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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 | ||
5d6ac29b | 29 | #include <crypto/hash.h> |
a081c13e MC |
30 | #include <linux/types.h> |
31 | #include <linux/list.h> | |
32 | #include <linux/inet.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
a081c13e MC |
34 | #include <linux/file.h> |
35 | #include <linux/blkdev.h> | |
a081c13e MC |
36 | #include <linux/delay.h> |
37 | #include <linux/kfifo.h> | |
38 | #include <linux/scatterlist.h> | |
acf3368f | 39 | #include <linux/module.h> |
a081c13e MC |
40 | #include <net/tcp.h> |
41 | #include <scsi/scsi_cmnd.h> | |
42 | #include <scsi/scsi_device.h> | |
43 | #include <scsi/scsi_host.h> | |
44 | #include <scsi/scsi.h> | |
45 | #include <scsi/scsi_transport_iscsi.h> | |
c2332b00 | 46 | #include <trace/events/iscsi.h> |
a081c13e MC |
47 | |
48 | #include "iscsi_tcp.h" | |
49 | ||
50 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " | |
51 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
52 | "Alex Aizman <itn780@yahoo.com>"); | |
53 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
54 | MODULE_LICENSE("GPL"); | |
a081c13e | 55 | |
0ab1c252 MC |
56 | static int iscsi_dbg_libtcp; |
57 | module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int, | |
58 | S_IRUGO | S_IWUSR); | |
59 | MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp " | |
60 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
61 | "is off."); | |
62 | ||
63 | #define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...) \ | |
64 | do { \ | |
65 | if (iscsi_dbg_libtcp) \ | |
66 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
67 | "%s " dbg_fmt, \ | |
68 | __func__, ##arg); \ | |
c2332b00 FH |
69 | iscsi_dbg_trace(trace_iscsi_dbg_tcp, \ |
70 | &(_conn)->cls_conn->dev, \ | |
71 | "%s " dbg_fmt, __func__, ##arg);\ | |
0ab1c252 | 72 | } while (0); |
a081c13e MC |
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 void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) | |
121 | { | |
122 | struct scatterlist *sg; | |
123 | ||
124 | if (segment->data != NULL || !segment->sg) | |
125 | return; | |
126 | ||
127 | sg = segment->sg; | |
128 | BUG_ON(segment->sg_mapped); | |
129 | BUG_ON(sg->length == 0); | |
130 | ||
131 | /* | |
08b11eac VA |
132 | * We always map for the recv path. |
133 | * | |
a081c13e MC |
134 | * If the page count is greater than one it is ok to send |
135 | * to the network layer's zero copy send path. If not we | |
08b11eac VA |
136 | * have to go the slow sendmsg path. |
137 | * | |
138 | * Same goes for slab pages: skb_can_coalesce() allows | |
139 | * coalescing neighboring slab objects into a single frag which | |
140 | * triggers one of hardened usercopy checks. | |
a081c13e | 141 | */ |
08b11eac | 142 | if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg))) |
a081c13e MC |
143 | return; |
144 | ||
70c7c88a MC |
145 | if (recv) { |
146 | segment->atomic_mapped = true; | |
77dfce07 | 147 | segment->sg_mapped = kmap_atomic(sg_page(sg)); |
70c7c88a MC |
148 | } else { |
149 | segment->atomic_mapped = false; | |
150 | /* the xmit path can sleep with the page mapped so use kmap */ | |
151 | segment->sg_mapped = kmap(sg_page(sg)); | |
152 | } | |
153 | ||
a081c13e MC |
154 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; |
155 | } | |
156 | ||
157 | void iscsi_tcp_segment_unmap(struct iscsi_segment *segment) | |
158 | { | |
a081c13e | 159 | if (segment->sg_mapped) { |
70c7c88a | 160 | if (segment->atomic_mapped) |
77dfce07 | 161 | kunmap_atomic(segment->sg_mapped); |
70c7c88a MC |
162 | else |
163 | kunmap(sg_page(segment->sg)); | |
a081c13e MC |
164 | segment->sg_mapped = NULL; |
165 | segment->data = NULL; | |
166 | } | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap); | |
169 | ||
170 | /* | |
171 | * Splice the digest buffer into the buffer | |
172 | */ | |
173 | static inline void | |
174 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) | |
175 | { | |
176 | segment->data = digest; | |
177 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
178 | segment->total_size += ISCSI_DIGEST_SIZE; | |
179 | segment->size = ISCSI_DIGEST_SIZE; | |
180 | segment->copied = 0; | |
181 | segment->sg = NULL; | |
182 | segment->hash = NULL; | |
183 | } | |
184 | ||
185 | /** | |
186 | * iscsi_tcp_segment_done - check whether the segment is complete | |
6df19a79 | 187 | * @tcp_conn: iscsi tcp connection |
a081c13e MC |
188 | * @segment: iscsi segment to check |
189 | * @recv: set to one of this is called from the recv path | |
190 | * @copied: number of bytes copied | |
191 | * | |
192 | * Check if we're done receiving this segment. If the receive | |
193 | * buffer is full but we expect more data, move on to the | |
194 | * next entry in the scatterlist. | |
195 | * | |
196 | * If the amount of data we received isn't a multiple of 4, | |
197 | * we will transparently receive the pad bytes, too. | |
198 | * | |
199 | * This function must be re-entrant. | |
200 | */ | |
6df19a79 MC |
201 | int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
202 | struct iscsi_segment *segment, int recv, | |
a081c13e MC |
203 | unsigned copied) |
204 | { | |
a081c13e MC |
205 | struct scatterlist sg; |
206 | unsigned int pad; | |
207 | ||
0ab1c252 MC |
208 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n", |
209 | segment->copied, copied, segment->size, | |
