blob: 7724414588fa9b2c076530298b0b6c0d280ae685 [file] [log] [blame]
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>
38#include <net/tcp.h>
39#include <scsi/scsi_cmnd.h>
Mike Christied1d81c02007-05-30 12:57:21 -050040#include <scsi/scsi_device.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070041#include <scsi/scsi_host.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_transport_iscsi.h>
44
45#include "iscsi_tcp.h"
46
Mike Christie38e1a8f2008-12-02 00:32:12 -060047MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
48 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
Alex Aizman7ba24712005-08-04 19:30:08 -070049 "Alex Aizman <itn780@yahoo.com>");
50MODULE_DESCRIPTION("iSCSI/TCP data-path");
51MODULE_LICENSE("GPL");
Alex Aizman7ba24712005-08-04 19:30:08 -070052
Mike Christie38e1a8f2008-12-02 00:32:12 -060053static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
54static struct scsi_host_template iscsi_sw_tcp_sht;
55static struct iscsi_transport iscsi_sw_tcp_transport;
Mike Christie75613522008-05-21 15:53:59 -050056
Alex Aizman7ba24712005-08-04 19:30:08 -070057static unsigned int iscsi_max_lun = 512;
58module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
59
Mike Christiec93f87c2009-03-05 14:46:00 -060060static int iscsi_sw_tcp_dbg;
61module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
62 S_IRUGO | S_IWUSR);
63MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
64 "Set to 1 to turn on, and zero to turn off. Default is off.");
65
66#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
67 do { \
68 if (iscsi_sw_tcp_dbg) \
69 iscsi_conn_printk(KERN_INFO, _conn, \
70 "%s " dbg_fmt, \
71 __func__, ##arg); \
72 } while (0);
73
74
Olaf Kirchda32dd62007-12-13 12:43:21 -060075/**
Mike Christie38e1a8f2008-12-02 00:32:12 -060076 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
77 * @rd_desc: read descriptor
78 * @skb: socket buffer
79 * @offset: offset in skb
80 * @len: skb->len - offset
Olaf Kirchda32dd62007-12-13 12:43:21 -060081 */
Mike Christie38e1a8f2008-12-02 00:32:12 -060082static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
83 unsigned int offset, size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -070084{
Mike Christie38e1a8f2008-12-02 00:32:12 -060085 struct iscsi_conn *conn = rd_desc->arg.data;
86 unsigned int consumed, total_consumed = 0;
87 int status;
88
Mike Christiec93f87c2009-03-05 14:46:00 -060089 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
Mike Christie38e1a8f2008-12-02 00:32:12 -060090
91 do {
92 status = 0;
93 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
94 offset += consumed;
95 total_consumed += consumed;
96 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
97
Mike Christiec93f87c2009-03-05 14:46:00 -060098 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
99 skb->len - offset, status);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600100 return total_consumed;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600101}
Alex Aizman7ba24712005-08-04 19:30:08 -0700102
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500103/**
104 * iscsi_sw_sk_state_check - check socket state
105 * @sk: socket
106 *
107 * If the socket is in CLOSE or CLOSE_WAIT we should
108 * not close the connection if there is still some
109 * data pending.
Mike Christie03adb5f2011-06-24 15:11:54 -0500110 *
111 * Must be called with sk_callback_lock.
