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[net-next-2.6.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 1/*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24#include <linux/types.h>
25#include <linux/mutex.h>
26#include <linux/kfifo.h>
27#include <linux/delay.h>
28#include <net/tcp.h>
29#include <scsi/scsi_cmnd.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_eh.h>
32#include <scsi/scsi_tcq.h>
33#include <scsi/scsi_host.h>
34#include <scsi/scsi.h>
35#include <scsi/iscsi_proto.h>
36#include <scsi/scsi_transport.h>
37#include <scsi/scsi_transport_iscsi.h>
38#include <scsi/libiscsi.h>
39
40struct iscsi_session *
41class_to_transport_session(struct iscsi_cls_session *cls_session)
42{
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
45}
46EXPORT_SYMBOL_GPL(class_to_transport_session);
47
48#define INVALID_SN_DELTA 0xffff
49
50int
51iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
52{
53 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
54 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
55
56 if (max_cmdsn < exp_cmdsn -1 &&
57 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
58 return ISCSI_ERR_MAX_CMDSN;
59 if (max_cmdsn > session->max_cmdsn ||
60 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
61 session->max_cmdsn = max_cmdsn;
62 if (exp_cmdsn > session->exp_cmdsn ||
63 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
64 session->exp_cmdsn = exp_cmdsn;
65
66 return 0;
67}
68EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
69
70void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
71 struct iscsi_data *hdr,
72 int transport_data_cnt)
73{
74 struct iscsi_conn *conn = ctask->conn;
75
76 memset(hdr, 0, sizeof(struct iscsi_data));
77 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
78 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
79 ctask->unsol_datasn++;
80 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
81 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
82
83 hdr->itt = ctask->hdr->itt;
84 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
85
86 hdr->offset = cpu_to_be32(ctask->total_length -
87 transport_data_cnt -
88 ctask->unsol_count);
89
90 if (ctask->unsol_count > conn->max_xmit_dlength) {
91 hton24(hdr->dlength, conn->max_xmit_dlength);
92 ctask->data_count = conn->max_xmit_dlength;
93 hdr->flags = 0;
94 } else {
95 hton24(hdr->dlength, ctask->unsol_count);
96 ctask->data_count = ctask->unsol_count;
97 hdr->flags = ISCSI_FLAG_CMD_FINAL;
98 }
99}
100EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
101
102/**
103 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
104 * @ctask: iscsi cmd task
105 *
106 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
107 * fields like dlength or final based on how much data it sends
108 */
109static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
110{
111 struct iscsi_conn *conn = ctask->conn;
112 struct iscsi_session *session = conn->session;
113 struct iscsi_cmd *hdr = ctask->hdr;
114 struct scsi_cmnd *sc = ctask->sc;
115
116 hdr->opcode = ISCSI_OP_SCSI_CMD;
117 hdr->flags = ISCSI_ATTR_SIMPLE;
118 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
119 hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
120 (session->age << ISCSI_AGE_SHIFT);
121 hdr->data_length = cpu_to_be32(sc->request_bufflen);
122 hdr->cmdsn = cpu_to_be32(session->cmdsn);
123 session->cmdsn++;
124 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
125 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
126 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
127
128 if (sc->sc_data_direction == DMA_TO_DEVICE) {
129 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
130 /*
131 * Write counters:
132 *
133 * imm_count bytes to be sent right after
134 * SCSI PDU Header
135 *
136 * unsol_count bytes(as Data-Out) to be sent
137 * without R2T ack right after
138 * immediate data
139 *
140 * r2t_data_count bytes to be sent via R2T ack's
141 *
142 * pad_count bytes to be sent as zero-padding
143 */
144 ctask->imm_count = 0;
145 ctask->unsol_count = 0;
146 ctask->unsol_datasn = 0;
147
148 if (session->imm_data_en) {
149 if (ctask->total_length >= session->first_burst)
150 ctask->imm_count = min(session->first_burst,
151 conn->max_xmit_dlength);
152 else
153 ctask->imm_count = min(ctask->total_length,
154 conn->max_xmit_dlength);
155 hton24(ctask->hdr->dlength, ctask->imm_count);
156 } else
157 zero_data(ctask->hdr->dlength);
158
159 if (!session->initial_r2t_en)
160 ctask->unsol_count = min(session->first_burst,
161 ctask->total_length) - ctask->imm_count;
162 if (!ctask->unsol_count)
163 /* No unsolicit Data-Out's */
164 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
165 } else {
166 ctask->datasn = 0;
167 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
168 zero_data(hdr->dlength);
169
170 if (sc->sc_data_direction == DMA_FROM_DEVICE)
171 hdr->flags |= ISCSI_FLAG_CMD_READ;
172 }
173
174 conn->scsicmd_pdus_cnt++;
175}
176EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
177
178/**
179 * iscsi_complete_command - return command back to scsi-ml
180 * @session: iscsi session
181 * @ctask: iscsi cmd task
182 *
183 * Must be called with session lock.
184 * This function returns the scsi command to scsi-ml and returns
185 * the cmd task to the pool of available cmd tasks.
