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Alex Aizman7ba24712005-08-04 19:30:08 -07001/*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
Mike Christie5bb0b552006-04-06 21:26:46 -05006 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
Alex Aizman7ba24712005-08-04 19:30:08 -07008 * 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
Herbert Xu5d6ac292016-01-24 21:19:41 +080029#include <crypto/hash.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070030#include <linux/types.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070031#include <linux/inet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Vlastimil Babkaf1083042017-05-08 15:59:53 -070033#include <linux/sched/mm.h>
Mike Christie4e7aba72007-05-30 12:57:23 -050034#include <linux/file.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070035#include <linux/blkdev.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070036#include <linux/delay.h>
37#include <linux/kfifo.h>
38#include <linux/scatterlist.h>
Paul Gortmakeracf3368f2011-05-27 09:47:43 -040039#include <linux/module.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070040#include <net/tcp.h>
41#include <scsi/scsi_cmnd.h>
Mike Christied1d81c02007-05-30 12:57:21 -050042#include <scsi/scsi_device.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070043#include <scsi/scsi_host.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_transport_iscsi.h>
46
47#include "iscsi_tcp.h"
48
Mike Christie38e1a8f2008-12-02 00:32:12 -060049MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
50 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
Alex Aizman7ba24712005-08-04 19:30:08 -070051 "Alex Aizman <itn780@yahoo.com>");
52MODULE_DESCRIPTION("iSCSI/TCP data-path");
53MODULE_LICENSE("GPL");
Alex Aizman7ba24712005-08-04 19:30:08 -070054
Mike Christie38e1a8f2008-12-02 00:32:12 -060055static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
56static struct scsi_host_template iscsi_sw_tcp_sht;
57static struct iscsi_transport iscsi_sw_tcp_transport;
Mike Christie75613522008-05-21 15:53:59 -050058
Rob Eversc0e4eaa2012-08-15 18:39:34 -040059static unsigned int iscsi_max_lun = ~0;
Alex Aizman7ba24712005-08-04 19:30:08 -070060module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
61
Mike Christiec93f87c2009-03-05 14:46:00 -060062static int iscsi_sw_tcp_dbg;
63module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
64 S_IRUGO | S_IWUSR);
65MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
66 "Set to 1 to turn on, and zero to turn off. Default is off.");
67
68#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
69 do { \
70 if (iscsi_sw_tcp_dbg) \
71 iscsi_conn_printk(KERN_INFO, _conn, \
72 "%s " dbg_fmt, \
73 __func__, ##arg); \
74 } while (0);
75
76
Olaf Kirchda32dd62007-12-13 12:43:21 -060077/**
Mike Christie38e1a8f2008-12-02 00:32:12 -060078 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
79 * @rd_desc: read descriptor
80 * @skb: socket buffer
81 * @offset: offset in skb
82 * @len: skb->len - offset
Olaf Kirchda32dd62007-12-13 12:43:21 -060083 */
Mike Christie38e1a8f2008-12-02 00:32:12 -060084static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
85 unsigned int offset, size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -070086{
Mike Christie38e1a8f2008-12-02 00:32:12 -060087 struct iscsi_conn *conn = rd_desc->arg.data;
88 unsigned int consumed, total_consumed = 0;
89 int status;
90
Mike Christiec93f87c2009-03-05 14:46:00 -060091 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
Mike Christie38e1a8f2008-12-02 00:32:12 -060092
93 do {
94 status = 0;
95 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
96 offset += consumed;
97 total_consumed += consumed;
98 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
99
Mike Christiec93f87c2009-03-05 14:46:00 -0600100 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
101 skb->len - offset, status);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600102 return total_consumed;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600103}
Alex Aizman7ba24712005-08-04 19:30:08 -0700104
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500105/**
106 * iscsi_sw_sk_state_check - check socket state
107 * @sk: socket
108 *
109 * If the socket is in CLOSE or CLOSE_WAIT we should
110 * not close the connection if there is still some
111 * data pending.
Mike Christie03adb5f2011-06-24 15:11:54 -0500112 *
113 * Must be called with sk_callback_lock.
