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Commit | Line | Data |
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7ba24713 AA |
1 | /* |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
6 | * Copyright (C) 2005 - 2006 Mike Christie |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
8 | * 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> | |
7ba24713 | 30 | #include <linux/inet.h> |
4e7aba73 | 31 | #include <linux/file.h> |
7ba24713 AA |
32 | #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> | |
d1d81c01 | 39 | #include <scsi/scsi_device.h> |
7ba24713 AA |
40 | #include <scsi/scsi_host.h> |
41 | #include <scsi/scsi.h> | |
42 | #include <scsi/scsi_transport_iscsi.h> | |
43 | ||
44 | #include "iscsi_tcp.h" | |
45 | ||
38e1a8f5 MC |
46 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
47 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
48 | "Alex Aizman <itn780@yahoo.com>"); |
49 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
50 | MODULE_LICENSE("GPL"); | |
7ba24713 | 51 | |
38e1a8f5 MC |
52 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
53 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
54 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 55 | |
7ba24713 AA |
56 | static unsigned int iscsi_max_lun = 512; |
57 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
58 | ||
c93f87c7 MC |
59 | static int iscsi_sw_tcp_dbg; |
60 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
61 | S_IRUGO | S_IWUSR); | |
62 | MODULE_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 | ||
da32dd68 | 74 | /** |
38e1a8f5 | 75 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
76 | * @rd_desc: read descriptor |
77 | * @skb: socket buffer | |
78 | * @offset: offset in skb | |
79 | * @len: skb->len - offset | |
38e1a8f5 MC |
80 | */ |
81 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
82 | unsigned int offset, size_t len) | |
63c62f1c MC |
83 | { |
84 | struct iscsi_conn *conn = rd_desc->arg.data; | |
85 | unsigned int consumed, total_consumed = 0; | |
86 | int status; | |
87 | ||
c93f87c7 | 88 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
89 | |
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 | ||
c93f87c7 MC |
97 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
98 | skb->len - offset, status); | |
63c62f1c | 99 | return total_consumed; |
7ba24713 AA |
100 | } |
101 | ||
38e1a8f5 | 102 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 AA |
103 | { |
104 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 105 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
106 | read_descriptor_t rd_desc; |
107 | ||
108 | read_lock(&sk->sk_callback_lock); | |
109 | ||
665b44ae | 110 | /* |
da32dd68 | 111 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 112 | * We set count to 1 because we want the network layer to |
da32dd68 | 113 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
114 | * handled pdus that cross buffers or pdus that still need data. |
115 | */ | |
7ba24713 | 116 | rd_desc.arg.data = conn; |
665b44ae | 117 | rd_desc.count = 1; |
38e1a8f5 | 118 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 AA |
119 | |
120 | read_unlock(&sk->sk_callback_lock); | |
da32dd68 OK |
121 | |
122 | /* If we had to (atomically) map a highmem page, | |
123 | * unmap it now. */ | |
a8ac6311 | 124 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7ba24713 AA |
125 | } |
126 | ||
38e1a8f5 | 127 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 128 | { |
5bb0b55a | 129 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 130 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 AA |
131 | struct iscsi_conn *conn; |
132 | struct iscsi_session *session; | |
133 | void (*old_state_change)(struct sock *); | |
134 | ||
135 | read_lock(&sk->sk_callback_lock); | |
136 | ||
137 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
138 | session = conn->session; | |
139 | ||
e6273993 MC |
140 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
141 | sk->sk_state == TCP_CLOSE) && | |
142 | !atomic_read(&sk->sk_rmem_alloc)) { | |
c93f87c7 MC |
143 | ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_state_change: " |
144 | "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
7ba24713 AA |
145 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
146 | } | |
147 | ||
5bb0b55a | 148 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
149 | tcp_sw_conn = tcp_conn->dd_data; |
150 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
151 | |
152 | read_unlock(&sk->sk_callback_lock); | |
153 | ||
154 | old_state_change(sk); | |
155 | } | |
156 | ||
157 | /** | |
158 | * iscsi_write_space - Called when more output buffer space is available | |
159 | * @sk: socket space is available for | |
160 | **/ | |
38e1a8f5 | 161 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 AA |
162 | { |
163 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a | 164 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 165 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a | 166 | |
