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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/slab.h>
32#include <linux/file.h>
33#include <linux/blkdev.h>
34#include <linux/crypto.h>
35#include <linux/delay.h>
36#include <linux/kfifo.h>
37#include <linux/scatterlist.h>
38#include <net/tcp.h>
39#include <scsi/scsi_cmnd.h>
40#include <scsi/scsi_device.h>
41#include <scsi/scsi_host.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_transport_iscsi.h>
44
45#include "iscsi_tcp.h"
46
47MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
48 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
49 "Alex Aizman <itn780@yahoo.com>");
50MODULE_DESCRIPTION("iSCSI/TCP data-path");
51MODULE_LICENSE("GPL");
52
53static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
54static struct scsi_host_template iscsi_sw_tcp_sht;
55static struct iscsi_transport iscsi_sw_tcp_transport;
56
57static unsigned int iscsi_max_lun = 512;
58module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
59
60static int iscsi_sw_tcp_dbg;
61module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
62 S_IRUGO | S_IWUSR);
63MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
64 "Set to 1 to turn on, and zero to turn off. Default is off.");
65
66#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
67 do { \
68 if (iscsi_sw_tcp_dbg) \
69 iscsi_conn_printk(KERN_INFO, _conn, \
70 "%s " dbg_fmt, \
71 __func__, ##arg); \
72 } while (0);
73
74
75/**
76 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
77 * @rd_desc: read descriptor
78 * @skb: socket buffer
79 * @offset: offset in skb
80 * @len: skb->len - offset
81 */
82static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
83 unsigned int offset, size_t len)
84{
85 struct iscsi_conn *conn = rd_desc->arg.data;
86 unsigned int consumed, total_consumed = 0;
87 int status;
88
89 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
90
91 do {
92 status = 0;
93 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
94 offset += consumed;
95 total_consumed += consumed;
96 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
97
98 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
99 skb->len - offset, status);
100 return total_consumed;
101}
102
103/**
104 * iscsi_sw_sk_state_check - check socket state
105 * @sk: socket
106 *
107 * If the socket is in CLOSE or CLOSE_WAIT we should
108 * not close the connection if there is still some
109 * data pending.
110 *
111 * Must be called with sk_callback_lock.
112 */
113static inline int iscsi_sw_sk_state_check(struct sock *sk)
114{
115 struct iscsi_conn *conn = sk->sk_user_data;
116
117 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
118 !atomic_read(&sk->sk_rmem_alloc)) {
119 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
120 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
121 return -ECONNRESET;
122 }
123 return 0;
124}
125
126static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
127{
128 struct iscsi_conn *conn;
129 struct iscsi_tcp_conn *tcp_conn;
130 read_descriptor_t rd_desc;
131
132 read_lock(&sk->sk_callback_lock);
133 conn = sk->sk_user_data;
134 if (!conn) {
135 read_unlock(&sk->sk_callback_lock);
136 return;
137 }
138 tcp_conn = conn->dd_data;
139
140 /*
141 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
142 * We set count to 1 because we want the network layer to
143 * hand us all the skbs that are available. iscsi_tcp_recv
144 * handled pdus that cross buffers or pdus that still need data.
145 */
146 rd_desc.arg.data = conn;
147 rd_desc.count = 1;
148 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
149
150 iscsi_sw_sk_state_check(sk);
151
152 /* If we had to (atomically) map a highmem page,
153 * unmap it now. */
154 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
155 read_unlock(&sk->sk_callback_lock);
156}
157
158static void iscsi_sw_tcp_state_change(struct sock *sk)
159{
160 struct iscsi_tcp_conn *tcp_conn;
161 struct iscsi_sw_tcp_conn *tcp_sw_conn;
162 struct iscsi_conn *conn;
163 struct iscsi_session *session;
164 void (*old_state_change)(struct sock *);
165
166 read_lock(&sk->sk_callback_lock);
167 conn = sk->sk_user_data;
168 if (!conn) {
169 read_unlock(&sk->sk_callback_lock);
170 return;
171 }
172 session = conn->session;
173
174 iscsi_sw_sk_state_check(sk);
175
176 tcp_conn = conn->dd_data;
177 tcp_sw_conn = tcp_conn->dd_data;
178 old_state_change = tcp_sw_conn->old_state_change;
179
180 read_unlock(&sk->sk_callback_lock);
181
182 old_state_change(sk);
183}
184
185/**
186 * iscsi_write_space - Called when more output buffer space is available
187 * @sk: socket space is available for
188 **/
189static void iscsi_sw_tcp_write_space(struct sock *sk)
190{
191 struct iscsi_conn *conn;
192 struct iscsi_tcp_conn *tcp_conn;
193 struct iscsi_sw_tcp_conn *tcp_sw_conn;
194 void (*old_write_space)(struct sock *);
195
196 read_lock_bh(&sk->sk_callback_lock);
197 conn = sk->sk_user_data;
198 if (!conn) {
199 read_unlock_bh(&sk->sk_callback_lock);
200 return;
201 }
202
203 tcp_conn = conn->dd_data;
204 tcp_sw_conn = tcp_conn->dd_data;
205 old_write_space = tcp_sw_conn->old_write_space;
206 read_unlock_bh(&sk->sk_callback_lock);
207
208 old_write_space(sk);
209
210 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
211 iscsi_conn_queue_work(conn);
212}
213
214static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
215{
216 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
217 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
218 struct sock *sk = tcp_sw_conn->sock->sk;
219
220 /* assign new callbacks */
221 write_lock_bh(&sk->sk_callback_lock);
222 sk->sk_user_data = conn;
223 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
224 tcp_sw_conn->old_state_change = sk->sk_state_change;
225 tcp_sw_conn->old_write_space = sk->sk_write_space;
226 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
227 sk->sk_state_change = iscsi_sw_tcp_state_change;
228 sk->sk_write_space = iscsi_sw_tcp_write_space;
229 write_unlock_bh(&sk->sk_callback_lock);
230}
231
232static void
233iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
234{
235 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
236 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
237 struct sock *sk = tcp_sw_conn->sock->sk;
238
239 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
240 write_lock_bh(&sk->sk_callback_lock);
241 sk->sk_user_data = NULL;
242 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
243 sk->sk_state_change = tcp_sw_conn->old_state_change;
244 sk->sk_write_space = tcp_sw_conn->old_write_space;
245 sk->sk_no_check = 0;
246 write_unlock_bh(&sk->sk_callback_lock);
247}
248
249/**
250 * iscsi_sw_tcp_xmit_segment - transmit segment
251 * @tcp_conn: the iSCSI TCP connection
252 * @segment: the buffer to transmnit
253 *
254 * This function transmits as much of the buffer as
255 * the network layer will accept, and returns the number of
256 * bytes transmitted.
257 *
258 * If CRC hashing is enabled, the function will compute the
259 * hash as it goes. When the entire segment has been transmitted,
260 * it will retrieve the hash value and send it as well.
261 */
262static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
263 struct iscsi_segment *segment)
264{
265 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
266 struct socket *sk = tcp_sw_conn->sock;
267 unsigned int copied = 0;
268 int r = 0;
269
270 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
271 struct scatterlist *sg;
272 unsigned int offset, copy;
273 int flags = 0;
274
275 r = 0;
276 offset = segment->copied;
277 copy = segment->size - offset;
278
279 if (segment->total_copied + segment->size < segment->total_size)
280 flags |= MSG_MORE;
281
282 /* Use sendpage if we can; else fall back to sendmsg */
283 if (!segment->data) {
284 sg = segment->sg;
285 offset += segment->sg_offset + sg->offset;
286 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
287 copy, flags);
288 } else {
289 struct msghdr msg = { .msg_flags = flags };
290 struct kvec iov = {
291 .iov_base = segment->data + offset,
292 .iov_len = copy
293 };
294
295 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
296 }
297
298 if (r < 0) {
299 iscsi_tcp_segment_unmap(segment);
300 return r;
301 }
302 copied += r;
303 }
304 return copied;
305}
306
307/**
308 * iscsi_sw_tcp_xmit - TCP transmit
309 **/
310static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
311{
312 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
313 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
314 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
315 unsigned int consumed = 0;
316 int rc = 0;
317
318 while (1) {
319 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
320 /*
321 * We may not have been able to send data because the conn
322 * is getting stopped. libiscsi will know so propagate err
323 * for it to do the right thing.