186 */
187static void iscsi_complete_command(struct iscsi_session *session,
188 struct iscsi_cmd_task *ctask)
189{
190 struct scsi_cmnd *sc = ctask->sc;
191
192 ctask->sc = NULL;
193 list_del_init(&ctask->running);
194 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
195 sc->scsi_done(sc);
196}
197
198/**
199 * iscsi_cmd_rsp - SCSI Command Response processing
200 * @conn: iscsi connection
201 * @hdr: iscsi header
202 * @ctask: scsi command task
203 * @data: cmd data buffer
204 * @datalen: len of buffer
205 *
206 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
207 * then completes the command and task.
208 **/
209static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
210 struct iscsi_cmd_task *ctask, char *data,
211 int datalen)
212{
213 int rc;
214 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
215 struct iscsi_session *session = conn->session;
216 struct scsi_cmnd *sc = ctask->sc;
217
218 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
219 if (rc) {
220 sc->result = DID_ERROR << 16;
221 goto out;
222 }
223
224 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
225
226 sc->result = (DID_OK << 16) | rhdr->cmd_status;
227
228 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
229 sc->result = DID_ERROR << 16;
230 goto out;
231 }
232
233 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
234 int senselen;
235
236 if (datalen < 2) {
237invalid_datalen:
be2df72e
OG		 238 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
239 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 240 sc->result = DID_BAD_TARGET << 16;
241 goto out;
242 }
243
244 senselen = (data[0] << 8) | data[1];
245 if (datalen < senselen)
246 goto invalid_datalen;
247
248 memcpy(sc->sense_buffer, data + 2,
249 min(senselen, SCSI_SENSE_BUFFERSIZE));
250 debug_scsi("copied %d bytes of sense\n",
251 min(senselen, SCSI_SENSE_BUFFERSIZE));
252 }
253
254 if (sc->sc_data_direction == DMA_TO_DEVICE)
255 goto out;
256
257 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
258 int res_count = be32_to_cpu(rhdr->residual_count);
259
260 if (res_count > 0 && res_count <= sc->request_bufflen)
261 sc->resid = res_count;
262 else
263 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
264 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
265 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
266 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
267 sc->resid = be32_to_cpu(rhdr->residual_count);
268
269out:
270 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
271 (long)sc, sc->result, ctask->itt);
272 conn->scsirsp_pdus_cnt++;
273
274 iscsi_complete_command(conn->session, ctask);
275 return rc;
276}
277
278/**
279 * __iscsi_complete_pdu - complete pdu
280 * @conn: iscsi conn
281 * @hdr: iscsi header
282 * @data: data buffer
283 * @datalen: len of data buffer
284 *
285 * Completes pdu processing by freeing any resources allocated at
286 * queuecommand or send generic. session lock must be held and verify
287 * itt must have been called.
288 */
289int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
290 char *data, int datalen)
291{
292 struct iscsi_session *session = conn->session;
293 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
294 struct iscsi_cmd_task *ctask;
295 struct iscsi_mgmt_task *mtask;
296 uint32_t itt;
297
298 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG))
299 itt = hdr->itt & ISCSI_ITT_MASK;
300 else
301 itt = hdr->itt;
302
303 if (itt < session->cmds_max) {
304 ctask = session->cmds[itt];
305
306 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
307 opcode, conn->id, ctask->itt, datalen);
308
309 switch(opcode) {
310 case ISCSI_OP_SCSI_CMD_RSP:
311 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
312 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
313 datalen);
314 break;
315 case ISCSI_OP_SCSI_DATA_IN:
316 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
317 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
318 conn->scsirsp_pdus_cnt++;
319 iscsi_complete_command(session, ctask);
320 }
321 break;
322 case ISCSI_OP_R2T:
323 /* LLD handles this for now */
324 break;
325 default:
326 rc = ISCSI_ERR_BAD_OPCODE;
327 break;
328 }
329 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
330 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
331 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
332
333 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
334 opcode, conn->id, mtask->itt, datalen);
335
8d2860b3
MC		 336 rc = iscsi_check_assign_cmdsn(session,
337 (struct iscsi_nopin*)hdr);
338 if (rc)
339 goto done;
340
7996a778 341 switch(opcode) {
8d2860b3
MC		 342 case ISCSI_OP_LOGOUT_RSP:
343 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
344 /* fall through */
7996a778
MC		 345 case ISCSI_OP_LOGIN_RSP:
346 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 347 /*
348 * login related PDU's exp_statsn is handled in
349 * userspace
350 */
7996a778
MC		 351 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
352 list_del(&mtask->running);
353 if (conn->login_mtask != mtask)
354 __kfifo_put(session->mgmtpool.queue,
355 (void*)&mtask, sizeof(void*));
356 break;
357 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 358 if (datalen) {
359 rc = ISCSI_ERR_PROTO;
360 break;
361 }
8d2860b3
MC		 362
363 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
7996a778
MC		 364 conn->tmfrsp_pdus_cnt++;
365 if (conn->tmabort_state == TMABORT_INITIAL) {
366 conn->tmabort_state =
367 ((struct iscsi_tm_rsp *)hdr)->
368 response == ISCSI_TMF_RSP_COMPLETE ?
