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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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
a081c13e MC |
33 | #include <linux/file.h> |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/crypto.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/kfifo.h> | |
38 | #include <linux/scatterlist.h> | |
39 | #include <net/tcp.h> | |
40 | #include <scsi/scsi_cmnd.h> | |
41 | #include <scsi/scsi_device.h> | |
42 | #include <scsi/scsi_host.h> | |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_transport_iscsi.h> | |
45 | ||
46 | #include "iscsi_tcp.h" | |
47 | ||
48 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " | |
49 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
50 | "Alex Aizman <itn780@yahoo.com>"); | |
51 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
52 | MODULE_LICENSE("GPL"); | |
a081c13e | 53 | |
0ab1c252 MC |
54 | static int iscsi_dbg_libtcp; |
55 | module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int, | |
56 | S_IRUGO | S_IWUSR); | |
57 | MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp " | |
58 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
59 | "is off."); | |
60 | ||
61 | #define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...) \ | |
62 | do { \ | |
63 | if (iscsi_dbg_libtcp) \ | |
64 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
65 | "%s " dbg_fmt, \ | |
66 | __func__, ##arg); \ | |
67 | } while (0); | |
a081c13e MC |
68 | |
69 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
70 | struct iscsi_segment *segment); | |
71 | ||
72 | /* | |
73 | * Scatterlist handling: inside the iscsi_segment, we | |
74 | * remember an index into the scatterlist, and set data/size | |
75 | * to the current scatterlist entry. For highmem pages, we | |
76 | * kmap as needed. | |
77 | * | |
78 | * Note that the page is unmapped when we return from | |
79 | * TCP's data_ready handler, so we may end up mapping and | |
80 | * unmapping the same page repeatedly. The whole reason | |
81 | * for this is that we shouldn't keep the page mapped | |
82 | * outside the softirq. | |
83 | */ | |
84 | ||
85 | /** | |
86 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry | |
87 | * @segment: the buffer object | |
88 | * @sg: scatterlist | |
89 | * @offset: byte offset into that sg entry | |
90 | * | |
91 | * This function sets up the segment so that subsequent | |
92 | * data is copied to the indicated sg entry, at the given | |
93 | * offset. | |
94 | */ | |
95 | static inline void | |
96 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, | |
97 | struct scatterlist *sg, unsigned int offset) | |
98 | { | |
99 | segment->sg = sg; | |
100 | segment->sg_offset = offset; | |
101 | segment->size = min(sg->length - offset, | |
102 | segment->total_size - segment->total_copied); | |
103 | segment->data = NULL; | |
104 | } | |
105 | ||
106 | /** | |
107 | * iscsi_tcp_segment_map - map the current S/G page | |
108 | * @segment: iscsi_segment | |
109 | * @recv: 1 if called from recv path | |
110 | * | |
111 | * We only need to possibly kmap data if scatter lists are being used, | |
112 | * because the iscsi passthrough and internal IO paths will never use high | |
113 | * mem pages. | |
114 | */ | |
115 | static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) | |
116 | { | |
117 | struct scatterlist *sg; | |
118 | ||
119 | if (segment->data != NULL || !segment->sg) | |
120 | return; | |
121 | ||
122 | sg = segment->sg; | |
123 | BUG_ON(segment->sg_mapped); | |
124 | BUG_ON(sg->length == 0); | |
125 | ||
126 | /* | |
127 | * If the page count is greater than one it is ok to send | |
128 | * to the network layer's zero copy send path. If not we | |
129 | * have to go the slow sendmsg path. We always map for the | |
130 | * recv path. | |
131 | */ | |
132 | if (page_count(sg_page(sg)) >= 1 && !recv) | |
133 | return; | |
134 | ||
a081c13e MC |
135 | segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0); |
136 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; | |
137 | } | |
138 | ||
139 | void iscsi_tcp_segment_unmap(struct iscsi_segment *segment) | |
140 | { | |
a081c13e | 141 | if (segment->sg_mapped) { |
a081c13e MC |
142 | kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0); |
143 | segment->sg_mapped = NULL; | |
144 | segment->data = NULL; | |
145 | } | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap); | |
148 | ||
149 | /* | |
150 | * Splice the digest buffer into the buffer | |
151 | */ | |
152 | static inline void | |
153 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) | |
154 | { | |
155 | segment->data = digest; | |
156 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
157 | segment->total_size += ISCSI_DIGEST_SIZE; | |
158 | segment->size = ISCSI_DIGEST_SIZE; | |
159 | segment->copied = 0; | |
160 | segment->sg = NULL; | |
161 | segment->hash = NULL; | |
162 | } | |
163 | ||
164 | /** | |
165 | * iscsi_tcp_segment_done - check whether the segment is complete | |
6df19a79 | 166 | * @tcp_conn: iscsi tcp connection |
a081c13e MC |
167 | * @segment: iscsi segment to check |
168 | * @recv: set to one of this is called from the recv path | |
169 | * @copied: number of bytes copied | |
