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 | ||
523eeac6 HR |
102 | /** |
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 | */ | |
110 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
111 | { | |
d1af8a32 | 112 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; |
523eeac6 | 113 | |
d1af8a32 MC |
114 | 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 | } | |
523eeac6 HR |
120 | return 0; |
121 | } | |
122 | ||
38e1a8f5 | 123 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 AA |
124 | { |
125 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 126 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
127 | read_descriptor_t rd_desc; |
128 | ||
129 | read_lock(&sk->sk_callback_lock); | |
130 | ||
665b44ae | 131 | /* |
da32dd68 | 132 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 133 | * We set count to 1 because we want the network layer to |
da32dd68 | 134 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
135 | * handled pdus that cross buffers or pdus that still need data. |
136 | */ | |
7ba24713 | 137 | rd_desc.arg.data = conn; |
665b44ae | 138 | rd_desc.count = 1; |
38e1a8f5 | 139 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 140 | |
d1af8a32 | 141 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 142 | |
7ba24713 | 143 | read_unlock(&sk->sk_callback_lock); |
da32dd68 OK |
144 | |
145 | /* If we had to (atomically) map a highmem page, | |
146 | * unmap it now. */ | |
a8ac6311 | 147 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7ba24713 AA |
148 | } |
149 | ||
38e1a8f5 | 150 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 151 | { |
5bb0b55a | 152 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 153 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 AA |
154 | struct iscsi_conn *conn; |
155 | struct iscsi_session *session; | |
156 | void (*old_state_change)(struct sock *); | |
157 | ||
158 | read_lock(&sk->sk_callback_lock); | |
159 | ||
160 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
161 | session = conn->session; | |
162 | ||
d1af8a32 | 163 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 164 | |
5bb0b55a | 165 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
166 | tcp_sw_conn = tcp_conn->dd_data; |
167 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
168 | |
169 | read_unlock(&sk->sk_callback_lock); | |
170 | ||
171 | old_state_change(sk); | |
172 | } | |
173 | ||
174 | /** | |
175 | * iscsi_write_space - Called when more output buffer space is available | |
176 | * @sk: socket space is available for | |
177 | **/ | |
38e1a8f5 | 178 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 AA |
179 | { |
180 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a | 181 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 182 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a | 183 | |
38e1a8f5 | 184 | tcp_sw_conn->old_write_space(sk); |
c93f87c7 | 185 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 186 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
187 | } |
188 | ||
38e1a8f5 | 189 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 190 | { |
5bb0b55a | 191 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
192 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
193 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
194 | |
195 | /* assign new callbacks */ | |
196 | write_lock_bh(&sk->sk_callback_lock); | |
197 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
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; | |
7ba24713 AA |
204 | write_unlock_bh(&sk->sk_callback_lock); |
205 | } | |
206 | ||
38e1a8f5 MC |
207 | static void |
208 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn) | |
7ba24713 | 209 | { |
38e1a8f5 | 210 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
211 | |
212 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
213 | write_lock_bh(&sk->sk_callback_lock); | |
214 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
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; | |
7ba24713 AA |
218 | sk->sk_no_check = 0; |
219 | write_unlock_bh(&sk->sk_callback_lock); | |
220 | } | |
221 | ||
222 | /** | |
38e1a8f5 | 223 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 224 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
225 | * @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 | */ | |
6df19a79 | 235 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
236 | struct iscsi_segment *segment) |
237 | { | |
6df19a79 | 238 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
239 | struct socket *sk = tcp_sw_conn->sock; |
240 | unsigned int copied = 0; | |
241 | int r = 0; | |
242 | ||
6df19a79 | 243 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
244 | 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; | |
259 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
