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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 | */ |
08b11eac | 131 | if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(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 | |
527 | * @task: scsi command task | |
528 | */ | |
529 | static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task) | |
530 | { | |
531 | struct iscsi_session *session = conn->session; | |
532 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
533 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
534 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
535 | struct iscsi_r2t_info *r2t; | |
536 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
5d0fddd0 SP |
537 | u32 data_length; |
538 | u32 data_offset; | |
a081c13e MC |
539 | int rc; |
540 | ||
541 | if (tcp_conn->in.datalen) { | |
542 | iscsi_conn_printk(KERN_ERR, conn, | |
543 | "invalid R2t with datalen %d\n", | |
544 | tcp_conn->in.datalen); | |
545 | return ISCSI_ERR_DATALEN; | |
546 | } | |
547 | ||
548 | if (tcp_task->exp_datasn != r2tsn){ | |
0ab1c252 MC |
549 | ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n", |
550 | tcp_task->exp_datasn, r2tsn); | |
a081c13e MC |
551 | return ISCSI_ERR_R2TSN; |
552 | } | |
553 | ||
554 | /* fill-in new R2T associated with the task */ | |
555 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
556 | ||
557 | if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) { | |
558 | iscsi_conn_printk(KERN_INFO, conn, | |
559 | "dropping R2T itt %d in recovery.\n", | |
560 | task->itt); | |
561 | return 0; | |
562 | } | |
563 | ||
5d0fddd0 SP |
564 | data_length = be32_to_cpu(rhdr->data_length); |
565 | if (data_length == 0) { | |
a081c13e MC |
566 | iscsi_conn_printk(KERN_ERR, conn, |
567 | "invalid R2T with zero data len\n"); | |
a081c13e MC |
568 | return ISCSI_ERR_DATALEN; |
569 | } | |
570 | ||
5d0fddd0 | 571 | if (data_length > session->max_burst) |
0ab1c252 MC |
572 | ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max " |
573 | "burst %u. Attempting to execute request.\n", | |
5d0fddd0 | 574 | data_length, session->max_burst); |
a081c13e | 575 | |
5d0fddd0 | 576 | data_offset = be32_to_cpu(rhdr->data_offset); |
ae3d56d8 | 577 | if (data_offset + data_length > task->sc->sdb.length) { |
a081c13e MC |
578 | iscsi_conn_printk(KERN_ERR, conn, |
579 | "invalid R2T with data len %u at offset %u " | |
5d0fddd0 | 580 | "and total length %d\n", data_length, |
ae3d56d8 | 581 | data_offset, task->sc->sdb.length); |
a081c13e MC |
582 | return ISCSI_ERR_DATALEN; |
583 | } | |
584 | ||
659743b0 | 585 | spin_lock(&tcp_task->pool2queue); |
5d0fddd0 SP |
586 | rc = kfifo_out(&tcp_task->r2tpool.queue, (void *)&r2t, sizeof(void *)); |
587 | if (!rc) { | |
588 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. " | |
589 | "Target has sent more R2Ts than it " | |
590 | "negotiated for or driver has leaked.\n"); | |
659743b0 | 591 | spin_unlock(&tcp_task->pool2queue); |
5d0fddd0 SP |
592 | return ISCSI_ERR_PROTO; |
593 | } | |
594 | ||
595 | r2t->exp_statsn = rhdr->statsn; | |
596 | r2t->data_length = data_length; | |
597 | r2t->data_offset = data_offset; | |
598 | ||
a081c13e MC |
599 | r2t->ttt = rhdr->ttt; /* no flip */ |
600 | r2t->datasn = 0; | |
601 | r2t->sent = 0; | |
602 | ||
603 | tcp_task->exp_datasn = r2tsn + 1; | |
7acd72eb | 604 | kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*)); |
a081c13e | 605 | conn->r2t_pdus_cnt++; |
659743b0 | 606 | spin_unlock(&tcp_task->pool2queue); |
a081c13e MC |
607 | |
608 | iscsi_requeue_task(task); | |
609 | return 0; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Handle incoming reply to DataIn command | |
614 | */ | |
