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> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
4e7aba73 | 32 | #include <linux/file.h> |
7ba24713 AA |
33 | #include <linux/blkdev.h> |
34 | #include <linux/crypto.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/kfifo.h> | |
37 | #include <linux/scatterlist.h> | |
38 | #include <net/tcp.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 40 | #include <scsi/scsi_device.h> |
7ba24713 AA |
41 | #include <scsi/scsi_host.h> |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_transport_iscsi.h> | |
44 | ||
45 | #include "iscsi_tcp.h" | |
46 | ||
38e1a8f5 MC |
47 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
48 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
49 | "Alex Aizman <itn780@yahoo.com>"); |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
7ba24713 | 52 | |
38e1a8f5 MC |
53 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
54 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
55 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 56 | |
7ba24713 AA |
57 | static unsigned int iscsi_max_lun = 512; |
58 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
59 | ||
c93f87c7 MC |
60 | static int iscsi_sw_tcp_dbg; |
61 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
62 | S_IRUGO | S_IWUSR); | |
63 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
64 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
65 | ||
66 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
67 | do { \ | |
68 | if (iscsi_sw_tcp_dbg) \ | |
69 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
70 | "%s " dbg_fmt, \ | |
71 | __func__, ##arg); \ | |
72 | } while (0); | |
73 | ||
74 | ||
da32dd68 | 75 | /** |
38e1a8f5 | 76 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
77 | * @rd_desc: read descriptor |
78 | * @skb: socket buffer | |
79 | * @offset: offset in skb | |
80 | * @len: skb->len - offset | |
38e1a8f5 MC |
81 | */ |
82 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
83 | unsigned int offset, size_t len) | |
63c62f1c MC |
84 | { |
85 | struct iscsi_conn *conn = rd_desc->arg.data; | |
86 | unsigned int consumed, total_consumed = 0; | |
87 | int status; | |
88 | ||
c93f87c7 | 89 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
90 | |
91 | do { | |
92 | status = 0; | |
93 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
94 | offset += consumed; | |
95 | total_consumed += consumed; | |
96 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
97 | ||
c93f87c7 MC |
98 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
99 | skb->len - offset, status); | |
63c62f1c | 100 | return total_consumed; |
7ba24713 AA |
101 | } |
102 | ||
523eeac6 HR |
103 | /** |
104 | * iscsi_sw_sk_state_check - check socket state | |
105 | * @sk: socket | |
106 | * | |
107 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
108 | * not close the connection if there is still some | |
109 | * data pending. | |
110 | */ | |
111 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
112 | { | |
d1af8a32 | 113 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; |
523eeac6 | 114 | |
d1af8a32 MC |
115 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
116 | !atomic_read(&sk->sk_rmem_alloc)) { | |
117 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
118 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
119 | return -ECONNRESET; | |
120 | } | |
523eeac6 HR |
121 | return 0; |
122 | } | |
123 | ||
38e1a8f5 | 124 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 AA |
125 | { |
126 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 127 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
128 | read_descriptor_t rd_desc; |
129 | ||
130 | read_lock(&sk->sk_callback_lock); | |
131 | ||
665b44ae | 132 | /* |
da32dd68 | 133 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 134 | * We set count to 1 because we want the network layer to |
da32dd68 | 135 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
136 | * handled pdus that cross buffers or pdus that still need data. |
137 | */ | |
7ba24713 | 138 | rd_desc.arg.data = conn; |
665b44ae | 139 | rd_desc.count = 1; |
38e1a8f5 | 140 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 141 | |
d1af8a32 | 142 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 143 | |
7ba24713 | 144 | read_unlock(&sk->sk_callback_lock); |
da32dd68 OK |
145 | |
146 | /* If we had to (atomically) map a highmem page, | |
147 | * unmap it now. */ | |
a8ac6311 | 148 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7ba24713 AA |
149 | } |
150 | ||
