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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
29#include <linux/types.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070030#include <linux/inet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Mike Christie4e7aba72007-05-30 12:57:23 -050032#include <linux/file.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070033#include <linux/blkdev.h>
34#include <linux/crypto.h>
35#include <linux/delay.h>
36#include <linux/kfifo.h>
37#include <linux/scatterlist.h>
Paul Gortmakeracf3368f2011-05-27 09:47:43 -040038#include <linux/module.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070039#include <net/tcp.h>
40#include <scsi/scsi_cmnd.h>
Mike Christied1d81c02007-05-30 12:57:21 -050041#include <scsi/scsi_device.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070042#include <scsi/scsi_host.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_transport_iscsi.h>
45
46#include "iscsi_tcp.h"
47
Mike Christie38e1a8f2008-12-02 00:32:12 -060048MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
49 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
Alex Aizman7ba24712005-08-04 19:30:08 -070050 "Alex Aizman <itn780@yahoo.com>");
51MODULE_DESCRIPTION("iSCSI/TCP data-path");
52MODULE_LICENSE("GPL");
Alex Aizman7ba24712005-08-04 19:30:08 -070053
Mike Christie38e1a8f2008-12-02 00:32:12 -060054static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
55static struct scsi_host_template iscsi_sw_tcp_sht;
56static struct iscsi_transport iscsi_sw_tcp_transport;
Mike Christie75613522008-05-21 15:53:59 -050057
Rob Eversc0e4eaa2012-08-15 18:39:34 -040058static unsigned int iscsi_max_lun = ~0;
Alex Aizman7ba24712005-08-04 19:30:08 -070059module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
60
Mike Christiec93f87c2009-03-05 14:46:00 -060061static int iscsi_sw_tcp_dbg;
62module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
63 S_IRUGO | S_IWUSR);
64MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
65 "Set to 1 to turn on, and zero to turn off. Default is off.");
66
67#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
68 do { \
69 if (iscsi_sw_tcp_dbg) \
70 iscsi_conn_printk(KERN_INFO, _conn, \
71 "%s " dbg_fmt, \
72 __func__, ##arg); \
73 } while (0);
74
75
Olaf Kirchda32dd62007-12-13 12:43:21 -060076/**
Mike Christie38e1a8f2008-12-02 00:32:12 -060077 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
78 * @rd_desc: read descriptor
79 * @skb: socket buffer
80 * @offset: offset in skb
81 * @len: skb->len - offset
Olaf Kirchda32dd62007-12-13 12:43:21 -060082 */
Mike Christie38e1a8f2008-12-02 00:32:12 -060083static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
84 unsigned int offset, size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -070085{
Mike Christie38e1a8f2008-12-02 00:32:12 -060086 struct iscsi_conn *conn = rd_desc->arg.data;
87 unsigned int consumed, total_consumed = 0;
88 int status;
89
Mike Christiec93f87c2009-03-05 14:46:00 -060090 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
Mike Christie38e1a8f2008-12-02 00:32:12 -060091
92 do {
93 status = 0;
94 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
95 offset += consumed;
96 total_consumed += consumed;
97 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
98
Mike Christiec93f87c2009-03-05 14:46:00 -060099 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
100 skb->len - offset, status);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600101 return total_consumed;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600102}
Alex Aizman7ba24712005-08-04 19:30:08 -0700103
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500104/**
105 * iscsi_sw_sk_state_check - check socket state
106 * @sk: socket
107 *
108 * If the socket is in CLOSE or CLOSE_WAIT we should
109 * not close the connection if there is still some
110 * data pending.
Mike Christie03adb5f2011-06-24 15:11:54 -0500111 *
112 * Must be called with sk_callback_lock.
