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 | { | |
112 | if ((sk->sk_state == TCP_CLOSE_WAIT || | |
113 | sk->sk_state == TCP_CLOSE) && | |
114 | !atomic_read(&sk->sk_rmem_alloc)) | |
115 | return -ECONNRESET; | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
38e1a8f5 | 120 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 AA |
121 | { |
122 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 123 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
124 | read_descriptor_t rd_desc; |
125 | ||
126 | read_lock(&sk->sk_callback_lock); | |
127 | ||
665b44ae | 128 | /* |
da32dd68 | 129 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 130 | * We set count to 1 because we want the network layer to |
da32dd68 | 131 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
132 | * handled pdus that cross buffers or pdus that still need data. |
133 | */ | |
7ba24713 | 134 | rd_desc.arg.data = conn; |
665b44ae | 135 | rd_desc.count = 1; |
38e1a8f5 | 136 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 137 | |
523eeac6 HR |
138 | if (iscsi_sw_sk_state_check(sk) < 0) { |
139 | ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_data_ready: " | |
140 | "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
141 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
142 | } | |
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 | ||
523eeac6 | 164 | if (iscsi_sw_sk_state_check(sk) < 0) { |
c93f87c7 MC |
165 | ISCSI_SW_TCP_DBG(conn, "iscsi_tcp_state_change: " |
166 | "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
7ba24713 AA |
167 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
168 | } | |
169 | ||
5bb0b55a | 170 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
171 | tcp_sw_conn = tcp_conn->dd_data; |
172 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
173 | |
174 | read_unlock(&sk->sk_callback_lock); | |
175 | ||
176 | old_state_change(sk); | |
177 | } | |
178 | ||
179 | /** | |
180 | * iscsi_write_space - Called when more output buffer space is available | |
181 | * @sk: socket space is available for | |
182 | **/ | |
38e1a8f5 | 183 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 AA |
184 | { |
185 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a | 186 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 187 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a | 188 | |
38e1a8f5 | 189 | tcp_sw_conn->old_write_space(sk); |
c93f87c7 | 190 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 191 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
192 | } |
193 | ||
38e1a8f5 | 194 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 195 | { |
5bb0b55a | 196 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
197 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
198 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
199 | |
200 | /* assign new callbacks */ | |
201 | write_lock_bh(&sk->sk_callback_lock); | |
202 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
203 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
204 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
205 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
206 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
207 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
208 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
209 | write_unlock_bh(&sk->sk_callback_lock); |
210 | } | |
211 | ||
38e1a8f5 MC |
212 | static void |
213 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn) | |
7ba24713 | 214 | { |
38e1a8f5 | 215 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
216 | |
217 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
218 | write_lock_bh(&sk->sk_callback_lock); | |
219 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
220 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
221 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
222 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
7ba24713 AA |
223 | sk->sk_no_check = 0; |
224 | write_unlock_bh(&sk->sk_callback_lock); | |
225 | } | |
226 | ||
227 | /** | |
38e1a8f5 | 228 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 229 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
230 | * @segment: the buffer to transmnit |
231 | * | |
232 | * This function transmits as much of the buffer as | |
233 | * the network layer will accept, and returns the number of | |
234 | * bytes transmitted. | |
235 | * | |
236 | * If CRC hashing is enabled, the function will compute the | |
237 | * hash as it goes. When the entire segment has been transmitted, | |
238 | * it will retrieve the hash value and send it as well. | |
239 | */ | |
6df19a79 | 240 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
