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Merge branch 'master'
[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 Mike Christie
7 * maintained by open-iscsi@googlegroups.com
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published
11 * by the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * See the file COPYING included with this distribution for more details.
20 *
21 * Credits:
22 * Christoph Hellwig
23 * FUJITA Tomonori
24 * Arne Redlich
25 * Zhenyu Wang
26 */
27
28 #include <linux/types.h>
29 #include <linux/list.h>
30 #include <linux/inet.h>
31 #include <linux/blkdev.h>
32 #include <linux/crypto.h>
33 #include <linux/delay.h>
34 #include <linux/kfifo.h>
35 #include <linux/scatterlist.h>
36 #include <net/tcp.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_device.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_request.h>
41 #include <scsi/scsi_tcq.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_transport_iscsi.h>
45
46 #include "iscsi_tcp.h"
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("0:4.409");
53 /* #define DEBUG_TCP */
54 /* #define DEBUG_SCSI */
55 #define DEBUG_ASSERT
56
57 #ifdef DEBUG_TCP
58 #define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
59 #else
60 #define debug_tcp(fmt...)
61 #endif
62
63 #ifdef DEBUG_SCSI
64 #define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
65 #else
66 #define debug_scsi(fmt...)
67 #endif
68
69 #ifndef DEBUG_ASSERT
70 #ifdef BUG_ON
71 #undef BUG_ON
72 #endif
73 #define BUG_ON(expr)
74 #endif
75
76 #define INVALID_SN_DELTA 0xffff
77
78 static unsigned int iscsi_max_lun = 512;
79 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
80
81 /* global data */
82 static kmem_cache_t *taskcache;
83
84 static inline void
85 iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
86 {
87 sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
88 ibuf->sent = 0;
89 }
90
91 static inline void
92 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
93 {
94 ibuf->sg.page = (void*)vbuf;
95 ibuf->sg.offset = (unsigned int)-1;
96 ibuf->sg.length = size;
97 ibuf->sent = 0;
98 }
99
100 static inline void*
101 iscsi_buf_iov_base(struct iscsi_buf *ibuf)
102 {
103 return (char*)ibuf->sg.page + ibuf->sent;
104 }
105
106 static inline void
107 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
108 {
109 /*
110 * Fastpath: sg element fits into single page
111 */
112 if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) {
113 ibuf->sg.page = sg->page;
114 ibuf->sg.offset = sg->offset;
115 ibuf->sg.length = sg->length;
116 } else
117 iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length);
118 ibuf->sent = 0;
119 }
120
121 static inline int
122 iscsi_buf_left(struct iscsi_buf *ibuf)
123 {
124 int rc;
125
126 rc = ibuf->sg.length - ibuf->sent;
127 BUG_ON(rc < 0);
128 return rc;
129 }
130
131 static inline void
132 iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
133 u8* crc)
134 {
135 crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
136 buf->sg.length += sizeof(uint32_t);
137 }
138
139 static void
140 iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
141 {
142 struct iscsi_session *session = conn->session;
143 unsigned long flags;
144
145 spin_lock_irqsave(&session->lock, flags);
146 if (session->conn_cnt == 1 || session->leadconn == conn)
147 session->state = ISCSI_STATE_FAILED;
148 spin_unlock_irqrestore(&session->lock, flags);
149 set_bit(SUSPEND_BIT, &conn->suspend_tx);
150 set_bit(SUSPEND_BIT, &conn->suspend_rx);
151 iscsi_conn_error(iscsi_handle(conn), err);
152 }
153
154 static inline int
155 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
156 {
157 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
158 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
159
160 if (max_cmdsn < exp_cmdsn -1 &&
161 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
162 return ISCSI_ERR_MAX_CMDSN;
163 if (max_cmdsn > session->max_cmdsn ||
164 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
165 session->max_cmdsn = max_cmdsn;
166 if (exp_cmdsn > session->exp_cmdsn ||
167 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
168 session->exp_cmdsn = exp_cmdsn;
169
170 return 0;
171 }
172
173 static inline int
174 iscsi_hdr_extract(struct iscsi_conn *conn)
175 {
176 struct sk_buff *skb = conn->in.skb;
177
178 if (conn->in.copy >= conn->hdr_size &&
179 conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
180 /*
181 * Zero-copy PDU Header: using connection context
182 * to store header pointer.
183 */
184 if (skb_shinfo(skb)->frag_list == NULL &&
185 !skb_shinfo(skb)->nr_frags)
186 conn->in.hdr = (struct iscsi_hdr *)
187 ((char*)skb->data + conn->in.offset);
188 else {
189 /* ignoring return code since we checked
190 * in.copy before */
191 skb_copy_bits(skb, conn->in.offset,
192 &conn->hdr, conn->hdr_size);
193 conn->in.hdr = &conn->hdr;
194 }
195 conn->in.offset += conn->hdr_size;
196 conn->in.copy -= conn->hdr_size;
197 } else {
198 int hdr_remains;
199 int copylen;
200
201 /*
202 * PDU header scattered across SKB's,
203 * copying it... This'll happen quite rarely.
204 */
205
206 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
207 conn->in.hdr_offset = 0;
208
209 hdr_remains = conn->hdr_size - conn->in.hdr_offset;
210 BUG_ON(hdr_remains <= 0);
211
212 copylen = min(conn->in.copy, hdr_remains);
213 skb_copy_bits(skb, conn->in.offset,
214 (char*)&conn->hdr + conn->in.hdr_offset, copylen);
215
216 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
217 "in.copy %d\n", conn->in.hdr_offset, copylen,
218 conn->in.offset, conn->in.copy);
219
220 conn->in.offset += copylen;
221 conn->in.copy -= copylen;
222 if (copylen < hdr_remains) {
223 conn->in_progress = IN_PROGRESS_HEADER_GATHER;
224 conn->in.hdr_offset += copylen;
225 return -EAGAIN;
226 }
227 conn->in.hdr = &conn->hdr;
228 conn->discontiguous_hdr_cnt++;
229 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
230 }
231
232 return 0;
233 }
234
235 static inline void
236 iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
237 {
238 struct scsi_cmnd *sc = ctask->sc;
239 struct iscsi_session *session = conn->session;
240
241 spin_lock(&session->lock);
242 if (unlikely(!sc)) {
243 spin_unlock(&session->lock);
244 return;
245 }
246 if (sc->sc_data_direction == DMA_TO_DEVICE) {
247 struct iscsi_data_task *dtask, *n;
248 /* WRITE: cleanup Data-Out's if any */
249 spin_lock(&conn->lock);
250 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
251 list_del(&dtask->item);
252 mempool_free(dtask, ctask->datapool);
253 }
254 spin_unlock(&conn->lock);
255 }
256 ctask->xmstate = XMSTATE_IDLE;
257 ctask->r2t = NULL;
258 ctask->sc = NULL;
259 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
260 spin_unlock(&session->lock);
261 }
262
263 /**
264 * iscsi_cmd_rsp - SCSI Command Response processing
265 * @conn: iscsi connection
266 * @ctask: scsi command task
267 **/
268 static int
269 iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
270 {
271 int rc;
272 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
273 struct iscsi_session *session = conn->session;
274 struct scsi_cmnd *sc = ctask->sc;
275
276 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
277 if (rc) {
278 sc->result = (DID_ERROR << 16);
279 goto out;
280 }
281
282 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
283
284 sc->result = (DID_OK << 16) | rhdr->cmd_status;
285
286 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
287 sc->result = (DID_ERROR << 16);
288 goto out;
289 }
290
291 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
292 int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
293
294 memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
295 debug_scsi("copied %d bytes of sense\n", sensecopy);
296 }
297
298 if (sc->sc_data_direction == DMA_TO_DEVICE)
299 goto out;
300
301 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
302 int res_count = be32_to_cpu(rhdr->residual_count);
303
304 if (res_count > 0 && res_count <= sc->request_bufflen)
305 sc->resid = res_count;
306 else
307 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
308 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
309 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
310 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
311 sc->resid = be32_to_cpu(rhdr->residual_count);
312
313 out:
314 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
315 (long)sc, sc->result, ctask->itt);
316 conn->scsirsp_pdus_cnt++;
317 iscsi_ctask_cleanup(conn, ctask);
318 sc->scsi_done(sc);
319 return rc;
320 }
321
322 /**
323 * iscsi_data_rsp - SCSI Data-In Response processing
324 * @conn: iscsi connection
325 * @ctask: scsi command task
326 **/
327 static int
328 iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
329 {
330 int rc;
331 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
332 struct iscsi_session *session = conn->session;
333 int datasn = be32_to_cpu(rhdr->datasn);
334
335 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
336 if (rc)
337 return rc;
338 /*
339 * setup Data-In byte counter (gets decremented..)
340 */
341 ctask->data_count = conn->in.datalen;
342
343 if (conn->in.datalen == 0)
344 return 0;
345
346 if (ctask->datasn != datasn)
347 return ISCSI_ERR_DATASN;
348
349 ctask->datasn++;
350
351 ctask->data_offset = be32_to_cpu(rhdr->offset);
352 if (ctask->data_offset + conn->in.datalen > ctask->total_length)
353 return ISCSI_ERR_DATA_OFFSET;
354
355 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
356 struct scsi_cmnd *sc = ctask->sc;
357
358 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
359 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
360 int res_count = be32_to_cpu(rhdr->residual_count);
361
362 if (res_count > 0 &&
363 res_count <= sc->request_bufflen) {
364 sc->resid = res_count;
365 sc->result = (DID_OK << 16) | rhdr->cmd_status;
366 } else
367 sc->result = (DID_BAD_TARGET << 16) |
368 rhdr->cmd_status;
369 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
370 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
371 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
372 sc->resid = be32_to_cpu(rhdr->residual_count);
373 sc->result = (DID_OK << 16) | rhdr->cmd_status;
374 } else
375 sc->result = (DID_OK << 16) | rhdr->cmd_status;
376 }
377
378 conn->datain_pdus_cnt++;
379 return 0;
380 }
381
382 /**
383 * iscsi_solicit_data_init - initialize first Data-Out
384 * @conn: iscsi connection
385 * @ctask: scsi command task
386 * @r2t: R2T info
387 *
388 * Notes:
389 * Initialize first Data-Out within this R2T sequence and finds
390 * proper data_offset within this SCSI command.
391 *
392 * This function is called with connection lock taken.
