blob: fec47de72535984f1e36b83048f763e7cd0a15a8 [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.
110 */
111static inline int iscsi_sw_sk_state_check(struct sock *sk)
112{
Mike Christied1af8a32009-08-20 15:11:02 -0500113 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500114
Mike Christied1af8a32009-08-20 15:11:02 -0500115 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
116 !atomic_read(&sk->sk_rmem_alloc)) {
117 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
118 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
119 return -ECONNRESET;
120 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500121 return 0;
122}
123
Mike Christie38e1a8f2008-12-02 00:32:12 -0600124static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600125{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600126 struct iscsi_conn *conn = sk->sk_user_data;
127 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
128 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700129
Mike Christie38e1a8f2008-12-02 00:32:12 -0600130 read_lock(&sk->sk_callback_lock);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600131
132 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600133 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
134 * We set count to 1 because we want the network layer to
135 * hand us all the skbs that are available. iscsi_tcp_recv
136 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600137 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600138 rd_desc.arg.data = conn;
139 rd_desc.count = 1;
140 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600141
Mike Christied1af8a32009-08-20 15:11:02 -0500142 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500143
Mike Christie38e1a8f2008-12-02 00:32:12 -0600144 read_unlock(&sk->sk_callback_lock);
145
146 /* If we had to (atomically) map a highmem page,
147 * unmap it now. */
148 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600149}
Alex Aizman7ba24712005-08-04 19:30:08 -0700150
Mike Christie38e1a8f2008-12-02 00:32:12 -0600151static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600152{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600153 struct iscsi_tcp_conn *tcp_conn;
154 struct iscsi_sw_tcp_conn *tcp_sw_conn;
155 struct iscsi_conn *conn;
156 struct iscsi_session *session;
157 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600158
Mike Christie38e1a8f2008-12-02 00:32:12 -0600159 read_lock(&sk->sk_callback_lock);
160
161 conn = (struct iscsi_conn*)sk->sk_user_data;
162 session = conn->session;
163
Mike Christied1af8a32009-08-20 15:11:02 -0500164 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700165
Mike Christie38e1a8f2008-12-02 00:32:12 -0600166 tcp_conn = conn->dd_data;
167 tcp_sw_conn = tcp_conn->dd_data;
168 old_state_change = tcp_sw_conn->old_state_change;
169
170 read_unlock(&sk->sk_callback_lock);
171
172 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600173}
Alex Aizman7ba24712005-08-04 19:30:08 -0700174
Olaf Kirchda32dd62007-12-13 12:43:21 -0600175/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600176 * iscsi_write_space - Called when more output buffer space is available
177 * @sk: socket space is available for
178 **/
179static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600180{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600181 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
182 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
183 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600184
Mike Christie38e1a8f2008-12-02 00:32:12 -0600185 tcp_sw_conn->old_write_space(sk);
Mike Christiec93f87c2009-03-05 14:46:00 -0600186 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600187 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600188}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600189
Mike Christie38e1a8f2008-12-02 00:32:12 -0600190static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
191{
192 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
193 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
194 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600195
Mike Christie38e1a8f2008-12-02 00:32:12 -0600196 /* assign new callbacks */
197 write_lock_bh(&sk->sk_callback_lock);
198 sk->sk_user_data = conn;
199 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
200 tcp_sw_conn->old_state_change = sk->sk_state_change;
201 tcp_sw_conn->old_write_space = sk->sk_write_space;
202 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
203 sk->sk_state_change = iscsi_sw_tcp_state_change;
204 sk->sk_write_space = iscsi_sw_tcp_write_space;
205 write_unlock_bh(&sk->sk_callback_lock);
206}
Alex Aizman7ba24712005-08-04 19:30:08 -0700207
Mike Christie38e1a8f2008-12-02 00:32:12 -0600208static void
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500209iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600210{
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500211 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
212 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600213 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600214
Mike Christie38e1a8f2008-12-02 00:32:12 -0600215 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
216 write_lock_bh(&sk->sk_callback_lock);
217 sk->sk_user_data = NULL;
218 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
219 sk->sk_state_change = tcp_sw_conn->old_state_change;
220 sk->sk_write_space = tcp_sw_conn->old_write_space;
221 sk->sk_no_check = 0;
222 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600223}
224
225/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600226 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600227 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600228 * @segment: the buffer to transmnit
229 *
230 * This function transmits as much of the buffer as
231 * the network layer will accept, and returns the number of
232 * bytes transmitted.