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500114 */
115static inline int iscsi_sw_sk_state_check(struct sock *sk)
116{
Mike Christie03adb5f2011-06-24 15:11:54 -0500117 struct iscsi_conn *conn = sk->sk_user_data;
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500118
Mike Christied1af8a32009-08-20 15:11:02 -0500119 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
Chris Leechc7124952013-09-26 09:09:44 -0700120 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
Mike Christied1af8a32009-08-20 15:11:02 -0500121 !atomic_read(&sk->sk_rmem_alloc)) {
122 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
123 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
124 return -ECONNRESET;
125 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500126 return 0;
127}
128
David S. Miller676d2362014-04-11 16:15:36 -0400129static void iscsi_sw_tcp_data_ready(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600130{
Mike Christie03adb5f2011-06-24 15:11:54 -0500131 struct iscsi_conn *conn;
132 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600133 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700134
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700135 read_lock_bh(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500136 conn = sk->sk_user_data;
137 if (!conn) {
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700138 read_unlock_bh(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500139 return;
140 }
141 tcp_conn = conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600142
143 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600144 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
145 * We set count to 1 because we want the network layer to
146 * hand us all the skbs that are available. iscsi_tcp_recv
147 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600148 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600149 rd_desc.arg.data = conn;
150 rd_desc.count = 1;
151 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600152
Mike Christied1af8a32009-08-20 15:11:02 -0500153 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500154
Mike Christie38e1a8f2008-12-02 00:32:12 -0600155 /* If we had to (atomically) map a highmem page,
156 * unmap it now. */
157 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700158 read_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600159}
Alex Aizman7ba24712005-08-04 19:30:08 -0700160
Mike Christie38e1a8f2008-12-02 00:32:12 -0600161static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600162{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600163 struct iscsi_tcp_conn *tcp_conn;
164 struct iscsi_sw_tcp_conn *tcp_sw_conn;
165 struct iscsi_conn *conn;
166 struct iscsi_session *session;
167 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600168
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700169 read_lock_bh(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500170 conn = sk->sk_user_data;
171 if (!conn) {
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700172 read_unlock_bh(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500173 return;
174 }
Mike Christie38e1a8f2008-12-02 00:32:12 -0600175 session = conn->session;
176
Mike Christied1af8a32009-08-20 15:11:02 -0500177 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700178
Mike Christie38e1a8f2008-12-02 00:32:12 -0600179 tcp_conn = conn->dd_data;
180 tcp_sw_conn = tcp_conn->dd_data;
181 old_state_change = tcp_sw_conn->old_state_change;
182
Eric Dumazet7cb001d2016-05-17 17:44:06 -0700183 read_unlock_bh(&sk->sk_callback_lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600184
185 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600186}
Alex Aizman7ba24712005-08-04 19:30:08 -0700187
Olaf Kirchda32dd62007-12-13 12:43:21 -0600188/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600189 * iscsi_write_space - Called when more output buffer space is available
190 * @sk: socket space is available for
191 **/
192static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600193{
Mike Christie03adb5f2011-06-24 15:11:54 -0500194 struct iscsi_conn *conn;
195 struct iscsi_tcp_conn *tcp_conn;
196 struct iscsi_sw_tcp_conn *tcp_sw_conn;
197 void (*old_write_space)(struct sock *);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600198
Mike Christie03adb5f2011-06-24 15:11:54 -0500199 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 tcp_conn = conn->dd_data;
207 tcp_sw_conn = tcp_conn->dd_data;
208 old_write_space = tcp_sw_conn->old_write_space;
209 read_unlock_bh(&sk->sk_callback_lock);
210
211 old_write_space(sk);
212
Mike Christiec93f87c2009-03-05 14:46:00 -0600213 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600214 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600215}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600216
Mike Christie38e1a8f2008-12-02 00:32:12 -0600217static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
218{
219 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
220 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
221 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600222
Mike Christie38e1a8f2008-12-02 00:32:12 -0600223 /* assign new callbacks */
224 write_lock_bh(&sk->sk_callback_lock);
225 sk->sk_user_data = conn;
226 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
227 tcp_sw_conn->old_state_change = sk->sk_state_change;
228 tcp_sw_conn->old_write_space = sk->sk_write_space;
229 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
230 sk->sk_state_change = iscsi_sw_tcp_state_change;
231 sk->sk_write_space = iscsi_sw_tcp_write_space;
232 write_unlock_bh(&sk->sk_callback_lock);
233}
Alex Aizman7ba24712005-08-04 19:30:08 -0700234
Mike Christie38e1a8f2008-12-02 00:32:12 -0600235static void
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500236iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600237{
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500238 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
239 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600240 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600241
Mike Christie38e1a8f2008-12-02 00:32:12 -0600242 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
243 write_lock_bh(&sk->sk_callback_lock);
244 sk->sk_user_data = NULL;
245 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
246 sk->sk_state_change = tcp_sw_conn->old_state_change;
247 sk->sk_write_space = tcp_sw_conn->old_write_space;
Tom Herbert28448b82014-05-23 08:47:19 -0700248 sk->sk_no_check_tx = 0;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600249 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600250}
251
252/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600253 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600254 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600255 * @segment: the buffer to transmnit
256 *
257 * This function transmits as much of the buffer as
258 * the network layer will accept, and returns the number of
259 * bytes transmitted.
