hash, |
443 | struct nvmet_tcp_cmd *cmd) |
444 | { |
445 | ahash_request_set_crypt(req: hash, src: cmd->req.sg, |
446 | result: (void *)&cmd->exp_ddgst, nbytes: cmd->req.transfer_len); |
447 | crypto_ahash_digest(req: hash); |
448 | } |
449 | |
450 | static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd) |
451 | { |
452 | struct nvme_tcp_data_pdu *pdu = cmd->data_pdu; |
453 | struct nvmet_tcp_queue *queue = cmd->queue; |
454 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
455 | u8 ddgst = nvmet_tcp_ddgst_len(queue: cmd->queue); |
456 | |
457 | cmd->offset = 0; |
458 | cmd->state = NVMET_TCP_SEND_DATA_PDU; |
459 | |
460 | pdu->hdr.type = nvme_tcp_c2h_data; |
461 | pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ? |
462 | NVME_TCP_F_DATA_SUCCESS : 0); |
463 | pdu->hdr.hlen = sizeof(*pdu); |
464 | pdu->hdr.pdo = pdu->hdr.hlen + hdgst; |
465 | pdu->hdr.plen = |
466 | cpu_to_le32(pdu->hdr.hlen + hdgst + |
467 | cmd->req.transfer_len + ddgst); |
468 | pdu->command_id = cmd->req.cqe->command_id; |
469 | pdu->data_length = cpu_to_le32(cmd->req.transfer_len); |
470 | pdu->data_offset = cpu_to_le32(cmd->wbytes_done); |
471 | |
472 | if (queue->data_digest) { |
473 | pdu->hdr.flags |= NVME_TCP_F_DDGST; |
474 | nvmet_tcp_calc_ddgst(hash: queue->snd_hash, cmd); |
475 | } |
476 | |
477 | if (cmd->queue->hdr_digest) { |
478 | pdu->hdr.flags |= NVME_TCP_F_HDGST; |
479 | nvmet_tcp_hdgst(hash: queue->snd_hash, pdu, len: sizeof(*pdu)); |
480 | } |
481 | } |
482 | |
483 | static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd) |
484 | { |
485 | struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu; |
486 | struct nvmet_tcp_queue *queue = cmd->queue; |
487 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
488 | |
489 | cmd->offset = 0; |
490 | cmd->state = NVMET_TCP_SEND_R2T; |
491 | |
492 | pdu->hdr.type = nvme_tcp_r2t; |
493 | pdu->hdr.flags = 0; |
494 | pdu->hdr.hlen = sizeof(*pdu); |
495 | pdu->hdr.pdo = 0; |
496 | pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst); |
497 | |
498 | pdu->command_id = cmd->req.cmd->common.command_id; |
499 | pdu->ttag = nvmet_tcp_cmd_tag(queue: cmd->queue, cmd); |
500 | pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done); |
501 | pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done); |
502 | if (cmd->queue->hdr_digest) { |
503 | pdu->hdr.flags |= NVME_TCP_F_HDGST; |
504 | nvmet_tcp_hdgst(hash: queue->snd_hash, pdu, len: sizeof(*pdu)); |
505 | } |
506 | } |
507 | |
508 | static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd) |
509 | { |
510 | struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu; |
511 | struct nvmet_tcp_queue *queue = cmd->queue; |
512 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
513 | |
514 | cmd->offset = 0; |
515 | cmd->state = NVMET_TCP_SEND_RESPONSE; |
516 | |
517 | pdu->hdr.type = nvme_tcp_rsp; |
518 | pdu->hdr.flags = 0; |
519 | pdu->hdr.hlen = sizeof(*pdu); |
520 | pdu->hdr.pdo = 0; |
521 | pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst); |
522 | if (cmd->queue->hdr_digest) { |
523 | pdu->hdr.flags |= NVME_TCP_F_HDGST; |
524 | nvmet_tcp_hdgst(hash: queue->snd_hash, pdu, len: sizeof(*pdu)); |
525 | } |
526 | } |
527 | |
528 | static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue) |
529 | { |
530 | struct llist_node *node; |
531 | struct nvmet_tcp_cmd *cmd; |
532 | |
533 | for (node = llist_del_all(head: &queue->resp_list); node; node = node->next) { |
534 | cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry); |
535 | list_add(new: &cmd->entry, head: &queue->resp_send_list); |
536 | queue->send_list_len++; |
537 | } |
538 | } |
539 | |
540 | static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue) |
541 | { |
542 | queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list, |
543 | struct nvmet_tcp_cmd, entry); |
544 | if (!queue->snd_cmd) { |
545 | nvmet_tcp_process_resp_list(queue); |
546 | queue->snd_cmd = |
547 | list_first_entry_or_null(&queue->resp_send_list, |
548 | struct nvmet_tcp_cmd, entry); |
549 | if (unlikely(!queue->snd_cmd)) |
550 | return NULL; |
551 | } |
552 | |
553 | list_del_init(entry: &queue->snd_cmd->entry); |
554 | queue->send_list_len--; |
555 | |
556 | if (nvmet_tcp_need_data_out(cmd: queue->snd_cmd)) |
557 | nvmet_setup_c2h_data_pdu(cmd: queue->snd_cmd); |
558 | else if (nvmet_tcp_need_data_in(cmd: queue->snd_cmd)) |
559 | nvmet_setup_r2t_pdu(cmd: queue->snd_cmd); |
560 | else |
561 | nvmet_setup_response_pdu(cmd: queue->snd_cmd); |
562 | |
563 | return queue->snd_cmd; |
564 | } |
565 | |
566 | static void nvmet_tcp_queue_response(struct nvmet_req *req) |
567 | { |
568 | struct nvmet_tcp_cmd *cmd = |
569 | container_of(req, struct nvmet_tcp_cmd, req); |
570 | struct nvmet_tcp_queue *queue = cmd->queue; |
571 | struct nvme_sgl_desc *sgl; |
572 | u32 len; |
573 | |
574 | if (unlikely(cmd == queue->cmd)) { |
575 | sgl = &cmd->req.cmd->common.dptr.sgl; |
576 | len = le32_to_cpu(sgl->length); |
577 | |
578 | /* |
579 | * Wait for inline data before processing the response. |
580 | * Avoid using helpers, this might happen before |
581 | * nvmet_req_init is completed. |
582 | */ |
583 | if (queue->rcv_state == NVMET_TCP_RECV_PDU && |
584 | len && len <= cmd->req.port->inline_data_size && |
585 | nvme_is_write(cmd: cmd->req.cmd)) |
586 | return; |
587 | } |
588 | |
589 | llist_add(new: &cmd->lentry, head: &queue->resp_list); |
590 | queue_work_on(cpu: queue_cpu(queue), wq: nvmet_tcp_wq, work: &cmd->queue->io_work); |
591 | } |
592 | |
593 | static void nvmet_tcp_execute_request(struct nvmet_tcp_cmd *cmd) |
594 | { |
595 | if (unlikely(cmd->flags & NVMET_TCP_F_INIT_FAILED)) |
596 | nvmet_tcp_queue_response(req: &cmd->req); |
597 | else |
598 | cmd->req.execute(&cmd->req); |
599 | } |
600 | |
601 | static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd) |
602 | { |
603 | struct msghdr msg = { |
604 | .msg_flags = MSG_DONTWAIT | MSG_MORE | MSG_SPLICE_PAGES, |
605 | }; |
606 | struct bio_vec bvec; |
607 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
608 | int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst; |
609 | int ret; |
610 | |
611 | bvec_set_virt(bv: &bvec, vaddr: (void *)cmd->data_pdu + cmd->offset, len: left); |
612 | iov_iter_bvec(i: &msg.msg_iter, ITER_SOURCE, bvec: &bvec, nr_segs: 1, count: left); |
613 | ret = sock_sendmsg(sock: cmd->queue->sock, msg: &msg); |
614 | if (ret <= 0) |
615 | return ret; |
616 | |
617 | cmd->offset += ret; |
618 | left -= ret; |
619 | |
620 | if (left) |
621 | return -EAGAIN; |
622 | |
623 | cmd->state = NVMET_TCP_SEND_DATA; |
624 | cmd->offset = 0; |
625 | return 1; |
626 | } |
627 | |
628 | static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
629 | { |
630 | struct nvmet_tcp_queue *queue = cmd->queue; |
631 | int ret; |
632 | |
633 | while (cmd->cur_sg) { |
634 | struct msghdr msg = { |
635 | .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES, |
636 | }; |
637 | struct page *page = sg_page(sg: cmd->cur_sg); |
638 | struct bio_vec bvec; |
639 | u32 left = cmd->cur_sg->length - cmd->offset; |
640 | |
641 | if ((!last_in_batch && cmd->queue->send_list_len) || |
642 | cmd->wbytes_done + left < cmd->req.transfer_len || |
643 | queue->data_digest || !queue->nvme_sq.sqhd_disabled) |
644 | msg.msg_flags |= MSG_MORE; |
645 | |
646 | bvec_set_page(bv: &bvec, page, len: left, offset: cmd->offset); |
