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net: net_assign_generic() fix
[linux-2.6/mini2440.git] / drivers / scsi / iscsi_tcp.c
blobb7c092d63bbe257013fd64988b197a99bb3279ef
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 <linux/types.h>
30 #include <linux/inet.h>
31 #include <linux/file.h>
32 #include <linux/blkdev.h>
33 #include <linux/crypto.h>
34 #include <linux/delay.h>
35 #include <linux/kfifo.h>
36 #include <linux/scatterlist.h>
37 #include <net/tcp.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_transport_iscsi.h>
43
44 #include "iscsi_tcp.h"
45
46 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
47 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
48 "Alex Aizman <itn780@yahoo.com>");
49 MODULE_DESCRIPTION("iSCSI/TCP data-path");
50 MODULE_LICENSE("GPL");
51
52 static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
53 static struct scsi_host_template iscsi_sw_tcp_sht;
54 static struct iscsi_transport iscsi_sw_tcp_transport;
55
56 static unsigned int iscsi_max_lun = 512;
57 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
58
59 static int iscsi_sw_tcp_dbg;
60 module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
61 S_IRUGO | S_IWUSR);
62 MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
64
65 #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
66 do { \
67 if (iscsi_sw_tcp_dbg) \
68 iscsi_conn_printk(KERN_INFO, _conn, \
69 "%s " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73
74 /**
75 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
76 * @rd_desc: read descriptor
77 * @skb: socket buffer
78 * @offset: offset in skb
79 * @len: skb->len - offset
80 */
81 static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
82 unsigned int offset, size_t len)
83 {
84 struct iscsi_conn *conn = rd_desc->arg.data;
85 unsigned int consumed, total_consumed = 0;
86 int status;
87
88 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
89
90 do {
91 status = 0;
92 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
93 offset += consumed;
94 total_consumed += consumed;
95 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
96
97 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
98 skb->len - offset, status);
99 return total_consumed;
100 }
101
102 static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
103 {
104 struct iscsi_conn *conn = sk->sk_user_data;
105 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
106 read_descriptor_t rd_desc;
107
108 read_lock(&sk->sk_callback_lock);
109
110 /*
111 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
112 * We set count to 1 because we want the network layer to
113 * hand us all the skbs that are available. iscsi_tcp_recv
114 * handled pdus that cross buffers or pdus that still need data.
115 */
116 rd_desc.arg.data = conn;
117 rd_desc.count = 1;
118 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
119
120 read_unlock(&sk->sk_callback_lock);
121
122 /* If we had to (atomically) map a highmem page,
123 * unmap it now. */
124 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
125 }
126
127 static void iscsi_sw_tcp_state_change(struct sock *sk)
128 {
129 struct iscsi_tcp_conn *tcp_conn;
130 struct iscsi_sw_tcp_conn *tcp_sw_conn;
131 struct iscsi_conn *conn;
132 struct iscsi_session *session;
133 void (*old_state_change)(struct sock *);
134
135 read_lock(&sk->sk_callback_lock);
136
137 conn = (struct iscsi_conn*)sk->sk_user_data;
138 session = conn->session;
139
140 if ((sk->sk_state == TCP_CLOSE_WAIT ||
141 sk->sk_state == TCP_CLOSE) &&
142 !atomic_read(&sk->sk_rmem_alloc)) {
143 ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_state_change: "
144 "TCP_CLOSE|TCP_CLOSE_WAIT\n");
145 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
146 }
147
148 tcp_conn = conn->dd_data;
149 tcp_sw_conn = tcp_conn->dd_data;
150 old_state_change = tcp_sw_conn->old_state_change;
151
152 read_unlock(&sk->sk_callback_lock);
153
154 old_state_change(sk);
155 }
156
157 /**
158 * iscsi_write_space - Called when more output buffer space is available
159 * @sk: socket space is available for
160 **/
161 static void iscsi_sw_tcp_write_space(struct sock *sk)
162 {
163 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
164 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
165 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
166
167 tcp_sw_conn->old_write_space(sk);
168 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
169 iscsi_conn_queue_work(conn);
170 }
171
172 static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
173 {
174 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
175 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
176 struct sock *sk = tcp_sw_conn->sock->sk;
177
178 /* assign new callbacks */
179 write_lock_bh(&sk->sk_callback_lock);
180 sk->sk_user_data = conn;
181 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
182 tcp_sw_conn->old_state_change = sk->sk_state_change;
183 tcp_sw_conn->old_write_space = sk->sk_write_space;
184 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
185 sk->sk_state_change = iscsi_sw_tcp_state_change;
186 sk->sk_write_space = iscsi_sw_tcp_write_space;
187 write_unlock_bh(&sk->sk_callback_lock);
188 }
189
190 static void
191 iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn)
192 {
193 struct sock *sk = tcp_sw_conn->sock->sk;
194
195 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
196 write_lock_bh(&sk->sk_callback_lock);
197 sk->sk_user_data = NULL;
198 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
199 sk->sk_state_change = tcp_sw_conn->old_state_change;
200 sk->sk_write_space = tcp_sw_conn->old_write_space;
201 sk->sk_no_check = 0;
202 write_unlock_bh(&sk->sk_callback_lock);
203 }
204
205 /**
206 * iscsi_sw_tcp_xmit_segment - transmit segment
207 * @tcp_conn: the iSCSI TCP connection
208 * @segment: the buffer to transmnit
209 *
210 * This function transmits as much of the buffer as
211 * the network layer will accept, and returns the number of
212 * bytes transmitted.