260 | copy, flags); | |
261 | } 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); | |
38e1a8f5 MC |
273 | return r; |
274 | } | |
275 | copied += r; | |
276 | } | |
277 | return copied; | |
278 | } | |
279 | ||
280 | /** | |
281 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 282 | **/ |
38e1a8f5 | 283 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 284 | { |
5bb0b55a | 285 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
286 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
287 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
288 | unsigned int consumed = 0; |
289 | int rc = 0; | |
7ba24713 | 290 | |
a8ac6311 | 291 | while (1) { |
6df19a79 | 292 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
293 | /* |
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) { | |
6f481e3c | 301 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 302 | goto error; |
32382492 | 303 | } else if (rc == 0) |
a8ac6311 OK |
304 | 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); | |
6f481e3c | 311 | if (rc != 0) |
a8ac6311 OK |
312 | goto error; |
313 | } | |
314 | } | |
3219e529 MC |
315 | } |
316 | ||
c93f87c7 | 317 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
318 | |
319 | conn->txdata_octets += consumed; | |
320 | return consumed; | |
321 | ||
322 | error: | |
323 | /* Transmit error. We could initiate error recovery | |
324 | * here. */ | |
c93f87c7 | 325 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
326 | iscsi_conn_failure(conn, rc); |
327 | return -EIO; | |
7ba24713 AA |
328 | } |
329 | ||
330 | /** | |
a8ac6311 OK |
331 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
332 | */ | |
38e1a8f5 | 333 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 334 | { |
a8ac6311 | 335 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
336 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
337 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 338 | |
a8ac6311 | 339 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
340 | } |
341 | ||
38e1a8f5 | 342 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 343 | { |
e5a7efef | 344 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
345 | int rc; |
346 | ||
38e1a8f5 MC |
347 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
348 | rc = iscsi_sw_tcp_xmit(conn); | |
a8ac6311 | 349 | if (rc == 0) |
7ba24713 | 350 | return -EAGAIN; |
a8ac6311 OK |
351 | if (rc < 0) |
352 | return rc; | |
3219e529 | 353 | } |
7ba24713 | 354 | |
a8ac6311 | 355 | return 0; |
7ba24713 AA |
356 | } |
357 | ||
a8ac6311 OK |
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 | */ | |
38e1a8f5 MC |
362 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
363 | struct iscsi_segment *segment) | |
7ba24713 | 364 | { |
38e1a8f5 MC |
365 | 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; | |
c93f87c7 MC |
368 | 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); | |
a8ac6311 OK |
372 | return 0; |
373 | } | |
374 | ||
38e1a8f5 MC |
375 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
376 | size_t hdrlen) | |
a8ac6311 OK |
377 | { |
378 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 379 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 380 | |
c93f87c7 MC |
381 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
382 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
383 | |
384 | /* Clear the data segment - needs to be filled in by the | |
385 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
386 | memset(&tcp_sw_conn->out.data_segment, 0, |
387 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
388 | |
389 | /* If header digest is enabled, compute the CRC and | |
390 | * place the digest into the same buffer. We make | |
135a8ad4 | 391 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
392 | * sufficient room. |
393 | */ | |
394 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 395 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
396 | hdr + hdrlen); |
397 | hdrlen += ISCSI_DIGEST_SIZE; | |
398 | } | |
399 | ||
400 | /* Remember header pointer for later, when we need | |
401 | * to decide whether there's a payload to go along | |
402 | * with the header. */ | |
38e1a8f5 | 403 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 404 | |
38e1a8f5 MC |
405 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
406 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
407 | } |
408 | ||
409 | /* | |
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 | */ | |
414 | static int | |
38e1a8f5 MC |
415 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
416 | unsigned int count, unsigned int offset, | |
417 | unsigned int len) | |
a8ac6311 OK |
418 | { |
419 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 420 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
421 | struct hash_desc *tx_hash = NULL; |
422 | unsigned int hdr_spec_len; | |
