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Alex Aizman7ba24712005-08-04 19:30:08 -07001/*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
Mike Christie5bb0b552006-04-06 21:26:46 -05006 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
Alex Aizman7ba24712005-08-04 19:30:08 -07008 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * See the file COPYING included with this distribution for more details.
21 *
22 * Credits:
23 * Christoph Hellwig
24 * FUJITA Tomonori
25 * Arne Redlich
26 * Zhenyu Wang
27 */
28
29#include <linux/types.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070030#include <linux/inet.h>
Mike Christie4e7aba72007-05-30 12:57:23 -050031#include <linux/file.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070032#include <linux/blkdev.h>
33#include <linux/crypto.h>
34#include <linux/delay.h>
35#include <linux/kfifo.h>
36#include <linux/scatterlist.h>
37#include <net/tcp.h>
38#include <scsi/scsi_cmnd.h>
Mike Christied1d81c02007-05-30 12:57:21 -050039#include <scsi/scsi_device.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070040#include <scsi/scsi_host.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_transport_iscsi.h>
43
44#include "iscsi_tcp.h"
45
Mike Christie38e1a8f2008-12-02 00:32:12 -060046MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
47 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
Alex Aizman7ba24712005-08-04 19:30:08 -070048 "Alex Aizman <itn780@yahoo.com>");
49MODULE_DESCRIPTION("iSCSI/TCP data-path");
50MODULE_LICENSE("GPL");
Alex Aizman7ba24712005-08-04 19:30:08 -070051
Mike Christie38e1a8f2008-12-02 00:32:12 -060052static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
53static struct scsi_host_template iscsi_sw_tcp_sht;
54static struct iscsi_transport iscsi_sw_tcp_transport;
Mike Christie75613522008-05-21 15:53:59 -050055
Alex Aizman7ba24712005-08-04 19:30:08 -070056static unsigned int iscsi_max_lun = 512;
57module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
58
Mike Christiec93f87c2009-03-05 14:46:00 -060059static int iscsi_sw_tcp_dbg;
60module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
61 S_IRUGO | S_IWUSR);
62MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
64
65#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
66 do { \
67 if (iscsi_sw_tcp_dbg) \
68 iscsi_conn_printk(KERN_INFO, _conn, \
69 "%s " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73
Olaf Kirchda32dd62007-12-13 12:43:21 -060074/**
Mike Christie38e1a8f2008-12-02 00:32:12 -060075 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
76 * @rd_desc: read descriptor
77 * @skb: socket buffer
78 * @offset: offset in skb
79 * @len: skb->len - offset
Olaf Kirchda32dd62007-12-13 12:43:21 -060080 */
Mike Christie38e1a8f2008-12-02 00:32:12 -060081static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
82 unsigned int offset, size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -070083{
Mike Christie38e1a8f2008-12-02 00:32:12 -060084 struct iscsi_conn *conn = rd_desc->arg.data;
85 unsigned int consumed, total_consumed = 0;
86 int status;
87
Mike Christiec93f87c2009-03-05 14:46:00 -060088 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
Mike Christie38e1a8f2008-12-02 00:32:12 -060089
90 do {
91 status = 0;
92 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
93 offset += consumed;
94 total_consumed += consumed;
95 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
96
Mike Christiec93f87c2009-03-05 14:46:00 -060097 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
98 skb->len - offset, status);
Mike Christie38e1a8f2008-12-02 00:32:12 -060099 return total_consumed;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600100}
Alex Aizman7ba24712005-08-04 19:30:08 -0700101
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500102/**
103 * iscsi_sw_sk_state_check - check socket state
104 * @sk: socket
105 *
106 * If the socket is in CLOSE or CLOSE_WAIT we should
107 * not close the connection if there is still some
108 * data pending.
109 */
110static inline int iscsi_sw_sk_state_check(struct sock *sk)
111{
Mike Christied1af8a32009-08-20 15:11:02 -0500112 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500113
Mike Christied1af8a32009-08-20 15:11:02 -0500114 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
115 !atomic_read(&sk->sk_rmem_alloc)) {
116 ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
117 iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
118 return -ECONNRESET;
119 }
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500120 return 0;
121}
122
Mike Christie38e1a8f2008-12-02 00:32:12 -0600123static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600124{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600125 struct iscsi_conn *conn = sk->sk_user_data;
126 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
127 read_descriptor_t rd_desc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700128
Mike Christie38e1a8f2008-12-02 00:32:12 -0600129 read_lock(&sk->sk_callback_lock);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600130
131 /*
Mike Christie38e1a8f2008-12-02 00:32:12 -0600132 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
133 * We set count to 1 because we want the network layer to
134 * hand us all the skbs that are available. iscsi_tcp_recv
135 * handled pdus that cross buffers or pdus that still need data.