213 *
214 * If CRC hashing is enabled, the function will compute the
215 * hash as it goes. When the entire segment has been transmitted,
216 * it will retrieve the hash value and send it as well.
217 */
218 static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
219 struct iscsi_segment *segment)
220 {
221 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
222 struct socket *sk = tcp_sw_conn->sock;
223 unsigned int copied = 0;
224 int r = 0;
225
226 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
227 struct scatterlist *sg;
228 unsigned int offset, copy;
229 int flags = 0;
230
231 r = 0;
232 offset = segment->copied;
233 copy = segment->size - offset;
234
235 if (segment->total_copied + segment->size < segment->total_size)
236 flags |= MSG_MORE;
237
238 /* Use sendpage if we can; else fall back to sendmsg */
239 if (!segment->data) {
240 sg = segment->sg;
241 offset += segment->sg_offset + sg->offset;
242 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
243 copy, flags);
244 } else {
245 struct msghdr msg = { .msg_flags = flags };
246 struct kvec iov = {
247 .iov_base = segment->data + offset,
248 .iov_len = copy
249 };
250
251 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
252 }
253
254 if (r < 0) {
255 iscsi_tcp_segment_unmap(segment);
256 if (copied || r == -EAGAIN)
257 break;
258 return r;
259 }
260 copied += r;
261 }
262 return copied;
263 }
264
265 /**
266 * iscsi_sw_tcp_xmit - TCP transmit
267 **/
268 static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
269 {
270 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
271 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
272 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
273 unsigned int consumed = 0;
274 int rc = 0;
275
276 while (1) {
277 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
278 if (rc < 0) {
279 rc = ISCSI_ERR_XMIT_FAILED;
280 goto error;
281 }
282 if (rc == 0)
283 break;
284
285 consumed += rc;
286
287 if (segment->total_copied >= segment->total_size) {
288 if (segment->done != NULL) {
289 rc = segment->done(tcp_conn, segment);
290 if (rc != 0)
291 goto error;
292 }
293 }
294 }
295
296 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
297
298 conn->txdata_octets += consumed;
299 return consumed;
300
301 error:
302 /* Transmit error. We could initiate error recovery
303 * here. */
304 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
305 iscsi_conn_failure(conn, rc);
306 return -EIO;
307 }
308
309 /**
310 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
311 */
312 static inline int iscsi_sw_tcp_xmit_qlen(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
318 return segment->total_copied - segment->total_size;
319 }
320
321 static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
322 {
323 struct iscsi_conn *conn = task->conn;
324 int rc;
325
326 while (iscsi_sw_tcp_xmit_qlen(conn)) {
327 rc = iscsi_sw_tcp_xmit(conn);
328 if (rc == 0)
329 return -EAGAIN;
330 if (rc < 0)
331 return rc;
332 }
333
334 return 0;
335 }
336
337 /*
338 * This is called when we're done sending the header.
339 * Simply copy the data_segment to the send segment, and return.