170 | * | |
171 | * Check if we're done receiving this segment. If the receive | |
172 | * buffer is full but we expect more data, move on to the | |
173 | * next entry in the scatterlist. | |
174 | * | |
175 | * If the amount of data we received isn't a multiple of 4, | |
176 | * we will transparently receive the pad bytes, too. | |
177 | * | |
178 | * This function must be re-entrant. | |
179 | */ | |
6df19a79 MC |
180 | int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
181 | struct iscsi_segment *segment, int recv, | |
a081c13e MC |
182 | unsigned copied) |
183 | { | |
a081c13e MC |
184 | struct scatterlist sg; |
185 | unsigned int pad; | |
186 | ||
0ab1c252 MC |
187 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n", |
188 | segment->copied, copied, segment->size, | |
189 | recv ? "recv" : "xmit"); | |
a081c13e MC |
190 | if (segment->hash && copied) { |
191 | /* | |
192 | * If a segment is kmapd we must unmap it before sending | |
193 | * to the crypto layer since that will try to kmap it again. | |
194 | */ | |
195 | iscsi_tcp_segment_unmap(segment); | |
196 | ||
197 | if (!segment->data) { | |
198 | sg_init_table(&sg, 1); | |
199 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
200 | segment->copied + segment->sg_offset + | |
201 | segment->sg->offset); | |
202 | } else | |
203 | sg_init_one(&sg, segment->data + segment->copied, | |
204 | copied); | |
205 | crypto_hash_update(segment->hash, &sg, copied); | |
206 | } | |
207 | ||
208 | segment->copied += copied; | |
209 | if (segment->copied < segment->size) { | |
210 | iscsi_tcp_segment_map(segment, recv); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | segment->total_copied += segment->copied; | |
215 | segment->copied = 0; | |
216 | segment->size = 0; | |
217 | ||
218 | /* Unmap the current scatterlist page, if there is one. */ | |
219 | iscsi_tcp_segment_unmap(segment); | |
220 | ||
221 | /* Do we have more scatterlist entries? */ | |
0ab1c252 MC |
222 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n", |
223 | segment->total_copied, segment->total_size); | |
a081c13e MC |
224 | if (segment->total_copied < segment->total_size) { |
225 | /* Proceed to the next entry in the scatterlist. */ | |
226 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), | |
227 | 0); | |
228 | iscsi_tcp_segment_map(segment, recv); | |
229 | BUG_ON(segment->size == 0); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* Do we need to handle padding? */ | |
6df19a79 MC |
234 | if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) { |
235 | pad = iscsi_padding(segment->total_copied); | |
236 | if (pad != 0) { | |
0ab1c252 MC |
237 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
238 | "consume %d pad bytes\n", pad); | |
6df19a79 MC |
239 | segment->total_size += pad; |
240 | segment->size = pad; | |
2856830b | 241 | segment->data = segment->padbuf; |
6df19a79 MC |
242 | return 0; |
243 | } | |
a081c13e MC |
244 | } |
245 | ||
246 | /* | |
247 | * Set us up for transferring the data digest. hdr digest | |
248 | * is completely handled in hdr done function. | |
249 | */ | |
250 | if (segment->hash) { | |
251 | crypto_hash_final(segment->hash, segment->digest); | |
252 | iscsi_tcp_segment_splice_digest(segment, | |
253 | recv ? segment->recv_digest : segment->digest); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | return 1; | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done); | |
260 | ||
261 | /** | |
262 | * iscsi_tcp_segment_recv - copy data to segment | |
263 | * @tcp_conn: the iSCSI TCP connection | |
264 | * @segment: the buffer to copy to | |
265 | * @ptr: data pointer | |
266 | * @len: amount of data available | |
267 | * | |
268 | * This function copies up to @len bytes to the | |
269 | * given buffer, and returns the number of bytes | |
270 | * consumed, which can actually be less than @len. | |
271 | * | |
272 | * If hash digest is enabled, the function will update the | |
273 | * hash while copying. | |
274 | * Combining these two operations doesn't buy us a lot (yet), | |
275 | * but in the future we could implement combined copy+crc, | |
276 | * just way we do for network layer checksums. | |
277 | */ | |
278 | static int | |
279 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, | |
280 | struct iscsi_segment *segment, const void *ptr, | |
281 | unsigned int len) | |
282 | { | |
283 | unsigned int copy = 0, copied = 0; | |
284 | ||
6df19a79 | 285 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) { |
a081c13e | 286 | if (copied == len) { |
0ab1c252 MC |
287 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
288 | "copied %d bytes\n", len); | |
a081c13e MC |
289 | break; |
290 | } | |
291 | ||
292 | copy = min(len - copied, segment->size - segment->copied); | |
0ab1c252 | 293 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy); |
a081c13e MC |
294 | memcpy(segment->data + segment->copied, ptr + copied, copy); |
295 | copied += copy; | |
296 | } | |
297 | return copied; | |
298 | } | |
299 | ||
300 | inline void | |
301 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
302 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
303 | { | |
304 | struct scatterlist sg; | |
305 | ||