369 TMABORT_SUCCESS:TMABORT_FAILED;
370 /* unblock eh_abort() */
371 wake_up(&conn->ehwait);
372 }
373 break;
374 case ISCSI_OP_NOOP_IN:
375 if (hdr->ttt != ISCSI_RESERVED_TAG) {
376 rc = ISCSI_ERR_PROTO;
377 break;
378 }
7996a778
MC		 379 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
380
381 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
382 list_del(&mtask->running);
383 if (conn->login_mtask != mtask)
384 __kfifo_put(session->mgmtpool.queue,
385 (void*)&mtask, sizeof(void*));
386 break;
387 default:
388 rc = ISCSI_ERR_BAD_OPCODE;
389 break;
390 }
391 } else if (itt == ISCSI_RESERVED_TAG) {
392 switch(opcode) {
393 case ISCSI_OP_NOOP_IN:
394 if (!datalen) {
395 rc = iscsi_check_assign_cmdsn(session,
396 (struct iscsi_nopin*)hdr);
397 if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
398 rc = iscsi_recv_pdu(conn->cls_conn,
399 hdr, NULL, 0);
400 } else
401 rc = ISCSI_ERR_PROTO;
402 break;
403 case ISCSI_OP_REJECT:
404 /* we need sth like iscsi_reject_rsp()*/
405 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 406 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
7996a778
MC		 407 /* we need sth like iscsi_async_event_rsp() */
408 rc = ISCSI_ERR_BAD_OPCODE;
409 break;
410 default:
411 rc = ISCSI_ERR_BAD_OPCODE;
412 break;
413 }
414 } else
415 rc = ISCSI_ERR_BAD_ITT;
416
8d2860b3 417done:
7996a778
MC		 418 return rc;
419}
420EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
421
422int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
423 char *data, int datalen)
424{
425 int rc;
426
427 spin_lock(&conn->session->lock);
428 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
429 spin_unlock(&conn->session->lock);
430 return rc;
431}
432EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
433
434/* verify itt (itt encoding: age+cid+itt) */
435int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
436 uint32_t *ret_itt)
437{
438 struct iscsi_session *session = conn->session;
439 struct iscsi_cmd_task *ctask;
440 uint32_t itt;
441
442 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
443 if ((hdr->itt & ISCSI_AGE_MASK) !=
444 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 445 printk(KERN_ERR "iscsi: received itt %x expected "
7996a778
MC		 446 "session age (%x)\n", hdr->itt,
447 session->age & ISCSI_AGE_MASK);
448 return ISCSI_ERR_BAD_ITT;
449 }
450
451 if ((hdr->itt & ISCSI_CID_MASK) !=
452 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 453 printk(KERN_ERR "iscsi: received itt %x, expected "
7996a778
MC		 454 "CID (%x)\n", hdr->itt, conn->id);
455 return ISCSI_ERR_BAD_ITT;
456 }
457 itt = hdr->itt & ISCSI_ITT_MASK;
458 } else
459 itt = hdr->itt;
460
461 if (itt < session->cmds_max) {
462 ctask = session->cmds[itt];
463
464 if (!ctask->sc) {
be2df72e 465 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 466 "itt 0x%x\n", ctask->itt);
467 /* force drop */
468 return ISCSI_ERR_NO_SCSI_CMD;
469 }
470
471 if (ctask->sc->SCp.phase != session->age) {
be2df72e 472 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 473 "expected %d\n", ctask->sc->SCp.phase,
474 session->age);
475 return ISCSI_ERR_SESSION_FAILED;
476 }
477 }
478
479 *ret_itt = itt;
480 return 0;
481}
482EXPORT_SYMBOL_GPL(iscsi_verify_itt);
483
484void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
485{
486 struct iscsi_session *session = conn->session;
487 unsigned long flags;
488
489 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 490 if (session->state == ISCSI_STATE_FAILED) {
491 spin_unlock_irqrestore(&session->lock, flags);
492 return;
493 }
494
67a61114 495 if (conn->stop_stage == 0)
7996a778
MC		 496 session->state = ISCSI_STATE_FAILED;
497 spin_unlock_irqrestore(&session->lock, flags);
498 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
499 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
500 iscsi_conn_error(conn->cls_conn, err);
501}
502EXPORT_SYMBOL_GPL(iscsi_conn_failure);
503
504/**
505 * iscsi_data_xmit - xmit any command into the scheduled connection
506 * @conn: iscsi connection
507 *
508 * Notes:
509 * The function can return -EAGAIN in which case the caller must
510 * re-schedule it again later or recover. '0' return code means
511 * successful xmit.
512 **/
513static int iscsi_data_xmit(struct iscsi_conn *conn)
514{
515 struct iscsi_transport *tt;
516
517 if (unlikely(conn->suspend_tx)) {
518 debug_scsi("conn %d Tx suspended!\n", conn->id);
519 return 0;
520 }
521 tt = conn->session->tt;
522
523 /*
524 * Transmit in the following order:
525 *
526 * 1) un-finished xmit (ctask or mtask)
527 * 2) immediate control PDUs
528 * 3) write data
529 * 4) SCSI commands
530 * 5) non-immediate control PDUs
531 *
532 * No need to lock around __kfifo_get as long as
533 * there's one producer and one consumer.