340 */
341 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
342 struct iscsi_segment *segment)
343 {
344 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
345
346 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
347 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
348 "Header done. Next segment size %u total_size %u\n",
349 tcp_sw_conn->out.segment.size,
350 tcp_sw_conn->out.segment.total_size);
351 return 0;
352 }
353
354 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
355 size_t hdrlen)
356 {
357 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
358 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
359
360 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
361 "digest enabled" : "digest disabled");
362
363 /* Clear the data segment - needs to be filled in by the
364 * caller using iscsi_tcp_send_data_prep() */
365 memset(&tcp_sw_conn->out.data_segment, 0,
366 sizeof(struct iscsi_segment));
367
368 /* If header digest is enabled, compute the CRC and
369 * place the digest into the same buffer. We make
370 * sure that both iscsi_tcp_task and mtask have
371 * sufficient room.
372 */
373 if (conn->hdrdgst_en) {
374 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
375 hdr + hdrlen);
376 hdrlen += ISCSI_DIGEST_SIZE;
377 }
378
379 /* Remember header pointer for later, when we need
380 * to decide whether there's a payload to go along
381 * with the header. */
382 tcp_sw_conn->out.hdr = hdr;
383
384 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
385 iscsi_sw_tcp_send_hdr_done, NULL);
386 }
387
388 /*
389 * Prepare the send buffer for the payload data.
390 * Padding and checksumming will all be taken care
391 * of by the iscsi_segment routines.
392 */
393 static int
394 iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
395 unsigned int count, unsigned int offset,
396 unsigned int len)
397 {
398 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
399 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
400 struct hash_desc *tx_hash = NULL;
401 unsigned int hdr_spec_len;
402
403 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
404 conn->datadgst_en ?
405 "digest enabled" : "digest disabled");
406
407 /* Make sure the datalen matches what the caller
408 said he would send. */
409 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
410 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
411
412 if (conn->datadgst_en)
413 tx_hash = &tcp_sw_conn->tx_hash;
414
415 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
416 sg, count, offset, len,
417 NULL, tx_hash);
418 }
419
420 static void
421 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
422 size_t len)
423 {
424 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
425 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
426 struct hash_desc *tx_hash = NULL;
427 unsigned int hdr_spec_len;
428
429 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
430 "digest enabled" : "digest disabled");
431
432 /* Make sure the datalen matches what the caller
433 said he would send. */
434 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
435 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
436
437 if (conn->datadgst_en)
438 tx_hash = &tcp_sw_conn->tx_hash;
439
440 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
441 data, len, NULL, tx_hash);
442 }
443
444 static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
445 unsigned int offset, unsigned int count)
446 {
447 struct iscsi_conn *conn = task->conn;
448 int err = 0;
449
450 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
451
452 if (!count)
453 return 0;
454
455 if (!task->sc)
456 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
457 else {
458 struct scsi_data_buffer *sdb = scsi_out(task->sc);
459
460 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
461 sdb->table.nents, offset,
462 count);
463 }
464
465 if (err) {
466 /* got invalid offset/len */
467 return -EIO;
468 }
469 return 0;
470 }
471
472 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
473 {
474 struct iscsi_tcp_task *tcp_task = task->dd_data;
475
476 task->hdr = task->dd_data + sizeof(*tcp_task);
477 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
478 return 0;
479 }
480
481 static struct iscsi_cls_conn *
482 iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
483 uint32_t conn_idx)
484 {
485 struct iscsi_conn *conn;
486 struct iscsi_cls_conn *cls_conn;
487 struct iscsi_tcp_conn *tcp_conn;
488 struct iscsi_sw_tcp_conn *tcp_sw_conn;
489
490 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
491 conn_idx);
492 if (!cls_conn)
493 return NULL;
494 conn = cls_conn->dd_data;
495 tcp_conn = conn->dd_data;
496 tcp_sw_conn = tcp_conn->dd_data;
497
498 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
499 CRYPTO_ALG_ASYNC);
500 tcp_sw_conn->tx_hash.flags = 0;
501 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
502 goto free_conn;
503
504 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
505 CRYPTO_ALG_ASYNC);
506 tcp_sw_conn->rx_hash.flags = 0;
507 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
508 goto free_tx_tfm;
509 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
510
511 return cls_conn;
512
513 free_tx_tfm:
514 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
515 free_conn:
516 iscsi_conn_printk(KERN_ERR, conn,
517 "Could not create connection due to crc32c "
518 "loading error. Make sure the crc32c "
519 "module is built as a module or into the "
520 "kernel\n");
521 iscsi_tcp_conn_teardown(cls_conn);
522 return NULL;
523 }
524
525 static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
526 {
527 struct iscsi_session *session = conn->session;
528 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
529 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
530 struct socket *sock = tcp_sw_conn->sock;
531
532 if (!sock)
533 return;
534
535 sock_hold(sock->sk);
536 iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn);
537 sock_put(sock->sk);
538
539 spin_lock_bh(&session->lock);
540 tcp_sw_conn->sock = NULL;
541 spin_unlock_bh(&session->lock);
542 sockfd_put(sock);
543 }
544
545 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
546 {
547 struct iscsi_conn *conn = cls_conn->dd_data;
548 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
549 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
550
551 iscsi_sw_tcp_release_conn(conn);
552
553 if (tcp_sw_conn->tx_hash.tfm)
554 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
555 if (tcp_sw_conn->rx_hash.tfm)
556 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
557
558 iscsi_tcp_conn_teardown(cls_conn);
559 }
560
561 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
562 {
563 struct iscsi_conn *conn = cls_conn->dd_data;
564 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
565 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
566
567 /* userspace may have goofed up and not bound us */
568 if (!tcp_sw_conn->sock)
569 return;
570 /*
571 * Make sure our recv side is stopped.