260 *
261 * If CRC hashing is enabled, the function will compute the
262 * hash as it goes. When the entire segment has been transmitted,
263 * it will retrieve the hash value and send it as well.
264 */
Mike Christie6df19a72008-12-02 00:32:16 -0600265static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600266 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600267{
Mike Christie6df19a72008-12-02 00:32:16 -0600268 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600269 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600270 unsigned int copied = 0;
271 int r = 0;
272
Mike Christie6df19a72008-12-02 00:32:16 -0600273 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600274 struct scatterlist *sg;
275 unsigned int offset, copy;
276 int flags = 0;
277
278 r = 0;
279 offset = segment->copied;
280 copy = segment->size - offset;
281
282 if (segment->total_copied + segment->size < segment->total_size)
283 flags |= MSG_MORE;
284
285 /* Use sendpage if we can; else fall back to sendmsg */
286 if (!segment->data) {
287 sg = segment->sg;
288 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600289 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
290 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600291 } else {
292 struct msghdr msg = { .msg_flags = flags };
293 struct kvec iov = {
294 .iov_base = segment->data + offset,
295 .iov_len = copy
296 };
297
298 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
299 }
300
301 if (r < 0) {
302 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600303 return r;
304 }
305 copied += r;
306 }
307 return copied;
308}
309
310/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600311 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700312 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600313static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700314{
Mike Christie5bb0b552006-04-06 21:26:46 -0500315 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600316 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
317 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600318 unsigned int consumed = 0;
319 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700320
Olaf Kircha8ac6312007-12-13 12:43:35 -0600321 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600322 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500323 /*
324 * We may not have been able to send data because the conn
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300325 * is getting stopped. libiscsi will know so propagate err
Mike Christie32382492009-06-15 22:11:09 -0500326 * for it to do the right thing.
327 */
328 if (rc == -EAGAIN)
329 return rc;
330 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500331 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600332 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500333 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600334 break;
335
336 consumed += rc;
337
338 if (segment->total_copied >= segment->total_size) {
339 if (segment->done != NULL) {
340 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500341 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600342 goto error;
343 }
344 }
345 }
346
Mike Christiec93f87c2009-03-05 14:46:00 -0600347 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600348
349 conn->txdata_octets += consumed;
350 return consumed;
351
352error:
353 /* Transmit error. We could initiate error recovery
354 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600355 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500356 iscsi_conn_failure(conn, rc);
357 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600358}
359
360/**
361 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
362 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600363static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600364{
365 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600366 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
367 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600368
369 return segment->total_copied - segment->total_size;
370}
371
Mike Christie38e1a8f2008-12-02 00:32:12 -0600372static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600373{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600374 struct iscsi_conn *conn = task->conn;
Vlastimil Babkaf1083042017-05-08 15:59:53 -0700375 unsigned int noreclaim_flag;
Mike Christie9e45dd72013-04-10 11:24:39 -0500376 int rc = 0;
377
Vlastimil Babkaf1083042017-05-08 15:59:53 -0700378 noreclaim_flag = memalloc_noreclaim_save();
Olaf Kircha8ac6312007-12-13 12:43:35 -0600379
Mike Christie38e1a8f2008-12-02 00:32:12 -0600380 while (iscsi_sw_tcp_xmit_qlen(conn)) {
381 rc = iscsi_sw_tcp_xmit(conn);
Mike Christie9e45dd72013-04-10 11:24:39 -0500382 if (rc == 0) {
383 rc = -EAGAIN;
384 break;
385 }
Olaf Kircha8ac6312007-12-13 12:43:35 -0600386 if (rc < 0)
Mike Christie9e45dd72013-04-10 11:24:39 -0500387 break;
388 rc = 0;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600389 }
390
Vlastimil Babkaf1083042017-05-08 15:59:53 -0700391 memalloc_noreclaim_restore(noreclaim_flag);
Mike Christie9e45dd72013-04-10 11:24:39 -0500392 return rc;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600393}
394
395/*
396 * This is called when we're done sending the header.
397 * Simply copy the data_segment to the send segment, and return.