38e1a8f5 | 151 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 152 | { |
5bb0b55a | 153 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 154 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 AA |
155 | struct iscsi_conn *conn; |
156 | struct iscsi_session *session; | |
157 | void (*old_state_change)(struct sock *); | |
158 | ||
159 | read_lock(&sk->sk_callback_lock); | |
160 | ||
161 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
162 | session = conn->session; | |
163 | ||
d1af8a32 | 164 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 165 | |
5bb0b55a | 166 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
167 | tcp_sw_conn = tcp_conn->dd_data; |
168 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
169 | |
170 | read_unlock(&sk->sk_callback_lock); | |
171 | ||
172 | old_state_change(sk); | |
173 | } | |
174 | ||
175 | /** | |
176 | * iscsi_write_space - Called when more output buffer space is available | |
177 | * @sk: socket space is available for | |
178 | **/ | |
38e1a8f5 | 179 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 AA |
180 | { |
181 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a | 182 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 183 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a | 184 | |
38e1a8f5 | 185 | tcp_sw_conn->old_write_space(sk); |
c93f87c7 | 186 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 187 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
188 | } |
189 | ||
38e1a8f5 | 190 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 191 | { |
5bb0b55a | 192 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
193 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
194 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
195 | |
196 | /* assign new callbacks */ | |
197 | write_lock_bh(&sk->sk_callback_lock); | |
198 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
199 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
200 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
201 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
202 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
203 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
204 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
205 | write_unlock_bh(&sk->sk_callback_lock); |
206 | } | |
207 | ||
38e1a8f5 MC |
208 | static void |
209 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn) | |
7ba24713 | 210 | { |
38e1a8f5 | 211 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
212 | |
213 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
214 | write_lock_bh(&sk->sk_callback_lock); | |
215 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
216 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
217 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
218 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
7ba24713 AA |
219 | sk->sk_no_check = 0; |
220 | write_unlock_bh(&sk->sk_callback_lock); | |
221 | } | |
222 | ||
223 | /** | |
38e1a8f5 | 224 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 225 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
226 | * @segment: the buffer to transmnit |
227 | * | |
228 | * This function transmits as much of the buffer as | |
229 | * the network layer will accept, and returns the number of | |
230 | * bytes transmitted. | |
231 | * | |
232 | * If CRC hashing is enabled, the function will compute the | |
233 | * hash as it goes. When the entire segment has been transmitted, | |
234 | * it will retrieve the hash value and send it as well. | |
235 | */ | |
6df19a79 | 236 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
237 | struct iscsi_segment *segment) |
238 | { | |
6df19a79 | 239 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
240 | struct socket *sk = tcp_sw_conn->sock; |
241 | unsigned int copied = 0; | |
242 | int r = 0; | |
243 | ||
6df19a79 | 244 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
245 | struct scatterlist *sg; |
246 | unsigned int offset, copy; | |
247 | int flags = 0; | |
248 | ||
249 | r = 0; | |
250 | offset = segment->copied; | |
251 | copy = segment->size - offset; | |
252 | ||
253 | if (segment->total_copied + segment->size < segment->total_size) | |
254 | flags |= MSG_MORE; | |
255 | ||
256 | /* Use sendpage if we can; else fall back to sendmsg */ | |
257 | if (!segment->data) { | |
258 | sg = segment->sg; | |
259 | offset += segment->sg_offset + sg->offset; | |
260 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
261 | copy, flags); | |
262 | } else { | |
263 | struct msghdr msg = { .msg_flags = flags }; | |
264 | struct kvec iov = { | |