393 **/
394 static void
395 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
396 struct iscsi_r2t_info *r2t)
397 {
398 struct iscsi_data *hdr;
399 struct iscsi_data_task *dtask;
400 struct scsi_cmnd *sc = ctask->sc;
401
402 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
403 BUG_ON(!dtask);
404 hdr = &dtask->hdr;
405 memset(hdr, 0, sizeof(struct iscsi_data));
406 hdr->ttt = r2t->ttt;
407 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
408 r2t->solicit_datasn++;
409 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
410 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
411 hdr->itt = ctask->hdr.itt;
412 hdr->exp_statsn = r2t->exp_statsn;
413 hdr->offset = cpu_to_be32(r2t->data_offset);
414 if (r2t->data_length > conn->max_xmit_dlength) {
415 hton24(hdr->dlength, conn->max_xmit_dlength);
416 r2t->data_count = conn->max_xmit_dlength;
417 hdr->flags = 0;
418 } else {
419 hton24(hdr->dlength, r2t->data_length);
420 r2t->data_count = r2t->data_length;
421 hdr->flags = ISCSI_FLAG_CMD_FINAL;
422 }
423 conn->dataout_pdus_cnt++;
424
425 r2t->sent = 0;
426
427 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
428 sizeof(struct iscsi_hdr));
429
430 r2t->dtask = dtask;
431
432 if (sc->use_sg) {
433 int i, sg_count = 0;
434 struct scatterlist *sg = sc->request_buffer;
435
436 r2t->sg = NULL;
437 for (i = 0; i < sc->use_sg; i++, sg += 1) {
438 /* FIXME: prefetch ? */
439 if (sg_count + sg->length > r2t->data_offset) {
440 int page_offset;
441
442 /* sg page found! */
443
444 /* offset within this page */
445 page_offset = r2t->data_offset - sg_count;
446
447 /* fill in this buffer */
448 iscsi_buf_init_sg(&r2t->sendbuf, sg);
449 r2t->sendbuf.sg.offset += page_offset;
450 r2t->sendbuf.sg.length -= page_offset;
451
452 /* xmit logic will continue with next one */
453 r2t->sg = sg + 1;
454 break;
455 }
456 sg_count += sg->length;
457 }
458 BUG_ON(r2t->sg == NULL);
459 } else
460 iscsi_buf_init_iov(&ctask->sendbuf,
461 (char*)sc->request_buffer + r2t->data_offset,
462 r2t->data_count);
463
464 list_add(&dtask->item, &ctask->dataqueue);
465 }
466
467 /**
468 * iscsi_r2t_rsp - iSCSI R2T Response processing
469 * @conn: iscsi connection
470 * @ctask: scsi command task
471 **/
472 static int
473 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
474 {
475 struct iscsi_r2t_info *r2t;
476 struct iscsi_session *session = conn->session;
477 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
478 int r2tsn = be32_to_cpu(rhdr->r2tsn);
479 int rc;
480
481 if (conn->in.ahslen)
482 return ISCSI_ERR_AHSLEN;
483
484 if (conn->in.datalen)
485 return ISCSI_ERR_DATALEN;
486
487 if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
488 return ISCSI_ERR_R2TSN;
489
490 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
491 if (rc)
492 return rc;
493
494 /* FIXME: use R2TSN to detect missing R2T */
495
496 /* fill-in new R2T associated with the task */
497 spin_lock(&session->lock);
498 if (!ctask->sc || ctask->mtask ||
499 session->state != ISCSI_STATE_LOGGED_IN) {
500 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
501 "recovery...\n", ctask->itt);
502 spin_unlock(&session->lock);
503 return 0;
504 }
505 rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
506 BUG_ON(!rc);
507
508 r2t->exp_statsn = rhdr->statsn;
509 r2t->data_length = be32_to_cpu(rhdr->data_length);
510 if (r2t->data_length == 0 ||
511 r2t->data_length > session->max_burst) {
512 spin_unlock(&session->lock);
513 return ISCSI_ERR_DATALEN;
514 }
515
516 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
517 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
518 spin_unlock(&session->lock);
519 return ISCSI_ERR_DATALEN;
520 }
521
522 r2t->ttt = rhdr->ttt; /* no flip */
523 r2t->solicit_datasn = 0;
524
525 iscsi_solicit_data_init(conn, ctask, r2t);
526
527 ctask->exp_r2tsn = r2tsn + 1;
528 ctask->xmstate |= XMSTATE_SOL_HDR;
529 __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
530 __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
531
532 schedule_work(&conn->xmitwork);
533 conn->r2t_pdus_cnt++;
534 spin_unlock(&session->lock);
535
536 return 0;
537 }
538
539 static int
540 iscsi_hdr_recv(struct iscsi_conn *conn)
541 {
542 int rc = 0;
543 struct iscsi_hdr *hdr;
544 struct iscsi_cmd_task *ctask;
545 struct iscsi_session *session = conn->session;
546 uint32_t cdgst, rdgst = 0;
547
548 hdr = conn->in.hdr;
549
550 /* verify PDU length */
551 conn->in.datalen = ntoh24(hdr->dlength);
552 if (conn->in.datalen > conn->max_recv_dlength) {
553 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
554 conn->in.datalen, conn->max_recv_dlength);
555 return ISCSI_ERR_DATALEN;
556 }
557 conn->data_copied = 0;
558
559 /* read AHS */
560 conn->in.ahslen = hdr->hlength * 4;
561 conn->in.offset += conn->in.ahslen;
562 conn->in.copy -= conn->in.ahslen;
563 if (conn->in.copy < 0) {
564 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
565 "%d bytes\n", conn->in.ahslen);
566 return ISCSI_ERR_AHSLEN;
567 }
568
569 /* calculate read padding */
570 conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
571 if (conn->in.padding) {
572 conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
573 debug_scsi("read padding %d bytes\n", conn->in.padding);
574 }
575
576 if (conn->hdrdgst_en) {
577 struct scatterlist sg;
578
579 sg_init_one(&sg, (u8 *)hdr,
580 sizeof(struct iscsi_hdr) + conn->in.ahslen);
581 crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
582 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
583 conn->in.ahslen);
584 }
585
586 /* save opcode for later */
587 conn->in.opcode = hdr->opcode;
588
589 /* verify itt (itt encoding: age+cid+itt) */
590 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
591 if ((hdr->itt & AGE_MASK) !=
592 (session->age << AGE_SHIFT)) {
593 printk(KERN_ERR "iscsi_tcp: received itt %x expected "
594 "session age (%x)\n", hdr->itt,
595 session->age & AGE_MASK);
596 return ISCSI_ERR_BAD_ITT;
597 }
598
599 if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
600 printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
601 "CID (%x)\n", hdr->itt, conn->id);
602 return ISCSI_ERR_BAD_ITT;
603 }
604 conn->in.itt = hdr->itt & ITT_MASK;
605 } else
606 conn->in.itt = hdr->itt;
607
608 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
609 hdr->opcode, conn->in.offset, conn->in.copy,
610 conn->in.ahslen, conn->in.datalen);
611
612 if (conn->in.itt < session->cmds_max) {
613 if (conn->hdrdgst_en && cdgst != rdgst) {
614 printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
615 "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
616 cdgst);
617 return ISCSI_ERR_HDR_DGST;
618 }
619
620 ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
621
622 if (!ctask->sc) {
623 printk(KERN_INFO "iscsi_tcp: dropping ctask with "
624 "itt 0x%x\n", ctask->itt);
625 conn->in.datalen = 0; /* force drop */
626 return 0;
627 }
628
629 if (ctask->sc->SCp.phase != session->age) {
630 printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
631 "expected %d\n", ctask->sc->SCp.phase,
632 session->age);
633 return ISCSI_ERR_SESSION_FAILED;
634 }
635
636 conn->in.ctask = ctask;
637
638 debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
639 hdr->opcode, conn->id, (long)ctask->sc,
640 ctask->itt, conn->in.datalen);
641
642 switch(conn->in.opcode) {
643 case ISCSI_OP_SCSI_CMD_RSP:
644 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
645 if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE)
646 rc = iscsi_cmd_rsp(conn, ctask);
647 else if (!conn->in.datalen)
648 rc = iscsi_cmd_rsp(conn, ctask);
649 else
650 /*
651 * got sense or response data; copying PDU
652 * Header to the connection's header
653 * placeholder
654 */
655 memcpy(&conn->hdr, hdr,
656 sizeof(struct iscsi_hdr));
657 break;
658 case ISCSI_OP_SCSI_DATA_IN:
659 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
660 /* save flags for non-exceptional status */
661 conn->in.flags = hdr->flags;
662 /* save cmd_status for sense data */
663 conn->in.cmd_status =
664 ((struct iscsi_data_rsp*)hdr)->cmd_status;
665 rc = iscsi_data_rsp(conn, ctask);
666 break;
667 case ISCSI_OP_R2T:
668 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
669 if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE &&
670 ctask->sc->sc_data_direction == DMA_TO_DEVICE)
671 rc = iscsi_r2t_rsp(conn, ctask);
672 else
673 rc = ISCSI_ERR_PROTO;
674 break;
675 default:
676 rc = ISCSI_ERR_BAD_OPCODE;
677 break;
678 }
679 } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
680 conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
681 session->mgmtpool_max) {
682 struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
683 session->mgmt_cmds[conn->in.itt -
684 ISCSI_MGMT_ITT_OFFSET];
685
686 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
687 conn->in.opcode, conn->id, mtask->itt,
688 conn->in.datalen);
689
690 switch(conn->in.opcode) {
691 case ISCSI_OP_LOGIN_RSP:
692 case ISCSI_OP_TEXT_RSP:
693 case ISCSI_OP_LOGOUT_RSP:
694 rc = iscsi_check_assign_cmdsn(session,
695 (struct iscsi_nopin*)hdr);
696 if (rc)
697 break;
698
699 if (!conn->in.datalen) {
700 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
701 NULL, 0);
702 if (conn->login_mtask != mtask) {
703 spin_lock(&session->lock);
704 __kfifo_put(session->mgmtpool.queue,
705 (void*)&mtask, sizeof(void*));
706 spin_unlock(&session->lock);
707 }
708 }
709 break;
710 case ISCSI_OP_SCSI_TMFUNC_RSP:
711 rc = iscsi_check_assign_cmdsn(session,
712 (struct iscsi_nopin*)hdr);
713 if (rc)
714 break;
715
716 if (conn->in.datalen || conn->in.ahslen) {
717 rc = ISCSI_ERR_PROTO;
718 break;
719 }
720 conn->tmfrsp_pdus_cnt++;
721 spin_lock(&session->lock);
722 if (conn->tmabort_state == TMABORT_INITIAL) {
723 __kfifo_put(session->mgmtpool.queue,
724 (void*)&mtask, sizeof(void*));
725 conn->tmabort_state =
726 ((struct iscsi_tm_rsp *)hdr)->
727 response == ISCSI_TMF_RSP_COMPLETE ?
728 TMABORT_SUCCESS:TMABORT_FAILED;
729 /* unblock eh_abort() */
730 wake_up(&conn->ehwait);
731 }
732 spin_unlock(&session->lock);
733 break;
734 case ISCSI_OP_NOOP_IN:
735 if (hdr->ttt != ISCSI_RESERVED_TAG) {
736 rc = ISCSI_ERR_PROTO;
737 break;
738 }
739 rc = iscsi_check_assign_cmdsn(session,
740 (struct iscsi_nopin*)hdr);
741 if (rc)
742 break;
743 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
744
745 if (!conn->in.datalen) {
746 struct iscsi_mgmt_task *mtask;
747
748 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
749 NULL, 0);
750 mtask = (struct iscsi_mgmt_task *)
751 session->mgmt_cmds[conn->in.itt -
752 ISCSI_MGMT_ITT_OFFSET];
753 if (conn->login_mtask != mtask) {
754 spin_lock(&session->lock);
755 __kfifo_put(session->mgmtpool.queue,
756 (void*)&mtask, sizeof(void*));
757 spin_unlock(&session->lock);
758 }
759 }
760 break;
761 default:
762 rc = ISCSI_ERR_BAD_OPCODE;
763 break;
764 }
765 } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
766 switch(conn->in.opcode) {
767 case ISCSI_OP_NOOP_IN:
768 if (!conn->in.datalen) {
769 rc = iscsi_check_assign_cmdsn(session,
770 (struct iscsi_nopin*)hdr);
771 if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
772 rc = iscsi_recv_pdu(iscsi_handle(conn),
773 hdr, NULL, 0);
774 } else
775 rc = ISCSI_ERR_PROTO;
776 break;
777 case ISCSI_OP_REJECT:
778 /* we need sth like iscsi_reject_rsp()*/
779 case ISCSI_OP_ASYNC_EVENT:
780 /* we need sth like iscsi_async_event_rsp() */
781 rc = ISCSI_ERR_BAD_OPCODE;
782 break;
783 default:
784 rc = ISCSI_ERR_BAD_OPCODE;
785 break;
786 }
787 } else
788 rc = ISCSI_ERR_BAD_ITT;
789
790 return rc;
791 }
792
793 /**
794 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
795 * @conn: iscsi connection
796 * @ctask: scsi command task
797 * @buf: buffer to copy to
798 * @buf_size: size of buffer
799 * @offset: offset within the buffer
800 *
801 * Notes:
802 * The function calls skb_copy_bits() and updates per-connection and
803 * per-cmd byte counters.
804 *
805 * Read counters (in bytes):
806 *
807 * conn->in.offset offset within in progress SKB
808 * conn->in.copy left to copy from in progress SKB
809 * including padding
810 * conn->in.copied copied already from in progress SKB
811 * conn->data_copied copied already from in progress buffer
812 * ctask->sent total bytes sent up to the MidLayer
813 * ctask->data_count left to copy from in progress Data-In
814 * buf_left left to copy from in progress buffer
815 **/
816 static inline int
817 iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
818 void *buf, int buf_size, int offset)
819 {
820 int buf_left = buf_size - (conn->data_copied + offset);
821 int size = min(conn->in.copy, buf_left);
822 int rc;
823
824 size = min(size, ctask->data_count);
825
826 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
827 size, conn->in.offset, conn->in.copied);
828
829 BUG_ON(size <= 0);
830 BUG_ON(ctask->sent + size > ctask->total_length);
831
832 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
833 (char*)buf + (offset + conn->data_copied), size);
834 /* must fit into skb->len */
835 BUG_ON(rc);
836
837 conn->in.offset += size;
838 conn->in.copy -= size;
839 conn->in.copied += size;
840 conn->data_copied += size;
841 ctask->sent += size;
842 ctask->data_count -= size;
843
844 BUG_ON(conn->in.copy < 0);
845 BUG_ON(ctask->data_count < 0);
846
847 if (buf_size != (conn->data_copied + offset)) {
848 if (!ctask->data_count) {
849 BUG_ON(buf_size - conn->data_copied < 0);
850 /* done with this PDU */
851 return buf_size - conn->data_copied;
852 }
853 return -EAGAIN;
854 }
855
856 /* done with this buffer or with both - PDU and buffer */
857 conn->data_copied = 0;
858 return 0;
859 }
860
861 /**
862 * iscsi_tcp_copy - copy skb bits to the destanation buffer
863 * @conn: iscsi connection
864 * @buf: buffer to copy to
865 * @buf_size: number of bytes to copy
866 *
867 * Notes:
868 * The function calls skb_copy_bits() and updates per-connection
869 * byte counters.
870 **/
871 static inline int
872 iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
873 {
874 int buf_left = buf_size - conn->data_copied;
875 int size = min(conn->in.copy, buf_left);
876 int rc;
877
878 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
879 size, conn->in.offset, conn->data_copied);
880 BUG_ON(size <= 0);
881
882 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
883 (char*)buf + conn->data_copied, size);
884 BUG_ON(rc);
885
886 conn->in.offset += size;
887 conn->in.copy -= size;
888 conn->in.copied += size;
889 conn->data_copied += size;
890
891 if (buf_size != conn->data_copied)
892 return -EAGAIN;
893
894 return 0;
895 }
896
897 static inline void
898 partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
899 int offset, int length)
900 {
901 struct scatterlist temp;
902
903 memcpy(&temp, sg, sizeof(struct scatterlist));
904 temp.offset = offset;
905 temp.length = length;
906 crypto_digest_update(conn->data_rx_tfm, &temp, 1);
907 }
908
909 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
910 {
911 struct iscsi_cmd_task *ctask = conn->in.ctask;
912 struct scsi_cmnd *sc = ctask->sc;
913 struct scatterlist tmp, *sg;
914 int i, offset, rc = 0;
915
916 BUG_ON((void*)ctask != sc->SCp.ptr);
917
918 /*
919 * copying Data-In into the Scsi_Cmnd
920 */
921 if (!sc->use_sg) {
922 i = ctask->data_count;
923 rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
924 sc->request_bufflen, ctask->data_offset);
925 if (rc == -EAGAIN)
926 return rc;
927 if (conn->datadgst_en) {
928 sg_init_one(&tmp, sc->request_buffer, i);
929 crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
930 }
931 rc = 0;
932 goto done;
933 }
934
935 offset = ctask->data_offset;
936 sg = sc->request_buffer;
937
938 if (ctask->data_offset)
939 for (i = 0; i < ctask->sg_count; i++)
940 offset -= sg[i].length;
941 /* we've passed through partial sg*/
942 if (offset < 0)
943 offset = 0;
944
945 for (i = ctask->sg_count; i < sc->use_sg; i++) {
946 char *dest;
947
948 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
949 rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
950 sg[i].length, offset);
951 kunmap_atomic(dest, KM_SOFTIRQ0);
952 if (rc == -EAGAIN)
953 /* continue with the next SKB/PDU */
954 return rc;
955 if (!rc) {
956 if (conn->datadgst_en) {
957 if (!offset)
958 crypto_digest_update(conn->data_rx_tfm,
959 &sg[i], 1);
960 else
961 partial_sg_digest_update(conn, &sg[i],
962 sg[i].offset + offset,
963 sg[i].length - offset);
964 }
965 offset = 0;
966 ctask->sg_count++;
967 }
968
969 if (!ctask->data_count) {
970 if (rc && conn->datadgst_en)
971 /*
972 * data-in is complete, but buffer not...
