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of: property: Make sure child dependencies don't block probing of parent
[linux/fpc-iii.git] / drivers / scsi / iscsi_tcp.c
blob7bedbe87770492457d6a0853af188cc7d88b3fbc
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * iSCSI Initiator over TCP/IP Data-Path
4 *
5 * Copyright (C) 2004 Dmitry Yusupov
6 * Copyright (C) 2004 Alex Aizman
7 * Copyright (C) 2005 - 2006 Mike Christie
8 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
9 * maintained by open-iscsi@googlegroups.com
10 *
11 * See the file COPYING included with this distribution for more details.
12 *
13 * Credits:
14 * Christoph Hellwig
15 * FUJITA Tomonori
16 * Arne Redlich
17 * Zhenyu Wang
18 */
19
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
42 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
43 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
44 "Alex Aizman <itn780@yahoo.com>");
45 MODULE_DESCRIPTION("iSCSI/TCP data-path");
46 MODULE_LICENSE("GPL");
47
48 static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
49 static struct scsi_host_template iscsi_sw_tcp_sht;
50 static struct iscsi_transport iscsi_sw_tcp_transport;
51
52 static unsigned int iscsi_max_lun = ~0;
53 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
54
55 static int iscsi_sw_tcp_dbg;
56 module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
57 S_IRUGO | S_IWUSR);
58 MODULE_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 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
75 * @rd_desc: read descriptor
76 * @skb: socket buffer
77 * @offset: offset in skb
78 * @len: skb->len - offset
79 */
80 static 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 * iscsi_sw_sk_state_check - check socket state
103 * @sk: socket
104 *
105 * If the socket is in CLOSE or CLOSE_WAIT we should
106 * not close the connection if there is still some
107 * data pending.
108 *
109 * Must be called with sk_callback_lock.
110 */
111 static 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
125 static 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 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
141 * We set count to 1 because we want the network layer to
142 * hand us all the skbs that are available. iscsi_tcp_recv
143 * handled pdus that cross buffers or pdus that still need data.
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 /* If we had to (atomically) map a highmem page,
152 * unmap it now. */
153 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
154 read_unlock_bh(&sk->sk_callback_lock);
155 }
156
157 static 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 * iscsi_write_space - Called when more output buffer space is available
184 * @sk: socket space is available for
185 **/
186 static 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
211 static 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 /* assign new callbacks */
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
229 static void
230 iscsi_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 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
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 * iscsi_sw_tcp_xmit_segment - transmit segment
248 * @tcp_conn: the iSCSI TCP connection
249 * @segment: the buffer to transmnit
250 *
251 * This function transmits as much of the buffer as
252 * the network layer will accept, and returns the number of
253 * bytes transmitted.
254 *
255 * If CRC hashing is enabled, the function will compute the
256 * hash as it goes. When the entire segment has been transmitted,
257 * it will retrieve the hash value and send it as well.
258 */
259 static 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 /* Use sendpage if we can; else fall back to sendmsg */
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 * iscsi_sw_tcp_xmit - TCP transmit
306 * @conn: iscsi connection
307 **/
308 static 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 * We may not have been able to send data because the conn
320 * is getting stopped. libiscsi will know so propagate err
321 * for it to do the right thing.
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
347 error:
348 /* Transmit error. We could initiate error recovery
349 * here. */
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 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
357 * @conn: iscsi connection
358 */
359 static 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
368 static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
369 {
370 struct iscsi_conn *conn = task->conn;
371 unsigned int noreclaim_flag;
372 int rc = 0;
373
374 noreclaim_flag = memalloc_noreclaim_save();
375
376 while (iscsi_sw_tcp_xmit_qlen(conn)) {
377 rc = iscsi_sw_tcp_xmit(conn);
378 if (rc == 0) {
379 rc = -EAGAIN;
380 break;
381 }
382 if (rc < 0)
383 break;
384 rc = 0;
385 }
386
387 memalloc_noreclaim_restore(noreclaim_flag);
388 return rc;
389 }
390
391 /*
392 * This is called when we're done sending the header.