265 | .iov_base = segment->data + offset, | |
266 | .iov_len = copy | |
267 | }; | |
268 | ||
269 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
270 | } | |
271 | ||
272 | if (r < 0) { | |
273 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
274 | return r; |
275 | } | |
276 | copied += r; | |
277 | } | |
278 | return copied; | |
279 | } | |
280 | ||
281 | /** | |
282 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 283 | **/ |
38e1a8f5 | 284 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 285 | { |
5bb0b55a | 286 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
287 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
288 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
289 | unsigned int consumed = 0; |
290 | int rc = 0; | |
7ba24713 | 291 | |
a8ac6311 | 292 | while (1) { |
6df19a79 | 293 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
294 | /* |
295 | * We may not have been able to send data because the conn | |
296 | * is getting stopped. libiscsi will know so propogate err | |
297 | * for it to do the right thing. | |
298 | */ | |
299 | if (rc == -EAGAIN) | |
300 | return rc; | |
301 | else if (rc < 0) { | |
6f481e3c | 302 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 303 | goto error; |
32382492 | 304 | } else if (rc == 0) |
a8ac6311 OK |
305 | break; |
306 | ||
307 | consumed += rc; | |
308 | ||
309 | if (segment->total_copied >= segment->total_size) { | |
310 | if (segment->done != NULL) { | |
311 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 312 | if (rc != 0) |
a8ac6311 OK |
313 | goto error; |
314 | } | |
315 | } | |
3219e529 MC |
316 | } |
317 | ||
c93f87c7 | 318 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
319 | |
320 | conn->txdata_octets += consumed; | |
321 | return consumed; | |
322 | ||
323 | error: | |
324 | /* Transmit error. We could initiate error recovery | |
325 | * here. */ | |
c93f87c7 | 326 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
327 | iscsi_conn_failure(conn, rc); |
328 | return -EIO; | |
7ba24713 AA |
329 | } |
330 | ||
331 | /** | |
a8ac6311 OK |
332 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
333 | */ | |
38e1a8f5 | 334 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 335 | { |
a8ac6311 | 336 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
337 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
338 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 339 | |
a8ac6311 | 340 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
341 | } |
342 | ||
38e1a8f5 | 343 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 344 | { |
e5a7efef | 345 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
346 | int rc; |
347 | ||
38e1a8f5 MC |
348 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
349 | rc = iscsi_sw_tcp_xmit(conn); | |
a8ac6311 | 350 | if (rc == 0) |
7ba24713 | 351 | return -EAGAIN; |
a8ac6311 OK |
352 | if (rc < 0) |
353 | return rc; | |
3219e529 | 354 | } |
7ba24713 | 355 | |
a8ac6311 | 356 | return 0; |
7ba24713 AA |
357 | } |
358 | ||
a8ac6311 OK |
359 | /* |
360 | * This is called when we're done sending the header. | |
361 | * Simply copy the data_segment to the send segment, and return. | |
362 | */ | |
38e1a8f5 MC |
363 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
364 | struct iscsi_segment *segment) | |
7ba24713 | 365 | { |
38e1a8f5 MC |
366 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
367 | ||
368 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
369 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
370 | "Header done. Next segment size %u total_size %u\n", | |
371 | tcp_sw_conn->out.segment.size, | |
372 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
373 | return 0; |
374 | } | |
375 | ||
38e1a8f5 MC |
376 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
377 | size_t hdrlen) | |
a8ac6311 OK |
378 | { |
379 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 380 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 381 | |
c93f87c7 MC |
382 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
383 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
384 | |
385 | /* Clear the data segment - needs to be filled in by the | |
386 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
387 | memset(&tcp_sw_conn->out.data_segment, 0, |
388 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
389 | |
390 | /* If header digest is enabled, compute the CRC and | |
391 | * place the digest into the same buffer. We make | |
135a8ad4 | 392 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
393 | * sufficient room. |
394 | */ | |