615 | static int | |
616 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
617 | struct iscsi_segment *segment) | |
618 | { | |
619 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
620 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
621 | int rc; | |
622 | ||
623 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) | |
624 | return ISCSI_ERR_DATA_DGST; | |
625 | ||
626 | /* check for non-exceptional status */ | |
627 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
628 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
629 | if (rc) | |
630 | return rc; | |
631 | } | |
632 | ||
633 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * iscsi_tcp_hdr_dissect - process PDU header | |
639 | * @conn: iSCSI connection | |
640 | * @hdr: PDU header | |
641 | * | |
642 | * This function analyzes the header of the PDU received, | |
643 | * and performs several sanity checks. If the PDU is accompanied | |
644 | * by data, the receive buffer is set up to copy the incoming data | |
645 | * to the correct location. | |
646 | */ | |
647 | static int | |
648 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
649 | { | |
650 | int rc = 0, opcode, ahslen; | |
651 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
652 | struct iscsi_task *task; | |
653 | ||
654 | /* verify PDU length */ | |
655 | tcp_conn->in.datalen = ntoh24(hdr->dlength); | |
656 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
657 | iscsi_conn_printk(KERN_ERR, conn, | |
658 | "iscsi_tcp: datalen %d > %d\n", | |
659 | tcp_conn->in.datalen, conn->max_recv_dlength); | |
660 | return ISCSI_ERR_DATALEN; | |
661 | } | |
662 | ||
663 | /* Additional header segments. So far, we don't | |
664 | * process additional headers. | |
665 | */ | |
666 | ahslen = hdr->hlength << 2; | |
667 | ||
668 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
669 | /* verify itt (itt encoding: age+cid+itt) */ | |
670 | rc = iscsi_verify_itt(conn, hdr->itt); | |
671 | if (rc) | |
672 | return rc; | |
673 | ||
0ab1c252 MC |
674 | ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n", |
675 | opcode, ahslen, tcp_conn->in.datalen); | |
a081c13e MC |
676 | |
677 | switch(opcode) { | |
678 | case ISCSI_OP_SCSI_DATA_IN: | |
659743b0 | 679 | spin_lock(&conn->session->back_lock); |
a081c13e MC |
680 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
681 | if (!task) | |
682 | rc = ISCSI_ERR_BAD_ITT; | |
683 | else | |
684 | rc = iscsi_tcp_data_in(conn, task); | |
685 | if (rc) { | |
659743b0 | 686 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
687 | break; |
688 | } | |
689 | ||
690 | if (tcp_conn->in.datalen) { | |
691 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
5d6ac29b | 692 | struct ahash_request *rx_hash = NULL; |
ae3d56d8 | 693 | struct scsi_data_buffer *sdb = &task->sc->sdb; |
a081c13e MC |
694 | |
695 | /* | |
91ebc1fa | 696 | * Setup copy of Data-In into the struct scsi_cmnd |
a081c13e MC |
697 | * Scatterlist case: |
698 | * We set up the iscsi_segment to point to the next | |
699 | * scatterlist entry to copy to. As we go along, | |
700 | * we move on to the next scatterlist entry and | |
701 | * update the digest per-entry. | |
702 | */ | |
703 | if (conn->datadgst_en && | |
704 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) | |
705 | rx_hash = tcp_conn->rx_hash; | |
706 | ||
0ab1c252 MC |
707 | ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( " |
708 | "offset=%d, datalen=%d)\n", | |
709 | tcp_task->data_offset, | |
710 | tcp_conn->in.datalen); | |
d355e57d | 711 | task->last_xfer = jiffies; |
a081c13e MC |
712 | rc = iscsi_segment_seek_sg(&tcp_conn->in.segment, |
713 | sdb->table.sgl, | |
714 | sdb->table.nents, | |
715 | tcp_task->data_offset, | |
