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7ba24713 AA |
1 | /* |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
6 | * Copyright (C) 2005 - 2006 Mike Christie |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
8 | * maintained by open-iscsi@googlegroups.com |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published | |
12 | * by the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * See the file COPYING included with this distribution for more details. | |
21 | * | |
22 | * Credits: | |
23 | * Christoph Hellwig | |
24 | * FUJITA Tomonori | |
25 | * Arne Redlich | |
26 | * Zhenyu Wang | |
27 | */ | |
28 | ||
29 | #include <linux/types.h> | |
30 | #include <linux/list.h> | |
31 | #include <linux/inet.h> | |
4e7aba73 | 32 | #include <linux/file.h> |
7ba24713 AA |
33 | #include <linux/blkdev.h> |
34 | #include <linux/crypto.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/kfifo.h> | |
37 | #include <linux/scatterlist.h> | |
38 | #include <net/tcp.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 40 | #include <scsi/scsi_device.h> |
7ba24713 AA |
41 | #include <scsi/scsi_host.h> |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_transport_iscsi.h> | |
44 | ||
45 | #include "iscsi_tcp.h" | |
46 | ||
47 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
48 | "Alex Aizman <itn780@yahoo.com>"); | |
49 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
50 | MODULE_LICENSE("GPL"); | |
da32dd68 | 51 | #undef DEBUG_TCP |
7ba24713 AA |
52 | #define DEBUG_ASSERT |
53 | ||
54 | #ifdef DEBUG_TCP | |
5bb0b55a | 55 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
56 | #else |
57 | #define debug_tcp(fmt...) | |
58 | #endif | |
59 | ||
7ba24713 AA |
60 | #ifndef DEBUG_ASSERT |
61 | #ifdef BUG_ON | |
62 | #undef BUG_ON | |
63 | #endif | |
64 | #define BUG_ON(expr) | |
65 | #endif | |
66 | ||
7ba24713 AA |
67 | static unsigned int iscsi_max_lun = 512; |
68 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
69 | ||
da32dd68 OK |
70 | static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, |
71 | struct iscsi_chunk *chunk); | |
72 | ||
7ba24713 AA |
73 | static inline void |
74 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
75 | { | |
da32dd68 OK |
76 | ibuf->sg.page = virt_to_page(vbuf); |
77 | ibuf->sg.offset = offset_in_page(vbuf); | |
78 | ibuf->sg.length = size; | |
7ba24713 | 79 | ibuf->sent = 0; |
7cae5159 | 80 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
81 | } |
82 | ||
83 | static inline void | |
84 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
85 | { | |
da32dd68 OK |
86 | ibuf->sg.page = sg->page; |
87 | ibuf->sg.offset = sg->offset; | |
88 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
89 | /* |
90 | * Fastpath: sg element fits into single page | |
91 | */ | |
da32dd68 | 92 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
93 | ibuf->use_sendmsg = 0; |
94 | else | |
95 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
96 | ibuf->sent = 0; |
97 | } | |
98 | ||
99 | static inline int | |
100 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
101 | { | |
102 | int rc; | |
103 | ||
104 | rc = ibuf->sg.length - ibuf->sent; | |
105 | BUG_ON(rc < 0); | |
106 | return rc; | |
107 | } | |
108 | ||
109 | static inline void | |
af973481 MC |
110 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
111 | u8* crc) | |
7ba24713 | 112 | { |
5bb0b55a | 113 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 114 | |
c9802cd9 | 115 | crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc); |
218432c6 | 116 | buf->sg.length += sizeof(u32); |
7ba24713 AA |
117 | } |
118 | ||
da32dd68 OK |
119 | /* |
120 | * Scatterlist handling: inside the iscsi_chunk, we | |
121 | * remember an index into the scatterlist, and set data/size | |
122 | * to the current scatterlist entry. For highmem pages, we | |
123 | * kmap as needed. | |
124 | * | |
125 | * Note that the page is unmapped when we return from | |
126 | * TCP's data_ready handler, so we may end up mapping and | |
127 | * unmapping the same page repeatedly. The whole reason | |
128 | * for this is that we shouldn't keep the page mapped | |
129 | * outside the softirq. | |
130 | */ | |
131 | ||
132 | /** | |
133 | * iscsi_tcp_chunk_init_sg - init indicated scatterlist entry | |
134 | * @chunk: the buffer object | |
135 | * @idx: index into scatterlist | |
136 | * @offset: byte offset into that sg entry | |
137 | * | |
138 | * This function sets up the chunk so that subsequent | |
139 | * data is copied to the indicated sg entry, at the given | |
140 | * offset. | |
141 | */ | |
142 | static inline void | |
143 | iscsi_tcp_chunk_init_sg(struct iscsi_chunk *chunk, | |
144 | unsigned int idx, unsigned int offset) | |
145 | { | |
146 | struct scatterlist *sg; | |
147 | ||
148 | BUG_ON(chunk->sg == NULL); | |
149 | ||
150 | sg = &chunk->sg[idx]; | |
151 | chunk->sg_index = idx; | |
152 | chunk->sg_offset = offset; | |
153 | chunk->size = min(sg->length - offset, chunk->total_size); | |
154 | chunk->data = NULL; | |
155 | } | |
156 | ||
157 | /** | |
158 | * iscsi_tcp_chunk_map - map the current S/G page | |
159 | * @chunk: iscsi chunk | |
160 | * | |
161 | * We only need to possibly kmap data if scatter lists are being used, | |
162 | * because the iscsi passthrough and internal IO paths will never use high | |
163 | * mem pages. | |
164 | */ | |
165 | static inline void | |
166 | iscsi_tcp_chunk_map(struct iscsi_chunk *chunk) | |
167 | { | |
168 | struct scatterlist *sg; | |
169 | ||
170 | if (chunk->data != NULL || !chunk->sg) | |
171 | return; | |
172 | ||
173 | sg = &chunk->sg[chunk->sg_index]; | |
174 | BUG_ON(chunk->sg_mapped); | |
175 | BUG_ON(sg->length == 0); | |
176 | chunk->sg_mapped = kmap_atomic(sg->page, KM_SOFTIRQ0); | |
177 | chunk->data = chunk->sg_mapped + sg->offset + chunk->sg_offset; | |
178 | } | |
179 | ||
180 | static inline void | |
181 | iscsi_tcp_chunk_unmap(struct iscsi_chunk *chunk) | |
182 | { | |
183 | if (chunk->sg_mapped) { | |
184 | kunmap_atomic(chunk->sg_mapped, KM_SOFTIRQ0); | |
185 | chunk->sg_mapped = NULL; | |
186 | chunk->data = NULL; | |
187 | } | |
188 | } | |
189 | ||
190 | /* | |
191 | * Splice the digest buffer into the buffer | |
192 | */ | |
193 | static inline void | |
194 | iscsi_tcp_chunk_splice_digest(struct iscsi_chunk *chunk, void *digest) | |
195 | { | |
196 | chunk->data = digest; | |
197 | chunk->digest_len = ISCSI_DIGEST_SIZE; | |
198 | chunk->total_size += ISCSI_DIGEST_SIZE; | |
199 | chunk->size = ISCSI_DIGEST_SIZE; | |
200 | chunk->copied = 0; | |
201 | chunk->sg = NULL; | |
202 | chunk->sg_index = 0; | |
203 | chunk->hash = NULL; | |
204 | } | |
205 | ||
206 | /** | |
207 | * iscsi_tcp_chunk_done - check whether the chunk is complete | |
208 | * @chunk: iscsi chunk to check | |
209 | * | |
210 | * Check if we're done receiving this chunk. If the receive | |
211 | * buffer is full but we expect more data, move on to the | |
212 | * next entry in the scatterlist. | |
213 | * | |
214 | * If the amount of data we received isn't a multiple of 4, | |
215 | * we will transparently receive the pad bytes, too. | |
216 | * | |
217 | * This function must be re-entrant. | |
218 | */ | |
7ba24713 | 219 | static inline int |
da32dd68 | 220 | iscsi_tcp_chunk_done(struct iscsi_chunk *chunk) |
7ba24713 | 221 | { |
da32dd68 OK |
222 | static unsigned char padbuf[ISCSI_PAD_LEN]; |
223 | ||
224 | if (chunk->copied < chunk->size) { | |
225 | iscsi_tcp_chunk_map(chunk); | |
226 | return 0; | |
227 | } | |
7ba24713 | 228 | |
da32dd68 OK |
229 | chunk->total_copied += chunk->copied; |
230 | chunk->copied = 0; | |
231 | chunk->size = 0; | |
7ba24713 | 232 | |
da32dd68 OK |
233 | /* Unmap the current scatterlist page, if there is one. */ |
234 | iscsi_tcp_chunk_unmap(chunk); | |
235 | ||
236 | /* Do we have more scatterlist entries? */ | |
237 | if (chunk->total_copied < chunk->total_size) { | |
238 | /* Proceed to the next entry in the scatterlist. */ | |
239 | iscsi_tcp_chunk_init_sg(chunk, chunk->sg_index + 1, 0); | |
240 | iscsi_tcp_chunk_map(chunk); | |
241 | BUG_ON(chunk->size == 0); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* Do we need to handle padding? */ | |
246 | if (chunk->total_copied & (ISCSI_PAD_LEN-1)) { | |
247 | unsigned int pad; | |
248 | ||
249 | pad = ISCSI_PAD_LEN - (chunk->total_copied & (ISCSI_PAD_LEN-1)); | |
250 | debug_tcp("consume %d pad bytes\n", pad); | |
251 | chunk->total_size += pad; | |
252 | chunk->size = pad; | |
253 | chunk->data = padbuf; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Set us up for receiving the data digest. hdr digest | |
259 | * is completely handled in hdr done function. | |
260 | */ | |
261 | if (chunk->hash) { | |
262 | if (chunk->digest_len == 0) { | |
263 | crypto_hash_final(chunk->hash, chunk->digest); | |
264 | iscsi_tcp_chunk_splice_digest(chunk, | |
265 | chunk->recv_digest); | |
266 | return 0; | |
7ba24713 | 267 | } |
da32dd68 | 268 | } |
7ba24713 | 269 | |
da32dd68 OK |
270 | return 1; |
271 | } | |
7ba24713 | 272 | |
da32dd68 OK |
273 | /** |
274 | * iscsi_tcp_chunk_recv - copy data to chunk | |
275 | * @tcp_conn: the iSCSI TCP connection | |
276 | * @chunk: the buffer to copy to | |
277 | * @ptr: data pointer | |
278 | * @len: amount of data available | |
279 | * | |
280 | * This function copies up to @len bytes to the | |
281 | * given buffer, and returns the number of bytes | |
282 | * consumed, which can actually be less than @len. | |
283 | * | |
284 | * If hash digest is enabled, the function will update the | |
285 | * hash while copying. | |
286 | * Combining these two operations doesn't buy us a lot (yet), | |
287 | * but in the future we could implement combined copy+crc, | |
288 | * just way we do for network layer checksums. | |
289 | */ | |
290 | static int | |
291 | iscsi_tcp_chunk_recv(struct iscsi_tcp_conn *tcp_conn, | |
292 | struct iscsi_chunk *chunk, const void *ptr, | |
293 | unsigned int len) | |
294 | { | |
295 | struct scatterlist sg; | |
296 | unsigned int copy, copied = 0; | |
7ba24713 | 297 | |
da32dd68 OK |
298 | while (!iscsi_tcp_chunk_done(chunk)) { |
299 | if (copied == len) | |
300 | goto out; | |
7ba24713 | 301 | |
da32dd68 OK |
302 | copy = min(len - copied, chunk->size - chunk->copied); |
303 | memcpy(chunk->data + chunk->copied, ptr + copied, copy); | |
7ba24713 | 304 | |
da32dd68 OK |
305 | if (chunk->hash) { |
306 | sg_init_one(&sg, ptr + copied, copy); | |
307 | crypto_hash_update(chunk->hash, &sg, copy); | |
308 | } | |
309 | chunk->copied += copy; | |
310 | copied += copy; | |
311 | } | |
312 | ||
313 | out: | |
314 | return copied; | |
315 | } | |
316 | ||
317 | static inline void | |
318 | iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen, | |
319 | unsigned char digest[ISCSI_DIGEST_SIZE]) | |
320 | { | |
321 | struct scatterlist sg; | |
7ba24713 | 322 | |
da32dd68 OK |
323 | sg_init_one(&sg, hdr, hdrlen); |
324 | crypto_hash_digest(hash, &sg, hdrlen, digest); | |
325 | } | |