395 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 396 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
397 | hdr + hdrlen); |
398 | hdrlen += ISCSI_DIGEST_SIZE; | |
399 | } | |
400 | ||
401 | /* Remember header pointer for later, when we need | |
402 | * to decide whether there's a payload to go along | |
403 | * with the header. */ | |
38e1a8f5 | 404 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 405 | |
38e1a8f5 MC |
406 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
407 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
408 | } |
409 | ||
410 | /* | |
411 | * Prepare the send buffer for the payload data. | |
412 | * Padding and checksumming will all be taken care | |
413 | * of by the iscsi_segment routines. | |
414 | */ | |
415 | static int | |
38e1a8f5 MC |
416 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
417 | unsigned int count, unsigned int offset, | |
418 | unsigned int len) | |
a8ac6311 OK |
419 | { |
420 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 421 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
422 | struct hash_desc *tx_hash = NULL; |
423 | unsigned int hdr_spec_len; | |
424 | ||
c93f87c7 MC |
425 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
426 | conn->datadgst_en ? | |
427 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
428 | |
429 | /* Make sure the datalen matches what the caller | |
430 | said he would send. */ | |
38e1a8f5 | 431 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
432 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
433 | ||
434 | if (conn->datadgst_en) | |
38e1a8f5 | 435 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 436 | |
38e1a8f5 MC |
437 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
438 | sg, count, offset, len, | |
439 | NULL, tx_hash); | |
a8ac6311 OK |
440 | } |
441 | ||
442 | static void | |
38e1a8f5 | 443 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
444 | size_t len) |
445 | { | |
446 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 447 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
448 | struct hash_desc *tx_hash = NULL; |
449 | unsigned int hdr_spec_len; | |
450 | ||
c93f87c7 MC |
451 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
452 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
453 | |
454 | /* Make sure the datalen matches what the caller | |
455 | said he would send. */ | |
38e1a8f5 | 456 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
457 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
458 | ||
459 | if (conn->datadgst_en) | |
38e1a8f5 | 460 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 461 | |
38e1a8f5 | 462 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 463 | data, len, NULL, tx_hash); |
7ba24713 AA |
464 | } |
465 | ||
38e1a8f5 MC |
466 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
467 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
468 | { |
469 | struct iscsi_conn *conn = task->conn; | |
470 | int err = 0; | |
471 | ||
38e1a8f5 | 472 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
473 | |
474 | if (!count) | |
475 | return 0; | |
476 | ||
477 | if (!task->sc) | |
38e1a8f5 | 478 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
479 | else { |
480 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
481 | ||
38e1a8f5 MC |
482 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
483 | sdb->table.nents, offset, | |
484 | count); | |
e5a7efef MC |
485 | } |
486 | ||
487 | if (err) { | |
9a6510eb | 488 | /* got invalid offset/len */ |
e5a7efef MC |
489 | return -EIO; |
490 | } | |
491 | return 0; | |
492 | } | |
493 | ||
2ff79d52 | 494 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 495 | { |
135a8ad4 | 496 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 497 | |
38e1a8f5 MC |
498 | task->hdr = task->dd_data + sizeof(*tcp_task); |
499 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 500 | return 0; |
7ba24713 AA |
501 | } |
502 | ||
5bb0b55a | 503 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
504 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
505 | uint32_t conn_idx) | |
7ba24713 | 506 | { |
5bb0b55a MC |
507 | struct iscsi_conn *conn; |
508 | struct iscsi_cls_conn *cls_conn; | |
509 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 510 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 511 | |
38e1a8f5 MC |
512 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
513 | conn_idx); | |
5bb0b55a MC |
514 | if (!cls_conn) |
515 | return NULL; | |
516 | conn = cls_conn->dd_data; | |
5d91e209 | 517 | tcp_conn = conn->dd_data; |
