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[SCSI] iscsi bugfixes: fix oops when iser is flushing io
[deliverable/linux.git] / drivers / scsi / iscsi_tcp.c
1 /*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * See the file COPYING included with this distribution for more details.
21 *
22 * Credits:
23 * Christoph Hellwig
24 * FUJITA Tomonori
25 * Arne Redlich
26 * Zhenyu Wang
27 */
28
29 #include <linux/types.h>
30 #include <linux/list.h>
31 #include <linux/inet.h>
32 #include <linux/blkdev.h>
33 #include <linux/crypto.h>
34 #include <linux/delay.h>
35 #include <linux/kfifo.h>
36 #include <linux/scatterlist.h>
37 #include <linux/mutex.h>
38 #include <net/tcp.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_transport_iscsi.h>
43
44 #include "iscsi_tcp.h"
45
46 #define ISCSI_TCP_VERSION "1.0-595"
47
48 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
49 "Alex Aizman <itn780@yahoo.com>");
50 MODULE_DESCRIPTION("iSCSI/TCP data-path");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION(ISCSI_TCP_VERSION);
53 /* #define DEBUG_TCP */
54 #define DEBUG_ASSERT
55
56 #ifdef DEBUG_TCP
57 #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
58 #else
59 #define debug_tcp(fmt...)
60 #endif
61
62 #ifndef DEBUG_ASSERT
63 #ifdef BUG_ON
64 #undef BUG_ON
65 #endif
66 #define BUG_ON(expr)
67 #endif
68
69 static unsigned int iscsi_max_lun = 512;
70 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
71
72 static inline void
73 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
74 {
75 ibuf->sg.page = virt_to_page(vbuf);
76 ibuf->sg.offset = offset_in_page(vbuf);
77 ibuf->sg.length = size;
78 ibuf->sent = 0;
79 ibuf->use_sendmsg = 1;
80 }
81
82 static inline void
83 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
84 {
85 ibuf->sg.page = sg->page;
86 ibuf->sg.offset = sg->offset;
87 ibuf->sg.length = sg->length;
88 /*
89 * Fastpath: sg element fits into single page
90 */
91 if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
92 ibuf->use_sendmsg = 0;
93 else
94 ibuf->use_sendmsg = 1;
95 ibuf->sent = 0;
96 }
97
98 static inline int
99 iscsi_buf_left(struct iscsi_buf *ibuf)
100 {
101 int rc;
102
103 rc = ibuf->sg.length - ibuf->sent;
104 BUG_ON(rc < 0);
105 return rc;
106 }
107
108 static inline void
109 iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
110 u8* crc)
111 {
112 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
113
114 crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc);
115 buf->sg.length += sizeof(uint32_t);
116 }
117
118 static inline int
119 iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
120 {
121 struct sk_buff *skb = tcp_conn->in.skb;
122
123 tcp_conn->in.zero_copy_hdr = 0;
124
125 if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
126 tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
127 /*
128 * Zero-copy PDU Header: using connection context
129 * to store header pointer.
130 */
131 if (skb_shinfo(skb)->frag_list == NULL &&
132 !skb_shinfo(skb)->nr_frags) {
133 tcp_conn->in.hdr = (struct iscsi_hdr *)
134 ((char*)skb->data + tcp_conn->in.offset);
135 tcp_conn->in.zero_copy_hdr = 1;
136 } else {
137 /* ignoring return code since we checked
138 * in.copy before */
139 skb_copy_bits(skb, tcp_conn->in.offset,
140 &tcp_conn->hdr, tcp_conn->hdr_size);
141 tcp_conn->in.hdr = &tcp_conn->hdr;
142 }
143 tcp_conn->in.offset += tcp_conn->hdr_size;
144 tcp_conn->in.copy -= tcp_conn->hdr_size;
145 } else {
146 int hdr_remains;
147 int copylen;
148
149 /*
150 * PDU header scattered across SKB's,
151 * copying it... This'll happen quite rarely.
152 */
153
154 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
155 tcp_conn->in.hdr_offset = 0;
156
157 hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
158 BUG_ON(hdr_remains <= 0);
159
160 copylen = min(tcp_conn->in.copy, hdr_remains);
161 skb_copy_bits(skb, tcp_conn->in.offset,
162 (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
163 copylen);
164
165 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
166 "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
167 tcp_conn->in.offset, tcp_conn->in.copy);
168
169 tcp_conn->in.offset += copylen;
170 tcp_conn->in.copy -= copylen;
171 if (copylen < hdr_remains) {
172 tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
173 tcp_conn->in.hdr_offset += copylen;
174 return -EAGAIN;
175 }
176 tcp_conn->in.hdr = &tcp_conn->hdr;
177 tcp_conn->discontiguous_hdr_cnt++;
178 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
179 }
180
181 return 0;
182 }
183
184 /*
185 * must be called with session lock
186 */
187 static void
188 iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
189 {
190 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
191 struct iscsi_r2t_info *r2t;
192 struct scsi_cmnd *sc;
193
194 /* flush ctask's r2t queues */
195 while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
196 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
197 sizeof(void*));
198 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
199 }
200
201 sc = ctask->sc;
202 if (unlikely(!sc))
203 return;
204
205 tcp_ctask->xmstate = XMSTATE_IDLE;
206 tcp_ctask->r2t = NULL;
207 }
208
209 /**
210 * iscsi_data_rsp - SCSI Data-In Response processing
211 * @conn: iscsi connection
212 * @ctask: scsi command task
213 **/
214 static int
215 iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
216 {
217 int rc;
218 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
219 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
220 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
221 struct iscsi_session *session = conn->session;
222 int datasn = be32_to_cpu(rhdr->datasn);
223
224 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
225 if (rc)
226 return rc;
227 /*
228 * setup Data-In byte counter (gets decremented..)
229 */
230 ctask->data_count = tcp_conn->in.datalen;
231
232 if (tcp_conn->in.datalen == 0)
233 return 0;
234
235 if (ctask->datasn != datasn)
236 return ISCSI_ERR_DATASN;
237
238 ctask->datasn++;
239
240 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
241 if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
242 return ISCSI_ERR_DATA_OFFSET;
243
244 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
245 struct scsi_cmnd *sc = ctask->sc;
246
247 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
248 if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
249 int res_count = be32_to_cpu(rhdr->residual_count);
250
251 if (res_count > 0 &&
252 res_count <= sc->request_bufflen) {
253 sc->resid = res_count;
254 sc->result = (DID_OK << 16) | rhdr->cmd_status;
255 } else
256 sc->result = (DID_BAD_TARGET << 16) |
257 rhdr->cmd_status;
258 } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
259 sc->resid = be32_to_cpu(rhdr->residual_count);
260 sc->result = (DID_OK << 16) | rhdr->cmd_status;
261 } else
262 sc->result = (DID_OK << 16) | rhdr->cmd_status;
263 }
264
265 conn->datain_pdus_cnt++;
266 return 0;
267 }
268
269 /**
270 * iscsi_solicit_data_init - initialize first Data-Out
271 * @conn: iscsi connection
272 * @ctask: scsi command task
273 * @r2t: R2T info
274 *
275 * Notes:
276 * Initialize first Data-Out within this R2T sequence and finds
277 * proper data_offset within this SCSI command.
278 *
279 * This function is called with connection lock taken.
