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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
Alex Aizman7ba24712005-08-04 19:30:08 -070058static unsigned int iscsi_max_lun = 512;
59module_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) &&
119 !atomic_read(&sk->sk_rmem_alloc)) {
120 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
121 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
122 return -ECONNRESET;
123 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500124 return 0;
125}
126
Mike Christie38e1a8f2008-12-02 00:32:12 -0600127static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600128{
Mike Christie03adb5f2011-06-24 15:11:54 -0500129 struct iscsi_conn *conn;
130 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600131 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700132
Mike Christie38e1a8f2008-12-02 00:32:12 -0600133 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500134 conn = sk->sk_user_data;
135 if (!conn) {
136 read_unlock(&sk->sk_callback_lock);
137 return;
138 }
139 tcp_conn = conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600140
141 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600142 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
143 * We set count to 1 because we want the network layer to
144 * hand us all the skbs that are available. iscsi_tcp_recv
145 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600146 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600147 rd_desc.arg.data = conn;
148 rd_desc.count = 1;
149 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600150
Mike Christied1af8a32009-08-20 15:11:02 -0500151 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500152
Mike Christie38e1a8f2008-12-02 00:32:12 -0600153 /* If we had to (atomically) map a highmem page,
154 * unmap it now. */
155 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Mike Christie03adb5f2011-06-24 15:11:54 -0500156 read_unlock(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600157}
Alex Aizman7ba24712005-08-04 19:30:08 -0700158
Mike Christie38e1a8f2008-12-02 00:32:12 -0600159static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600160{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600161 struct iscsi_tcp_conn *tcp_conn;
162 struct iscsi_sw_tcp_conn *tcp_sw_conn;
163 struct iscsi_conn *conn;
164 struct iscsi_session *session;
165 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600166
Mike Christie38e1a8f2008-12-02 00:32:12 -0600167 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500168 conn = sk->sk_user_data;
169 if (!conn) {
170 read_unlock(&sk->sk_callback_lock);
171 return;
172 }
Mike Christie38e1a8f2008-12-02 00:32:12 -0600173 session = conn->session;
174
Mike Christied1af8a32009-08-20 15:11:02 -0500175 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700176
Mike Christie38e1a8f2008-12-02 00:32:12 -0600177 tcp_conn = conn->dd_data;
178 tcp_sw_conn = tcp_conn->dd_data;
179 old_state_change = tcp_sw_conn->old_state_change;
180
181 read_unlock(&sk->sk_callback_lock);
182
183 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600184}
Alex Aizman7ba24712005-08-04 19:30:08 -0700185
Olaf Kirchda32dd62007-12-13 12:43:21 -0600186/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600187 * iscsi_write_space - Called when more output buffer space is available
188 * @sk: socket space is available for
189 **/
190static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600191{
Mike Christie03adb5f2011-06-24 15:11:54 -0500192 struct iscsi_conn *conn;
193 struct iscsi_tcp_conn *tcp_conn;
194 struct iscsi_sw_tcp_conn *tcp_sw_conn;
195 void (*old_write_space)(struct sock *);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600196
Mike Christie03adb5f2011-06-24 15:11:54 -0500197 read_lock_bh(&sk->sk_callback_lock);
198 conn = sk->sk_user_data;
199 if (!conn) {
200 read_unlock_bh(&sk->sk_callback_lock);
201 return;
202 }
203
204 tcp_conn = conn->dd_data;
205 tcp_sw_conn = tcp_conn->dd_data;
206 old_write_space = tcp_sw_conn->old_write_space;
207 read_unlock_bh(&sk->sk_callback_lock);
208
209 old_write_space(sk);
210
Mike Christiec93f87c2009-03-05 14:46:00 -0600211 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600212 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600213}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600214
Mike Christie38e1a8f2008-12-02 00:32:12 -0600215static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
216{
217 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
218 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
219 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600220
Mike Christie38e1a8f2008-12-02 00:32:12 -0600221 /* assign new callbacks */
222 write_lock_bh(&sk->sk_callback_lock);
223 sk->sk_user_data = conn;
224 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
225 tcp_sw_conn->old_state_change = sk->sk_state_change;
226 tcp_sw_conn->old_write_space = sk->sk_write_space;
227 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
228 sk->sk_state_change = iscsi_sw_tcp_state_change;
229 sk->sk_write_space = iscsi_sw_tcp_write_space;
230 write_unlock_bh(&sk->sk_callback_lock);
231}
Alex Aizman7ba24712005-08-04 19:30:08 -0700232
Mike Christie38e1a8f2008-12-02 00:32:12 -0600233static void
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500234iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600235{
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500236 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
237 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600238 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600239
Mike Christie38e1a8f2008-12-02 00:32:12 -0600240 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
241 write_lock_bh(&sk->sk_callback_lock);
242 sk->sk_user_data = NULL;
243 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
244 sk->sk_state_change = tcp_sw_conn->old_state_change;
245 sk->sk_write_space = tcp_sw_conn->old_write_space;
246 sk->sk_no_check = 0;
247 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600248}
249
250/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600251 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600252 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600253 * @segment: the buffer to transmnit
254 *
255 * This function transmits as much of the buffer as
256 * the network layer will accept, and returns the number of
257 * bytes transmitted.