38e1a8f5 | 167 | tcp_sw_conn->old_write_space(sk); |
c93f87c7 | 168 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 169 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
170 | } |
171 | ||
38e1a8f5 | 172 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 173 | { |
5bb0b55a | 174 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
175 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
176 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
177 | |
178 | /* assign new callbacks */ | |
179 | write_lock_bh(&sk->sk_callback_lock); | |
180 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
181 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
182 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
183 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
184 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
185 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
186 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
187 | write_unlock_bh(&sk->sk_callback_lock); |
188 | } | |
189 | ||
38e1a8f5 MC |
190 | static void |
191 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn) | |
7ba24713 | 192 | { |
38e1a8f5 | 193 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
194 | |
195 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
196 | write_lock_bh(&sk->sk_callback_lock); | |
197 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
198 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
199 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
200 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
7ba24713 AA |
201 | sk->sk_no_check = 0; |
202 | write_unlock_bh(&sk->sk_callback_lock); | |
203 | } | |
204 | ||
205 | /** | |
38e1a8f5 | 206 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 207 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
208 | * @segment: the buffer to transmnit |
209 | * | |
210 | * This function transmits as much of the buffer as | |
211 | * the network layer will accept, and returns the number of | |
212 | * bytes transmitted. | |
213 | * | |
214 | * If CRC hashing is enabled, the function will compute the | |
215 | * hash as it goes. When the entire segment has been transmitted, | |
216 | * it will retrieve the hash value and send it as well. | |
217 | */ | |
6df19a79 | 218 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
219 | struct iscsi_segment *segment) |
220 | { | |
6df19a79 | 221 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
222 | struct socket *sk = tcp_sw_conn->sock; |
223 | unsigned int copied = 0; | |
224 | int r = 0; | |
225 | ||
6df19a79 | 226 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
227 | struct scatterlist *sg; |
228 | unsigned int offset, copy; | |
229 | int flags = 0; | |
230 | ||
231 | r = 0; | |
232 | offset = segment->copied; | |
233 | copy = segment->size - offset; | |
234 | ||
235 | if (segment->total_copied + segment->size < segment->total_size) | |
236 | flags |= MSG_MORE; | |
237 | ||
238 | /* Use sendpage if we can; else fall back to sendmsg */ | |
239 | if (!segment->data) { | |
240 | sg = segment->sg; | |
241 | offset += segment->sg_offset + sg->offset; | |
242 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
243 | copy, flags); | |
244 | } else { | |
245 | struct msghdr msg = { .msg_flags = flags }; | |
246 | struct kvec iov = { | |
247 | .iov_base = segment->data + offset, | |
248 | .iov_len = copy | |
249 | }; | |
250 | ||
251 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
252 | } | |
253 | ||
254 | if (r < 0) { | |
255 | iscsi_tcp_segment_unmap(segment); | |
256 | if (copied || r == -EAGAIN) | |
257 | break; | |
258 | return r; | |
259 | } | |
260 | copied += r; | |
261 | } | |
262 | return copied; | |
263 | } | |
264 | ||
265 | /** | |
266 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 267 | **/ |
38e1a8f5 | 268 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 269 | { |
5bb0b55a | 270 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
271 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
272 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
273 | unsigned int consumed = 0; |
274 | int rc = 0; | |
7ba24713 | 275 | |
a8ac6311 | 276 | while (1) { |
6df19a79 | 277 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
6f481e3c MC |
278 | if (rc < 0) { |
279 | rc = ISCSI_ERR_XMIT_FAILED; | |
a8ac6311 | 280 | goto error; |
6f481e3c | 281 | } |
a8ac6311 OK |
282 | if (rc == 0) |
283 | break; | |
284 | ||
285 | consumed += rc; | |
286 | ||
287 | if (segment->total_copied >= segment->total_size) { | |
288 | if (segment->done != NULL) { | |
289 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 290 | if (rc != 0) |
a8ac6311 OK |
291 | goto error; |
292 | } | |
293 | } | |
3219e529 MC |
294 | } |
295 | ||
c93f87c7 | 296 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
297 | |
298 | conn->txdata_octets += consumed; | |
299 | return consumed; | |
300 | ||
301 | error: | |
302 | /* Transmit error. We could initiate error recovery | |
303 | * here. */ | |
c93f87c7 | 304 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