280 **/
281 static void
282 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
283 struct iscsi_r2t_info *r2t)
284 {
285 struct iscsi_data *hdr;
286 struct scsi_cmnd *sc = ctask->sc;
287 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
288
289 hdr = &r2t->dtask.hdr;
290 memset(hdr, 0, sizeof(struct iscsi_data));
291 hdr->ttt = r2t->ttt;
292 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
293 r2t->solicit_datasn++;
294 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
295 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
296 hdr->itt = ctask->hdr->itt;
297 hdr->exp_statsn = r2t->exp_statsn;
298 hdr->offset = cpu_to_be32(r2t->data_offset);
299 if (r2t->data_length > conn->max_xmit_dlength) {
300 hton24(hdr->dlength, conn->max_xmit_dlength);
301 r2t->data_count = conn->max_xmit_dlength;
302 hdr->flags = 0;
303 } else {
304 hton24(hdr->dlength, r2t->data_length);
305 r2t->data_count = r2t->data_length;
306 hdr->flags = ISCSI_FLAG_CMD_FINAL;
307 }
308 conn->dataout_pdus_cnt++;
309
310 r2t->sent = 0;
311
312 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
313 sizeof(struct iscsi_hdr));
314
315 if (sc->use_sg) {
316 int i, sg_count = 0;
317 struct scatterlist *sg = sc->request_buffer;
318
319 r2t->sg = NULL;
320 for (i = 0; i < sc->use_sg; i++, sg += 1) {
321 /* FIXME: prefetch ? */
322 if (sg_count + sg->length > r2t->data_offset) {
323 int page_offset;
324
325 /* sg page found! */
326
327 /* offset within this page */
328 page_offset = r2t->data_offset - sg_count;
329
330 /* fill in this buffer */
331 iscsi_buf_init_sg(&r2t->sendbuf, sg);
332 r2t->sendbuf.sg.offset += page_offset;
333 r2t->sendbuf.sg.length -= page_offset;
334
335 /* xmit logic will continue with next one */
336 r2t->sg = sg + 1;
337 break;
338 }
339 sg_count += sg->length;
340 }
341 BUG_ON(r2t->sg == NULL);
342 } else
343 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
344 (char*)sc->request_buffer + r2t->data_offset,
345 r2t->data_count);
346 }
347
348 /**
349 * iscsi_r2t_rsp - iSCSI R2T Response processing
350 * @conn: iscsi connection
351 * @ctask: scsi command task
352 **/
353 static int
354 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
355 {
356 struct iscsi_r2t_info *r2t;
357 struct iscsi_session *session = conn->session;
358 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
359 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
360 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
361 int r2tsn = be32_to_cpu(rhdr->r2tsn);
362 int rc;
363
364 if (tcp_conn->in.datalen)
365 return ISCSI_ERR_DATALEN;
366
367 if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
368 return ISCSI_ERR_R2TSN;
369
370 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
371 if (rc)
372 return rc;
373
374 /* FIXME: use R2TSN to detect missing R2T */
375
376 /* fill-in new R2T associated with the task */
377 spin_lock(&session->lock);
378 if (!ctask->sc || ctask->mtask ||
379 session->state != ISCSI_STATE_LOGGED_IN) {
380 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
381 "recovery...\n", ctask->itt);
382 spin_unlock(&session->lock);
383 return 0;
384 }
385
386 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
387 BUG_ON(!rc);
388
389 r2t->exp_statsn = rhdr->statsn;
390 r2t->data_length = be32_to_cpu(rhdr->data_length);
391 if (r2t->data_length == 0 ||
392 r2t->data_length > session->max_burst) {
393 spin_unlock(&session->lock);
394 return ISCSI_ERR_DATALEN;
395 }
396
397 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
398 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
399 spin_unlock(&session->lock);
400 return ISCSI_ERR_DATALEN;
401 }
402
403 r2t->ttt = rhdr->ttt; /* no flip */
404 r2t->solicit_datasn = 0;
405
406 iscsi_solicit_data_init(conn, ctask, r2t);
407
408 tcp_ctask->exp_r2tsn = r2tsn + 1;
409 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
410 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
411 list_move_tail(&ctask->running, &conn->xmitqueue);
412
413 scsi_queue_work(session->host, &conn->xmitwork);
414 conn->r2t_pdus_cnt++;
415 spin_unlock(&session->lock);
416
417 return 0;
418 }
419
420 static int
421 iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
422 {
423 int rc = 0, opcode, ahslen;
424 struct iscsi_hdr *hdr;
425 struct iscsi_session *session = conn->session;
426 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
427 uint32_t cdgst, rdgst = 0, itt;
428
429 hdr = tcp_conn->in.hdr;
430
431 /* verify PDU length */
432 tcp_conn->in.datalen = ntoh24(hdr->dlength);
433 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
434 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
435 tcp_conn->in.datalen, conn->max_recv_dlength);
436 return ISCSI_ERR_DATALEN;
437 }
438 tcp_conn->data_copied = 0;
439
440 /* read AHS */
441 ahslen = hdr->hlength << 2;
442 tcp_conn->in.offset += ahslen;
443 tcp_conn->in.copy -= ahslen;
444 if (tcp_conn->in.copy < 0) {
445 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
446 "%d bytes\n", ahslen);
447 return ISCSI_ERR_AHSLEN;
448 }
449
450 /* calculate read padding */
451 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
452 if (tcp_conn->in.padding) {
453 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
454 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
455 }
456
457 if (conn->hdrdgst_en) {
458 struct scatterlist sg;
459
460 sg_init_one(&sg, (u8 *)hdr,
461 sizeof(struct iscsi_hdr) + ahslen);
462 crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
463 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
464 ahslen);
465 if (cdgst != rdgst) {
466 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
467 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
468 return ISCSI_ERR_HDR_DGST;
469 }
470 }
471
472 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
473 /* verify itt (itt encoding: age+cid+itt) */
474 rc = iscsi_verify_itt(conn, hdr, &itt);
475 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
476 tcp_conn->in.datalen = 0; /* force drop */
477 return 0;
478 } else if (rc)
479 return rc;
480
481 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
482 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
483 ahslen, tcp_conn->in.datalen);
484
485 switch(opcode) {
486 case ISCSI_OP_SCSI_DATA_IN:
487 tcp_conn->in.ctask = session->cmds[itt];
488 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
489 if (rc)
490 return rc;
491 /* fall through */
492 case ISCSI_OP_SCSI_CMD_RSP:
493 tcp_conn->in.ctask = session->cmds[itt];
494 if (tcp_conn->in.datalen)
495 goto copy_hdr;
496
497 spin_lock(&session->lock);
498 iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask);
499 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
500 spin_unlock(&session->lock);
501 break;
502 case ISCSI_OP_R2T:
503 tcp_conn->in.ctask = session->cmds[itt];
504 if (ahslen)
505 rc = ISCSI_ERR_AHSLEN;
506 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
507 DMA_TO_DEVICE)
508 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
509 else
510 rc = ISCSI_ERR_PROTO;
511 break;
512 case ISCSI_OP_LOGIN_RSP:
513 case ISCSI_OP_TEXT_RSP:
514 case ISCSI_OP_LOGOUT_RSP:
515 case ISCSI_OP_NOOP_IN:
516 case ISCSI_OP_REJECT:
517 case ISCSI_OP_ASYNC_EVENT:
518 if (tcp_conn->in.datalen)
519 goto copy_hdr;
520 /* fall through */
521 case ISCSI_OP_SCSI_TMFUNC_RSP:
522 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
523 break;
524 default:
525 rc = ISCSI_ERR_BAD_OPCODE;
526 break;
527 }
528
529 return rc;
530
531 copy_hdr:
532 /*
533 * if we did zero copy for the header but we will need multiple
534 * skbs to complete the command then we have to copy the header
535 * for later use
536 */
537 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
538 (tcp_conn->in.datalen + tcp_conn->in.padding +
539 (conn->datadgst_en ? 4 : 0))) {
540 debug_tcp("Copying header for later use. in.copy %d in.datalen"
541 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
542 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
543 sizeof(struct iscsi_hdr));
544 tcp_conn->in.hdr = &tcp_conn->hdr;
545 tcp_conn->in.zero_copy_hdr = 0;
546 }
547 return 0;
548 }
549
550 /**
551 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
552 * @conn: iscsi tcp connection
553 * @ctask: scsi command task
554 * @buf: buffer to copy to
555 * @buf_size: size of buffer
556 * @offset: offset within the buffer
557 *
558 * Notes:
559 * The function calls skb_copy_bits() and updates per-connection and
560 * per-cmd byte counters.
561 *
562 * Read counters (in bytes):
563 *
564 * conn->in.offset offset within in progress SKB
565 * conn->in.copy left to copy from in progress SKB
566 * including padding
567 * conn->in.copied copied already from in progress SKB
568 * conn->data_copied copied already from in progress buffer
569 * ctask->sent total bytes sent up to the MidLayer
570 * ctask->data_count left to copy from in progress Data-In
571 * buf_left left to copy from in progress buffer
572 **/
573 static inline int
574 iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
575 void *buf, int buf_size, int offset)
576 {
577 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
578 int buf_left = buf_size - (tcp_conn->data_copied + offset);
579 int size = min(tcp_conn->in.copy, buf_left);
580 int rc;
581
582 size = min(size, ctask->data_count);
583
584 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
585 size, tcp_conn->in.offset, tcp_conn->in.copied);
586
587 BUG_ON(size <= 0);
588 BUG_ON(tcp_ctask->sent + size > ctask->total_length);
589
590 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
591 (char*)buf + (offset + tcp_conn->data_copied), size);
592 /* must fit into skb->len */
593 BUG_ON(rc);
594
595 tcp_conn->in.offset += size;
596 tcp_conn->in.copy -= size;
597 tcp_conn->in.copied += size;
598 tcp_conn->data_copied += size;
599 tcp_ctask->sent += size;
600 ctask->data_count -= size;
601
602 BUG_ON(tcp_conn->in.copy < 0);
603 BUG_ON(ctask->data_count < 0);
604
605 if (buf_size != (tcp_conn->data_copied + offset)) {
606 if (!ctask->data_count) {
607 BUG_ON(buf_size - tcp_conn->data_copied < 0);
608 /* done with this PDU */
609 return buf_size - tcp_conn->data_copied;
610 }
611 return -EAGAIN;
612 }
613
614 /* done with this buffer or with both - PDU and buffer */
615 tcp_conn->data_copied = 0;
616 return 0;
617 }
618
619 /**
620 * iscsi_tcp_copy - copy skb bits to the destanation buffer
621 * @conn: iscsi tcp connection
622 *
623 * Notes:
624 * The function calls skb_copy_bits() and updates per-connection
625 * byte counters.