241 | struct iscsi_segment *segment) |
242 | { | |
6df19a79 | 243 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
244 | struct socket *sk = tcp_sw_conn->sock; |
245 | unsigned int copied = 0; | |
246 | int r = 0; | |
247 | ||
6df19a79 | 248 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
249 | struct scatterlist *sg; |
250 | unsigned int offset, copy; | |
251 | int flags = 0; | |
252 | ||
253 | r = 0; | |
254 | offset = segment->copied; | |
255 | copy = segment->size - offset; | |
256 | ||
257 | if (segment->total_copied + segment->size < segment->total_size) | |
258 | flags |= MSG_MORE; | |
259 | ||
260 | /* Use sendpage if we can; else fall back to sendmsg */ | |
261 | if (!segment->data) { | |
262 | sg = segment->sg; | |
263 | offset += segment->sg_offset + sg->offset; | |
264 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
265 | copy, flags); | |
266 | } else { | |
267 | struct msghdr msg = { .msg_flags = flags }; | |
268 | struct kvec iov = { | |
269 | .iov_base = segment->data + offset, | |
270 | .iov_len = copy | |
271 | }; | |
272 | ||
273 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
274 | } | |
275 | ||
276 | if (r < 0) { | |
277 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
278 | return r; |
279 | } | |
280 | copied += r; | |
281 | } | |
282 | return copied; | |
283 | } | |
284 | ||
285 | /** | |
286 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 287 | **/ |
38e1a8f5 | 288 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 289 | { |
5bb0b55a | 290 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
291 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
292 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
293 | unsigned int consumed = 0; |
294 | int rc = 0; | |
7ba24713 | 295 | |
a8ac6311 | 296 | while (1) { |
6df19a79 | 297 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
298 | /* |
299 | * We may not have been able to send data because the conn | |
300 | * is getting stopped. libiscsi will know so propogate err | |
301 | * for it to do the right thing. | |
302 | */ | |
303 | if (rc == -EAGAIN) | |
304 | return rc; | |
305 | else if (rc < 0) { | |
6f481e3c | 306 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 307 | goto error; |
32382492 | 308 | } else if (rc == 0) |
a8ac6311 OK |
309 | break; |
310 | ||
311 | consumed += rc; | |
312 | ||
313 | if (segment->total_copied >= segment->total_size) { | |
314 | if (segment->done != NULL) { | |
315 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 316 | if (rc != 0) |
a8ac6311 OK |
317 | goto error; |
318 | } | |
319 | } | |
3219e529 MC |
320 | } |
321 | ||
c93f87c7 | 322 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
323 | |
324 | conn->txdata_octets += consumed; | |
325 | return consumed; | |
326 | ||
327 | error: | |
328 | /* Transmit error. We could initiate error recovery | |
329 | * here. */ | |
c93f87c7 | 330 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
331 | iscsi_conn_failure(conn, rc); |
332 | return -EIO; | |
7ba24713 AA |
333 | } |
334 | ||
335 | /** | |
a8ac6311 OK |
336 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
337 | */ | |
38e1a8f5 | 338 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 339 | { |
a8ac6311 | 340 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
341 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
342 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 343 | |
a8ac6311 | 344 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
345 | } |
346 | ||
38e1a8f5 | 347 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 348 | { |
e5a7efef | 349 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
350 | int rc; |
351 | ||
38e1a8f5 MC |
352 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
353 | rc = iscsi_sw_tcp_xmit(conn); | |
a8ac6311 | 354 | if (rc == 0) |
7ba24713 | 355 | return -EAGAIN; |
a8ac6311 OK |
356 | if (rc < 0) |
357 | return rc; | |
3219e529 | 358 | } |
7ba24713 | 359 | |
a8ac6311 | 360 | return 0; |
7ba24713 AA |
361 | } |
362 | ||
a8ac6311 OK |
363 | /* |
364 | * This is called when we're done sending the header. | |
365 | * Simply copy the data_segment to the send segment, and return. | |
366 | */ | |
38e1a8f5 MC |
367 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
368 | struct iscsi_segment *segment) | |
7ba24713 | 369 | { |
38e1a8f5 MC |
370 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
371 | ||
372 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
373 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
374 | "Header done. Next segment size %u total_size %u\n", | |
375 | tcp_sw_conn->out.segment.size, | |
376 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