210 | recv ? "recv" : "xmit"); | |
a081c13e MC |
211 | if (segment->hash && copied) { |
212 | /* | |
213 | * If a segment is kmapd we must unmap it before sending | |
214 | * to the crypto layer since that will try to kmap it again. | |
215 | */ | |
216 | iscsi_tcp_segment_unmap(segment); | |
217 | ||
218 | if (!segment->data) { | |
219 | sg_init_table(&sg, 1); | |
220 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
221 | segment->copied + segment->sg_offset + | |
222 | segment->sg->offset); | |
223 | } else | |
224 | sg_init_one(&sg, segment->data + segment->copied, | |
225 | copied); | |
5d6ac29b HX |
226 | ahash_request_set_crypt(segment->hash, &sg, NULL, copied); |
227 | crypto_ahash_update(segment->hash); | |
a081c13e MC |
228 | } |
229 | ||
230 | segment->copied += copied; | |
231 | if (segment->copied < segment->size) { | |
232 | iscsi_tcp_segment_map(segment, recv); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | segment->total_copied += segment->copied; | |
237 | segment->copied = 0; | |
238 | segment->size = 0; | |
239 | ||
240 | /* Unmap the current scatterlist page, if there is one. */ | |
241 | iscsi_tcp_segment_unmap(segment); | |
242 | ||
243 | /* Do we have more scatterlist entries? */ | |
0ab1c252 MC |
244 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n", |
245 | segment->total_copied, segment->total_size); | |
a081c13e MC |
246 | if (segment->total_copied < segment->total_size) { |
247 | /* Proceed to the next entry in the scatterlist. */ | |
248 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), | |
249 | 0); | |
250 | iscsi_tcp_segment_map(segment, recv); | |
251 | BUG_ON(segment->size == 0); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* Do we need to handle padding? */ | |
6df19a79 MC |
256 | if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) { |
257 | pad = iscsi_padding(segment->total_copied); | |
258 | if (pad != 0) { | |
0ab1c252 MC |
259 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
260 | "consume %d pad bytes\n", pad); | |
6df19a79 MC |
261 | segment->total_size += pad; |
262 | segment->size = pad; | |
2856830b | 263 | segment->data = segment->padbuf; |
6df19a79 MC |
264 | return 0; |
265 | } | |
a081c13e MC |
266 | } |
267 | ||
268 | /* | |
269 | * Set us up for transferring the data digest. hdr digest | |
270 | * is completely handled in hdr done function. | |
271 | */ | |
272 | if (segment->hash) { | |
5d6ac29b HX |
273 | ahash_request_set_crypt(segment->hash, NULL, |
274 | segment->digest, 0); | |
275 | crypto_ahash_final(segment->hash); | |
a081c13e MC |
276 | iscsi_tcp_segment_splice_digest(segment, |
277 | recv ? segment->recv_digest : segment->digest); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | return 1; | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done); | |
284 | ||
285 | /** | |
286 | * iscsi_tcp_segment_recv - copy data to segment | |
287 | * @tcp_conn: the iSCSI TCP connection | |
288 | * @segment: the buffer to copy to | |
289 | * @ptr: data pointer | |
290 | * @len: amount of data available | |
291 | * | |
292 | * This function copies up to @len bytes to the | |
293 | * given buffer, and returns the number of bytes | |
294 | * consumed, which can actually be less than @len. | |
295 | * | |
296 | * If hash digest is enabled, the function will update the | |
297 | * hash while copying. | |
298 | * Combining these two operations doesn't buy us a lot (yet), | |
299 | * but in the future we could implement combined copy+crc, | |
300 | * just way we do for network layer checksums. | |
301 | */ | |
302 | static int | |
303 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, | |
304 | struct iscsi_segment *segment, const void *ptr, | |
305 | unsigned int len) | |
306 | { | |
307 | unsigned int copy = 0, copied = 0; | |
308 | ||
6df19a79 | 309 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) { |
a081c13e | 310 | if (copied == len) { |
0ab1c252 MC |
311 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
312 | "copied %d bytes\n", len); | |
a081c13e MC |
313 | break; |
314 | } | |
315 | ||
316 | copy = min(len - copied, segment->size - segment->copied); | |
0ab1c252 | 317 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy); |
a081c13e MC |
318 | memcpy(segment->data + segment->copied, ptr + copied, copy); |
319 | copied += copy; | |
320 | } | |
321 | return copied; | |
322 | } | |
323 | ||
324 | inline void | |
5d6ac29b HX |
325 | iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr, |
326 | size_t hdrlen, unsigned char digest[ISCSI_DIGEST_SIZE]) | |
a081c13e MC |
327 | { |
328 | struct scatterlist sg; | |
329 | ||
330 | sg_init_one(&sg, hdr, hdrlen); | |
5d6ac29b HX |
331 | ahash_request_set_crypt(hash, &sg, digest, hdrlen); |
332 | crypto_ahash_digest(hash); | |
a081c13e MC |
333 | } |
334 | EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header); | |
335 | ||
336 | static inline int | |
337 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
338 | struct iscsi_segment *segment) | |
339 | { | |
340 | if (!segment->digest_len) | |
341 | return 1; | |
342 | ||
343 | if (memcmp(segment->recv_digest, segment->digest, | |
344 | segment->digest_len)) { | |
0ab1c252 | 345 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n"); |
a081c13e MC |
346 | return 0; |
347 | } | |
348 | ||
349 | return 1; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Helper function to set up segment buffer | |
