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iwlwifi: mvm: fix pending frame counter calculation
[linux/fpc-iii.git] / drivers / scsi / iscsi_tcp.c
blobace4f1f41b8e0bf196e7330cfd3f51d3eadbfc2a
1 /*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * See the file COPYING included with this distribution for more details.
21 *
22 * Credits:
23 * Christoph Hellwig
24 * FUJITA Tomonori
25 * Arne Redlich
26 * Zhenyu Wang
27 */
28
29 #include <crypto/hash.h>
30 #include <linux/types.h>
31 #include <linux/inet.h>
32 #include <linux/slab.h>
33 #include <linux/file.h>
34 #include <linux/blkdev.h>
35 #include <linux/delay.h>
36 #include <linux/kfifo.h>
37 #include <linux/scatterlist.h>
38 #include <linux/module.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi_cmnd.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_transport_iscsi.h>
45
46 #include "iscsi_tcp.h"
47
48 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
49 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
50 "Alex Aizman <itn780@yahoo.com>");
51 MODULE_DESCRIPTION("iSCSI/TCP data-path");
52 MODULE_LICENSE("GPL");
53
54 static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
55 static struct scsi_host_template iscsi_sw_tcp_sht;
56 static struct iscsi_transport iscsi_sw_tcp_transport;
57
58 static unsigned int iscsi_max_lun = ~0;
59 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
60
61 static int iscsi_sw_tcp_dbg;
62 module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
63 S_IRUGO | S_IWUSR);
64 MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
65 "Set to 1 to turn on, and zero to turn off. Default is off.");
66
67 #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
68 do { \
69 if (iscsi_sw_tcp_dbg) \
70 iscsi_conn_printk(KERN_INFO, _conn, \
71 "%s " dbg_fmt, \
72 __func__, ##arg); \
73 } while (0);
74
75
76 /**
77 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
78 * @rd_desc: read descriptor
79 * @skb: socket buffer
80 * @offset: offset in skb
81 * @len: skb->len - offset
82 */
83 static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
84 unsigned int offset, size_t len)
85 {
86 struct iscsi_conn *conn = rd_desc->arg.data;
87 unsigned int consumed, total_consumed = 0;
88 int status;
89
90 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
91
92 do {
93 status = 0;
94 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
95 offset += consumed;
96 total_consumed += consumed;
97 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
98
99 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
100 skb->len - offset, status);
101 return total_consumed;
102 }
103
104 /**
105 * iscsi_sw_sk_state_check - check socket state
106 * @sk: socket
107 *
108 * If the socket is in CLOSE or CLOSE_WAIT we should
109 * not close the connection if there is still some
110 * data pending.
111 *
112 * Must be called with sk_callback_lock.
113 */
114 static inline int iscsi_sw_sk_state_check(struct sock *sk)
115 {
116 struct iscsi_conn *conn = sk->sk_user_data;
117
118 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
119 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
120 !atomic_read(&sk->sk_rmem_alloc)) {
121 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
122 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
123 return -ECONNRESET;
124 }
125 return 0;
126 }
127
128 static void iscsi_sw_tcp_data_ready(struct sock *sk)
129 {
130 struct iscsi_conn *conn;
131 struct iscsi_tcp_conn *tcp_conn;
132 read_descriptor_t rd_desc;
133
134 read_lock_bh(&sk->sk_callback_lock);
135 conn = sk->sk_user_data;
136 if (!conn) {
137 read_unlock_bh(&sk->sk_callback_lock);
138 return;
139 }
140 tcp_conn = conn->dd_data;
141
142 /*
143 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
144 * We set count to 1 because we want the network layer to
145 * hand us all the skbs that are available. iscsi_tcp_recv
146 * handled pdus that cross buffers or pdus that still need data.
