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1 | /* | |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
6 | * Copyright (C) 2005 - 2006 Mike Christie | |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
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> | |
32 | #include <linux/file.h> | |
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> | |
40 | #include <scsi/scsi_device.h> | |
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"); | |
51 | #undef DEBUG_TCP | |
52 | #define DEBUG_ASSERT | |
53 | ||
54 | #ifdef DEBUG_TCP | |
55 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) | |
56 | #else | |
57 | #define debug_tcp(fmt...) | |
58 | #endif | |
59 | ||
60 | #ifndef DEBUG_ASSERT | |
61 | #ifdef BUG_ON | |
62 | #undef BUG_ON | |
63 | #endif | |
64 | #define BUG_ON(expr) | |
65 | #endif | |
66 | ||
67 | static struct scsi_transport_template *iscsi_tcp_scsi_transport; | |
68 | static struct scsi_host_template iscsi_sht; | |
69 | static struct iscsi_transport iscsi_tcp_transport; | |
70 | ||
71 | static unsigned int iscsi_max_lun = 512; | |
72 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
73 | ||
74 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
75 | struct iscsi_segment *segment); | |
76 | ||
77 | /* | |
78 | * Scatterlist handling: inside the iscsi_segment, we | |
79 | * remember an index into the scatterlist, and set data/size | |
80 | * to the current scatterlist entry. For highmem pages, we | |
81 | * kmap as needed. | |
82 | * | |
83 | * Note that the page is unmapped when we return from | |
84 | * TCP's data_ready handler, so we may end up mapping and | |
85 | * unmapping the same page repeatedly. The whole reason | |
86 | * for this is that we shouldn't keep the page mapped | |
87 | * outside the softirq. | |
88 | */ | |
89 | ||
90 | /** | |
91 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry | |
92 | * @segment: the buffer object | |
93 | * @sg: scatterlist | |
94 | * @offset: byte offset into that sg entry | |
95 | * | |
96 | * This function sets up the segment so that subsequent | |
97 | * data is copied to the indicated sg entry, at the given | |
98 | * offset. | |
99 | */ | |
100 | static inline void | |
101 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, | |
102 | struct scatterlist *sg, unsigned int offset) | |
103 | { | |
104 | segment->sg = sg; | |
105 | segment->sg_offset = offset; | |
106 | segment->size = min(sg->length - offset, | |
107 | segment->total_size - segment->total_copied); | |
108 | segment->data = NULL; | |
109 | } | |
110 | ||
111 | /** | |
112 | * iscsi_tcp_segment_map - map the current S/G page | |
113 | * @segment: iscsi_segment | |
114 | * @recv: 1 if called from recv path | |
115 | * | |
116 | * We only need to possibly kmap data if scatter lists are being used, | |
117 | * because the iscsi passthrough and internal IO paths will never use high | |
118 | * mem pages. | |
119 | */ | |
120 | static inline void | |
121 | iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) | |
122 | { | |
123 | struct scatterlist *sg; | |
124 | ||
125 | if (segment->data != NULL || !segment->sg) | |
126 | return; | |
127 | ||
128 | sg = segment->sg; | |
129 | BUG_ON(segment->sg_mapped); | |
130 | BUG_ON(sg->length == 0); | |
131 | ||
132 | /* | |
133 | * If the page count is greater than one it is ok to send | |
134 | * to the network layer's zero copy send path. If not we | |
135 | * have to go the slow sendmsg path. We always map for the | |
136 | * recv path. | |
137 | */ | |
138 | if (page_count(sg_page(sg)) >= 1 && !recv) | |
139 | return; | |
140 | ||
141 | debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit", | |
142 | segment); | |
143 | segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0); | |
144 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; | |
145 | } | |
146 | ||
147 | static inline void | |
148 | iscsi_tcp_segment_unmap(struct iscsi_segment *segment) | |
149 | { | |
150 | debug_tcp("iscsi_tcp_segment_unmap %p\n", segment); | |
151 | ||
152 | if (segment->sg_mapped) { | |
153 | debug_tcp("iscsi_tcp_segment_unmap valid\n"); | |
154 | kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0); | |
155 | segment->sg_mapped = NULL; | |
156 | segment->data = NULL; | |
157 | } | |
158 | } | |
159 | ||
160 | /* | |
161 | * Splice the digest buffer into the buffer | |
162 | */ | |
163 | static inline void | |
164 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) | |
165 | { | |
166 | segment->data = digest; | |
167 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
168 | segment->total_size += ISCSI_DIGEST_SIZE; | |
169 | segment->size = ISCSI_DIGEST_SIZE; | |
170 | segment->copied = 0; | |
171 | segment->sg = NULL; | |
172 | segment->hash = NULL; | |
173 | } | |
174 | ||
175 | /** | |
176 | * iscsi_tcp_segment_done - check whether the segment is complete | |
177 | * @segment: iscsi segment to check | |
178 | * @recv: set to one of this is called from the recv path | |
179 | * @copied: number of bytes copied | |
180 | * | |
181 | * Check if we're done receiving this segment. If the receive | |
182 | * buffer is full but we expect more data, move on to the | |
183 | * next entry in the scatterlist. | |
184 | * | |
185 | * If the amount of data we received isn't a multiple of 4, | |
186 | * we will transparently receive the pad bytes, too. | |
187 | * | |
188 | * This function must be re-entrant. | |
189 | */ | |
190 | static inline int | |
191 | iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied) | |
192 | { | |
193 | static unsigned char padbuf[ISCSI_PAD_LEN]; | |
194 | struct scatterlist sg; | |
195 | unsigned int pad; | |
196 | ||
197 | debug_tcp("copied %u %u size %u %s\n", segment->copied, copied, | |
198 | segment->size, recv ? "recv" : "xmit"); | |
199 | if (segment->hash && copied) { | |
200 | /* | |
201 | * If a segment is kmapd we must unmap it before sending | |
202 | * to the crypto layer since that will try to kmap it again. | |
203 | */ | |
204 | iscsi_tcp_segment_unmap(segment); | |
205 | ||
206 | if (!segment->data) { | |
207 | sg_init_table(&sg, 1); | |
208 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
209 | segment->copied + segment->sg_offset + | |
210 | segment->sg->offset); | |
211 | } else | |
212 | sg_init_one(&sg, segment->data + segment->copied, | |
213 | copied); | |
214 | crypto_hash_update(segment->hash, &sg, copied); | |
215 | } | |
216 | ||
217 | segment->copied += copied; | |
218 | if (segment->copied < segment->size) { | |
219 | iscsi_tcp_segment_map(segment, recv); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | segment->total_copied += segment->copied; | |
224 | segment->copied = 0; | |
225 | segment->size = 0; | |
226 | ||
227 | /* Unmap the current scatterlist page, if there is one. */ | |
228 | iscsi_tcp_segment_unmap(segment); | |
229 | ||
230 | /* Do we have more scatterlist entries? */ | |
231 | debug_tcp("total copied %u total size %u\n", segment->total_copied, | |
232 | segment->total_size); | |
233 | if (segment->total_copied < segment->total_size) { | |
234 | /* Proceed to the next entry in the scatterlist. */ | |
235 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), | |
236 | 0); | |
237 | iscsi_tcp_segment_map(segment, recv); | |
238 | BUG_ON(segment->size == 0); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /* Do we need to handle padding? */ | |
243 | pad = iscsi_padding(segment->total_copied); | |
244 | if (pad != 0) { | |
245 | debug_tcp("consume %d pad bytes\n", pad); | |
246 | segment->total_size += pad; | |
247 | segment->size = pad; | |
248 | segment->data = padbuf; | |
249 | return 0; | |
250 | } | |
251 | ||
252 | /* | |
253 | * Set us up for transferring the data digest. hdr digest | |
254 | * is completely handled in hdr done function. | |
255 | */ | |
256 | if (segment->hash) { | |
257 | crypto_hash_final(segment->hash, segment->digest); | |
258 | iscsi_tcp_segment_splice_digest(segment, | |
259 | recv ? segment->recv_digest : segment->digest); | |
260 | return 0; | |
261 | } | |
262 | ||
263 | return 1; | |
264 | } | |
265 | ||
266 | /** | |
267 | * iscsi_tcp_xmit_segment - transmit segment | |
268 | * @tcp_conn: the iSCSI TCP connection | |
269 | * @segment: the buffer to transmnit | |
270 | * | |
271 | * This function transmits as much of the buffer as | |
272 | * the network layer will accept, and returns the number of | |
273 | * bytes transmitted. | |
274 | * | |
275 | * If CRC hashing is enabled, the function will compute the | |
276 | * hash as it goes. When the entire segment has been transmitted, | |
277 | * it will retrieve the hash value and send it as well. | |
278 | */ | |
279 | static int | |
280 | iscsi_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, | |