716 | tcp_conn->in.datalen, | |
717 | iscsi_tcp_process_data_in, | |
718 | rx_hash); | |
659743b0 | 719 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
720 | return rc; |
721 | } | |
722 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
659743b0 | 723 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
724 | break; |
725 | case ISCSI_OP_SCSI_CMD_RSP: | |
726 | if (tcp_conn->in.datalen) { | |
727 | iscsi_tcp_data_recv_prep(tcp_conn); | |
728 | return 0; | |
729 | } | |
730 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
731 | break; | |
732 | case ISCSI_OP_R2T: | |
659743b0 | 733 | spin_lock(&conn->session->back_lock); |
a081c13e | 734 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
659743b0 | 735 | spin_unlock(&conn->session->back_lock); |
a081c13e MC |
736 | if (!task) |
737 | rc = ISCSI_ERR_BAD_ITT; | |
738 | else if (ahslen) | |
739 | rc = ISCSI_ERR_AHSLEN; | |
d355e57d MC |
740 | else if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
741 | task->last_xfer = jiffies; | |
659743b0 | 742 | spin_lock(&conn->session->frwd_lock); |
a081c13e | 743 | rc = iscsi_tcp_r2t_rsp(conn, task); |
659743b0 | 744 | spin_unlock(&conn->session->frwd_lock); |
d355e57d | 745 | } else |
a081c13e | 746 | rc = ISCSI_ERR_PROTO; |
a081c13e MC |
747 | break; |
748 | case ISCSI_OP_LOGIN_RSP: | |
749 | case ISCSI_OP_TEXT_RSP: | |
750 | case ISCSI_OP_REJECT: | |
751 | case ISCSI_OP_ASYNC_EVENT: | |
752 | /* | |
753 | * It is possible that we could get a PDU with a buffer larger | |
754 | * than 8K, but there are no targets that currently do this. | |
755 | * For now we fail until we find a vendor that needs it | |
756 | */ | |
757 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { | |
758 | iscsi_conn_printk(KERN_ERR, conn, | |
759 | "iscsi_tcp: received buffer of " | |
760 | "len %u but conn buffer is only %u " | |
761 | "(opcode %0x)\n", | |
762 | tcp_conn->in.datalen, | |
763 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); | |
764 | rc = ISCSI_ERR_PROTO; | |
765 | break; | |
766 | } | |
767 | ||
768 | /* If there's data coming in with the response, | |
769 | * receive it to the connection's buffer. | |
770 | */ | |
771 | if (tcp_conn->in.datalen) { | |
772 | iscsi_tcp_data_recv_prep(tcp_conn); | |
773 | return 0; | |
774 | } | |
775 | /* fall through */ | |
776 | case ISCSI_OP_LOGOUT_RSP: | |
777 | case ISCSI_OP_NOOP_IN: | |
778 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
779 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
780 | break; | |
781 | default: | |
782 | rc = ISCSI_ERR_BAD_OPCODE; | |
783 | break; | |
784 | } | |
785 | ||
786 | if (rc == 0) { | |
787 | /* Anything that comes with data should have | |
788 | * been handled above. */ | |
789 | if (tcp_conn->in.datalen) | |
790 | return ISCSI_ERR_PROTO; | |
791 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
792 | } | |
793 | ||
794 | return rc; | |
795 | } | |
796 | ||
797 | /** | |
798 | * iscsi_tcp_hdr_recv_done - process PDU header | |
ccd4a430 RD |
799 | * @tcp_conn: iSCSI TCP connection |
800 | * @segment: the buffer segment being processed | |
a081c13e MC |
801 | * |
802 | * This is the callback invoked when the PDU header has | |
803 | * been received. If the header is followed by additional | |
804 | * header segments, we go back for more data. | |
805 | */ | |
806 | static int | |
807 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
808 | struct iscsi_segment *segment) | |
809 | { | |
810 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
811 | struct iscsi_hdr *hdr; | |
812 | ||
813 | /* Check if there are additional header segments | |
814 | * *prior* to computing the digest, because we | |