572 * Older tools called conn stop before ep_disconnect
573 * so IO could still be coming in.
574 */
575 write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
576 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
577 write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
578
579 iscsi_conn_stop(cls_conn, flag);
580 iscsi_sw_tcp_release_conn(conn);
581 }
582
583 static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
584 char *buf, int *port,
585 int (*getname)(struct socket *,
586 struct sockaddr *,
587 int *addrlen))
588 {
589 struct sockaddr_storage *addr;
590 struct sockaddr_in6 *sin6;
591 struct sockaddr_in *sin;
592 int rc = 0, len;
593
594 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
595 if (!addr)
596 return -ENOMEM;
597
598 if (getname(sock, (struct sockaddr *) addr, &len)) {
599 rc = -ENODEV;
600 goto free_addr;
601 }
602
603 switch (addr->ss_family) {
604 case AF_INET:
605 sin = (struct sockaddr_in *)addr;
606 spin_lock_bh(&conn->session->lock);
607 sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
608 *port = be16_to_cpu(sin->sin_port);
609 spin_unlock_bh(&conn->session->lock);
610 break;
611 case AF_INET6:
612 sin6 = (struct sockaddr_in6 *)addr;
613 spin_lock_bh(&conn->session->lock);
614 sprintf(buf, "%pI6", &sin6->sin6_addr);
615 *port = be16_to_cpu(sin6->sin6_port);
616 spin_unlock_bh(&conn->session->lock);
617 break;
618 }
619 free_addr:
620 kfree(addr);
621 return rc;
622 }
623
624 static int
625 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
626 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
627 int is_leading)
628 {
629 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
630 struct iscsi_host *ihost = shost_priv(shost);
631 struct iscsi_conn *conn = cls_conn->dd_data;
632 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
633 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
634 struct sock *sk;
635 struct socket *sock;
636 int err;
637
638 /* lookup for existing socket */
639 sock = sockfd_lookup((int)transport_eph, &err);
640 if (!sock) {
641 iscsi_conn_printk(KERN_ERR, conn,
642 "sockfd_lookup failed %d\n", err);
643 return -EEXIST;
644 }
645 /*
646 * copy these values now because if we drop the session
647 * userspace may still want to query the values since we will
648 * be using them for the reconnect
649 */
650 err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
651 &conn->portal_port, kernel_getpeername);
652 if (err)
653 goto free_socket;
654
655 err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
656 &ihost->local_port, kernel_getsockname);
657 if (err)
658 goto free_socket;
659
660 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
661 if (err)
662 goto free_socket;
663
664 /* bind iSCSI connection and socket */
665 tcp_sw_conn->sock = sock;
666
667 /* setup Socket parameters */
668 sk = sock->sk;
669 sk->sk_reuse = 1;
670 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
671 sk->sk_allocation = GFP_ATOMIC;
672
673 iscsi_sw_tcp_conn_set_callbacks(conn);
674 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
675 /*
676 * set receive state machine into initial state
677 */
678 iscsi_tcp_hdr_recv_prep(tcp_conn);
679 return 0;
680
681 free_socket:
682 sockfd_put(sock);
683 return err;
684 }
685
686 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
687 enum iscsi_param param, char *buf,
688 int buflen)
689 {
690 struct iscsi_conn *conn = cls_conn->dd_data;
691 struct iscsi_session *session = conn->session;
692 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
693 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
694 int value;
695
696 switch(param) {
697 case ISCSI_PARAM_HDRDGST_EN:
698 iscsi_set_param(cls_conn, param, buf, buflen);
699 break;
700 case ISCSI_PARAM_DATADGST_EN:
701 iscsi_set_param(cls_conn, param, buf, buflen);
702 tcp_sw_conn->sendpage = conn->datadgst_en ?