354 | */ | |
355 | static inline void | |
356 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, | |
5d6ac29b | 357 | iscsi_segment_done_fn_t *done, struct ahash_request *hash) |
a081c13e MC |
358 | { |
359 | memset(segment, 0, sizeof(*segment)); | |
360 | segment->total_size = size; | |
361 | segment->done = done; | |
362 | ||
363 | if (hash) { | |
364 | segment->hash = hash; | |
5d6ac29b | 365 | crypto_ahash_init(hash); |
a081c13e MC |
366 | } |
367 | } | |
368 | ||
369 | inline void | |
370 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, | |
371 | size_t size, iscsi_segment_done_fn_t *done, | |
5d6ac29b | 372 | struct ahash_request *hash) |
a081c13e MC |
373 | { |
374 | __iscsi_segment_init(segment, size, done, hash); | |
375 | segment->data = data; | |
376 | segment->size = size; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(iscsi_segment_init_linear); | |
379 | ||
380 | inline int | |
381 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
382 | struct scatterlist *sg_list, unsigned int sg_count, | |
383 | unsigned int offset, size_t size, | |
5d6ac29b HX |
384 | iscsi_segment_done_fn_t *done, |
385 | struct ahash_request *hash) | |
a081c13e MC |
386 | { |
387 | struct scatterlist *sg; | |
388 | unsigned int i; | |
389 | ||
a081c13e MC |
390 | __iscsi_segment_init(segment, size, done, hash); |
391 | for_each_sg(sg_list, sg, sg_count, i) { | |
a081c13e MC |
392 | if (offset < sg->length) { |
393 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
394 | return 0; | |
395 | } | |
396 | offset -= sg->length; | |
397 | } | |
398 | ||
399 | return ISCSI_ERR_DATA_OFFSET; | |
400 | } | |
401 | EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg); | |
402 | ||
403 | /** | |
404 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception | |
405 | * @tcp_conn: iscsi connection to prep for | |
406 | * | |
407 | * This function always passes NULL for the hash argument, because when this | |
408 | * function is called we do not yet know the final size of the header and want | |
409 | * to delay the digest processing until we know that. | |
410 | */ | |
411 | void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
412 | { | |
0ab1c252 MC |
413 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
414 | "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ? | |
415 | "digest enabled" : "digest disabled"); | |
a081c13e MC |
416 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
417 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
418 | iscsi_tcp_hdr_recv_done, NULL); | |
419 | } | |
420 | EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep); | |
421 | ||
422 | /* | |
423 | * Handle incoming reply to any other type of command | |
424 | */ | |
425 | static int | |
426 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
427 | struct iscsi_segment *segment) | |
428 | { | |
429 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
430 | int rc = 0; | |
431 | ||
432 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
433 | return ISCSI_ERR_DATA_DGST; | |
434 | ||
435 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
436 | conn->data, tcp_conn->in.datalen); | |
437 | if (rc) | |
438 | return rc; | |
439 | ||
440 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static void | |
445 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
446 | { | |
447 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
5d6ac29b | 448 | struct ahash_request *rx_hash = NULL; |
a081c13e | 449 | |
ef7d17a9 | 450 | if (conn->datadgst_en && |
a081c13e MC |
451 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) |
452 | rx_hash = tcp_conn->rx_hash; | |
453 | ||
454 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
455 | conn->data, tcp_conn->in.datalen, | |
456 | iscsi_tcp_data_recv_done, rx_hash); | |
457 | } | |
458 | ||
459 | /** | |
460 | * iscsi_tcp_cleanup_task - free tcp_task resources | |
461 | * @task: iscsi task | |
462 | * | |
659743b0 | 463 | * must be called with session back_lock |
a081c13e MC |
464 | */ |
465 | void iscsi_tcp_cleanup_task(struct iscsi_task *task) | |
466 | { | |
467 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
468 | struct iscsi_r2t_info *r2t; | |
469 | ||
b3cd5050 MC |
470 | /* nothing to do for mgmt */ |
471 | if (!task->sc) | |
a081c13e MC |
472 | return; |
473 | ||
659743b0 | 474 | spin_lock_bh(&tcp_task->queue2pool); |
a081c13e | 475 | /* flush task's r2t queues */ |
7acd72eb SS |
476 | while (kfifo_out(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) { |
477 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, | |
a081c13e | 478 | sizeof(void*)); |
0ab1c252 | 479 | ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n"); |
a081c13e MC |
480 | } |
481 | ||
482 | r2t = tcp_task->r2t; | |
483 | if (r2t != NULL) { | |
7acd72eb | 484 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, |
a081c13e MC |
485 | sizeof(void*)); |
486 | tcp_task->r2t = NULL; | |
487 | } | |
659743b0 | 488 | spin_unlock_bh(&tcp_task->queue2pool); |
a081c13e MC |
489 | } |
490 | EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task); | |
491 | ||
492 | /** | |
493 | * iscsi_tcp_data_in - SCSI Data-In Response processing | |
494 | * @conn: iscsi connection | |
495 | * @task: scsi command task | |
496 | */ | |
497 | static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) | |
498 | { | |
499 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