147 */
148 rd_desc.arg.data = conn;
149 rd_desc.count = 1;
150 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
151
152 iscsi_sw_sk_state_check(sk);
153
154 /* If we had to (atomically) map a highmem page,
155 * unmap it now. */
156 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
157 read_unlock_bh(&sk->sk_callback_lock);
158 }
159
160 static void iscsi_sw_tcp_state_change(struct sock *sk)
161 {
162 struct iscsi_tcp_conn *tcp_conn;
163 struct iscsi_sw_tcp_conn *tcp_sw_conn;
164 struct iscsi_conn *conn;
165 struct iscsi_session *session;
166 void (*old_state_change)(struct sock *);
167
168 read_lock_bh(&sk->sk_callback_lock);
169 conn = sk->sk_user_data;
170 if (!conn) {
171 read_unlock_bh(&sk->sk_callback_lock);
172 return;
173 }
174 session = conn->session;
175
176 iscsi_sw_sk_state_check(sk);
177
178 tcp_conn = conn->dd_data;
179 tcp_sw_conn = tcp_conn->dd_data;
180 old_state_change = tcp_sw_conn->old_state_change;
181
182 read_unlock_bh(&sk->sk_callback_lock);
183
184 old_state_change(sk);
185 }
186
187 /**
188 * iscsi_write_space - Called when more output buffer space is available
189 * @sk: socket space is available for
190 **/
191 static void iscsi_sw_tcp_write_space(struct sock *sk)
192 {
193 struct iscsi_conn *conn;
194 struct iscsi_tcp_conn *tcp_conn;
195 struct iscsi_sw_tcp_conn *tcp_sw_conn;
196 void (*old_write_space)(struct sock *);
197
198 read_lock_bh(&sk->sk_callback_lock);
199 conn = sk->sk_user_data;
200 if (!conn) {
201 read_unlock_bh(&sk->sk_callback_lock);
202 return;
203 }
204
205 tcp_conn = conn->dd_data;
206 tcp_sw_conn = tcp_conn->dd_data;
207 old_write_space = tcp_sw_conn->old_write_space;
208 read_unlock_bh(&sk->sk_callback_lock);
209
210 old_write_space(sk);
211
212 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
213 iscsi_conn_queue_work(conn);
214 }
215
216 static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
217 {
218 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
219 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
220 struct sock *sk = tcp_sw_conn->sock->sk;
221
222 /* assign new callbacks */
223 write_lock_bh(&sk->sk_callback_lock);
224 sk->sk_user_data = conn;
225 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
226 tcp_sw_conn->old_state_change = sk->sk_state_change;
227 tcp_sw_conn->old_write_space = sk->sk_write_space;
228 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
229 sk->sk_state_change = iscsi_sw_tcp_state_change;
230 sk->sk_write_space = iscsi_sw_tcp_write_space;
231 write_unlock_bh(&sk->sk_callback_lock);
232 }
233
234 static void
235 iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
236 {
237 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
238 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
239 struct sock *sk = tcp_sw_conn->sock->sk;
240
241 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
242 write_lock_bh(&sk->sk_callback_lock);
243 sk->sk_user_data = NULL;
244 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
245 sk->sk_state_change = tcp_sw_conn->old_state_change;
246 sk->sk_write_space = tcp_sw_conn->old_write_space;
247 sk->sk_no_check_tx = 0;
248 write_unlock_bh(&sk->sk_callback_lock);
249 }
250
251 /**
252 * iscsi_sw_tcp_xmit_segment - transmit segment
253 * @tcp_conn: the iSCSI TCP connection
254 * @segment: the buffer to transmnit
255 *
256 * This function transmits as much of the buffer as
257 * the network layer will accept, and returns the number of
258 * bytes transmitted.
259 *
260 * If CRC hashing is enabled, the function will compute the
261 * hash as it goes. When the entire segment has been transmitted,
262 * it will retrieve the hash value and send it as well.
263 */
264 static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
265 struct iscsi_segment *segment)
266 {
267 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
268 struct socket *sk = tcp_sw_conn->sock;
269 unsigned int copied = 0;
270 int r = 0;
271
272 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
273 struct scatterlist *sg;
274 unsigned int offset, copy;
275 int flags = 0;
276
277 r = 0;
278 offset = segment->copied;
279 copy = segment->size - offset;
280
281 if (segment->total_copied + segment->size < segment->total_size)
282 flags |= MSG_MORE;
283
284 /* Use sendpage if we can; else fall back to sendmsg */
285 if (!segment->data) {
286 sg = segment->sg;
287 offset += segment->sg_offset + sg->offset;
288 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
289 copy, flags);
290 } else {
291 struct msghdr msg = { .msg_flags = flags };
292 struct kvec iov = {
293 .iov_base = segment->data + offset,
294 .iov_len = copy
295 };
296
297 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
298 }
299
300 if (r < 0) {
301 iscsi_tcp_segment_unmap(segment);
302 return r;
303 }
304 copied += r;
305 }
306 return copied;
307 }
308
309 /**
310 * iscsi_sw_tcp_xmit - TCP transmit
311 **/
312 static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
313 {
314 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
315 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
316 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
317 unsigned int consumed = 0;
318 int rc = 0;
319
320 while (1) {
321 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
322 /*
323 * We may not have been able to send data because the conn
324 * is getting stopped. libiscsi will know so propagate err
325 * for it to do the right thing.
