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 #include <trace/events/sock.h>
18
19 #include "nvmet.h"
20
21 #define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
22 #define NVMET_TCP_MAXH2CDATA 0x400000 /* 16M arbitrary limit */
23
param_store_val(const char * str,int * val,int min,int max)24 static int param_store_val(const char *str, int *val, int min, int max)
25 {
26 int ret, new_val;
27
28 ret = kstrtoint(str, 10, &new_val);
29 if (ret)
30 return -EINVAL;
31
32 if (new_val < min || new_val > max)
33 return -EINVAL;
34
35 *val = new_val;
36 return 0;
37 }
38
set_params(const char * str,const struct kernel_param * kp)39 static int set_params(const char *str, const struct kernel_param *kp)
40 {
41 return param_store_val(str, kp->arg, 0, INT_MAX);
42 }
43
44 static const struct kernel_param_ops set_param_ops = {
45 .set = set_params,
46 .get = param_get_int,
47 };
48
49 /* Define the socket priority to use for connections were it is desirable
50 * that the NIC consider performing optimized packet processing or filtering.
51 * A non-zero value being sufficient to indicate general consideration of any
52 * possible optimization. Making it a module param allows for alternative
53 * values that may be unique for some NIC implementations.
54 */
55 static int so_priority;
56 device_param_cb(so_priority, &set_param_ops, &so_priority, 0644);
57 MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority: Default 0");
58
59 /* Define a time period (in usecs) that io_work() shall sample an activated
60 * queue before determining it to be idle. This optional module behavior
61 * can enable NIC solutions that support socket optimized packet processing
62 * using advanced interrupt moderation techniques.
63 */
64 static int idle_poll_period_usecs;
65 device_param_cb(idle_poll_period_usecs, &set_param_ops,
66 &idle_poll_period_usecs, 0644);
67 MODULE_PARM_DESC(idle_poll_period_usecs,
68 "nvmet tcp io_work poll till idle time period in usecs: Default 0");
69
70 #define NVMET_TCP_RECV_BUDGET 8
71 #define NVMET_TCP_SEND_BUDGET 8
72 #define NVMET_TCP_IO_WORK_BUDGET 64
73
74 enum nvmet_tcp_send_state {
75 NVMET_TCP_SEND_DATA_PDU,
76 NVMET_TCP_SEND_DATA,
77 NVMET_TCP_SEND_R2T,
78 NVMET_TCP_SEND_DDGST,
79 NVMET_TCP_SEND_RESPONSE
80 };
81
82 enum nvmet_tcp_recv_state {
83 NVMET_TCP_RECV_PDU,
84 NVMET_TCP_RECV_DATA,
85 NVMET_TCP_RECV_DDGST,
86 NVMET_TCP_RECV_ERR,
87 };
88
89 enum {
90 NVMET_TCP_F_INIT_FAILED = (1 << 0),
91 };
92
93 struct nvmet_tcp_cmd {
94 struct nvmet_tcp_queue *queue;
95 struct nvmet_req req;
96
97 struct nvme_tcp_cmd_pdu *cmd_pdu;
98 struct nvme_tcp_rsp_pdu *rsp_pdu;
99 struct nvme_tcp_data_pdu *data_pdu;
100 struct nvme_tcp_r2t_pdu *r2t_pdu;
101
102 u32 rbytes_done;
103 u32 wbytes_done;
104
105 u32 pdu_len;
106 u32 pdu_recv;
107 int sg_idx;
108 struct msghdr recv_msg;
109 struct bio_vec *iov;
110 u32 flags;
111
112 struct list_head entry;
113 struct llist_node lentry;
114
115 /* send state */
116 u32 offset;
117 struct scatterlist *cur_sg;
118 enum nvmet_tcp_send_state state;
119
120 __le32 exp_ddgst;
121 __le32 recv_ddgst;
122 };
123
124 enum nvmet_tcp_queue_state {
125 NVMET_TCP_Q_CONNECTING,
126 NVMET_TCP_Q_LIVE,
127 NVMET_TCP_Q_DISCONNECTING,
128 };
129
130 struct nvmet_tcp_queue {
131 struct socket *sock;
132 struct nvmet_tcp_port *port;
133 struct work_struct io_work;
134 struct nvmet_cq nvme_cq;
135 struct nvmet_sq nvme_sq;
136
137 /* send state */
138 struct nvmet_tcp_cmd *cmds;
139 unsigned int nr_cmds;
140 struct list_head free_list;
141 struct llist_head resp_list;
142 struct list_head resp_send_list;
143 int send_list_len;
144 struct nvmet_tcp_cmd *snd_cmd;
145
146 /* recv state */
147 int offset;
148 int left;
149 enum nvmet_tcp_recv_state rcv_state;
150 struct nvmet_tcp_cmd *cmd;
151 union nvme_tcp_pdu pdu;
152
153 /* digest state */
154 bool hdr_digest;
155 bool data_digest;
156 struct ahash_request *snd_hash;
157 struct ahash_request *rcv_hash;
158
159 unsigned long poll_end;
160
161 spinlock_t state_lock;
162 enum nvmet_tcp_queue_state state;
163
164 struct sockaddr_storage sockaddr;
165 struct sockaddr_storage sockaddr_peer;
166 struct work_struct release_work;
167
168 int idx;
169 struct list_head queue_list;
170
171 struct nvmet_tcp_cmd connect;
172
173 struct page_frag_cache pf_cache;
174
175 void (*data_ready)(struct sock *);
176 void (*state_change)(struct sock *);
177 void (*write_space)(struct sock *);
178 };
179
180 struct nvmet_tcp_port {
181 struct socket *sock;
182 struct work_struct accept_work;
183 struct nvmet_port *nport;
184 struct sockaddr_storage addr;
185 void (*data_ready)(struct sock *);
186 };
187
188 static DEFINE_IDA(nvmet_tcp_queue_ida);
189 static LIST_HEAD(nvmet_tcp_queue_list);
190 static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
191
192 static struct workqueue_struct *nvmet_tcp_wq;
193 static const struct nvmet_fabrics_ops nvmet_tcp_ops;
194 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
195 static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd);
196
nvmet_tcp_cmd_tag(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * cmd)197 static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
198 struct nvmet_tcp_cmd *cmd)
199 {
200 if (unlikely(!queue->nr_cmds)) {
201 /* We didn't allocate cmds yet, send 0xffff */
202 return USHRT_MAX;
203 }
204
205 return cmd - queue->cmds;
206 }
207
nvmet_tcp_has_data_in(struct nvmet_tcp_cmd * cmd)208 static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
209 {
210 return nvme_is_write(cmd->req.cmd) &&
211 cmd->rbytes_done < cmd->req.transfer_len;
212 }
213
nvmet_tcp_need_data_in(struct nvmet_tcp_cmd * cmd)214 static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
215 {
216 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
217 }
218
nvmet_tcp_need_data_out(struct nvmet_tcp_cmd * cmd)219 static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
220 {
221 return !nvme_is_write(cmd->req.cmd) &&
222 cmd->req.transfer_len > 0 &&
223 !cmd->req.cqe->status;
224 }
225
nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd * cmd)226 static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
227 {
228 return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
229 !cmd->rbytes_done;
230 }
231
232 static inline struct nvmet_tcp_cmd *
nvmet_tcp_get_cmd(struct nvmet_tcp_queue * queue)233 nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
234 {
235 struct nvmet_tcp_cmd *cmd;
236
237 cmd = list_first_entry_or_null(&queue->free_list,
238 struct nvmet_tcp_cmd, entry);
239 if (!cmd)
240 return NULL;
241 list_del_init(&cmd->entry);
242
243 cmd->rbytes_done = cmd->wbytes_done = 0;
244 cmd->pdu_len = 0;
245 cmd->pdu_recv = 0;
246 cmd->iov = NULL;
247 cmd->flags = 0;
248 return cmd;
249 }
250
nvmet_tcp_put_cmd(struct nvmet_tcp_cmd * cmd)251 static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
252 {
253 if (unlikely(cmd == &cmd->queue->connect))
254 return;
255
256 list_add_tail(&cmd->entry, &cmd->queue->free_list);
