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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a081c13e MC |
2 | /* |
3 | * iSCSI over TCP/IP Data-Path lib | |
4 | * | |
5 | * Copyright (C) 2004 Dmitry Yusupov | |
6 | * Copyright (C) 2004 Alex Aizman | |
7 | * Copyright (C) 2005 - 2006 Mike Christie | |
8 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
9 | * maintained by open-iscsi@googlegroups.com | |
10 | * | |
a081c13e MC |
11 | * Credits: |
12 | * Christoph Hellwig | |
13 | * FUJITA Tomonori | |
14 | * Arne Redlich | |
15 | * Zhenyu Wang | |
16 | */ | |
17 | ||
5d6ac29b | 18 | #include <crypto/hash.h> |
a081c13e MC |
19 | #include <linux/types.h> |
20 | #include <linux/list.h> | |
21 | #include <linux/inet.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
a081c13e MC |
23 | #include <linux/file.h> |
24 | #include <linux/blkdev.h> | |
a081c13e MC |
25 | #include <linux/delay.h> |
26 | #include <linux/kfifo.h> | |
27 | #include <linux/scatterlist.h> | |
acf3368f | 28 | #include <linux/module.h> |
a081c13e MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_host.h> | |
33 | #include <scsi/scsi.h> | |
34 | #include <scsi/scsi_transport_iscsi.h> | |
c2332b00 | 35 | #include <trace/events/iscsi.h> |
a081c13e MC |
36 | |
37 | #include "iscsi_tcp.h" | |
38 | ||
39 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " | |
40 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
41 | "Alex Aizman <itn780@yahoo.com>"); | |
42 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
43 | MODULE_LICENSE("GPL"); | |
a081c13e | 44 | |
0ab1c252 MC |
45 | static int iscsi_dbg_libtcp; |
46 | module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int, | |
47 | S_IRUGO | S_IWUSR); | |
48 | MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp " | |
49 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
50 | "is off."); | |
51 | ||
52 | #define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...) \ | |
53 | do { \ | |
54 | if (iscsi_dbg_libtcp) \ | |
55 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
56 | "%s " dbg_fmt, \ | |
57 | __func__, ##arg); \ | |
c2332b00 FH |
58 | iscsi_dbg_trace(trace_iscsi_dbg_tcp, \ |
59 | &(_conn)->cls_conn->dev, \ | |
60 | "%s " dbg_fmt, __func__, ##arg);\ | |
0ab1c252 | 61 | } while (0); |
a081c13e MC |
62 | |
63 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
64 | struct iscsi_segment *segment); | |
65 | ||
66 | /* | |
67 | * Scatterlist handling: inside the iscsi_segment, we | |
68 | * remember an index into the scatterlist, and set data/size | |
69 | * to the current scatterlist entry. For highmem pages, we | |
70 | * kmap as needed. | |
71 | * | |
72 | * Note that the page is unmapped when we return from | |
73 | * TCP's data_ready handler, so we may end up mapping and | |
74 | * unmapping the same page repeatedly. The whole reason | |
75 | * for this is that we shouldn't keep the page mapped | |
76 | * outside the softirq. | |
77 | */ | |
78 | ||
79 | /** | |
80 | * iscsi_tcp_segment_init_sg - init indicated scatterlist entry | |
81 | * @segment: the buffer object | |
82 | * @sg: scatterlist | |
83 | * @offset: byte offset into that sg entry | |
84 | * | |
85 | * This function sets up the segment so that subsequent | |
86 | * data is copied to the indicated sg entry, at the given | |
87 | * offset. | |
88 | */ | |
89 | static inline void | |
90 | iscsi_tcp_segment_init_sg(struct iscsi_segment *segment, | |
91 | struct scatterlist *sg, unsigned int offset) | |
92 | { | |
93 | segment->sg = sg; | |
94 | segment->sg_offset = offset; | |
95 | segment->size = min(sg->length - offset, | |
96 | segment->total_size - segment->total_copied); | |
97 | segment->data = NULL; | |
98 | } | |
99 | ||
100 | /** | |
101 | * iscsi_tcp_segment_map - map the current S/G page | |
102 | * @segment: iscsi_segment | |
103 | * @recv: 1 if called from recv path | |
104 | * | |
105 | * We only need to possibly kmap data if scatter lists are being used, | |
106 | * because the iscsi passthrough and internal IO paths will never use high | |
107 | * mem pages. | |
108 | */ | |
109 | static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) | |
110 | { | |
111 | struct scatterlist *sg; | |
112 | ||
113 | if (segment->data != NULL || !segment->sg) | |
114 | return; | |
115 | ||
116 | sg = segment->sg; | |
117 | BUG_ON(segment->sg_mapped); | |
118 | BUG_ON(sg->length == 0); | |
119 | ||
120 | /* | |
08b11eac VA |
121 | * We always map for the recv path. |
122 | * | |
a081c13e MC |
123 | * If the page count is greater than one it is ok to send |
124 | * to the network layer's zero copy send path. If not we | |
08b11eac VA |
125 | * have to go the slow sendmsg path. |
126 | * | |
127 | * Same goes for slab pages: skb_can_coalesce() allows | |
128 | * coalescing neighboring slab objects into a single frag which | |
129 | * triggers one of hardened usercopy checks. | |
a081c13e | 130 | */ |
6aa25c73 | 131 | if (!recv && sendpage_ok(sg_page(sg))) |
a081c13e MC |
132 | return; |
133 | ||
70c7c88a MC |
134 | if (recv) { |
135 | segment->atomic_mapped = true; | |
77dfce07 | 136 | segment->sg_mapped = kmap_atomic(sg_page(sg)); |
70c7c88a MC |
137 | } else { |
138 | segment->atomic_mapped = false; | |
139 | /* the xmit path can sleep with the page mapped so use kmap */ | |
140 | segment->sg_mapped = kmap(sg_page(sg)); | |
141 | } | |
142 | ||
a081c13e MC |
143 | segment->data = segment->sg_mapped + sg->offset + segment->sg_offset; |
144 | } | |
145 | ||
146 | void iscsi_tcp_segment_unmap(struct iscsi_segment *segment) | |
147 | { | |
a081c13e | 148 | if (segment->sg_mapped) { |
70c7c88a | 149 | if (segment->atomic_mapped) |
77dfce07 | 150 | kunmap_atomic(segment->sg_mapped); |
70c7c88a MC |
151 | else |
152 | kunmap(sg_page(segment->sg)); | |
a081c13e MC |