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500112 */
113static inline int iscsi_sw_sk_state_check(struct sock *sk)
114{
Mike Christie03adb5f2011-06-24 15:11:54 -0500115 struct iscsi_conn *conn = sk->sk_user_data;
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500116
Mike Christied1af8a32009-08-20 15:11:02 -0500117 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
118 !atomic_read(&sk->sk_rmem_alloc)) {
119 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
120 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
121 return -ECONNRESET;
122 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500123 return 0;
124}
125
Mike Christie38e1a8f2008-12-02 00:32:12 -0600126static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600127{
Mike Christie03adb5f2011-06-24 15:11:54 -0500128 struct iscsi_conn *conn;
129 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600130 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700131
Mike Christie38e1a8f2008-12-02 00:32:12 -0600132 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500133 conn = sk->sk_user_data;
134 if (!conn) {
135 read_unlock(&sk->sk_callback_lock);
136 return;
137 }
138 tcp_conn = conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600139
140 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600141 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
142 * We set count to 1 because we want the network layer to
143 * hand us all the skbs that are available. iscsi_tcp_recv
144 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600145 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600146 rd_desc.arg.data = conn;
147 rd_desc.count = 1;
148 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600149
Mike Christied1af8a32009-08-20 15:11:02 -0500150 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500151
Mike Christie38e1a8f2008-12-02 00:32:12 -0600152 /* If we had to (atomically) map a highmem page,
153 * unmap it now. */
154 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Mike Christie03adb5f2011-06-24 15:11:54 -0500155 read_unlock(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600156}
Alex Aizman7ba24712005-08-04 19:30:08 -0700157
Mike Christie38e1a8f2008-12-02 00:32:12 -0600158static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600159{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600160 struct iscsi_tcp_conn *tcp_conn;
161 struct iscsi_sw_tcp_conn *tcp_sw_conn;
162 struct iscsi_conn *conn;
163 struct iscsi_session *session;
164 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600165
Mike Christie38e1a8f2008-12-02 00:32:12 -0600166 read_lock(&sk->sk_callback_lock);
Mike Christie03adb5f2011-06-24 15:11:54 -0500167 conn = sk->sk_user_data;
168 if (!conn) {
169 read_unlock(&sk->sk_callback_lock);
170 return;
171 }
Mike Christie38e1a8f2008-12-02 00:32:12 -0600172 session = conn->session;
173
Mike Christied1af8a32009-08-20 15:11:02 -0500174 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700175
Mike Christie38e1a8f2008-12-02 00:32:12 -0600176 tcp_conn = conn->dd_data;
177 tcp_sw_conn = tcp_conn->dd_data;
178 old_state_change = tcp_sw_conn->old_state_change;
179
180 read_unlock(&sk->sk_callback_lock);
181
182 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600183}
Alex Aizman7ba24712005-08-04 19:30:08 -0700184
Olaf Kirchda32dd62007-12-13 12:43:21 -0600185/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600186 * iscsi_write_space - Called when more output buffer space is available
187 * @sk: socket space is available for
188 **/
189static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600190{
Mike Christie03adb5f2011-06-24 15:11:54 -0500191 struct iscsi_conn *conn;
192 struct iscsi_tcp_conn *tcp_conn;
193 struct iscsi_sw_tcp_conn *tcp_sw_conn;
194 void (*old_write_space)(struct sock *);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600195
Mike Christie03adb5f2011-06-24 15:11:54 -0500196 read_lock_bh(&sk->sk_callback_lock);
197 conn = sk->sk_user_data;
198 if (!conn) {
199 read_unlock_bh(&sk->sk_callback_lock);
200 return;
201 }
202
203 tcp_conn = conn->dd_data;
204 tcp_sw_conn = tcp_conn->dd_data;
205 old_write_space = tcp_sw_conn->old_write_space;
206 read_unlock_bh(&sk->sk_callback_lock);
207
208 old_write_space(sk);
209
Mike Christiec93f87c2009-03-05 14:46:00 -0600210 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600211 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600212}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600213
Mike Christie38e1a8f2008-12-02 00:32:12 -0600214static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
215{
216 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
217 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
218 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600219
Mike Christie38e1a8f2008-12-02 00:32:12 -0600220 /* assign new callbacks */
221 write_lock_bh(&sk->sk_callback_lock);
222 sk->sk_user_data = conn;
223 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
224 tcp_sw_conn->old_state_change = sk->sk_state_change;
225 tcp_sw_conn->old_write_space = sk->sk_write_space;
226 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
227 sk->sk_state_change = iscsi_sw_tcp_state_change;
228 sk->sk_write_space = iscsi_sw_tcp_write_space;
229 write_unlock_bh(&sk->sk_callback_lock);
230}
Alex Aizman7ba24712005-08-04 19:30:08 -0700231
Mike Christie38e1a8f2008-12-02 00:32:12 -0600232static void
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500233iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600234{
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500235 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
236 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600237 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600238
Mike Christie38e1a8f2008-12-02 00:32:12 -0600239 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
240 write_lock_bh(&sk->sk_callback_lock);
241 sk->sk_user_data = NULL;
242 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
243 sk->sk_state_change = tcp_sw_conn->old_state_change;
244 sk->sk_write_space = tcp_sw_conn->old_write_space;
245 sk->sk_no_check = 0;
246 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600247}
248
249/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600250 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600251 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600252 * @segment: the buffer to transmnit
253 *
254 * This function transmits as much of the buffer as
255 * the network layer will accept, and returns the number of
256 * bytes transmitted.