647 | iov_iter_bvec(i: &msg.msg_iter, ITER_SOURCE, bvec: &bvec, nr_segs: 1, count: left); |
648 | ret = sock_sendmsg(sock: cmd->queue->sock, msg: &msg); |
649 | if (ret <= 0) |
650 | return ret; |
651 | |
652 | cmd->offset += ret; |
653 | cmd->wbytes_done += ret; |
654 | |
655 | /* Done with sg?*/ |
656 | if (cmd->offset == cmd->cur_sg->length) { |
657 | cmd->cur_sg = sg_next(cmd->cur_sg); |
658 | cmd->offset = 0; |
659 | } |
660 | } |
661 | |
662 | if (queue->data_digest) { |
663 | cmd->state = NVMET_TCP_SEND_DDGST; |
664 | cmd->offset = 0; |
665 | } else { |
666 | if (queue->nvme_sq.sqhd_disabled) { |
667 | cmd->queue->snd_cmd = NULL; |
668 | nvmet_tcp_put_cmd(cmd); |
669 | } else { |
670 | nvmet_setup_response_pdu(cmd); |
671 | } |
672 | } |
673 | |
674 | if (queue->nvme_sq.sqhd_disabled) |
675 | nvmet_tcp_free_cmd_buffers(cmd); |
676 | |
677 | return 1; |
678 | |
679 | } |
680 | |
681 | static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd, |
682 | bool last_in_batch) |
683 | { |
684 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES, }; |
685 | struct bio_vec bvec; |
686 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
687 | int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst; |
688 | int ret; |
689 | |
690 | if (!last_in_batch && cmd->queue->send_list_len) |
691 | msg.msg_flags |= MSG_MORE; |
692 | else |
693 | msg.msg_flags |= MSG_EOR; |
694 | |
695 | bvec_set_virt(bv: &bvec, vaddr: (void *)cmd->rsp_pdu + cmd->offset, len: left); |
696 | iov_iter_bvec(i: &msg.msg_iter, ITER_SOURCE, bvec: &bvec, nr_segs: 1, count: left); |
697 | ret = sock_sendmsg(sock: cmd->queue->sock, msg: &msg); |
698 | if (ret <= 0) |
699 | return ret; |
700 | cmd->offset += ret; |
701 | left -= ret; |
702 | |
703 | if (left) |
704 | return -EAGAIN; |
705 | |
706 | nvmet_tcp_free_cmd_buffers(cmd); |
707 | cmd->queue->snd_cmd = NULL; |
708 | nvmet_tcp_put_cmd(cmd); |
709 | return 1; |
710 | } |
711 | |
712 | static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
713 | { |
714 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES, }; |
715 | struct bio_vec bvec; |
716 | u8 hdgst = nvmet_tcp_hdgst_len(queue: cmd->queue); |
717 | int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst; |
718 | int ret; |
719 | |
720 | if (!last_in_batch && cmd->queue->send_list_len) |
721 | msg.msg_flags |= MSG_MORE; |
722 | else |
723 | msg.msg_flags |= MSG_EOR; |
724 | |
725 | bvec_set_virt(bv: &bvec, vaddr: (void *)cmd->r2t_pdu + cmd->offset, len: left); |
726 | iov_iter_bvec(i: &msg.msg_iter, ITER_SOURCE, bvec: &bvec, nr_segs: 1, count: left); |
727 | ret = sock_sendmsg(sock: cmd->queue->sock, msg: &msg); |
728 | if (ret <= 0) |
729 | return ret; |
730 | cmd->offset += ret; |
731 | left -= ret; |
732 | |
733 | if (left) |
734 | return -EAGAIN; |
735 | |
736 | cmd->queue->snd_cmd = NULL; |
737 | return 1; |
738 | } |
739 | |
740 | static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch) |
741 | { |
742 | struct nvmet_tcp_queue *queue = cmd->queue; |
743 | int left = NVME_TCP_DIGEST_LENGTH - cmd->offset; |
744 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
745 | struct kvec iov = { |
746 | .iov_base = (u8 *)&cmd->exp_ddgst + cmd->offset, |
747 | .iov_len = left |
748 | }; |
749 | int ret; |
750 | |
751 | if (!last_in_batch && cmd->queue->send_list_len) |
752 | msg.msg_flags |= MSG_MORE; |
753 | else |
754 | msg.msg_flags |= MSG_EOR; |
755 | |
756 | ret = kernel_sendmsg(sock: queue->sock, msg: &msg, vec: &iov, num: 1, len: iov.iov_len); |
757 | if (unlikely(ret <= 0)) |
758 | return ret; |
759 | |
760 | cmd->offset += ret; |
761 | left -= ret; |
762 | |
763 | if (left) |
764 | return -EAGAIN; |
765 | |
766 | if (queue->nvme_sq.sqhd_disabled) { |
767 | cmd->queue->snd_cmd = NULL; |
768 | nvmet_tcp_put_cmd(cmd); |
769 | } else { |
770 | nvmet_setup_response_pdu(cmd); |
771 | } |
772 | return 1; |
773 | } |
774 | |
775 | static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue, |
776 | bool last_in_batch) |
777 | { |
778 | struct nvmet_tcp_cmd *cmd = queue->snd_cmd; |
779 | int ret = 0; |
780 | |
781 | if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) { |
782 | cmd = nvmet_tcp_fetch_cmd(queue); |
783 | if (unlikely(!cmd)) |
784 | return 0; |
785 | } |
786 | |
787 | if (cmd->state == NVMET_TCP_SEND_DATA_PDU) { |
788 | ret = nvmet_try_send_data_pdu(cmd); |
789 | if (ret <= 0) |
790 | goto done_send; |
791 | } |
792 | |
793 | if (cmd->state == NVMET_TCP_SEND_DATA) { |
794 | ret = nvmet_try_send_data(cmd, last_in_batch); |
795 | if (ret <= 0) |
796 | goto done_send; |
797 | } |
798 | |
799 | if (cmd->state == NVMET_TCP_SEND_DDGST) { |
800 | ret = nvmet_try_send_ddgst(cmd, last_in_batch); |
801 | if (ret <= 0) |
802 | goto done_send; |
803 | } |
804 | |
805 | if (cmd->state == NVMET_TCP_SEND_R2T) { |
806 | ret = nvmet_try_send_r2t(cmd, last_in_batch); |
807 | if (ret <= 0) |
808 | goto done_send; |
809 | } |
810 | |
811 | if (cmd->state == NVMET_TCP_SEND_RESPONSE) |
812 | ret = nvmet_try_send_response(cmd, last_in_batch); |
813 | |
814 | done_send: |
815 | if (ret < 0) { |
816 | if (ret == -EAGAIN) |
817 | return 0; |
818 | return ret; |
819 | } |
820 | |
821 | return 1; |
822 | } |
823 | |
824 | static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue, |
825 | int budget, int *sends) |
826 | { |
827 | int i, ret = 0; |
828 | |
829 | for (i = 0; i < budget; i++) { |
830 | ret = nvmet_tcp_try_send_one(queue, last_in_batch: i == budget - 1); |
831 | if (unlikely(ret < 0)) { |
832 | nvmet_tcp_socket_error(queue, status: ret); |
833 | goto done; |
834 | } else if (ret == 0) { |
835 | break; |
836 | } |
837 | (*sends)++; |
838 | } |
839 | done: |
840 | return ret; |
841 | } |
842 | |
843 | static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue) |
844 | { |
845 | queue->offset = 0; |
846 | queue->left = sizeof(struct nvme_tcp_hdr); |
847 | queue->cmd = NULL; |
848 | queue->rcv_state = NVMET_TCP_RECV_PDU; |
849 | } |
850 | |
851 | static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue) |
852 | { |
853 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req: queue->rcv_hash); |
854 | |
855 | ahash_request_free(req: queue->rcv_hash); |
856 | ahash_request_free(req: queue->snd_hash); |
857 | crypto_free_ahash(tfm); |
858 | } |
859 | |
860 | static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue) |
861 | { |
862 | struct crypto_ahash *tfm; |
863 | |
864 | tfm = crypto_alloc_ahash(alg_name: "crc32c" , type: 0, CRYPTO_ALG_ASYNC); |
865 | if (IS_ERR(ptr: tfm)) |
866 | return PTR_ERR(ptr: tfm); |
867 | |
868 | queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
869 | if (!queue->snd_hash) |
870 | goto free_tfm; |
871 | ahash_request_set_callback(req: queue->snd_hash, flags: 0, NULL, NULL); |
872 | |
873 | queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
874 | if (!queue->rcv_hash) |
875 | goto free_snd_hash; |
876 | ahash_request_set_callback(req: queue->rcv_hash, flags: 0, NULL, NULL); |
877 | |
878 | return 0; |
879 | free_snd_hash: |
880 | ahash_request_free(req: queue->snd_hash); |
881 | free_tfm: |
882 | crypto_free_ahash(tfm); |
883 | return -ENOMEM; |
884 | } |
885 | |
886 | |
887 | static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue) |
888 | { |
889 | struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq; |
890 | struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp; |