326 */
327 if (rc == -EAGAIN)
328 return rc;
329 else if (rc < 0) {
330 rc = ISCSI_ERR_XMIT_FAILED;
331 goto error;
332 } else if (rc == 0)
333 break;
334
335 consumed += rc;
336
337 if (segment->total_copied >= segment->total_size) {
338 if (segment->done != NULL) {
339 rc = segment->done(tcp_conn, segment);
340 if (rc != 0)
341 goto error;
342 }
343 }
344 }
345
346 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
347
348 conn->txdata_octets += consumed;
349 return consumed;
350
351 error:
352 /* Transmit error. We could initiate error recovery
353 * here. */
354 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
355 iscsi_conn_failure(conn, rc);
356 return -EIO;
357 }
358
359 /**
360 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
361 */
362 static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
363 {
364 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
365 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
366 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
367
368 return segment->total_copied - segment->total_size;
369 }
370
371 static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
372 {
373 struct iscsi_conn *conn = task->conn;
374 unsigned long pflags = current->flags;
375 int rc = 0;
376
377 current->flags |= PF_MEMALLOC;
378
379 while (iscsi_sw_tcp_xmit_qlen(conn)) {
380 rc = iscsi_sw_tcp_xmit(conn);
381 if (rc == 0) {
382 rc = -EAGAIN;
383 break;
384 }
385 if (rc < 0)
386 break;
387 rc = 0;
388 }
389
390 tsk_restore_flags(current, pflags, PF_MEMALLOC);
391 return rc;
392 }
393
394 /*
395 * This is called when we're done sending the header.
396 * Simply copy the data_segment to the send segment, and return.
397 */
398 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
399 struct iscsi_segment *segment)
400 {
401 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
402
403 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
404 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
405 "Header done. Next segment size %u total_size %u\n",
406 tcp_sw_conn->out.segment.size,
407 tcp_sw_conn->out.segment.total_size);
408 return 0;
409 }
410
411 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
412 size_t hdrlen)
413 {
414 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
415 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
416
417 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
418 "digest enabled" : "digest disabled");
419
420 /* Clear the data segment - needs to be filled in by the
421 * caller using iscsi_tcp_send_data_prep() */
422 memset(&tcp_sw_conn->out.data_segment, 0,
423 sizeof(struct iscsi_segment));
424
425 /* If header digest is enabled, compute the CRC and
426 * place the digest into the same buffer. We make
427 * sure that both iscsi_tcp_task and mtask have
428 * sufficient room.
429 */
430 if (conn->hdrdgst_en) {
431 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
432 hdr + hdrlen);
433 hdrlen += ISCSI_DIGEST_SIZE;
434 }
435
436 /* Remember header pointer for later, when we need
437 * to decide whether there's a payload to go along
438 * with the header. */
439 tcp_sw_conn->out.hdr = hdr;
440
441 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
442 iscsi_sw_tcp_send_hdr_done, NULL);
443 }
444
445 /*
446 * Prepare the send buffer for the payload data.
447 * Padding and checksumming will all be taken care
448 * of by the iscsi_segment routines.
449 */
450 static int
451 iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
452 unsigned int count, unsigned int offset,
453 unsigned int len)
454 {
455 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
456 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
457 struct ahash_request *tx_hash = NULL;
458 unsigned int hdr_spec_len;
459
460 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
461 conn->datadgst_en ?
