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[SCSI] iscsi: handle nonlinear skbs
[usb.git] / drivers / scsi / iscsi_tcp.c
blobbb0a5039d3345552ded4890637fd7f84d8fe41ba
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
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*sizeof(__u16));
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 case ISCSI_OP_NOOP_IN:
676 case ISCSI_OP_TEXT_RSP:
677 case ISCSI_OP_LOGOUT_RSP:
678 case ISCSI_OP_ASYNC_EVENT:
679 case ISCSI_OP_REJECT:
680 rc = iscsi_check_assign_cmdsn(session,
681 (struct iscsi_nopin*)hdr);
682 if (rc)
683 break;
684
685 /* update ExpStatSN */
686 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
687 if (!conn->in.datalen) {
688 struct iscsi_mgmt_task *mtask;
689
690 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
691 NULL, 0);
692 mtask = (struct iscsi_mgmt_task *)
693 session->mgmt_cmds[conn->in.itt -
694 ISCSI_MGMT_ITT_OFFSET];
695 if (conn->login_mtask != mtask) {
696 spin_lock(&session->lock);
697 __kfifo_put(session->mgmtpool.queue,
698 (void*)&mtask, sizeof(void*));
699 spin_unlock(&session->lock);
700 }
701 }
702 break;
703 default:
704 rc = ISCSI_ERR_BAD_OPCODE;
705 break;
706 }
707 } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
708 conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
709 session->mgmtpool_max) {
710 struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
711 session->mgmt_cmds[conn->in.itt -
712 ISCSI_MGMT_ITT_OFFSET];
713
714 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
715 conn->in.opcode, conn->id, mtask->itt,
716 conn->in.datalen);
717
718 switch(conn->in.opcode) {
719 case ISCSI_OP_LOGIN_RSP:
720 case ISCSI_OP_TEXT_RSP:
721 rc = iscsi_check_assign_cmdsn(session,
722 (struct iscsi_nopin*)hdr);
723 if (rc)
724 break;
725
726 if (!conn->in.datalen) {
727 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
728 NULL, 0);
729 if (conn->login_mtask != mtask) {
730 spin_lock(&session->lock);
731 __kfifo_put(session->mgmtpool.queue,
732 (void*)&mtask, sizeof(void*));
733 spin_unlock(&session->lock);
734 }
735 }
736 break;
737 case ISCSI_OP_SCSI_TMFUNC_RSP:
738 rc = iscsi_check_assign_cmdsn(session,
739 (struct iscsi_nopin*)hdr);
740 if (rc)
741 break;
742
743 if (conn->in.datalen || conn->in.ahslen) {
744 rc = ISCSI_ERR_PROTO;
745 break;
746 }
747 conn->tmfrsp_pdus_cnt++;
748 spin_lock(&session->lock);
749 if (conn->tmabort_state == TMABORT_INITIAL) {
750 __kfifo_put(session->mgmtpool.queue,
751 (void*)&mtask, sizeof(void*));
752 conn->tmabort_state =
753 ((struct iscsi_tm_rsp *)hdr)->
754 response == SCSI_TCP_TM_RESP_COMPLETE ?
755 TMABORT_SUCCESS:TMABORT_FAILED;
756 /* unblock eh_abort() */
757 wake_up(&conn->ehwait);
758 }
759 spin_unlock(&session->lock);
760 break;
761 default:
762 rc = ISCSI_ERR_BAD_OPCODE;
763 break;
764 }
765 } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
766 if (conn->in.opcode == ISCSI_OP_NOOP_IN && !conn->in.datalen) {
767 rc = iscsi_check_assign_cmdsn(session,
768 (struct iscsi_nopin*)hdr);
769 if (!rc)
770 rc = iscsi_recv_pdu(iscsi_handle(conn),
771 hdr, NULL, 0);
772 }
773 else
774 rc = ISCSI_ERR_BAD_OPCODE;
775 } else
776 rc = ISCSI_ERR_BAD_ITT;
777
778 return rc;
779 }
780
781 /**
782 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
783 * @conn: iscsi connection
784 * @ctask: scsi command task
785 * @buf: buffer to copy to
786 * @buf_size: size of buffer
787 * @offset: offset within the buffer
788 *
789 * Notes:
790 * The function calls skb_copy_bits() and updates per-connection and
791 * per-cmd byte counters.
792 *
793 * Read counters (in bytes):
794 *
795 * conn->in.offset offset within in progress SKB
796 * conn->in.copy left to copy from in progress SKB
797 * including padding
798 * conn->in.copied copied already from in progress SKB
799 * conn->data_copied copied already from in progress buffer
800 * ctask->sent total bytes sent up to the MidLayer
801 * ctask->data_count left to copy from in progress Data-In
802 * buf_left left to copy from in progress buffer
803 **/
804 static inline int
805 iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
806 void *buf, int buf_size, int offset)
807 {
808 int buf_left = buf_size - (conn->data_copied + offset);
809 int size = min(conn->in.copy, buf_left);
810 int rc;
811
812 size = min(size, ctask->data_count);
813
814 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
815 size, conn->in.offset, conn->in.copied);
816
817 BUG_ON(size <= 0);
818 BUG_ON(ctask->sent + size > ctask->total_length);
819
820 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
821 (char*)buf + (offset + conn->data_copied), size);
822 /* must fit into skb->len */
823 BUG_ON(rc);
824
825 conn->in.offset += size;
826 conn->in.copy -= size;
827 conn->in.copied += size;
828 conn->data_copied += size;
829 ctask->sent += size;
830 ctask->data_count -= size;
831
832 BUG_ON(conn->in.copy < 0);
833 BUG_ON(ctask->data_count < 0);
834
835 if (buf_size != (conn->data_copied + offset)) {
836 if (!ctask->data_count) {
837 BUG_ON(buf_size - conn->data_copied < 0);
838 /* done with this PDU */
839 return buf_size - conn->data_copied;
840 }
841 return -EAGAIN;
842 }
843
844 /* done with this buffer or with both - PDU and buffer */
845 conn->data_copied = 0;
846 return 0;
847 }
848
849 /**
850 * iscsi_tcp_copy - copy skb bits to the destanation buffer
851 * @conn: iscsi connection
852 * @buf: buffer to copy to
853 * @buf_size: number of bytes to copy
854 *
855 * Notes:
856 * The function calls skb_copy_bits() and updates per-connection
857 * byte counters.
858 **/
859 static inline int
860 iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
861 {
862 int buf_left = buf_size - conn->data_copied;
863 int size = min(conn->in.copy, buf_left);
864 int rc;
865
866 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
867 size, conn->in.offset, conn->data_copied);
868 BUG_ON(size <= 0);
869
870 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
871 (char*)buf + conn->data_copied, size);
872 BUG_ON(rc);
873
874 conn->in.offset += size;
875 conn->in.copy -= size;
876 conn->in.copied += size;
877 conn->data_copied += size;
878
879 if (buf_size != conn->data_copied)
880 return -EAGAIN;
881
882 return 0;
883 }
884
885 static inline void
886 partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
887 int offset, int length)
888 {
889 struct scatterlist temp;
890
891 memcpy(&temp, sg, sizeof(struct scatterlist));
892 temp.offset = offset;
893 temp.length = length;
894 crypto_digest_update(conn->data_rx_tfm, &temp, 1);
895 }
896
897 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
898 {
899 struct iscsi_cmd_task *ctask = conn->in.ctask;
900 struct scsi_cmnd *sc = ctask->sc;
901 struct scatterlist tmp, *sg;
902 int i, offset, rc = 0;
903
904 BUG_ON((void*)ctask != sc->SCp.ptr);
905
906 /*
907 * copying Data-In into the Scsi_Cmnd
908 */
909 if (!sc->use_sg) {
910 i = ctask->data_count;
911 rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
912 sc->request_bufflen, ctask->data_offset);
913 if (rc == -EAGAIN)
914 return rc;
915 if (conn->datadgst_en) {
916 sg_init_one(&tmp, sc->request_buffer, i);
917 crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
918 }
919 rc = 0;
920 goto done;
921 }
922
923 offset = ctask->data_offset;
924 sg = sc->request_buffer;
925
926 if (ctask->data_offset)
927 for (i = 0; i < ctask->sg_count; i++)
928 offset -= sg[i].length;
929 /* we've passed through partial sg*/
930 if (offset < 0)
931 offset = 0;
932
933 for (i = ctask->sg_count; i < sc->use_sg; i++) {
934 char *dest;
935
936 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
937 rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
938 sg[i].length, offset);
939 kunmap_atomic(dest, KM_SOFTIRQ0);
940 if (rc == -EAGAIN)
941 /* continue with the next SKB/PDU */
942 return rc;
943 if (!rc) {
944 if (conn->datadgst_en) {
945 if (!offset)
946 crypto_digest_update(conn->data_rx_tfm,
947 &sg[i], 1);
948 else
949 partial_sg_digest_update(conn, &sg[i],
950 sg[i].offset + offset,
951 sg[i].length - offset);
952 }
953 offset = 0;
954 ctask->sg_count++;
955 }
956
957 if (!ctask->data_count) {
958 if (rc && conn->datadgst_en)
959 /*
960 * data-in is complete, but buffer not...
961 */
962 partial_sg_digest_update(conn, &sg[i],
963 sg[i].offset, sg[i].length-rc);
964 rc = 0;
965 break;
966 }
967
968 if (!conn->in.copy)
969 return -EAGAIN;
970 }
971 BUG_ON(ctask->data_count);
972
973 done:
974 /* check for non-exceptional status */
975 if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
976 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
977 (long)sc, sc->result, ctask->itt);
978 conn->scsirsp_pdus_cnt++;
979 iscsi_ctask_cleanup(conn, ctask);
980 sc->scsi_done(sc);
981 }
982
983 return rc;
984 }
985
986 static int
987 iscsi_data_recv(struct iscsi_conn *conn)
988 {
989 struct iscsi_session *session = conn->session;
990 int rc = 0;
991
992 switch(conn->in.opcode) {
993 case ISCSI_OP_SCSI_DATA_IN:
994 rc = iscsi_scsi_data_in(conn);
995 break;
996 case ISCSI_OP_SCSI_CMD_RSP: {
997 /*
998 * SCSI Sense Data:
999 * copying the entire Data Segment.
1000 */
1001 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1002 rc = -EAGAIN;
1003 goto exit;
1004 }
1005
1006 /*
1007 * check for sense
1008 */
1009 conn->in.hdr = &conn->hdr;
1010 conn->senselen = (conn->data[0] << 8) | conn->data[1];
1011 rc = iscsi_cmd_rsp(conn, conn->in.ctask);
1012 }
1013 break;
1014 case ISCSI_OP_TEXT_RSP:
1015 case ISCSI_OP_LOGIN_RSP:
1016 case ISCSI_OP_NOOP_IN: {
1017 struct iscsi_mgmt_task *mtask = NULL;
1018
1019 if (conn->in.itt != ISCSI_RESERVED_TAG)
1020 mtask = (struct iscsi_mgmt_task *)
1021 session->mgmt_cmds[conn->in.itt -
1022 ISCSI_MGMT_ITT_OFFSET];
1023
1024 /*
1025 * Collect data segment to the connection's data
1026 * placeholder
1027 */
1028 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1029 rc = -EAGAIN;
1030 goto exit;
1031 }
1032
1033 rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
1034 conn->data, conn->in.datalen);
1035
1036 if (mtask && conn->login_mtask != mtask) {
1037 spin_lock(&session->lock);
1038 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1039 sizeof(void*));
1040 spin_unlock(&session->lock);
1041 }
1042 }
1043 break;
1044 default:
1045 BUG_ON(1);
1046 }
1047 exit:
1048 return rc;
1049 }
1050
1051 /**
1052 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
1053 * @rd_desc: read descriptor
1054 * @skb: socket buffer
1055 * @offset: offset in skb
1056 * @len: skb->len - offset
1057 **/
1058 static int
1059 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
1060 unsigned int offset, size_t len)
1061 {
1062 int rc;
1063 struct iscsi_conn *conn = rd_desc->arg.data;
1064 int processed;
1065 char pad[ISCSI_PAD_LEN];
1066 struct scatterlist sg;
1067
1068 /*
1069 * Save current SKB and its offset in the corresponding
1070 * connection context.