257 *
258 * If CRC hashing is enabled, the function will compute the
259 * hash as it goes. When the entire segment has been transmitted,
260 * it will retrieve the hash value and send it as well.
261 */
Mike Christie6df19a72008-12-02 00:32:16 -0600262static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600263 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600264{
Mike Christie6df19a72008-12-02 00:32:16 -0600265 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600266 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600267 unsigned int copied = 0;
268 int r = 0;
269
Mike Christie6df19a72008-12-02 00:32:16 -0600270 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600271 struct scatterlist *sg;
272 unsigned int offset, copy;
273 int flags = 0;
274
275 r = 0;
276 offset = segment->copied;
277 copy = segment->size - offset;
278
279 if (segment->total_copied + segment->size < segment->total_size)
280 flags |= MSG_MORE;
281
282 /* Use sendpage if we can; else fall back to sendmsg */
283 if (!segment->data) {
284 sg = segment->sg;
285 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600286 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
287 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600288 } else {
289 struct msghdr msg = { .msg_flags = flags };
290 struct kvec iov = {
291 .iov_base = segment->data + offset,
292 .iov_len = copy
293 };
294
295 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
296 }
297
298 if (r < 0) {
299 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600300 return r;
301 }
302 copied += r;
303 }
304 return copied;
305}
306
307/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600308 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700309 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600310static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700311{
Mike Christie5bb0b552006-04-06 21:26:46 -0500312 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600313 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
314 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600315 unsigned int consumed = 0;
316 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700317
Olaf Kircha8ac6312007-12-13 12:43:35 -0600318 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600319 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500320 /*
321 * We may not have been able to send data because the conn
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300322 * is getting stopped. libiscsi will know so propagate err
Mike Christie32382492009-06-15 22:11:09 -0500323 * for it to do the right thing.
324 */
325 if (rc == -EAGAIN)
326 return rc;
327 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500328 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600329 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500330 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600331 break;
332
333 consumed += rc;
334
335 if (segment->total_copied >= segment->total_size) {
336 if (segment->done != NULL) {
337 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500338 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600339 goto error;
340 }
341 }
342 }
343
Mike Christiec93f87c2009-03-05 14:46:00 -0600344 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600345
346 conn->txdata_octets += consumed;
347 return consumed;
348
349error:
350 /* Transmit error. We could initiate error recovery
351 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600352 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500353 iscsi_conn_failure(conn, rc);
354 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600355}
356
357/**
358 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
359 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600360static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600361{
362 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600363 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
364 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600365
366 return segment->total_copied - segment->total_size;
367}
368
Mike Christie38e1a8f2008-12-02 00:32:12 -0600369static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600370{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600371 struct iscsi_conn *conn = task->conn;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600372 int rc;
373
Mike Christie38e1a8f2008-12-02 00:32:12 -0600374 while (iscsi_sw_tcp_xmit_qlen(conn)) {
375 rc = iscsi_sw_tcp_xmit(conn);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600376 if (rc == 0)
377 return -EAGAIN;
378 if (rc < 0)
379 return rc;
380 }
381
382 return 0;
383}
384
385/*
386 * This is called when we're done sending the header.
387 * Simply copy the data_segment to the send segment, and return.