534 */
535
536 BUG_ON(conn->ctask && conn->mtask);
537
538 if (conn->ctask) {
539 if (tt->xmit_cmd_task(conn, conn->ctask))
540 goto again;
541 /* done with this in-progress ctask */
542 conn->ctask = NULL;
543 }
544 if (conn->mtask) {
545 if (tt->xmit_mgmt_task(conn, conn->mtask))
546 goto again;
547 /* done with this in-progress mtask */
548 conn->mtask = NULL;
549 }
550
551 /* process immediate first */
552 if (unlikely(__kfifo_len(conn->immqueue))) {
553 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
554 sizeof(void*))) {
994442e8 555 spin_lock_bh(&conn->session->lock);
7996a778
MC		 556 list_add_tail(&conn->mtask->running,
557 &conn->mgmt_run_list);
994442e8 558 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 559 if (tt->xmit_mgmt_task(conn, conn->mtask))
560 goto again;
561 }
562 /* done with this mtask */
563 conn->mtask = NULL;
564 }
565
566 /* process command queue */
567 while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
568 sizeof(void*))) {
569 /*
570 * iscsi tcp may readd the task to the xmitqueue to send
571 * write data
572 */
994442e8 573 spin_lock_bh(&conn->session->lock);
7996a778
MC		 574 if (list_empty(&conn->ctask->running))
575 list_add_tail(&conn->ctask->running, &conn->run_list);
994442e8 576 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 577 if (tt->xmit_cmd_task(conn, conn->ctask))
578 goto again;
579 }
580 /* done with this ctask */
581 conn->ctask = NULL;
582
583 /* process the rest control plane PDUs, if any */
584 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
585 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
586 sizeof(void*))) {
994442e8 587 spin_lock_bh(&conn->session->lock);
7996a778
MC		 588 list_add_tail(&conn->mtask->running,
589 &conn->mgmt_run_list);
994442e8 590 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 591 if (tt->xmit_mgmt_task(conn, conn->mtask))
592 goto again;
593 }
594 /* done with this mtask */
595 conn->mtask = NULL;
596 }
597
598 return 0;
599
600again:
601 if (unlikely(conn->suspend_tx))
602 return 0;
603
604 return -EAGAIN;
605}
606
607static void iscsi_xmitworker(void *data)
608{
609 struct iscsi_conn *conn = data;
610
611 /*
612 * serialize Xmit worker on a per-connection basis.
613 */
614 mutex_lock(&conn->xmitmutex);
615 if (iscsi_data_xmit(conn))
616 scsi_queue_work(conn->session->host, &conn->xmitwork);
617 mutex_unlock(&conn->xmitmutex);
618}
619
620enum {
621 FAILURE_BAD_HOST = 1,
622 FAILURE_SESSION_FAILED,
623 FAILURE_SESSION_FREED,
624 FAILURE_WINDOW_CLOSED,
625 FAILURE_SESSION_TERMINATE,
656cffc9 626 FAILURE_SESSION_IN_RECOVERY,
7996a778
MC		 627 FAILURE_SESSION_RECOVERY_TIMEOUT,
628};
629
630int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
631{
632 struct Scsi_Host *host;
633 int reason = 0;
634 struct iscsi_session *session;
635 struct iscsi_conn *conn;
636 struct iscsi_cmd_task *ctask = NULL;
637
638 sc->scsi_done = done;
639 sc->result = 0;
640
641 host = sc->device->host;
642 session = iscsi_hostdata(host->hostdata);
643
644 spin_lock(&session->lock);
645
656cffc9
MC		 646 /*
647 * ISCSI_STATE_FAILED is a temp. state. The recovery
648 * code will decide what is best to do with command queued
649 * during this time
650 */
651 if (session->state != ISCSI_STATE_LOGGED_IN &&
652 session->state != ISCSI_STATE_FAILED) {
653 /*
654 * to handle the race between when we set the recovery state
655 * and block the session we requeue here (commands could
656 * be entering our queuecommand while a block is starting
657 * up because the block code is not locked)
658 */
659 if (session->state == ISCSI_STATE_IN_RECOVERY) {
660 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 661 goto reject;
7996a778 662 }
656cffc9
MC		 663
664 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
665 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
666 else if (session->state == ISCSI_STATE_TERMINATE)
667 reason = FAILURE_SESSION_TERMINATE;
668 else
669 reason = FAILURE_SESSION_FREED;
7996a778
MC		 670 goto fault;
671 }
672
673 /*
674 * Check for iSCSI window and take care of CmdSN wrap-around
675 */
676 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
677 reason = FAILURE_WINDOW_CLOSED;
678 goto reject;
679 }
680
681 conn = session->leadconn;
682
683 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
684 sc->SCp.phase = session->age;
685 sc->SCp.ptr = (char *)ctask;
686
687 ctask->mtask = NULL;
688 ctask->conn = conn;
689 ctask->sc = sc;
690 INIT_LIST_HEAD(&ctask->running);
691 ctask->total_length = sc->request_bufflen;
692 iscsi_prep_scsi_cmd_pdu(ctask);
693
694 session->tt->init_cmd_task(ctask);
695
696 __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
697 debug_scsi(
698 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
699 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
700 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
701 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
702 spin_unlock(&session->lock);
703
704 scsi_queue_work(host, &conn->xmitwork);
705 return 0;
706
707reject:
708 spin_unlock(&session->lock);
709 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
710 return SCSI_MLQUEUE_HOST_BUSY;
711
712fault:
713 spin_unlock(&session->lock);
be2df72e 714 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 715 sc->cmnd[0], reason);
716 sc->result = (DID_NO_CONNECT << 16);
717 sc->resid = sc->request_bufflen;
718 sc->scsi_done(sc);
719 return 0;
720}
721EXPORT_SYMBOL_GPL(iscsi_queuecommand);
722
723int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
724{
725 if (depth > ISCSI_MAX_CMD_PER_LUN)
726 depth = ISCSI_MAX_CMD_PER_LUN;
727 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
728 return sdev->queue_depth;
729}
730EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
731
732static int
733iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