324 */
325 if (rc == -EAGAIN)
326 return rc;
327 else if (rc < 0) {
328 rc = ISCSI_ERR_XMIT_FAILED;
329 goto error;
330 } else if (rc == 0)
331 break;
332
333 consumed += rc;
334
335 if (segment->total_copied >= segment->total_size) {
336 if (segment->done != NULL) {
337 rc = segment->done(tcp_conn, segment);
338 if (rc != 0)
339 goto error;
340 }
341 }
342 }
343
344 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
345
346 conn->txdata_octets += consumed;
347 return consumed;
348
349error:
350 /* Transmit error. We could initiate error recovery
351 * here. */
352 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
353 iscsi_conn_failure(conn, rc);
354 return -EIO;
355}
356
357/**
358 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
359 */
360static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
361{
362 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
363 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
364 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
365
366 return segment->total_copied - segment->total_size;
367}
368
369static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
370{
371 struct iscsi_conn *conn = task->conn;
372 int rc;
373
374 while (iscsi_sw_tcp_xmit_qlen(conn)) {
375 rc = iscsi_sw_tcp_xmit(conn);
376 if (rc == 0)
377 return -EAGAIN;
378 if (rc < 0)
379 return rc;
380 }
381
382 return 0;
383}
384
385/*
386 * This is called when we're done sending the header.
387 * Simply copy the data_segment to the send segment, and return.
388 */
389static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
390 struct iscsi_segment *segment)
391{
392 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
393
394 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
395 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
396 "Header done. Next segment size %u total_size %u\n",
397 tcp_sw_conn->out.segment.size,
398 tcp_sw_conn->out.segment.total_size);
399 return 0;
400}
401
402static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
403 size_t hdrlen)
404{
405 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
406 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
407
408 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
409 "digest enabled" : "digest disabled");
410
411 /* Clear the data segment - needs to be filled in by the
412 * caller using iscsi_tcp_send_data_prep() */
413 memset(&tcp_sw_conn->out.data_segment, 0,
414 sizeof(struct iscsi_segment));
415
416 /* If header digest is enabled, compute the CRC and
417 * place the digest into the same buffer. We make
418 * sure that both iscsi_tcp_task and mtask have
419 * sufficient room.
420 */
421 if (conn->hdrdgst_en) {
422 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
423 hdr + hdrlen);
424 hdrlen += ISCSI_DIGEST_SIZE;
425 }
426
427 /* Remember header pointer for later, when we need
428 * to decide whether there's a payload to go along
429 * with the header. */
430 tcp_sw_conn->out.hdr = hdr;
431
432 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
433 iscsi_sw_tcp_send_hdr_done, NULL);
434}
435
436/*
437 * Prepare the send buffer for the payload data.
438 * Padding and checksumming will all be taken care
439 * of by the iscsi_segment routines.
440 */
441static int
442iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
443 unsigned int count, unsigned int offset,
444 unsigned int len)
445{
446 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
447 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
448 struct hash_desc *tx_hash = NULL;
449 unsigned int hdr_spec_len;
450
451 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
452 conn->datadgst_en ?
453 "digest enabled" : "digest disabled");
454
455 /* Make sure the datalen matches what the caller
456 said he would send. */
457 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
458 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
459
460 if (conn->datadgst_en)
461 tx_hash = &tcp_sw_conn->tx_hash;
462
463 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
464 sg, count, offset, len,
465 NULL, tx_hash);
466}
467
468static void
469iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
470 size_t len)
471{
472 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
473 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
474 struct hash_desc *tx_hash = NULL;
475 unsigned int hdr_spec_len;
476
477 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
478 "digest enabled" : "digest disabled");
479
480 /* Make sure the datalen matches what the caller
481 said he would send. */
482 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
483 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
484
485 if (conn->datadgst_en)
486 tx_hash = &tcp_sw_conn->tx_hash;
487
488 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
489 data, len, NULL, tx_hash);
490}
491
492static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
493 unsigned int offset, unsigned int count)
494{
495 struct iscsi_conn *conn = task->conn;
496 int err = 0;
497
498 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
499
500 if (!count)
501 return 0;
502
503 if (!task->sc)
504 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
505 else {
506 struct scsi_data_buffer *sdb = scsi_out(task->sc);
507
508 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
509 sdb->table.nents, offset,
510 count);
511 }
512
513 if (err) {
514 /* got invalid offset/len */
515 return -EIO;
516 }
517 return 0;
518}
519
520static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
521{
522 struct iscsi_tcp_task *tcp_task = task->dd_data;
523
524 task->hdr = task->dd_data + sizeof(*tcp_task);
525 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
526 return 0;
527}
528
529static struct iscsi_cls_conn *
530iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
531 uint32_t conn_idx)
532{
533 struct iscsi_conn *conn;
534 struct iscsi_cls_conn *cls_conn;
535 struct iscsi_tcp_conn *tcp_conn;
536 struct iscsi_sw_tcp_conn *tcp_sw_conn;
537
538 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
539 conn_idx);
540 if (!cls_conn)
541 return NULL;
542 conn = cls_conn->dd_data;
543 tcp_conn = conn->dd_data;
544 tcp_sw_conn = tcp_conn->dd_data;
545
546 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
547 CRYPTO_ALG_ASYNC);
548 tcp_sw_conn->tx_hash.flags = 0;
549 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
550 goto free_conn;
551
552 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
553 CRYPTO_ALG_ASYNC);
554 tcp_sw_conn->rx_hash.flags = 0;
555 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
556 goto free_tx_tfm;
557 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
558
559 return cls_conn;
560
561free_tx_tfm:
562 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
563free_conn:
564 iscsi_conn_printk(KERN_ERR, conn,
565 "Could not create connection due to crc32c "
566 "loading error. Make sure the crc32c "
567 "module is built as a module or into the "
568 "kernel\n");
569 iscsi_tcp_conn_teardown(cls_conn);
570 return NULL;
571}
572
573static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
574{
575 struct iscsi_session *session = conn->session;
576 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
577 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
578 struct socket *sock = tcp_sw_conn->sock;
579
580 if (!sock)
581 return;
582
583 sock_hold(sock->sk);
584 iscsi_sw_tcp_conn_restore_callbacks(conn);
585 sock_put(sock->sk);
586
587 spin_lock_bh(&session->lock);
588 tcp_sw_conn->sock = NULL;
589 spin_unlock_bh(&session->lock);
590 sockfd_put(sock);
591}
592
593static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
594{
595 struct iscsi_conn *conn = cls_conn->dd_data;