388 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600389static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
390 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600391{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600392 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
393
394 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600395 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
396 "Header done. Next segment size %u total_size %u\n",
397 tcp_sw_conn->out.segment.size,
398 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600399 return 0;
400}
401
Mike Christie38e1a8f2008-12-02 00:32:12 -0600402static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
403 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600404{
405 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600406 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600407
Mike Christiec93f87c2009-03-05 14:46:00 -0600408 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
409 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600410
411 /* Clear the data segment - needs to be filled in by the
412 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600413 memset(&tcp_sw_conn->out.data_segment, 0,
414 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600415
416 /* If header digest is enabled, compute the CRC and
417 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500418 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600419 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600420 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600421 if (conn->hdrdgst_en) {
Mike Christie38e1a8f2008-12-02 00:32:12 -0600422 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600423 hdr + hdrlen);
424 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500425 }
426
Olaf Kircha8ac6312007-12-13 12:43:35 -0600427 /* Remember header pointer for later, when we need
428 * to decide whether there's a payload to go along
429 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600430 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600431
Mike Christie38e1a8f2008-12-02 00:32:12 -0600432 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
433 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700434}
435
Olaf Kircha8ac6312007-12-13 12:43:35 -0600436/*
437 * Prepare the send buffer for the payload data.
438 * Padding and checksumming will all be taken care
439 * of by the iscsi_segment routines.
440 */
441static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600442iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
443 unsigned int count, unsigned int offset,
444 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700445{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600446 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600447 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600448 struct hash_desc *tx_hash = NULL;
449 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700450
Mike Christiec93f87c2009-03-05 14:46:00 -0600451 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
452 conn->datadgst_en ?
453 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700454
Olaf Kircha8ac6312007-12-13 12:43:35 -0600455 /* Make sure the datalen matches what the caller
456 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600457 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600458 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700459
Olaf Kircha8ac6312007-12-13 12:43:35 -0600460 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600461 tx_hash = &tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600462
Mike Christie38e1a8f2008-12-02 00:32:12 -0600463 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
464 sg, count, offset, len,
465 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700466}
467
Olaf Kircha8ac6312007-12-13 12:43:35 -0600468static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600469iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600470 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700471{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600472 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600473 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600474 struct hash_desc *tx_hash = NULL;
475 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700476
Mike Christiec93f87c2009-03-05 14:46:00 -0600477 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
478 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700479
Olaf Kircha8ac6312007-12-13 12:43:35 -0600480 /* Make sure the datalen matches what the caller
481 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600482 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600483 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700484
Olaf Kircha8ac6312007-12-13 12:43:35 -0600485 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600486 tx_hash = &tcp_sw_conn->tx_hash;
Alex Aizman7ba24712005-08-04 19:30:08 -0700487
Mike Christie38e1a8f2008-12-02 00:32:12 -0600488 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600489 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700490}
491
Mike Christie38e1a8f2008-12-02 00:32:12 -0600492static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
493 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600494{
495 struct iscsi_conn *conn = task->conn;
496 int err = 0;
497
Mike Christie38e1a8f2008-12-02 00:32:12 -0600498 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600499
500 if (!count)
501 return 0;
502
503 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600504 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600505 else {
506 struct scsi_data_buffer *sdb = scsi_out(task->sc);
507
Mike Christie38e1a8f2008-12-02 00:32:12 -0600508 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
