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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 | ||
7ba24713 AA |
60 | #ifndef DEBUG_ASSERT |
61 | #ifdef BUG_ON | |
62 | #undef BUG_ON | |
63 | #endif | |
64 | #define BUG_ON(expr) | |
65 | #endif | |
66 | ||
7ba24713 AA |
67 | static unsigned int iscsi_max_lun = 512; |
68 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
69 | ||
da32dd68 | 70 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, |
a8ac6311 | 71 | struct iscsi_segment *segment); |
7ba24713 | 72 | |
da32dd68 | 73 | /* |
a8ac6311 | 74 | * Scatterlist handling: inside the iscsi_segment, we |
da32dd68 OK |
75 | * remember an index into the scatterlist, and set data/size |
76 | * to the current scatterlist entry. For highmem pages, we | |
77 | * kmap as needed. | |
78 | * | |
79 | * Note that the page is unmapped when we return from | |
80 | * TCP's data_ready handler, so we may end up mapping and | |
81 | * unmapping the same page repeatedly. The whole reason | |
82 | * for this is that we shouldn't keep the page mapped | |
83 | * outside the softirq. | |
84 | */ | |
85 | ||
86 | /** | |
a8ac6311 OK |
87 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry |
88 | * @segment: the buffer object | |
89 | * @sg: scatterlist | |
da32dd68 OK |
90 | * @offset: byte offset into that sg entry |
91 | * | |
a8ac6311 | 92 | * This function sets up the segment so that subsequent |
da32dd68 OK |
93 | * data is copied to the indicated sg entry, at the given |
94 | * offset. | |
95 | */ | |
96 | static inline void | |
a8ac6311 OK |
97 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, |
98 | struct scatterlist *sg, unsigned int offset) | |
da32dd68 | 99 | { |
a8ac6311 OK |
100 | segment->sg = sg; |
101 | segment->sg_offset = offset; | |
102 | segment->size = min(sg->length - offset, | |
103 | segment->total_size - segment->total_copied); | |
104 | segment->data = NULL; | |
da32dd68 OK |
105 | } |
106 | ||
107 | /** | |
a8ac6311 OK |
108 | * iscsi_tcp_segment_map - map the current S/G page |
109 | * @segment: iscsi_segment | |
110 | * @recv: 1 if called from recv path | |
da32dd68 OK |
111 | * |
112 | * We only need to possibly kmap data if scatter lists are being used, | |
113 | * because the iscsi passthrough and internal IO paths will never use high | |
114 | * mem pages. | |
115 | */ | |
116 | static inline void | |
a8ac6311 | 117 | iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) |
da32dd68 OK |
118 | { |
119 | struct scatterlist *sg; | |
120 | ||
a8ac6311 | 121 | if (segment->data != NULL || !segment->sg) |
da32dd68 OK |
122 | return; |
123 | ||
a8ac6311 OK |
124 | sg = segment->sg; |
125 | BUG_ON(segment->sg_mapped); | |
da32dd68 | 126 | BUG_ON(sg->length == 0); |
a8ac6311 OK |
127 | |
128 | /* | |
129 | * If the page count is greater than one it is ok to send | |
130 | * to the network layer's zero copy send path. If not we | |
131 | * have to go the slow sendmsg path. We always map for the | |
132 | * recv path. | |
133 | */ | |
134 | if (page_count(sg_page(sg)) >= 1 && !recv) | |
135 | return; | |
136 | ||
137 | debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit", | |
138 | segment); | |
139 | segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0); | |
140 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; | |
da32dd68 OK |
141 | } |
142 | ||
143 | static inline void | |
a8ac6311 | 144 | iscsi_tcp_segment_unmap(struct iscsi_segment *segment) |
da32dd68 | 145 | { |
a8ac6311 OK |
146 | debug_tcp("iscsi_tcp_segment_unmap %p\n", segment); |
147 | ||
148 | if (segment->sg_mapped) { | |
149 | debug_tcp("iscsi_tcp_segment_unmap valid\n"); | |
150 | kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0); | |
151 | segment->sg_mapped = NULL; | |
152 | segment->data = NULL; | |
da32dd68 OK |
153 | } |
154 | } | |
155 | ||
156 | /* | |
157 | * Splice the digest buffer into the buffer | |
158 | */ | |
159 | static inline void | |
a8ac6311 | 160 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) |
da32dd68 | 161 | { |
a8ac6311 OK |
162 | segment->data = digest; |
163 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
164 | segment->total_size += ISCSI_DIGEST_SIZE; | |
165 | segment->size = ISCSI_DIGEST_SIZE; | |
166 | segment->copied = 0; | |
167 | segment->sg = NULL; | |
168 | segment->hash = NULL; | |
da32dd68 OK |
169 | } |
170 | ||
171 | /** | |
a8ac6311 OK |
172 | * iscsi_tcp_segment_done - check whether the segment is complete |
173 | * @segment: iscsi segment to check | |
174 | * @recv: set to one of this is called from the recv path | |
175 | * @copied: number of bytes copied | |
da32dd68 | 176 | * |
a8ac6311 | 177 | * Check if we're done receiving this segment. If the receive |
da32dd68 OK |
178 | * buffer is full but we expect more data, move on to the |
179 | * next entry in the scatterlist. | |
180 | * | |
181 | * If the amount of data we received isn't a multiple of 4, | |
182 | * we will transparently receive the pad bytes, too. | |
183 | * | |
184 | * This function must be re-entrant. | |
185 | */ | |
7ba24713 | 186 | static inline int |
a8ac6311 | 187 | iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied) |
7ba24713 | 188 | { |
da32dd68 | 189 | static unsigned char padbuf[ISCSI_PAD_LEN]; |
a8ac6311 | 190 | struct scatterlist sg; |
004d6530 | 191 | unsigned int pad; |
da32dd68 | 192 | |
a8ac6311 OK |
193 | debug_tcp("copied %u %u size %u %s\n", segment->copied, copied, |
194 | segment->size, recv ? "recv" : "xmit"); | |
195 | if (segment->hash && copied) { | |
196 | /* | |
197 | * If a segment is kmapd we must unmap it before sending | |
198 | * to the crypto layer since that will try to kmap it again. | |
199 | */ | |
200 | iscsi_tcp_segment_unmap(segment); | |
201 | ||
202 | if (!segment->data) { | |
203 | sg_init_table(&sg, 1); | |
204 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
205 | segment->copied + segment->sg_offset + | |
206 | segment->sg->offset); | |
207 | } else | |
208 | sg_init_one(&sg, segment->data + segment->copied, | |
209 | copied); | |
210 | crypto_hash_update(segment->hash, &sg, copied); | |
211 | } | |
212 | ||
213 | segment->copied += copied; | |
214 | if (segment->copied < segment->size) { | |
215 | iscsi_tcp_segment_map(segment, recv); | |
da32dd68 OK |
216 | return 0; |
217 | } | |
7ba24713 | 218 | |
a8ac6311 OK |
219 | segment->total_copied += segment->copied; |
220 | segment->copied = 0; | |
221 | segment->size = 0; | |
7ba24713 | 222 | |
da32dd68 | 223 | /* Unmap the current scatterlist page, if there is one. */ |
a8ac6311 | 224 | iscsi_tcp_segment_unmap(segment); |
da32dd68 OK |
225 | |
226 | /* Do we have more scatterlist entries? */ | |
a8ac6311 OK |
227 | debug_tcp("total copied %u total size %u\n", segment->total_copied, |
228 | segment->total_size); | |
229 | if (segment->total_copied < segment->total_size) { | |
da32dd68 | 230 | /* Proceed to the next entry in the scatterlist. */ |
a8ac6311 OK |
231 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), |
232 | 0); | |
233 | iscsi_tcp_segment_map(segment, recv); | |
234 | BUG_ON(segment->size == 0); | |
da32dd68 OK |
235 | return 0; |
236 | } | |
237 | ||
238 | /* Do we need to handle padding? */ | |
a8ac6311 | 239 | pad = iscsi_padding(segment->total_copied); |
004d6530 | 240 | if (pad != 0) { |
da32dd68 | 241 | debug_tcp("consume %d pad bytes\n", pad); |
a8ac6311 OK |
242 | segment->total_size += pad; |
243 | segment->size = pad; | |
244 | segment->data = padbuf; | |
da32dd68 OK |
245 | return 0; |
246 | } | |
247 | ||
248 | /* | |
a8ac6311 | 249 | * Set us up for transferring the data digest. hdr digest |
da32dd68 OK |
250 | * is completely handled in hdr done function. |
251 | */ | |
a8ac6311 OK |
252 | if (segment->hash) { |
253 | crypto_hash_final(segment->hash, segment->digest); | |
254 | iscsi_tcp_segment_splice_digest(segment, | |
255 | recv ? segment->recv_digest : segment->digest); | |
256 | return 0; | |
da32dd68 | 257 | } |
7ba24713 | 258 | |
da32dd68 OK |
259 | return 1; |
260 | } | |
7ba24713 | 261 | |
da32dd68 | 262 | /** |
a8ac6311 | 263 | * iscsi_tcp_xmit_segment - transmit segment |
da32dd68 | 264 | * @tcp_conn: the iSCSI TCP connection |
a8ac6311 OK |
265 | * @segment: the buffer to transmnit |
266 | * | |
267 | * This function transmits as much of the buffer as | |
268 | * the network layer will accept, and returns the number of | |
269 | * bytes transmitted. | |
270 | * | |
271 | * If CRC hashing is enabled, the function will compute the | |
272 | * hash as it goes. When the entire segment has been transmitted, | |
273 | * it will retrieve the hash value and send it as well. | |
274 | */ | |
275 | static int | |
276 | iscsi_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, | |
277 | struct iscsi_segment *segment) | |
278 | { | |
279 | struct socket *sk = tcp_conn->sock; | |
280 | unsigned int copied = 0; | |
281 | int r = 0; | |
282 | ||
283 | while (!iscsi_tcp_segment_done(segment, 0, r)) { | |
284 | struct scatterlist *sg; | |
285 | unsigned int offset, copy; | |
286 | int flags = 0; | |
287 | ||
288 | r = 0; | |
289 | offset = segment->copied; | |
290 | copy = segment->size - offset; | |
291 | ||
292 | if (segment->total_copied + segment->size < segment->total_size) | |
293 | flags |= MSG_MORE; | |
294 | ||
295 | /* Use sendpage if we can; else fall back to sendmsg */ | |
296 | if (!segment->data) { | |
297 | sg = segment->sg; | |
298 | offset += segment->sg_offset + sg->offset; | |
299 | r = tcp_conn->sendpage(sk, sg_page(sg), offset, copy, | |
300 | flags); | |