Olaf Kircha8ac6312007-12-13 12:43:35 -0600136 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600137 rd_desc.arg.data = conn;
138 rd_desc.count = 1;
139 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600140
Mike Christied1af8a32009-08-20 15:11:02 -0500141 iscsi_sw_sk_state_check(sk);
Hannes Reinecke523eeac2009-08-20 15:10:57 -0500142
Mike Christie38e1a8f2008-12-02 00:32:12 -0600143 read_unlock(&sk->sk_callback_lock);
144
145 /* If we had to (atomically) map a highmem page,
146 * unmap it now. */
147 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600148}
Alex Aizman7ba24712005-08-04 19:30:08 -0700149
Mike Christie38e1a8f2008-12-02 00:32:12 -0600150static void iscsi_sw_tcp_state_change(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600151{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600152 struct iscsi_tcp_conn *tcp_conn;
153 struct iscsi_sw_tcp_conn *tcp_sw_conn;
154 struct iscsi_conn *conn;
155 struct iscsi_session *session;
156 void (*old_state_change)(struct sock *);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600157
Mike Christie38e1a8f2008-12-02 00:32:12 -0600158 read_lock(&sk->sk_callback_lock);
159
160 conn = (struct iscsi_conn*)sk->sk_user_data;
161 session = conn->session;
162
Mike Christied1af8a32009-08-20 15:11:02 -0500163 iscsi_sw_sk_state_check(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -0700164
Mike Christie38e1a8f2008-12-02 00:32:12 -0600165 tcp_conn = conn->dd_data;
166 tcp_sw_conn = tcp_conn->dd_data;
167 old_state_change = tcp_sw_conn->old_state_change;
168
169 read_unlock(&sk->sk_callback_lock);
170
171 old_state_change(sk);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600172}
Alex Aizman7ba24712005-08-04 19:30:08 -0700173
Olaf Kirchda32dd62007-12-13 12:43:21 -0600174/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600175 * iscsi_write_space - Called when more output buffer space is available
176 * @sk: socket space is available for
177 **/
178static void iscsi_sw_tcp_write_space(struct sock *sk)
Olaf Kirchda32dd62007-12-13 12:43:21 -0600179{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600180 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
181 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
182 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600183
Mike Christie38e1a8f2008-12-02 00:32:12 -0600184 tcp_sw_conn->old_write_space(sk);
Mike Christiec93f87c2009-03-05 14:46:00 -0600185 ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
Mike Christie32ae7632009-03-05 14:46:03 -0600186 iscsi_conn_queue_work(conn);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600187}
Olaf Kircha8ac6312007-12-13 12:43:35 -0600188
Mike Christie38e1a8f2008-12-02 00:32:12 -0600189static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
190{
191 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
192 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
193 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600194
Mike Christie38e1a8f2008-12-02 00:32:12 -0600195 /* assign new callbacks */
196 write_lock_bh(&sk->sk_callback_lock);
197 sk->sk_user_data = conn;
198 tcp_sw_conn->old_data_ready = sk->sk_data_ready;
199 tcp_sw_conn->old_state_change = sk->sk_state_change;
200 tcp_sw_conn->old_write_space = sk->sk_write_space;
201 sk->sk_data_ready = iscsi_sw_tcp_data_ready;
202 sk->sk_state_change = iscsi_sw_tcp_state_change;
203 sk->sk_write_space = iscsi_sw_tcp_write_space;
204 write_unlock_bh(&sk->sk_callback_lock);
205}
Alex Aizman7ba24712005-08-04 19:30:08 -0700206
Mike Christie38e1a8f2008-12-02 00:32:12 -0600207static void
208iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn)
209{
210 struct sock *sk = tcp_sw_conn->sock->sk;
Olaf Kirchda32dd62007-12-13 12:43:21 -0600211
Mike Christie38e1a8f2008-12-02 00:32:12 -0600212 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
213 write_lock_bh(&sk->sk_callback_lock);
214 sk->sk_user_data = NULL;
215 sk->sk_data_ready = tcp_sw_conn->old_data_ready;
216 sk->sk_state_change = tcp_sw_conn->old_state_change;
217 sk->sk_write_space = tcp_sw_conn->old_write_space;
218 sk->sk_no_check = 0;
219 write_unlock_bh(&sk->sk_callback_lock);
Olaf Kirchda32dd62007-12-13 12:43:21 -0600220}
221
222/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600223 * iscsi_sw_tcp_xmit_segment - transmit segment
Mike Christie6df19a72008-12-02 00:32:16 -0600224 * @tcp_conn: the iSCSI TCP connection
Olaf Kircha8ac6312007-12-13 12:43:35 -0600225 * @segment: the buffer to transmnit
226 *
227 * This function transmits as much of the buffer as
228 * the network layer will accept, and returns the number of
229 * bytes transmitted.
230 *
231 * If CRC hashing is enabled, the function will compute the
232 * hash as it goes. When the entire segment has been transmitted,
233 * it will retrieve the hash value and send it as well.
234 */
Mike Christie6df19a72008-12-02 00:32:16 -0600235static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600236 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600237{
Mike Christie6df19a72008-12-02 00:32:16 -0600238 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600239 struct socket *sk = tcp_sw_conn->sock;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600240 unsigned int copied = 0;
241 int r = 0;
242
Mike Christie6df19a72008-12-02 00:32:16 -0600243 while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
Olaf Kircha8ac6312007-12-13 12:43:35 -0600244 struct scatterlist *sg;
245 unsigned int offset, copy;
246 int flags = 0;
247
248 r = 0;
249 offset = segment->copied;
250 copy = segment->size - offset;
251
252 if (segment->total_copied + segment->size < segment->total_size)
253 flags |= MSG_MORE;
254
255 /* Use sendpage if we can; else fall back to sendmsg */
256 if (!segment->data) {
257 sg = segment->sg;
258 offset += segment->sg_offset + sg->offset;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600259 r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
260 copy, flags);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600261 } else {
262 struct msghdr msg = { .msg_flags = flags };
263 struct kvec iov = {
264 .iov_base = segment->data + offset,
265 .iov_len = copy
266 };
267
268 r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
269 }
270
271 if (r < 0) {
272 iscsi_tcp_segment_unmap(segment);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600273 return r;
274 }
275 copied += r;
276 }
277 return copied;
278}
279
280/**
Mike Christie38e1a8f2008-12-02 00:32:12 -0600281 * iscsi_sw_tcp_xmit - TCP transmit
Alex Aizman7ba24712005-08-04 19:30:08 -0700282 **/
Mike Christie38e1a8f2008-12-02 00:32:12 -0600283static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700284{
Mike Christie5bb0b552006-04-06 21:26:46 -0500285 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600286 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
287 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600288 unsigned int consumed = 0;
289 int rc = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700290
Olaf Kircha8ac6312007-12-13 12:43:35 -0600291 while (1) {
Mike Christie6df19a72008-12-02 00:32:16 -0600292 rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
Mike Christie32382492009-06-15 22:11:09 -0500293 /*
294 * We may not have been able to send data because the conn
295 * is getting stopped. libiscsi will know so propogate err
296 * for it to do the right thing.