257 }
258
queue_cpu(struct nvmet_tcp_queue * queue)259 static inline int queue_cpu(struct nvmet_tcp_queue *queue)
260 {
261 return queue->sock->sk->sk_incoming_cpu;
262 }
263
nvmet_tcp_hdgst_len(struct nvmet_tcp_queue * queue)264 static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
265 {
266 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
267 }
268
nvmet_tcp_ddgst_len(struct nvmet_tcp_queue * queue)269 static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
270 {
271 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
272 }
273
nvmet_tcp_hdgst(struct ahash_request * hash,void * pdu,size_t len)274 static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
275 void *pdu, size_t len)
276 {
277 struct scatterlist sg;
278
279 sg_init_one(&sg, pdu, len);
280 ahash_request_set_crypt(hash, &sg, pdu + len, len);
281 crypto_ahash_digest(hash);
282 }
283
nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue * queue,void * pdu,size_t len)284 static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
285 void *pdu, size_t len)
286 {
287 struct nvme_tcp_hdr *hdr = pdu;
288 __le32 recv_digest;
289 __le32 exp_digest;
290
291 if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
292 pr_err("queue %d: header digest enabled but no header digest\n",
293 queue->idx);
294 return -EPROTO;
295 }
296
297 recv_digest = *(__le32 *)(pdu + hdr->hlen);
298 nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
299 exp_digest = *(__le32 *)(pdu + hdr->hlen);
300 if (recv_digest != exp_digest) {
301 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
302 queue->idx, le32_to_cpu(recv_digest),
303 le32_to_cpu(exp_digest));
304 return -EPROTO;
305 }
306
307 return 0;
308 }
309
nvmet_tcp_check_ddgst(struct nvmet_tcp_queue * queue,void * pdu)310 static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
311 {
312 struct nvme_tcp_hdr *hdr = pdu;
313 u8 digest_len = nvmet_tcp_hdgst_len(queue);
314 u32 len;
315
316 len = le32_to_cpu(hdr->plen) - hdr->hlen -
317 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
318
319 if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
320 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
321 return -EPROTO;
322 }
323
324 return 0;
325 }
326
nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd * cmd)327 static void nvmet_tcp_free_cmd_buffers(struct nvmet_tcp_cmd *cmd)
328 {
329 kfree(cmd->iov);
330 sgl_free(cmd->req.sg);
331 cmd->iov = NULL;
332 cmd->req.sg = NULL;
333 }
334
nvmet_tcp_build_pdu_iovec(struct nvmet_tcp_cmd * cmd)335 static void nvmet_tcp_build_pdu_iovec(struct nvmet_tcp_cmd *cmd)
336 {
337 struct bio_vec *iov = cmd->iov;
338 struct scatterlist *sg;
339 u32 length, offset, sg_offset;
340 int nr_pages;
341
342 length = cmd->pdu_len;
343 nr_pages = DIV_ROUND_UP(length, PAGE_SIZE);
344 offset = cmd->rbytes_done;
345 cmd->sg_idx = offset / PAGE_SIZE;
346 sg_offset = offset % PAGE_SIZE;
347 sg = &cmd->req.sg[cmd->sg_idx];
348
349 while (length) {
350 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
351
352 bvec_set_page(iov, sg_page(sg), iov_len,
353 sg->offset + sg_offset);
354
355 length -= iov_len;
356 sg = sg_next(sg);
357 iov++;
358 sg_offset = 0;
359 }
360
361 iov_iter_bvec(&cmd->recv_msg.msg_iter, ITER_DEST, cmd->iov,
362 nr_pages, cmd->pdu_len);
363 }
364
nvmet_tcp_fatal_error(struct nvmet_tcp_queue * queue)365 static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
366 {
367 queue->rcv_state = NVMET_TCP_RECV_ERR;
368 if (queue->nvme_sq.ctrl)
369 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
370 else
371 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
372 }
373
nvmet_tcp_socket_error(struct nvmet_tcp_queue * queue,int status)374 static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
375 {
376 queue->rcv_state = NVMET_TCP_RECV_ERR;
377 if (status == -EPIPE || status == -ECONNRESET)
378 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
379 else
380 nvmet_tcp_fatal_error(queue);
381 }
382
nvmet_tcp_map_data(struct nvmet_tcp_cmd * cmd)383 static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
384 {
385 struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
386 u32 len = le32_to_cpu(sgl->length);
387
388 if (!len)
389 return 0;
390
391 if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
392 NVME_SGL_FMT_OFFSET)) {
393 if (!nvme_is_write(cmd->req.cmd))
394 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
395
396 if (len > cmd->req.port->inline_data_size)
397 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
398 cmd->pdu_len = len;
399 }
400 cmd->req.transfer_len += len;
401
402 cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
403 if (!cmd->req.sg)
404 return NVME_SC_INTERNAL;
405 cmd->cur_sg = cmd->req.sg;
406
407 if (nvmet_tcp_has_data_in(cmd)) {
408 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
409 sizeof(*cmd->iov), GFP_KERNEL);
410 if (!cmd->iov)
411 goto err;
412 }
413
414 return 0;
415 err:
416 nvmet_tcp_free_cmd_buffers(cmd);
417 return NVME_SC_INTERNAL;
418 }
419
nvmet_tcp_calc_ddgst(struct ahash_request * hash,struct nvmet_tcp_cmd * cmd)420 static void nvmet_tcp_calc_ddgst(struct ahash_request *hash,
421 struct nvmet_tcp_cmd *cmd)
422 {
423 ahash_request_set_crypt(hash, cmd->req.sg,
424 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
425 crypto_ahash_digest(hash);
426 }
427
nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd * cmd)428 static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
429 {
430 struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
431 struct nvmet_tcp_queue *queue = cmd->queue;
432 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
433 u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
434
435 cmd->offset = 0;
436 cmd->state = NVMET_TCP_SEND_DATA_PDU;
437
438 pdu->hdr.type = nvme_tcp_c2h_data;
439 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
440 NVME_TCP_F_DATA_SUCCESS : 0);
441 pdu->hdr.hlen = sizeof(*pdu);
442 pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
443 pdu->hdr.plen =
444 cpu_to_le32(pdu->hdr.hlen + hdgst +
445 cmd->req.transfer_len + ddgst);
446 pdu->command_id = cmd->req.cqe->command_id;
447 pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
448 pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
449
450 if (queue->data_digest) {
451 pdu->hdr.flags |= NVME_TCP_F_DDGST;
452 nvmet_tcp_calc_ddgst(queue->snd_hash, cmd);
453 }
454
455 if (cmd->queue->hdr_digest) {
456 pdu->hdr.flags |= NVME_TCP_F_HDGST;
457 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
458 }
459 }
460
nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd * cmd)461 static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
462 {
463 struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
464 struct nvmet_tcp_queue *queue = cmd->queue;
465 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
466
467 cmd->offset = 0;
468 cmd->state = NVMET_TCP_SEND_R2T;
469
470 pdu->hdr.type = nvme_tcp_r2t;
471 pdu->hdr.flags = 0;
472 pdu->hdr.hlen = sizeof(*pdu);