1071 */
1072 conn->in.copy = skb->len - offset;
1073 conn->in.offset = offset;
1074 conn->in.skb = skb;
1075 conn->in.len = conn->in.copy;
1076 BUG_ON(conn->in.copy <= 0);
1077 debug_tcp("in %d bytes\n", conn->in.copy);
1078
1079 more:
1080 conn->in.copied = 0;
1081 rc = 0;
1082
1083 if (unlikely(conn->suspend_rx)) {
1084 debug_tcp("conn %d Rx suspended!\n", conn->id);
1085 return 0;
1086 }
1087
1088 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
1089 conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
1090 rc = iscsi_hdr_extract(conn);
1091 if (rc) {
1092 if (rc == -EAGAIN)
1093 goto nomore;
1094 else {
1095 iscsi_conn_failure(conn, rc);
1096 return 0;
1097 }
1098 }
1099
1100 /*
1101 * Verify and process incoming PDU header.
1102 */
1103 rc = iscsi_hdr_recv(conn);
1104 if (!rc && conn->in.datalen) {
1105 if (conn->datadgst_en &&
1106 conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1107 BUG_ON(!conn->data_rx_tfm);
1108 crypto_digest_init(conn->data_rx_tfm);
1109 }
1110 conn->in_progress = IN_PROGRESS_DATA_RECV;
1111 } else if (rc) {
1112 iscsi_conn_failure(conn, rc);
1113 return 0;
1114 }
1115 }
1116
1117 if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
1118 debug_tcp("extra data_recv offset %d copy %d\n",
1119 conn->in.offset, conn->in.copy);
1120 if (conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1121 uint32_t recv_digest;
1122 skb_copy_bits(conn->in.skb, conn->in.offset,
1123 &recv_digest, 4);
1124 conn->in.offset += 4;
1125 conn->in.copy -= 4;
1126 if (recv_digest != conn->in.datadgst) {
1127 debug_tcp("iscsi_tcp: data digest error!"
1128 "0x%x != 0x%x\n", recv_digest,
1129 conn->in.datadgst);
1130 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1131 return 0;
1132 } else {
1133 debug_tcp("iscsi_tcp: data digest match!"
1134 "0x%x == 0x%x\n", recv_digest,
1135 conn->in.datadgst);
1136 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1137 }
1138 }
1139 }
1140
1141 if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
1142
1143 debug_tcp("data_recv offset %d copy %d\n",
1144 conn->in.offset, conn->in.copy);
1145
1146 rc = iscsi_data_recv(conn);
1147 if (rc) {
1148 if (rc == -EAGAIN) {
1149 rd_desc->count = conn->in.datalen -
1150 conn->in.ctask->data_count;
1151 goto again;
1152 }
1153 iscsi_conn_failure(conn, rc);
1154 return 0;
1155 }
1156 conn->in.copy -= conn->in.padding;
1157 conn->in.offset += conn->in.padding;
1158 if (conn->datadgst_en &&
1159 conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) {
1160 if (conn->in.padding) {
1161 debug_tcp("padding -> %d\n", conn->in.padding);
1162 memset(pad, 0, conn->in.padding);
1163 sg_init_one(&sg, pad, conn->in.padding);
1164 crypto_digest_update(conn->data_rx_tfm, &sg, 1);
1165 }
1166 crypto_digest_final(conn->data_rx_tfm,
1167 (u8 *) & conn->in.datadgst);
1168 debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
1169 conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
1170 } else
1171 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1172 }
1173
1174 debug_tcp("f, processed %d from out of %d padding %d\n",
1175 conn->in.offset - offset, (int)len, conn->in.padding);
1176 BUG_ON(conn->in.offset - offset > len);
1177
1178 if (conn->in.offset - offset != len) {
1179 debug_tcp("continue to process %d bytes\n",
1180 (int)len - (conn->in.offset - offset));
1181 goto more;
1182 }
1183
1184 nomore:
1185 processed = conn->in.offset - offset;
1186 BUG_ON(processed == 0);
1187 return processed;
1188
1189 again:
1190 processed = conn->in.offset - offset;
1191 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1192 processed, (int)len, (int)rd_desc->count);
1193 BUG_ON(processed == 0);
1194 BUG_ON(processed > len);
1195
1196 conn->rxdata_octets += processed;
1197 return processed;
1198 }
1199
1200 static void
1201 iscsi_tcp_data_ready(struct sock *sk, int flag)
1202 {
1203 struct iscsi_conn *conn = sk->sk_user_data;
1204 read_descriptor_t rd_desc;
1205
1206 read_lock(&sk->sk_callback_lock);
1207
1208 /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
1209 rd_desc.arg.data = conn;
1210 rd_desc.count = 0;
1211 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1212
1213 read_unlock(&sk->sk_callback_lock);
1214 }
1215
1216 static void
1217 iscsi_tcp_state_change(struct sock *sk)
1218 {
1219 struct iscsi_conn *conn;
1220 struct iscsi_session *session;
1221 void (*old_state_change)(struct sock *);
1222
1223 read_lock(&sk->sk_callback_lock);
1224
1225 conn = (struct iscsi_conn*)sk->sk_user_data;
1226 session = conn->session;
1227
1228 if (sk->sk_state == TCP_CLOSE_WAIT ||
1229 sk->sk_state == TCP_CLOSE) {
1230 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1231 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1232 }
1233
1234 old_state_change = conn->old_state_change;
1235
1236 read_unlock(&sk->sk_callback_lock);
1237
1238 old_state_change(sk);
1239 }
1240
1241 /**
1242 * iscsi_write_space - Called when more output buffer space is available
1243 * @sk: socket space is available for
1244 **/
1245 static void
1246 iscsi_write_space(struct sock *sk)
1247 {
1248 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1249 conn->old_write_space(sk);
1250 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1251 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
1252 schedule_work(&conn->xmitwork);
1253 }
1254
1255 static void
1256 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1257 {
1258 struct sock *sk = conn->sock->sk;
1259
1260 /* assign new callbacks */
1261 write_lock_bh(&sk->sk_callback_lock);
1262 sk->sk_user_data = conn;
1263 conn->old_data_ready = sk->sk_data_ready;
1264 conn->old_state_change = sk->sk_state_change;
1265 conn->old_write_space = sk->sk_write_space;
1266 sk->sk_data_ready = iscsi_tcp_data_ready;
1267 sk->sk_state_change = iscsi_tcp_state_change;
1268 sk->sk_write_space = iscsi_write_space;
1269 write_unlock_bh(&sk->sk_callback_lock);
1270 }
1271
1272 static void
1273 iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
1274 {
1275 struct sock *sk = conn->sock->sk;
1276
1277 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1278 write_lock_bh(&sk->sk_callback_lock);
1279 sk->sk_user_data = NULL;
1280 sk->sk_data_ready = conn->old_data_ready;
1281 sk->sk_state_change = conn->old_state_change;
1282 sk->sk_write_space = conn->old_write_space;
1283 sk->sk_no_check = 0;
1284 write_unlock_bh(&sk->sk_callback_lock);
1285 }
1286
1287 /**
1288 * iscsi_send - generic send routine
1289 * @sk: kernel's socket
1290 * @buf: buffer to write from
1291 * @size: actual size to write
1292 * @flags: socket's flags
1293 *
1294 * Notes:
1295 * depending on buffer will use tcp_sendpage() or tcp_sendmsg().
1296 * buf->sg.offset == -1 tells us that buffer is non S/G and forces
1297 * to use tcp_sendmsg().
1298 */
1299 static inline int
1300 iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
1301 {
1302 int res;
1303
1304 if ((int)buf->sg.offset >= 0) {
1305 int offset = buf->sg.offset + buf->sent;
1306
1307 /* tcp_sendpage */
1308 res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
1309 } else {
1310 struct msghdr msg;
1311
1312 buf->iov.iov_base = iscsi_buf_iov_base(buf);
1313 buf->iov.iov_len = size;
1314
1315 memset(&msg, 0, sizeof(struct msghdr));
1316
1317 /* tcp_sendmsg */
1318 res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
1319 }
1320
1321 return res;
1322 }
1323
1324 /**
1325 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1326 * @conn: iscsi connection
1327 * @buf: buffer to write from
1328 * @datalen: lenght of data to be sent after the header
1329 *
1330 * Notes:
1331 * (Tx, Fast Path)
1332 **/
1333 static inline int
1334 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1335 {
1336 struct socket *sk = conn->sock;
1337 int flags = 0; /* MSG_DONTWAIT; */
1338 int res, size;
1339
1340 size = buf->sg.length - buf->sent;
1341 BUG_ON(buf->sent + size > buf->sg.length);
1342 if (buf->sent + size != buf->sg.length || datalen)
1343 flags |= MSG_MORE;
1344
1345 res = iscsi_send(sk, buf, size, flags);
1346 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1347 if (res >= 0) {
1348 conn->txdata_octets += res;
1349 buf->sent += res;
1350 if (size != res)
1351 return -EAGAIN;
1352 return 0;
1353 } else if (res == -EAGAIN) {
1354 conn->sendpage_failures_cnt++;
1355 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1356 } else if (res == -EPIPE)
1357 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1358
1359 return res;
1360 }
1361
1362 /**
1363 * iscsi_sendpage - send one page of iSCSI Data-Out.
1364 * @conn: iscsi connection
1365 * @buf: buffer to write from
1366 * @count: remaining data
1367 * @sent: number of bytes sent
1368 *
1369 * Notes:
1370 * (Tx, Fast Path)
1371 **/
1372 static inline int
1373 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1374 int *count, int *sent)
1375 {
1376 struct socket *sk = conn->sock;
1377 int flags = 0; /* MSG_DONTWAIT; */
1378 int res, size;
1379
1380 size = buf->sg.length - buf->sent;
1381 BUG_ON(buf->sent + size > buf->sg.length);
1382 if (size > *count)
1383 size = *count;
1384 if (buf->sent + size != buf->sg.length || *count != size)
1385 flags |= MSG_MORE;
1386
1387 res = iscsi_send(sk, buf, size, flags);
1388 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1389 size, buf->sent, *count, *sent, res);
1390 if (res >= 0) {
1391 conn->txdata_octets += res;
1392 buf->sent += res;
1393 *count -= res;
1394 *sent += res;
1395 if (size != res)
1396 return -EAGAIN;
1397 return 0;
1398 } else if (res == -EAGAIN) {
1399 conn->sendpage_failures_cnt++;
1400 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1401 } else if (res == -EPIPE)
1402 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1403
1404 return res;
1405 }
1406
1407 static inline void
1408 iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1409 {
1410 BUG_ON(!conn->data_tx_tfm);
1411 crypto_digest_init(conn->data_tx_tfm);
1412 ctask->digest_count = 4;
1413 }
1414
1415 static inline void
1416 iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
1417 {
1418 struct scatterlist sg;
1419
1420 if (buf->sg.offset != -1)
1421 crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
1422 else {
1423 sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
1424 crypto_digest_update(conn->data_tx_tfm, &sg, 1);
1425 }
1426 }
1427
1428 static inline int
1429 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1430 struct iscsi_buf *buf, uint32_t *digest, int final)
1431 {
1432 int rc = 0;
1433 int sent = 0;
1434
1435 if (final)
1436 crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
1437
1438 iscsi_buf_init_virt(buf, (char*)digest, 4);
1439 rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
1440 if (rc) {
1441 ctask->datadigest = *digest;
1442 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1443 } else
1444 ctask->digest_count = 4;
1445 return rc;
1446 }
1447
1448 /**
1449 * iscsi_solicit_data_cont - initialize next Data-Out
1450 * @conn: iscsi connection
1451 * @ctask: scsi command task
1452 * @r2t: R2T info
1453 * @left: bytes left to transfer
1454 *
1455 * Notes:
1456 * Initialize next Data-Out within this R2T sequence and continue
1457 * to process next Scatter-Gather element(if any) of this SCSI command.