297 */
298 if (rc == -EAGAIN)
299 return rc;
300 else if (rc < 0) {
Mike Christie6f481e32008-09-24 11:46:13 -0500301 rc = ISCSI_ERR_XMIT_FAILED;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600302 goto error;
Mike Christie32382492009-06-15 22:11:09 -0500303 } else if (rc == 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600304 break;
305
306 consumed += rc;
307
308 if (segment->total_copied >= segment->total_size) {
309 if (segment->done != NULL) {
310 rc = segment->done(tcp_conn, segment);
Mike Christie6f481e32008-09-24 11:46:13 -0500311 if (rc != 0)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600312 goto error;
313 }
314 }
315 }
316
Mike Christiec93f87c2009-03-05 14:46:00 -0600317 ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600318
319 conn->txdata_octets += consumed;
320 return consumed;
321
322error:
323 /* Transmit error. We could initiate error recovery
324 * here. */
Mike Christiec93f87c2009-03-05 14:46:00 -0600325 ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
Mike Christie6f481e32008-09-24 11:46:13 -0500326 iscsi_conn_failure(conn, rc);
327 return -EIO;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600328}
329
330/**
331 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
332 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600333static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600334{
335 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600336 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
337 struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600338
339 return segment->total_copied - segment->total_size;
340}
341
Mike Christie38e1a8f2008-12-02 00:32:12 -0600342static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600343{
Mike Christiee5a7efe2008-12-02 00:32:07 -0600344 struct iscsi_conn *conn = task->conn;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600345 int rc;
346
Mike Christie38e1a8f2008-12-02 00:32:12 -0600347 while (iscsi_sw_tcp_xmit_qlen(conn)) {
348 rc = iscsi_sw_tcp_xmit(conn);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600349 if (rc == 0)
350 return -EAGAIN;
351 if (rc < 0)
352 return rc;
353 }
354
355 return 0;
356}
357
358/*
359 * This is called when we're done sending the header.
360 * Simply copy the data_segment to the send segment, and return.
361 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600362static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
363 struct iscsi_segment *segment)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600364{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600365 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
366
367 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
Mike Christiec93f87c2009-03-05 14:46:00 -0600368 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
369 "Header done. Next segment size %u total_size %u\n",
370 tcp_sw_conn->out.segment.size,
371 tcp_sw_conn->out.segment.total_size);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600372 return 0;
373}
374
Mike Christie38e1a8f2008-12-02 00:32:12 -0600375static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
376 size_t hdrlen)
Olaf Kircha8ac6312007-12-13 12:43:35 -0600377{
378 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600379 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600380
Mike Christiec93f87c2009-03-05 14:46:00 -0600381 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
382 "digest enabled" : "digest disabled");
Olaf Kircha8ac6312007-12-13 12:43:35 -0600383
384 /* Clear the data segment - needs to be filled in by the
385 * caller using iscsi_tcp_send_data_prep() */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600386 memset(&tcp_sw_conn->out.data_segment, 0,
387 sizeof(struct iscsi_segment));
Olaf Kircha8ac6312007-12-13 12:43:35 -0600388
389 /* If header digest is enabled, compute the CRC and
390 * place the digest into the same buffer. We make
Mike Christie135a8ad2008-05-21 15:54:10 -0500391 * sure that both iscsi_tcp_task and mtask have
Olaf Kircha8ac6312007-12-13 12:43:35 -0600392 * sufficient room.
Mike Christie7cae5152006-01-13 18:05:47 -0600393 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600394 if (conn->hdrdgst_en) {
Mike Christie38e1a8f2008-12-02 00:32:12 -0600395 iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600396 hdr + hdrlen);
397 hdrlen += ISCSI_DIGEST_SIZE;
Mike Christie3219e522006-05-30 00:37:28 -0500398 }
399
Olaf Kircha8ac6312007-12-13 12:43:35 -0600400 /* Remember header pointer for later, when we need
401 * to decide whether there's a payload to go along
402 * with the header. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600403 tcp_sw_conn->out.hdr = hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600404
Mike Christie38e1a8f2008-12-02 00:32:12 -0600405 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
406 iscsi_sw_tcp_send_hdr_done, NULL);
Alex Aizman7ba24712005-08-04 19:30:08 -0700407}
408
Olaf Kircha8ac6312007-12-13 12:43:35 -0600409/*
410 * Prepare the send buffer for the payload data.
411 * Padding and checksumming will all be taken care
412 * of by the iscsi_segment routines.