258 *
259 * If CRC hashing is enabled, the function will compute the
260 * hash as it goes. When the entire segment has been transmitted,
261 * it will retrieve the hash value and send it as well.
262 */
Mike Christie6df19a72008-12-02 00:32:16 -0600263static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600264 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600265{
Mike Christie6df19a72008-12-02 00:32:16 -0600266 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600267 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600268 unsigned int copied = 0;
269 int r = 0;
270
Mike Christie6df19a72008-12-02 00:32:16 -0600271 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600272 struct scatterlist *sg;
273 unsigned int offset, copy;
274 int flags = 0;
275
276 r = 0;
277 offset = segment->copied;
278 copy = segment->size - offset;
279
280 if (segment->total_copied + segment->size < segment->total_size)
281 flags |= MSG_MORE;
282
283 /* Use sendpage if we can; else fall back to sendmsg */
284 if (!segment->data) {
285 sg = segment->sg;
286 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600287 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
288 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600289 } else {
290 struct msghdr msg = { .msg_flags = flags };
291 struct kvec iov = {
292 .iov_base = segment->data + offset,
293 .iov_len = copy
294 };
295
296 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
297 }
298
299 if (r < 0) {
300 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600301 return r;
302 }
303 copied += r;
304 }
305 return copied;
306}
307
308/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600309 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700310 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600311static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700312{
Mike Christie5bb0b552006-04-06 21:26:46 -0500313 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600314 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
315 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600316 unsigned int consumed = 0;
317 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700318
Olaf Kircha8ac6312007-12-13 12:43:35 -0600319 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600320 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500321 /*
322 * We may not have been able to send data because the conn
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300323 * is getting stopped. libiscsi will know so propagate err
Mike Christie32382492009-06-15 22:11:09 -0500324 * for it to do the right thing.
325 */
326 if (rc == -EAGAIN)
327 return rc;
328 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500329 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600330 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500331 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600332 break;
333
334 consumed += rc;
335
336 if (segment->total_copied >= segment->total_size) {
337 if (segment->done != NULL) {
338 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500339 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600340 goto error;
341 }
342 }
343 }
344
Mike Christiec93f87c2009-03-05 14:46:00 -0600345 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600346
347 conn->txdata_octets += consumed;
348 return consumed;
349
350error:
351 /* Transmit error. We could initiate error recovery
352 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600353 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500354 iscsi_conn_failure(conn, rc);
355 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600356}
357
358/**
359 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
360 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600361static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600362{
363 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600364 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
365 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600366
367 return segment->total_copied - segment->total_size;
368}
369
Mike Christie38e1a8f2008-12-02 00:32:12 -0600370static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600371{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600372 struct iscsi_conn *conn = task->conn;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600373 int rc;
374
Mike Christie38e1a8f2008-12-02 00:32:12 -0600375 while (iscsi_sw_tcp_xmit_qlen(conn)) {
376 rc = iscsi_sw_tcp_xmit(conn);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600377 if (rc == 0)
378 return -EAGAIN;
379 if (rc < 0)
380 return rc;
381 }
382
383 return 0;
384}
385
386/*
387 * This is called when we're done sending the header.
388 * Simply copy the data_segment to the send segment, and return.
