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20#include <crypto/hash.h>
21#include <linux/types.h>
22#include <linux/inet.h>
23#include <linux/slab.h>
24#include <linux/sched/mm.h>
25#include <linux/file.h>
26#include <linux/blkdev.h>
27#include <linux/delay.h>
28#include <linux/kfifo.h>
29#include <linux/scatterlist.h>
30#include <linux/module.h>
31#include <linux/backing-dev.h>
32#include <net/tcp.h>
33#include <scsi/scsi_cmnd.h>
34#include <scsi/scsi_device.h>
35#include <scsi/scsi_host.h>
36#include <scsi/scsi.h>
37#include <scsi/scsi_transport_iscsi.h>
38#include <trace/events/iscsi.h>
39
40#include "iscsi_tcp.h"
41
42MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
43 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
44 "Alex Aizman <itn780@yahoo.com>");
45MODULE_DESCRIPTION("iSCSI/TCP data-path");
46MODULE_LICENSE("GPL");
47
48static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
49static struct scsi_host_template iscsi_sw_tcp_sht;
50static struct iscsi_transport iscsi_sw_tcp_transport;
51
52static unsigned int iscsi_max_lun = ~0;
53module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
54
55static int iscsi_sw_tcp_dbg;
56module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
57 S_IRUGO | S_IWUSR);
58MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
59 "Set to 1 to turn on, and zero to turn off. Default is off.");
60
61#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
62 do { \
63 if (iscsi_sw_tcp_dbg) \
64 iscsi_conn_printk(KERN_INFO, _conn, \
65 "%s " dbg_fmt, \
66 __func__, ##arg); \
67 iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \
68 &(_conn)->cls_conn->dev, \
69 "%s " dbg_fmt, __func__, ##arg);\
70 } while (0);
71
72
73
74
75
76
77
78
79
80static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
81 unsigned int offset, size_t len)
82{
83 struct iscsi_conn *conn = rd_desc->arg.data;
84 unsigned int consumed, total_consumed = 0;
85 int status;
86
87 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
88
89 do {
90 status = 0;
91 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
92 offset += consumed;
93 total_consumed += consumed;
94 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
95
96 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
97 skb->len - offset, status);
98 return total_consumed;
99}
100
101
102
103
104
105
106
107
108
109
110
111static inline int iscsi_sw_sk_state_check(struct sock *sk)
112{
113 struct iscsi_conn *conn = sk->sk_user_data;
114
115 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
116 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
117 !atomic_read(&sk->sk_rmem_alloc)) {
118 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
119 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
120 return -ECONNRESET;
121 }
122 return 0;
123}
124
125static void iscsi_sw_tcp_data_ready(struct sock *sk)
126{
127 struct iscsi_conn *conn;
128 struct iscsi_tcp_conn *tcp_conn;
129 read_descriptor_t rd_desc;
130
131 read_lock_bh(&sk->sk_callback_lock);
132 conn = sk->sk_user_data;
133 if (!conn) {
134 read_unlock_bh(&sk->sk_callback_lock);
135 return;
136 }
137 tcp_conn = conn->dd_data;
138
139
140
141
142
143
144
145 rd_desc.arg.data = conn;
146 rd_desc.count = 1;
147 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
148
149 iscsi_sw_sk_state_check(sk);
150
151
152
153 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
154 read_unlock_bh(&sk->sk_callback_lock);
155}
156
157static void iscsi_sw_tcp_state_change(struct sock *sk)
158{
159 struct iscsi_tcp_conn *tcp_conn;
160 struct iscsi_sw_tcp_conn *tcp_sw_conn;
161 struct iscsi_conn *conn;
162 void (*old_state_change)(struct sock *);
163
164 read_lock_bh(&sk->sk_callback_lock);
165 conn = sk->sk_user_data;
166 if (!conn) {
167 read_unlock_bh(&sk->sk_callback_lock);
168 return;
169 }
170
171 iscsi_sw_sk_state_check(sk);
172
173 tcp_conn = conn->dd_data;
174 tcp_sw_conn = tcp_conn->dd_data;
175 old_state_change = tcp_sw_conn->old_state_change;
176
177 read_unlock_bh(&sk->sk_callback_lock);
178
179 old_state_change(sk);
180}
181
182
183
184
185
186static void iscsi_sw_tcp_write_space(struct sock *sk)
187{
188 struct iscsi_conn *conn;
189 struct iscsi_tcp_conn *tcp_conn;
190 struct iscsi_sw_tcp_conn *tcp_sw_conn;
191 void (*old_write_space)(struct sock *);
192
193 read_lock_bh(&sk->sk_callback_lock);
194 conn = sk->sk_user_data;
195 if (!conn) {
