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a081c13e MC |
1 | /* |
2 | * iSCSI over TCP/IP Data-Path lib | |
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("Mike Christie <michaelc@cs.wisc.edu>, " | |
48 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
49 | "Alex Aizman <itn780@yahoo.com>"); | |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
a081c13e | 52 | |
0ab1c252 MC |
53 | static int iscsi_dbg_libtcp; |
54 | module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int, | |
55 | S_IRUGO | S_IWUSR); | |
56 | MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp " | |
57 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
58 | "is off."); | |
59 | ||
60 | #define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...) \ | |
61 | do { \ | |
62 | if (iscsi_dbg_libtcp) \ | |
63 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
64 | "%s " dbg_fmt, \ | |
65 | __func__, ##arg); \ | |
66 | } while (0); | |
a081c13e MC |
67 | |
68 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
69 | struct iscsi_segment *segment); | |
70 | ||
71 | /* | |
72 | * Scatterlist handling: inside the iscsi_segment, we | |
73 | * remember an index into the scatterlist, and set data/size | |
74 | * to the current scatterlist entry. For highmem pages, we | |
75 | * kmap as needed. | |
76 | * | |
77 | * Note that the page is unmapped when we return from | |
78 | * TCP's data_ready handler, so we may end up mapping and | |
79 | * unmapping the same page repeatedly. The whole reason | |
80 | * for this is that we shouldn't keep the page mapped | |
81 | * outside the softirq. | |
82 | */ | |
83 | ||
84 | /** | |
85 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry | |
86 | * @segment: the buffer object | |
87 | * @sg: scatterlist | |
88 | * @offset: byte offset into that sg entry | |
89 | * | |
90 | * This function sets up the segment so that subsequent | |
91 | * data is copied to the indicated sg entry, at the given | |
92 | * offset. | |
93 | */ | |
94 | static inline void | |
95 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, | |
96 | struct scatterlist *sg, unsigned int offset) | |
97 | { | |
98 | segment->sg = sg; | |
99 | segment->sg_offset = offset; | |
100 | segment->size = min(sg->length - offset, | |
101 | segment->total_size - segment->total_copied); | |
102 | segment->data = NULL; | |
103 | } | |
104 | ||
105 | /** | |
106 | * iscsi_tcp_segment_map - map the current S/G page | |
107 | * @segment: iscsi_segment | |
108 | * @recv: 1 if called from recv path | |
109 | * | |
110 | * We only need to possibly kmap data if scatter lists are being used, | |
111 | * because the iscsi passthrough and internal IO paths will never use high | |
112 | * mem pages. | |
113 | */ | |
114 | static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) | |
115 | { | |
116 | struct scatterlist *sg; | |
117 | ||
118 | if (segment->data != NULL || !segment->sg) | |
119 | return; | |
120 | ||
121 | sg = segment->sg; | |
122 | BUG_ON(segment->sg_mapped); | |
123 | BUG_ON(sg->length == 0); | |
124 | ||
125 | /* | |
126 | * If the page count is greater than one it is ok to send | |
127 | * to the network layer's zero copy send path. If not we | |
128 | * have to go the slow sendmsg path. We always map for the | |
129 | * recv path. | |
130 | */ | |
131 | if (page_count(sg_page(sg)) >= 1 && !recv) | |
132 | return; | |
133 | ||
a081c13e MC |
134 | segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0); |
135 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; | |
136 | } | |
137 | ||
138 | void iscsi_tcp_segment_unmap(struct iscsi_segment *segment) | |
139 | { | |
a081c13e | 140 | if (segment->sg_mapped) { |
a081c13e MC |
141 | kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0); |
142 | segment->sg_mapped = NULL; | |
143 | segment->data = NULL; | |
144 | } | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap); | |
147 | ||
148 | /* | |
149 | * Splice the digest buffer into the buffer | |
150 | */ | |
151 | static inline void | |
152 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) | |
153 | { | |
154 | segment->data = digest; | |
155 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
156 | segment->total_size += ISCSI_DIGEST_SIZE; | |
157 | segment->size = ISCSI_DIGEST_SIZE; | |
158 | segment->copied = 0; | |
159 | segment->sg = NULL; | |
160 | segment->hash = NULL; | |
161 | } | |
162 | ||
163 | /** | |
164 | * iscsi_tcp_segment_done - check whether the segment is complete | |
6df19a79 | 165 | * @tcp_conn: iscsi tcp connection |
a081c13e MC |
166 | * @segment: iscsi segment to check |
167 | * @recv: set to one of this is called from the recv path | |
168 | * @copied: number of bytes copied | |
169 | * | |
170 | * Check if we're done receiving this segment. If the receive | |
171 | * buffer is full but we expect more data, move on to the | |
172 | * next entry in the scatterlist. | |
173 | * | |
174 | * If the amount of data we received isn't a multiple of 4, | |
175 | * we will transparently receive the pad bytes, too. | |