233 *
234 * If CRC hashing is enabled, the function will compute the
235 * hash as it goes. When the entire segment has been transmitted,
236 * it will retrieve the hash value and send it as well.
237 */
Mike Christie6df19a72008-12-02 00:32:16 -0600238static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600239 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600240{
Mike Christie6df19a72008-12-02 00:32:16 -0600241 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600242 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600243 unsigned int copied = 0;
244 int r = 0;
245
Mike Christie6df19a72008-12-02 00:32:16 -0600246 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600247 struct scatterlist *sg;
248 unsigned int offset, copy;
249 int flags = 0;
250
251 r = 0;
252 offset = segment->copied;
253 copy = segment->size - offset;
254
255 if (segment->total_copied + segment->size < segment->total_size)
256 flags |= MSG_MORE;
257
258 /* Use sendpage if we can; else fall back to sendmsg */
259 if (!segment->data) {
260 sg = segment->sg;
261 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600262 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
263 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600264 } else {
265 struct msghdr msg = { .msg_flags = flags };
266 struct kvec iov = {
267 .iov_base = segment->data + offset,
268 .iov_len = copy
269 };
270
271 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
272 }
273
274 if (r < 0) {
275 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600276 return r;
277 }
278 copied += r;
279 }
280 return copied;
281}
282
283/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600284 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700285 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600286static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700287{
Mike Christie5bb0b552006-04-06 21:26:46 -0500288 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600289 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
290 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600291 unsigned int consumed = 0;
292 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700293
Olaf Kircha8ac6312007-12-13 12:43:35 -0600294 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600295 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500296 /*
297 * We may not have been able to send data because the conn
298 * is getting stopped. libiscsi will know so propogate err
299 * for it to do the right thing.
300 */
301 if (rc == -EAGAIN)
302 return rc;
303 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500304 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600305 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500306 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600307 break;
308
309 consumed += rc;
310
311 if (segment->total_copied >= segment->total_size) {
312 if (segment->done != NULL) {
313 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500314 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600315 goto error;
316 }
317 }
318 }
319
Mike Christiec93f87c2009-03-05 14:46:00 -0600320 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600321
322 conn->txdata_octets += consumed;
323 return consumed;
324
325error:
326 /* Transmit error. We could initiate error recovery
327 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600328 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500329 iscsi_conn_failure(conn, rc);
330 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600331}
332
333/**
334 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
335 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600336static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600337{
338 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600339 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
340 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600341
342 return segment->total_copied - segment->total_size;
343}
344
Mike Christie38e1a8f2008-12-02 00:32:12 -0600345static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600346{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600347 struct iscsi_conn *conn = task->conn;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600348 int rc;
349
Mike Christie38e1a8f2008-12-02 00:32:12 -0600350 while (iscsi_sw_tcp_xmit_qlen(conn)) {
351 rc = iscsi_sw_tcp_xmit(conn);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600352 if (rc == 0)
353 return -EAGAIN;
354 if (rc < 0)
355 return rc;
356 }
357
358 return 0;
359}
360
361/*
362 * This is called when we're done sending the header.
363 * Simply copy the data_segment to the send segment, and return.