326 | ||
327 | static inline int | |
328 | iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn, | |
329 | struct iscsi_chunk *chunk) | |
330 | { | |
331 | if (!chunk->digest_len) | |
332 | return 1; | |
333 | ||
334 | if (memcmp(chunk->recv_digest, chunk->digest, chunk->digest_len)) { | |
335 | debug_scsi("digest mismatch\n"); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | return 1; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Helper function to set up chunk buffer | |
344 | */ | |
345 | static inline void | |
346 | __iscsi_chunk_init(struct iscsi_chunk *chunk, size_t size, | |
347 | iscsi_chunk_done_fn_t *done, struct hash_desc *hash) | |
348 | { | |
349 | memset(chunk, 0, sizeof(*chunk)); | |
350 | chunk->total_size = size; | |
351 | chunk->done = done; | |
352 | ||
353 | if (hash) { | |
354 | chunk->hash = hash; | |
355 | crypto_hash_init(hash); | |
356 | } | |
357 | } | |
358 | ||
359 | static inline void | |
360 | iscsi_chunk_init_linear(struct iscsi_chunk *chunk, void *data, size_t size, | |
361 | iscsi_chunk_done_fn_t *done, struct hash_desc *hash) | |
362 | { | |
363 | __iscsi_chunk_init(chunk, size, done, hash); | |
364 | chunk->data = data; | |
365 | chunk->size = size; | |
366 | } | |
367 | ||
368 | static inline int | |
369 | iscsi_chunk_seek_sg(struct iscsi_chunk *chunk, | |
370 | struct scatterlist *sg, unsigned int sg_count, | |
371 | unsigned int offset, size_t size, | |
372 | iscsi_chunk_done_fn_t *done, struct hash_desc *hash) | |
373 | { | |
374 | unsigned int i; | |
375 | ||
376 | __iscsi_chunk_init(chunk, size, done, hash); | |
377 | for (i = 0; i < sg_count; ++i) { | |
378 | if (offset < sg[i].length) { | |
379 | chunk->sg = sg; | |
380 | chunk->sg_count = sg_count; | |
381 | iscsi_tcp_chunk_init_sg(chunk, i, offset); | |
382 | return 0; | |
7ba24713 | 383 | } |
da32dd68 | 384 | offset -= sg[i].length; |
7ba24713 AA |
385 | } |
386 | ||
da32dd68 OK |
387 | return ISCSI_ERR_DATA_OFFSET; |
388 | } | |
389 | ||
390 | /** | |
391 | * iscsi_tcp_hdr_recv_prep - prep chunk for hdr reception | |
392 | * @tcp_conn: iscsi connection to prep for | |
393 | * | |
394 | * This function always passes NULL for the hash argument, because when this | |
395 | * function is called we do not yet know the final size of the header and want | |
396 | * to delay the digest processing until we know that. | |
397 | */ | |
398 | static void | |
399 | iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
400 | { | |
401 | debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn, | |
402 | tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : ""); | |
403 | iscsi_chunk_init_linear(&tcp_conn->in.chunk, | |
404 | tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr), | |
405 | iscsi_tcp_hdr_recv_done, NULL); | |
406 | } | |
407 | ||
408 | /* | |
409 | * Handle incoming reply to any other type of command | |
410 | */ | |
411 | static int | |
412 | iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
413 | struct iscsi_chunk *chunk) | |
414 | { | |
415 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
416 | int rc = 0; | |
417 | ||
418 | if (!iscsi_tcp_dgst_verify(tcp_conn, chunk)) | |
419 | return ISCSI_ERR_DATA_DGST; | |
420 | ||
421 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, | |
422 | conn->data, tcp_conn->in.datalen); | |
423 | if (rc) | |
424 | return rc; | |
425 | ||
426 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
427 | return 0; |
428 | } | |
429 | ||
da32dd68 OK |
430 | static void |
431 | iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) | |
432 | { | |
433 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
434 | struct hash_desc *rx_hash = NULL; | |
435 | ||
436 | if (conn->datadgst_en) | |
437 | rx_hash = &tcp_conn->rx_hash; | |
438 | ||
439 | iscsi_chunk_init_linear(&tcp_conn->in.chunk, | |
440 | conn->data, tcp_conn->in.datalen, | |
441 | iscsi_tcp_data_recv_done, rx_hash); | |
442 | } | |
443 | ||
30a6c652 MC |
444 | /* |
445 | * must be called with session lock | |
446 | */ | |
447 | static void | |
b6c395ed | 448 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 449 | { |
5bb0b55a | 450 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 451 | struct iscsi_r2t_info *r2t; |
30a6c652 | 452 | struct scsi_cmnd *sc; |
7ba24713 | 453 | |
b6c395ed MC |
454 | /* flush ctask's r2t queues */ |
455 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
456 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
457 | sizeof(void*)); | |
458 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
459 | } | |
460 | ||
30a6c652 MC |
461 | sc = ctask->sc; |
462 | if (unlikely(!sc)) | |
7ba24713 | 463 | return; |
30a6c652 | 464 | |
843c0a8a | 465 | tcp_ctask->xmstate = XMSTATE_IDLE; |
5bb0b55a | 466 | tcp_ctask->r2t = NULL; |
7ba24713 AA |
467 | } |
468 | ||
469 | /** | |
470 | * iscsi_data_rsp - SCSI Data-In Response processing | |
471 | * @conn: iscsi connection | |
472 | * @ctask: scsi command task | |
473 | **/ | |
474 | static int | |
475 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
476 | { | |
5bb0b55a MC |
477 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
478 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
479 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 | 480 | struct iscsi_session *session = conn->session; |
857ae0bd | 481 | struct scsi_cmnd *sc = ctask->sc; |
7ba24713 AA |
482 | int datasn = be32_to_cpu(rhdr->datasn); |
483 | ||
77a23c21 | 484 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7ba24713 AA |
485 | /* |
486 | * setup Data-In byte counter (gets decremented..) | |
487 | */ | |
5bb0b55a | 488 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 489 | |
5bb0b55a | 490 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
491 | return 0; |
492 | ||
d473cc7f MC |
493 | if (tcp_ctask->exp_datasn != datasn) { |
494 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
495 | __FUNCTION__, tcp_ctask->exp_datasn, datasn); | |
7ba24713 | 496 | return ISCSI_ERR_DATASN; |
d473cc7f | 497 | } |
7ba24713 | 498 | |
d473cc7f | 499 | tcp_ctask->exp_datasn++; |
7ba24713 | 500 | |
5bb0b55a | 501 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
1c138991 | 502 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > scsi_bufflen(sc)) { |
857ae0bd MC |
503 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", |
504 | __FUNCTION__, tcp_ctask->data_offset, | |
1c138991 | 505 | tcp_conn->in.datalen, scsi_bufflen(sc)); |
7ba24713 | 506 | return ISCSI_ERR_DATA_OFFSET; |
857ae0bd | 507 | } |
7ba24713 AA |
508 | |
509 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
7207fea4 | 510 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
7ba24713 | 511 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
7207fea4 BH |
512 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | |
513 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
7ba24713 AA |
514 | int res_count = be32_to_cpu(rhdr->residual_count); |
515 | ||
516 | if (res_count > 0 && | |
7207fea4 BH |
517 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || |
518 | res_count <= scsi_bufflen(sc))) | |
1c138991 | 519 | scsi_set_resid(sc, res_count); |
7207fea4 | 520 | else |
7ba24713 AA |
521 | sc->result = (DID_BAD_TARGET << 16) | |
522 | rhdr->cmd_status; | |
7207fea4 | 523 | } |
7ba24713 AA |
524 | } |
525 | ||
526 | conn->datain_pdus_cnt++; | |
527 | return 0; | |
528 | } | |
529 | ||
530 | /** | |
531 | * iscsi_solicit_data_init - initialize first Data-Out | |
532 | * @conn: iscsi connection | |
533 | * @ctask: scsi command task | |
534 | * @r2t: R2T info | |
535 | * | |
536 | * Notes: | |
537 | * Initialize first Data-Out within this R2T sequence and finds | |
538 | * proper data_offset within this SCSI command. | |
539 | * | |
540 | * This function is called with connection lock taken. | |
541 | **/ | |
542 | static void | |
543 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
544 | struct iscsi_r2t_info *r2t) | |
545 | { | |
546 | struct iscsi_data *hdr; | |
7ba24713 | 547 | struct scsi_cmnd *sc = ctask->sc; |
1c138991 FT |
548 | int i, sg_count = 0; |
549 | struct scatterlist *sg; | |
7ba24713 | 550 | |
ffbfe925 | 551 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
552 | memset(hdr, 0, sizeof(struct iscsi_data)); |
553 | hdr->ttt = r2t->ttt; | |
554 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
555 | r2t->solicit_datasn++; | |
556 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
557 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
558 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
559 | hdr->exp_statsn = r2t->exp_statsn; |
560 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
561 | if (r2t->data_length > conn->max_xmit_dlength) { | |
562 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
563 | r2t->data_count = conn->max_xmit_dlength; | |
564 | hdr->flags = 0; | |
565 | } else { | |
566 | hton24(hdr->dlength, r2t->data_length); | |
567 | r2t->data_count = r2t->data_length; | |
568 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
569 | } | |
570 | conn->dataout_pdus_cnt++; | |
571 | ||
572 | r2t->sent = 0; | |
573 | ||
6e458cc9 | 574 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 575 | sizeof(struct iscsi_hdr)); |
7ba24713 | 576 | |
1c138991 FT |
577 | sg = scsi_sglist(sc); |
578 | r2t->sg = NULL; | |
579 | for (i = 0; i < scsi_sg_count(sc); i++, sg += 1) { | |
580 | /* FIXME: prefetch ? */ | |
581 | if (sg_count + sg->length > r2t->data_offset) { | |
582 | int page_offset; | |
7ba24713 | 583 | |
1c138991 | 584 | /* sg page found! */ |
7ba24713 | 585 | |
1c138991 FT |
586 | /* offset within this page */ |
587 | page_offset = r2t->data_offset - sg_count; | |
7ba24713 | 588 | |
1c138991 FT |
589 | /* fill in this buffer */ |
590 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
591 | r2t->sendbuf.sg.offset += page_offset; | |
592 | r2t->sendbuf.sg.length -= page_offset; | |
7ba24713 | 593 | |
1c138991 FT |
594 | /* xmit logic will continue with next one */ |
595 | r2t->sg = sg + 1; | |
596 | break; | |
7ba24713 | 597 | } |
1c138991 | 598 | sg_count += sg->length; |
62f38300 | 599 | } |
1c138991 | 600 | BUG_ON(r2t->sg == NULL); |
7ba24713 AA |
601 | } |
602 | ||
603 | /** | |
604 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
605 | * @conn: iscsi connection | |
606 | * @ctask: scsi command task | |
607 | **/ | |
608 | static int | |
609 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
610 | { | |
611 | struct iscsi_r2t_info *r2t; | |
612 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
613 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
614 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
615 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
616 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
617 | int rc; | |
618 | ||
98a9416a MC |
619 | if (tcp_conn->in.datalen) { |
620 | printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n", | |
621 | tcp_conn->in.datalen); | |
7ba24713 | 622 | return ISCSI_ERR_DATALEN; |