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500113 */
114static inline int iscsi_sw_sk_state_check(struct sock *sk)
115{
Mike Christie03adb5f2011-06-24 15:11:54 -0500116 struct iscsi_conn *conn = sk->sk_user_data;
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500117
Mike Christied1af8a32009-08-20 15:11:02 -0500118 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
Chris Leechc7124952013-09-26 09:09:44 -0700119 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
Mike Christied1af8a32009-08-20 15:11:02 -0500120 !atomic_read(&sk->sk_rmem_alloc)) {
121 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
122 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
123 return -ECONNRESET;
124 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500125 return 0;
126}
127
Mike Christie38e1a8f2008-12-02 00:32:12 -0600128static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600129{
Mike Christie03adb5f2011-06-24 15:11:54 -0500130 struct iscsi_conn *conn;
131 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600132 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700133
Mike Christie38e1a8f2008-12-02 00:32:12 -0600134 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500135 conn = sk->sk_user_data;
136 if (!conn) {
137 read_unlock(&sk->sk_callback_lock);
138 return;
139 }
140 tcp_conn = conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600141
142 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600143 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
144 * We set count to 1 because we want the network layer to
145 * hand us all the skbs that are available. iscsi_tcp_recv
146 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600147 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600148 rd_desc.arg.data = conn;
149 rd_desc.count = 1;
150 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600151
Mike Christied1af8a32009-08-20 15:11:02 -0500152 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500153
Mike Christie38e1a8f2008-12-02 00:32:12 -0600154 /* If we had to (atomically) map a highmem page,
155 * unmap it now. */
156 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Mike Christie03adb5f2011-06-24 15:11:54 -0500157 read_unlock(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600158}
Alex Aizman7ba24712005-08-04 19:30:08 -0700159
Mike Christie38e1a8f2008-12-02 00:32:12 -0600160static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600161{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600162 struct iscsi_tcp_conn *tcp_conn;
163 struct iscsi_sw_tcp_conn *tcp_sw_conn;
164 struct iscsi_conn *conn;
165 struct iscsi_session *session;
166 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600167
Mike Christie38e1a8f2008-12-02 00:32:12 -0600168 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500169 conn = sk->sk_user_data;
170 if (!conn) {
171 read_unlock(&sk->sk_callback_lock);
172 return;
173 }
Mike Christie38e1a8f2008-12-02 00:32:12 -0600174 session = conn->session;
175
Mike Christied1af8a32009-08-20 15:11:02 -0500176 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700177
Mike Christie38e1a8f2008-12-02 00:32:12 -0600178 tcp_conn = conn->dd_data;
179 tcp_sw_conn = tcp_conn->dd_data;
180 old_state_change = tcp_sw_conn->old_state_change;
181
182 read_unlock(&sk->sk_callback_lock);
183
184 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600185}
Alex Aizman7ba24712005-08-04 19:30:08 -0700186
Olaf Kirchda32dd62007-12-13 12:43:21 -0600187/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600188 * iscsi_write_space - Called when more output buffer space is available
189 * @sk: socket space is available for
190 **/
191static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600192{
Mike Christie03adb5f2011-06-24 15:11:54 -0500193 struct iscsi_conn *conn;
194 struct iscsi_tcp_conn *tcp_conn;
195 struct iscsi_sw_tcp_conn *tcp_sw_conn;
196 void (*old_write_space)(struct sock *);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600197
Mike Christie03adb5f2011-06-24 15:11:54 -0500198 read_lock_bh(&sk->sk_callback_lock);
199 conn = sk->sk_user_data;
200 if (!conn) {
201 read_unlock_bh(&sk->sk_callback_lock);
202 return;
203 }
204
205 tcp_conn = conn->dd_data;
206 tcp_sw_conn = tcp_conn->dd_data;
207 old_write_space = tcp_sw_conn->old_write_space;
208 read_unlock_bh(&sk->sk_callback_lock);
209
210 old_write_space(sk);
211
Mike Christiec93f87c2009-03-05 14:46:00 -0600212 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600213 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600214}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600215
Mike Christie38e1a8f2008-12-02 00:32:12 -0600216static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
217{
218 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
219 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
220 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600221
Mike Christie38e1a8f2008-12-02 00:32:12 -0600222 /* assign new callbacks */
223 write_lock_bh(&sk->sk_callback_lock);
224 sk->sk_user_data = conn;
225 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
226 tcp_sw_conn->old_state_change = sk->sk_state_change;
227 tcp_sw_conn->old_write_space = sk->sk_write_space;
228 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
229 sk->sk_state_change = iscsi_sw_tcp_state_change;
230 sk->sk_write_space = iscsi_sw_tcp_write_space;
231 write_unlock_bh(&sk->sk_callback_lock);
232}
Alex Aizman7ba24712005-08-04 19:30:08 -0700233
Mike Christie38e1a8f2008-12-02 00:32:12 -0600234static void
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500235iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600236{
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500237 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
238 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600239 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600240
Mike Christie38e1a8f2008-12-02 00:32:12 -0600241 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
242 write_lock_bh(&sk->sk_callback_lock);
243 sk->sk_user_data = NULL;
244 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
245 sk->sk_state_change = tcp_sw_conn->old_state_change;
246 sk->sk_write_space = tcp_sw_conn->old_write_space;
247 sk->sk_no_check = 0;
248 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600249}
250
251/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600252 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600253 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600254 * @segment: the buffer to transmnit
255 *
256 * This function transmits as much of the buffer as
257 * the network layer will accept, and returns the number of
258 * bytes transmitted.