413 */
414static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600415iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
416 unsigned int count, unsigned int offset,
417 unsigned int len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700418{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600419 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600420 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600421 struct hash_desc *tx_hash = NULL;
422 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700423
Mike Christiec93f87c2009-03-05 14:46:00 -0600424 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
425 conn->datadgst_en ?
426 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700427
Olaf Kircha8ac6312007-12-13 12:43:35 -0600428 /* Make sure the datalen matches what the caller
429 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600430 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600431 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700432
Olaf Kircha8ac6312007-12-13 12:43:35 -0600433 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600434 tx_hash = &tcp_sw_conn->tx_hash;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600435
Mike Christie38e1a8f2008-12-02 00:32:12 -0600436 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
437 sg, count, offset, len,
438 NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700439}
440
Olaf Kircha8ac6312007-12-13 12:43:35 -0600441static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600442iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600443 size_t len)
Alex Aizman7ba24712005-08-04 19:30:08 -0700444{
Olaf Kircha8ac6312007-12-13 12:43:35 -0600445 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600446 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600447 struct hash_desc *tx_hash = NULL;
448 unsigned int hdr_spec_len;
Alex Aizman7ba24712005-08-04 19:30:08 -0700449
Mike Christiec93f87c2009-03-05 14:46:00 -0600450 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
451 "digest enabled" : "digest disabled");
Alex Aizman7ba24712005-08-04 19:30:08 -0700452
Olaf Kircha8ac6312007-12-13 12:43:35 -0600453 /* Make sure the datalen matches what the caller
454 said he would send. */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600455 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
Olaf Kircha8ac6312007-12-13 12:43:35 -0600456 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
Alex Aizman7ba24712005-08-04 19:30:08 -0700457
Olaf Kircha8ac6312007-12-13 12:43:35 -0600458 if (conn->datadgst_en)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600459 tx_hash = &tcp_sw_conn->tx_hash;
Alex Aizman7ba24712005-08-04 19:30:08 -0700460
Mike Christie38e1a8f2008-12-02 00:32:12 -0600461 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
Olaf Kircha8ac6312007-12-13 12:43:35 -0600462 data, len, NULL, tx_hash);
Alex Aizman7ba24712005-08-04 19:30:08 -0700463}
464
Mike Christie38e1a8f2008-12-02 00:32:12 -0600465static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
466 unsigned int offset, unsigned int count)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600467{
468 struct iscsi_conn *conn = task->conn;
469 int err = 0;
470
Mike Christie38e1a8f2008-12-02 00:32:12 -0600471 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600472
473 if (!count)
474 return 0;
475
476 if (!task->sc)
Mike Christie38e1a8f2008-12-02 00:32:12 -0600477 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600478 else {
479 struct scsi_data_buffer *sdb = scsi_out(task->sc);
480
Mike Christie38e1a8f2008-12-02 00:32:12 -0600481 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
482 sdb->table.nents, offset,
483 count);
Mike Christiee5a7efe2008-12-02 00:32:07 -0600484 }
485
486 if (err) {
Mike Christie9a6510e2009-04-21 15:32:31 -0500487 /* got invalid offset/len */
Mike Christiee5a7efe2008-12-02 00:32:07 -0600488 return -EIO;
489 }
490 return 0;
491}
492
Mike Christie2ff79d52008-12-02 00:32:14 -0600493static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christiee5a7efe2008-12-02 00:32:07 -0600494{
495 struct iscsi_tcp_task *tcp_task = task->dd_data;
496
Mike Christie38e1a8f2008-12-02 00:32:12 -0600497 task->hdr = task->dd_data + sizeof(*tcp_task);
498 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
Mike Christiee5a7efe2008-12-02 00:32:07 -0600499 return 0;
500}
501
Mike Christie7b8631b2006-01-13 18:05:50 -0600502static struct iscsi_cls_conn *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600503iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
504 uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -0700505{
Mike Christie7b8631b2006-01-13 18:05:50 -0600506 struct iscsi_conn *conn;
507 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -0500508 struct iscsi_tcp_conn *tcp_conn;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600509 struct iscsi_sw_tcp_conn *tcp_sw_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700510
Mike Christie38e1a8f2008-12-02 00:32:12 -0600511 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
512 conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -0600513 if (!cls_conn)
514 return NULL;
515 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -0500516 tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600517 tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700518
Mike Christie38e1a8f2008-12-02 00:32:12 -0600519 tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
520 CRYPTO_ALG_ASYNC);
521 tcp_sw_conn->tx_hash.flags = 0;
522 if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
Mike Christie5d91e202008-05-21 15:54:01 -0500523 goto free_conn;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400524
Mike Christie38e1a8f2008-12-02 00:32:12 -0600525 tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
526 CRYPTO_ALG_ASYNC);
527 tcp_sw_conn->rx_hash.flags = 0;
528 if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