364 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600365static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
366 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600367{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600368 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
369
370 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600371 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
372 "Header done. Next segment size %u total_size %u\n",
373 tcp_sw_conn->out.segment.size,
374 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600375 return 0;
376}
377
Mike Christie38e1a8f2008-12-02 00:32:12 -0600378static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
379 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600380{
381 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600382 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600383
Mike Christiec93f87c2009-03-05 14:46:00 -0600384 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
385 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600386
387 /* Clear the data segment - needs to be filled in by the
388 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600389 memset(&tcp_sw_conn->out.data_segment, 0,
390 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600391
392 /* If header digest is enabled, compute the CRC and
393 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500394 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600395 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600396 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600397 if (conn->hdrdgst_en) {
Mike Christie38e1a8f2008-12-02 00:32:12 -0600398 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600399 hdr + hdrlen);
400 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500401 }
402
Olaf Kircha8ac6312007-12-13 12:43:35 -0600403 /* Remember header pointer for later, when we need
404 * to decide whether there's a payload to go along
405 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600406 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600407
Mike Christie38e1a8f2008-12-02 00:32:12 -0600408 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
409 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700410}
411
Olaf Kircha8ac6312007-12-13 12:43:35 -0600412/*
413 * Prepare the send buffer for the payload data.
414 * Padding and checksumming will all be taken care
415 * of by the iscsi_segment routines.
416 */
417static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600418iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
419 unsigned int count, unsigned int offset,
420 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700421{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600422 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600423 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600424 struct hash_desc *tx_hash = NULL;
425 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700426
Mike Christiec93f87c2009-03-05 14:46:00 -0600427 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
428 conn->datadgst_en ?
429 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700430
Olaf Kircha8ac6312007-12-13 12:43:35 -0600431 /* Make sure the datalen matches what the caller
432 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600433 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600434 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700435
Olaf Kircha8ac6312007-12-13 12:43:35 -0600436 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600437 tx_hash = &tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600438
Mike Christie38e1a8f2008-12-02 00:32:12 -0600439 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
440 sg, count, offset, len,
441 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700442}
443
Olaf Kircha8ac6312007-12-13 12:43:35 -0600444static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600445iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600446 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700447{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600448 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600449 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600450 struct hash_desc *tx_hash = NULL;
451 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700452
Mike Christiec93f87c2009-03-05 14:46:00 -0600453 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, 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;
Alex Aizman7ba24712005-08-04 19:30:08 -0700463
Mike Christie38e1a8f2008-12-02 00:32:12 -0600464 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600465 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700466}
467
Mike Christie38e1a8f2008-12-02 00:32:12 -0600468static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
469 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600470{
471 struct iscsi_conn *conn = task->conn;
472 int err = 0;
473
Mike Christie38e1a8f2008-12-02 00:32:12 -0600474 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600475
476 if (!count)
477 return 0;
478
479 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600480 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600481 else {
482 struct scsi_data_buffer *sdb = scsi_out(task->sc);
483
Mike Christie38e1a8f2008-12-02 00:32:12 -0600484 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
485 sdb->table.nents, offset,
486 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600487 }
488
489 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500490 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600491 return -EIO;
492 }
493 return 0;
494}
495