473 pdu->hdr.pdo = 0;
474 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
475
476 pdu->command_id = cmd->req.cmd->common.command_id;
477 pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
478 pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
479 pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
480 if (cmd->queue->hdr_digest) {
481 pdu->hdr.flags |= NVME_TCP_F_HDGST;
482 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
483 }
484 }
485
nvmet_setup_response_pdu(struct nvmet_tcp_cmd * cmd)486 static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
487 {
488 struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
489 struct nvmet_tcp_queue *queue = cmd->queue;
490 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
491
492 cmd->offset = 0;
493 cmd->state = NVMET_TCP_SEND_RESPONSE;
494
495 pdu->hdr.type = nvme_tcp_rsp;
496 pdu->hdr.flags = 0;
497 pdu->hdr.hlen = sizeof(*pdu);
498 pdu->hdr.pdo = 0;
499 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
500 if (cmd->queue->hdr_digest) {
501 pdu->hdr.flags |= NVME_TCP_F_HDGST;
502 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
503 }
504 }
505
nvmet_tcp_process_resp_list(struct nvmet_tcp_queue * queue)506 static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
507 {
508 struct llist_node *node;
509 struct nvmet_tcp_cmd *cmd;
510
511 for (node = llist_del_all(&queue->resp_list); node; node = node->next) {
512 cmd = llist_entry(node, struct nvmet_tcp_cmd, lentry);
513 list_add(&cmd->entry, &queue->resp_send_list);
514 queue->send_list_len++;
515 }
516 }
517
nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue * queue)518 static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
519 {
520 queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
521 struct nvmet_tcp_cmd, entry);
522 if (!queue->snd_cmd) {
523 nvmet_tcp_process_resp_list(queue);
524 queue->snd_cmd =
525 list_first_entry_or_null(&queue->resp_send_list,
526 struct nvmet_tcp_cmd, entry);
527 if (unlikely(!queue->snd_cmd))
528 return NULL;
529 }
530
531 list_del_init(&queue->snd_cmd->entry);
532 queue->send_list_len--;
533
534 if (nvmet_tcp_need_data_out(queue->snd_cmd))
535 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
536 else if (nvmet_tcp_need_data_in(queue->snd_cmd))
537 nvmet_setup_r2t_pdu(queue->snd_cmd);
538 else
539 nvmet_setup_response_pdu(queue->snd_cmd);
540
541 return queue->snd_cmd;
542 }
543
nvmet_tcp_queue_response(struct nvmet_req * req)544 static void nvmet_tcp_queue_response(struct nvmet_req *req)
545 {
546 struct nvmet_tcp_cmd *cmd =
547 container_of(req, struct nvmet_tcp_cmd, req);
548 struct nvmet_tcp_queue *queue = cmd->queue;
549 struct nvme_sgl_desc *sgl;
550 u32 len;
551
552 if (unlikely(cmd == queue->cmd)) {
553 sgl = &cmd->req.cmd->common.dptr.sgl;
554 len = le32_to_cpu(sgl->length);
555
556 /*
557 * Wait for inline data before processing the response.
558 * Avoid using helpers, this might happen before
559 * nvmet_req_init is completed.
560 */
561 if (queue->rcv_state == NVMET_TCP_RECV_PDU &&
562 len && len <= cmd->req.port->inline_data_size &&
563 nvme_is_write(cmd->req.cmd))
564 return;
565 }
566
567 llist_add(&cmd->lentry, &queue->resp_list);
568 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &cmd->queue->io_work);
569 }
570
nvmet_tcp_execute_request(struct nvmet_tcp_cmd * cmd)571 static void nvmet_tcp_execute_request(struct nvmet_tcp_cmd *cmd)
572 {
573 if (unlikely(cmd->flags & NVMET_TCP_F_INIT_FAILED))
574 nvmet_tcp_queue_response(&cmd->req);
575 else
576 cmd->req.execute(&cmd->req);
577 }
578
nvmet_try_send_data_pdu(struct nvmet_tcp_cmd * cmd)579 static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
580 {
581 struct msghdr msg = {
582 .msg_flags = MSG_DONTWAIT | MSG_MORE | MSG_SPLICE_PAGES,
583 };
584 struct bio_vec bvec;
585 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
586 int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
587 int ret;
588
589 bvec_set_virt(&bvec, (void *)cmd->data_pdu + cmd->offset, left);
590 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, left);
591 ret = sock_sendmsg(cmd->queue->sock, &msg);
592 if (ret <= 0)
593 return ret;
594
595 cmd->offset += ret;
596 left -= ret;
597
598 if (left)
599 return -EAGAIN;
600
601 cmd->state = NVMET_TCP_SEND_DATA;
602 cmd->offset = 0;
603 return 1;
604 }
605
nvmet_try_send_data(struct nvmet_tcp_cmd * cmd,bool last_in_batch)606 static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
607 {
608 struct nvmet_tcp_queue *queue = cmd->queue;
609 int ret;
610
611 while (cmd->cur_sg) {
612 struct msghdr msg = {
613 .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES,
614 };
615 struct page *page = sg_page(cmd->cur_sg);
616 struct bio_vec bvec;
617 u32 left = cmd->cur_sg->length - cmd->offset;
618
619 if ((!last_in_batch && cmd->queue->send_list_len) ||
620 cmd->wbytes_done + left < cmd->req.transfer_len ||
621 queue->data_digest || !queue->nvme_sq.sqhd_disabled)
622 msg.msg_flags |= MSG_MORE;
623
624 bvec_set_page(&bvec, page, left, cmd->offset);
625 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, left);
626 ret = sock_sendmsg(cmd->queue->sock, &msg);
627 if (ret <= 0)
628 return ret;
629
630 cmd->offset += ret;
631 cmd->wbytes_done += ret;
632
633 /* Done with sg?*/
634 if (cmd->offset == cmd->cur_sg->length) {
635 cmd->cur_sg = sg_next(cmd->cur_sg);
636 cmd->offset = 0;
637 }
638 }
639
640 if (queue->data_digest) {
641 cmd->state = NVMET_TCP_SEND_DDGST;
642 cmd->offset = 0;
643 } else {
644 if (queue->nvme_sq.sqhd_disabled) {
645 cmd->queue->snd_cmd = NULL;
646 nvmet_tcp_put_cmd(cmd);
647 } else {
648 nvmet_setup_response_pdu(cmd);
649 }
650 }
651
652 if (queue->nvme_sq.sqhd_disabled)
653 nvmet_tcp_free_cmd_buffers(cmd);
654
655 return 1;
656
657 }
658
nvmet_try_send_response(struct nvmet_tcp_cmd * cmd,bool last_in_batch)659 static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
660 bool last_in_batch)
661 {
662 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES, };
663 struct bio_vec bvec;
664 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
665 int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
666 int ret;
667
668 if (!last_in_batch && cmd->queue->send_list_len)
669 msg.msg_flags |= MSG_MORE;
670 else
671 msg.msg_flags |= MSG_EOR;
672
673 bvec_set_virt(&bvec, (void *)cmd->rsp_pdu + cmd->offset, left);
674 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, left);
675 ret = sock_sendmsg(cmd->queue->sock, &msg);
676 if (ret <= 0)
677 return ret;
678 cmd->offset += ret;
679 left -= ret;
680
681 if (left)
682 return -EAGAIN;
683
684 nvmet_tcp_free_cmd_buffers(cmd);
685 cmd->queue->snd_cmd = NULL;
686 nvmet_tcp_put_cmd(cmd);
687 return 1;
688 }
689
nvmet_try_send_r2t(struct nvmet_tcp_cmd * cmd,bool last_in_batch)690 static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
691 {
692 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_SPLICE_PAGES, };
693 struct bio_vec bvec;
694 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