153 | segment->sg_mapped = NULL; |
154 | segment->data = NULL; | |
155 | } | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap); | |
158 | ||
159 | /* | |
160 | * Splice the digest buffer into the buffer | |
161 | */ | |
162 | static inline void | |
163 | iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest) | |
164 | { | |
165 | segment->data = digest; | |
166 | segment->digest_len = ISCSI_DIGEST_SIZE; | |
167 | segment->total_size += ISCSI_DIGEST_SIZE; | |
168 | segment->size = ISCSI_DIGEST_SIZE; | |
169 | segment->copied = 0; | |
170 | segment->sg = NULL; | |
171 | segment->hash = NULL; | |
172 | } | |
173 | ||
174 | /** | |
175 | * iscsi_tcp_segment_done - check whether the segment is complete | |
6df19a79 | 176 | * @tcp_conn: iscsi tcp connection |
a081c13e MC |
177 | * @segment: iscsi segment to check |
178 | * @recv: set to one of this is called from the recv path | |
179 | * @copied: number of bytes copied | |
180 | * | |
181 | * Check if we're done receiving this segment. If the receive | |
182 | * buffer is full but we expect more data, move on to the | |
183 | * next entry in the scatterlist. | |
184 | * | |
185 | * If the amount of data we received isn't a multiple of 4, | |
186 | * we will transparently receive the pad bytes, too. | |
187 | * | |
188 | * This function must be re-entrant. | |
189 | */ | |
6df19a79 MC |
190 | int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn, |
191 | struct iscsi_segment *segment, int recv, | |
a081c13e MC |
192 | unsigned copied) |
193 | { | |
a081c13e MC |
194 | struct scatterlist sg; |
195 | unsigned int pad; | |
196 | ||
0ab1c252 MC |
197 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n", |
198 | segment->copied, copied, segment->size, | |
199 | recv ? "recv" : "xmit"); | |
a081c13e MC |
200 | if (segment->hash && copied) { |
201 | /* | |
202 | * If a segment is kmapd we must unmap it before sending | |
203 | * to the crypto layer since that will try to kmap it again. | |
204 | */ | |
205 | iscsi_tcp_segment_unmap(segment); | |
206 | ||
207 | if (!segment->data) { | |
208 | sg_init_table(&sg, 1); | |
209 | sg_set_page(&sg, sg_page(segment->sg), copied, | |
210 | segment->copied + segment->sg_offset + | |
211 | segment->sg->offset); | |
212 | } else | |
213 | sg_init_one(&sg, segment->data + segment->copied, | |
214 | copied); | |
5d6ac29b HX |
215 | ahash_request_set_crypt(segment->hash, &sg, NULL, copied); |
216 | crypto_ahash_update(segment->hash); | |
a081c13e MC |
217 | } |
218 | ||
219 | segment->copied += copied; | |
220 | if (segment->copied < segment->size) { | |
221 | iscsi_tcp_segment_map(segment, recv); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | segment->total_copied += segment->copied; | |
226 | segment->copied = 0; | |
227 | segment->size = 0; | |
228 | ||
229 | /* Unmap the current scatterlist page, if there is one. */ | |
230 | iscsi_tcp_segment_unmap(segment); | |
231 | ||
232 | /* Do we have more scatterlist entries? */ | |
0ab1c252 MC |
233 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n", |
234 | segment->total_copied, segment->total_size); | |
a081c13e MC |
235 | if (segment->total_copied < segment->total_size) { |
236 | /* Proceed to the next entry in the scatterlist. */ | |
237 | iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg), | |
238 | 0); | |
239 | iscsi_tcp_segment_map(segment, recv); | |
240 | BUG_ON(segment->size == 0); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | /* Do we need to handle padding? */ | |
6df19a79 MC |
245 | if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) { |
246 | pad = iscsi_padding(segment->total_copied); | |
247 | if (pad != 0) { | |
0ab1c252 MC |
248 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
249 | "consume %d pad bytes\n", pad); | |
6df19a79 MC |
250 | segment->total_size += pad; |
251 | segment->size = pad; | |
2856830b | 252 | segment->data = segment->padbuf; |
6df19a79 MC |
253 | return 0; |
254 | } | |
a081c13e MC |
255 | } |
256 | ||
257 | /* | |
258 | * Set us up for transferring the data digest. hdr digest | |
259 | * is completely handled in hdr done function. | |
260 | */ | |
261 | if (segment->hash) { | |
5d6ac29b HX |
262 | ahash_request_set_crypt(segment->hash, NULL, |
263 | segment->digest, 0); | |
264 | crypto_ahash_final(segment->hash); | |
a081c13e MC |
265 | iscsi_tcp_segment_splice_digest(segment, |
266 | recv ? segment->recv_digest : segment->digest); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | return 1; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done); | |
273 | ||
274 | /** | |
275 | * iscsi_tcp_segment_recv - copy data to segment | |
276 | * @tcp_conn: the iSCSI TCP connection | |
277 | * @segment: the buffer to copy to | |
278 | * @ptr: data pointer | |
279 | * @len: amount of data available | |
280 | * | |
281 | * This function copies up to @len bytes to the | |
282 | * given buffer, and returns the number of bytes | |
283 | * consumed, which can actually be less than @len. | |
284 | * | |
285 | * If hash digest is enabled, the function will update the | |
286 | * hash while copying. | |
287 | * Combining these two operations doesn't buy us a lot (yet), | |
288 | * but in the future we could implement combined copy+crc, | |
289 | * just way we do for network layer checksums. | |
290 | */ | |
291 | static int | |
292 | iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn, | |
293 | struct iscsi_segment *segment, const void *ptr, | |
294 | unsigned int len) | |
295 | { | |
296 | unsigned int copy = 0, copied = 0; | |
297 | ||
6df19a79 | 298 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) { |
a081c13e | 299 | if (copied == len) { |
0ab1c252 MC |
300 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
301 | "copied %d bytes\n", len); | |
a081c13e MC |
302 | break; |