306 | sg_init_one(&sg, hdr, hdrlen); | |
307 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header); | |
310 | ||
311 | static inline int | |
312 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
313 | struct iscsi_segment *segment) | |
314 | { | |
315 | if (!segment->digest_len) | |
316 | return 1; | |
317 | ||
318 | if (memcmp(segment->recv_digest, segment->digest, | |
319 | segment->digest_len)) { | |
0ab1c252 | 320 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n"); |
a081c13e MC |
321 | return 0; |
322 | } | |
323 | ||
324 | return 1; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Helper function to set up segment buffer | |
329 | */ | |
330 | static inline void | |
331 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, | |
332 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
333 | { | |
334 | memset(segment, 0, sizeof(*segment)); | |
335 | segment->total_size = size; | |
336 | segment->done = done; | |
337 | ||
338 | if (hash) { | |
339 | segment->hash = hash; | |
340 | crypto_hash_init(hash); | |
341 | } | |
342 | } | |
343 | ||
344 | inline void | |
345 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, | |
346 | size_t size, iscsi_segment_done_fn_t *done, | |
347 | struct hash_desc *hash) | |
348 | { | |
349 | __iscsi_segment_init(segment, size, done, hash); | |
350 | segment->data = data; | |
351 | segment->size = size; | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(iscsi_segment_init_linear); | |
354 | ||
355 | inline int | |
356 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
357 | struct scatterlist *sg_list, unsigned int sg_count, | |
358 | unsigned int offset, size_t size, | |
359 | iscsi_segment_done_fn_t *done, struct hash_desc *hash) | |
360 | { | |
361 | struct scatterlist *sg; | |
362 | unsigned int i; | |
363 | ||
a081c13e MC |
364 | __iscsi_segment_init(segment, size, done, hash); |
365 | for_each_sg(sg_list, sg, sg_count, i) { | |
a081c13e MC |
366 | if (offset < sg->length) { |
367 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
368 | return 0; | |
369 | } | |
370 | offset -= sg->length; | |
371 | } | |
372 | ||
373 | return ISCSI_ERR_DATA_OFFSET; | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg); | |
376 | ||
377 | /** | |
378 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception | |
379 | * @tcp_conn: iscsi connection to prep for | |
380 | * | |
381 | * This function always passes NULL for the hash argument, because when this | |
382 | * function is called we do not yet know the final size of the header and want | |
383 | * to delay the digest processing until we know that. | |
384 | */ | |
385 | void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
386 | { | |
0ab1c252 MC |
387 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
388 | "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ? | |
389 | "digest enabled" : "digest disabled"); | |
a081c13e MC |
390 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
391 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
392 | iscsi_tcp_hdr_recv_done, NULL); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep); | |
395 | ||
396 | /* | |
397 | * Handle incoming reply to any other type of command | |
398 | */ | |
399 | static int | |
400 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
401 | struct iscsi_segment *segment) | |
402 | { | |
403 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
404 | int rc = 0; | |
405 | ||
406 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
407 | return ISCSI_ERR_DATA_DGST; | |
408 | ||
409 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
410 | conn->data, tcp_conn->in.datalen); | |
411 | if (rc) | |
412 | return rc; | |
413 | ||
414 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static void | |
419 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
420 | { | |
421 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
422 | struct hash_desc *rx_hash = NULL; | |
423 | ||
ef7d17a9 | 424 | if (conn->datadgst_en && |
a081c13e MC |
425 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) |
426 | rx_hash = tcp_conn->rx_hash; | |
427 | ||
428 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
429 | conn->data, tcp_conn->in.datalen, | |
430 | iscsi_tcp_data_recv_done, rx_hash); | |
431 | } | |
432 | ||
433 | /** | |
434 | * iscsi_tcp_cleanup_task - free tcp_task resources | |
435 | * @task: iscsi task | |
436 | * | |
437 | * must be called with session lock | |
438 | */ | |
439 | void iscsi_tcp_cleanup_task(struct iscsi_task *task) | |
440 | { | |
441 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
442 | struct iscsi_r2t_info *r2t; | |
443 | ||
b3cd5050 MC |
444 | /* nothing to do for mgmt */ |
445 | if (!task->sc) | |
a081c13e MC |
446 | return; |
447 | ||
448 | /* flush task's r2t queues */ | |
7acd72eb SS |
449 | while (kfifo_out(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) { |
450 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, | |
a081c13e | 451 | sizeof(void*)); |
0ab1c252 | 452 | ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n"); |
a081c13e MC |
453 | } |
454 | ||
455 | r2t = tcp_task->r2t; | |
456 | if (r2t != NULL) { | |
7acd72eb | 457 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, |