393 * Simply copy the data_segment to the send segment, and return.
394 */
395 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
396 struct iscsi_segment *segment)
397 {
398 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
399
400 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
401 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
402 "Header done. Next segment size %u total_size %u\n",
403 tcp_sw_conn->out.segment.size,
404 tcp_sw_conn->out.segment.total_size);
405 return 0;
406 }
407
408 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
409 size_t hdrlen)
410 {
411 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
412 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
413
414 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
415 "digest enabled" : "digest disabled");
416
417 /* Clear the data segment - needs to be filled in by the
418 * caller using iscsi_tcp_send_data_prep() */
419 memset(&tcp_sw_conn->out.data_segment, 0,
420 sizeof(struct iscsi_segment));
421
422 /* If header digest is enabled, compute the CRC and
423 * place the digest into the same buffer. We make
424 * sure that both iscsi_tcp_task and mtask have
425 * sufficient room.
426 */
427 if (conn->hdrdgst_en) {
428 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
429 hdr + hdrlen);
430 hdrlen += ISCSI_DIGEST_SIZE;
431 }
432
433 /* Remember header pointer for later, when we need
434 * to decide whether there's a payload to go along
435 * with the header. */
436 tcp_sw_conn->out.hdr = hdr;
437
438 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
439 iscsi_sw_tcp_send_hdr_done, NULL);
440 }
441
442 /*
443 * Prepare the send buffer for the payload data.
444 * Padding and checksumming will all be taken care
445 * of by the iscsi_segment routines.
446 */
447 static int
448 iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
449 unsigned int count, unsigned int offset,
450 unsigned int len)
451 {
452 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
453 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
454 struct ahash_request *tx_hash = NULL;
455 unsigned int hdr_spec_len;
456
457 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
458 conn->datadgst_en ?
459 "digest enabled" : "digest disabled");
460
461 /* Make sure the datalen matches what the caller
462 said he would send. */
463 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
464 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
465
466 if (conn->datadgst_en)
467 tx_hash = tcp_sw_conn->tx_hash;
468
469 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
470 sg, count, offset, len,
471 NULL, tx_hash);
472 }
473
474 static void
475 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
476 size_t len)
477 {
478 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
479 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
480 struct ahash_request *tx_hash = NULL;
481 unsigned int hdr_spec_len;
482
483 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
484 "digest enabled" : "digest disabled");
485
486 /* Make sure the datalen matches what the caller
487 said he would send. */
488 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
489 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
490
491 if (conn->datadgst_en)
492 tx_hash = tcp_sw_conn->tx_hash;
493
494 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
495 data, len, NULL, tx_hash);
496 }
497
498 static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
499 unsigned int offset, unsigned int count)
500 {
501 struct iscsi_conn *conn = task->conn;
502 int err = 0;
503
504 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
505
506 if (!count)
507 return 0;
508
509 if (!task->sc)
510 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
511 else {
512 struct scsi_data_buffer *sdb = &task->sc->sdb;
513
514 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
515 sdb->table.nents, offset,
516 count);
517 }
518
519 if (err) {
520 /* got invalid offset/len */
521 return -EIO;
522 }
523 return 0;
524 }
525
526 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
527 {
528 struct iscsi_tcp_task *tcp_task = task->dd_data;
529
530 task->hdr = task->dd_data + sizeof(*tcp_task);
531 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
532 return 0;
533 }
534
535 static struct iscsi_cls_conn *
536 iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
537 uint32_t conn_idx)
538 {
539 struct iscsi_conn *conn;
540 struct iscsi_cls_conn *cls_conn;
541 struct iscsi_tcp_conn *tcp_conn;
542 struct iscsi_sw_tcp_conn *tcp_sw_conn;
543 struct crypto_ahash *tfm;
544
545 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
546 conn_idx);
547 if (!cls_conn)
548 return NULL;
549 conn = cls_conn->dd_data;