305 | iscsi_conn_failure(conn, rc); |
306 | return -EIO; | |
7ba24713 AA |
307 | } |
308 | ||
309 | /** | |
a8ac6311 OK |
310 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
311 | */ | |
38e1a8f5 | 312 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 313 | { |
a8ac6311 | 314 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
315 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
316 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 317 | |
a8ac6311 | 318 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
319 | } |
320 | ||
38e1a8f5 | 321 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 322 | { |
e5a7efef | 323 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
324 | int rc; |
325 | ||
38e1a8f5 MC |
326 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
327 | rc = iscsi_sw_tcp_xmit(conn); | |
a8ac6311 | 328 | if (rc == 0) |
7ba24713 | 329 | return -EAGAIN; |
a8ac6311 OK |
330 | if (rc < 0) |
331 | return rc; | |
3219e529 | 332 | } |
7ba24713 | 333 | |
a8ac6311 | 334 | return 0; |
7ba24713 AA |
335 | } |
336 | ||
a8ac6311 OK |
337 | /* |
338 | * This is called when we're done sending the header. | |
339 | * Simply copy the data_segment to the send segment, and return. | |
340 | */ | |
38e1a8f5 MC |
341 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
342 | struct iscsi_segment *segment) | |
7ba24713 | 343 | { |
38e1a8f5 MC |
344 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
345 | ||
346 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
347 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
348 | "Header done. Next segment size %u total_size %u\n", | |
349 | tcp_sw_conn->out.segment.size, | |
350 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
351 | return 0; |
352 | } | |
353 | ||
38e1a8f5 MC |
354 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
355 | size_t hdrlen) | |
a8ac6311 OK |
356 | { |
357 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 358 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 359 | |
c93f87c7 MC |
360 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
361 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
362 | |
363 | /* Clear the data segment - needs to be filled in by the | |
364 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
365 | memset(&tcp_sw_conn->out.data_segment, 0, |
366 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
367 | |
368 | /* If header digest is enabled, compute the CRC and | |
369 | * place the digest into the same buffer. We make | |
135a8ad4 | 370 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
371 | * sufficient room. |
372 | */ | |
373 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 374 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
375 | hdr + hdrlen); |
376 | hdrlen += ISCSI_DIGEST_SIZE; | |
377 | } | |
378 | ||
379 | /* Remember header pointer for later, when we need | |
380 | * to decide whether there's a payload to go along | |
381 | * with the header. */ | |
38e1a8f5 | 382 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 383 | |
38e1a8f5 MC |
384 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
385 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
386 | } |
387 | ||
388 | /* | |
389 | * Prepare the send buffer for the payload data. | |
390 | * Padding and checksumming will all be taken care | |
391 | * of by the iscsi_segment routines. | |
392 | */ | |
393 | static int | |
38e1a8f5 MC |
394 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
395 | unsigned int count, unsigned int offset, | |
396 | unsigned int len) | |
a8ac6311 OK |
397 | { |
398 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 399 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
400 | struct hash_desc *tx_hash = NULL; |
401 | unsigned int hdr_spec_len; | |
402 | ||
c93f87c7 MC |
403 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
404 | conn->datadgst_en ? | |
405 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
406 | |
407 | /* Make sure the datalen matches what the caller | |
408 | said he would send. */ | |
38e1a8f5 | 409 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
410 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
411 | ||
412 | if (conn->datadgst_en) | |
38e1a8f5 | 413 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 414 | |
38e1a8f5 MC |
415 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
416 | sg, count, offset, len, | |
417 | NULL, tx_hash); | |
a8ac6311 OK |
418 | } |
419 | ||
420 | static void | |
38e1a8f5 | 421 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
422 | size_t len) |
423 | { | |
424 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 425 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
426 | struct hash_desc *tx_hash = NULL; |
427 | unsigned int hdr_spec_len; | |
428 | ||
c93f87c7 MC |
429 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
430 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
431 | |
432 | /* Make sure the datalen matches what the caller | |
433 | said he would send. */ | |