626 **/
627 static inline int
628 iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn)
629 {
630 void *buf = tcp_conn->data;
631 int buf_size = tcp_conn->in.datalen;
632 int buf_left = buf_size - tcp_conn->data_copied;
633 int size = min(tcp_conn->in.copy, buf_left);
634 int rc;
635
636 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
637 size, tcp_conn->in.offset, tcp_conn->data_copied);
638 BUG_ON(size <= 0);
639
640 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
641 (char*)buf + tcp_conn->data_copied, size);
642 BUG_ON(rc);
643
644 tcp_conn->in.offset += size;
645 tcp_conn->in.copy -= size;
646 tcp_conn->in.copied += size;
647 tcp_conn->data_copied += size;
648
649 if (buf_size != tcp_conn->data_copied)
650 return -EAGAIN;
651
652 return 0;
653 }
654
655 static inline void
656 partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn,
657 struct scatterlist *sg, int offset, int length)
658 {
659 struct scatterlist temp;
660
661 memcpy(&temp, sg, sizeof(struct scatterlist));
662 temp.offset = offset;
663 temp.length = length;
664 crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1);
665 }
666
667 static void
668 iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
669 {
670 struct scatterlist tmp;
671
672 sg_init_one(&tmp, buf, len);
673 crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1);
674 }
675
676 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
677 {
678 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
679 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
680 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
681 struct scsi_cmnd *sc = ctask->sc;
682 struct scatterlist *sg;
683 int i, offset, rc = 0;
684
685 BUG_ON((void*)ctask != sc->SCp.ptr);
686
687 /*
688 * copying Data-In into the Scsi_Cmnd
689 */
690 if (!sc->use_sg) {
691 i = ctask->data_count;
692 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
693 sc->request_bufflen,
694 tcp_ctask->data_offset);
695 if (rc == -EAGAIN)
696 return rc;
697 if (conn->datadgst_en)
698 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
699 i);
700 rc = 0;
701 goto done;
702 }
703
704 offset = tcp_ctask->data_offset;
705 sg = sc->request_buffer;
706
707 if (tcp_ctask->data_offset)
708 for (i = 0; i < tcp_ctask->sg_count; i++)
709 offset -= sg[i].length;
710 /* we've passed through partial sg*/
711 if (offset < 0)
712 offset = 0;
713
714 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
715 char *dest;
716
717 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
718 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
719 sg[i].length, offset);
720 kunmap_atomic(dest, KM_SOFTIRQ0);
721 if (rc == -EAGAIN)
722 /* continue with the next SKB/PDU */
723 return rc;
724 if (!rc) {
725 if (conn->datadgst_en) {
726 if (!offset)
727 crypto_digest_update(
728 tcp_conn->data_rx_tfm,
729 &sg[i], 1);
730 else
731 partial_sg_digest_update(tcp_conn,
732 &sg[i],
733 sg[i].offset + offset,
734 sg[i].length - offset);
735 }
736 offset = 0;
737 tcp_ctask->sg_count++;
738 }
739
740 if (!ctask->data_count) {
741 if (rc && conn->datadgst_en)
742 /*
743 * data-in is complete, but buffer not...
744 */
745 partial_sg_digest_update(tcp_conn, &sg[i],
746 sg[i].offset, sg[i].length-rc);
747 rc = 0;
748 break;
749 }
750
751 if (!tcp_conn->in.copy)
752 return -EAGAIN;
753 }
754 BUG_ON(ctask->data_count);
755
756 done:
757 /* check for non-exceptional status */
758 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
759 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
760 (long)sc, sc->result, ctask->itt,
761 tcp_conn->in.hdr->flags);
762 spin_lock(&conn->session->lock);
763 iscsi_tcp_cleanup_ctask(conn, ctask);
764 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
765 spin_unlock(&conn->session->lock);
766 }
767
768 return rc;
769 }
770
771 static int
772 iscsi_data_recv(struct iscsi_conn *conn)
773 {
774 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
775 int rc = 0, opcode;
776
777 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
778 switch (opcode) {
779 case ISCSI_OP_SCSI_DATA_IN:
780 rc = iscsi_scsi_data_in(conn);
781 break;
782 case ISCSI_OP_SCSI_CMD_RSP:
783 spin_lock(&conn->session->lock);
784 iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask);
785 spin_unlock(&conn->session->lock);
786 case ISCSI_OP_TEXT_RSP:
787 case ISCSI_OP_LOGIN_RSP:
788 case ISCSI_OP_NOOP_IN:
789 case ISCSI_OP_ASYNC_EVENT:
790 case ISCSI_OP_REJECT:
791 /*
792 * Collect data segment to the connection's data
793 * placeholder
794 */
795 if (iscsi_tcp_copy(tcp_conn)) {
796 rc = -EAGAIN;
797 goto exit;
798 }
799
800 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data,
801 tcp_conn->in.datalen);
802 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
803 iscsi_recv_digest_update(tcp_conn, tcp_conn->data,
804 tcp_conn->in.datalen);
805 break;
806 default:
807 BUG_ON(1);
808 }
809 exit:
810 return rc;
811 }
812
813 /**
814 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
815 * @rd_desc: read descriptor
816 * @skb: socket buffer
817 * @offset: offset in skb
818 * @len: skb->len - offset
819 **/
820 static int
821 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
822 unsigned int offset, size_t len)
823 {
824 int rc;
825 struct iscsi_conn *conn = rd_desc->arg.data;
826 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
827 int processed;
828 char pad[ISCSI_PAD_LEN];
829 struct scatterlist sg;
830
831 /*
832 * Save current SKB and its offset in the corresponding
833 * connection context.
834 */
835 tcp_conn->in.copy = skb->len - offset;
836 tcp_conn->in.offset = offset;
837 tcp_conn->in.skb = skb;
838 tcp_conn->in.len = tcp_conn->in.copy;
839 BUG_ON(tcp_conn->in.copy <= 0);
840 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
841
842 more:
843 tcp_conn->in.copied = 0;
844 rc = 0;
845
846 if (unlikely(conn->suspend_rx)) {
847 debug_tcp("conn %d Rx suspended!\n", conn->id);
848 return 0;
849 }
850
851 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
852 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
853 rc = iscsi_hdr_extract(tcp_conn);
854 if (rc) {
855 if (rc == -EAGAIN)
856 goto nomore;
857 else {
858 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
859 return 0;
860 }
861 }
862
863 /*
864 * Verify and process incoming PDU header.
865 */
866 rc = iscsi_tcp_hdr_recv(conn);
867 if (!rc && tcp_conn->in.datalen) {
868 if (conn->datadgst_en) {
869 BUG_ON(!tcp_conn->data_rx_tfm);
870 crypto_digest_init(tcp_conn->data_rx_tfm);
871 }
872 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
873 } else if (rc) {
874 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
875 return 0;
876 }
877 }
878
879 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
880 uint32_t recv_digest;
881
882 debug_tcp("extra data_recv offset %d copy %d\n",
883 tcp_conn->in.offset, tcp_conn->in.copy);
884 skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
885 &recv_digest, 4);
886 tcp_conn->in.offset += 4;
887 tcp_conn->in.copy -= 4;
888 if (recv_digest != tcp_conn->in.datadgst) {
889 debug_tcp("iscsi_tcp: data digest error!"
890 "0x%x != 0x%x\n", recv_digest,
891 tcp_conn->in.datadgst);
892 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
893 return 0;
894 } else {
895 debug_tcp("iscsi_tcp: data digest match!"
896 "0x%x == 0x%x\n", recv_digest,
897 tcp_conn->in.datadgst);
898 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
899 }
900 }
901
902 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
903 tcp_conn->in.copy) {
904
905 debug_tcp("data_recv offset %d copy %d\n",
906 tcp_conn->in.offset, tcp_conn->in.copy);
907
908 rc = iscsi_data_recv(conn);
909 if (rc) {
910 if (rc == -EAGAIN)
911 goto again;
912 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
913 return 0;
914 }
915 tcp_conn->in.copy -= tcp_conn->in.padding;
916 tcp_conn->in.offset += tcp_conn->in.padding;
917 if (conn->datadgst_en) {
918 if (tcp_conn->in.padding) {
919 debug_tcp("padding -> %d\n",
920 tcp_conn->in.padding);
921 memset(pad, 0, tcp_conn->in.padding);
922 sg_init_one(&sg, pad, tcp_conn->in.padding);
923 crypto_digest_update(tcp_conn->data_rx_tfm,
924 &sg, 1);
925 }
926 crypto_digest_final(tcp_conn->data_rx_tfm,
927 (u8 *) & tcp_conn->in.datadgst);
928 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
929 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
930 } else
931 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
932 }
933
934 debug_tcp("f, processed %d from out of %d padding %d\n",
935 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
936 BUG_ON(tcp_conn->in.offset - offset > len);
937
938 if (tcp_conn->in.offset - offset != len) {
939 debug_tcp("continue to process %d bytes\n",
940 (int)len - (tcp_conn->in.offset - offset));
941 goto more;
942 }
943
944 nomore:
945 processed = tcp_conn->in.offset - offset;
946 BUG_ON(processed == 0);
947 return processed;
948
949 again:
950 processed = tcp_conn->in.offset - offset;
951 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
952 processed, (int)len, (int)rd_desc->count);
953 BUG_ON(processed == 0);
954 BUG_ON(processed > len);
955
956 conn->rxdata_octets += processed;
957 return processed;
958 }
959
960 static void
961 iscsi_tcp_data_ready(struct sock *sk, int flag)
962 {
963 struct iscsi_conn *conn = sk->sk_user_data;
964 read_descriptor_t rd_desc;
965
966 read_lock(&sk->sk_callback_lock);
967
968 /*
969 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
970 * We set count to 1 because we want the network layer to
971 * hand us all the skbs that are available. iscsi_tcp_data_recv
972 * handled pdus that cross buffers or pdus that still need data.