259 *
260 * If CRC hashing is enabled, the function will compute the
261 * hash as it goes. When the entire segment has been transmitted,
262 * it will retrieve the hash value and send it as well.
263 */
Mike Christie6df19a72008-12-02 00:32:16 -0600264static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600265 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600266{
Mike Christie6df19a72008-12-02 00:32:16 -0600267 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600268 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600269 unsigned int copied = 0;
270 int r = 0;
271
Mike Christie6df19a72008-12-02 00:32:16 -0600272 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600273 struct scatterlist *sg;
274 unsigned int offset, copy;
275 int flags = 0;
276
277 r = 0;
278 offset = segment->copied;
279 copy = segment->size - offset;
280
281 if (segment->total_copied + segment->size < segment->total_size)
282 flags |= MSG_MORE;
283
284 /* Use sendpage if we can; else fall back to sendmsg */
285 if (!segment->data) {
286 sg = segment->sg;
287 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600288 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
289 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600290 } else {
291 struct msghdr msg = { .msg_flags = flags };
292 struct kvec iov = {
293 .iov_base = segment->data + offset,
294 .iov_len = copy
295 };
296
297 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
298 }
299
300 if (r < 0) {
301 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600302 return r;
303 }
304 copied += r;
305 }
306 return copied;
307}
308
309/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600310 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700311 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600312static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700313{
Mike Christie5bb0b552006-04-06 21:26:46 -0500314 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600315 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
316 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600317 unsigned int consumed = 0;
318 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700319
Olaf Kircha8ac6312007-12-13 12:43:35 -0600320 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600321 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500322 /*
323 * We may not have been able to send data because the conn
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300324 * is getting stopped. libiscsi will know so propagate err
Mike Christie32382492009-06-15 22:11:09 -0500325 * for it to do the right thing.
326 */
327 if (rc == -EAGAIN)
328 return rc;
329 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500330 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600331 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500332 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600333 break;
334
335 consumed += rc;
336
337 if (segment->total_copied >= segment->total_size) {
338 if (segment->done != NULL) {
339 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500340 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600341 goto error;
342 }
343 }
344 }
345
Mike Christiec93f87c2009-03-05 14:46:00 -0600346 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600347
348 conn->txdata_octets += consumed;
349 return consumed;
350
351error:
352 /* Transmit error. We could initiate error recovery
353 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600354 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500355 iscsi_conn_failure(conn, rc);
356 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600357}
358
359/**
360 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
361 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600362static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600363{
364 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600365 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
366 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600367
368 return segment->total_copied - segment->total_size;
369}
370
Mike Christie38e1a8f2008-12-02 00:32:12 -0600371static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600372{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600373 struct iscsi_conn *conn = task->conn;
Mike Christie9e45dd72013-04-10 11:24:39 -0500374 unsigned long pflags = current->flags;
375 int rc = 0;
376
377 current->flags |= PF_MEMALLOC;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600378
Mike Christie38e1a8f2008-12-02 00:32:12 -0600379 while (iscsi_sw_tcp_xmit_qlen(conn)) {
380 rc = iscsi_sw_tcp_xmit(conn);
Mike Christie9e45dd72013-04-10 11:24:39 -0500381 if (rc == 0) {
382 rc = -EAGAIN;
383 break;
384 }
Olaf Kircha8ac6312007-12-13 12:43:35 -0600385 if (rc < 0)
Mike Christie9e45dd72013-04-10 11:24:39 -0500386 break;
387 rc = 0;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600388 }
389
Mike Christie9e45dd72013-04-10 11:24:39 -0500390 tsk_restore_flags(current, pflags, PF_MEMALLOC);
391 return rc;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600392}
393
394/*
395 * This is called when we're done sending the header.