281 | struct iscsi_segment *segment) | |
282 | { | |
283 | struct socket *sk = tcp_conn->sock; | |
284 | unsigned int copied = 0; | |
285 | int r = 0; | |
286 | ||
287 | while (!iscsi_tcp_segment_done(segment, 0, r)) { | |
288 | struct scatterlist *sg; | |
289 | unsigned int offset, copy; | |
290 | int flags = 0; | |
291 | ||
292 | r = 0; | |
293 | offset = segment->copied; | |
294 | copy = segment->size - offset; | |
295 | ||
296 | if (segment->total_copied + segment->size < segment->total_size) | |
297 | flags |= MSG_MORE; | |
298 | ||
299 | /* Use sendpage if we can; else fall back to sendmsg */ | |
300 | if (!segment->data) { | |
301 | sg = segment->sg; | |
302 | offset += segment->sg_offset + sg->offset; | |
303 | r = tcp_conn->sendpage(sk, sg_page(sg), offset, copy, | |
304 | flags); | |
305 | } else { | |
306 | struct msghdr msg = { .msg_flags = flags }; | |
307 | struct kvec iov = { | |
308 | .iov_base = segment->data + offset, | |
309 | .iov_len = copy | |
310 | }; | |
311 | ||
312 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
313 | } | |
314 | ||
315 | if (r < 0) { | |
316 | iscsi_tcp_segment_unmap(segment); | |
317 | if (copied || r == -EAGAIN) | |
318 | break; | |
319 | return r; | |
320 | } | |
321 | copied += r; | |
322 | } | |
323 | return copied; | |
324 | } | |
325 | ||
326 | /** | |
327 | * iscsi_tcp_segment_recv - copy data to segment | |
328 | * @tcp_conn: the iSCSI TCP connection | |
329 | * @segment: the buffer to copy to | |
330 | * @ptr: data pointer | |
331 | * @len: amount of data available | |
332 | * | |
333 | * This function copies up to @len bytes to the | |
334 | * given buffer, and returns the number of bytes | |
335 | * consumed, which can actually be less than @len. | |
336 | * | |
337 | * If hash digest is enabled, the function will update the | |
338 | * hash while copying. | |
339 | * Combining these two operations doesn't buy us a lot (yet), | |
340 | * but in the future we could implement combined copy+crc, | |
341 | * just way we do for network layer checksums. | |
342 | */ | |
343 | static int | |
344 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, | |
345 | struct iscsi_segment *segment, const void *ptr, | |
346 | unsigned int len) | |
347 | { | |
348 | unsigned int copy = 0, copied = 0; | |
349 | ||
350 | while (!iscsi_tcp_segment_done(segment, 1, copy)) { | |
351 | if (copied == len) { | |
352 | debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n", | |
353 | len); | |
354 | break; | |
355 | } | |
356 | ||
357 | copy = min(len - copied, segment->size - segment->copied); | |
358 | debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy); | |
359 | memcpy(segment->data + segment->copied, ptr + copied, copy); | |
360 | copied += copy; | |
361 | } | |
362 | return copied; | |
363 | } | |
364 | ||
365 | static inline void | |
366 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
367 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
368 | { | |
369 | struct scatterlist sg; | |
370 | ||
371 | sg_init_one(&sg, hdr, hdrlen); | |
372 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
373 | } | |
374 | ||
375 | static inline int | |
376 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
377 | struct iscsi_segment *segment) | |
378 | { | |
379 | if (!segment->digest_len) | |
380 | return 1; | |
381 | ||
382 | if (memcmp(segment->recv_digest, segment->digest, | |
383 | segment->digest_len)) { | |
384 | debug_scsi("digest mismatch\n"); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | return 1; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Helper function to set up segment buffer | |
393 | */ | |
394 | static inline void | |
395 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, | |
396 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
397 | { | |
398 | memset(segment, 0, sizeof(*segment)); | |
399 | segment->total_size = size; | |
400 | segment->done = done; | |
401 | ||
402 | if (hash) { | |
403 | segment->hash = hash; | |
404 | crypto_hash_init(hash); | |
405 | } | |
406 | } | |
407 | ||
408 | static inline void | |
409 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, | |
410 | size_t size, iscsi_segment_done_fn_t *done, | |
411 | struct hash_desc *hash) | |
412 | { | |
413 | __iscsi_segment_init(segment, size, done, hash); | |
414 | segment->data = data; | |
415 | segment->size = size; | |
416 | } | |
417 | ||
418 | static inline int | |
419 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
420 | struct scatterlist *sg_list, unsigned int sg_count, | |
421 | unsigned int offset, size_t size, | |
422 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
423 | { | |
424 | struct scatterlist *sg; | |
425 | unsigned int i; | |
426 | ||
427 | debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n", | |
428 | offset, size); | |
429 | __iscsi_segment_init(segment, size, done, hash); | |
430 | for_each_sg(sg_list, sg, sg_count, i) { | |
431 | debug_scsi("sg %d, len %u offset %u\n", i, sg->length, | |
432 | sg->offset); | |
433 | if (offset < sg->length) { | |
434 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
435 | return 0; | |
436 | } | |
437 | offset -= sg->length; | |
438 | } | |
439 | ||
440 | return ISCSI_ERR_DATA_OFFSET; | |
441 | } | |
442 | ||
443 | /** | |
444 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception | |
445 | * @tcp_conn: iscsi connection to prep for | |
446 | * | |
447 | * This function always passes NULL for the hash argument, because when this | |
448 | * function is called we do not yet know the final size of the header and want | |
449 | * to delay the digest processing until we know that. | |
450 | */ | |
451 | static void | |
452 | iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
453 | { | |
454 | debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn, | |
455 | tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : ""); | |
456 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
457 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
458 | iscsi_tcp_hdr_recv_done, NULL); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Handle incoming reply to any other type of command | |
463 | */ | |
464 | static int | |
465 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
466 | struct iscsi_segment *segment) | |
467 | { | |
468 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
469 | int rc = 0; | |
470 | ||
471 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
472 | return ISCSI_ERR_DATA_DGST; | |
473 | ||
474 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
475 | conn->data, tcp_conn->in.datalen); | |
476 | if (rc) | |
477 | return rc; | |
478 | ||
479 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static void | |
484 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
485 | { | |
486 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
487 | struct hash_desc *rx_hash = NULL; | |
488 | ||
489 | if (conn->datadgst_en) | |
490 | rx_hash = &tcp_conn->rx_hash; | |
491 | ||
492 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
493 | conn->data, tcp_conn->in.datalen, | |
494 | iscsi_tcp_data_recv_done, rx_hash); | |
495 | } | |
496 | ||
497 | /* | |
498 | * must be called with session lock | |
499 | */ | |
500 | static void | |
501 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
502 | { | |
503 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
504 | struct iscsi_r2t_info *r2t; | |
505 | ||
506 | /* flush ctask's r2t queues */ | |
507 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
508 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
509 | sizeof(void*)); | |
510 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
511 | } | |
512 | ||
513 | r2t = tcp_ctask->r2t; | |
514 | if (r2t != NULL) { | |
515 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
516 | sizeof(void*)); | |
517 | tcp_ctask->r2t = NULL; | |
518 | } | |
519 | } | |
520 | ||
521 | /** | |
522 | * iscsi_data_rsp - SCSI Data-In Response processing | |
523 | * @conn: iscsi connection | |
524 | * @ctask: scsi command task | |
525 | **/ | |
526 | static int | |
527 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
528 | { | |
529 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
530 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
531 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
532 | struct iscsi_session *session = conn->session; | |
533 | struct scsi_cmnd *sc = ctask->sc; | |
534 | int datasn = be32_to_cpu(rhdr->datasn); | |
535 | unsigned total_in_length = scsi_in(sc)->length; | |
536 | ||
537 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
538 | if (tcp_conn->in.datalen == 0) | |
539 | return 0; | |
540 | ||
541 | if (tcp_ctask->exp_datasn != datasn) { | |