815 | * may need to go back to the caller for more. | |
816 | */ | |
817 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
818 | if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
819 | /* Bump the header length - the caller will | |
820 | * just loop around and get the AHS for us, and | |
821 | * call again. */ | |
822 | unsigned int ahslen = hdr->hlength << 2; | |
823 | ||
824 | /* Make sure we don't overflow */ | |
825 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
826 | return ISCSI_ERR_AHSLEN; | |
827 | ||
828 | segment->total_size += ahslen; | |
829 | segment->size += ahslen; | |
830 | return 0; | |
831 | } | |
832 | ||
833 | /* We're done processing the header. See if we're doing | |
834 | * header digests; if so, set up the recv_digest buffer | |
835 | * and go back for more. */ | |
6df19a79 MC |
836 | if (conn->hdrdgst_en && |
837 | !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) { | |
a081c13e MC |
838 | if (segment->digest_len == 0) { |
839 | /* | |
840 | * Even if we offload the digest processing we | |
841 | * splice it in so we can increment the skb/segment | |
842 | * counters in preparation for the data segment. | |
843 | */ | |
844 | iscsi_tcp_segment_splice_digest(segment, | |
845 | segment->recv_digest); | |
846 | return 0; | |
847 | } | |
848 | ||
6df19a79 MC |
849 | iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr, |
850 | segment->total_copied - ISCSI_DIGEST_SIZE, | |
851 | segment->digest); | |
a081c13e | 852 | |
6df19a79 MC |
853 | if (!iscsi_tcp_dgst_verify(tcp_conn, segment)) |
854 | return ISCSI_ERR_HDR_DGST; | |
a081c13e MC |
855 | } |
856 | ||
857 | tcp_conn->in.hdr = hdr; | |
858 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
859 | } | |
860 | ||
861 | /** | |
862 | * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header | |
863 | * @tcp_conn: iscsi tcp conn | |
864 | * | |
865 | * returns non zero if we are currently processing or setup to process | |
866 | * a header. | |
867 | */ | |
868 | inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn) | |
869 | { | |
870 | return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done; | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr); | |
873 | ||
874 | /** | |
875 | * iscsi_tcp_recv_skb - Process skb | |
876 | * @conn: iscsi connection | |
877 | * @skb: network buffer with header and/or data segment | |
878 | * @offset: offset in skb | |
ccd4a430 RD |
879 | * @offloaded: bool indicating if transfer was offloaded |
880 | * @status: iscsi TCP status result | |
a081c13e | 881 | * |
ccd4a430 | 882 | * Will return status of transfer in @status. And will return |
a081c13e MC |
883 | * number of bytes copied. |
884 | */ | |
885 | int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb, | |
886 | unsigned int offset, bool offloaded, int *status) | |
887 | { | |
888 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
889 | struct iscsi_segment *segment = &tcp_conn->in.segment; | |
890 | struct skb_seq_state seq; | |
891 | unsigned int consumed = 0; | |
892 | int rc = 0; | |
893 | ||
0ab1c252 | 894 | ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset); |
d1acfae5 MC |
895 | /* |
896 | * Update for each skb instead of pdu, because over slow networks a | |
897 | * data_in's data could take a while to read in. We also want to | |
898 | * account for r2ts. | |
899 | */ | |
900 | conn->last_recv = jiffies; | |
a081c13e MC |
901 | |
902 | if (unlikely(conn->suspend_rx)) { | |
0ab1c252 | 903 | ISCSI_DBG_TCP(conn, "Rx suspended!\n"); |
a081c13e MC |
904 | *status = ISCSI_TCP_SUSPENDED; |
905 | return 0; | |
906 | } | |
907 | ||
908 | if (offloaded) { | |
909 | segment->total_copied = segment->total_size; | |
910 | goto segment_done; | |