196 read_unlock_bh(&sk->sk_callback_lock);
197 return;
198 }
199
200 tcp_conn = conn->dd_data;
201 tcp_sw_conn = tcp_conn->dd_data;
202 old_write_space = tcp_sw_conn->old_write_space;
203 read_unlock_bh(&sk->sk_callback_lock);
204
205 old_write_space(sk);
206
207 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
208 iscsi_conn_queue_work(conn);
209}
210
211static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
212{
213 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
214 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
215 struct sock *sk = tcp_sw_conn->sock->sk;
216
217
218 write_lock_bh(&sk->sk_callback_lock);
219 sk->sk_user_data = conn;
220 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
221 tcp_sw_conn->old_state_change = sk->sk_state_change;
222 tcp_sw_conn->old_write_space = sk->sk_write_space;
223 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
224 sk->sk_state_change = iscsi_sw_tcp_state_change;
225 sk->sk_write_space = iscsi_sw_tcp_write_space;
226 write_unlock_bh(&sk->sk_callback_lock);
227}
228
229static void
230iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
231{
232 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
233 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
234 struct sock *sk = tcp_sw_conn->sock->sk;
235
236
237 write_lock_bh(&sk->sk_callback_lock);
238 sk->sk_user_data = NULL;
239 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
240 sk->sk_state_change = tcp_sw_conn->old_state_change;
241 sk->sk_write_space = tcp_sw_conn->old_write_space;
242 sk->sk_no_check_tx = 0;
243 write_unlock_bh(&sk->sk_callback_lock);
244}
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
260 struct iscsi_segment *segment)
261{
262 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
263 struct socket *sk = tcp_sw_conn->sock;
264 unsigned int copied = 0;
265 int r = 0;
266
267 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
268 struct scatterlist *sg;
269 unsigned int offset, copy;
270 int flags = 0;
271
272 r = 0;
273 offset = segment->copied;
274 copy = segment->size - offset;
275
276 if (segment->total_copied + segment->size < segment->total_size)
277 flags |= MSG_MORE;
278
279
280 if (!segment->data) {
281 sg = segment->sg;
282 offset += segment->sg_offset + sg->offset;
283 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
284 copy, flags);
285 } else {
286 struct msghdr msg = { .msg_flags = flags };
287 struct kvec iov = {
288 .iov_base = segment->data + offset,
289 .iov_len = copy
290 };
291
292 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
293 }
294
295 if (r < 0) {
296 iscsi_tcp_segment_unmap(segment);
297 return r;
298 }
299 copied += r;
300 }
301 return copied;
302}
303
304
305
306
307
308static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
309{
310 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
311 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
312 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
313 unsigned int consumed = 0;
314 int rc = 0;
315
316 while (1) {
317 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
318
319
320
321
322
323 if (rc == -EAGAIN)
324 return rc;
325 else if (rc < 0) {
326 rc = ISCSI_ERR_XMIT_FAILED;
327 goto error;
328 } else if (rc == 0)
329 break;
330
331 consumed += rc;
332
333 if (segment->total_copied >= segment->total_size) {
334 if (segment->done != NULL) {
335 rc = segment->done(tcp_conn, segment);
336 if (rc != 0)
337 goto error;
338 }
339 }
340 }
341
342 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
343
344 conn->txdata_octets += consumed;
345 return consumed;
346
347error:
348
349
350 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
351 iscsi_conn_failure(conn, rc);
352 return -EIO;
353}
354
355
356
357
358
359static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
360{
361 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
362 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
363 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
364
365 return segment->total_copied - segment->total_size;
366}
367
368static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
369{
370 struct iscsi_conn *conn = task->conn;
371 unsigned int noreclaim_flag;
372 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
373 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
374 int rc = 0;
375
376 if (!tcp_sw_conn->sock) {
377 iscsi_conn_printk(KERN_ERR, conn,