98a9416a | 623 | } |
7ba24713 | 624 | |
d473cc7f MC |
625 | if (tcp_ctask->exp_datasn != r2tsn){ |
626 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
627 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
7ba24713 | 628 | return ISCSI_ERR_R2TSN; |
d473cc7f | 629 | } |
7ba24713 | 630 | |
7ba24713 AA |
631 | /* fill-in new R2T associated with the task */ |
632 | spin_lock(&session->lock); | |
77a23c21 MC |
633 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
634 | ||
843c0a8a | 635 | if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) { |
7ba24713 AA |
636 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " |
637 | "recovery...\n", ctask->itt); | |
638 | spin_unlock(&session->lock); | |
639 | return 0; | |
640 | } | |
b6c395ed | 641 | |
5bb0b55a | 642 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
643 | BUG_ON(!rc); |
644 | ||
645 | r2t->exp_statsn = rhdr->statsn; | |
646 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a MC |
647 | if (r2t->data_length == 0) { |
648 | printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n"); | |
7ba24713 AA |
649 | spin_unlock(&session->lock); |
650 | return ISCSI_ERR_DATALEN; | |
651 | } | |
652 | ||
98a9416a MC |
653 | if (r2t->data_length > session->max_burst) |
654 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
655 | "Attempting to execute request.\n", | |
656 | r2t->data_length, session->max_burst); | |
657 | ||
7ba24713 | 658 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
1c138991 | 659 | if (r2t->data_offset + r2t->data_length > scsi_bufflen(ctask->sc)) { |
7ba24713 | 660 | spin_unlock(&session->lock); |
98a9416a MC |
661 | printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at " |
662 | "offset %u and total length %d\n", r2t->data_length, | |
1c138991 | 663 | r2t->data_offset, scsi_bufflen(ctask->sc)); |
7ba24713 AA |
664 | return ISCSI_ERR_DATALEN; |
665 | } | |
666 | ||
667 | r2t->ttt = rhdr->ttt; /* no flip */ | |
668 | r2t->solicit_datasn = 0; | |
669 | ||
670 | iscsi_solicit_data_init(conn, ctask, r2t); | |
671 | ||
d473cc7f | 672 | tcp_ctask->exp_datasn = r2tsn + 1; |
5bb0b55a | 673 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
843c0a8a | 674 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT; |
7ba24713 | 675 | conn->r2t_pdus_cnt++; |
843c0a8a MC |
676 | |
677 | iscsi_requeue_ctask(ctask); | |
7ba24713 AA |
678 | spin_unlock(&session->lock); |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
da32dd68 OK |
683 | /* |
684 | * Handle incoming reply to DataIn command | |
685 | */ | |
686 | static int | |
687 | iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn, | |
688 | struct iscsi_chunk *chunk) | |
689 | { | |
690 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; | |
691 | struct iscsi_hdr *hdr = tcp_conn->in.hdr; | |
692 | int rc; | |
693 | ||
694 | if (!iscsi_tcp_dgst_verify(tcp_conn, chunk)) | |
695 | return ISCSI_ERR_DATA_DGST; | |
696 | ||
697 | /* check for non-exceptional status */ | |
698 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
699 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
700 | if (rc) | |
701 | return rc; | |
702 | } | |
703 | ||
704 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | /** | |
709 | * iscsi_tcp_hdr_dissect - process PDU header | |
710 | * @conn: iSCSI connection | |
711 | * @hdr: PDU header | |
712 | * | |
713 | * This function analyzes the header of the PDU received, | |
714 | * and performs several sanity checks. If the PDU is accompanied | |
715 | * by data, the receive buffer is set up to copy the incoming data | |
716 | * to the correct location. | |
717 | */ | |
7ba24713 | 718 | static int |
da32dd68 | 719 | iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
7ba24713 | 720 | { |
5bb0b55a | 721 | int rc = 0, opcode, ahslen; |
7ba24713 | 722 | struct iscsi_session *session = conn->session; |
5bb0b55a | 723 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
da32dd68 OK |
724 | struct iscsi_cmd_task *ctask; |
725 | uint32_t itt; | |
7ba24713 AA |
726 | |
727 | /* verify PDU length */ | |
5bb0b55a MC |
728 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
729 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 730 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 731 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
732 | return ISCSI_ERR_DATALEN; |
733 | } | |
7ba24713 | 734 | |
da32dd68 OK |
735 | /* Additional header segments. So far, we don't |
736 | * process additional headers. | |
737 | */ | |
5bb0b55a | 738 | ahslen = hdr->hlength << 2; |
7ba24713 | 739 | |
5bb0b55a | 740 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 741 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
742 | rc = iscsi_verify_itt(conn, hdr, &itt); |
743 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
da32dd68 | 744 | /* XXX: what does this do? */ |
5bb0b55a MC |
745 | tcp_conn->in.datalen = 0; /* force drop */ |
746 | return 0; | |
747 | } else if (rc) | |
748 | return rc; | |
7ba24713 | 749 | |
da32dd68 OK |
750 | debug_tcp("opcode 0x%x ahslen %d datalen %d\n", |
751 | opcode, ahslen, tcp_conn->in.datalen); | |
7ba24713 | 752 | |
5bb0b55a MC |
753 | switch(opcode) { |
754 | case ISCSI_OP_SCSI_DATA_IN: | |
da32dd68 OK |
755 | ctask = session->cmds[itt]; |
756 | rc = iscsi_data_rsp(conn, ctask); | |
275fd7d1 MC |
757 | if (rc) |
758 | return rc; | |
da32dd68 OK |
759 | if (tcp_conn->in.datalen) { |
760 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
761 | struct hash_desc *rx_hash = NULL; | |
762 | ||
763 | /* | |
764 | * Setup copy of Data-In into the Scsi_Cmnd | |
765 | * Scatterlist case: | |
766 | * We set up the iscsi_chunk to point to the next | |
767 | * scatterlist entry to copy to. As we go along, | |
768 | * we move on to the next scatterlist entry and | |
769 | * update the digest per-entry. | |
770 | */ | |
771 | if (conn->datadgst_en) | |
772 | rx_hash = &tcp_conn->rx_hash; | |
773 | ||
774 | debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, " | |
775 | "datalen=%d)\n", tcp_conn, | |
776 | tcp_ctask->data_offset, | |
777 | tcp_conn->in.datalen); | |
778 | return iscsi_chunk_seek_sg(&tcp_conn->in.chunk, | |
779 | scsi_sglist(ctask->sc), | |
780 | scsi_sg_count(ctask->sc), | |
781 | tcp_ctask->data_offset, | |
782 | tcp_conn->in.datalen, | |
783 | iscsi_tcp_process_data_in, | |
784 | rx_hash); | |
785 | } | |
5bb0b55a MC |
786 | /* fall through */ |
787 | case ISCSI_OP_SCSI_CMD_RSP: | |
da32dd68 OK |
788 | if (tcp_conn->in.datalen) { |
789 | iscsi_tcp_data_recv_prep(tcp_conn); | |
790 | return 0; | |
791 | } | |
792 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
5bb0b55a MC |
793 | break; |
794 | case ISCSI_OP_R2T: | |
da32dd68 | 795 | ctask = session->cmds[itt]; |
5bb0b55a MC |
796 | if (ahslen) |
797 | rc = ISCSI_ERR_AHSLEN; | |
da32dd68 OK |
798 | else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) |
799 | rc = iscsi_r2t_rsp(conn, ctask); | |
5bb0b55a MC |
800 | else |
801 | rc = ISCSI_ERR_PROTO; | |
802 | break; | |
803 | case ISCSI_OP_LOGIN_RSP: | |
804 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
805 | case ISCSI_OP_REJECT: |
806 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
807 | /* |
808 | * It is possible that we could get a PDU with a buffer larger | |
809 | * than 8K, but there are no targets that currently do this. | |
810 | * For now we fail until we find a vendor that needs it | |
811 | */ | |
da32dd68 | 812 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) { |
c8dc1e52 MC |
813 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " |
814 | "but conn buffer is only %u (opcode %0x)\n", | |
815 | tcp_conn->in.datalen, | |
bf32ed33 | 816 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); |
c8dc1e52 MC |
817 | rc = ISCSI_ERR_PROTO; |
818 | break; | |
819 | } | |
820 | ||
da32dd68 OK |
821 | /* If there's data coming in with the response, |
822 | * receive it to the connection's buffer. | |
823 | */ | |
824 | if (tcp_conn->in.datalen) { | |
825 | iscsi_tcp_data_recv_prep(tcp_conn); | |
826 | return 0; | |
827 | } | |
5bb0b55a | 828 | /* fall through */ |
c8dc1e52 MC |
829 | case ISCSI_OP_LOGOUT_RSP: |
830 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
831 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
832 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
833 | break; | |
834 | default: | |
835 | rc = ISCSI_ERR_BAD_OPCODE; | |
836 | break; | |
837 | } | |
7ba24713 | 838 | |
da32dd68 OK |
839 | if (rc == 0) { |
840 | /* Anything that comes with data should have | |
841 | * been handled above. */ | |
842 | if (tcp_conn->in.datalen) | |
843 | return ISCSI_ERR_PROTO; | |
844 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
7ba24713 AA |
845 | } |
846 | ||
da32dd68 | 847 | return rc; |
7ba24713 AA |
848 | } |
849 | ||
850 | static inline void | |
c9802cd9 | 851 | partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg, |
62f38300 | 852 | int offset, int length) |
7ba24713 AA |
853 | { |
854 | struct scatterlist temp; | |
855 | ||
68e3f5dd HX |
856 | sg_init_table(&temp, 1); |
857 | sg_set_page(&temp, sg_page(sg), length, offset); | |
c9802cd9 | 858 | crypto_hash_update(desc, &temp, length); |
7ba24713 AA |
859 | } |
860 | ||
da32dd68 OK |
861 | /** |
862 | * iscsi_tcp_hdr_recv_done - process PDU header | |
863 | * | |
864 | * This is the callback invoked when the PDU header has | |
865 | * been received. If the header is followed by additional | |
866 | * header segments, we go back for more data. | |
867 | */ | |
868 | static int | |
869 | iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn, | |
870 | struct iscsi_chunk *chunk) | |
7ba24713 | 871 | { |
da32dd68 OK |
872 | struct iscsi_conn *conn = tcp_conn->iscsi_conn; |
873 | struct iscsi_hdr *hdr; | |
7ba24713 | 874 | |
da32dd68 OK |
875 | /* Check if there are additional header segments |
876 | * *prior* to computing the digest, because we | |
877 | * may need to go back to the caller for more. | |
878 | */ | |
879 | hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf; | |
880 | if (chunk->copied == sizeof(struct iscsi_hdr) && hdr->hlength) { | |
881 | /* Bump the header length - the caller will | |
882 | * just loop around and get the AHS for us, and | |
883 | * call again. */ | |
884 | unsigned int ahslen = hdr->hlength << 2; | |
885 | ||
886 | /* Make sure we don't overflow */ | |
887 | if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf)) | |
888 | return ISCSI_ERR_AHSLEN; | |
889 | ||
890 | chunk->total_size += ahslen; | |
891 | chunk->size += ahslen; | |
892 | return 0; | |
7ba24713 AA |
893 | } |
894 | ||
da32dd68 OK |
895 | /* We're done processing the header. See if we're doing |
896 | * header digests; if so, set up the recv_digest buffer | |
897 | * and go back for more. */ | |
898 | if (conn->hdrdgst_en) { | |
899 | if (chunk->digest_len == 0) { | |
900 | iscsi_tcp_chunk_splice_digest(chunk, | |
901 | chunk->recv_digest); | |
902 | return 0; | |
7ba24713 | 903 | } |
da32dd68 OK |