973 */
974 partial_sg_digest_update(conn, &sg[i],
975 sg[i].offset, sg[i].length-rc);
976 rc = 0;
977 break;
978 }
979
980 if (!conn->in.copy)
981 return -EAGAIN;
982 }
983 BUG_ON(ctask->data_count);
984
985 done:
986 /* check for non-exceptional status */
987 if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
988 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
989 (long)sc, sc->result, ctask->itt);
990 conn->scsirsp_pdus_cnt++;
991 iscsi_ctask_cleanup(conn, ctask);
992 sc->scsi_done(sc);
993 }
994
995 return rc;
996 }
997
998 static int
999 iscsi_data_recv(struct iscsi_conn *conn)
1000 {
1001 struct iscsi_session *session = conn->session;
1002 int rc = 0;
1003
1004 switch(conn->in.opcode) {
1005 case ISCSI_OP_SCSI_DATA_IN:
1006 rc = iscsi_scsi_data_in(conn);
1007 break;
1008 case ISCSI_OP_SCSI_CMD_RSP: {
1009 /*
1010 * SCSI Sense Data:
1011 * copying the entire Data Segment.
1012 */
1013 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1014 rc = -EAGAIN;
1015 goto exit;
1016 }
1017
1018 /*
1019 * check for sense
1020 */
1021 conn->in.hdr = &conn->hdr;
1022 conn->senselen = (conn->data[0] << 8) | conn->data[1];
1023 rc = iscsi_cmd_rsp(conn, conn->in.ctask);
1024 }
1025 break;
1026 case ISCSI_OP_TEXT_RSP:
1027 case ISCSI_OP_LOGIN_RSP:
1028 case ISCSI_OP_NOOP_IN: {
1029 struct iscsi_mgmt_task *mtask = NULL;
1030
1031 if (conn->in.itt != ISCSI_RESERVED_TAG)
1032 mtask = (struct iscsi_mgmt_task *)
1033 session->mgmt_cmds[conn->in.itt -
1034 ISCSI_MGMT_ITT_OFFSET];
1035
1036 /*
1037 * Collect data segment to the connection's data
1038 * placeholder
1039 */
1040 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1041 rc = -EAGAIN;
1042 goto exit;
1043 }
1044
1045 rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
1046 conn->data, conn->in.datalen);
1047
1048 if (mtask && conn->login_mtask != mtask) {
1049 spin_lock(&session->lock);
1050 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1051 sizeof(void*));
1052 spin_unlock(&session->lock);
1053 }
1054 }
1055 break;
1056 default:
1057 BUG_ON(1);
1058 }
1059 exit:
1060 return rc;
1061 }
1062
1063 /**
1064 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
1065 * @rd_desc: read descriptor
1066 * @skb: socket buffer
1067 * @offset: offset in skb
1068 * @len: skb->len - offset
1069 **/
1070 static int
1071 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
1072 unsigned int offset, size_t len)
1073 {
1074 int rc;
1075 struct iscsi_conn *conn = rd_desc->arg.data;
1076 int processed;
1077 char pad[ISCSI_PAD_LEN];
1078 struct scatterlist sg;
1079
1080 /*
1081 * Save current SKB and its offset in the corresponding
1082 * connection context.
1083 */
1084 conn->in.copy = skb->len - offset;
1085 conn->in.offset = offset;
1086 conn->in.skb = skb;
1087 conn->in.len = conn->in.copy;
1088 BUG_ON(conn->in.copy <= 0);
1089 debug_tcp("in %d bytes\n", conn->in.copy);
1090
1091 more:
1092 conn->in.copied = 0;
1093 rc = 0;
1094
1095 if (unlikely(conn->suspend_rx)) {
1096 debug_tcp("conn %d Rx suspended!\n", conn->id);
1097 return 0;
1098 }
1099
1100 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
1101 conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
1102 rc = iscsi_hdr_extract(conn);
1103 if (rc) {
1104 if (rc == -EAGAIN)
1105 goto nomore;
1106 else {
1107 iscsi_conn_failure(conn, rc);
1108 return 0;
1109 }
1110 }
1111
1112 /*
1113 * Verify and process incoming PDU header.
1114 */
1115 rc = iscsi_hdr_recv(conn);
1116 if (!rc && conn->in.datalen) {
1117 if (conn->datadgst_en &&
1118 conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1119 BUG_ON(!conn->data_rx_tfm);
1120 crypto_digest_init(conn->data_rx_tfm);
1121 }
1122 conn->in_progress = IN_PROGRESS_DATA_RECV;
1123 } else if (rc) {
1124 iscsi_conn_failure(conn, rc);
1125 return 0;
1126 }
1127 }
1128
1129 if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
1130 debug_tcp("extra data_recv offset %d copy %d\n",
1131 conn->in.offset, conn->in.copy);
1132 if (conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1133 uint32_t recv_digest;
1134 skb_copy_bits(conn->in.skb, conn->in.offset,
1135 &recv_digest, 4);
1136 conn->in.offset += 4;
1137 conn->in.copy -= 4;
1138 if (recv_digest != conn->in.datadgst) {
1139 debug_tcp("iscsi_tcp: data digest error!"
1140 "0x%x != 0x%x\n", recv_digest,
1141 conn->in.datadgst);
1142 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1143 return 0;
1144 } else {
1145 debug_tcp("iscsi_tcp: data digest match!"
1146 "0x%x == 0x%x\n", recv_digest,
1147 conn->in.datadgst);
1148 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1149 }
1150 }
1151 }
1152
1153 if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
1154
1155 debug_tcp("data_recv offset %d copy %d\n",
1156 conn->in.offset, conn->in.copy);
1157
1158 rc = iscsi_data_recv(conn);
1159 if (rc) {
1160 if (rc == -EAGAIN) {
1161 rd_desc->count = conn->in.datalen -
1162 conn->in.ctask->data_count;
1163 goto again;
1164 }
1165 iscsi_conn_failure(conn, rc);
1166 return 0;
1167 }
1168 conn->in.copy -= conn->in.padding;
1169 conn->in.offset += conn->in.padding;
1170 if (conn->datadgst_en &&
1171 conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1172 if (conn->in.padding) {
1173 debug_tcp("padding -> %d\n", conn->in.padding);
1174 memset(pad, 0, conn->in.padding);
1175 sg_init_one(&sg, pad, conn->in.padding);
1176 crypto_digest_update(conn->data_rx_tfm, &sg, 1);
1177 }
1178 crypto_digest_final(conn->data_rx_tfm,
1179 (u8 *) & conn->in.datadgst);
1180 debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
1181 conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
1182 } else
1183 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1184 }
1185
1186 debug_tcp("f, processed %d from out of %d padding %d\n",
1187 conn->in.offset - offset, (int)len, conn->in.padding);
1188 BUG_ON(conn->in.offset - offset > len);
1189
1190 if (conn->in.offset - offset != len) {
1191 debug_tcp("continue to process %d bytes\n",
1192 (int)len - (conn->in.offset - offset));
1193 goto more;
1194 }
1195
1196 nomore:
1197 processed = conn->in.offset - offset;
1198 BUG_ON(processed == 0);
1199 return processed;
1200
1201 again:
1202 processed = conn->in.offset - offset;
1203 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1204 processed, (int)len, (int)rd_desc->count);
1205 BUG_ON(processed == 0);
1206 BUG_ON(processed > len);
1207
1208 conn->rxdata_octets += processed;
1209 return processed;
1210 }
1211
1212 static void
1213 iscsi_tcp_data_ready(struct sock *sk, int flag)
1214 {
1215 struct iscsi_conn *conn = sk->sk_user_data;
1216 read_descriptor_t rd_desc;
1217
1218 read_lock(&sk->sk_callback_lock);
1219
1220 /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
1221 rd_desc.arg.data = conn;
1222 rd_desc.count = 0;
1223 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1224
1225 read_unlock(&sk->sk_callback_lock);
1226 }
1227
1228 static void
1229 iscsi_tcp_state_change(struct sock *sk)
1230 {
1231 struct iscsi_conn *conn;
1232 struct iscsi_session *session;
1233 void (*old_state_change)(struct sock *);
1234
1235 read_lock(&sk->sk_callback_lock);
1236
1237 conn = (struct iscsi_conn*)sk->sk_user_data;
1238 session = conn->session;
1239
1240 if (sk->sk_state == TCP_CLOSE_WAIT ||
1241 sk->sk_state == TCP_CLOSE) {
1242 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1243 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1244 }
1245
1246 old_state_change = conn->old_state_change;
1247
1248 read_unlock(&sk->sk_callback_lock);
1249
1250 old_state_change(sk);
1251 }
1252
1253 /**
1254 * iscsi_write_space - Called when more output buffer space is available
1255 * @sk: socket space is available for
1256 **/
1257 static void
1258 iscsi_write_space(struct sock *sk)
1259 {
1260 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1261 conn->old_write_space(sk);
1262 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1263 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
1264 schedule_work(&conn->xmitwork);
1265 }
1266
1267 static void
1268 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1269 {
1270 struct sock *sk = conn->sock->sk;
1271
1272 /* assign new callbacks */
1273 write_lock_bh(&sk->sk_callback_lock);
1274 sk->sk_user_data = conn;
1275 conn->old_data_ready = sk->sk_data_ready;
1276 conn->old_state_change = sk->sk_state_change;
1277 conn->old_write_space = sk->sk_write_space;
1278 sk->sk_data_ready = iscsi_tcp_data_ready;
1279 sk->sk_state_change = iscsi_tcp_state_change;
1280 sk->sk_write_space = iscsi_write_space;
1281 write_unlock_bh(&sk->sk_callback_lock);
1282 }
1283
1284 static void
1285 iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
1286 {
1287 struct sock *sk = conn->sock->sk;
1288
1289 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1290 write_lock_bh(&sk->sk_callback_lock);
1291 sk->sk_user_data = NULL;
1292 sk->sk_data_ready = conn->old_data_ready;
1293 sk->sk_state_change = conn->old_state_change;
1294 sk->sk_write_space = conn->old_write_space;
1295 sk->sk_no_check = 0;
1296 write_unlock_bh(&sk->sk_callback_lock);
1297 }
1298
1299 /**
1300 * iscsi_send - generic send routine
1301 * @sk: kernel's socket
1302 * @buf: buffer to write from
1303 * @size: actual size to write
1304 * @flags: socket's flags
1305 *
1306 * Notes:
1307 * depending on buffer will use tcp_sendpage() or tcp_sendmsg().
1308 * buf->sg.offset == -1 tells us that buffer is non S/G and forces
1309 * to use tcp_sendmsg().
1310 */
1311 static inline int
1312 iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
1313 {
1314 int res;
1315
1316 if ((int)buf->sg.offset >= 0) {
1317 int offset = buf->sg.offset + buf->sent;
1318
1319 /* tcp_sendpage */
1320 res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
1321 } else {
1322 struct msghdr msg;
1323
1324 buf->iov.iov_base = iscsi_buf_iov_base(buf);
1325 buf->iov.iov_len = size;
1326
1327 memset(&msg, 0, sizeof(struct msghdr));
1328
1329 /* tcp_sendmsg */
1330 res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
1331 }
1332
1333 return res;
1334 }
1335
1336 /**
1337 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1338 * @conn: iscsi connection
1339 * @buf: buffer to write from
1340 * @datalen: lenght of data to be sent after the header
1341 *
1342 * Notes:
1343 * (Tx, Fast Path)
1344 **/
1345 static inline int
1346 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1347 {
1348 struct socket *sk = conn->sock;
1349 int flags = 0; /* MSG_DONTWAIT; */
1350 int res, size;
1351
1352 size = buf->sg.length - buf->sent;
1353 BUG_ON(buf->sent + size > buf->sg.length);
1354 if (buf->sent + size != buf->sg.length || datalen)
1355 flags |= MSG_MORE;
1356
1357 res = iscsi_send(sk, buf, size, flags);
1358 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1359 if (res >= 0) {
1360 conn->txdata_octets += res;
1361 buf->sent += res;
1362 if (size != res)
1363 return -EAGAIN;
1364 return 0;
1365 } else if (res == -EAGAIN) {
1366 conn->sendpage_failures_cnt++;
1367 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1368 } else if (res == -EPIPE)
1369 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1370
1371 return res;
1372 }
1373
1374 /**
1375 * iscsi_sendpage - send one page of iSCSI Data-Out.
1376 * @conn: iscsi connection
1377 * @buf: buffer to write from
1378 * @count: remaining data
1379 * @sent: number of bytes sent
1380 *
1381 * Notes:
1382 * (Tx, Fast Path)
1383 **/
1384 static inline int
1385 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1386 int *count, int *sent)
1387 {
1388 struct socket *sk = conn->sock;
1389 int flags = 0; /* MSG_DONTWAIT; */
1390 int res, size;
1391
1392 size = buf->sg.length - buf->sent;
1393 BUG_ON(buf->sent + size > buf->sg.length);
1394 if (size > *count)
1395 size = *count;
1396 if (buf->sent + size != buf->sg.length || *count != size)
1397 flags |= MSG_MORE;
1398
1399 res = iscsi_send(sk, buf, size, flags);
1400 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1401 size, buf->sent, *count, *sent, res);
1402 if (res >= 0) {
1403 conn->txdata_octets += res;
1404 buf->sent += res;
1405 *count -= res;
1406 *sent += res;
1407 if (size != res)
1408 return -EAGAIN;
1409 return 0;
1410 } else if (res == -EAGAIN) {
1411 conn->sendpage_failures_cnt++;
1412 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1413 } else if (res == -EPIPE)
1414 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1415
1416 return res;
1417 }
1418
1419 static inline void
1420 iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1421 {
1422 BUG_ON(!conn->data_tx_tfm);
1423 crypto_digest_init(conn->data_tx_tfm);
1424 ctask->digest_count = 4;
1425 }
1426
1427 static inline void
1428 iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
1429 {
1430 struct scatterlist sg;
1431
1432 if (buf->sg.offset != -1)
1433 crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
1434 else {
1435 sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
1436 crypto_digest_update(conn->data_tx_tfm, &sg, 1);
1437 }
1438 }
1439
1440 static inline int
1441 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1442 struct iscsi_buf *buf, uint32_t *digest, int final)
1443 {
1444 int rc = 0;
1445 int sent = 0;
1446
1447 if (final)
1448 crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
1449
1450 iscsi_buf_init_virt(buf, (char*)digest, 4);
1451 rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
1452 if (rc) {
1453 ctask->datadigest = *digest;
1454 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1455 } else
1456 ctask->digest_count = 4;
1457 return rc;
1458 }
1459
1460 /**
1461 * iscsi_solicit_data_cont - initialize next Data-Out
1462 * @conn: iscsi connection
1463 * @ctask: scsi command task
1464 * @r2t: R2T info
1465 * @left: bytes left to transfer
1466 *
1467 * Notes:
1468 * Initialize next Data-Out within this R2T sequence and continue
1469 * to process next Scatter-Gather element(if any) of this SCSI command.