38e1a8f5 | 518 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 519 | |
38e1a8f5 MC |
520 | tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
521 | CRYPTO_ALG_ASYNC); | |
522 | tcp_sw_conn->tx_hash.flags = 0; | |
523 | if (IS_ERR(tcp_sw_conn->tx_hash.tfm)) | |
5d91e209 | 524 | goto free_conn; |
dd8c0d95 | 525 | |
38e1a8f5 MC |
526 | tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
527 | CRYPTO_ALG_ASYNC); | |
528 | tcp_sw_conn->rx_hash.flags = 0; | |
529 | if (IS_ERR(tcp_sw_conn->rx_hash.tfm)) | |
dd8c0d95 | 530 | goto free_tx_tfm; |
38e1a8f5 | 531 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 532 | |
5bb0b55a | 533 | return cls_conn; |
7ba24713 | 534 | |
dd8c0d95 | 535 | free_tx_tfm: |
38e1a8f5 | 536 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 537 | free_conn: |
322d739d MC |
538 | iscsi_conn_printk(KERN_ERR, conn, |
539 | "Could not create connection due to crc32c " | |
540 | "loading error. Make sure the crc32c " | |
541 | "module is built as a module or into the " | |
542 | "kernel\n"); | |
38e1a8f5 | 543 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 544 | return NULL; |
7ba24713 AA |
545 | } |
546 | ||
38e1a8f5 | 547 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 548 | { |
22236961 | 549 | struct iscsi_session *session = conn->session; |
1c83469d | 550 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
551 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
552 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 553 | |
22236961 | 554 | if (!sock) |
1c83469d MC |
555 | return; |
556 | ||
22236961 | 557 | sock_hold(sock->sk); |
38e1a8f5 | 558 | iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn); |
22236961 | 559 | sock_put(sock->sk); |
1c83469d | 560 | |
22236961 | 561 | spin_lock_bh(&session->lock); |
38e1a8f5 | 562 | tcp_sw_conn->sock = NULL; |
22236961 MC |
563 | spin_unlock_bh(&session->lock); |
564 | sockfd_put(sock); | |
1c83469d MC |
565 | } |
566 | ||
38e1a8f5 | 567 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 568 | { |
5bb0b55a MC |
569 | struct iscsi_conn *conn = cls_conn->dd_data; |
570 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 571 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 572 | |
38e1a8f5 | 573 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 574 | |
38e1a8f5 MC |
575 | if (tcp_sw_conn->tx_hash.tfm) |
576 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); | |
577 | if (tcp_sw_conn->rx_hash.tfm) | |
578 | crypto_free_hash(tcp_sw_conn->rx_hash.tfm); | |
7ba24713 | 579 | |
38e1a8f5 | 580 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 581 | } |
7ba24713 | 582 | |
38e1a8f5 | 583 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
584 | { |
585 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 586 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 587 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 588 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
589 | |
590 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 591 | if (!sock) |
913e5bf4 MC |
592 | return; |
593 | /* | |
594 | * Make sure our recv side is stopped. | |
595 | * Older tools called conn stop before ep_disconnect | |
596 | * so IO could still be coming in. | |
597 | */ | |
38e1a8f5 | 598 | write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
913e5bf4 | 599 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
38e1a8f5 | 600 | write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
1c83469d | 601 | |
b64e77f7 MC |
602 | if (sock->sk->sk_sleep && waitqueue_active(sock->sk->sk_sleep)) { |
603 | sock->sk->sk_err = EIO; | |
604 | wake_up_interruptible(sock->sk->sk_sleep); | |
605 | } | |
606 | ||
1c83469d | 607 | iscsi_conn_stop(cls_conn, flag); |
38e1a8f5 | 608 | iscsi_sw_tcp_release_conn(conn); |
1c83469d MC |
609 | } |
610 | ||
38e1a8f5 MC |
611 | static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
612 | char *buf, int *port, | |
613 | int (*getname)(struct socket *, | |
614 | struct sockaddr *, | |
615 | int *addrlen)) | |
22236961 MC |
616 | { |
617 | struct sockaddr_storage *addr; | |
618 | struct sockaddr_in6 *sin6; | |
619 | struct sockaddr_in *sin; | |
620 | int rc = 0, len; | |
621 | ||
a9204879 | 622 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
623 | if (!addr) |
624 | return -ENOMEM; | |
625 | ||
626 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
627 | rc = -ENODEV; | |
628 | goto free_addr; | |
629 | } | |
630 | ||
631 | switch (addr->ss_family) { | |
632 | case AF_INET: | |
633 | sin = (struct sockaddr_in *)addr; | |
634 | spin_lock_bh(&conn->session->lock); | |