734 char *data, uint32_t data_size)
735{
736 struct iscsi_session *session = conn->session;
737 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
738 struct iscsi_mgmt_task *mtask;
739
740 spin_lock_bh(&session->lock);
741 if (session->state == ISCSI_STATE_TERMINATE) {
742 spin_unlock_bh(&session->lock);
743 return -EPERM;
744 }
745 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
746 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
747 /*
748 * Login and Text are sent serially, in
749 * request-followed-by-response sequence.
750 * Same mtask can be used. Same ITT must be used.
751 * Note that login_mtask is preallocated at conn_create().
752 */
753 mtask = conn->login_mtask;
754 else {
656cffc9
MC		 755 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
756 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 757
8d2860b3 758 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 759 if (!__kfifo_get(session->mgmtpool.queue,
760 (void*)&mtask, sizeof(void*))) {
761 spin_unlock_bh(&session->lock);
762 return -ENOSPC;
763 }
764 }
765
766 /*
8d2860b3 767 * pre-format CmdSN for outgoing PDU.
7996a778
MC		 768 */
769 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
770 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
771 (session->age << ISCSI_AGE_SHIFT);
772 nop->cmdsn = cpu_to_be32(session->cmdsn);
773 if (conn->c_stage == ISCSI_CONN_STARTED &&
774 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
775 session->cmdsn++;
776 } else
777 /* do not advance CmdSN */
778 nop->cmdsn = cpu_to_be32(session->cmdsn);
779
7996a778
MC		 780 if (data_size) {
781 memcpy(mtask->data, data, data_size);
782 mtask->data_count = data_size;
783 } else
784 mtask->data_count = 0;
785
786 INIT_LIST_HEAD(&mtask->running);
787 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
788 if (session->tt->init_mgmt_task)
789 session->tt->init_mgmt_task(conn, mtask, data, data_size);
790 spin_unlock_bh(&session->lock);
791
792 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
793 hdr->opcode, hdr->itt, data_size);
794
795 /*
796 * since send_pdu() could be called at least from two contexts,
797 * we need to serialize __kfifo_put, so we don't have to take
798 * additional lock on fast data-path
799 */
800 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
801 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
802 else
803 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
804
805 scsi_queue_work(session->host, &conn->xmitwork);
806 return 0;
807}
808
809int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
810 char *data, uint32_t data_size)
811{
812 struct iscsi_conn *conn = cls_conn->dd_data;
813 int rc;
814
815 mutex_lock(&conn->xmitmutex);
816 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
817 mutex_unlock(&conn->xmitmutex);
818
819 return rc;
820}
821EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
822
823void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
824{
825 struct iscsi_session *session = class_to_transport_session(cls_session);
826 struct iscsi_conn *conn = session->leadconn;
827
828 spin_lock_bh(&session->lock);
829 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 830 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 831 if (conn)
832 wake_up(&conn->ehwait);
833 }
834 spin_unlock_bh(&session->lock);
835}
836EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
837
838int iscsi_eh_host_reset(struct scsi_cmnd *sc)
839{
840 struct Scsi_Host *host = sc->device->host;
841 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
842 struct iscsi_conn *conn = session->leadconn;
843 int fail_session = 0;
844
845 spin_lock_bh(&session->lock);
846 if (session->state == ISCSI_STATE_TERMINATE) {
847failed:
848 debug_scsi("failing host reset: session terminated "
849 "[CID %d age %d]", conn->id, session->age);
850 spin_unlock_bh(&session->lock);
851 return FAILED;
852 }
853
854 if (sc->SCp.phase == session->age) {
855 debug_scsi("failing connection CID %d due to SCSI host reset",
856 conn->id);
857 fail_session = 1;
858 }
859 spin_unlock_bh(&session->lock);
860
861 /*
862 * we drop the lock here but the leadconn cannot be destoyed while
863 * we are in the scsi eh
864 */
656cffc9 865 if (fail_session)
7996a778 866 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 867
868 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
869 wait_event_interruptible(conn->ehwait,
870 session->state == ISCSI_STATE_TERMINATE ||
871 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 872 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 873 if (signal_pending(current))
874 flush_signals(current);
875
876 spin_lock_bh(&session->lock);
877 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 878 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 879 else
880 goto failed;
881 spin_unlock_bh(&session->lock);
882
883 return SUCCESS;
884}
885EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
886
887static void iscsi_tmabort_timedout(unsigned long data)
888{
889 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
890 struct iscsi_conn *conn = ctask->conn;
891 struct iscsi_session *session = conn->session;
892
893 spin_lock(&session->lock);
894 if (conn->tmabort_state == TMABORT_INITIAL) {
895 conn->tmabort_state = TMABORT_TIMEDOUT;
896 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
897 ctask->sc, ctask->itt);
898 /* unblock eh_abort() */
899 wake_up(&conn->ehwait);
900 }
901 spin_unlock(&session->lock);
902}
903
904/* must be called with the mutex lock */
905static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
906 struct iscsi_cmd_task *ctask)
907{
908 struct iscsi_conn *conn = ctask->conn;
909 struct iscsi_session *session = conn->session;
910 struct iscsi_tm *hdr = &conn->tmhdr;
911 int rc;
912
913 /*
914 * ctask timed out but session is OK requests must be serialized.