1470 *
1471 * Called under connection lock.
1472 **/
1473 static void
1474 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1475 struct iscsi_r2t_info *r2t, int left)
1476 {
1477 struct iscsi_data *hdr;
1478 struct iscsi_data_task *dtask;
1479 struct scsi_cmnd *sc = ctask->sc;
1480 int new_offset;
1481
1482 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1483 BUG_ON(!dtask);
1484 hdr = &dtask->hdr;
1485 memset(hdr, 0, sizeof(struct iscsi_data));
1486 hdr->ttt = r2t->ttt;
1487 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1488 r2t->solicit_datasn++;
1489 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1490 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1491 hdr->itt = ctask->hdr.itt;
1492 hdr->exp_statsn = r2t->exp_statsn;
1493 new_offset = r2t->data_offset + r2t->sent;
1494 hdr->offset = cpu_to_be32(new_offset);
1495 if (left > conn->max_xmit_dlength) {
1496 hton24(hdr->dlength, conn->max_xmit_dlength);
1497 r2t->data_count = conn->max_xmit_dlength;
1498 } else {
1499 hton24(hdr->dlength, left);
1500 r2t->data_count = left;
1501 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1502 }
1503 conn->dataout_pdus_cnt++;
1504
1505 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
1506 sizeof(struct iscsi_hdr));
1507
1508 r2t->dtask = dtask;
1509
1510 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1511 BUG_ON(ctask->bad_sg == r2t->sg);
1512 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1513 r2t->sg += 1;
1514 } else
1515 iscsi_buf_init_iov(&ctask->sendbuf,
1516 (char*)sc->request_buffer + new_offset,
1517 r2t->data_count);
1518
1519 list_add(&dtask->item, &ctask->dataqueue);
1520 }
1521
1522 static void
1523 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1524 {
1525 struct iscsi_data *hdr;
1526 struct iscsi_data_task *dtask;
1527
1528 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1529 BUG_ON(!dtask);
1530 hdr = &dtask->hdr;
1531 memset(hdr, 0, sizeof(struct iscsi_data));
1532 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
1533 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
1534 ctask->unsol_datasn++;
1535 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1536 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1537 hdr->itt = ctask->hdr.itt;
1538 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
1539 hdr->offset = cpu_to_be32(ctask->total_length -
1540 ctask->r2t_data_count -
1541 ctask->unsol_count);
1542 if (ctask->unsol_count > conn->max_xmit_dlength) {
1543 hton24(hdr->dlength, conn->max_xmit_dlength);
1544 ctask->data_count = conn->max_xmit_dlength;
1545 hdr->flags = 0;
1546 } else {
1547 hton24(hdr->dlength, ctask->unsol_count);
1548 ctask->data_count = ctask->unsol_count;
1549 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1550 }
1551
1552 iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
1553 sizeof(struct iscsi_hdr));
1554
1555 list_add(&dtask->item, &ctask->dataqueue);
1556
1557 ctask->dtask = dtask;
1558 }
1559
1560 /**
1561 * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1562 * @conn: iscsi connection
1563 * @ctask: scsi command task
1564 * @sc: scsi command
1565 **/
1566 static void
1567 iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1568 struct scsi_cmnd *sc)
1569 {
1570 struct iscsi_session *session = conn->session;
1571
1572 BUG_ON(__kfifo_len(ctask->r2tqueue));
1573
1574 ctask->sc = sc;
1575 ctask->conn = conn;
1576 ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
1577 ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
1578 int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
1579 ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
1580 (session->age << AGE_SHIFT);
1581 ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
1582 ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
1583 ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
1584 memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
1585 memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
1586
1587 ctask->mtask = NULL;
1588 ctask->sent = 0;
1589 ctask->sg_count = 0;
1590
1591 ctask->total_length = sc->request_bufflen;
1592
1593 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1594 ctask->exp_r2tsn = 0;
1595 ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
1596 BUG_ON(ctask->total_length == 0);
1597 if (sc->use_sg) {
1598 struct scatterlist *sg = sc->request_buffer;
1599
1600 iscsi_buf_init_sg(&ctask->sendbuf,
1601 &sg[ctask->sg_count++]);
1602 ctask->sg = sg;
1603 ctask->bad_sg = sg + sc->use_sg;
1604 } else {
1605 iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
1606 sc->request_bufflen);
1607 }
1608
1609 /*
1610 * Write counters:
1611 *
1612 * imm_count bytes to be sent right after
1613 * SCSI PDU Header
1614 *
1615 * unsol_count bytes(as Data-Out) to be sent
1616 * without R2T ack right after
1617 * immediate data
1618 *
1619 * r2t_data_count bytes to be sent via R2T ack's
1620 *
1621 * pad_count bytes to be sent as zero-padding
1622 */
1623 ctask->imm_count = 0;
1624 ctask->unsol_count = 0;
1625 ctask->unsol_datasn = 0;
1626 ctask->xmstate = XMSTATE_W_HDR;
1627 /* calculate write padding */
1628 ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1629 if (ctask->pad_count) {
1630 ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
1631 debug_scsi("write padding %d bytes\n",
1632 ctask->pad_count);
1633 ctask->xmstate |= XMSTATE_W_PAD;
1634 }
1635 if (session->imm_data_en) {
1636 if (ctask->total_length >= session->first_burst)
1637 ctask->imm_count = min(session->first_burst,
1638 conn->max_xmit_dlength);
1639 else
1640 ctask->imm_count = min(ctask->total_length,
1641 conn->max_xmit_dlength);
1642 hton24(ctask->hdr.dlength, ctask->imm_count);
1643 ctask->xmstate |= XMSTATE_IMM_DATA;
1644 } else
1645 zero_data(ctask->hdr.dlength);
1646
1647 if (!session->initial_r2t_en)
1648 ctask->unsol_count = min(session->first_burst,
1649 ctask->total_length) - ctask->imm_count;
1650 if (!ctask->unsol_count)
1651 /* No unsolicit Data-Out's */
1652 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1653 else
1654 ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1655
1656 ctask->r2t_data_count = ctask->total_length -
1657 ctask->imm_count -
1658 ctask->unsol_count;
1659
1660 debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
1661 "r2t_data %d]\n",
1662 ctask->itt, ctask->total_length, ctask->imm_count,
1663 ctask->unsol_count, ctask->r2t_data_count);
1664 } else {
1665 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1666 if (sc->sc_data_direction == DMA_FROM_DEVICE)
1667 ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
1668 ctask->datasn = 0;
1669 ctask->xmstate = XMSTATE_R_HDR;
1670 zero_data(ctask->hdr.dlength);
1671 }
1672
1673 iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
1674 sizeof(struct iscsi_hdr));
1675 conn->scsicmd_pdus_cnt++;
1676 }
1677
1678 /**
1679 * iscsi_mtask_xmit - xmit management(immediate) task
1680 * @conn: iscsi connection
1681 * @mtask: task management task
1682 *
1683 * Notes:
1684 * The function can return -EAGAIN in which case caller must
1685 * call it again later, or recover. '0' return code means successful
1686 * xmit.
1687 *
1688 * Management xmit state machine consists of two states:
1689 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1690 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1691 **/
1692 static int
1693 iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1694 {
1695
1696 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1697 conn->id, mtask->xmstate, mtask->itt);
1698
1699 if (mtask->xmstate & XMSTATE_IMM_HDR) {
1700 mtask->xmstate &= ~XMSTATE_IMM_HDR;
1701 if (mtask->data_count)
1702 mtask->xmstate |= XMSTATE_IMM_DATA;
1703 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1704 conn->stop_stage != STOP_CONN_RECOVER &&
1705 conn->hdrdgst_en)
1706 iscsi_hdr_digest(conn, &mtask->headbuf,
1707 (u8*)mtask->hdrext);
1708 if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
1709 mtask->xmstate |= XMSTATE_IMM_HDR;
1710 if (mtask->data_count)
1711 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1712 return -EAGAIN;
1713 }
1714 }
1715
1716 if (mtask->xmstate & XMSTATE_IMM_DATA) {
1717 BUG_ON(!mtask->data_count);
1718 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1719 /* FIXME: implement.
1720 * Virtual buffer could be spreaded across multiple pages...
1721 */
1722 do {
1723 if (iscsi_sendpage(conn, &mtask->sendbuf,
1724 &mtask->data_count, &mtask->sent)) {
1725 mtask->xmstate |= XMSTATE_IMM_DATA;
1726 return -EAGAIN;
1727 }
1728 } while (mtask->data_count);
1729 }
1730
1731 BUG_ON(mtask->xmstate != XMSTATE_IDLE);
1732 return 0;
1733 }
1734
1735 static inline int
1736 handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1737 {
1738 ctask->xmstate &= ~XMSTATE_R_HDR;
1739 if (conn->hdrdgst_en)
1740 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1741 if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
1742 BUG_ON(ctask->xmstate != XMSTATE_IDLE);
1743 return 0; /* wait for Data-In */
1744 }
1745 ctask->xmstate |= XMSTATE_R_HDR;
1746 return -EAGAIN;
1747 }
1748
1749 static inline int
1750 handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1751 {
1752 ctask->xmstate &= ~XMSTATE_W_HDR;
1753 if (conn->hdrdgst_en)
1754 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1755 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
1756 ctask->xmstate |= XMSTATE_W_HDR;
1757 return -EAGAIN;
1758 }
1759 return 0;
1760 }
1761
1762 static inline int
1763 handle_xmstate_data_digest(struct iscsi_conn *conn,
1764 struct iscsi_cmd_task *ctask)
1765 {
1766 ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1767 debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
1768 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1769 &ctask->datadigest, 0)) {
1770 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1771 debug_tcp("resent data digest 0x%x fail!\n",
1772 ctask->datadigest);
1773 return -EAGAIN;
1774 }
1775 return 0;
1776 }
1777
1778 static inline int
1779 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1780 {
1781 BUG_ON(!ctask->imm_count);
1782 ctask->xmstate &= ~XMSTATE_IMM_DATA;
1783
1784 if (conn->datadgst_en) {
1785 iscsi_data_digest_init(conn, ctask);
1786 ctask->immdigest = 0;
1787 }
1788
1789 for (;;) {
1790 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
1791 &ctask->sent)) {
1792 ctask->xmstate |= XMSTATE_IMM_DATA;
1793 if (conn->datadgst_en) {
1794 crypto_digest_final(conn->data_tx_tfm,
1795 (u8*)&ctask->immdigest);
1796 debug_tcp("tx imm sendpage fail 0x%x\n",
1797 ctask->datadigest);
1798 }
1799 return -EAGAIN;
1800 }
1801 if (conn->datadgst_en)
1802 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1803
1804 if (!ctask->imm_count)
1805 break;
1806 iscsi_buf_init_sg(&ctask->sendbuf,
1807 &ctask->sg[ctask->sg_count++]);
1808 }
1809
1810 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1811 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1812 &ctask->immdigest, 1)) {
1813 debug_tcp("sending imm digest 0x%x fail!\n",
1814 ctask->immdigest);
1815 return -EAGAIN;
1816 }
1817 debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
1818 }
1819
1820 return 0;
1821 }
1822
1823 static inline int
1824 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1825 {
1826 struct iscsi_data_task *dtask;
1827
1828 ctask->xmstate |= XMSTATE_UNS_DATA;
1829 if (ctask->xmstate & XMSTATE_UNS_INIT) {
1830 iscsi_unsolicit_data_init(conn, ctask);
1831 BUG_ON(!ctask->dtask);
1832 dtask = ctask->dtask;
1833 if (conn->hdrdgst_en)
1834 iscsi_hdr_digest(conn, &ctask->headbuf,
1835 (u8*)dtask->hdrext);
1836 ctask->xmstate &= ~XMSTATE_UNS_INIT;
1837 }
1838 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
1839 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1840 ctask->xmstate |= XMSTATE_UNS_HDR;
1841 return -EAGAIN;
1842 }
1843
1844 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1845 ctask->itt, ctask->unsol_count, ctask->sent);
1846 return 0;
1847 }
1848
1849 static inline int
1850 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1851 {
1852 struct iscsi_data_task *dtask = ctask->dtask;
1853
1854 BUG_ON(!ctask->data_count);
1855 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1856
1857 if (conn->datadgst_en) {
1858 iscsi_data_digest_init(conn, ctask);
1859 dtask->digest = 0;
1860 }
1861
1862 for (;;) {
1863 int start = ctask->sent;
1864
1865 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
1866 &ctask->sent)) {
1867 ctask->unsol_count -= ctask->sent - start;
1868 ctask->xmstate |= XMSTATE_UNS_DATA;
1869 /* will continue with this ctask later.. */
1870 if (conn->datadgst_en) {
1871 crypto_digest_final(conn->data_tx_tfm,
1872 (u8 *)&dtask->digest);
1873 debug_tcp("tx uns data fail 0x%x\n",
1874 dtask->digest);
1875 }
1876 return -EAGAIN;
1877 }
1878
1879 BUG_ON(ctask->sent > ctask->total_length);
1880 ctask->unsol_count -= ctask->sent - start;
1881
1882 /*
1883 * XXX:we may run here with un-initial sendbuf.