550 tcp_conn = conn->dd_data;
551 tcp_sw_conn = tcp_conn->dd_data;
552
553 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
554 if (IS_ERR(tfm))
555 goto free_conn;
556
557 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
558 if (!tcp_sw_conn->tx_hash)
559 goto free_tfm;
560 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
561
562 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
563 if (!tcp_sw_conn->rx_hash)
564 goto free_tx_hash;
565 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
566
567 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
568
569 return cls_conn;
570
571 free_tx_hash:
572 ahash_request_free(tcp_sw_conn->tx_hash);
573 free_tfm:
574 crypto_free_ahash(tfm);
575 free_conn:
576 iscsi_conn_printk(KERN_ERR, conn,
577 "Could not create connection due to crc32c "
578 "loading error. Make sure the crc32c "
579 "module is built as a module or into the "
580 "kernel\n");
581 iscsi_tcp_conn_teardown(cls_conn);
582 return NULL;
583 }
584
585 static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
586 {
587 struct iscsi_session *session = conn->session;
588 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
589 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
590 struct socket *sock = tcp_sw_conn->sock;
591
592 if (!sock)
593 return;
594
595 sock_hold(sock->sk);
596 iscsi_sw_tcp_conn_restore_callbacks(conn);
597 sock_put(sock->sk);
598
599 spin_lock_bh(&session->frwd_lock);
600 tcp_sw_conn->sock = NULL;
601 spin_unlock_bh(&session->frwd_lock);
602 sockfd_put(sock);
603 }
604
605 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
606 {
607 struct iscsi_conn *conn = cls_conn->dd_data;
608 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
609 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
610
611 iscsi_sw_tcp_release_conn(conn);
612
613 ahash_request_free(tcp_sw_conn->rx_hash);
614 if (tcp_sw_conn->tx_hash) {
615 struct crypto_ahash *tfm;
616
617 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
618 ahash_request_free(tcp_sw_conn->tx_hash);
619 crypto_free_ahash(tfm);
620 }
621
622 iscsi_tcp_conn_teardown(cls_conn);
623 }
624
625 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
626 {
627 struct iscsi_conn *conn = cls_conn->dd_data;
628 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
629 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
630 struct socket *sock = tcp_sw_conn->sock;
631
632 /* userspace may have goofed up and not bound us */
633 if (!sock)
634 return;
635
636 sock->sk->sk_err = EIO;
637 wake_up_interruptible(sk_sleep(sock->sk));
638
639 /* stop xmit side */
640 iscsi_suspend_tx(conn);
641
642 /* stop recv side and release socket */
643 iscsi_sw_tcp_release_conn(conn);
644
645 iscsi_conn_stop(cls_conn, flag);
646 }
647
648 static int
649 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
650 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
651 int is_leading)
652 {
653 struct iscsi_session *session = cls_session->dd_data;
654 struct iscsi_conn *conn = cls_conn->dd_data;
655 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
656 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
657 struct sock *sk;
658 struct socket *sock;
659 int err;
660
661 /* lookup for existing socket */
662 sock = sockfd_lookup((int)transport_eph, &err);
663 if (!sock) {
664 iscsi_conn_printk(KERN_ERR, conn,
665 "sockfd_lookup failed %d\n", err);
666 return -EEXIST;
667 }
668
669 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
670 if (err)
671 goto free_socket;
672
673 spin_lock_bh(&session->frwd_lock);
674 /* bind iSCSI connection and socket */
675 tcp_sw_conn->sock = sock;
676 spin_unlock_bh(&session->frwd_lock);
677
678 /* setup Socket parameters */
679 sk = sock->sk;
680 sk->sk_reuse = SK_CAN_REUSE;
681 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
682 sk->sk_allocation = GFP_ATOMIC;
683 sk_set_memalloc(sk);
684
685 iscsi_sw_tcp_conn_set_callbacks(conn);
686 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
687 /*
688 * set receive state machine into initial state
689 */
690 iscsi_tcp_hdr_recv_prep(tcp_conn);
691 return 0;
692
693 free_socket:
694 sockfd_put(sock);
695 return err;
696 }
697
698 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
699 enum iscsi_param param, char *buf,
700 int buflen)
701 {
702 struct iscsi_conn *conn = cls_conn->dd_data;
703 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
704 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
705
706 switch(param) {
707 case ISCSI_PARAM_HDRDGST_EN:
708 iscsi_set_param(cls_conn, param, buf, buflen);
709 break;
710 case ISCSI_PARAM_DATADGST_EN:
711 iscsi_set_param(cls_conn, param, buf, buflen);
712 tcp_sw_conn->sendpage = conn->datadgst_en ?