596 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
597 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
598
599 iscsi_sw_tcp_release_conn(conn);
600
601 if (tcp_sw_conn->tx_hash.tfm)
602 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
603 if (tcp_sw_conn->rx_hash.tfm)
604 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
605
606 iscsi_tcp_conn_teardown(cls_conn);
607}
608
609static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
610{
611 struct iscsi_conn *conn = cls_conn->dd_data;
612 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
613 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
614 struct socket *sock = tcp_sw_conn->sock;
615
616 /* userspace may have goofed up and not bound us */
617 if (!sock)
618 return;
619
620 sock->sk->sk_err = EIO;
621 wake_up_interruptible(sk_sleep(sock->sk));
622
623 /* stop xmit side */
624 iscsi_suspend_tx(conn);
625
626 /* stop recv side and release socket */
627 iscsi_sw_tcp_release_conn(conn);
628
629 iscsi_conn_stop(cls_conn, flag);
630}
631
632static int
633iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
634 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
635 int is_leading)
636{
637 struct iscsi_session *session = cls_session->dd_data;
638 struct iscsi_conn *conn = cls_conn->dd_data;
639 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
640 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
641 struct sock *sk;
642 struct socket *sock;
643 int err;
644
645 /* lookup for existing socket */
646 sock = sockfd_lookup((int)transport_eph, &err);
647 if (!sock) {
648 iscsi_conn_printk(KERN_ERR, conn,
649 "sockfd_lookup failed %d\n", err);
650 return -EEXIST;
651 }
652
653 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
654 if (err)
655 goto free_socket;
656
657 spin_lock_bh(&session->lock);
658 /* bind iSCSI connection and socket */
659 tcp_sw_conn->sock = sock;
660 spin_unlock_bh(&session->lock);
661
662 /* setup Socket parameters */
663 sk = sock->sk;
664 sk->sk_reuse = 1;
665 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
666 sk->sk_allocation = GFP_ATOMIC;
667
668 iscsi_sw_tcp_conn_set_callbacks(conn);
669 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
670 /*
671 * set receive state machine into initial state
672 */
673 iscsi_tcp_hdr_recv_prep(tcp_conn);
674 return 0;
675
676free_socket:
677 sockfd_put(sock);
678 return err;
679}
680
681static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
682 enum iscsi_param param, char *buf,
683 int buflen)
684{
685 struct iscsi_conn *conn = cls_conn->dd_data;
686 struct iscsi_session *session = conn->session;
687 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
688 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
689 int value;
690
691 switch(param) {
692 case ISCSI_PARAM_HDRDGST_EN:
693 iscsi_set_param(cls_conn, param, buf, buflen);
694 break;
695 case ISCSI_PARAM_DATADGST_EN:
696 iscsi_set_param(cls_conn, param, buf, buflen);
697 tcp_sw_conn->sendpage = conn->datadgst_en ?
698 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
699 break;
700 case ISCSI_PARAM_MAX_R2T:
701 sscanf(buf, "%d", &value);
702 if (value <= 0 || !is_power_of_2(value))
703 return -EINVAL;
704 if (session->max_r2t == value)
705 break;
706 iscsi_tcp_r2tpool_free(session);
707 iscsi_set_param(cls_conn, param, buf, buflen);
708 if (iscsi_tcp_r2tpool_alloc(session))
709 return -ENOMEM;
710 break;
711 default:
712 return iscsi_set_param(cls_conn, param, buf, buflen);
713 }
714
715 return 0;
716}
717
718static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
719 enum iscsi_param param, char *buf)
720{
721 struct iscsi_conn *conn = cls_conn->dd_data;
722 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
723 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
724 struct sockaddr_in6 addr;
725 int rc, len;
726
727 switch(param) {
728 case ISCSI_PARAM_CONN_PORT:
729 case ISCSI_PARAM_CONN_ADDRESS:
730 spin_lock_bh(&conn->session->lock);
731 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
732 spin_unlock_bh(&conn->session->lock);
733 return -ENOTCONN;
734 }
735 rc = kernel_getpeername(tcp_sw_conn->sock,
736 (struct sockaddr *)&addr, &len);
737 spin_unlock_bh(&conn->session->lock);
738 if (rc)
739 return rc;
740
741 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
742 &addr, param, buf);
743 default:
744 return iscsi_conn_get_param(cls_conn, param, buf);
745 }
746
747 return 0;
748}
749
750static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
751 enum iscsi_host_param param, char *buf)
752{
753 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
754 struct iscsi_session *session = tcp_sw_host->session;
755 struct iscsi_conn *conn;
756 struct iscsi_tcp_conn *tcp_conn;
757 struct iscsi_sw_tcp_conn *tcp_sw_conn;
758 struct sockaddr_in6 addr;
759 int rc, len;
760
761 switch (param) {
762 case ISCSI_HOST_PARAM_IPADDRESS:
763 spin_lock_bh(&session->lock);
764 conn = session->leadconn;
765 if (!conn) {
766 spin_unlock_bh(&session->lock);
767 return -ENOTCONN;
768 }
769 tcp_conn = conn->dd_data;
770
771 tcp_sw_conn = tcp_conn->dd_data;
772 if (!tcp_sw_conn->sock) {
773 spin_unlock_bh(&session->lock);
774 return -ENOTCONN;
775 }
776
777 rc = kernel_getsockname(tcp_sw_conn->sock,
778 (struct sockaddr *)&addr, &len);
779 spin_unlock_bh(&session->lock);
780 if (rc)
781 return rc;
782
783 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
784 &addr, param, buf);
785 default:
786 return iscsi_host_get_param(shost, param, buf);
787 }
788
789 return 0;
790}
791
792static void
793iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
794 struct iscsi_stats *stats)
795{
796 struct iscsi_conn *conn = cls_conn->dd_data;
797 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
798 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
799
800 stats->custom_length = 3;
801 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
802 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
803 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
804 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
805 strcpy(stats->custom[2].desc, "eh_abort_cnt");
806 stats->custom[2].value = conn->eh_abort_cnt;
807
808 iscsi_tcp_conn_get_stats(cls_conn, stats);
809}
810
811static struct iscsi_cls_session *
812iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
813 uint16_t qdepth, uint32_t initial_cmdsn)
814{
815 struct iscsi_cls_session *cls_session;
816 struct iscsi_session *session;
817 struct iscsi_sw_tcp_host *tcp_sw_host;
818 struct Scsi_Host *shost;
819
820 if (ep) {
821 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
822 return NULL;
823 }
824
825 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
826 sizeof(struct iscsi_sw_tcp_host), 1);
827 if (!shost)
828 return NULL;
829 shost->transportt = iscsi_sw_tcp_scsi_transport;
830 shost->cmd_per_lun = qdepth;
831 shost->max_lun = iscsi_max_lun;
832 shost->max_id = 0;
833 shost->max_channel = 0;
834 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
835
836 if (iscsi_host_add(shost, NULL))
837 goto free_host;
838
839 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
840 cmds_max, 0,
841 sizeof(struct iscsi_tcp_task) +
842 sizeof(struct iscsi_sw_tcp_hdrbuf),
843 initial_cmdsn, 0);
844 if (!cls_session)
845 goto remove_host;
846 session = cls_session->dd_data;
847 tcp_sw_host = iscsi_host_priv(shost);
848 tcp_sw_host->session = session;
849
850 shost->can_queue = session->scsi_cmds_max;
851 if (iscsi_tcp_r2tpool_alloc(session))
852 goto remove_session;
853 return cls_session;
854
855remove_session:
856 iscsi_session_teardown(cls_session);
857remove_host:
858 iscsi_host_remove(shost);
859free_host:
860 iscsi_host_free(shost);
861 return NULL;
862}
863
864static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