1884 * so pass it
1885 */
1886 if (conn->datadgst_en && ctask->sent - start > 0)
1887 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1888
1889 if (!ctask->data_count)
1890 break;
1891 iscsi_buf_init_sg(&ctask->sendbuf,
1892 &ctask->sg[ctask->sg_count++]);
1893 }
1894 BUG_ON(ctask->unsol_count < 0);
1895
1896 /*
1897 * Done with the Data-Out. Next, check if we need
1898 * to send another unsolicited Data-Out.
1899 */
1900 if (ctask->unsol_count) {
1901 if (conn->datadgst_en) {
1902 if (iscsi_digest_final_send(conn, ctask,
1903 &dtask->digestbuf,
1904 &dtask->digest, 1)) {
1905 debug_tcp("send uns digest 0x%x fail\n",
1906 dtask->digest);
1907 return -EAGAIN;
1908 }
1909 debug_tcp("sending uns digest 0x%x, more uns\n",
1910 dtask->digest);
1911 }
1912 ctask->xmstate |= XMSTATE_UNS_INIT;
1913 return 1;
1914 }
1915
1916 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1917 if (iscsi_digest_final_send(conn, ctask,
1918 &dtask->digestbuf,
1919 &dtask->digest, 1)) {
1920 debug_tcp("send last uns digest 0x%x fail\n",
1921 dtask->digest);
1922 return -EAGAIN;
1923 }
1924 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1925 }
1926
1927 return 0;
1928 }
1929
1930 static inline int
1931 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1932 {
1933 struct iscsi_session *session = conn->session;
1934 struct iscsi_r2t_info *r2t = ctask->r2t;
1935 struct iscsi_data_task *dtask = r2t->dtask;
1936 int left;
1937
1938 ctask->xmstate &= ~XMSTATE_SOL_DATA;
1939 ctask->dtask = dtask;
1940
1941 if (conn->datadgst_en) {
1942 iscsi_data_digest_init(conn, ctask);
1943 dtask->digest = 0;
1944 }
1945 solicit_again:
1946 /*
1947 * send Data-Out whitnin this R2T sequence.
1948 */
1949 if (!r2t->data_count)
1950 goto data_out_done;
1951
1952 if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
1953 ctask->xmstate |= XMSTATE_SOL_DATA;
1954 /* will continue with this ctask later.. */
1955 if (conn->datadgst_en) {
1956 crypto_digest_final(conn->data_tx_tfm,
1957 (u8 *)&dtask->digest);
1958 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1959 }
1960 return -EAGAIN;
1961 }
1962
1963 BUG_ON(r2t->data_count < 0);
1964 if (conn->datadgst_en)
1965 iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
1966
1967 if (r2t->data_count) {
1968 BUG_ON(ctask->sc->use_sg == 0);
1969 if (!iscsi_buf_left(&r2t->sendbuf)) {
1970 BUG_ON(ctask->bad_sg == r2t->sg);
1971 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1972 r2t->sg += 1;
1973 }
1974 goto solicit_again;
1975 }
1976
1977 data_out_done:
1978 /*
1979 * Done with this Data-Out. Next, check if we have
1980 * to send another Data-Out for this R2T.
1981 */
1982 BUG_ON(r2t->data_length - r2t->sent < 0);
1983 left = r2t->data_length - r2t->sent;
1984 if (left) {
1985 if (conn->datadgst_en) {
1986 if (iscsi_digest_final_send(conn, ctask,
1987 &dtask->digestbuf,
1988 &dtask->digest, 1)) {
1989 debug_tcp("send r2t data digest 0x%x"
1990 "fail\n", dtask->digest);
1991 return -EAGAIN;
1992 }
1993 debug_tcp("r2t data send digest 0x%x\n",
1994 dtask->digest);
1995 }
1996 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1997 ctask->xmstate |= XMSTATE_SOL_DATA;
1998 ctask->xmstate &= ~XMSTATE_SOL_HDR;
1999 return 1;
2000 }
2001
2002 /*
2003 * Done with this R2T. Check if there are more
2004 * outstanding R2Ts ready to be processed.
2005 */
2006 BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
2007 if (conn->datadgst_en) {
2008 if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
2009 &dtask->digest, 1)) {
2010 debug_tcp("send last r2t data digest 0x%x"
2011 "fail\n", dtask->digest);
2012 return -EAGAIN;
2013 }
2014 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
2015 }
2016
2017 ctask->r2t_data_count -= r2t->data_length;
2018 ctask->r2t = NULL;
2019 spin_lock_bh(&session->lock);
2020 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
2021 spin_unlock_bh(&session->lock);
2022 if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
2023 ctask->r2t = r2t;
2024 ctask->xmstate |= XMSTATE_SOL_DATA;
2025 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2026 return 1;
2027 }
2028
2029 return 0;
2030 }
2031
2032 static inline int
2033 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2034 {
2035 struct iscsi_data_task *dtask = ctask->dtask;
2036 int sent;
2037
2038 ctask->xmstate &= ~XMSTATE_W_PAD;
2039 iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
2040 ctask->pad_count);
2041 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
2042 ctask->xmstate |= XMSTATE_W_PAD;
2043 return -EAGAIN;
2044 }
2045
2046 if (conn->datadgst_en) {
2047 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
2048 /* imm data? */
2049 if (!dtask) {
2050 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
2051 &ctask->immdigest, 1)) {
2052 debug_tcp("send padding digest 0x%x"
2053 "fail!\n", ctask->immdigest);
2054 return -EAGAIN;
2055 }
2056 debug_tcp("done with padding, digest 0x%x\n",
2057 ctask->datadigest);
2058 } else {
2059 if (iscsi_digest_final_send(conn, ctask,
2060 &dtask->digestbuf,
2061 &dtask->digest, 1)) {
2062 debug_tcp("send padding digest 0x%x"
2063 "fail\n", dtask->digest);
2064 return -EAGAIN;
2065 }
2066 debug_tcp("done with padding, digest 0x%x\n",
2067 dtask->digest);
2068 }
2069 }
2070
2071 return 0;
2072 }
2073
2074 static int
2075 iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2076 {
2077 int rc = 0;
2078
2079 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
2080 conn->id, ctask->xmstate, ctask->itt);
2081
2082 /*
2083 * serialize with TMF AbortTask
2084 */
2085 if (ctask->mtask)
2086 return rc;
2087
2088 if (ctask->xmstate & XMSTATE_R_HDR) {
2089 rc = handle_xmstate_r_hdr(conn, ctask);
2090 return rc;
2091 }
2092
2093 if (ctask->xmstate & XMSTATE_W_HDR) {
2094 rc = handle_xmstate_w_hdr(conn, ctask);
2095 if (rc)
2096 return rc;
2097 }
2098
2099 /* XXX: for data digest xmit recover */
2100 if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
2101 rc = handle_xmstate_data_digest(conn, ctask);
2102 if (rc)
2103 return rc;
2104 }
2105
2106 if (ctask->xmstate & XMSTATE_IMM_DATA) {
2107 rc = handle_xmstate_imm_data(conn, ctask);
2108 if (rc)
2109 return rc;
2110 }
2111
2112 if (ctask->xmstate & XMSTATE_UNS_HDR) {
2113 BUG_ON(!ctask->unsol_count);
2114 ctask->xmstate &= ~XMSTATE_UNS_HDR;
2115 unsolicit_head_again:
2116 rc = handle_xmstate_uns_hdr(conn, ctask);
2117 if (rc)
2118 return rc;
2119 }
2120
2121 if (ctask->xmstate & XMSTATE_UNS_DATA) {
2122 rc = handle_xmstate_uns_data(conn, ctask);
2123 if (rc == 1)
2124 goto unsolicit_head_again;
2125 else if (rc)
2126 return rc;
2127 goto done;
2128 }
2129
2130 if (ctask->xmstate & XMSTATE_SOL_HDR) {
2131 struct iscsi_r2t_info *r2t;
2132
2133 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2134 ctask->xmstate |= XMSTATE_SOL_DATA;
2135 if (!ctask->r2t)
2136 __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
2137 sizeof(void*));
2138 solicit_head_again:
2139 r2t = ctask->r2t;
2140 if (conn->hdrdgst_en)
2141 iscsi_hdr_digest(conn, &r2t->headbuf,
2142 (u8*)r2t->dtask->hdrext);
2143 if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
2144 ctask->xmstate &= ~XMSTATE_SOL_DATA;
2145 ctask->xmstate |= XMSTATE_SOL_HDR;
2146 return -EAGAIN;
2147 }
2148
2149 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
2150 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
2151 r2t->sent);
2152 }
2153
2154 if (ctask->xmstate & XMSTATE_SOL_DATA) {
2155 rc = handle_xmstate_sol_data(conn, ctask);
2156 if (rc == 1)
2157 goto solicit_head_again;
2158 if (rc)
2159 return rc;
2160 }
2161
2162 done:
2163 /*
2164 * Last thing to check is whether we need to send write
2165 * padding. Note that we check for xmstate equality, not just the bit.
2166 */
2167 if (ctask->xmstate == XMSTATE_W_PAD)
2168 rc = handle_xmstate_w_pad(conn, ctask);
2169
2170 return rc;
2171 }
2172
2173 /**
2174 * iscsi_data_xmit - xmit any command into the scheduled connection
2175 * @conn: iscsi connection
2176 *
2177 * Notes:
2178 * The function can return -EAGAIN in which case the caller must
2179 * re-schedule it again later or recover. '0' return code means
2180 * successful xmit.
2181 **/
2182 static int
2183 iscsi_data_xmit(struct iscsi_conn *conn)
2184 {
2185 if (unlikely(conn->suspend_tx)) {
2186 debug_tcp("conn %d Tx suspended!\n", conn->id);
2187 return 0;
2188 }
2189
2190 /*
2191 * Transmit in the following order:
2192 *
2193 * 1) un-finished xmit (ctask or mtask)
2194 * 2) immediate control PDUs
2195 * 3) write data
2196 * 4) SCSI commands
2197 * 5) non-immediate control PDUs
2198 *
2199 * No need to lock around __kfifo_get as long as
2200 * there's one producer and one consumer.
2201 */
2202
2203 BUG_ON(conn->ctask && conn->mtask);
2204
2205 if (conn->ctask) {
2206 if (iscsi_ctask_xmit(conn, conn->ctask))
2207 goto again;
2208 /* done with this in-progress ctask */
2209 conn->ctask = NULL;
2210 }
2211 if (conn->mtask) {
2212 if (iscsi_mtask_xmit(conn, conn->mtask))
2213 goto again;
2214 /* done with this in-progress mtask */
2215 conn->mtask = NULL;
2216 }
2217
2218 /* process immediate first */
2219 if (unlikely(__kfifo_len(conn->immqueue))) {
2220 struct iscsi_session *session = conn->session;
2221 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
2222 sizeof(void*))) {
2223 if (iscsi_mtask_xmit(conn, conn->mtask))
2224 goto again;
2225
2226 if (conn->mtask->hdr.itt ==
2227 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2228 spin_lock_bh(&session->lock);
2229 __kfifo_put(session->mgmtpool.queue,
2230 (void*)&conn->mtask, sizeof(void*));
2231 spin_unlock_bh(&session->lock);
2232 }
2233 }
2234 /* done with this mtask */
2235 conn->mtask = NULL;
2236 }
2237
2238 /* process write queue */
2239 while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
2240 sizeof(void*))) {
2241 if (iscsi_ctask_xmit(conn, conn->ctask))
2242 goto again;
2243 }
2244
2245 /* process command queue */
2246 while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
2247 sizeof(void*))) {
2248 if (iscsi_ctask_xmit(conn, conn->ctask))
2249 goto again;
2250 }
2251 /* done with this ctask */
2252 conn->ctask = NULL;
2253
2254 /* process the rest control plane PDUs, if any */
2255 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
2256 struct iscsi_session *session = conn->session;
2257
2258 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
2259 sizeof(void*))) {
2260 if (iscsi_mtask_xmit(conn, conn->mtask))
2261 goto again;
2262
2263 if (conn->mtask->hdr.itt ==
2264 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2265 spin_lock_bh(&session->lock);
2266 __kfifo_put(session->mgmtpool.queue,
2267 (void*)&conn->mtask,
2268 sizeof(void*));
2269 spin_unlock_bh(&session->lock);
2270 }
2271 }
2272 /* done with this mtask */
2273 conn->mtask = NULL;
2274 }
2275
2276 return 0;
2277
2278 again:
2279 if (unlikely(conn->suspend_tx))
2280 return 0;
2281
2282 return -EAGAIN;
2283 }
2284
2285 static void
2286 iscsi_xmitworker(void *data)
2287 {
2288 struct iscsi_conn *conn = data;
2289
2290 /*
2291 * serialize Xmit worker on a per-connection basis.