301 | } else { | |
302 | struct msghdr msg = { .msg_flags = flags }; | |
303 | struct kvec iov = { | |
304 | .iov_base = segment->data + offset, | |
305 | .iov_len = copy | |
306 | }; | |
307 | ||
308 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
309 | } | |
310 | ||
311 | if (r < 0) { | |
312 | iscsi_tcp_segment_unmap(segment); | |
313 | if (copied || r == -EAGAIN) | |
314 | break; | |
315 | return r; | |
316 | } | |
317 | copied += r; | |
318 | } | |
319 | return copied; | |
320 | } | |
321 | ||
322 | /** | |
323 | * iscsi_tcp_segment_recv - copy data to segment | |
324 | * @tcp_conn: the iSCSI TCP connection | |
325 | * @segment: the buffer to copy to | |
da32dd68 OK |
326 | * @ptr: data pointer |
327 | * @len: amount of data available | |
328 | * | |
329 | * This function copies up to @len bytes to the | |
330 | * given buffer, and returns the number of bytes | |
331 | * consumed, which can actually be less than @len. | |
332 | * | |
333 | * If hash digest is enabled, the function will update the | |
334 | * hash while copying. | |
335 | * Combining these two operations doesn't buy us a lot (yet), | |
336 | * but in the future we could implement combined copy+crc, | |
337 | * just way we do for network layer checksums. | |
338 | */ | |
339 | static int | |
a8ac6311 OK |
340 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, |
341 | struct iscsi_segment *segment, const void *ptr, | |
342 | unsigned int len) | |
da32dd68 | 343 | { |
a8ac6311 | 344 | unsigned int copy = 0, copied = 0; |
7ba24713 | 345 | |
a8ac6311 OK |
346 | while (!iscsi_tcp_segment_done(segment, 1, copy)) { |
347 | if (copied == len) { | |
348 | debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n", | |
349 | len); | |
350 | break; | |
da32dd68 | 351 | } |
a8ac6311 OK |
352 | |
353 | copy = min(len - copied, segment->size - segment->copied); | |
354 | debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy); | |
355 | memcpy(segment->data + segment->copied, ptr + copied, copy); | |
da32dd68 OK |
356 | copied += copy; |
357 | } | |
da32dd68 OK |
358 | return copied; |
359 | } | |
360 | ||
361 | static inline void | |
362 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
363 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
364 | { | |
365 | struct scatterlist sg; | |
7ba24713 | 366 | |
da32dd68 OK |
367 | sg_init_one(&sg, hdr, hdrlen); |
368 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
369 | } | |
370 | ||
371 | static inline int | |
372 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 373 | struct iscsi_segment *segment) |
da32dd68 | 374 | { |
a8ac6311 | 375 | if (!segment->digest_len) |
da32dd68 OK |
376 | return 1; |
377 | ||
a8ac6311 OK |
378 | if (memcmp(segment->recv_digest, segment->digest, |
379 | segment->digest_len)) { | |
da32dd68 OK |
380 | debug_scsi("digest mismatch\n"); |
381 | return 0; | |
382 | } | |
383 | ||
384 | return 1; | |
385 | } | |
386 | ||
387 | /* | |
a8ac6311 | 388 | * Helper function to set up segment buffer |
da32dd68 OK |
389 | */ |
390 | static inline void | |
a8ac6311 OK |
391 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, |
392 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
da32dd68 | 393 | { |
a8ac6311 OK |
394 | memset(segment, 0, sizeof(*segment)); |
395 | segment->total_size = size; | |
396 | segment->done = done; | |
da32dd68 OK |
397 | |
398 | if (hash) { | |
a8ac6311 | 399 | segment->hash = hash; |
da32dd68 OK |
400 | crypto_hash_init(hash); |
401 | } | |
402 | } | |
403 | ||
404 | static inline void | |
a8ac6311 OK |
405 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, |
406 | size_t size, iscsi_segment_done_fn_t *done, | |
407 | struct hash_desc *hash) | |
da32dd68 | 408 | { |
a8ac6311 OK |
409 | __iscsi_segment_init(segment, size, done, hash); |
410 | segment->data = data; | |
411 | segment->size = size; | |
da32dd68 OK |
412 | } |
413 | ||
414 | static inline int | |
a8ac6311 OK |
415 | iscsi_segment_seek_sg(struct iscsi_segment *segment, |
416 | struct scatterlist *sg_list, unsigned int sg_count, | |
417 | unsigned int offset, size_t size, | |
418 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
da32dd68 | 419 | { |
a8ac6311 | 420 | struct scatterlist *sg; |
da32dd68 OK |
421 | unsigned int i; |
422 | ||
a8ac6311 OK |
423 | debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n", |
424 | offset, size); | |
425 | __iscsi_segment_init(segment, size, done, hash); | |
426 | for_each_sg(sg_list, sg, sg_count, i) { | |
427 | debug_scsi("sg %d, len %u offset %u\n", i, sg->length, | |
428 | sg->offset); | |
429 | if (offset < sg->length) { | |
430 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
da32dd68 | 431 | return 0; |
7ba24713 | 432 | } |
a8ac6311 | 433 | offset -= sg->length; |
7ba24713 AA |
434 | } |
435 | ||
da32dd68 OK |
436 | return ISCSI_ERR_DATA_OFFSET; |
437 | } | |
438 | ||
439 | /** | |
a8ac6311 | 440 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception |
da32dd68 OK |
441 | * @tcp_conn: iscsi connection to prep for |
442 | * | |
443 | * This function always passes NULL for the hash argument, because when this | |
444 | * function is called we do not yet know the final size of the header and want | |
445 | * to delay the digest processing until we know that. | |
446 | */ | |
447 | static void | |
448 | iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
449 | { | |
450 | debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn, | |
451 | tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : ""); | |
a8ac6311 | 452 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
da32dd68 OK |
453 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), |
454 | iscsi_tcp_hdr_recv_done, NULL); | |
455 | } | |
456 | ||
457 | /* | |
458 | * Handle incoming reply to any other type of command | |
459 | */ | |
460 | static int | |
461 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 462 | struct iscsi_segment *segment) |
da32dd68 OK |
463 | { |
464 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
465 | int rc = 0; | |
466 | ||
a8ac6311 | 467 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
da32dd68 OK |
468 | return ISCSI_ERR_DATA_DGST; |
469 | ||
470 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
471 | conn->data, tcp_conn->in.datalen); | |
472 | if (rc) | |
473 | return rc; | |
474 | ||
475 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
476 | return 0; |
477 | } | |
478 | ||
da32dd68 OK |
479 | static void |
480 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
481 | { | |
482 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
483 | struct hash_desc *rx_hash = NULL; | |
484 | ||
485 | if (conn->datadgst_en) | |
486 | rx_hash = &tcp_conn->rx_hash; | |
487 | ||
a8ac6311 | 488 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
da32dd68 OK |
489 | conn->data, tcp_conn->in.datalen, |
490 | iscsi_tcp_data_recv_done, rx_hash); | |
491 | } | |
492 | ||
30a6c652 MC |
493 | /* |
494 | * must be called with session lock | |
495 | */ | |
496 | static void | |
b6c395ed | 497 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 498 | { |
5bb0b55a | 499 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 500 | struct iscsi_r2t_info *r2t; |
7ba24713 | 501 | |
b6c395ed MC |
502 | /* flush ctask's r2t queues */ |
503 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
504 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
505 | sizeof(void*)); | |
506 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
507 | } | |
508 | ||
a8ac6311 OK |
509 | r2t = tcp_ctask->r2t; |
510 | if (r2t != NULL) { | |
511 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
512 | sizeof(void*)); | |
513 | tcp_ctask->r2t = NULL; | |
514 | } | |
7ba24713 AA |
515 | } |
516 | ||
517 | /** | |
518 | * iscsi_data_rsp - SCSI Data-In Response processing | |
519 | * @conn: iscsi connection | |
520 | * @ctask: scsi command task | |
521 | **/ | |
522 | static int | |
523 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
524 | { | |
5bb0b55a MC |
525 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
526 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
527 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 | 528 | struct iscsi_session *session = conn->session; |
857ae0bd | 529 | struct scsi_cmnd *sc = ctask->sc; |
7ba24713 | 530 | int datasn = be32_to_cpu(rhdr->datasn); |
94795b61 | 531 | unsigned total_in_length = scsi_in(sc)->length; |
7ba24713 | 532 | |
77a23c21 | 533 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
5bb0b55a | 534 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
535 | return 0; |
536 | ||
d473cc7f MC |
537 | if (tcp_ctask->exp_datasn != datasn) { |
538 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
539 | __FUNCTION__, tcp_ctask->exp_datasn, datasn); | |
7ba24713 | 540 | return ISCSI_ERR_DATASN; |
d473cc7f | 541 | } |
7ba24713 | 542 | |
d473cc7f | 543 | tcp_ctask->exp_datasn++; |
7ba24713 | 544 | |
5bb0b55a | 545 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
94795b61 | 546 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > total_in_length) { |
857ae0bd MC |
547 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", |
548 | __FUNCTION__, tcp_ctask->data_offset, | |
94795b61 | 549 | tcp_conn->in.datalen, total_in_length); |
7ba24713 | 550 | return ISCSI_ERR_DATA_OFFSET; |
857ae0bd | 551 | } |
7ba24713 AA |
552 | |
553 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
7207fea4 | 554 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
7ba24713 | 555 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