865{
866 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
867
868 iscsi_tcp_r2tpool_free(cls_session->dd_data);
869 iscsi_session_teardown(cls_session);
870
871 iscsi_host_remove(shost);
872 iscsi_host_free(shost);
873}
874
875static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
876{
877 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
878 return 0;
879}
880
881static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
882{
883 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
884 blk_queue_dma_alignment(sdev->request_queue, 0);
885 return 0;
886}
887
888static struct scsi_host_template iscsi_sw_tcp_sht = {
889 .module = THIS_MODULE,
890 .name = "iSCSI Initiator over TCP/IP",
891 .queuecommand = iscsi_queuecommand,
892 .change_queue_depth = iscsi_change_queue_depth,
893 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
894 .sg_tablesize = 4096,
895 .max_sectors = 0xFFFF,
896 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
897 .eh_abort_handler = iscsi_eh_abort,
898 .eh_device_reset_handler= iscsi_eh_device_reset,
899 .eh_target_reset_handler = iscsi_eh_recover_target,
900 .use_clustering = DISABLE_CLUSTERING,
901 .slave_alloc = iscsi_sw_tcp_slave_alloc,
902 .slave_configure = iscsi_sw_tcp_slave_configure,
903 .target_alloc = iscsi_target_alloc,
904 .proc_name = "iscsi_tcp",
905 .this_id = -1,
906};
907
908static struct iscsi_transport iscsi_sw_tcp_transport = {
909 .owner = THIS_MODULE,
910 .name = "tcp",
911 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
912 | CAP_DATADGST,
913 .param_mask = ISCSI_MAX_RECV_DLENGTH |
914 ISCSI_MAX_XMIT_DLENGTH |
915 ISCSI_HDRDGST_EN |
916 ISCSI_DATADGST_EN |
917 ISCSI_INITIAL_R2T_EN |
918 ISCSI_MAX_R2T |
919 ISCSI_IMM_DATA_EN |
920 ISCSI_FIRST_BURST |
921 ISCSI_MAX_BURST |
922 ISCSI_PDU_INORDER_EN |
923 ISCSI_DATASEQ_INORDER_EN |
924 ISCSI_ERL |
925 ISCSI_CONN_PORT |
926 ISCSI_CONN_ADDRESS |
927 ISCSI_EXP_STATSN |
928 ISCSI_PERSISTENT_PORT |
929 ISCSI_PERSISTENT_ADDRESS |
930 ISCSI_TARGET_NAME | ISCSI_TPGT |
931 ISCSI_USERNAME | ISCSI_PASSWORD |
932 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
933 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
934 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
935 ISCSI_PING_TMO | ISCSI_RECV_TMO |
936 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
937 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
938 ISCSI_HOST_INITIATOR_NAME |
939 ISCSI_HOST_NETDEV_NAME,
940 /* session management */
941 .create_session = iscsi_sw_tcp_session_create,
942 .destroy_session = iscsi_sw_tcp_session_destroy,
943 /* connection management */
944 .create_conn = iscsi_sw_tcp_conn_create,
945 .bind_conn = iscsi_sw_tcp_conn_bind,
946 .destroy_conn = iscsi_sw_tcp_conn_destroy,
947 .set_param = iscsi_sw_tcp_conn_set_param,
948 .get_conn_param = iscsi_sw_tcp_conn_get_param,
949 .get_session_param = iscsi_session_get_param,
950 .start_conn = iscsi_conn_start,
951 .stop_conn = iscsi_sw_tcp_conn_stop,
952 /* iscsi host params */
953 .get_host_param = iscsi_sw_tcp_host_get_param,
954 .set_host_param = iscsi_host_set_param,
955 /* IO */
956 .send_pdu = iscsi_conn_send_pdu,
957 .get_stats = iscsi_sw_tcp_conn_get_stats,
958 /* iscsi task/cmd helpers */
959 .init_task = iscsi_tcp_task_init,
960 .xmit_task = iscsi_tcp_task_xmit,
961 .cleanup_task = iscsi_tcp_cleanup_task,
962 /* low level pdu helpers */
963 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
964 .init_pdu = iscsi_sw_tcp_pdu_init,
965 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
966 /* recovery */
967 .session_recovery_timedout = iscsi_session_recovery_timedout,
968};
969
970static int __init iscsi_sw_tcp_init(void)
971{
972 if (iscsi_max_lun < 1) {
973 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
974 iscsi_max_lun);
975 return -EINVAL;
976 }
977
978 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
979 &iscsi_sw_tcp_transport);
980 if (!iscsi_sw_tcp_scsi_transport)
981 return -ENODEV;
982
983 return 0;
984}
985
986static void __exit iscsi_sw_tcp_exit(void)
987{
988 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
989}
990
991module_init(iscsi_sw_tcp_init);
992module_exit(iscsi_sw_tcp_exit);
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#include <trace/events/sock.h>
40
41#include "iscsi_tcp.h"
42
43MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
44 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
45 "Alex Aizman <itn780@yahoo.com>");
46MODULE_DESCRIPTION("iSCSI/TCP data-path");
47MODULE_LICENSE("GPL");
48
49static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
50static const struct scsi_host_template iscsi_sw_tcp_sht;
51static struct iscsi_transport iscsi_sw_tcp_transport;
52
53static unsigned int iscsi_max_lun = ~0;
54module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
55
56static bool iscsi_recv_from_iscsi_q;
57module_param_named(recv_from_iscsi_q, iscsi_recv_from_iscsi_q, bool, 0644);
58MODULE_PARM_DESC(recv_from_iscsi_q, "Set to true to read iSCSI data/headers from the iscsi_q workqueue. The default is false which will perform reads from the network softirq context.");
59
60static int iscsi_sw_tcp_dbg;
61module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
62 S_IRUGO | S_IWUSR);
63MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
64 "Set to 1 to turn on, and zero to turn off. Default is off.");
65
66#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
67 do { \
68 if (iscsi_sw_tcp_dbg) \
69 iscsi_conn_printk(KERN_INFO, _conn, \
70 "%s " dbg_fmt, \
71 __func__, ##arg); \
72 iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \
73 &(_conn)->cls_conn->dev, \
74 "%s " dbg_fmt, __func__, ##arg);\
75 } while (0);
76
77
78/**
79 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
80 * @rd_desc: read descriptor
81 * @skb: socket buffer
82 * @offset: offset in skb
83 * @len: skb->len - offset
84 */
85static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
86 unsigned int offset, size_t len)
87{
88 struct iscsi_conn *conn = rd_desc->arg.data;
89 unsigned int consumed, total_consumed = 0;
90 int status;
91
92 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
93
94 do {
95 status = 0;
96 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
97 offset += consumed;
98 total_consumed += consumed;
99 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
100
101 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
102 skb->len - offset, status);
103 return total_consumed;
104}
105
106/**
107 * iscsi_sw_sk_state_check - check socket state
108 * @sk: socket
109 *
110 * If the socket is in CLOSE or CLOSE_WAIT we should
111 * not close the connection if there is still some
112 * data pending.
113 *
114 * Must be called with sk_callback_lock.
115 */
116static inline int iscsi_sw_sk_state_check(struct sock *sk)
117{
118 struct iscsi_conn *conn = sk->sk_user_data;
119
120 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
121 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
122 !atomic_read(&sk->sk_rmem_alloc)) {
123 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
124 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
125 return -ECONNRESET;
126 }
127 return 0;
128}
129
130static void iscsi_sw_tcp_recv_data(struct iscsi_conn *conn)
131{
132 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
133 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
134 struct sock *sk = tcp_sw_conn->sock->sk;
135 read_descriptor_t rd_desc;
136
137 /*
138 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
139 * We set count to 1 because we want the network layer to
140 * hand us all the skbs that are available. iscsi_tcp_recv
141 * handled pdus that cross buffers or pdus that still need data.