509 sdb->table.nents, offset,
510 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600511 }
512
513 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500514 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600515 return -EIO;
516 }
517 return 0;
518}
519
Mike Christie2ff79d52008-12-02 00:32:14 -0600520static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600521{
522 struct iscsi_tcp_task *tcp_task = task->dd_data;
523
Mike Christie38e1a8f2008-12-02 00:32:12 -0600524 task->hdr = task->dd_data + sizeof(*tcp_task);
525 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600526 return 0;
527}
528
Mike Christie7b8631b2006-01-13 18:05:50 -0600529static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600530iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
531 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700532{
Mike Christie7b8631b2006-01-13 18:05:50 -0600533 struct iscsi_conn *conn;
534 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500535 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600536 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700537
Mike Christie38e1a8f2008-12-02 00:32:12 -0600538 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
539 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600540 if (!cls_conn)
541 return NULL;
542 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500543 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600544 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700545
Mike Christie38e1a8f2008-12-02 00:32:12 -0600546 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
547 CRYPTO_ALG_ASYNC);
548 tcp_sw_conn->tx_hash.flags = 0;
549 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500550 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400551
Mike Christie38e1a8f2008-12-02 00:32:12 -0600552 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
553 CRYPTO_ALG_ASYNC);
554 tcp_sw_conn->rx_hash.flags = 0;
555 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
Mike Christiedd8c0d92006-08-31 18:09:28 -0400556 goto free_tx_tfm;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600557 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400558
Mike Christie7b8631b2006-01-13 18:05:50 -0600559 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700560
Mike Christiedd8c0d92006-08-31 18:09:28 -0400561free_tx_tfm:
Mike Christie38e1a8f2008-12-02 00:32:12 -0600562 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500563free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600564 iscsi_conn_printk(KERN_ERR, conn,
565 "Could not create connection due to crc32c "
566 "loading error. Make sure the crc32c "
567 "module is built as a module or into the "
568 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600569 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600570 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700571}
572
Mike Christie38e1a8f2008-12-02 00:32:12 -0600573static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500574{
Mike Christie22236962007-05-30 12:57:24 -0500575 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500576 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600577 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
578 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500579
Mike Christie22236962007-05-30 12:57:24 -0500580 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500581 return;
582
Mike Christie22236962007-05-30 12:57:24 -0500583 sock_hold(sock->sk);
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500584 iscsi_sw_tcp_conn_restore_callbacks(conn);
Mike Christie22236962007-05-30 12:57:24 -0500585 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500586
Mike Christie22236962007-05-30 12:57:24 -0500587 spin_lock_bh(&session->lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600588 tcp_sw_conn->sock = NULL;
Mike Christie22236962007-05-30 12:57:24 -0500589 spin_unlock_bh(&session->lock);
590 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500591}
592
Mike Christie38e1a8f2008-12-02 00:32:12 -0600593static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700594{
Mike Christie7b8631b2006-01-13 18:05:50 -0600595 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500596 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600597 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700598
Mike Christie38e1a8f2008-12-02 00:32:12 -0600599 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700600
Mike Christie38e1a8f2008-12-02 00:32:12 -0600601 if (tcp_sw_conn->tx_hash.tfm)
602 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
603 if (tcp_sw_conn->rx_hash.tfm)
604 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -0700605
Mike Christie38e1a8f2008-12-02 00:32:12 -0600606 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700607}
608
Mike Christie38e1a8f2008-12-02 00:32:12 -0600609static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500610{
611 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500612 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600613 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christieb64e77f2010-02-10 16:51:47 -0600614 struct socket *sock = tcp_sw_conn->sock;
Mike Christie913e5bf2008-05-21 15:54:18 -0500615
616 /* userspace may have goofed up and not bound us */
Mike Christieb64e77f2010-02-10 16:51:47 -0600617 if (!sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500618 return;
Mike Christie1c834692006-07-24 15:47:26 -0500619
Mike Christie8c38a292010-05-21 18:24:16 -0500620 sock->sk->sk_err = EIO;
621 wake_up_interruptible(sk_sleep(sock->sk));
Mike Christieb64e77f2010-02-10 16:51:47 -0600622
Mike Christie03adb5f2011-06-24 15:11:54 -0500623 /* stop xmit side */
624 iscsi_suspend_tx(conn);
625
626 /* stop recv side and release socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600627 iscsi_sw_tcp_release_conn(conn);
