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> | |
30 | #include <linux/list.h> | |
31 | #include <linux/inet.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 | ||
47 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
48 | "Alex Aizman <itn780@yahoo.com>"); | |
49 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
50 | MODULE_LICENSE("GPL"); | |
da32dd68 | 51 | #undef DEBUG_TCP |
7ba24713 AA |
52 | #define DEBUG_ASSERT |
53 | ||
54 | #ifdef DEBUG_TCP | |
5bb0b55a | 55 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
56 | #else |
57 | #define debug_tcp(fmt...) | |
58 | #endif | |
59 | ||
75613521 MC |
60 | static struct scsi_transport_template *iscsi_tcp_scsi_transport; |
61 | static struct scsi_host_template iscsi_sht; | |
62 | static struct iscsi_transport iscsi_tcp_transport; | |
63 | ||
7ba24713 AA |
64 | static unsigned int iscsi_max_lun = 512; |
65 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
66 | ||
da32dd68 | 67 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, |
a8ac6311 | 68 | struct iscsi_segment *segment); |
7ba24713 | 69 | |
da32dd68 | 70 | /* |
a8ac6311 | 71 | * Scatterlist handling: inside the iscsi_segment, we |
da32dd68 OK |
72 | * remember an index into the scatterlist, and set data/size |
73 | * to the current scatterlist entry. For highmem pages, we | |
74 | * kmap as needed. | |
75 | * | |
76 | * Note that the page is unmapped when we return from | |
77 | * TCP's data_ready handler, so we may end up mapping and | |
78 | * unmapping the same page repeatedly. The whole reason | |
79 | * for this is that we shouldn't keep the page mapped | |
80 | * outside the softirq. | |
81 | */ | |
82 | ||
83 | /** | |
a8ac6311 OK |
84 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry |
85 | * @segment: the buffer object | |
86 | * @sg: scatterlist | |
da32dd68 OK |
87 | * @offset: byte offset into that sg entry |
88 | * | |
a8ac6311 | 89 | * This function sets up the segment so that subsequent |
da32dd68 OK |
90 | * data is copied to the indicated sg entry, at the given |
91 | * offset. | |
92 | */ | |
93 | static inline void | |
a8ac6311 OK |
94 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, |
95 | struct scatterlist *sg, unsigned int offset) | |
da32dd68 | 96 | { |
a8ac6311 OK |
97 | segment->sg = sg; |
98 | segment->sg_offset = offset; | |
99 | segment->size = min(sg->length - offset, | |
100 | segment->total_size - segment->total_copied); | |
101 | segment->data = NULL; | |
da32dd68 OK |
102 | } |
103 | ||
104 | /** | |
a8ac6311 OK |
105 | * iscsi_tcp_segment_map - map the current S/G page |
106 | * @segment: iscsi_segment | |
107 | * @recv: 1 if called from recv path | |
da32dd68 OK |
108 | * |
109 | * We only need to possibly kmap data if scatter lists are being used, | |
110 | * because the iscsi passthrough and internal IO paths will never use high | |
111 | * mem pages. | |
112 | */ | |
113 | static inline void | |
a8ac6311 | 114 | iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) |
da32dd68 OK |
115 | { |
116 | struct scatterlist *sg; | |
117 | ||
a8ac6311 | 118 | if (segment->data != NULL || !segment->sg) |
da32dd68 OK |
119 | return; |
120 | ||
a8ac6311 OK |
121 | sg = segment->sg; |
122 | BUG_ON(segment->sg_mapped); | |
da32dd68 | 123 | BUG_ON(sg->length == 0); |
a8ac6311 OK |
124 | |
125 | /* | |
126 | * If the page count is greater than one it is ok to send | |
127 | * to the network layer's zero copy send path. If not we | |
128 | * have to go the slow sendmsg path. We always map for the | |
129 | * recv path. | |
130 | */ | |
131 | if (page_count(sg_page(sg)) >= 1 && !recv) | |
132 | return; | |
133 | ||
134 | debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit", | |
135 | segment); | |
136 | segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0); | |
137 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; | |
da32dd68 OK |
138 | } |
139 | ||
140 | static inline void | |
a8ac6311 | 141 | iscsi_tcp_segment_unmap(struct iscsi_segment *segment) |
da32dd68 | 142 | { |
a8ac6311 OK |
143 | debug_tcp("iscsi_tcp_segment_unmap %p\n", segment); |
144 | ||
145 | if (segment->sg_mapped) { | |
146 | debug_tcp("iscsi_tcp_segment_unmap valid\n"); | |
147 | kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0); | |
148 | segment->sg_mapped = NULL; | |
149 | segment->data = NULL; | |
da32dd68 OK |
150 | } |
151 | } | |
152 | ||
153 | /* | |
154 | * Splice the digest buffer into the buffer | |
155 | */ | |
156 | static inline void | |
a8ac6311 | 157 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) |
da32dd68 | 158 | { |
a8ac6311 OK |
159 | segment->data = digest; |
160 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
161 | segment->total_size += ISCSI_DIGEST_SIZE; | |
162 | segment->size = ISCSI_DIGEST_SIZE; | |
163 | segment->copied = 0; | |
164 | segment->sg = NULL; | |
165 | segment->hash = NULL; | |
da32dd68 OK |
166 | } |
167 | ||
168 | /** | |
a8ac6311 OK |
169 | * iscsi_tcp_segment_done - check whether the segment is complete |
170 | * @segment: iscsi segment to check | |
171 | * @recv: set to one of this is called from the recv path | |
172 | * @copied: number of bytes copied | |
da32dd68 | 173 | * |
a8ac6311 | 174 | * Check if we're done receiving this segment. If the receive |
da32dd68 OK |
175 | * buffer is full but we expect more data, move on to the |
176 | * next entry in the scatterlist. | |
177 | * | |
178 | * If the amount of data we received isn't a multiple of 4, | |
179 | * we will transparently receive the pad bytes, too. | |
180 | * | |
181 | * This function must be re-entrant. | |
182 | */ | |
7ba24713 | 183 | static inline int |
a8ac6311 | 184 | iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied) |
7ba24713 | 185 | { |
da32dd68 | 186 | static unsigned char padbuf[ISCSI_PAD_LEN]; |
a8ac6311 | 187 | struct scatterlist sg; |
004d6530 | 188 | unsigned int pad; |
da32dd68 | 189 | |
a8ac6311 OK |
190 | debug_tcp("copied %u %u size %u %s\n", segment->copied, copied, |
191 | segment->size, recv ? "recv" : "xmit"); | |
192 | if (segment->hash && copied) { | |
193 | /* | |
194 | * If a segment is kmapd we must unmap it before sending | |
195 | * to the crypto layer since that will try to kmap it again. | |
196 | */ | |
197 | iscsi_tcp_segment_unmap(segment); | |
198 | ||
199 | if (!segment->data) { | |
200 | sg_init_table(&sg, 1); | |
201 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
202 | segment->copied + segment->sg_offset + | |
203 | segment->sg->offset); | |
204 | } else | |
205 | sg_init_one(&sg, segment->data + segment->copied, | |
206 | copied); | |
207 | crypto_hash_update(segment->hash, &sg, copied); | |
208 | } | |
209 | ||
210 | segment->copied += copied; | |
211 | if (segment->copied < segment->size) { | |
212 | iscsi_tcp_segment_map(segment, recv); | |
da32dd68 OK |
213 | return 0; |
214 | } | |
7ba24713 | 215 | |
a8ac6311 OK |
216 | segment->total_copied += segment->copied; |
217 | segment->copied = 0; | |
218 | segment->size = 0; | |
7ba24713 | 219 | |
da32dd68 | 220 | /* Unmap the current scatterlist page, if there is one. */ |
a8ac6311 | 221 | iscsi_tcp_segment_unmap(segment); |
da32dd68 OK |
222 | |
223 | /* Do we have more scatterlist entries? */ | |
a8ac6311 OK |
224 | debug_tcp("total copied %u total size %u\n", segment->total_copied, |
225 | segment->total_size); | |
226 | if (segment->total_copied < segment->total_size) { | |
da32dd68 | 227 | /* Proceed to the next entry in the scatterlist. */ |
a8ac6311 OK |
228 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), |
229 | 0); | |
230 | iscsi_tcp_segment_map(segment, recv); | |
231 | BUG_ON(segment->size == 0); | |
da32dd68 OK |
232 | return 0; |
233 | } | |
234 | ||
235 | /* Do we need to handle padding? */ | |
a8ac6311 | 236 | pad = iscsi_padding(segment->total_copied); |
004d6530 | 237 | if (pad != 0) { |
da32dd68 | 238 | debug_tcp("consume %d pad bytes\n", pad); |
a8ac6311 OK |
239 | segment->total_size += pad; |
240 | segment->size = pad; | |
241 | segment->data = padbuf; | |
da32dd68 OK |
242 | return 0; |
243 | } | |
244 | ||
245 | /* | |
a8ac6311 | 246 | * Set us up for transferring the data digest. hdr digest |
da32dd68 OK |
247 | * is completely handled in hdr done function. |
248 | */ | |
a8ac6311 OK |
249 | if (segment->hash) { |
250 | crypto_hash_final(segment->hash, segment->digest); | |
251 | iscsi_tcp_segment_splice_digest(segment, | |
252 | recv ? segment->recv_digest : segment->digest); | |
253 | return 0; | |
da32dd68 | 254 | } |
7ba24713 | 255 | |
da32dd68 OK |
256 | return 1; |
257 | } | |
7ba24713 | 258 | |
da32dd68 | 259 | /** |
a8ac6311 | 260 | * iscsi_tcp_xmit_segment - transmit segment |
da32dd68 | 261 | * @tcp_conn: the iSCSI TCP connection |
a8ac6311 OK |
262 | * @segment: the buffer to transmnit |
263 | * | |
264 | * This function transmits as much of the buffer as | |
265 | * the network layer will accept, and returns the number of | |
266 | * bytes transmitted. | |
267 | * | |
268 | * If CRC hashing is enabled, the function will compute the | |
269 | * hash as it goes. When the entire segment has been transmitted, | |
270 | * it will retrieve the hash value and send it as well. | |
271 | */ | |
272 | static int | |
273 | iscsi_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, | |
274 | struct iscsi_segment *segment) | |