a081c13e MC |
458 | sizeof(void*)); |
459 | tcp_task->r2t = NULL; | |
460 | } | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task); | |
463 | ||
464 | /** | |
465 | * iscsi_tcp_data_in - SCSI Data-In Response processing | |
466 | * @conn: iscsi connection | |
467 | * @task: scsi command task | |
468 | */ | |
469 | static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) | |
470 | { | |
471 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
472 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
473 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
474 | int datasn = be32_to_cpu(rhdr->datasn); | |
475 | unsigned total_in_length = scsi_in(task->sc)->length; | |
476 | ||
edbc9aa0 MC |
477 | /* |
478 | * lib iscsi will update this in the completion handling if there | |
479 | * is status. | |
480 | */ | |
481 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
482 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr); | |
483 | ||
a081c13e MC |
484 | if (tcp_conn->in.datalen == 0) |
485 | return 0; | |
486 | ||
487 | if (tcp_task->exp_datasn != datasn) { | |
0ab1c252 MC |
488 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)" |
489 | "\n", tcp_task->exp_datasn, datasn); | |
a081c13e MC |
490 | return ISCSI_ERR_DATASN; |
491 | } | |
492 | ||
493 | tcp_task->exp_datasn++; | |
494 | ||
495 | tcp_task->data_offset = be32_to_cpu(rhdr->offset); | |
496 | if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) { | |
0ab1c252 MC |
497 | ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > " |
498 | "total_length_in(%d)\n", tcp_task->data_offset, | |
499 | tcp_conn->in.datalen, total_in_length); | |
a081c13e MC |
500 | return ISCSI_ERR_DATA_OFFSET; |
501 | } | |
502 | ||
503 | conn->datain_pdus_cnt++; | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /** | |
508 | * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing | |
509 | * @conn: iscsi connection | |
510 | * @task: scsi command task | |
511 | */ | |
512 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) | |
513 | { | |
514 | struct iscsi_session *session = conn->session; | |
515 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
516 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
517 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
518 | struct iscsi_r2t_info *r2t; | |
519 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
520 | int rc; | |
521 | ||
522 | if (tcp_conn->in.datalen) { | |
523 | iscsi_conn_printk(KERN_ERR, conn, | |
524 | "invalid R2t with datalen %d\n", | |
525 | tcp_conn->in.datalen); | |
526 | return ISCSI_ERR_DATALEN; | |
527 | } | |
528 | ||
529 | if (tcp_task->exp_datasn != r2tsn){ | |
0ab1c252 MC |
530 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", |
531 | tcp_task->exp_datasn, r2tsn); | |
a081c13e MC |
532 | return ISCSI_ERR_R2TSN; |
533 | } | |
534 | ||
535 | /* fill-in new R2T associated with the task */ | |
536 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
537 | ||
538 | if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) { | |
539 | iscsi_conn_printk(KERN_INFO, conn, | |
540 | "dropping R2T itt %d in recovery.\n", | |
541 | task->itt); | |
542 | return 0; | |
543 | } | |
544 | ||
7acd72eb | 545 | rc = kfifo_out(&tcp_task->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
a081c13e MC |
546 | if (!rc) { |
547 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
548 | "Target has sent more R2Ts than it " | |
549 | "negotiated for or driver has has leaked.\n"); | |
550 | return ISCSI_ERR_PROTO; | |
551 | } | |
552 | ||
553 | r2t->exp_statsn = rhdr->statsn; | |
554 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
555 | if (r2t->data_length == 0) { | |
556 | iscsi_conn_printk(KERN_ERR, conn, | |
557 | "invalid R2T with zero data len\n"); | |
7acd72eb | 558 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, |
a081c13e MC |
559 | sizeof(void*)); |
560 | return ISCSI_ERR_DATALEN; | |
561 | } | |
562 | ||
563 | if (r2t->data_length > session->max_burst) | |
0ab1c252 MC |
564 | ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max " |
565 | "burst %u. Attempting to execute request.\n", | |
566 | r2t->data_length, session->max_burst); | |
a081c13e MC |
567 | |
568 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
569 | if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) { | |
570 | iscsi_conn_printk(KERN_ERR, conn, | |
571 | "invalid R2T with data len %u at offset %u " | |
572 | "and total length %d\n", r2t->data_length, | |
573 | r2t->data_offset, scsi_out(task->sc)->length); | |
7acd72eb | 574 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, |
a081c13e MC |
575 | sizeof(void*)); |
576 | return ISCSI_ERR_DATALEN; | |
577 | } | |
578 | ||
579 | r2t->ttt = rhdr->ttt; /* no flip */ | |
580 | r2t->datasn = 0; | |
581 | r2t->sent = 0; | |
582 | ||
583 | tcp_task->exp_datasn = r2tsn + 1; | |
7acd72eb | 584 | kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); |
a081c13e MC |
585 | conn->r2t_pdus_cnt++; |
586 | ||
587 | iscsi_requeue_task(task); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Handle incoming reply to DataIn command | |
593 | */ | |
594 | static int | |
595 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