7207fea4 BH |
556 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | |
557 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
7ba24713 AA |
558 | int res_count = be32_to_cpu(rhdr->residual_count); |
559 | ||
560 | if (res_count > 0 && | |
7207fea4 | 561 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || |
94795b61 BH |
562 | res_count <= total_in_length)) |
563 | scsi_in(sc)->resid = res_count; | |
7207fea4 | 564 | else |
7ba24713 AA |
565 | sc->result = (DID_BAD_TARGET << 16) | |
566 | rhdr->cmd_status; | |
7207fea4 | 567 | } |
7ba24713 AA |
568 | } |
569 | ||
570 | conn->datain_pdus_cnt++; | |
571 | return 0; | |
572 | } | |
573 | ||
574 | /** | |
575 | * iscsi_solicit_data_init - initialize first Data-Out | |
576 | * @conn: iscsi connection | |
577 | * @ctask: scsi command task | |
578 | * @r2t: R2T info | |
579 | * | |
580 | * Notes: | |
581 | * Initialize first Data-Out within this R2T sequence and finds | |
582 | * proper data_offset within this SCSI command. | |
583 | * | |
584 | * This function is called with connection lock taken. | |
585 | **/ | |
586 | static void | |
587 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
588 | struct iscsi_r2t_info *r2t) | |
589 | { | |
590 | struct iscsi_data *hdr; | |
7ba24713 | 591 | |
ffbfe925 | 592 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
593 | memset(hdr, 0, sizeof(struct iscsi_data)); |
594 | hdr->ttt = r2t->ttt; | |
595 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
596 | r2t->solicit_datasn++; | |
597 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
598 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
599 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
600 | hdr->exp_statsn = r2t->exp_statsn; |
601 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
602 | if (r2t->data_length > conn->max_xmit_dlength) { | |
603 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
604 | r2t->data_count = conn->max_xmit_dlength; | |
605 | hdr->flags = 0; | |
606 | } else { | |
607 | hton24(hdr->dlength, r2t->data_length); | |
608 | r2t->data_count = r2t->data_length; | |
609 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
610 | } | |
611 | conn->dataout_pdus_cnt++; | |
612 | ||
613 | r2t->sent = 0; | |
7ba24713 AA |
614 | } |
615 | ||
616 | /** | |
617 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
618 | * @conn: iscsi connection | |
619 | * @ctask: scsi command task | |
620 | **/ | |
621 | static int | |
622 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
623 | { | |
624 | struct iscsi_r2t_info *r2t; | |
625 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
626 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
627 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
628 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
629 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
630 | int rc; | |
631 | ||
98a9416a | 632 | if (tcp_conn->in.datalen) { |
322d739d MC |
633 | iscsi_conn_printk(KERN_ERR, conn, |
634 | "invalid R2t with datalen %d\n", | |
635 | tcp_conn->in.datalen); | |
7ba24713 | 636 | return ISCSI_ERR_DATALEN; |
98a9416a | 637 | } |
7ba24713 | 638 | |
d473cc7f MC |
639 | if (tcp_ctask->exp_datasn != r2tsn){ |
640 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
641 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
7ba24713 | 642 | return ISCSI_ERR_R2TSN; |
d473cc7f | 643 | } |
7ba24713 | 644 | |
7ba24713 | 645 | /* fill-in new R2T associated with the task */ |
77a23c21 MC |
646 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
647 | ||
843c0a8a | 648 | if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) { |
322d739d MC |
649 | iscsi_conn_printk(KERN_INFO, conn, |
650 | "dropping R2T itt %d in recovery.\n", | |
651 | ctask->itt); | |
7ba24713 AA |
652 | return 0; |
653 | } | |
b6c395ed | 654 | |
5bb0b55a | 655 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
656 | BUG_ON(!rc); |
657 | ||
658 | r2t->exp_statsn = rhdr->statsn; | |
659 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a | 660 | if (r2t->data_length == 0) { |
322d739d MC |
661 | iscsi_conn_printk(KERN_ERR, conn, |
662 | "invalid R2T with zero data len\n"); | |
03766a1d OK |
663 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, |
664 | sizeof(void*)); | |
7ba24713 AA |
665 | return ISCSI_ERR_DATALEN; |
666 | } | |
667 | ||
98a9416a MC |
668 | if (r2t->data_length > session->max_burst) |
669 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
670 | "Attempting to execute request.\n", | |
671 | r2t->data_length, session->max_burst); | |
672 | ||
7ba24713 | 673 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
94795b61 | 674 | if (r2t->data_offset + r2t->data_length > scsi_out(ctask->sc)->length) { |
322d739d MC |
675 | iscsi_conn_printk(KERN_ERR, conn, |
676 | "invalid R2T with data len %u at offset %u " | |
677 | "and total length %d\n", r2t->data_length, | |
94795b61 | 678 | r2t->data_offset, scsi_out(ctask->sc)->length); |
03766a1d OK |
679 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, |
680 | sizeof(void*)); | |
7ba24713 AA |
681 | return ISCSI_ERR_DATALEN; |
682 | } | |
683 | ||
684 | r2t->ttt = rhdr->ttt; /* no flip */ | |
685 | r2t->solicit_datasn = 0; | |
686 | ||
687 | iscsi_solicit_data_init(conn, ctask, r2t); | |
688 | ||
d473cc7f | 689 | tcp_ctask->exp_datasn = r2tsn + 1; |
5bb0b55a | 690 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 691 | conn->r2t_pdus_cnt++; |
843c0a8a MC |
692 | |
693 | iscsi_requeue_ctask(ctask); | |
7ba24713 AA |
694 | return 0; |
695 | } | |
696 | ||
da32dd68 OK |
697 | /* |
698 | * Handle incoming reply to DataIn command | |
699 | */ | |
700 | static int | |
701 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 702 | struct iscsi_segment *segment) |
da32dd68 OK |
703 | { |
704 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
705 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
706 | int rc; | |
707 | ||
a8ac6311 | 708 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
da32dd68 OK |
709 | return ISCSI_ERR_DATA_DGST; |
710 | ||
711 | /* check for non-exceptional status */ | |
712 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
713 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
714 | if (rc) | |
715 | return rc; | |
716 | } | |
717 | ||
718 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
719 | return 0; | |
720 | } | |
721 | ||
722 | /** | |
723 | * iscsi_tcp_hdr_dissect - process PDU header | |
724 | * @conn: iSCSI connection | |
725 | * @hdr: PDU header | |
726 | * | |
727 | * This function analyzes the header of the PDU received, | |
728 | * and performs several sanity checks. If the PDU is accompanied | |
729 | * by data, the receive buffer is set up to copy the incoming data | |
730 | * to the correct location. | |
731 | */ | |
7ba24713 | 732 | static int |
da32dd68 | 733 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
7ba24713 | 734 | { |
5bb0b55a | 735 | int rc = 0, opcode, ahslen; |
7ba24713 | 736 | struct iscsi_session *session = conn->session; |
5bb0b55a | 737 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
da32dd68 OK |
738 | struct iscsi_cmd_task *ctask; |
739 | uint32_t itt; | |
7ba24713 AA |
740 | |
741 | /* verify PDU length */ | |
5bb0b55a MC |
742 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
743 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
322d739d MC |
744 | iscsi_conn_printk(KERN_ERR, conn, |
745 | "iscsi_tcp: datalen %d > %d\n", | |
746 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
7ba24713 AA |
747 | return ISCSI_ERR_DATALEN; |
748 | } | |
7ba24713 | 749 | |
da32dd68 OK |
750 | /* Additional header segments. So far, we don't |
751 | * process additional headers. | |
752 | */ | |
5bb0b55a | 753 | ahslen = hdr->hlength << 2; |
7ba24713 | 754 | |
5bb0b55a | 755 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 756 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a | 757 | rc = iscsi_verify_itt(conn, hdr, &itt); |
7a53dc52 | 758 | if (rc) |
5bb0b55a | 759 | return rc; |
7ba24713 | 760 | |
da32dd68 OK |
761 | debug_tcp("opcode 0x%x ahslen %d datalen %d\n", |
762 | opcode, ahslen, tcp_conn->in.datalen); | |
7ba24713 | 763 | |
5bb0b55a MC |
764 | switch(opcode) { |
765 | case ISCSI_OP_SCSI_DATA_IN: | |
da32dd68 | 766 | ctask = session->cmds[itt]; |
4545a88f | 767 | spin_lock(&conn->session->lock); |
da32dd68 | 768 | rc = iscsi_data_rsp(conn, ctask); |
4545a88f | 769 | spin_unlock(&conn->session->lock); |
275fd7d1 MC |
770 | if (rc) |
771 | return rc; | |
da32dd68 OK |
772 | if (tcp_conn->in.datalen) { |
773 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
774 | struct hash_desc *rx_hash = NULL; | |
94795b61 | 775 | struct scsi_data_buffer *sdb = scsi_in(ctask->sc); |
da32dd68 OK |
776 | |
777 | /* | |
778 | * Setup copy of Data-In into the Scsi_Cmnd | |
779 | * Scatterlist case: | |
a8ac6311 | 780 | * We set up the iscsi_segment to point to the next |
da32dd68 OK |
781 | * scatterlist entry to copy to. As we go along, |
782 | * we move on to the next scatterlist entry and | |
783 | * update the digest per-entry. | |
784 | */ | |
785 | if (conn->datadgst_en) | |
786 | rx_hash = &tcp_conn->rx_hash; | |
787 | ||
788 | debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, " | |
789 | "datalen=%d)\n", tcp_conn, | |
790 | tcp_ctask->data_offset, | |
791 | tcp_conn->in.datalen); | |
a8ac6311 | 792 | return iscsi_segment_seek_sg(&tcp_conn->in.segment, |
94795b61 BH |
793 | sdb->table.sgl, |
794 | sdb->table.nents, | |
a8ac6311 OK |
795 | tcp_ctask->data_offset, |