2292 */
2293 down(&conn->xmitsema);
2294 if (iscsi_data_xmit(conn))
2295 schedule_work(&conn->xmitwork);
2296 up(&conn->xmitsema);
2297 }
2298
2299 #define FAILURE_BAD_HOST 1
2300 #define FAILURE_SESSION_FAILED 2
2301 #define FAILURE_SESSION_FREED 3
2302 #define FAILURE_WINDOW_CLOSED 4
2303 #define FAILURE_SESSION_TERMINATE 5
2304
2305 static int
2306 iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
2307 {
2308 struct Scsi_Host *host;
2309 int reason = 0;
2310 struct iscsi_session *session;
2311 struct iscsi_conn *conn = NULL;
2312 struct iscsi_cmd_task *ctask = NULL;
2313
2314 sc->scsi_done = done;
2315 sc->result = 0;
2316
2317 host = sc->device->host;
2318 session = iscsi_hostdata(host->hostdata);
2319 BUG_ON(host != session->host);
2320
2321 spin_lock(&session->lock);
2322
2323 if (session->state != ISCSI_STATE_LOGGED_IN) {
2324 if (session->state == ISCSI_STATE_FAILED) {
2325 reason = FAILURE_SESSION_FAILED;
2326 goto reject;
2327 } else if (session->state == ISCSI_STATE_TERMINATE) {
2328 reason = FAILURE_SESSION_TERMINATE;
2329 goto fault;
2330 }
2331 reason = FAILURE_SESSION_FREED;
2332 goto fault;
2333 }
2334
2335 /*
2336 * Check for iSCSI window and take care of CmdSN wrap-around
2337 */
2338 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
2339 reason = FAILURE_WINDOW_CLOSED;
2340 goto reject;
2341 }
2342
2343 conn = session->leadconn;
2344
2345 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
2346 BUG_ON(ctask->sc);
2347
2348 sc->SCp.phase = session->age;
2349 sc->SCp.ptr = (char*)ctask;
2350 iscsi_cmd_init(conn, ctask, sc);
2351
2352 __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
2353 debug_scsi(
2354 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
2355 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
2356 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
2357 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
2358 spin_unlock(&session->lock);
2359
2360 if (!in_interrupt() && !down_trylock(&conn->xmitsema)) {
2361 spin_unlock_irq(host->host_lock);
2362 if (iscsi_data_xmit(conn))
2363 schedule_work(&conn->xmitwork);
2364 up(&conn->xmitsema);
2365 spin_lock_irq(host->host_lock);
2366 } else
2367 schedule_work(&conn->xmitwork);
2368
2369 return 0;
2370
2371 reject:
2372 spin_unlock(&session->lock);
2373 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
2374 return SCSI_MLQUEUE_HOST_BUSY;
2375
2376 fault:
2377 spin_unlock(&session->lock);
2378 printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
2379 sc->cmnd[0], reason);
2380 sc->sense_buffer[0] = 0x70;
2381 sc->sense_buffer[2] = NOT_READY;
2382 sc->sense_buffer[7] = 0x6;
2383 sc->sense_buffer[12] = 0x08;
2384 sc->sense_buffer[13] = 0x00;
2385 sc->result = (DID_NO_CONNECT << 16);
2386 sc->resid = sc->request_bufflen;
2387 sc->scsi_done(sc);
2388 return 0;
2389 }
2390
2391 static int
2392 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
2393 {
2394 int i;
2395
2396 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
2397 if (*items == NULL)
2398 return -ENOMEM;
2399
2400 q->max = max;
2401 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
2402 if (q->pool == NULL) {
2403 kfree(*items);
2404 return -ENOMEM;
2405 }
2406
2407 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2408 GFP_KERNEL, NULL);
2409 if (q->queue == ERR_PTR(-ENOMEM)) {
2410 kfree(q->pool);
2411 kfree(*items);
2412 return -ENOMEM;
2413 }
2414
2415 for (i = 0; i < max; i++) {
2416 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
2417 if (q->pool[i] == NULL) {
2418 int j;
2419
2420 for (j = 0; j < i; j++)
2421 kfree(q->pool[j]);
2422
2423 kfifo_free(q->queue);
2424 kfree(q->pool);
2425 kfree(*items);
2426 return -ENOMEM;
2427 }
2428 memset(q->pool[i], 0, item_size);
2429 (*items)[i] = q->pool[i];
2430 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2431 }
2432 return 0;
2433 }
2434
2435 static void
2436 iscsi_pool_free(struct iscsi_queue *q, void **items)
2437 {
2438 int i;
2439
2440 for (i = 0; i < q->max; i++)
2441 kfree(items[i]);
2442 kfree(q->pool);
2443 kfree(items);
2444 }
2445
2446 static iscsi_connh_t
2447 iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
2448 {
2449 struct iscsi_session *session = iscsi_ptr(sessionh);
2450 struct iscsi_conn *conn = NULL;
2451
2452 conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
2453 if (conn == NULL)
2454 goto conn_alloc_fail;
2455 memset(conn, 0, sizeof(struct iscsi_conn));
2456
2457 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2458 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2459 conn->id = conn_idx;
2460 conn->exp_statsn = 0;
2461 conn->tmabort_state = TMABORT_INITIAL;
2462
2463 /* initial operational parameters */
2464 conn->hdr_size = sizeof(struct iscsi_hdr);
2465 conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2466 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2467
2468 spin_lock_init(&conn->lock);
2469
2470 /* initialize general xmit PDU commands queue */
2471 conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
2472 GFP_KERNEL, NULL);
2473 if (conn->xmitqueue == ERR_PTR(-ENOMEM))
2474 goto xmitqueue_alloc_fail;
2475
2476 /* initialize write response PDU commands queue */
2477 conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
2478 GFP_KERNEL, NULL);
2479 if (conn->writequeue == ERR_PTR(-ENOMEM))
2480 goto writequeue_alloc_fail;
2481
2482 /* initialize general immediate & non-immediate PDU commands queue */
2483 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2484 GFP_KERNEL, NULL);
2485 if (conn->immqueue == ERR_PTR(-ENOMEM))
2486 goto immqueue_alloc_fail;
2487
2488 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2489 GFP_KERNEL, NULL);
2490 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
2491 goto mgmtqueue_alloc_fail;
2492
2493 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
2494
2495 /* allocate login_mtask used for the login/text sequences */
2496 spin_lock_bh(&session->lock);
2497 if (!__kfifo_get(session->mgmtpool.queue,
2498 (void*)&conn->login_mtask,
2499 sizeof(void*))) {
2500 spin_unlock_bh(&session->lock);
2501 goto login_mtask_alloc_fail;
2502 }
2503 spin_unlock_bh(&session->lock);
2504
2505 /* allocate initial PDU receive place holder */
2506 if (conn->data_size <= PAGE_SIZE)
2507 conn->data = kmalloc(conn->data_size, GFP_KERNEL);
2508 else
2509 conn->data = (void*)__get_free_pages(GFP_KERNEL,
2510 get_order(conn->data_size));
2511 if (!conn->data)
2512 goto max_recv_dlenght_alloc_fail;
2513
2514 init_timer(&conn->tmabort_timer);
2515 init_MUTEX(&conn->xmitsema);
2516 init_waitqueue_head(&conn->ehwait);
2517
2518 return iscsi_handle(conn);
2519
2520 max_recv_dlenght_alloc_fail:
2521 spin_lock_bh(&session->lock);
2522 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2523 sizeof(void*));
2524 spin_unlock_bh(&session->lock);
2525 login_mtask_alloc_fail:
2526 kfifo_free(conn->mgmtqueue);
2527 mgmtqueue_alloc_fail:
2528 kfifo_free(conn->immqueue);
2529 immqueue_alloc_fail:
2530 kfifo_free(conn->writequeue);
2531 writequeue_alloc_fail:
2532 kfifo_free(conn->xmitqueue);
2533 xmitqueue_alloc_fail:
2534 kfree(conn);
2535 conn_alloc_fail:
2536 return iscsi_handle(NULL);
2537 }
2538
2539 static void
2540 iscsi_conn_destroy(iscsi_connh_t connh)
2541 {
2542 struct iscsi_conn *conn = iscsi_ptr(connh);
2543 struct iscsi_session *session = conn->session;
2544
2545 down(&conn->xmitsema);
2546 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2547 if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
2548 struct sock *sk = conn->sock->sk;
2549
2550 /*
2551 * conn_start() has never been called!
2552 * need to cleanup the socket.
2553 */
2554 write_lock_bh(&sk->sk_callback_lock);
2555 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2556 write_unlock_bh(&sk->sk_callback_lock);
2557
2558 sock_hold(conn->sock->sk);
2559 iscsi_conn_restore_callbacks(conn);
2560 sock_put(conn->sock->sk);
2561 sock_release(conn->sock);
2562 conn->sock = NULL;
2563 }
2564
2565 spin_lock_bh(&session->lock);
2566 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2567 if (session->leadconn == conn) {
2568 /*
2569 * leading connection? then give up on recovery.
2570 */
2571 session->state = ISCSI_STATE_TERMINATE;
2572 wake_up(&conn->ehwait);
2573 }
2574 spin_unlock_bh(&session->lock);
2575
2576 up(&conn->xmitsema);
2577
2578 /*
2579 * Block until all in-progress commands for this connection
2580 * time out or fail.
2581 */
2582 for (;;) {
2583 spin_lock_bh(&conn->lock);
2584 if (!session->host->host_busy) { /* OK for ERL == 0 */
2585 spin_unlock_bh(&conn->lock);
2586 break;
2587 }
2588 spin_unlock_bh(&conn->lock);
2589 msleep_interruptible(500);
2590 printk("conn_destroy(): host_busy %d host_failed %d\n",
2591 session->host->host_busy, session->host->host_failed);
2592 /*
2593 * force eh_abort() to unblock
2594 */
2595 wake_up(&conn->ehwait);
2596 }
2597
2598 /* now free crypto */
2599 if (conn->hdrdgst_en || conn->datadgst_en) {
2600 if (conn->tx_tfm)
2601 crypto_free_tfm(conn->tx_tfm);
2602 if (conn->rx_tfm)
2603 crypto_free_tfm(conn->rx_tfm);
2604 if (conn->data_tx_tfm)
2605 crypto_free_tfm(conn->data_tx_tfm);
2606 if (conn->data_rx_tfm)
2607 crypto_free_tfm(conn->data_rx_tfm);
2608 }
2609
2610 /* free conn->data, size = MaxRecvDataSegmentLength */
2611 if (conn->data_size <= PAGE_SIZE)
2612 kfree(conn->data);
2613 else
2614 free_pages((unsigned long)conn->data,
2615 get_order(conn->data_size));
2616
2617 spin_lock_bh(&session->lock);
2618 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2619 sizeof(void*));
2620 list_del(&conn->item);
2621 if (list_empty(&session->connections))
2622 session->leadconn = NULL;
2623 if (session->leadconn && session->leadconn == conn)
2624 session->leadconn = container_of(session->connections.next,
2625 struct iscsi_conn, item);
2626
2627 if (session->leadconn == NULL)
2628 /* none connections exits.. reset sequencing */
2629 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
2630 spin_unlock_bh(&session->lock);
2631
2632 kfifo_free(conn->xmitqueue);
2633 kfifo_free(conn->writequeue);
2634 kfifo_free(conn->immqueue);
2635 kfifo_free(conn->mgmtqueue);
2636 kfree(conn);
2637 }
2638
2639 static int
2640 iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
2641 uint32_t transport_fd, int is_leading)
2642 {
2643 struct iscsi_session *session = iscsi_ptr(sessionh);
2644 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
2645 struct sock *sk;
2646 struct socket *sock;
2647 int err;
2648
2649 /* lookup for existing socket */
2650 sock = sockfd_lookup(transport_fd, &err);
2651 if (!sock) {
2652 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2653 return -EEXIST;
2654 }
2655
2656 /* lookup for existing connection */
2657 spin_lock_bh(&session->lock);
2658 list_for_each_entry(tmp, &session->connections, item) {
2659 if (tmp == conn) {
2660 if (conn->c_stage != ISCSI_CONN_STOPPED ||
2661 conn->stop_stage == STOP_CONN_TERM) {
2662 printk(KERN_ERR "iscsi_tcp: can't bind "
2663 "non-stopped connection (%d:%d)\n",
2664 conn->c_stage, conn->stop_stage);
2665 spin_unlock_bh(&session->lock);
2666 return -EIO;
2667 }
2668 break;
2669 }
2670 }
2671 if (tmp != conn) {
2672 /* bind new iSCSI connection to session */
2673 conn->session = session;
2674
2675 list_add(&conn->item, &session->connections);
2676 }
2677 spin_unlock_bh(&session->lock);
2678
2679 if (conn->stop_stage != STOP_CONN_SUSPEND) {
2680 /* bind iSCSI connection and socket */
2681 conn->sock = sock;
2682
2683 /* setup Socket parameters */
2684 sk = sock->sk;
2685 sk->sk_reuse = 1;
2686 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2687 sk->sk_allocation = GFP_ATOMIC;
2688
2689 /* FIXME: disable Nagle's algorithm */
2690
2691 /*
2692 * Intercept TCP callbacks for sendfile like receive
2693 * processing.
2694 */
2695 iscsi_conn_set_callbacks(conn);
2696
2697 /*
2698 * set receive state machine into initial state
2699 */
2700 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2701 }
2702
2703 if (is_leading)
2704 session->leadconn = conn;
2705
2706 /*
2707 * Unblock xmitworker(), Login Phase will pass through.
2708 */
2709 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2710 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2711
2712 return 0;
2713 }
2714
2715 static int
2716 iscsi_conn_start(iscsi_connh_t connh)
2717 {
2718 struct iscsi_conn *conn = iscsi_ptr(connh);
2719 struct iscsi_session *session = conn->session;
2720 struct sock *sk;
2721
2722 /* FF phase warming up... */
2723
2724 if (session == NULL) {
2725 printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
2726 return -EPERM;
2727 }
2728
2729 sk = conn->sock->sk;
2730
2731 write_lock_bh(&sk->sk_callback_lock);
2732 spin_lock_bh(&session->lock);
2733 conn->c_stage = ISCSI_CONN_STARTED;
2734 session->state = ISCSI_STATE_LOGGED_IN;
2735
2736 switch(conn->stop_stage) {
2737 case STOP_CONN_RECOVER:
2738 /*
2739 * unblock eh_abort() if it is blocked. re-try all
2740 * commands after successful recovery
2741 */
2742 session->conn_cnt++;
2743 conn->stop_stage = 0;
2744 conn->tmabort_state = TMABORT_INITIAL;
2745 session->age++;
2746 wake_up(&conn->ehwait);
2747 break;
2748 case STOP_CONN_TERM:
2749 session->conn_cnt++;
2750 conn->stop_stage = 0;
2751 break;
2752 case STOP_CONN_SUSPEND:
2753 conn->stop_stage = 0;
2754 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2755 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2756 break;
2757 default:
2758 break;
2759 }
2760 spin_unlock_bh(&session->lock);
2761 write_unlock_bh(&sk->sk_callback_lock);
2762
2763 return 0;
2764 }
2765
2766 static void
2767 iscsi_conn_stop(iscsi_connh_t connh, int flag)
2768 {
2769 struct iscsi_conn *conn = iscsi_ptr(connh);
2770 struct iscsi_session *session = conn->session;
2771 struct sock *sk;
2772 unsigned long flags;
2773
2774 BUG_ON(!conn->sock);
2775 sk = conn->sock->sk;
2776 write_lock_bh(&sk->sk_callback_lock);
2777 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2778 write_unlock_bh(&sk->sk_callback_lock);
2779
2780 down(&conn->xmitsema);
2781
2782 spin_lock_irqsave(session->host->host_lock, flags);
2783 spin_lock(&session->lock);
2784 conn->stop_stage = flag;
2785 conn->c_stage = ISCSI_CONN_STOPPED;
2786 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2787
2788 if (flag != STOP_CONN_SUSPEND)
2789 session->conn_cnt--;
2790
2791 if (session->conn_cnt == 0 || session->leadconn == conn)
2792 session->state = ISCSI_STATE_FAILED;
2793
2794 spin_unlock(&session->lock);
2795 spin_unlock_irqrestore(session->host->host_lock, flags);
2796
2797 if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
2798 struct iscsi_cmd_task *ctask;
2799 struct iscsi_mgmt_task *mtask;
2800
2801 /*
2802 * Socket must go now.