Mike Christiedd8c0d92006-08-31 18:09:28 -0400529 goto free_tx_tfm;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600530 tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
Mike Christiedd8c0d92006-08-31 18:09:28 -0400531
Mike Christie7b8631b2006-01-13 18:05:50 -0600532 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -0700533
Mike Christiedd8c0d92006-08-31 18:09:28 -0400534free_tx_tfm:
Mike Christie38e1a8f2008-12-02 00:32:12 -0600535 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
Mike Christie5d91e202008-05-21 15:54:01 -0500536free_conn:
Mike Christie322d7392008-01-31 13:36:52 -0600537 iscsi_conn_printk(KERN_ERR, conn,
538 "Could not create connection due to crc32c "
539 "loading error. Make sure the crc32c "
540 "module is built as a module or into the "
541 "kernel\n");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600542 iscsi_tcp_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -0600543 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700544}
545
Mike Christie38e1a8f2008-12-02 00:32:12 -0600546static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
Mike Christie1c834692006-07-24 15:47:26 -0500547{
Mike Christie22236962007-05-30 12:57:24 -0500548 struct iscsi_session *session = conn->session;
Mike Christie1c834692006-07-24 15:47:26 -0500549 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600550 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
551 struct socket *sock = tcp_sw_conn->sock;
Mike Christie1c834692006-07-24 15:47:26 -0500552
Mike Christie22236962007-05-30 12:57:24 -0500553 if (!sock)
Mike Christie1c834692006-07-24 15:47:26 -0500554 return;
555
Mike Christie22236962007-05-30 12:57:24 -0500556 sock_hold(sock->sk);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600557 iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn);
Mike Christie22236962007-05-30 12:57:24 -0500558 sock_put(sock->sk);
Mike Christie1c834692006-07-24 15:47:26 -0500559
Mike Christie22236962007-05-30 12:57:24 -0500560 spin_lock_bh(&session->lock);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600561 tcp_sw_conn->sock = NULL;
Mike Christie22236962007-05-30 12:57:24 -0500562 spin_unlock_bh(&session->lock);
563 sockfd_put(sock);
Mike Christie1c834692006-07-24 15:47:26 -0500564}
565
Mike Christie38e1a8f2008-12-02 00:32:12 -0600566static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700567{
Mike Christie7b8631b2006-01-13 18:05:50 -0600568 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500569 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600570 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700571
Mike Christie38e1a8f2008-12-02 00:32:12 -0600572 iscsi_sw_tcp_release_conn(conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700573
Mike Christie38e1a8f2008-12-02 00:32:12 -0600574 if (tcp_sw_conn->tx_hash.tfm)
575 crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
576 if (tcp_sw_conn->rx_hash.tfm)
577 crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -0700578
Mike Christie38e1a8f2008-12-02 00:32:12 -0600579 iscsi_tcp_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700580}
581
Mike Christie38e1a8f2008-12-02 00:32:12 -0600582static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
Mike Christie1c834692006-07-24 15:47:26 -0500583{
584 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500585 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600586 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie913e5bf2008-05-21 15:54:18 -0500587
588 /* userspace may have goofed up and not bound us */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600589 if (!tcp_sw_conn->sock)
Mike Christie913e5bf2008-05-21 15:54:18 -0500590 return;
591 /*
592 * Make sure our recv side is stopped.
593 * Older tools called conn stop before ep_disconnect
594 * so IO could still be coming in.
595 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600596 write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
Mike Christie913e5bf2008-05-21 15:54:18 -0500597 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600598 write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
Mike Christie1c834692006-07-24 15:47:26 -0500599
600 iscsi_conn_stop(cls_conn, flag);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600601 iscsi_sw_tcp_release_conn(conn);
Mike Christie1c834692006-07-24 15:47:26 -0500602}
603
Mike Christie38e1a8f2008-12-02 00:32:12 -0600604static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
605 char *buf, int *port,
606 int (*getname)(struct socket *,
607 struct sockaddr *,
608 int *addrlen))
Mike Christie22236962007-05-30 12:57:24 -0500609{
610 struct sockaddr_storage *addr;
611 struct sockaddr_in6 *sin6;
612 struct sockaddr_in *sin;
613 int rc = 0, len;
614
Al Viroa9204872007-07-20 16:03:40 +0100615 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
Mike Christie22236962007-05-30 12:57:24 -0500616 if (!addr)
617 return -ENOMEM;
618
619 if (getname(sock, (struct sockaddr *) addr, &len)) {
620 rc = -ENODEV;
621 goto free_addr;
622 }
623
624 switch (addr->ss_family) {
625 case AF_INET:
626 sin = (struct sockaddr_in *)addr;
627 spin_lock_bh(&conn->session->lock);
Harvey Harrison63779432008-10-31 00:56:00 -0700628 sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
Mike Christie22236962007-05-30 12:57:24 -0500629 *port = be16_to_cpu(sin->sin_port);
630 spin_unlock_bh(&conn->session->lock);
631 break;
632 case AF_INET6:
633 sin6 = (struct sockaddr_in6 *)addr;
634 spin_lock_bh(&conn->session->lock);
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700635 sprintf(buf, "%pI6", &sin6->sin6_addr);
Mike Christie22236962007-05-30 12:57:24 -0500636 *port = be16_to_cpu(sin6->sin6_port);
637 spin_unlock_bh(&conn->session->lock);
638 break;
639 }
640free_addr:
641 kfree(addr);
642 return rc;
643}
644
Alex Aizman7ba24712005-08-04 19:30:08 -0700645static int