462 "digest enabled" : "digest disabled");
463
464 /* Make sure the datalen matches what the caller
465 said he would send. */
466 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
467 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
468
469 if (conn->datadgst_en)
470 tx_hash = tcp_sw_conn->tx_hash;
471
472 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
473 sg, count, offset, len,
474 NULL, tx_hash);
475 }
476
477 static void
478 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
479 size_t len)
480 {
481 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
482 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
483 struct ahash_request *tx_hash = NULL;
484 unsigned int hdr_spec_len;
485
486 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
487 "digest enabled" : "digest disabled");
488
489 /* Make sure the datalen matches what the caller
490 said he would send. */
491 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
492 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
493
494 if (conn->datadgst_en)
495 tx_hash = tcp_sw_conn->tx_hash;
496
497 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
498 data, len, NULL, tx_hash);
499 }
500
501 static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
502 unsigned int offset, unsigned int count)
503 {
504 struct iscsi_conn *conn = task->conn;
505 int err = 0;
506
507 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
508
509 if (!count)
510 return 0;
511
512 if (!task->sc)
513 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
514 else {
515 struct scsi_data_buffer *sdb = scsi_out(task->sc);
516
517 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
518 sdb->table.nents, offset,
519 count);
520 }
521
522 if (err) {
523 /* got invalid offset/len */
524 return -EIO;
525 }
526 return 0;
527 }
528
529 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
530 {
531 struct iscsi_tcp_task *tcp_task = task->dd_data;
532
533 task->hdr = task->dd_data + sizeof(*tcp_task);
534 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
535 return 0;
536 }
537
538 static struct iscsi_cls_conn *
539 iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
540 uint32_t conn_idx)
541 {
542 struct iscsi_conn *conn;
543 struct iscsi_cls_conn *cls_conn;
544 struct iscsi_tcp_conn *tcp_conn;
545 struct iscsi_sw_tcp_conn *tcp_sw_conn;
546 struct crypto_ahash *tfm;
547
548 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
549 conn_idx);
550 if (!cls_conn)
551 return NULL;
552 conn = cls_conn->dd_data;
553 tcp_conn = conn->dd_data;
554 tcp_sw_conn = tcp_conn->dd_data;
555
556 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
557 if (IS_ERR(tfm))
558 goto free_conn;
559
560 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
561 if (!tcp_sw_conn->tx_hash)
562 goto free_tfm;
563 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
564
565 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
566 if (!tcp_sw_conn->rx_hash)
567 goto free_tx_hash;
568 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
569
570 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
571
572 return cls_conn;
573
574 free_tx_hash:
575 ahash_request_free(tcp_sw_conn->tx_hash);
576 free_tfm:
577 crypto_free_ahash(tfm);
578 free_conn:
579 iscsi_conn_printk(KERN_ERR, conn,
580 "Could not create connection due to crc32c "
581 "loading error. Make sure the crc32c "
582 "module is built as a module or into the "
583 "kernel\n");
584 iscsi_tcp_conn_teardown(cls_conn);
585 return NULL;
586 }
587
588 static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
589 {
590 struct iscsi_session *session = conn->session;
591 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
592 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
593 struct socket *sock = tcp_sw_conn->sock;
594
595 if (!sock)
596 return;
597
598 sock_hold(sock->sk);
599 iscsi_sw_tcp_conn_restore_callbacks(conn);
600 sock_put(sock->sk);
601
602 spin_lock_bh(&session->frwd_lock);
603 tcp_sw_conn->sock = NULL;
604 spin_unlock_bh(&session->frwd_lock);
605 sockfd_put(sock);
606 }
607
608 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
609 {
610 struct iscsi_conn *conn = cls_conn->dd_data;
611 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