377 | return 0; |
378 | } | |
379 | ||
38e1a8f5 MC |
380 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
381 | size_t hdrlen) | |
a8ac6311 OK |
382 | { |
383 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 384 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 385 | |
c93f87c7 MC |
386 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
387 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
388 | |
389 | /* Clear the data segment - needs to be filled in by the | |
390 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
391 | memset(&tcp_sw_conn->out.data_segment, 0, |
392 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
393 | |
394 | /* If header digest is enabled, compute the CRC and | |
395 | * place the digest into the same buffer. We make | |
135a8ad4 | 396 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
397 | * sufficient room. |
398 | */ | |
399 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 400 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
401 | hdr + hdrlen); |
402 | hdrlen += ISCSI_DIGEST_SIZE; | |
403 | } | |
404 | ||
405 | /* Remember header pointer for later, when we need | |
406 | * to decide whether there's a payload to go along | |
407 | * with the header. */ | |
38e1a8f5 | 408 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 409 | |
38e1a8f5 MC |
410 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
411 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
412 | } |
413 | ||
414 | /* | |
415 | * Prepare the send buffer for the payload data. | |
416 | * Padding and checksumming will all be taken care | |
417 | * of by the iscsi_segment routines. | |
418 | */ | |
419 | static int | |
38e1a8f5 MC |
420 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
421 | unsigned int count, unsigned int offset, | |
422 | unsigned int len) | |
a8ac6311 OK |
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, "offset=%d, datalen=%d %s\n", offset, len, |
430 | conn->datadgst_en ? | |
431 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
432 | |
433 | /* Make sure the datalen matches what the caller | |
434 | said he would send. */ | |
38e1a8f5 | 435 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
436 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
437 | ||
438 | if (conn->datadgst_en) | |
38e1a8f5 | 439 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 440 | |
38e1a8f5 MC |
441 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
442 | sg, count, offset, len, | |
443 | NULL, tx_hash); | |
a8ac6311 OK |
444 | } |
445 | ||
446 | static void | |
38e1a8f5 | 447 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
448 | size_t len) |
449 | { | |
450 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 451 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
452 | struct hash_desc *tx_hash = NULL; |
453 | unsigned int hdr_spec_len; | |
454 | ||
c93f87c7 MC |
455 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
456 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
457 | |
458 | /* Make sure the datalen matches what the caller | |
459 | said he would send. */ | |
38e1a8f5 | 460 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
461 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
462 | ||
463 | if (conn->datadgst_en) | |
38e1a8f5 | 464 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 465 | |
38e1a8f5 | 466 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 467 | data, len, NULL, tx_hash); |
7ba24713 AA |
468 | } |
469 | ||
38e1a8f5 MC |
470 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
471 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
472 | { |
473 | struct iscsi_conn *conn = task->conn; | |
474 | int err = 0; | |
475 | ||
38e1a8f5 | 476 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
477 | |
478 | if (!count) | |
479 | return 0; | |
480 | ||
481 | if (!task->sc) | |
38e1a8f5 | 482 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
483 | else { |
484 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
485 | ||
38e1a8f5 MC |
486 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
487 | sdb->table.nents, offset, | |
488 | count); | |
e5a7efef MC |
489 | } |
490 | ||
491 | if (err) { | |
9a6510eb | 492 | /* got invalid offset/len */ |
e5a7efef MC |
493 | return -EIO; |
494 | } | |
495 | return 0; | |
496 | } | |
497 | ||
2ff79d52 | 498 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 499 | { |
135a8ad4 | 500 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 501 | |
38e1a8f5 MC |
502 | task->hdr = task->dd_data + sizeof(*tcp_task); |
503 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 504 | return 0; |
7ba24713 AA |
505 | } |
506 | ||