303 | } | |
304 | ||
305 | copy = min(len - copied, segment->size - segment->copied); | |
0ab1c252 | 306 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy); |
a081c13e MC |
307 | memcpy(segment->data + segment->copied, ptr + copied, copy); |
308 | copied += copy; | |
309 | } | |
310 | return copied; | |
311 | } | |
312 | ||
313 | inline void | |
5d6ac29b HX |
314 | iscsi_tcp_dgst_header(struct ahash_request *hash, const void *hdr, |
315 | size_t hdrlen, unsigned char digest[ISCSI_DIGEST_SIZE]) | |
a081c13e MC |
316 | { |
317 | struct scatterlist sg; | |
318 | ||
319 | sg_init_one(&sg, hdr, hdrlen); | |
5d6ac29b HX |
320 | ahash_request_set_crypt(hash, &sg, digest, hdrlen); |
321 | crypto_ahash_digest(hash); | |
a081c13e MC |
322 | } |
323 | EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header); | |
324 | ||
325 | static inline int | |
326 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
327 | struct iscsi_segment *segment) | |
328 | { | |
329 | if (!segment->digest_len) | |
330 | return 1; | |
331 | ||
332 | if (memcmp(segment->recv_digest, segment->digest, | |
333 | segment->digest_len)) { | |
0ab1c252 | 334 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n"); |
a081c13e MC |
335 | return 0; |
336 | } | |
337 | ||
338 | return 1; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Helper function to set up segment buffer | |
343 | */ | |
344 | static inline void | |
345 | __iscsi_segment_init(struct iscsi_segment *segment, size_t size, | |
5d6ac29b | 346 | iscsi_segment_done_fn_t *done, struct ahash_request *hash) |
a081c13e MC |
347 | { |
348 | memset(segment, 0, sizeof(*segment)); | |
349 | segment->total_size = size; | |
350 | segment->done = done; | |
351 | ||
352 | if (hash) { | |
353 | segment->hash = hash; | |
5d6ac29b | 354 | crypto_ahash_init(hash); |
a081c13e MC |
355 | } |
356 | } | |
357 | ||
358 | inline void | |
359 | iscsi_segment_init_linear(struct iscsi_segment *segment, void *data, | |
360 | size_t size, iscsi_segment_done_fn_t *done, | |
5d6ac29b | 361 | struct ahash_request *hash) |
a081c13e MC |
362 | { |
363 | __iscsi_segment_init(segment, size, done, hash); | |
364 | segment->data = data; | |
365 | segment->size = size; | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(iscsi_segment_init_linear); | |
368 | ||
369 | inline int | |
370 | iscsi_segment_seek_sg(struct iscsi_segment *segment, | |
371 | struct scatterlist *sg_list, unsigned int sg_count, | |
372 | unsigned int offset, size_t size, | |
5d6ac29b HX |
373 | iscsi_segment_done_fn_t *done, |
374 | struct ahash_request *hash) | |
a081c13e MC |
375 | { |
376 | struct scatterlist *sg; | |
377 | unsigned int i; | |
378 | ||
a081c13e MC |
379 | __iscsi_segment_init(segment, size, done, hash); |
380 | for_each_sg(sg_list, sg, sg_count, i) { | |
a081c13e MC |
381 | if (offset < sg->length) { |
382 | iscsi_tcp_segment_init_sg(segment, sg, offset); | |
383 | return 0; | |
384 | } | |
385 | offset -= sg->length; | |
386 | } | |
387 | ||
388 | return ISCSI_ERR_DATA_OFFSET; | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg); | |
391 | ||
392 | /** | |
393 | * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception | |
394 | * @tcp_conn: iscsi connection to prep for | |
395 | * | |
396 | * This function always passes NULL for the hash argument, because when this | |
397 | * function is called we do not yet know the final size of the header and want | |
398 | * to delay the digest processing until we know that. | |
399 | */ | |
400 | void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
401 | { | |
0ab1c252 MC |
402 | ISCSI_DBG_TCP(tcp_conn->iscsi_conn, |
403 | "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ? | |
404 | "digest enabled" : "digest disabled"); | |
a081c13e MC |
405 | iscsi_segment_init_linear(&tcp_conn->in.segment, |
406 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
407 | iscsi_tcp_hdr_recv_done, NULL); | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep); | |
410 | ||
411 | /* | |
412 | * Handle incoming reply to any other type of command | |
413 | */ | |
414 | static int | |
415 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
416 | struct iscsi_segment *segment) | |
417 | { | |
418 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
419 | int rc = 0; | |
420 | ||
421 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
422 | return ISCSI_ERR_DATA_DGST; | |
423 | ||
424 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
425 | conn->data, tcp_conn->in.datalen); | |
426 | if (rc) | |
427 | return rc; | |
428 | ||
429 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
430 | return 0; | |
431 | } | |
432 | ||
433 | static void | |
434 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
435 | { | |
436 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
5d6ac29b | 437 | struct ahash_request *rx_hash = NULL; |
a081c13e | 438 | |
ef7d17a9 | 439 | if (conn->datadgst_en && |
a081c13e MC |
440 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) |
441 | rx_hash = tcp_conn->rx_hash; | |
442 | ||
443 | iscsi_segment_init_linear(&tcp_conn->in.segment, | |
444 | conn->data, tcp_conn->in.datalen, | |
445 | iscsi_tcp_data_recv_done, rx_hash); | |
446 | } | |
447 | ||
448 | /** | |
449 | * iscsi_tcp_cleanup_task - free tcp_task resources | |
450 | * @task: iscsi task | |
451 | * | |
659743b0 | 452 | * must be called with session back_lock |
a081c13e MC |
453 | */ |
454 | void iscsi_tcp_cleanup_task(struct iscsi_task *task) | |
455 | { | |
456 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
457 | struct iscsi_r2t_info *r2t; | |
458 | ||
b3cd5050 MC |
459 | /* nothing to do for mgmt */ |
460 | if (!task->sc) | |
a081c13e MC |
461 | return; |
462 | ||
659743b0 | 463 | spin_lock_bh(&tcp_task->queue2pool); |
a081c13e | 464 | /* flush task's r2t queues */ |