1458 *
1459 * Called under connection lock.
1460 **/
1461 static void
1462 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1463 struct iscsi_r2t_info *r2t, int left)
1464 {
1465 struct iscsi_data *hdr;
1466 struct iscsi_data_task *dtask;
1467 struct scsi_cmnd *sc = ctask->sc;
1468 int new_offset;
1469
1470 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1471 BUG_ON(!dtask);
1472 hdr = &dtask->hdr;
1473 memset(hdr, 0, sizeof(struct iscsi_data));
1474 hdr->ttt = r2t->ttt;
1475 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1476 r2t->solicit_datasn++;
1477 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1478 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1479 hdr->itt = ctask->hdr.itt;
1480 hdr->exp_statsn = r2t->exp_statsn;
1481 new_offset = r2t->data_offset + r2t->sent;
1482 hdr->offset = cpu_to_be32(new_offset);
1483 if (left > conn->max_xmit_dlength) {
1484 hton24(hdr->dlength, conn->max_xmit_dlength);
1485 r2t->data_count = conn->max_xmit_dlength;
1486 } else {
1487 hton24(hdr->dlength, left);
1488 r2t->data_count = left;
1489 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1490 }
1491 conn->dataout_pdus_cnt++;
1492
1493 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
1494 sizeof(struct iscsi_hdr));
1495
1496 r2t->dtask = dtask;
1497
1498 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1499 BUG_ON(ctask->bad_sg == r2t->sg);
1500 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1501 r2t->sg += 1;
1502 } else
1503 iscsi_buf_init_iov(&ctask->sendbuf,
1504 (char*)sc->request_buffer + new_offset,
1505 r2t->data_count);
1506
1507 list_add(&dtask->item, &ctask->dataqueue);
1508 }
1509
1510 static void
1511 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1512 {
1513 struct iscsi_data *hdr;
1514 struct iscsi_data_task *dtask;
1515
1516 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1517 BUG_ON(!dtask);
1518 hdr = &dtask->hdr;
1519 memset(hdr, 0, sizeof(struct iscsi_data));
1520 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
1521 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
1522 ctask->unsol_datasn++;
1523 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1524 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1525 hdr->itt = ctask->hdr.itt;
1526 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
1527 hdr->offset = cpu_to_be32(ctask->total_length -
1528 ctask->r2t_data_count -
1529 ctask->unsol_count);
1530 if (ctask->unsol_count > conn->max_xmit_dlength) {
1531 hton24(hdr->dlength, conn->max_xmit_dlength);
1532 ctask->data_count = conn->max_xmit_dlength;
1533 hdr->flags = 0;
1534 } else {
1535 hton24(hdr->dlength, ctask->unsol_count);
1536 ctask->data_count = ctask->unsol_count;
1537 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1538 }
1539
1540 iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
1541 sizeof(struct iscsi_hdr));
1542
1543 list_add(&dtask->item, &ctask->dataqueue);
1544
1545 ctask->dtask = dtask;
1546 }
1547
1548 /**
1549 * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1550 * @conn: iscsi connection
1551 * @ctask: scsi command task
1552 * @sc: scsi command
1553 **/
1554 static void
1555 iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1556 struct scsi_cmnd *sc)
1557 {
1558 struct iscsi_session *session = conn->session;
1559
1560 BUG_ON(__kfifo_len(ctask->r2tqueue));
1561
1562 ctask->sc = sc;
1563 ctask->conn = conn;
1564 ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
1565 ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
1566 int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
1567 ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
1568 (session->age << AGE_SHIFT);
1569 ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
1570 ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
1571 ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
1572 memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
1573 memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
1574
1575 ctask->mtask = NULL;
1576 ctask->sent = 0;
1577 ctask->sg_count = 0;
1578
1579 ctask->total_length = sc->request_bufflen;
1580
1581 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1582 ctask->exp_r2tsn = 0;
1583 ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
1584 BUG_ON(ctask->total_length == 0);
1585 if (sc->use_sg) {
1586 struct scatterlist *sg = sc->request_buffer;
1587
1588 iscsi_buf_init_sg(&ctask->sendbuf,
1589 &sg[ctask->sg_count++]);
1590 ctask->sg = sg;
1591 ctask->bad_sg = sg + sc->use_sg;
1592 } else {
1593 iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
1594 sc->request_bufflen);
1595 }
1596
1597 /*
1598 * Write counters:
1599 *
1600 * imm_count bytes to be sent right after
1601 * SCSI PDU Header
1602 *
1603 * unsol_count bytes(as Data-Out) to be sent
1604 * without R2T ack right after
1605 * immediate data
1606 *
1607 * r2t_data_count bytes to be sent via R2T ack's
1608 *
1609 * pad_count bytes to be sent as zero-padding
1610 */
1611 ctask->imm_count = 0;
1612 ctask->unsol_count = 0;
1613 ctask->unsol_datasn = 0;
1614 ctask->xmstate = XMSTATE_W_HDR;
1615 /* calculate write padding */
1616 ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1617 if (ctask->pad_count) {
1618 ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
1619 debug_scsi("write padding %d bytes\n",
1620 ctask->pad_count);
1621 ctask->xmstate |= XMSTATE_W_PAD;
1622 }
1623 if (session->imm_data_en) {
1624 if (ctask->total_length >= session->first_burst)
1625 ctask->imm_count = min(session->first_burst,
1626 conn->max_xmit_dlength);
1627 else
1628 ctask->imm_count = min(ctask->total_length,
1629 conn->max_xmit_dlength);
1630 hton24(ctask->hdr.dlength, ctask->imm_count);
1631 ctask->xmstate |= XMSTATE_IMM_DATA;
1632 } else
1633 zero_data(ctask->hdr.dlength);
1634
1635 if (!session->initial_r2t_en)
1636 ctask->unsol_count = min(session->first_burst,
1637 ctask->total_length) - ctask->imm_count;
1638 if (!ctask->unsol_count)
1639 /* No unsolicit Data-Out's */
1640 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1641 else
1642 ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1643
1644 ctask->r2t_data_count = ctask->total_length -
1645 ctask->imm_count -
1646 ctask->unsol_count;
1647
1648 debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
1649 "r2t_data %d]\n",
1650 ctask->itt, ctask->total_length, ctask->imm_count,
1651 ctask->unsol_count, ctask->r2t_data_count);
1652 } else {
1653 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1654 if (sc->sc_data_direction == DMA_FROM_DEVICE)
1655 ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
1656 ctask->datasn = 0;
1657 ctask->xmstate = XMSTATE_R_HDR;
1658 zero_data(ctask->hdr.dlength);
1659 }
1660
1661 iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
1662 sizeof(struct iscsi_hdr));
1663 conn->scsicmd_pdus_cnt++;
1664 }
1665
1666 /**
1667 * iscsi_mtask_xmit - xmit management(immediate) task
1668 * @conn: iscsi connection
1669 * @mtask: task management task
1670 *
1671 * Notes:
1672 * The function can return -EAGAIN in which case caller must
1673 * call it again later, or recover. '0' return code means successful
1674 * xmit.
1675 *
1676 * Management xmit state machine consists of two states:
1677 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1678 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1679 **/
1680 static int
1681 iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1682 {
1683
1684 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1685 conn->id, mtask->xmstate, mtask->itt);
1686
1687 if (mtask->xmstate & XMSTATE_IMM_HDR) {
1688 mtask->xmstate &= ~XMSTATE_IMM_HDR;
1689 if (mtask->data_count)
1690 mtask->xmstate |= XMSTATE_IMM_DATA;
1691 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1692 conn->stop_stage != STOP_CONN_RECOVER &&
1693 conn->hdrdgst_en)
1694 iscsi_hdr_digest(conn, &mtask->headbuf,
1695 (u8*)mtask->hdrext);
1696 if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
1697 mtask->xmstate |= XMSTATE_IMM_HDR;
1698 if (mtask->data_count)
1699 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1700 return -EAGAIN;
1701 }
1702 }
1703
1704 if (mtask->xmstate & XMSTATE_IMM_DATA) {
1705 BUG_ON(!mtask->data_count);
1706 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1707 /* FIXME: implement.
1708 * Virtual buffer could be spreaded across multiple pages...
1709 */
1710 do {
1711 if (iscsi_sendpage(conn, &mtask->sendbuf,
1712 &mtask->data_count, &mtask->sent)) {
1713 mtask->xmstate |= XMSTATE_IMM_DATA;
1714 return -EAGAIN;
1715 }
1716 } while (mtask->data_count);
1717 }
1718
1719 BUG_ON(mtask->xmstate != XMSTATE_IDLE);
1720 return 0;
1721 }
1722
1723 static inline int
1724 handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1725 {
1726 ctask->xmstate &= ~XMSTATE_R_HDR;
1727 if (conn->hdrdgst_en)
1728 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1729 if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
1730 BUG_ON(ctask->xmstate != XMSTATE_IDLE);
1731 return 0; /* wait for Data-In */
1732 }
1733 ctask->xmstate |= XMSTATE_R_HDR;
1734 return -EAGAIN;
1735 }
1736
1737 static inline int
1738 handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1739 {
1740 ctask->xmstate &= ~XMSTATE_W_HDR;
1741 if (conn->hdrdgst_en)
1742 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1743 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
1744 ctask->xmstate |= XMSTATE_W_HDR;
1745 return -EAGAIN;
1746 }
1747 return 0;
1748 }
1749
1750 static inline int
1751 handle_xmstate_data_digest(struct iscsi_conn *conn,
1752 struct iscsi_cmd_task *ctask)
1753 {
1754 ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1755 debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
1756 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1757 &ctask->datadigest, 0)) {
1758 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1759 debug_tcp("resent data digest 0x%x fail!\n",
1760 ctask->datadigest);
1761 return -EAGAIN;
1762 }
1763 return 0;
1764 }
1765
1766 static inline int
1767 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1768 {
1769 BUG_ON(!ctask->imm_count);
1770 ctask->xmstate &= ~XMSTATE_IMM_DATA;
1771
1772 if (conn->datadgst_en) {
1773 iscsi_data_digest_init(conn, ctask);
1774 ctask->immdigest = 0;
1775 }
1776
1777 for (;;) {
1778 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
1779 &ctask->sent)) {
1780 ctask->xmstate |= XMSTATE_IMM_DATA;
1781 if (conn->datadgst_en) {
1782 crypto_digest_final(conn->data_tx_tfm,
1783 (u8*)&ctask->immdigest);
1784 debug_tcp("tx imm sendpage fail 0x%x\n",
1785 ctask->datadigest);
1786 }
1787 return -EAGAIN;
1788 }
1789 if (conn->datadgst_en)
1790 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1791
1792 if (!ctask->imm_count)
1793 break;
1794 iscsi_buf_init_sg(&ctask->sendbuf,
1795 &ctask->sg[ctask->sg_count++]);
1796 }
1797
1798 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1799 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1800 &ctask->immdigest, 1)) {
1801 debug_tcp("sending imm digest 0x%x fail!\n",
1802 ctask->immdigest);
1803 return -EAGAIN;
1804 }
1805 debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
1806 }
1807
1808 return 0;
1809 }
1810
1811 static inline int
1812 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1813 {
1814 struct iscsi_data_task *dtask;
1815
1816 ctask->xmstate |= XMSTATE_UNS_DATA;
1817 if (ctask->xmstate & XMSTATE_UNS_INIT) {
1818 iscsi_unsolicit_data_init(conn, ctask);
1819 BUG_ON(!ctask->dtask);
1820 dtask = ctask->dtask;
1821 if (conn->hdrdgst_en)
1822 iscsi_hdr_digest(conn, &ctask->headbuf,
1823 (u8*)dtask->hdrext);
1824 ctask->xmstate &= ~XMSTATE_UNS_INIT;
1825 }
1826 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
1827 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1828 ctask->xmstate |= XMSTATE_UNS_HDR;
1829 return -EAGAIN;
1830 }
1831
1832 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1833 ctask->itt, ctask->unsol_count, ctask->sent);
1834 return 0;
1835 }
1836
1837 static inline int
1838 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1839 {
1840 struct iscsi_data_task *dtask = ctask->dtask;
1841
1842 BUG_ON(!ctask->data_count);
1843 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1844
1845 if (conn->datadgst_en) {
1846 iscsi_data_digest_init(conn, ctask);
1847 dtask->digest = 0;
1848 }
1849
1850 for (;;) {
1851 int start = ctask->sent;
1852
1853 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
1854 &ctask->sent)) {
1855 ctask->unsol_count -= ctask->sent - start;
1856 ctask->xmstate |= XMSTATE_UNS_DATA;
1857 /* will continue with this ctask later.. */
1858 if (conn->datadgst_en) {
1859 crypto_digest_final(conn->data_tx_tfm,
1860 (u8 *)&dtask->digest);
1861 debug_tcp("tx uns data fail 0x%x\n",
1862 dtask->digest);
1863 }
1864 return -EAGAIN;
1865 }
1866
1867 BUG_ON(ctask->sent > ctask->total_length);
1868 ctask->unsol_count -= ctask->sent - start;
1869
1870 /*
1871 * XXX:we may run here with un-initial sendbuf.