38e1a8f5 | 434 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
435 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
436 | ||
437 | if (conn->datadgst_en) | |
38e1a8f5 | 438 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 439 | |
38e1a8f5 | 440 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 441 | data, len, NULL, tx_hash); |
7ba24713 AA |
442 | } |
443 | ||
38e1a8f5 MC |
444 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
445 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
446 | { |
447 | struct iscsi_conn *conn = task->conn; | |
448 | int err = 0; | |
449 | ||
38e1a8f5 | 450 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
451 | |
452 | if (!count) | |
453 | return 0; | |
454 | ||
455 | if (!task->sc) | |
38e1a8f5 | 456 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
457 | else { |
458 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
459 | ||
38e1a8f5 MC |
460 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
461 | sdb->table.nents, offset, | |
462 | count); | |
e5a7efef MC |
463 | } |
464 | ||
465 | if (err) { | |
9a6510eb | 466 | /* got invalid offset/len */ |
e5a7efef MC |
467 | return -EIO; |
468 | } | |
469 | return 0; | |
470 | } | |
471 | ||
2ff79d52 | 472 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 473 | { |
135a8ad4 | 474 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 475 | |
38e1a8f5 MC |
476 | task->hdr = task->dd_data + sizeof(*tcp_task); |
477 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 478 | return 0; |
7ba24713 AA |
479 | } |
480 | ||
5bb0b55a | 481 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
482 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
483 | uint32_t conn_idx) | |
7ba24713 | 484 | { |
5bb0b55a MC |
485 | struct iscsi_conn *conn; |
486 | struct iscsi_cls_conn *cls_conn; | |
487 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 488 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 489 | |
38e1a8f5 MC |
490 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
491 | conn_idx); | |
5bb0b55a MC |
492 | if (!cls_conn) |
493 | return NULL; | |
494 | conn = cls_conn->dd_data; | |
5d91e209 | 495 | tcp_conn = conn->dd_data; |
38e1a8f5 | 496 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 497 | |
38e1a8f5 MC |
498 | tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
499 | CRYPTO_ALG_ASYNC); | |
500 | tcp_sw_conn->tx_hash.flags = 0; | |
501 | if (IS_ERR(tcp_sw_conn->tx_hash.tfm)) | |
5d91e209 | 502 | goto free_conn; |
dd8c0d95 | 503 | |
38e1a8f5 MC |
504 | tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
505 | CRYPTO_ALG_ASYNC); | |
506 | tcp_sw_conn->rx_hash.flags = 0; | |
507 | if (IS_ERR(tcp_sw_conn->rx_hash.tfm)) | |
dd8c0d95 | 508 | goto free_tx_tfm; |
38e1a8f5 | 509 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 510 | |
5bb0b55a | 511 | return cls_conn; |
7ba24713 | 512 | |
dd8c0d95 | 513 | free_tx_tfm: |
38e1a8f5 | 514 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 515 | free_conn: |
322d739d MC |
516 | iscsi_conn_printk(KERN_ERR, conn, |
517 | "Could not create connection due to crc32c " | |
518 | "loading error. Make sure the crc32c " | |
519 | "module is built as a module or into the " | |
520 | "kernel\n"); | |
38e1a8f5 | 521 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 522 | return NULL; |
7ba24713 AA |
523 | } |
524 | ||
38e1a8f5 | 525 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 526 | { |
22236961 | 527 | struct iscsi_session *session = conn->session; |
1c83469d | 528 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
529 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
530 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 531 | |
22236961 | 532 | if (!sock) |
1c83469d MC |
533 | return; |
534 | ||
22236961 | 535 | sock_hold(sock->sk); |
38e1a8f5 | 536 | iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn); |
22236961 | 537 | sock_put(sock->sk); |
1c83469d | 538 | |
22236961 | 539 | spin_lock_bh(&session->lock); |
38e1a8f5 | 540 | tcp_sw_conn->sock = NULL; |
22236961 MC |
541 | spin_unlock_bh(&session->lock); |
542 | sockfd_put(sock); | |
1c83469d MC |
543 | } |
544 | ||
38e1a8f5 | 545 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 546 | { |
5bb0b55a MC |
547 | struct iscsi_conn *conn = cls_conn->dd_data; |
548 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 549 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 550 | |
38e1a8f5 | 551 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 552 | |
38e1a8f5 MC |
553 | if (tcp_sw_conn->tx_hash.tfm) |
554 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); | |
555 | if (tcp_sw_conn->rx_hash.tfm) | |
556 | crypto_free_hash(tcp_sw_conn->rx_hash.tfm); | |
7ba24713 | 557 | |
38e1a8f5 | 558 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 559 | } |
7ba24713 | 560 | |
38e1a8f5 | 561 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
562 | { |
563 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 564 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 565 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
913e5bf4 MC |
566 | |