915 */
916 memset(hdr, 0, sizeof(struct iscsi_tm));
917 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
918 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
919 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
920 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
921 hdr->rtt = ctask->hdr->itt;
922 hdr->refcmdsn = ctask->hdr->cmdsn;
923
924 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
925 NULL, 0);
926 if (rc) {
927 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
928 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
929 return rc;
930 }
931
932 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
933
934 spin_lock_bh(&session->lock);
935 ctask->mtask = (struct iscsi_mgmt_task *)
936 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
937 ISCSI_MGMT_ITT_OFFSET];
938
939 if (conn->tmabort_state == TMABORT_INITIAL) {
940 conn->tmfcmd_pdus_cnt++;
941 conn->tmabort_timer.expires = 10*HZ + jiffies;
942 conn->tmabort_timer.function = iscsi_tmabort_timedout;
943 conn->tmabort_timer.data = (unsigned long)ctask;
944 add_timer(&conn->tmabort_timer);
945 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
946 }
947 spin_unlock_bh(&session->lock);
948 mutex_unlock(&conn->xmitmutex);
949
950 /*
951 * block eh thread until:
952 *
953 * 1) abort response
954 * 2) abort timeout
955 * 3) session is terminated or restarted or userspace has
956 * given up on recovery
957 */
958 wait_event_interruptible(conn->ehwait,
959 sc->SCp.phase != session->age ||
960 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 961 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 962 if (signal_pending(current))
963 flush_signals(current);
964 del_timer_sync(&conn->tmabort_timer);
965
966 mutex_lock(&conn->xmitmutex);
967 return 0;
968}
969
970/*
971 * xmit mutex and session lock must be held
972 */
973#define iscsi_remove_task(tasktype) \
974static struct iscsi_##tasktype * \
975iscsi_remove_##tasktype(struct kfifo *fifo, uint32_t itt) \
976{ \
977 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); \
978 struct iscsi_##tasktype *task; \
979 \
980 debug_scsi("searching %d tasks\n", nr_tasks); \
981 \
982 for (i = 0; i < nr_tasks; i++) { \
983 __kfifo_get(fifo, (void*)&task, sizeof(void*)); \
984 debug_scsi("check task %u\n", task->itt); \
985 \
986 if (task->itt == itt) { \
987 debug_scsi("matched task\n"); \
040515f5 988 return task; \
7996a778
MC		 989 } \
990 \
991 __kfifo_put(fifo, (void*)&task, sizeof(void*)); \
992 } \
993 return NULL; \
994}
995
996iscsi_remove_task(mgmt_task);
997iscsi_remove_task(cmd_task);
998
999static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1000{
1001 struct iscsi_conn *conn = ctask->conn;
1002 struct iscsi_session *session = conn->session;
1003
1004 if (!ctask->mtask)
1005 return -EINVAL;
1006
1007 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1008 list_del(&ctask->mtask->running);
1009 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1010 sizeof(void*));
1011 ctask->mtask = NULL;
1012 return 0;
1013}
1014
1015/*
1016 * session lock and xmitmutex must be held
1017 */
1018static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1019 int err)
1020{
1021 struct scsi_cmnd *sc;
1022
1023 conn->session->tt->cleanup_cmd_task(conn, ctask);
1024 iscsi_ctask_mtask_cleanup(ctask);
1025
1026 sc = ctask->sc;
1027 if (!sc)
1028 return;
1029 sc->result = err;
1030 sc->resid = sc->request_bufflen;
1031 iscsi_complete_command(conn->session, ctask);
1032}
1033
1034int iscsi_eh_abort(struct scsi_cmnd *sc)
1035{
1036 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1037 struct iscsi_conn *conn = ctask->conn;
1038 struct iscsi_session *session = conn->session;
1039 struct iscsi_cmd_task *pending_ctask;
1040 int rc;
1041
1042 conn->eh_abort_cnt++;
1043 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1044
1045 mutex_lock(&conn->xmitmutex);
1046 spin_lock_bh(&session->lock);
1047
1048 /*
1049 * If we are not logged in or we have started a new session
1050 * then let the host reset code handle this
1051 */
1052 if (session->state != ISCSI_STATE_LOGGED_IN ||
1053 sc->SCp.phase != session->age)
1054 goto failed;
1055
1056 /* ctask completed before time out */