423 | ||
c93f87c7 MC |
424 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
425 | conn->datadgst_en ? | |
426 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
427 | |
428 | /* Make sure the datalen matches what the caller | |
429 | said he would send. */ | |
38e1a8f5 | 430 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
431 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
432 | ||
433 | if (conn->datadgst_en) | |
38e1a8f5 | 434 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 435 | |
38e1a8f5 MC |
436 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
437 | sg, count, offset, len, | |
438 | NULL, tx_hash); | |
a8ac6311 OK |
439 | } |
440 | ||
441 | static void | |
38e1a8f5 | 442 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
443 | size_t len) |
444 | { | |
445 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 446 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
447 | struct hash_desc *tx_hash = NULL; |
448 | unsigned int hdr_spec_len; | |
449 | ||
c93f87c7 MC |
450 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
451 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
452 | |
453 | /* Make sure the datalen matches what the caller | |
454 | said he would send. */ | |
38e1a8f5 | 455 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
456 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
457 | ||
458 | if (conn->datadgst_en) | |
38e1a8f5 | 459 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 460 | |
38e1a8f5 | 461 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 462 | data, len, NULL, tx_hash); |
7ba24713 AA |
463 | } |
464 | ||
38e1a8f5 MC |
465 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
466 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
467 | { |
468 | struct iscsi_conn *conn = task->conn; | |
469 | int err = 0; | |
470 | ||
38e1a8f5 | 471 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
472 | |
473 | if (!count) | |
474 | return 0; | |
475 | ||
476 | if (!task->sc) | |
38e1a8f5 | 477 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
478 | else { |
479 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
480 | ||
38e1a8f5 MC |
481 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
482 | sdb->table.nents, offset, | |
483 | count); | |
e5a7efef MC |
484 | } |
485 | ||
486 | if (err) { | |
9a6510eb | 487 | /* got invalid offset/len */ |
e5a7efef MC |
488 | return -EIO; |
489 | } | |
490 | return 0; | |
491 | } | |
492 | ||
2ff79d52 | 493 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 494 | { |
135a8ad4 | 495 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 496 | |
38e1a8f5 MC |
497 | task->hdr = task->dd_data + sizeof(*tcp_task); |
498 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 499 | return 0; |
7ba24713 AA |
500 | } |
501 | ||
5bb0b55a | 502 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
503 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
504 | uint32_t conn_idx) | |
7ba24713 | 505 | { |
5bb0b55a MC |
506 | struct iscsi_conn *conn; |
507 | struct iscsi_cls_conn *cls_conn; | |
508 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 509 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 510 | |
38e1a8f5 MC |
511 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
512 | conn_idx); | |
5bb0b55a MC |
513 | if (!cls_conn) |
514 | return NULL; | |
515 | conn = cls_conn->dd_data; | |
5d91e209 | 516 | tcp_conn = conn->dd_data; |
38e1a8f5 | 517 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 518 | |
38e1a8f5 MC |
519 | 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)) | |
5d91e209 | 523 | goto free_conn; |
dd8c0d95 | 524 | |
38e1a8f5 MC |
525 | 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)) | |
dd8c0d95 | 529 | goto free_tx_tfm; |
38e1a8f5 | 530 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 531 | |
5bb0b55a | 532 | return cls_conn; |
7ba24713 | 533 | |
dd8c0d95 | 534 | free_tx_tfm: |
38e1a8f5 | 535 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 536 | free_conn: |
322d739d MC |
537 | 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"); | |
38e1a8f5 | 542 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 543 | return NULL; |
7ba24713 AA |
544 | } |
545 | ||
38e1a8f5 | 546 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 547 | { |
22236961 | 548 | struct iscsi_session *session = conn->session; |
1c83469d | 549 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
550 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
551 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 552 | |
22236961 | 553 | if (!sock) |
1c83469d MC |
554 | return; |
555 | ||
22236961 | 556 | sock_hold(sock->sk); |
38e1a8f5 | 557 | iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn); |
22236961 | 558 | sock_put(sock->sk); |
1c83469d | 559 | |
22236961 | 560 | spin_lock_bh(&session->lock); |