7acd72eb SS |
465 | while (kfifo_out(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) { |
466 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, | |
a081c13e | 467 | sizeof(void*)); |
0ab1c252 | 468 | ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n"); |
a081c13e MC |
469 | } |
470 | ||
471 | r2t = tcp_task->r2t; | |
472 | if (r2t != NULL) { | |
7acd72eb | 473 | kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t, |
a081c13e MC |
474 | sizeof(void*)); |
475 | tcp_task->r2t = NULL; | |
476 | } | |
659743b0 | 477 | spin_unlock_bh(&tcp_task->queue2pool); |
a081c13e MC |
478 | } |
479 | EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task); | |
480 | ||
481 | /** | |
482 | * iscsi_tcp_data_in - SCSI Data-In Response processing | |
483 | * @conn: iscsi connection | |
484 | * @task: scsi command task | |
485 | */ | |
486 | static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task) | |
487 | { | |
488 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
489 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
490 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
491 | int datasn = be32_to_cpu(rhdr->datasn); | |
ae3d56d8 | 492 | unsigned total_in_length = task->sc->sdb.length; |
a081c13e | 493 | |
edbc9aa0 MC |
494 | /* |
495 | * lib iscsi will update this in the completion handling if there | |
496 | * is status. | |
497 | */ | |
498 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
499 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr); | |
500 | ||
a081c13e MC |
501 | if (tcp_conn->in.datalen == 0) |
502 | return 0; | |
503 | ||
504 | if (tcp_task->exp_datasn != datasn) { | |
0ab1c252 MC |
505 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)" |
506 | "\n", tcp_task->exp_datasn, datasn); | |
a081c13e MC |
507 | return ISCSI_ERR_DATASN; |
508 | } | |
509 | ||
510 | tcp_task->exp_datasn++; | |
511 | ||
512 | tcp_task->data_offset = be32_to_cpu(rhdr->offset); | |
513 | if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) { | |
0ab1c252 MC |
514 | ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > " |
515 | "total_length_in(%d)\n", tcp_task->data_offset, | |
516 | tcp_conn->in.datalen, total_in_length); | |
a081c13e MC |
517 | return ISCSI_ERR_DATA_OFFSET; |
518 | } | |
519 | ||
520 | conn->datain_pdus_cnt++; | |
521 | return 0; | |
522 | } | |
523 | ||
524 | /** | |
525 | * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing | |
526 | * @conn: iscsi connection | |
5923d64b | 527 | * @hdr: PDU header |
a081c13e | 528 | */ |
5923d64b | 529 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
a081c13e MC |
530 | { |
531 | struct iscsi_session *session = conn->session; | |
5923d64b MC |
532 | struct iscsi_tcp_task *tcp_task; |
533 | struct iscsi_tcp_conn *tcp_conn; | |
534 | struct iscsi_r2t_rsp *rhdr; | |
a081c13e | 535 | struct iscsi_r2t_info *r2t; |
5923d64b | 536 | struct iscsi_task *task; |
5d0fddd0 SP |
537 | u32 data_length; |
538 | u32 data_offset; | |
5923d64b | 539 | int r2tsn; |
a081c13e MC |
540 | int rc; |
541 | ||
5923d64b MC |
542 | spin_lock(&session->back_lock); |
543 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
544 | if (!task) { | |
545 | spin_unlock(&session->back_lock); | |
546 | return ISCSI_ERR_BAD_ITT; | |
547 | } else if (task->sc->sc_data_direction != DMA_TO_DEVICE) { | |
548 | spin_unlock(&session->back_lock); | |
549 | return ISCSI_ERR_PROTO; | |
550 | } | |
551 | /* | |
552 | * A bad target might complete the cmd before we have handled R2Ts | |
553 | * so get a ref to the task that will be dropped in the xmit path. | |
554 | */ | |
555 | if (task->state != ISCSI_TASK_RUNNING) { | |
556 | spin_unlock(&session->back_lock); | |
557 | /* Let the path that got the early rsp complete it */ | |
558 | return 0; | |
559 | } | |
560 | task->last_xfer = jiffies; | |
561 | __iscsi_get_task(task); | |
562 | ||
563 | tcp_conn = conn->dd_data; | |
564 | rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
565 | /* fill-in new R2T associated with the task */ | |
566 | iscsi_update_cmdsn(session, (struct iscsi_nopin *)rhdr); | |
567 | spin_unlock(&session->back_lock); | |
568 | ||
a081c13e MC |
569 | if (tcp_conn->in.datalen) { |
570 | iscsi_conn_printk(KERN_ERR, conn, | |
571 | "invalid R2t with datalen %d\n", | |
572 | tcp_conn->in.datalen); | |
5923d64b MC |
573 | rc = ISCSI_ERR_DATALEN; |
574 | goto put_task; | |
a081c13e MC |
575 | } |
576 | ||
5923d64b MC |
577 | tcp_task = task->dd_data; |
578 | r2tsn = be32_to_cpu(rhdr->r2tsn); | |
a081c13e | 579 | if (tcp_task->exp_datasn != r2tsn){ |
0ab1c252 MC |
580 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", |
581 | tcp_task->exp_datasn, r2tsn); | |
5923d64b MC |
582 | rc = ISCSI_ERR_R2TSN; |
583 | goto put_task; | |
a081c13e MC |
584 | } |
585 | ||
5923d64b | 586 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
a081c13e MC |
587 | iscsi_conn_printk(KERN_INFO, conn, |
588 | "dropping R2T itt %d in recovery.\n", | |
589 | task->itt); | |
5923d64b MC |
590 | rc = 0; |
591 | goto put_task; | |
a081c13e MC |
592 | } |
593 | ||
5d0fddd0 SP |
594 | data_length = be32_to_cpu(rhdr->data_length); |
595 | if (data_length == 0) { | |
a081c13e MC |
596 | iscsi_conn_printk(KERN_ERR, conn, |
597 | "invalid R2T with zero data len\n"); | |
5923d64b MC |
598 | rc = ISCSI_ERR_DATALEN; |
599 | goto put_task; | |
a081c13e MC |
600 | } |
601 | ||
5d0fddd0 | 602 | if (data_length > session->max_burst) |
0ab1c252 MC |
603 | ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max " |
604 | "burst %u. Attempting to execute request.\n", | |
5d0fddd0 | 605 | data_length, session->max_burst); |
a081c13e | 606 | |
5d0fddd0 | 607 | data_offset = be32_to_cpu(rhdr->data_offset); |
ae3d56d8 | 608 | if (data_offset + data_length > task->sc->sdb.length) { |