389 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600390static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
391 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600392{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600393 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
394
395 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600396 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
397 "Header done. Next segment size %u total_size %u\n",
398 tcp_sw_conn->out.segment.size,
399 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600400 return 0;
401}
402
Mike Christie38e1a8f2008-12-02 00:32:12 -0600403static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
404 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600405{
406 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600407 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600408
Mike Christiec93f87c2009-03-05 14:46:00 -0600409 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
410 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600411
412 /* Clear the data segment - needs to be filled in by the
413 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600414 memset(&tcp_sw_conn->out.data_segment, 0,
415 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600416
417 /* If header digest is enabled, compute the CRC and
418 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500419 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600420 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600421 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600422 if (conn->hdrdgst_en) {
Mike Christie38e1a8f2008-12-02 00:32:12 -0600423 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600424 hdr + hdrlen);
425 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500426 }
427
Olaf Kircha8ac6312007-12-13 12:43:35 -0600428 /* Remember header pointer for later, when we need
429 * to decide whether there's a payload to go along
430 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600431 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600432
Mike Christie38e1a8f2008-12-02 00:32:12 -0600433 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
434 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700435}
436
Olaf Kircha8ac6312007-12-13 12:43:35 -0600437/*
438 * Prepare the send buffer for the payload data.
439 * Padding and checksumming will all be taken care
440 * of by the iscsi_segment routines.
441 */
442static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600443iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
444 unsigned int count, unsigned int offset,
445 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700446{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600447 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600448 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600449 struct hash_desc *tx_hash = NULL;
450 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700451
Mike Christiec93f87c2009-03-05 14:46:00 -0600452 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
453 conn->datadgst_en ?
454 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700455
Olaf Kircha8ac6312007-12-13 12:43:35 -0600456 /* Make sure the datalen matches what the caller
457 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600458 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600459 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700460
Olaf Kircha8ac6312007-12-13 12:43:35 -0600461 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600462 tx_hash = &tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600463
Mike Christie38e1a8f2008-12-02 00:32:12 -0600464 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
465 sg, count, offset, len,
466 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700467}
468
Olaf Kircha8ac6312007-12-13 12:43:35 -0600469static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600470iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600471 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700472{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600473 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600474 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600475 struct hash_desc *tx_hash = NULL;
476 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700477
Mike Christiec93f87c2009-03-05 14:46:00 -0600478 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
479 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700480
Olaf Kircha8ac6312007-12-13 12:43:35 -0600481 /* Make sure the datalen matches what the caller
482 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600483 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600484 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700485
Olaf Kircha8ac6312007-12-13 12:43:35 -0600486 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600487 tx_hash = &tcp_sw_conn->tx_hash;
Alex Aizman7ba24712005-08-04 19:30:08 -0700488
Mike Christie38e1a8f2008-12-02 00:32:12 -0600489 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600490 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700491}
492
Mike Christie38e1a8f2008-12-02 00:32:12 -0600493static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
494 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600495{
496 struct iscsi_conn *conn = task->conn;
497 int err = 0;
498
Mike Christie38e1a8f2008-12-02 00:32:12 -0600499 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600500
501 if (!count)
502 return 0;
503
504 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600505 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600506 else {
507 struct scsi_data_buffer *sdb = scsi_out(task->sc);
508
Mike Christie38e1a8f2008-12-02 00:32:12 -0600509 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
510 sdb->table.nents, offset,
511 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600512 }
513