567 | /* userspace may have goofed up and not bound us */ | |
38e1a8f5 | 568 | if (!tcp_sw_conn->sock) |
913e5bf4 MC |
569 | return; |
570 | /* | |
571 | * Make sure our recv side is stopped. | |
572 | * Older tools called conn stop before ep_disconnect | |
573 | * so IO could still be coming in. | |
574 | */ | |
38e1a8f5 | 575 | write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
913e5bf4 | 576 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
38e1a8f5 | 577 | write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
1c83469d MC |
578 | |
579 | iscsi_conn_stop(cls_conn, flag); | |
38e1a8f5 | 580 | iscsi_sw_tcp_release_conn(conn); |
1c83469d MC |
581 | } |
582 | ||
38e1a8f5 MC |
583 | static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
584 | char *buf, int *port, | |
585 | int (*getname)(struct socket *, | |
586 | struct sockaddr *, | |
587 | int *addrlen)) | |
22236961 MC |
588 | { |
589 | struct sockaddr_storage *addr; | |
590 | struct sockaddr_in6 *sin6; | |
591 | struct sockaddr_in *sin; | |
592 | int rc = 0, len; | |
593 | ||
a9204879 | 594 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
595 | if (!addr) |
596 | return -ENOMEM; | |
597 | ||
598 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
599 | rc = -ENODEV; | |
600 | goto free_addr; | |
601 | } | |
602 | ||
603 | switch (addr->ss_family) { | |
604 | case AF_INET: | |
605 | sin = (struct sockaddr_in *)addr; | |
606 | spin_lock_bh(&conn->session->lock); | |
63779436 | 607 | sprintf(buf, "%pI4", &sin->sin_addr.s_addr); |
22236961 MC |
608 | *port = be16_to_cpu(sin->sin_port); |
609 | spin_unlock_bh(&conn->session->lock); | |
610 | break; | |
611 | case AF_INET6: | |
612 | sin6 = (struct sockaddr_in6 *)addr; | |
613 | spin_lock_bh(&conn->session->lock); | |
5b095d98 | 614 | sprintf(buf, "%pI6", &sin6->sin6_addr); |
22236961 MC |
615 | *port = be16_to_cpu(sin6->sin6_port); |
616 | spin_unlock_bh(&conn->session->lock); | |
617 | break; | |
618 | } | |
619 | free_addr: | |
620 | kfree(addr); | |
621 | return rc; | |
622 | } | |
623 | ||
5bb0b55a | 624 | static int |
38e1a8f5 MC |
625 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
626 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
627 | int is_leading) | |
5bb0b55a | 628 | { |
75613521 MC |
629 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
630 | struct iscsi_host *ihost = shost_priv(shost); | |
5bb0b55a MC |
631 | struct iscsi_conn *conn = cls_conn->dd_data; |
632 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 633 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
634 | struct sock *sk; |
635 | struct socket *sock; | |
636 | int err; | |
7ba24713 | 637 | |
5bb0b55a | 638 | /* lookup for existing socket */ |
264faaaa | 639 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 640 | if (!sock) { |
322d739d MC |
641 | iscsi_conn_printk(KERN_ERR, conn, |
642 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 643 | return -EEXIST; |
7ba24713 | 644 | } |
22236961 MC |
645 | /* |
646 | * copy these values now because if we drop the session | |
647 | * userspace may still want to query the values since we will | |
648 | * be using them for the reconnect | |
649 | */ | |
38e1a8f5 MC |
650 | err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address, |
651 | &conn->portal_port, kernel_getpeername); | |
22236961 MC |
652 | if (err) |
653 | goto free_socket; | |
654 | ||
38e1a8f5 MC |
655 | err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address, |
656 | &ihost->local_port, kernel_getsockname); | |
22236961 MC |
657 | if (err) |
658 | goto free_socket; | |
7ba24713 | 659 | |
5bb0b55a MC |
660 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
661 | if (err) | |
22236961 | 662 | goto free_socket; |
7ba24713 | 663 | |
67a61114 | 664 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 665 | tcp_sw_conn->sock = sock; |
7ba24713 | 666 | |
67a61114 MC |
667 | /* setup Socket parameters */ |
668 | sk = sock->sk; | |
669 | sk->sk_reuse = 1; | |
670 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
671 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 672 | |
38e1a8f5 MC |
673 | iscsi_sw_tcp_conn_set_callbacks(conn); |
674 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
675 | /* |
676 | * set receive state machine into initial state | |
677 | */ | |
da32dd68 | 678 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 679 | return 0; |
22236961 MC |
680 | |
681 | free_socket: | |
682 | sockfd_put(sock); | |
683 | return err; | |
7ba24713 AA |
684 | } |
685 | ||
38e1a8f5 MC |
686 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
687 | enum iscsi_param param, char *buf, | |
688 | int buflen) | |
7ba24713 | 689 | { |
7b7232f3 | 690 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 691 | struct iscsi_session *session = conn->session; |
5bb0b55a | 692 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 693 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5c75b7fc | 694 | int value; |
7ba24713 | 695 | |
7ba24713 | 696 | switch(param) { |