398 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600399static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
400 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600401{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600402 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
403
404 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600405 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
406 "Header done. Next segment size %u total_size %u\n",
407 tcp_sw_conn->out.segment.size,
408 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600409 return 0;
410}
411
Mike Christie38e1a8f2008-12-02 00:32:12 -0600412static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
413 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600414{
415 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600416 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600417
Mike Christiec93f87c2009-03-05 14:46:00 -0600418 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
419 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600420
421 /* Clear the data segment - needs to be filled in by the
422 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600423 memset(&tcp_sw_conn->out.data_segment, 0,
424 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600425
426 /* If header digest is enabled, compute the CRC and
427 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500428 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600429 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600430 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600431 if (conn->hdrdgst_en) {
Herbert Xu5d6ac292016-01-24 21:19:41 +0800432 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600433 hdr + hdrlen);
434 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500435 }
436
Olaf Kircha8ac6312007-12-13 12:43:35 -0600437 /* Remember header pointer for later, when we need
438 * to decide whether there's a payload to go along
439 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600440 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600441
Mike Christie38e1a8f2008-12-02 00:32:12 -0600442 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
443 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700444}
445
Olaf Kircha8ac6312007-12-13 12:43:35 -0600446/*
447 * Prepare the send buffer for the payload data.
448 * Padding and checksumming will all be taken care
449 * of by the iscsi_segment routines.
450 */
451static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600452iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
453 unsigned int count, unsigned int offset,
454 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700455{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600456 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600457 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Herbert Xu5d6ac292016-01-24 21:19:41 +0800458 struct ahash_request *tx_hash = NULL;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600459 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700460
Mike Christiec93f87c2009-03-05 14:46:00 -0600461 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
462 conn->datadgst_en ?
463 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700464
Olaf Kircha8ac6312007-12-13 12:43:35 -0600465 /* Make sure the datalen matches what the caller
466 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600467 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600468 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700469
Olaf Kircha8ac6312007-12-13 12:43:35 -0600470 if (conn->datadgst_en)
Herbert Xu5d6ac292016-01-24 21:19:41 +0800471 tx_hash = tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600472
Mike Christie38e1a8f2008-12-02 00:32:12 -0600473 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
474 sg, count, offset, len,
475 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700476}
477
Olaf Kircha8ac6312007-12-13 12:43:35 -0600478static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600479iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600480 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700481{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600482 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600483 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Herbert Xu5d6ac292016-01-24 21:19:41 +0800484 struct ahash_request *tx_hash = NULL;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600485 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700486
Mike Christiec93f87c2009-03-05 14:46:00 -0600487 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
488 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700489
Olaf Kircha8ac6312007-12-13 12:43:35 -0600490 /* Make sure the datalen matches what the caller
491 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600492 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600493 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700494
Olaf Kircha8ac6312007-12-13 12:43:35 -0600495 if (conn->datadgst_en)
Herbert Xu5d6ac292016-01-24 21:19:41 +0800496 tx_hash = tcp_sw_conn->tx_hash;
Alex Aizman7ba24712005-08-04 19:30:08 -0700497
Mike Christie38e1a8f2008-12-02 00:32:12 -0600498 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600499 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700500}
501
Mike Christie38e1a8f2008-12-02 00:32:12 -0600502static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
503 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600504{
505 struct iscsi_conn *conn = task->conn;
506 int err = 0;
507
Mike Christie38e1a8f2008-12-02 00:32:12 -0600508 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600509
510 if (!count)
511 return 0;
512
513 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600514 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600515 else {
516 struct scsi_data_buffer *sdb = scsi_out(task->sc);
517
Mike Christie38e1a8f2008-12-02 00:32:12 -0600518 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
519 sdb->table.nents, offset,
520 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600521 }
522
523 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500524 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600525 return -EIO;