396 * Simply copy the data_segment to the send segment, and return.
397 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600398static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
399 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600400{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600401 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
402
403 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600404 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
405 "Header done. Next segment size %u total_size %u\n",
406 tcp_sw_conn->out.segment.size,
407 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600408 return 0;
409}
410
Mike Christie38e1a8f2008-12-02 00:32:12 -0600411static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
412 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600413{
414 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600415 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600416
Mike Christiec93f87c2009-03-05 14:46:00 -0600417 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
418 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600419
420 /* Clear the data segment - needs to be filled in by the
421 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600422 memset(&tcp_sw_conn->out.data_segment, 0,
423 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600424
425 /* If header digest is enabled, compute the CRC and
426 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500427 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600428 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600429 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600430 if (conn->hdrdgst_en) {
Mike Christie38e1a8f2008-12-02 00:32:12 -0600431 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600432 hdr + hdrlen);
433 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500434 }
435
Olaf Kircha8ac6312007-12-13 12:43:35 -0600436 /* Remember header pointer for later, when we need
437 * to decide whether there's a payload to go along
438 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600439 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600440
Mike Christie38e1a8f2008-12-02 00:32:12 -0600441 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
442 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700443}
444
Olaf Kircha8ac6312007-12-13 12:43:35 -0600445/*
446 * Prepare the send buffer for the payload data.
447 * Padding and checksumming will all be taken care
448 * of by the iscsi_segment routines.
449 */
450static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600451iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
452 unsigned int count, unsigned int offset,
453 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700454{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600455 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600456 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600457 struct hash_desc *tx_hash = NULL;
458 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700459
Mike Christiec93f87c2009-03-05 14:46:00 -0600460 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
461 conn->datadgst_en ?
462 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700463
Olaf Kircha8ac6312007-12-13 12:43:35 -0600464 /* Make sure the datalen matches what the caller
465 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600466 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600467 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700468
Olaf Kircha8ac6312007-12-13 12:43:35 -0600469 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600470 tx_hash = &tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600471
Mike Christie38e1a8f2008-12-02 00:32:12 -0600472 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
473 sg, count, offset, len,
474 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700475}
476
Olaf Kircha8ac6312007-12-13 12:43:35 -0600477static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600478iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600479 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700480{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600481 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600482 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600483 struct hash_desc *tx_hash = NULL;
484 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700485
Mike Christiec93f87c2009-03-05 14:46:00 -0600486 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
487 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700488
Olaf Kircha8ac6312007-12-13 12:43:35 -0600489 /* Make sure the datalen matches what the caller
490 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600491 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600492 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700493
Olaf Kircha8ac6312007-12-13 12:43:35 -0600494 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600495 tx_hash = &tcp_sw_conn->tx_hash;
Alex Aizman7ba24712005-08-04 19:30:08 -0700496
Mike Christie38e1a8f2008-12-02 00:32:12 -0600497 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600498 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700499}
500
Mike Christie38e1a8f2008-12-02 00:32:12 -0600501static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
502 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600503{
504 struct iscsi_conn *conn = task->conn;
505 int err = 0;
506
Mike Christie38e1a8f2008-12-02 00:32:12 -0600507 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600508
509 if (!count)
510 return 0;
511
512 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600513 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600514 else {
515 struct scsi_data_buffer *sdb = scsi_out(task->sc);
516
Mike Christie38e1a8f2008-12-02 00:32:12 -0600517 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