275 | { | |
276 | struct socket *sk = tcp_conn->sock; | |
277 | unsigned int copied = 0; | |
278 | int r = 0; | |
279 | ||
280 | while (!iscsi_tcp_segment_done(segment, 0, r)) { | |
281 | struct scatterlist *sg; | |
282 | unsigned int offset, copy; | |
283 | int flags = 0; | |
284 | ||
285 | r = 0; | |
286 | offset = segment->copied; | |
287 | copy = segment->size - offset; | |
288 | ||
289 | if (segment->total_copied + segment->size < segment->total_size) | |
290 | flags |= MSG_MORE; | |
291 | ||
292 | /* Use sendpage if we can; else fall back to sendmsg */ | |
293 | if (!segment->data) { | |
294 | sg = segment->sg; | |
295 | offset += segment->sg_offset + sg->offset; | |
296 | r = tcp_conn->sendpage(sk, sg_page(sg), offset, copy, | |
297 | flags); | |
298 | } else { | |
299 | struct msghdr msg = { .msg_flags = flags }; | |
300 | struct kvec iov = { | |
301 | .iov_base = segment->data + offset, | |
302 | .iov_len = copy | |
303 | }; | |
304 | ||
305 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
306 | } | |
307 | ||
308 | if (r < 0) { | |
309 | iscsi_tcp_segment_unmap(segment); | |
310 | if (copied || r == -EAGAIN) | |
311 | break; | |
312 | return r; | |
313 | } | |
314 | copied += r; | |
315 | } | |
316 | return copied; | |
317 | } | |
318 | ||
319 | /** | |
320 | * iscsi_tcp_segment_recv - copy data to segment | |
321 | * @tcp_conn: the iSCSI TCP connection | |
322 | * @segment: the buffer to copy to | |
da32dd68 OK |
323 | * @ptr: data pointer |
324 | * @len: amount of data available | |
325 | * | |
326 | * This function copies up to @len bytes to the | |
327 | * given buffer, and returns the number of bytes | |
328 | * consumed, which can actually be less than @len. | |
329 | * | |
330 | * If hash digest is enabled, the function will update the | |
331 | * hash while copying. | |
332 | * Combining these two operations doesn't buy us a lot (yet), | |
333 | * but in the future we could implement combined copy+crc, | |
334 | * just way we do for network layer checksums. | |
335 | */ | |
336 | static int | |
a8ac6311 OK |
337 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, |
338 | struct iscsi_segment *segment, const void *ptr, | |
339 | unsigned int len) | |
da32dd68 | 340 | { |
a8ac6311 | 341 | unsigned int copy = 0, copied = 0; |
7ba24713 | 342 | |
a8ac6311 OK |
343 | while (!iscsi_tcp_segment_done(segment, 1, copy)) { |
344 | if (copied == len) { | |
345 | debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n", | |
346 | len); | |
347 | break; | |
da32dd68 | 348 | } |
a8ac6311 OK |
349 | |
350 | copy = min(len - copied, segment->size - segment->copied); | |
351 | debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy); | |
352 | memcpy(segment->data + segment->copied, ptr + copied, copy); | |
da32dd68 OK |
353 | copied += copy; |
354 | } | |
da32dd68 OK |
355 | return copied; |
356 | } | |
357 | ||
358 | static inline void | |
359 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
360 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
361 | { | |
362 | struct scatterlist sg; | |
7ba24713 | 363 | |
da32dd68 OK |
364 | sg_init_one(&sg, hdr, hdrlen); |
365 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
366 | } | |
367 | ||
368 | static inline int | |
369 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 370 | struct iscsi_segment *segment) |
da32dd68 | 371 | { |
a8ac6311 | 372 | if (!segment->digest_len) |
da32dd68 OK |
373 | return 1; |
374 | ||
a8ac6311 OK |
375 | if (memcmp(segment->recv_digest, segment->digest, |
376 | segment->digest_len)) { | |
da32dd68 OK |
377 | debug_scsi("digest mismatch\n"); |
378 | return 0; | |
379 | } | |
380 | ||
381 | return 1; | |
382 | } | |
383 | ||
384 | /* | |
a8ac6311 | 385 | * Helper function to set up segment buffer |
da32dd68 OK |
386 | */ |
387 | static inline void | |
a8ac6311 OK |
388 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, |
389 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
da32dd68 | 390 | { |
a8ac6311 OK |
391 | memset(segment, 0, sizeof(*segment)); |
392 | segment->total_size = size; | |
393 | segment->done = done; | |
da32dd68 OK |
394 | |
395 | if (hash) { | |
a8ac6311 | 396 | segment->hash = hash; |
da32dd68 OK |
397 | crypto_hash_init(hash); |
398 | } | |
399 | } | |
400 | ||
401 | static inline void | |
a8ac6311 OK |
402 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, |
403 | size_t size, iscsi_segment_done_fn_t *done, | |
404 | struct hash_desc *hash) | |
da32dd68 | 405 | { |
a8ac6311 OK |
406 | __iscsi_segment_init(segment, size, done, hash); |
407 | segment->data = data; | |
408 | segment->size = size; | |
da32dd68 OK |
409 | } |
410 | ||
411 | static inline int | |
a8ac6311 OK |
412 | iscsi_segment_seek_sg(struct iscsi_segment *segment, |
413 | struct scatterlist *sg_list, unsigned int sg_count, | |
414 | unsigned int offset, size_t size, | |
415 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
da32dd68 | 416 | { |
a8ac6311 | 417 | struct scatterlist *sg; |
da32dd68 OK |
418 | unsigned int i; |
419 | ||
a8ac6311 OK |
420 | debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n", |
421 | offset, size); | |
422 | __iscsi_segment_init(segment, size, done, hash); | |
423 | for_each_sg(sg_list, sg, sg_count, i) { | |
424 | debug_scsi("sg %d, len %u offset %u\n", i, sg->length, | |
425 | sg->offset); | |
426 | if (offset < sg->length) { | |
427 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
da32dd68 | 428 | return 0; |
7ba24713 | 429 | } |
a8ac6311 | 430 | offset -= sg->length; |
7ba24713 AA |
431 | } |
432 | ||
da32dd68 OK |
433 | return ISCSI_ERR_DATA_OFFSET; |
434 | } | |
435 | ||
436 | /** | |
a8ac6311 | 437 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception |
da32dd68 OK |
438 | * @tcp_conn: iscsi connection to prep for |
439 | * | |
440 | * This function always passes NULL for the hash argument, because when this | |
441 | * function is called we do not yet know the final size of the header and want | |
442 | * to delay the digest processing until we know that. | |
443 | */ | |
444 | static void | |
445 | iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
446 | { | |
447 | debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn, | |
448 | tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : ""); | |
a8ac6311 | 449 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
da32dd68 OK |
450 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), |
451 | iscsi_tcp_hdr_recv_done, NULL); | |
452 | } | |
453 | ||
454 | /* | |
455 | * Handle incoming reply to any other type of command | |
456 | */ | |
457 | static int | |
458 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 459 | struct iscsi_segment *segment) |
da32dd68 OK |
460 | { |
461 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
462 | int rc = 0; | |
463 | ||
a8ac6311 | 464 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
da32dd68 OK |
465 | return ISCSI_ERR_DATA_DGST; |
466 | ||
467 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
468 | conn->data, tcp_conn->in.datalen); | |
469 | if (rc) | |
470 | return rc; | |
471 | ||
472 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
473 | return 0; |
474 | } | |
475 | ||
da32dd68 OK |
476 | static void |
477 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
478 | { | |
479 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
480 | struct hash_desc *rx_hash = NULL; | |
481 | ||
63c62f1c MC |
482 | if (conn->datadgst_en & |
483 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
da32dd68 OK |
484 | rx_hash = &tcp_conn->rx_hash; |
485 | ||
a8ac6311 | 486 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
da32dd68 OK |
487 | conn->data, tcp_conn->in.datalen, |
488 | iscsi_tcp_data_recv_done, rx_hash); | |
489 | } | |
490 | ||
30a6c652 MC |
491 | /* |
492 | * must be called with session lock | |
493 | */ | |
e5a7efef | 494 | static void iscsi_tcp_cleanup_task(struct iscsi_task *task) |
7ba24713 | 495 | { |
135a8ad4 | 496 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
b6c395ed | 497 | struct iscsi_r2t_info *r2t; |
7ba24713 | 498 | |
e5a7efef MC |
499 | /* nothing to do for mgmt or pending tasks */ |
500 | if (!task->sc || task->state == ISCSI_TASK_PENDING) | |
fbc514b4 MC |
501 | return; |
502 | ||
135a8ad4 MC |
503 | /* flush task's r2t queues */ |
504 | while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
505 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
b6c395ed | 506 | sizeof(void*)); |
135a8ad4 | 507 | debug_scsi("iscsi_tcp_cleanup_task pending r2t dropped\n"); |
b6c395ed MC |
508 | } |
509 | ||
135a8ad4 | 510 | r2t = tcp_task->r2t; |
a8ac6311 | 511 | if (r2t != NULL) { |
135a8ad4 | 512 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, |
a8ac6311 | 513 | sizeof(void*)); |
135a8ad4 | 514 | tcp_task->r2t = NULL; |
a8ac6311 | 515 | } |
7ba24713 AA |
516 | } |
517 | ||
518 | /** | |
30b49150 | 519 | * iscsi_tcp_data_in - SCSI Data-In Response processing |
7ba24713 | 520 | * @conn: iscsi connection |
135a8ad4 | 521 | * @task: scsi command task |
30b49150 MC |
522 | */ |
523 | static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) | |
7ba24713 | 524 | { |
5bb0b55a | 525 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
135a8ad4 | 526 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