526 }
527 return 0;
528}
529
Mike Christie2ff79d52008-12-02 00:32:14 -0600530static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600531{
532 struct iscsi_tcp_task *tcp_task = task->dd_data;
533
Mike Christie38e1a8f2008-12-02 00:32:12 -0600534 task->hdr = task->dd_data + sizeof(*tcp_task);
535 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600536 return 0;
537}
538
Mike Christie7b8631b2006-01-13 18:05:50 -0600539static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600540iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
541 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700542{
Mike Christie7b8631b2006-01-13 18:05:50 -0600543 struct iscsi_conn *conn;
544 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500545 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600546 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Herbert Xu5d6ac292016-01-24 21:19:41 +0800547 struct crypto_ahash *tfm;
Alex Aizman7ba24712005-08-04 19:30:08 -0700548
Mike Christie38e1a8f2008-12-02 00:32:12 -0600549 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
550 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600551 if (!cls_conn)
552 return NULL;
553 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500554 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600555 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700556
Herbert Xu5d6ac292016-01-24 21:19:41 +0800557 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
558 if (IS_ERR(tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500559 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400560
Herbert Xu5d6ac292016-01-24 21:19:41 +0800561 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
562 if (!tcp_sw_conn->tx_hash)
563 goto free_tfm;
564 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
565
566 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
567 if (!tcp_sw_conn->rx_hash)
568 goto free_tx_hash;
569 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
570
571 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400572
Mike Christie7b8631b2006-01-13 18:05:50 -0600573 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700574
Herbert Xu5d6ac292016-01-24 21:19:41 +0800575free_tx_hash:
576 ahash_request_free(tcp_sw_conn->tx_hash);
577free_tfm:
578 crypto_free_ahash(tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500579free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600580 iscsi_conn_printk(KERN_ERR, conn,
581 "Could not create connection due to crc32c "
582 "loading error. Make sure the crc32c "
583 "module is built as a module or into the "
584 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600585 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600586 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700587}
588
Mike Christie38e1a8f2008-12-02 00:32:12 -0600589static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500590{
Mike Christie22236962007-05-30 12:57:24 -0500591 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500592 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600593 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
594 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500595
Mike Christie22236962007-05-30 12:57:24 -0500596 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500597 return;
598
Mike Christie22236962007-05-30 12:57:24 -0500599 sock_hold(sock->sk);
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500600 iscsi_sw_tcp_conn_restore_callbacks(conn);
Mike Christie22236962007-05-30 12:57:24 -0500601 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500602
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600603 spin_lock_bh(&session->frwd_lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600604 tcp_sw_conn->sock = NULL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600605 spin_unlock_bh(&session->frwd_lock);
Mike Christie22236962007-05-30 12:57:24 -0500606 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500607}
608
Mike Christie38e1a8f2008-12-02 00:32:12 -0600609static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700610{
Mike Christie7b8631b2006-01-13 18:05:50 -0600611 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500612 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600613 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700614
Mike Christie38e1a8f2008-12-02 00:32:12 -0600615 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700616
Herbert Xu5d6ac292016-01-24 21:19:41 +0800617 ahash_request_free(tcp_sw_conn->rx_hash);
618 if (tcp_sw_conn->tx_hash) {
619 struct crypto_ahash *tfm;
620
621 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
622 ahash_request_free(tcp_sw_conn->tx_hash);
623 crypto_free_ahash(tfm);
624 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700625
Mike Christie38e1a8f2008-12-02 00:32:12 -0600626 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700627}
628
Mike Christie38e1a8f2008-12-02 00:32:12 -0600629static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500630{
631 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500632 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600633 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christieb64e77f2010-02-10 16:51:47 -0600634 struct socket *sock = tcp_sw_conn->sock;
Mike Christie913e5bf2008-05-21 15:54:18 -0500635
636 /* userspace may have goofed up and not bound us */
Mike Christieb64e77f2010-02-10 16:51:47 -0600637 if (!sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500638 return;
Mike Christie1c834692006-07-24 15:47:26 -0500639
Mike Christie8c38a292010-05-21 18:24:16 -0500640 sock->sk->sk_err = EIO;
641 wake_up_interruptible(sk_sleep(sock->sk));
Mike Christieb64e77f2010-02-10 16:51:47 -0600642
Mike Christie03adb5f2011-06-24 15:11:54 -0500643 /* stop xmit side */
644 iscsi_suspend_tx(conn);
645
646 /* stop recv side and release socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600647 iscsi_sw_tcp_release_conn(conn);
Mike Christie03adb5f2011-06-24 15:11:54 -0500648
649 iscsi_conn_stop(cls_conn, flag);
Mike Christie1c834692006-07-24 15:47:26 -0500650}
651