a081c13e MC |
609 | iscsi_conn_printk(KERN_ERR, conn, |
610 | "invalid R2T with data len %u at offset %u " | |
5d0fddd0 | 611 | "and total length %d\n", data_length, |
ae3d56d8 | 612 | data_offset, task->sc->sdb.length); |
5923d64b MC |
613 | rc = ISCSI_ERR_DATALEN; |
614 | goto put_task; | |
a081c13e MC |
615 | } |
616 | ||
659743b0 | 617 | spin_lock(&tcp_task->pool2queue); |
5d0fddd0 SP |
618 | rc = kfifo_out(&tcp_task->r2tpool.queue, (void *)&r2t, sizeof(void *)); |
619 | if (!rc) { | |
620 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
621 | "Target has sent more R2Ts than it " | |
622 | "negotiated for or driver has leaked.\n"); | |
659743b0 | 623 | spin_unlock(&tcp_task->pool2queue); |
5923d64b MC |
624 | rc = ISCSI_ERR_PROTO; |
625 | goto put_task; | |
5d0fddd0 SP |
626 | } |
627 | ||
628 | r2t->exp_statsn = rhdr->statsn; | |
629 | r2t->data_length = data_length; | |
630 | r2t->data_offset = data_offset; | |
631 | ||
a081c13e MC |
632 | r2t->ttt = rhdr->ttt; /* no flip */ |
633 | r2t->datasn = 0; | |
634 | r2t->sent = 0; | |
635 | ||
636 | tcp_task->exp_datasn = r2tsn + 1; | |
7acd72eb | 637 | kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); |
a081c13e | 638 | conn->r2t_pdus_cnt++; |
659743b0 | 639 | spin_unlock(&tcp_task->pool2queue); |
a081c13e MC |
640 | |
641 | iscsi_requeue_task(task); | |
642 | return 0; | |
5923d64b MC |
643 | |
644 | put_task: | |
645 | iscsi_put_task(task); | |
646 | return rc; | |
a081c13e MC |
647 | } |
648 | ||
649 | /* | |
650 | * Handle incoming reply to DataIn command | |
651 | */ | |
652 | static int | |
653 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
654 | struct iscsi_segment *segment) | |
655 | { | |
656 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
657 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
658 | int rc; | |
659 | ||
660 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
661 | return ISCSI_ERR_DATA_DGST; | |
662 | ||
663 | /* check for non-exceptional status */ | |
664 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
665 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
666 | if (rc) | |
667 | return rc; | |
668 | } | |
669 | ||
670 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
671 | return 0; | |
672 | } | |
673 | ||
674 | /** | |
675 | * iscsi_tcp_hdr_dissect - process PDU header | |
676 | * @conn: iSCSI connection | |
677 | * @hdr: PDU header | |
678 | * | |
679 | * This function analyzes the header of the PDU received, | |
680 | * and performs several sanity checks. If the PDU is accompanied | |
681 | * by data, the receive buffer is set up to copy the incoming data | |
682 | * to the correct location. | |
683 | */ | |
684 | static int | |
685 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
686 | { | |
687 | int rc = 0, opcode, ahslen; | |
688 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
689 | struct iscsi_task *task; | |
690 | ||
691 | /* verify PDU length */ | |
692 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
693 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
694 | iscsi_conn_printk(KERN_ERR, conn, | |
695 | "iscsi_tcp: datalen %d > %d\n", | |
696 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
697 | return ISCSI_ERR_DATALEN; | |
698 | } | |
699 | ||
700 | /* Additional header segments. So far, we don't | |
701 | * process additional headers. | |
702 | */ | |
703 | ahslen = hdr->hlength << 2; | |
704 | ||
705 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
706 | /* verify itt (itt encoding: age+cid+itt) */ | |
707 | rc = iscsi_verify_itt(conn, hdr->itt); | |
708 | if (rc) | |
709 | return rc; | |
710 | ||
0ab1c252 MC |
711 | ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n", |
712 | opcode, ahslen, tcp_conn->in.datalen); | |
a081c13e MC |
713 | |
714 | switch(opcode) { | |
715 | case ISCSI_OP_SCSI_DATA_IN: | |
659743b0 | 716 | spin_lock(&conn->session->back_lock); |
a081c13e MC |
717 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
718 | if (!task) | |
719 | rc = ISCSI_ERR_BAD_ITT; | |
720 | else | |
721 | rc = iscsi_tcp_data_in(conn, task); | |
722 | if (rc) { | |
659743b0 | 723 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
724 | break; |
725 | } | |
726 | ||
727 | if (tcp_conn->in.datalen) { | |
728 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
5d6ac29b | 729 | struct ahash_request *rx_hash = NULL; |
ae3d56d8 | 730 | struct scsi_data_buffer *sdb = &task->sc->sdb; |
a081c13e MC |
731 | |
732 | /* | |
91ebc1fa | 733 | * Setup copy of Data-In into the struct scsi_cmnd |
a081c13e MC |
734 | * Scatterlist case: |
735 | * We set up the iscsi_segment to point to the next | |
736 | * scatterlist entry to copy to. As we go along, | |
737 | * we move on to the next scatterlist entry and | |
738 | * update the digest per-entry. | |
739 | */ | |
740 | if (conn->datadgst_en && | |
741 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
742 | rx_hash = tcp_conn->rx_hash; | |
743 | ||
0ab1c252 MC |
744 | ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( " |
745 | "offset=%d, datalen=%d)\n", | |
746 | tcp_task->data_offset, | |
747 | tcp_conn->in.datalen); | |
d355e57d | 748 | task->last_xfer = jiffies; |
a081c13e MC |
749 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
750 | sdb->table.sgl, | |
751 | sdb->table.nents, | |
752 | tcp_task->data_offset, | |
753 | tcp_conn->in.datalen, | |
754 | iscsi_tcp_process_data_in, | |
755 | rx_hash); | |
659743b0 | 756 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
757 | return rc; |
758 | } | |
759 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
659743b0 | 760 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
761 | break; |
762 | case ISCSI_OP_SCSI_CMD_RSP: | |
763 | if (tcp_conn->in.datalen) { | |
764 | iscsi_tcp_data_recv_prep(tcp_conn); | |