796 | tcp_conn->in.datalen, | |
797 | iscsi_tcp_process_data_in, | |
798 | rx_hash); | |
da32dd68 | 799 | } |
5bb0b55a MC |
800 | /* fall through */ |
801 | case ISCSI_OP_SCSI_CMD_RSP: | |
da32dd68 OK |
802 | if (tcp_conn->in.datalen) { |
803 | iscsi_tcp_data_recv_prep(tcp_conn); | |
804 | return 0; | |
805 | } | |
806 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
5bb0b55a MC |
807 | break; |
808 | case ISCSI_OP_R2T: | |
da32dd68 | 809 | ctask = session->cmds[itt]; |
5bb0b55a MC |
810 | if (ahslen) |
811 | rc = ISCSI_ERR_AHSLEN; | |
4545a88f MC |
812 | else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) { |
813 | spin_lock(&session->lock); | |
da32dd68 | 814 | rc = iscsi_r2t_rsp(conn, ctask); |
4545a88f MC |
815 | spin_unlock(&session->lock); |
816 | } else | |
5bb0b55a MC |
817 | rc = ISCSI_ERR_PROTO; |
818 | break; | |
819 | case ISCSI_OP_LOGIN_RSP: | |
820 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
821 | case ISCSI_OP_REJECT: |
822 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
823 | /* |
824 | * It is possible that we could get a PDU with a buffer larger | |
825 | * than 8K, but there are no targets that currently do this. | |
826 | * For now we fail until we find a vendor that needs it | |
827 | */ | |
da32dd68 | 828 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { |
322d739d MC |
829 | iscsi_conn_printk(KERN_ERR, conn, |
830 | "iscsi_tcp: received buffer of " | |
831 | "len %u but conn buffer is only %u " | |
832 | "(opcode %0x)\n", | |
833 | tcp_conn->in.datalen, | |
834 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
c8dc1e52 MC |
835 | rc = ISCSI_ERR_PROTO; |
836 | break; | |
837 | } | |
838 | ||
da32dd68 OK |
839 | /* If there's data coming in with the response, |
840 | * receive it to the connection's buffer. | |
841 | */ | |
842 | if (tcp_conn->in.datalen) { | |
843 | iscsi_tcp_data_recv_prep(tcp_conn); | |
844 | return 0; | |
845 | } | |
5bb0b55a | 846 | /* fall through */ |
c8dc1e52 MC |
847 | case ISCSI_OP_LOGOUT_RSP: |
848 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
849 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
850 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
851 | break; | |
852 | default: | |
853 | rc = ISCSI_ERR_BAD_OPCODE; | |
854 | break; | |
855 | } | |
7ba24713 | 856 | |
da32dd68 OK |
857 | if (rc == 0) { |
858 | /* Anything that comes with data should have | |
859 | * been handled above. */ | |
860 | if (tcp_conn->in.datalen) | |
861 | return ISCSI_ERR_PROTO; | |
862 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
863 | } |
864 | ||
da32dd68 | 865 | return rc; |
7ba24713 AA |
866 | } |
867 | ||
da32dd68 OK |
868 | /** |
869 | * iscsi_tcp_hdr_recv_done - process PDU header | |
870 | * | |
871 | * This is the callback invoked when the PDU header has | |
872 | * been received. If the header is followed by additional | |
873 | * header segments, we go back for more data. | |
874 | */ | |
875 | static int | |
876 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
a8ac6311 | 877 | struct iscsi_segment *segment) |
7ba24713 | 878 | { |
da32dd68 OK |
879 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; |
880 | struct iscsi_hdr *hdr; | |
7ba24713 | 881 | |
da32dd68 OK |
882 | /* Check if there are additional header segments |
883 | * *prior* to computing the digest, because we | |
884 | * may need to go back to the caller for more. | |
885 | */ | |
886 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
a8ac6311 | 887 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { |
da32dd68 OK |
888 | /* Bump the header length - the caller will |
889 | * just loop around and get the AHS for us, and | |
890 | * call again. */ | |
891 | unsigned int ahslen = hdr->hlength << 2; | |
892 | ||
893 | /* Make sure we don't overflow */ | |
894 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
895 | return ISCSI_ERR_AHSLEN; | |
896 | ||
a8ac6311 OK |
897 | segment->total_size += ahslen; |
898 | segment->size += ahslen; | |
da32dd68 | 899 | return 0; |
7ba24713 AA |
900 | } |
901 | ||
da32dd68 OK |
902 | /* We're done processing the header. See if we're doing |
903 | * header digests; if so, set up the recv_digest buffer | |
904 | * and go back for more. */ | |
905 | if (conn->hdrdgst_en) { | |
a8ac6311 OK |
906 | if (segment->digest_len == 0) { |
907 | iscsi_tcp_segment_splice_digest(segment, | |
908 | segment->recv_digest); | |
da32dd68 | 909 | return 0; |
7ba24713 | 910 | } |
da32dd68 | 911 | iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr, |
a8ac6311 OK |
912 | segment->total_copied - ISCSI_DIGEST_SIZE, |
913 | segment->digest); | |
7ba24713 | 914 | |
a8ac6311 | 915 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
da32dd68 | 916 | return ISCSI_ERR_HDR_DGST; |
7ba24713 | 917 | } |
da32dd68 OK |
918 | |
919 | tcp_conn->in.hdr = hdr; | |
920 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
7ba24713 AA |
921 | } |
922 | ||
923 | /** | |
da32dd68 | 924 | * iscsi_tcp_recv - TCP receive in sendfile fashion |
7ba24713 AA |
925 | * @rd_desc: read descriptor |
926 | * @skb: socket buffer | |
927 | * @offset: offset in skb | |
928 | * @len: skb->len - offset | |
929 | **/ | |
930 | static int | |
da32dd68 OK |
931 | iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
932 | unsigned int offset, size_t len) | |
7ba24713 | 933 | { |
7ba24713 | 934 | struct iscsi_conn *conn = rd_desc->arg.data; |
5bb0b55a | 935 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
a8ac6311 | 936 | struct iscsi_segment *segment = &tcp_conn->in.segment; |
da32dd68 OK |
937 | struct skb_seq_state seq; |
938 | unsigned int consumed = 0; | |
939 | int rc = 0; | |
7ba24713 | 940 | |
da32dd68 | 941 | debug_tcp("in %d bytes\n", skb->len - offset); |
7ba24713 AA |
942 | |
943 | if (unlikely(conn->suspend_rx)) { | |
944 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
945 | return 0; | |
946 | } | |
947 | ||
da32dd68 OK |
948 | skb_prepare_seq_read(skb, offset, skb->len, &seq); |
949 | while (1) { | |
950 | unsigned int avail; | |
951 | const u8 *ptr; | |
7ba24713 | 952 | |
da32dd68 | 953 | avail = skb_seq_read(consumed, &ptr, &seq); |
a8ac6311 OK |
954 | if (avail == 0) { |
955 | debug_tcp("no more data avail. Consumed %d\n", | |
956 | consumed); | |
da32dd68 | 957 | break; |
a8ac6311 OK |
958 | } |
959 | BUG_ON(segment->copied >= segment->size); | |
da32dd68 OK |
960 | |
961 | debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail); | |
a8ac6311 | 962 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
da32dd68 OK |
963 | BUG_ON(rc == 0); |
964 | consumed += rc; | |
965 | ||
a8ac6311 OK |
966 | if (segment->total_copied >= segment->total_size) { |
967 | debug_tcp("segment done\n"); | |
968 | rc = segment->done(tcp_conn, segment); | |
da32dd68 OK |
969 | if (rc != 0) { |
970 | skb_abort_seq_read(&seq); | |
971 | goto error; | |
dbdb016d | 972 | } |
7ba24713 | 973 | |
da32dd68 | 974 | /* The done() functions sets up the |
a8ac6311 | 975 | * next segment. */ |
7ba24713 | 976 | } |
7ba24713 | 977 | } |
a8ac6311 | 978 | skb_abort_seq_read(&seq); |
da32dd68 OK |
979 | conn->rxdata_octets += consumed; |
980 | return consumed; | |
7ba24713 | 981 | |
da32dd68 OK |
982 | error: |
983 | debug_tcp("Error receiving PDU, errno=%d\n", rc); | |
984 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
985 | return 0; | |
7ba24713 AA |
986 | } |
987 | ||
988 | static void | |
989 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
990 | { | |
991 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 992 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
993 | read_descriptor_t rd_desc; |
994 | ||
995 | read_lock(&sk->sk_callback_lock); | |
996 | ||
665b44ae | 997 | /* |
da32dd68 | 998 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 999 | * We set count to 1 because we want the network layer to |
da32dd68 | 1000 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
1001 | * handled pdus that cross buffers or pdus that still need data. |
1002 | */ | |
7ba24713 | 1003 | rd_desc.arg.data = conn; |
665b44ae | 1004 | rd_desc.count = 1; |
da32dd68 | 1005 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv); |
7ba24713 AA |
1006 | |
1007 | read_unlock(&sk->sk_callback_lock); | |
da32dd68 OK |
1008 | |
1009 | /* If we had to (atomically) map a highmem page, | |
1010 | * unmap it now. */ | |
a8ac6311 | 1011 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7ba24713 AA |
1012 | } |
1013 | ||
1014 | static void | |
1015 | iscsi_tcp_state_change(struct sock *sk) | |
1016 | { | |
5bb0b55a | 1017 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1018 | struct iscsi_conn *conn; |
1019 | struct iscsi_session *session; | |
1020 | void (*old_state_change)(struct sock *); | |
1021 | ||
1022 | read_lock(&sk->sk_callback_lock); | |
1023 | ||
1024 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1025 | session = conn->session; | |
1026 | ||
e6273993 MC |
1027 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1028 | sk->sk_state == TCP_CLOSE) && | |
1029 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1030 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1031 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1032 | } | |
1033 | ||
5bb0b55a MC |
1034 | tcp_conn = conn->dd_data; |
1035 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1036 | |
1037 | read_unlock(&sk->sk_callback_lock); | |
1038 | ||
1039 | old_state_change(sk); | |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * iscsi_write_space - Called when more output buffer space is available | |