5bb0b55a | 527 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; |
7ba24713 | 528 | int datasn = be32_to_cpu(rhdr->datasn); |
1d9edf02 | 529 | unsigned total_in_length = scsi_in(task->sc)->length; |
7ba24713 | 530 | |
1d9edf02 | 531 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr); |
5bb0b55a | 532 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
533 | return 0; |
534 | ||
135a8ad4 MC |
535 | if (tcp_task->exp_datasn != datasn) { |
536 | debug_tcp("%s: task->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
3a12b199 | 537 | __func__, tcp_task->exp_datasn, datasn); |
7ba24713 | 538 | return ISCSI_ERR_DATASN; |
d473cc7f | 539 | } |
7ba24713 | 540 | |
135a8ad4 | 541 | tcp_task->exp_datasn++; |
7ba24713 | 542 | |
135a8ad4 MC |
543 | tcp_task->data_offset = be32_to_cpu(rhdr->offset); |
544 | if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) { | |
857ae0bd | 545 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", |
3a12b199 | 546 | __func__, tcp_task->data_offset, |
94795b61 | 547 | tcp_conn->in.datalen, total_in_length); |
7ba24713 | 548 | return ISCSI_ERR_DATA_OFFSET; |
857ae0bd | 549 | } |
7ba24713 | 550 | |
7ba24713 AA |
551 | conn->datain_pdus_cnt++; |
552 | return 0; | |
553 | } | |
554 | ||
7ba24713 | 555 | /** |
30b49150 | 556 | * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing |
7ba24713 | 557 | * @conn: iscsi connection |
135a8ad4 | 558 | * @task: scsi command task |
30b49150 MC |
559 | */ |
560 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) | |
7ba24713 | 561 | { |
7ba24713 | 562 | struct iscsi_session *session = conn->session; |
135a8ad4 | 563 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
5bb0b55a MC |
564 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
565 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
e5a7efef | 566 | struct iscsi_r2t_info *r2t; |
7ba24713 AA |
567 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
568 | int rc; | |
569 | ||
98a9416a | 570 | if (tcp_conn->in.datalen) { |
322d739d MC |
571 | iscsi_conn_printk(KERN_ERR, conn, |
572 | "invalid R2t with datalen %d\n", | |
573 | tcp_conn->in.datalen); | |
7ba24713 | 574 | return ISCSI_ERR_DATALEN; |
98a9416a | 575 | } |
7ba24713 | 576 | |
135a8ad4 MC |
577 | if (tcp_task->exp_datasn != r2tsn){ |
578 | debug_tcp("%s: task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
3a12b199 | 579 | __func__, tcp_task->exp_datasn, r2tsn); |
7ba24713 | 580 | return ISCSI_ERR_R2TSN; |
d473cc7f | 581 | } |
7ba24713 | 582 | |
135a8ad4 | 583 | /* fill-in new R2T associated with the task */ |
77a23c21 MC |
584 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
585 | ||
135a8ad4 | 586 | if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) { |
322d739d MC |
587 | iscsi_conn_printk(KERN_INFO, conn, |
588 | "dropping R2T itt %d in recovery.\n", | |
135a8ad4 | 589 | task->itt); |
7ba24713 AA |
590 | return 0; |
591 | } | |
b6c395ed | 592 | |
135a8ad4 | 593 | rc = __kfifo_get(tcp_task->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
e5a7efef MC |
594 | if (!rc) { |
595 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
596 | "Target has sent more R2Ts than it " | |
597 | "negotiated for or driver has has leaked.\n"); | |
598 | return ISCSI_ERR_PROTO; | |
599 | } | |
7ba24713 AA |
600 | |
601 | r2t->exp_statsn = rhdr->statsn; | |
602 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a | 603 | if (r2t->data_length == 0) { |
322d739d MC |
604 | iscsi_conn_printk(KERN_ERR, conn, |
605 | "invalid R2T with zero data len\n"); | |
135a8ad4 | 606 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, |
03766a1d | 607 | sizeof(void*)); |
7ba24713 AA |
608 | return ISCSI_ERR_DATALEN; |
609 | } | |
610 | ||
98a9416a MC |
611 | if (r2t->data_length > session->max_burst) |
612 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
613 | "Attempting to execute request.\n", | |
614 | r2t->data_length, session->max_burst); | |
615 | ||
7ba24713 | 616 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
135a8ad4 | 617 | if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) { |
322d739d MC |
618 | iscsi_conn_printk(KERN_ERR, conn, |
619 | "invalid R2T with data len %u at offset %u " | |
620 | "and total length %d\n", r2t->data_length, | |
135a8ad4 MC |
621 | r2t->data_offset, scsi_out(task->sc)->length); |
622 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
03766a1d | 623 | sizeof(void*)); |
7ba24713 AA |
624 | return ISCSI_ERR_DATALEN; |
625 | } | |
626 | ||
627 | r2t->ttt = rhdr->ttt; /* no flip */ | |
e5a7efef MC |
628 | r2t->datasn = 0; |
629 | r2t->sent = 0; | |
7ba24713 | 630 | |
135a8ad4 MC |
631 | tcp_task->exp_datasn = r2tsn + 1; |
632 | __kfifo_put(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); | |
7ba24713 | 633 | conn->r2t_pdus_cnt++; |
843c0a8a | 634 | |
135a8ad4 | 635 | iscsi_requeue_task(task); |
7ba24713 AA |
636 | return 0; |
637 | } | |
638 | ||
da32dd68 OK |
639 | /* |
640 | * Handle incoming reply to DataIn command | |
641 | */ | |
642 | static int | |
643 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 644 | struct iscsi_segment *segment) |
da32dd68 OK |
645 | { |
646 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
647 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
648 | int rc; | |
649 | ||
a8ac6311 | 650 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
da32dd68 OK |
651 | return ISCSI_ERR_DATA_DGST; |
652 | ||
653 | /* check for non-exceptional status */ | |
654 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
655 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
656 | if (rc) | |
657 | return rc; | |
658 | } | |
659 | ||
660 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | /** | |
665 | * iscsi_tcp_hdr_dissect - process PDU header | |
666 | * @conn: iSCSI connection | |
667 | * @hdr: PDU header | |
668 | * | |
669 | * This function analyzes the header of the PDU received, | |
670 | * and performs several sanity checks. If the PDU is accompanied | |
671 | * by data, the receive buffer is set up to copy the incoming data | |
672 | * to the correct location. | |
673 | */ | |
7ba24713 | 674 | static int |
da32dd68 | 675 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
7ba24713 | 676 | { |
5bb0b55a | 677 | int rc = 0, opcode, ahslen; |
5bb0b55a | 678 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
135a8ad4 | 679 | struct iscsi_task *task; |
7ba24713 AA |
680 | |
681 | /* verify PDU length */ | |
5bb0b55a MC |
682 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
683 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
322d739d MC |
684 | iscsi_conn_printk(KERN_ERR, conn, |
685 | "iscsi_tcp: datalen %d > %d\n", | |
686 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
7ba24713 AA |
687 | return ISCSI_ERR_DATALEN; |
688 | } | |
7ba24713 | 689 | |
da32dd68 OK |
690 | /* Additional header segments. So far, we don't |
691 | * process additional headers. | |
692 | */ | |
5bb0b55a | 693 | ahslen = hdr->hlength << 2; |
7ba24713 | 694 | |
5bb0b55a | 695 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 696 | /* verify itt (itt encoding: age+cid+itt) */ |
0af967f5 | 697 | rc = iscsi_verify_itt(conn, hdr->itt); |
7a53dc52 | 698 | if (rc) |
5bb0b55a | 699 | return rc; |
7ba24713 | 700 | |
da32dd68 OK |
701 | debug_tcp("opcode 0x%x ahslen %d datalen %d\n", |
702 | opcode, ahslen, tcp_conn->in.datalen); | |
7ba24713 | 703 | |
5bb0b55a MC |
704 | switch(opcode) { |
705 | case ISCSI_OP_SCSI_DATA_IN: | |
913e5bf4 | 706 | spin_lock(&conn->session->lock); |
135a8ad4 MC |
707 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
708 | if (!task) | |
913e5bf4 MC |
709 | rc = ISCSI_ERR_BAD_ITT; |
710 | else | |
30b49150 | 711 | rc = iscsi_tcp_data_in(conn, task); |
913e5bf4 MC |
712 | if (rc) { |
713 | spin_unlock(&conn->session->lock); | |
714 | break; | |
715 | } | |
0af967f5 | 716 | |
da32dd68 | 717 | if (tcp_conn->in.datalen) { |
135a8ad4 | 718 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
da32dd68 | 719 | struct hash_desc *rx_hash = NULL; |
135a8ad4 | 720 | struct scsi_data_buffer *sdb = scsi_in(task->sc); |
da32dd68 OK |
721 | |
722 | /* | |
723 | * Setup copy of Data-In into the Scsi_Cmnd | |
724 | * Scatterlist case: | |
a8ac6311 | 725 | * We set up the iscsi_segment to point to the next |
da32dd68 OK |
726 | * scatterlist entry to copy to. As we go along, |
727 | * we move on to the next scatterlist entry and | |
728 | * update the digest per-entry. | |
729 | */ | |
63c62f1c MC |
730 | if (conn->datadgst_en && |
731 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
da32dd68 OK |
732 | rx_hash = &tcp_conn->rx_hash; |
733 | ||
734 | debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, " | |
735 | "datalen=%d)\n", tcp_conn, | |
135a8ad4 | 736 | tcp_task->data_offset, |
da32dd68 | 737 | tcp_conn->in.datalen); |
913e5bf4 MC |
738 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
739 | sdb->table.sgl, | |
740 | sdb->table.nents, | |
741 | tcp_task->data_offset, | |
742 | tcp_conn->in.datalen, | |
743 | iscsi_tcp_process_data_in, | |
744 | rx_hash); | |
745 | spin_unlock(&conn->session->lock); | |
746 | return rc; | |
da32dd68 | 747 | } |
913e5bf4 MC |
748 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
749 | spin_unlock(&conn->session->lock); | |
750 | break; | |
5bb0b55a | 751 | case ISCSI_OP_SCSI_CMD_RSP: |
da32dd68 OK |
752 | if (tcp_conn->in.datalen) { |