Mike Christie38e1a8f2008-12-02 00:32:12 -0600646iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
647 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
648 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -0700649{
Mike Christie75613522008-05-21 15:53:59 -0500650 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
651 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500652 struct iscsi_conn *conn = cls_conn->dd_data;
653 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600654 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700655 struct sock *sk;
656 struct socket *sock;
657 int err;
658
659 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -0500660 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700661 if (!sock) {
Mike Christie322d7392008-01-31 13:36:52 -0600662 iscsi_conn_printk(KERN_ERR, conn,
663 "sockfd_lookup failed %d\n", err);
Alex Aizman7ba24712005-08-04 19:30:08 -0700664 return -EEXIST;
665 }
Mike Christie22236962007-05-30 12:57:24 -0500666 /*
667 * copy these values now because if we drop the session
668 * userspace may still want to query the values since we will
669 * be using them for the reconnect
670 */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600671 err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
672 &conn->portal_port, kernel_getpeername);
Mike Christie22236962007-05-30 12:57:24 -0500673 if (err)
674 goto free_socket;
675
Mike Christie38e1a8f2008-12-02 00:32:12 -0600676 err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
677 &ihost->local_port, kernel_getsockname);
Mike Christie22236962007-05-30 12:57:24 -0500678 if (err)
679 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700680
Mike Christie5bb0b552006-04-06 21:26:46 -0500681 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
682 if (err)
Mike Christie22236962007-05-30 12:57:24 -0500683 goto free_socket;
Alex Aizman7ba24712005-08-04 19:30:08 -0700684
Mike Christie67a61112006-05-30 00:37:20 -0500685 /* bind iSCSI connection and socket */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600686 tcp_sw_conn->sock = sock;
Alex Aizman7ba24712005-08-04 19:30:08 -0700687
Mike Christie67a61112006-05-30 00:37:20 -0500688 /* setup Socket parameters */
689 sk = sock->sk;
690 sk->sk_reuse = 1;
691 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
692 sk->sk_allocation = GFP_ATOMIC;
Alex Aizman7ba24712005-08-04 19:30:08 -0700693
Mike Christie38e1a8f2008-12-02 00:32:12 -0600694 iscsi_sw_tcp_conn_set_callbacks(conn);
695 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
Mike Christie67a61112006-05-30 00:37:20 -0500696 /*
697 * set receive state machine into initial state
698 */
Olaf Kirchda32dd62007-12-13 12:43:21 -0600699 iscsi_tcp_hdr_recv_prep(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700700 return 0;
Mike Christie22236962007-05-30 12:57:24 -0500701
702free_socket:
703 sockfd_put(sock);
704 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -0700705}
706
Mike Christie38e1a8f2008-12-02 00:32:12 -0600707static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
708 enum iscsi_param param, char *buf,
709 int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -0700710{
Mike Christie7b7232f2006-02-01 21:06:49 -0600711 struct iscsi_conn *conn = cls_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700712 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500713 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600714 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500715 int value;
Alex Aizman7ba24712005-08-04 19:30:08 -0700716
Alex Aizman7ba24712005-08-04 19:30:08 -0700717 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700718 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500719 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700720 break;
721 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500722 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600723 tcp_sw_conn->sendpage = conn->datadgst_en ?
724 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -0700725 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700726 case ISCSI_PARAM_MAX_R2T:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500727 sscanf(buf, "%d", &value);
Mike Christiedf93ffc2007-12-13 12:43:42 -0600728 if (value <= 0 || !is_power_of_2(value))
729 return -EINVAL;
730 if (session->max_r2t == value)
Alex Aizman7ba24712005-08-04 19:30:08 -0700731 break;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600732 iscsi_tcp_r2tpool_free(session);
Mike Christie5c75b7f2006-06-28 12:00:26 -0500733 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie38e1a8f2008-12-02 00:32:12 -0600734 if (iscsi_tcp_r2tpool_alloc(session))
Alex Aizman7ba24712005-08-04 19:30:08 -0700735 return -ENOMEM;
736 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700737 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500738 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700739 }
740
741 return 0;
742}
743
Mike Christie38e1a8f2008-12-02 00:32:12 -0600744static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
745 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -0600746{
Mike Christie7b7232f2006-02-01 21:06:49 -0600747 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -0500748 int len;
Mike Christie7b8631b2006-01-13 18:05:50 -0600749
750 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -0500751 case ISCSI_PARAM_CONN_PORT:
Mike Christie22236962007-05-30 12:57:24 -0500752 spin_lock_bh(&conn->session->lock);
753 len = sprintf(buf, "%hu\n", conn->portal_port);
754 spin_unlock_bh(&conn->session->lock);
Mike Christie8d2860b2006-05-02 19:46:47 -0500755 break;
Mike Christiefd7255f2006-04-06 21:13:36 -0500756 case ISCSI_PARAM_CONN_ADDRESS:
Mike Christie22236962007-05-30 12:57:24 -0500757 spin_lock_bh(&conn->session->lock);
758 len = sprintf(buf, "%s\n", conn->portal_address);
759 spin_unlock_bh(&conn->session->lock);
Mike Christiefd7255f2006-04-06 21:13:36 -0500760 break;