1044 | * @sk: socket space is available for | |
1045 | **/ | |
1046 | static void | |
1047 | iscsi_write_space(struct sock *sk) | |
1048 | { | |
1049 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1050 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1051 | ||
1052 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1053 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1054 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1055 | } |
1056 | ||
1057 | static void | |
1058 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1059 | { | |
5bb0b55a MC |
1060 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1061 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1062 | |
1063 | /* assign new callbacks */ | |
1064 | write_lock_bh(&sk->sk_callback_lock); | |
1065 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1066 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1067 | tcp_conn->old_state_change = sk->sk_state_change; | |
1068 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1069 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1070 | sk->sk_state_change = iscsi_tcp_state_change; | |
1071 | sk->sk_write_space = iscsi_write_space; | |
1072 | write_unlock_bh(&sk->sk_callback_lock); | |
1073 | } | |
1074 | ||
1075 | static void | |
1c83469d | 1076 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1077 | { |
5bb0b55a | 1078 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1079 | |
1080 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1081 | write_lock_bh(&sk->sk_callback_lock); | |
1082 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1083 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1084 | sk->sk_state_change = tcp_conn->old_state_change; | |
1085 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1086 | sk->sk_no_check = 0; |
1087 | write_unlock_bh(&sk->sk_callback_lock); | |
1088 | } | |
1089 | ||
1090 | /** | |
a8ac6311 OK |
1091 | * iscsi_xmit - TCP transmit |
1092 | **/ | |
1093 | static int | |
1094 | iscsi_xmit(struct iscsi_conn *conn) | |
7ba24713 | 1095 | { |
5bb0b55a | 1096 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
a8ac6311 OK |
1097 | struct iscsi_segment *segment = &tcp_conn->out.segment; |
1098 | unsigned int consumed = 0; | |
1099 | int rc = 0; | |
7ba24713 | 1100 | |
a8ac6311 OK |
1101 | while (1) { |
1102 | rc = iscsi_tcp_xmit_segment(tcp_conn, segment); | |
1103 | if (rc < 0) | |
1104 | goto error; | |
1105 | if (rc == 0) | |
1106 | break; | |
1107 | ||
1108 | consumed += rc; | |
1109 | ||
1110 | if (segment->total_copied >= segment->total_size) { | |
1111 | if (segment->done != NULL) { | |
1112 | rc = segment->done(tcp_conn, segment); | |
1113 | if (rc < 0) | |
1114 | goto error; | |
1115 | } | |
1116 | } | |
3219e529 MC |
1117 | } |
1118 | ||
a8ac6311 OK |
1119 | debug_tcp("xmit %d bytes\n", consumed); |
1120 | ||
1121 | conn->txdata_octets += consumed; | |
1122 | return consumed; | |
1123 | ||
1124 | error: | |
1125 | /* Transmit error. We could initiate error recovery | |
1126 | * here. */ | |
1127 | debug_tcp("Error sending PDU, errno=%d\n", rc); | |
1128 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1129 | return rc; | |
7ba24713 AA |
1130 | } |
1131 | ||
1132 | /** | |
a8ac6311 OK |
1133 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
1134 | */ | |
7ba24713 | 1135 | static inline int |
a8ac6311 | 1136 | iscsi_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 1137 | { |
a8ac6311 OK |
1138 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1139 | struct iscsi_segment *segment = &tcp_conn->out.segment; | |
7ba24713 | 1140 | |
a8ac6311 | 1141 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
1142 | } |
1143 | ||
7ba24713 | 1144 | static inline int |
a8ac6311 | 1145 | iscsi_tcp_flush(struct iscsi_conn *conn) |
7ba24713 | 1146 | { |
a8ac6311 OK |
1147 | int rc; |
1148 | ||
1149 | while (iscsi_tcp_xmit_qlen(conn)) { | |
1150 | rc = iscsi_xmit(conn); | |
1151 | if (rc == 0) | |
7ba24713 | 1152 | return -EAGAIN; |
a8ac6311 OK |
1153 | if (rc < 0) |
1154 | return rc; | |
3219e529 | 1155 | } |
7ba24713 | 1156 | |
a8ac6311 | 1157 | return 0; |
7ba24713 AA |
1158 | } |
1159 | ||
a8ac6311 OK |
1160 | /* |
1161 | * This is called when we're done sending the header. | |
1162 | * Simply copy the data_segment to the send segment, and return. | |
1163 | */ | |
1164 | static int | |
1165 | iscsi_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, | |
1166 | struct iscsi_segment *segment) | |
7ba24713 | 1167 | { |
a8ac6311 OK |
1168 | tcp_conn->out.segment = tcp_conn->out.data_segment; |
1169 | debug_tcp("Header done. Next segment size %u total_size %u\n", | |
1170 | tcp_conn->out.segment.size, tcp_conn->out.segment.total_size); | |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | static void | |
1175 | iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen) | |
1176 | { | |
1177 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1178 | ||
1179 | debug_tcp("%s(%p%s)\n", __FUNCTION__, tcp_conn, | |
1180 | conn->hdrdgst_en? ", digest enabled" : ""); | |
1181 | ||
1182 | /* Clear the data segment - needs to be filled in by the | |
1183 | * caller using iscsi_tcp_send_data_prep() */ | |
1184 | memset(&tcp_conn->out.data_segment, 0, sizeof(struct iscsi_segment)); | |
1185 | ||
1186 | /* If header digest is enabled, compute the CRC and | |
1187 | * place the digest into the same buffer. We make | |
1188 | * sure that both iscsi_tcp_ctask and mtask have | |
1189 | * sufficient room. | |
1190 | */ | |
1191 | if (conn->hdrdgst_en) { | |
1192 | iscsi_tcp_dgst_header(&tcp_conn->tx_hash, hdr, hdrlen, | |
1193 | hdr + hdrlen); | |
1194 | hdrlen += ISCSI_DIGEST_SIZE; | |
1195 | } | |
1196 | ||
1197 | /* Remember header pointer for later, when we need | |
1198 | * to decide whether there's a payload to go along | |
1199 | * with the header. */ | |
1200 | tcp_conn->out.hdr = hdr; | |
1201 | ||
1202 | iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen, | |
1203 | iscsi_tcp_send_hdr_done, NULL); | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Prepare the send buffer for the payload data. | |
1208 | * Padding and checksumming will all be taken care | |
1209 | * of by the iscsi_segment routines. | |
1210 | */ | |
1211 | static int | |
1212 | iscsi_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, | |
1213 | unsigned int count, unsigned int offset, | |
1214 | unsigned int len) | |
1215 | { | |
1216 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1217 | struct hash_desc *tx_hash = NULL; | |
1218 | unsigned int hdr_spec_len; | |
1219 | ||
1220 | debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __FUNCTION__, | |
1221 | tcp_conn, offset, len, | |
1222 | conn->datadgst_en? ", digest enabled" : ""); | |
1223 | ||
1224 | /* Make sure the datalen matches what the caller | |
1225 | said he would send. */ | |
1226 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1227 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1228 | ||
1229 | if (conn->datadgst_en) | |
1230 | tx_hash = &tcp_conn->tx_hash; | |
1231 | ||
1232 | return iscsi_segment_seek_sg(&tcp_conn->out.data_segment, | |
1233 | sg, count, offset, len, | |
1234 | NULL, tx_hash); | |
1235 | } | |
1236 | ||
1237 | static void | |
1238 | iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data, | |
1239 | size_t len) | |
1240 | { | |
1241 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1242 | struct hash_desc *tx_hash = NULL; | |
1243 | unsigned int hdr_spec_len; | |
1244 | ||
1245 | debug_tcp("%s(%p, datalen=%d%s)\n", __FUNCTION__, tcp_conn, len, | |
1246 | conn->datadgst_en? ", digest enabled" : ""); | |
1247 | ||
1248 | /* Make sure the datalen matches what the caller | |
1249 | said he would send. */ | |
1250 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1251 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1252 | ||
1253 | if (conn->datadgst_en) | |
1254 | tx_hash = &tcp_conn->tx_hash; | |
1255 | ||
1256 | iscsi_segment_init_linear(&tcp_conn->out.data_segment, | |
1257 | data, len, NULL, tx_hash); | |
7ba24713 AA |
1258 | } |
1259 | ||
7ba24713 AA |
1260 | /** |
1261 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1262 | * @conn: iscsi connection | |
1263 | * @ctask: scsi command task | |
1264 | * @r2t: R2T info | |
1265 | * @left: bytes left to transfer | |
1266 | * | |
1267 | * Notes: | |
1268 | * Initialize next Data-Out within this R2T sequence and continue | |
1269 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1270 | * | |
1271 | * Called under connection lock. | |
1272 | **/ | |
a8ac6311 | 1273 | static int |
7ba24713 | 1274 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
a8ac6311 | 1275 | struct iscsi_r2t_info *r2t) |
7ba24713 AA |
1276 | { |
1277 | struct iscsi_data *hdr; | |
a8ac6311 OK |
1278 | int new_offset, left; |
1279 | ||
1280 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1281 | left = r2t->data_length - r2t->sent; | |
1282 | if (left == 0) | |
1283 | return 0; | |
7ba24713 | 1284 | |
ffbfe925 | 1285 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1286 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1287 | hdr->ttt = r2t->ttt; | |
1288 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1289 | r2t->solicit_datasn++; | |
1290 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1291 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1292 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1293 | hdr->exp_statsn = r2t->exp_statsn; |
1294 | new_offset = r2t->data_offset + r2t->sent; | |
1295 | hdr->offset = cpu_to_be32(new_offset); | |