5bb0b55a | 507 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
508 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
509 | uint32_t conn_idx) | |
7ba24713 | 510 | { |
5bb0b55a MC |
511 | struct iscsi_conn *conn; |
512 | struct iscsi_cls_conn *cls_conn; | |
513 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 514 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 515 | |
38e1a8f5 MC |
516 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
517 | conn_idx); | |
5bb0b55a MC |
518 | if (!cls_conn) |
519 | return NULL; | |
520 | conn = cls_conn->dd_data; | |
5d91e209 | 521 | tcp_conn = conn->dd_data; |
38e1a8f5 | 522 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 523 | |
38e1a8f5 MC |
524 | tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
525 | CRYPTO_ALG_ASYNC); | |
526 | tcp_sw_conn->tx_hash.flags = 0; | |
527 | if (IS_ERR(tcp_sw_conn->tx_hash.tfm)) | |
5d91e209 | 528 | goto free_conn; |
dd8c0d95 | 529 | |
38e1a8f5 MC |
530 | tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
531 | CRYPTO_ALG_ASYNC); | |
532 | tcp_sw_conn->rx_hash.flags = 0; | |
533 | if (IS_ERR(tcp_sw_conn->rx_hash.tfm)) | |
dd8c0d95 | 534 | goto free_tx_tfm; |
38e1a8f5 | 535 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 536 | |
5bb0b55a | 537 | return cls_conn; |
7ba24713 | 538 | |
dd8c0d95 | 539 | free_tx_tfm: |
38e1a8f5 | 540 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 541 | free_conn: |
322d739d MC |
542 | iscsi_conn_printk(KERN_ERR, conn, |
543 | "Could not create connection due to crc32c " | |
544 | "loading error. Make sure the crc32c " | |
545 | "module is built as a module or into the " | |
546 | "kernel\n"); | |
38e1a8f5 | 547 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 548 | return NULL; |
7ba24713 AA |
549 | } |
550 | ||
38e1a8f5 | 551 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 552 | { |
22236961 | 553 | struct iscsi_session *session = conn->session; |
1c83469d | 554 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
555 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
556 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 557 | |
22236961 | 558 | if (!sock) |
1c83469d MC |
559 | return; |
560 | ||
22236961 | 561 | sock_hold(sock->sk); |
38e1a8f5 | 562 | iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn); |
22236961 | 563 | sock_put(sock->sk); |
1c83469d | 564 | |
22236961 | 565 | spin_lock_bh(&session->lock); |
38e1a8f5 | 566 | tcp_sw_conn->sock = NULL; |
22236961 MC |
567 | spin_unlock_bh(&session->lock); |
568 | sockfd_put(sock); | |
1c83469d MC |
569 | } |
570 | ||
38e1a8f5 | 571 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 572 | { |
5bb0b55a MC |
573 | struct iscsi_conn *conn = cls_conn->dd_data; |
574 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 575 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 576 | |
38e1a8f5 | 577 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 578 | |
38e1a8f5 MC |
579 | if (tcp_sw_conn->tx_hash.tfm) |
580 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); | |
581 | if (tcp_sw_conn->rx_hash.tfm) | |
582 | crypto_free_hash(tcp_sw_conn->rx_hash.tfm); | |
7ba24713 | 583 | |
38e1a8f5 | 584 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 585 | } |
7ba24713 | 586 | |
38e1a8f5 | 587 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
588 | { |
589 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 590 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 591 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
913e5bf4 MC |
592 | |
593 | /* userspace may have goofed up and not bound us */ | |
38e1a8f5 | 594 | if (!tcp_sw_conn->sock) |
913e5bf4 MC |
595 | return; |
596 | /* | |
597 | * Make sure our recv side is stopped. | |
598 | * Older tools called conn stop before ep_disconnect | |
599 | * so IO could still be coming in. | |
600 | */ | |
38e1a8f5 | 601 | write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
913e5bf4 | 602 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
38e1a8f5 | 603 | write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock); |
1c83469d MC |
604 | |
605 | iscsi_conn_stop(cls_conn, flag); | |
38e1a8f5 | 606 | iscsi_sw_tcp_release_conn(conn); |
1c83469d MC |
607 | } |
608 | ||
38e1a8f5 MC |
609 | static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
610 | char *buf, int *port, | |
611 | int (*getname)(struct socket *, | |
612 | struct sockaddr *, | |
613 | int *addrlen)) | |
22236961 MC |
614 | { |
615 | struct sockaddr_storage *addr; | |
616 | struct sockaddr_in6 *sin6; | |
617 | struct sockaddr_in *sin; | |
618 | int rc = 0, len; | |
619 | ||
a9204879 | 620 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
621 | if (!addr) |