Mike Christie2ff79d52008-12-02 00:32:14 -0600496static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600497{
498 struct iscsi_tcp_task *tcp_task = task->dd_data;
499
Mike Christie38e1a8f2008-12-02 00:32:12 -0600500 task->hdr = task->dd_data + sizeof(*tcp_task);
501 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600502 return 0;
503}
504
Mike Christie7b8631b2006-01-13 18:05:50 -0600505static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600506iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
507 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700508{
Mike Christie7b8631b2006-01-13 18:05:50 -0600509 struct iscsi_conn *conn;
510 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500511 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600512 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700513
Mike Christie38e1a8f2008-12-02 00:32:12 -0600514 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
515 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600516 if (!cls_conn)
517 return NULL;
518 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500519 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600520 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700521
Mike Christie38e1a8f2008-12-02 00:32:12 -0600522 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
523 CRYPTO_ALG_ASYNC);
524 tcp_sw_conn->tx_hash.flags = 0;
525 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500526 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400527
Mike Christie38e1a8f2008-12-02 00:32:12 -0600528 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
529 CRYPTO_ALG_ASYNC);
530 tcp_sw_conn->rx_hash.flags = 0;
531 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
Mike Christiedd8c0d92006-08-31 18:09:28 -0400532 goto free_tx_tfm;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600533 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400534
Mike Christie7b8631b2006-01-13 18:05:50 -0600535 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700536
Mike Christiedd8c0d92006-08-31 18:09:28 -0400537free_tx_tfm:
Mike Christie38e1a8f2008-12-02 00:32:12 -0600538 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500539free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600540 iscsi_conn_printk(KERN_ERR, conn,
541 "Could not create connection due to crc32c "
542 "loading error. Make sure the crc32c "
543 "module is built as a module or into the "
544 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600545 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600546 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700547}
548
Mike Christie38e1a8f2008-12-02 00:32:12 -0600549static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500550{
Mike Christie22236962007-05-30 12:57:24 -0500551 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500552 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600553 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
554 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500555
Mike Christie22236962007-05-30 12:57:24 -0500556 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500557 return;
558
Mike Christie22236962007-05-30 12:57:24 -0500559 sock_hold(sock->sk);
Avi Kaplanc484a50a2010-04-09 22:07:38 -0500560 iscsi_sw_tcp_conn_restore_callbacks(conn);
Mike Christie22236962007-05-30 12:57:24 -0500561 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500562
Mike Christie22236962007-05-30 12:57:24 -0500563 spin_lock_bh(&session->lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600564 tcp_sw_conn->sock = NULL;
Mike Christie22236962007-05-30 12:57:24 -0500565 spin_unlock_bh(&session->lock);
566 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500567}
568
Mike Christie38e1a8f2008-12-02 00:32:12 -0600569static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700570{
Mike Christie7b8631b2006-01-13 18:05:50 -0600571 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500572 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600573 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700574
Mike Christie38e1a8f2008-12-02 00:32:12 -0600575 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700576
Mike Christie38e1a8f2008-12-02 00:32:12 -0600577 if (tcp_sw_conn->tx_hash.tfm)
578 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
579 if (tcp_sw_conn->rx_hash.tfm)
580 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -0700581
Mike Christie38e1a8f2008-12-02 00:32:12 -0600582 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700583}
584
Mike Christie38e1a8f2008-12-02 00:32:12 -0600585static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500586{
587 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500588 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600589 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christieb64e77f2010-02-10 16:51:47 -0600590 struct socket *sock = tcp_sw_conn->sock;
Mike Christie913e5bf2008-05-21 15:54:18 -0500591
592 /* userspace may have goofed up and not bound us */
Mike Christieb64e77f2010-02-10 16:51:47 -0600593 if (!sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500594 return;
595 /*
596 * Make sure our recv side is stopped.
597 * Older tools called conn stop before ep_disconnect
598 * so IO could still be coming in.
599 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600600 write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
Mike Christie913e5bf2008-05-21 15:54:18 -0500601 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600602 write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
Mike Christie1c834692006-07-24 15:47:26 -0500603
Mike Christie8c38a292010-05-21 18:24:16 -0500604 sock->sk->sk_err = EIO;