1296 | if (left > conn->max_xmit_dlength) { | |
1297 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1298 | r2t->data_count = conn->max_xmit_dlength; | |
1299 | } else { | |
1300 | hton24(hdr->dlength, left); | |
1301 | r2t->data_count = left; | |
1302 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1303 | } | |
7ba24713 | 1304 | |
a8ac6311 OK |
1305 | conn->dataout_pdus_cnt++; |
1306 | return 1; | |
7ba24713 AA |
1307 | } |
1308 | ||
1309 | /** | |
a8ac6311 | 1310 | * iscsi_tcp_ctask - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1311 | * @conn: iscsi connection |
1312 | * @ctask: scsi command task | |
1313 | * @sc: scsi command | |
1314 | **/ | |
a8ac6311 OK |
1315 | static int |
1316 | iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask) | |
7ba24713 | 1317 | { |
5bb0b55a | 1318 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
a8ac6311 OK |
1319 | struct iscsi_conn *conn = ctask->conn; |
1320 | struct scsi_cmnd *sc = ctask->sc; | |
1321 | int err; | |
7ba24713 | 1322 | |
5bb0b55a | 1323 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
a8ac6311 OK |
1324 | tcp_ctask->sent = 0; |
1325 | tcp_ctask->exp_datasn = 0; | |
1326 | ||
1327 | /* Prepare PDU, optionally w/ immediate data */ | |
1328 | debug_scsi("ctask deq [cid %d itt 0x%x imm %d unsol %d]\n", | |
1329 | conn->id, ctask->itt, ctask->imm_count, | |
1330 | ctask->unsol_count); | |
1331 | iscsi_tcp_send_hdr_prep(conn, ctask->hdr, ctask->hdr_len); | |
1332 | ||
1333 | if (!ctask->imm_count) | |
1334 | return 0; | |
1335 | ||
1336 | /* If we have immediate data, attach a payload */ | |
94795b61 BH |
1337 | err = iscsi_tcp_send_data_prep(conn, scsi_out(sc)->table.sgl, |
1338 | scsi_out(sc)->table.nents, | |
a8ac6311 OK |
1339 | 0, ctask->imm_count); |
1340 | if (err) | |
1341 | return err; | |
1342 | tcp_ctask->sent += ctask->imm_count; | |
1343 | ctask->imm_count = 0; | |
1344 | return 0; | |
7ba24713 AA |
1345 | } |
1346 | ||
1347 | /** | |
5bb0b55a | 1348 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1349 | * @conn: iscsi connection |
1350 | * @mtask: task management task | |
1351 | * | |
1352 | * Notes: | |
1353 | * The function can return -EAGAIN in which case caller must | |
1354 | * call it again later, or recover. '0' return code means successful | |
1355 | * xmit. | |
7ba24713 AA |
1356 | **/ |
1357 | static int | |
5bb0b55a | 1358 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1359 | { |
3219e529 | 1360 | int rc; |
7ba24713 | 1361 | |
a8ac6311 OK |
1362 | /* Flush any pending data first. */ |
1363 | rc = iscsi_tcp_flush(conn); | |
1364 | if (rc < 0) | |
1365 | return rc; | |
7ba24713 | 1366 | |
b4377356 | 1367 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1368 | struct iscsi_session *session = conn->session; |
1369 | ||
1370 | spin_lock_bh(&session->lock); | |
b3a7ea8d | 1371 | iscsi_free_mgmt_task(conn, mtask); |
5bb0b55a MC |
1372 | spin_unlock_bh(&session->lock); |
1373 | } | |
a8ac6311 | 1374 | |
7ba24713 AA |
1375 | return 0; |
1376 | } | |
1377 | ||
a8ac6311 OK |
1378 | /* |
1379 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1380 | * @conn: iscsi connection | |
1381 | * @ctask: iscsi command task | |
1382 | * | |
1383 | * We're expected to return 0 when everything was transmitted succesfully, | |
1384 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind | |
1385 | * of error. | |
1386 | */ | |
218432c6 | 1387 | static int |
a8ac6311 | 1388 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1389 | { |
218432c6 | 1390 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
a8ac6311 | 1391 | struct scsi_cmnd *sc = ctask->sc; |
94795b61 | 1392 | struct scsi_data_buffer *sdb = scsi_out(sc); |
218432c6 | 1393 | int rc = 0; |
3219e529 | 1394 | |
a8ac6311 OK |
1395 | flush: |
1396 | /* Flush any pending data first. */ | |
1397 | rc = iscsi_tcp_flush(conn); | |
1398 | if (rc < 0) | |
62f38300 MC |
1399 | return rc; |
1400 | ||
a8ac6311 OK |
1401 | /* Are we done already? */ |
1402 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1403 | return 0; | |
7ba24713 | 1404 | |
a8ac6311 OK |
1405 | if (ctask->unsol_count != 0) { |
1406 | struct iscsi_data *hdr = &tcp_ctask->unsol_dtask.hdr; | |
dd8c0d95 | 1407 | |
a8ac6311 OK |
1408 | /* Prepare a header for the unsolicited PDU. |
1409 | * The amount of data we want to send will be | |
1410 | * in ctask->data_count. | |
1411 | * FIXME: return the data count instead. | |
1412 | */ | |
1413 | iscsi_prep_unsolicit_data_pdu(ctask, hdr); | |
7ba24713 | 1414 | |
a8ac6311 OK |
1415 | debug_tcp("unsol dout [itt 0x%x doff %d dlen %d]\n", |
1416 | ctask->itt, tcp_ctask->sent, ctask->data_count); | |
7ba24713 | 1417 | |
a8ac6311 | 1418 | iscsi_tcp_send_hdr_prep(conn, hdr, sizeof(*hdr)); |
94795b61 BH |
1419 | rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl, |
1420 | sdb->table.nents, tcp_ctask->sent, | |
a8ac6311 | 1421 | ctask->data_count); |
62f38300 | 1422 | if (rc) |
a8ac6311 OK |
1423 | goto fail; |
1424 | tcp_ctask->sent += ctask->data_count; | |
1425 | ctask->unsol_count -= ctask->data_count; | |
1426 | goto flush; | |
1427 | } else { | |
1428 | struct iscsi_session *session = conn->session; | |
1429 | struct iscsi_r2t_info *r2t; | |
7ba24713 | 1430 | |
a8ac6311 | 1431 | /* All unsolicited PDUs sent. Check for solicited PDUs. |
7ba24713 | 1432 | */ |
a8ac6311 OK |
1433 | spin_lock_bh(&session->lock); |
1434 | r2t = tcp_ctask->r2t; | |
1435 | if (r2t != NULL) { | |
1436 | /* Continue with this R2T? */ | |
1437 | if (!iscsi_solicit_data_cont(conn, ctask, r2t)) { | |
1438 | debug_scsi(" done with r2t %p\n", r2t); | |
1439 | ||
1440 | __kfifo_put(tcp_ctask->r2tpool.queue, | |
1441 | (void*)&r2t, sizeof(void*)); | |
1442 | tcp_ctask->r2t = r2t = NULL; | |
1443 | } | |
7ba24713 | 1444 | } |
7ba24713 | 1445 | |
a8ac6311 | 1446 | if (r2t == NULL) { |
62f38300 MC |
1447 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1448 | sizeof(void*)); | |
a8ac6311 | 1449 | r2t = tcp_ctask->r2t; |
db37c505 | 1450 | } |
a8ac6311 | 1451 | spin_unlock_bh(&session->lock); |
7ba24713 | 1452 | |
a8ac6311 OK |
1453 | /* Waiting for more R2Ts to arrive. */ |
1454 | if (r2t == NULL) { | |
1455 | debug_tcp("no R2Ts yet\n"); | |
1456 | return 0; | |
7ba24713 | 1457 | } |
7ba24713 | 1458 | |
a8ac6311 OK |
1459 | debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1460 | r2t, r2t->solicit_datasn - 1, ctask->itt, | |
1461 | r2t->data_offset + r2t->sent, r2t->data_count); | |
7ba24713 | 1462 | |
a8ac6311 OK |
1463 | iscsi_tcp_send_hdr_prep(conn, &r2t->dtask.hdr, |
1464 | sizeof(struct iscsi_hdr)); | |
7ba24713 | 1465 | |
94795b61 BH |
1466 | rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl, |
1467 | sdb->table.nents, | |
a8ac6311 OK |
1468 | r2t->data_offset + r2t->sent, |
1469 | r2t->data_count); | |
62f38300 | 1470 | if (rc) |
a8ac6311 OK |
1471 | goto fail; |
1472 | tcp_ctask->sent += r2t->data_count; | |
1473 | r2t->sent += r2t->data_count; | |
1474 | goto flush; | |
7ba24713 | 1475 | } |
7ba24713 | 1476 | return 0; |
a8ac6311 OK |
1477 | fail: |
1478 | iscsi_conn_failure(conn, rc); | |
1479 | return -EIO; | |
7ba24713 AA |
1480 | } |
1481 | ||
5bb0b55a MC |
1482 | static struct iscsi_cls_conn * |
1483 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1484 | { |
5bb0b55a MC |
1485 | struct iscsi_conn *conn; |
1486 | struct iscsi_cls_conn *cls_conn; | |
1487 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1488 | |
5bb0b55a MC |
1489 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1490 | if (!cls_conn) | |
1491 | return NULL; | |
1492 | conn = cls_conn->dd_data; | |
7ba24713 | 1493 | /* |
5bb0b55a MC |
1494 | * due to strange issues with iser these are not set |
1495 | * in iscsi_conn_setup | |
7ba24713 | 1496 | */ |
bf32ed33 | 1497 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1498 | |
5bb0b55a MC |
1499 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1500 | if (!tcp_conn) | |
1501 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1502 | |
5bb0b55a MC |
1503 | conn->dd_data = tcp_conn; |
1504 | tcp_conn->iscsi_conn = conn; | |
7ba24713 | 1505 | |
c9802cd9 JB |
1506 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1507 | CRYPTO_ALG_ASYNC); | |
1508 | tcp_conn->tx_hash.flags = 0; | |
322d739d | 1509 | if (IS_ERR(tcp_conn->tx_hash.tfm)) |
dd8c0d95 MC |
1510 | goto free_tcp_conn; |
1511 | ||
c9802cd9 JB |
1512 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1513 | CRYPTO_ALG_ASYNC); | |
1514 | tcp_conn->rx_hash.flags = 0; | |
322d739d | 1515 | if (IS_ERR(tcp_conn->rx_hash.tfm)) |
dd8c0d95 MC |
1516 | goto free_tx_tfm; |
1517 | ||
5bb0b55a | 1518 | return cls_conn; |
7ba24713 | 1519 | |
dd8c0d95 | 1520 | free_tx_tfm: |
c9802cd9 | 1521 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 | 1522 | free_tcp_conn: |
322d739d MC |
1523 | iscsi_conn_printk(KERN_ERR, conn, |
1524 | "Could not create connection due to crc32c " | |
1525 | "loading error. Make sure the crc32c " | |
1526 | "module is built as a module or into the " | |
1527 | "kernel\n"); | |
dd8c0d95 | 1528 | kfree(tcp_conn); |
5bb0b55a MC |
1529 | tcp_conn_alloc_fail: |
1530 | iscsi_conn_teardown(cls_conn); | |
1531 | return NULL; | |
7ba24713 AA |
1532 | } |
1533 | ||
1c83469d MC |
1534 | static void |
1535 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1536 | { | |
22236961 | 1537 | struct iscsi_session *session = conn->session; |
1c83469d | 1538 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
22236961 | 1539 | struct socket *sock = tcp_conn->sock; |
1c83469d | 1540 | |
22236961 | 1541 | if (!sock) |