Alex Aizman7ba24712005-08-04 19:30:08 -0700652static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600653iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
654 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
655 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700656{
Mike Christiea79af8a2011-02-16 15:04:36 -0600657 struct iscsi_session *session = cls_session->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500658 struct iscsi_conn *conn = cls_conn->dd_data;
659 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600660 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700661 struct sock *sk;
662 struct socket *sock;
663 int err;
664
665 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500666 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700667 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600668 iscsi_conn_printk(KERN_ERR, conn,
669 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700670 return -EEXIST;
671 }
672
Mike Christie5bb0b552006-04-06 21:26:46 -0500673 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
674 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500675 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700676
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600677 spin_lock_bh(&session->frwd_lock);
Mike Christie67a61112006-05-30 00:37:20 -0500678 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600679 tcp_sw_conn->sock = sock;
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600680 spin_unlock_bh(&session->frwd_lock);
Alex Aizman7ba24712005-08-04 19:30:08 -0700681
Mike Christie67a61112006-05-30 00:37:20 -0500682 /* setup Socket parameters */
683 sk = sock->sk;
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +0000684 sk->sk_reuse = SK_CAN_REUSE;
Mike Christie67a61112006-05-30 00:37:20 -0500685 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
686 sk->sk_allocation = GFP_ATOMIC;
Mike Christie9e45dd72013-04-10 11:24:39 -0500687 sk_set_memalloc(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700688
Mike Christie38e1a8f2008-12-02 00:32:12 -0600689 iscsi_sw_tcp_conn_set_callbacks(conn);
690 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500691 /*
692 * set receive state machine into initial state
693 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600694 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700695 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500696
697free_socket:
698 sockfd_put(sock);
699 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700700}
701
Mike Christie38e1a8f2008-12-02 00:32:12 -0600702static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
703 enum iscsi_param param, char *buf,
704 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700705{
Mike Christie7b7232f2006-02-01 21:06:49 -0600706 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500707 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600708 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700709
Alex Aizman7ba24712005-08-04 19:30:08 -0700710 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700711 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500712 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700713 break;
714 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500715 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600716 tcp_sw_conn->sendpage = conn->datadgst_en ?
717 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700718 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700719 case ISCSI_PARAM_MAX_R2T:
Mike Christie1304be52012-01-26 21:13:10 -0600720 return iscsi_tcp_set_max_r2t(conn, buf);
Alex Aizman7ba24712005-08-04 19:30:08 -0700721 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500722 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700723 }
724
725 return 0;
726}
727
Mike Christie38e1a8f2008-12-02 00:32:12 -0600728static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
729 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600730{
Mike Christie7b7232f2006-02-01 21:06:49 -0600731 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600732 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
733 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
734 struct sockaddr_in6 addr;
735 int rc, len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600736
737 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500738 case ISCSI_PARAM_CONN_PORT:
Mike Christiefd7255f2006-04-06 21:13:36 -0500739 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie4bfb8ebf2014-09-29 13:55:42 -0500740 case ISCSI_PARAM_LOCAL_PORT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600741 spin_lock_bh(&conn->session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600742 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600743 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600744 return -ENOTCONN;
745 }
Mike Christie4bfb8ebf2014-09-29 13:55:42 -0500746 if (param == ISCSI_PARAM_LOCAL_PORT)
747 rc = kernel_getsockname(tcp_sw_conn->sock,
748 (struct sockaddr *)&addr, &len);
749 else
750 rc = kernel_getpeername(tcp_sw_conn->sock,
751 (struct sockaddr *)&addr, &len);
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600752 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600753 if (rc)
754 return rc;
755
756 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
757 &addr, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500758 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500759 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500760 }
761
Mike Christiea79af8a2011-02-16 15:04:36 -0600762 return 0;
763}
764
765static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
766 enum iscsi_host_param param, char *buf)
767{
768 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
769 struct iscsi_session *session = tcp_sw_host->session;
770 struct iscsi_conn *conn;
771 struct iscsi_tcp_conn *tcp_conn;
772 struct iscsi_sw_tcp_conn *tcp_sw_conn;
773 struct sockaddr_in6 addr;
774 int rc, len;
775
776 switch (param) {
777 case ISCSI_HOST_PARAM_IPADDRESS:
Mike Christieeee2b5c2014-02-07 00:41:42 -0600778 if (!session)
779 return -ENOTCONN;
780
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600781 spin_lock_bh(&session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600782 conn = session->leadconn;