891 | struct msghdr msg = {}; |
892 | struct kvec iov; |
893 | int ret; |
894 | |
895 | if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) { |
896 | pr_err("bad nvme-tcp pdu length (%d)\n" , |
897 | le32_to_cpu(icreq->hdr.plen)); |
898 | nvmet_tcp_fatal_error(queue); |
899 | } |
900 | |
901 | if (icreq->pfv != NVME_TCP_PFV_1_0) { |
902 | pr_err("queue %d: bad pfv %d\n" , queue->idx, icreq->pfv); |
903 | return -EPROTO; |
904 | } |
905 | |
906 | if (icreq->hpda != 0) { |
907 | pr_err("queue %d: unsupported hpda %d\n" , queue->idx, |
908 | icreq->hpda); |
909 | return -EPROTO; |
910 | } |
911 | |
912 | queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE); |
913 | queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE); |
914 | if (queue->hdr_digest || queue->data_digest) { |
915 | ret = nvmet_tcp_alloc_crypto(queue); |
916 | if (ret) |
917 | return ret; |
918 | } |
919 | |
920 | memset(icresp, 0, sizeof(*icresp)); |
921 | icresp->hdr.type = nvme_tcp_icresp; |
922 | icresp->hdr.hlen = sizeof(*icresp); |
923 | icresp->hdr.pdo = 0; |
924 | icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen); |
925 | icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0); |
926 | icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */ |
927 | icresp->cpda = 0; |
928 | if (queue->hdr_digest) |
929 | icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE; |
930 | if (queue->data_digest) |
931 | icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE; |
932 | |
933 | iov.iov_base = icresp; |
934 | iov.iov_len = sizeof(*icresp); |
935 | ret = kernel_sendmsg(sock: queue->sock, msg: &msg, vec: &iov, num: 1, len: iov.iov_len); |
936 | if (ret < 0) { |
937 | queue->state = NVMET_TCP_Q_FAILED; |
938 | return ret; /* queue removal will cleanup */ |
939 | } |
940 | |
941 | queue->state = NVMET_TCP_Q_LIVE; |
942 | nvmet_prepare_receive_pdu(queue); |
943 | return 0; |
944 | } |
945 | |
946 | static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue, |
947 | struct nvmet_tcp_cmd *cmd, struct nvmet_req *req) |
948 | { |
949 | size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length); |
950 | int ret; |
951 | |
952 | /* |
953 | * This command has not been processed yet, hence we are trying to |
954 | * figure out if there is still pending data left to receive. If |
955 | * we don't, we can simply prepare for the next pdu and bail out, |
956 | * otherwise we will need to prepare a buffer and receive the |
957 | * stale data before continuing forward. |
958 | */ |
959 | if (!nvme_is_write(cmd: cmd->req.cmd) || !data_len || |
960 | data_len > cmd->req.port->inline_data_size) { |
961 | nvmet_prepare_receive_pdu(queue); |
962 | return; |
963 | } |
964 | |
965 | ret = nvmet_tcp_map_data(cmd); |
966 | if (unlikely(ret)) { |
967 | pr_err("queue %d: failed to map data\n" , queue->idx); |
968 | nvmet_tcp_fatal_error(queue); |
969 | return; |
970 | } |
971 | |
972 | queue->rcv_state = NVMET_TCP_RECV_DATA; |
973 | nvmet_tcp_build_pdu_iovec(cmd); |
974 | cmd->flags |= NVMET_TCP_F_INIT_FAILED; |
975 | } |
976 | |
977 | static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue) |
978 | { |
979 | struct nvme_tcp_data_pdu *data = &queue->pdu.data; |
980 | struct nvmet_tcp_cmd *cmd; |
981 | |
982 | if (likely(queue->nr_cmds)) { |
983 | if (unlikely(data->ttag >= queue->nr_cmds)) { |
984 | pr_err("queue %d: received out of bound ttag %u, nr_cmds %u\n" , |
985 | queue->idx, data->ttag, queue->nr_cmds); |
986 | nvmet_tcp_fatal_error(queue); |
987 | return -EPROTO; |
988 | } |
989 | cmd = &queue->cmds[data->ttag]; |
990 | } else { |
991 | cmd = &queue->connect; |
992 | } |
993 | |
994 | if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) { |
995 | pr_err("ttag %u unexpected data offset %u (expected %u)\n" , |
996 | data->ttag, le32_to_cpu(data->data_offset), |
997 | cmd->rbytes_done); |
998 | /* FIXME: use path and transport errors */ |
999 | nvmet_req_complete(req: &cmd->req, |
1000 | status: NVME_SC_INVALID_FIELD | NVME_SC_DNR); |
1001 | return -EPROTO; |
1002 | } |
1003 | |
1004 | cmd->pdu_len = le32_to_cpu(data->data_length); |
1005 | cmd->pdu_recv = 0; |
1006 | nvmet_tcp_build_pdu_iovec(cmd); |
1007 | queue->cmd = cmd; |
1008 | queue->rcv_state = NVMET_TCP_RECV_DATA; |
1009 | |
1010 | return 0; |
1011 | } |
1012 | |
1013 | static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue) |
1014 | { |
1015 | struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr; |
1016 | struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd; |
1017 | struct nvmet_req *req; |
1018 | int ret; |
1019 | |
1020 | if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) { |
1021 | if (hdr->type != nvme_tcp_icreq) { |
1022 | pr_err("unexpected pdu type (%d) before icreq\n" , |
1023 | hdr->type); |
1024 | nvmet_tcp_fatal_error(queue); |
1025 | return -EPROTO; |
1026 | } |
1027 | return nvmet_tcp_handle_icreq(queue); |
1028 | } |
1029 | |
1030 | if (unlikely(hdr->type == nvme_tcp_icreq)) { |
1031 | pr_err("queue %d: received icreq pdu in state %d\n" , |
1032 | queue->idx, queue->state); |
1033 | nvmet_tcp_fatal_error(queue); |
1034 | return -EPROTO; |
1035 | } |
1036 | |
1037 | if (hdr->type == nvme_tcp_h2c_data) { |
1038 | ret = nvmet_tcp_handle_h2c_data_pdu(queue); |
1039 | if (unlikely(ret)) |
1040 | return ret; |
1041 | return 0; |
1042 | } |
1043 | |
1044 | queue->cmd = nvmet_tcp_get_cmd(queue); |
1045 | if (unlikely(!queue->cmd)) { |
1046 | /* This should never happen */ |
1047 | pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d" , |
1048 | queue->idx, queue->nr_cmds, queue->send_list_len, |
1049 | nvme_cmd->common.opcode); |
1050 | nvmet_tcp_fatal_error(queue); |
1051 | return -ENOMEM; |
1052 | } |
1053 | |
1054 | req = &queue->cmd->req; |
1055 | memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd)); |
1056 | |
1057 | if (unlikely(!nvmet_req_init(req, &queue->nvme_cq, |
1058 | &queue->nvme_sq, &nvmet_tcp_ops))) { |
1059 | pr_err("failed cmd %p id %d opcode %d, data_len: %d\n" , |
1060 | req->cmd, req->cmd->common.command_id, |
1061 | req->cmd->common.opcode, |
1062 | le32_to_cpu(req->cmd->common.dptr.sgl.length)); |
1063 | |
1064 | nvmet_tcp_handle_req_failure(queue, cmd: queue->cmd, req); |
1065 | return 0; |
1066 | } |
1067 | |
1068 | ret = nvmet_tcp_map_data(cmd: queue->cmd); |
1069 | if (unlikely(ret)) { |
1070 | pr_err("queue %d: failed to map data\n" , queue->idx); |
1071 | if (nvmet_tcp_has_inline_data(cmd: queue->cmd)) |
1072 | nvmet_tcp_fatal_error(queue); |
1073 | else |
1074 | nvmet_req_complete(req, status: ret); |
1075 | ret = -EAGAIN; |
1076 | goto out; |
1077 | } |
1078 | |
1079 | if (nvmet_tcp_need_data_in(cmd: queue->cmd)) { |
1080 | if (nvmet_tcp_has_inline_data(cmd: queue->cmd)) { |
1081 | queue->rcv_state = NVMET_TCP_RECV_DATA; |
1082 | nvmet_tcp_build_pdu_iovec(cmd: queue->cmd); |
1083 | return 0; |
1084 | } |
1085 | /* send back R2T */ |
1086 | nvmet_tcp_queue_response(req: &queue->cmd->req); |
1087 | goto out; |
1088 | } |
1089 | |
1090 | queue->cmd->req.execute(&queue->cmd->req); |
1091 | out: |
1092 | nvmet_prepare_receive_pdu(queue); |
1093 | return ret; |
1094 | } |
1095 | |
1096 | static const u8 nvme_tcp_pdu_sizes[] = { |
1097 | [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu), |
1098 | [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu), |
1099 | [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu), |
1100 | }; |