904 | iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr, |
905 | chunk->total_copied - ISCSI_DIGEST_SIZE, | |
906 | chunk->digest); | |
7ba24713 | 907 | |
da32dd68 OK |
908 | if (!iscsi_tcp_dgst_verify(tcp_conn, chunk)) |
909 | return ISCSI_ERR_HDR_DGST; | |
7ba24713 | 910 | } |
da32dd68 OK |
911 | |
912 | tcp_conn->in.hdr = hdr; | |
913 | return iscsi_tcp_hdr_dissect(conn, hdr); | |
7ba24713 AA |
914 | } |
915 | ||
916 | /** | |
da32dd68 | 917 | * iscsi_tcp_recv - TCP receive in sendfile fashion |
7ba24713 AA |
918 | * @rd_desc: read descriptor |
919 | * @skb: socket buffer | |
920 | * @offset: offset in skb | |
921 | * @len: skb->len - offset | |
922 | **/ | |
923 | static int | |
da32dd68 OK |
924 | iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
925 | unsigned int offset, size_t len) | |
7ba24713 | 926 | { |
7ba24713 | 927 | struct iscsi_conn *conn = rd_desc->arg.data; |
5bb0b55a | 928 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
da32dd68 OK |
929 | struct iscsi_chunk *chunk = &tcp_conn->in.chunk; |
930 | struct skb_seq_state seq; | |
931 | unsigned int consumed = 0; | |
932 | int rc = 0; | |
7ba24713 | 933 | |
da32dd68 | 934 | debug_tcp("in %d bytes\n", skb->len - offset); |
7ba24713 AA |
935 | |
936 | if (unlikely(conn->suspend_rx)) { | |
937 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
938 | return 0; | |
939 | } | |
940 | ||
da32dd68 OK |
941 | skb_prepare_seq_read(skb, offset, skb->len, &seq); |
942 | while (1) { | |
943 | unsigned int avail; | |
944 | const u8 *ptr; | |
7ba24713 | 945 | |
da32dd68 OK |
946 | avail = skb_seq_read(consumed, &ptr, &seq); |
947 | if (avail == 0) | |
948 | break; | |
949 | BUG_ON(chunk->copied >= chunk->size); | |
950 | ||
951 | debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail); | |
952 | rc = iscsi_tcp_chunk_recv(tcp_conn, chunk, ptr, avail); | |
953 | BUG_ON(rc == 0); | |
954 | consumed += rc; | |
955 | ||
956 | if (chunk->total_copied >= chunk->total_size) { | |
957 | rc = chunk->done(tcp_conn, chunk); | |
958 | if (rc != 0) { | |
959 | skb_abort_seq_read(&seq); | |
960 | goto error; | |
dbdb016d | 961 | } |
7ba24713 | 962 | |
da32dd68 OK |
963 | /* The done() functions sets up the |
964 | * next chunk. */ | |
7ba24713 | 965 | } |
7ba24713 AA |
966 | } |
967 | ||
da32dd68 OK |
968 | conn->rxdata_octets += consumed; |
969 | return consumed; | |
7ba24713 | 970 | |
da32dd68 OK |
971 | error: |
972 | debug_tcp("Error receiving PDU, errno=%d\n", rc); | |
973 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
974 | return 0; | |
7ba24713 AA |
975 | } |
976 | ||
977 | static void | |
978 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
979 | { | |
980 | struct iscsi_conn *conn = sk->sk_user_data; | |
da32dd68 | 981 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
982 | read_descriptor_t rd_desc; |
983 | ||
984 | read_lock(&sk->sk_callback_lock); | |
985 | ||
665b44ae | 986 | /* |
da32dd68 | 987 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 988 | * We set count to 1 because we want the network layer to |
da32dd68 | 989 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
990 | * handled pdus that cross buffers or pdus that still need data. |
991 | */ | |
7ba24713 | 992 | rd_desc.arg.data = conn; |
665b44ae | 993 | rd_desc.count = 1; |
da32dd68 | 994 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv); |
7ba24713 AA |
995 | |
996 | read_unlock(&sk->sk_callback_lock); | |
da32dd68 OK |
997 | |
998 | /* If we had to (atomically) map a highmem page, | |
999 | * unmap it now. */ | |
1000 | iscsi_tcp_chunk_unmap(&tcp_conn->in.chunk); | |
7ba24713 AA |
1001 | } |
1002 | ||
1003 | static void | |
1004 | iscsi_tcp_state_change(struct sock *sk) | |
1005 | { | |
5bb0b55a | 1006 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1007 | struct iscsi_conn *conn; |
1008 | struct iscsi_session *session; | |
1009 | void (*old_state_change)(struct sock *); | |
1010 | ||
1011 | read_lock(&sk->sk_callback_lock); | |
1012 | ||
1013 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1014 | session = conn->session; | |
1015 | ||
e6273993 MC |
1016 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1017 | sk->sk_state == TCP_CLOSE) && | |
1018 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1019 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1020 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1021 | } | |
1022 | ||
5bb0b55a MC |
1023 | tcp_conn = conn->dd_data; |
1024 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1025 | |
1026 | read_unlock(&sk->sk_callback_lock); | |
1027 | ||
1028 | old_state_change(sk); | |
1029 | } | |
1030 | ||
1031 | /** | |
1032 | * iscsi_write_space - Called when more output buffer space is available | |
1033 | * @sk: socket space is available for | |
1034 | **/ | |
1035 | static void | |
1036 | iscsi_write_space(struct sock *sk) | |
1037 | { | |
1038 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1039 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1040 | ||
1041 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1042 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1043 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1044 | } |
1045 | ||
1046 | static void | |
1047 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1048 | { | |
5bb0b55a MC |
1049 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1050 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1051 | |
1052 | /* assign new callbacks */ | |
1053 | write_lock_bh(&sk->sk_callback_lock); | |
1054 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1055 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1056 | tcp_conn->old_state_change = sk->sk_state_change; | |
1057 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1058 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1059 | sk->sk_state_change = iscsi_tcp_state_change; | |
1060 | sk->sk_write_space = iscsi_write_space; | |
1061 | write_unlock_bh(&sk->sk_callback_lock); | |
1062 | } | |
1063 | ||
1064 | static void | |
1c83469d | 1065 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1066 | { |
5bb0b55a | 1067 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1068 | |
1069 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1070 | write_lock_bh(&sk->sk_callback_lock); | |
1071 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1072 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1073 | sk->sk_state_change = tcp_conn->old_state_change; | |
1074 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1075 | sk->sk_no_check = 0; |
1076 | write_unlock_bh(&sk->sk_callback_lock); | |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * iscsi_send - generic send routine | |
1081 | * @sk: kernel's socket | |
1082 | * @buf: buffer to write from | |
1083 | * @size: actual size to write | |
1084 | * @flags: socket's flags | |
7ba24713 AA |
1085 | */ |
1086 | static inline int | |
56851698 | 1087 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1088 | { |
5bb0b55a MC |
1089 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1090 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1091 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1092 | |
7cae5159 MC |
1093 | /* |
1094 | * if we got use_sg=0 or are sending something we kmallocd | |
1095 | * then we did not have to do kmap (kmap returns page_address) | |
1096 | * | |
1097 | * if we got use_sg > 0, but had to drop down, we do not | |
1098 | * set clustering so this should only happen for that | |
1099 | * slab case. | |
1100 | */ | |
1101 | if (buf->use_sendmsg) | |
da32dd68 | 1102 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1103 | else |
da32dd68 | 1104 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
3219e529 MC |
1105 | |
1106 | if (res >= 0) { | |
1107 | conn->txdata_octets += res; | |
1108 | buf->sent += res; | |
1109 | return res; | |
1110 | } | |
1111 | ||
1112 | tcp_conn->sendpage_failures_cnt++; | |
1113 | if (res == -EAGAIN) | |
1114 | res = -ENOBUFS; | |
1115 | else | |
1116 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1117 | return res; | |
7ba24713 AA |
1118 | } |
1119 | ||
1120 | /** | |
1121 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1122 | * @conn: iscsi connection | |
1123 | * @buf: buffer to write from | |
1124 | * @datalen: lenght of data to be sent after the header | |
1125 | * | |
1126 | * Notes: | |
1127 | * (Tx, Fast Path) | |
1128 | **/ | |
1129 | static inline int | |
1130 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1131 | { | |
7ba24713 AA |
1132 | int flags = 0; /* MSG_DONTWAIT; */ |
1133 | int res, size; | |
1134 | ||
1135 | size = buf->sg.length - buf->sent; | |
1136 | BUG_ON(buf->sent + size > buf->sg.length); | |
1137 | if (buf->sent + size != buf->sg.length || datalen) | |
1138 | flags |= MSG_MORE; | |
1139 | ||
56851698 | 1140 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1141 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1142 | if (res >= 0) { | |
7ba24713 AA |
1143 | if (size != res) |
1144 | return -EAGAIN; | |
1145 | return 0; | |
3219e529 | 1146 | } |
7ba24713 AA |
1147 | |
1148 | return res; | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1153 | * @conn: iscsi connection | |
1154 | * @buf: buffer to write from | |
1155 | * @count: remaining data | |
1156 | * @sent: number of bytes sent | |
1157 | * | |
1158 | * Notes: | |
1159 | * (Tx, Fast Path) | |
1160 | **/ | |
1161 | static inline int | |
1162 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1163 | int *count, int *sent) | |
1164 | { | |
7ba24713 AA |
1165 | int flags = 0; /* MSG_DONTWAIT; */ |
1166 | int res, size; | |
1167 | ||
1168 | size = buf->sg.length - buf->sent; | |
1169 | BUG_ON(buf->sent + size > buf->sg.length); | |
1170 | if (size > *count) | |
1171 | size = *count; | |
b13941f6 | 1172 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1173 | flags |= MSG_MORE; |
1174 | ||
56851698 | 1175 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1176 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1177 | size, buf->sent, *count, *sent, res); | |
1178 | if (res >= 0) { | |
7ba24713 AA |
1179 | *count -= res; |
1180 | *sent += res; | |
1181 | if (size != res) | |
1182 | return -EAGAIN; | |
1183 | return 0; | |
3219e529 | 1184 | } |
7ba24713 AA |
1185 | |
1186 | return res; | |
1187 | } | |
1188 | ||
1189 | static inline void | |
5bb0b55a | 1190 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
62f38300 | 1191 | struct iscsi_tcp_cmd_task *tcp_ctask) |
7ba24713 | 1192 | { |
c9802cd9 | 1193 | crypto_hash_init(&tcp_conn->tx_hash); |
5bb0b55a | 1194 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1195 | } |
1196 | ||
7ba24713 AA |
1197 | /** |
1198 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1199 | * @conn: iscsi connection | |
1200 | * @ctask: scsi command task | |
1201 | * @r2t: R2T info | |
1202 | * @left: bytes left to transfer | |
1203 | * | |
1204 | * Notes: | |
1205 | * Initialize next Data-Out within this R2T sequence and continue | |