514 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500515 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600516 return -EIO;
517 }
518 return 0;
519}
520
Mike Christie2ff79d52008-12-02 00:32:14 -0600521static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600522{
523 struct iscsi_tcp_task *tcp_task = task->dd_data;
524
Mike Christie38e1a8f2008-12-02 00:32:12 -0600525 task->hdr = task->dd_data + sizeof(*tcp_task);
526 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600527 return 0;
528}
529
Mike Christie7b8631b2006-01-13 18:05:50 -0600530static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600531iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
532 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700533{
Mike Christie7b8631b2006-01-13 18:05:50 -0600534 struct iscsi_conn *conn;
535 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500536 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600537 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700538
Mike Christie38e1a8f2008-12-02 00:32:12 -0600539 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
540 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600541 if (!cls_conn)
542 return NULL;
543 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500544 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600545 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700546
Mike Christie38e1a8f2008-12-02 00:32:12 -0600547 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
548 CRYPTO_ALG_ASYNC);
549 tcp_sw_conn->tx_hash.flags = 0;
550 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500551 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400552
Mike Christie38e1a8f2008-12-02 00:32:12 -0600553 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
554 CRYPTO_ALG_ASYNC);
555 tcp_sw_conn->rx_hash.flags = 0;
556 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
Mike Christiedd8c0d92006-08-31 18:09:28 -0400557 goto free_tx_tfm;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600558 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400559
Mike Christie7b8631b2006-01-13 18:05:50 -0600560 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700561
Mike Christiedd8c0d92006-08-31 18:09:28 -0400562free_tx_tfm:
Mike Christie38e1a8f2008-12-02 00:32:12 -0600563 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500564free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600565 iscsi_conn_printk(KERN_ERR, conn,
566 "Could not create connection due to crc32c "
567 "loading error. Make sure the crc32c "
568 "module is built as a module or into the "
569 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600570 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600571 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700572}
573
Mike Christie38e1a8f2008-12-02 00:32:12 -0600574static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500575{
Mike Christie22236962007-05-30 12:57:24 -0500576 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500577 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600578 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
579 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500580
Mike Christie22236962007-05-30 12:57:24 -0500581 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500582 return;
583
Mike Christie22236962007-05-30 12:57:24 -0500584 sock_hold(sock->sk);
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500585 iscsi_sw_tcp_conn_restore_callbacks(conn);
Mike Christie22236962007-05-30 12:57:24 -0500586 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500587
Mike Christie22236962007-05-30 12:57:24 -0500588 spin_lock_bh(&session->lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600589 tcp_sw_conn->sock = NULL;
Mike Christie22236962007-05-30 12:57:24 -0500590 spin_unlock_bh(&session->lock);
591 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500592}
593
Mike Christie38e1a8f2008-12-02 00:32:12 -0600594static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700595{
Mike Christie7b8631b2006-01-13 18:05:50 -0600596 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500597 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600598 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700599
Mike Christie38e1a8f2008-12-02 00:32:12 -0600600 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700601
Mike Christie38e1a8f2008-12-02 00:32:12 -0600602 if (tcp_sw_conn->tx_hash.tfm)
603 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
604 if (tcp_sw_conn->rx_hash.tfm)
605 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -0700606
Mike Christie38e1a8f2008-12-02 00:32:12 -0600607 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700608}
609
Mike Christie38e1a8f2008-12-02 00:32:12 -0600610static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500611{
612 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500613 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600614 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christieb64e77f2010-02-10 16:51:47 -0600615 struct socket *sock = tcp_sw_conn->sock;
Mike Christie913e5bf2008-05-21 15:54:18 -0500616
617 /* userspace may have goofed up and not bound us */
Mike Christieb64e77f2010-02-10 16:51:47 -0600618 if (!sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500619 return;
Mike Christie1c834692006-07-24 15:47:26 -0500620
Mike Christie8c38a292010-05-21 18:24:16 -0500621 sock->sk->sk_err = EIO;
622 wake_up_interruptible(sk_sleep(sock->sk));
Mike Christieb64e77f2010-02-10 16:51:47 -0600623
Mike Christie03adb5f2011-06-24 15:11:54 -0500624 /* stop xmit side */
625 iscsi_suspend_tx(conn);
626
627 /* stop recv side and release socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600628 iscsi_sw_tcp_release_conn(conn);
Mike Christie03adb5f2011-06-24 15:11:54 -0500629
630 iscsi_conn_stop(cls_conn, flag);
Mike Christie1c834692006-07-24 15:47:26 -0500631}
632