612 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
613
614 iscsi_sw_tcp_release_conn(conn);
615
616 ahash_request_free(tcp_sw_conn->rx_hash);
617 if (tcp_sw_conn->tx_hash) {
618 struct crypto_ahash *tfm;
619
620 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
621 ahash_request_free(tcp_sw_conn->tx_hash);
622 crypto_free_ahash(tfm);
623 }
624
625 iscsi_tcp_conn_teardown(cls_conn);
626 }
627
628 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
629 {
630 struct iscsi_conn *conn = cls_conn->dd_data;
631 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
632 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
633 struct socket *sock = tcp_sw_conn->sock;
634
635 /* userspace may have goofed up and not bound us */
636 if (!sock)
637 return;
638
639 sock->sk->sk_err = EIO;
640 wake_up_interruptible(sk_sleep(sock->sk));
641
642 /* stop xmit side */
643 iscsi_suspend_tx(conn);
644
645 /* stop recv side and release socket */
646 iscsi_sw_tcp_release_conn(conn);
647
648 iscsi_conn_stop(cls_conn, flag);
649 }
650
651 static int
652 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
653 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
654 int is_leading)
655 {
656 struct iscsi_session *session = cls_session->dd_data;
657 struct iscsi_conn *conn = cls_conn->dd_data;
658 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
659 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
660 struct sock *sk;
661 struct socket *sock;
662 int err;
663
664 /* lookup for existing socket */
665 sock = sockfd_lookup((int)transport_eph, &err);
666 if (!sock) {
667 iscsi_conn_printk(KERN_ERR, conn,
668 "sockfd_lookup failed %d\n", err);
669 return -EEXIST;
670 }
671
672 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
673 if (err)
674 goto free_socket;
675
676 spin_lock_bh(&session->frwd_lock);
677 /* bind iSCSI connection and socket */
678 tcp_sw_conn->sock = sock;
679 spin_unlock_bh(&session->frwd_lock);
680
681 /* setup Socket parameters */
682 sk = sock->sk;
683 sk->sk_reuse = SK_CAN_REUSE;
684 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
685 sk->sk_allocation = GFP_ATOMIC;
686 sk_set_memalloc(sk);
687
688 iscsi_sw_tcp_conn_set_callbacks(conn);
689 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
690 /*
691 * set receive state machine into initial state
692 */
693 iscsi_tcp_hdr_recv_prep(tcp_conn);
694 return 0;
695
696 free_socket:
697 sockfd_put(sock);
698 return err;
699 }
700
701 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
702 enum iscsi_param param, char *buf,
703 int buflen)
704 {
705 struct iscsi_conn *conn = cls_conn->dd_data;
706 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
707 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
708
709 switch(param) {
710 case ISCSI_PARAM_HDRDGST_EN:
711 iscsi_set_param(cls_conn, param, buf, buflen);
712 break;
713 case ISCSI_PARAM_DATADGST_EN:
714 iscsi_set_param(cls_conn, param, buf, buflen);
715 tcp_sw_conn->sendpage = conn->datadgst_en ?
716 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
717 break;
718 case ISCSI_PARAM_MAX_R2T:
719 return iscsi_tcp_set_max_r2t(conn, buf);
720 default:
721 return iscsi_set_param(cls_conn, param, buf, buflen);
722 }
723
724 return 0;
725 }
726
727 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
728 enum iscsi_param param, char *buf)
729 {
730 struct iscsi_conn *conn = cls_conn->dd_data;
731 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
732 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
733 struct sockaddr_in6 addr;
734 int rc, len;
735
736 switch(param) {
737 case ISCSI_PARAM_CONN_PORT:
738 case ISCSI_PARAM_CONN_ADDRESS:
739 case ISCSI_PARAM_LOCAL_PORT:
740 spin_lock_bh(&conn->session->frwd_lock);
741 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
742 spin_unlock_bh(&conn->session->frwd_lock);
743 return -ENOTCONN;
744 }
745 if (param == ISCSI_PARAM_LOCAL_PORT)
746 rc = kernel_getsockname(tcp_sw_conn->sock,
747 (struct sockaddr *)&addr, &len);
748 else
749 rc = kernel_getpeername(tcp_sw_conn->sock,
750 (struct sockaddr *)&addr, &len);
751 spin_unlock_bh(&conn->session->frwd_lock);
752 if (rc)
753 return rc;
754
755 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
756 &addr, param, buf);
757 default:
758 return iscsi_conn_get_param(cls_conn, param, buf);
759 }
760
761 return 0;
762 }
763
764 static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
765 enum iscsi_host_param param, char *buf)
766 {
767 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
768 struct iscsi_session *session = tcp_sw_host->session;
769 struct iscsi_conn *conn;
770 struct iscsi_tcp_conn *tcp_conn;
771 struct iscsi_sw_tcp_conn *tcp_sw_conn;
772 struct sockaddr_in6 addr;
773 int rc, len;
774
775 switch (param) {
776 case ISCSI_HOST_PARAM_IPADDRESS:
777 if (!session)
778 return -ENOTCONN;
779
780 spin_lock_bh(&session->frwd_lock);
781 conn = session->leadconn;
782 if (!conn) {
783 spin_unlock_bh(&session->frwd_lock);
784 return -ENOTCONN;
785 }
786 tcp_conn = conn->dd_data;
787
788 tcp_sw_conn = tcp_conn->dd_data;
789 if (!tcp_sw_conn->sock) {
790 spin_unlock_bh(&session->frwd_lock);
791 return -ENOTCONN;
792 }
793
794 rc = kernel_getsockname(tcp_sw_conn->sock,
795 (struct sockaddr *)&addr, &len);
796 spin_unlock_bh(&session->frwd_lock);
797 if (rc)
798 return rc;
799
800 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
801 &addr, param, buf);
802 default:
803 return iscsi_host_get_param(shost, param, buf);
804 }
805
806 return 0;
807 }
808
809 static void
810 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
811 struct iscsi_stats *stats)
812 {
813 struct iscsi_conn *conn = cls_conn->dd_data;
814 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
815 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
816
817 stats->custom_length = 3;
818 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
819 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
820 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
821 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
822 strcpy(stats->custom[2].desc, "eh_abort_cnt");
823 stats->custom[2].value = conn->eh_abort_cnt;
824
825 iscsi_tcp_conn_get_stats(cls_conn, stats);
826 }
827
828 static struct iscsi_cls_session *
829 iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
830 uint16_t qdepth, uint32_t initial_cmdsn)
831 {
832 struct iscsi_cls_session *cls_session;
833 struct iscsi_session *session;
834 struct iscsi_sw_tcp_host *tcp_sw_host;
835 struct Scsi_Host *shost;
836
837 if (ep) {
838 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
839 return NULL;
840 }
841
842 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
843 sizeof(struct iscsi_sw_tcp_host), 1);
844 if (!shost)
845 return NULL;
846 shost->transportt = iscsi_sw_tcp_scsi_transport;
847 shost->cmd_per_lun = qdepth;
848 shost->max_lun = iscsi_max_lun;
849 shost->max_id = 0;
850 shost->max_channel = 0;
851 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
852
853 if (iscsi_host_add(shost, NULL))
854 goto free_host;
855
856 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
857 cmds_max, 0,
858 sizeof(struct iscsi_tcp_task) +
859 sizeof(struct iscsi_sw_tcp_hdrbuf),
860 initial_cmdsn, 0);
861 if (!cls_session)
862 goto remove_host;
863 session = cls_session->dd_data;
864 tcp_sw_host = iscsi_host_priv(shost);
865 tcp_sw_host->session = session;
866
867 shost->can_queue = session->scsi_cmds_max;
868 if (iscsi_tcp_r2tpool_alloc(session))
869 goto remove_session;
870 return cls_session;
871
872 remove_session:
873 iscsi_session_teardown(cls_session);
874 remove_host:
875 iscsi_host_remove(shost);
876 free_host:
877 iscsi_host_free(shost);
878 return NULL;
879 }
880
881 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
882 {
883 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
884
885 iscsi_tcp_r2tpool_free(cls_session->dd_data);
886 iscsi_session_teardown(cls_session);
887
888 iscsi_host_remove(shost);
889 iscsi_host_free(shost);
890 }
891
892 static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
893 {
894 switch (param_type) {
895 case ISCSI_HOST_PARAM:
896 switch (param) {
897 case ISCSI_HOST_PARAM_NETDEV_NAME:
898 case ISCSI_HOST_PARAM_HWADDRESS:
899 case ISCSI_HOST_PARAM_IPADDRESS:
900 case ISCSI_HOST_PARAM_INITIATOR_NAME:
901 return S_IRUGO;
902 default:
903 return 0;
904 }
905 case ISCSI_PARAM:
906 switch (param) {
907 case ISCSI_PARAM_MAX_RECV_DLENGTH:
908 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
909 case ISCSI_PARAM_HDRDGST_EN:
910 case ISCSI_PARAM_DATADGST_EN:
911 case ISCSI_PARAM_CONN_ADDRESS:
912 case ISCSI_PARAM_CONN_PORT:
913 case ISCSI_PARAM_LOCAL_PORT:
914 case ISCSI_PARAM_EXP_STATSN:
915 case ISCSI_PARAM_PERSISTENT_ADDRESS:
916 case ISCSI_PARAM_PERSISTENT_PORT:
917 case ISCSI_PARAM_PING_TMO:
918 case ISCSI_PARAM_RECV_TMO:
919 case ISCSI_PARAM_INITIAL_R2T_EN:
920 case ISCSI_PARAM_MAX_R2T:
921 case ISCSI_PARAM_IMM_DATA_EN:
922 case ISCSI_PARAM_FIRST_BURST:
923 case ISCSI_PARAM_MAX_BURST:
924 case ISCSI_PARAM_PDU_INORDER_EN:
925 case ISCSI_PARAM_DATASEQ_INORDER_EN:
926 case ISCSI_PARAM_ERL:
927 case ISCSI_PARAM_TARGET_NAME:
928 case ISCSI_PARAM_TPGT:
929 case ISCSI_PARAM_USERNAME:
930 case ISCSI_PARAM_PASSWORD:
931 case ISCSI_PARAM_USERNAME_IN:
932 case ISCSI_PARAM_PASSWORD_IN:
933 case ISCSI_PARAM_FAST_ABORT:
934 case ISCSI_PARAM_ABORT_TMO:
935 case ISCSI_PARAM_LU_RESET_TMO:
936 case ISCSI_PARAM_TGT_RESET_TMO:
937 case ISCSI_PARAM_IFACE_NAME:
938 case ISCSI_PARAM_INITIATOR_NAME:
939 return S_IRUGO;
940 default:
941 return 0;
942 }
943 }
944
945 return 0;
946 }
947
948 static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
949 {
950 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
951 return 0;
952 }
953
954 static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
955 {
956 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
957 blk_queue_dma_alignment(sdev->request_queue, 0);
958 return 0;
959 }
960
961 static struct scsi_host_template iscsi_sw_tcp_sht = {
962 .module = THIS_MODULE,
963 .name = "iSCSI Initiator over TCP/IP",
964 .queuecommand = iscsi_queuecommand,
965 .change_queue_depth = scsi_change_queue_depth,
966 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
967 .sg_tablesize = 4096,
968 .max_sectors = 0xFFFF,
969 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
970 .eh_abort_handler = iscsi_eh_abort,
971 .eh_device_reset_handler= iscsi_eh_device_reset,
972 .eh_target_reset_handler = iscsi_eh_recover_target,
973 .use_clustering = DISABLE_CLUSTERING,
974 .slave_alloc = iscsi_sw_tcp_slave_alloc,
975 .slave_configure = iscsi_sw_tcp_slave_configure,
976 .target_alloc = iscsi_target_alloc,
977 .proc_name = "iscsi_tcp",
978 .this_id = -1,
979 .track_queue_depth = 1,
980 };
981
982 static struct iscsi_transport iscsi_sw_tcp_transport = {
983 .owner = THIS_MODULE,
984 .name = "tcp",
985 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
986 | CAP_DATADGST,
987 /* session management */
988 .create_session = iscsi_sw_tcp_session_create,
989 .destroy_session = iscsi_sw_tcp_session_destroy,
990 /* connection management */
991 .create_conn = iscsi_sw_tcp_conn_create,
992 .bind_conn = iscsi_sw_tcp_conn_bind,
993 .destroy_conn = iscsi_sw_tcp_conn_destroy,
994 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
995 .set_param = iscsi_sw_tcp_conn_set_param,
996 .get_conn_param = iscsi_sw_tcp_conn_get_param,
997 .get_session_param = iscsi_session_get_param,
998 .start_conn = iscsi_conn_start,
999 .stop_conn = iscsi_sw_tcp_conn_stop,
1000 /* iscsi host params */
1001 .get_host_param = iscsi_sw_tcp_host_get_param,
1002 .set_host_param = iscsi_host_set_param,
1003 /* IO */
1004 .send_pdu = iscsi_conn_send_pdu,
1005 .get_stats = iscsi_sw_tcp_conn_get_stats,
1006 /* iscsi task/cmd helpers */
1007 .init_task = iscsi_tcp_task_init,
1008 .xmit_task = iscsi_tcp_task_xmit,
1009 .cleanup_task = iscsi_tcp_cleanup_task,
1010 /* low level pdu helpers */
1011 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1012 .init_pdu = iscsi_sw_tcp_pdu_init,
1013 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
1014 /* recovery */
1015 .session_recovery_timedout = iscsi_session_recovery_timedout,
1016 };
1017
1018 static int __init iscsi_sw_tcp_init(void)
1019 {
1020 if (iscsi_max_lun < 1) {
1021 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1022 iscsi_max_lun);
1023 return -EINVAL;
1024 }
1025
1026 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1027 &iscsi_sw_tcp_transport);
1028 if (!iscsi_sw_tcp_scsi_transport)
1029 return -ENODEV;
1030
1031 return 0;
1032 }
1033
1034 static void __exit iscsi_sw_tcp_exit(void)
1035 {
1036 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
1037 }
1038
1039 module_init(iscsi_sw_tcp_init);
1040 module_exit(iscsi_sw_tcp_exit);
Linux with added FPC-III support