542 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
543 | __FUNCTION__, tcp_ctask->exp_datasn, datasn); | |
544 | return ISCSI_ERR_DATASN; | |
545 | } | |
546 | ||
547 | tcp_ctask->exp_datasn++; | |
548 | ||
549 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); | |
550 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > total_in_length) { | |
551 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", | |
552 | __FUNCTION__, tcp_ctask->data_offset, | |
553 | tcp_conn->in.datalen, total_in_length); | |
554 | return ISCSI_ERR_DATA_OFFSET; | |
555 | } | |
556 | ||
557 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
558 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
559 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
560 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
561 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
562 | int res_count = be32_to_cpu(rhdr->residual_count); | |
563 | ||
564 | if (res_count > 0 && | |
565 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
566 | res_count <= total_in_length)) | |
567 | scsi_in(sc)->resid = res_count; | |
568 | else | |
569 | sc->result = (DID_BAD_TARGET << 16) | | |
570 | rhdr->cmd_status; | |
571 | } | |
572 | } | |
573 | ||
574 | conn->datain_pdus_cnt++; | |
575 | return 0; | |
576 | } | |
577 | ||
578 | /** | |
579 | * iscsi_solicit_data_init - initialize first Data-Out | |
580 | * @conn: iscsi connection | |
581 | * @ctask: scsi command task | |
582 | * @r2t: R2T info | |
583 | * | |
584 | * Notes: | |
585 | * Initialize first Data-Out within this R2T sequence and finds | |
586 | * proper data_offset within this SCSI command. | |
587 | * | |
588 | * This function is called with connection lock taken. | |
589 | **/ | |
590 | static void | |
591 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
592 | struct iscsi_r2t_info *r2t) | |
593 | { | |
594 | struct iscsi_data *hdr; | |
595 | ||
596 | hdr = &r2t->dtask.hdr; | |
597 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
598 | hdr->ttt = r2t->ttt; | |
599 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
600 | r2t->solicit_datasn++; | |
601 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
602 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
603 | hdr->itt = ctask->hdr->itt; | |
604 | hdr->exp_statsn = r2t->exp_statsn; | |
605 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
606 | if (r2t->data_length > conn->max_xmit_dlength) { | |
607 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
608 | r2t->data_count = conn->max_xmit_dlength; | |
609 | hdr->flags = 0; | |
610 | } else { | |
611 | hton24(hdr->dlength, r2t->data_length); | |
612 | r2t->data_count = r2t->data_length; | |
613 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
614 | } | |
615 | conn->dataout_pdus_cnt++; | |
616 | ||
617 | r2t->sent = 0; | |
618 | } | |
619 | ||
620 | /** | |
621 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
622 | * @conn: iscsi connection | |
623 | * @ctask: scsi command task | |
624 | **/ | |
625 | static int | |
626 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
627 | { | |
628 | struct iscsi_r2t_info *r2t; | |
629 | struct iscsi_session *session = conn->session; | |
630 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
631 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
632 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
633 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
634 | int rc; | |
635 | ||
636 | if (tcp_conn->in.datalen) { | |
637 | iscsi_conn_printk(KERN_ERR, conn, | |
638 | "invalid R2t with datalen %d\n", | |
639 | tcp_conn->in.datalen); | |
640 | return ISCSI_ERR_DATALEN; | |
641 | } | |
642 | ||
643 | if (tcp_ctask->exp_datasn != r2tsn){ | |
644 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
645 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
646 | return ISCSI_ERR_R2TSN; | |
647 | } | |
648 | ||
649 | /* fill-in new R2T associated with the task */ | |
650 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
651 | ||
652 | if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) { | |
653 | iscsi_conn_printk(KERN_INFO, conn, | |
654 | "dropping R2T itt %d in recovery.\n", | |
655 | ctask->itt); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); | |
660 | BUG_ON(!rc); | |
661 | ||
662 | r2t->exp_statsn = rhdr->statsn; | |
663 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
664 | if (r2t->data_length == 0) { | |
665 | iscsi_conn_printk(KERN_ERR, conn, | |
666 | "invalid R2T with zero data len\n"); | |
667 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
668 | sizeof(void*)); | |
669 | return ISCSI_ERR_DATALEN; | |
670 | } | |
671 | ||
672 | if (r2t->data_length > session->max_burst) | |
673 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
674 | "Attempting to execute request.\n", | |
675 | r2t->data_length, session->max_burst); | |
676 | ||
677 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
678 | if (r2t->data_offset + r2t->data_length > scsi_out(ctask->sc)->length) { | |
679 | iscsi_conn_printk(KERN_ERR, conn, | |
680 | "invalid R2T with data len %u at offset %u " | |
681 | "and total length %d\n", r2t->data_length, | |
682 | r2t->data_offset, scsi_out(ctask->sc)->length); | |
683 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
684 | sizeof(void*)); | |
685 | return ISCSI_ERR_DATALEN; | |
686 | } | |
687 | ||
688 | r2t->ttt = rhdr->ttt; /* no flip */ | |
689 | r2t->solicit_datasn = 0; | |
690 | ||
691 | iscsi_solicit_data_init(conn, ctask, r2t); | |
692 | ||
693 | tcp_ctask->exp_datasn = r2tsn + 1; | |
694 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
695 | conn->r2t_pdus_cnt++; | |
696 | ||
697 | iscsi_requeue_ctask(ctask); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Handle incoming reply to DataIn command | |
703 | */ | |
704 | static int | |
705 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
706 | struct iscsi_segment *segment) | |
707 | { | |
708 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
709 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
710 | int rc; | |
711 | ||
712 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
713 | return ISCSI_ERR_DATA_DGST; | |
714 | ||
715 | /* check for non-exceptional status */ | |
716 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
717 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
718 | if (rc) | |
719 | return rc; | |
720 | } | |
721 | ||
722 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | /** | |
727 | * iscsi_tcp_hdr_dissect - process PDU header | |
728 | * @conn: iSCSI connection | |
729 | * @hdr: PDU header | |
730 | * | |
731 | * This function analyzes the header of the PDU received, | |
732 | * and performs several sanity checks. If the PDU is accompanied | |
733 | * by data, the receive buffer is set up to copy the incoming data | |
734 | * to the correct location. | |
735 | */ | |
736 | static int | |
737 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
738 | { | |
739 | int rc = 0, opcode, ahslen; | |
740 | struct iscsi_session *session = conn->session; | |
741 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
742 | struct iscsi_cmd_task *ctask; | |
743 | ||
744 | /* verify PDU length */ | |
745 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
746 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
747 | iscsi_conn_printk(KERN_ERR, conn, | |
748 | "iscsi_tcp: datalen %d > %d\n", | |
749 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
750 | return ISCSI_ERR_DATALEN; | |
751 | } | |
752 | ||
753 | /* Additional header segments. So far, we don't | |
754 | * process additional headers. | |
755 | */ | |
756 | ahslen = hdr->hlength << 2; | |
757 | ||
758 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
759 | /* verify itt (itt encoding: age+cid+itt) */ | |
760 | rc = iscsi_verify_itt(conn, hdr->itt); | |
761 | if (rc) | |
762 | return rc; | |
763 | ||
764 | debug_tcp("opcode 0x%x ahslen %d datalen %d\n", | |
765 | opcode, ahslen, tcp_conn->in.datalen); | |
766 | ||
767 | switch(opcode) { | |
768 | case ISCSI_OP_SCSI_DATA_IN: | |
769 | ctask = iscsi_itt_to_ctask(conn, hdr->itt); | |
770 | if (!ctask) | |
771 | return ISCSI_ERR_BAD_ITT; | |
772 | ||
773 | spin_lock(&conn->session->lock); | |
774 | rc = iscsi_data_rsp(conn, ctask); | |
775 | spin_unlock(&conn->session->lock); | |
776 | if (rc) | |
777 | return rc; | |
778 | if (tcp_conn->in.datalen) { | |
779 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
780 | struct hash_desc *rx_hash = NULL; | |
781 | struct scsi_data_buffer *sdb = scsi_in(ctask->sc); | |
782 | ||
783 | /* | |
784 | * Setup copy of Data-In into the Scsi_Cmnd | |
785 | * Scatterlist case: | |
786 | * We set up the iscsi_segment to point to the next | |