753 | iscsi_tcp_data_recv_prep(tcp_conn); | |
754 | return 0; | |
755 | } | |
756 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
5bb0b55a MC |
757 | break; |
758 | case ISCSI_OP_R2T: | |
913e5bf4 | 759 | spin_lock(&conn->session->lock); |
135a8ad4 MC |
760 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
761 | if (!task) | |
913e5bf4 MC |
762 | rc = ISCSI_ERR_BAD_ITT; |
763 | else if (ahslen) | |
5bb0b55a | 764 | rc = ISCSI_ERR_AHSLEN; |
913e5bf4 | 765 | else if (task->sc->sc_data_direction == DMA_TO_DEVICE) |
30b49150 | 766 | rc = iscsi_tcp_r2t_rsp(conn, task); |
913e5bf4 | 767 | else |
5bb0b55a | 768 | rc = ISCSI_ERR_PROTO; |
913e5bf4 | 769 | spin_unlock(&conn->session->lock); |
5bb0b55a MC |
770 | break; |
771 | case ISCSI_OP_LOGIN_RSP: | |
772 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
773 | case ISCSI_OP_REJECT: |
774 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
775 | /* |
776 | * It is possible that we could get a PDU with a buffer larger | |
777 | * than 8K, but there are no targets that currently do this. | |
778 | * For now we fail until we find a vendor that needs it | |
779 | */ | |
da32dd68 | 780 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { |
322d739d MC |
781 | iscsi_conn_printk(KERN_ERR, conn, |
782 | "iscsi_tcp: received buffer of " | |
783 | "len %u but conn buffer is only %u " | |
784 | "(opcode %0x)\n", | |
785 | tcp_conn->in.datalen, | |
786 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
c8dc1e52 MC |
787 | rc = ISCSI_ERR_PROTO; |
788 | break; | |
789 | } | |
790 | ||
da32dd68 OK |
791 | /* If there's data coming in with the response, |
792 | * receive it to the connection's buffer. | |
793 | */ | |
794 | if (tcp_conn->in.datalen) { | |
795 | iscsi_tcp_data_recv_prep(tcp_conn); | |
796 | return 0; | |
797 | } | |
5bb0b55a | 798 | /* fall through */ |
c8dc1e52 MC |
799 | case ISCSI_OP_LOGOUT_RSP: |
800 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
801 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
802 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
803 | break; | |
804 | default: | |
805 | rc = ISCSI_ERR_BAD_OPCODE; | |
806 | break; | |
807 | } | |
7ba24713 | 808 | |
da32dd68 OK |
809 | if (rc == 0) { |
810 | /* Anything that comes with data should have | |
811 | * been handled above. */ | |
812 | if (tcp_conn->in.datalen) | |
813 | return ISCSI_ERR_PROTO; | |
814 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
815 | } |
816 | ||
da32dd68 | 817 | return rc; |
7ba24713 AA |
818 | } |
819 | ||
da32dd68 OK |
820 | /** |
821 | * iscsi_tcp_hdr_recv_done - process PDU header | |
822 | * | |
823 | * This is the callback invoked when the PDU header has | |
824 | * been received. If the header is followed by additional | |
825 | * header segments, we go back for more data. | |
826 | */ | |
827 | static int | |
828 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 829 | struct iscsi_segment *segment) |
7ba24713 | 830 | { |
da32dd68 OK |
831 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; |
832 | struct iscsi_hdr *hdr; | |
7ba24713 | 833 | |
da32dd68 OK |
834 | /* Check if there are additional header segments |
835 | * *prior* to computing the digest, because we | |
836 | * may need to go back to the caller for more. | |
837 | */ | |
838 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
a8ac6311 | 839 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { |
da32dd68 OK |
840 | /* Bump the header length - the caller will |
841 | * just loop around and get the AHS for us, and | |
842 | * call again. */ | |
843 | unsigned int ahslen = hdr->hlength << 2; | |
844 | ||
845 | /* Make sure we don't overflow */ | |
846 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
847 | return ISCSI_ERR_AHSLEN; | |
848 | ||
a8ac6311 OK |
849 | segment->total_size += ahslen; |
850 | segment->size += ahslen; | |
da32dd68 | 851 | return 0; |
7ba24713 AA |
852 | } |
853 | ||
da32dd68 OK |
854 | /* We're done processing the header. See if we're doing |
855 | * header digests; if so, set up the recv_digest buffer | |
856 | * and go back for more. */ | |
857 | if (conn->hdrdgst_en) { | |
a8ac6311 | 858 | if (segment->digest_len == 0) { |
63c62f1c MC |
859 | /* |
860 | * Even if we offload the digest processing we | |
861 | * splice it in so we can increment the skb/segment | |
862 | * counters in preparation for the data segment. | |
863 | */ | |
a8ac6311 OK |
864 | iscsi_tcp_segment_splice_digest(segment, |
865 | segment->recv_digest); | |
da32dd68 | 866 | return 0; |
7ba24713 AA |
867 | } |
868 | ||
63c62f1c MC |
869 | if (!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { |
870 | iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr, | |
871 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
872 | segment->digest); | |
873 | ||
874 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
875 | return ISCSI_ERR_HDR_DGST; | |
876 | } | |
7ba24713 | 877 | } |
da32dd68 OK |
878 | |
879 | tcp_conn->in.hdr = hdr; | |
880 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
7ba24713 AA |
881 | } |
882 | ||
63c62f1c MC |
883 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) |
884 | { | |
885 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
886 | } | |
887 | ||
888 | enum { | |
889 | ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */ | |
890 | ISCSI_TCP_SKB_DONE, /* skb is out of data */ | |
891 | ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */ | |
892 | ISCSI_TCP_SUSPENDED, /* conn is suspended */ | |
893 | }; | |
894 | ||
7ba24713 | 895 | /** |
63c62f1c MC |
896 | * iscsi_tcp_recv_skb - Process skb |
897 | * @conn: iscsi connection | |
898 | * @skb: network buffer with header and/or data segment | |
7ba24713 | 899 | * @offset: offset in skb |
63c62f1c MC |
900 | * @offload: bool indicating if transfer was offloaded |
901 | */ | |
902 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
903 | unsigned int offset, bool offloaded, int *status) | |
7ba24713 | 904 | { |
5bb0b55a | 905 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
a8ac6311 | 906 | struct iscsi_segment *segment = &tcp_conn->in.segment; |
da32dd68 OK |
907 | struct skb_seq_state seq; |
908 | unsigned int consumed = 0; | |
909 | int rc = 0; | |
7ba24713 | 910 | |
da32dd68 | 911 | debug_tcp("in %d bytes\n", skb->len - offset); |
7ba24713 AA |
912 | |
913 | if (unlikely(conn->suspend_rx)) { | |
914 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
63c62f1c | 915 | *status = ISCSI_TCP_SUSPENDED; |
7ba24713 AA |
916 | return 0; |
917 | } | |
918 | ||
63c62f1c MC |
919 | if (offloaded) { |
920 | segment->total_copied = segment->total_size; | |
921 | goto segment_done; | |
922 | } | |
923 | ||
da32dd68 OK |
924 | skb_prepare_seq_read(skb, offset, skb->len, &seq); |
925 | while (1) { | |
926 | unsigned int avail; | |
927 | const u8 *ptr; | |
7ba24713 | 928 | |
da32dd68 | 929 | avail = skb_seq_read(consumed, &ptr, &seq); |
a8ac6311 OK |
930 | if (avail == 0) { |
931 | debug_tcp("no more data avail. Consumed %d\n", | |
932 | consumed); | |
63c62f1c MC |
933 | *status = ISCSI_TCP_SKB_DONE; |
934 | skb_abort_seq_read(&seq); | |
935 | goto skb_done; | |
a8ac6311 OK |
936 | } |
937 | BUG_ON(segment->copied >= segment->size); | |
da32dd68 OK |
938 | |
939 | debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail); | |
a8ac6311 | 940 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
da32dd68 OK |
941 | BUG_ON(rc == 0); |
942 | consumed += rc; | |
943 | ||
a8ac6311 | 944 | if (segment->total_copied >= segment->total_size) { |
63c62f1c MC |
945 | skb_abort_seq_read(&seq); |
946 | goto segment_done; | |
7ba24713 | 947 | } |
7ba24713 | 948 | } |
63c62f1c MC |
949 | |
950 | segment_done: | |
951 | *status = ISCSI_TCP_SEGMENT_DONE; | |
952 | debug_tcp("segment done\n"); | |
953 | rc = segment->done(tcp_conn, segment); | |
954 | if (rc != 0) { | |
955 | *status = ISCSI_TCP_CONN_ERR; | |
956 | debug_tcp("Error receiving PDU, errno=%d\n", rc); | |
957 | iscsi_conn_failure(conn, rc); | |
958 | return 0; | |
959 | } | |
960 | /* The done() functions sets up the next segment. */ | |
961 | ||
962 | skb_done: | |
da32dd68 OK |
963 | conn->rxdata_octets += consumed; |
964 | return consumed; | |
63c62f1c MC |
965 | } |
966 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
7ba24713 | 967 | |
63c62f1c MC |
968 | /** |
969 | * iscsi_tcp_recv - TCP receive in sendfile fashion | |
970 | * @rd_desc: read descriptor | |
971 | * @skb: socket buffer | |
972 | * @offset: offset in skb | |
973 | * @len: skb->len - offset | |
974 | **/ | |
975 | static int | |
976 | iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
977 | unsigned int offset, size_t len) | |
978 | { | |
979 | struct iscsi_conn *conn = rd_desc->arg.data; | |
980 | unsigned int consumed, total_consumed = 0; | |
981 | int status; | |
982 | ||
983 | debug_tcp("in %d bytes\n", skb->len - offset); | |
984 | ||
985 | do { | |
986 | status = 0; | |
987 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
988 | offset += consumed; | |
989 | total_consumed += consumed; | |
990 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
991 | ||
992 | debug_tcp("read %d bytes status %d\n", skb->len - offset, status); | |
993 | return total_consumed; | |
7ba24713 AA |
994 | } |
995 | ||
996 | static void | |