176 | * | |
177 | * This function must be re-entrant. | |
178 | */ | |
6df19a79 MC |
179 | int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
180 | struct iscsi_segment *segment, int recv, | |
a081c13e MC |
181 | unsigned copied) |
182 | { | |
a081c13e MC |
183 | struct scatterlist sg; |
184 | unsigned int pad; | |
185 | ||
0ab1c252 MC |
186 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n", |
187 | segment->copied, copied, segment->size, | |
188 | recv ? "recv" : "xmit"); | |
a081c13e MC |
189 | if (segment->hash && copied) { |
190 | /* | |
191 | * If a segment is kmapd we must unmap it before sending | |
192 | * to the crypto layer since that will try to kmap it again. | |
193 | */ | |
194 | iscsi_tcp_segment_unmap(segment); | |
195 | ||
196 | if (!segment->data) { | |
197 | sg_init_table(&sg, 1); | |
198 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
199 | segment->copied + segment->sg_offset + | |
200 | segment->sg->offset); | |
201 | } else | |
202 | sg_init_one(&sg, segment->data + segment->copied, | |
203 | copied); | |
204 | crypto_hash_update(segment->hash, &sg, copied); | |
205 | } | |
206 | ||
207 | segment->copied += copied; | |
208 | if (segment->copied < segment->size) { | |
209 | iscsi_tcp_segment_map(segment, recv); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | segment->total_copied += segment->copied; | |
214 | segment->copied = 0; | |
215 | segment->size = 0; | |
216 | ||
217 | /* Unmap the current scatterlist page, if there is one. */ | |
218 | iscsi_tcp_segment_unmap(segment); | |
219 | ||
220 | /* Do we have more scatterlist entries? */ | |
0ab1c252 MC |
221 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n", |
222 | segment->total_copied, segment->total_size); | |
a081c13e MC |
223 | if (segment->total_copied < segment->total_size) { |
224 | /* Proceed to the next entry in the scatterlist. */ | |
225 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), | |
226 | 0); | |
227 | iscsi_tcp_segment_map(segment, recv); | |
228 | BUG_ON(segment->size == 0); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* Do we need to handle padding? */ | |
6df19a79 MC |
233 | if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) { |
234 | pad = iscsi_padding(segment->total_copied); | |
235 | if (pad != 0) { | |
0ab1c252 MC |
236 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
237 | "consume %d pad bytes\n", pad); | |
6df19a79 MC |
238 | segment->total_size += pad; |
239 | segment->size = pad; | |
2856830b | 240 | segment->data = segment->padbuf; |
6df19a79 MC |
241 | return 0; |
242 | } | |
a081c13e MC |
243 | } |
244 | ||
245 | /* | |
246 | * Set us up for transferring the data digest. hdr digest | |
247 | * is completely handled in hdr done function. | |
248 | */ | |
249 | if (segment->hash) { | |
250 | crypto_hash_final(segment->hash, segment->digest); | |
251 | iscsi_tcp_segment_splice_digest(segment, | |
252 | recv ? segment->recv_digest : segment->digest); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | return 1; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done); | |
259 | ||
260 | /** | |
261 | * iscsi_tcp_segment_recv - copy data to segment | |
262 | * @tcp_conn: the iSCSI TCP connection | |
263 | * @segment: the buffer to copy to | |
264 | * @ptr: data pointer | |
265 | * @len: amount of data available | |
266 | * | |
267 | * This function copies up to @len bytes to the | |
268 | * given buffer, and returns the number of bytes | |
269 | * consumed, which can actually be less than @len. | |
270 | * | |
271 | * If hash digest is enabled, the function will update the | |
272 | * hash while copying. | |
273 | * Combining these two operations doesn't buy us a lot (yet), | |
274 | * but in the future we could implement combined copy+crc, | |
275 | * just way we do for network layer checksums. | |
276 | */ | |
277 | static int | |
278 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, | |
279 | struct iscsi_segment *segment, const void *ptr, | |
280 | unsigned int len) | |
281 | { | |
282 | unsigned int copy = 0, copied = 0; | |
283 | ||
6df19a79 | 284 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) { |
a081c13e | 285 | if (copied == len) { |
0ab1c252 MC |
286 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
287 | "copied %d bytes\n", len); | |
a081c13e MC |
288 | break; |
289 | } | |
290 | ||
291 | copy = min(len - copied, segment->size - segment->copied); | |
0ab1c252 | 292 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy); |
a081c13e MC |
293 | memcpy(segment->data + segment->copied, ptr + copied, copy); |
294 | copied += copy; | |
295 | } | |
296 | return copied; | |
297 | } | |
298 | ||
299 | inline void | |
300 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
301 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
302 | { | |
303 | struct scatterlist sg; | |
304 | ||
305 | sg_init_one(&sg, hdr, hdrlen); | |
306 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header); | |
309 | ||
310 | static inline int | |
311 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