1c83469d MC |
1542 | return; |
1543 | ||
22236961 | 1544 | sock_hold(sock->sk); |
1c83469d | 1545 | iscsi_conn_restore_callbacks(tcp_conn); |
22236961 | 1546 | sock_put(sock->sk); |
1c83469d | 1547 | |
22236961 | 1548 | spin_lock_bh(&session->lock); |
1c83469d MC |
1549 | tcp_conn->sock = NULL; |
1550 | conn->recv_lock = NULL; | |
22236961 MC |
1551 | spin_unlock_bh(&session->lock); |
1552 | sockfd_put(sock); | |
1c83469d MC |
1553 | } |
1554 | ||
7ba24713 | 1555 | static void |
5bb0b55a | 1556 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1557 | { |
5bb0b55a MC |
1558 | struct iscsi_conn *conn = cls_conn->dd_data; |
1559 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1560 | |
1c83469d | 1561 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1562 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1563 | |
534284a0 PW |
1564 | if (tcp_conn->tx_hash.tfm) |
1565 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1566 | if (tcp_conn->rx_hash.tfm) | |
1567 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1568 | |
5bb0b55a MC |
1569 | kfree(tcp_conn); |
1570 | } | |
7ba24713 | 1571 | |
1c83469d MC |
1572 | static void |
1573 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1574 | { | |
1575 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1576 | ||
1577 | iscsi_conn_stop(cls_conn, flag); | |
1578 | iscsi_tcp_release_conn(conn); | |
1579 | } | |
1580 | ||
22236961 MC |
1581 | static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
1582 | char *buf, int *port, | |
1583 | int (*getname)(struct socket *, struct sockaddr *, | |
1584 | int *addrlen)) | |
1585 | { | |
1586 | struct sockaddr_storage *addr; | |
1587 | struct sockaddr_in6 *sin6; | |
1588 | struct sockaddr_in *sin; | |
1589 | int rc = 0, len; | |
1590 | ||
a9204879 | 1591 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
1592 | if (!addr) |
1593 | return -ENOMEM; | |
1594 | ||
1595 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
1596 | rc = -ENODEV; | |
1597 | goto free_addr; | |
1598 | } | |
1599 | ||
1600 | switch (addr->ss_family) { | |
1601 | case AF_INET: | |
1602 | sin = (struct sockaddr_in *)addr; | |
1603 | spin_lock_bh(&conn->session->lock); | |
1604 | sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); | |
1605 | *port = be16_to_cpu(sin->sin_port); | |
1606 | spin_unlock_bh(&conn->session->lock); | |
1607 | break; | |
1608 | case AF_INET6: | |
1609 | sin6 = (struct sockaddr_in6 *)addr; | |
1610 | spin_lock_bh(&conn->session->lock); | |
1611 | sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr)); | |
1612 | *port = be16_to_cpu(sin6->sin6_port); | |
1613 | spin_unlock_bh(&conn->session->lock); | |
1614 | break; | |
1615 | } | |
1616 | free_addr: | |
1617 | kfree(addr); | |
1618 | return rc; | |
1619 | } | |
1620 | ||
5bb0b55a MC |
1621 | static int |
1622 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1623 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1624 | int is_leading) |
1625 | { | |
1626 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1627 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1628 | struct sock *sk; | |
1629 | struct socket *sock; | |
1630 | int err; | |
7ba24713 | 1631 | |
5bb0b55a | 1632 | /* lookup for existing socket */ |
264faaaa | 1633 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 1634 | if (!sock) { |
322d739d MC |
1635 | iscsi_conn_printk(KERN_ERR, conn, |
1636 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 1637 | return -EEXIST; |
7ba24713 | 1638 | } |
22236961 MC |
1639 | /* |
1640 | * copy these values now because if we drop the session | |
1641 | * userspace may still want to query the values since we will | |
1642 | * be using them for the reconnect | |
1643 | */ | |
1644 | err = iscsi_tcp_get_addr(conn, sock, conn->portal_address, | |
1645 | &conn->portal_port, kernel_getpeername); | |
1646 | if (err) | |
1647 | goto free_socket; | |
1648 | ||
1649 | err = iscsi_tcp_get_addr(conn, sock, conn->local_address, | |
1650 | &conn->local_port, kernel_getsockname); | |
1651 | if (err) | |
1652 | goto free_socket; | |
7ba24713 | 1653 | |
5bb0b55a MC |
1654 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1655 | if (err) | |
22236961 | 1656 | goto free_socket; |
7ba24713 | 1657 | |
67a61114 MC |
1658 | /* bind iSCSI connection and socket */ |
1659 | tcp_conn->sock = sock; | |
7ba24713 | 1660 | |
67a61114 MC |
1661 | /* setup Socket parameters */ |
1662 | sk = sock->sk; | |
1663 | sk->sk_reuse = 1; | |
1664 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1665 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1666 | |
67a61114 | 1667 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1668 | |
67a61114 MC |
1669 | /* |
1670 | * Intercept TCP callbacks for sendfile like receive | |
1671 | * processing. | |
1672 | */ | |
1673 | conn->recv_lock = &sk->sk_callback_lock; | |
1674 | iscsi_conn_set_callbacks(conn); | |
1675 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1676 | /* | |
1677 | * set receive state machine into initial state | |
1678 | */ | |
da32dd68 | 1679 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 1680 | return 0; |
22236961 MC |
1681 | |
1682 | free_socket: | |
1683 | sockfd_put(sock); | |
1684 | return err; | |
7ba24713 AA |
1685 | } |
1686 | ||
5bb0b55a | 1687 | /* called with host lock */ |
30a6c652 | 1688 | static void |
a8ac6311 | 1689 | iscsi_tcp_mtask_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1690 | { |
a8ac6311 OK |
1691 | debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); |
1692 | ||
1693 | /* Prepare PDU, optionally w/ immediate data */ | |
1694 | iscsi_tcp_send_hdr_prep(conn, mtask->hdr, sizeof(*mtask->hdr)); | |
1695 | ||
1696 | /* If we have immediate data, attach a payload */ | |
1697 | if (mtask->data_count) | |
1698 | iscsi_tcp_send_linear_data_prepare(conn, mtask->data, | |
1699 | mtask->data_count); | |
7ba24713 AA |
1700 | } |
1701 | ||
1702 | static int | |
1703 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1704 | { | |
1705 | int i; | |
1706 | int cmd_i; | |
1707 | ||
1708 | /* | |
1709 | * initialize per-task: R2T pool and xmit queue | |
1710 | */ | |
1711 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1712 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 1713 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1714 | |
1715 | /* | |
1716 | * pre-allocated x4 as much r2ts to handle race when | |
1717 | * target acks DataOut faster than we data_xmit() queues | |
1718 | * could replenish r2tqueue. | |
1719 | */ | |
1720 | ||
1721 | /* R2T pool */ | |
6320377f | 1722 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, NULL, |
5bb0b55a | 1723 | sizeof(struct iscsi_r2t_info))) { |
7ba24713 AA |
1724 | goto r2t_alloc_fail; |
1725 | } | |
1726 | ||
1727 | /* R2T xmit queue */ | |
5bb0b55a | 1728 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 1729 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a | 1730 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
6320377f | 1731 | iscsi_pool_free(&tcp_ctask->r2tpool); |
7ba24713 AA |
1732 | goto r2t_alloc_fail; |
1733 | } | |
7ba24713 AA |
1734 | } |
1735 | ||
1736 | return 0; | |
1737 | ||
1738 | r2t_alloc_fail: | |
1739 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
1740 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
1741 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1742 | ||
5bb0b55a | 1743 | kfifo_free(tcp_ctask->r2tqueue); |
6320377f | 1744 | iscsi_pool_free(&tcp_ctask->r2tpool); |
7ba24713 AA |
1745 | } |
1746 | return -ENOMEM; | |
1747 | } | |
1748 | ||
1749 | static void | |
1750 | iscsi_r2tpool_free(struct iscsi_session *session) | |
1751 | { | |
1752 | int i; | |
1753 | ||
1754 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
1755 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
1756 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1757 | |
5bb0b55a | 1758 | kfifo_free(tcp_ctask->r2tqueue); |
6320377f | 1759 | iscsi_pool_free(&tcp_ctask->r2tpool); |
7ba24713 | 1760 | } |
7ba24713 AA |
1761 | } |
1762 | ||
1763 | static int | |
7b7232f3 | 1764 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 1765 | char *buf, int buflen) |
7ba24713 | 1766 | { |
7b7232f3 | 1767 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 1768 | struct iscsi_session *session = conn->session; |
5bb0b55a | 1769 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 1770 | int value; |
7ba24713 | 1771 | |
7ba24713 | 1772 | switch(param) { |
7ba24713 | 1773 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 1774 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1775 | break; |
1776 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 1777 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
1778 | tcp_conn->sendpage = conn->datadgst_en ? |
1779 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 1780 | break; |
7ba24713 | 1781 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 1782 | sscanf(buf, "%d", &value); |
df93ffcd MC |
1783 | if (value <= 0 || !is_power_of_2(value)) |
1784 | return -EINVAL; | |
1785 | if (session->max_r2t == value) | |
7ba24713 AA |
1786 | break; |
1787 | iscsi_r2tpool_free(session); | |
5c75b7fc | 1788 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1789 | if (iscsi_r2tpool_alloc(session)) |
1790 | return -ENOMEM; | |
1791 | break; | |
7ba24713 | 1792 | default: |
5c75b7fc | 1793 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
1794 | } |
1795 | ||
1796 | return 0; | |
1797 | } | |
1798 | ||
1799 | static int | |
5c75b7fc MC |
1800 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