Mike Christie03adb5f2011-06-24 15:11:54 -0500628
629 iscsi_conn_stop(cls_conn, flag);
Mike Christie1c834692006-07-24 15:47:26 -0500630}
631
Alex Aizman7ba24712005-08-04 19:30:08 -0700632static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600633iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
634 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
635 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700636{
Mike Christiea79af8a2011-02-16 15:04:36 -0600637 struct iscsi_session *session = cls_session->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500638 struct iscsi_conn *conn = cls_conn->dd_data;
639 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600640 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700641 struct sock *sk;
642 struct socket *sock;
643 int err;
644
645 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500646 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700647 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600648 iscsi_conn_printk(KERN_ERR, conn,
649 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700650 return -EEXIST;
651 }
652
Mike Christie5bb0b552006-04-06 21:26:46 -0500653 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
654 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500655 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700656
Mike Christiea79af8a2011-02-16 15:04:36 -0600657 spin_lock_bh(&session->lock);
Mike Christie67a61112006-05-30 00:37:20 -0500658 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600659 tcp_sw_conn->sock = sock;
Mike Christiea79af8a2011-02-16 15:04:36 -0600660 spin_unlock_bh(&session->lock);
Alex Aizman7ba24712005-08-04 19:30:08 -0700661
Mike Christie67a61112006-05-30 00:37:20 -0500662 /* setup Socket parameters */
663 sk = sock->sk;
664 sk->sk_reuse = 1;
665 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
666 sk->sk_allocation = GFP_ATOMIC;
Alex Aizman7ba24712005-08-04 19:30:08 -0700667
Mike Christie38e1a8f2008-12-02 00:32:12 -0600668 iscsi_sw_tcp_conn_set_callbacks(conn);
669 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500670 /*
671 * set receive state machine into initial state
672 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600673 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700674 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500675
676free_socket:
677 sockfd_put(sock);
678 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700679}
680
Mike Christie38e1a8f2008-12-02 00:32:12 -0600681static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
682 enum iscsi_param param, char *buf,
683 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700684{
Mike Christie7b7232f2006-02-01 21:06:49 -0600685 struct iscsi_conn *conn = cls_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700686 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500687 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600688 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500689 int value;
Alex Aizman7ba24712005-08-04 19:30:08 -0700690
Alex Aizman7ba24712005-08-04 19:30:08 -0700691 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700692 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500693 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700694 break;
695 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500696 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600697 tcp_sw_conn->sendpage = conn->datadgst_en ?
698 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700699 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700700 case ISCSI_PARAM_MAX_R2T:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500701 sscanf(buf, "%d", &value);
Mike Christiedf93ffc2007-12-13 12:43:42 -0600702 if (value <= 0 || !is_power_of_2(value))
703 return -EINVAL;
704 if (session->max_r2t == value)
Alex Aizman7ba24712005-08-04 19:30:08 -0700705 break;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600706 iscsi_tcp_r2tpool_free(session);
Mike Christie5c75b7f2006-06-28 12:00:26 -0500707 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600708 if (iscsi_tcp_r2tpool_alloc(session))
Alex Aizman7ba24712005-08-04 19:30:08 -0700709 return -ENOMEM;
710 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700711 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500712 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700713 }
714
715 return 0;
716}
717
Mike Christie38e1a8f2008-12-02 00:32:12 -0600718static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
719 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600720{
Mike Christie7b7232f2006-02-01 21:06:49 -0600721 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600722 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
723 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
724 struct sockaddr_in6 addr;
725 int rc, len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600726
727 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500728 case ISCSI_PARAM_CONN_PORT:
Mike Christiefd7255f2006-04-06 21:13:36 -0500729 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie22236962007-05-30 12:57:24 -0500730 spin_lock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600731 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
732 spin_unlock_bh(&conn->session->lock);
733 return -ENOTCONN;
734 }
735 rc = kernel_getpeername(tcp_sw_conn->sock,
736 (struct sockaddr *)&addr, &len);
Mike Christie22236962007-05-30 12:57:24 -0500737 spin_unlock_bh(&conn->session->lock);
Mike Christiea79af8a2011-02-16 15:04:36 -0600738 if (rc)
739 return rc;
740
741 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
742 &addr, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500743 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500744 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500745 }