695 int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
696 int ret;
697
698 if (!last_in_batch && cmd->queue->send_list_len)
699 msg.msg_flags |= MSG_MORE;
700 else
701 msg.msg_flags |= MSG_EOR;
702
703 bvec_set_virt(&bvec, (void *)cmd->r2t_pdu + cmd->offset, left);
704 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, left);
705 ret = sock_sendmsg(cmd->queue->sock, &msg);
706 if (ret <= 0)
707 return ret;
708 cmd->offset += ret;
709 left -= ret;
710
711 if (left)
712 return -EAGAIN;
713
714 cmd->queue->snd_cmd = NULL;
715 return 1;
716 }
717
nvmet_try_send_ddgst(struct nvmet_tcp_cmd * cmd,bool last_in_batch)718 static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
719 {
720 struct nvmet_tcp_queue *queue = cmd->queue;
721 int left = NVME_TCP_DIGEST_LENGTH - cmd->offset;
722 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
723 struct kvec iov = {
724 .iov_base = (u8 *)&cmd->exp_ddgst + cmd->offset,
725 .iov_len = left
726 };
727 int ret;
728
729 if (!last_in_batch && cmd->queue->send_list_len)
730 msg.msg_flags |= MSG_MORE;
731 else
732 msg.msg_flags |= MSG_EOR;
733
734 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
735 if (unlikely(ret <= 0))
736 return ret;
737
738 cmd->offset += ret;
739 left -= ret;
740
741 if (left)
742 return -EAGAIN;
743
744 if (queue->nvme_sq.sqhd_disabled) {
745 cmd->queue->snd_cmd = NULL;
746 nvmet_tcp_put_cmd(cmd);
747 } else {
748 nvmet_setup_response_pdu(cmd);
749 }
750 return 1;
751 }
752
nvmet_tcp_try_send_one(struct nvmet_tcp_queue * queue,bool last_in_batch)753 static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
754 bool last_in_batch)
755 {
756 struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
757 int ret = 0;
758
759 if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
760 cmd = nvmet_tcp_fetch_cmd(queue);
761 if (unlikely(!cmd))
762 return 0;
763 }
764
765 if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
766 ret = nvmet_try_send_data_pdu(cmd);
767 if (ret <= 0)
768 goto done_send;
769 }
770
771 if (cmd->state == NVMET_TCP_SEND_DATA) {
772 ret = nvmet_try_send_data(cmd, last_in_batch);
773 if (ret <= 0)
774 goto done_send;
775 }
776
777 if (cmd->state == NVMET_TCP_SEND_DDGST) {
778 ret = nvmet_try_send_ddgst(cmd, last_in_batch);
779 if (ret <= 0)
780 goto done_send;
781 }
782
783 if (cmd->state == NVMET_TCP_SEND_R2T) {
784 ret = nvmet_try_send_r2t(cmd, last_in_batch);
785 if (ret <= 0)
786 goto done_send;
787 }
788
789 if (cmd->state == NVMET_TCP_SEND_RESPONSE)
790 ret = nvmet_try_send_response(cmd, last_in_batch);
791
792 done_send:
793 if (ret < 0) {
794 if (ret == -EAGAIN)
795 return 0;
796 return ret;
797 }
798
799 return 1;
800 }
801
nvmet_tcp_try_send(struct nvmet_tcp_queue * queue,int budget,int * sends)802 static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
803 int budget, int *sends)
804 {
805 int i, ret = 0;
806
807 for (i = 0; i < budget; i++) {
808 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
809 if (unlikely(ret < 0)) {
810 nvmet_tcp_socket_error(queue, ret);
811 goto done;
812 } else if (ret == 0) {
813 break;
814 }
815 (*sends)++;
816 }
817 done:
818 return ret;
819 }
820
nvmet_prepare_receive_pdu(struct nvmet_tcp_queue * queue)821 static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
822 {
823 queue->offset = 0;
824 queue->left = sizeof(struct nvme_tcp_hdr);
825 queue->cmd = NULL;
826 queue->rcv_state = NVMET_TCP_RECV_PDU;
827 }
828
nvmet_tcp_free_crypto(struct nvmet_tcp_queue * queue)829 static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
830 {
831 struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
832
833 ahash_request_free(queue->rcv_hash);
834 ahash_request_free(queue->snd_hash);
835 crypto_free_ahash(tfm);
836 }
837
nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue * queue)838 static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
839 {
840 struct crypto_ahash *tfm;
841
842 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
843 if (IS_ERR(tfm))
844 return PTR_ERR(tfm);
845
846 queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
847 if (!queue->snd_hash)
848 goto free_tfm;
849 ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
850
851 queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
852 if (!queue->rcv_hash)
853 goto free_snd_hash;
854 ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
855
856 return 0;
857 free_snd_hash:
858 ahash_request_free(queue->snd_hash);
859 free_tfm:
860 crypto_free_ahash(tfm);
861 return -ENOMEM;
862 }
863
864
nvmet_tcp_handle_icreq(struct nvmet_tcp_queue * queue)865 static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
866 {
867 struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
868 struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
869 struct msghdr msg = {};
870 struct kvec iov;
871 int ret;
872
873 if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
874 pr_err("bad nvme-tcp pdu length (%d)\n",
875 le32_to_cpu(icreq->hdr.plen));
876 nvmet_tcp_fatal_error(queue);
877 }
878
879 if (icreq->pfv != NVME_TCP_PFV_1_0) {
880 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
881 return -EPROTO;
882 }
883
884 if (icreq->hpda != 0) {
885 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
886 icreq->hpda);
887 return -EPROTO;
888 }
889
890 queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
891 queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
892 if (queue->hdr_digest || queue->data_digest) {
893 ret = nvmet_tcp_alloc_crypto(queue);
894 if (ret)
895 return ret;
896 }
897
898 memset(icresp, 0, sizeof(*icresp));
899 icresp->hdr.type = nvme_tcp_icresp;
900 icresp->hdr.hlen = sizeof(*icresp);
901 icresp->hdr.pdo = 0;
902 icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
903 icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
904 icresp->maxdata = cpu_to_le32(NVMET_TCP_MAXH2CDATA);
905 icresp->cpda = 0;
906 if (queue->hdr_digest)
907 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
908 if (queue->data_digest)
909 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
910
911 iov.iov_base = icresp;
912 iov.iov_len = sizeof(*icresp);
913 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
914 if (ret < 0)
915 return ret; /* queue removal will cleanup */
916
917 queue->state = NVMET_TCP_Q_LIVE;
918 nvmet_prepare_receive_pdu(queue);
919 return 0;
920 }
921
nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * cmd,struct nvmet_req * req)922 static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
923 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
924 {
925 size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
926 int ret;
927
928 /*
929 * This command has not been processed yet, hence we are trying to
930 * figure out if there is still pending data left to receive. If
931 * we don't, we can simply prepare for the next pdu and bail out,
932 * otherwise we will need to prepare a buffer and receive the
933 * stale data before continuing forward.