703 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
704 break;
705 case ISCSI_PARAM_MAX_R2T:
706 sscanf(buf, "%d", &value);
707 if (value <= 0 || !is_power_of_2(value))
708 return -EINVAL;
709 if (session->max_r2t == value)
710 break;
711 iscsi_tcp_r2tpool_free(session);
712 iscsi_set_param(cls_conn, param, buf, buflen);
713 if (iscsi_tcp_r2tpool_alloc(session))
714 return -ENOMEM;
715 break;
716 default:
717 return iscsi_set_param(cls_conn, param, buf, buflen);
718 }
719
720 return 0;
721 }
722
723 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
724 enum iscsi_param param, char *buf)
725 {
726 struct iscsi_conn *conn = cls_conn->dd_data;
727 int len;
728
729 switch(param) {
730 case ISCSI_PARAM_CONN_PORT:
731 spin_lock_bh(&conn->session->lock);
732 len = sprintf(buf, "%hu\n", conn->portal_port);
733 spin_unlock_bh(&conn->session->lock);
734 break;
735 case ISCSI_PARAM_CONN_ADDRESS:
736 spin_lock_bh(&conn->session->lock);
737 len = sprintf(buf, "%s\n", conn->portal_address);
738 spin_unlock_bh(&conn->session->lock);
739 break;
740 default:
741 return iscsi_conn_get_param(cls_conn, param, buf);
742 }
743
744 return len;
745 }
746
747 static void
748 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
749 struct iscsi_stats *stats)
750 {
751 struct iscsi_conn *conn = cls_conn->dd_data;
752 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
753 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
754
755 stats->custom_length = 3;
756 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
757 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
758 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
759 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
760 strcpy(stats->custom[2].desc, "eh_abort_cnt");
761 stats->custom[2].value = conn->eh_abort_cnt;
762
763 iscsi_tcp_conn_get_stats(cls_conn, stats);
764 }
765
766 static struct iscsi_cls_session *
767 iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
768 uint16_t qdepth, uint32_t initial_cmdsn)
769 {
770 struct iscsi_cls_session *cls_session;
771 struct iscsi_session *session;
772 struct Scsi_Host *shost;
773
774 if (ep) {
775 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
776 return NULL;
777 }
778
779 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1);
780 if (!shost)
781 return NULL;
782 shost->transportt = iscsi_sw_tcp_scsi_transport;
783 shost->cmd_per_lun = qdepth;
784 shost->max_lun = iscsi_max_lun;
785 shost->max_id = 0;
786 shost->max_channel = 0;
787 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
788
789 if (iscsi_host_add(shost, NULL))
790 goto free_host;
791
792 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
793 cmds_max,
794 sizeof(struct iscsi_tcp_task) +
795 sizeof(struct iscsi_sw_tcp_hdrbuf),
796 initial_cmdsn, 0);
797 if (!cls_session)
798 goto remove_host;
799 session = cls_session->dd_data;
800
801 shost->can_queue = session->scsi_cmds_max;
802 if (iscsi_tcp_r2tpool_alloc(session))
803 goto remove_session;
804 return cls_session;
805
806 remove_session:
807 iscsi_session_teardown(cls_session);
808 remove_host:
809 iscsi_host_remove(shost);
810 free_host:
811 iscsi_host_free(shost);
812 return NULL;
813 }
814
815 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
816 {
817 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
818
819 iscsi_tcp_r2tpool_free(cls_session->dd_data);
820 iscsi_session_teardown(cls_session);
821
822 iscsi_host_remove(shost);
823 iscsi_host_free(shost);
824 }
825
826 static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
827 {
828 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
829 return 0;
830 }
831
832 static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
833 {