7ba24713 | 697 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 698 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
699 | break; |
700 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 701 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
702 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
703 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 704 | break; |
7ba24713 | 705 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 706 | sscanf(buf, "%d", &value); |
df93ffcd MC |
707 | if (value <= 0 || !is_power_of_2(value)) |
708 | return -EINVAL; | |
709 | if (session->max_r2t == value) | |
7ba24713 | 710 | break; |
38e1a8f5 | 711 | iscsi_tcp_r2tpool_free(session); |
5c75b7fc | 712 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 | 713 | if (iscsi_tcp_r2tpool_alloc(session)) |
7ba24713 AA |
714 | return -ENOMEM; |
715 | break; | |
7ba24713 | 716 | default: |
5c75b7fc | 717 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
718 | } |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
38e1a8f5 MC |
723 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
724 | enum iscsi_param param, char *buf) | |
7b8631b5 | 725 | { |
7b7232f3 | 726 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 727 | int len; |
7b8631b5 MC |
728 | |
729 | switch(param) { | |
fd7255f5 | 730 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
731 | spin_lock_bh(&conn->session->lock); |
732 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
733 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 734 | break; |
fd7255f5 | 735 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
736 | spin_lock_bh(&conn->session->lock); |
737 | len = sprintf(buf, "%s\n", conn->portal_address); | |
738 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
739 | break; |
740 | default: | |
5c75b7fc | 741 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
742 | } |
743 | ||
744 | return len; | |
745 | } | |
746 | ||
7ba24713 | 747 | static void |
38e1a8f5 MC |
748 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
749 | struct iscsi_stats *stats) | |
7ba24713 | 750 | { |
7b7232f3 | 751 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 752 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 753 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 754 | |
7ba24713 AA |
755 | stats->custom_length = 3; |
756 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 757 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 758 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 759 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
760 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
761 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
762 | |
763 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
764 | } |
765 | ||
5bb0b55a | 766 | static struct iscsi_cls_session * |
38e1a8f5 | 767 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 768 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 769 | { |
5bb0b55a MC |
770 | struct iscsi_cls_session *cls_session; |
771 | struct iscsi_session *session; | |
06520ede | 772 | struct Scsi_Host *shost; |
7ba24713 | 773 | |
06520ede MC |
774 | if (ep) { |
775 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
776 | return NULL; |
777 | } | |
778 | ||
4d108350 | 779 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1); |
75613521 | 780 | if (!shost) |
5bb0b55a | 781 | return NULL; |
38e1a8f5 | 782 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 783 | shost->cmd_per_lun = qdepth; |
75613521 MC |
784 | shost->max_lun = iscsi_max_lun; |
785 | shost->max_id = 0; | |
786 | shost->max_channel = 0; | |
30e9ba9f | 787 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 788 | |
a4804cd6 | 789 | if (iscsi_host_add(shost, NULL)) |
75613521 | 790 | goto free_host; |
75613521 | 791 | |
38e1a8f5 MC |
792 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
793 | cmds_max, | |
794 | sizeof(struct iscsi_tcp_task) + | |
795 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 796 | initial_cmdsn, 0); |
75613521 MC |
797 | if (!cls_session) |
798 | goto remove_host; | |
799 | session = cls_session->dd_data; | |
7ba24713 | 800 | |
fbc514b4 | 801 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 802 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 803 | goto remove_session; |
5bb0b55a MC |
804 | return cls_session; |
805 | ||
75613521 | 806 | remove_session: |
5bb0b55a | 807 | iscsi_session_teardown(cls_session); |
75613521 | 808 | remove_host: |
a4804cd6 | 809 | iscsi_host_remove(shost); |
75613521 | 810 | free_host: |
a4804cd6 | 811 | iscsi_host_free(shost); |
5bb0b55a MC |
812 | return NULL; |
813 | } | |
814 | ||
38e1a8f5 | 815 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 816 | { |
75613521 MC |
817 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
818 | ||
38e1a8f5 | 819 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 820 | iscsi_session_teardown(cls_session); |
75613521 | 821 | |
a4804cd6 MC |
822 | iscsi_host_remove(shost); |
823 | iscsi_host_free(shost); | |
7ba24713 AA |
824 | } |
825 | ||
091e6dbe PW |