596 | struct iscsi_segment *segment) | |
597 | { | |
598 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
599 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
600 | int rc; | |
601 | ||
602 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
603 | return ISCSI_ERR_DATA_DGST; | |
604 | ||
605 | /* check for non-exceptional status */ | |
606 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
607 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
608 | if (rc) | |
609 | return rc; | |
610 | } | |
611 | ||
612 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /** | |
617 | * iscsi_tcp_hdr_dissect - process PDU header | |
618 | * @conn: iSCSI connection | |
619 | * @hdr: PDU header | |
620 | * | |
621 | * This function analyzes the header of the PDU received, | |
622 | * and performs several sanity checks. If the PDU is accompanied | |
623 | * by data, the receive buffer is set up to copy the incoming data | |
624 | * to the correct location. | |
625 | */ | |
626 | static int | |
627 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
628 | { | |
629 | int rc = 0, opcode, ahslen; | |
630 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
631 | struct iscsi_task *task; | |
632 | ||
633 | /* verify PDU length */ | |
634 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
635 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
636 | iscsi_conn_printk(KERN_ERR, conn, | |
637 | "iscsi_tcp: datalen %d > %d\n", | |
638 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
639 | return ISCSI_ERR_DATALEN; | |
640 | } | |
641 | ||
642 | /* Additional header segments. So far, we don't | |
643 | * process additional headers. | |
644 | */ | |
645 | ahslen = hdr->hlength << 2; | |
646 | ||
647 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
648 | /* verify itt (itt encoding: age+cid+itt) */ | |
649 | rc = iscsi_verify_itt(conn, hdr->itt); | |
650 | if (rc) | |
651 | return rc; | |
652 | ||
0ab1c252 MC |
653 | ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n", |
654 | opcode, ahslen, tcp_conn->in.datalen); | |
a081c13e MC |
655 | |
656 | switch(opcode) { | |
657 | case ISCSI_OP_SCSI_DATA_IN: | |
658 | spin_lock(&conn->session->lock); | |
659 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
660 | if (!task) | |
661 | rc = ISCSI_ERR_BAD_ITT; | |
662 | else | |
663 | rc = iscsi_tcp_data_in(conn, task); | |
664 | if (rc) { | |
665 | spin_unlock(&conn->session->lock); | |
666 | break; | |
667 | } | |
668 | ||
669 | if (tcp_conn->in.datalen) { | |
670 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
671 | struct hash_desc *rx_hash = NULL; | |
672 | struct scsi_data_buffer *sdb = scsi_in(task->sc); | |
673 | ||
674 | /* | |
675 | * Setup copy of Data-In into the Scsi_Cmnd | |
676 | * Scatterlist case: | |
677 | * We set up the iscsi_segment to point to the next | |
678 | * scatterlist entry to copy to. As we go along, | |
679 | * we move on to the next scatterlist entry and | |
680 | * update the digest per-entry. | |
681 | */ | |
682 | if (conn->datadgst_en && | |
683 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
684 | rx_hash = tcp_conn->rx_hash; | |
685 | ||
0ab1c252 MC |
686 | ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( " |
687 | "offset=%d, datalen=%d)\n", | |
688 | tcp_task->data_offset, | |
689 | tcp_conn->in.datalen); | |
d355e57d | 690 | task->last_xfer = jiffies; |
a081c13e MC |
691 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
692 | sdb->table.sgl, | |
693 | sdb->table.nents, | |
694 | tcp_task->data_offset, | |
695 | tcp_conn->in.datalen, | |
696 | iscsi_tcp_process_data_in, | |
697 | rx_hash); | |
698 | spin_unlock(&conn->session->lock); | |
699 | return rc; | |
700 | } | |
701 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
702 | spin_unlock(&conn->session->lock); | |
703 | break; | |
704 | case ISCSI_OP_SCSI_CMD_RSP: | |
705 | if (tcp_conn->in.datalen) { | |
706 | iscsi_tcp_data_recv_prep(tcp_conn); | |
707 | return 0; | |
708 | } | |
709 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
710 | break; | |
711 | case ISCSI_OP_R2T: | |
712 | spin_lock(&conn->session->lock); | |
713 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
714 | if (!task) | |
715 | rc = ISCSI_ERR_BAD_ITT; | |
716 | else if (ahslen) | |
717 | rc = ISCSI_ERR_AHSLEN; | |
d355e57d MC |
718 | else if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
719 | task->last_xfer = jiffies; | |
a081c13e | 720 | rc = iscsi_tcp_r2t_rsp(conn, task); |
d355e57d | 721 | } else |
a081c13e MC |
722 | rc = ISCSI_ERR_PROTO; |
723 | spin_unlock(&conn->session->lock); | |
724 | break; | |
725 | case ISCSI_OP_LOGIN_RSP: | |
726 | case ISCSI_OP_TEXT_RSP: | |
727 | case ISCSI_OP_REJECT: | |
728 | case ISCSI_OP_ASYNC_EVENT: | |
729 | /* | |
730 | * It is possible that we could get a PDU with a buffer larger | |
731 | * than 8K, but there are no targets that currently do this. | |
732 | * For now we fail until we find a vendor that needs it | |
733 | */ | |
734 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
735 | iscsi_conn_printk(KERN_ERR, conn, | |
736 | "iscsi_tcp: received buffer of " | |
737 | "len %u but conn buffer is only %u " | |
738 | "(opcode %0x)\n", | |