713 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
714 break;
715 case ISCSI_PARAM_MAX_R2T:
716 return iscsi_tcp_set_max_r2t(conn, buf);
717 default:
718 return iscsi_set_param(cls_conn, param, buf, buflen);
719 }
720
721 return 0;
722 }
723
724 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
725 enum iscsi_param param, char *buf)
726 {
727 struct iscsi_conn *conn = cls_conn->dd_data;
728 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
729 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
730 struct sockaddr_in6 addr;
731 int rc;
732
733 switch(param) {
734 case ISCSI_PARAM_CONN_PORT:
735 case ISCSI_PARAM_CONN_ADDRESS:
736 case ISCSI_PARAM_LOCAL_PORT:
737 spin_lock_bh(&conn->session->frwd_lock);
738 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
739 spin_unlock_bh(&conn->session->frwd_lock);
740 return -ENOTCONN;
741 }
742 if (param == ISCSI_PARAM_LOCAL_PORT)
743 rc = kernel_getsockname(tcp_sw_conn->sock,
744 (struct sockaddr *)&addr);
745 else
746 rc = kernel_getpeername(tcp_sw_conn->sock,
747 (struct sockaddr *)&addr);
748 spin_unlock_bh(&conn->session->frwd_lock);
749 if (rc < 0)
750 return rc;
751
752 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
753 &addr, param, buf);
754 default:
755 return iscsi_conn_get_param(cls_conn, param, buf);
756 }
757
758 return 0;
759 }
760
761 static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
762 enum iscsi_host_param param, char *buf)
763 {
764 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
765 struct iscsi_session *session = tcp_sw_host->session;
766 struct iscsi_conn *conn;
767 struct iscsi_tcp_conn *tcp_conn;
768 struct iscsi_sw_tcp_conn *tcp_sw_conn;
769 struct sockaddr_in6 addr;
770 int rc;
771
772 switch (param) {
773 case ISCSI_HOST_PARAM_IPADDRESS:
774 if (!session)
775 return -ENOTCONN;
776
777 spin_lock_bh(&session->frwd_lock);
778 conn = session->leadconn;
779 if (!conn) {
780 spin_unlock_bh(&session->frwd_lock);
781 return -ENOTCONN;
782 }
783 tcp_conn = conn->dd_data;
784
785 tcp_sw_conn = tcp_conn->dd_data;
786 if (!tcp_sw_conn->sock) {
787 spin_unlock_bh(&session->frwd_lock);
788 return -ENOTCONN;
789 }
790
791 rc = kernel_getsockname(tcp_sw_conn->sock,
792 (struct sockaddr *)&addr);
793 spin_unlock_bh(&session->frwd_lock);
794 if (rc < 0)
795 return rc;
796
797 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
798 &addr,
799 (enum iscsi_param)param, buf);
800 default:
801 return iscsi_host_get_param(shost, param, buf);
802 }
803
804 return 0;
805 }
806
807 static void
808 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
809 struct iscsi_stats *stats)
810 {
811 struct iscsi_conn *conn = cls_conn->dd_data;
812 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
813 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
814
815 stats->custom_length = 3;
816 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
817 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
818 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
819 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
820 strcpy(stats->custom[2].desc, "eh_abort_cnt");
821 stats->custom[2].value = conn->eh_abort_cnt;
822
823 iscsi_tcp_conn_get_stats(cls_conn, stats);
824 }
825
826 static struct iscsi_cls_session *
827 iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