1057 if (!ctask->sc)
1058 goto success;
1059
1060 /* what should we do here ? */
1061 if (conn->ctask == ctask) {
be2df72e
OG		 1062 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1063 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1064 goto failed;
1065 }
1066
1067 /* check for the easy pending cmd abort */
1068 pending_ctask = iscsi_remove_cmd_task(conn->xmitqueue, ctask->itt);
1069 if (pending_ctask) {
1070 /* iscsi_tcp queues write transfers on the xmitqueue */
1071 if (list_empty(&pending_ctask->running)) {
1072 debug_scsi("found pending task\n");
1073 goto success;
1074 } else
1075 __kfifo_put(conn->xmitqueue, (void*)&pending_ctask,
1076 sizeof(void*));
1077 }
1078
1079 conn->tmabort_state = TMABORT_INITIAL;
1080
1081 spin_unlock_bh(&session->lock);
1082 rc = iscsi_exec_abort_task(sc, ctask);
1083 spin_lock_bh(&session->lock);
1084
1085 iscsi_ctask_mtask_cleanup(ctask);
1086 if (rc || sc->SCp.phase != session->age ||
1087 session->state != ISCSI_STATE_LOGGED_IN)
1088 goto failed;
1089
1090 /* ctask completed before tmf abort response */
1091 if (!ctask->sc) {
1092 debug_scsi("sc completed while abort in progress\n");
1093 goto success;
1094 }
1095
1096 if (conn->tmabort_state != TMABORT_SUCCESS) {
1097 spin_unlock_bh(&session->lock);
1098 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1099 spin_lock_bh(&session->lock);
1100 goto failed;
1101 }
1102
1103success:
1104 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1105 spin_unlock_bh(&session->lock);
1106
1107 /*
1108 * clean up task if aborted. we have the xmitmutex so grab
1109 * the recv lock as a writer
1110 */
1111 write_lock_bh(conn->recv_lock);
1112 spin_lock(&session->lock);
1113 fail_command(conn, ctask, DID_ABORT << 16);
1114 spin_unlock(&session->lock);
1115 write_unlock_bh(conn->recv_lock);
1116
1117 mutex_unlock(&conn->xmitmutex);
1118 return SUCCESS;
1119
1120failed:
1121 spin_unlock_bh(&session->lock);
1122 mutex_unlock(&conn->xmitmutex);
1123
1124 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1125 return FAILED;
1126}
1127EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1128
1129int
1130iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1131{
1132 int i;
1133
1134 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1135 if (*items == NULL)
1136 return -ENOMEM;
1137
1138 q->max = max;
1139 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1140 if (q->pool == NULL) {
1141 kfree(*items);
1142 return -ENOMEM;
1143 }
1144
1145 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1146 GFP_KERNEL, NULL);
1147 if (q->queue == ERR_PTR(-ENOMEM)) {
1148 kfree(q->pool);
1149 kfree(*items);
1150 return -ENOMEM;
1151 }
1152
1153 for (i = 0; i < max; i++) {
1154 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1155 if (q->pool[i] == NULL) {
1156 int j;
1157
1158 for (j = 0; j < i; j++)
1159 kfree(q->pool[j]);
1160
1161 kfifo_free(q->queue);
1162 kfree(q->pool);
1163 kfree(*items);
1164 return -ENOMEM;
1165 }
1166 memset(q->pool[i], 0, item_size);
1167 (*items)[i] = q->pool[i];
1168 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1169 }
1170 return 0;
1171}
1172EXPORT_SYMBOL_GPL(iscsi_pool_init);
1173
1174void iscsi_pool_free(struct iscsi_queue *q, void **items)
1175{
1176 int i;
1177
1178 for (i = 0; i < q->max; i++)
1179 kfree(items[i]);
1180 kfree(q->pool);
1181 kfree(items);
1182}
1183EXPORT_SYMBOL_GPL(iscsi_pool_free);
1184
1185/*
1186 * iSCSI Session's hostdata organization:
1187 *
1188 * *------------------* <== hostdata_session(host->hostdata)
1189 * | ptr to class sess|
1190 * |------------------| <== iscsi_hostdata(host->hostdata)
1191 * | iscsi_session |
1192 * *------------------*
1193 */
1194
1195#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1196 _sz % sizeof(unsigned long))
1197
1198#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1199
1200/**
1201 * iscsi_session_setup - create iscsi cls session and host and session
1202 * @scsit: scsi transport template
1203 * @iscsit: iscsi transport template
1204 * @initial_cmdsn: initial CmdSN
1205 * @hostno: host no allocated
1206 *
1207 * This can be used by software iscsi_transports that allocate
1208 * a session per scsi host.