312 | struct iscsi_segment *segment) | |
313 | { | |
314 | if (!segment->digest_len) | |
315 | return 1; | |
316 | ||
317 | if (memcmp(segment->recv_digest, segment->digest, | |
318 | segment->digest_len)) { | |
0ab1c252 | 319 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n"); |
a081c13e MC |
320 | return 0; |
321 | } | |
322 | ||
323 | return 1; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Helper function to set up segment buffer | |
328 | */ | |
329 | static inline void | |
330 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, | |
331 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
332 | { | |
333 | memset(segment, 0, sizeof(*segment)); | |
334 | segment->total_size = size; | |
335 | segment->done = done; | |
336 | ||
337 | if (hash) { | |
338 | segment->hash = hash; | |
339 | crypto_hash_init(hash); | |
340 | } | |
341 | } | |
342 | ||
343 | inline void | |
344 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, | |
345 | size_t size, iscsi_segment_done_fn_t *done, | |
346 | struct hash_desc *hash) | |
347 | { | |
348 | __iscsi_segment_init(segment, size, done, hash); | |
349 | segment->data = data; | |
350 | segment->size = size; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(iscsi_segment_init_linear); | |
353 | ||
354 | inline int | |
355 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
356 | struct scatterlist *sg_list, unsigned int sg_count, | |
357 | unsigned int offset, size_t size, | |
358 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
359 | { | |
360 | struct scatterlist *sg; | |
361 | unsigned int i; | |
362 | ||
a081c13e MC |
363 | __iscsi_segment_init(segment, size, done, hash); |
364 | for_each_sg(sg_list, sg, sg_count, i) { | |
a081c13e MC |
365 | if (offset < sg->length) { |
366 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
367 | return 0; | |
368 | } | |
369 | offset -= sg->length; | |
370 | } | |
371 | ||
372 | return ISCSI_ERR_DATA_OFFSET; | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg); | |
375 | ||
376 | /** | |
377 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception | |
378 | * @tcp_conn: iscsi connection to prep for | |
379 | * | |
380 | * This function always passes NULL for the hash argument, because when this | |
381 | * function is called we do not yet know the final size of the header and want | |
382 | * to delay the digest processing until we know that. | |
383 | */ | |
384 | void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
385 | { | |
0ab1c252 MC |
386 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
387 | "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ? | |
388 | "digest enabled" : "digest disabled"); | |
a081c13e MC |
389 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
390 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
391 | iscsi_tcp_hdr_recv_done, NULL); | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep); | |
394 | ||
395 | /* | |
396 | * Handle incoming reply to any other type of command | |
397 | */ | |
398 | static int | |
399 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
400 | struct iscsi_segment *segment) | |
401 | { | |
402 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
403 | int rc = 0; | |
404 | ||
405 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
406 | return ISCSI_ERR_DATA_DGST; | |
407 | ||
408 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
409 | conn->data, tcp_conn->in.datalen); | |
410 | if (rc) | |
411 | return rc; | |
412 | ||
413 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void | |
418 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
419 | { | |
420 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
421 | struct hash_desc *rx_hash = NULL; | |
422 | ||
423 | if (conn->datadgst_en & | |
424 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
425 | rx_hash = tcp_conn->rx_hash; | |
426 | ||
427 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
428 | conn->data, tcp_conn->in.datalen, | |
429 | iscsi_tcp_data_recv_done, rx_hash); | |
430 | } | |
431 | ||
432 | /** | |
433 | * iscsi_tcp_cleanup_task - free tcp_task resources | |
434 | * @task: iscsi task | |
435 | * | |
436 | * must be called with session lock | |
437 | */ | |
438 | void iscsi_tcp_cleanup_task(struct iscsi_task *task) | |
439 | { | |
440 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
441 | struct iscsi_r2t_info *r2t; | |
442 | ||
443 | /* nothing to do for mgmt or pending tasks */ | |
444 | if (!task->sc || task->state == ISCSI_TASK_PENDING) | |
445 | return; | |
446 | ||
447 | /* flush task's r2t queues */ | |
448 | while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
449 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
450 | sizeof(void*)); | |
0ab1c252 | 451 | ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n"); |
a081c13e MC |
452 | } |
453 | ||
454 | r2t = tcp_task->r2t; | |
455 | if (r2t != NULL) { | |
456 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
457 | sizeof(void*)); | |
458 | tcp_task->r2t = NULL; | |