622 | return -ENOMEM; | |
623 | ||
624 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
625 | rc = -ENODEV; | |
626 | goto free_addr; | |
627 | } | |
628 | ||
629 | switch (addr->ss_family) { | |
630 | case AF_INET: | |
631 | sin = (struct sockaddr_in *)addr; | |
632 | spin_lock_bh(&conn->session->lock); | |
63779436 | 633 | sprintf(buf, "%pI4", &sin->sin_addr.s_addr); |
22236961 MC |
634 | *port = be16_to_cpu(sin->sin_port); |
635 | spin_unlock_bh(&conn->session->lock); | |
636 | break; | |
637 | case AF_INET6: | |
638 | sin6 = (struct sockaddr_in6 *)addr; | |
639 | spin_lock_bh(&conn->session->lock); | |
5b095d98 | 640 | sprintf(buf, "%pI6", &sin6->sin6_addr); |
22236961 MC |
641 | *port = be16_to_cpu(sin6->sin6_port); |
642 | spin_unlock_bh(&conn->session->lock); | |
643 | break; | |
644 | } | |
645 | free_addr: | |
646 | kfree(addr); | |
647 | return rc; | |
648 | } | |
649 | ||
5bb0b55a | 650 | static int |
38e1a8f5 MC |
651 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
652 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
653 | int is_leading) | |
5bb0b55a | 654 | { |
75613521 MC |
655 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
656 | struct iscsi_host *ihost = shost_priv(shost); | |
5bb0b55a MC |
657 | struct iscsi_conn *conn = cls_conn->dd_data; |
658 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 659 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
660 | struct sock *sk; |
661 | struct socket *sock; | |
662 | int err; | |
7ba24713 | 663 | |
5bb0b55a | 664 | /* lookup for existing socket */ |
264faaaa | 665 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 666 | if (!sock) { |
322d739d MC |
667 | iscsi_conn_printk(KERN_ERR, conn, |
668 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 669 | return -EEXIST; |
7ba24713 | 670 | } |
22236961 MC |
671 | /* |
672 | * copy these values now because if we drop the session | |
673 | * userspace may still want to query the values since we will | |
674 | * be using them for the reconnect | |
675 | */ | |
38e1a8f5 MC |
676 | err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address, |
677 | &conn->portal_port, kernel_getpeername); | |
22236961 MC |
678 | if (err) |
679 | goto free_socket; | |
680 | ||
38e1a8f5 MC |
681 | err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address, |
682 | &ihost->local_port, kernel_getsockname); | |
22236961 MC |
683 | if (err) |
684 | goto free_socket; | |
7ba24713 | 685 | |
5bb0b55a MC |
686 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
687 | if (err) | |
22236961 | 688 | goto free_socket; |
7ba24713 | 689 | |
67a61114 | 690 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 691 | tcp_sw_conn->sock = sock; |
7ba24713 | 692 | |
67a61114 MC |
693 | /* setup Socket parameters */ |
694 | sk = sock->sk; | |
695 | sk->sk_reuse = 1; | |
696 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
697 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 698 | |
38e1a8f5 MC |
699 | iscsi_sw_tcp_conn_set_callbacks(conn); |
700 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
701 | /* |
702 | * set receive state machine into initial state | |
703 | */ | |
da32dd68 | 704 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 705 | return 0; |
22236961 MC |
706 | |
707 | free_socket: | |
708 | sockfd_put(sock); | |
709 | return err; | |
7ba24713 AA |
710 | } |
711 | ||
38e1a8f5 MC |
712 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
713 | enum iscsi_param param, char *buf, | |
714 | int buflen) | |
7ba24713 | 715 | { |
7b7232f3 | 716 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 717 | struct iscsi_session *session = conn->session; |
5bb0b55a | 718 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 719 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5c75b7fc | 720 | int value; |
7ba24713 | 721 | |
7ba24713 | 722 | switch(param) { |
7ba24713 | 723 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 724 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
725 | break; |
726 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 727 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
728 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
729 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 730 | break; |
7ba24713 | 731 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 732 | sscanf(buf, "%d", &value); |
df93ffcd MC |
733 | if (value <= 0 || !is_power_of_2(value)) |
734 | return -EINVAL; | |
735 | if (session->max_r2t == value) | |
7ba24713 | 736 | break; |
38e1a8f5 | 737 | iscsi_tcp_r2tpool_free(session); |
5c75b7fc | 738 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 | 739 | if (iscsi_tcp_r2tpool_alloc(session)) |