500 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
501 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
502 | int datasn = be32_to_cpu(rhdr->datasn); | |
ae3d56d8 | 503 | unsigned total_in_length = task->sc->sdb.length; |
a081c13e | 504 | |
edbc9aa0 MC |
505 | /* |
506 | * lib iscsi will update this in the completion handling if there | |
507 | * is status. | |
508 | */ | |
509 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
510 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr); | |
511 | ||
a081c13e MC |
512 | if (tcp_conn->in.datalen == 0) |
513 | return 0; | |
514 | ||
515 | if (tcp_task->exp_datasn != datasn) { | |
0ab1c252 MC |
516 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)" |
517 | "\n", tcp_task->exp_datasn, datasn); | |
a081c13e MC |
518 | return ISCSI_ERR_DATASN; |
519 | } | |
520 | ||
521 | tcp_task->exp_datasn++; | |
522 | ||
523 | tcp_task->data_offset = be32_to_cpu(rhdr->offset); | |
524 | if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) { | |
0ab1c252 MC |
525 | ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > " |
526 | "total_length_in(%d)\n", tcp_task->data_offset, | |
527 | tcp_conn->in.datalen, total_in_length); | |
a081c13e MC |
528 | return ISCSI_ERR_DATA_OFFSET; |
529 | } | |
530 | ||
531 | conn->datain_pdus_cnt++; | |
532 | return 0; | |
533 | } | |
534 | ||
535 | /** | |
536 | * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing | |
537 | * @conn: iscsi connection | |
538 | * @task: scsi command task | |
539 | */ | |
540 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) | |
541 | { | |
542 | struct iscsi_session *session = conn->session; | |
543 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
544 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
545 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
546 | struct iscsi_r2t_info *r2t; | |
547 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
5d0fddd0 SP |
548 | u32 data_length; |
549 | u32 data_offset; | |
a081c13e MC |
550 | int rc; |
551 | ||
552 | if (tcp_conn->in.datalen) { | |
553 | iscsi_conn_printk(KERN_ERR, conn, | |
554 | "invalid R2t with datalen %d\n", | |
555 | tcp_conn->in.datalen); | |
556 | return ISCSI_ERR_DATALEN; | |
557 | } | |
558 | ||
559 | if (tcp_task->exp_datasn != r2tsn){ | |
0ab1c252 MC |
560 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", |
561 | tcp_task->exp_datasn, r2tsn); | |
a081c13e MC |
562 | return ISCSI_ERR_R2TSN; |
563 | } | |
564 | ||
565 | /* fill-in new R2T associated with the task */ | |
566 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
567 | ||
568 | if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) { | |
569 | iscsi_conn_printk(KERN_INFO, conn, | |
570 | "dropping R2T itt %d in recovery.\n", | |
571 | task->itt); | |
572 | return 0; | |
573 | } | |
574 | ||
5d0fddd0 SP |
575 | data_length = be32_to_cpu(rhdr->data_length); |
576 | if (data_length == 0) { | |
a081c13e MC |
577 | iscsi_conn_printk(KERN_ERR, conn, |
578 | "invalid R2T with zero data len\n"); | |
a081c13e MC |
579 | return ISCSI_ERR_DATALEN; |
580 | } | |
581 | ||
5d0fddd0 | 582 | if (data_length > session->max_burst) |
0ab1c252 MC |
583 | ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max " |
584 | "burst %u. Attempting to execute request.\n", | |
5d0fddd0 | 585 | data_length, session->max_burst); |
a081c13e | 586 | |
5d0fddd0 | 587 | data_offset = be32_to_cpu(rhdr->data_offset); |
ae3d56d8 | 588 | if (data_offset + data_length > task->sc->sdb.length) { |
a081c13e MC |
589 | iscsi_conn_printk(KERN_ERR, conn, |
590 | "invalid R2T with data len %u at offset %u " | |
5d0fddd0 | 591 | "and total length %d\n", data_length, |
ae3d56d8 | 592 | data_offset, task->sc->sdb.length); |
a081c13e MC |
593 | return ISCSI_ERR_DATALEN; |
594 | } | |
595 | ||
659743b0 | 596 | spin_lock(&tcp_task->pool2queue); |
5d0fddd0 SP |
597 | rc = kfifo_out(&tcp_task->r2tpool.queue, (void *)&r2t, sizeof(void *)); |
598 | if (!rc) { | |
599 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
600 | "Target has sent more R2Ts than it " | |
601 | "negotiated for or driver has leaked.\n"); | |
659743b0 | 602 | spin_unlock(&tcp_task->pool2queue); |
5d0fddd0 SP |
603 | return ISCSI_ERR_PROTO; |
604 | } | |
605 | ||
606 | r2t->exp_statsn = rhdr->statsn; | |
607 | r2t->data_length = data_length; | |
608 | r2t->data_offset = data_offset; | |
609 | ||
a081c13e MC |
610 | r2t->ttt = rhdr->ttt; /* no flip */ |
611 | r2t->datasn = 0; | |
612 | r2t->sent = 0; | |
613 | ||
614 | tcp_task->exp_datasn = r2tsn + 1; | |
7acd72eb | 615 | kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); |
a081c13e | 616 | conn->r2t_pdus_cnt++; |
659743b0 | 617 | spin_unlock(&tcp_task->pool2queue); |
a081c13e MC |
618 | |
619 | iscsi_requeue_task(task); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Handle incoming reply to DataIn command | |
625 | */ | |
626 | static int | |
627 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
628 | struct iscsi_segment *segment) | |
629 | { | |
630 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
631 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
632 | int rc; | |
633 | ||
634 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
635 | return ISCSI_ERR_DATA_DGST; | |
636 | ||
637 | /* check for non-exceptional status */ | |
638 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