1872 * so pass it
1873 */
1874 if (conn->datadgst_en && ctask->sent - start > 0)
1875 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1876
1877 if (!ctask->data_count)
1878 break;
1879 iscsi_buf_init_sg(&ctask->sendbuf,
1880 &ctask->sg[ctask->sg_count++]);
1881 }
1882 BUG_ON(ctask->unsol_count < 0);
1883
1884 /*
1885 * Done with the Data-Out. Next, check if we need
1886 * to send another unsolicited Data-Out.
1887 */
1888 if (ctask->unsol_count) {
1889 if (conn->datadgst_en) {
1890 if (iscsi_digest_final_send(conn, ctask,
1891 &dtask->digestbuf,
1892 &dtask->digest, 1)) {
1893 debug_tcp("send uns digest 0x%x fail\n",
1894 dtask->digest);
1895 return -EAGAIN;
1896 }
1897 debug_tcp("sending uns digest 0x%x, more uns\n",
1898 dtask->digest);
1899 }
1900 ctask->xmstate |= XMSTATE_UNS_INIT;
1901 return 1;
1902 }
1903
1904 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1905 if (iscsi_digest_final_send(conn, ctask,
1906 &dtask->digestbuf,
1907 &dtask->digest, 1)) {
1908 debug_tcp("send last uns digest 0x%x fail\n",
1909 dtask->digest);
1910 return -EAGAIN;
1911 }
1912 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1913 }
1914
1915 return 0;
1916 }
1917
1918 static inline int
1919 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1920 {
1921 struct iscsi_session *session = conn->session;
1922 struct iscsi_r2t_info *r2t = ctask->r2t;
1923 struct iscsi_data_task *dtask = r2t->dtask;
1924 int left;
1925
1926 ctask->xmstate &= ~XMSTATE_SOL_DATA;
1927 ctask->dtask = dtask;
1928
1929 if (conn->datadgst_en) {
1930 iscsi_data_digest_init(conn, ctask);
1931 dtask->digest = 0;
1932 }
1933 solicit_again:
1934 /*
1935 * send Data-Out whitnin this R2T sequence.
1936 */
1937 if (!r2t->data_count)
1938 goto data_out_done;
1939
1940 if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
1941 ctask->xmstate |= XMSTATE_SOL_DATA;
1942 /* will continue with this ctask later.. */
1943 if (conn->datadgst_en) {
1944 crypto_digest_final(conn->data_tx_tfm,
1945 (u8 *)&dtask->digest);
1946 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1947 }
1948 return -EAGAIN;
1949 }
1950
1951 BUG_ON(r2t->data_count < 0);
1952 if (conn->datadgst_en)
1953 iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
1954
1955 if (r2t->data_count) {
1956 BUG_ON(ctask->sc->use_sg == 0);
1957 if (!iscsi_buf_left(&r2t->sendbuf)) {
1958 BUG_ON(ctask->bad_sg == r2t->sg);
1959 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1960 r2t->sg += 1;
1961 }
1962 goto solicit_again;
1963 }
1964
1965 data_out_done:
1966 /*
1967 * Done with this Data-Out. Next, check if we have
1968 * to send another Data-Out for this R2T.
1969 */
1970 BUG_ON(r2t->data_length - r2t->sent < 0);
1971 left = r2t->data_length - r2t->sent;
1972 if (left) {
1973 if (conn->datadgst_en) {
1974 if (iscsi_digest_final_send(conn, ctask,
1975 &dtask->digestbuf,
1976 &dtask->digest, 1)) {
1977 debug_tcp("send r2t data digest 0x%x"
1978 "fail\n", dtask->digest);
1979 return -EAGAIN;
1980 }
1981 debug_tcp("r2t data send digest 0x%x\n",
1982 dtask->digest);
1983 }
1984 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1985 ctask->xmstate |= XMSTATE_SOL_DATA;
1986 ctask->xmstate &= ~XMSTATE_SOL_HDR;
1987 return 1;
1988 }
1989
1990 /*
1991 * Done with this R2T. Check if there are more
1992 * outstanding R2Ts ready to be processed.
1993 */
1994 BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
1995 if (conn->datadgst_en) {
1996 if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
1997 &dtask->digest, 1)) {
1998 debug_tcp("send last r2t data digest 0x%x"
1999 "fail\n", dtask->digest);
2000 return -EAGAIN;
2001 }
2002 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
2003 }
2004
2005 ctask->r2t_data_count -= r2t->data_length;
2006 ctask->r2t = NULL;
2007 spin_lock_bh(&session->lock);
2008 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
2009 spin_unlock_bh(&session->lock);
2010 if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
2011 ctask->r2t = r2t;
2012 ctask->xmstate |= XMSTATE_SOL_DATA;
2013 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2014 return 1;
2015 }
2016
2017 return 0;
2018 }
2019
2020 static inline int
2021 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2022 {
2023 struct iscsi_data_task *dtask = ctask->dtask;
2024 int sent;
2025
2026 ctask->xmstate &= ~XMSTATE_W_PAD;
2027 iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
2028 ctask->pad_count);
2029 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
2030 ctask->xmstate |= XMSTATE_W_PAD;
2031 return -EAGAIN;
2032 }
2033
2034 if (conn->datadgst_en) {
2035 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
2036 /* imm data? */
2037 if (!dtask) {
2038 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
2039 &ctask->immdigest, 1)) {
2040 debug_tcp("send padding digest 0x%x"
2041 "fail!\n", ctask->immdigest);
2042 return -EAGAIN;
2043 }
2044 debug_tcp("done with padding, digest 0x%x\n",
2045 ctask->datadigest);
2046 } else {
2047 if (iscsi_digest_final_send(conn, ctask,
2048 &dtask->digestbuf,
2049 &dtask->digest, 1)) {
2050 debug_tcp("send padding digest 0x%x"
2051 "fail\n", dtask->digest);
2052 return -EAGAIN;
2053 }
2054 debug_tcp("done with padding, digest 0x%x\n",
2055 dtask->digest);
2056 }
2057 }
2058
2059 return 0;
2060 }
2061
2062 static int
2063 iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2064 {
2065 int rc = 0;
2066
2067 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
2068 conn->id, ctask->xmstate, ctask->itt);
2069
2070 /*
2071 * serialize with TMF AbortTask
2072 */
2073 if (ctask->mtask)
2074 return rc;
2075
2076 if (ctask->xmstate & XMSTATE_R_HDR) {
2077 rc = handle_xmstate_r_hdr(conn, ctask);
2078 return rc;
2079 }
2080
2081 if (ctask->xmstate & XMSTATE_W_HDR) {
2082 rc = handle_xmstate_w_hdr(conn, ctask);
2083 if (rc)
2084 return rc;
2085 }
2086
2087 /* XXX: for data digest xmit recover */
2088 if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
2089 rc = handle_xmstate_data_digest(conn, ctask);
2090 if (rc)
2091 return rc;
2092 }
2093
2094 if (ctask->xmstate & XMSTATE_IMM_DATA) {
2095 rc = handle_xmstate_imm_data(conn, ctask);
2096 if (rc)
2097 return rc;
2098 }
2099
2100 if (ctask->xmstate & XMSTATE_UNS_HDR) {
2101 BUG_ON(!ctask->unsol_count);
2102 ctask->xmstate &= ~XMSTATE_UNS_HDR;
2103 unsolicit_head_again:
2104 rc = handle_xmstate_uns_hdr(conn, ctask);
2105 if (rc)
2106 return rc;
2107 }
2108
2109 if (ctask->xmstate & XMSTATE_UNS_DATA) {
2110 rc = handle_xmstate_uns_data(conn, ctask);
2111 if (rc == 1)
2112 goto unsolicit_head_again;
2113 else if (rc)
2114 return rc;
2115 goto done;
2116 }
2117
2118 if (ctask->xmstate & XMSTATE_SOL_HDR) {
2119 struct iscsi_r2t_info *r2t;
2120
2121 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2122 ctask->xmstate |= XMSTATE_SOL_DATA;
2123 if (!ctask->r2t)
2124 __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
2125 sizeof(void*));
2126 solicit_head_again:
2127 r2t = ctask->r2t;
2128 if (conn->hdrdgst_en)
2129 iscsi_hdr_digest(conn, &r2t->headbuf,
2130 (u8*)r2t->dtask->hdrext);
2131 if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
2132 ctask->xmstate &= ~XMSTATE_SOL_DATA;
2133 ctask->xmstate |= XMSTATE_SOL_HDR;
2134 return -EAGAIN;
2135 }
2136
2137 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
2138 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
2139 r2t->sent);
2140 }
2141
2142 if (ctask->xmstate & XMSTATE_SOL_DATA) {
2143 rc = handle_xmstate_sol_data(conn, ctask);
2144 if (rc == 1)
2145 goto solicit_head_again;
2146 if (rc)
2147 return rc;
2148 }
2149
2150 done:
2151 /*
2152 * Last thing to check is whether we need to send write
2153 * padding. Note that we check for xmstate equality, not just the bit.
2154 */
2155 if (ctask->xmstate == XMSTATE_W_PAD)
2156 rc = handle_xmstate_w_pad(conn, ctask);
2157
2158 return rc;
2159 }
2160
2161 /**
2162 * iscsi_data_xmit - xmit any command into the scheduled connection
2163 * @conn: iscsi connection
2164 *
2165 * Notes:
2166 * The function can return -EAGAIN in which case the caller must
2167 * re-schedule it again later or recover. '0' return code means
2168 * successful xmit.
2169 **/
2170 static int
2171 iscsi_data_xmit(struct iscsi_conn *conn)
2172 {
2173 if (unlikely(conn->suspend_tx)) {
2174 debug_tcp("conn %d Tx suspended!\n", conn->id);
2175 return 0;
2176 }
2177
2178 /*
2179 * Transmit in the following order:
2180 *
2181 * 1) un-finished xmit (ctask or mtask)
2182 * 2) immediate control PDUs
2183 * 3) write data
2184 * 4) SCSI commands
2185 * 5) non-immediate control PDUs
2186 *
2187 * No need to lock around __kfifo_get as long as
2188 * there's one producer and one consumer.