605 wake_up_interruptible(sk_sleep(sock->sk));
Mike Christieb64e77f2010-02-10 16:51:47 -0600606
Mike Christie1c834692006-07-24 15:47:26 -0500607 iscsi_conn_stop(cls_conn, flag);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600608 iscsi_sw_tcp_release_conn(conn);
Mike Christie1c834692006-07-24 15:47:26 -0500609}
610
Mike Christie38e1a8f2008-12-02 00:32:12 -0600611static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
612 char *buf, int *port,
613 int (*getname)(struct socket *,
614 struct sockaddr *,
615 int *addrlen))
Mike Christie22236962007-05-30 12:57:24 -0500616{
617 struct sockaddr_storage *addr;
618 struct sockaddr_in6 *sin6;
619 struct sockaddr_in *sin;
620 int rc = 0, len;
621
Al Viroa9204872007-07-20 16:03:40 +0100622 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
Mike Christie22236962007-05-30 12:57:24 -0500623 if (!addr)
624 return -ENOMEM;
625
626 if (getname(sock, (struct sockaddr *) addr, &len)) {
627 rc = -ENODEV;
628 goto free_addr;
629 }
630
631 switch (addr->ss_family) {
632 case AF_INET:
633 sin = (struct sockaddr_in *)addr;
634 spin_lock_bh(&conn->session->lock);
Harvey Harrison63779432008-10-31 00:56:00 -0700635 sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
Mike Christie22236962007-05-30 12:57:24 -0500636 *port = be16_to_cpu(sin->sin_port);
637 spin_unlock_bh(&conn->session->lock);
638 break;
639 case AF_INET6:
640 sin6 = (struct sockaddr_in6 *)addr;
641 spin_lock_bh(&conn->session->lock);
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700642 sprintf(buf, "%pI6", &sin6->sin6_addr);
Mike Christie22236962007-05-30 12:57:24 -0500643 *port = be16_to_cpu(sin6->sin6_port);
644 spin_unlock_bh(&conn->session->lock);
645 break;
646 }
647free_addr:
648 kfree(addr);
649 return rc;
650}
651
Alex Aizman7ba24712005-08-04 19:30:08 -0700652static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600653iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
654 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
655 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700656{
Mike Christie75613522008-05-21 15:53:59 -0500657 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
658 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500659 struct iscsi_conn *conn = cls_conn->dd_data;
660 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600661 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700662 struct sock *sk;
663 struct socket *sock;
664 int err;
665
666 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500667 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700668 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600669 iscsi_conn_printk(KERN_ERR, conn,
670 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700671 return -EEXIST;
672 }
Mike Christie22236962007-05-30 12:57:24 -0500673 /*
674 * copy these values now because if we drop the session
675 * userspace may still want to query the values since we will
676 * be using them for the reconnect
677 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600678 err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
679 &conn->portal_port, kernel_getpeername);
Mike Christie22236962007-05-30 12:57:24 -0500680 if (err)
681 goto free_socket;
682
Mike Christie38e1a8f2008-12-02 00:32:12 -0600683 err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
684 &ihost->local_port, kernel_getsockname);
Mike Christie22236962007-05-30 12:57:24 -0500685 if (err)
686 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700687
Mike Christie5bb0b552006-04-06 21:26:46 -0500688 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
689 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500690 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700691
Mike Christie67a61112006-05-30 00:37:20 -0500692 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600693 tcp_sw_conn->sock = sock;
Alex Aizman7ba24712005-08-04 19:30:08 -0700694
Mike Christie67a61112006-05-30 00:37:20 -0500695 /* setup Socket parameters */
696 sk = sock->sk;
697 sk->sk_reuse = 1;
698 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
699 sk->sk_allocation = GFP_ATOMIC;
Alex Aizman7ba24712005-08-04 19:30:08 -0700700
Mike Christie38e1a8f2008-12-02 00:32:12 -0600701 iscsi_sw_tcp_conn_set_callbacks(conn);
702 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500703 /*
704 * set receive state machine into initial state
705 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600706 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700707 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500708
709free_socket:
710 sockfd_put(sock);
711 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700712}
713
Mike Christie38e1a8f2008-12-02 00:32:12 -0600714static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
715 enum iscsi_param param, char *buf,
716 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700717{
Mike Christie7b7232f2006-02-01 21:06:49 -0600718 struct iscsi_conn *conn = cls_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700719 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500720 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600721 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500722 int value;
Alex Aizman7ba24712005-08-04 19:30:08 -0700723
Alex Aizman7ba24712005-08-04 19:30:08 -0700724 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700725 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500726 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700727 break;
728 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500729 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600730 tcp_sw_conn->sendpage = conn->datadgst_en ?