973 */
974 rd_desc.arg.data = conn;
975 rd_desc.count = 1;
976 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
977
978 read_unlock(&sk->sk_callback_lock);
979 }
980
981 static void
982 iscsi_tcp_state_change(struct sock *sk)
983 {
984 struct iscsi_tcp_conn *tcp_conn;
985 struct iscsi_conn *conn;
986 struct iscsi_session *session;
987 void (*old_state_change)(struct sock *);
988
989 read_lock(&sk->sk_callback_lock);
990
991 conn = (struct iscsi_conn*)sk->sk_user_data;
992 session = conn->session;
993
994 if ((sk->sk_state == TCP_CLOSE_WAIT ||
995 sk->sk_state == TCP_CLOSE) &&
996 !atomic_read(&sk->sk_rmem_alloc)) {
997 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
998 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
999 }
1000
1001 tcp_conn = conn->dd_data;
1002 old_state_change = tcp_conn->old_state_change;
1003
1004 read_unlock(&sk->sk_callback_lock);
1005
1006 old_state_change(sk);
1007 }
1008
1009 /**
1010 * iscsi_write_space - Called when more output buffer space is available
1011 * @sk: socket space is available for
1012 **/
1013 static void
1014 iscsi_write_space(struct sock *sk)
1015 {
1016 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1017 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1018
1019 tcp_conn->old_write_space(sk);
1020 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1021 scsi_queue_work(conn->session->host, &conn->xmitwork);
1022 }
1023
1024 static void
1025 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1026 {
1027 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1028 struct sock *sk = tcp_conn->sock->sk;
1029
1030 /* assign new callbacks */
1031 write_lock_bh(&sk->sk_callback_lock);
1032 sk->sk_user_data = conn;
1033 tcp_conn->old_data_ready = sk->sk_data_ready;
1034 tcp_conn->old_state_change = sk->sk_state_change;
1035 tcp_conn->old_write_space = sk->sk_write_space;
1036 sk->sk_data_ready = iscsi_tcp_data_ready;
1037 sk->sk_state_change = iscsi_tcp_state_change;
1038 sk->sk_write_space = iscsi_write_space;
1039 write_unlock_bh(&sk->sk_callback_lock);
1040 }
1041
1042 static void
1043 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1044 {
1045 struct sock *sk = tcp_conn->sock->sk;
1046
1047 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1048 write_lock_bh(&sk->sk_callback_lock);
1049 sk->sk_user_data = NULL;
1050 sk->sk_data_ready = tcp_conn->old_data_ready;
1051 sk->sk_state_change = tcp_conn->old_state_change;
1052 sk->sk_write_space = tcp_conn->old_write_space;
1053 sk->sk_no_check = 0;
1054 write_unlock_bh(&sk->sk_callback_lock);
1055 }
1056
1057 /**
1058 * iscsi_send - generic send routine
1059 * @sk: kernel's socket
1060 * @buf: buffer to write from
1061 * @size: actual size to write
1062 * @flags: socket's flags
1063 */
1064 static inline int
1065 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1066 {
1067 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1068 struct socket *sk = tcp_conn->sock;
1069 int offset = buf->sg.offset + buf->sent, res;
1070
1071 /*
1072 * if we got use_sg=0 or are sending something we kmallocd
1073 * then we did not have to do kmap (kmap returns page_address)
1074 *
1075 * if we got use_sg > 0, but had to drop down, we do not
1076 * set clustering so this should only happen for that
1077 * slab case.
1078 */
1079 if (buf->use_sendmsg)
1080 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1081 else
1082 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1083
1084 if (res >= 0) {
1085 conn->txdata_octets += res;
1086 buf->sent += res;
1087 return res;
1088 }
1089
1090 tcp_conn->sendpage_failures_cnt++;
1091 if (res == -EAGAIN)
1092 res = -ENOBUFS;
1093 else
1094 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1095 return res;
1096 }
1097
1098 /**
1099 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1100 * @conn: iscsi connection
1101 * @buf: buffer to write from
1102 * @datalen: lenght of data to be sent after the header
1103 *
1104 * Notes:
1105 * (Tx, Fast Path)
1106 **/
1107 static inline int
1108 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1109 {
1110 int flags = 0; /* MSG_DONTWAIT; */
1111 int res, size;
1112
1113 size = buf->sg.length - buf->sent;
1114 BUG_ON(buf->sent + size > buf->sg.length);
1115 if (buf->sent + size != buf->sg.length || datalen)
1116 flags |= MSG_MORE;
1117
1118 res = iscsi_send(conn, buf, size, flags);
1119 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1120 if (res >= 0) {
1121 if (size != res)
1122 return -EAGAIN;
1123 return 0;
1124 }
1125
1126 return res;
1127 }
1128
1129 /**
1130 * iscsi_sendpage - send one page of iSCSI Data-Out.
1131 * @conn: iscsi connection
1132 * @buf: buffer to write from
1133 * @count: remaining data
1134 * @sent: number of bytes sent
1135 *
1136 * Notes:
1137 * (Tx, Fast Path)
1138 **/
1139 static inline int
1140 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1141 int *count, int *sent)
1142 {
1143 int flags = 0; /* MSG_DONTWAIT; */
1144 int res, size;
1145
1146 size = buf->sg.length - buf->sent;
1147 BUG_ON(buf->sent + size > buf->sg.length);
1148 if (size > *count)
1149 size = *count;
1150 if (buf->sent + size != buf->sg.length || *count != size)
1151 flags |= MSG_MORE;
1152
1153 res = iscsi_send(conn, buf, size, flags);
1154 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1155 size, buf->sent, *count, *sent, res);
1156 if (res >= 0) {
1157 *count -= res;
1158 *sent += res;
1159 if (size != res)
1160 return -EAGAIN;
1161 return 0;
1162 }
1163
1164 return res;
1165 }
1166
1167 static inline void
1168 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1169 struct iscsi_cmd_task *ctask)
1170 {
1171 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1172
1173 BUG_ON(!tcp_conn->data_tx_tfm);
1174 crypto_digest_init(tcp_conn->data_tx_tfm);
1175 tcp_ctask->digest_count = 4;
1176 }
1177
1178 static int
1179 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1180 struct iscsi_buf *buf, uint32_t *digest, int final)
1181 {
1182 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1183 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1184 int rc = 0;
1185 int sent = 0;
1186
1187 if (final)
1188 crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest);
1189
1190 iscsi_buf_init_iov(buf, (char*)digest, 4);
1191 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1192 if (rc) {
1193 tcp_ctask->datadigest = *digest;
1194 tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
1195 } else
1196 tcp_ctask->digest_count = 4;
1197 return rc;
1198 }
1199
1200 /**
1201 * iscsi_solicit_data_cont - initialize next Data-Out
1202 * @conn: iscsi connection
1203 * @ctask: scsi command task
1204 * @r2t: R2T info
1205 * @left: bytes left to transfer
1206 *
1207 * Notes:
1208 * Initialize next Data-Out within this R2T sequence and continue
1209 * to process next Scatter-Gather element(if any) of this SCSI command.
1210 *
1211 * Called under connection lock.