7ba24713 AA |
740 | return -ENOMEM; |
741 | break; | |
7ba24713 | 742 | default: |
5c75b7fc | 743 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
744 | } |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
38e1a8f5 MC |
749 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
750 | enum iscsi_param param, char *buf) | |
7b8631b5 | 751 | { |
7b7232f3 | 752 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 753 | int len; |
7b8631b5 MC |
754 | |
755 | switch(param) { | |
fd7255f5 | 756 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
757 | spin_lock_bh(&conn->session->lock); |
758 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
759 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 760 | break; |
fd7255f5 | 761 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
762 | spin_lock_bh(&conn->session->lock); |
763 | len = sprintf(buf, "%s\n", conn->portal_address); | |
764 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
765 | break; |
766 | default: | |
5c75b7fc | 767 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
768 | } |
769 | ||
770 | return len; | |
771 | } | |
772 | ||
7ba24713 | 773 | static void |
38e1a8f5 MC |
774 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
775 | struct iscsi_stats *stats) | |
7ba24713 | 776 | { |
7b7232f3 | 777 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 778 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 779 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 780 | |
7ba24713 AA |
781 | stats->custom_length = 3; |
782 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 783 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 784 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 785 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
786 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
787 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
788 | |
789 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
790 | } |
791 | ||
5bb0b55a | 792 | static struct iscsi_cls_session * |
38e1a8f5 | 793 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 794 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 795 | { |
5bb0b55a MC |
796 | struct iscsi_cls_session *cls_session; |
797 | struct iscsi_session *session; | |
06520ede | 798 | struct Scsi_Host *shost; |
7ba24713 | 799 | |
06520ede MC |
800 | if (ep) { |
801 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
802 | return NULL; |
803 | } | |
804 | ||
4d108350 | 805 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1); |
75613521 | 806 | if (!shost) |
5bb0b55a | 807 | return NULL; |
38e1a8f5 | 808 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 809 | shost->cmd_per_lun = qdepth; |
75613521 MC |
810 | shost->max_lun = iscsi_max_lun; |
811 | shost->max_id = 0; | |
812 | shost->max_channel = 0; | |
30e9ba9f | 813 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 814 | |
a4804cd6 | 815 | if (iscsi_host_add(shost, NULL)) |
75613521 | 816 | goto free_host; |
75613521 | 817 | |
38e1a8f5 MC |
818 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
819 | cmds_max, | |
820 | sizeof(struct iscsi_tcp_task) + | |
821 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 822 | initial_cmdsn, 0); |
75613521 MC |
823 | if (!cls_session) |
824 | goto remove_host; | |
825 | session = cls_session->dd_data; | |
7ba24713 | 826 | |
fbc514b4 | 827 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 828 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 829 | goto remove_session; |
5bb0b55a MC |
830 | return cls_session; |
831 | ||
75613521 | 832 | remove_session: |
5bb0b55a | 833 | iscsi_session_teardown(cls_session); |
75613521 | 834 | remove_host: |
a4804cd6 | 835 | iscsi_host_remove(shost); |
75613521 | 836 | free_host: |
a4804cd6 | 837 | iscsi_host_free(shost); |
5bb0b55a MC |
838 | return NULL; |
839 | } | |
840 | ||
38e1a8f5 | 841 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 842 | { |
75613521 MC |
843 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
844 | ||
38e1a8f5 | 845 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 846 | iscsi_session_teardown(cls_session); |
75613521 | 847 | |
a4804cd6 MC |
848 | iscsi_host_remove(shost); |
849 | iscsi_host_free(shost); | |
7ba24713 AA |
850 | } |
851 | ||
091e6dbe PW |
852 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
853 | { | |
854 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
855 | return 0; | |
856 | } | |
857 | ||
38e1a8f5 | 858 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 859 | { |
b6d44fe9 | 860 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
861 | blk_queue_dma_alignment(sdev->request_queue, 0); |
862 | return 0; | |
863 | } | |
864 | ||