Alex Aizman7ba24712005-08-04 19:30:08 -0700633static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600634iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
635 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
636 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700637{
Mike Christiea79af8a2011-02-16 15:04:36 -0600638 struct iscsi_session *session = cls_session->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500639 struct iscsi_conn *conn = cls_conn->dd_data;
640 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600641 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700642 struct sock *sk;
643 struct socket *sock;
644 int err;
645
646 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500647 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700648 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600649 iscsi_conn_printk(KERN_ERR, conn,
650 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700651 return -EEXIST;
652 }
653
Mike Christie5bb0b552006-04-06 21:26:46 -0500654 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
655 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500656 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700657
Mike Christiea79af8a2011-02-16 15:04:36 -0600658 spin_lock_bh(&session->lock);
Mike Christie67a61112006-05-30 00:37:20 -0500659 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600660 tcp_sw_conn->sock = sock;
Mike Christiea79af8a2011-02-16 15:04:36 -0600661 spin_unlock_bh(&session->lock);
Alex Aizman7ba24712005-08-04 19:30:08 -0700662
Mike Christie67a61112006-05-30 00:37:20 -0500663 /* setup Socket parameters */
664 sk = sock->sk;
665 sk->sk_reuse = 1;
666 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
667 sk->sk_allocation = GFP_ATOMIC;
Alex Aizman7ba24712005-08-04 19:30:08 -0700668
Mike Christie38e1a8f2008-12-02 00:32:12 -0600669 iscsi_sw_tcp_conn_set_callbacks(conn);
670 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500671 /*
672 * set receive state machine into initial state
673 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600674 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700675 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500676
677free_socket:
678 sockfd_put(sock);
679 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700680}
681
Mike Christie38e1a8f2008-12-02 00:32:12 -0600682static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
683 enum iscsi_param param, char *buf,
684 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700685{
Mike Christie7b7232f2006-02-01 21:06:49 -0600686 struct iscsi_conn *conn = cls_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700687 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500688 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600689 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500690 int value;
Alex Aizman7ba24712005-08-04 19:30:08 -0700691
Alex Aizman7ba24712005-08-04 19:30:08 -0700692 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700693 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500694 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700695 break;
696 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500697 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600698 tcp_sw_conn->sendpage = conn->datadgst_en ?
699 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700700 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700701 case ISCSI_PARAM_MAX_R2T:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500702 sscanf(buf, "%d", &value);
Mike Christiedf93ffc2007-12-13 12:43:42 -0600703 if (value <= 0 || !is_power_of_2(value))
704 return -EINVAL;
705 if (session->max_r2t == value)
Alex Aizman7ba24712005-08-04 19:30:08 -0700706 break;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600707 iscsi_tcp_r2tpool_free(session);
Mike Christie5c75b7f2006-06-28 12:00:26 -0500708 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600709 if (iscsi_tcp_r2tpool_alloc(session))
Alex Aizman7ba24712005-08-04 19:30:08 -0700710 return -ENOMEM;
711 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700712 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500713 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700714 }
715
716 return 0;
717}
718
Mike Christie38e1a8f2008-12-02 00:32:12 -0600719static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
720 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600721{
Mike Christie7b7232f2006-02-01 21:06:49 -0600722 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600723 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
724 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
725 struct sockaddr_in6 addr;
726 int rc, len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600727
728 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500729 case ISCSI_PARAM_CONN_PORT:
Mike Christiefd7255f2006-04-06 21:13:36 -0500730 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie22236962007-05-30 12:57:24 -0500731 spin_lock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600732 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
733 spin_unlock_bh(&conn->session->lock);
734 return -ENOTCONN;
735 }
736 rc = kernel_getpeername(tcp_sw_conn->sock,
737 (struct sockaddr *)&addr, &len);
Mike Christie22236962007-05-30 12:57:24 -0500738 spin_unlock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600739 if (rc)
740 return rc;
741
742 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
743 &addr, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500744 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500745 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500746 }
747
Mike Christiea79af8a2011-02-16 15:04:36 -0600748 return 0;
749}
750
751static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
752 enum iscsi_host_param param, char *buf)
753{
754 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
755 struct iscsi_session *session = tcp_sw_host->session;