1206 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1207 | * | |
1208 | * Called under connection lock. | |
1209 | **/ | |
1210 | static void | |
1211 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1212 | struct iscsi_r2t_info *r2t, int left) | |
1213 | { | |
1214 | struct iscsi_data *hdr; | |
7ba24713 AA |
1215 | int new_offset; |
1216 | ||
ffbfe925 | 1217 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1218 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1219 | hdr->ttt = r2t->ttt; | |
1220 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1221 | r2t->solicit_datasn++; | |
1222 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1223 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1224 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1225 | hdr->exp_statsn = r2t->exp_statsn; |
1226 | new_offset = r2t->data_offset + r2t->sent; | |
1227 | hdr->offset = cpu_to_be32(new_offset); | |
1228 | if (left > conn->max_xmit_dlength) { | |
1229 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1230 | r2t->data_count = conn->max_xmit_dlength; | |
1231 | } else { | |
1232 | hton24(hdr->dlength, left); | |
1233 | r2t->data_count = left; | |
1234 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1235 | } | |
1236 | conn->dataout_pdus_cnt++; | |
1237 | ||
6e458cc9 | 1238 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1239 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1240 | |
62f38300 MC |
1241 | if (iscsi_buf_left(&r2t->sendbuf)) |
1242 | return; | |
1243 | ||
1c138991 FT |
1244 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1245 | r2t->sg += 1; | |
7ba24713 AA |
1246 | } |
1247 | ||
62f38300 MC |
1248 | static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
1249 | unsigned long len) | |
7ba24713 | 1250 | { |
62f38300 MC |
1251 | tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
1252 | if (!tcp_ctask->pad_count) | |
1253 | return; | |
7ba24713 | 1254 | |
62f38300 MC |
1255 | tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
1256 | debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); | |
843c0a8a | 1257 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
7ba24713 AA |
1258 | } |
1259 | ||
1260 | /** | |
5bb0b55a | 1261 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1262 | * @conn: iscsi connection |
1263 | * @ctask: scsi command task | |
1264 | * @sc: scsi command | |
1265 | **/ | |
1266 | static void | |
5bb0b55a | 1267 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1268 | { |
5bb0b55a | 1269 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1270 | |
5bb0b55a | 1271 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
843c0a8a | 1272 | tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT; |
7ba24713 AA |
1273 | } |
1274 | ||
1275 | /** | |
5bb0b55a | 1276 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1277 | * @conn: iscsi connection |
1278 | * @mtask: task management task | |
1279 | * | |
1280 | * Notes: | |
1281 | * The function can return -EAGAIN in which case caller must | |
1282 | * call it again later, or recover. '0' return code means successful | |
1283 | * xmit. | |
1284 | * | |
218432c6 | 1285 | * Management xmit state machine consists of these states: |
843c0a8a MC |
1286 | * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header |
1287 | * XMSTATE_IMM_HDR - PDU Header xmit in progress | |
1288 | * XMSTATE_IMM_DATA - PDU Data xmit in progress | |
1289 | * XMSTATE_IDLE - management PDU is done | |
7ba24713 AA |
1290 | **/ |
1291 | static int | |
5bb0b55a | 1292 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1293 | { |
5bb0b55a | 1294 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1295 | int rc; |
7ba24713 AA |
1296 | |
1297 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1298 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1299 | |
843c0a8a | 1300 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) { |
218432c6 MC |
1301 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
1302 | sizeof(struct iscsi_hdr)); | |
1303 | ||
1304 | if (mtask->data_count) { | |
843c0a8a | 1305 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 MC |
1306 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, |
1307 | (char*)mtask->data, | |
1308 | mtask->data_count); | |
1309 | } | |
1310 | ||
af973481 | 1311 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1312 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1313 | conn->hdrdgst_en) |
5bb0b55a MC |
1314 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1315 | (u8*)tcp_mtask->hdrext); | |
218432c6 MC |
1316 | |
1317 | tcp_mtask->sent = 0; | |
843c0a8a MC |
1318 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT; |
1319 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
218432c6 MC |
1320 | } |
1321 | ||
843c0a8a | 1322 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
3219e529 MC |
1323 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1324 | mtask->data_count); | |
218432c6 | 1325 | if (rc) |
3219e529 | 1326 | return rc; |
843c0a8a | 1327 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
7ba24713 AA |
1328 | } |
1329 | ||
843c0a8a | 1330 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1331 | BUG_ON(!mtask->data_count); |
843c0a8a | 1332 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1333 | /* FIXME: implement. |
1334 | * Virtual buffer could be spreaded across multiple pages... | |
1335 | */ | |
1336 | do { | |
3219e529 MC |
1337 | int rc; |
1338 | ||
1339 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1340 | &mtask->data_count, &tcp_mtask->sent); | |
1341 | if (rc) { | |
843c0a8a | 1342 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1343 | return rc; |
7ba24713 AA |
1344 | } |
1345 | } while (mtask->data_count); | |
1346 | } | |
1347 | ||
843c0a8a | 1348 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
b4377356 | 1349 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1350 | struct iscsi_session *session = conn->session; |
1351 | ||
1352 | spin_lock_bh(&session->lock); | |
1353 | list_del(&conn->mtask->running); | |
1354 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1355 | sizeof(void*)); | |
1356 | spin_unlock_bh(&session->lock); | |
1357 | } | |
7ba24713 AA |
1358 | return 0; |
1359 | } | |
1360 | ||
218432c6 MC |
1361 | static int |
1362 | iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1363 | { |
218432c6 MC |
1364 | struct scsi_cmnd *sc = ctask->sc; |
1365 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1366 | int rc = 0; | |
3219e529 | 1367 | |
843c0a8a | 1368 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) { |
218432c6 MC |
1369 | tcp_ctask->sent = 0; |
1370 | tcp_ctask->sg_count = 0; | |
1371 | tcp_ctask->exp_datasn = 0; | |
1372 | ||
1373 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1c138991 FT |
1374 | struct scatterlist *sg = scsi_sglist(sc); |
1375 | ||
1376 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); | |
1377 | tcp_ctask->sg = sg + 1; | |
1378 | tcp_ctask->bad_sg = sg + scsi_sg_count(sc); | |
7ba24713 | 1379 | |
218432c6 MC |
1380 | debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
1381 | "unsol count %d, unsol offset %d]\n", | |
1c138991 | 1382 | ctask->itt, scsi_bufflen(sc), |
218432c6 MC |
1383 | ctask->imm_count, ctask->unsol_count, |
1384 | ctask->unsol_offset); | |
1385 | } | |
5bb0b55a | 1386 | |
218432c6 MC |
1387 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
1388 | sizeof(struct iscsi_hdr)); | |
1389 | ||
1390 | if (conn->hdrdgst_en) | |
1391 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, | |
1392 | (u8*)tcp_ctask->hdrext); | |
843c0a8a MC |
1393 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT; |
1394 | tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT; | |
62f38300 MC |
1395 | } |
1396 | ||
843c0a8a | 1397 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) { |
218432c6 MC |
1398 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1399 | if (rc) | |
1400 | return rc; | |
843c0a8a | 1401 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT; |
218432c6 MC |
1402 | |
1403 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1404 | return 0; | |
1405 | ||
1406 | if (ctask->imm_count) { | |
843c0a8a | 1407 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 | 1408 | iscsi_set_padding(tcp_ctask, ctask->imm_count); |
62f38300 | 1409 | |
218432c6 MC |
1410 | if (ctask->conn->datadgst_en) { |
1411 | iscsi_data_digest_init(ctask->conn->dd_data, | |
1412 | tcp_ctask); | |
1413 | tcp_ctask->immdigest = 0; | |
1414 | } | |
62f38300 | 1415 | } |
62f38300 | 1416 | |
843c0a8a MC |
1417 | if (ctask->unsol_count) |
1418 | tcp_ctask->xmstate |= | |
1419 | XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
218432c6 MC |
1420 | } |
1421 | return rc; | |
7ba24713 AA |
1422 | } |
1423 | ||
62f38300 MC |
1424 | static int |
1425 | iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1426 | { |
5bb0b55a | 1427 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1428 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1429 | int sent = 0, rc; | |
5bb0b55a | 1430 | |
843c0a8a | 1431 | if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
62f38300 MC |
1432 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
1433 | tcp_ctask->pad_count); | |
1434 | if (conn->datadgst_en) | |
c9802cd9 JB |
1435 | crypto_hash_update(&tcp_conn->tx_hash, |
1436 | &tcp_ctask->sendbuf.sg, | |
1437 | tcp_ctask->sendbuf.sg.length); | |
843c0a8a | 1438 | } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
62f38300 MC |
1439 | return 0; |
1440 | ||
843c0a8a MC |
1441 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
1442 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; | |
62f38300 MC |
1443 | debug_scsi("sending %d pad bytes for itt 0x%x\n", |
1444 | tcp_ctask->pad_count, ctask->itt); | |
1445 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1446 | &sent); | |
3219e529 | 1447 | if (rc) { |
62f38300 | 1448 | debug_scsi("padding send failed %d\n", rc); |
843c0a8a | 1449 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; |
7ba24713 | 1450 | } |
3219e529 | 1451 | return rc; |
7ba24713 AA |
1452 | } |
1453 | ||
62f38300 MC |
1454 | static int |
1455 | iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1456 | struct iscsi_buf *buf, uint32_t *digest) | |
7ba24713 | 1457 | { |
62f38300 MC |
1458 | struct iscsi_tcp_cmd_task *tcp_ctask; |
1459 | struct iscsi_tcp_conn *tcp_conn; | |
1460 | int rc, sent = 0; | |
5bb0b55a | 1461 | |
62f38300 MC |
1462 | if (!conn->datadgst_en) |
1463 | return 0; | |
7ba24713 | 1464 | |
62f38300 MC |
1465 | tcp_ctask = ctask->dd_data; |
1466 | tcp_conn = conn->dd_data; | |
7ba24713 | 1467 | |
843c0a8a | 1468 | if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
c9802cd9 | 1469 | crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
62f38300 MC |
1470 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
1471 | } | |
843c0a8a | 1472 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; |
7ba24713 | 1473 | |
62f38300 MC |