639 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
640 | if (rc) | |
641 | return rc; | |
642 | } | |
643 | ||
644 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | /** | |
649 | * iscsi_tcp_hdr_dissect - process PDU header | |
650 | * @conn: iSCSI connection | |
651 | * @hdr: PDU header | |
652 | * | |
653 | * This function analyzes the header of the PDU received, | |
654 | * and performs several sanity checks. If the PDU is accompanied | |
655 | * by data, the receive buffer is set up to copy the incoming data | |
656 | * to the correct location. | |
657 | */ | |
658 | static int | |
659 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
660 | { | |
661 | int rc = 0, opcode, ahslen; | |
662 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
663 | struct iscsi_task *task; | |
664 | ||
665 | /* verify PDU length */ | |
666 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
667 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
668 | iscsi_conn_printk(KERN_ERR, conn, | |
669 | "iscsi_tcp: datalen %d > %d\n", | |
670 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
671 | return ISCSI_ERR_DATALEN; | |
672 | } | |
673 | ||
674 | /* Additional header segments. So far, we don't | |
675 | * process additional headers. | |
676 | */ | |
677 | ahslen = hdr->hlength << 2; | |
678 | ||
679 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
680 | /* verify itt (itt encoding: age+cid+itt) */ | |
681 | rc = iscsi_verify_itt(conn, hdr->itt); | |
682 | if (rc) | |
683 | return rc; | |
684 | ||
0ab1c252 MC |
685 | ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n", |
686 | opcode, ahslen, tcp_conn->in.datalen); | |
a081c13e MC |
687 | |
688 | switch(opcode) { | |
689 | case ISCSI_OP_SCSI_DATA_IN: | |
659743b0 | 690 | spin_lock(&conn->session->back_lock); |
a081c13e MC |
691 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
692 | if (!task) | |
693 | rc = ISCSI_ERR_BAD_ITT; | |
694 | else | |
695 | rc = iscsi_tcp_data_in(conn, task); | |
696 | if (rc) { | |
659743b0 | 697 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
698 | break; |
699 | } | |
700 | ||
701 | if (tcp_conn->in.datalen) { | |
702 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
5d6ac29b | 703 | struct ahash_request *rx_hash = NULL; |
ae3d56d8 | 704 | struct scsi_data_buffer *sdb = &task->sc->sdb; |
a081c13e MC |
705 | |
706 | /* | |
91ebc1fa | 707 | * Setup copy of Data-In into the struct scsi_cmnd |
a081c13e MC |
708 | * Scatterlist case: |
709 | * We set up the iscsi_segment to point to the next | |
710 | * scatterlist entry to copy to. As we go along, | |
711 | * we move on to the next scatterlist entry and | |
712 | * update the digest per-entry. | |
713 | */ | |
714 | if (conn->datadgst_en && | |
715 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
716 | rx_hash = tcp_conn->rx_hash; | |
717 | ||
0ab1c252 MC |
718 | ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( " |
719 | "offset=%d, datalen=%d)\n", | |
720 | tcp_task->data_offset, | |
721 | tcp_conn->in.datalen); | |
d355e57d | 722 | task->last_xfer = jiffies; |
a081c13e MC |
723 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
724 | sdb->table.sgl, | |
725 | sdb->table.nents, | |
726 | tcp_task->data_offset, | |
727 | tcp_conn->in.datalen, | |
728 | iscsi_tcp_process_data_in, | |
729 | rx_hash); | |
659743b0 | 730 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
731 | return rc; |
732 | } | |
733 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
659743b0 | 734 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
735 | break; |
736 | case ISCSI_OP_SCSI_CMD_RSP: | |
737 | if (tcp_conn->in.datalen) { | |
738 | iscsi_tcp_data_recv_prep(tcp_conn); | |
739 | return 0; | |
740 | } | |
741 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
742 | break; | |
743 | case ISCSI_OP_R2T: | |
659743b0 | 744 | spin_lock(&conn->session->back_lock); |
a081c13e | 745 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
659743b0 | 746 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
747 | if (!task) |
748 | rc = ISCSI_ERR_BAD_ITT; | |
749 | else if (ahslen) | |
750 | rc = ISCSI_ERR_AHSLEN; | |
d355e57d MC |
751 | else if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
752 | task->last_xfer = jiffies; | |
659743b0 | 753 | spin_lock(&conn->session->frwd_lock); |
a081c13e | 754 | rc = iscsi_tcp_r2t_rsp(conn, task); |
659743b0 | 755 | spin_unlock(&conn->session->frwd_lock); |
d355e57d | 756 | } else |
a081c13e | 757 | rc = ISCSI_ERR_PROTO; |
a081c13e MC |
758 | break; |
759 | case ISCSI_OP_LOGIN_RSP: | |
760 | case ISCSI_OP_TEXT_RSP: | |
761 | case ISCSI_OP_REJECT: | |
762 | case ISCSI_OP_ASYNC_EVENT: | |
763 | /* | |
764 | * It is possible that we could get a PDU with a buffer larger | |
765 | * than 8K, but there are no targets that currently do this. | |
766 | * For now we fail until we find a vendor that needs it | |
767 | */ | |
768 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
769 | iscsi_conn_printk(KERN_ERR, conn, | |
770 | "iscsi_tcp: received buffer of " | |
771 | "len %u but conn buffer is only %u " | |
772 | "(opcode %0x)\n", | |
773 | tcp_conn->in.datalen, | |
774 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
775 | rc = ISCSI_ERR_PROTO; | |
776 | break; | |
777 | } | |
778 | ||
779 | /* If there's data coming in with the response, | |
780 | * receive it to the connection's buffer. | |
781 | */ | |