518 sdb->table.nents, offset,
519 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600520 }
521
522 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500523 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600524 return -EIO;
525 }
526 return 0;
527}
528
Mike Christie2ff79d52008-12-02 00:32:14 -0600529static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600530{
531 struct iscsi_tcp_task *tcp_task = task->dd_data;
532
Mike Christie38e1a8f2008-12-02 00:32:12 -0600533 task->hdr = task->dd_data + sizeof(*tcp_task);
534 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600535 return 0;
536}
537
Mike Christie7b8631b2006-01-13 18:05:50 -0600538static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600539iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
540 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700541{
Mike Christie7b8631b2006-01-13 18:05:50 -0600542 struct iscsi_conn *conn;
543 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500544 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600545 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700546
Mike Christie38e1a8f2008-12-02 00:32:12 -0600547 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
548 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600549 if (!cls_conn)
550 return NULL;
551 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500552 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600553 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700554
Mike Christie38e1a8f2008-12-02 00:32:12 -0600555 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
556 CRYPTO_ALG_ASYNC);
557 tcp_sw_conn->tx_hash.flags = 0;
558 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500559 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400560
Mike Christie38e1a8f2008-12-02 00:32:12 -0600561 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
562 CRYPTO_ALG_ASYNC);
563 tcp_sw_conn->rx_hash.flags = 0;
564 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
Mike Christiedd8c0d92006-08-31 18:09:28 -0400565 goto free_tx_tfm;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600566 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400567
Mike Christie7b8631b2006-01-13 18:05:50 -0600568 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700569
Mike Christiedd8c0d92006-08-31 18:09:28 -0400570free_tx_tfm:
Mike Christie38e1a8f2008-12-02 00:32:12 -0600571 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500572free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600573 iscsi_conn_printk(KERN_ERR, conn,
574 "Could not create connection due to crc32c "
575 "loading error. Make sure the crc32c "
576 "module is built as a module or into the "
577 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600578 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600579 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700580}
581
Mike Christie38e1a8f2008-12-02 00:32:12 -0600582static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500583{
Mike Christie22236962007-05-30 12:57:24 -0500584 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500585 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600586 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
587 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500588
Mike Christie22236962007-05-30 12:57:24 -0500589 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500590 return;
591
Mike Christie22236962007-05-30 12:57:24 -0500592 sock_hold(sock->sk);
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500593 iscsi_sw_tcp_conn_restore_callbacks(conn);
Mike Christie22236962007-05-30 12:57:24 -0500594 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500595
Mike Christie22236962007-05-30 12:57:24 -0500596 spin_lock_bh(&session->lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600597 tcp_sw_conn->sock = NULL;
Mike Christie22236962007-05-30 12:57:24 -0500598 spin_unlock_bh(&session->lock);
599 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500600}
601
Mike Christie38e1a8f2008-12-02 00:32:12 -0600602static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700603{
Mike Christie7b8631b2006-01-13 18:05:50 -0600604 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500605 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600606 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700607
Mike Christie38e1a8f2008-12-02 00:32:12 -0600608 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700609
Mike Christie38e1a8f2008-12-02 00:32:12 -0600610 if (tcp_sw_conn->tx_hash.tfm)
611 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
612 if (tcp_sw_conn->rx_hash.tfm)
613 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -0700614
Mike Christie38e1a8f2008-12-02 00:32:12 -0600615 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700616}
617
Mike Christie38e1a8f2008-12-02 00:32:12 -0600618static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500619{
620 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500621 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600622 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christieb64e77f2010-02-10 16:51:47 -0600623 struct socket *sock = tcp_sw_conn->sock;
Mike Christie913e5bf2008-05-21 15:54:18 -0500624
625 /* userspace may have goofed up and not bound us */
Mike Christieb64e77f2010-02-10 16:51:47 -0600626 if (!sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500627 return;
Mike Christie1c834692006-07-24 15:47:26 -0500628
Mike Christie8c38a292010-05-21 18:24:16 -0500629 sock->sk->sk_err = EIO;
630 wake_up_interruptible(sk_sleep(sock->sk));
Mike Christieb64e77f2010-02-10 16:51:47 -0600631
Mike Christie03adb5f2011-06-24 15:11:54 -0500632 /* stop xmit side */
633 iscsi_suspend_tx(conn);
634
635 /* stop recv side and release socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600636 iscsi_sw_tcp_release_conn(conn);