1101 | |
1102 | static inline u8 nvmet_tcp_pdu_size(u8 type) |
1103 | { |
1104 | size_t idx = type; |
1105 | |
1106 | return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) && |
1107 | nvme_tcp_pdu_sizes[idx]) ? |
1108 | nvme_tcp_pdu_sizes[idx] : 0; |
1109 | } |
1110 | |
1111 | static inline bool nvmet_tcp_pdu_valid(u8 type) |
1112 | { |
1113 | switch (type) { |
1114 | case nvme_tcp_icreq: |
1115 | case nvme_tcp_cmd: |
1116 | case nvme_tcp_h2c_data: |
1117 | /* fallthru */ |
1118 | return true; |
1119 | } |
1120 | |
1121 | return false; |
1122 | } |
1123 | |
1124 | static int nvmet_tcp_tls_record_ok(struct nvmet_tcp_queue *queue, |
1125 | struct msghdr *msg, char *cbuf) |
1126 | { |
1127 | struct cmsghdr *cmsg = (struct cmsghdr *)cbuf; |
1128 | u8 ctype, level, description; |
1129 | int ret = 0; |
1130 | |
1131 | ctype = tls_get_record_type(sk: queue->sock->sk, msg: cmsg); |
1132 | switch (ctype) { |
1133 | case 0: |
1134 | break; |
1135 | case TLS_RECORD_TYPE_DATA: |
1136 | break; |
1137 | case TLS_RECORD_TYPE_ALERT: |
1138 | tls_alert_recv(sk: queue->sock->sk, msg, level: &level, description: &description); |
1139 | if (level == TLS_ALERT_LEVEL_FATAL) { |
1140 | pr_err("queue %d: TLS Alert desc %u\n" , |
1141 | queue->idx, description); |
1142 | ret = -ENOTCONN; |
1143 | } else { |
1144 | pr_warn("queue %d: TLS Alert desc %u\n" , |
1145 | queue->idx, description); |
1146 | ret = -EAGAIN; |
1147 | } |
1148 | break; |
1149 | default: |
1150 | /* discard this record type */ |
1151 | pr_err("queue %d: TLS record %d unhandled\n" , |
1152 | queue->idx, ctype); |
1153 | ret = -EAGAIN; |
1154 | break; |
1155 | } |
1156 | return ret; |
1157 | } |
1158 | |
1159 | static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue) |
1160 | { |
1161 | struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr; |
1162 | int len, ret; |
1163 | struct kvec iov; |
1164 | char cbuf[CMSG_LEN(sizeof(char))] = {}; |
1165 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
1166 | |
1167 | recv: |
1168 | iov.iov_base = (void *)&queue->pdu + queue->offset; |
1169 | iov.iov_len = queue->left; |
1170 | if (queue->tls_pskid) { |
1171 | msg.msg_control = cbuf; |
1172 | msg.msg_controllen = sizeof(cbuf); |
1173 | } |
1174 | len = kernel_recvmsg(sock: queue->sock, msg: &msg, vec: &iov, num: 1, |
1175 | len: iov.iov_len, flags: msg.msg_flags); |
1176 | if (unlikely(len < 0)) |
1177 | return len; |
1178 | if (queue->tls_pskid) { |
1179 | ret = nvmet_tcp_tls_record_ok(queue, msg: &msg, cbuf); |
1180 | if (ret < 0) |
1181 | return ret; |
1182 | } |
1183 | |
1184 | queue->offset += len; |
1185 | queue->left -= len; |
1186 | if (queue->left) |
1187 | return -EAGAIN; |
1188 | |
1189 | if (queue->offset == sizeof(struct nvme_tcp_hdr)) { |
1190 | u8 hdgst = nvmet_tcp_hdgst_len(queue); |
1191 | |
1192 | if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) { |
1193 | pr_err("unexpected pdu type %d\n" , hdr->type); |
1194 | nvmet_tcp_fatal_error(queue); |
1195 | return -EIO; |
1196 | } |
1197 | |
1198 | if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) { |
1199 | pr_err("pdu %d bad hlen %d\n" , hdr->type, hdr->hlen); |
1200 | return -EIO; |
1201 | } |
1202 | |
1203 | queue->left = hdr->hlen - queue->offset + hdgst; |
1204 | goto recv; |
1205 | } |
1206 | |
1207 | if (queue->hdr_digest && |
1208 | nvmet_tcp_verify_hdgst(queue, pdu: &queue->pdu, len: hdr->hlen)) { |
1209 | nvmet_tcp_fatal_error(queue); /* fatal */ |
1210 | return -EPROTO; |
1211 | } |
1212 | |
1213 | if (queue->data_digest && |
1214 | nvmet_tcp_check_ddgst(queue, pdu: &queue->pdu)) { |
1215 | nvmet_tcp_fatal_error(queue); /* fatal */ |
1216 | return -EPROTO; |
1217 | } |
1218 | |
1219 | return nvmet_tcp_done_recv_pdu(queue); |
1220 | } |
1221 | |
1222 | static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd) |
1223 | { |
1224 | struct nvmet_tcp_queue *queue = cmd->queue; |
1225 | |
1226 | nvmet_tcp_calc_ddgst(hash: queue->rcv_hash, cmd); |
1227 | queue->offset = 0; |
1228 | queue->left = NVME_TCP_DIGEST_LENGTH; |
1229 | queue->rcv_state = NVMET_TCP_RECV_DDGST; |
1230 | } |
1231 | |
1232 | static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue) |
1233 | { |
1234 | struct nvmet_tcp_cmd *cmd = queue->cmd; |
1235 | int len, ret; |
1236 | |
1237 | while (msg_data_left(msg: &cmd->recv_msg)) { |
1238 | len = sock_recvmsg(sock: cmd->queue->sock, msg: &cmd->recv_msg, |
1239 | flags: cmd->recv_msg.msg_flags); |
1240 | if (len <= 0) |
1241 | return len; |
1242 | if (queue->tls_pskid) { |
1243 | ret = nvmet_tcp_tls_record_ok(queue: cmd->queue, |
1244 | msg: &cmd->recv_msg, cbuf: cmd->recv_cbuf); |
1245 | if (ret < 0) |
1246 | return ret; |
1247 | } |
1248 | |
1249 | cmd->pdu_recv += len; |
1250 | cmd->rbytes_done += len; |
1251 | } |
1252 | |
1253 | if (queue->data_digest) { |
1254 | nvmet_tcp_prep_recv_ddgst(cmd); |
1255 | return 0; |
1256 | } |
1257 | |
1258 | if (cmd->rbytes_done == cmd->req.transfer_len) |
1259 | nvmet_tcp_execute_request(cmd); |
1260 | |
1261 | nvmet_prepare_receive_pdu(queue); |
1262 | return 0; |
1263 | } |
1264 | |
1265 | static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue) |
1266 | { |
1267 | struct nvmet_tcp_cmd *cmd = queue->cmd; |
1268 | int ret, len; |
1269 | char cbuf[CMSG_LEN(sizeof(char))] = {}; |
1270 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT }; |
1271 | struct kvec iov = { |
1272 | .iov_base = (void *)&cmd->recv_ddgst + queue->offset, |
1273 | .iov_len = queue->left |
1274 | }; |
1275 | |
1276 | if (queue->tls_pskid) { |
1277 | msg.msg_control = cbuf; |
1278 | msg.msg_controllen = sizeof(cbuf); |
1279 | } |
1280 | len = kernel_recvmsg(sock: queue->sock, msg: &msg, vec: &iov, num: 1, |
1281 | len: iov.iov_len, flags: msg.msg_flags); |
1282 | if (unlikely(len < 0)) |
1283 | return len; |
1284 | if (queue->tls_pskid) { |
1285 | ret = nvmet_tcp_tls_record_ok(queue, msg: &msg, cbuf); |
1286 | if (ret < 0) |
1287 | return ret; |
1288 | } |
1289 | |
1290 | queue->offset += len; |
1291 | queue->left -= len; |
1292 | if (queue->left) |
1293 | return -EAGAIN; |
1294 | |
1295 | if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) { |
1296 | pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n" , |
1297 | queue->idx, cmd->req.cmd->common.command_id, |
1298 | queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst), |
1299 | le32_to_cpu(cmd->exp_ddgst)); |
1300 | nvmet_req_uninit(req: &cmd->req); |
1301 | nvmet_tcp_free_cmd_buffers(cmd); |
1302 | nvmet_tcp_fatal_error(queue); |
1303 | ret = -EPROTO; |
1304 | goto out; |
1305 | } |
1306 | |
1307 | if (cmd->rbytes_done == cmd->req.transfer_len) |
1308 | nvmet_tcp_execute_request(cmd); |
1309 | |
1310 | ret = 0; |
1311 | out: |
1312 | nvmet_prepare_receive_pdu(queue); |
1313 | return ret; |
1314 | } |
1315 | |
1316 | static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue) |
1317 | { |
1318 | int result = 0; |
1319 | |
1320 | if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR)) |
1321 | return 0; |
1322 | |
1323 | if (queue->rcv_state == NVMET_TCP_RECV_PDU) { |
1324 | result = nvmet_tcp_try_recv_pdu(queue); |
1325 | if (result != 0) |
1326 | goto done_recv; |
1327 | } |
1328 | |
1329 | if (queue->rcv_state == NVMET_TCP_RECV_DATA) { |
1330 | result = nvmet_tcp_try_recv_data(queue); |
1331 | if (result != 0) |
1332 | goto done_recv; |
1333 | } |
1334 | |