731 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700732 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700733 case ISCSI_PARAM_MAX_R2T:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500734 sscanf(buf, "%d", &value);
Mike Christiedf93ffc2007-12-13 12:43:42 -0600735 if (value <= 0 || !is_power_of_2(value))
736 return -EINVAL;
737 if (session->max_r2t == value)
Alex Aizman7ba24712005-08-04 19:30:08 -0700738 break;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600739 iscsi_tcp_r2tpool_free(session);
Mike Christie5c75b7f2006-06-28 12:00:26 -0500740 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600741 if (iscsi_tcp_r2tpool_alloc(session))
Alex Aizman7ba24712005-08-04 19:30:08 -0700742 return -ENOMEM;
743 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700744 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500745 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700746 }
747
748 return 0;
749}
750
Mike Christie38e1a8f2008-12-02 00:32:12 -0600751static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
752 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600753{
Mike Christie7b7232f2006-02-01 21:06:49 -0600754 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500755 int len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600756
757 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500758 case ISCSI_PARAM_CONN_PORT:
Mike Christie22236962007-05-30 12:57:24 -0500759 spin_lock_bh(&conn->session->lock);
760 len = sprintf(buf, "%hu\n", conn->portal_port);
761 spin_unlock_bh(&conn->session->lock);
Mike Christie8d2860b2006-05-02 19:46:47 -0500762 break;
Mike Christiefd7255f2006-04-06 21:13:36 -0500763 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie22236962007-05-30 12:57:24 -0500764 spin_lock_bh(&conn->session->lock);
765 len = sprintf(buf, "%s\n", conn->portal_address);
766 spin_unlock_bh(&conn->session->lock);
Mike Christiefd7255f2006-04-06 21:13:36 -0500767 break;
768 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500769 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500770 }
771
772 return len;
773}
774
Alex Aizman7ba24712005-08-04 19:30:08 -0700775static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600776iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
777 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700778{
Mike Christie7b7232f2006-02-01 21:06:49 -0600779 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500780 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600781 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700782
Alex Aizman7ba24712005-08-04 19:30:08 -0700783 stats->custom_length = 3;
784 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600785 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700786 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600787 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700788 strcpy(stats->custom[2].desc, "eh_abort_cnt");
789 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600790
791 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700792}
793
Mike Christie5bb0b552006-04-06 21:26:46 -0500794static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600795iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600796 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700797{
Mike Christie5bb0b552006-04-06 21:26:46 -0500798 struct iscsi_cls_session *cls_session;
799 struct iscsi_session *session;
Mike Christie06520ede2008-05-21 15:54:15 -0500800 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700801
Mike Christie06520ede2008-05-21 15:54:15 -0500802 if (ep) {
803 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500804 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500805 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700806
Mike Christie4d108352009-03-05 14:46:04 -0600807 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1);
Mike Christie75613522008-05-21 15:53:59 -0500808 if (!shost)
809 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600810 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600811 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500812 shost->max_lun = iscsi_max_lun;
813 shost->max_id = 0;
814 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300815 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500816
Mike Christiea4804cd2008-05-21 15:54:00 -0500817 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500818 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500819
Mike Christie38e1a8f2008-12-02 00:32:12 -0600820 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530821 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600822 sizeof(struct iscsi_tcp_task) +
823 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500824 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500825 if (!cls_session)
826 goto remove_host;
827 session = cls_session->dd_data;
828
Mike Christiefbc514b2008-05-21 15:54:07 -0500829 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600830 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500831 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500832 return cls_session;
833
Mike Christie75613522008-05-21 15:53:59 -0500834remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500835 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500836remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500837 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500838free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500839 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500840 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700841}
842
Mike Christie38e1a8f2008-12-02 00:32:12 -0600843static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500844{
Mike Christie75613522008-05-21 15:53:59 -0500845 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
846
Mike Christie38e1a8f2008-12-02 00:32:12 -0600847 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500848 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500849
Mike Christiea4804cd2008-05-21 15:54:00 -0500850 iscsi_host_remove(shost);