746
Mike Christiea79af8a2011-02-16 15:04:36 -0600747 return 0;
748}
749
750static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
751 enum iscsi_host_param param, char *buf)
752{
753 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
754 struct iscsi_session *session = tcp_sw_host->session;
755 struct iscsi_conn *conn;
756 struct iscsi_tcp_conn *tcp_conn;
757 struct iscsi_sw_tcp_conn *tcp_sw_conn;
758 struct sockaddr_in6 addr;
759 int rc, len;
760
761 switch (param) {
762 case ISCSI_HOST_PARAM_IPADDRESS:
763 spin_lock_bh(&session->lock);
764 conn = session->leadconn;
765 if (!conn) {
766 spin_unlock_bh(&session->lock);
767 return -ENOTCONN;
768 }
769 tcp_conn = conn->dd_data;
770
771 tcp_sw_conn = tcp_conn->dd_data;
772 if (!tcp_sw_conn->sock) {
773 spin_unlock_bh(&session->lock);
774 return -ENOTCONN;
775 }
776
777 rc = kernel_getsockname(tcp_sw_conn->sock,
778 (struct sockaddr *)&addr, &len);
779 spin_unlock_bh(&session->lock);
780 if (rc)
781 return rc;
782
783 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
784 &addr, param, buf);
785 default:
786 return iscsi_host_get_param(shost, param, buf);
787 }
788
789 return 0;
Mike Christiefd7255f2006-04-06 21:13:36 -0500790}
791
Alex Aizman7ba24712005-08-04 19:30:08 -0700792static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600793iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
794 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700795{
Mike Christie7b7232f2006-02-01 21:06:49 -0600796 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500797 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600798 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700799
Alex Aizman7ba24712005-08-04 19:30:08 -0700800 stats->custom_length = 3;
801 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600802 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700803 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600804 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700805 strcpy(stats->custom[2].desc, "eh_abort_cnt");
806 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600807
808 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700809}
810
Mike Christie5bb0b552006-04-06 21:26:46 -0500811static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600812iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600813 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700814{
Mike Christie5bb0b552006-04-06 21:26:46 -0500815 struct iscsi_cls_session *cls_session;
816 struct iscsi_session *session;
Mike Christiea79af8a2011-02-16 15:04:36 -0600817 struct iscsi_sw_tcp_host *tcp_sw_host;
Mike Christie06520ede2008-05-21 15:54:15 -0500818 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700819
Mike Christie06520ede2008-05-21 15:54:15 -0500820 if (ep) {
821 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500822 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500823 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700824
Mike Christiea79af8a2011-02-16 15:04:36 -0600825 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
826 sizeof(struct iscsi_sw_tcp_host), 1);
Mike Christie75613522008-05-21 15:53:59 -0500827 if (!shost)
828 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600829 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600830 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500831 shost->max_lun = iscsi_max_lun;
832 shost->max_id = 0;
833 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300834 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500835
Mike Christiea4804cd2008-05-21 15:54:00 -0500836 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500837 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500838
Mike Christie38e1a8f2008-12-02 00:32:12 -0600839 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530840 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600841 sizeof(struct iscsi_tcp_task) +
842 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500843 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500844 if (!cls_session)
845 goto remove_host;
846 session = cls_session->dd_data;
Mike Christiea79af8a2011-02-16 15:04:36 -0600847 tcp_sw_host = iscsi_host_priv(shost);
848 tcp_sw_host->session = session;
Mike Christie75613522008-05-21 15:53:59 -0500849
Mike Christiefbc514b2008-05-21 15:54:07 -0500850 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600851 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500852 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500853 return cls_session;
854
Mike Christie75613522008-05-21 15:53:59 -0500855remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500856 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500857remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500858 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500859free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500860 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500861 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700862}
863
Mike Christie38e1a8f2008-12-02 00:32:12 -0600864static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500865{
Mike Christie75613522008-05-21 15:53:59 -0500866 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
867
Mike Christie38e1a8f2008-12-02 00:32:12 -0600868 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500869 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500870
Mike Christiea4804cd2008-05-21 15:54:00 -0500871 iscsi_host_remove(shost);
872 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500873}
874
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600875static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
876{
877 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
878 return 0;
879}
880