378 "Transport not bound to socket!\n");
379 return -EINVAL;
380 }
381
382 noreclaim_flag = memalloc_noreclaim_save();
383
384 while (iscsi_sw_tcp_xmit_qlen(conn)) {
385 rc = iscsi_sw_tcp_xmit(conn);
386 if (rc == 0) {
387 rc = -EAGAIN;
388 break;
389 }
390 if (rc < 0)
391 break;
392 rc = 0;
393 }
394
395 memalloc_noreclaim_restore(noreclaim_flag);
396 return rc;
397}
398
399
400
401
402
403static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
404 struct iscsi_segment *segment)
405{
406 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
407
408 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
409 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
410 "Header done. Next segment size %u total_size %u\n",
411 tcp_sw_conn->out.segment.size,
412 tcp_sw_conn->out.segment.total_size);
413 return 0;
414}
415
416static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
417 size_t hdrlen)
418{
419 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
420 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
421
422 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
423 "digest enabled" : "digest disabled");
424
425
426
427 memset(&tcp_sw_conn->out.data_segment, 0,
428 sizeof(struct iscsi_segment));
429
430
431
432
433
434
435 if (conn->hdrdgst_en) {
436 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
437 hdr + hdrlen);
438 hdrlen += ISCSI_DIGEST_SIZE;
439 }
440
441
442
443
444 tcp_sw_conn->out.hdr = hdr;
445
446 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
447 iscsi_sw_tcp_send_hdr_done, NULL);
448}
449
450
451
452
453
454
455static int
456iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
457 unsigned int count, unsigned int offset,
458 unsigned int len)
459{
460 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
461 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
462 struct ahash_request *tx_hash = NULL;
463 unsigned int hdr_spec_len;
464
465 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
466 conn->datadgst_en ?
467 "digest enabled" : "digest disabled");
468
469
470
471 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
472 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
473
474 if (conn->datadgst_en)
475 tx_hash = tcp_sw_conn->tx_hash;
476
477 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
478 sg, count, offset, len,
479 NULL, tx_hash);
480}
481
482static void
483iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
484 size_t len)
485{
486 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
487 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
488 struct ahash_request *tx_hash = NULL;
489 unsigned int hdr_spec_len;
490
491 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
492 "digest enabled" : "digest disabled");
493
494
495
496 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
497 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
498
499 if (conn->datadgst_en)
500 tx_hash = tcp_sw_conn->tx_hash;
501
502 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
503 data, len, NULL, tx_hash);
504}
505
506static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
507 unsigned int offset, unsigned int count)
508{
509 struct iscsi_conn *conn = task->conn;
510 int err = 0;
511
512 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
513
514 if (!count)
515 return 0;
516
517 if (!task->sc)
518 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
519 else {
520 struct scsi_data_buffer *sdb = &task->sc->sdb;
521
522 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
523 sdb->table.nents, offset,
524 count);
525 }
526
527 if (err) {
528
529 return -EIO;
530 }
531 return 0;
532}
533
534static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
535{
536 struct iscsi_tcp_task *tcp_task = task->dd_data;
537
538 task->hdr = task->dd_data + sizeof(*tcp_task);
539 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
540 return 0;
541}
542
543static struct iscsi_cls_conn *
544iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
545 uint32_t conn_idx)
546{
547 struct iscsi_conn *conn;
548 struct iscsi_cls_conn *cls_conn;
549 struct iscsi_tcp_conn *tcp_conn;
550 struct iscsi_sw_tcp_conn *tcp_sw_conn;
551 struct crypto_ahash *tfm;
552
553 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
554 conn_idx);
555 if (!cls_conn)
556 return NULL;
557 conn = cls_conn->dd_data;
558 tcp_conn = conn->dd_data;
559 tcp_sw_conn = tcp_conn->dd_data;
560