997 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
998 | { | |
999 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 1000 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
1001 | read_descriptor_t rd_desc; |
1002 | ||
1003 | read_lock(&sk->sk_callback_lock); | |
1004 | ||
665b44ae | 1005 | /* |
da32dd68 | 1006 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 1007 | * We set count to 1 because we want the network layer to |
da32dd68 | 1008 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
1009 | * handled pdus that cross buffers or pdus that still need data. |
1010 | */ | |
7ba24713 | 1011 | rd_desc.arg.data = conn; |
665b44ae | 1012 | rd_desc.count = 1; |
da32dd68 | 1013 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv); |
7ba24713 AA |
1014 | |
1015 | read_unlock(&sk->sk_callback_lock); | |
da32dd68 OK |
1016 | |
1017 | /* If we had to (atomically) map a highmem page, | |
1018 | * unmap it now. */ | |
a8ac6311 | 1019 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7ba24713 AA |
1020 | } |
1021 | ||
1022 | static void | |
1023 | iscsi_tcp_state_change(struct sock *sk) | |
1024 | { | |
5bb0b55a | 1025 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1026 | struct iscsi_conn *conn; |
1027 | struct iscsi_session *session; | |
1028 | void (*old_state_change)(struct sock *); | |
1029 | ||
1030 | read_lock(&sk->sk_callback_lock); | |
1031 | ||
1032 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1033 | session = conn->session; | |
1034 | ||
e6273993 MC |
1035 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1036 | sk->sk_state == TCP_CLOSE) && | |
1037 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1038 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1039 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1040 | } | |
1041 | ||
5bb0b55a MC |
1042 | tcp_conn = conn->dd_data; |
1043 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1044 | |
1045 | read_unlock(&sk->sk_callback_lock); | |
1046 | ||
1047 | old_state_change(sk); | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * iscsi_write_space - Called when more output buffer space is available | |
1052 | * @sk: socket space is available for | |
1053 | **/ | |
30b49150 | 1054 | static void iscsi_tcp_write_space(struct sock *sk) |
7ba24713 AA |
1055 | { |
1056 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1057 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1058 | ||
1059 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1060 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1061 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1062 | } |
1063 | ||
30b49150 | 1064 | static void iscsi_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 1065 | { |
5bb0b55a MC |
1066 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1067 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1068 | |
1069 | /* assign new callbacks */ | |
1070 | write_lock_bh(&sk->sk_callback_lock); | |
1071 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1072 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1073 | tcp_conn->old_state_change = sk->sk_state_change; | |
1074 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1075 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1076 | sk->sk_state_change = iscsi_tcp_state_change; | |
30b49150 | 1077 | sk->sk_write_space = iscsi_tcp_write_space; |
7ba24713 AA |
1078 | write_unlock_bh(&sk->sk_callback_lock); |
1079 | } | |
1080 | ||
30b49150 | 1081 | static void iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1082 | { |
5bb0b55a | 1083 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1084 | |
1085 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1086 | write_lock_bh(&sk->sk_callback_lock); | |
1087 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1088 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1089 | sk->sk_state_change = tcp_conn->old_state_change; | |
1090 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1091 | sk->sk_no_check = 0; |
1092 | write_unlock_bh(&sk->sk_callback_lock); | |
1093 | } | |
1094 | ||
1095 | /** | |
30b49150 | 1096 | * iscsi_tcp_xmit - TCP transmit |
a8ac6311 | 1097 | **/ |
30b49150 | 1098 | static int iscsi_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 1099 | { |
5bb0b55a | 1100 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
a8ac6311 OK |
1101 | struct iscsi_segment *segment = &tcp_conn->out.segment; |
1102 | unsigned int consumed = 0; | |
1103 | int rc = 0; | |
7ba24713 | 1104 | |
a8ac6311 OK |
1105 | while (1) { |
1106 | rc = iscsi_tcp_xmit_segment(tcp_conn, segment); | |
6f481e3c MC |
1107 | if (rc < 0) { |
1108 | rc = ISCSI_ERR_XMIT_FAILED; | |
a8ac6311 | 1109 | goto error; |
6f481e3c | 1110 | } |
a8ac6311 OK |
1111 | if (rc == 0) |
1112 | break; | |
1113 | ||
1114 | consumed += rc; | |
1115 | ||
1116 | if (segment->total_copied >= segment->total_size) { | |
1117 | if (segment->done != NULL) { | |
1118 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 1119 | if (rc != 0) |
a8ac6311 OK |
1120 | goto error; |
1121 | } | |
1122 | } | |
3219e529 MC |
1123 | } |
1124 | ||
a8ac6311 OK |
1125 | debug_tcp("xmit %d bytes\n", consumed); |
1126 | ||
1127 | conn->txdata_octets += consumed; | |
1128 | return consumed; | |
1129 | ||
1130 | error: | |
1131 | /* Transmit error. We could initiate error recovery | |
1132 | * here. */ | |
1133 | debug_tcp("Error sending PDU, errno=%d\n", rc); | |
6f481e3c MC |
1134 | iscsi_conn_failure(conn, rc); |
1135 | return -EIO; | |
7ba24713 AA |
1136 | } |
1137 | ||
1138 | /** | |
a8ac6311 OK |
1139 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
1140 | */ | |
7ba24713 | 1141 | static inline int |
a8ac6311 | 1142 | iscsi_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 1143 | { |
a8ac6311 OK |
1144 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1145 | struct iscsi_segment *segment = &tcp_conn->out.segment; | |
7ba24713 | 1146 | |
a8ac6311 | 1147 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
1148 | } |
1149 | ||
e5a7efef | 1150 | static int iscsi_tcp_flush(struct iscsi_task *task) |
7ba24713 | 1151 | { |
e5a7efef | 1152 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
1153 | int rc; |
1154 | ||
1155 | while (iscsi_tcp_xmit_qlen(conn)) { | |
30b49150 | 1156 | rc = iscsi_tcp_xmit(conn); |
a8ac6311 | 1157 | if (rc == 0) |
7ba24713 | 1158 | return -EAGAIN; |
a8ac6311 OK |
1159 | if (rc < 0) |
1160 | return rc; | |
3219e529 | 1161 | } |
7ba24713 | 1162 | |
a8ac6311 | 1163 | return 0; |
7ba24713 AA |
1164 | } |
1165 | ||
a8ac6311 OK |
1166 | /* |
1167 | * This is called when we're done sending the header. | |
1168 | * Simply copy the data_segment to the send segment, and return. | |
1169 | */ | |
1170 | static int | |
1171 | iscsi_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, | |
1172 | struct iscsi_segment *segment) | |
7ba24713 | 1173 | { |
a8ac6311 OK |
1174 | tcp_conn->out.segment = tcp_conn->out.data_segment; |
1175 | debug_tcp("Header done. Next segment size %u total_size %u\n", | |
1176 | tcp_conn->out.segment.size, tcp_conn->out.segment.total_size); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static void | |
1181 | iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen) | |
1182 | { | |
1183 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1184 | ||
3a12b199 | 1185 | debug_tcp("%s(%p%s)\n", __func__, tcp_conn, |
a8ac6311 OK |
1186 | conn->hdrdgst_en? ", digest enabled" : ""); |
1187 | ||
1188 | /* Clear the data segment - needs to be filled in by the | |
1189 | * caller using iscsi_tcp_send_data_prep() */ | |
1190 | memset(&tcp_conn->out.data_segment, 0, sizeof(struct iscsi_segment)); | |
1191 | ||
1192 | /* If header digest is enabled, compute the CRC and | |
1193 | * place the digest into the same buffer. We make | |
135a8ad4 | 1194 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
1195 | * sufficient room. |
1196 | */ | |
1197 | if (conn->hdrdgst_en) { | |
1198 | iscsi_tcp_dgst_header(&tcp_conn->tx_hash, hdr, hdrlen, | |
1199 | hdr + hdrlen); | |
1200 | hdrlen += ISCSI_DIGEST_SIZE; | |
1201 | } | |
1202 | ||
1203 | /* Remember header pointer for later, when we need | |
1204 | * to decide whether there's a payload to go along | |
1205 | * with the header. */ | |
1206 | tcp_conn->out.hdr = hdr; | |
1207 | ||
1208 | iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen, | |
1209 | iscsi_tcp_send_hdr_done, NULL); | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Prepare the send buffer for the payload data. | |
1214 | * Padding and checksumming will all be taken care | |
1215 | * of by the iscsi_segment routines. | |
1216 | */ | |
1217 | static int | |
1218 | iscsi_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, | |
1219 | unsigned int count, unsigned int offset, | |
1220 | unsigned int len) | |
1221 | { | |
1222 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1223 | struct hash_desc *tx_hash = NULL; | |
1224 | unsigned int hdr_spec_len; | |
1225 | ||
3a12b199 | 1226 | debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __func__, |
a8ac6311 OK |
1227 | tcp_conn, offset, len, |
1228 | conn->datadgst_en? ", digest enabled" : ""); | |
1229 | ||
1230 | /* Make sure the datalen matches what the caller | |
1231 | said he would send. */ | |
1232 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1233 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1234 | ||