63779436 | 635 | sprintf(buf, "%pI4", &sin->sin_addr.s_addr); |
22236961 MC |
636 | *port = be16_to_cpu(sin->sin_port); |
637 | spin_unlock_bh(&conn->session->lock); | |
638 | break; | |
639 | case AF_INET6: | |
640 | sin6 = (struct sockaddr_in6 *)addr; | |
641 | spin_lock_bh(&conn->session->lock); | |
5b095d98 | 642 | sprintf(buf, "%pI6", &sin6->sin6_addr); |
22236961 MC |
643 | *port = be16_to_cpu(sin6->sin6_port); |
644 | spin_unlock_bh(&conn->session->lock); | |
645 | break; | |
646 | } | |
647 | free_addr: | |
648 | kfree(addr); | |
649 | return rc; | |
650 | } | |
651 | ||
5bb0b55a | 652 | static int |
38e1a8f5 MC |
653 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
654 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
655 | int is_leading) | |
5bb0b55a | 656 | { |
75613521 MC |
657 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
658 | struct iscsi_host *ihost = shost_priv(shost); | |
5bb0b55a MC |
659 | struct iscsi_conn *conn = cls_conn->dd_data; |
660 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 661 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
662 | struct sock *sk; |
663 | struct socket *sock; | |
664 | int err; | |
7ba24713 | 665 | |
5bb0b55a | 666 | /* lookup for existing socket */ |
264faaaa | 667 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 668 | if (!sock) { |
322d739d MC |
669 | iscsi_conn_printk(KERN_ERR, conn, |
670 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 671 | return -EEXIST; |
7ba24713 | 672 | } |
22236961 MC |
673 | /* |
674 | * copy these values now because if we drop the session | |
675 | * userspace may still want to query the values since we will | |
676 | * be using them for the reconnect | |
677 | */ | |
38e1a8f5 MC |
678 | err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address, |
679 | &conn->portal_port, kernel_getpeername); | |
22236961 MC |
680 | if (err) |
681 | goto free_socket; | |
682 | ||
38e1a8f5 MC |
683 | err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address, |
684 | &ihost->local_port, kernel_getsockname); | |
22236961 MC |
685 | if (err) |
686 | goto free_socket; | |
7ba24713 | 687 | |
5bb0b55a MC |
688 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
689 | if (err) | |
22236961 | 690 | goto free_socket; |
7ba24713 | 691 | |
67a61114 | 692 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 693 | tcp_sw_conn->sock = sock; |
7ba24713 | 694 | |
67a61114 MC |
695 | /* setup Socket parameters */ |
696 | sk = sock->sk; | |
697 | sk->sk_reuse = 1; | |
698 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
699 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 700 | |
38e1a8f5 MC |
701 | iscsi_sw_tcp_conn_set_callbacks(conn); |
702 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
703 | /* |
704 | * set receive state machine into initial state | |
705 | */ | |
da32dd68 | 706 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 707 | return 0; |
22236961 MC |
708 | |
709 | free_socket: | |
710 | sockfd_put(sock); | |
711 | return err; | |
7ba24713 AA |
712 | } |
713 | ||
38e1a8f5 MC |
714 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
715 | enum iscsi_param param, char *buf, | |
716 | int buflen) | |
7ba24713 | 717 | { |
7b7232f3 | 718 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 719 | struct iscsi_session *session = conn->session; |
5bb0b55a | 720 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 721 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5c75b7fc | 722 | int value; |
7ba24713 | 723 | |
7ba24713 | 724 | switch(param) { |
7ba24713 | 725 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 726 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
727 | break; |
728 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 729 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
730 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
731 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 732 | break; |
7ba24713 | 733 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 734 | sscanf(buf, "%d", &value); |
df93ffcd MC |
735 | if (value <= 0 || !is_power_of_2(value)) |
736 | return -EINVAL; | |
737 | if (session->max_r2t == value) | |
7ba24713 | 738 | break; |
38e1a8f5 | 739 | iscsi_tcp_r2tpool_free(session); |
5c75b7fc | 740 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 | 741 | if (iscsi_tcp_r2tpool_alloc(session)) |
7ba24713 AA |
742 | return -ENOMEM; |
743 | break; | |
7ba24713 | 744 | default: |
5c75b7fc | 745 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
746 | } |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
38e1a8f5 MC |