2189 */
2190
2191 BUG_ON(conn->ctask && conn->mtask);
2192
2193 if (conn->ctask) {
2194 if (iscsi_ctask_xmit(conn, conn->ctask))
2195 goto again;
2196 /* done with this in-progress ctask */
2197 conn->ctask = NULL;
2198 }
2199 if (conn->mtask) {
2200 if (iscsi_mtask_xmit(conn, conn->mtask))
2201 goto again;
2202 /* done with this in-progress mtask */
2203 conn->mtask = NULL;
2204 }
2205
2206 /* process immediate first */
2207 if (unlikely(__kfifo_len(conn->immqueue))) {
2208 struct iscsi_session *session = conn->session;
2209 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
2210 sizeof(void*))) {
2211 if (iscsi_mtask_xmit(conn, conn->mtask))
2212 goto again;
2213
2214 if (conn->mtask->hdr.itt ==
2215 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2216 spin_lock_bh(&session->lock);
2217 __kfifo_put(session->mgmtpool.queue,
2218 (void*)&conn->mtask, sizeof(void*));
2219 spin_unlock_bh(&session->lock);
2220 }
2221 }
2222 /* done with this mtask */
2223 conn->mtask = NULL;
2224 }
2225
2226 /* process write queue */
2227 while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
2228 sizeof(void*))) {
2229 if (iscsi_ctask_xmit(conn, conn->ctask))
2230 goto again;
2231 }
2232
2233 /* process command queue */
2234 while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
2235 sizeof(void*))) {
2236 if (iscsi_ctask_xmit(conn, conn->ctask))
2237 goto again;
2238 }
2239 /* done with this ctask */
2240 conn->ctask = NULL;
2241
2242 /* process the rest control plane PDUs, if any */
2243 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
2244 struct iscsi_session *session = conn->session;
2245
2246 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
2247 sizeof(void*))) {
2248 if (iscsi_mtask_xmit(conn, conn->mtask))
2249 goto again;
2250
2251 if (conn->mtask->hdr.itt ==
2252 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2253 spin_lock_bh(&session->lock);
2254 __kfifo_put(session->mgmtpool.queue,
2255 (void*)&conn->mtask,
2256 sizeof(void*));
2257 spin_unlock_bh(&session->lock);
2258 }
2259 }
2260 /* done with this mtask */
2261 conn->mtask = NULL;
2262 }
2263
2264 return 0;
2265
2266 again:
2267 if (unlikely(conn->suspend_tx))
2268 return 0;
2269
2270 return -EAGAIN;
2271 }
2272
2273 static void
2274 iscsi_xmitworker(void *data)
2275 {
2276 struct iscsi_conn *conn = data;
2277
2278 /*
2279 * serialize Xmit worker on a per-connection basis.
2280 */
2281 down(&conn->xmitsema);
2282 if (iscsi_data_xmit(conn))
2283 schedule_work(&conn->xmitwork);
2284 up(&conn->xmitsema);
2285 }
2286
2287 #define FAILURE_BAD_HOST 1
2288 #define FAILURE_SESSION_FAILED 2
2289 #define FAILURE_SESSION_FREED 3
2290 #define FAILURE_WINDOW_CLOSED 4
2291 #define FAILURE_SESSION_TERMINATE 5
2292
2293 static int
2294 iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
2295 {
2296 struct Scsi_Host *host;
2297 int reason = 0;
2298 struct iscsi_session *session;
2299 struct iscsi_conn *conn = NULL;
2300 struct iscsi_cmd_task *ctask = NULL;
2301
2302 sc->scsi_done = done;
2303 sc->result = 0;
2304
2305 host = sc->device->host;
2306 session = iscsi_hostdata(host->hostdata);
2307 BUG_ON(host != session->host);
2308
2309 spin_lock(&session->lock);
2310
2311 if (session->state != ISCSI_STATE_LOGGED_IN) {
2312 if (session->state == ISCSI_STATE_FAILED) {
2313 reason = FAILURE_SESSION_FAILED;
2314 goto reject;
2315 } else if (session->state == ISCSI_STATE_TERMINATE) {
2316 reason = FAILURE_SESSION_TERMINATE;
2317 goto fault;
2318 }
2319 reason = FAILURE_SESSION_FREED;
2320 goto fault;
2321 }
2322
2323 /*
2324 * Check for iSCSI window and take care of CmdSN wrap-around
2325 */
2326 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
2327 reason = FAILURE_WINDOW_CLOSED;
2328 goto reject;
2329 }
2330
2331 conn = session->leadconn;
2332
2333 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
2334 BUG_ON(ctask->sc);
2335
2336 sc->SCp.phase = session->age;
2337 sc->SCp.ptr = (char*)ctask;
2338 iscsi_cmd_init(conn, ctask, sc);
2339
2340 __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
2341 debug_scsi(
2342 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
2343 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
2344 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
2345 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
2346 spin_unlock(&session->lock);
2347
2348 if (!in_interrupt() && !down_trylock(&conn->xmitsema)) {
2349 spin_unlock_irq(host->host_lock);
2350 if (iscsi_data_xmit(conn))
2351 schedule_work(&conn->xmitwork);
2352 up(&conn->xmitsema);
2353 spin_lock_irq(host->host_lock);
2354 } else
2355 schedule_work(&conn->xmitwork);
2356
2357 return 0;
2358
2359 reject:
2360 spin_unlock(&session->lock);
2361 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
2362 return SCSI_MLQUEUE_HOST_BUSY;
2363
2364 fault:
2365 spin_unlock(&session->lock);
2366 printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
2367 sc->cmnd[0], reason);
2368 sc->sense_buffer[0] = 0x70;
2369 sc->sense_buffer[2] = NOT_READY;
2370 sc->sense_buffer[7] = 0x6;
2371 sc->sense_buffer[12] = 0x08;
2372 sc->sense_buffer[13] = 0x00;
2373 sc->result = (DID_NO_CONNECT << 16);
2374 sc->resid = sc->request_bufflen;
2375 sc->scsi_done(sc);
2376 return 0;
2377 }
2378
2379 static int
2380 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
2381 {
2382 int i;
2383
2384 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
2385 if (*items == NULL)
2386 return -ENOMEM;
2387
2388 q->max = max;
2389 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
2390 if (q->pool == NULL) {
2391 kfree(*items);
2392 return -ENOMEM;
2393 }
2394
2395 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2396 GFP_KERNEL, NULL);
2397 if (q->queue == ERR_PTR(-ENOMEM)) {
2398 kfree(q->pool);
2399 kfree(*items);
2400 return -ENOMEM;
2401 }
2402
2403 for (i = 0; i < max; i++) {
2404 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
2405 if (q->pool[i] == NULL) {
2406 int j;
2407
2408 for (j = 0; j < i; j++)
2409 kfree(q->pool[j]);
2410
2411 kfifo_free(q->queue);
2412 kfree(q->pool);
2413 kfree(*items);
2414 return -ENOMEM;
2415 }
2416 memset(q->pool[i], 0, item_size);
2417 (*items)[i] = q->pool[i];
2418 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2419 }
2420 return 0;
2421 }
2422
2423 static void
2424 iscsi_pool_free(struct iscsi_queue *q, void **items)
2425 {
2426 int i;
2427
2428 for (i = 0; i < q->max; i++)
2429 kfree(items[i]);
2430 kfree(q->pool);
2431 kfree(items);
2432 }
2433
2434 static iscsi_connh_t
2435 iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
2436 {
2437 struct iscsi_session *session = iscsi_ptr(sessionh);
2438 struct iscsi_conn *conn = NULL;
2439
2440 conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
2441 if (conn == NULL)
2442 goto conn_alloc_fail;
2443 memset(conn, 0, sizeof(struct iscsi_conn));
2444
2445 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2446 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2447 conn->id = conn_idx;
2448 conn->exp_statsn = 0;
2449 conn->tmabort_state = TMABORT_INITIAL;
2450
2451 /* initial operational parameters */
2452 conn->hdr_size = sizeof(struct iscsi_hdr);
2453 conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2454 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2455
2456 spin_lock_init(&conn->lock);
2457
2458 /* initialize general xmit PDU commands queue */
2459 conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
2460 GFP_KERNEL, NULL);
2461 if (conn->xmitqueue == ERR_PTR(-ENOMEM))
2462 goto xmitqueue_alloc_fail;
2463
2464 /* initialize write response PDU commands queue */
2465 conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
2466 GFP_KERNEL, NULL);
2467 if (conn->writequeue == ERR_PTR(-ENOMEM))
2468 goto writequeue_alloc_fail;
2469
2470 /* initialize general immediate & non-immediate PDU commands queue */
2471 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2472 GFP_KERNEL, NULL);
2473 if (conn->immqueue == ERR_PTR(-ENOMEM))
2474 goto immqueue_alloc_fail;
2475
2476 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2477 GFP_KERNEL, NULL);
2478 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
2479 goto mgmtqueue_alloc_fail;
2480
2481 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
2482
2483 /* allocate login_mtask used for the login/text sequences */
2484 spin_lock_bh(&session->lock);
2485 if (!__kfifo_get(session->mgmtpool.queue,
2486 (void*)&conn->login_mtask,
2487 sizeof(void*))) {
2488 spin_unlock_bh(&session->lock);
2489 goto login_mtask_alloc_fail;
2490 }
2491 spin_unlock_bh(&session->lock);
2492
2493 /* allocate initial PDU receive place holder */
2494 if (conn->data_size <= PAGE_SIZE)
2495 conn->data = kmalloc(conn->data_size, GFP_KERNEL);
2496 else
2497 conn->data = (void*)__get_free_pages(GFP_KERNEL,
2498 get_order(conn->data_size));
2499 if (!conn->data)
2500 goto max_recv_dlenght_alloc_fail;
2501
2502 init_timer(&conn->tmabort_timer);
2503 init_MUTEX(&conn->xmitsema);
2504 init_waitqueue_head(&conn->ehwait);
2505
2506 return iscsi_handle(conn);
2507
2508 max_recv_dlenght_alloc_fail:
2509 spin_lock_bh(&session->lock);
2510 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2511 sizeof(void*));
2512 spin_unlock_bh(&session->lock);
2513 login_mtask_alloc_fail:
2514 kfifo_free(conn->mgmtqueue);
2515 mgmtqueue_alloc_fail:
2516 kfifo_free(conn->immqueue);
2517 immqueue_alloc_fail:
2518 kfifo_free(conn->writequeue);
2519 writequeue_alloc_fail:
2520 kfifo_free(conn->xmitqueue);
2521 xmitqueue_alloc_fail:
2522 kfree(conn);
2523 conn_alloc_fail:
2524 return iscsi_handle(NULL);
2525 }
2526
2527 static void
2528 iscsi_conn_destroy(iscsi_connh_t connh)
2529 {
2530 struct iscsi_conn *conn = iscsi_ptr(connh);
2531 struct iscsi_session *session = conn->session;
2532
2533 down(&conn->xmitsema);
2534 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2535 if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
2536 struct sock *sk = conn->sock->sk;
2537
2538 /*
2539 * conn_start() has never been called!
2540 * need to cleanup the socket.
2541 */
2542 write_lock_bh(&sk->sk_callback_lock);
2543 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2544 write_unlock_bh(&sk->sk_callback_lock);
2545
2546 sock_hold(conn->sock->sk);
2547 iscsi_conn_restore_callbacks(conn);
2548 sock_put(conn->sock->sk);
2549 sock_release(conn->sock);
2550 conn->sock = NULL;
2551 }
2552
2553 spin_lock_bh(&session->lock);
2554 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2555 if (session->leadconn == conn) {
2556 /*
2557 * leading connection? then give up on recovery.