782 | if (tcp_conn->in.datalen) { | |
783 | iscsi_tcp_data_recv_prep(tcp_conn); | |
784 | return 0; | |
785 | } | |
786 | /* fall through */ | |
787 | case ISCSI_OP_LOGOUT_RSP: | |
788 | case ISCSI_OP_NOOP_IN: | |
789 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
790 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
791 | break; | |
792 | default: | |
793 | rc = ISCSI_ERR_BAD_OPCODE; | |
794 | break; | |
795 | } | |
796 | ||
797 | if (rc == 0) { | |
798 | /* Anything that comes with data should have | |
799 | * been handled above. */ | |
800 | if (tcp_conn->in.datalen) | |
801 | return ISCSI_ERR_PROTO; | |
802 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
803 | } | |
804 | ||
805 | return rc; | |
806 | } | |
807 | ||
808 | /** | |
809 | * iscsi_tcp_hdr_recv_done - process PDU header | |
ccd4a430 RD |
810 | * @tcp_conn: iSCSI TCP connection |
811 | * @segment: the buffer segment being processed | |
a081c13e MC |
812 | * |
813 | * This is the callback invoked when the PDU header has | |
814 | * been received. If the header is followed by additional | |
815 | * header segments, we go back for more data. | |
816 | */ | |
817 | static int | |
818 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
819 | struct iscsi_segment *segment) | |
820 | { | |
821 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
822 | struct iscsi_hdr *hdr; | |
823 | ||
824 | /* Check if there are additional header segments | |
825 | * *prior* to computing the digest, because we | |
826 | * may need to go back to the caller for more. | |
827 | */ | |
828 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
829 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
830 | /* Bump the header length - the caller will | |
831 | * just loop around and get the AHS for us, and | |
832 | * call again. */ | |
833 | unsigned int ahslen = hdr->hlength << 2; | |
834 | ||
835 | /* Make sure we don't overflow */ | |
836 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
837 | return ISCSI_ERR_AHSLEN; | |
838 | ||
839 | segment->total_size += ahslen; | |
840 | segment->size += ahslen; | |
841 | return 0; | |
842 | } | |
843 | ||
844 | /* We're done processing the header. See if we're doing | |
845 | * header digests; if so, set up the recv_digest buffer | |
846 | * and go back for more. */ | |
6df19a79 MC |
847 | if (conn->hdrdgst_en && |
848 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { | |
a081c13e MC |
849 | if (segment->digest_len == 0) { |
850 | /* | |
851 | * Even if we offload the digest processing we | |
852 | * splice it in so we can increment the skb/segment | |
853 | * counters in preparation for the data segment. | |
854 | */ | |
855 | iscsi_tcp_segment_splice_digest(segment, | |
856 | segment->recv_digest); | |
857 | return 0; | |
858 | } | |
859 | ||
6df19a79 MC |
860 | iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr, |
861 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
862 | segment->digest); | |
a081c13e | 863 | |
6df19a79 MC |
864 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
865 | return ISCSI_ERR_HDR_DGST; | |
a081c13e MC |
866 | } |
867 | ||
868 | tcp_conn->in.hdr = hdr; | |
869 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
870 | } | |
871 | ||
872 | /** | |
873 | * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header | |
874 | * @tcp_conn: iscsi tcp conn | |
875 | * | |
876 | * returns non zero if we are currently processing or setup to process | |
877 | * a header. | |
878 | */ | |
879 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) | |
880 | { | |
881 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
882 | } | |
883 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr); | |
884 | ||
885 | /** | |
886 | * iscsi_tcp_recv_skb - Process skb | |
887 | * @conn: iscsi connection | |
888 | * @skb: network buffer with header and/or data segment | |
889 | * @offset: offset in skb | |
ccd4a430 RD |
890 | * @offloaded: bool indicating if transfer was offloaded |
891 | * @status: iscsi TCP status result | |
a081c13e | 892 | * |
ccd4a430 | 893 | * Will return status of transfer in @status. And will return |
a081c13e MC |
894 | * number of bytes copied. |
895 | */ | |
896 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
897 | unsigned int offset, bool offloaded, int *status) | |
898 | { | |
899 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
900 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
901 | struct skb_seq_state seq; | |
902 | unsigned int consumed = 0; | |
903 | int rc = 0; | |
904 | ||
0ab1c252 | 905 | ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset); |
d1acfae5 MC |
906 | /* |
907 | * Update for each skb instead of pdu, because over slow networks a | |
908 | * data_in's data could take a while to read in. We also want to | |
909 | * account for r2ts. | |
910 | */ | |
911 | conn->last_recv = jiffies; | |
a081c13e MC |
912 | |
913 | if (unlikely(conn->suspend_rx)) { | |
0ab1c252 | 914 | ISCSI_DBG_TCP(conn, "Rx suspended!\n"); |
a081c13e MC |
915 | *status = ISCSI_TCP_SUSPENDED; |
916 | return 0; | |
917 | } | |
918 | ||
919 | if (offloaded) { | |
920 | segment->total_copied = segment->total_size; | |
921 | goto segment_done; | |
922 | } | |
923 | ||
924 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
925 | while (1) { | |
926 | unsigned int avail; | |
927 | const u8 *ptr; | |
928 | ||
929 | avail = skb_seq_read(consumed, &ptr, &seq); | |