142 */
143 rd_desc.arg.data = conn;
144 rd_desc.count = 1;
145
146 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
147
148 /* If we had to (atomically) map a highmem page,
149 * unmap it now. */
150 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
151
152 iscsi_sw_sk_state_check(sk);
153}
154
155static void iscsi_sw_tcp_recv_data_work(struct work_struct *work)
156{
157 struct iscsi_conn *conn = container_of(work, struct iscsi_conn,
158 recvwork);
159 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
160 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
161 struct sock *sk = tcp_sw_conn->sock->sk;
162
163 lock_sock(sk);
164 iscsi_sw_tcp_recv_data(conn);
165 release_sock(sk);
166}
167
168static void iscsi_sw_tcp_data_ready(struct sock *sk)
169{
170 struct iscsi_sw_tcp_conn *tcp_sw_conn;
171 struct iscsi_tcp_conn *tcp_conn;
172 struct iscsi_conn *conn;
173
174 trace_sk_data_ready(sk);
175
176 read_lock_bh(&sk->sk_callback_lock);
177 conn = sk->sk_user_data;
178 if (!conn) {
179 read_unlock_bh(&sk->sk_callback_lock);
180 return;
181 }
182 tcp_conn = conn->dd_data;
183 tcp_sw_conn = tcp_conn->dd_data;
184
185 if (tcp_sw_conn->queue_recv)
186 iscsi_conn_queue_recv(conn);
187 else
188 iscsi_sw_tcp_recv_data(conn);
189 read_unlock_bh(&sk->sk_callback_lock);
190}
191
192static void iscsi_sw_tcp_state_change(struct sock *sk)
193{
194 struct iscsi_tcp_conn *tcp_conn;
195 struct iscsi_sw_tcp_conn *tcp_sw_conn;
196 struct iscsi_conn *conn;
197 void (*old_state_change)(struct sock *);
198
199 read_lock_bh(&sk->sk_callback_lock);
200 conn = sk->sk_user_data;
201 if (!conn) {
202 read_unlock_bh(&sk->sk_callback_lock);
203 return;
204 }
205
206 iscsi_sw_sk_state_check(sk);
207
208 tcp_conn = conn->dd_data;
209 tcp_sw_conn = tcp_conn->dd_data;
210 old_state_change = tcp_sw_conn->old_state_change;
211
212 read_unlock_bh(&sk->sk_callback_lock);
213
214 old_state_change(sk);
215}
216
217/**
218 * iscsi_sw_tcp_write_space - Called when more output buffer space is available
219 * @sk: socket space is available for
220 **/
221static void iscsi_sw_tcp_write_space(struct sock *sk)
222{
223 struct iscsi_conn *conn;
224 struct iscsi_tcp_conn *tcp_conn;
225 struct iscsi_sw_tcp_conn *tcp_sw_conn;
226 void (*old_write_space)(struct sock *);
227
228 read_lock_bh(&sk->sk_callback_lock);
229 conn = sk->sk_user_data;
230 if (!conn) {
231 read_unlock_bh(&sk->sk_callback_lock);
232 return;
233 }
234
235 tcp_conn = conn->dd_data;
236 tcp_sw_conn = tcp_conn->dd_data;
237 old_write_space = tcp_sw_conn->old_write_space;
238 read_unlock_bh(&sk->sk_callback_lock);
239
240 old_write_space(sk);
241
242 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
243 iscsi_conn_queue_xmit(conn);
244}
245
246static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
247{
248 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
249 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
250 struct sock *sk = tcp_sw_conn->sock->sk;
251
252 /* assign new callbacks */
253 write_lock_bh(&sk->sk_callback_lock);
254 sk->sk_user_data = conn;
255 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
256 tcp_sw_conn->old_state_change = sk->sk_state_change;
257 tcp_sw_conn->old_write_space = sk->sk_write_space;
258 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
259 sk->sk_state_change = iscsi_sw_tcp_state_change;
260 sk->sk_write_space = iscsi_sw_tcp_write_space;
261 write_unlock_bh(&sk->sk_callback_lock);
262}
263
264static void
265iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
266{
267 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
268 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
269 struct sock *sk = tcp_sw_conn->sock->sk;
270
271 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
272 write_lock_bh(&sk->sk_callback_lock);
273 sk->sk_user_data = NULL;
274 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
275 sk->sk_state_change = tcp_sw_conn->old_state_change;
276 sk->sk_write_space = tcp_sw_conn->old_write_space;
277 sk->sk_no_check_tx = 0;
278 write_unlock_bh(&sk->sk_callback_lock);
279}
280
281/**
282 * iscsi_sw_tcp_xmit_segment - transmit segment
283 * @tcp_conn: the iSCSI TCP connection
284 * @segment: the buffer to transmnit
285 *
286 * This function transmits as much of the buffer as
287 * the network layer will accept, and returns the number of
288 * bytes transmitted.
289 *
290 * If CRC hashing is enabled, the function will compute the
291 * hash as it goes. When the entire segment has been transmitted,
292 * it will retrieve the hash value and send it as well.
293 */
294static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
295 struct iscsi_segment *segment)
296{
297 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
298 struct socket *sk = tcp_sw_conn->sock;
299 unsigned int copied = 0;
300 int r = 0;
301
302 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
303 struct scatterlist *sg;
304 struct msghdr msg = {};
305 struct bio_vec bv;
306 unsigned int offset, copy;
307
308 r = 0;
309 offset = segment->copied;
310 copy = segment->size - offset;
311
312 if (segment->total_copied + segment->size < segment->total_size)
313 msg.msg_flags |= MSG_MORE;
314
315 if (tcp_sw_conn->queue_recv)
316 msg.msg_flags |= MSG_DONTWAIT;
317
318 if (!segment->data) {
319 if (!tcp_conn->iscsi_conn->datadgst_en)
320 msg.msg_flags |= MSG_SPLICE_PAGES;
321 sg = segment->sg;
322 offset += segment->sg_offset + sg->offset;
323 bvec_set_page(&bv, sg_page(sg), copy, offset);
324 } else {
325 bvec_set_virt(&bv, segment->data + offset, copy);
326 }
327 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bv, 1, copy);
328
329 r = sock_sendmsg(sk, &msg);
330 if (r < 0) {
331 iscsi_tcp_segment_unmap(segment);
332 return r;
333 }
334 copied += r;
335 }
336 return copied;
337}
338
339/**
340 * iscsi_sw_tcp_xmit - TCP transmit
341 * @conn: iscsi connection
342 **/
343static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
344{
345 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
346 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
347 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
348 unsigned int consumed = 0;
349 int rc = 0;
350
351 while (1) {
352 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
353 /*
354 * We may not have been able to send data because the conn
355 * is getting stopped. libiscsi will know so propagate err
356 * for it to do the right thing.
357 */
358 if (rc == -EAGAIN)
359 return rc;
360 else if (rc < 0) {
361 rc = ISCSI_ERR_XMIT_FAILED;
362 goto error;
363 } else if (rc == 0)
364 break;
365
366 consumed += rc;
367
368 if (segment->total_copied >= segment->total_size) {
369 if (segment->done != NULL) {
370 rc = segment->done(tcp_conn, segment);
371 if (rc != 0)
372 goto error;
373 }
374 }
375 }
376
377 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
378
379 conn->txdata_octets += consumed;
380 return consumed;
381
382error:
383 /* Transmit error. We could initiate error recovery
384 * here. */
385 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
386 iscsi_conn_failure(conn, rc);
387 return -EIO;
388}
389
390/**
391 * iscsi_sw_tcp_xmit_qlen - return the number of bytes queued for xmit
392 * @conn: iscsi connection
393 */
394static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
395{
396 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
397 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
398 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
399
400 return segment->total_copied - segment->total_size;
401}
402
403static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
404{
405 struct iscsi_conn *conn = task->conn;
406 unsigned int noreclaim_flag;
407 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
408 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
409 int rc = 0;
410
411 if (!tcp_sw_conn->sock) {
412 iscsi_conn_printk(KERN_ERR, conn,
413 "Transport not bound to socket!\n");
414 return -EINVAL;
415 }
416
417 noreclaim_flag = memalloc_noreclaim_save();
418
419 while (iscsi_sw_tcp_xmit_qlen(conn)) {
420 rc = iscsi_sw_tcp_xmit(conn);
421 if (rc == 0) {
422 rc = -EAGAIN;
423 break;
424 }
425 if (rc < 0)
426 break;
427 rc = 0;
428 }
429
430 memalloc_noreclaim_restore(noreclaim_flag);
431 return rc;
432}
433
434/*
435 * This is called when we're done sending the header.