1235 | if (conn->datadgst_en) | |
1236 | tx_hash = &tcp_conn->tx_hash; | |
1237 | ||
1238 | return iscsi_segment_seek_sg(&tcp_conn->out.data_segment, | |
1239 | sg, count, offset, len, | |
1240 | NULL, tx_hash); | |
1241 | } | |
1242 | ||
1243 | static void | |
1244 | iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data, | |
1245 | size_t len) | |
1246 | { | |
1247 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1248 | struct hash_desc *tx_hash = NULL; | |
1249 | unsigned int hdr_spec_len; | |
1250 | ||
3a12b199 | 1251 | debug_tcp("%s(%p, datalen=%d%s)\n", __func__, tcp_conn, len, |
a8ac6311 OK |
1252 | conn->datadgst_en? ", digest enabled" : ""); |
1253 | ||
1254 | /* Make sure the datalen matches what the caller | |
1255 | said he would send. */ | |
1256 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1257 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1258 | ||
1259 | if (conn->datadgst_en) | |
1260 | tx_hash = &tcp_conn->tx_hash; | |
1261 | ||
1262 | iscsi_segment_init_linear(&tcp_conn->out.data_segment, | |
1263 | data, len, NULL, tx_hash); | |
7ba24713 AA |
1264 | } |
1265 | ||
e5a7efef MC |
1266 | static int iscsi_tcp_pdu_init(struct iscsi_task *task, |
1267 | unsigned int offset, unsigned int count) | |
1268 | { | |
1269 | struct iscsi_conn *conn = task->conn; | |
1270 | int err = 0; | |
1271 | ||
1272 | iscsi_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); | |
1273 | ||
1274 | if (!count) | |
1275 | return 0; | |
1276 | ||
1277 | if (!task->sc) | |
1278 | iscsi_tcp_send_linear_data_prepare(conn, task->data, count); | |
1279 | else { | |
1280 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
1281 | ||
1282 | err = iscsi_tcp_send_data_prep(conn, sdb->table.sgl, | |
1283 | sdb->table.nents, offset, count); | |
1284 | } | |
1285 | ||
1286 | if (err) { | |
1287 | iscsi_conn_failure(conn, err); | |
1288 | return -EIO; | |
1289 | } | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static int iscsi_tcp_pdu_alloc(struct iscsi_task *task) | |
1294 | { | |
1295 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1296 | ||
1297 | task->hdr = &tcp_task->hdr.hdrbuf; | |
1298 | task->hdr_max = sizeof(tcp_task->hdr) - ISCSI_DIGEST_SIZE; | |
1299 | return 0; | |
1300 | } | |
1301 | ||
7ba24713 | 1302 | /** |
fbc514b4 | 1303 | * iscsi_tcp_task - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 | 1304 | * @conn: iscsi connection |
135a8ad4 | 1305 | * @task: scsi command task |
7ba24713 AA |
1306 | * @sc: scsi command |
1307 | **/ | |
e5a7efef | 1308 | static int iscsi_tcp_task_init(struct iscsi_task *task) |
7ba24713 | 1309 | { |
135a8ad4 MC |
1310 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
1311 | struct iscsi_conn *conn = task->conn; | |
1312 | struct scsi_cmnd *sc = task->sc; | |
a8ac6311 | 1313 | int err; |
7ba24713 | 1314 | |
fbc514b4 MC |
1315 | if (!sc) { |
1316 | /* | |
135a8ad4 | 1317 | * mgmt tasks do not have a scatterlist since they come |
fbc514b4 MC |
1318 | * in from the iscsi interface. |
1319 | */ | |
135a8ad4 MC |
1320 | debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, |
1321 | task->itt); | |
fbc514b4 | 1322 | |
e5a7efef | 1323 | return conn->session->tt->init_pdu(task, 0, task->data_count); |
fbc514b4 MC |
1324 | } |
1325 | ||
135a8ad4 | 1326 | BUG_ON(__kfifo_len(tcp_task->r2tqueue)); |
135a8ad4 | 1327 | tcp_task->exp_datasn = 0; |
a8ac6311 OK |
1328 | |
1329 | /* Prepare PDU, optionally w/ immediate data */ | |
135a8ad4 MC |
1330 | debug_scsi("task deq [cid %d itt 0x%x imm %d unsol %d]\n", |
1331 | conn->id, task->itt, task->imm_count, | |
e5a7efef | 1332 | task->unsol_r2t.data_length); |
a8ac6311 | 1333 | |
e5a7efef | 1334 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); |
a8ac6311 OK |
1335 | if (err) |
1336 | return err; | |
135a8ad4 | 1337 | task->imm_count = 0; |
a8ac6311 | 1338 | return 0; |
7ba24713 AA |
1339 | } |
1340 | ||
e5a7efef MC |
1341 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) |
1342 | { | |
1343 | struct iscsi_session *session = task->conn->session; | |
1344 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1345 | struct iscsi_r2t_info *r2t = NULL; | |
1346 | ||
1347 | if (iscsi_task_has_unsol_data(task)) | |
1348 | r2t = &task->unsol_r2t; | |
1349 | else { | |
1350 | spin_lock_bh(&session->lock); | |
1351 | if (tcp_task->r2t) { | |
1352 | r2t = tcp_task->r2t; | |
1353 | /* Continue with this R2T? */ | |
1354 | if (r2t->data_length <= r2t->sent) { | |
1355 | debug_scsi(" done with r2t %p\n", r2t); | |
1356 | __kfifo_put(tcp_task->r2tpool.queue, | |
1357 | (void *)&tcp_task->r2t, | |
1358 | sizeof(void *)); | |
1359 | tcp_task->r2t = r2t = NULL; | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | if (r2t == NULL) { | |
1364 | __kfifo_get(tcp_task->r2tqueue, | |
1365 | (void *)&tcp_task->r2t, sizeof(void *)); | |
1366 | r2t = tcp_task->r2t; | |
1367 | } | |
1368 | spin_unlock_bh(&session->lock); | |
1369 | } | |
1370 | ||
1371 | return r2t; | |
1372 | } | |
1373 | ||
a8ac6311 | 1374 | /* |
135a8ad4 MC |
1375 | * iscsi_tcp_task_xmit - xmit normal PDU task |
1376 | * @task: iscsi command task | |
a8ac6311 OK |
1377 | * |
1378 | * We're expected to return 0 when everything was transmitted succesfully, | |
1379 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind | |
1380 | * of error. | |
1381 | */ | |
e5a7efef | 1382 | static int iscsi_tcp_task_xmit(struct iscsi_task *task) |
7ba24713 | 1383 | { |
135a8ad4 | 1384 | struct iscsi_conn *conn = task->conn; |
e5a7efef MC |
1385 | struct iscsi_session *session = conn->session; |
1386 | struct iscsi_r2t_info *r2t; | |
218432c6 | 1387 | int rc = 0; |
3219e529 | 1388 | |
a8ac6311 OK |
1389 | flush: |
1390 | /* Flush any pending data first. */ | |
e5a7efef | 1391 | rc = session->tt->xmit_pdu(task); |
a8ac6311 | 1392 | if (rc < 0) |
62f38300 MC |
1393 | return rc; |
1394 | ||
fbc514b4 | 1395 | /* mgmt command */ |
e5a7efef | 1396 | if (!task->sc) { |
135a8ad4 MC |
1397 | if (task->hdr->itt == RESERVED_ITT) |
1398 | iscsi_put_task(task); | |
fbc514b4 MC |
1399 | return 0; |
1400 | } | |
1401 | ||
a8ac6311 | 1402 | /* Are we done already? */ |
e5a7efef | 1403 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) |
a8ac6311 | 1404 | return 0; |
7ba24713 | 1405 | |
e5a7efef MC |
1406 | r2t = iscsi_tcp_get_curr_r2t(task); |
1407 | if (r2t == NULL) { | |
a8ac6311 | 1408 | /* Waiting for more R2Ts to arrive. */ |
e5a7efef MC |
1409 | debug_tcp("no R2Ts yet\n"); |
1410 | return 0; | |
1411 | } | |
7ba24713 | 1412 | |
e5a7efef MC |
1413 | rc = conn->session->tt->alloc_pdu(task); |
1414 | if (rc) | |
1415 | return rc; | |
1416 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
7ba24713 | 1417 | |
e5a7efef MC |
1418 | debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1419 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1420 | r2t->data_offset + r2t->sent, r2t->data_count); | |
7ba24713 | 1421 | |
e5a7efef MC |
1422 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, |
1423 | r2t->data_count); | |
1424 | if (rc) | |
1425 | return rc; | |
1426 | r2t->sent += r2t->data_count; | |
1427 | goto flush; | |
7ba24713 AA |
1428 | } |
1429 | ||
5bb0b55a MC |
1430 | static struct iscsi_cls_conn * |
1431 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1432 | { |
5bb0b55a MC |
1433 | struct iscsi_conn *conn; |
1434 | struct iscsi_cls_conn *cls_conn; | |
1435 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1436 | |
5d91e209 | 1437 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx); |
5bb0b55a MC |
1438 | if (!cls_conn) |
1439 | return NULL; | |
1440 | conn = cls_conn->dd_data; | |
7ba24713 | 1441 | /* |
5bb0b55a MC |
1442 | * due to strange issues with iser these are not set |
1443 | * in iscsi_conn_setup | |
7ba24713 | 1444 | */ |
bf32ed33 | 1445 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1446 | |
5d91e209 | 1447 | tcp_conn = conn->dd_data; |
5bb0b55a | 1448 | tcp_conn->iscsi_conn = conn; |
7ba24713 | 1449 | |
c9802cd9 JB |
1450 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1451 | CRYPTO_ALG_ASYNC); | |
1452 | tcp_conn->tx_hash.flags = 0; | |
322d739d | 1453 | if (IS_ERR(tcp_conn->tx_hash.tfm)) |
5d91e209 | 1454 | goto free_conn; |
dd8c0d95 | 1455 | |
c9802cd9 JB |
1456 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1457 | CRYPTO_ALG_ASYNC); | |
1458 | tcp_conn->rx_hash.flags = 0; | |
322d739d | 1459 | if (IS_ERR(tcp_conn->rx_hash.tfm)) |
dd8c0d95 MC |
1460 | goto free_tx_tfm; |
1461 | ||
5bb0b55a | 1462 | return cls_conn; |
7ba24713 | 1463 | |
dd8c0d95 | 1464 | free_tx_tfm: |
c9802cd9 | 1465 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
5d91e209 | 1466 | free_conn: |
322d739d MC |
1467 | iscsi_conn_printk(KERN_ERR, conn, |
1468 | "Could not create connection due to crc32c " | |
1469 | "loading error. Make sure the crc32c " | |
1470 | "module is built as a module or into the " | |
1471 | "kernel\n"); | |
5bb0b55a MC |
1472 | iscsi_conn_teardown(cls_conn); |
1473 | return NULL; | |
7ba24713 AA |
1474 | } |
1475 | ||
1c83469d MC |
1476 | static void |
1477 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1478 | { | |
22236961 | 1479 | struct iscsi_session *session = conn->session; |
1c83469d | 1480 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
22236961 | 1481 | struct socket *sock = tcp_conn->sock; |
1c83469d | 1482 | |