765 | return 0; | |
766 | } | |
767 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
768 | break; | |
769 | case ISCSI_OP_R2T: | |
5923d64b | 770 | if (ahslen) { |
a081c13e | 771 | rc = ISCSI_ERR_AHSLEN; |
5923d64b MC |
772 | break; |
773 | } | |
774 | rc = iscsi_tcp_r2t_rsp(conn, hdr); | |
a081c13e MC |
775 | break; |
776 | case ISCSI_OP_LOGIN_RSP: | |
777 | case ISCSI_OP_TEXT_RSP: | |
778 | case ISCSI_OP_REJECT: | |
779 | case ISCSI_OP_ASYNC_EVENT: | |
780 | /* | |
781 | * It is possible that we could get a PDU with a buffer larger | |
782 | * than 8K, but there are no targets that currently do this. | |
783 | * For now we fail until we find a vendor that needs it | |
784 | */ | |
785 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
786 | iscsi_conn_printk(KERN_ERR, conn, | |
787 | "iscsi_tcp: received buffer of " | |
788 | "len %u but conn buffer is only %u " | |
789 | "(opcode %0x)\n", | |
790 | tcp_conn->in.datalen, | |
791 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
792 | rc = ISCSI_ERR_PROTO; | |
793 | break; | |
794 | } | |
795 | ||
796 | /* If there's data coming in with the response, | |
797 | * receive it to the connection's buffer. | |
798 | */ | |
799 | if (tcp_conn->in.datalen) { | |
800 | iscsi_tcp_data_recv_prep(tcp_conn); | |
801 | return 0; | |
802 | } | |
df561f66 | 803 | fallthrough; |
a081c13e MC |
804 | case ISCSI_OP_LOGOUT_RSP: |
805 | case ISCSI_OP_NOOP_IN: | |
806 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
807 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
808 | break; | |
809 | default: | |
810 | rc = ISCSI_ERR_BAD_OPCODE; | |
811 | break; | |
812 | } | |
813 | ||
814 | if (rc == 0) { | |
815 | /* Anything that comes with data should have | |
816 | * been handled above. */ | |
817 | if (tcp_conn->in.datalen) | |
818 | return ISCSI_ERR_PROTO; | |
819 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
820 | } | |
821 | ||
822 | return rc; | |
823 | } | |
824 | ||
825 | /** | |
826 | * iscsi_tcp_hdr_recv_done - process PDU header | |
ccd4a430 RD |
827 | * @tcp_conn: iSCSI TCP connection |
828 | * @segment: the buffer segment being processed | |
a081c13e MC |
829 | * |
830 | * This is the callback invoked when the PDU header has | |
831 | * been received. If the header is followed by additional | |
832 | * header segments, we go back for more data. | |
833 | */ | |
834 | static int | |
835 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
836 | struct iscsi_segment *segment) | |
837 | { | |
838 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
839 | struct iscsi_hdr *hdr; | |
840 | ||
841 | /* Check if there are additional header segments | |
842 | * *prior* to computing the digest, because we | |
843 | * may need to go back to the caller for more. | |
844 | */ | |
845 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
846 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
847 | /* Bump the header length - the caller will | |
848 | * just loop around and get the AHS for us, and | |
849 | * call again. */ | |
850 | unsigned int ahslen = hdr->hlength << 2; | |
851 | ||
852 | /* Make sure we don't overflow */ | |
853 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
854 | return ISCSI_ERR_AHSLEN; | |
855 | ||
856 | segment->total_size += ahslen; | |
857 | segment->size += ahslen; | |
858 | return 0; | |
859 | } | |
860 | ||
861 | /* We're done processing the header. See if we're doing | |
862 | * header digests; if so, set up the recv_digest buffer | |
863 | * and go back for more. */ | |
6df19a79 MC |
864 | if (conn->hdrdgst_en && |
865 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { | |
a081c13e MC |
866 | if (segment->digest_len == 0) { |
867 | /* | |
868 | * Even if we offload the digest processing we | |
869 | * splice it in so we can increment the skb/segment | |
870 | * counters in preparation for the data segment. | |
871 | */ | |
872 | iscsi_tcp_segment_splice_digest(segment, | |
873 | segment->recv_digest); | |
874 | return 0; | |
875 | } | |
876 | ||
6df19a79 MC |
877 | iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr, |
878 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
879 | segment->digest); | |
a081c13e | 880 | |
6df19a79 MC |
881 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
882 | return ISCSI_ERR_HDR_DGST; | |
a081c13e MC |
883 | } |
884 | ||
885 | tcp_conn->in.hdr = hdr; | |
886 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
887 | } | |
888 | ||
889 | /** | |
890 | * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header | |
891 | * @tcp_conn: iscsi tcp conn | |
892 | * | |
893 | * returns non zero if we are currently processing or setup to process | |
894 | * a header. | |
895 | */ | |
896 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) | |
897 | { | |
898 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr); | |
901 | ||
902 | /** | |
903 | * iscsi_tcp_recv_skb - Process skb | |
904 | * @conn: iscsi connection | |
905 | * @skb: network buffer with header and/or data segment | |
906 | * @offset: offset in skb | |
ccd4a430 RD |
907 | * @offloaded: bool indicating if transfer was offloaded |
908 | * @status: iscsi TCP status result | |
a081c13e | 909 | * |
ccd4a430 | 910 | * Will return status of transfer in @status. And will return |
a081c13e MC |
911 | * number of bytes copied. |
912 | */ | |
913 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
914 | unsigned int offset, bool offloaded, int *status) | |
915 | { | |
916 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
917 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
918 | struct skb_seq_state seq; | |
919 | unsigned int consumed = 0; | |
920 | int rc = 0; | |
921 | ||
0ab1c252 | 922 | ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset); |
d1acfae5 MC |
923 | /* |