561 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
562 if (IS_ERR(tfm))
563 goto free_conn;
564
565 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
566 if (!tcp_sw_conn->tx_hash)
567 goto free_tfm;
568 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
569
570 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
571 if (!tcp_sw_conn->rx_hash)
572 goto free_tx_hash;
573 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
574
575 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
576
577 return cls_conn;
578
579free_tx_hash:
580 ahash_request_free(tcp_sw_conn->tx_hash);
581free_tfm:
582 crypto_free_ahash(tfm);
583free_conn:
584 iscsi_conn_printk(KERN_ERR, conn,
585 "Could not create connection due to crc32c "
586 "loading error. Make sure the crc32c "
587 "module is built as a module or into the "
588 "kernel\n");
589 iscsi_tcp_conn_teardown(cls_conn);
590 return NULL;
591}
592
593static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
594{
595 struct iscsi_session *session = conn->session;
596 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
597 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
598 struct socket *sock = tcp_sw_conn->sock;
599
600 if (!sock)
601 return;
602
603
604
605
606
607 kernel_sock_shutdown(sock, SHUT_RDWR);
608
609 sock_hold(sock->sk);
610 iscsi_sw_tcp_conn_restore_callbacks(conn);
611 sock_put(sock->sk);
612
613 spin_lock_bh(&session->frwd_lock);
614 tcp_sw_conn->sock = NULL;
615 spin_unlock_bh(&session->frwd_lock);
616 sockfd_put(sock);
617}
618
619static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
620{
621 struct iscsi_conn *conn = cls_conn->dd_data;
622 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
623 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
624
625 iscsi_sw_tcp_release_conn(conn);
626
627 ahash_request_free(tcp_sw_conn->rx_hash);
628 if (tcp_sw_conn->tx_hash) {
629 struct crypto_ahash *tfm;
630
631 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
632 ahash_request_free(tcp_sw_conn->tx_hash);
633 crypto_free_ahash(tfm);
634 }
635
636 iscsi_tcp_conn_teardown(cls_conn);
637}
638
639static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
640{
641 struct iscsi_conn *conn = cls_conn->dd_data;
642 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
643 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
644 struct socket *sock = tcp_sw_conn->sock;
645
646
647 if (!sock)
648 return;
649
650 sock->sk->sk_err = EIO;
651 wake_up_interruptible(sk_sleep(sock->sk));
652
653
654 iscsi_suspend_tx(conn);
655
656
657 iscsi_sw_tcp_release_conn(conn);
658
659 iscsi_conn_stop(cls_conn, flag);
660}
661
662static int
663iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
664 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
665 int is_leading)
666{
667 struct iscsi_session *session = cls_session->dd_data;
668 struct iscsi_conn *conn = cls_conn->dd_data;
669 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
670 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
671 struct sock *sk;
672 struct socket *sock;
673 int err;
674
675
676 sock = sockfd_lookup((int)transport_eph, &err);
677 if (!sock) {
678 iscsi_conn_printk(KERN_ERR, conn,
679 "sockfd_lookup failed %d\n", err);
680 return -EEXIST;
681 }
682
683 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
684 if (err)
685 goto free_socket;
686
687 spin_lock_bh(&session->frwd_lock);
688
689 tcp_sw_conn->sock = sock;
690 spin_unlock_bh(&session->frwd_lock);
691
692
693 sk = sock->sk;
694 sk->sk_reuse = SK_CAN_REUSE;
695 sk->sk_sndtimeo = 15 * HZ;
696 sk->sk_allocation = GFP_ATOMIC;
697 sk_set_memalloc(sk);
698 sock_no_linger(sk);
699
700 iscsi_sw_tcp_conn_set_callbacks(conn);
701 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
702
703
704
705 iscsi_tcp_hdr_recv_prep(tcp_conn);
706 return 0;
707
708free_socket:
709 sockfd_put(sock);
710 return err;
711}
712
713static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
714 enum iscsi_param param, char *buf,
715 int buflen)
716{
717 struct iscsi_conn *conn = cls_conn->dd_data;
718 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
719 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
720
721 switch(param) {
722 case ISCSI_PARAM_HDRDGST_EN:
723 iscsi_set_param(cls_conn, param, buf, buflen);
724 break;
725 case ISCSI_PARAM_DATADGST_EN:
726 iscsi_set_param(cls_conn, param, buf, buflen);
727 tcp_sw_conn->sendpage = conn->datadgst_en ?