Mike Christie38e1a8f2008-12-02 00:32:12 -0600881static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500882{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500883 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500884 blk_queue_dma_alignment(sdev->request_queue, 0);
885 return 0;
886}
887
Mike Christie38e1a8f2008-12-02 00:32:12 -0600888static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500889 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500890 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500891 .queuecommand = iscsi_queuecommand,
892 .change_queue_depth = iscsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500893 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600894 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600895 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500896 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
897 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600898 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530899 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie5bb0b552006-04-06 21:26:46 -0500900 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600901 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600902 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500903 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500904 .proc_name = "iscsi_tcp",
905 .this_id = -1,
906};
907
Mike Christie38e1a8f2008-12-02 00:32:12 -0600908static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700909 .owner = THIS_MODULE,
910 .name = "tcp",
911 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
912 | CAP_DATADGST,
Mike Christiefd7255f2006-04-06 21:13:36 -0500913 .param_mask = ISCSI_MAX_RECV_DLENGTH |
914 ISCSI_MAX_XMIT_DLENGTH |
915 ISCSI_HDRDGST_EN |
916 ISCSI_DATADGST_EN |
917 ISCSI_INITIAL_R2T_EN |
918 ISCSI_MAX_R2T |
919 ISCSI_IMM_DATA_EN |
920 ISCSI_FIRST_BURST |
921 ISCSI_MAX_BURST |
922 ISCSI_PDU_INORDER_EN |
923 ISCSI_DATASEQ_INORDER_EN |
924 ISCSI_ERL |
925 ISCSI_CONN_PORT |
Mike Christie8d2860b2006-05-02 19:46:47 -0500926 ISCSI_CONN_ADDRESS |
Mike Christie5c75b7f2006-06-28 12:00:26 -0500927 ISCSI_EXP_STATSN |
928 ISCSI_PERSISTENT_PORT |
929 ISCSI_PERSISTENT_ADDRESS |
Mike Christieb2c64162007-05-30 12:57:16 -0500930 ISCSI_TARGET_NAME | ISCSI_TPGT |
931 ISCSI_USERNAME | ISCSI_PASSWORD |
Mike Christie843c0a82007-12-13 12:43:20 -0600932 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
Mike Christief6d51802007-12-13 12:43:30 -0600933 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
Mike Christie3fe5ae82009-11-11 16:34:33 -0600934 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
Mike Christie88dfd342008-05-21 15:54:16 -0500935 ISCSI_PING_TMO | ISCSI_RECV_TMO |
936 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
Mike Christie22236962007-05-30 12:57:24 -0500937 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
Mike Christied8196ed2007-05-30 12:57:25 -0500938 ISCSI_HOST_INITIATOR_NAME |
939 ISCSI_HOST_NETDEV_NAME,
Mike Christie5bb0b552006-04-06 21:26:46 -0500940 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600941 .create_session = iscsi_sw_tcp_session_create,
942 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500943 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600944 .create_conn = iscsi_sw_tcp_conn_create,
945 .bind_conn = iscsi_sw_tcp_conn_bind,
946 .destroy_conn = iscsi_sw_tcp_conn_destroy,
947 .set_param = iscsi_sw_tcp_conn_set_param,
948 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600949 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -0700950 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600951 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500952 /* iscsi host params */
Mike Christiea79af8a2011-02-16 15:04:36 -0600953 .get_host_param = iscsi_sw_tcp_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -0500954 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -0500955 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -0700956 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600957 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600958 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -0500959 .init_task = iscsi_tcp_task_init,
960 .xmit_task = iscsi_tcp_task_xmit,
961 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600962 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600963 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
964 .init_pdu = iscsi_sw_tcp_pdu_init,
965 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500966 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -0500967 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -0700968};
969
Mike Christie38e1a8f2008-12-02 00:32:12 -0600970static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700971{
Alex Aizman7ba24712005-08-04 19:30:08 -0700972 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -0500973 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
974 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -0700975 return -EINVAL;
976 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700977
Mike Christie38e1a8f2008-12-02 00:32:12 -0600978 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
979 &iscsi_sw_tcp_transport);
980 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -0500981 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -0700982
Mike Christie7b8631b2006-01-13 18:05:50 -0600983 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700984}
985
Mike Christie38e1a8f2008-12-02 00:32:12 -0600986static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700987{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600988 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -0700989}
990
Mike Christie38e1a8f2008-12-02 00:32:12 -0600991module_init(iscsi_sw_tcp_init);
992module_exit(iscsi_sw_tcp_exit);