911 | } | |
912 | ||
913 | skb_prepare_seq_read(skb, offset, skb->len, &seq); | |
914 | while (1) { | |
915 | unsigned int avail; | |
916 | const u8 *ptr; | |
917 | ||
918 | avail = skb_seq_read(consumed, &ptr, &seq); | |
919 | if (avail == 0) { | |
0ab1c252 MC |
920 | ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n", |
921 | consumed); | |
a081c13e | 922 | *status = ISCSI_TCP_SKB_DONE; |
a081c13e MC |
923 | goto skb_done; |
924 | } | |
925 | BUG_ON(segment->copied >= segment->size); | |
926 | ||
0ab1c252 MC |
927 | ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr, |
928 | avail); | |
a081c13e MC |
929 | rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail); |
930 | BUG_ON(rc == 0); | |
931 | consumed += rc; | |
932 | ||
933 | if (segment->total_copied >= segment->total_size) { | |
934 | skb_abort_seq_read(&seq); | |
935 | goto segment_done; | |
936 | } | |
937 | } | |
938 | ||
939 | segment_done: | |
940 | *status = ISCSI_TCP_SEGMENT_DONE; | |
0ab1c252 | 941 | ISCSI_DBG_TCP(conn, "segment done\n"); |
a081c13e MC |
942 | rc = segment->done(tcp_conn, segment); |
943 | if (rc != 0) { | |
944 | *status = ISCSI_TCP_CONN_ERR; | |
0ab1c252 | 945 | ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc); |
a081c13e MC |
946 | iscsi_conn_failure(conn, rc); |
947 | return 0; | |
948 | } | |
949 | /* The done() functions sets up the next segment. */ | |
950 | ||
951 | skb_done: | |
952 | conn->rxdata_octets += consumed; | |
953 | return consumed; | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb); | |
956 | ||
957 | /** | |
958 | * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
a081c13e | 959 | * @task: scsi command task |
a081c13e MC |
960 | */ |
961 | int iscsi_tcp_task_init(struct iscsi_task *task) | |
962 | { | |
963 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
964 | struct iscsi_conn *conn = task->conn; | |
965 | struct scsi_cmnd *sc = task->sc; | |
966 | int err; | |
967 | ||
968 | if (!sc) { | |
969 | /* | |
970 | * mgmt tasks do not have a scatterlist since they come | |
971 | * in from the iscsi interface. | |
972 | */ | |
0ab1c252 | 973 | ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt); |
a081c13e MC |
974 | |
975 | return conn->session->tt->init_pdu(task, 0, task->data_count); | |
976 | } | |
977 | ||
e64c026d | 978 | BUG_ON(kfifo_len(&tcp_task->r2tqueue)); |
a081c13e MC |
979 | tcp_task->exp_datasn = 0; |
980 | ||
981 | /* Prepare PDU, optionally w/ immediate data */ | |
0ab1c252 MC |
982 | ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n", |
983 | task->itt, task->imm_count, task->unsol_r2t.data_length); | |
a081c13e MC |
984 | |
985 | err = conn->session->tt->init_pdu(task, 0, task->imm_count); | |
986 | if (err) | |
987 | return err; | |
988 | task->imm_count = 0; | |
989 | return 0; | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_init); | |
992 | ||
993 | static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task) | |
994 | { | |
a081c13e MC |
995 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
996 | struct iscsi_r2t_info *r2t = NULL; | |
997 | ||
998 | if (iscsi_task_has_unsol_data(task)) | |
999 | r2t = &task->unsol_r2t; | |
1000 | else { | |
659743b0 | 1001 | spin_lock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1002 | if (tcp_task->r2t) { |
1003 | r2t = tcp_task->r2t; | |
1004 | /* Continue with this R2T? */ | |
1005 | if (r2t->data_length <= r2t->sent) { | |
0ab1c252 MC |
1006 | ISCSI_DBG_TCP(task->conn, |
1007 | " done with r2t %p\n", r2t); | |
7acd72eb | 1008 | kfifo_in(&tcp_task->r2tpool.queue, |
a081c13e MC |
1009 | (void *)&tcp_task->r2t, |
1010 | sizeof(void *)); | |
1011 | tcp_task->r2t = r2t = NULL; | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | if (r2t == NULL) { | |