761 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -0500762 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -0500763 }
764
765 return len;
766}
767
Alex Aizman7ba24712005-08-04 19:30:08 -0700768static void
Mike Christie38e1a8f2008-12-02 00:32:12 -0600769iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
770 struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -0700771{
Mike Christie7b7232f2006-02-01 21:06:49 -0600772 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500773 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600774 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700775
Alex Aizman7ba24712005-08-04 19:30:08 -0700776 stats->custom_length = 3;
777 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600778 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700779 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie38e1a8f2008-12-02 00:32:12 -0600780 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700781 strcpy(stats->custom[2].desc, "eh_abort_cnt");
782 stats->custom[2].value = conn->eh_abort_cnt;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600783
784 iscsi_tcp_conn_get_stats(cls_conn, stats);
Alex Aizman7ba24712005-08-04 19:30:08 -0700785}
786
Mike Christie5bb0b552006-04-06 21:26:46 -0500787static struct iscsi_cls_session *
Mike Christie38e1a8f2008-12-02 00:32:12 -0600788iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
Mike Christie5e7facb2009-03-05 14:46:06 -0600789 uint16_t qdepth, uint32_t initial_cmdsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700790{
Mike Christie5bb0b552006-04-06 21:26:46 -0500791 struct iscsi_cls_session *cls_session;
792 struct iscsi_session *session;
Mike Christie06520ede2008-05-21 15:54:15 -0500793 struct Scsi_Host *shost;
Alex Aizman7ba24712005-08-04 19:30:08 -0700794
Mike Christie06520ede2008-05-21 15:54:15 -0500795 if (ep) {
796 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
Mike Christie5bb0b552006-04-06 21:26:46 -0500797 return NULL;
Mike Christie75613522008-05-21 15:53:59 -0500798 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700799
Mike Christie4d108352009-03-05 14:46:04 -0600800 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1);
Mike Christie75613522008-05-21 15:53:59 -0500801 if (!shost)
802 return NULL;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600803 shost->transportt = iscsi_sw_tcp_scsi_transport;
Mike Christie4d108352009-03-05 14:46:04 -0600804 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500805 shost->max_lun = iscsi_max_lun;
806 shost->max_id = 0;
807 shost->max_channel = 0;
Boaz Harrosh30e9ba92008-05-26 11:31:19 +0300808 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
Mike Christie75613522008-05-21 15:53:59 -0500809
Mike Christiea4804cd2008-05-21 15:54:00 -0500810 if (iscsi_host_add(shost, NULL))
Mike Christie75613522008-05-21 15:53:59 -0500811 goto free_host;
Mike Christie75613522008-05-21 15:53:59 -0500812
Mike Christie38e1a8f2008-12-02 00:32:12 -0600813 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +0530814 cmds_max, 0,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600815 sizeof(struct iscsi_tcp_task) +
816 sizeof(struct iscsi_sw_tcp_hdrbuf),
Mike Christie79706342008-05-21 15:54:12 -0500817 initial_cmdsn, 0);
Mike Christie75613522008-05-21 15:53:59 -0500818 if (!cls_session)
819 goto remove_host;
820 session = cls_session->dd_data;
821
Mike Christiefbc514b2008-05-21 15:54:07 -0500822 shost->can_queue = session->scsi_cmds_max;
Mike Christie38e1a8f2008-12-02 00:32:12 -0600823 if (iscsi_tcp_r2tpool_alloc(session))
Mike Christie75613522008-05-21 15:53:59 -0500824 goto remove_session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500825 return cls_session;
826
Mike Christie75613522008-05-21 15:53:59 -0500827remove_session:
Mike Christie5bb0b552006-04-06 21:26:46 -0500828 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500829remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500830 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500831free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500832 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500833 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700834}
835
Mike Christie38e1a8f2008-12-02 00:32:12 -0600836static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
Mike Christie5bb0b552006-04-06 21:26:46 -0500837{
Mike Christie75613522008-05-21 15:53:59 -0500838 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
839
Mike Christie38e1a8f2008-12-02 00:32:12 -0600840 iscsi_tcp_r2tpool_free(cls_session->dd_data);
Mike Christiee5bd7b52008-09-24 11:46:10 -0500841 iscsi_session_teardown(cls_session);
Mike Christie75613522008-05-21 15:53:59 -0500842
Mike Christiea4804cd2008-05-21 15:54:00 -0500843 iscsi_host_remove(shost);
844 iscsi_host_free(shost);
Mike Christie5bb0b552006-04-06 21:26:46 -0500845}
846
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600847static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
848{
849 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
850 return 0;
851}
852
Mike Christie38e1a8f2008-12-02 00:32:12 -0600853static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
Mike Christied1d81c02007-05-30 12:57:21 -0500854{
Mike Christieb6d44fe2007-07-26 12:46:47 -0500855 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
Mike Christied1d81c02007-05-30 12:57:21 -0500856 blk_queue_dma_alignment(sdev->request_queue, 0);
857 return 0;
858}
859
Mike Christie38e1a8f2008-12-02 00:32:12 -0600860static struct scsi_host_template iscsi_sw_tcp_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500861 .module = THIS_MODULE,
Mike Christief4246b32006-07-24 15:47:54 -0500862 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -0500863 .queuecommand = iscsi_queuecommand,
864 .change_queue_depth = iscsi_change_queue_depth,
Mike Christie15482712007-05-30 12:57:19 -0500865 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