787 | * scatterlist entry to copy to. As we go along, | |
788 | * we move on to the next scatterlist entry and | |
789 | * update the digest per-entry. | |
790 | */ | |
791 | if (conn->datadgst_en) | |
792 | rx_hash = &tcp_conn->rx_hash; | |
793 | ||
794 | debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, " | |
795 | "datalen=%d)\n", tcp_conn, | |
796 | tcp_ctask->data_offset, | |
797 | tcp_conn->in.datalen); | |
798 | return iscsi_segment_seek_sg(&tcp_conn->in.segment, | |
799 | sdb->table.sgl, | |
800 | sdb->table.nents, | |
801 | tcp_ctask->data_offset, | |
802 | tcp_conn->in.datalen, | |
803 | iscsi_tcp_process_data_in, | |
804 | rx_hash); | |
805 | } | |
806 | /* fall through */ | |
807 | case ISCSI_OP_SCSI_CMD_RSP: | |
808 | if (tcp_conn->in.datalen) { | |
809 | iscsi_tcp_data_recv_prep(tcp_conn); | |
810 | return 0; | |
811 | } | |
812 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
813 | break; | |
814 | case ISCSI_OP_R2T: | |
815 | ctask = iscsi_itt_to_ctask(conn, hdr->itt); | |
816 | if (!ctask) | |
817 | return ISCSI_ERR_BAD_ITT; | |
818 | ||
819 | if (ahslen) | |
820 | rc = ISCSI_ERR_AHSLEN; | |
821 | else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) { | |
822 | spin_lock(&session->lock); | |
823 | rc = iscsi_r2t_rsp(conn, ctask); | |
824 | spin_unlock(&session->lock); | |
825 | } else | |
826 | rc = ISCSI_ERR_PROTO; | |
827 | break; | |
828 | case ISCSI_OP_LOGIN_RSP: | |
829 | case ISCSI_OP_TEXT_RSP: | |
830 | case ISCSI_OP_REJECT: | |
831 | case ISCSI_OP_ASYNC_EVENT: | |
832 | /* | |
833 | * It is possible that we could get a PDU with a buffer larger | |
834 | * than 8K, but there are no targets that currently do this. | |
835 | * For now we fail until we find a vendor that needs it | |
836 | */ | |
837 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
838 | iscsi_conn_printk(KERN_ERR, conn, | |
839 | "iscsi_tcp: received buffer of " | |
840 | "len %u but conn buffer is only %u " | |
841 | "(opcode %0x)\n", | |
842 | tcp_conn->in.datalen, | |
843 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
844 | rc = ISCSI_ERR_PROTO; | |
845 | break; | |
846 | } | |
847 | ||
848 | /* If there's data coming in with the response, | |
849 | * receive it to the connection's buffer. | |
850 | */ | |
851 | if (tcp_conn->in.datalen) { | |
852 | iscsi_tcp_data_recv_prep(tcp_conn); | |
853 | return 0; | |
854 | } | |
855 | /* fall through */ | |
856 | case ISCSI_OP_LOGOUT_RSP: | |
857 | case ISCSI_OP_NOOP_IN: | |
858 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
859 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
860 | break; | |
861 | default: | |
862 | rc = ISCSI_ERR_BAD_OPCODE; | |
863 | break; | |
864 | } | |
865 | ||
866 | if (rc == 0) { | |
867 | /* Anything that comes with data should have | |
868 | * been handled above. */ | |
869 | if (tcp_conn->in.datalen) | |
870 | return ISCSI_ERR_PROTO; | |
871 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
872 | } | |
873 | ||
874 | return rc; | |
875 | } | |
876 | ||
877 | /** | |
878 | * iscsi_tcp_hdr_recv_done - process PDU header | |
879 | * | |
880 | * This is the callback invoked when the PDU header has | |
881 | * been received. If the header is followed by additional | |
882 | * header segments, we go back for more data. | |
883 | */ | |
884 | static int | |
885 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
886 | struct iscsi_segment *segment) | |
887 | { | |
888 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
889 | struct iscsi_hdr *hdr; | |
890 | ||
891 | /* Check if there are additional header segments | |
892 | * *prior* to computing the digest, because we | |
893 | * may need to go back to the caller for more. | |
894 | */ | |
895 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
896 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
897 | /* Bump the header length - the caller will | |
898 | * just loop around and get the AHS for us, and | |
899 | * call again. */ | |
900 | unsigned int ahslen = hdr->hlength << 2; | |
901 | ||
902 | /* Make sure we don't overflow */ | |
903 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
904 | return ISCSI_ERR_AHSLEN; | |
905 | ||
906 | segment->total_size += ahslen; | |
907 | segment->size += ahslen; | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* We're done processing the header. See if we're doing | |
912 | * header digests; if so, set up the recv_digest buffer | |
913 | * and go back for more. */ | |
914 | if (conn->hdrdgst_en) { | |
915 | if (segment->digest_len == 0) { | |
916 | iscsi_tcp_segment_splice_digest(segment, | |
917 | segment->recv_digest); | |
918 | return 0; | |
919 | } | |
920 | iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr, | |
921 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
922 | segment->digest); | |
923 | ||
924 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
925 | return ISCSI_ERR_HDR_DGST; | |
926 | } | |
927 | ||
928 | tcp_conn->in.hdr = hdr; | |
929 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
930 | } | |
931 | ||
932 | /** | |
933 | * iscsi_tcp_recv - TCP receive in sendfile fashion | |
934 | * @rd_desc: read descriptor | |
935 | * @skb: socket buffer | |
936 | * @offset: offset in skb | |
937 | * @len: skb->len - offset | |
938 | **/ | |
939 | static int | |
940 | iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
941 | unsigned int offset, size_t len) | |
942 | { | |
943 | struct iscsi_conn *conn = rd_desc->arg.data; | |
944 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
945 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
946 | struct skb_seq_state seq; | |
947 | unsigned int consumed = 0; | |
948 | int rc = 0; | |
949 | ||
950 | debug_tcp("in %d bytes\n", skb->len - offset); | |
951 | ||
952 | if (unlikely(conn->suspend_rx)) { | |
953 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
958 | while (1) { | |
959 | unsigned int avail; | |
960 | const u8 *ptr; | |
961 | ||
962 | avail = skb_seq_read(consumed, &ptr, &seq); | |
963 | if (avail == 0) { | |
964 | debug_tcp("no more data avail. Consumed %d\n", | |
965 | consumed); | |
966 | break; | |
967 | } | |
968 | BUG_ON(segment->copied >= segment->size); | |
969 | ||
970 | debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail); | |
971 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); | |
972 | BUG_ON(rc == 0); | |
973 | consumed += rc; | |
974 | ||
975 | if (segment->total_copied >= segment->total_size) { | |
976 | debug_tcp("segment done\n"); | |
977 | rc = segment->done(tcp_conn, segment); | |
978 | if (rc != 0) { | |
979 | skb_abort_seq_read(&seq); | |
980 | goto error; | |
981 | } | |
982 | ||
983 | /* The done() functions sets up the | |
984 | * next segment. */ | |
985 | } | |
986 | } | |
987 | skb_abort_seq_read(&seq); | |
988 | conn->rxdata_octets += consumed; | |
989 | return consumed; | |
990 | ||
991 | error: | |
992 | debug_tcp("Error receiving PDU, errno=%d\n", rc); | |
993 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
994 | return 0; | |
995 | } | |
996 | ||
997 | static void | |
998 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
999 | { | |
1000 | struct iscsi_conn *conn = sk->sk_user_data; | |
1001 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1002 | read_descriptor_t rd_desc; | |
1003 | ||
1004 | read_lock(&sk->sk_callback_lock); | |
1005 | ||
1006 | /* | |
1007 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. | |
1008 | * We set count to 1 because we want the network layer to | |
1009 | * hand us all the skbs that are available. iscsi_tcp_recv | |
1010 | * handled pdus that cross buffers or pdus that still need data. | |
1011 | */ | |
1012 | rd_desc.arg.data = conn; | |
1013 | rd_desc.count = 1; | |
1014 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv); | |
1015 | ||
1016 | read_unlock(&sk->sk_callback_lock); | |
1017 | ||
1018 | /* If we had to (atomically) map a highmem page, | |
1019 | * unmap it now. */ | |
1020 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); | |
1021 | } | |
1022 | ||
1023 | static void | |
1024 | iscsi_tcp_state_change(struct sock *sk) | |
1025 | { | |
1026 | struct iscsi_tcp_conn *tcp_conn; | |
1027 | struct iscsi_conn *conn; | |
1028 | struct iscsi_session *session; | |
1029 | void (*old_state_change)(struct sock *); | |
1030 | ||
1031 | read_lock(&sk->sk_callback_lock); | |
1032 | ||
1033 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1034 | session = conn->session; | |
1035 | ||
1036 | if ((sk->sk_state == TCP_CLOSE_WAIT || | |
1037 | sk->sk_state == TCP_CLOSE) && | |
1038 | !atomic_read(&sk->sk_rmem_alloc)) { | |
1039 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
1040 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1041 | } | |