459 | } | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task); | |
462 | ||
463 | /** | |
464 | * iscsi_tcp_data_in - SCSI Data-In Response processing | |
465 | * @conn: iscsi connection | |
466 | * @task: scsi command task | |
467 | */ | |
468 | static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) | |
469 | { | |
470 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
471 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
472 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
473 | int datasn = be32_to_cpu(rhdr->datasn); | |
474 | unsigned total_in_length = scsi_in(task->sc)->length; | |
475 | ||
476 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr); | |
477 | if (tcp_conn->in.datalen == 0) | |
478 | return 0; | |
479 | ||
480 | if (tcp_task->exp_datasn != datasn) { | |
0ab1c252 MC |
481 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)" |
482 | "\n", tcp_task->exp_datasn, datasn); | |
a081c13e MC |
483 | return ISCSI_ERR_DATASN; |
484 | } | |
485 | ||
486 | tcp_task->exp_datasn++; | |
487 | ||
488 | tcp_task->data_offset = be32_to_cpu(rhdr->offset); | |
489 | if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) { | |
0ab1c252 MC |
490 | ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > " |
491 | "total_length_in(%d)\n", tcp_task->data_offset, | |
492 | tcp_conn->in.datalen, total_in_length); | |
a081c13e MC |
493 | return ISCSI_ERR_DATA_OFFSET; |
494 | } | |
495 | ||
496 | conn->datain_pdus_cnt++; | |
497 | return 0; | |
498 | } | |
499 | ||
500 | /** | |
501 | * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing | |
502 | * @conn: iscsi connection | |
503 | * @task: scsi command task | |
504 | */ | |
505 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) | |
506 | { | |
507 | struct iscsi_session *session = conn->session; | |
508 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
509 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
510 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
511 | struct iscsi_r2t_info *r2t; | |
512 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
513 | int rc; | |
514 | ||
515 | if (tcp_conn->in.datalen) { | |
516 | iscsi_conn_printk(KERN_ERR, conn, | |
517 | "invalid R2t with datalen %d\n", | |
518 | tcp_conn->in.datalen); | |
519 | return ISCSI_ERR_DATALEN; | |
520 | } | |
521 | ||
522 | if (tcp_task->exp_datasn != r2tsn){ | |
0ab1c252 MC |
523 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", |
524 | tcp_task->exp_datasn, r2tsn); | |
a081c13e MC |
525 | return ISCSI_ERR_R2TSN; |
526 | } | |
527 | ||
528 | /* fill-in new R2T associated with the task */ | |
529 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
530 | ||
531 | if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) { | |
532 | iscsi_conn_printk(KERN_INFO, conn, | |
533 | "dropping R2T itt %d in recovery.\n", | |
534 | task->itt); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | rc = __kfifo_get(tcp_task->r2tpool.queue, (void*)&r2t, sizeof(void*)); | |
539 | if (!rc) { | |
540 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
541 | "Target has sent more R2Ts than it " | |
542 | "negotiated for or driver has has leaked.\n"); | |
543 | return ISCSI_ERR_PROTO; | |
544 | } | |
545 | ||
546 | r2t->exp_statsn = rhdr->statsn; | |
547 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
548 | if (r2t->data_length == 0) { | |
549 | iscsi_conn_printk(KERN_ERR, conn, | |
550 | "invalid R2T with zero data len\n"); | |
551 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
552 | sizeof(void*)); | |
553 | return ISCSI_ERR_DATALEN; | |
554 | } | |
555 | ||
556 | if (r2t->data_length > session->max_burst) | |
0ab1c252 MC |
557 | ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max " |
558 | "burst %u. Attempting to execute request.\n", | |
559 | r2t->data_length, session->max_burst); | |
a081c13e MC |
560 | |
561 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
562 | if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) { | |
563 | iscsi_conn_printk(KERN_ERR, conn, | |
564 | "invalid R2T with data len %u at offset %u " | |
565 | "and total length %d\n", r2t->data_length, | |
566 | r2t->data_offset, scsi_out(task->sc)->length); | |
567 | __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t, | |
568 | sizeof(void*)); | |
569 | return ISCSI_ERR_DATALEN; | |
570 | } | |
571 | ||
572 | r2t->ttt = rhdr->ttt; /* no flip */ | |
573 | r2t->datasn = 0; | |
574 | r2t->sent = 0; | |
575 | ||
576 | tcp_task->exp_datasn = r2tsn + 1; | |
577 | __kfifo_put(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); | |
578 | conn->r2t_pdus_cnt++; | |
579 | ||
580 | iscsi_requeue_task(task); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Handle incoming reply to DataIn command | |
586 | */ | |
587 | static int | |
588 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
589 | struct iscsi_segment *segment) | |
590 | { | |
591 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
592 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
593 | int rc; | |
594 | ||