Mike Christie03adb5f2011-06-24 15:11:54 -0500637
638 iscsi_conn_stop(cls_conn, flag);
Mike Christie1c834692006-07-24 15:47:26 -0500639}
640
Alex Aizman7ba24712005-08-04 19:30:08 -0700641static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600642iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
643 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
644 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700645{
Mike Christiea79af8a2011-02-16 15:04:36 -0600646 struct iscsi_session *session = cls_session->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500647 struct iscsi_conn *conn = cls_conn->dd_data;
648 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600649 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700650 struct sock *sk;
651 struct socket *sock;
652 int err;
653
654 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500655 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700656 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600657 iscsi_conn_printk(KERN_ERR, conn,
658 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700659 return -EEXIST;
660 }
661
Mike Christie5bb0b552006-04-06 21:26:46 -0500662 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
663 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500664 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700665
Mike Christiea79af8a2011-02-16 15:04:36 -0600666 spin_lock_bh(&session->lock);
Mike Christie67a61112006-05-30 00:37:20 -0500667 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600668 tcp_sw_conn->sock = sock;
Mike Christiea79af8a2011-02-16 15:04:36 -0600669 spin_unlock_bh(&session->lock);
Alex Aizman7ba24712005-08-04 19:30:08 -0700670
Mike Christie67a61112006-05-30 00:37:20 -0500671 /* setup Socket parameters */
672 sk = sock->sk;
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +0000673 sk->sk_reuse = SK_CAN_REUSE;
Mike Christie67a61112006-05-30 00:37:20 -0500674 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
675 sk->sk_allocation = GFP_ATOMIC;
Mike Christie9e45dd72013-04-10 11:24:39 -0500676 sk_set_memalloc(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700677
Mike Christie38e1a8f2008-12-02 00:32:12 -0600678 iscsi_sw_tcp_conn_set_callbacks(conn);
679 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500680 /*
681 * set receive state machine into initial state
682 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600683 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700684 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500685
686free_socket:
687 sockfd_put(sock);
688 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700689}
690
Mike Christie38e1a8f2008-12-02 00:32:12 -0600691static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
692 enum iscsi_param param, char *buf,
693 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700694{
Mike Christie7b7232f2006-02-01 21:06:49 -0600695 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500696 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600697 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700698
Alex Aizman7ba24712005-08-04 19:30:08 -0700699 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700700 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500701 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700702 break;
703 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500704 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600705 tcp_sw_conn->sendpage = conn->datadgst_en ?
706 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700707 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700708 case ISCSI_PARAM_MAX_R2T:
Mike Christie1304be52012-01-26 21:13:10 -0600709 return iscsi_tcp_set_max_r2t(conn, buf);
Alex Aizman7ba24712005-08-04 19:30:08 -0700710 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500711 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700712 }
713
714 return 0;
715}
716
Mike Christie38e1a8f2008-12-02 00:32:12 -0600717static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
718 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600719{
Mike Christie7b7232f2006-02-01 21:06:49 -0600720 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600721 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
722 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
723 struct sockaddr_in6 addr;
724 int rc, len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600725
726 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500727 case ISCSI_PARAM_CONN_PORT:
Mike Christiefd7255f2006-04-06 21:13:36 -0500728 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie22236962007-05-30 12:57:24 -0500729 spin_lock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600730 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
731 spin_unlock_bh(&conn->session->lock);
732 return -ENOTCONN;
733 }
734 rc = kernel_getpeername(tcp_sw_conn->sock,
735 (struct sockaddr *)&addr, &len);
Mike Christie22236962007-05-30 12:57:24 -0500736 spin_unlock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600737 if (rc)
738 return rc;
739
740 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
741 &addr, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500742 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500743 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500744 }
745
Mike Christiea79af8a2011-02-16 15:04:36 -0600746 return 0;
747}
748
749static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
750 enum iscsi_host_param param, char *buf)
751{
752 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
753 struct iscsi_session *session = tcp_sw_host->session;
754 struct iscsi_conn *conn;
755 struct iscsi_tcp_conn *tcp_conn;
756 struct iscsi_sw_tcp_conn *tcp_sw_conn;
757 struct sockaddr_in6 addr;
758 int rc, len;
759