1212 **/
1213 static void
1214 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1215 struct iscsi_r2t_info *r2t, int left)
1216 {
1217 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1218 struct iscsi_data *hdr;
1219 struct scsi_cmnd *sc = ctask->sc;
1220 int new_offset;
1221
1222 hdr = &r2t->dtask.hdr;
1223 memset(hdr, 0, sizeof(struct iscsi_data));
1224 hdr->ttt = r2t->ttt;
1225 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1226 r2t->solicit_datasn++;
1227 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1228 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1229 hdr->itt = ctask->hdr->itt;
1230 hdr->exp_statsn = r2t->exp_statsn;
1231 new_offset = r2t->data_offset + r2t->sent;
1232 hdr->offset = cpu_to_be32(new_offset);
1233 if (left > conn->max_xmit_dlength) {
1234 hton24(hdr->dlength, conn->max_xmit_dlength);
1235 r2t->data_count = conn->max_xmit_dlength;
1236 } else {
1237 hton24(hdr->dlength, left);
1238 r2t->data_count = left;
1239 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1240 }
1241 conn->dataout_pdus_cnt++;
1242
1243 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1244 sizeof(struct iscsi_hdr));
1245
1246 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1247 BUG_ON(tcp_ctask->bad_sg == r2t->sg);
1248 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1249 r2t->sg += 1;
1250 } else
1251 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1252 (char*)sc->request_buffer + new_offset,
1253 r2t->data_count);
1254 }
1255
1256 static void
1257 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1258 {
1259 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1260 struct iscsi_data_task *dtask;
1261
1262 dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask;
1263 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr,
1264 tcp_ctask->r2t_data_count);
1265 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1266 sizeof(struct iscsi_hdr));
1267 }
1268
1269 /**
1270 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1271 * @conn: iscsi connection
1272 * @ctask: scsi command task
1273 * @sc: scsi command
1274 **/
1275 static void
1276 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1277 {
1278 struct scsi_cmnd *sc = ctask->sc;
1279 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1280
1281 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1282
1283 tcp_ctask->sent = 0;
1284 tcp_ctask->sg_count = 0;
1285
1286 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1287 tcp_ctask->xmstate = XMSTATE_W_HDR;
1288 tcp_ctask->exp_r2tsn = 0;
1289 BUG_ON(ctask->total_length == 0);
1290
1291 if (sc->use_sg) {
1292 struct scatterlist *sg = sc->request_buffer;
1293
1294 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1295 &sg[tcp_ctask->sg_count++]);
1296 tcp_ctask->sg = sg;
1297 tcp_ctask->bad_sg = sg + sc->use_sg;
1298 } else
1299 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1300 sc->request_buffer,
1301 sc->request_bufflen);
1302
1303 if (ctask->imm_count)
1304 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1305
1306 tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1307 if (tcp_ctask->pad_count) {
1308 tcp_ctask->pad_count = ISCSI_PAD_LEN -
1309 tcp_ctask->pad_count;
1310 debug_scsi("write padding %d bytes\n",
1311 tcp_ctask->pad_count);
1312 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1313 }
1314
1315 if (ctask->unsol_count)
1316 tcp_ctask->xmstate |= XMSTATE_UNS_HDR |
1317 XMSTATE_UNS_INIT;
1318 tcp_ctask->r2t_data_count = ctask->total_length -
1319 ctask->imm_count -
1320 ctask->unsol_count;
1321
1322 debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d "
1323 "r2t_data %d]\n",
1324 ctask->itt, ctask->total_length, ctask->imm_count,
1325 ctask->unsol_count, tcp_ctask->r2t_data_count);
1326 } else
1327 tcp_ctask->xmstate = XMSTATE_R_HDR;
1328
1329 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1330 sizeof(struct iscsi_hdr));
1331 }
1332
1333 /**
1334 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1335 * @conn: iscsi connection
1336 * @mtask: task management task
1337 *
1338 * Notes:
1339 * The function can return -EAGAIN in which case caller must
1340 * call it again later, or recover. '0' return code means successful
1341 * xmit.
1342 *
1343 * Management xmit state machine consists of two states:
1344 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1345 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1346 **/
1347 static int
1348 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1349 {
1350 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1351 int rc;
1352
1353 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1354 conn->id, tcp_mtask->xmstate, mtask->itt);
1355
1356 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1357 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
1358 if (mtask->data_count)
1359 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1360 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1361 conn->stop_stage != STOP_CONN_RECOVER &&
1362 conn->hdrdgst_en)
1363 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1364 (u8*)tcp_mtask->hdrext);
1365 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1366 mtask->data_count);
1367 if (rc) {
1368 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1369 if (mtask->data_count)
1370 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1371 return rc;
1372 }
1373 }
1374
1375 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
1376 BUG_ON(!mtask->data_count);
1377 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1378 /* FIXME: implement.
1379 * Virtual buffer could be spreaded across multiple pages...
1380 */
1381 do {
1382 int rc;
1383
1384 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1385 &mtask->data_count, &tcp_mtask->sent);
1386 if (rc) {
1387 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1388 return rc;
1389 }
1390 } while (mtask->data_count);
1391 }
1392
1393 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1394 if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1395 struct iscsi_session *session = conn->session;
1396
1397 spin_lock_bh(&session->lock);
1398 list_del(&conn->mtask->running);
1399 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1400 sizeof(void*));
1401 spin_unlock_bh(&session->lock);
1402 }
1403 return 0;
1404 }
1405
1406 static inline int
1407 handle_xmstate_r_hdr(struct iscsi_conn *conn,
1408 struct iscsi_tcp_cmd_task *tcp_ctask)
1409 {
1410 int rc;
1411
1412 tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
1413 if (conn->hdrdgst_en)
1414 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1415 (u8*)tcp_ctask->hdrext);
1416 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
1417 if (!rc) {
1418 BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
1419 return 0; /* wait for Data-In */
1420 }
1421 tcp_ctask->xmstate |= XMSTATE_R_HDR;
1422 return rc;
1423 }
1424
1425 static inline int
1426 handle_xmstate_w_hdr(struct iscsi_conn *conn,
1427 struct iscsi_cmd_task *ctask)
1428 {
1429 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1430 int rc;
1431
1432 tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
1433 if (conn->hdrdgst_en)
1434 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1435 (u8*)tcp_ctask->hdrext);
1436 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1437 if (rc)
1438 tcp_ctask->xmstate |= XMSTATE_W_HDR;
1439 return rc;
1440 }
1441
1442 static inline int
1443 handle_xmstate_data_digest(struct iscsi_conn *conn,
1444 struct iscsi_cmd_task *ctask)
1445 {
1446 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1447 int rc;
1448
1449 tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1450 debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest);
1451 rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
1452 &tcp_ctask->datadigest, 0);
1453 if (rc) {
1454 tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
1455 debug_tcp("resent data digest 0x%x fail!\n",
1456 tcp_ctask->datadigest);
1457 }
1458
1459 return rc;
1460 }
1461
1462 static inline int
1463 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1464 {
1465 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1466 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1467 int rc;
1468
1469 BUG_ON(!ctask->imm_count);
1470 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1471
1472 if (conn->datadgst_en) {
1473 iscsi_data_digest_init(tcp_conn, ctask);
1474 tcp_ctask->immdigest = 0;
1475 }
1476
1477 for (;;) {
1478 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
1479 &ctask->imm_count, &tcp_ctask->sent);
1480 if (rc) {
1481 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1482 if (conn->datadgst_en) {
1483 crypto_digest_final(tcp_conn->data_tx_tfm,
1484 (u8*)&tcp_ctask->immdigest);
1485 debug_tcp("tx imm sendpage fail 0x%x\n",
1486 tcp_ctask->datadigest);
1487 }
1488 return rc;
1489 }
1490 if (conn->datadgst_en)
1491 crypto_digest_update(tcp_conn->data_tx_tfm,
1492 &tcp_ctask->sendbuf.sg, 1);
1493
1494 if (!ctask->imm_count)
1495 break;
1496 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1497 &tcp_ctask->sg[tcp_ctask->sg_count++]);
1498 }
1499
1500 if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
1501 rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
1502 &tcp_ctask->immdigest, 1);
1503 if (rc) {
1504 debug_tcp("sending imm digest 0x%x fail!\n",
1505 tcp_ctask->immdigest);
1506 return rc;
1507 }
1508 debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest);
1509 }
1510
1511 return 0;
1512 }
1513
1514 static inline int
1515 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1516 {
1517 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1518 struct iscsi_data_task *dtask;
1519 int rc;
1520
1521 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1522 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1523 iscsi_unsolicit_data_init(conn, ctask);
1524 dtask = tcp_ctask->dtask;
1525 if (conn->hdrdgst_en)
1526 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1527 (u8*)dtask->hdrext);
1528 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1529 }
1530
1531 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1532 if (rc) {
1533 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1534 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1535 return rc;
1536 }
1537
1538 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1539 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1540 return 0;
1541 }
1542
1543 static inline int
1544 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1545 {
1546 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1547 struct iscsi_data_task *dtask = tcp_ctask->dtask;
1548 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1549 int rc;
1550
1551 BUG_ON(!ctask->data_count);
1552 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1553
1554 if (conn->datadgst_en) {
1555 iscsi_data_digest_init(tcp_conn, ctask);
1556 dtask->digest = 0;
1557 }
1558
1559 for (;;) {
1560 int start = tcp_ctask->sent;
1561
1562 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
1563 &ctask->data_count, &tcp_ctask->sent);
1564 if (rc) {
1565 ctask->unsol_count -= tcp_ctask->sent - start;
1566 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1567 /* will continue with this ctask later.. */
1568 if (conn->datadgst_en) {
1569 crypto_digest_final(tcp_conn->data_tx_tfm,
1570 (u8 *)&dtask->digest);
1571 debug_tcp("tx uns data fail 0x%x\n",
1572 dtask->digest);
1573 }
1574 return rc;
1575 }
1576
1577 BUG_ON(tcp_ctask->sent > ctask->total_length);
1578 ctask->unsol_count -= tcp_ctask->sent - start;
1579
1580 /*
1581 * XXX:we may run here with un-initial sendbuf.