924 | * Update for each skb instead of pdu, because over slow networks a | |
925 | * data_in's data could take a while to read in. We also want to | |
926 | * account for r2ts. | |
927 | */ | |
928 | conn->last_recv = jiffies; | |
a081c13e MC |
929 | |
930 | if (unlikely(conn->suspend_rx)) { | |
0ab1c252 | 931 | ISCSI_DBG_TCP(conn, "Rx suspended!\n"); |
a081c13e MC |
932 | *status = ISCSI_TCP_SUSPENDED; |
933 | return 0; | |
934 | } | |
935 | ||
936 | if (offloaded) { | |
937 | segment->total_copied = segment->total_size; | |
938 | goto segment_done; | |
939 | } | |
940 | ||
941 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
942 | while (1) { | |
943 | unsigned int avail; | |
944 | const u8 *ptr; | |
945 | ||
946 | avail = skb_seq_read(consumed, &ptr, &seq); | |
947 | if (avail == 0) { | |
0ab1c252 MC |
948 | ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", |
949 | consumed); | |
a081c13e | 950 | *status = ISCSI_TCP_SKB_DONE; |
a081c13e MC |
951 | goto skb_done; |
952 | } | |
953 | BUG_ON(segment->copied >= segment->size); | |
954 | ||
0ab1c252 MC |
955 | ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr, |
956 | avail); | |
a081c13e MC |
957 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
958 | BUG_ON(rc == 0); | |
959 | consumed += rc; | |
960 | ||
961 | if (segment->total_copied >= segment->total_size) { | |
962 | skb_abort_seq_read(&seq); | |
963 | goto segment_done; | |
964 | } | |
965 | } | |
966 | ||
967 | segment_done: | |
968 | *status = ISCSI_TCP_SEGMENT_DONE; | |
0ab1c252 | 969 | ISCSI_DBG_TCP(conn, "segment done\n"); |
a081c13e MC |
970 | rc = segment->done(tcp_conn, segment); |
971 | if (rc != 0) { | |
972 | *status = ISCSI_TCP_CONN_ERR; | |
0ab1c252 | 973 | ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc); |
a081c13e MC |
974 | iscsi_conn_failure(conn, rc); |
975 | return 0; | |
976 | } | |
977 | /* The done() functions sets up the next segment. */ | |
978 | ||
979 | skb_done: | |
980 | conn->rxdata_octets += consumed; | |
981 | return consumed; | |
982 | } | |
983 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
984 | ||
985 | /** | |
986 | * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
a081c13e | 987 | * @task: scsi command task |
a081c13e MC |
988 | */ |
989 | int iscsi_tcp_task_init(struct iscsi_task *task) | |
990 | { | |
991 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
992 | struct iscsi_conn *conn = task->conn; | |
993 | struct scsi_cmnd *sc = task->sc; | |
994 | int err; | |
995 | ||
996 | if (!sc) { | |
997 | /* | |
998 | * mgmt tasks do not have a scatterlist since they come | |
999 | * in from the iscsi interface. | |
1000 | */ | |
0ab1c252 | 1001 | ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt); |
a081c13e MC |
1002 | |
1003 | return conn->session->tt->init_pdu(task, 0, task->data_count); | |
1004 | } | |
1005 | ||
e64c026d | 1006 | BUG_ON(kfifo_len(&tcp_task->r2tqueue)); |
a081c13e MC |
1007 | tcp_task->exp_datasn = 0; |
1008 | ||
1009 | /* Prepare PDU, optionally w/ immediate data */ | |
0ab1c252 MC |
1010 | ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n", |
1011 | task->itt, task->imm_count, task->unsol_r2t.data_length); | |
a081c13e MC |
1012 | |
1013 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); | |
1014 | if (err) | |
1015 | return err; | |
1016 | task->imm_count = 0; | |
1017 | return 0; | |
1018 | } | |
1019 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_init); | |
1020 | ||
1021 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) | |
1022 | { | |
a081c13e MC |
1023 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
1024 | struct iscsi_r2t_info *r2t = NULL; | |
1025 | ||
1026 | if (iscsi_task_has_unsol_data(task)) | |
1027 | r2t = &task->unsol_r2t; | |
1028 | else { | |
659743b0 | 1029 | spin_lock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1030 | if (tcp_task->r2t) { |
1031 | r2t = tcp_task->r2t; | |
1032 | /* Continue with this R2T? */ | |
1033 | if (r2t->data_length <= r2t->sent) { | |
0ab1c252 MC |
1034 | ISCSI_DBG_TCP(task->conn, |
1035 | " done with r2t %p\n", r2t); | |
7acd72eb | 1036 | kfifo_in(&tcp_task->r2tpool.queue, |
a081c13e MC |
1037 | (void *)&tcp_task->r2t, |
1038 | sizeof(void *)); | |
1039 | tcp_task->r2t = r2t = NULL; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | if (r2t == NULL) { | |
9842c38e SS |
1044 | if (kfifo_out(&tcp_task->r2tqueue, |
1045 | (void *)&tcp_task->r2t, sizeof(void *)) != | |
fee099b2 | 1046 | sizeof(void *)) |
9842c38e | 1047 | r2t = NULL; |
fee099b2 MC |
1048 | else |
1049 | r2t = tcp_task->r2t; | |
a081c13e | 1050 | } |
659743b0 | 1051 | spin_unlock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1052 | } |
1053 | ||
1054 | return r2t; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * iscsi_tcp_task_xmit - xmit normal PDU task | |
1059 | * @task: iscsi command task | |
1060 | * | |
af901ca1 | 1061 | * We're expected to return 0 when everything was transmitted successfully, |
a081c13e MC |
1062 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind |
1063 | * of error. | |
1064 | */ | |
1065 | int iscsi_tcp_task_xmit(struct iscsi_task *task) | |
1066 | { | |
1067 | struct iscsi_conn *conn = task->conn; | |
1068 | struct iscsi_session *session = conn->session; | |
1069 | struct iscsi_r2t_info *r2t; | |
1070 | int rc = 0; | |
1071 | ||
1072 | flush: | |
1073 | /* Flush any pending data first. */ | |
1074 | rc = session->tt->xmit_pdu(task); | |
1075 | if (rc < 0) | |
1076 | return rc; | |
1077 | ||
1078 | /* mgmt command */ | |
1079 | if (!task->sc) { | |
1080 | if (task->hdr->itt == RESERVED_ITT) | |
1081 | iscsi_put_task(task); | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | /* Are we done already? */ | |
1086 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) | |
1087 | return 0; | |
1088 | ||