1042 | ||
1043 | tcp_conn = conn->dd_data; | |
1044 | old_state_change = tcp_conn->old_state_change; | |
1045 | ||
1046 | read_unlock(&sk->sk_callback_lock); | |
1047 | ||
1048 | old_state_change(sk); | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * iscsi_write_space - Called when more output buffer space is available | |
1053 | * @sk: socket space is available for | |
1054 | **/ | |
1055 | static void | |
1056 | iscsi_write_space(struct sock *sk) | |
1057 | { | |
1058 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
1059 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1060 | ||
1061 | tcp_conn->old_write_space(sk); | |
1062 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); | |
1063 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1064 | } | |
1065 | ||
1066 | static void | |
1067 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1068 | { | |
1069 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1070 | struct sock *sk = tcp_conn->sock->sk; | |
1071 | ||
1072 | /* assign new callbacks */ | |
1073 | write_lock_bh(&sk->sk_callback_lock); | |
1074 | sk->sk_user_data = conn; | |
1075 | tcp_conn->old_data_ready = sk->sk_data_ready; | |
1076 | tcp_conn->old_state_change = sk->sk_state_change; | |
1077 | tcp_conn->old_write_space = sk->sk_write_space; | |
1078 | sk->sk_data_ready = iscsi_tcp_data_ready; | |
1079 | sk->sk_state_change = iscsi_tcp_state_change; | |
1080 | sk->sk_write_space = iscsi_write_space; | |
1081 | write_unlock_bh(&sk->sk_callback_lock); | |
1082 | } | |
1083 | ||
1084 | static void | |
1085 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) | |
1086 | { | |
1087 | struct sock *sk = tcp_conn->sock->sk; | |
1088 | ||
1089 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1090 | write_lock_bh(&sk->sk_callback_lock); | |
1091 | sk->sk_user_data = NULL; | |
1092 | sk->sk_data_ready = tcp_conn->old_data_ready; | |
1093 | sk->sk_state_change = tcp_conn->old_state_change; | |
1094 | sk->sk_write_space = tcp_conn->old_write_space; | |
1095 | sk->sk_no_check = 0; | |
1096 | write_unlock_bh(&sk->sk_callback_lock); | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * iscsi_xmit - TCP transmit | |
1101 | **/ | |
1102 | static int | |
1103 | iscsi_xmit(struct iscsi_conn *conn) | |
1104 | { | |
1105 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1106 | struct iscsi_segment *segment = &tcp_conn->out.segment; | |
1107 | unsigned int consumed = 0; | |
1108 | int rc = 0; | |
1109 | ||
1110 | while (1) { | |
1111 | rc = iscsi_tcp_xmit_segment(tcp_conn, segment); | |
1112 | if (rc < 0) | |
1113 | goto error; | |
1114 | if (rc == 0) | |
1115 | break; | |
1116 | ||
1117 | consumed += rc; | |
1118 | ||
1119 | if (segment->total_copied >= segment->total_size) { | |
1120 | if (segment->done != NULL) { | |
1121 | rc = segment->done(tcp_conn, segment); | |
1122 | if (rc < 0) | |
1123 | goto error; | |
1124 | } | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | debug_tcp("xmit %d bytes\n", consumed); | |
1129 | ||
1130 | conn->txdata_octets += consumed; | |
1131 | return consumed; | |
1132 | ||
1133 | error: | |
1134 | /* Transmit error. We could initiate error recovery | |
1135 | * here. */ | |
1136 | debug_tcp("Error sending PDU, errno=%d\n", rc); | |
1137 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1138 | return rc; | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit | |
1143 | */ | |
1144 | static inline int | |
1145 | iscsi_tcp_xmit_qlen(struct iscsi_conn *conn) | |
1146 | { | |
1147 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1148 | struct iscsi_segment *segment = &tcp_conn->out.segment; | |
1149 | ||
1150 | return segment->total_copied - segment->total_size; | |
1151 | } | |
1152 | ||
1153 | static inline int | |
1154 | iscsi_tcp_flush(struct iscsi_conn *conn) | |
1155 | { | |
1156 | int rc; | |
1157 | ||
1158 | while (iscsi_tcp_xmit_qlen(conn)) { | |
1159 | rc = iscsi_xmit(conn); | |
1160 | if (rc == 0) | |
1161 | return -EAGAIN; | |
1162 | if (rc < 0) | |
1163 | return rc; | |
1164 | } | |
1165 | ||
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * This is called when we're done sending the header. | |
1171 | * Simply copy the data_segment to the send segment, and return. | |
1172 | */ | |
1173 | static int | |
1174 | iscsi_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, | |
1175 | struct iscsi_segment *segment) | |
1176 | { | |
1177 | tcp_conn->out.segment = tcp_conn->out.data_segment; | |
1178 | debug_tcp("Header done. Next segment size %u total_size %u\n", | |
1179 | tcp_conn->out.segment.size, tcp_conn->out.segment.total_size); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static void | |
1184 | iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen) | |
1185 | { | |
1186 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1187 | ||
1188 | debug_tcp("%s(%p%s)\n", __FUNCTION__, tcp_conn, | |
1189 | conn->hdrdgst_en? ", digest enabled" : ""); | |
1190 | ||
1191 | /* Clear the data segment - needs to be filled in by the | |
1192 | * caller using iscsi_tcp_send_data_prep() */ | |
1193 | memset(&tcp_conn->out.data_segment, 0, sizeof(struct iscsi_segment)); | |
1194 | ||
1195 | /* If header digest is enabled, compute the CRC and | |
1196 | * place the digest into the same buffer. We make | |
1197 | * sure that both iscsi_tcp_ctask and mtask have | |
1198 | * sufficient room. | |
1199 | */ | |
1200 | if (conn->hdrdgst_en) { | |
1201 | iscsi_tcp_dgst_header(&tcp_conn->tx_hash, hdr, hdrlen, | |
1202 | hdr + hdrlen); | |
1203 | hdrlen += ISCSI_DIGEST_SIZE; | |
1204 | } | |
1205 | ||
1206 | /* Remember header pointer for later, when we need | |
1207 | * to decide whether there's a payload to go along | |
1208 | * with the header. */ | |
1209 | tcp_conn->out.hdr = hdr; | |
1210 | ||
1211 | iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen, | |
1212 | iscsi_tcp_send_hdr_done, NULL); | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Prepare the send buffer for the payload data. | |
1217 | * Padding and checksumming will all be taken care | |
1218 | * of by the iscsi_segment routines. | |
1219 | */ | |
1220 | static int | |
1221 | iscsi_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, | |
1222 | unsigned int count, unsigned int offset, | |
1223 | unsigned int len) | |
1224 | { | |
1225 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1226 | struct hash_desc *tx_hash = NULL; | |
1227 | unsigned int hdr_spec_len; | |
1228 | ||
1229 | debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __FUNCTION__, | |
1230 | tcp_conn, offset, len, | |
1231 | conn->datadgst_en? ", digest enabled" : ""); | |
1232 | ||
1233 | /* Make sure the datalen matches what the caller | |
1234 | said he would send. */ | |
1235 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1236 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1237 | ||
1238 | if (conn->datadgst_en) | |
1239 | tx_hash = &tcp_conn->tx_hash; | |
1240 | ||
1241 | return iscsi_segment_seek_sg(&tcp_conn->out.data_segment, | |
1242 | sg, count, offset, len, | |
1243 | NULL, tx_hash); | |
1244 | } | |
1245 | ||
1246 | static void | |
1247 | iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data, | |
1248 | size_t len) | |
1249 | { | |
1250 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1251 | struct hash_desc *tx_hash = NULL; | |
1252 | unsigned int hdr_spec_len; | |
1253 | ||
1254 | debug_tcp("%s(%p, datalen=%d%s)\n", __FUNCTION__, tcp_conn, len, | |
1255 | conn->datadgst_en? ", digest enabled" : ""); | |
1256 | ||
1257 | /* Make sure the datalen matches what the caller | |
1258 | said he would send. */ | |
1259 | hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength); | |
1260 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); | |
1261 | ||
1262 | if (conn->datadgst_en) | |
1263 | tx_hash = &tcp_conn->tx_hash; | |
1264 | ||
1265 | iscsi_segment_init_linear(&tcp_conn->out.data_segment, | |
1266 | data, len, NULL, tx_hash); | |
1267 | } | |
1268 | ||
1269 | /** | |
1270 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1271 | * @conn: iscsi connection | |
1272 | * @ctask: scsi command task | |
1273 | * @r2t: R2T info | |
1274 | * @left: bytes left to transfer | |
1275 | * | |
1276 | * Notes: | |
1277 | * Initialize next Data-Out within this R2T sequence and continue | |
1278 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1279 | * | |
1280 | * Called under connection lock. | |
1281 | **/ | |
1282 | static int | |
1283 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1284 | struct iscsi_r2t_info *r2t) | |
1285 | { | |
1286 | struct iscsi_data *hdr; | |
1287 | int new_offset, left; | |
1288 | ||
1289 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1290 | left = r2t->data_length - r2t->sent; | |