930 | if (avail == 0) { | |
0ab1c252 MC |
931 | ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", |
932 | consumed); | |
a081c13e | 933 | *status = ISCSI_TCP_SKB_DONE; |
a081c13e MC |
934 | goto skb_done; |
935 | } | |
936 | BUG_ON(segment->copied >= segment->size); | |
937 | ||
0ab1c252 MC |
938 | ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr, |
939 | avail); | |
a081c13e MC |
940 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
941 | BUG_ON(rc == 0); | |
942 | consumed += rc; | |
943 | ||
944 | if (segment->total_copied >= segment->total_size) { | |
945 | skb_abort_seq_read(&seq); | |
946 | goto segment_done; | |
947 | } | |
948 | } | |
949 | ||
950 | segment_done: | |
951 | *status = ISCSI_TCP_SEGMENT_DONE; | |
0ab1c252 | 952 | ISCSI_DBG_TCP(conn, "segment done\n"); |
a081c13e MC |
953 | rc = segment->done(tcp_conn, segment); |
954 | if (rc != 0) { | |
955 | *status = ISCSI_TCP_CONN_ERR; | |
0ab1c252 | 956 | ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc); |
a081c13e MC |
957 | iscsi_conn_failure(conn, rc); |
958 | return 0; | |
959 | } | |
960 | /* The done() functions sets up the next segment. */ | |
961 | ||
962 | skb_done: | |
963 | conn->rxdata_octets += consumed; | |
964 | return consumed; | |
965 | } | |
966 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
967 | ||
968 | /** | |
969 | * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
a081c13e | 970 | * @task: scsi command task |
a081c13e MC |
971 | */ |
972 | int iscsi_tcp_task_init(struct iscsi_task *task) | |
973 | { | |
974 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
975 | struct iscsi_conn *conn = task->conn; | |
976 | struct scsi_cmnd *sc = task->sc; | |
977 | int err; | |
978 | ||
979 | if (!sc) { | |
980 | /* | |
981 | * mgmt tasks do not have a scatterlist since they come | |
982 | * in from the iscsi interface. | |
983 | */ | |
0ab1c252 | 984 | ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt); |
a081c13e MC |
985 | |
986 | return conn->session->tt->init_pdu(task, 0, task->data_count); | |
987 | } | |
988 | ||
e64c026d | 989 | BUG_ON(kfifo_len(&tcp_task->r2tqueue)); |
a081c13e MC |
990 | tcp_task->exp_datasn = 0; |
991 | ||
992 | /* Prepare PDU, optionally w/ immediate data */ | |
0ab1c252 MC |
993 | ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n", |
994 | task->itt, task->imm_count, task->unsol_r2t.data_length); | |
a081c13e MC |
995 | |
996 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); | |
997 | if (err) | |
998 | return err; | |
999 | task->imm_count = 0; | |
1000 | return 0; | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_init); | |
1003 | ||
1004 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) | |
1005 | { | |
a081c13e MC |
1006 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
1007 | struct iscsi_r2t_info *r2t = NULL; | |
1008 | ||
1009 | if (iscsi_task_has_unsol_data(task)) | |
1010 | r2t = &task->unsol_r2t; | |
1011 | else { | |
659743b0 | 1012 | spin_lock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1013 | if (tcp_task->r2t) { |
1014 | r2t = tcp_task->r2t; | |
1015 | /* Continue with this R2T? */ | |
1016 | if (r2t->data_length <= r2t->sent) { | |
0ab1c252 MC |
1017 | ISCSI_DBG_TCP(task->conn, |
1018 | " done with r2t %p\n", r2t); | |
7acd72eb | 1019 | kfifo_in(&tcp_task->r2tpool.queue, |
a081c13e MC |
1020 | (void *)&tcp_task->r2t, |
1021 | sizeof(void *)); | |
1022 | tcp_task->r2t = r2t = NULL; | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | if (r2t == NULL) { | |
9842c38e SS |
1027 | if (kfifo_out(&tcp_task->r2tqueue, |
1028 | (void *)&tcp_task->r2t, sizeof(void *)) != | |
fee099b2 | 1029 | sizeof(void *)) |
9842c38e | 1030 | r2t = NULL; |
fee099b2 MC |
1031 | else |
1032 | r2t = tcp_task->r2t; | |
a081c13e | 1033 | } |
659743b0 | 1034 | spin_unlock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1035 | } |
1036 | ||
1037 | return r2t; | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * iscsi_tcp_task_xmit - xmit normal PDU task | |
1042 | * @task: iscsi command task | |
1043 | * | |
af901ca1 | 1044 | * We're expected to return 0 when everything was transmitted successfully, |
a081c13e MC |
1045 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind |
1046 | * of error. | |
1047 | */ | |
1048 | int iscsi_tcp_task_xmit(struct iscsi_task *task) | |
1049 | { | |
1050 | struct iscsi_conn *conn = task->conn; | |
1051 | struct iscsi_session *session = conn->session; | |
1052 | struct iscsi_r2t_info *r2t; | |
1053 | int rc = 0; | |
1054 | ||
1055 | flush: | |
1056 | /* Flush any pending data first. */ | |
1057 | rc = session->tt->xmit_pdu(task); | |
1058 | if (rc < 0) | |
1059 | return rc; | |
1060 | ||
1061 | /* mgmt command */ | |
1062 | if (!task->sc) { | |
1063 | if (task->hdr->itt == RESERVED_ITT) | |
1064 | iscsi_put_task(task); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | /* Are we done already? */ | |
1069 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) | |
1070 | return 0; | |
1071 | ||
1072 | r2t = iscsi_tcp_get_curr_r2t(task); | |
1073 | if (r2t == NULL) { | |
1074 | /* Waiting for more R2Ts to arrive. */ | |
0ab1c252 | 1075 | ISCSI_DBG_TCP(conn, "no R2Ts yet\n"); |
a081c13e MC |
1076 | return 0; |
1077 | } | |
1078 | ||
2ff79d52 | 1079 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT); |
a081c13e MC |
1080 | if (rc) |
1081 | return rc; | |