739 | tcp_conn->in.datalen, | |
740 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
741 | rc = ISCSI_ERR_PROTO; | |
742 | break; | |
743 | } | |
744 | ||
745 | /* If there's data coming in with the response, | |
746 | * receive it to the connection's buffer. | |
747 | */ | |
748 | if (tcp_conn->in.datalen) { | |
749 | iscsi_tcp_data_recv_prep(tcp_conn); | |
750 | return 0; | |
751 | } | |
752 | /* fall through */ | |
753 | case ISCSI_OP_LOGOUT_RSP: | |
754 | case ISCSI_OP_NOOP_IN: | |
755 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
756 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
757 | break; | |
758 | default: | |
759 | rc = ISCSI_ERR_BAD_OPCODE; | |
760 | break; | |
761 | } | |
762 | ||
763 | if (rc == 0) { | |
764 | /* Anything that comes with data should have | |
765 | * been handled above. */ | |
766 | if (tcp_conn->in.datalen) | |
767 | return ISCSI_ERR_PROTO; | |
768 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
769 | } | |
770 | ||
771 | return rc; | |
772 | } | |
773 | ||
774 | /** | |
775 | * iscsi_tcp_hdr_recv_done - process PDU header | |
776 | * | |
777 | * This is the callback invoked when the PDU header has | |
778 | * been received. If the header is followed by additional | |
779 | * header segments, we go back for more data. | |
780 | */ | |
781 | static int | |
782 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
783 | struct iscsi_segment *segment) | |
784 | { | |
785 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
786 | struct iscsi_hdr *hdr; | |
787 | ||
788 | /* Check if there are additional header segments | |
789 | * *prior* to computing the digest, because we | |
790 | * may need to go back to the caller for more. | |
791 | */ | |
792 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
793 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
794 | /* Bump the header length - the caller will | |
795 | * just loop around and get the AHS for us, and | |
796 | * call again. */ | |
797 | unsigned int ahslen = hdr->hlength << 2; | |
798 | ||
799 | /* Make sure we don't overflow */ | |
800 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
801 | return ISCSI_ERR_AHSLEN; | |
802 | ||
803 | segment->total_size += ahslen; | |
804 | segment->size += ahslen; | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /* We're done processing the header. See if we're doing | |
809 | * header digests; if so, set up the recv_digest buffer | |
810 | * and go back for more. */ | |
6df19a79 MC |
811 | if (conn->hdrdgst_en && |
812 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { | |
a081c13e MC |
813 | if (segment->digest_len == 0) { |
814 | /* | |
815 | * Even if we offload the digest processing we | |
816 | * splice it in so we can increment the skb/segment | |
817 | * counters in preparation for the data segment. | |
818 | */ | |
819 | iscsi_tcp_segment_splice_digest(segment, | |
820 | segment->recv_digest); | |
821 | return 0; | |
822 | } | |
823 | ||
6df19a79 MC |
824 | iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr, |
825 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
826 | segment->digest); | |
a081c13e | 827 | |
6df19a79 MC |
828 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
829 | return ISCSI_ERR_HDR_DGST; | |
a081c13e MC |
830 | } |
831 | ||
832 | tcp_conn->in.hdr = hdr; | |
833 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
834 | } | |
835 | ||
836 | /** | |
837 | * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header | |
838 | * @tcp_conn: iscsi tcp conn | |
839 | * | |
840 | * returns non zero if we are currently processing or setup to process | |
841 | * a header. | |
842 | */ | |
843 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) | |
844 | { | |
845 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr); | |
848 | ||
849 | /** | |
850 | * iscsi_tcp_recv_skb - Process skb | |
851 | * @conn: iscsi connection | |
852 | * @skb: network buffer with header and/or data segment | |
853 | * @offset: offset in skb | |
854 | * @offload: bool indicating if transfer was offloaded | |
855 | * | |
856 | * Will return status of transfer in status. And will return | |
857 | * number of bytes copied. | |
858 | */ | |
859 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
860 | unsigned int offset, bool offloaded, int *status) | |
861 | { | |
862 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
863 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
864 | struct skb_seq_state seq; | |
865 | unsigned int consumed = 0; | |
866 | int rc = 0; | |
867 | ||
0ab1c252 | 868 | ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset); |
d1acfae5 MC |
869 | /* |
870 | * Update for each skb instead of pdu, because over slow networks a | |
871 | * data_in's data could take a while to read in. We also want to | |
872 | * account for r2ts. | |
873 | */ | |
874 | conn->last_recv = jiffies; | |
a081c13e MC |
875 | |
876 | if (unlikely(conn->suspend_rx)) { | |
0ab1c252 | 877 | ISCSI_DBG_TCP(conn, "Rx suspended!\n"); |
a081c13e MC |
878 | *status = ISCSI_TCP_SUSPENDED; |
879 | return 0; | |
880 | } | |
881 | ||
882 | if (offloaded) { | |
883 | segment->total_copied = segment->total_size; | |
884 | goto segment_done; | |
885 | } | |