2803 */
2804 sock_hold(conn->sock->sk);
2805 iscsi_conn_restore_callbacks(conn);
2806 sock_put(conn->sock->sk);
2807
2808 /*
2809 * flush xmit queues.
2810 */
2811 spin_lock_bh(&session->lock);
2812 while (__kfifo_get(conn->writequeue, (void*)&ctask,
2813 sizeof(void*)) ||
2814 __kfifo_get(conn->xmitqueue, (void*)&ctask,
2815 sizeof(void*))) {
2816 struct iscsi_r2t_info *r2t;
2817
2818 /*
2819 * flush ctask's r2t queues
2820 */
2821 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
2822 sizeof(void*)))
2823 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
2824 sizeof(void*));
2825
2826 spin_unlock_bh(&session->lock);
2827 local_bh_disable();
2828 iscsi_ctask_cleanup(conn, ctask);
2829 local_bh_enable();
2830 spin_lock_bh(&session->lock);
2831 }
2832 conn->ctask = NULL;
2833 while (__kfifo_get(conn->immqueue, (void*)&mtask,
2834 sizeof(void*)) ||
2835 __kfifo_get(conn->mgmtqueue, (void*)&mtask,
2836 sizeof(void*))) {
2837 __kfifo_put(session->mgmtpool.queue,
2838 (void*)&mtask, sizeof(void*));
2839 }
2840 conn->mtask = NULL;
2841 spin_unlock_bh(&session->lock);
2842
2843 /*
2844 * release socket only after we stopped data_xmit()
2845 * activity and flushed all outstandings
2846 */
2847 sock_release(conn->sock);
2848 conn->sock = NULL;
2849
2850 /*
2851 * for connection level recovery we should not calculate
2852 * header digest. conn->hdr_size used for optimization
2853 * in hdr_extract() and will be re-negotiated at
2854 * set_param() time.
2855 */
2856 if (flag == STOP_CONN_RECOVER)
2857 conn->hdr_size = sizeof(struct iscsi_hdr);
2858 }
2859 up(&conn->xmitsema);
2860 }
2861
2862 static int
2863 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
2864 char *data, uint32_t data_size)
2865 {
2866 struct iscsi_session *session = conn->session;
2867 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
2868 struct iscsi_mgmt_task *mtask;
2869
2870 spin_lock_bh(&session->lock);
2871 if (session->state == ISCSI_STATE_TERMINATE) {
2872 spin_unlock_bh(&session->lock);
2873 return -EPERM;
2874 }
2875 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
2876 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
2877 /*
2878 * Login and Text are sent serially, in
2879 * request-followed-by-response sequence.
2880 * Same mtask can be used. Same ITT must be used.
2881 * Note that login_mtask is preallocated at conn_create().
2882 */
2883 mtask = conn->login_mtask;
2884 else {
2885 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
2886 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
2887
2888 if (!__kfifo_get(session->mgmtpool.queue,
2889 (void*)&mtask, sizeof(void*))) {
2890 spin_unlock_bh(&session->lock);
2891 return -ENOSPC;
2892 }
2893 }
2894
2895 /*
2896 * pre-format CmdSN and ExpStatSN for outgoing PDU.
2897 */
2898 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
2899 hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
2900 (session->age << AGE_SHIFT);
2901 nop->cmdsn = cpu_to_be32(session->cmdsn);
2902 if (conn->c_stage == ISCSI_CONN_STARTED &&
2903 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2904 session->cmdsn++;
2905 } else
2906 /* do not advance CmdSN */
2907 nop->cmdsn = cpu_to_be32(session->cmdsn);
2908
2909 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
2910
2911 memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
2912
2913 iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
2914 sizeof(struct iscsi_hdr));
2915
2916 spin_unlock_bh(&session->lock);
2917
2918 if (data_size) {
2919 memcpy(mtask->data, data, data_size);
2920 mtask->data_count = data_size;
2921 } else
2922 mtask->data_count = 0;
2923
2924 mtask->xmstate = XMSTATE_IMM_HDR;
2925
2926 if (mtask->data_count) {
2927 iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
2928 mtask->data_count);
2929 }
2930
2931 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
2932 hdr->opcode, hdr->itt, data_size);
2933
2934 /*
2935 * since send_pdu() could be called at least from two contexts,
2936 * we need to serialize __kfifo_put, so we don't have to take
2937 * additional lock on fast data-path
2938 */
2939 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
2940 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
2941 else
2942 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
2943
2944 schedule_work(&conn->xmitwork);
2945
2946 return 0;
2947 }
2948
2949 static int
2950 iscsi_eh_host_reset(struct scsi_cmnd *sc)
2951 {
2952 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2953 struct iscsi_conn *conn = ctask->conn;
2954 struct iscsi_session *session = conn->session;
2955
2956 spin_lock_bh(&session->lock);
2957 if (session->state == ISCSI_STATE_TERMINATE) {
2958 debug_scsi("failing host reset: session terminated "
2959 "[CID %d age %d]", conn->id, session->age);
2960 spin_unlock_bh(&session->lock);
2961 return FAILED;
2962 }
2963 spin_unlock_bh(&session->lock);
2964
2965 debug_scsi("failing connection CID %d due to SCSI host reset "
2966 "[itt 0x%x age %d]", conn->id, ctask->itt,
2967 session->age);
2968 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2969
2970 return SUCCESS;
2971 }
2972
2973 static void
2974 iscsi_tmabort_timedout(unsigned long data)
2975 {
2976 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
2977 struct iscsi_conn *conn = ctask->conn;
2978 struct iscsi_session *session = conn->session;
2979
2980 spin_lock(&session->lock);
2981 if (conn->tmabort_state == TMABORT_INITIAL) {
2982 __kfifo_put(session->mgmtpool.queue,
2983 (void*)&ctask->mtask, sizeof(void*));
2984 conn->tmabort_state = TMABORT_TIMEDOUT;
2985 debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
2986 (long)ctask->sc, ctask->itt);
2987 /* unblock eh_abort() */
2988 wake_up(&conn->ehwait);
2989 }
2990 spin_unlock(&session->lock);
2991 }
2992
2993 static int
2994 iscsi_eh_abort(struct scsi_cmnd *sc)
2995 {
2996 int rc;
2997 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2998 struct iscsi_conn *conn = ctask->conn;
2999 struct iscsi_session *session = conn->session;
3000
3001 conn->eh_abort_cnt++;
3002 debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3003
3004 /*
3005 * two cases for ERL=0 here:
3006 *
3007 * 1) connection-level failure;
3008 * 2) recovery due protocol error;
3009 */
3010 down(&conn->xmitsema);
3011 spin_lock_bh(&session->lock);
3012 if (session->state != ISCSI_STATE_LOGGED_IN) {
3013 if (session->state == ISCSI_STATE_TERMINATE) {
3014 spin_unlock_bh(&session->lock);
3015 up(&conn->xmitsema);
3016 goto failed;
3017 }
3018 spin_unlock_bh(&session->lock);
3019 } else {
3020 struct iscsi_tm *hdr = &conn->tmhdr;
3021
3022 /*
3023 * Still LOGGED_IN...
3024 */
3025
3026 if (!ctask->sc || sc->SCp.phase != session->age) {
3027 /*
3028 * 1) ctask completed before time out. But session
3029 * is still ok => Happy Retry.
3030 * 2) session was re-open during time out of ctask.
3031 */
3032 spin_unlock_bh(&session->lock);
3033 up(&conn->xmitsema);
3034 goto success;
3035 }
3036 conn->tmabort_state = TMABORT_INITIAL;
3037 spin_unlock_bh(&session->lock);
3038
3039 /*
3040 * ctask timed out but session is OK
3041 * ERL=0 requires task mgmt abort to be issued on each
3042 * failed command. requests must be serialized.
3043 */
3044 memset(hdr, 0, sizeof(struct iscsi_tm));
3045 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
3046 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
3047 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3048 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
3049 hdr->rtt = ctask->hdr.itt;
3050 hdr->refcmdsn = ctask->hdr.cmdsn;
3051
3052 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
3053 NULL, 0);
3054 if (rc) {
3055 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3056 debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
3057 } else {
3058 struct iscsi_r2t_info *r2t;
3059
3060 /*
3061 * TMF abort vs. TMF response race logic
3062 */
3063 spin_lock_bh(&session->lock);
3064 ctask->mtask = (struct iscsi_mgmt_task *)
3065 session->mgmt_cmds[(hdr->itt & ITT_MASK) -
3066 ISCSI_MGMT_ITT_OFFSET];
3067 /*
3068 * have to flush r2tqueue to avoid r2t leaks
3069 */
3070 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
3071 sizeof(void*))) {
3072 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
3073 sizeof(void*));
3074 }
3075 if (conn->tmabort_state == TMABORT_INITIAL) {
3076 conn->tmfcmd_pdus_cnt++;
3077 conn->tmabort_timer.expires = 3*HZ + jiffies;
3078 conn->tmabort_timer.function =
3079 iscsi_tmabort_timedout;
3080 conn->tmabort_timer.data = (unsigned long)ctask;
3081 add_timer(&conn->tmabort_timer);
3082 debug_scsi("abort sent [itt 0x%x]", ctask->itt);
3083 } else {
3084 if (!ctask->sc ||
3085 conn->tmabort_state == TMABORT_SUCCESS) {
3086 conn->tmabort_state = TMABORT_INITIAL;
3087 spin_unlock_bh(&session->lock);
3088 up(&conn->xmitsema);
3089 goto success;
3090 }
3091 conn->tmabort_state = TMABORT_INITIAL;
3092 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3093 }
3094 spin_unlock_bh(&session->lock);
3095 }
3096 }
3097 up(&conn->xmitsema);
3098
3099
3100 /*
3101 * block eh thread until:
3102 *
3103 * 1) abort response;
3104 * 2) abort timeout;
3105 * 3) session re-opened;
3106 * 4) session terminated;
3107 */
3108 for (;;) {
3109 int p_state = session->state;
3110
3111 rc = wait_event_interruptible(conn->ehwait,
3112 (p_state == ISCSI_STATE_LOGGED_IN ?
3113 (session->state == ISCSI_STATE_TERMINATE ||
3114 conn->tmabort_state != TMABORT_INITIAL) :
3115 (session->state == ISCSI_STATE_TERMINATE ||
3116 session->state == ISCSI_STATE_LOGGED_IN)));
3117 if (rc) {
3118 /* shutdown.. */
3119 session->state = ISCSI_STATE_TERMINATE;
3120 goto failed;
3121 }
3122
3123 if (signal_pending(current))
3124 flush_signals(current);
3125
3126 if (session->state == ISCSI_STATE_TERMINATE)
3127 goto failed;
3128
3129 spin_lock_bh(&session->lock);
3130 if (sc->SCp.phase == session->age &&
3131 (conn->tmabort_state == TMABORT_TIMEDOUT ||
3132 conn->tmabort_state == TMABORT_FAILED)) {
3133 conn->tmabort_state = TMABORT_INITIAL;
3134 if (!ctask->sc) {
3135 /*
3136 * ctask completed before tmf abort response or
3137 * time out.
3138 * But session is still ok => Happy Retry.
3139 */
3140 spin_unlock_bh(&session->lock);
3141 break;
3142 }
3143 spin_unlock_bh(&session->lock);
3144 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3145 continue;
3146 }
3147 spin_unlock_bh(&session->lock);
3148 break;
3149 }
3150
3151 success:
3152 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3153 rc = SUCCESS;
3154 goto exit;
3155
3156 failed:
3157 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3158 rc = FAILED;
3159
3160 exit:
3161 del_timer_sync(&conn->tmabort_timer);
3162
3163 down(&conn->xmitsema);
3164 if (conn->sock) {
3165 struct sock *sk = conn->sock->sk;
3166
3167 write_lock_bh(&sk->sk_callback_lock);
3168 iscsi_ctask_cleanup(conn, ctask);
3169 write_unlock_bh(&sk->sk_callback_lock);
3170 }
3171 up(&conn->xmitsema);
3172 return rc;
3173 }
3174
3175 static int
3176 iscsi_r2tpool_alloc(struct iscsi_session *session)
3177 {
3178 int i;
3179 int cmd_i;
3180
3181 /*
3182 * initialize per-task: R2T pool and xmit queue
3183 */
3184 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3185 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3186
3187 /*
3188 * pre-allocated x4 as much r2ts to handle race when
3189 * target acks DataOut faster than we data_xmit() queues
3190 * could replenish r2tqueue.
3191 */
3192
3193 /* R2T pool */
3194 if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
3195 (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
3196 goto r2t_alloc_fail;
3197 }
3198
3199 /* R2T xmit queue */
3200 ctask->r2tqueue = kfifo_alloc(
3201 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
3202 if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
3203 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3204 goto r2t_alloc_fail;
3205 }
3206
3207 /*
3208 * number of
3209 * Data-Out PDU's within R2T-sequence can be quite big;
3210 * using mempool
3211 */
3212 ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
3213 mempool_alloc_slab, mempool_free_slab, taskcache);
3214 if (ctask->datapool == NULL) {
3215 kfifo_free(ctask->r2tqueue);
3216 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3217 goto r2t_alloc_fail;
3218 }
3219 INIT_LIST_HEAD(&ctask->dataqueue);
3220 }
3221
3222 return 0;
3223
3224 r2t_alloc_fail:
3225 for (i = 0; i < cmd_i; i++) {
3226 mempool_destroy(session->cmds[i]->datapool);
3227 kfifo_free(session->cmds[i]->r2tqueue);
3228 iscsi_pool_free(&session->cmds[i]->r2tpool,
3229 (void**)session->cmds[i]->r2ts);
3230 }
3231 return -ENOMEM;
3232 }
3233
3234 static void
3235 iscsi_r2tpool_free(struct iscsi_session *session)
3236 {
3237 int i;
3238
3239 for (i = 0; i < session->cmds_max; i++) {
3240 mempool_destroy(session->cmds[i]->datapool);
3241 kfifo_free(session->cmds[i]->r2tqueue);
3242 iscsi_pool_free(&session->cmds[i]->r2tpool,
3243 (void**)session->cmds[i]->r2ts);
3244 }
3245 }
3246
3247 static struct scsi_host_template iscsi_sht = {
3248 .name = "iSCSI Initiator over TCP/IP, v."