1582 * so pass it
1583 */
1584 if (conn->datadgst_en && tcp_ctask->sent - start > 0)
1585 crypto_digest_update(tcp_conn->data_tx_tfm,
1586 &tcp_ctask->sendbuf.sg, 1);
1587
1588 if (!ctask->data_count)
1589 break;
1590 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1591 &tcp_ctask->sg[tcp_ctask->sg_count++]);
1592 }
1593 BUG_ON(ctask->unsol_count < 0);
1594
1595 /*
1596 * Done with the Data-Out. Next, check if we need
1597 * to send another unsolicited Data-Out.
1598 */
1599 if (ctask->unsol_count) {
1600 if (conn->datadgst_en) {
1601 rc = iscsi_digest_final_send(conn, ctask,
1602 &dtask->digestbuf,
1603 &dtask->digest, 1);
1604 if (rc) {
1605 debug_tcp("send uns digest 0x%x fail\n",
1606 dtask->digest);
1607 return rc;
1608 }
1609 debug_tcp("sending uns digest 0x%x, more uns\n",
1610 dtask->digest);
1611 }
1612 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1613 return 1;
1614 }
1615
1616 if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
1617 rc = iscsi_digest_final_send(conn, ctask,
1618 &dtask->digestbuf,
1619 &dtask->digest, 1);
1620 if (rc) {
1621 debug_tcp("send last uns digest 0x%x fail\n",
1622 dtask->digest);
1623 return rc;
1624 }
1625 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1626 }
1627
1628 return 0;
1629 }
1630
1631 static inline int
1632 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1633 {
1634 struct iscsi_session *session = conn->session;
1635 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1636 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1637 struct iscsi_r2t_info *r2t = tcp_ctask->r2t;
1638 struct iscsi_data_task *dtask = &r2t->dtask;
1639 int left, rc;
1640
1641 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1642 tcp_ctask->dtask = dtask;
1643
1644 if (conn->datadgst_en) {
1645 iscsi_data_digest_init(tcp_conn, ctask);
1646 dtask->digest = 0;
1647 }
1648 solicit_again:
1649 /*
1650 * send Data-Out within this R2T sequence.
1651 */
1652 if (!r2t->data_count)
1653 goto data_out_done;
1654
1655 rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent);
1656 if (rc) {
1657 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1658 /* will continue with this ctask later.. */
1659 if (conn->datadgst_en) {
1660 crypto_digest_final(tcp_conn->data_tx_tfm,
1661 (u8 *)&dtask->digest);
1662 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1663 }
1664 return rc;
1665 }
1666
1667 BUG_ON(r2t->data_count < 0);
1668 if (conn->datadgst_en)
1669 crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg,
1670 1);
1671
1672 if (r2t->data_count) {
1673 BUG_ON(ctask->sc->use_sg == 0);
1674 if (!iscsi_buf_left(&r2t->sendbuf)) {
1675 BUG_ON(tcp_ctask->bad_sg == r2t->sg);
1676 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1677 r2t->sg += 1;
1678 }
1679 goto solicit_again;
1680 }
1681
1682 data_out_done:
1683 /*
1684 * Done with this Data-Out. Next, check if we have
1685 * to send another Data-Out for this R2T.
1686 */
1687 BUG_ON(r2t->data_length - r2t->sent < 0);
1688 left = r2t->data_length - r2t->sent;
1689 if (left) {
1690 if (conn->datadgst_en) {
1691 rc = iscsi_digest_final_send(conn, ctask,
1692 &dtask->digestbuf,
1693 &dtask->digest, 1);
1694 if (rc) {
1695 debug_tcp("send r2t data digest 0x%x"
1696 "fail\n", dtask->digest);
1697 return rc;
1698 }
1699 debug_tcp("r2t data send digest 0x%x\n",
1700 dtask->digest);
1701 }
1702 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1703 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1704 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1705 return 1;
1706 }
1707
1708 /*
1709 * Done with this R2T. Check if there are more
1710 * outstanding R2Ts ready to be processed.
1711 */
1712 BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0);
1713 if (conn->datadgst_en) {
1714 rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
1715 &dtask->digest, 1);
1716 if (rc) {
1717 debug_tcp("send last r2t data digest 0x%x"
1718 "fail\n", dtask->digest);
1719 return rc;
1720 }
1721 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
1722 }
1723
1724 tcp_ctask->r2t_data_count -= r2t->data_length;
1725 tcp_ctask->r2t = NULL;
1726 spin_lock_bh(&session->lock);
1727 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
1728 spin_unlock_bh(&session->lock);
1729 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
1730 tcp_ctask->r2t = r2t;
1731 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1732 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1733 return 1;
1734 }
1735
1736 return 0;
1737 }
1738
1739 static inline int
1740 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1741 {
1742 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1743 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1744 struct iscsi_data_task *dtask = tcp_ctask->dtask;
1745 int sent = 0, rc;
1746
1747 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1748 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1749 tcp_ctask->pad_count);
1750 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1751 &sent);
1752 if (rc) {
1753 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1754 return rc;
1755 }
1756
1757 if (conn->datadgst_en) {
1758 crypto_digest_update(tcp_conn->data_tx_tfm,
1759 &tcp_ctask->sendbuf.sg, 1);
1760 /* imm data? */
1761 if (!dtask) {
1762 rc = iscsi_digest_final_send(conn, ctask,
1763 &tcp_ctask->immbuf,
1764 &tcp_ctask->immdigest, 1);
1765 if (rc) {
1766 debug_tcp("send padding digest 0x%x"
1767 "fail!\n", tcp_ctask->immdigest);
1768 return rc;
1769 }
1770 debug_tcp("done with padding, digest 0x%x\n",
1771 tcp_ctask->datadigest);
1772 } else {
1773 rc = iscsi_digest_final_send(conn, ctask,
1774 &dtask->digestbuf,
1775 &dtask->digest, 1);
1776 if (rc) {
1777 debug_tcp("send padding digest 0x%x"
1778 "fail\n", dtask->digest);
1779 return rc;
1780 }
1781 debug_tcp("done with padding, digest 0x%x\n",
1782 dtask->digest);
1783 }
1784 }
1785
1786 return 0;
1787 }
1788
1789 static int
1790 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1791 {
1792 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1793 int rc = 0;
1794
1795 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1796 conn->id, tcp_ctask->xmstate, ctask->itt);
1797
1798 /*
1799 * serialize with TMF AbortTask
1800 */
1801 if (ctask->mtask)
1802 return rc;
1803
1804 if (tcp_ctask->xmstate & XMSTATE_R_HDR)
1805 return handle_xmstate_r_hdr(conn, tcp_ctask);
1806
1807 if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
1808 rc = handle_xmstate_w_hdr(conn, ctask);
1809 if (rc)
1810 return rc;
1811 }
1812
1813 /* XXX: for data digest xmit recover */
1814 if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) {
1815 rc = handle_xmstate_data_digest(conn, ctask);
1816 if (rc)
1817 return rc;
1818 }
1819
1820 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1821 rc = handle_xmstate_imm_data(conn, ctask);
1822 if (rc)
1823 return rc;
1824 }
1825
1826 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1827 BUG_ON(!ctask->unsol_count);
1828 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1829 unsolicit_head_again:
1830 rc = handle_xmstate_uns_hdr(conn, ctask);
1831 if (rc)
1832 return rc;
1833 }
1834
1835 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1836 rc = handle_xmstate_uns_data(conn, ctask);
1837 if (rc == 1)
1838 goto unsolicit_head_again;
1839 else if (rc)
1840 return rc;
1841 goto done;
1842 }
1843
1844 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1845 struct iscsi_r2t_info *r2t;
1846
1847 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1848 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1849 if (!tcp_ctask->r2t)
1850 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1851 sizeof(void*));
1852 solicit_head_again:
1853 r2t = tcp_ctask->r2t;
1854 if (conn->hdrdgst_en)
1855 iscsi_hdr_digest(conn, &r2t->headbuf,
1856 (u8*)r2t->dtask.hdrext);
1857 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1858 if (rc) {
1859 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1860 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1861 return rc;
1862 }
1863
1864 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1865 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1866 r2t->sent);
1867 }
1868
1869 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1870 rc = handle_xmstate_sol_data(conn, ctask);
1871 if (rc == 1)
1872 goto solicit_head_again;
1873 if (rc)
1874 return rc;
1875 }
1876
1877 done:
1878 /*
1879 * Last thing to check is whether we need to send write
1880 * padding. Note that we check for xmstate equality, not just the bit.