756 struct iscsi_conn *conn;
757 struct iscsi_tcp_conn *tcp_conn;
758 struct iscsi_sw_tcp_conn *tcp_sw_conn;
759 struct sockaddr_in6 addr;
760 int rc, len;
761
762 switch (param) {
763 case ISCSI_HOST_PARAM_IPADDRESS:
764 spin_lock_bh(&session->lock);
765 conn = session->leadconn;
766 if (!conn) {
767 spin_unlock_bh(&session->lock);
768 return -ENOTCONN;
769 }
770 tcp_conn = conn->dd_data;
771
772 tcp_sw_conn = tcp_conn->dd_data;
773 if (!tcp_sw_conn->sock) {
774 spin_unlock_bh(&session->lock);
775 return -ENOTCONN;
776 }
777
778 rc = kernel_getsockname(tcp_sw_conn->sock,
779 (struct sockaddr *)&addr, &len);
780 spin_unlock_bh(&session->lock);
781 if (rc)
782 return rc;
783
784 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
785 &addr, param, buf);
786 default:
787 return iscsi_host_get_param(shost, param, buf);
788 }
789
790 return 0;
Mike Christiefd7255f2006-04-06 21:13:36 -0500791}
792
Alex Aizman7ba24712005-08-04 19:30:08 -0700793static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600794iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
795 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700796{
Mike Christie7b7232f2006-02-01 21:06:49 -0600797 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500798 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600799 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700800
Alex Aizman7ba24712005-08-04 19:30:08 -0700801 stats->custom_length = 3;
802 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600803 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700804 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600805 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700806 strcpy(stats->custom[2].desc, "eh_abort_cnt");
807 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600808
809 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700810}
811
Mike Christie5bb0b552006-04-06 21:26:46 -0500812static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600813iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600814 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700815{
Mike Christie5bb0b552006-04-06 21:26:46 -0500816 struct iscsi_cls_session *cls_session;
817 struct iscsi_session *session;
Mike Christiea79af8a2011-02-16 15:04:36 -0600818 struct iscsi_sw_tcp_host *tcp_sw_host;
Mike Christie06520ede2008-05-21 15:54:15 -0500819 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700820
Mike Christie06520ede2008-05-21 15:54:15 -0500821 if (ep) {
822 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500823 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500824 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700825
Mike Christiea79af8a2011-02-16 15:04:36 -0600826 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
827 sizeof(struct iscsi_sw_tcp_host), 1);
Mike Christie75613522008-05-21 15:53:59 -0500828 if (!shost)
829 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600830 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600831 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500832 shost->max_lun = iscsi_max_lun;
833 shost->max_id = 0;
834 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300835 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500836
Mike Christiea4804cd2008-05-21 15:54:00 -0500837 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500838 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500839
Mike Christie38e1a8f2008-12-02 00:32:12 -0600840 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530841 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600842 sizeof(struct iscsi_tcp_task) +
843 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500844 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500845 if (!cls_session)
846 goto remove_host;
847 session = cls_session->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600848 tcp_sw_host = iscsi_host_priv(shost);
849 tcp_sw_host->session = session;
Mike Christie75613522008-05-21 15:53:59 -0500850
Mike Christiefbc514b2008-05-21 15:54:07 -0500851 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600852 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500853 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500854 return cls_session;
855
Mike Christie75613522008-05-21 15:53:59 -0500856remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500857 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500858remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500859 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500860free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500861 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500862 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700863}
864
Mike Christie38e1a8f2008-12-02 00:32:12 -0600865static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500866{
Mike Christie75613522008-05-21 15:53:59 -0500867 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
868
Mike Christie38e1a8f2008-12-02 00:32:12 -0600869 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500870 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500871
Mike Christiea4804cd2008-05-21 15:54:00 -0500872 iscsi_host_remove(shost);
873 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500874}
875
Mike Christie3128c6c2011-07-25 13:48:42 -0500876static mode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
877{
878 switch (param_type) {
Mike Christief27fb2e2011-07-25 13:48:45 -0500879 case ISCSI_HOST_PARAM:
880 switch (param) {
881 case ISCSI_HOST_PARAM_NETDEV_NAME:
882 case ISCSI_HOST_PARAM_HWADDRESS:
883 case ISCSI_HOST_PARAM_IPADDRESS:
884 case ISCSI_HOST_PARAM_INITIATOR_NAME:
885 return S_IRUGO;
886 default:
887 return 0;
888 }
Mike Christie3128c6c2011-07-25 13:48:42 -0500889 case ISCSI_PARAM:
890 switch (param) {
891 case ISCSI_PARAM_MAX_RECV_DLENGTH:
892 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
893 case ISCSI_PARAM_HDRDGST_EN:
894 case ISCSI_PARAM_DATADGST_EN:
895 case ISCSI_PARAM_CONN_ADDRESS:
896 case ISCSI_PARAM_CONN_PORT:
897 case ISCSI_PARAM_EXP_STATSN:
898 case ISCSI_PARAM_PERSISTENT_ADDRESS:
899 case ISCSI_PARAM_PERSISTENT_PORT:
900 case ISCSI_PARAM_PING_TMO:
901 case ISCSI_PARAM_RECV_TMO:
Mike Christie1d063c12011-07-25 13:48:43 -0500902 case ISCSI_PARAM_INITIAL_R2T_EN:
903 case ISCSI_PARAM_MAX_R2T:
904 case ISCSI_PARAM_IMM_DATA_EN:
905 case ISCSI_PARAM_FIRST_BURST:
906 case ISCSI_PARAM_MAX_BURST:
907 case ISCSI_PARAM_PDU_INORDER_EN:
908 case ISCSI_PARAM_DATASEQ_INORDER_EN:
909 case ISCSI_PARAM_ERL:
910 case ISCSI_PARAM_TARGET_NAME:
911 case ISCSI_PARAM_TPGT:
912 case ISCSI_PARAM_USERNAME:
913 case ISCSI_PARAM_PASSWORD:
914 case ISCSI_PARAM_USERNAME_IN:
915 case ISCSI_PARAM_PASSWORD_IN:
916 case ISCSI_PARAM_FAST_ABORT:
917 case ISCSI_PARAM_ABORT_TMO:
918 case ISCSI_PARAM_LU_RESET_TMO:
919 case ISCSI_PARAM_TGT_RESET_TMO:
920 case ISCSI_PARAM_IFACE_NAME:
921 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie3128c6c2011-07-25 13:48:42 -0500922 return S_IRUGO;
923 default:
924 return 0;
925 }
926 }
927
928 return 0;
929}
930
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600931static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
932{
933 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
934 return 0;
935}
936
Mike Christie38e1a8f2008-12-02 00:32:12 -0600937static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500938{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500939 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500940 blk_queue_dma_alignment(sdev->request_queue, 0);
941 return 0;
942}
943
Mike Christie38e1a8f2008-12-02 00:32:12 -0600944static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500945 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500946 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500947 .queuecommand = iscsi_queuecommand,
948 .change_queue_depth = iscsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500949 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600950 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600951 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500952 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
953 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600954 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530955 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie5bb0b552006-04-06 21:26:46 -0500956 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600957 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600958 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500959 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500960 .proc_name = "iscsi_tcp",
961 .this_id = -1,
962};
963
Mike Christie38e1a8f2008-12-02 00:32:12 -0600964static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700965 .owner = THIS_MODULE,
966 .name = "tcp",
967 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
968 | CAP_DATADGST,
Mike Christie5bb0b552006-04-06 21:26:46 -0500969 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600970 .create_session = iscsi_sw_tcp_session_create,
971 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500972 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600973 .create_conn = iscsi_sw_tcp_conn_create,
974 .bind_conn = iscsi_sw_tcp_conn_bind,
975 .destroy_conn = iscsi_sw_tcp_conn_destroy,
Mike Christie3128c6c2011-07-25 13:48:42 -0500976 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600977 .set_param = iscsi_sw_tcp_conn_set_param,
978 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600979 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -0700980 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600981 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500982 /* iscsi host params */
Mike Christiea79af8a2011-02-16 15:04:36 -0600983 .get_host_param = iscsi_sw_tcp_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -0500984 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -0500985 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -0700986 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600987 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600988 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -0500989 .init_task = iscsi_tcp_task_init,
990 .xmit_task = iscsi_tcp_task_xmit,
991 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600992 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600993 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
994 .init_pdu = iscsi_sw_tcp_pdu_init,
995 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500996 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -0500997 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -0700998};
999
Mike Christie38e1a8f2008-12-02 00:32:12 -06001000static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -07001001{
Alex Aizman7ba24712005-08-04 19:30:08 -07001002 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -05001003 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1004 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -07001005 return -EINVAL;
1006 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001007
Mike Christie38e1a8f2008-12-02 00:32:12 -06001008 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1009 &iscsi_sw_tcp_transport);
1010 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -05001011 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -07001012
Mike Christie7b8631b2006-01-13 18:05:50 -06001013 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001014}
1015
Mike Christie38e1a8f2008-12-02 00:32:12 -06001016static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -07001017{
Mike Christie38e1a8f2008-12-02 00:32:12 -06001018 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -07001019}
1020
Mike Christie38e1a8f2008-12-02 00:32:12 -06001021module_init(iscsi_sw_tcp_init);
1022module_exit(iscsi_sw_tcp_exit);