22236961 | 1483 | if (!sock) |
1c83469d MC |
1484 | return; |
1485 | ||
22236961 | 1486 | sock_hold(sock->sk); |
1c83469d | 1487 | iscsi_conn_restore_callbacks(tcp_conn); |
22236961 | 1488 | sock_put(sock->sk); |
1c83469d | 1489 | |
22236961 | 1490 | spin_lock_bh(&session->lock); |
1c83469d | 1491 | tcp_conn->sock = NULL; |
22236961 MC |
1492 | spin_unlock_bh(&session->lock); |
1493 | sockfd_put(sock); | |
1c83469d MC |
1494 | } |
1495 | ||
7ba24713 | 1496 | static void |
5bb0b55a | 1497 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1498 | { |
5bb0b55a MC |
1499 | struct iscsi_conn *conn = cls_conn->dd_data; |
1500 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1501 | |
1c83469d | 1502 | iscsi_tcp_release_conn(conn); |
7ba24713 | 1503 | |
534284a0 PW |
1504 | if (tcp_conn->tx_hash.tfm) |
1505 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1506 | if (tcp_conn->rx_hash.tfm) | |
1507 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1508 | |
5d91e209 | 1509 | iscsi_conn_teardown(cls_conn); |
5bb0b55a | 1510 | } |
7ba24713 | 1511 | |
1c83469d MC |
1512 | static void |
1513 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1514 | { | |
1515 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 MC |
1516 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1517 | ||
1518 | /* userspace may have goofed up and not bound us */ | |
1519 | if (!tcp_conn->sock) | |
1520 | return; | |
1521 | /* | |
1522 | * Make sure our recv side is stopped. | |
1523 | * Older tools called conn stop before ep_disconnect | |
1524 | * so IO could still be coming in. | |
1525 | */ | |
1526 | write_lock_bh(&tcp_conn->sock->sk->sk_callback_lock); | |
1527 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1528 | write_unlock_bh(&tcp_conn->sock->sk->sk_callback_lock); | |
1c83469d MC |
1529 | |
1530 | iscsi_conn_stop(cls_conn, flag); | |
1531 | iscsi_tcp_release_conn(conn); | |
1532 | } | |
1533 | ||
22236961 MC |
1534 | static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
1535 | char *buf, int *port, | |
1536 | int (*getname)(struct socket *, struct sockaddr *, | |
1537 | int *addrlen)) | |
1538 | { | |
1539 | struct sockaddr_storage *addr; | |
1540 | struct sockaddr_in6 *sin6; | |
1541 | struct sockaddr_in *sin; | |
1542 | int rc = 0, len; | |
1543 | ||
a9204879 | 1544 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
1545 | if (!addr) |
1546 | return -ENOMEM; | |
1547 | ||
1548 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
1549 | rc = -ENODEV; | |
1550 | goto free_addr; | |
1551 | } | |
1552 | ||
1553 | switch (addr->ss_family) { | |
1554 | case AF_INET: | |
1555 | sin = (struct sockaddr_in *)addr; | |
1556 | spin_lock_bh(&conn->session->lock); | |
63779436 | 1557 | sprintf(buf, "%pI4", &sin->sin_addr.s_addr); |
22236961 MC |
1558 | *port = be16_to_cpu(sin->sin_port); |
1559 | spin_unlock_bh(&conn->session->lock); | |
1560 | break; | |
1561 | case AF_INET6: | |
1562 | sin6 = (struct sockaddr_in6 *)addr; | |
1563 | spin_lock_bh(&conn->session->lock); | |
5b095d98 | 1564 | sprintf(buf, "%pI6", &sin6->sin6_addr); |
22236961 MC |
1565 | *port = be16_to_cpu(sin6->sin6_port); |
1566 | spin_unlock_bh(&conn->session->lock); | |
1567 | break; | |
1568 | } | |
1569 | free_addr: | |
1570 | kfree(addr); | |
1571 | return rc; | |
1572 | } | |
1573 | ||
5bb0b55a MC |
1574 | static int |
1575 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1576 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1577 | int is_leading) |
1578 | { | |
75613521 MC |
1579 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
1580 | struct iscsi_host *ihost = shost_priv(shost); | |
5bb0b55a MC |
1581 | struct iscsi_conn *conn = cls_conn->dd_data; |
1582 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1583 | struct sock *sk; | |
1584 | struct socket *sock; | |
1585 | int err; | |
7ba24713 | 1586 | |
5bb0b55a | 1587 | /* lookup for existing socket */ |
264faaaa | 1588 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 1589 | if (!sock) { |
322d739d MC |
1590 | iscsi_conn_printk(KERN_ERR, conn, |
1591 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 1592 | return -EEXIST; |
7ba24713 | 1593 | } |
22236961 MC |
1594 | /* |
1595 | * copy these values now because if we drop the session | |
1596 | * userspace may still want to query the values since we will | |
1597 | * be using them for the reconnect | |
1598 | */ | |
1599 | err = iscsi_tcp_get_addr(conn, sock, conn->portal_address, | |
1600 | &conn->portal_port, kernel_getpeername); | |
1601 | if (err) | |
1602 | goto free_socket; | |
1603 | ||
75613521 MC |
1604 | err = iscsi_tcp_get_addr(conn, sock, ihost->local_address, |
1605 | &ihost->local_port, kernel_getsockname); | |
22236961 MC |
1606 | if (err) |
1607 | goto free_socket; | |
7ba24713 | 1608 | |
5bb0b55a MC |
1609 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1610 | if (err) | |
22236961 | 1611 | goto free_socket; |
7ba24713 | 1612 | |
67a61114 MC |
1613 | /* bind iSCSI connection and socket */ |
1614 | tcp_conn->sock = sock; | |
7ba24713 | 1615 | |
67a61114 MC |
1616 | /* setup Socket parameters */ |
1617 | sk = sock->sk; | |
1618 | sk->sk_reuse = 1; | |
1619 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1620 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1621 | |
30b49150 | 1622 | iscsi_tcp_conn_set_callbacks(conn); |
67a61114 MC |
1623 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; |
1624 | /* | |
1625 | * set receive state machine into initial state | |
1626 | */ | |
da32dd68 | 1627 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 1628 | return 0; |
22236961 MC |
1629 | |
1630 | free_socket: | |
1631 | sockfd_put(sock); | |
1632 | return err; | |
7ba24713 AA |
1633 | } |
1634 | ||
7ba24713 AA |
1635 | static int |
1636 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1637 | { | |
1638 | int i; | |
1639 | int cmd_i; | |
1640 | ||
1641 | /* | |
135a8ad4 | 1642 | * initialize per-task: R2T pool and xmit queue |
7ba24713 AA |
1643 | */ |
1644 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
135a8ad4 MC |
1645 | struct iscsi_task *task = session->cmds[cmd_i]; |
1646 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
7ba24713 AA |
1647 | |
1648 | /* | |
e5a7efef | 1649 | * pre-allocated x2 as much r2ts to handle race when |
7ba24713 AA |
1650 | * target acks DataOut faster than we data_xmit() queues |
1651 | * could replenish r2tqueue. | |
1652 | */ | |
1653 | ||
1654 | /* R2T pool */ | |
e5a7efef MC |
1655 | if (iscsi_pool_init(&tcp_task->r2tpool, |
1656 | session->max_r2t * 2, NULL, | |
5bb0b55a | 1657 | sizeof(struct iscsi_r2t_info))) { |
7ba24713 AA |
1658 | goto r2t_alloc_fail; |
1659 | } | |
1660 | ||
1661 | /* R2T xmit queue */ | |
135a8ad4 | 1662 | tcp_task->r2tqueue = kfifo_alloc( |
7ba24713 | 1663 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
135a8ad4 MC |
1664 | if (tcp_task->r2tqueue == ERR_PTR(-ENOMEM)) { |
1665 | iscsi_pool_free(&tcp_task->r2tpool); | |
7ba24713 AA |
1666 | goto r2t_alloc_fail; |
1667 | } | |
7ba24713 AA |
1668 | } |
1669 | ||
1670 | return 0; | |
1671 | ||
1672 | r2t_alloc_fail: | |
1673 | for (i = 0; i < cmd_i; i++) { | |
135a8ad4 MC |
1674 | struct iscsi_task *task = session->cmds[i]; |
1675 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
5bb0b55a | 1676 | |
135a8ad4 MC |
1677 | kfifo_free(tcp_task->r2tqueue); |
1678 | iscsi_pool_free(&tcp_task->r2tpool); | |
7ba24713 AA |
1679 | } |
1680 | return -ENOMEM; | |
1681 | } | |
1682 | ||
1683 | static void | |
1684 | iscsi_r2tpool_free(struct iscsi_session *session) | |
1685 | { | |
1686 | int i; | |
1687 | ||
1688 | for (i = 0; i < session->cmds_max; i++) { | |
135a8ad4 MC |
1689 | struct iscsi_task *task = session->cmds[i]; |
1690 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
7ba24713 | 1691 | |
135a8ad4 MC |
1692 | kfifo_free(tcp_task->r2tqueue); |
1693 | iscsi_pool_free(&tcp_task->r2tpool); | |
7ba24713 | 1694 | } |
7ba24713 AA |
1695 | } |
1696 | ||
1697 | static int | |
7b7232f3 | 1698 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 1699 | char *buf, int buflen) |
7ba24713 | 1700 | { |
7b7232f3 | 1701 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 1702 | struct iscsi_session *session = conn->session; |
5bb0b55a | 1703 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 1704 | int value; |
7ba24713 | 1705 | |
7ba24713 | 1706 | switch(param) { |
7ba24713 | 1707 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 1708 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1709 | break; |
1710 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 1711 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
1712 | tcp_conn->sendpage = conn->datadgst_en ? |
1713 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 1714 | break; |
7ba24713 | 1715 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 1716 | sscanf(buf, "%d", &value); |
df93ffcd MC |
1717 | if (value <= 0 || !is_power_of_2(value)) |
1718 | return -EINVAL; | |
1719 | if (session->max_r2t == value) | |
7ba24713 AA |
1720 | break; |
1721 | iscsi_r2tpool_free(session); | |
5c75b7fc | 1722 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1723 | if (iscsi_r2tpool_alloc(session)) |
1724 | return -ENOMEM; | |
1725 | break; | |
7ba24713 | 1726 | default: |