38e1a8f5 | 561 | tcp_sw_conn->sock = NULL; |
22236961 MC |
562 | spin_unlock_bh(&session->lock); |
563 | sockfd_put(sock); | |
1c83469d MC |
564 | } |
565 | ||
38e1a8f5 | 566 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 567 | { |
5bb0b55a MC |
568 | struct iscsi_conn *conn = cls_conn->dd_data; |
569 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 570 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 571 | |
38e1a8f5 | 572 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 573 | |
38e1a8f5 MC |
574 | 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); | |
7ba24713 | 578 | |
38e1a8f5 | 579 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 580 | } |
7ba24713 | 581 | |
38e1a8f5 | 582 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
583 | { |
584 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 585 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 586 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
913e5bf4 MC |
587 | |
588 | /* userspace may have goofed up and not bound us */ | |
38e1a8f5 | 589 | if (!tcp_sw_conn->sock) |
913e5bf4 MC |
590 | 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 | */ | |
38e1a8f5 | 596 | write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
913e5bf4 | 597 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
38e1a8f5 | 598 | write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
1c83469d MC |
599 | |
600 | iscsi_conn_stop(cls_conn, flag); | |
38e1a8f5 | 601 | iscsi_sw_tcp_release_conn(conn); |
1c83469d MC |
602 | } |
603 | ||
38e1a8f5 MC |
604 | static 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)) | |
22236961 MC |
609 | { |
610 | struct sockaddr_storage *addr; | |
611 | struct sockaddr_in6 *sin6; | |
612 | struct sockaddr_in *sin; | |
613 | int rc = 0, len; | |
614 | ||
a9204879 | 615 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
616 | 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); | |
63779436 | 628 | sprintf(buf, "%pI4", &sin->sin_addr.s_addr); |
22236961 MC |
629 | *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); | |
5b095d98 | 635 | sprintf(buf, "%pI6", &sin6->sin6_addr); |
22236961 MC |
636 | *port = be16_to_cpu(sin6->sin6_port); |
637 | spin_unlock_bh(&conn->session->lock); | |
638 | break; | |
639 | } | |
640 | free_addr: | |
641 | kfree(addr); | |
642 | return rc; | |
643 | } | |
644 | ||
5bb0b55a | 645 | static int |
38e1a8f5 MC |
646 | iscsi_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) | |
5bb0b55a | 649 | { |
75613521 MC |
650 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
651 | struct iscsi_host *ihost = shost_priv(shost); | |
5bb0b55a MC |
652 | struct iscsi_conn *conn = cls_conn->dd_data; |
653 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 654 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
655 | struct sock *sk; |
656 | struct socket *sock; | |
657 | int err; | |
7ba24713 | 658 | |
5bb0b55a | 659 | /* lookup for existing socket */ |
264faaaa | 660 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 661 | if (!sock) { |
322d739d MC |
662 | iscsi_conn_printk(KERN_ERR, conn, |
663 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 664 | return -EEXIST; |
7ba24713 | 665 | } |
22236961 MC |
666 | /* |
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 | */ | |
38e1a8f5 MC |
671 | err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address, |
672 | &conn->portal_port, kernel_getpeername); | |
22236961 MC |
673 | if (err) |
674 | goto free_socket; | |
675 | ||
38e1a8f5 MC |
676 | err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address, |
677 | &ihost->local_port, kernel_getsockname); | |
22236961 MC |
678 | if (err) |
679 | goto free_socket; | |
7ba24713 | 680 | |
5bb0b55a MC |
681 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
682 | if (err) | |
22236961 | 683 | goto free_socket; |
7ba24713 | 684 | |
67a61114 | 685 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 686 | tcp_sw_conn->sock = sock; |
7ba24713 | 687 | |
67a61114 MC |
688 | /* 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; | |
7ba24713 | 693 | |
38e1a8f5 MC |
694 | iscsi_sw_tcp_conn_set_callbacks(conn); |
695 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
696 | /* |
697 | * set receive state machine into initial state | |
698 | */ | |
da32dd68 | 699 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 700 | return 0; |
22236961 MC |
701 | |
702 | free_socket: | |
703 | sockfd_put(sock); | |
704 | return err; | |
7ba24713 AA |
705 | } |
706 | ||
38e1a8f5 MC |
707 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
708 | enum iscsi_param param, char *buf, | |
709 | int buflen) | |
7ba24713 | 710 | { |
7b7232f3 | 711 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 712 | struct iscsi_session *session = conn->session; |