828 uint16_t qdepth, uint32_t initial_cmdsn)
829 {
830 struct iscsi_cls_session *cls_session;
831 struct iscsi_session *session;
832 struct iscsi_sw_tcp_host *tcp_sw_host;
833 struct Scsi_Host *shost;
834
835 if (ep) {
836 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
837 return NULL;
838 }
839
840 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
841 sizeof(struct iscsi_sw_tcp_host), 1);
842 if (!shost)
843 return NULL;
844 shost->transportt = iscsi_sw_tcp_scsi_transport;
845 shost->cmd_per_lun = qdepth;
846 shost->max_lun = iscsi_max_lun;
847 shost->max_id = 0;
848 shost->max_channel = 0;
849 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
850
851 if (iscsi_host_add(shost, NULL))
852 goto free_host;
853
854 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
855 cmds_max, 0,
856 sizeof(struct iscsi_tcp_task) +
857 sizeof(struct iscsi_sw_tcp_hdrbuf),
858 initial_cmdsn, 0);
859 if (!cls_session)
860 goto remove_host;
861 session = cls_session->dd_data;
862 tcp_sw_host = iscsi_host_priv(shost);
863 tcp_sw_host->session = session;
864
865 shost->can_queue = session->scsi_cmds_max;
866 if (iscsi_tcp_r2tpool_alloc(session))
867 goto remove_session;
868 return cls_session;
869
870 remove_session:
871 iscsi_session_teardown(cls_session);
872 remove_host:
873 iscsi_host_remove(shost);
874 free_host:
875 iscsi_host_free(shost);
876 return NULL;
877 }
878
879 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
880 {
881 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
882
883 iscsi_tcp_r2tpool_free(cls_session->dd_data);
884 iscsi_session_teardown(cls_session);
885
886 iscsi_host_remove(shost);
887 iscsi_host_free(shost);
888 }
889
890 static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
891 {
892 switch (param_type) {
893 case ISCSI_HOST_PARAM:
894 switch (param) {
895 case ISCSI_HOST_PARAM_NETDEV_NAME:
896 case ISCSI_HOST_PARAM_HWADDRESS:
897 case ISCSI_HOST_PARAM_IPADDRESS:
898 case ISCSI_HOST_PARAM_INITIATOR_NAME:
899 return S_IRUGO;
900 default:
901 return 0;
902 }
903 case ISCSI_PARAM:
904 switch (param) {
905 case ISCSI_PARAM_MAX_RECV_DLENGTH:
906 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
907 case ISCSI_PARAM_HDRDGST_EN:
908 case ISCSI_PARAM_DATADGST_EN:
909 case ISCSI_PARAM_CONN_ADDRESS:
910 case ISCSI_PARAM_CONN_PORT:
911 case ISCSI_PARAM_LOCAL_PORT:
912 case ISCSI_PARAM_EXP_STATSN:
913 case ISCSI_PARAM_PERSISTENT_ADDRESS:
914 case ISCSI_PARAM_PERSISTENT_PORT:
915 case ISCSI_PARAM_PING_TMO:
916 case ISCSI_PARAM_RECV_TMO:
917 case ISCSI_PARAM_INITIAL_R2T_EN:
918 case ISCSI_PARAM_MAX_R2T:
919 case ISCSI_PARAM_IMM_DATA_EN:
920 case ISCSI_PARAM_FIRST_BURST:
921 case ISCSI_PARAM_MAX_BURST:
922 case ISCSI_PARAM_PDU_INORDER_EN:
923 case ISCSI_PARAM_DATASEQ_INORDER_EN:
924 case ISCSI_PARAM_ERL:
925 case ISCSI_PARAM_TARGET_NAME:
926 case ISCSI_PARAM_TPGT:
927 case ISCSI_PARAM_USERNAME:
928 case ISCSI_PARAM_PASSWORD:
929 case ISCSI_PARAM_USERNAME_IN:
930 case ISCSI_PARAM_PASSWORD_IN:
931 case ISCSI_PARAM_FAST_ABORT:
932 case ISCSI_PARAM_ABORT_TMO:
933 case ISCSI_PARAM_LU_RESET_TMO:
934 case ISCSI_PARAM_TGT_RESET_TMO:
935 case ISCSI_PARAM_IFACE_NAME:
936 case ISCSI_PARAM_INITIATOR_NAME:
937 return S_IRUGO;
938 default:
939 return 0;
940 }
941 }
942
943 return 0;