826 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
827 | { | |
828 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
829 | return 0; | |
830 | } | |
831 | ||
38e1a8f5 | 832 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 833 | { |
b6d44fe9 | 834 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
835 | blk_queue_dma_alignment(sdev->request_queue, 0); |
836 | return 0; | |
837 | } | |
838 | ||
38e1a8f5 | 839 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 840 | .module = THIS_MODULE, |
f4246b33 | 841 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
842 | .queuecommand = iscsi_queuecommand, |
843 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 844 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 845 | .sg_tablesize = 4096, |
8231f0ed | 846 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
847 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
848 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 849 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 850 | .eh_target_reset_handler= iscsi_eh_target_reset, |
5bb0b55a | 851 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 852 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 853 | .slave_configure = iscsi_sw_tcp_slave_configure, |
5bb0b55a MC |
854 | .proc_name = "iscsi_tcp", |
855 | .this_id = -1, | |
856 | }; | |
857 | ||
38e1a8f5 | 858 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
859 | .owner = THIS_MODULE, |
860 | .name = "tcp", | |
861 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
862 | | CAP_DATADGST, | |
fd7255f5 MC |
863 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
864 | ISCSI_MAX_XMIT_DLENGTH | | |
865 | ISCSI_HDRDGST_EN | | |
866 | ISCSI_DATADGST_EN | | |
867 | ISCSI_INITIAL_R2T_EN | | |
868 | ISCSI_MAX_R2T | | |
869 | ISCSI_IMM_DATA_EN | | |
870 | ISCSI_FIRST_BURST | | |
871 | ISCSI_MAX_BURST | | |
872 | ISCSI_PDU_INORDER_EN | | |
873 | ISCSI_DATASEQ_INORDER_EN | | |
874 | ISCSI_ERL | | |
875 | ISCSI_CONN_PORT | | |
8d2860b3 | 876 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
877 | ISCSI_EXP_STATSN | |
878 | ISCSI_PERSISTENT_PORT | | |
879 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
880 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
881 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 882 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c MC |
883 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
884 | ISCSI_LU_RESET_TMO | | |
88dfd340 MC |
885 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
886 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
22236961 | 887 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
888 | ISCSI_HOST_INITIATOR_NAME | |
889 | ISCSI_HOST_NETDEV_NAME, | |
5bb0b55a | 890 | /* session management */ |
38e1a8f5 MC |
891 | .create_session = iscsi_sw_tcp_session_create, |
892 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 893 | /* connection management */ |
38e1a8f5 MC |
894 | .create_conn = iscsi_sw_tcp_conn_create, |
895 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
896 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
897 | .set_param = iscsi_sw_tcp_conn_set_param, | |
898 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 899 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 900 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 901 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 902 | /* iscsi host params */ |
75613521 | 903 | .get_host_param = iscsi_host_get_param, |
0801c242 | 904 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 905 | /* IO */ |
7ba24713 | 906 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 907 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 908 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
909 | .init_task = iscsi_tcp_task_init, |
910 | .xmit_task = iscsi_tcp_task_xmit, | |
911 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 912 | /* low level pdu helpers */ |
38e1a8f5 MC |
913 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
914 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
915 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 916 | /* recovery */ |
30a6c652 | 917 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
918 | }; |
919 | ||
38e1a8f5 | 920 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 921 | { |
7ba24713 | 922 | if (iscsi_max_lun < 1) { |
be2df72e OG |
923 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
924 | iscsi_max_lun); | |
7ba24713 AA |
925 | return -EINVAL; |
926 | } | |
7ba24713 | 927 | |
38e1a8f5 MC |
928 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
929 | &iscsi_sw_tcp_transport); | |
930 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 931 | return -ENODEV; |
7ba24713 | 932 | |
7b8631b5 | 933 | return 0; |
7ba24713 AA |
934 | } |
935 | ||
38e1a8f5 | 936 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 937 | { |
38e1a8f5 | 938 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
939 | } |
940 | ||
38e1a8f5 MC |
941 | module_init(iscsi_sw_tcp_init); |
942 | module_exit(iscsi_sw_tcp_exit); |