5bb0b55a | 713 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 714 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5c75b7fc | 715 | int value; |
7ba24713 | 716 | |
7ba24713 | 717 | switch(param) { |
7ba24713 | 718 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 719 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
720 | break; |
721 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 722 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
723 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
724 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 725 | break; |
7ba24713 | 726 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 727 | sscanf(buf, "%d", &value); |
df93ffcd MC |
728 | if (value <= 0 || !is_power_of_2(value)) |
729 | return -EINVAL; | |
730 | if (session->max_r2t == value) | |
7ba24713 | 731 | break; |
38e1a8f5 | 732 | iscsi_tcp_r2tpool_free(session); |
5c75b7fc | 733 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 | 734 | if (iscsi_tcp_r2tpool_alloc(session)) |
7ba24713 AA |
735 | return -ENOMEM; |
736 | break; | |
7ba24713 | 737 | default: |
5c75b7fc | 738 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
739 | } |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
38e1a8f5 MC |
744 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
745 | enum iscsi_param param, char *buf) | |
7b8631b5 | 746 | { |
7b7232f3 | 747 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 748 | int len; |
7b8631b5 MC |
749 | |
750 | switch(param) { | |
fd7255f5 | 751 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
752 | spin_lock_bh(&conn->session->lock); |
753 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
754 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 755 | break; |
fd7255f5 | 756 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
757 | spin_lock_bh(&conn->session->lock); |
758 | len = sprintf(buf, "%s\n", conn->portal_address); | |
759 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
760 | break; |
761 | default: | |
5c75b7fc | 762 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
763 | } |
764 | ||
765 | return len; | |
766 | } | |
767 | ||
7ba24713 | 768 | static void |
38e1a8f5 MC |
769 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
770 | struct iscsi_stats *stats) | |
7ba24713 | 771 | { |
7b7232f3 | 772 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 773 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 774 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 775 | |
7ba24713 AA |
776 | stats->custom_length = 3; |
777 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 778 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 779 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 780 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
781 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
782 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
783 | |
784 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
785 | } |
786 | ||
5bb0b55a | 787 | static struct iscsi_cls_session * |
38e1a8f5 | 788 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 789 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 790 | { |
5bb0b55a MC |
791 | struct iscsi_cls_session *cls_session; |
792 | struct iscsi_session *session; | |
06520ede | 793 | struct Scsi_Host *shost; |
7ba24713 | 794 | |
06520ede MC |
795 | if (ep) { |
796 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
797 | return NULL; |
798 | } | |
799 | ||
4d108350 | 800 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1); |
75613521 | 801 | if (!shost) |
5bb0b55a | 802 | return NULL; |
38e1a8f5 | 803 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 804 | shost->cmd_per_lun = qdepth; |
75613521 MC |
805 | shost->max_lun = iscsi_max_lun; |
806 | shost->max_id = 0; | |
807 | shost->max_channel = 0; | |
30e9ba9f | 808 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 809 | |
a4804cd6 | 810 | if (iscsi_host_add(shost, NULL)) |
75613521 | 811 | goto free_host; |
75613521 | 812 | |
38e1a8f5 MC |
813 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
814 | cmds_max, | |
815 | sizeof(struct iscsi_tcp_task) + | |
816 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 817 | initial_cmdsn, 0); |
75613521 MC |
818 | if (!cls_session) |
819 | goto remove_host; | |
820 | session = cls_session->dd_data; | |
7ba24713 | 821 | |
fbc514b4 | 822 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 823 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 824 | goto remove_session; |
5bb0b55a MC |
825 | return cls_session; |
826 | ||
75613521 | 827 | remove_session: |
5bb0b55a | 828 | iscsi_session_teardown(cls_session); |
75613521 | 829 | remove_host: |
a4804cd6 | 830 | iscsi_host_remove(shost); |
75613521 | 831 | free_host: |
a4804cd6 | 832 | iscsi_host_free(shost); |
5bb0b55a MC |
833 | return NULL; |
834 | } | |
835 | ||