886 | ||
887 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
888 | while (1) { | |
889 | unsigned int avail; | |
890 | const u8 *ptr; | |
891 | ||
892 | avail = skb_seq_read(consumed, &ptr, &seq); | |
893 | if (avail == 0) { | |
0ab1c252 MC |
894 | ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", |
895 | consumed); | |
a081c13e MC |
896 | *status = ISCSI_TCP_SKB_DONE; |
897 | skb_abort_seq_read(&seq); | |
898 | goto skb_done; | |
899 | } | |
900 | BUG_ON(segment->copied >= segment->size); | |
901 | ||
0ab1c252 MC |
902 | ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr, |
903 | avail); | |
a081c13e MC |
904 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
905 | BUG_ON(rc == 0); | |
906 | consumed += rc; | |
907 | ||
908 | if (segment->total_copied >= segment->total_size) { | |
909 | skb_abort_seq_read(&seq); | |
910 | goto segment_done; | |
911 | } | |
912 | } | |
913 | ||
914 | segment_done: | |
915 | *status = ISCSI_TCP_SEGMENT_DONE; | |
0ab1c252 | 916 | ISCSI_DBG_TCP(conn, "segment done\n"); |
a081c13e MC |
917 | rc = segment->done(tcp_conn, segment); |
918 | if (rc != 0) { | |
919 | *status = ISCSI_TCP_CONN_ERR; | |
0ab1c252 | 920 | ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc); |
a081c13e MC |
921 | iscsi_conn_failure(conn, rc); |
922 | return 0; | |
923 | } | |
924 | /* The done() functions sets up the next segment. */ | |
925 | ||
926 | skb_done: | |
927 | conn->rxdata_octets += consumed; | |
928 | return consumed; | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
931 | ||
932 | /** | |
933 | * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
934 | * @conn: iscsi connection | |
935 | * @task: scsi command task | |
936 | * @sc: scsi command | |
937 | */ | |
938 | int iscsi_tcp_task_init(struct iscsi_task *task) | |
939 | { | |
940 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
941 | struct iscsi_conn *conn = task->conn; | |
942 | struct scsi_cmnd *sc = task->sc; | |
943 | int err; | |
944 | ||
945 | if (!sc) { | |
946 | /* | |
947 | * mgmt tasks do not have a scatterlist since they come | |
948 | * in from the iscsi interface. | |
949 | */ | |
0ab1c252 | 950 | ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt); |
a081c13e MC |
951 | |
952 | return conn->session->tt->init_pdu(task, 0, task->data_count); | |
953 | } | |
954 | ||
e64c026d | 955 | BUG_ON(kfifo_len(&tcp_task->r2tqueue)); |
a081c13e MC |
956 | tcp_task->exp_datasn = 0; |
957 | ||
958 | /* Prepare PDU, optionally w/ immediate data */ | |
0ab1c252 MC |
959 | ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n", |
960 | task->itt, task->imm_count, task->unsol_r2t.data_length); | |
a081c13e MC |
961 | |
962 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); | |
963 | if (err) | |
964 | return err; | |
965 | task->imm_count = 0; | |
966 | return 0; | |
967 | } | |
968 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_init); | |
969 | ||
970 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) | |
971 | { | |
972 | struct iscsi_session *session = task->conn->session; | |
973 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
974 | struct iscsi_r2t_info *r2t = NULL; | |
975 | ||
976 | if (iscsi_task_has_unsol_data(task)) | |
977 | r2t = &task->unsol_r2t; | |
978 | else { | |
979 | spin_lock_bh(&session->lock); | |
980 | if (tcp_task->r2t) { | |
981 | r2t = tcp_task->r2t; | |
982 | /* Continue with this R2T? */ | |
983 | if (r2t->data_length <= r2t->sent) { | |
0ab1c252 MC |
984 | ISCSI_DBG_TCP(task->conn, |
985 | " done with r2t %p\n", r2t); | |
7acd72eb | 986 | kfifo_in(&tcp_task->r2tpool.queue, |
a081c13e MC |
987 | (void *)&tcp_task->r2t, |
988 | sizeof(void *)); | |
989 | tcp_task->r2t = r2t = NULL; | |
990 | } | |
991 | } | |
992 | ||
993 | if (r2t == NULL) { | |
9842c38e SS |
994 | if (kfifo_out(&tcp_task->r2tqueue, |
995 | (void *)&tcp_task->r2t, sizeof(void *)) != | |
fee099b2 | 996 | sizeof(void *)) |
9842c38e | 997 | r2t = NULL; |
fee099b2 MC |
998 | else |
999 | r2t = tcp_task->r2t; | |
a081c13e MC |
1000 | } |
1001 | spin_unlock_bh(&session->lock); | |
1002 | } | |
1003 | ||
1004 | return r2t; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * iscsi_tcp_task_xmit - xmit normal PDU task | |
1009 | * @task: iscsi command task | |
1010 | * | |
af901ca1 | 1011 | * We're expected to return 0 when everything was transmitted successfully, |
a081c13e MC |
1012 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind |
1013 | * of error. | |
1014 | */ | |
1015 | int iscsi_tcp_task_xmit(struct iscsi_task *task) | |
1016 | { | |
1017 | struct iscsi_conn *conn = task->conn; | |
1018 | struct iscsi_session *session = conn->session; | |
1019 | struct iscsi_r2t_info *r2t; | |
1020 | int rc = 0; | |
1021 | ||
1022 | flush: | |
1023 | /* Flush any pending data first. */ | |
1024 | rc = session->tt->xmit_pdu(task); | |
1025 | if (rc < 0) | |
1026 | return rc; | |
1027 | ||
1028 | /* mgmt command */ | |
1029 | if (!task->sc) { | |
1030 | if (task->hdr->itt == RESERVED_ITT) | |
1031 | iscsi_put_task(task); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* Are we done already? */ | |
1036 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) | |
1037 | return 0; | |
1038 | ||