728 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
729 break;
730 case ISCSI_PARAM_MAX_R2T:
731 return iscsi_tcp_set_max_r2t(conn, buf);
732 default:
733 return iscsi_set_param(cls_conn, param, buf, buflen);
734 }
735
736 return 0;
737}
738
739static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
740 enum iscsi_param param, char *buf)
741{
742 struct iscsi_conn *conn = cls_conn->dd_data;
743 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
744 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
745 struct sockaddr_in6 addr;
746 struct socket *sock;
747 int rc;
748
749 switch(param) {
750 case ISCSI_PARAM_CONN_PORT:
751 case ISCSI_PARAM_CONN_ADDRESS:
752 case ISCSI_PARAM_LOCAL_PORT:
753 spin_lock_bh(&conn->session->frwd_lock);
754 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
755 spin_unlock_bh(&conn->session->frwd_lock);
756 return -ENOTCONN;
757 }
758 sock = tcp_sw_conn->sock;
759 sock_hold(sock->sk);
760 spin_unlock_bh(&conn->session->frwd_lock);
761
762 if (param == ISCSI_PARAM_LOCAL_PORT)
763 rc = kernel_getsockname(sock,
764 (struct sockaddr *)&addr);
765 else
766 rc = kernel_getpeername(sock,
767 (struct sockaddr *)&addr);
768 sock_put(sock->sk);
769 if (rc < 0)
770 return rc;
771
772 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
773 &addr, param, buf);
774 default:
775 return iscsi_conn_get_param(cls_conn, param, buf);
776 }
777
778 return 0;
779}
780
781static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
782 enum iscsi_host_param param, char *buf)
783{
784 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
785 struct iscsi_session *session = tcp_sw_host->session;
786 struct iscsi_conn *conn;
787 struct iscsi_tcp_conn *tcp_conn;
788 struct iscsi_sw_tcp_conn *tcp_sw_conn;
789 struct sockaddr_in6 addr;
790 struct socket *sock;
791 int rc;
792
793 switch (param) {
794 case ISCSI_HOST_PARAM_IPADDRESS:
795 if (!session)
796 return -ENOTCONN;
797
798 spin_lock_bh(&session->frwd_lock);
799 conn = session->leadconn;
800 if (!conn) {
801 spin_unlock_bh(&session->frwd_lock);
802 return -ENOTCONN;
803 }
804 tcp_conn = conn->dd_data;
805 tcp_sw_conn = tcp_conn->dd_data;
806 sock = tcp_sw_conn->sock;
807 if (!sock) {
808 spin_unlock_bh(&session->frwd_lock);
809 return -ENOTCONN;
810 }
811 sock_hold(sock->sk);
812 spin_unlock_bh(&session->frwd_lock);
813
814 rc = kernel_getsockname(sock,
815 (struct sockaddr *)&addr);
816 sock_put(sock->sk);
817 if (rc < 0)
818 return rc;
819
820 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
821 &addr,
822 (enum iscsi_param)param, buf);
823 default:
824 return iscsi_host_get_param(shost, param, buf);
825 }
826
827 return 0;
828}
829
830static void
831iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
832 struct iscsi_stats *stats)
833{
834 struct iscsi_conn *conn = cls_conn->dd_data;
835 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
836 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
837
838 stats->custom_length = 3;
839 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
840 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
841 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
842 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
843 strcpy(stats->custom[2].desc, "eh_abort_cnt");
844 stats->custom[2].value = conn->eh_abort_cnt;
845
846 iscsi_tcp_conn_get_stats(cls_conn, stats);