751 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
752 | enum iscsi_param param, char *buf) | |
7b8631b5 | 753 | { |
7b7232f3 | 754 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 755 | int len; |
7b8631b5 MC |
756 | |
757 | switch(param) { | |
fd7255f5 | 758 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
759 | spin_lock_bh(&conn->session->lock); |
760 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
761 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 762 | break; |
fd7255f5 | 763 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
764 | spin_lock_bh(&conn->session->lock); |
765 | len = sprintf(buf, "%s\n", conn->portal_address); | |
766 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
767 | break; |
768 | default: | |
5c75b7fc | 769 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
770 | } |
771 | ||
772 | return len; | |
773 | } | |
774 | ||
7ba24713 | 775 | static void |
38e1a8f5 MC |
776 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
777 | struct iscsi_stats *stats) | |
7ba24713 | 778 | { |
7b7232f3 | 779 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 780 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 781 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 782 | |
7ba24713 AA |
783 | stats->custom_length = 3; |
784 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 785 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 786 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 787 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
788 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
789 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
790 | |
791 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
792 | } |
793 | ||
5bb0b55a | 794 | static struct iscsi_cls_session * |
38e1a8f5 | 795 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 796 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 797 | { |
5bb0b55a MC |
798 | struct iscsi_cls_session *cls_session; |
799 | struct iscsi_session *session; | |
06520ede | 800 | struct Scsi_Host *shost; |
7ba24713 | 801 | |
06520ede MC |
802 | if (ep) { |
803 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
804 | return NULL; |
805 | } | |
806 | ||
4d108350 | 807 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1); |
75613521 | 808 | if (!shost) |
5bb0b55a | 809 | return NULL; |
38e1a8f5 | 810 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 811 | shost->cmd_per_lun = qdepth; |
75613521 MC |
812 | shost->max_lun = iscsi_max_lun; |
813 | shost->max_id = 0; | |
814 | shost->max_channel = 0; | |
30e9ba9f | 815 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 816 | |
a4804cd6 | 817 | if (iscsi_host_add(shost, NULL)) |
75613521 | 818 | goto free_host; |
75613521 | 819 | |
38e1a8f5 | 820 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 821 | cmds_max, 0, |
38e1a8f5 MC |
822 | sizeof(struct iscsi_tcp_task) + |
823 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 824 | initial_cmdsn, 0); |
75613521 MC |
825 | if (!cls_session) |
826 | goto remove_host; | |
827 | session = cls_session->dd_data; | |
7ba24713 | 828 | |
fbc514b4 | 829 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 830 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 831 | goto remove_session; |
5bb0b55a MC |
832 | return cls_session; |
833 | ||
75613521 | 834 | remove_session: |
5bb0b55a | 835 | iscsi_session_teardown(cls_session); |
75613521 | 836 | remove_host: |
a4804cd6 | 837 | iscsi_host_remove(shost); |
75613521 | 838 | free_host: |
a4804cd6 | 839 | iscsi_host_free(shost); |
5bb0b55a MC |
840 | return NULL; |
841 | } | |
842 | ||
38e1a8f5 | 843 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 844 | { |
75613521 MC |
845 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
846 | ||
38e1a8f5 | 847 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 848 | iscsi_session_teardown(cls_session); |
75613521 | 849 | |
a4804cd6 MC |
850 | iscsi_host_remove(shost); |
851 | iscsi_host_free(shost); | |
7ba24713 AA |
852 | } |
853 | ||
091e6dbe PW |
854 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
855 | { | |
856 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
857 | return 0; | |
858 | } | |
859 | ||
38e1a8f5 | 860 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 861 | { |
b6d44fe9 | 862 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
863 | blk_queue_dma_alignment(sdev->request_queue, 0); |
864 | return 0; | |
865 | } | |
866 | ||
38e1a8f5 | 867 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 868 | .module = THIS_MODULE, |