1082 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
1083 | ||
0ab1c252 MC |
1084 | ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1085 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1086 | r2t->data_offset + r2t->sent, r2t->data_count); | |
a081c13e MC |
1087 | |
1088 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, | |
1089 | r2t->data_count); | |
9a6510eb MC |
1090 | if (rc) { |
1091 | iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED); | |
a081c13e | 1092 | return rc; |
9a6510eb MC |
1093 | } |
1094 | ||
a081c13e MC |
1095 | r2t->sent += r2t->data_count; |
1096 | goto flush; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit); | |
1099 | ||
1100 | struct iscsi_cls_conn * | |
1101 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
1102 | uint32_t conn_idx) | |
1103 | ||
1104 | { | |
1105 | struct iscsi_conn *conn; | |
1106 | struct iscsi_cls_conn *cls_conn; | |
1107 | struct iscsi_tcp_conn *tcp_conn; | |
1108 | ||
74dcd0ec MC |
1109 | cls_conn = iscsi_conn_setup(cls_session, |
1110 | sizeof(*tcp_conn) + dd_data_size, conn_idx); | |
a081c13e MC |
1111 | if (!cls_conn) |
1112 | return NULL; | |
1113 | conn = cls_conn->dd_data; | |
1114 | /* | |
1115 | * due to strange issues with iser these are not set | |
1116 | * in iscsi_conn_setup | |
1117 | */ | |
1118 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1119 | ||
1120 | tcp_conn = conn->dd_data; | |
1121 | tcp_conn->iscsi_conn = conn; | |
74dcd0ec | 1122 | tcp_conn->dd_data = conn->dd_data + sizeof(*tcp_conn); |
a081c13e MC |
1123 | return cls_conn; |
1124 | } | |
1125 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup); | |
1126 | ||
1127 | void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1128 | { | |
a081c13e MC |
1129 | iscsi_conn_teardown(cls_conn); |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown); | |
1132 | ||
1133 | int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session) | |
1134 | { | |
1135 | int i; | |
1136 | int cmd_i; | |
1137 | ||
1138 | /* | |
1139 | * initialize per-task: R2T pool and xmit queue | |
1140 | */ | |
1141 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1142 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1143 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1144 | ||
1145 | /* | |
1146 | * pre-allocated x2 as much r2ts to handle race when | |
1147 | * target acks DataOut faster than we data_xmit() queues | |
1148 | * could replenish r2tqueue. | |
1149 | */ | |
1150 | ||
1151 | /* R2T pool */ | |
1152 | if (iscsi_pool_init(&tcp_task->r2tpool, | |
1153 | session->max_r2t * 2, NULL, | |
1154 | sizeof(struct iscsi_r2t_info))) { | |
1155 | goto r2t_alloc_fail; | |
1156 | } | |
1157 | ||
1158 | /* R2T xmit queue */ | |
45465487 | 1159 | if (kfifo_alloc(&tcp_task->r2tqueue, |
c1e13f25 | 1160 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) { |
a081c13e MC |
1161 | iscsi_pool_free(&tcp_task->r2tpool); |
1162 | goto r2t_alloc_fail; | |
1163 | } | |
659743b0 SP |
1164 | spin_lock_init(&tcp_task->pool2queue); |
1165 | spin_lock_init(&tcp_task->queue2pool); | |
a081c13e MC |
1166 | } |
1167 | ||
1168 | return 0; | |
1169 | ||
1170 | r2t_alloc_fail: | |
1171 | for (i = 0; i < cmd_i; i++) { | |
1172 | struct iscsi_task *task = session->cmds[i]; | |
1173 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1174 | ||
45465487 | 1175 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1176 | iscsi_pool_free(&tcp_task->r2tpool); |
1177 | } | |
1178 | return -ENOMEM; | |
1179 | } | |
1180 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc); | |
1181 | ||
1182 | void iscsi_tcp_r2tpool_free(struct iscsi_session *session) | |
1183 | { | |
1184 | int i; | |
1185 | ||
1186 | for (i = 0; i < session->cmds_max; i++) { | |
1187 | struct iscsi_task *task = session->cmds[i]; | |
1188 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1189 | ||
45465487 | 1190 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1191 | iscsi_pool_free(&tcp_task->r2tpool); |
1192 | } | |
1193 | } | |
1194 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free); | |
1195 | ||
1304be5f MC |
1196 | int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf) |
1197 | { | |
1198 | struct iscsi_session *session = conn->session; | |
1199 | unsigned short r2ts = 0; | |
1200 | ||
1201 | sscanf(buf, "%hu", &r2ts); | |
1202 | if (session->max_r2t == r2ts) | |
1203 | return 0; | |
1204 | ||
1205 | if (!r2ts || !is_power_of_2(r2ts)) | |
1206 | return -EINVAL; | |
1207 | ||
1208 | session->max_r2t = r2ts; | |
1209 | iscsi_tcp_r2tpool_free(session); | |
1210 | return iscsi_tcp_r2tpool_alloc(session); | |
1211 | } | |
1212 | EXPORT_SYMBOL_GPL(iscsi_tcp_set_max_r2t); | |
1213 | ||
a081c13e MC |
1214 | void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
1215 | struct iscsi_stats *stats) | |
1216 | { | |
1217 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1218 | ||
1219 | stats->txdata_octets = conn->txdata_octets; | |
1220 | stats->rxdata_octets = conn->rxdata_octets; | |
1221 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1222 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1223 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1224 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1225 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1226 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1227 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats); |