934 */
935 if (!nvme_is_write(cmd->req.cmd) || !data_len ||
936 data_len > cmd->req.port->inline_data_size) {
937 nvmet_prepare_receive_pdu(queue);
938 return;
939 }
940
941 ret = nvmet_tcp_map_data(cmd);
942 if (unlikely(ret)) {
943 pr_err("queue %d: failed to map data\n", queue->idx);
944 nvmet_tcp_fatal_error(queue);
945 return;
946 }
947
948 queue->rcv_state = NVMET_TCP_RECV_DATA;
949 nvmet_tcp_build_pdu_iovec(cmd);
950 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
951 }
952
nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue * queue)953 static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
954 {
955 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
956 struct nvmet_tcp_cmd *cmd;
957 unsigned int exp_data_len;
958
959 if (likely(queue->nr_cmds)) {
960 if (unlikely(data->ttag >= queue->nr_cmds)) {
961 pr_err("queue %d: received out of bound ttag %u, nr_cmds %u\n",
962 queue->idx, data->ttag, queue->nr_cmds);
963 nvmet_tcp_fatal_error(queue);
964 return -EPROTO;
965 }
966 cmd = &queue->cmds[data->ttag];
967 } else {
968 cmd = &queue->connect;
969 }
970
971 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
972 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
973 data->ttag, le32_to_cpu(data->data_offset),
974 cmd->rbytes_done);
975 /* FIXME: use path and transport errors */
976 nvmet_tcp_fatal_error(queue);
977 return -EPROTO;
978 }
979
980 exp_data_len = le32_to_cpu(data->hdr.plen) -
981 nvmet_tcp_hdgst_len(queue) -
982 nvmet_tcp_ddgst_len(queue) -
983 sizeof(*data);
984
985 cmd->pdu_len = le32_to_cpu(data->data_length);
986 if (unlikely(cmd->pdu_len != exp_data_len ||
987 cmd->pdu_len == 0 ||
988 cmd->pdu_len > NVMET_TCP_MAXH2CDATA)) {
989 pr_err("H2CData PDU len %u is invalid\n", cmd->pdu_len);
990 /* FIXME: use proper transport errors */
991 nvmet_tcp_fatal_error(queue);
992 return -EPROTO;
993 }
994 cmd->pdu_recv = 0;
995 nvmet_tcp_build_pdu_iovec(cmd);
996 queue->cmd = cmd;
997 queue->rcv_state = NVMET_TCP_RECV_DATA;
998
999 return 0;
1000 }
1001
nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue * queue)1002 static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
1003 {
1004 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
1005 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
1006 struct nvmet_req *req;
1007 int ret;
1008
1009 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1010 if (hdr->type != nvme_tcp_icreq) {
1011 pr_err("unexpected pdu type (%d) before icreq\n",
1012 hdr->type);
1013 nvmet_tcp_fatal_error(queue);
1014 return -EPROTO;
1015 }
1016 return nvmet_tcp_handle_icreq(queue);
1017 }
1018
1019 if (unlikely(hdr->type == nvme_tcp_icreq)) {
1020 pr_err("queue %d: received icreq pdu in state %d\n",
1021 queue->idx, queue->state);
1022 nvmet_tcp_fatal_error(queue);
1023 return -EPROTO;
1024 }
1025
1026 if (hdr->type == nvme_tcp_h2c_data) {
1027 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
1028 if (unlikely(ret))
1029 return ret;
1030 return 0;
1031 }
1032
1033 queue->cmd = nvmet_tcp_get_cmd(queue);
1034 if (unlikely(!queue->cmd)) {
1035 /* This should never happen */
1036 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
1037 queue->idx, queue->nr_cmds, queue->send_list_len,
1038 nvme_cmd->common.opcode);
1039 nvmet_tcp_fatal_error(queue);
1040 return -ENOMEM;
1041 }
1042
1043 req = &queue->cmd->req;
1044 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
1045
1046 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
1047 &queue->nvme_sq, &nvmet_tcp_ops))) {
1048 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
1049 req->cmd, req->cmd->common.command_id,
1050 req->cmd->common.opcode,
1051 le32_to_cpu(req->cmd->common.dptr.sgl.length));
1052
1053 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
1054 return 0;
1055 }
1056
1057 ret = nvmet_tcp_map_data(queue->cmd);
1058 if (unlikely(ret)) {
1059 pr_err("queue %d: failed to map data\n", queue->idx);
1060 if (nvmet_tcp_has_inline_data(queue->cmd))
1061 nvmet_tcp_fatal_error(queue);
1062 else
1063 nvmet_req_complete(req, ret);
1064 ret = -EAGAIN;
1065 goto out;
1066 }
1067
1068 if (nvmet_tcp_need_data_in(queue->cmd)) {
1069 if (nvmet_tcp_has_inline_data(queue->cmd)) {
1070 queue->rcv_state = NVMET_TCP_RECV_DATA;
1071 nvmet_tcp_build_pdu_iovec(queue->cmd);
1072 return 0;
1073 }
1074 /* send back R2T */
1075 nvmet_tcp_queue_response(&queue->cmd->req);
1076 goto out;
1077 }
1078
1079 queue->cmd->req.execute(&queue->cmd->req);
1080 out:
1081 nvmet_prepare_receive_pdu(queue);
1082 return ret;
1083 }
1084
1085 static const u8 nvme_tcp_pdu_sizes[] = {
1086 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
1087 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
1088 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
1089 };
1090
nvmet_tcp_pdu_size(u8 type)1091 static inline u8 nvmet_tcp_pdu_size(u8 type)
1092 {
1093 size_t idx = type;
1094
1095 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
1096 nvme_tcp_pdu_sizes[idx]) ?
1097 nvme_tcp_pdu_sizes[idx] : 0;
1098 }
1099
nvmet_tcp_pdu_valid(u8 type)1100 static inline bool nvmet_tcp_pdu_valid(u8 type)
1101 {
1102 switch (type) {
1103 case nvme_tcp_icreq:
1104 case nvme_tcp_cmd:
1105 case nvme_tcp_h2c_data:
1106 /* fallthru */
1107 return true;
1108 }
1109
1110 return false;
1111 }
1112
nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue * queue)1113 static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
1114 {
1115 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
1116 int len;
1117 struct kvec iov;
1118 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1119
1120 recv:
1121 iov.iov_base = (void *)&queue->pdu + queue->offset;
1122 iov.iov_len = queue->left;
1123 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1124 iov.iov_len, msg.msg_flags);
1125 if (unlikely(len < 0))
1126 return len;
1127
1128 queue->offset += len;
1129 queue->left -= len;
1130 if (queue->left)
1131 return -EAGAIN;
1132
1133 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
1134 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1135
1136 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
1137 pr_err("unexpected pdu type %d\n", hdr->type);
1138 nvmet_tcp_fatal_error(queue);
1139 return -EIO;
1140 }
1141
1142 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
1143 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1144 return -EIO;
1145 }
1146
1147 queue->left = hdr->hlen - queue->offset + hdgst;
1148 goto recv;
1149 }
1150
1151 if (queue->hdr_digest &&
1152 nvmet_tcp_verify_hdgst(queue, &queue->pdu, hdr->hlen)) {
1153 nvmet_tcp_fatal_error(queue); /* fatal */
1154 return -EPROTO;
1155 }
1156
1157 if (queue->data_digest &&
1158 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1159 nvmet_tcp_fatal_error(queue); /* fatal */
1160 return -EPROTO;
1161 }
1162
1163 return nvmet_tcp_done_recv_pdu(queue);
1164 }
1165
nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd * cmd)1166 static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1167 {
1168 struct nvmet_tcp_queue *queue = cmd->queue;
1169
1170 nvmet_tcp_calc_ddgst(queue->rcv_hash, cmd);
1171 queue->offset = 0;
1172 queue->left = NVME_TCP_DIGEST_LENGTH;
1173 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1174 }
1175
nvmet_tcp_try_recv_data(struct nvmet_tcp_queue * queue)1176 static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1177 {
1178 struct nvmet_tcp_cmd *cmd = queue->cmd;
1179 int ret;
1180
1181 while (msg_data_left(&cmd->recv_msg)) {
1182 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1183 cmd->recv_msg.msg_flags);