38e1a8f5 | 836 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 837 | { |
75613521 MC |
838 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
839 | ||
38e1a8f5 | 840 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 841 | iscsi_session_teardown(cls_session); |
75613521 | 842 | |
a4804cd6 MC |
843 | iscsi_host_remove(shost); |
844 | iscsi_host_free(shost); | |
7ba24713 AA |
845 | } |
846 | ||
091e6dbe PW |
847 | static 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 | ||
38e1a8f5 | 853 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 854 | { |
b6d44fe9 | 855 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
856 | blk_queue_dma_alignment(sdev->request_queue, 0); |
857 | return 0; | |
858 | } | |
859 | ||
38e1a8f5 | 860 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 861 | .module = THIS_MODULE, |
f4246b33 | 862 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
863 | .queuecommand = iscsi_queuecommand, |
864 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 865 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 866 | .sg_tablesize = 4096, |
8231f0ed | 867 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
868 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
869 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 870 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 871 | .eh_target_reset_handler= iscsi_eh_target_reset, |
5bb0b55a | 872 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 873 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 874 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 875 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
876 | .proc_name = "iscsi_tcp", |
877 | .this_id = -1, | |
878 | }; | |
879 | ||
38e1a8f5 | 880 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
881 | .owner = THIS_MODULE, |
882 | .name = "tcp", | |
883 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
884 | | CAP_DATADGST, | |
fd7255f5 MC |
885 | .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 | | |
8d2860b3 | 898 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
899 | ISCSI_EXP_STATSN | |
900 | ISCSI_PERSISTENT_PORT | | |
901 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
902 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
903 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 904 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c MC |
905 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
906 | ISCSI_LU_RESET_TMO | | |
88dfd340 MC |
907 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
908 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
22236961 | 909 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
910 | ISCSI_HOST_INITIATOR_NAME | |
911 | ISCSI_HOST_NETDEV_NAME, | |
5bb0b55a | 912 | /* session management */ |
38e1a8f5 MC |
913 | .create_session = iscsi_sw_tcp_session_create, |
914 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 915 | /* connection management */ |
38e1a8f5 MC |
916 | .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, | |
7b8631b5 | 921 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 922 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 923 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 924 | /* iscsi host params */ |
75613521 | 925 | .get_host_param = iscsi_host_get_param, |
0801c242 | 926 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 927 | /* IO */ |
7ba24713 | 928 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 929 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 930 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
931 | .init_task = iscsi_tcp_task_init, |
932 | .xmit_task = iscsi_tcp_task_xmit, | |
933 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 934 | /* low level pdu helpers */ |
38e1a8f5 MC |
935 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
936 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
937 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 938 | /* recovery */ |
30a6c652 | 939 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
940 | }; |
941 | ||
38e1a8f5 | 942 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 943 | { |
7ba24713 | 944 | if (iscsi_max_lun < 1) { |
be2df72e OG |
945 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
946 | iscsi_max_lun); | |
7ba24713 AA |
947 | return -EINVAL; |
948 | } | |
7ba24713 | 949 | |
38e1a8f5 MC |
950 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
951 | &iscsi_sw_tcp_transport); | |
952 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 953 | return -ENODEV; |
7ba24713 | 954 | |
7b8631b5 | 955 | return 0; |
7ba24713 AA |
956 | } |
957 | ||
38e1a8f5 | 958 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 959 | { |
38e1a8f5 | 960 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
961 | } |
962 | ||
38e1a8f5 MC |
963 | module_init(iscsi_sw_tcp_init); |
964 | module_exit(iscsi_sw_tcp_exit); |