1335 | if (queue->rcv_state == NVMET_TCP_RECV_DDGST) { |
1336 | result = nvmet_tcp_try_recv_ddgst(queue); |
1337 | if (result != 0) |
1338 | goto done_recv; |
1339 | } |
1340 | |
1341 | done_recv: |
1342 | if (result < 0) { |
1343 | if (result == -EAGAIN) |
1344 | return 0; |
1345 | return result; |
1346 | } |
1347 | return 1; |
1348 | } |
1349 | |
1350 | static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue, |
1351 | int budget, int *recvs) |
1352 | { |
1353 | int i, ret = 0; |
1354 | |
1355 | for (i = 0; i < budget; i++) { |
1356 | ret = nvmet_tcp_try_recv_one(queue); |
1357 | if (unlikely(ret < 0)) { |
1358 | nvmet_tcp_socket_error(queue, status: ret); |
1359 | goto done; |
1360 | } else if (ret == 0) { |
1361 | break; |
1362 | } |
1363 | (*recvs)++; |
1364 | } |
1365 | done: |
1366 | return ret; |
1367 | } |
1368 | |
1369 | static void nvmet_tcp_release_queue(struct kref *kref) |
1370 | { |
1371 | struct nvmet_tcp_queue *queue = |
1372 | container_of(kref, struct nvmet_tcp_queue, kref); |
1373 | |
1374 | WARN_ON(queue->state != NVMET_TCP_Q_DISCONNECTING); |
1375 | queue_work(wq: nvmet_wq, work: &queue->release_work); |
1376 | } |
1377 | |
1378 | static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue) |
1379 | { |
1380 | spin_lock_bh(lock: &queue->state_lock); |
1381 | if (queue->state == NVMET_TCP_Q_TLS_HANDSHAKE) { |
1382 | /* Socket closed during handshake */ |
1383 | tls_handshake_cancel(sk: queue->sock->sk); |
1384 | } |
1385 | if (queue->state != NVMET_TCP_Q_DISCONNECTING) { |
1386 | queue->state = NVMET_TCP_Q_DISCONNECTING; |
1387 | kref_put(kref: &queue->kref, release: nvmet_tcp_release_queue); |
1388 | } |
1389 | spin_unlock_bh(lock: &queue->state_lock); |
1390 | } |
1391 | |
1392 | static inline void nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue *queue) |
1393 | { |
1394 | queue->poll_end = jiffies + usecs_to_jiffies(u: idle_poll_period_usecs); |
1395 | } |
1396 | |
1397 | static bool nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue *queue, |
1398 | int ops) |
1399 | { |
1400 | if (!idle_poll_period_usecs) |
1401 | return false; |
1402 | |
1403 | if (ops) |
1404 | nvmet_tcp_arm_queue_deadline(queue); |
1405 | |
1406 | return !time_after(jiffies, queue->poll_end); |
1407 | } |
1408 | |
1409 | static void nvmet_tcp_io_work(struct work_struct *w) |
1410 | { |
1411 | struct nvmet_tcp_queue *queue = |
1412 | container_of(w, struct nvmet_tcp_queue, io_work); |
1413 | bool pending; |
1414 | int ret, ops = 0; |
1415 | |
1416 | do { |
1417 | pending = false; |
1418 | |
1419 | ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, recvs: &ops); |
1420 | if (ret > 0) |
1421 | pending = true; |
1422 | else if (ret < 0) |
1423 | return; |
1424 | |
1425 | ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, sends: &ops); |
1426 | if (ret > 0) |
1427 | pending = true; |
1428 | else if (ret < 0) |
1429 | return; |
1430 | |
1431 | } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET); |
1432 | |
1433 | /* |
1434 | * Requeue the worker if idle deadline period is in progress or any |
1435 | * ops activity was recorded during the do-while loop above. |
1436 | */ |
1437 | if (nvmet_tcp_check_queue_deadline(queue, ops) || pending) |
1438 | queue_work_on(cpu: queue_cpu(queue), wq: nvmet_tcp_wq, work: &queue->io_work); |
1439 | } |
1440 | |
1441 | static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue, |
1442 | struct nvmet_tcp_cmd *c) |
1443 | { |
1444 | u8 hdgst = nvmet_tcp_hdgst_len(queue); |
1445 | |
1446 | c->queue = queue; |
1447 | c->req.port = queue->port->nport; |
1448 | |
1449 | c->cmd_pdu = page_frag_alloc(nc: &queue->pf_cache, |
1450 | fragsz: sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
1451 | if (!c->cmd_pdu) |
1452 | return -ENOMEM; |
1453 | c->req.cmd = &c->cmd_pdu->cmd; |
1454 | |
1455 | c->rsp_pdu = page_frag_alloc(nc: &queue->pf_cache, |
1456 | fragsz: sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
1457 | if (!c->rsp_pdu) |
1458 | goto out_free_cmd; |
1459 | c->req.cqe = &c->rsp_pdu->cqe; |
1460 | |
1461 | c->data_pdu = page_frag_alloc(nc: &queue->pf_cache, |
1462 | fragsz: sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
1463 | if (!c->data_pdu) |
1464 | goto out_free_rsp; |
1465 | |
1466 | c->r2t_pdu = page_frag_alloc(nc: &queue->pf_cache, |
1467 | fragsz: sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO); |
1468 | if (!c->r2t_pdu) |
1469 | goto out_free_data; |
1470 | |
1471 | if (queue->state == NVMET_TCP_Q_TLS_HANDSHAKE) { |
1472 | c->recv_msg.msg_control = c->recv_cbuf; |
1473 | c->recv_msg.msg_controllen = sizeof(c->recv_cbuf); |
1474 | } |
1475 | c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1476 | |
1477 | list_add_tail(new: &c->entry, head: &queue->free_list); |
1478 | |
1479 | return 0; |
1480 | out_free_data: |
1481 | page_frag_free(addr: c->data_pdu); |
1482 | out_free_rsp: |
1483 | page_frag_free(addr: c->rsp_pdu); |
1484 | out_free_cmd: |
1485 | page_frag_free(addr: c->cmd_pdu); |
1486 | return -ENOMEM; |
1487 | } |
1488 | |
1489 | static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c) |
1490 | { |
1491 | page_frag_free(addr: c->r2t_pdu); |
1492 | page_frag_free(addr: c->data_pdu); |
1493 | page_frag_free(addr: c->rsp_pdu); |
1494 | page_frag_free(addr: c->cmd_pdu); |
1495 | } |
1496 | |
1497 | static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue) |
1498 | { |
1499 | struct nvmet_tcp_cmd *cmds; |
1500 | int i, ret = -EINVAL, nr_cmds = queue->nr_cmds; |
1501 | |
1502 | cmds = kcalloc(n: nr_cmds, size: sizeof(struct nvmet_tcp_cmd), GFP_KERNEL); |
1503 | if (!cmds) |
1504 | goto out; |
1505 | |
1506 | for (i = 0; i < nr_cmds; i++) { |
1507 | ret = nvmet_tcp_alloc_cmd(queue, c: cmds + i); |
1508 | if (ret) |
1509 | goto out_free; |
1510 | } |
1511 | |
1512 | queue->cmds = cmds; |
1513 | |
1514 | return 0; |
1515 | out_free: |
1516 | while (--i >= 0) |
1517 | nvmet_tcp_free_cmd(c: cmds + i); |
1518 | kfree(objp: cmds); |
1519 | out: |
1520 | return ret; |
1521 | } |
1522 | |
1523 | static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue) |
1524 | { |
1525 | struct nvmet_tcp_cmd *cmds = queue->cmds; |
1526 | int i; |
1527 | |
1528 | for (i = 0; i < queue->nr_cmds; i++) |
1529 | nvmet_tcp_free_cmd(c: cmds + i); |
1530 | |
1531 | nvmet_tcp_free_cmd(c: &queue->connect); |
1532 | kfree(objp: cmds); |
1533 | } |
1534 | |
1535 | static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue) |
1536 | { |
1537 | struct socket *sock = queue->sock; |
1538 | |
1539 | write_lock_bh(&sock->sk->sk_callback_lock); |
1540 | sock->sk->sk_data_ready = queue->data_ready; |
1541 | sock->sk->sk_state_change = queue->state_change; |
1542 | sock->sk->sk_write_space = queue->write_space; |
1543 | sock->sk->sk_user_data = NULL; |
1544 | write_unlock_bh(&sock->sk->sk_callback_lock); |
1545 | } |
1546 | |
1547 | static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue) |
1548 | { |
1549 | struct nvmet_tcp_cmd *cmd = queue->cmds; |
1550 | int i; |
1551 | |
1552 | for (i = 0; i < queue->nr_cmds; i++, cmd++) { |
1553 | if (nvmet_tcp_need_data_in(cmd)) |
1554 | nvmet_req_uninit(req: &cmd->req); |
1555 | } |
1556 | |
1557 | if (!queue->nr_cmds && nvmet_tcp_need_data_in(cmd: &queue->connect)) { |
1558 | /* failed in connect */ |
1559 | nvmet_req_uninit(req: &queue->connect.req); |
1560 | } |
1561 | } |
1562 | |
1563 | static void nvmet_tcp_free_cmd_data_in_buffers(struct nvmet_tcp_queue *queue) |