2558 */
2559 session->state = ISCSI_STATE_TERMINATE;
2560 wake_up(&conn->ehwait);
2561 }
2562 spin_unlock_bh(&session->lock);
2563
2564 up(&conn->xmitsema);
2565
2566 /*
2567 * Block until all in-progress commands for this connection
2568 * time out or fail.
2569 */
2570 for (;;) {
2571 spin_lock_bh(&conn->lock);
2572 if (!session->host->host_busy) { /* OK for ERL == 0 */
2573 spin_unlock_bh(&conn->lock);
2574 break;
2575 }
2576 spin_unlock_bh(&conn->lock);
2577 msleep_interruptible(500);
2578 printk("conn_destroy(): host_busy %d host_failed %d\n",
2579 session->host->host_busy, session->host->host_failed);
2580 /*
2581 * force eh_abort() to unblock
2582 */
2583 wake_up(&conn->ehwait);
2584 }
2585
2586 /* now free crypto */
2587 if (conn->hdrdgst_en || conn->datadgst_en) {
2588 if (conn->tx_tfm)
2589 crypto_free_tfm(conn->tx_tfm);
2590 if (conn->rx_tfm)
2591 crypto_free_tfm(conn->rx_tfm);
2592 if (conn->data_tx_tfm)
2593 crypto_free_tfm(conn->data_tx_tfm);
2594 if (conn->data_rx_tfm)
2595 crypto_free_tfm(conn->data_rx_tfm);
2596 }
2597
2598 /* free conn->data, size = MaxRecvDataSegmentLength */
2599 if (conn->data_size <= PAGE_SIZE)
2600 kfree(conn->data);
2601 else
2602 free_pages((unsigned long)conn->data,
2603 get_order(conn->data_size));
2604
2605 spin_lock_bh(&session->lock);
2606 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2607 sizeof(void*));
2608 list_del(&conn->item);
2609 if (list_empty(&session->connections))
2610 session->leadconn = NULL;
2611 if (session->leadconn && session->leadconn == conn)
2612 session->leadconn = container_of(session->connections.next,
2613 struct iscsi_conn, item);
2614
2615 if (session->leadconn == NULL)
2616 /* none connections exits.. reset sequencing */
2617 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
2618 spin_unlock_bh(&session->lock);
2619
2620 kfifo_free(conn->xmitqueue);
2621 kfifo_free(conn->writequeue);
2622 kfifo_free(conn->immqueue);
2623 kfifo_free(conn->mgmtqueue);
2624 kfree(conn);
2625 }
2626
2627 static int
2628 iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
2629 uint32_t transport_fd, int is_leading)
2630 {
2631 struct iscsi_session *session = iscsi_ptr(sessionh);
2632 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
2633 struct sock *sk;
2634 struct socket *sock;
2635 int err;
2636
2637 /* lookup for existing socket */
2638 sock = sockfd_lookup(transport_fd, &err);
2639 if (!sock) {
2640 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2641 return -EEXIST;
2642 }
2643
2644 /* lookup for existing connection */
2645 spin_lock_bh(&session->lock);
2646 list_for_each_entry(tmp, &session->connections, item) {
2647 if (tmp == conn) {
2648 if (conn->c_stage != ISCSI_CONN_STOPPED ||
2649 conn->stop_stage == STOP_CONN_TERM) {
2650 printk(KERN_ERR "iscsi_tcp: can't bind "
2651 "non-stopped connection (%d:%d)\n",
2652 conn->c_stage, conn->stop_stage);
2653 spin_unlock_bh(&session->lock);
2654 return -EIO;
2655 }
2656 break;
2657 }
2658 }
2659 if (tmp != conn) {
2660 /* bind new iSCSI connection to session */
2661 conn->session = session;
2662
2663 list_add(&conn->item, &session->connections);
2664 }
2665 spin_unlock_bh(&session->lock);
2666
2667 if (conn->stop_stage != STOP_CONN_SUSPEND) {
2668 /* bind iSCSI connection and socket */
2669 conn->sock = sock;
2670
2671 /* setup Socket parameters */
2672 sk = sock->sk;
2673 sk->sk_reuse = 1;
2674 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2675 sk->sk_allocation = GFP_ATOMIC;
2676
2677 /* FIXME: disable Nagle's algorithm */
2678
2679 /*
2680 * Intercept TCP callbacks for sendfile like receive
2681 * processing.
2682 */
2683 iscsi_conn_set_callbacks(conn);
2684
2685 /*
2686 * set receive state machine into initial state
2687 */
2688 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2689 }
2690
2691 if (is_leading)
2692 session->leadconn = conn;
2693
2694 /*
2695 * Unblock xmitworker(), Login Phase will pass through.
2696 */
2697 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2698 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2699
2700 return 0;
2701 }
2702
2703 static int
2704 iscsi_conn_start(iscsi_connh_t connh)
2705 {
2706 struct iscsi_conn *conn = iscsi_ptr(connh);
2707 struct iscsi_session *session = conn->session;
2708 struct sock *sk;
2709
2710 /* FF phase warming up... */
2711
2712 if (session == NULL) {
2713 printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
2714 return -EPERM;
2715 }
2716
2717 sk = conn->sock->sk;
2718
2719 write_lock_bh(&sk->sk_callback_lock);
2720 spin_lock_bh(&session->lock);
2721 conn->c_stage = ISCSI_CONN_STARTED;
2722 session->state = ISCSI_STATE_LOGGED_IN;
2723
2724 switch(conn->stop_stage) {
2725 case STOP_CONN_RECOVER:
2726 /*
2727 * unblock eh_abort() if it is blocked. re-try all
2728 * commands after successful recovery
2729 */
2730 session->conn_cnt++;
2731 conn->stop_stage = 0;
2732 conn->tmabort_state = TMABORT_INITIAL;
2733 session->age++;
2734 wake_up(&conn->ehwait);
2735 break;
2736 case STOP_CONN_TERM:
2737 session->conn_cnt++;
2738 conn->stop_stage = 0;
2739 break;
2740 case STOP_CONN_SUSPEND:
2741 conn->stop_stage = 0;
2742 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2743 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2744 break;
2745 default:
2746 break;
2747 }
2748 spin_unlock_bh(&session->lock);
2749 write_unlock_bh(&sk->sk_callback_lock);
2750
2751 return 0;
2752 }
2753
2754 static void
2755 iscsi_conn_stop(iscsi_connh_t connh, int flag)
2756 {
2757 struct iscsi_conn *conn = iscsi_ptr(connh);
2758 struct iscsi_session *session = conn->session;
2759 struct sock *sk;
2760 unsigned long flags;
2761
2762 BUG_ON(!conn->sock);
2763 sk = conn->sock->sk;
2764 write_lock_bh(&sk->sk_callback_lock);
2765 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2766 write_unlock_bh(&sk->sk_callback_lock);
2767
2768 down(&conn->xmitsema);
2769
2770 spin_lock_irqsave(session->host->host_lock, flags);
2771 spin_lock(&session->lock);
2772 conn->stop_stage = flag;
2773 conn->c_stage = ISCSI_CONN_STOPPED;
2774 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2775
2776 if (flag != STOP_CONN_SUSPEND)
2777 session->conn_cnt--;
2778
2779 if (session->conn_cnt == 0 || session->leadconn == conn)
2780 session->state = ISCSI_STATE_FAILED;
2781
2782 spin_unlock(&session->lock);
2783 spin_unlock_irqrestore(session->host->host_lock, flags);
2784
2785 if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
2786 struct iscsi_cmd_task *ctask;
2787 struct iscsi_mgmt_task *mtask;
2788
2789 /*
2790 * Socket must go now.
2791 */
2792 sock_hold(conn->sock->sk);
2793 iscsi_conn_restore_callbacks(conn);
2794 sock_put(conn->sock->sk);
2795
2796 /*
2797 * flush xmit queues.
2798 */
2799 spin_lock_bh(&session->lock);
2800 while (__kfifo_get(conn->writequeue, (void*)&ctask,
2801 sizeof(void*)) ||
2802 __kfifo_get(conn->xmitqueue, (void*)&ctask,
2803 sizeof(void*))) {
2804 struct iscsi_r2t_info *r2t;
2805
2806 /*
2807 * flush ctask's r2t queues
2808 */
2809 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
2810 sizeof(void*)))
2811 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
2812 sizeof(void*));
2813
2814 spin_unlock_bh(&session->lock);
2815 local_bh_disable();
2816 iscsi_ctask_cleanup(conn, ctask);
2817 local_bh_enable();
2818 spin_lock_bh(&session->lock);
2819 }
2820 conn->ctask = NULL;
2821 while (__kfifo_get(conn->immqueue, (void*)&mtask,
2822 sizeof(void*)) ||
2823 __kfifo_get(conn->mgmtqueue, (void*)&mtask,
2824 sizeof(void*))) {
2825 __kfifo_put(session->mgmtpool.queue,
2826 (void*)&mtask, sizeof(void*));
2827 }
2828 conn->mtask = NULL;
2829 spin_unlock_bh(&session->lock);
2830
2831 /*
2832 * release socket only after we stopped data_xmit()
2833 * activity and flushed all outstandings
2834 */
2835 sock_release(conn->sock);
2836 conn->sock = NULL;
2837
2838 /*
2839 * for connection level recovery we should not calculate
2840 * header digest. conn->hdr_size used for optimization
2841 * in hdr_extract() and will be re-negotiated at
2842 * set_param() time.
2843 */
2844 if (flag == STOP_CONN_RECOVER)
2845 conn->hdr_size = sizeof(struct iscsi_hdr);
2846 }
2847 up(&conn->xmitsema);
2848 }
2849
2850 static int
2851 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
2852 char *data, uint32_t data_size)
2853 {
2854 struct iscsi_session *session = conn->session;
2855 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
2856 struct iscsi_mgmt_task *mtask;
2857
2858 spin_lock_bh(&session->lock);
2859 if (session->state == ISCSI_STATE_TERMINATE) {
2860 spin_unlock_bh(&session->lock);
2861 return -EPERM;
2862 }
2863 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
2864 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
2865 /*
2866 * Login and Text are sent serially, in
2867 * request-followed-by-response sequence.
2868 * Same mtask can be used. Same ITT must be used.
2869 * Note that login_mtask is preallocated at conn_create().
2870 */
2871 mtask = conn->login_mtask;
2872 else {
2873 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
2874 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
2875
2876 if (!__kfifo_get(session->mgmtpool.queue,
2877 (void*)&mtask, sizeof(void*))) {
2878 spin_unlock_bh(&session->lock);
2879 return -ENOSPC;
2880 }
2881 }
2882
2883 /*
2884 * pre-format CmdSN and ExpStatSN for outgoing PDU.