436 * Simply copy the data_segment to the send segment, and return.
437 */
438static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
439 struct iscsi_segment *segment)
440{
441 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
442
443 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
444 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
445 "Header done. Next segment size %u total_size %u\n",
446 tcp_sw_conn->out.segment.size,
447 tcp_sw_conn->out.segment.total_size);
448 return 0;
449}
450
451static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
452 size_t hdrlen)
453{
454 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
455 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
456
457 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
458 "digest enabled" : "digest disabled");
459
460 /* Clear the data segment - needs to be filled in by the
461 * caller using iscsi_tcp_send_data_prep() */
462 memset(&tcp_sw_conn->out.data_segment, 0,
463 sizeof(struct iscsi_segment));
464
465 /* If header digest is enabled, compute the CRC and
466 * place the digest into the same buffer. We make
467 * sure that both iscsi_tcp_task and mtask have
468 * sufficient room.
469 */
470 if (conn->hdrdgst_en) {
471 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
472 hdr + hdrlen);
473 hdrlen += ISCSI_DIGEST_SIZE;
474 }
475
476 /* Remember header pointer for later, when we need
477 * to decide whether there's a payload to go along
478 * with the header. */
479 tcp_sw_conn->out.hdr = hdr;
480
481 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
482 iscsi_sw_tcp_send_hdr_done, NULL);
483}
484
485/*
486 * Prepare the send buffer for the payload data.
487 * Padding and checksumming will all be taken care
488 * of by the iscsi_segment routines.
489 */
490static int
491iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
492 unsigned int count, unsigned int offset,
493 unsigned int len)
494{
495 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
496 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
497 struct ahash_request *tx_hash = NULL;
498 unsigned int hdr_spec_len;
499
500 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
501 conn->datadgst_en ?
502 "digest enabled" : "digest disabled");
503
504 /* Make sure the datalen matches what the caller
505 said he would send. */
506 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
507 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
508
509 if (conn->datadgst_en)
510 tx_hash = tcp_sw_conn->tx_hash;
511
512 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
513 sg, count, offset, len,
514 NULL, tx_hash);
515}
516
517static void
518iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
519 size_t len)
520{
521 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
522 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
523 struct ahash_request *tx_hash = NULL;
524 unsigned int hdr_spec_len;
525
526 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
527 "digest enabled" : "digest disabled");
528
529 /* Make sure the datalen matches what the caller
530 said he would send. */
531 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
532 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
533
534 if (conn->datadgst_en)
535 tx_hash = tcp_sw_conn->tx_hash;
536
537 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
538 data, len, NULL, tx_hash);
539}
540
541static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
542 unsigned int offset, unsigned int count)
543{
544 struct iscsi_conn *conn = task->conn;
545 int err = 0;
546
547 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
548
549 if (!count)
550 return 0;
551
552 if (!task->sc)
553 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
554 else {
555 struct scsi_data_buffer *sdb = &task->sc->sdb;
556
557 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
558 sdb->table.nents, offset,
559 count);
560 }
561
562 if (err) {
563 /* got invalid offset/len */
564 return -EIO;
565 }
566 return 0;
567}
568
569static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
570{
571 struct iscsi_tcp_task *tcp_task = task->dd_data;
572
573 task->hdr = task->dd_data + sizeof(*tcp_task);
574 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
575 return 0;
576}
577
578static struct iscsi_cls_conn *
579iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
580 uint32_t conn_idx)
581{
582 struct iscsi_conn *conn;
583 struct iscsi_cls_conn *cls_conn;
584 struct iscsi_tcp_conn *tcp_conn;
585 struct iscsi_sw_tcp_conn *tcp_sw_conn;
586 struct crypto_ahash *tfm;
587
588 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
589 conn_idx);
590 if (!cls_conn)
591 return NULL;
592 conn = cls_conn->dd_data;
593 tcp_conn = conn->dd_data;
594 tcp_sw_conn = tcp_conn->dd_data;
595 INIT_WORK(&conn->recvwork, iscsi_sw_tcp_recv_data_work);
596 tcp_sw_conn->queue_recv = iscsi_recv_from_iscsi_q;
597
598 mutex_init(&tcp_sw_conn->sock_lock);
599
600 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
601 if (IS_ERR(tfm))
602 goto free_conn;
603
604 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
605 if (!tcp_sw_conn->tx_hash)
606 goto free_tfm;
607 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
608
609 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
610 if (!tcp_sw_conn->rx_hash)
611 goto free_tx_hash;
612 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
613
614 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
615
616 return cls_conn;
617
618free_tx_hash:
619 ahash_request_free(tcp_sw_conn->tx_hash);
620free_tfm:
621 crypto_free_ahash(tfm);
622free_conn:
623 iscsi_conn_printk(KERN_ERR, conn,
624 "Could not create connection due to crc32c "
625 "loading error. Make sure the crc32c "
626 "module is built as a module or into the "
627 "kernel\n");
628 iscsi_tcp_conn_teardown(cls_conn);
629 return NULL;
630}
631
632static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
633{
634 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
635 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
636 struct socket *sock = tcp_sw_conn->sock;
637
638 /*
639 * The iscsi transport class will make sure we are not called in
640 * parallel with start, stop, bind and destroys. However, this can be
641 * called twice if userspace does a stop then a destroy.
642 */
643 if (!sock)
644 return;
645
646 /*
647 * Make sure we start socket shutdown now in case userspace is up
648 * but delayed in releasing the socket.