1564 | { |
1565 | struct nvmet_tcp_cmd *cmd = queue->cmds; |
1566 | int i; |
1567 | |
1568 | for (i = 0; i < queue->nr_cmds; i++, cmd++) { |
1569 | if (nvmet_tcp_need_data_in(cmd)) |
1570 | nvmet_tcp_free_cmd_buffers(cmd); |
1571 | } |
1572 | |
1573 | if (!queue->nr_cmds && nvmet_tcp_need_data_in(cmd: &queue->connect)) |
1574 | nvmet_tcp_free_cmd_buffers(cmd: &queue->connect); |
1575 | } |
1576 | |
1577 | static void nvmet_tcp_release_queue_work(struct work_struct *w) |
1578 | { |
1579 | struct page *page; |
1580 | struct nvmet_tcp_queue *queue = |
1581 | container_of(w, struct nvmet_tcp_queue, release_work); |
1582 | |
1583 | mutex_lock(&nvmet_tcp_queue_mutex); |
1584 | list_del_init(entry: &queue->queue_list); |
1585 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
1586 | |
1587 | nvmet_tcp_restore_socket_callbacks(queue); |
1588 | cancel_delayed_work_sync(dwork: &queue->tls_handshake_tmo_work); |
1589 | cancel_work_sync(work: &queue->io_work); |
1590 | /* stop accepting incoming data */ |
1591 | queue->rcv_state = NVMET_TCP_RECV_ERR; |
1592 | |
1593 | nvmet_tcp_uninit_data_in_cmds(queue); |
1594 | nvmet_sq_destroy(sq: &queue->nvme_sq); |
1595 | cancel_work_sync(work: &queue->io_work); |
1596 | nvmet_tcp_free_cmd_data_in_buffers(queue); |
1597 | /* ->sock will be released by fput() */ |
1598 | fput(queue->sock->file); |
1599 | nvmet_tcp_free_cmds(queue); |
1600 | if (queue->hdr_digest || queue->data_digest) |
1601 | nvmet_tcp_free_crypto(queue); |
1602 | ida_free(&nvmet_tcp_queue_ida, id: queue->idx); |
1603 | page = virt_to_head_page(x: queue->pf_cache.va); |
1604 | __page_frag_cache_drain(page, count: queue->pf_cache.pagecnt_bias); |
1605 | kfree(objp: queue); |
1606 | } |
1607 | |
1608 | static void nvmet_tcp_data_ready(struct sock *sk) |
1609 | { |
1610 | struct nvmet_tcp_queue *queue; |
1611 | |
1612 | trace_sk_data_ready(sk); |
1613 | |
1614 | read_lock_bh(&sk->sk_callback_lock); |
1615 | queue = sk->sk_user_data; |
1616 | if (likely(queue)) { |
1617 | if (queue->data_ready) |
1618 | queue->data_ready(sk); |
1619 | if (queue->state != NVMET_TCP_Q_TLS_HANDSHAKE) |
1620 | queue_work_on(cpu: queue_cpu(queue), wq: nvmet_tcp_wq, |
1621 | work: &queue->io_work); |
1622 | } |
1623 | read_unlock_bh(&sk->sk_callback_lock); |
1624 | } |
1625 | |
1626 | static void nvmet_tcp_write_space(struct sock *sk) |
1627 | { |
1628 | struct nvmet_tcp_queue *queue; |
1629 | |
1630 | read_lock_bh(&sk->sk_callback_lock); |
1631 | queue = sk->sk_user_data; |
1632 | if (unlikely(!queue)) |
1633 | goto out; |
1634 | |
1635 | if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) { |
1636 | queue->write_space(sk); |
1637 | goto out; |
1638 | } |
1639 | |
1640 | if (sk_stream_is_writeable(sk)) { |
1641 | clear_bit(SOCK_NOSPACE, addr: &sk->sk_socket->flags); |
1642 | queue_work_on(cpu: queue_cpu(queue), wq: nvmet_tcp_wq, work: &queue->io_work); |
1643 | } |
1644 | out: |
1645 | read_unlock_bh(&sk->sk_callback_lock); |
1646 | } |
1647 | |
1648 | static void nvmet_tcp_state_change(struct sock *sk) |
1649 | { |
1650 | struct nvmet_tcp_queue *queue; |
1651 | |
1652 | read_lock_bh(&sk->sk_callback_lock); |
1653 | queue = sk->sk_user_data; |
1654 | if (!queue) |
1655 | goto done; |
1656 | |
1657 | switch (sk->sk_state) { |
1658 | case TCP_FIN_WAIT2: |
1659 | case TCP_LAST_ACK: |
1660 | break; |
1661 | case TCP_FIN_WAIT1: |
1662 | case TCP_CLOSE_WAIT: |
1663 | case TCP_CLOSE: |
1664 | /* FALLTHRU */ |
1665 | nvmet_tcp_schedule_release_queue(queue); |
1666 | break; |
1667 | default: |
1668 | pr_warn("queue %d unhandled state %d\n" , |
1669 | queue->idx, sk->sk_state); |
1670 | } |
1671 | done: |
1672 | read_unlock_bh(&sk->sk_callback_lock); |
1673 | } |
1674 | |
1675 | static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue) |
1676 | { |
1677 | struct socket *sock = queue->sock; |
1678 | struct inet_sock *inet = inet_sk(sock->sk); |
1679 | int ret; |
1680 | |
1681 | ret = kernel_getsockname(sock, |
1682 | addr: (struct sockaddr *)&queue->sockaddr); |
1683 | if (ret < 0) |
1684 | return ret; |
1685 | |
1686 | ret = kernel_getpeername(sock, |
1687 | addr: (struct sockaddr *)&queue->sockaddr_peer); |
1688 | if (ret < 0) |
1689 | return ret; |
1690 | |
1691 | /* |
1692 | * Cleanup whatever is sitting in the TCP transmit queue on socket |
1693 | * close. This is done to prevent stale data from being sent should |
1694 | * the network connection be restored before TCP times out. |
1695 | */ |
1696 | sock_no_linger(sk: sock->sk); |
1697 | |
1698 | if (so_priority > 0) |
1699 | sock_set_priority(sk: sock->sk, priority: so_priority); |
1700 | |
1701 | /* Set socket type of service */ |
1702 | if (inet->rcv_tos > 0) |
1703 | ip_sock_set_tos(sk: sock->sk, val: inet->rcv_tos); |
1704 | |
1705 | ret = 0; |
1706 | write_lock_bh(&sock->sk->sk_callback_lock); |
1707 | if (sock->sk->sk_state != TCP_ESTABLISHED) { |
1708 | /* |
1709 | * If the socket is already closing, don't even start |
1710 | * consuming it |
1711 | */ |
1712 | ret = -ENOTCONN; |
1713 | } else { |
1714 | sock->sk->sk_user_data = queue; |
1715 | queue->data_ready = sock->sk->sk_data_ready; |
1716 | sock->sk->sk_data_ready = nvmet_tcp_data_ready; |
1717 | queue->state_change = sock->sk->sk_state_change; |
1718 | sock->sk->sk_state_change = nvmet_tcp_state_change; |
1719 | queue->write_space = sock->sk->sk_write_space; |
1720 | sock->sk->sk_write_space = nvmet_tcp_write_space; |
1721 | if (idle_poll_period_usecs) |
1722 | nvmet_tcp_arm_queue_deadline(queue); |
1723 | queue_work_on(cpu: queue_cpu(queue), wq: nvmet_tcp_wq, work: &queue->io_work); |
1724 | } |
1725 | write_unlock_bh(&sock->sk->sk_callback_lock); |
1726 | |
1727 | return ret; |
1728 | } |
1729 | |
1730 | #ifdef CONFIG_NVME_TARGET_TCP_TLS |
1731 | static int nvmet_tcp_try_peek_pdu(struct nvmet_tcp_queue *queue) |
1732 | { |
1733 | struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr; |
1734 | int len, ret; |
1735 | struct kvec iov = { |
1736 | .iov_base = (u8 *)&queue->pdu + queue->offset, |
1737 | .iov_len = sizeof(struct nvme_tcp_hdr), |
1738 | }; |
1739 | char cbuf[CMSG_LEN(sizeof(char))] = {}; |
1740 | struct msghdr msg = { |
1741 | .msg_control = cbuf, |
1742 | .msg_controllen = sizeof(cbuf), |
1743 | .msg_flags = MSG_PEEK, |
1744 | }; |
1745 | |
1746 | if (nvmet_port_secure_channel_required(port: queue->port->nport)) |
1747 | return 0; |
1748 | |
1749 | len = kernel_recvmsg(sock: queue->sock, msg: &msg, vec: &iov, num: 1, |
1750 | len: iov.iov_len, flags: msg.msg_flags); |
1751 | if (unlikely(len < 0)) { |
1752 | pr_debug("queue %d: peek error %d\n" , |
1753 | queue->idx, len); |
1754 | return len; |
1755 | } |
1756 | |
1757 | ret = nvmet_tcp_tls_record_ok(queue, msg: &msg, cbuf); |
1758 | if (ret < 0) |
1759 | return ret; |
1760 | |
1761 | if (len < sizeof(struct nvme_tcp_hdr)) { |
1762 | pr_debug("queue %d: short read, %d bytes missing\n" , |
1763 | queue->idx, (int)iov.iov_len - len); |
1764 | return -EAGAIN; |
1765 | } |
1766 | pr_debug("queue %d: hdr type %d hlen %d plen %d size %d\n" , |
1767 | queue->idx, hdr->type, hdr->hlen, hdr->plen, |
1768 | (int)sizeof(struct nvme_tcp_icreq_pdu)); |
1769 | if (hdr->type == nvme_tcp_icreq && |
1770 | hdr->hlen == sizeof(struct nvme_tcp_icreq_pdu) && |
1771 | hdr->plen == (__le32)sizeof(struct nvme_tcp_icreq_pdu)) { |
1772 | pr_debug("queue %d: icreq detected\n" , |