851 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500852}
853
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600854static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
855{
856 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
857 return 0;
858}
859
Mike Christie38e1a8f2008-12-02 00:32:12 -0600860static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500861{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500862 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500863 blk_queue_dma_alignment(sdev->request_queue, 0);
864 return 0;
865}
866
Mike Christie38e1a8f2008-12-02 00:32:12 -0600867static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500868 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500869 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500870 .queuecommand = iscsi_queuecommand,
871 .change_queue_depth = iscsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500872 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600873 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600874 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500875 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
876 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600877 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530878 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie5bb0b552006-04-06 21:26:46 -0500879 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600880 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600881 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500882 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500883 .proc_name = "iscsi_tcp",
884 .this_id = -1,
885};
886
Mike Christie38e1a8f2008-12-02 00:32:12 -0600887static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700888 .owner = THIS_MODULE,
889 .name = "tcp",
890 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
891 | CAP_DATADGST,
Mike Christiefd7255f2006-04-06 21:13:36 -0500892 .param_mask = ISCSI_MAX_RECV_DLENGTH |
893 ISCSI_MAX_XMIT_DLENGTH |
894 ISCSI_HDRDGST_EN |
895 ISCSI_DATADGST_EN |
896 ISCSI_INITIAL_R2T_EN |
897 ISCSI_MAX_R2T |
898 ISCSI_IMM_DATA_EN |
899 ISCSI_FIRST_BURST |
900 ISCSI_MAX_BURST |
901 ISCSI_PDU_INORDER_EN |
902 ISCSI_DATASEQ_INORDER_EN |
903 ISCSI_ERL |
904 ISCSI_CONN_PORT |
Mike Christie8d2860b2006-05-02 19:46:47 -0500905 ISCSI_CONN_ADDRESS |
Mike Christie5c75b7f2006-06-28 12:00:26 -0500906 ISCSI_EXP_STATSN |
907 ISCSI_PERSISTENT_PORT |
908 ISCSI_PERSISTENT_ADDRESS |
Mike Christieb2c64162007-05-30 12:57:16 -0500909 ISCSI_TARGET_NAME | ISCSI_TPGT |
910 ISCSI_USERNAME | ISCSI_PASSWORD |
Mike Christie843c0a82007-12-13 12:43:20 -0600911 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
Mike Christief6d51802007-12-13 12:43:30 -0600912 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
Mike Christie3fe5ae82009-11-11 16:34:33 -0600913 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
Mike Christie88dfd342008-05-21 15:54:16 -0500914 ISCSI_PING_TMO | ISCSI_RECV_TMO |
915 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
Mike Christie22236962007-05-30 12:57:24 -0500916 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
Mike Christied8196ed2007-05-30 12:57:25 -0500917 ISCSI_HOST_INITIATOR_NAME |
918 ISCSI_HOST_NETDEV_NAME,
Mike Christie5bb0b552006-04-06 21:26:46 -0500919 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600920 .create_session = iscsi_sw_tcp_session_create,
921 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500922 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600923 .create_conn = iscsi_sw_tcp_conn_create,
924 .bind_conn = iscsi_sw_tcp_conn_bind,
925 .destroy_conn = iscsi_sw_tcp_conn_destroy,
926 .set_param = iscsi_sw_tcp_conn_set_param,
927 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600928 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -0700929 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600930 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500931 /* iscsi host params */
Mike Christie75613522008-05-21 15:53:59 -0500932 .get_host_param = iscsi_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -0500933 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -0500934 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -0700935 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600936 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600937 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -0500938 .init_task = iscsi_tcp_task_init,
939 .xmit_task = iscsi_tcp_task_xmit,
940 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600941 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600942 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
943 .init_pdu = iscsi_sw_tcp_pdu_init,
944 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500945 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -0500946 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -0700947};
948
Mike Christie38e1a8f2008-12-02 00:32:12 -0600949static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700950{
Alex Aizman7ba24712005-08-04 19:30:08 -0700951 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -0500952 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
953 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -0700954 return -EINVAL;
955 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700956
Mike Christie38e1a8f2008-12-02 00:32:12 -0600957 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
958 &iscsi_sw_tcp_transport);
959 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -0500960 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -0700961
Mike Christie7b8631b2006-01-13 18:05:50 -0600962 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700963}
964
Mike Christie38e1a8f2008-12-02 00:32:12 -0600965static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700966{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600967 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -0700968}
969
Mike Christie38e1a8f2008-12-02 00:32:12 -0600970module_init(iscsi_sw_tcp_init);
971module_exit(iscsi_sw_tcp_exit);