1291 | if (left == 0) | |
1292 | return 0; | |
1293 | ||
1294 | hdr = &r2t->dtask.hdr; | |
1295 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
1296 | hdr->ttt = r2t->ttt; | |
1297 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1298 | r2t->solicit_datasn++; | |
1299 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
1300 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1301 | hdr->itt = ctask->hdr->itt; | |
1302 | hdr->exp_statsn = r2t->exp_statsn; | |
1303 | new_offset = r2t->data_offset + r2t->sent; | |
1304 | hdr->offset = cpu_to_be32(new_offset); | |
1305 | if (left > conn->max_xmit_dlength) { | |
1306 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1307 | r2t->data_count = conn->max_xmit_dlength; | |
1308 | } else { | |
1309 | hton24(hdr->dlength, left); | |
1310 | r2t->data_count = left; | |
1311 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1312 | } | |
1313 | ||
1314 | conn->dataout_pdus_cnt++; | |
1315 | return 1; | |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * iscsi_tcp_ctask - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
1320 | * @conn: iscsi connection | |
1321 | * @ctask: scsi command task | |
1322 | * @sc: scsi command | |
1323 | **/ | |
1324 | static int | |
1325 | iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask) | |
1326 | { | |
1327 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1328 | struct iscsi_conn *conn = ctask->conn; | |
1329 | struct scsi_cmnd *sc = ctask->sc; | |
1330 | int err; | |
1331 | ||
1332 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); | |
1333 | tcp_ctask->sent = 0; | |
1334 | tcp_ctask->exp_datasn = 0; | |
1335 | ||
1336 | /* Prepare PDU, optionally w/ immediate data */ | |
1337 | debug_scsi("ctask deq [cid %d itt 0x%x imm %d unsol %d]\n", | |
1338 | conn->id, ctask->itt, ctask->imm_count, | |
1339 | ctask->unsol_count); | |
1340 | iscsi_tcp_send_hdr_prep(conn, ctask->hdr, ctask->hdr_len); | |
1341 | ||
1342 | if (!ctask->imm_count) | |
1343 | return 0; | |
1344 | ||
1345 | /* If we have immediate data, attach a payload */ | |
1346 | err = iscsi_tcp_send_data_prep(conn, scsi_out(sc)->table.sgl, | |
1347 | scsi_out(sc)->table.nents, | |
1348 | 0, ctask->imm_count); | |
1349 | if (err) | |
1350 | return err; | |
1351 | tcp_ctask->sent += ctask->imm_count; | |
1352 | ctask->imm_count = 0; | |
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task | |
1358 | * @conn: iscsi connection | |
1359 | * @mtask: task management task | |
1360 | * | |
1361 | * Notes: | |
1362 | * The function can return -EAGAIN in which case caller must | |
1363 | * call it again later, or recover. '0' return code means successful | |
1364 | * xmit. | |
1365 | **/ | |
1366 | static int | |
1367 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) | |
1368 | { | |
1369 | int rc; | |
1370 | ||
1371 | /* Flush any pending data first. */ | |
1372 | rc = iscsi_tcp_flush(conn); | |
1373 | if (rc < 0) | |
1374 | return rc; | |
1375 | ||
1376 | if (mtask->hdr->itt == RESERVED_ITT) { | |
1377 | struct iscsi_session *session = conn->session; | |
1378 | ||
1379 | spin_lock_bh(&session->lock); | |
1380 | iscsi_free_mgmt_task(conn, mtask); | |
1381 | spin_unlock_bh(&session->lock); | |
1382 | } | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1389 | * @conn: iscsi connection | |
1390 | * @ctask: iscsi command task | |
1391 | * | |
1392 | * We're expected to return 0 when everything was transmitted succesfully, | |
1393 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind | |
1394 | * of error. | |
1395 | */ | |
1396 | static int | |
1397 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1398 | { | |
1399 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1400 | struct scsi_cmnd *sc = ctask->sc; | |
1401 | struct scsi_data_buffer *sdb = scsi_out(sc); | |
1402 | int rc = 0; | |
1403 | ||
1404 | flush: | |
1405 | /* Flush any pending data first. */ | |
1406 | rc = iscsi_tcp_flush(conn); | |
1407 | if (rc < 0) | |
1408 | return rc; | |
1409 | ||
1410 | /* Are we done already? */ | |
1411 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1412 | return 0; | |
1413 | ||
1414 | if (ctask->unsol_count != 0) { | |
1415 | struct iscsi_data *hdr = &tcp_ctask->unsol_dtask.hdr; | |
1416 | ||
1417 | /* Prepare a header for the unsolicited PDU. | |
1418 | * The amount of data we want to send will be | |
1419 | * in ctask->data_count. | |
1420 | * FIXME: return the data count instead. | |
1421 | */ | |
1422 | iscsi_prep_unsolicit_data_pdu(ctask, hdr); | |
1423 | ||
1424 | debug_tcp("unsol dout [itt 0x%x doff %d dlen %d]\n", | |
1425 | ctask->itt, tcp_ctask->sent, ctask->data_count); | |
1426 | ||
1427 | iscsi_tcp_send_hdr_prep(conn, hdr, sizeof(*hdr)); | |
1428 | rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl, | |
1429 | sdb->table.nents, tcp_ctask->sent, | |
1430 | ctask->data_count); | |
1431 | if (rc) | |
1432 | goto fail; | |
1433 | tcp_ctask->sent += ctask->data_count; | |
1434 | ctask->unsol_count -= ctask->data_count; | |
1435 | goto flush; | |
1436 | } else { | |
1437 | struct iscsi_session *session = conn->session; | |
1438 | struct iscsi_r2t_info *r2t; | |
1439 | ||
1440 | /* All unsolicited PDUs sent. Check for solicited PDUs. | |
1441 | */ | |
1442 | spin_lock_bh(&session->lock); | |
1443 | r2t = tcp_ctask->r2t; | |
1444 | if (r2t != NULL) { | |
1445 | /* Continue with this R2T? */ | |
1446 | if (!iscsi_solicit_data_cont(conn, ctask, r2t)) { | |
1447 | debug_scsi(" done with r2t %p\n", r2t); | |
1448 | ||
1449 | __kfifo_put(tcp_ctask->r2tpool.queue, | |
1450 | (void*)&r2t, sizeof(void*)); | |
1451 | tcp_ctask->r2t = r2t = NULL; | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | if (r2t == NULL) { | |
1456 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
1457 | sizeof(void*)); | |
1458 | r2t = tcp_ctask->r2t; | |
1459 | } | |
1460 | spin_unlock_bh(&session->lock); | |
1461 | ||
1462 | /* Waiting for more R2Ts to arrive. */ | |
1463 | if (r2t == NULL) { | |
1464 | debug_tcp("no R2Ts yet\n"); | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", | |
1469 | r2t, r2t->solicit_datasn - 1, ctask->itt, | |
1470 | r2t->data_offset + r2t->sent, r2t->data_count); | |
1471 | ||
1472 | iscsi_tcp_send_hdr_prep(conn, &r2t->dtask.hdr, | |
1473 | sizeof(struct iscsi_hdr)); | |
1474 | ||
1475 | rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl, | |
1476 | sdb->table.nents, | |
1477 | r2t->data_offset + r2t->sent, | |
1478 | r2t->data_count); | |
1479 | if (rc) | |
1480 | goto fail; | |
1481 | tcp_ctask->sent += r2t->data_count; | |
1482 | r2t->sent += r2t->data_count; | |
1483 | goto flush; | |
1484 | } | |
1485 | return 0; | |
1486 | fail: | |
1487 | iscsi_conn_failure(conn, rc); | |
1488 | return -EIO; | |
1489 | } | |
1490 | ||
1491 | static struct iscsi_cls_conn * | |
1492 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1493 | { | |
1494 | struct iscsi_conn *conn; | |
1495 | struct iscsi_cls_conn *cls_conn; | |
1496 | struct iscsi_tcp_conn *tcp_conn; | |
1497 | ||
1498 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx); | |
1499 | if (!cls_conn) | |
1500 | return NULL; | |
1501 | conn = cls_conn->dd_data; | |
1502 | /* | |
1503 | * due to strange issues with iser these are not set | |
1504 | * in iscsi_conn_setup | |
1505 | */ | |
1506 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1507 | ||
1508 | tcp_conn = conn->dd_data; | |
1509 | tcp_conn->iscsi_conn = conn; | |
1510 | ||
1511 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, | |
1512 | CRYPTO_ALG_ASYNC); | |
1513 | tcp_conn->tx_hash.flags = 0; | |
1514 | if (IS_ERR(tcp_conn->tx_hash.tfm)) | |
1515 | goto free_conn; | |
1516 | ||
1517 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, | |
1518 | CRYPTO_ALG_ASYNC); | |
1519 | tcp_conn->rx_hash.flags = 0; | |
1520 | if (IS_ERR(tcp_conn->rx_hash.tfm)) | |
1521 | goto free_tx_tfm; | |
1522 | ||
1523 | return cls_conn; | |
1524 | ||
1525 | free_tx_tfm: | |
1526 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1527 | free_conn: | |
1528 | iscsi_conn_printk(KERN_ERR, conn, | |
1529 | "Could not create connection due to crc32c " | |
1530 | "loading error. Make sure the crc32c " | |
1531 | "module is built as a module or into the " | |
1532 | "kernel\n"); | |
1533 | iscsi_conn_teardown(cls_conn); | |
1534 | return NULL; | |
1535 | } | |
1536 | ||
1537 | static void | |
1538 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1539 | { | |
1540 | struct iscsi_session *session = conn->session; | |
1541 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1542 | struct socket *sock = tcp_conn->sock; | |
1543 | ||
1544 | if (!sock) | |
1545 | return; | |
1546 | ||
1547 | sock_hold(sock->sk); | |