5c75b7fc | 1727 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1728 | } |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | static int | |
5c75b7fc MC |
1734 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
1735 | enum iscsi_param param, char *buf) | |
7b8631b5 | 1736 | { |
7b7232f3 | 1737 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 1738 | int len; |
7b8631b5 MC |
1739 | |
1740 | switch(param) { | |
fd7255f5 | 1741 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
1742 | spin_lock_bh(&conn->session->lock); |
1743 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
1744 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 1745 | break; |
fd7255f5 | 1746 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
1747 | spin_lock_bh(&conn->session->lock); |
1748 | len = sprintf(buf, "%s\n", conn->portal_address); | |
1749 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
1750 | break; |
1751 | default: | |
5c75b7fc | 1752 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
1753 | } |
1754 | ||
1755 | return len; | |
1756 | } | |
1757 | ||
7ba24713 | 1758 | static void |
7b7232f3 | 1759 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 1760 | { |
7b7232f3 | 1761 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 1762 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
1763 | |
1764 | stats->txdata_octets = conn->txdata_octets; | |
1765 | stats->rxdata_octets = conn->rxdata_octets; | |
1766 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1767 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1768 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1769 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1770 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1771 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1772 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1773 | stats->custom_length = 3; | |
1774 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 1775 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 1776 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 1777 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
1778 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
1779 | stats->custom[2].value = conn->eh_abort_cnt; | |
1780 | } | |
1781 | ||
5bb0b55a | 1782 | static struct iscsi_cls_session * |
06520ede | 1783 | iscsi_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
40753caa MC |
1784 | uint16_t qdepth, uint32_t initial_cmdsn, |
1785 | uint32_t *hostno) | |
7ba24713 | 1786 | { |
5bb0b55a MC |
1787 | struct iscsi_cls_session *cls_session; |
1788 | struct iscsi_session *session; | |
06520ede | 1789 | struct Scsi_Host *shost; |
7ba24713 | 1790 | |
06520ede MC |
1791 | if (ep) { |
1792 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
1793 | return NULL; |
1794 | } | |
1795 | ||
a4804cd6 | 1796 | shost = iscsi_host_alloc(&iscsi_sht, 0, qdepth); |
75613521 | 1797 | if (!shost) |
5bb0b55a | 1798 | return NULL; |
75613521 MC |
1799 | shost->transportt = iscsi_tcp_scsi_transport; |
1800 | shost->max_lun = iscsi_max_lun; | |
1801 | shost->max_id = 0; | |
1802 | shost->max_channel = 0; | |
30e9ba9f | 1803 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 1804 | |
a4804cd6 | 1805 | if (iscsi_host_add(shost, NULL)) |
75613521 MC |
1806 | goto free_host; |
1807 | *hostno = shost->host_no; | |
1808 | ||
1809 | cls_session = iscsi_session_setup(&iscsi_tcp_transport, shost, cmds_max, | |
135a8ad4 | 1810 | sizeof(struct iscsi_tcp_task), |
7970634b | 1811 | initial_cmdsn, 0); |
75613521 MC |
1812 | if (!cls_session) |
1813 | goto remove_host; | |
1814 | session = cls_session->dd_data; | |
7ba24713 | 1815 | |
fbc514b4 | 1816 | shost->can_queue = session->scsi_cmds_max; |
75613521 MC |
1817 | if (iscsi_r2tpool_alloc(session)) |
1818 | goto remove_session; | |
5bb0b55a MC |
1819 | return cls_session; |
1820 | ||
75613521 | 1821 | remove_session: |
5bb0b55a | 1822 | iscsi_session_teardown(cls_session); |
75613521 | 1823 | remove_host: |
a4804cd6 | 1824 | iscsi_host_remove(shost); |
75613521 | 1825 | free_host: |
a4804cd6 | 1826 | iscsi_host_free(shost); |
5bb0b55a MC |
1827 | return NULL; |
1828 | } | |
1829 | ||
1830 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
1831 | { | |
75613521 MC |
1832 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
1833 | ||
1834 | iscsi_r2tpool_free(cls_session->dd_data); | |
e5bd7b54 | 1835 | iscsi_session_teardown(cls_session); |
75613521 | 1836 | |
a4804cd6 MC |
1837 | iscsi_host_remove(shost); |
1838 | iscsi_host_free(shost); | |
7ba24713 AA |
1839 | } |
1840 | ||
d1d81c01 MC |
1841 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) |
1842 | { | |
b6d44fe9 | 1843 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
1844 | blk_queue_dma_alignment(sdev->request_queue, 0); |
1845 | return 0; | |
1846 | } | |
1847 | ||
5bb0b55a | 1848 | static struct scsi_host_template iscsi_sht = { |
7974392c | 1849 | .module = THIS_MODULE, |
f4246b33 | 1850 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
1851 | .queuecommand = iscsi_queuecommand, |
1852 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 1853 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 1854 | .sg_tablesize = 4096, |
8231f0ed | 1855 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
1856 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
1857 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 1858 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 1859 | .eh_target_reset_handler= iscsi_eh_target_reset, |
5bb0b55a | 1860 | .use_clustering = DISABLE_CLUSTERING, |
d1d81c01 | 1861 | .slave_configure = iscsi_tcp_slave_configure, |
5bb0b55a MC |
1862 | .proc_name = "iscsi_tcp", |
1863 | .this_id = -1, | |
1864 | }; | |
1865 | ||
7ba24713 AA |
1866 | static struct iscsi_transport iscsi_tcp_transport = { |
1867 | .owner = THIS_MODULE, | |
1868 | .name = "tcp", | |
1869 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1870 | | CAP_DATADGST, | |
fd7255f5 MC |
1871 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
1872 | ISCSI_MAX_XMIT_DLENGTH | | |
1873 | ISCSI_HDRDGST_EN | | |
1874 | ISCSI_DATADGST_EN | | |
1875 | ISCSI_INITIAL_R2T_EN | | |
1876 | ISCSI_MAX_R2T | | |
1877 | ISCSI_IMM_DATA_EN | | |
1878 | ISCSI_FIRST_BURST | | |
1879 | ISCSI_MAX_BURST | | |
1880 | ISCSI_PDU_INORDER_EN | | |
1881 | ISCSI_DATASEQ_INORDER_EN | | |
1882 | ISCSI_ERL | | |
1883 | ISCSI_CONN_PORT | | |
8d2860b3 | 1884 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
1885 | ISCSI_EXP_STATSN | |
1886 | ISCSI_PERSISTENT_PORT | | |
1887 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
1888 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
1889 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 1890 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c MC |
1891 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
1892 | ISCSI_LU_RESET_TMO | | |
88dfd340 MC |
1893 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
1894 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
22236961 | 1895 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
1896 | ISCSI_HOST_INITIATOR_NAME | |
1897 | ISCSI_HOST_NETDEV_NAME, | |
5bb0b55a MC |
1898 | /* session management */ |
1899 | .create_session = iscsi_tcp_session_create, | |
1900 | .destroy_session = iscsi_tcp_session_destroy, | |
1901 | /* connection management */ | |
1902 | .create_conn = iscsi_tcp_conn_create, | |
1903 | .bind_conn = iscsi_tcp_conn_bind, | |
1904 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 1905 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 1906 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 1907 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1908 | .start_conn = iscsi_conn_start, |
1c83469d | 1909 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 | 1910 | /* iscsi host params */ |
75613521 | 1911 | .get_host_param = iscsi_host_get_param, |
0801c242 | 1912 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1913 | /* IO */ |
7ba24713 AA |
1914 | .send_pdu = iscsi_conn_send_pdu, |
1915 | .get_stats = iscsi_conn_get_stats, | |
e5a7efef | 1916 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1917 | .init_task = iscsi_tcp_task_init, |
1918 | .xmit_task = iscsi_tcp_task_xmit, | |
1919 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef MC |
1920 | /* low level pdu helpers */ |
1921 | .xmit_pdu = iscsi_tcp_flush, | |
1922 | .init_pdu = iscsi_tcp_pdu_init, | |
1923 | .alloc_pdu = iscsi_tcp_pdu_alloc, | |
5bb0b55a | 1924 | /* recovery */ |
30a6c652 | 1925 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1926 | }; |
1927 | ||
1928 | static int __init | |
1929 | iscsi_tcp_init(void) | |
1930 | { | |
7ba24713 | 1931 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1932 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1933 | iscsi_max_lun); | |
7ba24713 AA |
1934 | return -EINVAL; |
1935 | } | |
7ba24713 | 1936 | |
75613521 MC |
1937 | iscsi_tcp_scsi_transport = iscsi_register_transport( |
1938 | &iscsi_tcp_transport); | |
1939 | if (!iscsi_tcp_scsi_transport) | |
ffbfe925 | 1940 | return -ENODEV; |
7ba24713 | 1941 | |
7b8631b5 | 1942 | return 0; |
7ba24713 AA |
1943 | } |
1944 | ||
1945 | static void __exit | |
1946 | iscsi_tcp_exit(void) | |
1947 | { | |
1948 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
1949 | } |
1950 | ||
1951 | module_init(iscsi_tcp_init); | |
1952 | module_exit(iscsi_tcp_exit); |