Mike Christie66bbe0c2007-12-13 12:43:39 -0600866 .sg_tablesize = 4096,
Mike Christie8231f0e2007-02-28 17:32:20 -0600867 .max_sectors = 0xFFFF,
Mike Christie5bb0b552006-04-06 21:26:46 -0500868 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
869 .eh_abort_handler = iscsi_eh_abort,
Mike Christie843c0a82007-12-13 12:43:20 -0600870 .eh_device_reset_handler= iscsi_eh_device_reset,
Mike Christie8e124522008-09-24 11:46:12 -0500871 .eh_target_reset_handler= iscsi_eh_target_reset,
Mike Christie5bb0b552006-04-06 21:26:46 -0500872 .use_clustering = DISABLE_CLUSTERING,
Pete Wyckoff091e6db2009-03-05 14:45:56 -0600873 .slave_alloc = iscsi_sw_tcp_slave_alloc,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600874 .slave_configure = iscsi_sw_tcp_slave_configure,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500875 .target_alloc = iscsi_target_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500876 .proc_name = "iscsi_tcp",
877 .this_id = -1,
878};
879
Mike Christie38e1a8f2008-12-02 00:32:12 -0600880static struct iscsi_transport iscsi_sw_tcp_transport = {
Alex Aizman7ba24712005-08-04 19:30:08 -0700881 .owner = THIS_MODULE,
882 .name = "tcp",
883 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
884 | CAP_DATADGST,
Mike Christiefd7255f2006-04-06 21:13:36 -0500885 .param_mask = ISCSI_MAX_RECV_DLENGTH |
886 ISCSI_MAX_XMIT_DLENGTH |
887 ISCSI_HDRDGST_EN |
888 ISCSI_DATADGST_EN |
889 ISCSI_INITIAL_R2T_EN |
890 ISCSI_MAX_R2T |
891 ISCSI_IMM_DATA_EN |
892 ISCSI_FIRST_BURST |
893 ISCSI_MAX_BURST |
894 ISCSI_PDU_INORDER_EN |
895 ISCSI_DATASEQ_INORDER_EN |
896 ISCSI_ERL |
897 ISCSI_CONN_PORT |
Mike Christie8d2860b2006-05-02 19:46:47 -0500898 ISCSI_CONN_ADDRESS |
Mike Christie5c75b7f2006-06-28 12:00:26 -0500899 ISCSI_EXP_STATSN |
900 ISCSI_PERSISTENT_PORT |
901 ISCSI_PERSISTENT_ADDRESS |
Mike Christieb2c64162007-05-30 12:57:16 -0500902 ISCSI_TARGET_NAME | ISCSI_TPGT |
903 ISCSI_USERNAME | ISCSI_PASSWORD |
Mike Christie843c0a82007-12-13 12:43:20 -0600904 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
Mike Christief6d51802007-12-13 12:43:30 -0600905 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
Mike Christie3fe5ae82009-11-11 16:34:33 -0600906 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
Mike Christie88dfd342008-05-21 15:54:16 -0500907 ISCSI_PING_TMO | ISCSI_RECV_TMO |
908 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
Mike Christie22236962007-05-30 12:57:24 -0500909 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
Mike Christied8196ed2007-05-30 12:57:25 -0500910 ISCSI_HOST_INITIATOR_NAME |
911 ISCSI_HOST_NETDEV_NAME,
Mike Christie5bb0b552006-04-06 21:26:46 -0500912 /* session management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600913 .create_session = iscsi_sw_tcp_session_create,
914 .destroy_session = iscsi_sw_tcp_session_destroy,
Mike Christie5bb0b552006-04-06 21:26:46 -0500915 /* connection management */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600916 .create_conn = iscsi_sw_tcp_conn_create,
917 .bind_conn = iscsi_sw_tcp_conn_bind,
918 .destroy_conn = iscsi_sw_tcp_conn_destroy,
919 .set_param = iscsi_sw_tcp_conn_set_param,
920 .get_conn_param = iscsi_sw_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -0600921 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -0700922 .start_conn = iscsi_conn_start,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600923 .stop_conn = iscsi_sw_tcp_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500924 /* iscsi host params */
Mike Christie75613522008-05-21 15:53:59 -0500925 .get_host_param = iscsi_host_get_param,
Mike Christie0801c242007-05-30 12:57:12 -0500926 .set_host_param = iscsi_host_set_param,
Mike Christie5bb0b552006-04-06 21:26:46 -0500927 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -0700928 .send_pdu = iscsi_conn_send_pdu,
Mike Christie38e1a8f2008-12-02 00:32:12 -0600929 .get_stats = iscsi_sw_tcp_conn_get_stats,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600930 /* iscsi task/cmd helpers */
Mike Christiefbc514b2008-05-21 15:54:07 -0500931 .init_task = iscsi_tcp_task_init,
932 .xmit_task = iscsi_tcp_task_xmit,
933 .cleanup_task = iscsi_tcp_cleanup_task,
Mike Christiee5a7efe2008-12-02 00:32:07 -0600934 /* low level pdu helpers */
Mike Christie38e1a8f2008-12-02 00:32:12 -0600935 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
936 .init_pdu = iscsi_sw_tcp_pdu_init,
937 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
Mike Christie5bb0b552006-04-06 21:26:46 -0500938 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -0500939 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -0700940};
941
Mike Christie38e1a8f2008-12-02 00:32:12 -0600942static int __init iscsi_sw_tcp_init(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700943{
Alex Aizman7ba24712005-08-04 19:30:08 -0700944 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -0500945 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
946 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -0700947 return -EINVAL;
948 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700949
Mike Christie38e1a8f2008-12-02 00:32:12 -0600950 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
951 &iscsi_sw_tcp_transport);
952 if (!iscsi_sw_tcp_scsi_transport)
Mike Christieffbfe922006-05-18 20:31:36 -0500953 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -0700954
Mike Christie7b8631b2006-01-13 18:05:50 -0600955 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700956}
957
Mike Christie38e1a8f2008-12-02 00:32:12 -0600958static void __exit iscsi_sw_tcp_exit(void)
Alex Aizman7ba24712005-08-04 19:30:08 -0700959{
Mike Christie38e1a8f2008-12-02 00:32:12 -0600960 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -0700961}
962
Mike Christie38e1a8f2008-12-02 00:32:12 -0600963module_init(iscsi_sw_tcp_init);
964module_exit(iscsi_sw_tcp_exit);