1184 if (ret <= 0)
1185 return ret;
1186
1187 cmd->pdu_recv += ret;
1188 cmd->rbytes_done += ret;
1189 }
1190
1191 if (queue->data_digest) {
1192 nvmet_tcp_prep_recv_ddgst(cmd);
1193 return 0;
1194 }
1195
1196 if (cmd->rbytes_done == cmd->req.transfer_len)
1197 nvmet_tcp_execute_request(cmd);
1198
1199 nvmet_prepare_receive_pdu(queue);
1200 return 0;
1201 }
1202
nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue * queue)1203 static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1204 {
1205 struct nvmet_tcp_cmd *cmd = queue->cmd;
1206 int ret;
1207 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1208 struct kvec iov = {
1209 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1210 .iov_len = queue->left
1211 };
1212
1213 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1214 iov.iov_len, msg.msg_flags);
1215 if (unlikely(ret < 0))
1216 return ret;
1217
1218 queue->offset += ret;
1219 queue->left -= ret;
1220 if (queue->left)
1221 return -EAGAIN;
1222
1223 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1224 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1225 queue->idx, cmd->req.cmd->common.command_id,
1226 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1227 le32_to_cpu(cmd->exp_ddgst));
1228 nvmet_req_uninit(&cmd->req);
1229 nvmet_tcp_free_cmd_buffers(cmd);
1230 nvmet_tcp_fatal_error(queue);
1231 ret = -EPROTO;
1232 goto out;
1233 }
1234
1235 if (cmd->rbytes_done == cmd->req.transfer_len)
1236 nvmet_tcp_execute_request(cmd);
1237
1238 ret = 0;
1239 out:
1240 nvmet_prepare_receive_pdu(queue);
1241 return ret;
1242 }
1243
nvmet_tcp_try_recv_one(struct nvmet_tcp_queue * queue)1244 static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1245 {
1246 int result = 0;
1247
1248 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1249 return 0;
1250
1251 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1252 result = nvmet_tcp_try_recv_pdu(queue);
1253 if (result != 0)
1254 goto done_recv;
1255 }
1256
1257 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1258 result = nvmet_tcp_try_recv_data(queue);
1259 if (result != 0)
1260 goto done_recv;
1261 }
1262
1263 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1264 result = nvmet_tcp_try_recv_ddgst(queue);
1265 if (result != 0)
1266 goto done_recv;
1267 }
1268
1269 done_recv:
1270 if (result < 0) {
1271 if (result == -EAGAIN)
1272 return 0;
1273 return result;
1274 }
1275 return 1;
1276 }
1277
nvmet_tcp_try_recv(struct nvmet_tcp_queue * queue,int budget,int * recvs)1278 static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1279 int budget, int *recvs)
1280 {
1281 int i, ret = 0;
1282
1283 for (i = 0; i < budget; i++) {
1284 ret = nvmet_tcp_try_recv_one(queue);
1285 if (unlikely(ret < 0)) {
1286 nvmet_tcp_socket_error(queue, ret);
1287 goto done;
1288 } else if (ret == 0) {
1289 break;
1290 }
1291 (*recvs)++;
1292 }
1293 done:
1294 return ret;
1295 }
1296
nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue * queue)1297 static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1298 {
1299 spin_lock(&queue->state_lock);
1300 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1301 queue->state = NVMET_TCP_Q_DISCONNECTING;
1302 queue_work(nvmet_wq, &queue->release_work);
1303 }
1304 spin_unlock(&queue->state_lock);
1305 }
1306
nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue * queue)1307 static inline void nvmet_tcp_arm_queue_deadline(struct nvmet_tcp_queue *queue)
1308 {
1309 queue->poll_end = jiffies + usecs_to_jiffies(idle_poll_period_usecs);
1310 }
1311
nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue * queue,int ops)1312 static bool nvmet_tcp_check_queue_deadline(struct nvmet_tcp_queue *queue,
1313 int ops)
1314 {
1315 if (!idle_poll_period_usecs)
1316 return false;
1317
1318 if (ops)
1319 nvmet_tcp_arm_queue_deadline(queue);
1320
1321 return !time_after(jiffies, queue->poll_end);
1322 }
1323
nvmet_tcp_io_work(struct work_struct * w)1324 static void nvmet_tcp_io_work(struct work_struct *w)
1325 {
1326 struct nvmet_tcp_queue *queue =
1327 container_of(w, struct nvmet_tcp_queue, io_work);
1328 bool pending;
1329 int ret, ops = 0;
1330
1331 do {
1332 pending = false;
1333
1334 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1335 if (ret > 0)
1336 pending = true;
1337 else if (ret < 0)
1338 return;
1339
1340 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1341 if (ret > 0)
1342 pending = true;
1343 else if (ret < 0)
1344 return;
1345
1346 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1347
1348 /*
1349 * Requeue the worker if idle deadline period is in progress or any
1350 * ops activity was recorded during the do-while loop above.
1351 */
1352 if (nvmet_tcp_check_queue_deadline(queue, ops) || pending)
1353 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1354 }
1355
nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue * queue,struct nvmet_tcp_cmd * c)1356 static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1357 struct nvmet_tcp_cmd *c)
1358 {
1359 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1360
1361 c->queue = queue;
1362 c->req.port = queue->port->nport;
1363
1364 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1365 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1366 if (!c->cmd_pdu)
1367 return -ENOMEM;
1368 c->req.cmd = &c->cmd_pdu->cmd;
1369
1370 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1371 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1372 if (!c->rsp_pdu)
1373 goto out_free_cmd;
1374 c->req.cqe = &c->rsp_pdu->cqe;
1375
1376 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1377 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1378 if (!c->data_pdu)
1379 goto out_free_rsp;
1380
1381 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1382 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1383 if (!c->r2t_pdu)
1384 goto out_free_data;
1385
1386 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1387
1388 list_add_tail(&c->entry, &queue->free_list);
1389
1390 return 0;
1391 out_free_data:
1392 page_frag_free(c->data_pdu);
1393 out_free_rsp:
1394 page_frag_free(c->rsp_pdu);
1395 out_free_cmd:
1396 page_frag_free(c->cmd_pdu);
1397 return -ENOMEM;
1398 }
1399
nvmet_tcp_free_cmd(struct nvmet_tcp_cmd * c)1400 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1401 {
1402 page_frag_free(c->r2t_pdu);
1403 page_frag_free(c->data_pdu);
1404 page_frag_free(c->rsp_pdu);
1405 page_frag_free(c->cmd_pdu);
1406 }
1407
nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue * queue)1408 static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1409 {
1410 struct nvmet_tcp_cmd *cmds;
1411 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1412
1413 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1414 if (!cmds)
1415 goto out;
1416
1417 for (i = 0; i < nr_cmds; i++) {
1418 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1419 if (ret)
1420 goto out_free;
1421 }
1422
1423 queue->cmds = cmds;
1424
1425 return 0;
1426 out_free:
1427 while (--i >= 0)
1428 nvmet_tcp_free_cmd(cmds + i);
1429 kfree(cmds);
1430 out:
1431 return ret;
1432 }
1433
nvmet_tcp_free_cmds(struct nvmet_tcp_queue * queue)1434 static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1435 {
1436 struct nvmet_tcp_cmd *cmds = queue->cmds;
1437 int i;
1438
1439 for (i = 0; i < queue->nr_cmds; i++)
1440 nvmet_tcp_free_cmd(cmds + i);
1441
1442 nvmet_tcp_free_cmd(&queue->connect);
1443 kfree(cmds);
1444 }
1445
nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue * queue)1446 static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1447 {
1448 struct socket *sock = queue->sock;
1449
1450 write_lock_bh(&sock->sk->sk_callback_lock);
1451 sock->sk->sk_data_ready = queue->data_ready;
1452 sock->sk->sk_state_change = queue->state_change;
1453 sock->sk->sk_write_space = queue->write_space;
1454 sock->sk->sk_user_data = NULL;
1455 write_unlock_bh(&sock->sk->sk_callback_lock);
1456 }
1457
nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue * queue)1458 static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1459 {
1460 struct nvmet_tcp_cmd *cmd = queue->cmds;
1461 int i;
1462
1463 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1464 if (nvmet_tcp_need_data_in(cmd))
1465 nvmet_req_uninit(&cmd->req);
1466 }
1467
1468 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1469 /* failed in connect */
1470 nvmet_req_uninit(&queue->connect.req);
1471 }
1472 }
1473
nvmet_tcp_free_cmd_data_in_buffers(struct nvmet_tcp_queue * queue)1474 static void nvmet_tcp_free_cmd_data_in_buffers(struct nvmet_tcp_queue *queue)
1475 {
1476 struct nvmet_tcp_cmd *cmd = queue->cmds;
1477 int i;
1478
1479 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1480 if (nvmet_tcp_need_data_in(cmd))
1481 nvmet_tcp_free_cmd_buffers(cmd);
1482 }
1483
1484 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect))
1485 nvmet_tcp_free_cmd_buffers(&queue->connect);
1486 }
1487
nvmet_tcp_release_queue_work(struct work_struct * w)1488 static void nvmet_tcp_release_queue_work(struct work_struct *w)
1489 {
1490 struct page *page;
1491 struct nvmet_tcp_queue *queue =
1492 container_of(w, struct nvmet_tcp_queue, release_work);
1493
1494 mutex_lock(&nvmet_tcp_queue_mutex);
1495 list_del_init(&queue->queue_list);
1496 mutex_unlock(&nvmet_tcp_queue_mutex);
1497
1498 nvmet_tcp_restore_socket_callbacks(queue);
1499 cancel_work_sync(&queue->io_work);
1500 /* stop accepting incoming data */
1501 queue->rcv_state = NVMET_TCP_RECV_ERR;
1502
1503 nvmet_tcp_uninit_data_in_cmds(queue);
1504 nvmet_sq_destroy(&queue->nvme_sq);
1505 cancel_work_sync(&queue->io_work);
1506 nvmet_tcp_free_cmd_data_in_buffers(queue);
1507 sock_release(queue->sock);
1508 nvmet_tcp_free_cmds(queue);
1509 if (queue->hdr_digest || queue->data_digest)
1510 nvmet_tcp_free_crypto(queue);
1511 ida_free(&nvmet_tcp_queue_ida, queue->idx);
1512
1513 page = virt_to_head_page(queue->pf_cache.va);
1514 __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
1515 kfree(queue);
1516 }
1517
nvmet_tcp_data_ready(struct sock * sk)1518 static void nvmet_tcp_data_ready(struct sock *sk)
1519 {
1520 struct nvmet_tcp_queue *queue;
1521
1522 trace_sk_data_ready(sk);
1523
1524 read_lock_bh(&sk->sk_callback_lock);
1525 queue = sk->sk_user_data;
1526 if (likely(queue))
1527 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1528 read_unlock_bh(&sk->sk_callback_lock);
1529 }
1530
nvmet_tcp_write_space(struct sock * sk)1531 static void nvmet_tcp_write_space(struct sock *sk)
1532 {
1533 struct nvmet_tcp_queue *queue;
1534
1535 read_lock_bh(&sk->sk_callback_lock);
1536 queue = sk->sk_user_data;
1537 if (unlikely(!queue))
1538 goto out;
1539
1540 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1541 queue->write_space(sk);
1542 goto out;
1543 }
1544
1545 if (sk_stream_is_writeable(sk)) {
1546 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1547 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1548 }
1549 out:
1550 read_unlock_bh(&sk->sk_callback_lock);
1551 }
1552
nvmet_tcp_state_change(struct sock * sk)1553 static void nvmet_tcp_state_change(struct sock *sk)
1554 {
1555 struct nvmet_tcp_queue *queue;
1556
1557 read_lock_bh(&sk->sk_callback_lock);
1558 queue = sk->sk_user_data;
1559 if (!queue)
1560 goto done;
1561
1562 switch (sk->sk_state) {
1563 case TCP_FIN_WAIT2:
1564 case TCP_LAST_ACK:
1565 break;
1566 case TCP_FIN_WAIT1:
1567 case TCP_CLOSE_WAIT:
1568 case TCP_CLOSE:
1569 /* FALLTHRU */
1570 nvmet_tcp_schedule_release_queue(queue);
1571 break;
1572 default:
1573 pr_warn("queue %d unhandled state %d\n",
1574 queue->idx, sk->sk_state);
1575 }
1576 done:
1577 read_unlock_bh(&sk->sk_callback_lock);
1578 }
1579
nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue * queue)1580 static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1581 {
1582 struct socket *sock = queue->sock;
1583 struct inet_sock *inet = inet_sk(sock->sk);
1584 int ret;
1585
1586 ret = kernel_getsockname(sock,
1587 (struct sockaddr *)&queue->sockaddr);
1588 if (ret < 0)
1589 return ret;
1590
1591 ret = kernel_getpeername(sock,
1592 (struct sockaddr *)&queue->sockaddr_peer);
1593 if (ret < 0)
1594 return ret;
1595
1596 /*
1597 * Cleanup whatever is sitting in the TCP transmit queue on socket
1598 * close. This is done to prevent stale data from being sent should
1599 * the network connection be restored before TCP times out.
1600 */
1601 sock_no_linger(sock->sk);
1602
1603 if (so_priority > 0)
1604 sock_set_priority(sock->sk, so_priority);
1605
1606 /* Set socket type of service */
1607 if (inet->rcv_tos > 0)
1608 ip_sock_set_tos(sock->sk, inet->rcv_tos);
1609
1610 ret = 0;
1611 write_lock_bh(&sock->sk->sk_callback_lock);
1612 if (sock->sk->sk_state != TCP_ESTABLISHED) {
1613 /*
1614 * If the socket is already closing, don't even start
1615 * consuming it
1616 */
1617 ret = -ENOTCONN;
1618 } else {
1619 sock->sk->sk_user_data = queue;
1620 queue->data_ready = sock->sk->sk_data_ready;
1621 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1622 queue->state_change = sock->sk->sk_state_change;
1623 sock->sk->sk_state_change = nvmet_tcp_state_change;
1624 queue->write_space = sock->sk->sk_write_space;
1625 sock->sk->sk_write_space = nvmet_tcp_write_space;
1626 if (idle_poll_period_usecs)
1627 nvmet_tcp_arm_queue_deadline(queue);
1628 queue_work_on(queue_cpu(queue), nvmet_tcp_wq, &queue->io_work);
1629 }
1630 write_unlock_bh(&sock->sk->sk_callback_lock);
1631
1632 return ret;
1633 }
1634
nvmet_tcp_alloc_queue(struct nvmet_tcp_port * port,struct socket * newsock)1635 static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1636 struct socket *newsock)
1637 {
1638 struct nvmet_tcp_queue *queue;
1639 int ret;
1640
1641 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1642 if (!queue)
1643 return -ENOMEM;
1644
1645 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1646 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1647 queue->sock = newsock;
1648 queue->port = port;
1649 queue->nr_cmds = 0;
1650 spin_lock_init(&queue->state_lock);
1651 queue->state = NVMET_TCP_Q_CONNECTING;
1652 INIT_LIST_HEAD(&queue->free_list);
1653 init_llist_head(&queue->resp_list);
1654 INIT_LIST_HEAD(&queue->resp_send_list);
1655
1656 queue->idx = ida_alloc(&nvmet_tcp_queue_ida, GFP_KERNEL);
1657 if (queue->idx < 0) {
1658 ret = queue->idx;
1659 goto out_free_queue;
1660 }
1661
1662 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1663 if (ret)
1664 goto out_ida_remove;
1665
1666 ret = nvmet_sq_init(&queue->nvme_sq);
1667 if (ret)
1668 goto out_free_connect;
1669
1670 nvmet_prepare_receive_pdu(queue);
1671
1672 mutex_lock(&nvmet_tcp_queue_mutex);
1673 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1674 mutex_unlock(&nvmet_tcp_queue_mutex);
1675
1676 ret = nvmet_tcp_set_queue_sock(queue);
1677 if (ret)
1678 goto out_destroy_sq;
1679
1680 return 0;
1681 out_destroy_sq:
1682 mutex_lock(&nvmet_tcp_queue_mutex);
1683 list_del_init(&queue->queue_list);
1684 mutex_unlock(&nvmet_tcp_queue_mutex);
1685 nvmet_sq_destroy(&queue->nvme_sq);