1773 | queue->idx); |
1774 | return len; |
1775 | } |
1776 | return 0; |
1777 | } |
1778 | |
1779 | static void nvmet_tcp_tls_handshake_done(void *data, int status, |
1780 | key_serial_t peerid) |
1781 | { |
1782 | struct nvmet_tcp_queue *queue = data; |
1783 | |
1784 | pr_debug("queue %d: TLS handshake done, key %x, status %d\n" , |
1785 | queue->idx, peerid, status); |
1786 | spin_lock_bh(lock: &queue->state_lock); |
1787 | if (WARN_ON(queue->state != NVMET_TCP_Q_TLS_HANDSHAKE)) { |
1788 | spin_unlock_bh(lock: &queue->state_lock); |
1789 | return; |
1790 | } |
1791 | if (!status) { |
1792 | queue->tls_pskid = peerid; |
1793 | queue->state = NVMET_TCP_Q_CONNECTING; |
1794 | } else |
1795 | queue->state = NVMET_TCP_Q_FAILED; |
1796 | spin_unlock_bh(lock: &queue->state_lock); |
1797 | |
1798 | cancel_delayed_work_sync(dwork: &queue->tls_handshake_tmo_work); |
1799 | if (status) |
1800 | nvmet_tcp_schedule_release_queue(queue); |
1801 | else |
1802 | nvmet_tcp_set_queue_sock(queue); |
1803 | kref_put(kref: &queue->kref, release: nvmet_tcp_release_queue); |
1804 | } |
1805 | |
1806 | static void nvmet_tcp_tls_handshake_timeout(struct work_struct *w) |
1807 | { |
1808 | struct nvmet_tcp_queue *queue = container_of(to_delayed_work(w), |
1809 | struct nvmet_tcp_queue, tls_handshake_tmo_work); |
1810 | |
1811 | pr_warn("queue %d: TLS handshake timeout\n" , queue->idx); |
1812 | /* |
1813 | * If tls_handshake_cancel() fails we've lost the race with |
1814 | * nvmet_tcp_tls_handshake_done() */ |
1815 | if (!tls_handshake_cancel(sk: queue->sock->sk)) |
1816 | return; |
1817 | spin_lock_bh(lock: &queue->state_lock); |
1818 | if (WARN_ON(queue->state != NVMET_TCP_Q_TLS_HANDSHAKE)) { |
1819 | spin_unlock_bh(lock: &queue->state_lock); |
1820 | return; |
1821 | } |
1822 | queue->state = NVMET_TCP_Q_FAILED; |
1823 | spin_unlock_bh(lock: &queue->state_lock); |
1824 | nvmet_tcp_schedule_release_queue(queue); |
1825 | kref_put(kref: &queue->kref, release: nvmet_tcp_release_queue); |
1826 | } |
1827 | |
1828 | static int nvmet_tcp_tls_handshake(struct nvmet_tcp_queue *queue) |
1829 | { |
1830 | int ret = -EOPNOTSUPP; |
1831 | struct tls_handshake_args args; |
1832 | |
1833 | if (queue->state != NVMET_TCP_Q_TLS_HANDSHAKE) { |
1834 | pr_warn("cannot start TLS in state %d\n" , queue->state); |
1835 | return -EINVAL; |
1836 | } |
1837 | |
1838 | kref_get(kref: &queue->kref); |
1839 | pr_debug("queue %d: TLS ServerHello\n" , queue->idx); |
1840 | memset(&args, 0, sizeof(args)); |
1841 | args.ta_sock = queue->sock; |
1842 | args.ta_done = nvmet_tcp_tls_handshake_done; |
1843 | args.ta_data = queue; |
1844 | args.ta_keyring = key_serial(key: queue->port->nport->keyring); |
1845 | args.ta_timeout_ms = tls_handshake_timeout * 1000; |
1846 | |
1847 | ret = tls_server_hello_psk(args: &args, GFP_KERNEL); |
1848 | if (ret) { |
1849 | kref_put(kref: &queue->kref, release: nvmet_tcp_release_queue); |
1850 | pr_err("failed to start TLS, err=%d\n" , ret); |
1851 | } else { |
1852 | queue_delayed_work(wq: nvmet_wq, dwork: &queue->tls_handshake_tmo_work, |
1853 | delay: tls_handshake_timeout * HZ); |
1854 | } |
1855 | return ret; |
1856 | } |
1857 | #endif |
1858 | |
1859 | static void nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port, |
1860 | struct socket *newsock) |
1861 | { |
1862 | struct nvmet_tcp_queue *queue; |
1863 | struct file *sock_file = NULL; |
1864 | int ret; |
1865 | |
1866 | queue = kzalloc(size: sizeof(*queue), GFP_KERNEL); |
1867 | if (!queue) { |
1868 | ret = -ENOMEM; |
1869 | goto out_release; |
1870 | } |
1871 | |
1872 | INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work); |
1873 | INIT_WORK(&queue->io_work, nvmet_tcp_io_work); |
1874 | kref_init(kref: &queue->kref); |
1875 | queue->sock = newsock; |
1876 | queue->port = port; |
1877 | queue->nr_cmds = 0; |
1878 | spin_lock_init(&queue->state_lock); |
1879 | if (queue->port->nport->disc_addr.tsas.tcp.sectype == |
1880 | NVMF_TCP_SECTYPE_TLS13) |
1881 | queue->state = NVMET_TCP_Q_TLS_HANDSHAKE; |
1882 | else |
1883 | queue->state = NVMET_TCP_Q_CONNECTING; |
1884 | INIT_LIST_HEAD(list: &queue->free_list); |
1885 | init_llist_head(list: &queue->resp_list); |
1886 | INIT_LIST_HEAD(list: &queue->resp_send_list); |
1887 | |
1888 | sock_file = sock_alloc_file(sock: queue->sock, O_CLOEXEC, NULL); |
1889 | if (IS_ERR(ptr: sock_file)) { |
1890 | ret = PTR_ERR(ptr: sock_file); |
1891 | goto out_free_queue; |
1892 | } |
1893 | |
1894 | queue->idx = ida_alloc(ida: &nvmet_tcp_queue_ida, GFP_KERNEL); |
1895 | if (queue->idx < 0) { |
1896 | ret = queue->idx; |
1897 | goto out_sock; |
1898 | } |
1899 | |
1900 | ret = nvmet_tcp_alloc_cmd(queue, c: &queue->connect); |
1901 | if (ret) |
1902 | goto out_ida_remove; |
1903 | |
1904 | ret = nvmet_sq_init(sq: &queue->nvme_sq); |
1905 | if (ret) |
1906 | goto out_free_connect; |
1907 | |
1908 | nvmet_prepare_receive_pdu(queue); |
1909 | |
1910 | mutex_lock(&nvmet_tcp_queue_mutex); |
1911 | list_add_tail(new: &queue->queue_list, head: &nvmet_tcp_queue_list); |
1912 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
1913 | |
1914 | #ifdef CONFIG_NVME_TARGET_TCP_TLS |
1915 | INIT_DELAYED_WORK(&queue->tls_handshake_tmo_work, |
1916 | nvmet_tcp_tls_handshake_timeout); |
1917 | if (queue->state == NVMET_TCP_Q_TLS_HANDSHAKE) { |
1918 | struct sock *sk = queue->sock->sk; |
1919 | |
1920 | /* Restore the default callbacks before starting upcall */ |
1921 | read_lock_bh(&sk->sk_callback_lock); |
1922 | sk->sk_user_data = NULL; |
1923 | sk->sk_data_ready = port->data_ready; |
1924 | read_unlock_bh(&sk->sk_callback_lock); |
1925 | if (!nvmet_tcp_try_peek_pdu(queue)) { |
1926 | if (!nvmet_tcp_tls_handshake(queue)) |
1927 | return; |
1928 | /* TLS handshake failed, terminate the connection */ |
1929 | goto out_destroy_sq; |
1930 | } |
1931 | /* Not a TLS connection, continue with normal processing */ |
1932 | queue->state = NVMET_TCP_Q_CONNECTING; |
1933 | } |
1934 | #endif |
1935 | |
1936 | ret = nvmet_tcp_set_queue_sock(queue); |
1937 | if (ret) |
1938 | goto out_destroy_sq; |
1939 | |
1940 | return; |
1941 | out_destroy_sq: |
1942 | mutex_lock(&nvmet_tcp_queue_mutex); |
1943 | list_del_init(entry: &queue->queue_list); |
1944 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
1945 | nvmet_sq_destroy(sq: &queue->nvme_sq); |
1946 | out_free_connect: |
1947 | nvmet_tcp_free_cmd(c: &queue->connect); |
1948 | out_ida_remove: |
1949 | ida_free(&nvmet_tcp_queue_ida, id: queue->idx); |
1950 | out_sock: |
1951 | fput(queue->sock->file); |
1952 | out_free_queue: |
1953 | kfree(objp: queue); |
1954 | out_release: |
1955 | pr_err("failed to allocate queue, error %d\n" , ret); |
1956 | if (!sock_file) |
1957 | sock_release(sock: newsock); |
1958 | } |
1959 | |
1960 | static void nvmet_tcp_accept_work(struct work_struct *w) |
1961 | { |
1962 | struct nvmet_tcp_port *port = |
1963 | container_of(w, struct nvmet_tcp_port, accept_work); |
1964 | struct socket *newsock; |
1965 | int ret; |
1966 | |
1967 | while (true) { |
1968 | ret = kernel_accept(sock: port->sock, newsock: &newsock, O_NONBLOCK); |
1969 | if (ret < 0) { |
1970 | if (ret != -EAGAIN) |
1971 | pr_warn("failed to accept err=%d\n" , ret); |
1972 | return; |
1973 | } |
1974 | nvmet_tcp_alloc_queue(port, newsock); |
1975 | } |
1976 | } |
1977 | |
1978 | static void nvmet_tcp_listen_data_ready(struct sock *sk) |