1881 */
1882 if (tcp_ctask->xmstate == XMSTATE_W_PAD)
1883 rc = handle_xmstate_w_pad(conn, ctask);
1884
1885 return rc;
1886 }
1887
1888 static struct iscsi_cls_conn *
1889 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1890 {
1891 struct iscsi_conn *conn;
1892 struct iscsi_cls_conn *cls_conn;
1893 struct iscsi_tcp_conn *tcp_conn;
1894
1895 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1896 if (!cls_conn)
1897 return NULL;
1898 conn = cls_conn->dd_data;
1899 /*
1900 * due to strange issues with iser these are not set
1901 * in iscsi_conn_setup
1902 */
1903 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
1904
1905 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1906 if (!tcp_conn)
1907 goto tcp_conn_alloc_fail;
1908
1909 conn->dd_data = tcp_conn;
1910 tcp_conn->iscsi_conn = conn;
1911 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1912 /* initial operational parameters */
1913 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1914 tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
1915
1916 /* allocate initial PDU receive place holder */
1917 if (tcp_conn->data_size <= PAGE_SIZE)
1918 tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL);
1919 else
1920 tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL,
1921 get_order(tcp_conn->data_size));
1922 if (!tcp_conn->data)
1923 goto max_recv_dlenght_alloc_fail;
1924
1925 return cls_conn;
1926
1927 max_recv_dlenght_alloc_fail:
1928 kfree(tcp_conn);
1929 tcp_conn_alloc_fail:
1930 iscsi_conn_teardown(cls_conn);
1931 return NULL;
1932 }
1933
1934 static void
1935 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1936 {
1937 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1938
1939 if (!tcp_conn->sock)
1940 return;
1941
1942 sock_hold(tcp_conn->sock->sk);
1943 iscsi_conn_restore_callbacks(tcp_conn);
1944 sock_put(tcp_conn->sock->sk);
1945
1946 sock_release(tcp_conn->sock);
1947 tcp_conn->sock = NULL;
1948 conn->recv_lock = NULL;
1949 }
1950
1951 static void
1952 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1953 {
1954 struct iscsi_conn *conn = cls_conn->dd_data;
1955 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1956 int digest = 0;
1957
1958 if (conn->hdrdgst_en || conn->datadgst_en)
1959 digest = 1;
1960
1961 iscsi_tcp_release_conn(conn);
1962 iscsi_conn_teardown(cls_conn);
1963
1964 /* now free tcp_conn */
1965 if (digest) {
1966 if (tcp_conn->tx_tfm)
1967 crypto_free_tfm(tcp_conn->tx_tfm);
1968 if (tcp_conn->rx_tfm)
1969 crypto_free_tfm(tcp_conn->rx_tfm);
1970 if (tcp_conn->data_tx_tfm)
1971 crypto_free_tfm(tcp_conn->data_tx_tfm);
1972 if (tcp_conn->data_rx_tfm)
1973 crypto_free_tfm(tcp_conn->data_rx_tfm);
1974 }
1975
1976 /* free conn->data, size = MaxRecvDataSegmentLength */
1977 if (tcp_conn->data_size <= PAGE_SIZE)
1978 kfree(tcp_conn->data);
1979 else
1980 free_pages((unsigned long)tcp_conn->data,
1981 get_order(tcp_conn->data_size));
1982 kfree(tcp_conn);
1983 }
1984
1985 static void
1986 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1987 {
1988 struct iscsi_conn *conn = cls_conn->dd_data;
1989
1990 iscsi_conn_stop(cls_conn, flag);
1991 iscsi_tcp_release_conn(conn);
1992 }
1993
1994 static int
1995 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1996 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1997 int is_leading)
1998 {
1999 struct iscsi_conn *conn = cls_conn->dd_data;
2000 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2001 struct sock *sk;
2002 struct socket *sock;
2003 int err;
2004
2005 /* lookup for existing socket */
2006 sock = sockfd_lookup((int)transport_eph, &err);
2007 if (!sock) {
2008 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2009 return -EEXIST;
2010 }
2011
2012 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2013 if (err)
2014 return err;
2015
2016 /* bind iSCSI connection and socket */
2017 tcp_conn->sock = sock;
2018
2019 /* setup Socket parameters */
2020 sk = sock->sk;
2021 sk->sk_reuse = 1;
2022 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2023 sk->sk_allocation = GFP_ATOMIC;
2024
2025 /* FIXME: disable Nagle's algorithm */
2026
2027 /*
2028 * Intercept TCP callbacks for sendfile like receive
2029 * processing.
2030 */
2031 conn->recv_lock = &sk->sk_callback_lock;
2032 iscsi_conn_set_callbacks(conn);
2033 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
2034 /*
2035 * set receive state machine into initial state
2036 */
2037 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2038
2039 return 0;
2040 }
2041
2042 /* called with host lock */
2043 static void
2044 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
2045 char *data, uint32_t data_size)
2046 {
2047 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2048
2049 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
2050 sizeof(struct iscsi_hdr));
2051 tcp_mtask->xmstate = XMSTATE_IMM_HDR;
2052 tcp_mtask->sent = 0;
2053
2054 if (mtask->data_count)
2055 iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
2056 mtask->data_count);
2057 }
2058
2059 static int
2060 iscsi_r2tpool_alloc(struct iscsi_session *session)
2061 {
2062 int i;
2063 int cmd_i;
2064
2065 /*
2066 * initialize per-task: R2T pool and xmit queue
2067 */
2068 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2069 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2070 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2071
2072 /*
2073 * pre-allocated x4 as much r2ts to handle race when
2074 * target acks DataOut faster than we data_xmit() queues
2075 * could replenish r2tqueue.
2076 */
2077
2078 /* R2T pool */
2079 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
2080 (void***)&tcp_ctask->r2ts,
2081 sizeof(struct iscsi_r2t_info))) {
2082 goto r2t_alloc_fail;
2083 }
2084
2085 /* R2T xmit queue */
2086 tcp_ctask->r2tqueue = kfifo_alloc(
2087 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
2088 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
2089 iscsi_pool_free(&tcp_ctask->r2tpool,
2090 (void**)tcp_ctask->r2ts);
2091 goto r2t_alloc_fail;
2092 }
2093 }
2094
2095 return 0;
2096
2097 r2t_alloc_fail:
2098 for (i = 0; i < cmd_i; i++) {
2099 struct iscsi_cmd_task *ctask = session->cmds[i];
2100 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2101
2102 kfifo_free(tcp_ctask->r2tqueue);
2103 iscsi_pool_free(&tcp_ctask->r2tpool,
2104 (void**)tcp_ctask->r2ts);
2105 }
2106 return -ENOMEM;
2107 }
2108
2109 static void
2110 iscsi_r2tpool_free(struct iscsi_session *session)
2111 {
2112 int i;
2113
2114 for (i = 0; i < session->cmds_max; i++) {
2115 struct iscsi_cmd_task *ctask = session->cmds[i];
2116 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2117
2118 kfifo_free(tcp_ctask->r2tqueue);
2119 iscsi_pool_free(&tcp_ctask->r2tpool,
2120 (void**)tcp_ctask->r2ts);
2121 }
2122 }
2123
2124 static int
2125 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
2126 char *buf, int buflen)
2127 {
2128 struct iscsi_conn *conn = cls_conn->dd_data;
2129 struct iscsi_session *session = conn->session;
2130 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2131 int value;
2132
2133 switch(param) {
2134 case ISCSI_PARAM_MAX_RECV_DLENGTH: {
2135 char *saveptr = tcp_conn->data;
2136 gfp_t flags = GFP_KERNEL;
2137
2138 sscanf(buf, "%d", &value);
2139 if (tcp_conn->data_size >= value) {
2140 iscsi_set_param(cls_conn, param, buf, buflen);
2141 break;
2142 }
2143
2144 spin_lock_bh(&session->lock);
2145 if (conn->stop_stage == STOP_CONN_RECOVER)
2146 flags = GFP_ATOMIC;
2147 spin_unlock_bh(&session->lock);
2148
2149 if (value <= PAGE_SIZE)
2150 tcp_conn->data = kmalloc(value, flags);
2151 else
2152 tcp_conn->data = (void*)__get_free_pages(flags,
2153 get_order(value));
2154 if (tcp_conn->data == NULL) {
2155 tcp_conn->data = saveptr;
2156 return -ENOMEM;
2157 }
2158 if (tcp_conn->data_size <= PAGE_SIZE)
2159 kfree(saveptr);
2160 else
2161 free_pages((unsigned long)saveptr,
2162 get_order(tcp_conn->data_size));
2163 iscsi_set_param(cls_conn, param, buf, buflen);
2164 tcp_conn->data_size = value;
2165 break;
2166 }
2167 case ISCSI_PARAM_HDRDGST_EN:
2168 iscsi_set_param(cls_conn, param, buf, buflen);
2169 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
2170 if (conn->hdrdgst_en) {
2171 tcp_conn->hdr_size += sizeof(__u32);
2172 if (!tcp_conn->tx_tfm)
2173 tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c",
2174 0);
2175 if (!tcp_conn->tx_tfm)
2176 return -ENOMEM;
2177 if (!tcp_conn->rx_tfm)
2178 tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c",
2179 0);
2180 if (!tcp_conn->rx_tfm) {
2181 crypto_free_tfm(tcp_conn->tx_tfm);
2182 return -ENOMEM;
2183 }
2184 } else {
2185 if (tcp_conn->tx_tfm)
2186 crypto_free_tfm(tcp_conn->tx_tfm);
2187 if (tcp_conn->rx_tfm)
2188 crypto_free_tfm(tcp_conn->rx_tfm);
2189 }
2190 break;
2191 case ISCSI_PARAM_DATADGST_EN:
2192 iscsi_set_param(cls_conn, param, buf, buflen);
2193 if (conn->datadgst_en) {
2194 if (!tcp_conn->data_tx_tfm)
2195 tcp_conn->data_tx_tfm =
2196 crypto_alloc_tfm("crc32c", 0);
2197 if (!tcp_conn->data_tx_tfm)
2198 return -ENOMEM;
2199 if (!tcp_conn->data_rx_tfm)
2200 tcp_conn->data_rx_tfm =
2201 crypto_alloc_tfm("crc32c", 0);
2202 if (!tcp_conn->data_rx_tfm) {
2203 crypto_free_tfm(tcp_conn->data_tx_tfm);
2204 return -ENOMEM;
2205 }
2206 } else {
2207 if (tcp_conn->data_tx_tfm)
2208 crypto_free_tfm(tcp_conn->data_tx_tfm);
2209 if (tcp_conn->data_rx_tfm)
2210 crypto_free_tfm(tcp_conn->data_rx_tfm);
2211 }
2212 tcp_conn->sendpage = conn->datadgst_en ?