1548 | iscsi_conn_restore_callbacks(tcp_conn); | |
1549 | sock_put(sock->sk); | |
1550 | ||
1551 | spin_lock_bh(&session->lock); | |
1552 | tcp_conn->sock = NULL; | |
1553 | conn->recv_lock = NULL; | |
1554 | spin_unlock_bh(&session->lock); | |
1555 | sockfd_put(sock); | |
1556 | } | |
1557 | ||
1558 | static void | |
1559 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
1560 | { | |
1561 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1562 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1563 | ||
1564 | iscsi_tcp_release_conn(conn); | |
1565 | ||
1566 | if (tcp_conn->tx_hash.tfm) | |
1567 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1568 | if (tcp_conn->rx_hash.tfm) | |
1569 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
1570 | ||
1571 | iscsi_conn_teardown(cls_conn); | |
1572 | } | |
1573 | ||
1574 | static void | |
1575 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1576 | { | |
1577 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1578 | ||
1579 | iscsi_conn_stop(cls_conn, flag); | |
1580 | iscsi_tcp_release_conn(conn); | |
1581 | } | |
1582 | ||
1583 | static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, | |
1584 | char *buf, int *port, | |
1585 | int (*getname)(struct socket *, struct sockaddr *, | |
1586 | int *addrlen)) | |
1587 | { | |
1588 | struct sockaddr_storage *addr; | |
1589 | struct sockaddr_in6 *sin6; | |
1590 | struct sockaddr_in *sin; | |
1591 | int rc = 0, len; | |
1592 | ||
1593 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); | |
1594 | if (!addr) | |
1595 | return -ENOMEM; | |
1596 | ||
1597 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
1598 | rc = -ENODEV; | |
1599 | goto free_addr; | |
1600 | } | |
1601 | ||
1602 | switch (addr->ss_family) { | |
1603 | case AF_INET: | |
1604 | sin = (struct sockaddr_in *)addr; | |
1605 | spin_lock_bh(&conn->session->lock); | |
1606 | sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); | |
1607 | *port = be16_to_cpu(sin->sin_port); | |
1608 | spin_unlock_bh(&conn->session->lock); | |
1609 | break; | |
1610 | case AF_INET6: | |
1611 | sin6 = (struct sockaddr_in6 *)addr; | |
1612 | spin_lock_bh(&conn->session->lock); | |
1613 | sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr)); | |
1614 | *port = be16_to_cpu(sin6->sin6_port); | |
1615 | spin_unlock_bh(&conn->session->lock); | |
1616 | break; | |
1617 | } | |
1618 | free_addr: | |
1619 | kfree(addr); | |
1620 | return rc; | |
1621 | } | |
1622 | ||
1623 | static int | |
1624 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
1625 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
1626 | int is_leading) | |
1627 | { | |
1628 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1629 | struct iscsi_host *ihost = shost_priv(shost); | |
1630 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1631 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1632 | struct sock *sk; | |
1633 | struct socket *sock; | |
1634 | int err; | |
1635 | ||
1636 | /* lookup for existing socket */ | |
1637 | sock = sockfd_lookup((int)transport_eph, &err); | |
1638 | if (!sock) { | |
1639 | iscsi_conn_printk(KERN_ERR, conn, | |
1640 | "sockfd_lookup failed %d\n", err); | |
1641 | return -EEXIST; | |
1642 | } | |
1643 | /* | |
1644 | * copy these values now because if we drop the session | |
1645 | * userspace may still want to query the values since we will | |
1646 | * be using them for the reconnect | |
1647 | */ | |
1648 | err = iscsi_tcp_get_addr(conn, sock, conn->portal_address, | |
1649 | &conn->portal_port, kernel_getpeername); | |
1650 | if (err) | |
1651 | goto free_socket; | |
1652 | ||
1653 | err = iscsi_tcp_get_addr(conn, sock, ihost->local_address, | |
1654 | &ihost->local_port, kernel_getsockname); | |
1655 | if (err) | |
1656 | goto free_socket; | |
1657 | ||
1658 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
1659 | if (err) | |
1660 | goto free_socket; | |
1661 | ||
1662 | /* bind iSCSI connection and socket */ | |
1663 | tcp_conn->sock = sock; | |
1664 | ||
1665 | /* setup Socket parameters */ | |
1666 | sk = sock->sk; | |
1667 | sk->sk_reuse = 1; | |
1668 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1669 | sk->sk_allocation = GFP_ATOMIC; | |
1670 | ||
1671 | /* FIXME: disable Nagle's algorithm */ | |
1672 | ||
1673 | /* | |
1674 | * Intercept TCP callbacks for sendfile like receive | |
1675 | * processing. | |
1676 | */ | |
1677 | conn->recv_lock = &sk->sk_callback_lock; | |
1678 | iscsi_conn_set_callbacks(conn); | |
1679 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1680 | /* | |
1681 | * set receive state machine into initial state | |
1682 | */ | |
1683 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
1684 | return 0; | |
1685 | ||
1686 | free_socket: | |
1687 | sockfd_put(sock); | |
1688 | return err; | |
1689 | } | |
1690 | ||
1691 | /* called with host lock */ | |
1692 | static void | |
1693 | iscsi_tcp_mtask_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) | |
1694 | { | |
1695 | debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); | |
1696 | ||
1697 | /* Prepare PDU, optionally w/ immediate data */ | |
1698 | iscsi_tcp_send_hdr_prep(conn, mtask->hdr, sizeof(*mtask->hdr)); | |
1699 | ||
1700 | /* If we have immediate data, attach a payload */ | |
1701 | if (mtask->data_count) | |
1702 | iscsi_tcp_send_linear_data_prepare(conn, mtask->data, | |
1703 | mtask->data_count); | |
1704 | } | |
1705 | ||
1706 | static int | |
1707 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1708 | { | |
1709 | int i; | |
1710 | int cmd_i; | |
1711 | ||
1712 | /* | |
1713 | * initialize per-task: R2T pool and xmit queue | |
1714 | */ | |
1715 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1716 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1717 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1718 | ||
1719 | /* | |
1720 | * pre-allocated x4 as much r2ts to handle race when | |
1721 | * target acks DataOut faster than we data_xmit() queues | |
1722 | * could replenish r2tqueue. | |
1723 | */ | |
1724 | ||
1725 | /* R2T pool */ | |
1726 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, NULL, | |
1727 | sizeof(struct iscsi_r2t_info))) { | |
1728 | goto r2t_alloc_fail; | |
1729 | } | |
1730 | ||
1731 | /* R2T xmit queue */ | |
1732 | tcp_ctask->r2tqueue = kfifo_alloc( | |
1733 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); | |
1734 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { | |
1735 | iscsi_pool_free(&tcp_ctask->r2tpool); | |
1736 | goto r2t_alloc_fail; | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | return 0; | |
1741 | ||
1742 | r2t_alloc_fail: | |
1743 | for (i = 0; i < cmd_i; i++) { | |
1744 | struct iscsi_cmd_task *ctask = session->cmds[i]; | |
1745 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1746 | ||
1747 | kfifo_free(tcp_ctask->r2tqueue); | |
1748 | iscsi_pool_free(&tcp_ctask->r2tpool); | |
1749 | } | |
1750 | return -ENOMEM; | |
1751 | } | |
1752 | ||
1753 | static void | |
1754 | iscsi_r2tpool_free(struct iscsi_session *session) | |
1755 | { | |
1756 | int i; | |
1757 | ||
1758 | for (i = 0; i < session->cmds_max; i++) { | |
1759 | struct iscsi_cmd_task *ctask = session->cmds[i]; | |
1760 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1761 | ||
1762 | kfifo_free(tcp_ctask->r2tqueue); | |
1763 | iscsi_pool_free(&tcp_ctask->r2tpool); | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | static int | |
1768 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, | |
1769 | char *buf, int buflen) | |
1770 | { | |
1771 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1772 | struct iscsi_session *session = conn->session; | |
1773 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1774 | int value; | |
1775 | ||
1776 | switch(param) { | |
1777 | case ISCSI_PARAM_HDRDGST_EN: | |
1778 | iscsi_set_param(cls_conn, param, buf, buflen); | |
1779 | break; | |
1780 | case ISCSI_PARAM_DATADGST_EN: | |
1781 | iscsi_set_param(cls_conn, param, buf, buflen); | |
1782 | tcp_conn->sendpage = conn->datadgst_en ? | |
1783 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
1784 | break; | |
1785 | case ISCSI_PARAM_MAX_R2T: | |
1786 | sscanf(buf, "%d", &value); | |
1787 | if (value <= 0 || !is_power_of_2(value)) | |
1788 | return -EINVAL; | |
1789 | if (session->max_r2t == value) | |
1790 | break; | |
1791 | iscsi_r2tpool_free(session); | |
1792 | iscsi_set_param(cls_conn, param, buf, buflen); | |
1793 | if (iscsi_r2tpool_alloc(session)) | |
1794 | return -ENOMEM; | |
1795 | break; | |
1796 | default: | |
1797 | return iscsi_set_param(cls_conn, param, buf, buflen); | |
1798 | } | |
1799 | ||
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | static int | |