1979 | { |
1980 | struct nvmet_tcp_port *port; |
1981 | |
1982 | trace_sk_data_ready(sk); |
1983 | |
1984 | read_lock_bh(&sk->sk_callback_lock); |
1985 | port = sk->sk_user_data; |
1986 | if (!port) |
1987 | goto out; |
1988 | |
1989 | if (sk->sk_state == TCP_LISTEN) |
1990 | queue_work(wq: nvmet_wq, work: &port->accept_work); |
1991 | out: |
1992 | read_unlock_bh(&sk->sk_callback_lock); |
1993 | } |
1994 | |
1995 | static int nvmet_tcp_add_port(struct nvmet_port *nport) |
1996 | { |
1997 | struct nvmet_tcp_port *port; |
1998 | __kernel_sa_family_t af; |
1999 | int ret; |
2000 | |
2001 | port = kzalloc(size: sizeof(*port), GFP_KERNEL); |
2002 | if (!port) |
2003 | return -ENOMEM; |
2004 | |
2005 | switch (nport->disc_addr.adrfam) { |
2006 | case NVMF_ADDR_FAMILY_IP4: |
2007 | af = AF_INET; |
2008 | break; |
2009 | case NVMF_ADDR_FAMILY_IP6: |
2010 | af = AF_INET6; |
2011 | break; |
2012 | default: |
2013 | pr_err("address family %d not supported\n" , |
2014 | nport->disc_addr.adrfam); |
2015 | ret = -EINVAL; |
2016 | goto err_port; |
2017 | } |
2018 | |
2019 | ret = inet_pton_with_scope(net: &init_net, af, src: nport->disc_addr.traddr, |
2020 | port: nport->disc_addr.trsvcid, addr: &port->addr); |
2021 | if (ret) { |
2022 | pr_err("malformed ip/port passed: %s:%s\n" , |
2023 | nport->disc_addr.traddr, nport->disc_addr.trsvcid); |
2024 | goto err_port; |
2025 | } |
2026 | |
2027 | port->nport = nport; |
2028 | INIT_WORK(&port->accept_work, nvmet_tcp_accept_work); |
2029 | if (port->nport->inline_data_size < 0) |
2030 | port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE; |
2031 | |
2032 | ret = sock_create(family: port->addr.ss_family, type: SOCK_STREAM, |
2033 | IPPROTO_TCP, res: &port->sock); |
2034 | if (ret) { |
2035 | pr_err("failed to create a socket\n" ); |
2036 | goto err_port; |
2037 | } |
2038 | |
2039 | port->sock->sk->sk_user_data = port; |
2040 | port->data_ready = port->sock->sk->sk_data_ready; |
2041 | port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready; |
2042 | sock_set_reuseaddr(sk: port->sock->sk); |
2043 | tcp_sock_set_nodelay(sk: port->sock->sk); |
2044 | if (so_priority > 0) |
2045 | sock_set_priority(sk: port->sock->sk, priority: so_priority); |
2046 | |
2047 | ret = kernel_bind(sock: port->sock, addr: (struct sockaddr *)&port->addr, |
2048 | addrlen: sizeof(port->addr)); |
2049 | if (ret) { |
2050 | pr_err("failed to bind port socket %d\n" , ret); |
2051 | goto err_sock; |
2052 | } |
2053 | |
2054 | ret = kernel_listen(sock: port->sock, backlog: 128); |
2055 | if (ret) { |
2056 | pr_err("failed to listen %d on port sock\n" , ret); |
2057 | goto err_sock; |
2058 | } |
2059 | |
2060 | nport->priv = port; |
2061 | pr_info("enabling port %d (%pISpc)\n" , |
2062 | le16_to_cpu(nport->disc_addr.portid), &port->addr); |
2063 | |
2064 | return 0; |
2065 | |
2066 | err_sock: |
2067 | sock_release(sock: port->sock); |
2068 | err_port: |
2069 | kfree(objp: port); |
2070 | return ret; |
2071 | } |
2072 | |
2073 | static void nvmet_tcp_destroy_port_queues(struct nvmet_tcp_port *port) |
2074 | { |
2075 | struct nvmet_tcp_queue *queue; |
2076 | |
2077 | mutex_lock(&nvmet_tcp_queue_mutex); |
2078 | list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list) |
2079 | if (queue->port == port) |
2080 | kernel_sock_shutdown(sock: queue->sock, how: SHUT_RDWR); |
2081 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
2082 | } |
2083 | |
2084 | static void nvmet_tcp_remove_port(struct nvmet_port *nport) |
2085 | { |
2086 | struct nvmet_tcp_port *port = nport->priv; |
2087 | |
2088 | write_lock_bh(&port->sock->sk->sk_callback_lock); |
2089 | port->sock->sk->sk_data_ready = port->data_ready; |
2090 | port->sock->sk->sk_user_data = NULL; |
2091 | write_unlock_bh(&port->sock->sk->sk_callback_lock); |
2092 | cancel_work_sync(work: &port->accept_work); |
2093 | /* |
2094 | * Destroy the remaining queues, which are not belong to any |
2095 | * controller yet. |
2096 | */ |
2097 | nvmet_tcp_destroy_port_queues(port); |
2098 | |
2099 | sock_release(sock: port->sock); |
2100 | kfree(objp: port); |
2101 | } |
2102 | |
2103 | static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl) |
2104 | { |
2105 | struct nvmet_tcp_queue *queue; |
2106 | |
2107 | mutex_lock(&nvmet_tcp_queue_mutex); |
2108 | list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list) |
2109 | if (queue->nvme_sq.ctrl == ctrl) |
2110 | kernel_sock_shutdown(sock: queue->sock, how: SHUT_RDWR); |
2111 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
2112 | } |
2113 | |
2114 | static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq) |
2115 | { |
2116 | struct nvmet_tcp_queue *queue = |
2117 | container_of(sq, struct nvmet_tcp_queue, nvme_sq); |
2118 | |
2119 | if (sq->qid == 0) { |
2120 | /* Let inflight controller teardown complete */ |
2121 | flush_workqueue(nvmet_wq); |
2122 | } |
2123 | |
2124 | queue->nr_cmds = sq->size * 2; |
2125 | if (nvmet_tcp_alloc_cmds(queue)) |
2126 | return NVME_SC_INTERNAL; |
2127 | return 0; |
2128 | } |
2129 | |
2130 | static void nvmet_tcp_disc_port_addr(struct nvmet_req *req, |
2131 | struct nvmet_port *nport, char *traddr) |
2132 | { |
2133 | struct nvmet_tcp_port *port = nport->priv; |
2134 | |
2135 | if (inet_addr_is_any(addr: (struct sockaddr *)&port->addr)) { |
2136 | struct nvmet_tcp_cmd *cmd = |
2137 | container_of(req, struct nvmet_tcp_cmd, req); |
2138 | struct nvmet_tcp_queue *queue = cmd->queue; |
2139 | |
2140 | sprintf(buf: traddr, fmt: "%pISc" , (struct sockaddr *)&queue->sockaddr); |
2141 | } else { |
2142 | memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE); |
2143 | } |
2144 | } |
2145 | |
2146 | static const struct nvmet_fabrics_ops nvmet_tcp_ops = { |
2147 | .owner = THIS_MODULE, |
2148 | .type = NVMF_TRTYPE_TCP, |
2149 | .msdbd = 1, |
2150 | .add_port = nvmet_tcp_add_port, |
2151 | .remove_port = nvmet_tcp_remove_port, |
2152 | .queue_response = nvmet_tcp_queue_response, |
2153 | .delete_ctrl = nvmet_tcp_delete_ctrl, |
2154 | .install_queue = nvmet_tcp_install_queue, |
2155 | .disc_traddr = nvmet_tcp_disc_port_addr, |
2156 | }; |
2157 | |
2158 | static int __init nvmet_tcp_init(void) |
2159 | { |
2160 | int ret; |
2161 | |
2162 | nvmet_tcp_wq = alloc_workqueue(fmt: "nvmet_tcp_wq" , |
2163 | flags: WQ_MEM_RECLAIM | WQ_HIGHPRI, max_active: 0); |
2164 | if (!nvmet_tcp_wq) |
2165 | return -ENOMEM; |
2166 | |
2167 | ret = nvmet_register_transport(ops: &nvmet_tcp_ops); |
2168 | if (ret) |
2169 | goto err; |
2170 | |
2171 | return 0; |
2172 | err: |
2173 | destroy_workqueue(wq: nvmet_tcp_wq); |
2174 | return ret; |
2175 | } |
2176 | |
2177 | static void __exit nvmet_tcp_exit(void) |
2178 | { |
2179 | struct nvmet_tcp_queue *queue; |
2180 | |
2181 | nvmet_unregister_transport(ops: &nvmet_tcp_ops); |
2182 | |
2183 | flush_workqueue(nvmet_wq); |
2184 | mutex_lock(&nvmet_tcp_queue_mutex); |
2185 | list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list) |
2186 | kernel_sock_shutdown(sock: queue->sock, how: SHUT_RDWR); |
2187 | mutex_unlock(lock: &nvmet_tcp_queue_mutex); |
2188 | flush_workqueue(nvmet_wq); |
2189 | |
2190 | destroy_workqueue(wq: nvmet_tcp_wq); |
2191 | } |
2192 | |
2193 | module_init(nvmet_tcp_init); |
2194 | module_exit(nvmet_tcp_exit); |
2195 | |
2196 | MODULE_LICENSE("GPL v2" ); |
2197 | MODULE_ALIAS("nvmet-transport-3" ); /* 3 == NVMF_TRTYPE_TCP */ |
2198 | |