834 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
835 blk_queue_dma_alignment(sdev->request_queue, 0);
836 return 0;
837 }
838
839 static struct scsi_host_template iscsi_sw_tcp_sht = {
840 .module = THIS_MODULE,
841 .name = "iSCSI Initiator over TCP/IP",
842 .queuecommand = iscsi_queuecommand,
843 .change_queue_depth = iscsi_change_queue_depth,
844 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
845 .sg_tablesize = 4096,
846 .max_sectors = 0xFFFF,
847 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
848 .eh_abort_handler = iscsi_eh_abort,
849 .eh_device_reset_handler= iscsi_eh_device_reset,
850 .eh_target_reset_handler= iscsi_eh_target_reset,
851 .use_clustering = DISABLE_CLUSTERING,
852 .slave_alloc = iscsi_sw_tcp_slave_alloc,
853 .slave_configure = iscsi_sw_tcp_slave_configure,
854 .target_alloc = iscsi_target_alloc,
855 .proc_name = "iscsi_tcp",
856 .this_id = -1,
857 };
858
859 static struct iscsi_transport iscsi_sw_tcp_transport = {
860 .owner = THIS_MODULE,
861 .name = "tcp",
862 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
863 | CAP_DATADGST,
864 .param_mask = ISCSI_MAX_RECV_DLENGTH |
865 ISCSI_MAX_XMIT_DLENGTH |
866 ISCSI_HDRDGST_EN |
867 ISCSI_DATADGST_EN |
868 ISCSI_INITIAL_R2T_EN |
869 ISCSI_MAX_R2T |
870 ISCSI_IMM_DATA_EN |
871 ISCSI_FIRST_BURST |
872 ISCSI_MAX_BURST |
873 ISCSI_PDU_INORDER_EN |
874 ISCSI_DATASEQ_INORDER_EN |
875 ISCSI_ERL |
876 ISCSI_CONN_PORT |
877 ISCSI_CONN_ADDRESS |
878 ISCSI_EXP_STATSN |
879 ISCSI_PERSISTENT_PORT |
880 ISCSI_PERSISTENT_ADDRESS |
881 ISCSI_TARGET_NAME | ISCSI_TPGT |
882 ISCSI_USERNAME | ISCSI_PASSWORD |
883 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
884 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
885 ISCSI_LU_RESET_TMO |
886 ISCSI_PING_TMO | ISCSI_RECV_TMO |
887 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
888 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
889 ISCSI_HOST_INITIATOR_NAME |
890 ISCSI_HOST_NETDEV_NAME,
891 /* session management */
892 .create_session = iscsi_sw_tcp_session_create,
893 .destroy_session = iscsi_sw_tcp_session_destroy,
894 /* connection management */
895 .create_conn = iscsi_sw_tcp_conn_create,
896 .bind_conn = iscsi_sw_tcp_conn_bind,
897 .destroy_conn = iscsi_sw_tcp_conn_destroy,
898 .set_param = iscsi_sw_tcp_conn_set_param,
899 .get_conn_param = iscsi_sw_tcp_conn_get_param,
900 .get_session_param = iscsi_session_get_param,
901 .start_conn = iscsi_conn_start,
902 .stop_conn = iscsi_sw_tcp_conn_stop,
903 /* iscsi host params */
904 .get_host_param = iscsi_host_get_param,
905 .set_host_param = iscsi_host_set_param,
906 /* IO */
907 .send_pdu = iscsi_conn_send_pdu,
908 .get_stats = iscsi_sw_tcp_conn_get_stats,
909 /* iscsi task/cmd helpers */
910 .init_task = iscsi_tcp_task_init,
911 .xmit_task = iscsi_tcp_task_xmit,
912 .cleanup_task = iscsi_tcp_cleanup_task,
913 /* low level pdu helpers */
914 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
915 .init_pdu = iscsi_sw_tcp_pdu_init,
916 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
917 /* recovery */
918 .session_recovery_timedout = iscsi_session_recovery_timedout,
919 };
920
921 static int __init iscsi_sw_tcp_init(void)
922 {
923 if (iscsi_max_lun < 1) {
924 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
925 iscsi_max_lun);
926 return -EINVAL;
927 }
928
929 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
930 &iscsi_sw_tcp_transport);
931 if (!iscsi_sw_tcp_scsi_transport)
932 return -ENODEV;
933
934 return 0;
935 }
936
937 static void __exit iscsi_sw_tcp_exit(void)
938 {
939 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
940 }
941
942 module_init(iscsi_sw_tcp_init);
943 module_exit(iscsi_sw_tcp_exit);
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