1686 out_free_connect:
1687 nvmet_tcp_free_cmd(&queue->connect);
1688 out_ida_remove:
1689 ida_free(&nvmet_tcp_queue_ida, queue->idx);
1690 out_free_queue:
1691 kfree(queue);
1692 return ret;
1693 }
1694
nvmet_tcp_accept_work(struct work_struct * w)1695 static void nvmet_tcp_accept_work(struct work_struct *w)
1696 {
1697 struct nvmet_tcp_port *port =
1698 container_of(w, struct nvmet_tcp_port, accept_work);
1699 struct socket *newsock;
1700 int ret;
1701
1702 while (true) {
1703 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1704 if (ret < 0) {
1705 if (ret != -EAGAIN)
1706 pr_warn("failed to accept err=%d\n", ret);
1707 return;
1708 }
1709 ret = nvmet_tcp_alloc_queue(port, newsock);
1710 if (ret) {
1711 pr_err("failed to allocate queue\n");
1712 sock_release(newsock);
1713 }
1714 }
1715 }
1716
nvmet_tcp_listen_data_ready(struct sock * sk)1717 static void nvmet_tcp_listen_data_ready(struct sock *sk)
1718 {
1719 struct nvmet_tcp_port *port;
1720
1721 trace_sk_data_ready(sk);
1722
1723 read_lock_bh(&sk->sk_callback_lock);
1724 port = sk->sk_user_data;
1725 if (!port)
1726 goto out;
1727
1728 if (sk->sk_state == TCP_LISTEN)
1729 queue_work(nvmet_wq, &port->accept_work);
1730 out:
1731 read_unlock_bh(&sk->sk_callback_lock);
1732 }
1733
nvmet_tcp_add_port(struct nvmet_port * nport)1734 static int nvmet_tcp_add_port(struct nvmet_port *nport)
1735 {
1736 struct nvmet_tcp_port *port;
1737 __kernel_sa_family_t af;
1738 int ret;
1739
1740 port = kzalloc(sizeof(*port), GFP_KERNEL);
1741 if (!port)
1742 return -ENOMEM;
1743
1744 switch (nport->disc_addr.adrfam) {
1745 case NVMF_ADDR_FAMILY_IP4:
1746 af = AF_INET;
1747 break;
1748 case NVMF_ADDR_FAMILY_IP6:
1749 af = AF_INET6;
1750 break;
1751 default:
1752 pr_err("address family %d not supported\n",
1753 nport->disc_addr.adrfam);
1754 ret = -EINVAL;
1755 goto err_port;
1756 }
1757
1758 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1759 nport->disc_addr.trsvcid, &port->addr);
1760 if (ret) {
1761 pr_err("malformed ip/port passed: %s:%s\n",
1762 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1763 goto err_port;
1764 }
1765
1766 port->nport = nport;
1767 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1768 if (port->nport->inline_data_size < 0)
1769 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1770
1771 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1772 IPPROTO_TCP, &port->sock);
1773 if (ret) {
1774 pr_err("failed to create a socket\n");
1775 goto err_port;
1776 }
1777
1778 port->sock->sk->sk_user_data = port;
1779 port->data_ready = port->sock->sk->sk_data_ready;
1780 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1781 sock_set_reuseaddr(port->sock->sk);
1782 tcp_sock_set_nodelay(port->sock->sk);
1783 if (so_priority > 0)
1784 sock_set_priority(port->sock->sk, so_priority);
1785
1786 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1787 sizeof(port->addr));
1788 if (ret) {
1789 pr_err("failed to bind port socket %d\n", ret);
1790 goto err_sock;
1791 }
1792
1793 ret = kernel_listen(port->sock, 128);
1794 if (ret) {
1795 pr_err("failed to listen %d on port sock\n", ret);
1796 goto err_sock;
1797 }
1798
1799 nport->priv = port;
1800 pr_info("enabling port %d (%pISpc)\n",
1801 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1802
1803 return 0;
1804
1805 err_sock:
1806 sock_release(port->sock);
1807 err_port:
1808 kfree(port);
1809 return ret;
1810 }
1811
nvmet_tcp_destroy_port_queues(struct nvmet_tcp_port * port)1812 static void nvmet_tcp_destroy_port_queues(struct nvmet_tcp_port *port)
1813 {
1814 struct nvmet_tcp_queue *queue;
1815
1816 mutex_lock(&nvmet_tcp_queue_mutex);
1817 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1818 if (queue->port == port)
1819 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1820 mutex_unlock(&nvmet_tcp_queue_mutex);
1821 }
1822
nvmet_tcp_remove_port(struct nvmet_port * nport)1823 static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1824 {
1825 struct nvmet_tcp_port *port = nport->priv;
1826
1827 write_lock_bh(&port->sock->sk->sk_callback_lock);
1828 port->sock->sk->sk_data_ready = port->data_ready;
1829 port->sock->sk->sk_user_data = NULL;
1830 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1831 cancel_work_sync(&port->accept_work);
1832 /*
1833 * Destroy the remaining queues, which are not belong to any
1834 * controller yet.
1835 */
1836 nvmet_tcp_destroy_port_queues(port);
1837
1838 sock_release(port->sock);
1839 kfree(port);
1840 }
1841
nvmet_tcp_delete_ctrl(struct nvmet_ctrl * ctrl)1842 static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1843 {
1844 struct nvmet_tcp_queue *queue;
1845
1846 mutex_lock(&nvmet_tcp_queue_mutex);
1847 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1848 if (queue->nvme_sq.ctrl == ctrl)
1849 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1850 mutex_unlock(&nvmet_tcp_queue_mutex);
1851 }
1852
nvmet_tcp_install_queue(struct nvmet_sq * sq)1853 static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1854 {
1855 struct nvmet_tcp_queue *queue =
1856 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1857
1858 if (sq->qid == 0) {
1859 /* Let inflight controller teardown complete */
1860 flush_workqueue(nvmet_wq);
1861 }
1862
1863 queue->nr_cmds = sq->size * 2;
1864 if (nvmet_tcp_alloc_cmds(queue))
1865 return NVME_SC_INTERNAL;
1866 return 0;
1867 }
1868
nvmet_tcp_disc_port_addr(struct nvmet_req * req,struct nvmet_port * nport,char * traddr)1869 static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1870 struct nvmet_port *nport, char *traddr)
1871 {
1872 struct nvmet_tcp_port *port = nport->priv;
1873
1874 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1875 struct nvmet_tcp_cmd *cmd =
1876 container_of(req, struct nvmet_tcp_cmd, req);
1877 struct nvmet_tcp_queue *queue = cmd->queue;
1878
1879 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1880 } else {
1881 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1882 }
1883 }
1884
1885 static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
1886 .owner = THIS_MODULE,
1887 .type = NVMF_TRTYPE_TCP,
1888 .msdbd = 1,
1889 .add_port = nvmet_tcp_add_port,
1890 .remove_port = nvmet_tcp_remove_port,
1891 .queue_response = nvmet_tcp_queue_response,
1892 .delete_ctrl = nvmet_tcp_delete_ctrl,
1893 .install_queue = nvmet_tcp_install_queue,
1894 .disc_traddr = nvmet_tcp_disc_port_addr,
1895 };
1896
nvmet_tcp_init(void)1897 static int __init nvmet_tcp_init(void)
1898 {
1899 int ret;
1900
1901 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq",
1902 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
1903 if (!nvmet_tcp_wq)
1904 return -ENOMEM;
1905
1906 ret = nvmet_register_transport(&nvmet_tcp_ops);
1907 if (ret)
1908 goto err;
1909
1910 return 0;
1911 err:
1912 destroy_workqueue(nvmet_tcp_wq);
1913 return ret;
1914 }
1915
nvmet_tcp_exit(void)1916 static void __exit nvmet_tcp_exit(void)
1917 {
1918 struct nvmet_tcp_queue *queue;
1919
1920 nvmet_unregister_transport(&nvmet_tcp_ops);
1921
1922 flush_workqueue(nvmet_wq);
1923 mutex_lock(&nvmet_tcp_queue_mutex);
1924 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1925 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1926 mutex_unlock(&nvmet_tcp_queue_mutex);
1927 flush_workqueue(nvmet_wq);
1928
1929 destroy_workqueue(nvmet_tcp_wq);
1930 ida_destroy(&nvmet_tcp_queue_ida);
1931 }
1932
1933 module_init(nvmet_tcp_init);
1934 module_exit(nvmet_tcp_exit);
1935
1936 MODULE_LICENSE("GPL v2");
1937 MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
1938