760 switch (param) {
761 case ISCSI_HOST_PARAM_IPADDRESS:
762 spin_lock_bh(&session->lock);
763 conn = session->leadconn;
764 if (!conn) {
765 spin_unlock_bh(&session->lock);
766 return -ENOTCONN;
767 }
768 tcp_conn = conn->dd_data;
769
770 tcp_sw_conn = tcp_conn->dd_data;
771 if (!tcp_sw_conn->sock) {
772 spin_unlock_bh(&session->lock);
773 return -ENOTCONN;
774 }
775
776 rc = kernel_getsockname(tcp_sw_conn->sock,
777 (struct sockaddr *)&addr, &len);
778 spin_unlock_bh(&session->lock);
779 if (rc)
780 return rc;
781
782 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
783 &addr, param, buf);
784 default:
785 return iscsi_host_get_param(shost, param, buf);
786 }
787
788 return 0;
Mike Christiefd7255f2006-04-06 21:13:36 -0500789}
790
Alex Aizman7ba24712005-08-04 19:30:08 -0700791static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600792iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
793 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700794{
Mike Christie7b7232f2006-02-01 21:06:49 -0600795 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500796 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600797 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700798
Alex Aizman7ba24712005-08-04 19:30:08 -0700799 stats->custom_length = 3;
800 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600801 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700802 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600803 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700804 strcpy(stats->custom[2].desc, "eh_abort_cnt");
805 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600806
807 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700808}
809
Mike Christie5bb0b552006-04-06 21:26:46 -0500810static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600811iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600812 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700813{
Mike Christie5bb0b552006-04-06 21:26:46 -0500814 struct iscsi_cls_session *cls_session;
815 struct iscsi_session *session;
Mike Christiea79af8a2011-02-16 15:04:36 -0600816 struct iscsi_sw_tcp_host *tcp_sw_host;
Mike Christie06520ede2008-05-21 15:54:15 -0500817 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700818
Mike Christie06520ede2008-05-21 15:54:15 -0500819 if (ep) {
820 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500821 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500822 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700823
Mike Christiea79af8a2011-02-16 15:04:36 -0600824 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
825 sizeof(struct iscsi_sw_tcp_host), 1);
Mike Christie75613522008-05-21 15:53:59 -0500826 if (!shost)
827 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600828 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600829 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500830 shost->max_lun = iscsi_max_lun;
831 shost->max_id = 0;
832 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300833 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500834
Mike Christiea4804cd2008-05-21 15:54:00 -0500835 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500836 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500837
Mike Christie38e1a8f2008-12-02 00:32:12 -0600838 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530839 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600840 sizeof(struct iscsi_tcp_task) +
841 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500842 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500843 if (!cls_session)
844 goto remove_host;
845 session = cls_session->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600846 tcp_sw_host = iscsi_host_priv(shost);
847 tcp_sw_host->session = session;
Mike Christie75613522008-05-21 15:53:59 -0500848
Mike Christiefbc514b2008-05-21 15:54:07 -0500849 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600850 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500851 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500852 return cls_session;
853
Mike Christie75613522008-05-21 15:53:59 -0500854remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500855 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500856remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500857 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500858free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500859 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500860 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700861}
862
Mike Christie38e1a8f2008-12-02 00:32:12 -0600863static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500864{
Mike Christie75613522008-05-21 15:53:59 -0500865 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
866
Mike Christie38e1a8f2008-12-02 00:32:12 -0600867 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500868 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500869
Mike Christiea4804cd2008-05-21 15:54:00 -0500870 iscsi_host_remove(shost);
871 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500872}
873
Al Viro587a1f12011-07-23 23:11:19 -0400874static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
Mike Christie3128c6c2011-07-25 13:48:42 -0500875{
876 switch (param_type) {
Mike Christief27fb2e2011-07-25 13:48:45 -0500877 case ISCSI_HOST_PARAM:
878 switch (param) {
879 case ISCSI_HOST_PARAM_NETDEV_NAME:
880 case ISCSI_HOST_PARAM_HWADDRESS:
881 case ISCSI_HOST_PARAM_IPADDRESS:
882 case ISCSI_HOST_PARAM_INITIATOR_NAME:
883 return S_IRUGO;
884 default:
885 return 0;
886 }
Mike Christie3128c6c2011-07-25 13:48:42 -0500887 case ISCSI_PARAM:
888 switch (param) {
889 case ISCSI_PARAM_MAX_RECV_DLENGTH:
890 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
891 case ISCSI_PARAM_HDRDGST_EN:
892 case ISCSI_PARAM_DATADGST_EN:
893 case ISCSI_PARAM_CONN_ADDRESS:
894 case ISCSI_PARAM_CONN_PORT:
895 case ISCSI_PARAM_EXP_STATSN:
896 case ISCSI_PARAM_PERSISTENT_ADDRESS:
897 case ISCSI_PARAM_PERSISTENT_PORT:
898 case ISCSI_PARAM_PING_TMO:
899 case ISCSI_PARAM_RECV_TMO:
Mike Christie1d063c12011-07-25 13:48:43 -0500900 case ISCSI_PARAM_INITIAL_R2T_EN:
901 case ISCSI_PARAM_MAX_R2T:
902 case ISCSI_PARAM_IMM_DATA_EN:
903 case ISCSI_PARAM_FIRST_BURST:
904 case ISCSI_PARAM_MAX_BURST:
905 case ISCSI_PARAM_PDU_INORDER_EN:
906 case ISCSI_PARAM_DATASEQ_INORDER_EN:
907 case ISCSI_PARAM_ERL:
908 case ISCSI_PARAM_TARGET_NAME:
909 case ISCSI_PARAM_TPGT:
910 case ISCSI_PARAM_USERNAME:
911 case ISCSI_PARAM_PASSWORD:
912 case ISCSI_PARAM_USERNAME_IN:
913 case ISCSI_PARAM_PASSWORD_IN:
914 case ISCSI_PARAM_FAST_ABORT:
915 case ISCSI_PARAM_ABORT_TMO:
916 case ISCSI_PARAM_LU_RESET_TMO:
917 case ISCSI_PARAM_TGT_RESET_TMO:
918 case ISCSI_PARAM_IFACE_NAME:
919 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie3128c6c2011-07-25 13:48:42 -0500920 return S_IRUGO;
921 default:
922 return 0;
923 }
924 }
925
926 return 0;
927}
928
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600929static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
930{
931 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
932 return 0;
933}
934
Mike Christie38e1a8f2008-12-02 00:32:12 -0600935static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500936{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500937 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500938 blk_queue_dma_alignment(sdev->request_queue, 0);
939 return 0;
940}
941
Mike Christie38e1a8f2008-12-02 00:32:12 -0600942static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500943 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500944 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500945 .queuecommand = iscsi_queuecommand,
946 .change_queue_depth = iscsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500947 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600948 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600949 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500950 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
951 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600952 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530953 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie5bb0b552006-04-06 21:26:46 -0500954 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600955 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600956 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500957 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500958 .proc_name = "iscsi_tcp",
959 .this_id = -1,
960};
961
Mike Christie38e1a8f2008-12-02 00:32:12 -0600962static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700963 .owner = THIS_MODULE,
964 .name = "tcp",
965 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
966 | CAP_DATADGST,
Mike Christie5bb0b552006-04-06 21:26:46 -0500967 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600968 .create_session = iscsi_sw_tcp_session_create,
969 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500970 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600971 .create_conn = iscsi_sw_tcp_conn_create,
972 .bind_conn = iscsi_sw_tcp_conn_bind,
973 .destroy_conn = iscsi_sw_tcp_conn_destroy,
Mike Christie3128c6c2011-07-25 13:48:42 -0500974 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600975 .set_param = iscsi_sw_tcp_conn_set_param,
976 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600977 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -0700978 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600979 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500980 /* iscsi host params */
Mike Christiea79af8a2011-02-16 15:04:36 -0600981 .get_host_param = iscsi_sw_tcp_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -0500982 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -0500983 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -0700984 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600985 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600986 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -0500987 .init_task = iscsi_tcp_task_init,
988 .xmit_task = iscsi_tcp_task_xmit,
989 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600990 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600991 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
992 .init_pdu = iscsi_sw_tcp_pdu_init,
993 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500994 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -0500995 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -0700996};
997
Mike Christie38e1a8f2008-12-02 00:32:12 -0600998static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700999{
Alex Aizman7ba24712005-08-04 19:30:08 -07001000 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -05001001 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1002 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -07001003 return -EINVAL;
1004 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001005
Mike Christie38e1a8f2008-12-02 00:32:12 -06001006 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1007 &iscsi_sw_tcp_transport);
1008 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -05001009 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -07001010
Mike Christie7b8631b2006-01-13 18:05:50 -06001011 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001012}
1013
Mike Christie38e1a8f2008-12-02 00:32:12 -06001014static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -07001015{
Mike Christie38e1a8f2008-12-02 00:32:12 -06001016 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -07001017}
1018
Mike Christie38e1a8f2008-12-02 00:32:12 -06001019module_init(iscsi_sw_tcp_init);
1020module_exit(iscsi_sw_tcp_exit);