595 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
596 | return ISCSI_ERR_DATA_DGST; | |
597 | ||
598 | /* check for non-exceptional status */ | |
599 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
600 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
601 | if (rc) | |
602 | return rc; | |
603 | } | |
604 | ||
605 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
606 | return 0; | |
607 | } | |
608 | ||
609 | /** | |
610 | * iscsi_tcp_hdr_dissect - process PDU header | |
611 | * @conn: iSCSI connection | |
612 | * @hdr: PDU header | |
613 | * | |
614 | * This function analyzes the header of the PDU received, | |
615 | * and performs several sanity checks. If the PDU is accompanied | |
616 | * by data, the receive buffer is set up to copy the incoming data | |
617 | * to the correct location. | |
618 | */ | |
619 | static int | |
620 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
621 | { | |
622 | int rc = 0, opcode, ahslen; | |
623 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
624 | struct iscsi_task *task; | |
625 | ||
626 | /* verify PDU length */ | |
627 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
628 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
629 | iscsi_conn_printk(KERN_ERR, conn, | |
630 | "iscsi_tcp: datalen %d > %d\n", | |
631 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
632 | return ISCSI_ERR_DATALEN; | |
633 | } | |
634 | ||
635 | /* Additional header segments. So far, we don't | |
636 | * process additional headers. | |
637 | */ | |
638 | ahslen = hdr->hlength << 2; | |
639 | ||
640 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
641 | /* verify itt (itt encoding: age+cid+itt) */ | |
642 | rc = iscsi_verify_itt(conn, hdr->itt); | |
643 | if (rc) | |
644 | return rc; | |
645 | ||
0ab1c252 MC |
646 | ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n", |
647 | opcode, ahslen, tcp_conn->in.datalen); | |
a081c13e MC |
648 | |
649 | switch(opcode) { | |
650 | case ISCSI_OP_SCSI_DATA_IN: | |
651 | spin_lock(&conn->session->lock); | |
652 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
653 | if (!task) | |
654 | rc = ISCSI_ERR_BAD_ITT; | |
655 | else | |
656 | rc = iscsi_tcp_data_in(conn, task); | |
657 | if (rc) { | |
658 | spin_unlock(&conn->session->lock); | |
659 | break; | |
660 | } | |
661 | ||
662 | if (tcp_conn->in.datalen) { | |
663 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
664 | struct hash_desc *rx_hash = NULL; | |
665 | struct scsi_data_buffer *sdb = scsi_in(task->sc); | |
666 | ||
667 | /* | |
668 | * Setup copy of Data-In into the Scsi_Cmnd | |
669 | * Scatterlist case: | |
670 | * We set up the iscsi_segment to point to the next | |
671 | * scatterlist entry to copy to. As we go along, | |
672 | * we move on to the next scatterlist entry and | |
673 | * update the digest per-entry. | |
674 | */ | |
675 | if (conn->datadgst_en && | |
676 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
677 | rx_hash = tcp_conn->rx_hash; | |
678 | ||
0ab1c252 MC |
679 | ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( " |
680 | "offset=%d, datalen=%d)\n", | |
681 | tcp_task->data_offset, | |
682 | tcp_conn->in.datalen); | |
a081c13e MC |
683 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
684 | sdb->table.sgl, | |
685 | sdb->table.nents, | |
686 | tcp_task->data_offset, | |
687 | tcp_conn->in.datalen, | |
688 | iscsi_tcp_process_data_in, | |
689 | rx_hash); | |
690 | spin_unlock(&conn->session->lock); | |
691 | return rc; | |
692 | } | |
693 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
694 | spin_unlock(&conn->session->lock); | |
695 | break; | |
696 | case ISCSI_OP_SCSI_CMD_RSP: | |
697 | if (tcp_conn->in.datalen) { | |
698 | iscsi_tcp_data_recv_prep(tcp_conn); | |
699 | return 0; | |
700 | } | |
701 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
702 | break; | |
703 | case ISCSI_OP_R2T: | |
704 | spin_lock(&conn->session->lock); | |
705 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
706 | if (!task) | |
707 | rc = ISCSI_ERR_BAD_ITT; | |
708 | else if (ahslen) | |
709 | rc = ISCSI_ERR_AHSLEN; | |
710 | else if (task->sc->sc_data_direction == DMA_TO_DEVICE) | |
711 | rc = iscsi_tcp_r2t_rsp(conn, task); | |
712 | else | |
713 | rc = ISCSI_ERR_PROTO; | |
714 | spin_unlock(&conn->session->lock); | |
715 | break; | |
716 | case ISCSI_OP_LOGIN_RSP: | |
717 | case ISCSI_OP_TEXT_RSP: | |
718 | case ISCSI_OP_REJECT: | |
719 | case ISCSI_OP_ASYNC_EVENT: | |
720 | /* | |
721 | * It is possible that we could get a PDU with a buffer larger | |
722 | * than 8K, but there are no targets that currently do this. | |
723 | * For now we fail until we find a vendor that needs it | |
724 | */ | |
725 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
726 | iscsi_conn_printk(KERN_ERR, conn, | |
727 | "iscsi_tcp: received buffer of " | |
728 | "len %u but conn buffer is only %u " | |
729 | "(opcode %0x)\n", | |
730 | tcp_conn->in.datalen, | |
731 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
732 | rc = ISCSI_ERR_PROTO; | |
733 | break; | |
734 | } | |