2213 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2214 break;
2215 case ISCSI_PARAM_MAX_R2T:
2216 sscanf(buf, "%d", &value);
2217 if (session->max_r2t == roundup_pow_of_two(value))
2218 break;
2219 iscsi_r2tpool_free(session);
2220 iscsi_set_param(cls_conn, param, buf, buflen);
2221 if (session->max_r2t & (session->max_r2t - 1))
2222 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2223 if (iscsi_r2tpool_alloc(session))
2224 return -ENOMEM;
2225 break;
2226 default:
2227 return iscsi_set_param(cls_conn, param, buf, buflen);
2228 }
2229
2230 return 0;
2231 }
2232
2233 static int
2234 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2235 enum iscsi_param param, char *buf)
2236 {
2237 struct iscsi_conn *conn = cls_conn->dd_data;
2238 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2239 struct inet_sock *inet;
2240 struct ipv6_pinfo *np;
2241 struct sock *sk;
2242 int len;
2243
2244 switch(param) {
2245 case ISCSI_PARAM_CONN_PORT:
2246 mutex_lock(&conn->xmitmutex);
2247 if (!tcp_conn->sock) {
2248 mutex_unlock(&conn->xmitmutex);
2249 return -EINVAL;
2250 }
2251
2252 inet = inet_sk(tcp_conn->sock->sk);
2253 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
2254 mutex_unlock(&conn->xmitmutex);
2255 break;
2256 case ISCSI_PARAM_CONN_ADDRESS:
2257 mutex_lock(&conn->xmitmutex);
2258 if (!tcp_conn->sock) {
2259 mutex_unlock(&conn->xmitmutex);
2260 return -EINVAL;
2261 }
2262
2263 sk = tcp_conn->sock->sk;
2264 if (sk->sk_family == PF_INET) {
2265 inet = inet_sk(sk);
2266 len = sprintf(buf, "%u.%u.%u.%u\n",
2267 NIPQUAD(inet->daddr));
2268 } else {
2269 np = inet6_sk(sk);
2270 len = sprintf(buf,
2271 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
2272 NIP6(np->daddr));
2273 }
2274 mutex_unlock(&conn->xmitmutex);
2275 break;
2276 default:
2277 return iscsi_conn_get_param(cls_conn, param, buf);
2278 }
2279
2280 return len;
2281 }
2282
2283 static void
2284 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2285 {
2286 struct iscsi_conn *conn = cls_conn->dd_data;
2287 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2288
2289 stats->txdata_octets = conn->txdata_octets;
2290 stats->rxdata_octets = conn->rxdata_octets;
2291 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2292 stats->dataout_pdus = conn->dataout_pdus_cnt;
2293 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2294 stats->datain_pdus = conn->datain_pdus_cnt;
2295 stats->r2t_pdus = conn->r2t_pdus_cnt;
2296 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2297 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2298 stats->custom_length = 3;
2299 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2300 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2301 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2302 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2303 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2304 stats->custom[2].value = conn->eh_abort_cnt;
2305 }
2306
2307 static struct iscsi_cls_session *
2308 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2309 struct scsi_transport_template *scsit,
2310 uint32_t initial_cmdsn, uint32_t *hostno)
2311 {
2312 struct iscsi_cls_session *cls_session;
2313 struct iscsi_session *session;
2314 uint32_t hn;
2315 int cmd_i;
2316
2317 cls_session = iscsi_session_setup(iscsit, scsit,
2318 sizeof(struct iscsi_tcp_cmd_task),
2319 sizeof(struct iscsi_tcp_mgmt_task),
2320 initial_cmdsn, &hn);
2321 if (!cls_session)
2322 return NULL;
2323 *hostno = hn;
2324
2325 session = class_to_transport_session(cls_session);
2326 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2327 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2328 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2329
2330 ctask->hdr = &tcp_ctask->hdr;
2331 }
2332
2333 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2334 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2335 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2336
2337 mtask->hdr = &tcp_mtask->hdr;
2338 }
2339
2340 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2341 goto r2tpool_alloc_fail;
2342
2343 return cls_session;
2344
2345 r2tpool_alloc_fail:
2346 iscsi_session_teardown(cls_session);
2347 return NULL;
2348 }
2349
2350 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2351 {
2352 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2353 iscsi_session_teardown(cls_session);
2354 }
2355
2356 static struct scsi_host_template iscsi_sht = {
2357 .name = "iSCSI Initiator over TCP/IP, v"
2358 ISCSI_TCP_VERSION,
2359 .queuecommand = iscsi_queuecommand,
2360 .change_queue_depth = iscsi_change_queue_depth,
2361 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
2362 .sg_tablesize = ISCSI_SG_TABLESIZE,
2363 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2364 .eh_abort_handler = iscsi_eh_abort,
2365 .eh_host_reset_handler = iscsi_eh_host_reset,
2366 .use_clustering = DISABLE_CLUSTERING,
2367 .proc_name = "iscsi_tcp",
2368 .this_id = -1,
2369 };
2370
2371 static struct iscsi_transport iscsi_tcp_transport = {
2372 .owner = THIS_MODULE,
2373 .name = "tcp",
2374 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2375 | CAP_DATADGST,
2376 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2377 ISCSI_MAX_XMIT_DLENGTH |
2378 ISCSI_HDRDGST_EN |
2379 ISCSI_DATADGST_EN |
2380 ISCSI_INITIAL_R2T_EN |
2381 ISCSI_MAX_R2T |
2382 ISCSI_IMM_DATA_EN |
2383 ISCSI_FIRST_BURST |
2384 ISCSI_MAX_BURST |
2385 ISCSI_PDU_INORDER_EN |
2386 ISCSI_DATASEQ_INORDER_EN |
2387 ISCSI_ERL |
2388 ISCSI_CONN_PORT |
2389 ISCSI_CONN_ADDRESS |
2390 ISCSI_EXP_STATSN |
2391 ISCSI_PERSISTENT_PORT |
2392 ISCSI_PERSISTENT_ADDRESS |
2393 ISCSI_TARGET_NAME |
2394 ISCSI_TPGT,
2395 .host_template = &iscsi_sht,
2396 .conndata_size = sizeof(struct iscsi_conn),
2397 .max_conn = 1,
2398 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2399 /* session management */
2400 .create_session = iscsi_tcp_session_create,
2401 .destroy_session = iscsi_tcp_session_destroy,
2402 /* connection management */
2403 .create_conn = iscsi_tcp_conn_create,
2404 .bind_conn = iscsi_tcp_conn_bind,
2405 .destroy_conn = iscsi_tcp_conn_destroy,
2406 .set_param = iscsi_conn_set_param,
2407 .get_conn_param = iscsi_tcp_conn_get_param,
2408 .get_session_param = iscsi_session_get_param,
2409 .start_conn = iscsi_conn_start,
2410 .stop_conn = iscsi_tcp_conn_stop,
2411 /* IO */
2412 .send_pdu = iscsi_conn_send_pdu,
2413 .get_stats = iscsi_conn_get_stats,
2414 .init_cmd_task = iscsi_tcp_cmd_init,
2415 .init_mgmt_task = iscsi_tcp_mgmt_init,
2416 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2417 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2418 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2419 /* recovery */
2420 .session_recovery_timedout = iscsi_session_recovery_timedout,
2421 };
2422
2423 static int __init
2424 iscsi_tcp_init(void)
2425 {
2426 if (iscsi_max_lun < 1) {
2427 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2428 iscsi_max_lun);
2429 return -EINVAL;
2430 }
2431 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2432
2433 if (!iscsi_register_transport(&iscsi_tcp_transport))
2434 return -ENODEV;
2435
2436 return 0;
2437 }
2438
2439 static void __exit
2440 iscsi_tcp_exit(void)
2441 {
2442 iscsi_unregister_transport(&iscsi_tcp_transport);
2443 }
2444
2445 module_init(iscsi_tcp_init);
2446 module_exit(iscsi_tcp_exit);
Linux kernel - Deliverables
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