1474 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
1475 | if (!rc) | |
1476 | debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, | |
1477 | ctask->itt); | |
1478 | else { | |
1479 | debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", | |
1480 | *digest, ctask->itt); | |
843c0a8a | 1481 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; |
7ba24713 | 1482 | } |
62f38300 MC |
1483 | return rc; |
1484 | } | |
7ba24713 | 1485 | |
62f38300 MC |
1486 | static int |
1487 | iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, | |
1488 | struct scatterlist **sg, int *sent, int *count, | |
1489 | struct iscsi_buf *digestbuf, uint32_t *digest) | |
1490 | { | |
1491 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1492 | struct iscsi_conn *conn = ctask->conn; | |
1493 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1494 | int rc, buf_sent, offset; | |
1495 | ||
1496 | while (*count) { | |
1497 | buf_sent = 0; | |
1498 | offset = sendbuf->sent; | |
1499 | ||
1500 | rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); | |
1501 | *sent = *sent + buf_sent; | |
1502 | if (buf_sent && conn->datadgst_en) | |
c9802cd9 | 1503 | partial_sg_digest_update(&tcp_conn->tx_hash, |
62f38300 MC |
1504 | &sendbuf->sg, sendbuf->sg.offset + offset, |
1505 | buf_sent); | |
1506 | if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { | |
1507 | iscsi_buf_init_sg(sendbuf, *sg); | |
1508 | *sg = *sg + 1; | |
7ba24713 | 1509 | } |
62f38300 MC |
1510 | |
1511 | if (rc) | |
1512 | return rc; | |
7ba24713 AA |
1513 | } |
1514 | ||
62f38300 MC |
1515 | rc = iscsi_send_padding(conn, ctask); |
1516 | if (rc) | |
1517 | return rc; | |
1518 | ||
1519 | return iscsi_send_digest(conn, ctask, digestbuf, digest); | |
7ba24713 AA |
1520 | } |
1521 | ||
62f38300 MC |
1522 | static int |
1523 | iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1524 | { |
5bb0b55a | 1525 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1526 | struct iscsi_data_task *dtask; |
3219e529 | 1527 | int rc; |
7ba24713 | 1528 | |
843c0a8a MC |
1529 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1530 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
62f38300 MC |
1531 | dtask = &tcp_ctask->unsol_dtask; |
1532 | ||
ffd0436e MC |
1533 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
1534 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
1535 | sizeof(struct iscsi_hdr)); | |
af973481 | 1536 | if (conn->hdrdgst_en) |
5bb0b55a | 1537 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1538 | (u8*)dtask->hdrext); |
62f38300 | 1539 | |
843c0a8a | 1540 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
62f38300 | 1541 | iscsi_set_padding(tcp_ctask, ctask->data_count); |
7ba24713 | 1542 | } |
3219e529 MC |
1543 | |
1544 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1545 | if (rc) { | |
843c0a8a MC |
1546 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1547 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1548 | return rc; |
7ba24713 AA |
1549 | } |
1550 | ||
dd8c0d95 MC |
1551 | if (conn->datadgst_en) { |
1552 | dtask = &tcp_ctask->unsol_dtask; | |
1553 | iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); | |
1554 | dtask->digest = 0; | |
1555 | } | |
1556 | ||
7ba24713 | 1557 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
5bb0b55a | 1558 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1559 | return 0; |
1560 | } | |
1561 | ||
62f38300 MC |
1562 | static int |
1563 | iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1564 | { |
5bb0b55a | 1565 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1566 | int rc; |
7ba24713 | 1567 | |
843c0a8a | 1568 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
62f38300 | 1569 | BUG_ON(!ctask->unsol_count); |
843c0a8a | 1570 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
62f38300 MC |
1571 | send_hdr: |
1572 | rc = iscsi_send_unsol_hdr(conn, ctask); | |
1573 | if (rc) | |
1574 | return rc; | |
7ba24713 AA |
1575 | } |
1576 | ||
843c0a8a | 1577 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
62f38300 | 1578 | struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a | 1579 | int start = tcp_ctask->sent; |
7ba24713 | 1580 | |
62f38300 MC |
1581 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1582 | &tcp_ctask->sent, &ctask->data_count, | |
1583 | &dtask->digestbuf, &dtask->digest); | |
5bb0b55a | 1584 | ctask->unsol_count -= tcp_ctask->sent - start; |
62f38300 MC |
1585 | if (rc) |
1586 | return rc; | |
843c0a8a | 1587 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 | 1588 | /* |
62f38300 MC |
1589 | * Done with the Data-Out. Next, check if we need |
1590 | * to send another unsolicited Data-Out. | |
7ba24713 | 1591 | */ |
62f38300 MC |
1592 | if (ctask->unsol_count) { |
1593 | debug_scsi("sending more uns\n"); | |
843c0a8a | 1594 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
62f38300 | 1595 | goto send_hdr; |
7ba24713 | 1596 | } |
7ba24713 | 1597 | } |
7ba24713 AA |
1598 | return 0; |
1599 | } | |
1600 | ||
62f38300 MC |
1601 | static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
1602 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1603 | { |
5bb0b55a | 1604 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1605 | struct iscsi_session *session = conn->session; |
1606 | struct iscsi_r2t_info *r2t; | |
1607 | struct iscsi_data_task *dtask; | |
3219e529 | 1608 | int left, rc; |
7ba24713 | 1609 | |
843c0a8a | 1610 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) { |
db37c505 MC |
1611 | if (!tcp_ctask->r2t) { |
1612 | spin_lock_bh(&session->lock); | |
62f38300 MC |
1613 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1614 | sizeof(void*)); | |
db37c505 MC |
1615 | spin_unlock_bh(&session->lock); |
1616 | } | |
62f38300 MC |
1617 | send_hdr: |
1618 | r2t = tcp_ctask->r2t; | |
1619 | dtask = &r2t->dtask; | |
7ba24713 | 1620 | |
62f38300 MC |
1621 | if (conn->hdrdgst_en) |
1622 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
1623 | (u8*)dtask->hdrext); | |
843c0a8a MC |
1624 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT; |
1625 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
218432c6 MC |
1626 | } |
1627 | ||
843c0a8a | 1628 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
218432c6 MC |
1629 | r2t = tcp_ctask->r2t; |
1630 | dtask = &r2t->dtask; | |
1631 | ||
62f38300 | 1632 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
218432c6 | 1633 | if (rc) |
3219e529 | 1634 | return rc; |
843c0a8a MC |
1635 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1636 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
7ba24713 | 1637 | |
7ba24713 | 1638 | if (conn->datadgst_en) { |
dd8c0d95 MC |
1639 | iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
1640 | dtask->digest = 0; | |
7ba24713 | 1641 | } |
7ba24713 | 1642 | |
62f38300 MC |
1643 | iscsi_set_padding(tcp_ctask, r2t->data_count); |
1644 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1645 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1646 | r2t->sent); | |
7ba24713 AA |
1647 | } |
1648 | ||
843c0a8a | 1649 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
62f38300 MC |
1650 | r2t = tcp_ctask->r2t; |
1651 | dtask = &r2t->dtask; | |
7ba24713 | 1652 | |
62f38300 MC |
1653 | rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
1654 | &r2t->sent, &r2t->data_count, | |
1655 | &dtask->digestbuf, &dtask->digest); | |
1656 | if (rc) | |
1657 | return rc; | |
843c0a8a | 1658 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
7ba24713 | 1659 | |
62f38300 MC |
1660 | /* |
1661 | * Done with this Data-Out. Next, check if we have | |
1662 | * to send another Data-Out for this R2T. | |
1663 | */ | |
1664 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1665 | left = r2t->data_length - r2t->sent; | |
1666 | if (left) { | |
1667 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
62f38300 MC |
1668 | goto send_hdr; |
1669 | } | |
7ba24713 | 1670 | |
62f38300 MC |
1671 | /* |
1672 | * Done with this R2T. Check if there are more | |
1673 | * outstanding R2Ts ready to be processed. | |
1674 | */ | |
1675 | spin_lock_bh(&session->lock); | |
1676 | tcp_ctask->r2t = NULL; | |
1677 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
1678 | sizeof(void*)); | |
1679 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, | |
1680 | sizeof(void*))) { | |
1681 | tcp_ctask->r2t = r2t; | |
62f38300 MC |
1682 | spin_unlock_bh(&session->lock); |
1683 | goto send_hdr; | |
7ba24713 | 1684 | } |
62f38300 | 1685 | spin_unlock_bh(&session->lock); |
7ba24713 | 1686 | } |
7ba24713 AA |
1687 | return 0; |
1688 | } | |
1689 | ||
218432c6 MC |
1690 | /** |
1691 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1692 | * @conn: iscsi connection | |
1693 | * @ctask: iscsi command task | |
1694 | * | |
1695 | * Notes: | |
1696 | * The function can return -EAGAIN in which case caller must | |
1697 | * call it again later, or recover. '0' return code means successful | |
1698 | * xmit. | |
1699 | * The function is devided to logical helpers (above) for the different | |
1700 | * xmit stages. | |
1701 | * | |
1702 | *iscsi_send_cmd_hdr() | |
843c0a8a MC |
1703 | * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate |
1704 | * Header Digest | |
1705 | * XMSTATE_CMD_HDR_XMIT - Transmit header in progress | |
218432c6 MC |
1706 | * |
1707 | *iscsi_send_padding | |
843c0a8a MC |
1708 | * XMSTATE_W_PAD - Prepare and send pading |
1709 | * XMSTATE_W_RESEND_PAD - retry send pading | |
218432c6 MC |
1710 | * |
1711 | *iscsi_send_digest | |
843c0a8a MC |
1712 | * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest |
1713 | * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest | |
218432c6 MC |
1714 | * |
1715 | *iscsi_send_unsol_hdr | |
843c0a8a MC |
1716 | * XMSTATE_UNS_INIT - prepare un-solicit data header and digest |
1717 | * XMSTATE_UNS_HDR - send un-solicit header | |
218432c6 MC |
1718 | * |
1719 | *iscsi_send_unsol_pdu | |
843c0a8a | 1720 | * XMSTATE_UNS_DATA - send un-solicit data in progress |
218432c6 MC |
1721 | * |
1722 | *iscsi_send_sol_pdu | |
843c0a8a MC |
1723 | * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize |
1724 | * XMSTATE_SOL_HDR - send solicit header | |
1725 | * XMSTATE_SOL_DATA - send solicit data | |
218432c6 MC |
1726 | * |
1727 | *iscsi_tcp_ctask_xmit | |
843c0a8a | 1728 | * XMSTATE_IMM_DATA - xmit managment data (??) |
218432c6 | 1729 | **/ |
7ba24713 | 1730 | static int |
5bb0b55a | 1731 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1732 | { |
5bb0b55a | 1733 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1734 | int rc = 0; |
1735 | ||
1736 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1737 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 | 1738 | |
218432c6 MC |
1739 | rc = iscsi_send_cmd_hdr(conn, ctask); |
1740 | if (rc) | |
1741 | return rc; | |
1742 | if (ctask->sc->sc_data_direction != DMA_TO_DEVICE) | |
1743 | return 0; | |
7ba24713 | 1744 | |
843c0a8a | 1745 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