735 | ||
736 | /* If there's data coming in with the response, | |
737 | * receive it to the connection's buffer. | |
738 | */ | |
739 | if (tcp_conn->in.datalen) { | |
740 | iscsi_tcp_data_recv_prep(tcp_conn); | |
741 | return 0; | |
742 | } | |
743 | /* fall through */ | |
744 | case ISCSI_OP_LOGOUT_RSP: | |
745 | case ISCSI_OP_NOOP_IN: | |
746 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
747 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
748 | break; | |
749 | default: | |
750 | rc = ISCSI_ERR_BAD_OPCODE; | |
751 | break; | |
752 | } | |
753 | ||
754 | if (rc == 0) { | |
755 | /* Anything that comes with data should have | |
756 | * been handled above. */ | |
757 | if (tcp_conn->in.datalen) | |
758 | return ISCSI_ERR_PROTO; | |
759 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
760 | } | |
761 | ||
762 | return rc; | |
763 | } | |
764 | ||
765 | /** | |
766 | * iscsi_tcp_hdr_recv_done - process PDU header | |
767 | * | |
768 | * This is the callback invoked when the PDU header has | |
769 | * been received. If the header is followed by additional | |
770 | * header segments, we go back for more data. | |
771 | */ | |
772 | static int | |
773 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
774 | struct iscsi_segment *segment) | |
775 | { | |
776 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
777 | struct iscsi_hdr *hdr; | |
778 | ||
779 | /* Check if there are additional header segments | |
780 | * *prior* to computing the digest, because we | |
781 | * may need to go back to the caller for more. | |
782 | */ | |
783 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
784 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
785 | /* Bump the header length - the caller will | |
786 | * just loop around and get the AHS for us, and | |
787 | * call again. */ | |
788 | unsigned int ahslen = hdr->hlength << 2; | |
789 | ||
790 | /* Make sure we don't overflow */ | |
791 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
792 | return ISCSI_ERR_AHSLEN; | |
793 | ||
794 | segment->total_size += ahslen; | |
795 | segment->size += ahslen; | |
796 | return 0; | |
797 | } | |
798 | ||
799 | /* We're done processing the header. See if we're doing | |
800 | * header digests; if so, set up the recv_digest buffer | |
801 | * and go back for more. */ | |
6df19a79 MC |
802 | if (conn->hdrdgst_en && |
803 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { | |
a081c13e MC |
804 | if (segment->digest_len == 0) { |
805 | /* | |
806 | * Even if we offload the digest processing we | |
807 | * splice it in so we can increment the skb/segment | |
808 | * counters in preparation for the data segment. | |
809 | */ | |
810 | iscsi_tcp_segment_splice_digest(segment, | |
811 | segment->recv_digest); | |
812 | return 0; | |
813 | } | |
814 | ||
6df19a79 MC |
815 | iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr, |
816 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
817 | segment->digest); | |
a081c13e | 818 | |
6df19a79 MC |
819 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
820 | return ISCSI_ERR_HDR_DGST; | |
a081c13e MC |
821 | } |
822 | ||
823 | tcp_conn->in.hdr = hdr; | |
824 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
825 | } | |
826 | ||
827 | /** | |
828 | * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header | |
829 | * @tcp_conn: iscsi tcp conn | |
830 | * | |
831 | * returns non zero if we are currently processing or setup to process | |
832 | * a header. | |
833 | */ | |
834 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) | |
835 | { | |
836 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
837 | } | |
838 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr); | |
839 | ||
840 | /** | |
841 | * iscsi_tcp_recv_skb - Process skb | |
842 | * @conn: iscsi connection | |
843 | * @skb: network buffer with header and/or data segment | |
844 | * @offset: offset in skb | |
845 | * @offload: bool indicating if transfer was offloaded | |
846 | * | |
847 | * Will return status of transfer in status. And will return | |
848 | * number of bytes copied. | |
849 | */ | |
850 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
851 | unsigned int offset, bool offloaded, int *status) | |
852 | { | |
853 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
854 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
855 | struct skb_seq_state seq; | |
856 | unsigned int consumed = 0; | |
857 | int rc = 0; | |
858 | ||
0ab1c252 | 859 | ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset); |
a081c13e MC |
860 | |
861 | if (unlikely(conn->suspend_rx)) { | |
0ab1c252 | 862 | ISCSI_DBG_TCP(conn, "Rx suspended!\n"); |
a081c13e MC |
863 | *status = ISCSI_TCP_SUSPENDED; |
864 | return 0; | |
865 | } | |
866 | ||
867 | if (offloaded) { | |
868 | segment->total_copied = segment->total_size; | |
869 | goto segment_done; | |
870 | } | |
871 | ||
872 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
873 | while (1) { | |
874 | unsigned int avail; | |
875 | const u8 *ptr; | |
876 | ||