1089 | r2t = iscsi_tcp_get_curr_r2t(task); | |
1090 | if (r2t == NULL) { | |
1091 | /* Waiting for more R2Ts to arrive. */ | |
0ab1c252 | 1092 | ISCSI_DBG_TCP(conn, "no R2Ts yet\n"); |
a081c13e MC |
1093 | return 0; |
1094 | } | |
1095 | ||
2ff79d52 | 1096 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT); |
a081c13e MC |
1097 | if (rc) |
1098 | return rc; | |
1099 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
1100 | ||
0ab1c252 MC |
1101 | ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1102 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1103 | r2t->data_offset + r2t->sent, r2t->data_count); | |
a081c13e MC |
1104 | |
1105 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, | |
1106 | r2t->data_count); | |
9a6510eb MC |
1107 | if (rc) { |
1108 | iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED); | |
a081c13e | 1109 | return rc; |
9a6510eb MC |
1110 | } |
1111 | ||
a081c13e MC |
1112 | r2t->sent += r2t->data_count; |
1113 | goto flush; | |
1114 | } | |
1115 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit); | |
1116 | ||
1117 | struct iscsi_cls_conn * | |
1118 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
1119 | uint32_t conn_idx) | |
1120 | ||
1121 | { | |
1122 | struct iscsi_conn *conn; | |
1123 | struct iscsi_cls_conn *cls_conn; | |
1124 | struct iscsi_tcp_conn *tcp_conn; | |
1125 | ||
74dcd0ec MC |
1126 | cls_conn = iscsi_conn_setup(cls_session, |
1127 | sizeof(*tcp_conn) + dd_data_size, conn_idx); | |
a081c13e MC |
1128 | if (!cls_conn) |
1129 | return NULL; | |
1130 | conn = cls_conn->dd_data; | |
1131 | /* | |
1132 | * due to strange issues with iser these are not set | |
1133 | * in iscsi_conn_setup | |
1134 | */ | |
1135 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1136 | ||
1137 | tcp_conn = conn->dd_data; | |
1138 | tcp_conn->iscsi_conn = conn; | |
74dcd0ec | 1139 | tcp_conn->dd_data = conn->dd_data + sizeof(*tcp_conn); |
a081c13e MC |
1140 | return cls_conn; |
1141 | } | |
1142 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup); | |
1143 | ||
1144 | void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1145 | { | |
a081c13e MC |
1146 | iscsi_conn_teardown(cls_conn); |
1147 | } | |
1148 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown); | |
1149 | ||
1150 | int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session) | |
1151 | { | |
1152 | int i; | |
1153 | int cmd_i; | |
1154 | ||
1155 | /* | |
1156 | * initialize per-task: R2T pool and xmit queue | |
1157 | */ | |
1158 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1159 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1160 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1161 | ||
1162 | /* | |
1163 | * pre-allocated x2 as much r2ts to handle race when | |
1164 | * target acks DataOut faster than we data_xmit() queues | |
1165 | * could replenish r2tqueue. | |
1166 | */ | |
1167 | ||
1168 | /* R2T pool */ | |
1169 | if (iscsi_pool_init(&tcp_task->r2tpool, | |
1170 | session->max_r2t * 2, NULL, | |
1171 | sizeof(struct iscsi_r2t_info))) { | |
1172 | goto r2t_alloc_fail; | |
1173 | } | |
1174 | ||
1175 | /* R2T xmit queue */ | |
45465487 | 1176 | if (kfifo_alloc(&tcp_task->r2tqueue, |
c1e13f25 | 1177 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) { |
a081c13e MC |
1178 | iscsi_pool_free(&tcp_task->r2tpool); |
1179 | goto r2t_alloc_fail; | |
1180 | } | |
659743b0 SP |
1181 | spin_lock_init(&tcp_task->pool2queue); |
1182 | spin_lock_init(&tcp_task->queue2pool); | |
a081c13e MC |
1183 | } |
1184 | ||
1185 | return 0; | |
1186 | ||
1187 | r2t_alloc_fail: | |
1188 | for (i = 0; i < cmd_i; i++) { | |
1189 | struct iscsi_task *task = session->cmds[i]; | |
1190 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1191 | ||
45465487 | 1192 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1193 | iscsi_pool_free(&tcp_task->r2tpool); |
1194 | } | |
1195 | return -ENOMEM; | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc); | |
1198 | ||
1199 | void iscsi_tcp_r2tpool_free(struct iscsi_session *session) | |
1200 | { | |
1201 | int i; | |
1202 | ||
1203 | for (i = 0; i < session->cmds_max; i++) { | |
1204 | struct iscsi_task *task = session->cmds[i]; | |
1205 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1206 | ||
45465487 | 1207 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1208 | iscsi_pool_free(&tcp_task->r2tpool); |
1209 | } | |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free); | |
1212 | ||
1304be5f MC |
1213 | int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf) |
1214 | { | |
1215 | struct iscsi_session *session = conn->session; | |
1216 | unsigned short r2ts = 0; | |
1217 | ||
1218 | sscanf(buf, "%hu", &r2ts); | |
1219 | if (session->max_r2t == r2ts) | |
1220 | return 0; | |
1221 | ||
1222 | if (!r2ts || !is_power_of_2(r2ts)) | |
1223 | return -EINVAL; | |
1224 | ||
1225 | session->max_r2t = r2ts; | |
1226 | iscsi_tcp_r2tpool_free(session); | |
1227 | return iscsi_tcp_r2tpool_alloc(session); | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(iscsi_tcp_set_max_r2t); | |
1230 | ||
a081c13e MC |
1231 | void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
1232 | struct iscsi_stats *stats) | |
1233 | { | |
1234 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1235 | ||
1236 | stats->txdata_octets = conn->txdata_octets; | |
1237 | stats->rxdata_octets = conn->rxdata_octets; | |
1238 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1239 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1240 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1241 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1242 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1243 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1244 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats); |