1039 | r2t = iscsi_tcp_get_curr_r2t(task); | |
1040 | if (r2t == NULL) { | |
1041 | /* Waiting for more R2Ts to arrive. */ | |
0ab1c252 | 1042 | ISCSI_DBG_TCP(conn, "no R2Ts yet\n"); |
a081c13e MC |
1043 | return 0; |
1044 | } | |
1045 | ||
2ff79d52 | 1046 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT); |
a081c13e MC |
1047 | if (rc) |
1048 | return rc; | |
1049 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
1050 | ||
0ab1c252 MC |
1051 | ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1052 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1053 | r2t->data_offset + r2t->sent, r2t->data_count); | |
a081c13e MC |
1054 | |
1055 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, | |
1056 | r2t->data_count); | |
9a6510eb MC |
1057 | if (rc) { |
1058 | iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED); | |
a081c13e | 1059 | return rc; |
9a6510eb MC |
1060 | } |
1061 | ||
a081c13e MC |
1062 | r2t->sent += r2t->data_count; |
1063 | goto flush; | |
1064 | } | |
1065 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit); | |
1066 | ||
1067 | struct iscsi_cls_conn * | |
1068 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
1069 | uint32_t conn_idx) | |
1070 | ||
1071 | { | |
1072 | struct iscsi_conn *conn; | |
1073 | struct iscsi_cls_conn *cls_conn; | |
1074 | struct iscsi_tcp_conn *tcp_conn; | |
1075 | ||
1076 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx); | |
1077 | if (!cls_conn) | |
1078 | return NULL; | |
1079 | conn = cls_conn->dd_data; | |
1080 | /* | |
1081 | * due to strange issues with iser these are not set | |
1082 | * in iscsi_conn_setup | |
1083 | */ | |
1084 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1085 | ||
1086 | tcp_conn = conn->dd_data; | |
1087 | tcp_conn->iscsi_conn = conn; | |
1088 | ||
1089 | tcp_conn->dd_data = kzalloc(dd_data_size, GFP_KERNEL); | |
1090 | if (!tcp_conn->dd_data) { | |
1091 | iscsi_conn_teardown(cls_conn); | |
1092 | return NULL; | |
1093 | } | |
1094 | return cls_conn; | |
1095 | } | |
1096 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup); | |
1097 | ||
1098 | void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1099 | { | |
1100 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1101 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1102 | ||
1103 | kfree(tcp_conn->dd_data); | |
1104 | iscsi_conn_teardown(cls_conn); | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown); | |
1107 | ||
1108 | int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session) | |
1109 | { | |
1110 | int i; | |
1111 | int cmd_i; | |
1112 | ||
1113 | /* | |
1114 | * initialize per-task: R2T pool and xmit queue | |
1115 | */ | |
1116 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1117 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1118 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1119 | ||
1120 | /* | |
1121 | * pre-allocated x2 as much r2ts to handle race when | |
1122 | * target acks DataOut faster than we data_xmit() queues | |
1123 | * could replenish r2tqueue. | |
1124 | */ | |
1125 | ||
1126 | /* R2T pool */ | |
1127 | if (iscsi_pool_init(&tcp_task->r2tpool, | |
1128 | session->max_r2t * 2, NULL, | |
1129 | sizeof(struct iscsi_r2t_info))) { | |
1130 | goto r2t_alloc_fail; | |
1131 | } | |
1132 | ||
1133 | /* R2T xmit queue */ | |
45465487 | 1134 | if (kfifo_alloc(&tcp_task->r2tqueue, |
c1e13f25 | 1135 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) { |
a081c13e MC |
1136 | iscsi_pool_free(&tcp_task->r2tpool); |
1137 | goto r2t_alloc_fail; | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | ||
1143 | r2t_alloc_fail: | |
1144 | for (i = 0; i < cmd_i; i++) { | |
1145 | struct iscsi_task *task = session->cmds[i]; | |
1146 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1147 | ||
45465487 | 1148 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1149 | iscsi_pool_free(&tcp_task->r2tpool); |
1150 | } | |
1151 | return -ENOMEM; | |
1152 | } | |
1153 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc); | |
1154 | ||
1155 | void iscsi_tcp_r2tpool_free(struct iscsi_session *session) | |
1156 | { | |
1157 | int i; | |
1158 | ||
1159 | for (i = 0; i < session->cmds_max; i++) { | |
1160 | struct iscsi_task *task = session->cmds[i]; | |
1161 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1162 | ||
45465487 | 1163 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1164 | iscsi_pool_free(&tcp_task->r2tpool); |
1165 | } | |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free); | |
1168 | ||
1169 | void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, | |
1170 | struct iscsi_stats *stats) | |
1171 | { | |
1172 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1173 | ||
1174 | stats->txdata_octets = conn->txdata_octets; | |
1175 | stats->rxdata_octets = conn->rxdata_octets; | |
1176 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1177 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1178 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1179 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1180 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1181 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1182 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats); |