877 | avail = skb_seq_read(consumed, &ptr, &seq); | |
878 | if (avail == 0) { | |
0ab1c252 MC |
879 | ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", |
880 | consumed); | |
a081c13e MC |
881 | *status = ISCSI_TCP_SKB_DONE; |
882 | skb_abort_seq_read(&seq); | |
883 | goto skb_done; | |
884 | } | |
885 | BUG_ON(segment->copied >= segment->size); | |
886 | ||
0ab1c252 MC |
887 | ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr, |
888 | avail); | |
a081c13e MC |
889 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
890 | BUG_ON(rc == 0); | |
891 | consumed += rc; | |
892 | ||
893 | if (segment->total_copied >= segment->total_size) { | |
894 | skb_abort_seq_read(&seq); | |
895 | goto segment_done; | |
896 | } | |
897 | } | |
898 | ||
899 | segment_done: | |
900 | *status = ISCSI_TCP_SEGMENT_DONE; | |
0ab1c252 | 901 | ISCSI_DBG_TCP(conn, "segment done\n"); |
a081c13e MC |
902 | rc = segment->done(tcp_conn, segment); |
903 | if (rc != 0) { | |
904 | *status = ISCSI_TCP_CONN_ERR; | |
0ab1c252 | 905 | ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc); |
a081c13e MC |
906 | iscsi_conn_failure(conn, rc); |
907 | return 0; | |
908 | } | |
909 | /* The done() functions sets up the next segment. */ | |
910 | ||
911 | skb_done: | |
912 | conn->rxdata_octets += consumed; | |
913 | return consumed; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
916 | ||
917 | /** | |
918 | * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
919 | * @conn: iscsi connection | |
920 | * @task: scsi command task | |
921 | * @sc: scsi command | |
922 | */ | |
923 | int iscsi_tcp_task_init(struct iscsi_task *task) | |
924 | { | |
925 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
926 | struct iscsi_conn *conn = task->conn; | |
927 | struct scsi_cmnd *sc = task->sc; | |
928 | int err; | |
929 | ||
930 | if (!sc) { | |
931 | /* | |
932 | * mgmt tasks do not have a scatterlist since they come | |
933 | * in from the iscsi interface. | |
934 | */ | |
0ab1c252 | 935 | ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt); |
a081c13e MC |
936 | |
937 | return conn->session->tt->init_pdu(task, 0, task->data_count); | |
938 | } | |
939 | ||
940 | BUG_ON(__kfifo_len(tcp_task->r2tqueue)); | |
941 | tcp_task->exp_datasn = 0; | |
942 | ||
943 | /* Prepare PDU, optionally w/ immediate data */ | |
0ab1c252 MC |
944 | ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n", |
945 | task->itt, task->imm_count, task->unsol_r2t.data_length); | |
a081c13e MC |
946 | |
947 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); | |
948 | if (err) | |
949 | return err; | |
950 | task->imm_count = 0; | |
951 | return 0; | |
952 | } | |
953 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_init); | |
954 | ||
955 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) | |
956 | { | |
957 | struct iscsi_session *session = task->conn->session; | |
958 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
959 | struct iscsi_r2t_info *r2t = NULL; | |
960 | ||
961 | if (iscsi_task_has_unsol_data(task)) | |
962 | r2t = &task->unsol_r2t; | |
963 | else { | |
964 | spin_lock_bh(&session->lock); | |
965 | if (tcp_task->r2t) { | |
966 | r2t = tcp_task->r2t; | |
967 | /* Continue with this R2T? */ | |
968 | if (r2t->data_length <= r2t->sent) { | |
0ab1c252 MC |
969 | ISCSI_DBG_TCP(task->conn, |
970 | " done with r2t %p\n", r2t); | |
a081c13e MC |
971 | __kfifo_put(tcp_task->r2tpool.queue, |
972 | (void *)&tcp_task->r2t, | |
973 | sizeof(void *)); | |
974 | tcp_task->r2t = r2t = NULL; | |
975 | } | |
976 | } | |
977 | ||
978 | if (r2t == NULL) { | |
979 | __kfifo_get(tcp_task->r2tqueue, | |
980 | (void *)&tcp_task->r2t, sizeof(void *)); | |
981 | r2t = tcp_task->r2t; | |
982 | } | |
983 | spin_unlock_bh(&session->lock); | |
984 | } | |
985 | ||
986 | return r2t; | |
987 | } | |
988 | ||
989 | /** | |
990 | * iscsi_tcp_task_xmit - xmit normal PDU task | |
991 | * @task: iscsi command task | |
992 | * | |
993 | * We're expected to return 0 when everything was transmitted succesfully, | |
994 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind | |
995 | * of error. | |
996 | */ | |
997 | int iscsi_tcp_task_xmit(struct iscsi_task *task) | |
998 | { | |
999 | struct iscsi_conn *conn = task->conn; | |
1000 | struct iscsi_session *session = conn->session; | |
1001 | struct iscsi_r2t_info *r2t; | |
1002 | int rc = 0; | |
1003 | ||
1004 | flush: | |
1005 | /* Flush any pending data first. */ | |
1006 | rc = session->tt->xmit_pdu(task); | |
1007 | if (rc < 0) | |
1008 | return rc; | |
1009 | ||
1010 | /* mgmt command */ | |
1011 | if (!task->sc) { | |
1012 | if (task->hdr->itt == RESERVED_ITT) | |
1013 | iscsi_put_task(task); | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /* Are we done already? */ | |
1018 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) | |
1019 | return 0; | |
1020 | ||
1021 | r2t = iscsi_tcp_get_curr_r2t(task); | |
1022 | if (r2t == NULL) { | |
1023 | /* Waiting for more R2Ts to arrive. */ | |
0ab1c252 | 1024 | ISCSI_DBG_TCP(conn, "no R2Ts yet\n"); |
a081c13e MC |