944 }
945
946 static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
947 {
948 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
949 struct iscsi_session *session = tcp_sw_host->session;
950 struct iscsi_conn *conn = session->leadconn;
951
952 if (conn->datadgst_en)
953 sdev->request_queue->backing_dev_info->capabilities
954 |= BDI_CAP_STABLE_WRITES;
955 blk_queue_dma_alignment(sdev->request_queue, 0);
956 return 0;
957 }
958
959 static struct scsi_host_template iscsi_sw_tcp_sht = {
960 .module = THIS_MODULE,
961 .name = "iSCSI Initiator over TCP/IP",
962 .queuecommand = iscsi_queuecommand,
963 .change_queue_depth = scsi_change_queue_depth,
964 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
965 .sg_tablesize = 4096,
966 .max_sectors = 0xFFFF,
967 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
968 .eh_timed_out = iscsi_eh_cmd_timed_out,
969 .eh_abort_handler = iscsi_eh_abort,
970 .eh_device_reset_handler= iscsi_eh_device_reset,
971 .eh_target_reset_handler = iscsi_eh_recover_target,
972 .dma_boundary = PAGE_SIZE - 1,
973 .slave_configure = iscsi_sw_tcp_slave_configure,
974 .target_alloc = iscsi_target_alloc,
975 .proc_name = "iscsi_tcp",
976 .this_id = -1,
977 .track_queue_depth = 1,
978 };
979
980 static struct iscsi_transport iscsi_sw_tcp_transport = {
981 .owner = THIS_MODULE,
982 .name = "tcp",
983 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
984 | CAP_DATADGST,
985 /* session management */
986 .create_session = iscsi_sw_tcp_session_create,
987 .destroy_session = iscsi_sw_tcp_session_destroy,
988 /* connection management */
989 .create_conn = iscsi_sw_tcp_conn_create,
990 .bind_conn = iscsi_sw_tcp_conn_bind,
991 .destroy_conn = iscsi_sw_tcp_conn_destroy,
992 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
993 .set_param = iscsi_sw_tcp_conn_set_param,
994 .get_conn_param = iscsi_sw_tcp_conn_get_param,
995 .get_session_param = iscsi_session_get_param,
996 .start_conn = iscsi_conn_start,
997 .stop_conn = iscsi_sw_tcp_conn_stop,
998 /* iscsi host params */
999 .get_host_param = iscsi_sw_tcp_host_get_param,
1000 .set_host_param = iscsi_host_set_param,
1001 /* IO */
1002 .send_pdu = iscsi_conn_send_pdu,
1003 .get_stats = iscsi_sw_tcp_conn_get_stats,
1004 /* iscsi task/cmd helpers */
1005 .init_task = iscsi_tcp_task_init,
1006 .xmit_task = iscsi_tcp_task_xmit,
1007 .cleanup_task = iscsi_tcp_cleanup_task,
1008 /* low level pdu helpers */
1009 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1010 .init_pdu = iscsi_sw_tcp_pdu_init,
1011 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
1012 /* recovery */
1013 .session_recovery_timedout = iscsi_session_recovery_timedout,
1014 };
1015
1016 static int __init iscsi_sw_tcp_init(void)
1017 {
1018 if (iscsi_max_lun < 1) {
1019 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1020 iscsi_max_lun);
1021 return -EINVAL;
1022 }
1023
1024 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1025 &iscsi_sw_tcp_transport);
1026 if (!iscsi_sw_tcp_scsi_transport)
1027 return -ENODEV;
1028
1029 return 0;
1030 }
1031
1032 static void __exit iscsi_sw_tcp_exit(void)
1033 {
1034 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
1035 }
1036
1037 module_init(iscsi_sw_tcp_init);
1038 module_exit(iscsi_sw_tcp_exit);
Linux with added FPC-III support