9842c38e SS |
1016 | if (kfifo_out(&tcp_task->r2tqueue, |
1017 | (void *)&tcp_task->r2t, sizeof(void *)) != | |
fee099b2 | 1018 | sizeof(void *)) |
9842c38e | 1019 | r2t = NULL; |
fee099b2 MC |
1020 | else |
1021 | r2t = tcp_task->r2t; | |
a081c13e | 1022 | } |
659743b0 | 1023 | spin_unlock_bh(&tcp_task->queue2pool); |
a081c13e MC |
1024 | } |
1025 | ||
1026 | return r2t; | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * iscsi_tcp_task_xmit - xmit normal PDU task | |
1031 | * @task: iscsi command task | |
1032 | * | |
af901ca1 | 1033 | * We're expected to return 0 when everything was transmitted successfully, |
a081c13e MC |
1034 | * -EAGAIN if there's still data in the queue, or != 0 for any other kind |
1035 | * of error. | |
1036 | */ | |
1037 | int iscsi_tcp_task_xmit(struct iscsi_task *task) | |
1038 | { | |
1039 | struct iscsi_conn *conn = task->conn; | |
1040 | struct iscsi_session *session = conn->session; | |
1041 | struct iscsi_r2t_info *r2t; | |
1042 | int rc = 0; | |
1043 | ||
1044 | flush: | |
1045 | /* Flush any pending data first. */ | |
1046 | rc = session->tt->xmit_pdu(task); | |
1047 | if (rc < 0) | |
1048 | return rc; | |
1049 | ||
1050 | /* mgmt command */ | |
1051 | if (!task->sc) { | |
1052 | if (task->hdr->itt == RESERVED_ITT) | |
1053 | iscsi_put_task(task); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /* Are we done already? */ | |
1058 | if (task->sc->sc_data_direction != DMA_TO_DEVICE) | |
1059 | return 0; | |
1060 | ||
1061 | r2t = iscsi_tcp_get_curr_r2t(task); | |
1062 | if (r2t == NULL) { | |
1063 | /* Waiting for more R2Ts to arrive. */ | |
0ab1c252 | 1064 | ISCSI_DBG_TCP(conn, "no R2Ts yet\n"); |
a081c13e MC |
1065 | return 0; |
1066 | } | |
1067 | ||
2ff79d52 | 1068 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT); |
a081c13e MC |
1069 | if (rc) |
1070 | return rc; | |
1071 | iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr); | |
1072 | ||
0ab1c252 MC |
1073 | ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n", |
1074 | r2t, r2t->datasn - 1, task->hdr->itt, | |
1075 | r2t->data_offset + r2t->sent, r2t->data_count); | |
a081c13e MC |
1076 | |
1077 | rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent, | |
1078 | r2t->data_count); | |
9a6510eb MC |
1079 | if (rc) { |
1080 | iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED); | |
a081c13e | 1081 | return rc; |
9a6510eb MC |
1082 | } |
1083 | ||
a081c13e MC |
1084 | r2t->sent += r2t->data_count; |
1085 | goto flush; | |
1086 | } | |
1087 | EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit); | |
1088 | ||
1089 | struct iscsi_cls_conn * | |
1090 | iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size, | |
1091 | uint32_t conn_idx) | |
1092 | ||
1093 | { | |
1094 | struct iscsi_conn *conn; | |
1095 | struct iscsi_cls_conn *cls_conn; | |
1096 | struct iscsi_tcp_conn *tcp_conn; | |
1097 | ||
74dcd0ec MC |
1098 | cls_conn = iscsi_conn_setup(cls_session, |
1099 | sizeof(*tcp_conn) + dd_data_size, conn_idx); | |
a081c13e MC |
1100 | if (!cls_conn) |
1101 | return NULL; | |
1102 | conn = cls_conn->dd_data; | |
1103 | /* | |
1104 | * due to strange issues with iser these are not set | |
1105 | * in iscsi_conn_setup | |
1106 | */ | |
1107 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; | |
1108 | ||
1109 | tcp_conn = conn->dd_data; | |
1110 | tcp_conn->iscsi_conn = conn; | |
74dcd0ec | 1111 | tcp_conn->dd_data = conn->dd_data + sizeof(*tcp_conn); |
a081c13e MC |
1112 | return cls_conn; |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup); | |
1115 | ||
1116 | void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1117 | { | |
a081c13e MC |