783 if (!conn) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600784 spin_unlock_bh(&session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600785 return -ENOTCONN;
786 }
787 tcp_conn = conn->dd_data;
788
789 tcp_sw_conn = tcp_conn->dd_data;
790 if (!tcp_sw_conn->sock) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600791 spin_unlock_bh(&session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600792 return -ENOTCONN;
793 }
794
795 rc = kernel_getsockname(tcp_sw_conn->sock,
796 (struct sockaddr *)&addr, &len);
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600797 spin_unlock_bh(&session->frwd_lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600798 if (rc)
799 return rc;
800
801 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
802 &addr, param, buf);
803 default:
804 return iscsi_host_get_param(shost, param, buf);
805 }
806
807 return 0;
Mike Christiefd7255f2006-04-06 21:13:36 -0500808}
809
Alex Aizman7ba24712005-08-04 19:30:08 -0700810static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600811iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
812 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700813{
Mike Christie7b7232f2006-02-01 21:06:49 -0600814 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500815 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600816 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700817
Alex Aizman7ba24712005-08-04 19:30:08 -0700818 stats->custom_length = 3;
819 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600820 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700821 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600822 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700823 strcpy(stats->custom[2].desc, "eh_abort_cnt");
824 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600825
826 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700827}
828
Mike Christie5bb0b552006-04-06 21:26:46 -0500829static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600830iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600831 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700832{
Mike Christie5bb0b552006-04-06 21:26:46 -0500833 struct iscsi_cls_session *cls_session;
834 struct iscsi_session *session;
Mike Christiea79af8a2011-02-16 15:04:36 -0600835 struct iscsi_sw_tcp_host *tcp_sw_host;
Mike Christie06520ede2008-05-21 15:54:15 -0500836 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700837
Mike Christie06520ede2008-05-21 15:54:15 -0500838 if (ep) {
839 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500840 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500841 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700842
Mike Christiea79af8a2011-02-16 15:04:36 -0600843 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
844 sizeof(struct iscsi_sw_tcp_host), 1);
Mike Christie75613522008-05-21 15:53:59 -0500845 if (!shost)
846 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600847 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600848 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500849 shost->max_lun = iscsi_max_lun;
850 shost->max_id = 0;
851 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300852 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500853
Mike Christiea4804cd2008-05-21 15:54:00 -0500854 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500855 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500856
Mike Christie38e1a8f2008-12-02 00:32:12 -0600857 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530858 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600859 sizeof(struct iscsi_tcp_task) +
860 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500861 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500862 if (!cls_session)
863 goto remove_host;
864 session = cls_session->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600865 tcp_sw_host = iscsi_host_priv(shost);
866 tcp_sw_host->session = session;
Mike Christie75613522008-05-21 15:53:59 -0500867
Mike Christiefbc514b2008-05-21 15:54:07 -0500868 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600869 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500870 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500871 return cls_session;
872
Mike Christie75613522008-05-21 15:53:59 -0500873remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500874 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500875remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500876 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500877free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500878 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500879 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700880}
881
Mike Christie38e1a8f2008-12-02 00:32:12 -0600882static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500883{
Mike Christie75613522008-05-21 15:53:59 -0500884 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
885
Mike Christie38e1a8f2008-12-02 00:32:12 -0600886 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500887 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500888
Mike Christiea4804cd2008-05-21 15:54:00 -0500889 iscsi_host_remove(shost);
890 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500891}
892
Al Viro587a1f12011-07-23 23:11:19 -0400893static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
Mike Christie3128c6c2011-07-25 13:48:42 -0500894{
895 switch (param_type) {
Mike Christief27fb2e2011-07-25 13:48:45 -0500896 case ISCSI_HOST_PARAM:
897 switch (param) {
898 case ISCSI_HOST_PARAM_NETDEV_NAME:
899 case ISCSI_HOST_PARAM_HWADDRESS:
900 case ISCSI_HOST_PARAM_IPADDRESS:
901 case ISCSI_HOST_PARAM_INITIATOR_NAME:
902 return S_IRUGO;
903 default:
904 return 0;
905 }
Mike Christie3128c6c2011-07-25 13:48:42 -0500906 case ISCSI_PARAM:
907 switch (param) {
908 case ISCSI_PARAM_MAX_RECV_DLENGTH:
909 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
910 case ISCSI_PARAM_HDRDGST_EN:
911 case ISCSI_PARAM_DATADGST_EN:
912 case ISCSI_PARAM_CONN_ADDRESS:
913 case ISCSI_PARAM_CONN_PORT:
Mike Christie4bfb8ebf2014-09-29 13:55:42 -0500914 case ISCSI_PARAM_LOCAL_PORT:
Mike Christie3128c6c2011-07-25 13:48:42 -0500915 case ISCSI_PARAM_EXP_STATSN:
916 case ISCSI_PARAM_PERSISTENT_ADDRESS:
917 case ISCSI_PARAM_PERSISTENT_PORT:
918 case ISCSI_PARAM_PING_TMO:
919 case ISCSI_PARAM_RECV_TMO:
Mike Christie1d063c12011-07-25 13:48:43 -0500920 case ISCSI_PARAM_INITIAL_R2T_EN:
921 case ISCSI_PARAM_MAX_R2T:
922 case ISCSI_PARAM_IMM_DATA_EN:
923 case ISCSI_PARAM_FIRST_BURST:
924 case ISCSI_PARAM_MAX_BURST:
925 case ISCSI_PARAM_PDU_INORDER_EN:
926 case ISCSI_PARAM_DATASEQ_INORDER_EN:
927 case ISCSI_PARAM_ERL:
928 case ISCSI_PARAM_TARGET_NAME:
929 case ISCSI_PARAM_TPGT:
930 case ISCSI_PARAM_USERNAME:
931 case ISCSI_PARAM_PASSWORD:
932 case ISCSI_PARAM_USERNAME_IN:
933 case ISCSI_PARAM_PASSWORD_IN:
934 case ISCSI_PARAM_FAST_ABORT:
935 case ISCSI_PARAM_ABORT_TMO:
936 case ISCSI_PARAM_LU_RESET_TMO:
937 case ISCSI_PARAM_TGT_RESET_TMO:
938 case ISCSI_PARAM_IFACE_NAME:
939 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie3128c6c2011-07-25 13:48:42 -0500940 return S_IRUGO;
941 default:
942 return 0;
943 }
944 }
945
946 return 0;
947}
948
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600949static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
950{
951 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
952 return 0;
953}
954
Mike Christie38e1a8f2008-12-02 00:32:12 -0600955static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500956{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500957 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500958 blk_queue_dma_alignment(sdev->request_queue, 0);
959 return 0;
960}
961
Mike Christie38e1a8f2008-12-02 00:32:12 -0600962static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500963 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500964 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500965 .queuecommand = iscsi_queuecommand,
Christoph Hellwigdb5ed4d2014-11-13 15:08:42 +0100966 .change_queue_depth = scsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500967 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600968 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600969 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500970 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
Christoph Hellwigb6a05c82017-01-30 13:18:58 +0100971 .eh_timed_out = iscsi_eh_cmd_timed_out,
Mike Christie5bb0b552006-04-06 21:26:46 -0500972 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600973 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530974 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie5bb0b552006-04-06 21:26:46 -0500975 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600976 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600977 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500978 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500979 .proc_name = "iscsi_tcp",
980 .this_id = -1,
Christoph Hellwigc40ecc12014-11-13 14:25:11 +0100981 .track_queue_depth = 1,
Mike Christie5bb0b552006-04-06 21:26:46 -0500982};
983
Mike Christie38e1a8f2008-12-02 00:32:12 -0600984static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700985 .owner = THIS_MODULE,
986 .name = "tcp",
987 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
988 | CAP_DATADGST,
Mike Christie5bb0b552006-04-06 21:26:46 -0500989 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600990 .create_session = iscsi_sw_tcp_session_create,
991 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500992 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600993 .create_conn = iscsi_sw_tcp_conn_create,
994 .bind_conn = iscsi_sw_tcp_conn_bind,
995 .destroy_conn = iscsi_sw_tcp_conn_destroy,
Mike Christie3128c6c2011-07-25 13:48:42 -0500996 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600997 .set_param = iscsi_sw_tcp_conn_set_param,
998 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600999 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -07001000 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -06001001 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -05001002 /* iscsi host params */
Mike Christiea79af8a2011-02-16 15:04:36 -06001003 .get_host_param = iscsi_sw_tcp_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -05001004 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -05001005 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -07001006 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -06001007 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -06001008 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -05001009 .init_task = iscsi_tcp_task_init,
1010 .xmit_task = iscsi_tcp_task_xmit,
1011 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -06001012 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -06001013 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1014 .init_pdu = iscsi_sw_tcp_pdu_init,
1015 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -05001016 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -05001017 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -07001018};
1019
Mike Christie38e1a8f2008-12-02 00:32:12 -06001020static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -07001021{
Alex Aizman7ba24712005-08-04 19:30:08 -07001022 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -05001023 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1024 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -07001025 return -EINVAL;
1026 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001027
Mike Christie38e1a8f2008-12-02 00:32:12 -06001028 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1029 &iscsi_sw_tcp_transport);
1030 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -05001031 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -07001032
Mike Christie7b8631b2006-01-13 18:05:50 -06001033 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001034}
1035
Mike Christie38e1a8f2008-12-02 00:32:12 -06001036static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -07001037{
Mike Christie38e1a8f2008-12-02 00:32:12 -06001038 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -07001039}
1040
Mike Christie38e1a8f2008-12-02 00:32:12 -06001041module_init(iscsi_sw_tcp_init);
1042module_exit(iscsi_sw_tcp_exit);