3249 ISCSI_VERSION_STR,
3250 .queuecommand = iscsi_queuecommand,
3251 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
3252 .sg_tablesize = ISCSI_SG_TABLESIZE,
3253 .cmd_per_lun = ISCSI_CMD_PER_LUN,
3254 .eh_abort_handler = iscsi_eh_abort,
3255 .eh_host_reset_handler = iscsi_eh_host_reset,
3256 .use_clustering = DISABLE_CLUSTERING,
3257 .proc_name = "iscsi_tcp",
3258 .this_id = -1,
3259 };
3260
3261 static iscsi_sessionh_t
3262 iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
3263 {
3264 int cmd_i;
3265 struct iscsi_session *session;
3266
3267 session = iscsi_hostdata(host->hostdata);
3268 memset(session, 0, sizeof(struct iscsi_session));
3269
3270 session->host = host;
3271 session->id = host->host_no;
3272 session->state = ISCSI_STATE_LOGGED_IN;
3273 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
3274 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
3275 session->cmdsn = initial_cmdsn;
3276 session->exp_cmdsn = initial_cmdsn + 1;
3277 session->max_cmdsn = initial_cmdsn + 1;
3278 session->max_r2t = 1;
3279
3280 /* initialize SCSI PDU commands pool */
3281 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
3282 (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
3283 goto cmdpool_alloc_fail;
3284
3285 /* pre-format cmds pool with ITT */
3286 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
3287 session->cmds[cmd_i]->itt = cmd_i;
3288
3289 spin_lock_init(&session->lock);
3290 INIT_LIST_HEAD(&session->connections);
3291
3292 /* initialize immediate command pool */
3293 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
3294 (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
3295 goto mgmtpool_alloc_fail;
3296
3297
3298 /* pre-format immediate cmds pool with ITT */
3299 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
3300 session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
3301 session->mgmt_cmds[cmd_i]->data = kmalloc(
3302 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
3303 if (!session->mgmt_cmds[cmd_i]->data) {
3304 int j;
3305
3306 for (j = 0; j < cmd_i; j++)
3307 kfree(session->mgmt_cmds[j]->data);
3308 goto immdata_alloc_fail;
3309 }
3310 }
3311
3312 if (iscsi_r2tpool_alloc(session))
3313 goto r2tpool_alloc_fail;
3314
3315 return iscsi_handle(session);
3316
3317 r2tpool_alloc_fail:
3318 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3319 kfree(session->mgmt_cmds[cmd_i]->data);
3320 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3321 immdata_alloc_fail:
3322 mgmtpool_alloc_fail:
3323 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3324 cmdpool_alloc_fail:
3325 return iscsi_handle(NULL);
3326 }
3327
3328 static void
3329 iscsi_session_destroy(iscsi_sessionh_t sessionh)
3330 {
3331 int cmd_i;
3332 struct iscsi_data_task *dtask, *n;
3333 struct iscsi_session *session = iscsi_ptr(sessionh);
3334
3335 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3336 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3337 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
3338 list_del(&dtask->item);
3339 mempool_free(dtask, ctask->datapool);
3340 }
3341 }
3342
3343 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3344 kfree(session->mgmt_cmds[cmd_i]->data);
3345
3346 iscsi_r2tpool_free(session);
3347 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3348 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3349 }
3350
3351 static int
3352 iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
3353 uint32_t value)
3354 {
3355 struct iscsi_conn *conn = iscsi_ptr(connh);
3356 struct iscsi_session *session = conn->session;
3357
3358 spin_lock_bh(&session->lock);
3359 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
3360 conn->stop_stage != STOP_CONN_RECOVER) {
3361 printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
3362 param);
3363 spin_unlock_bh(&session->lock);
3364 return 0;
3365 }
3366 spin_unlock_bh(&session->lock);
3367
3368 switch(param) {
3369 case ISCSI_PARAM_MAX_RECV_DLENGTH: {
3370 char *saveptr = conn->data;
3371 gfp_t flags = GFP_KERNEL;
3372
3373 if (conn->data_size >= value) {
3374 conn->max_recv_dlength = value;
3375 break;
3376 }
3377
3378 spin_lock_bh(&session->lock);
3379 if (conn->stop_stage == STOP_CONN_RECOVER)
3380 flags = GFP_ATOMIC;
3381 spin_unlock_bh(&session->lock);
3382
3383 if (value <= PAGE_SIZE)
3384 conn->data = kmalloc(value, flags);
3385 else
3386 conn->data = (void*)__get_free_pages(flags,
3387 get_order(value));
3388 if (conn->data == NULL) {
3389 conn->data = saveptr;
3390 return -ENOMEM;
3391 }
3392 if (conn->data_size <= PAGE_SIZE)
3393 kfree(saveptr);
3394 else
3395 free_pages((unsigned long)saveptr,
3396 get_order(conn->data_size));
3397 conn->max_recv_dlength = value;
3398 conn->data_size = value;
3399 }
3400 break;
3401 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3402 conn->max_xmit_dlength = value;
3403 break;
3404 case ISCSI_PARAM_HDRDGST_EN:
3405 conn->hdrdgst_en = value;
3406 conn->hdr_size = sizeof(struct iscsi_hdr);
3407 if (conn->hdrdgst_en) {
3408 conn->hdr_size += sizeof(__u32);
3409 if (!conn->tx_tfm)
3410 conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
3411 if (!conn->tx_tfm)
3412 return -ENOMEM;
3413 if (!conn->rx_tfm)
3414 conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
3415 if (!conn->rx_tfm) {
3416 crypto_free_tfm(conn->tx_tfm);
3417 return -ENOMEM;
3418 }
3419 } else {
3420 if (conn->tx_tfm)
3421 crypto_free_tfm(conn->tx_tfm);
3422 if (conn->rx_tfm)
3423 crypto_free_tfm(conn->rx_tfm);
3424 }
3425 break;
3426 case ISCSI_PARAM_DATADGST_EN:
3427 conn->datadgst_en = value;
3428 if (conn->datadgst_en) {
3429 if (!conn->data_tx_tfm)
3430 conn->data_tx_tfm =
3431 crypto_alloc_tfm("crc32c", 0);
3432 if (!conn->data_tx_tfm)
3433 return -ENOMEM;
3434 if (!conn->data_rx_tfm)
3435 conn->data_rx_tfm =
3436 crypto_alloc_tfm("crc32c", 0);
3437 if (!conn->data_rx_tfm) {
3438 crypto_free_tfm(conn->data_tx_tfm);
3439 return -ENOMEM;
3440 }
3441 } else {
3442 if (conn->data_tx_tfm)
3443 crypto_free_tfm(conn->data_tx_tfm);
3444 if (conn->data_rx_tfm)
3445 crypto_free_tfm(conn->data_rx_tfm);
3446 }
3447 break;
3448 case ISCSI_PARAM_INITIAL_R2T_EN:
3449 session->initial_r2t_en = value;
3450 break;
3451 case ISCSI_PARAM_MAX_R2T:
3452 if (session->max_r2t == roundup_pow_of_two(value))
3453 break;
3454 iscsi_r2tpool_free(session);
3455 session->max_r2t = value;
3456 if (session->max_r2t & (session->max_r2t - 1))
3457 session->max_r2t = roundup_pow_of_two(session->max_r2t);
3458 if (iscsi_r2tpool_alloc(session))
3459 return -ENOMEM;
3460 break;
3461 case ISCSI_PARAM_IMM_DATA_EN:
3462 session->imm_data_en = value;
3463 break;
3464 case ISCSI_PARAM_FIRST_BURST:
3465 session->first_burst = value;
3466 break;
3467 case ISCSI_PARAM_MAX_BURST:
3468 session->max_burst = value;
3469 break;
3470 case ISCSI_PARAM_PDU_INORDER_EN:
3471 session->pdu_inorder_en = value;
3472 break;
3473 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3474 session->dataseq_inorder_en = value;
3475 break;
3476 case ISCSI_PARAM_ERL:
3477 session->erl = value;
3478 break;
3479 case ISCSI_PARAM_IFMARKER_EN:
3480 BUG_ON(value);
3481 session->ifmarker_en = value;
3482 break;
3483 case ISCSI_PARAM_OFMARKER_EN:
3484 BUG_ON(value);
3485 session->ofmarker_en = value;
3486 break;
3487 default:
3488 break;
3489 }
3490
3491 return 0;
3492 }
3493
3494 static int
3495 iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
3496 uint32_t *value)
3497 {
3498 struct iscsi_conn *conn = iscsi_ptr(connh);
3499 struct iscsi_session *session = conn->session;
3500
3501 switch(param) {
3502 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3503 *value = conn->max_recv_dlength;
3504 break;
3505 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3506 *value = conn->max_xmit_dlength;
3507 break;
3508 case ISCSI_PARAM_HDRDGST_EN:
3509 *value = conn->hdrdgst_en;
3510 break;
3511 case ISCSI_PARAM_DATADGST_EN:
3512 *value = conn->datadgst_en;
3513 break;
3514 case ISCSI_PARAM_INITIAL_R2T_EN:
3515 *value = session->initial_r2t_en;
3516 break;
3517 case ISCSI_PARAM_MAX_R2T:
3518 *value = session->max_r2t;
3519 break;
3520 case ISCSI_PARAM_IMM_DATA_EN:
3521 *value = session->imm_data_en;
3522 break;
3523 case ISCSI_PARAM_FIRST_BURST:
3524 *value = session->first_burst;
3525 break;
3526 case ISCSI_PARAM_MAX_BURST:
3527 *value = session->max_burst;
3528 break;
3529 case ISCSI_PARAM_PDU_INORDER_EN:
3530 *value = session->pdu_inorder_en;
3531 break;
3532 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3533 *value = session->dataseq_inorder_en;
3534 break;
3535 case ISCSI_PARAM_ERL:
3536 *value = session->erl;
3537 break;
3538 case ISCSI_PARAM_IFMARKER_EN:
3539 *value = session->ifmarker_en;
3540 break;
3541 case ISCSI_PARAM_OFMARKER_EN:
3542 *value = session->ofmarker_en;
3543 break;
3544 default:
3545 return ISCSI_ERR_PARAM_NOT_FOUND;
3546 }
3547
3548 return 0;
3549 }
3550
3551 static void
3552 iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
3553 {
3554 struct iscsi_conn *conn = iscsi_ptr(connh);
3555
3556 stats->txdata_octets = conn->txdata_octets;
3557 stats->rxdata_octets = conn->rxdata_octets;
3558 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
3559 stats->dataout_pdus = conn->dataout_pdus_cnt;
3560 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
3561 stats->datain_pdus = conn->datain_pdus_cnt;
3562 stats->r2t_pdus = conn->r2t_pdus_cnt;
3563 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
3564 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
3565 stats->custom_length = 3;
3566 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
3567 stats->custom[0].value = conn->sendpage_failures_cnt;
3568 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
3569 stats->custom[1].value = conn->discontiguous_hdr_cnt;
3570 strcpy(stats->custom[2].desc, "eh_abort_cnt");
3571 stats->custom[2].value = conn->eh_abort_cnt;
3572 }
3573
3574 static int
3575 iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
3576 uint32_t data_size)
3577 {
3578 struct iscsi_conn *conn = iscsi_ptr(connh);
3579 int rc;
3580
3581 down(&conn->xmitsema);
3582 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
3583 up(&conn->xmitsema);
3584
3585 return rc;
3586 }
3587
3588 static struct iscsi_transport iscsi_tcp_transport = {
3589 .owner = THIS_MODULE,
3590 .name = "tcp",
3591 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
3592 | CAP_DATADGST,
3593 .host_template = &iscsi_sht,
3594 .hostdata_size = sizeof(struct iscsi_session),
3595 .max_conn = 1,
3596 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
3597 .create_session = iscsi_session_create,
3598 .destroy_session = iscsi_session_destroy,
3599 .create_conn = iscsi_conn_create,
3600 .bind_conn = iscsi_conn_bind,
3601 .destroy_conn = iscsi_conn_destroy,
3602 .set_param = iscsi_conn_set_param,
3603 .get_param = iscsi_conn_get_param,
3604 .start_conn = iscsi_conn_start,
3605 .stop_conn = iscsi_conn_stop,
3606 .send_pdu = iscsi_conn_send_pdu,
3607 .get_stats = iscsi_conn_get_stats,
3608 };
3609
3610 static int __init
3611 iscsi_tcp_init(void)
3612 {
3613 int error;
3614
3615 if (iscsi_max_lun < 1) {
3616 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
3617 return -EINVAL;
3618 }
3619 iscsi_tcp_transport.max_lun = iscsi_max_lun;
3620
3621 taskcache = kmem_cache_create("iscsi_taskcache",
3622 sizeof(struct iscsi_data_task), 0,
3623 SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
3624 if (!taskcache)
3625 return -ENOMEM;
3626
3627 error = iscsi_register_transport(&iscsi_tcp_transport);
3628 if (error)
3629 kmem_cache_destroy(taskcache);
3630
3631 return error;
3632 }
3633
3634 static void __exit
3635 iscsi_tcp_exit(void)
3636 {
3637 iscsi_unregister_transport(&iscsi_tcp_transport);
3638 kmem_cache_destroy(taskcache);
3639 }
3640
3641 module_init(iscsi_tcp_init);
3642 module_exit(iscsi_tcp_exit);
Linux kernel - Deliverables
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