1118 | iscsi_conn_teardown(cls_conn); |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown); | |
1121 | ||
1122 | int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session) | |
1123 | { | |
1124 | int i; | |
1125 | int cmd_i; | |
1126 | ||
1127 | /* | |
1128 | * initialize per-task: R2T pool and xmit queue | |
1129 | */ | |
1130 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1131 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1132 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1133 | ||
1134 | /* | |
1135 | * pre-allocated x2 as much r2ts to handle race when | |
1136 | * target acks DataOut faster than we data_xmit() queues | |
1137 | * could replenish r2tqueue. | |
1138 | */ | |
1139 | ||
1140 | /* R2T pool */ | |
1141 | if (iscsi_pool_init(&tcp_task->r2tpool, | |
1142 | session->max_r2t * 2, NULL, | |
1143 | sizeof(struct iscsi_r2t_info))) { | |
1144 | goto r2t_alloc_fail; | |
1145 | } | |
1146 | ||
1147 | /* R2T xmit queue */ | |
45465487 | 1148 | if (kfifo_alloc(&tcp_task->r2tqueue, |
c1e13f25 | 1149 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) { |
a081c13e MC |
1150 | iscsi_pool_free(&tcp_task->r2tpool); |
1151 | goto r2t_alloc_fail; | |
1152 | } | |
659743b0 SP |
1153 | spin_lock_init(&tcp_task->pool2queue); |
1154 | spin_lock_init(&tcp_task->queue2pool); | |
a081c13e MC |
1155 | } |
1156 | ||
1157 | return 0; | |
1158 | ||
1159 | r2t_alloc_fail: | |
1160 | for (i = 0; i < cmd_i; i++) { | |
1161 | struct iscsi_task *task = session->cmds[i]; | |
1162 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1163 | ||
45465487 | 1164 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1165 | iscsi_pool_free(&tcp_task->r2tpool); |
1166 | } | |
1167 | return -ENOMEM; | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc); | |
1170 | ||
1171 | void iscsi_tcp_r2tpool_free(struct iscsi_session *session) | |
1172 | { | |
1173 | int i; | |
1174 | ||
1175 | for (i = 0; i < session->cmds_max; i++) { | |
1176 | struct iscsi_task *task = session->cmds[i]; | |
1177 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1178 | ||
45465487 | 1179 | kfifo_free(&tcp_task->r2tqueue); |
a081c13e MC |
1180 | iscsi_pool_free(&tcp_task->r2tpool); |
1181 | } | |
1182 | } | |
1183 | EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free); | |
1184 | ||
1304be5f MC |
1185 | int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf) |
1186 | { | |
1187 | struct iscsi_session *session = conn->session; | |
1188 | unsigned short r2ts = 0; | |
1189 | ||
1190 | sscanf(buf, "%hu", &r2ts); | |
1191 | if (session->max_r2t == r2ts) | |
1192 | return 0; | |
1193 | ||
1194 | if (!r2ts || !is_power_of_2(r2ts)) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | session->max_r2t = r2ts; | |
1198 | iscsi_tcp_r2tpool_free(session); | |
1199 | return iscsi_tcp_r2tpool_alloc(session); | |
1200 | } | |
1201 | EXPORT_SYMBOL_GPL(iscsi_tcp_set_max_r2t); | |
1202 | ||
a081c13e MC |
1203 | void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
1204 | struct iscsi_stats *stats) | |
1205 | { | |
1206 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1207 | ||
1208 | stats->txdata_octets = conn->txdata_octets; | |
1209 | stats->rxdata_octets = conn->rxdata_octets; | |
1210 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
1211 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
1212 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
1213 | stats->datain_pdus = conn->datain_pdus_cnt; | |
1214 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
1215 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
1216 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
1217 | } | |
1218 | EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats); |