62f38300 MC |
1746 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1747 | &tcp_ctask->sent, &ctask->imm_count, | |
1748 | &tcp_ctask->immbuf, &tcp_ctask->immdigest); | |
7ba24713 AA |
1749 | if (rc) |
1750 | return rc; | |
843c0a8a | 1751 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1752 | } |
1753 | ||
62f38300 MC |
1754 | rc = iscsi_send_unsol_pdu(conn, ctask); |
1755 | if (rc) | |
1756 | return rc; | |
7ba24713 | 1757 | |
62f38300 MC |
1758 | rc = iscsi_send_sol_pdu(conn, ctask); |
1759 | if (rc) | |
1760 | return rc; | |
7ba24713 AA |
1761 | |
1762 | return rc; | |
1763 | } | |
1764 | ||
5bb0b55a MC |
1765 | static struct iscsi_cls_conn * |
1766 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1767 | { |
5bb0b55a MC |
1768 | struct iscsi_conn *conn; |
1769 | struct iscsi_cls_conn *cls_conn; | |
1770 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1771 | |
5bb0b55a MC |
1772 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1773 | if (!cls_conn) | |
1774 | return NULL; | |
1775 | conn = cls_conn->dd_data; | |
7ba24713 | 1776 | /* |
5bb0b55a MC |
1777 | * due to strange issues with iser these are not set |
1778 | * in iscsi_conn_setup | |
7ba24713 | 1779 | */ |
bf32ed33 | 1780 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1781 | |
5bb0b55a MC |
1782 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1783 | if (!tcp_conn) | |
1784 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1785 | |
5bb0b55a MC |
1786 | conn->dd_data = tcp_conn; |
1787 | tcp_conn->iscsi_conn = conn; | |
7ba24713 | 1788 | |
c9802cd9 JB |
1789 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1790 | CRYPTO_ALG_ASYNC); | |
1791 | tcp_conn->tx_hash.flags = 0; | |
0f238418 MC |
1792 | if (IS_ERR(tcp_conn->tx_hash.tfm)) { |
1793 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1794 | "loading error %ld. Make sure the crc32c module is " | |
1795 | "built as a module or into the kernel\n", | |
1796 | PTR_ERR(tcp_conn->tx_hash.tfm)); | |
dd8c0d95 | 1797 | goto free_tcp_conn; |
0f238418 | 1798 | } |
dd8c0d95 | 1799 | |
c9802cd9 JB |
1800 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1801 | CRYPTO_ALG_ASYNC); | |
1802 | tcp_conn->rx_hash.flags = 0; | |
0f238418 MC |
1803 | if (IS_ERR(tcp_conn->rx_hash.tfm)) { |
1804 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1805 | "loading error %ld. Make sure the crc32c module is " | |
1806 | "built as a module or into the kernel\n", | |
1807 | PTR_ERR(tcp_conn->rx_hash.tfm)); | |
dd8c0d95 | 1808 | goto free_tx_tfm; |
0f238418 | 1809 | } |
dd8c0d95 | 1810 | |
5bb0b55a | 1811 | return cls_conn; |
7ba24713 | 1812 | |
dd8c0d95 | 1813 | free_tx_tfm: |
c9802cd9 | 1814 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 MC |
1815 | free_tcp_conn: |
1816 | kfree(tcp_conn); | |
5bb0b55a MC |
1817 | tcp_conn_alloc_fail: |
1818 | iscsi_conn_teardown(cls_conn); | |
1819 | return NULL; | |
7ba24713 AA |
1820 | } |
1821 | ||
1c83469d MC |
1822 | static void |
1823 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1824 | { | |
22236961 | 1825 | struct iscsi_session *session = conn->session; |
1c83469d | 1826 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
22236961 | 1827 | struct socket *sock = tcp_conn->sock; |
1c83469d | 1828 | |
22236961 | 1829 | if (!sock) |
1c83469d MC |
1830 | return; |
1831 | ||
22236961 | 1832 | sock_hold(sock->sk); |
1c83469d | 1833 | iscsi_conn_restore_callbacks(tcp_conn); |
22236961 | 1834 | sock_put(sock->sk); |
1c83469d | 1835 | |
22236961 | 1836 | spin_lock_bh(&session->lock); |
1c83469d MC |
1837 | tcp_conn->sock = NULL; |
1838 | conn->recv_lock = NULL; | |
22236961 MC |
1839 | spin_unlock_bh(&session->lock); |
1840 | sockfd_put(sock); | |
1c83469d MC |
1841 | } |
1842 | ||
7ba24713 | 1843 | static void |
5bb0b55a | 1844 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1845 | { |
5bb0b55a MC |
1846 | struct iscsi_conn *conn = cls_conn->dd_data; |
1847 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1848 | |
1c83469d | 1849 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1850 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1851 | |
534284a0 PW |
1852 | if (tcp_conn->tx_hash.tfm) |
1853 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1854 | if (tcp_conn->rx_hash.tfm) | |
1855 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1856 | |
5bb0b55a MC |
1857 | kfree(tcp_conn); |
1858 | } | |
7ba24713 | 1859 | |
1c83469d MC |
1860 | static void |
1861 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1862 | { | |
1863 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1864 | ||
1865 | iscsi_conn_stop(cls_conn, flag); | |
1866 | iscsi_tcp_release_conn(conn); | |
1867 | } | |
1868 | ||
22236961 MC |
1869 | static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
1870 | char *buf, int *port, | |
1871 | int (*getname)(struct socket *, struct sockaddr *, | |
1872 | int *addrlen)) | |
1873 | { | |
1874 | struct sockaddr_storage *addr; | |
1875 | struct sockaddr_in6 *sin6; | |
1876 | struct sockaddr_in *sin; | |
1877 | int rc = 0, len; | |
1878 | ||
a9204879 | 1879 | addr = kmalloc(sizeof(*addr), GFP_KERNEL); |
22236961 MC |
1880 | if (!addr) |
1881 | return -ENOMEM; | |
1882 | ||
1883 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
1884 | rc = -ENODEV; | |
1885 | goto free_addr; | |
1886 | } | |
1887 | ||
1888 | switch (addr->ss_family) { | |
1889 | case AF_INET: | |
1890 | sin = (struct sockaddr_in *)addr; | |
1891 | spin_lock_bh(&conn->session->lock); | |
1892 | sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); | |
1893 | *port = be16_to_cpu(sin->sin_port); | |
1894 | spin_unlock_bh(&conn->session->lock); | |
1895 | break; | |
1896 | case AF_INET6: | |
1897 | sin6 = (struct sockaddr_in6 *)addr; | |
1898 | spin_lock_bh(&conn->session->lock); | |
1899 | sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr)); | |
1900 | *port = be16_to_cpu(sin6->sin6_port); | |
1901 | spin_unlock_bh(&conn->session->lock); | |
1902 | break; | |
1903 | } | |
1904 | free_addr: | |
1905 | kfree(addr); | |
1906 | return rc; | |
1907 | } | |
1908 | ||
5bb0b55a MC |
1909 | static int |
1910 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1911 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1912 | int is_leading) |
1913 | { | |
1914 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1915 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1916 | struct sock *sk; | |
1917 | struct socket *sock; | |
1918 | int err; | |
7ba24713 | 1919 | |
5bb0b55a | 1920 | /* lookup for existing socket */ |
264faaaa | 1921 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1922 | if (!sock) { |
1923 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1924 | return -EEXIST; | |
7ba24713 | 1925 | } |
22236961 MC |
1926 | /* |
1927 | * copy these values now because if we drop the session | |
1928 | * userspace may still want to query the values since we will | |
1929 | * be using them for the reconnect | |
1930 | */ | |
1931 | err = iscsi_tcp_get_addr(conn, sock, conn->portal_address, | |
1932 | &conn->portal_port, kernel_getpeername); | |
1933 | if (err) | |
1934 | goto free_socket; | |
1935 | ||
1936 | err = iscsi_tcp_get_addr(conn, sock, conn->local_address, | |
1937 | &conn->local_port, kernel_getsockname); | |
1938 | if (err) | |
1939 | goto free_socket; | |
7ba24713 | 1940 | |
5bb0b55a MC |
1941 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1942 | if (err) | |
22236961 | 1943 | goto free_socket; |
7ba24713 | 1944 | |
67a61114 MC |
1945 | /* bind iSCSI connection and socket */ |
1946 | tcp_conn->sock = sock; | |
7ba24713 | 1947 | |
67a61114 MC |
1948 | /* setup Socket parameters */ |
1949 | sk = sock->sk; | |
1950 | sk->sk_reuse = 1; | |
1951 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1952 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1953 | |
67a61114 | 1954 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1955 | |
67a61114 MC |
1956 | /* |
1957 | * Intercept TCP callbacks for sendfile like receive | |
1958 | * processing. | |
1959 | */ | |
1960 | conn->recv_lock = &sk->sk_callback_lock; | |
1961 | iscsi_conn_set_callbacks(conn); | |
1962 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1963 | /* | |
1964 | * set receive state machine into initial state | |
1965 | */ | |
da32dd68 | 1966 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 1967 | return 0; |
22236961 MC |
1968 | |
1969 | free_socket: | |
1970 | sockfd_put(sock); | |
1971 | return err; | |
7ba24713 AA |
1972 | } |
1973 | ||
5bb0b55a | 1974 | /* called with host lock */ |
30a6c652 | 1975 | static void |
77a23c21 | 1976 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1977 | { |
5bb0b55a | 1978 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
843c0a8a | 1979 | tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT; |
7ba24713 AA |
1980 | } |
1981 | ||
1982 | static int | |
1983 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1984 | { | |
1985 | int i; | |
1986 | int cmd_i; | |
1987 | ||
1988 | /* | |
1989 | * initialize per-task: R2T pool and xmit queue | |
1990 | */ | |
1991 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1992 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 1993 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1994 | |
1995 | /* | |
1996 | * pre-allocated x4 as much r2ts to handle race when | |
1997 | * target acks DataOut faster than we data_xmit() queues | |
1998 | * could replenish r2tqueue. | |
1999 | */ | |
2000 | ||
2001 | /* R2T pool */ | |
5bb0b55a MC |
2002 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2003 | (void***)&tcp_ctask->r2ts, | |
2004 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2005 | goto r2t_alloc_fail; |
2006 | } | |
2007 | ||
2008 | /* R2T xmit queue */ | |
5bb0b55a | 2009 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2010 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2011 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2012 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2013 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2014 | goto r2t_alloc_fail; |
2015 | } | |
7ba24713 AA |
2016 | } |
2017 | ||
2018 | return 0; | |
2019 | ||
2020 | r2t_alloc_fail: | |
2021 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2022 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2023 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2024 | ||
5bb0b55a MC |
2025 | kfifo_free(tcp_ctask->r2tqueue); |
2026 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2027 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2028 | } |
2029 | return -ENOMEM; | |
2030 | } | |
2031 | ||
2032 | static void | |
2033 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2034 | { | |
2035 | int i; | |
2036 | ||
2037 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2038 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2039 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2040 | |
5bb0b55a MC |
2041 | kfifo_free(tcp_ctask->r2tqueue); |