649 */
650 kernel_sock_shutdown(sock, SHUT_RDWR);
651
652 sock_hold(sock->sk);
653 iscsi_sw_tcp_conn_restore_callbacks(conn);
654 sock_put(sock->sk);
655
656 iscsi_suspend_rx(conn);
657
658 mutex_lock(&tcp_sw_conn->sock_lock);
659 tcp_sw_conn->sock = NULL;
660 mutex_unlock(&tcp_sw_conn->sock_lock);
661 sockfd_put(sock);
662}
663
664static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
665{
666 struct iscsi_conn *conn = cls_conn->dd_data;
667 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
668 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
669
670 iscsi_sw_tcp_release_conn(conn);
671
672 ahash_request_free(tcp_sw_conn->rx_hash);
673 if (tcp_sw_conn->tx_hash) {
674 struct crypto_ahash *tfm;
675
676 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
677 ahash_request_free(tcp_sw_conn->tx_hash);
678 crypto_free_ahash(tfm);
679 }
680
681 iscsi_tcp_conn_teardown(cls_conn);
682}
683
684static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
685{
686 struct iscsi_conn *conn = cls_conn->dd_data;
687 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
688 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
689 struct socket *sock = tcp_sw_conn->sock;
690
691 /* userspace may have goofed up and not bound us */
692 if (!sock)
693 return;
694
695 sock->sk->sk_err = EIO;
696 wake_up_interruptible(sk_sleep(sock->sk));
697
698 /* stop xmit side */
699 iscsi_suspend_tx(conn);
700
701 /* stop recv side and release socket */
702 iscsi_sw_tcp_release_conn(conn);
703
704 iscsi_conn_stop(cls_conn, flag);
705}
706
707static int
708iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
709 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
710 int is_leading)
711{
712 struct iscsi_conn *conn = cls_conn->dd_data;
713 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
714 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
715 struct sock *sk;
716 struct socket *sock;
717 int err;
718
719 /* lookup for existing socket */
720 sock = sockfd_lookup((int)transport_eph, &err);
721 if (!sock) {
722 iscsi_conn_printk(KERN_ERR, conn,
723 "sockfd_lookup failed %d\n", err);
724 return -EEXIST;
725 }
726
727 err = -EINVAL;
728 if (!sk_is_tcp(sock->sk))
729 goto free_socket;
730
731 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
732 if (err)
733 goto free_socket;
734
735 mutex_lock(&tcp_sw_conn->sock_lock);
736 /* bind iSCSI connection and socket */
737 tcp_sw_conn->sock = sock;
738 mutex_unlock(&tcp_sw_conn->sock_lock);
739
740 /* setup Socket parameters */
741 sk = sock->sk;
742 sk->sk_reuse = SK_CAN_REUSE;
743 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
744 sk->sk_allocation = GFP_ATOMIC;
745 sk->sk_use_task_frag = false;
746 sk_set_memalloc(sk);
747 sock_no_linger(sk);
748
749 iscsi_sw_tcp_conn_set_callbacks(conn);
750 /*
751 * set receive state machine into initial state
752 */
753 iscsi_tcp_hdr_recv_prep(tcp_conn);
754 return 0;
755
756free_socket:
757 sockfd_put(sock);
758 return err;
759}
760
761static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
762 enum iscsi_param param, char *buf,
763 int buflen)
764{
765 struct iscsi_conn *conn = cls_conn->dd_data;
766 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
767 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
768
769 switch(param) {
770 case ISCSI_PARAM_HDRDGST_EN:
771 iscsi_set_param(cls_conn, param, buf, buflen);
772 break;
773 case ISCSI_PARAM_DATADGST_EN:
774 mutex_lock(&tcp_sw_conn->sock_lock);
775 if (!tcp_sw_conn->sock) {
776 mutex_unlock(&tcp_sw_conn->sock_lock);
777 return -ENOTCONN;
778 }
779 iscsi_set_param(cls_conn, param, buf, buflen);
780 mutex_unlock(&tcp_sw_conn->sock_lock);
781 break;
782 case ISCSI_PARAM_MAX_R2T:
783 return iscsi_tcp_set_max_r2t(conn, buf);
784 default:
785 return iscsi_set_param(cls_conn, param, buf, buflen);
786 }
787
788 return 0;
789}
790
791static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
792 enum iscsi_param param, char *buf)
793{
794 struct iscsi_conn *conn = cls_conn->dd_data;
795 struct iscsi_sw_tcp_conn *tcp_sw_conn;
796 struct iscsi_tcp_conn *tcp_conn;
797 struct sockaddr_in6 addr;
798 struct socket *sock;
799 int rc;
800
801 switch(param) {
802 case ISCSI_PARAM_CONN_PORT:
803 case ISCSI_PARAM_CONN_ADDRESS:
804 case ISCSI_PARAM_LOCAL_PORT:
805 spin_lock_bh(&conn->session->frwd_lock);
806 if (!conn->session->leadconn) {
807 spin_unlock_bh(&conn->session->frwd_lock);
808 return -ENOTCONN;
809 }
810 /*
811 * The conn has been setup and bound, so just grab a ref
812 * incase a destroy runs while we are in the net layer.
813 */
814 iscsi_get_conn(conn->cls_conn);
815 spin_unlock_bh(&conn->session->frwd_lock);
816
817 tcp_conn = conn->dd_data;
818 tcp_sw_conn = tcp_conn->dd_data;
819
820 mutex_lock(&tcp_sw_conn->sock_lock);
821 sock = tcp_sw_conn->sock;
822 if (!sock) {
823 rc = -ENOTCONN;
824 goto sock_unlock;
825 }
826
827 if (param == ISCSI_PARAM_LOCAL_PORT)
828 rc = kernel_getsockname(sock,
829 (struct sockaddr *)&addr);
830 else
831 rc = kernel_getpeername(sock,
832 (struct sockaddr *)&addr);
833sock_unlock:
834 mutex_unlock(&tcp_sw_conn->sock_lock);
835 iscsi_put_conn(conn->cls_conn);
836 if (rc < 0)
837 return rc;
838
839 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
840 &addr, param, buf);
841 default:
842 return iscsi_conn_get_param(cls_conn, param, buf);
843 }
844
845 return 0;
846}
847
848static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
849 enum iscsi_host_param param, char *buf)
850{
851 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
852 struct iscsi_session *session;
853 struct iscsi_conn *conn;
854 struct iscsi_tcp_conn *tcp_conn;
855 struct iscsi_sw_tcp_conn *tcp_sw_conn;
856 struct sockaddr_in6 addr;
857 struct socket *sock;
858 int rc;
859
860 switch (param) {
861 case ISCSI_HOST_PARAM_IPADDRESS:
862 session = tcp_sw_host->session;
863 if (!session)
864 return -ENOTCONN;
865
866 spin_lock_bh(&session->frwd_lock);
867 conn = session->leadconn;
868 if (!conn) {
869 spin_unlock_bh(&session->frwd_lock);
870 return -ENOTCONN;
871 }
872 tcp_conn = conn->dd_data;
873 tcp_sw_conn = tcp_conn->dd_data;
874 /*
875 * The conn has been setup and bound, so just grab a ref
876 * incase a destroy runs while we are in the net layer.
877 */
878 iscsi_get_conn(conn->cls_conn);
879 spin_unlock_bh(&session->frwd_lock);
880
881 mutex_lock(&tcp_sw_conn->sock_lock);
882 sock = tcp_sw_conn->sock;
883 if (!sock)
884 rc = -ENOTCONN;
885 else
886 rc = kernel_getsockname(sock, (struct sockaddr *)&addr);
887 mutex_unlock(&tcp_sw_conn->sock_lock);
888 iscsi_put_conn(conn->cls_conn);
889 if (rc < 0)
890 return rc;
891
892 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
893 &addr,
894 (enum iscsi_param)param, buf);
895 default:
896 return iscsi_host_get_param(shost, param, buf);
897 }
898
899 return 0;
900}
901
902static void
903iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
904 struct iscsi_stats *stats)
905{
906 struct iscsi_conn *conn = cls_conn->dd_data;
907 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
908 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
909
910 stats->custom_length = 3;
911 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
912 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
913 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
914 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
915 strcpy(stats->custom[2].desc, "eh_abort_cnt");
916 stats->custom[2].value = conn->eh_abort_cnt;
917
918 iscsi_tcp_conn_get_stats(cls_conn, stats);
919}
920
921static struct iscsi_cls_session *
922iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
923 uint16_t qdepth, uint32_t initial_cmdsn)
924{
925 struct iscsi_cls_session *cls_session;
926 struct iscsi_session *session;
927 struct iscsi_sw_tcp_host *tcp_sw_host;
928 struct Scsi_Host *shost;
929 int rc;
930
931 if (ep) {
932 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
933 return NULL;
934 }
935
936 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
937 sizeof(struct iscsi_sw_tcp_host), 1);
938 if (!shost)
939 return NULL;
940 shost->transportt = iscsi_sw_tcp_scsi_transport;
941 shost->cmd_per_lun = qdepth;
942 shost->max_lun = iscsi_max_lun;
943 shost->max_id = 0;
944 shost->max_channel = 0;
945 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
946
947 rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
948 if (rc < 0)
949 goto free_host;
950 shost->can_queue = rc;
951
952 if (iscsi_host_add(shost, NULL))
953 goto free_host;
954
955 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
956 cmds_max, 0,
957 sizeof(struct iscsi_tcp_task) +
958 sizeof(struct iscsi_sw_tcp_hdrbuf),
959 initial_cmdsn, 0);
960 if (!cls_session)
961 goto remove_host;
962 session = cls_session->dd_data;
963
964 if (iscsi_tcp_r2tpool_alloc(session))
965 goto remove_session;
966
967 /* We are now fully setup so expose the session to sysfs. */
968 tcp_sw_host = iscsi_host_priv(shost);
969 tcp_sw_host->session = session;
970 return cls_session;
971
972remove_session:
973 iscsi_session_teardown(cls_session);
974remove_host:
975 iscsi_host_remove(shost, false);
976free_host:
977 iscsi_host_free(shost);
978 return NULL;
979}
980
981static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
982{
983 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
984 struct iscsi_session *session = cls_session->dd_data;
985
986 if (WARN_ON_ONCE(session->leadconn))
987 return;
988
989 iscsi_session_remove(cls_session);
990 /*
991 * Our get_host_param needs to access the session, so remove the
992 * host from sysfs before freeing the session to make sure userspace
993 * is no longer accessing the callout.