1025 | return 0; |
1026 | } | |
1027 | ||
2ff79d52 | 1028 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT); |
a081c13e MC |
1029 | if (rc) |
1030 | return rc; | |
1031 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
1032 | ||
0ab1c252 MC |
1033 | ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1034 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1035 | r2t->data_offset + r2t->sent, r2t->data_count); | |
a081c13e MC |
1036 | |
1037 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, | |
1038 | r2t->data_count); | |
9a6510eb MC |
1039 | if (rc) { |
1040 | iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED); | |
a081c13e | 1041 | return rc; |
9a6510eb MC |
1042 | } |
1043 | ||
a081c13e MC |
1044 | r2t->sent += r2t->data_count; |
1045 | goto flush; | |
1046 | } | |
1047 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit); | |
1048 | ||
1049 | struct iscsi_cls_conn * | |
1050 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
1051 | uint32_t conn_idx) | |
1052 | ||
1053 | { | |
1054 | struct iscsi_conn *conn; | |
1055 | struct iscsi_cls_conn *cls_conn; | |
1056 | struct iscsi_tcp_conn *tcp_conn; | |
1057 | ||
1058 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx); | |
1059 | if (!cls_conn) | |
1060 | return NULL; | |
1061 | conn = cls_conn->dd_data; | |
1062 | /* | |
1063 | * due to strange issues with iser these are not set | |
1064 | * in iscsi_conn_setup | |
1065 | */ | |
1066 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1067 | ||
1068 | tcp_conn = conn->dd_data; | |
1069 | tcp_conn->iscsi_conn = conn; | |
1070 | ||
1071 | tcp_conn->dd_data = kzalloc(dd_data_size, GFP_KERNEL); | |
1072 | if (!tcp_conn->dd_data) { | |
1073 | iscsi_conn_teardown(cls_conn); | |
1074 | return NULL; | |
1075 | } | |
1076 | return cls_conn; | |
1077 | } | |
1078 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup); | |
1079 | ||
1080 | void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1081 | { | |
1082 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1083 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1084 | ||
1085 | kfree(tcp_conn->dd_data); | |
1086 | iscsi_conn_teardown(cls_conn); | |
1087 | } | |
1088 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown); | |
1089 | ||
1090 | int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session) | |
1091 | { | |
1092 | int i; | |
1093 | int cmd_i; | |
1094 | ||
1095 | /* | |
1096 | * initialize per-task: R2T pool and xmit queue | |
1097 | */ | |
1098 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1099 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1100 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1101 | ||
1102 | /* | |
1103 | * pre-allocated x2 as much r2ts to handle race when | |
1104 | * target acks DataOut faster than we data_xmit() queues | |
1105 | * could replenish r2tqueue. | |
1106 | */ | |
1107 | ||
1108 | /* R2T pool */ | |
1109 | if (iscsi_pool_init(&tcp_task->r2tpool, | |
1110 | session->max_r2t * 2, NULL, | |
1111 | sizeof(struct iscsi_r2t_info))) { | |
1112 | goto r2t_alloc_fail; | |
1113 | } | |
1114 | ||
1115 | /* R2T xmit queue */ | |
1116 | tcp_task->r2tqueue = kfifo_alloc( | |
1117 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); | |
1118 | if (tcp_task->r2tqueue == ERR_PTR(-ENOMEM)) { | |
1119 | iscsi_pool_free(&tcp_task->r2tpool); | |
1120 | goto r2t_alloc_fail; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | return 0; | |
1125 | ||
1126 | r2t_alloc_fail: | |
1127 | for (i = 0; i < cmd_i; i++) { | |
1128 | struct iscsi_task *task = session->cmds[i]; | |
1129 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1130 | ||
1131 | kfifo_free(tcp_task->r2tqueue); | |
1132 | iscsi_pool_free(&tcp_task->r2tpool); | |
1133 | } | |
1134 | return -ENOMEM; | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc); | |
1137 | ||
1138 | void iscsi_tcp_r2tpool_free(struct iscsi_session *session) | |
1139 | { | |
1140 | int i; | |
1141 | ||
1142 | for (i = 0; i < session->cmds_max; i++) { | |
1143 | struct iscsi_task *task = session->cmds[i]; | |
1144 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1145 | ||
1146 | kfifo_free(tcp_task->r2tqueue); | |
1147 | iscsi_pool_free(&tcp_task->r2tpool); | |
1148 | } | |
1149 | } | |
1150 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free); | |
1151 | ||
1152 | void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, | |
1153 | struct iscsi_stats *stats) | |
1154 | { | |
1155 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1156 | ||
1157 | stats->txdata_octets = conn->txdata_octets; | |
1158 | stats->rxdata_octets = conn->rxdata_octets; | |
1159 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1160 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1161 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1162 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1163 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1164 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1165 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats); |