2885 */
2886 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
2887 hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
2888 (session->age << AGE_SHIFT);
2889 nop->cmdsn = cpu_to_be32(session->cmdsn);
2890 if (conn->c_stage == ISCSI_CONN_STARTED &&
2891 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2892 session->cmdsn++;
2893 } else
2894 /* do not advance CmdSN */
2895 nop->cmdsn = cpu_to_be32(session->cmdsn);
2896
2897 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
2898
2899 memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
2900
2901 iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
2902 sizeof(struct iscsi_hdr));
2903
2904 spin_unlock_bh(&session->lock);
2905
2906 if (data_size) {
2907 memcpy(mtask->data, data, data_size);
2908 mtask->data_count = data_size;
2909 } else
2910 mtask->data_count = 0;
2911
2912 mtask->xmstate = XMSTATE_IMM_HDR;
2913
2914 if (mtask->data_count) {
2915 iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
2916 mtask->data_count);
2917 }
2918
2919 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
2920 hdr->opcode, hdr->itt, data_size);
2921
2922 /*
2923 * since send_pdu() could be called at least from two contexts,
2924 * we need to serialize __kfifo_put, so we don't have to take
2925 * additional lock on fast data-path
2926 */
2927 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
2928 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
2929 else
2930 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
2931
2932 schedule_work(&conn->xmitwork);
2933
2934 return 0;
2935 }
2936
2937 static int
2938 iscsi_eh_host_reset(struct scsi_cmnd *sc)
2939 {
2940 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2941 struct iscsi_conn *conn = ctask->conn;
2942 struct iscsi_session *session = conn->session;
2943
2944 spin_lock_bh(&session->lock);
2945 if (session->state == ISCSI_STATE_TERMINATE) {
2946 debug_scsi("failing host reset: session terminated "
2947 "[CID %d age %d]", conn->id, session->age);
2948 spin_unlock_bh(&session->lock);
2949 return FAILED;
2950 }
2951 spin_unlock_bh(&session->lock);
2952
2953 debug_scsi("failing connection CID %d due to SCSI host reset "
2954 "[itt 0x%x age %d]", conn->id, ctask->itt,
2955 session->age);
2956 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2957
2958 return SUCCESS;
2959 }
2960
2961 static void
2962 iscsi_tmabort_timedout(unsigned long data)
2963 {
2964 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
2965 struct iscsi_conn *conn = ctask->conn;
2966 struct iscsi_session *session = conn->session;
2967
2968 spin_lock(&session->lock);
2969 if (conn->tmabort_state == TMABORT_INITIAL) {
2970 __kfifo_put(session->mgmtpool.queue,
2971 (void*)&ctask->mtask, sizeof(void*));
2972 conn->tmabort_state = TMABORT_TIMEDOUT;
2973 debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
2974 (long)ctask->sc, ctask->itt);
2975 /* unblock eh_abort() */
2976 wake_up(&conn->ehwait);
2977 }
2978 spin_unlock(&session->lock);
2979 }
2980
2981 static int
2982 iscsi_eh_abort(struct scsi_cmnd *sc)
2983 {
2984 int rc;
2985 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2986 struct iscsi_conn *conn = ctask->conn;
2987 struct iscsi_session *session = conn->session;
2988
2989 conn->eh_abort_cnt++;
2990 debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
2991
2992 /*
2993 * two cases for ERL=0 here:
2994 *
2995 * 1) connection-level failure;
2996 * 2) recovery due protocol error;
2997 */
2998 down(&conn->xmitsema);
2999 spin_lock_bh(&session->lock);
3000 if (session->state != ISCSI_STATE_LOGGED_IN) {
3001 if (session->state == ISCSI_STATE_TERMINATE) {
3002 spin_unlock_bh(&session->lock);
3003 up(&conn->xmitsema);
3004 goto failed;
3005 }
3006 spin_unlock_bh(&session->lock);
3007 } else {
3008 struct iscsi_tm *hdr = &conn->tmhdr;
3009
3010 /*
3011 * Still LOGGED_IN...
3012 */
3013
3014 if (!ctask->sc || sc->SCp.phase != session->age) {
3015 /*
3016 * 1) ctask completed before time out. But session
3017 * is still ok => Happy Retry.
3018 * 2) session was re-open during time out of ctask.
3019 */
3020 spin_unlock_bh(&session->lock);
3021 up(&conn->xmitsema);
3022 goto success;
3023 }
3024 conn->tmabort_state = TMABORT_INITIAL;
3025 spin_unlock_bh(&session->lock);
3026
3027 /*
3028 * ctask timed out but session is OK
3029 * ERL=0 requires task mgmt abort to be issued on each
3030 * failed command. requests must be serialized.
3031 */
3032 memset(hdr, 0, sizeof(struct iscsi_tm));
3033 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
3034 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
3035 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3036 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
3037 hdr->rtt = ctask->hdr.itt;
3038 hdr->refcmdsn = ctask->hdr.cmdsn;
3039
3040 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
3041 NULL, 0);
3042 if (rc) {
3043 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3044 debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
3045 } else {
3046 struct iscsi_r2t_info *r2t;
3047
3048 /*
3049 * TMF abort vs. TMF response race logic
3050 */
3051 spin_lock_bh(&session->lock);
3052 ctask->mtask = (struct iscsi_mgmt_task *)
3053 session->mgmt_cmds[(hdr->itt & ITT_MASK) -
3054 ISCSI_MGMT_ITT_OFFSET];
3055 /*
3056 * have to flush r2tqueue to avoid r2t leaks
3057 */
3058 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
3059 sizeof(void*))) {
3060 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
3061 sizeof(void*));
3062 }
3063 if (conn->tmabort_state == TMABORT_INITIAL) {
3064 conn->tmfcmd_pdus_cnt++;
3065 conn->tmabort_timer.expires = 3*HZ + jiffies;
3066 conn->tmabort_timer.function =
3067 iscsi_tmabort_timedout;
3068 conn->tmabort_timer.data = (unsigned long)ctask;
3069 add_timer(&conn->tmabort_timer);
3070 debug_scsi("abort sent [itt 0x%x]", ctask->itt);
3071 } else {
3072 if (!ctask->sc ||
3073 conn->tmabort_state == TMABORT_SUCCESS) {
3074 conn->tmabort_state = TMABORT_INITIAL;
3075 spin_unlock_bh(&session->lock);
3076 up(&conn->xmitsema);
3077 goto success;
3078 }
3079 conn->tmabort_state = TMABORT_INITIAL;
3080 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3081 }
3082 spin_unlock_bh(&session->lock);
3083 }
3084 }
3085 up(&conn->xmitsema);
3086
3087
3088 /*
3089 * block eh thread until:
3090 *
3091 * 1) abort response;
3092 * 2) abort timeout;
3093 * 3) session re-opened;
3094 * 4) session terminated;
3095 */
3096 for (;;) {
3097 int p_state = session->state;
3098
3099 rc = wait_event_interruptible(conn->ehwait,
3100 (p_state == ISCSI_STATE_LOGGED_IN ?
3101 (session->state == ISCSI_STATE_TERMINATE ||
3102 conn->tmabort_state != TMABORT_INITIAL) :
3103 (session->state == ISCSI_STATE_TERMINATE ||
3104 session->state == ISCSI_STATE_LOGGED_IN)));
3105 if (rc) {
3106 /* shutdown.. */
3107 session->state = ISCSI_STATE_TERMINATE;
3108 goto failed;
3109 }
3110
3111 if (signal_pending(current))
3112 flush_signals(current);
3113
3114 if (session->state == ISCSI_STATE_TERMINATE)
3115 goto failed;
3116
3117 spin_lock_bh(&session->lock);
3118 if (sc->SCp.phase == session->age &&
3119 (conn->tmabort_state == TMABORT_TIMEDOUT ||
3120 conn->tmabort_state == TMABORT_FAILED)) {
3121 conn->tmabort_state = TMABORT_INITIAL;
3122 if (!ctask->sc) {
3123 /*
3124 * ctask completed before tmf abort response or
3125 * time out.
3126 * But session is still ok => Happy Retry.
3127 */
3128 spin_unlock_bh(&session->lock);
3129 break;
3130 }
3131 spin_unlock_bh(&session->lock);
3132 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3133 continue;
3134 }
3135 spin_unlock_bh(&session->lock);
3136 break;
3137 }
3138
3139 success:
3140 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3141 rc = SUCCESS;
3142 goto exit;
3143
3144 failed:
3145 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3146 rc = FAILED;
3147
3148 exit:
3149 del_timer_sync(&conn->tmabort_timer);
3150
3151 down(&conn->xmitsema);
3152 if (conn->sock) {
3153 struct sock *sk = conn->sock->sk;
3154
3155 write_lock_bh(&sk->sk_callback_lock);
3156 iscsi_ctask_cleanup(conn, ctask);
3157 write_unlock_bh(&sk->sk_callback_lock);
3158 }
3159 up(&conn->xmitsema);
3160 return rc;
3161 }
3162
3163 static int
3164 iscsi_r2tpool_alloc(struct iscsi_session *session)
3165 {
3166 int i;
3167 int cmd_i;
3168
3169 /*
3170 * initialize per-task: R2T pool and xmit queue
3171 */
3172 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3173 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3174
3175 /*
3176 * pre-allocated x4 as much r2ts to handle race when
3177 * target acks DataOut faster than we data_xmit() queues
3178 * could replenish r2tqueue.
3179 */
3180
3181 /* R2T pool */
3182 if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
3183 (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
3184 goto r2t_alloc_fail;
3185 }
3186
3187 /* R2T xmit queue */
3188 ctask->r2tqueue = kfifo_alloc(
3189 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
3190 if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
3191 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3192 goto r2t_alloc_fail;
3193 }
3194
3195 /*
3196 * number of
3197 * Data-Out PDU's within R2T-sequence can be quite big;
3198 * using mempool
3199 */
3200 ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
3201 mempool_alloc_slab, mempool_free_slab, taskcache);
3202 if (ctask->datapool == NULL) {
3203 kfifo_free(ctask->r2tqueue);
3204 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3205 goto r2t_alloc_fail;
3206 }
3207 INIT_LIST_HEAD(&ctask->dataqueue);
3208 }
3209
3210 return 0;
3211
3212 r2t_alloc_fail:
3213 for (i = 0; i < cmd_i; i++) {
3214 mempool_destroy(session->cmds[i]->datapool);
3215 kfifo_free(session->cmds[i]->r2tqueue);
3216 iscsi_pool_free(&session->cmds[i]->r2tpool,
3217 (void**)session->cmds[i]->r2ts);
3218 }
3219 return -ENOMEM;
3220 }
3221
3222 static void
3223 iscsi_r2tpool_free(struct iscsi_session *session)
3224 {
3225 int i;
3226
3227 for (i = 0; i < session->cmds_max; i++) {
3228 mempool_destroy(session->cmds[i]->datapool);
3229 kfifo_free(session->cmds[i]->r2tqueue);
3230 iscsi_pool_free(&session->cmds[i]->r2tpool,
3231 (void**)session->cmds[i]->r2ts);
3232 }
3233 }
3234
3235 static struct scsi_host_template iscsi_sht = {
3236 .name = "iSCSI Initiator over TCP/IP, v."