994 */
995 iscsi_host_remove(shost, false);
996
997 iscsi_tcp_r2tpool_free(cls_session->dd_data);
998
999 iscsi_session_free(cls_session);
1000 iscsi_host_free(shost);
1001}
1002
1003static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
1004{
1005 switch (param_type) {
1006 case ISCSI_HOST_PARAM:
1007 switch (param) {
1008 case ISCSI_HOST_PARAM_NETDEV_NAME:
1009 case ISCSI_HOST_PARAM_HWADDRESS:
1010 case ISCSI_HOST_PARAM_IPADDRESS:
1011 case ISCSI_HOST_PARAM_INITIATOR_NAME:
1012 return S_IRUGO;
1013 default:
1014 return 0;
1015 }
1016 case ISCSI_PARAM:
1017 switch (param) {
1018 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1019 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1020 case ISCSI_PARAM_HDRDGST_EN:
1021 case ISCSI_PARAM_DATADGST_EN:
1022 case ISCSI_PARAM_CONN_ADDRESS:
1023 case ISCSI_PARAM_CONN_PORT:
1024 case ISCSI_PARAM_LOCAL_PORT:
1025 case ISCSI_PARAM_EXP_STATSN:
1026 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1027 case ISCSI_PARAM_PERSISTENT_PORT:
1028 case ISCSI_PARAM_PING_TMO:
1029 case ISCSI_PARAM_RECV_TMO:
1030 case ISCSI_PARAM_INITIAL_R2T_EN:
1031 case ISCSI_PARAM_MAX_R2T:
1032 case ISCSI_PARAM_IMM_DATA_EN:
1033 case ISCSI_PARAM_FIRST_BURST:
1034 case ISCSI_PARAM_MAX_BURST:
1035 case ISCSI_PARAM_PDU_INORDER_EN:
1036 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1037 case ISCSI_PARAM_ERL:
1038 case ISCSI_PARAM_TARGET_NAME:
1039 case ISCSI_PARAM_TPGT:
1040 case ISCSI_PARAM_USERNAME:
1041 case ISCSI_PARAM_PASSWORD:
1042 case ISCSI_PARAM_USERNAME_IN:
1043 case ISCSI_PARAM_PASSWORD_IN:
1044 case ISCSI_PARAM_FAST_ABORT:
1045 case ISCSI_PARAM_ABORT_TMO:
1046 case ISCSI_PARAM_LU_RESET_TMO:
1047 case ISCSI_PARAM_TGT_RESET_TMO:
1048 case ISCSI_PARAM_IFACE_NAME:
1049 case ISCSI_PARAM_INITIATOR_NAME:
1050 return S_IRUGO;
1051 default:
1052 return 0;
1053 }
1054 }
1055
1056 return 0;
1057}
1058
1059static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
1060{
1061 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
1062 struct iscsi_session *session = tcp_sw_host->session;
1063 struct iscsi_conn *conn = session->leadconn;
1064
1065 if (conn->datadgst_en)
1066 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
1067 sdev->request_queue);
1068 blk_queue_dma_alignment(sdev->request_queue, 0);
1069 return 0;
1070}
1071
1072static const struct scsi_host_template iscsi_sw_tcp_sht = {
1073 .module = THIS_MODULE,
1074 .name = "iSCSI Initiator over TCP/IP",
1075 .queuecommand = iscsi_queuecommand,
1076 .change_queue_depth = scsi_change_queue_depth,
1077 .can_queue = ISCSI_TOTAL_CMDS_MAX,
1078 .sg_tablesize = 4096,
1079 .max_sectors = 0xFFFF,
1080 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
1081 .eh_timed_out = iscsi_eh_cmd_timed_out,
1082 .eh_abort_handler = iscsi_eh_abort,
1083 .eh_device_reset_handler= iscsi_eh_device_reset,
1084 .eh_target_reset_handler = iscsi_eh_recover_target,
1085 .dma_boundary = PAGE_SIZE - 1,
1086 .slave_configure = iscsi_sw_tcp_slave_configure,
1087 .proc_name = "iscsi_tcp",
1088 .this_id = -1,
1089 .track_queue_depth = 1,
1090 .cmd_size = sizeof(struct iscsi_cmd),
1091};
1092
1093static struct iscsi_transport iscsi_sw_tcp_transport = {
1094 .owner = THIS_MODULE,
1095 .name = "tcp",
1096 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
1097 | CAP_DATADGST,
1098 /* session management */
1099 .create_session = iscsi_sw_tcp_session_create,
1100 .destroy_session = iscsi_sw_tcp_session_destroy,
1101 /* connection management */
1102 .create_conn = iscsi_sw_tcp_conn_create,
1103 .bind_conn = iscsi_sw_tcp_conn_bind,
1104 .destroy_conn = iscsi_sw_tcp_conn_destroy,
1105 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
1106 .set_param = iscsi_sw_tcp_conn_set_param,
1107 .get_conn_param = iscsi_sw_tcp_conn_get_param,
1108 .get_session_param = iscsi_session_get_param,
1109 .start_conn = iscsi_conn_start,
1110 .stop_conn = iscsi_sw_tcp_conn_stop,
1111 /* iscsi host params */
1112 .get_host_param = iscsi_sw_tcp_host_get_param,
1113 .set_host_param = iscsi_host_set_param,
1114 /* IO */
1115 .send_pdu = iscsi_conn_send_pdu,
1116 .get_stats = iscsi_sw_tcp_conn_get_stats,
1117 /* iscsi task/cmd helpers */
1118 .init_task = iscsi_tcp_task_init,
1119 .xmit_task = iscsi_tcp_task_xmit,
1120 .cleanup_task = iscsi_tcp_cleanup_task,
1121 /* low level pdu helpers */
1122 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1123 .init_pdu = iscsi_sw_tcp_pdu_init,
1124 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
1125 /* recovery */
1126 .session_recovery_timedout = iscsi_session_recovery_timedout,
1127};
1128
1129static int __init iscsi_sw_tcp_init(void)
1130{
1131 if (iscsi_max_lun < 1) {
1132 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1133 iscsi_max_lun);
1134 return -EINVAL;
1135 }
1136
1137 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1138 &iscsi_sw_tcp_transport);
1139 if (!iscsi_sw_tcp_scsi_transport)
1140 return -ENODEV;
1141
1142 return 0;
1143}
1144
1145static void __exit iscsi_sw_tcp_exit(void)
1146{
1147 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
1148}
1149
1150module_init(iscsi_sw_tcp_init);
1151module_exit(iscsi_sw_tcp_exit);