847}
848
849static struct iscsi_cls_session *
850iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
851 uint16_t qdepth, uint32_t initial_cmdsn)
852{
853 struct iscsi_cls_session *cls_session;
854 struct iscsi_session *session;
855 struct iscsi_sw_tcp_host *tcp_sw_host;
856 struct Scsi_Host *shost;
857 int rc;
858
859 if (ep) {
860 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
861 return NULL;
862 }
863
864 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
865 sizeof(struct iscsi_sw_tcp_host), 1);
866 if (!shost)
867 return NULL;
868 shost->transportt = iscsi_sw_tcp_scsi_transport;
869 shost->cmd_per_lun = qdepth;
870 shost->max_lun = iscsi_max_lun;
871 shost->max_id = 0;
872 shost->max_channel = 0;
873 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
874
875 rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
876 if (rc < 0)
877 goto free_host;
878 shost->can_queue = rc;
879
880 if (iscsi_host_add(shost, NULL))
881 goto free_host;
882
883 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
884 cmds_max, 0,
885 sizeof(struct iscsi_tcp_task) +
886 sizeof(struct iscsi_sw_tcp_hdrbuf),
887 initial_cmdsn, 0);
888 if (!cls_session)
889 goto remove_host;
890 session = cls_session->dd_data;
891 tcp_sw_host = iscsi_host_priv(shost);
892 tcp_sw_host->session = session;
893
894 if (iscsi_tcp_r2tpool_alloc(session))
895 goto remove_session;
896 return cls_session;
897
898remove_session:
899 iscsi_session_teardown(cls_session);
900remove_host:
901 iscsi_host_remove(shost);
902free_host:
903 iscsi_host_free(shost);
904 return NULL;
905}
906
907static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
908{
909 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
910 struct iscsi_session *session = cls_session->dd_data;
911
912 if (WARN_ON_ONCE(session->leadconn))
913 return;
914
915 iscsi_tcp_r2tpool_free(cls_session->dd_data);
916 iscsi_session_teardown(cls_session);
917
918 iscsi_host_remove(shost);
919 iscsi_host_free(shost);
920}
921
922static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
923{
924 switch (param_type) {
925 case ISCSI_HOST_PARAM:
926 switch (param) {
927 case ISCSI_HOST_PARAM_NETDEV_NAME:
928 case ISCSI_HOST_PARAM_HWADDRESS:
929 case ISCSI_HOST_PARAM_IPADDRESS:
930 case ISCSI_HOST_PARAM_INITIATOR_NAME:
931 return S_IRUGO;
932 default:
933 return 0;
934 }
935 case ISCSI_PARAM:
936 switch (param) {
937 case ISCSI_PARAM_MAX_RECV_DLENGTH:
938 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
939 case ISCSI_PARAM_HDRDGST_EN:
940 case ISCSI_PARAM_DATADGST_EN:
941 case ISCSI_PARAM_CONN_ADDRESS:
942 case ISCSI_PARAM_CONN_PORT:
943 case ISCSI_PARAM_LOCAL_PORT:
944 case ISCSI_PARAM_EXP_STATSN:
945 case ISCSI_PARAM_PERSISTENT_ADDRESS:
946 case ISCSI_PARAM_PERSISTENT_PORT:
947 case ISCSI_PARAM_PING_TMO:
948 case ISCSI_PARAM_RECV_TMO:
949 case ISCSI_PARAM_INITIAL_R2T_EN:
950 case ISCSI_PARAM_MAX_R2T:
951 case ISCSI_PARAM_IMM_DATA_EN:
952 case ISCSI_PARAM_FIRST_BURST:
953 case ISCSI_PARAM_MAX_BURST:
954 case ISCSI_PARAM_PDU_INORDER_EN:
955 case ISCSI_PARAM_DATASEQ_INORDER_EN:
956 case ISCSI_PARAM_ERL:
957 case ISCSI_PARAM_TARGET_NAME:
958 case ISCSI_PARAM_TPGT:
959 case ISCSI_PARAM_USERNAME:
960 case ISCSI_PARAM_PASSWORD:
961 case ISCSI_PARAM_USERNAME_IN:
962 case ISCSI_PARAM_PASSWORD_IN:
963 case ISCSI_PARAM_FAST_ABORT:
964 case ISCSI_PARAM_ABORT_TMO:
965 case ISCSI_PARAM_LU_RESET_TMO:
966 case ISCSI_PARAM_TGT_RESET_TMO:
967 case ISCSI_PARAM_IFACE_NAME:
968 case ISCSI_PARAM_INITIATOR_NAME:
969 return S_IRUGO;
970 default:
971 return 0;
972 }
973 }
974
975 return 0;
976}
977
978static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
979{
980 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
981 struct iscsi_session *session = tcp_sw_host->session;
982 struct iscsi_conn *conn = session->leadconn;
983
984 if (conn->datadgst_en)
985 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
986 sdev->request_queue);
987 blk_queue_dma_alignment(sdev->request_queue, 0);
988 return 0;
989}
990
991static struct scsi_host_template iscsi_sw_tcp_sht = {
992 .module = THIS_MODULE,
993 .name = "iSCSI Initiator over TCP/IP",
994 .queuecommand = iscsi_queuecommand,
995 .change_queue_depth = scsi_change_queue_depth,
996 .can_queue = ISCSI_TOTAL_CMDS_MAX,
997 .sg_tablesize = 4096,
998 .max_sectors = 0xFFFF,
999 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
1000 .eh_timed_out = iscsi_eh_cmd_timed_out,
1001 .eh_abort_handler = iscsi_eh_abort,
1002 .eh_device_reset_handler= iscsi_eh_device_reset,
1003 .eh_target_reset_handler = iscsi_eh_recover_target,
1004 .dma_boundary = PAGE_SIZE - 1,
1005 .slave_configure = iscsi_sw_tcp_slave_configure,
1006 .target_alloc = iscsi_target_alloc,
1007 .proc_name = "iscsi_tcp",
1008 .this_id = -1,
1009 .track_queue_depth = 1,
1010};
1011
1012static struct iscsi_transport iscsi_sw_tcp_transport = {
1013 .owner = THIS_MODULE,
1014 .name = "tcp",
1015 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
1016 | CAP_DATADGST,
1017
1018 .create_session = iscsi_sw_tcp_session_create,
1019 .destroy_session = iscsi_sw_tcp_session_destroy,
1020
1021 .create_conn = iscsi_sw_tcp_conn_create,
1022 .bind_conn = iscsi_sw_tcp_conn_bind,
1023 .destroy_conn = iscsi_sw_tcp_conn_destroy,
1024 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
1025 .set_param = iscsi_sw_tcp_conn_set_param,
1026 .get_conn_param = iscsi_sw_tcp_conn_get_param,
1027 .get_session_param = iscsi_session_get_param,
1028 .start_conn = iscsi_conn_start,
1029 .stop_conn = iscsi_sw_tcp_conn_stop,
1030
1031 .get_host_param = iscsi_sw_tcp_host_get_param,
1032 .set_host_param = iscsi_host_set_param,
1033
1034 .send_pdu = iscsi_conn_send_pdu,
1035 .get_stats = iscsi_sw_tcp_conn_get_stats,
1036
1037 .init_task = iscsi_tcp_task_init,
1038 .xmit_task = iscsi_tcp_task_xmit,
1039 .cleanup_task = iscsi_tcp_cleanup_task,
1040
1041 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1042 .init_pdu = iscsi_sw_tcp_pdu_init,
1043 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
1044
1045 .session_recovery_timedout = iscsi_session_recovery_timedout,
1046};
1047
1048static int __init iscsi_sw_tcp_init(void)
1049{
1050 if (iscsi_max_lun < 1) {
1051 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1052 iscsi_max_lun);
1053 return -EINVAL;
1054 }
1055
1056 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1057 &iscsi_sw_tcp_transport);
1058 if (!iscsi_sw_tcp_scsi_transport)
1059 return -ENODEV;
1060
1061 return 0;
1062}
1063
1064static void __exit iscsi_sw_tcp_exit(void)
1065{
1066 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
1067}
1068
1069module_init(iscsi_sw_tcp_init);
1070module_exit(iscsi_sw_tcp_exit);
1071