3237 ISCSI_VERSION_STR,
3238 .queuecommand = iscsi_queuecommand,
3239 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
3240 .sg_tablesize = ISCSI_SG_TABLESIZE,
3241 .cmd_per_lun = ISCSI_CMD_PER_LUN,
3242 .eh_abort_handler = iscsi_eh_abort,
3243 .eh_host_reset_handler = iscsi_eh_host_reset,
3244 .use_clustering = DISABLE_CLUSTERING,
3245 .proc_name = "iscsi_tcp",
3246 .this_id = -1,
3247 };
3248
3249 static iscsi_sessionh_t
3250 iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
3251 {
3252 int cmd_i;
3253 struct iscsi_session *session;
3254
3255 session = iscsi_hostdata(host->hostdata);
3256 memset(session, 0, sizeof(struct iscsi_session));
3257
3258 session->host = host;
3259 session->id = host->host_no;
3260 session->state = ISCSI_STATE_LOGGED_IN;
3261 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
3262 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
3263 session->cmdsn = initial_cmdsn;
3264 session->exp_cmdsn = initial_cmdsn + 1;
3265 session->max_cmdsn = initial_cmdsn + 1;
3266 session->max_r2t = 1;
3267
3268 /* initialize SCSI PDU commands pool */
3269 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
3270 (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
3271 goto cmdpool_alloc_fail;
3272
3273 /* pre-format cmds pool with ITT */
3274 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
3275 session->cmds[cmd_i]->itt = cmd_i;
3276
3277 spin_lock_init(&session->lock);
3278 INIT_LIST_HEAD(&session->connections);
3279
3280 /* initialize immediate command pool */
3281 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
3282 (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
3283 goto mgmtpool_alloc_fail;
3284
3285
3286 /* pre-format immediate cmds pool with ITT */
3287 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
3288 session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
3289 session->mgmt_cmds[cmd_i]->data = kmalloc(
3290 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
3291 if (!session->mgmt_cmds[cmd_i]->data) {
3292 int j;
3293
3294 for (j = 0; j < cmd_i; j++)
3295 kfree(session->mgmt_cmds[j]->data);
3296 goto immdata_alloc_fail;
3297 }
3298 }
3299
3300 if (iscsi_r2tpool_alloc(session))
3301 goto r2tpool_alloc_fail;
3302
3303 return iscsi_handle(session);
3304
3305 r2tpool_alloc_fail:
3306 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3307 kfree(session->mgmt_cmds[cmd_i]->data);
3308 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3309 immdata_alloc_fail:
3310 mgmtpool_alloc_fail:
3311 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3312 cmdpool_alloc_fail:
3313 return iscsi_handle(NULL);
3314 }
3315
3316 static void
3317 iscsi_session_destroy(iscsi_sessionh_t sessionh)
3318 {
3319 int cmd_i;
3320 struct iscsi_data_task *dtask, *n;
3321 struct iscsi_session *session = iscsi_ptr(sessionh);
3322
3323 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3324 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3325 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
3326 list_del(&dtask->item);
3327 mempool_free(dtask, ctask->datapool);
3328 }
3329 }
3330
3331 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3332 kfree(session->mgmt_cmds[cmd_i]->data);
3333
3334 iscsi_r2tpool_free(session);
3335 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3336 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3337 }
3338
3339 static int
3340 iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
3341 uint32_t value)
3342 {
3343 struct iscsi_conn *conn = iscsi_ptr(connh);
3344 struct iscsi_session *session = conn->session;
3345
3346 spin_lock_bh(&session->lock);
3347 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
3348 conn->stop_stage != STOP_CONN_RECOVER) {
3349 printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
3350 param);
3351 spin_unlock_bh(&session->lock);
3352 return 0;
3353 }
3354 spin_unlock_bh(&session->lock);
3355
3356 switch(param) {
3357 case ISCSI_PARAM_MAX_RECV_DLENGTH: {
3358 char *saveptr = conn->data;
3359 int flags = GFP_KERNEL;
3360
3361 if (conn->data_size >= value) {
3362 conn->max_recv_dlength = value;
3363 break;
3364 }
3365
3366 spin_lock_bh(&session->lock);
3367 if (conn->stop_stage == STOP_CONN_RECOVER)
3368 flags = GFP_ATOMIC;
3369 spin_unlock_bh(&session->lock);
3370
3371 if (value <= PAGE_SIZE)
3372 conn->data = kmalloc(value, flags);
3373 else
3374 conn->data = (void*)__get_free_pages(flags,
3375 get_order(value));
3376 if (conn->data == NULL) {
3377 conn->data = saveptr;
3378 return -ENOMEM;
3379 }
3380 if (conn->data_size <= PAGE_SIZE)
3381 kfree(saveptr);
3382 else
3383 free_pages((unsigned long)saveptr,
3384 get_order(conn->data_size));
3385 conn->max_recv_dlength = value;
3386 conn->data_size = value;
3387 }
3388 break;
3389 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3390 conn->max_xmit_dlength = value;
3391 break;
3392 case ISCSI_PARAM_HDRDGST_EN:
3393 conn->hdrdgst_en = value;
3394 conn->hdr_size = sizeof(struct iscsi_hdr);
3395 if (conn->hdrdgst_en) {
3396 conn->hdr_size += sizeof(__u32);
3397 if (!conn->tx_tfm)
3398 conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
3399 if (!conn->tx_tfm)
3400 return -ENOMEM;
3401 if (!conn->rx_tfm)
3402 conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
3403 if (!conn->rx_tfm) {
3404 crypto_free_tfm(conn->tx_tfm);
3405 return -ENOMEM;
3406 }
3407 } else {
3408 if (conn->tx_tfm)
3409 crypto_free_tfm(conn->tx_tfm);
3410 if (conn->rx_tfm)
3411 crypto_free_tfm(conn->rx_tfm);
3412 }
3413 break;
3414 case ISCSI_PARAM_DATADGST_EN:
3415 conn->datadgst_en = value;
3416 if (conn->datadgst_en) {
3417 if (!conn->data_tx_tfm)
3418 conn->data_tx_tfm =
3419 crypto_alloc_tfm("crc32c", 0);
3420 if (!conn->data_tx_tfm)
3421 return -ENOMEM;
3422 if (!conn->data_rx_tfm)
3423 conn->data_rx_tfm =
3424 crypto_alloc_tfm("crc32c", 0);
3425 if (!conn->data_rx_tfm) {
3426 crypto_free_tfm(conn->data_tx_tfm);
3427 return -ENOMEM;
3428 }
3429 } else {
3430 if (conn->data_tx_tfm)
3431 crypto_free_tfm(conn->data_tx_tfm);
3432 if (conn->data_rx_tfm)
3433 crypto_free_tfm(conn->data_rx_tfm);
3434 }
3435 break;
3436 case ISCSI_PARAM_INITIAL_R2T_EN:
3437 session->initial_r2t_en = value;
3438 break;
3439 case ISCSI_PARAM_MAX_R2T:
3440 if (session->max_r2t == roundup_pow_of_two(value))
3441 break;
3442 iscsi_r2tpool_free(session);
3443 session->max_r2t = value;
3444 if (session->max_r2t & (session->max_r2t - 1))
3445 session->max_r2t = roundup_pow_of_two(session->max_r2t);
3446 if (iscsi_r2tpool_alloc(session))
3447 return -ENOMEM;
3448 break;
3449 case ISCSI_PARAM_IMM_DATA_EN:
3450 session->imm_data_en = value;
3451 break;
3452 case ISCSI_PARAM_FIRST_BURST:
3453 session->first_burst = value;
3454 break;
3455 case ISCSI_PARAM_MAX_BURST:
3456 session->max_burst = value;
3457 break;
3458 case ISCSI_PARAM_PDU_INORDER_EN:
3459 session->pdu_inorder_en = value;
3460 break;
3461 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3462 session->dataseq_inorder_en = value;
3463 break;
3464 case ISCSI_PARAM_ERL:
3465 session->erl = value;
3466 break;
3467 case ISCSI_PARAM_IFMARKER_EN:
3468 BUG_ON(value);
3469 session->ifmarker_en = value;
3470 break;
3471 case ISCSI_PARAM_OFMARKER_EN:
3472 BUG_ON(value);
3473 session->ofmarker_en = value;
3474 break;
3475 default:
3476 break;
3477 }
3478
3479 return 0;
3480 }
3481
3482 static int
3483 iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
3484 uint32_t *value)
3485 {
3486 struct iscsi_conn *conn = iscsi_ptr(connh);
3487 struct iscsi_session *session = conn->session;
3488
3489 switch(param) {
3490 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3491 *value = conn->max_recv_dlength;
3492 break;
3493 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3494 *value = conn->max_xmit_dlength;
3495 break;
3496 case ISCSI_PARAM_HDRDGST_EN:
3497 *value = conn->hdrdgst_en;
3498 break;
3499 case ISCSI_PARAM_DATADGST_EN:
3500 *value = conn->datadgst_en;
3501 break;
3502 case ISCSI_PARAM_INITIAL_R2T_EN:
3503 *value = session->initial_r2t_en;
3504 break;
3505 case ISCSI_PARAM_MAX_R2T:
3506 *value = session->max_r2t;
3507 break;
3508 case ISCSI_PARAM_IMM_DATA_EN:
3509 *value = session->imm_data_en;
3510 break;
3511 case ISCSI_PARAM_FIRST_BURST:
3512 *value = session->first_burst;
3513 break;
3514 case ISCSI_PARAM_MAX_BURST:
3515 *value = session->max_burst;
3516 break;
3517 case ISCSI_PARAM_PDU_INORDER_EN:
3518 *value = session->pdu_inorder_en;
3519 break;
3520 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3521 *value = session->dataseq_inorder_en;
3522 break;
3523 case ISCSI_PARAM_ERL:
3524 *value = session->erl;
3525 break;
3526 case ISCSI_PARAM_IFMARKER_EN:
3527 *value = session->ifmarker_en;
3528 break;
3529 case ISCSI_PARAM_OFMARKER_EN:
3530 *value = session->ofmarker_en;
3531 break;
3532 default:
3533 return ISCSI_ERR_PARAM_NOT_FOUND;
3534 }
3535
3536 return 0;
3537 }
3538
3539 static void
3540 iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
3541 {
3542 struct iscsi_conn *conn = iscsi_ptr(connh);
3543
3544 stats->txdata_octets = conn->txdata_octets;
3545 stats->rxdata_octets = conn->rxdata_octets;
3546 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
3547 stats->dataout_pdus = conn->dataout_pdus_cnt;
3548 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
3549 stats->datain_pdus = conn->datain_pdus_cnt;
3550 stats->r2t_pdus = conn->r2t_pdus_cnt;
3551 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
3552 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
3553 stats->custom_length = 3;
3554 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
3555 stats->custom[0].value = conn->sendpage_failures_cnt;
3556 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
3557 stats->custom[1].value = conn->discontiguous_hdr_cnt;
3558 strcpy(stats->custom[2].desc, "eh_abort_cnt");
3559 stats->custom[2].value = conn->eh_abort_cnt;
3560 }
3561
3562 static int
3563 iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
3564 uint32_t data_size)
3565 {
3566 struct iscsi_conn *conn = iscsi_ptr(connh);
3567 int rc;
3568
3569 down(&conn->xmitsema);
3570 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
3571 up(&conn->xmitsema);
3572
3573 return rc;
3574 }
3575
3576 static struct iscsi_transport iscsi_tcp_transport = {
3577 .owner = THIS_MODULE,
3578 .name = "tcp",
3579 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
3580 | CAP_DATADGST,
3581 .host_template = &iscsi_sht,
3582 .hostdata_size = sizeof(struct iscsi_session),
3583 .max_conn = 1,
3584 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
3585 .create_session = iscsi_session_create,
3586 .destroy_session = iscsi_session_destroy,
3587 .create_conn = iscsi_conn_create,
3588 .bind_conn = iscsi_conn_bind,
3589 .destroy_conn = iscsi_conn_destroy,
3590 .set_param = iscsi_conn_set_param,
3591 .get_param = iscsi_conn_get_param,
3592 .start_conn = iscsi_conn_start,
3593 .stop_conn = iscsi_conn_stop,
3594 .send_pdu = iscsi_conn_send_pdu,
3595 .get_stats = iscsi_conn_get_stats,
3596 };
3597
3598 static int __init
3599 iscsi_tcp_init(void)
3600 {
3601 int error;
3602
3603 if (iscsi_max_lun < 1) {
3604 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
3605 return -EINVAL;
3606 }
3607 iscsi_tcp_transport.max_lun = iscsi_max_lun;
3608
3609 taskcache = kmem_cache_create("iscsi_taskcache",
3610 sizeof(struct iscsi_data_task), 0,
3611 SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
3612 if (!taskcache)
3613 return -ENOMEM;
3614
3615 error = iscsi_register_transport(&iscsi_tcp_transport);
3616 if (error)
3617 kmem_cache_destroy(taskcache);
3618
3619 return error;
3620 }
3621
3622 static void __exit
3623 iscsi_tcp_exit(void)
3624 {
3625 iscsi_unregister_transport(&iscsi_tcp_transport);
3626 kmem_cache_destroy(taskcache);
3627 }
3628
3629 module_init(iscsi_tcp_init);
3630 module_exit(iscsi_tcp_exit);
USB Experimental Work