2042 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2043 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2044 | } |
7ba24713 AA |
2045 | } |
2046 | ||
2047 | static int | |
7b7232f3 | 2048 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2049 | char *buf, int buflen) |
7ba24713 | 2050 | { |
7b7232f3 | 2051 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2052 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2053 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2054 | int value; |
7ba24713 | 2055 | |
7ba24713 | 2056 | switch(param) { |
7ba24713 | 2057 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2058 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2059 | break; |
2060 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2061 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
2062 | tcp_conn->sendpage = conn->datadgst_en ? |
2063 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2064 | break; |
7ba24713 | 2065 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2066 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2067 | if (session->max_r2t == roundup_pow_of_two(value)) |
2068 | break; | |
2069 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2070 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2071 | if (session->max_r2t & (session->max_r2t - 1)) |
2072 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2073 | if (iscsi_r2tpool_alloc(session)) | |
2074 | return -ENOMEM; | |
2075 | break; | |
7ba24713 | 2076 | default: |
5c75b7fc | 2077 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2078 | } |
2079 | ||
2080 | return 0; | |
2081 | } | |
2082 | ||
2083 | static int | |
5c75b7fc MC |
2084 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2085 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2086 | { |
7b7232f3 | 2087 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 2088 | int len; |
7b8631b5 MC |
2089 | |
2090 | switch(param) { | |
fd7255f5 | 2091 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
2092 | spin_lock_bh(&conn->session->lock); |
2093 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
2094 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 2095 | break; |
fd7255f5 | 2096 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
2097 | spin_lock_bh(&conn->session->lock); |
2098 | len = sprintf(buf, "%s\n", conn->portal_address); | |
2099 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
2100 | break; |
2101 | default: | |
5c75b7fc | 2102 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2103 | } |
2104 | ||
2105 | return len; | |
2106 | } | |
2107 | ||
22236961 MC |
2108 | static int |
2109 | iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2110 | char *buf) | |
2111 | { | |
2112 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2113 | int len; | |
2114 | ||
2115 | switch (param) { | |
2116 | case ISCSI_HOST_PARAM_IPADDRESS: | |
2117 | spin_lock_bh(&session->lock); | |
2118 | if (!session->leadconn) | |
2119 | len = -ENODEV; | |
2120 | else | |
2121 | len = sprintf(buf, "%s\n", | |
2122 | session->leadconn->local_address); | |
2123 | spin_unlock_bh(&session->lock); | |
2124 | break; | |
2125 | default: | |
2126 | return iscsi_host_get_param(shost, param, buf); | |
2127 | } | |
2128 | return len; | |
2129 | } | |
2130 | ||
7ba24713 | 2131 | static void |
7b7232f3 | 2132 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2133 | { |
7b7232f3 | 2134 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2135 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2136 | |
2137 | stats->txdata_octets = conn->txdata_octets; | |
2138 | stats->rxdata_octets = conn->rxdata_octets; | |
2139 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2140 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2141 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2142 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2143 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2144 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2145 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2146 | stats->custom_length = 3; | |
2147 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2148 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2149 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2150 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2151 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2152 | stats->custom[2].value = conn->eh_abort_cnt; | |
2153 | } | |
2154 | ||
5bb0b55a MC |
2155 | static struct iscsi_cls_session * |
2156 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2157 | struct scsi_transport_template *scsit, | |
1548271e | 2158 | uint16_t cmds_max, uint16_t qdepth, |
5bb0b55a | 2159 | uint32_t initial_cmdsn, uint32_t *hostno) |
7ba24713 | 2160 | { |
5bb0b55a MC |
2161 | struct iscsi_cls_session *cls_session; |
2162 | struct iscsi_session *session; | |
2163 | uint32_t hn; | |
2164 | int cmd_i; | |
7ba24713 | 2165 | |
1548271e | 2166 | cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth, |
5bb0b55a MC |
2167 | sizeof(struct iscsi_tcp_cmd_task), |
2168 | sizeof(struct iscsi_tcp_mgmt_task), | |
2169 | initial_cmdsn, &hn); | |
2170 | if (!cls_session) | |
2171 | return NULL; | |
2172 | *hostno = hn; | |
7ba24713 | 2173 | |
5bb0b55a MC |
2174 | session = class_to_transport_session(cls_session); |
2175 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2176 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2177 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2178 | ||
2179 | ctask->hdr = &tcp_ctask->hdr; | |
2180 | } | |
2181 | ||
2182 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2183 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2184 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2185 | ||
2186 | mtask->hdr = &tcp_mtask->hdr; | |
2187 | } | |
2188 | ||
2189 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2190 | goto r2tpool_alloc_fail; | |
2191 | ||
2192 | return cls_session; | |
2193 | ||
2194 | r2tpool_alloc_fail: | |
2195 | iscsi_session_teardown(cls_session); | |
2196 | return NULL; | |
2197 | } | |
2198 | ||
2199 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2200 | { | |
5bb0b55a MC |
2201 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2202 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2203 | } |
2204 | ||
d1d81c01 MC |
2205 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) |
2206 | { | |
b6d44fe9 | 2207 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
2208 | blk_queue_dma_alignment(sdev->request_queue, 0); |
2209 | return 0; | |
2210 | } | |
2211 | ||
5bb0b55a | 2212 | static struct scsi_host_template iscsi_sht = { |
7974392c | 2213 | .module = THIS_MODULE, |
f4246b33 | 2214 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2215 | .queuecommand = iscsi_queuecommand, |
2216 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 2217 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
5bb0b55a | 2218 | .sg_tablesize = ISCSI_SG_TABLESIZE, |
8231f0ed | 2219 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
2220 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
2221 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 2222 | .eh_device_reset_handler= iscsi_eh_device_reset, |
5bb0b55a MC |
2223 | .eh_host_reset_handler = iscsi_eh_host_reset, |
2224 | .use_clustering = DISABLE_CLUSTERING, | |
d1d81c01 | 2225 | .slave_configure = iscsi_tcp_slave_configure, |
5bb0b55a MC |
2226 | .proc_name = "iscsi_tcp", |
2227 | .this_id = -1, | |
2228 | }; | |
2229 | ||
7ba24713 AA |
2230 | static struct iscsi_transport iscsi_tcp_transport = { |
2231 | .owner = THIS_MODULE, | |
2232 | .name = "tcp", | |
2233 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2234 | | CAP_DATADGST, | |
fd7255f5 MC |
2235 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2236 | ISCSI_MAX_XMIT_DLENGTH | | |
2237 | ISCSI_HDRDGST_EN | | |
2238 | ISCSI_DATADGST_EN | | |
2239 | ISCSI_INITIAL_R2T_EN | | |
2240 | ISCSI_MAX_R2T | | |
2241 | ISCSI_IMM_DATA_EN | | |
2242 | ISCSI_FIRST_BURST | | |
2243 | ISCSI_MAX_BURST | | |
2244 | ISCSI_PDU_INORDER_EN | | |
2245 | ISCSI_DATASEQ_INORDER_EN | | |
2246 | ISCSI_ERL | | |
2247 | ISCSI_CONN_PORT | | |
8d2860b3 | 2248 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2249 | ISCSI_EXP_STATSN | |
2250 | ISCSI_PERSISTENT_PORT | | |
2251 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
2252 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
2253 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
843c0a8a MC |
2254 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
2255 | ISCSI_FAST_ABORT, | |
22236961 | 2256 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
2257 | ISCSI_HOST_INITIATOR_NAME | |
2258 | ISCSI_HOST_NETDEV_NAME, | |
7ba24713 | 2259 | .host_template = &iscsi_sht, |
7b8631b5 | 2260 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2261 | .max_conn = 1, |
2262 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2263 | /* session management */ |
2264 | .create_session = iscsi_tcp_session_create, | |
2265 | .destroy_session = iscsi_tcp_session_destroy, | |
2266 | /* connection management */ | |
2267 | .create_conn = iscsi_tcp_conn_create, | |
2268 | .bind_conn = iscsi_tcp_conn_bind, | |
2269 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2270 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2271 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2272 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2273 | .start_conn = iscsi_conn_start, |
1c83469d | 2274 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 | 2275 | /* iscsi host params */ |
22236961 | 2276 | .get_host_param = iscsi_tcp_host_get_param, |
0801c242 | 2277 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 2278 | /* IO */ |
7ba24713 AA |
2279 | .send_pdu = iscsi_conn_send_pdu, |
2280 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2281 | .init_cmd_task = iscsi_tcp_cmd_init, |
2282 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2283 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2284 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2285 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2286 | /* recovery */ | |
30a6c652 | 2287 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2288 | }; |
2289 | ||
2290 | static int __init | |
2291 | iscsi_tcp_init(void) | |
2292 | { | |
7ba24713 | 2293 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2294 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2295 | iscsi_max_lun); | |
7ba24713 AA |
2296 | return -EINVAL; |
2297 | } | |
2298 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2299 | ||
7b8631b5 | 2300 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2301 | return -ENODEV; |
7ba24713 | 2302 | |
7b8631b5 | 2303 | return 0; |
7ba24713 AA |
2304 | } |
2305 | ||
2306 | static void __exit | |
2307 | iscsi_tcp_exit(void) | |
2308 | { | |
2309 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2310 | } |
2311 | ||
2312 | module_init(iscsi_tcp_init); | |
2313 | module_exit(iscsi_tcp_exit); |