38e1a8f5 | 865 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 866 | .module = THIS_MODULE, |
f4246b33 | 867 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
868 | .queuecommand = iscsi_queuecommand, |
869 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 870 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 871 | .sg_tablesize = 4096, |
8231f0ed | 872 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
873 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
874 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 875 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 876 | .eh_target_reset_handler= iscsi_eh_target_reset, |
5bb0b55a | 877 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 878 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 879 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 880 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
881 | .proc_name = "iscsi_tcp", |
882 | .this_id = -1, | |
883 | }; | |
884 | ||
38e1a8f5 | 885 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
886 | .owner = THIS_MODULE, |
887 | .name = "tcp", | |
888 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
889 | | CAP_DATADGST, | |
fd7255f5 MC |
890 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
891 | ISCSI_MAX_XMIT_DLENGTH | | |
892 | ISCSI_HDRDGST_EN | | |
893 | ISCSI_DATADGST_EN | | |
894 | ISCSI_INITIAL_R2T_EN | | |
895 | ISCSI_MAX_R2T | | |
896 | ISCSI_IMM_DATA_EN | | |
897 | ISCSI_FIRST_BURST | | |
898 | ISCSI_MAX_BURST | | |
899 | ISCSI_PDU_INORDER_EN | | |
900 | ISCSI_DATASEQ_INORDER_EN | | |
901 | ISCSI_ERL | | |
902 | ISCSI_CONN_PORT | | |
8d2860b3 | 903 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
904 | ISCSI_EXP_STATSN | |
905 | ISCSI_PERSISTENT_PORT | | |
906 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
907 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
908 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 909 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c MC |
910 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
911 | ISCSI_LU_RESET_TMO | | |
88dfd340 MC |
912 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
913 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
22236961 | 914 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
915 | ISCSI_HOST_INITIATOR_NAME | |
916 | ISCSI_HOST_NETDEV_NAME, | |
5bb0b55a | 917 | /* session management */ |
38e1a8f5 MC |
918 | .create_session = iscsi_sw_tcp_session_create, |
919 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 920 | /* connection management */ |
38e1a8f5 MC |
921 | .create_conn = iscsi_sw_tcp_conn_create, |
922 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
923 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
924 | .set_param = iscsi_sw_tcp_conn_set_param, | |
925 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 926 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 927 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 928 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 929 | /* iscsi host params */ |
75613521 | 930 | .get_host_param = iscsi_host_get_param, |
0801c242 | 931 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 932 | /* IO */ |
7ba24713 | 933 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 934 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 935 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
936 | .init_task = iscsi_tcp_task_init, |
937 | .xmit_task = iscsi_tcp_task_xmit, | |
938 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 939 | /* low level pdu helpers */ |
38e1a8f5 MC |
940 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
941 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
942 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 943 | /* recovery */ |
30a6c652 | 944 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
945 | }; |
946 | ||
38e1a8f5 | 947 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 948 | { |
7ba24713 | 949 | if (iscsi_max_lun < 1) { |
be2df72e OG |
950 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
951 | iscsi_max_lun); | |
7ba24713 AA |
952 | return -EINVAL; |
953 | } | |
7ba24713 | 954 | |
38e1a8f5 MC |
955 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
956 | &iscsi_sw_tcp_transport); | |
957 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 958 | return -ENODEV; |
7ba24713 | 959 | |
7b8631b5 | 960 | return 0; |
7ba24713 AA |
961 | } |
962 | ||
38e1a8f5 | 963 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 964 | { |
38e1a8f5 | 965 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
966 | } |
967 | ||
38e1a8f5 MC |
968 | module_init(iscsi_sw_tcp_init); |
969 | module_exit(iscsi_sw_tcp_exit); |