1804 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
1805 | enum iscsi_param param, char *buf) | |
1806 | { | |
1807 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1808 | int len; | |
1809 | ||
1810 | switch(param) { | |
1811 | case ISCSI_PARAM_CONN_PORT: | |
1812 | spin_lock_bh(&conn->session->lock); | |
1813 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
1814 | spin_unlock_bh(&conn->session->lock); | |
1815 | break; | |
1816 | case ISCSI_PARAM_CONN_ADDRESS: | |
1817 | spin_lock_bh(&conn->session->lock); | |
1818 | len = sprintf(buf, "%s\n", conn->portal_address); | |
1819 | spin_unlock_bh(&conn->session->lock); | |
1820 | break; | |
1821 | default: | |
1822 | return iscsi_conn_get_param(cls_conn, param, buf); | |
1823 | } | |
1824 | ||
1825 | return len; | |
1826 | } | |
1827 | ||
1828 | static void | |
1829 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
1830 | { | |
1831 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1832 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1833 | ||
1834 | stats->txdata_octets = conn->txdata_octets; | |
1835 | stats->rxdata_octets = conn->rxdata_octets; | |
1836 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1837 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1838 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1839 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1840 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1841 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1842 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1843 | stats->custom_length = 3; | |
1844 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
1845 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; | |
1846 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); | |
1847 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; | |
1848 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
1849 | stats->custom[2].value = conn->eh_abort_cnt; | |
1850 | } | |
1851 | ||
1852 | static struct iscsi_cls_session * | |
1853 | iscsi_tcp_session_create(struct Scsi_Host *shost, uint16_t cmds_max, | |
1854 | uint16_t qdepth, uint32_t initial_cmdsn, | |
1855 | uint32_t *hostno) | |
1856 | { | |
1857 | struct iscsi_cls_session *cls_session; | |
1858 | struct iscsi_session *session; | |
1859 | int cmd_i; | |
1860 | ||
1861 | if (shost) { | |
1862 | printk(KERN_ERR "iscsi_tcp: invalid shost %d.\n", | |
1863 | shost->host_no); | |
1864 | return NULL; | |
1865 | } | |
1866 | ||
1867 | shost = iscsi_host_alloc(&iscsi_sht, 0, qdepth); | |
1868 | if (!shost) | |
1869 | return NULL; | |
1870 | shost->transportt = iscsi_tcp_scsi_transport; | |
1871 | shost->max_lun = iscsi_max_lun; | |
1872 | shost->max_id = 0; | |
1873 | shost->max_channel = 0; | |
1874 | shost->max_cmd_len = 16; | |
1875 | shost->can_queue = cmds_max; | |
1876 | ||
1877 | if (iscsi_host_add(shost, NULL)) | |
1878 | goto free_host; | |
1879 | *hostno = shost->host_no; | |
1880 | ||
1881 | cls_session = iscsi_session_setup(&iscsi_tcp_transport, shost, cmds_max, | |
1882 | sizeof(struct iscsi_tcp_cmd_task), | |
1883 | sizeof(struct iscsi_tcp_mgmt_task), | |
1884 | initial_cmdsn); | |
1885 | if (!cls_session) | |
1886 | goto remove_host; | |
1887 | session = cls_session->dd_data; | |
1888 | ||
1889 | shost->can_queue = session->cmds_max; | |
1890 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1891 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1892 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1893 | ||
1894 | ctask->hdr = &tcp_ctask->hdr.cmd_hdr; | |
1895 | ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE; | |
1896 | } | |
1897 | ||
1898 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1899 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1900 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
1901 | ||
1902 | mtask->hdr = (struct iscsi_hdr *) &tcp_mtask->hdr; | |
1903 | } | |
1904 | ||
1905 | if (iscsi_r2tpool_alloc(session)) | |
1906 | goto remove_session; | |
1907 | return cls_session; | |
1908 | ||
1909 | remove_session: | |
1910 | iscsi_session_teardown(cls_session); | |
1911 | remove_host: | |
1912 | iscsi_host_remove(shost); | |
1913 | free_host: | |
1914 | iscsi_host_free(shost); | |
1915 | return NULL; | |
1916 | } | |
1917 | ||
1918 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
1919 | { | |
1920 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1921 | ||
1922 | iscsi_r2tpool_free(cls_session->dd_data); | |
1923 | ||
1924 | iscsi_host_remove(shost); | |
1925 | iscsi_host_free(shost); | |
1926 | } | |
1927 | ||
1928 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) | |
1929 | { | |
1930 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); | |
1931 | blk_queue_dma_alignment(sdev->request_queue, 0); | |
1932 | return 0; | |
1933 | } | |
1934 | ||
1935 | static struct scsi_host_template iscsi_sht = { | |
1936 | .module = THIS_MODULE, | |
1937 | .name = "iSCSI Initiator over TCP/IP", | |
1938 | .queuecommand = iscsi_queuecommand, | |
1939 | .change_queue_depth = iscsi_change_queue_depth, | |
1940 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, | |
1941 | .sg_tablesize = 4096, | |
1942 | .max_sectors = 0xFFFF, | |
1943 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
1944 | .eh_abort_handler = iscsi_eh_abort, | |
1945 | .eh_device_reset_handler= iscsi_eh_device_reset, | |
1946 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
1947 | .use_clustering = DISABLE_CLUSTERING, | |
1948 | .slave_configure = iscsi_tcp_slave_configure, | |
1949 | .proc_name = "iscsi_tcp", | |
1950 | .this_id = -1, | |
1951 | }; | |
1952 | ||
1953 | static struct iscsi_transport iscsi_tcp_transport = { | |
1954 | .owner = THIS_MODULE, | |
1955 | .name = "tcp", | |
1956 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1957 | | CAP_DATADGST, | |
1958 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
1959 | ISCSI_MAX_XMIT_DLENGTH | | |
1960 | ISCSI_HDRDGST_EN | | |
1961 | ISCSI_DATADGST_EN | | |
1962 | ISCSI_INITIAL_R2T_EN | | |
1963 | ISCSI_MAX_R2T | | |
1964 | ISCSI_IMM_DATA_EN | | |
1965 | ISCSI_FIRST_BURST | | |
1966 | ISCSI_MAX_BURST | | |
1967 | ISCSI_PDU_INORDER_EN | | |
1968 | ISCSI_DATASEQ_INORDER_EN | | |
1969 | ISCSI_ERL | | |
1970 | ISCSI_CONN_PORT | | |
1971 | ISCSI_CONN_ADDRESS | | |
1972 | ISCSI_EXP_STATSN | | |
1973 | ISCSI_PERSISTENT_PORT | | |
1974 | ISCSI_PERSISTENT_ADDRESS | | |
1975 | ISCSI_TARGET_NAME | ISCSI_TPGT | | |
1976 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
1977 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | | |
1978 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
1979 | ISCSI_LU_RESET_TMO | | |
1980 | ISCSI_PING_TMO | ISCSI_RECV_TMO, | |
1981 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | | |
1982 | ISCSI_HOST_INITIATOR_NAME | | |
1983 | ISCSI_HOST_NETDEV_NAME, | |
1984 | /* session management */ | |
1985 | .create_session = iscsi_tcp_session_create, | |
1986 | .destroy_session = iscsi_tcp_session_destroy, | |
1987 | /* connection management */ | |
1988 | .create_conn = iscsi_tcp_conn_create, | |
1989 | .bind_conn = iscsi_tcp_conn_bind, | |
1990 | .destroy_conn = iscsi_tcp_conn_destroy, | |
1991 | .set_param = iscsi_conn_set_param, | |
1992 | .get_conn_param = iscsi_tcp_conn_get_param, | |
1993 | .get_session_param = iscsi_session_get_param, | |
1994 | .start_conn = iscsi_conn_start, | |
1995 | .stop_conn = iscsi_tcp_conn_stop, | |
1996 | /* iscsi host params */ | |
1997 | .get_host_param = iscsi_host_get_param, | |
1998 | .set_host_param = iscsi_host_set_param, | |
1999 | /* IO */ | |
2000 | .send_pdu = iscsi_conn_send_pdu, | |
2001 | .get_stats = iscsi_conn_get_stats, | |
2002 | .init_cmd_task = iscsi_tcp_ctask_init, | |
2003 | .init_mgmt_task = iscsi_tcp_mtask_init, | |
2004 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2005 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2006 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2007 | /* recovery */ | |
2008 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
2009 | }; | |
2010 | ||
2011 | static int __init | |
2012 | iscsi_tcp_init(void) | |
2013 | { | |
2014 | if (iscsi_max_lun < 1) { | |
2015 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", | |
2016 | iscsi_max_lun); | |
2017 | return -EINVAL; | |
2018 | } | |
2019 | ||
2020 | iscsi_tcp_scsi_transport = iscsi_register_transport( | |
2021 | &iscsi_tcp_transport); | |
2022 | if (!iscsi_tcp_scsi_transport) | |
2023 | return -ENODEV; | |
2024 | ||
2025 | return 0; | |
2026 | } | |
2027 | ||
2028 | static void __exit | |
2029 | iscsi_tcp_exit(void) | |
2030 | { | |
2031 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
2032 | } | |
2033 | ||
2034 | module_init(iscsi_tcp_init); | |
2035 | module_exit(iscsi_tcp_exit); |