f4246b33 | 869 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
870 | .queuecommand = iscsi_queuecommand, |
871 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 872 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 873 | .sg_tablesize = 4096, |
8231f0ed | 874 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
875 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
876 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 877 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 878 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 879 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 880 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 881 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 882 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
883 | .proc_name = "iscsi_tcp", |
884 | .this_id = -1, | |
885 | }; | |
886 | ||
38e1a8f5 | 887 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
888 | .owner = THIS_MODULE, |
889 | .name = "tcp", | |
890 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
891 | | CAP_DATADGST, | |
fd7255f5 MC |
892 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
893 | ISCSI_MAX_XMIT_DLENGTH | | |
894 | ISCSI_HDRDGST_EN | | |
895 | ISCSI_DATADGST_EN | | |
896 | ISCSI_INITIAL_R2T_EN | | |
897 | ISCSI_MAX_R2T | | |
898 | ISCSI_IMM_DATA_EN | | |
899 | ISCSI_FIRST_BURST | | |
900 | ISCSI_MAX_BURST | | |
901 | ISCSI_PDU_INORDER_EN | | |
902 | ISCSI_DATASEQ_INORDER_EN | | |
903 | ISCSI_ERL | | |
904 | ISCSI_CONN_PORT | | |
8d2860b3 | 905 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
906 | ISCSI_EXP_STATSN | |
907 | ISCSI_PERSISTENT_PORT | | |
908 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
909 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
910 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 911 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c | 912 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
3fe5ae8b | 913 | ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO | |
88dfd340 MC |
914 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
915 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
22236961 | 916 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
917 | ISCSI_HOST_INITIATOR_NAME | |
918 | ISCSI_HOST_NETDEV_NAME, | |
5bb0b55a | 919 | /* session management */ |
38e1a8f5 MC |
920 | .create_session = iscsi_sw_tcp_session_create, |
921 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 922 | /* connection management */ |
38e1a8f5 MC |
923 | .create_conn = iscsi_sw_tcp_conn_create, |
924 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
925 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
926 | .set_param = iscsi_sw_tcp_conn_set_param, | |
927 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 928 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 929 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 930 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 931 | /* iscsi host params */ |
75613521 | 932 | .get_host_param = iscsi_host_get_param, |
0801c242 | 933 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 934 | /* IO */ |
7ba24713 | 935 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 936 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 937 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
938 | .init_task = iscsi_tcp_task_init, |
939 | .xmit_task = iscsi_tcp_task_xmit, | |
940 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 941 | /* low level pdu helpers */ |
38e1a8f5 MC |
942 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
943 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
944 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 945 | /* recovery */ |
30a6c652 | 946 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
947 | }; |
948 | ||
38e1a8f5 | 949 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 950 | { |
7ba24713 | 951 | if (iscsi_max_lun < 1) { |
be2df72e OG |
952 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
953 | iscsi_max_lun); | |
7ba24713 AA |
954 | return -EINVAL; |
955 | } | |
7ba24713 | 956 | |
38e1a8f5 MC |
957 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
958 | &iscsi_sw_tcp_transport); | |
959 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 960 | return -ENODEV; |
7ba24713 | 961 | |
7b8631b5 | 962 | return 0; |
7ba24713 AA |
963 | } |
964 | ||
38e1a8f5 | 965 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 966 | { |
38e1a8f5 | 967 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
968 | } |
969 | ||
38e1a8f5 MC |
970 | module_init(iscsi_sw_tcp_init); |
971 | module_exit(iscsi_sw_tcp_exit); |