1801 | enum iscsi_param param, char *buf) | |
7b8631b5 | 1802 | { |
7b7232f3 | 1803 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 1804 | int len; |
7b8631b5 MC |
1805 | |
1806 | switch(param) { | |
fd7255f5 | 1807 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
1808 | spin_lock_bh(&conn->session->lock); |
1809 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
1810 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 1811 | break; |
fd7255f5 | 1812 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
1813 | spin_lock_bh(&conn->session->lock); |
1814 | len = sprintf(buf, "%s\n", conn->portal_address); | |
1815 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
1816 | break; |
1817 | default: | |
5c75b7fc | 1818 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
1819 | } |
1820 | ||
1821 | return len; | |
1822 | } | |
1823 | ||
22236961 MC |
1824 | static int |
1825 | iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
1826 | char *buf) | |
1827 | { | |
1828 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1829 | int len; | |
1830 | ||
1831 | switch (param) { | |
1832 | case ISCSI_HOST_PARAM_IPADDRESS: | |
1833 | spin_lock_bh(&session->lock); | |
1834 | if (!session->leadconn) | |
1835 | len = -ENODEV; | |
1836 | else | |
1837 | len = sprintf(buf, "%s\n", | |
1838 | session->leadconn->local_address); | |
1839 | spin_unlock_bh(&session->lock); | |
1840 | break; | |
1841 | default: | |
1842 | return iscsi_host_get_param(shost, param, buf); | |
1843 | } | |
1844 | return len; | |
1845 | } | |
1846 | ||
7ba24713 | 1847 | static void |
7b7232f3 | 1848 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 1849 | { |
7b7232f3 | 1850 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 1851 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
1852 | |
1853 | stats->txdata_octets = conn->txdata_octets; | |
1854 | stats->rxdata_octets = conn->rxdata_octets; | |
1855 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1856 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1857 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1858 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1859 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1860 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1861 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1862 | stats->custom_length = 3; | |
1863 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 1864 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 1865 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 1866 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
1867 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
1868 | stats->custom[2].value = conn->eh_abort_cnt; | |
1869 | } | |
1870 | ||
5bb0b55a MC |
1871 | static struct iscsi_cls_session * |
1872 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
1873 | struct scsi_transport_template *scsit, | |
1548271e | 1874 | uint16_t cmds_max, uint16_t qdepth, |
5bb0b55a | 1875 | uint32_t initial_cmdsn, uint32_t *hostno) |
7ba24713 | 1876 | { |
5bb0b55a MC |
1877 | struct iscsi_cls_session *cls_session; |
1878 | struct iscsi_session *session; | |
1879 | uint32_t hn; | |
1880 | int cmd_i; | |
7ba24713 | 1881 | |
1548271e | 1882 | cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth, |
5bb0b55a MC |
1883 | sizeof(struct iscsi_tcp_cmd_task), |
1884 | sizeof(struct iscsi_tcp_mgmt_task), | |
1885 | initial_cmdsn, &hn); | |
1886 | if (!cls_session) | |
1887 | return NULL; | |
1888 | *hostno = hn; | |
7ba24713 | 1889 | |
5bb0b55a MC |
1890 | session = class_to_transport_session(cls_session); |
1891 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1892 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1893 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1894 | ||
004d6530 BH |
1895 | ctask->hdr = &tcp_ctask->hdr.cmd_hdr; |
1896 | ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE; | |
5bb0b55a MC |
1897 | } |
1898 | ||
1899 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1900 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1901 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
1902 | ||
a8ac6311 | 1903 | mtask->hdr = (struct iscsi_hdr *) &tcp_mtask->hdr; |
5bb0b55a MC |
1904 | } |
1905 | ||
1906 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
1907 | goto r2tpool_alloc_fail; | |
1908 | ||
1909 | return cls_session; | |
1910 | ||
1911 | r2tpool_alloc_fail: | |
1912 | iscsi_session_teardown(cls_session); | |
1913 | return NULL; | |
1914 | } | |
1915 | ||
1916 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
1917 | { | |
5bb0b55a MC |
1918 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
1919 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
1920 | } |
1921 | ||
d1d81c01 MC |
1922 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) |
1923 | { | |
b6d44fe9 | 1924 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
1925 | blk_queue_dma_alignment(sdev->request_queue, 0); |
1926 | return 0; | |
1927 | } | |
1928 | ||
5bb0b55a | 1929 | static struct scsi_host_template iscsi_sht = { |
7974392c | 1930 | .module = THIS_MODULE, |
f4246b33 | 1931 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
1932 | .queuecommand = iscsi_queuecommand, |
1933 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 1934 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 1935 | .sg_tablesize = 4096, |
8231f0ed | 1936 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
1937 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
1938 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 1939 | .eh_device_reset_handler= iscsi_eh_device_reset, |
5bb0b55a MC |
1940 | .eh_host_reset_handler = iscsi_eh_host_reset, |
1941 | .use_clustering = DISABLE_CLUSTERING, | |
d1d81c01 | 1942 | .slave_configure = iscsi_tcp_slave_configure, |
5bb0b55a MC |
1943 | .proc_name = "iscsi_tcp", |
1944 | .this_id = -1, | |
1945 | }; | |
1946 | ||
7ba24713 AA |
1947 | static struct iscsi_transport iscsi_tcp_transport = { |
1948 | .owner = THIS_MODULE, | |
1949 | .name = "tcp", | |
1950 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1951 | | CAP_DATADGST, | |
fd7255f5 MC |
1952 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
1953 | ISCSI_MAX_XMIT_DLENGTH | | |
1954 | ISCSI_HDRDGST_EN | | |
1955 | ISCSI_DATADGST_EN | | |
1956 | ISCSI_INITIAL_R2T_EN | | |
1957 | ISCSI_MAX_R2T | | |
1958 | ISCSI_IMM_DATA_EN | | |
1959 | ISCSI_FIRST_BURST | | |
1960 | ISCSI_MAX_BURST | | |
1961 | ISCSI_PDU_INORDER_EN | | |
1962 | ISCSI_DATASEQ_INORDER_EN | | |
1963 | ISCSI_ERL | | |
1964 | ISCSI_CONN_PORT | | |
8d2860b3 | 1965 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
1966 | ISCSI_EXP_STATSN | |
1967 | ISCSI_PERSISTENT_PORT | | |
1968 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
1969 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
1970 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a | 1971 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
f6d5180c MC |
1972 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | |
1973 | ISCSI_LU_RESET_TMO | | |
1974 | ISCSI_PING_TMO | ISCSI_RECV_TMO, | |
22236961 | 1975 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
1976 | ISCSI_HOST_INITIATOR_NAME | |
1977 | ISCSI_HOST_NETDEV_NAME, | |
7ba24713 | 1978 | .host_template = &iscsi_sht, |
7b8631b5 | 1979 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 | 1980 | .max_conn = 1, |
66bbe0ce | 1981 | .max_cmd_len = 16, |
5bb0b55a MC |
1982 | /* session management */ |
1983 | .create_session = iscsi_tcp_session_create, | |
1984 | .destroy_session = iscsi_tcp_session_destroy, | |
1985 | /* connection management */ | |
1986 | .create_conn = iscsi_tcp_conn_create, | |
1987 | .bind_conn = iscsi_tcp_conn_bind, | |
1988 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 1989 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 1990 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 1991 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1992 | .start_conn = iscsi_conn_start, |
1c83469d | 1993 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 | 1994 | /* iscsi host params */ |
22236961 | 1995 | .get_host_param = iscsi_tcp_host_get_param, |
0801c242 | 1996 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1997 | /* IO */ |
7ba24713 AA |
1998 | .send_pdu = iscsi_conn_send_pdu, |
1999 | .get_stats = iscsi_conn_get_stats, | |
a8ac6311 OK |
2000 | .init_cmd_task = iscsi_tcp_ctask_init, |
2001 | .init_mgmt_task = iscsi_tcp_mtask_init, | |
5bb0b55a MC |
2002 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, |
2003 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2004 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2005 | /* recovery */ | |
30a6c652 | 2006 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2007 | }; |
2008 | ||
2009 | static int __init | |
2010 | iscsi_tcp_init(void) | |
2011 | { | |
7ba24713 | 2012 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2013 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2014 | iscsi_max_lun); | |
7ba24713 AA |
2015 | return -EINVAL; |
2016 | } | |
2017 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2018 | ||
7b8631b5 | 2019 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2020 | return -ENODEV; |
7ba24713 | 2021 | |
7b8631b5 | 2022 | return 0; |
7ba24713 AA |
2023 | } |
2024 | ||
2025 | static void __exit | |
2026 | iscsi_tcp_exit(void) | |
2027 | { | |
2028 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2029 | } |
2030 | ||
2031 | module_init(iscsi_tcp_init); | |
2032 | module_exit(iscsi_tcp_exit); |