1209 **/
1210struct iscsi_cls_session *
1211iscsi_session_setup(struct iscsi_transport *iscsit,
1212 struct scsi_transport_template *scsit,
1213 int cmd_task_size, int mgmt_task_size,
1214 uint32_t initial_cmdsn, uint32_t *hostno)
1215{
1216 struct Scsi_Host *shost;
1217 struct iscsi_session *session;
1218 struct iscsi_cls_session *cls_session;
1219 int cmd_i;
1220
1221 shost = scsi_host_alloc(iscsit->host_template,
1222 hostdata_privsize(sizeof(*session)));
1223 if (!shost)
1224 return NULL;
1225
1226 shost->max_id = 1;
1227 shost->max_channel = 0;
1228 shost->max_lun = iscsit->max_lun;
1229 shost->max_cmd_len = iscsit->max_cmd_len;
1230 shost->transportt = scsit;
1231 shost->transportt->create_work_queue = 1;
1232 *hostno = shost->host_no;
1233
1234 session = iscsi_hostdata(shost->hostdata);
1235 memset(session, 0, sizeof(struct iscsi_session));
1236 session->host = shost;
1237 session->state = ISCSI_STATE_FREE;
1238 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1239 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1240 session->cmdsn = initial_cmdsn;
1241 session->exp_cmdsn = initial_cmdsn + 1;
1242 session->max_cmdsn = initial_cmdsn + 1;
1243 session->max_r2t = 1;
1244 session->tt = iscsit;
1245
1246 /* initialize SCSI PDU commands pool */
1247 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1248 (void***)&session->cmds,
1249 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1250 goto cmdpool_alloc_fail;
1251
1252 /* pre-format cmds pool with ITT */
1253 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1254 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1255
1256 if (cmd_task_size)
1257 ctask->dd_data = &ctask[1];
1258 ctask->itt = cmd_i;
1259 }
1260
1261 spin_lock_init(&session->lock);
1262 INIT_LIST_HEAD(&session->connections);
1263
1264 /* initialize immediate command pool */
1265 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1266 (void***)&session->mgmt_cmds,
1267 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1268 goto mgmtpool_alloc_fail;
1269
1270
1271 /* pre-format immediate cmds pool with ITT */
1272 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1273 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1274
1275 if (mgmt_task_size)
1276 mtask->dd_data = &mtask[1];
1277 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
7996a778
MC		 1278 }
1279
1280 if (scsi_add_host(shost, NULL))
1281 goto add_host_fail;
1282
1283 cls_session = iscsi_create_session(shost, iscsit, 0);
1284 if (!cls_session)
1285 goto cls_session_fail;
1286 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1287
1288 return cls_session;
1289
1290cls_session_fail:
1291 scsi_remove_host(shost);
1292add_host_fail:
7996a778
MC		 1293 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1294mgmtpool_alloc_fail:
1295 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1296cmdpool_alloc_fail:
1297 scsi_host_put(shost);
1298 return NULL;
1299}
1300EXPORT_SYMBOL_GPL(iscsi_session_setup);
1301
1302/**
1303 * iscsi_session_teardown - destroy session, host, and cls_session
1304 * shost: scsi host
1305 *
1306 * This can be used by software iscsi_transports that allocate
1307 * a session per scsi host.
1308 **/
1309void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1310{
1311 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1312 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
7996a778
MC		 1313
1314 scsi_remove_host(shost);
1315
7996a778
MC		 1316 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1317 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1318
1319 iscsi_destroy_session(cls_session);
1320 scsi_host_put(shost);
1321}
1322EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1323
1324/**
1325 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1326 * @cls_session: iscsi_cls_session
1327 * @conn_idx: cid
1328 **/
1329struct iscsi_cls_conn *
1330iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1331{
1332 struct iscsi_session *session = class_to_transport_session(cls_session);
1333 struct iscsi_conn *conn;
1334 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1335 char *data;
7996a778
MC		 1336
1337 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1338 if (!cls_conn)
1339 return NULL;
1340 conn = cls_conn->dd_data;
1341 memset(conn, 0, sizeof(*conn));
1342
1343 conn->session = session;
1344 conn->cls_conn = cls_conn;
1345 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1346 conn->id = conn_idx;
1347 conn->exp_statsn = 0;
1348 conn->tmabort_state = TMABORT_INITIAL;
1349 INIT_LIST_HEAD(&conn->run_list);
1350 INIT_LIST_HEAD(&conn->mgmt_run_list);
1351
1352 /* initialize general xmit PDU commands queue */
1353 conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
1354 GFP_KERNEL, NULL);
1355 if (conn->xmitqueue == ERR_PTR(-ENOMEM))
1356 goto xmitqueue_alloc_fail;
1357
1358 /* initialize general immediate & non-immediate PDU commands queue */
1359 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1360 GFP_KERNEL, NULL);
1361 if (conn->immqueue == ERR_PTR(-ENOMEM))
1362 goto immqueue_alloc_fail;
1363
1364 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1365 GFP_KERNEL, NULL);
1366 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1367 goto mgmtqueue_alloc_fail;
1368
1369 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1370
1371 /* allocate login_mtask used for the login/text sequences */
1372 spin_lock_bh(&session->lock);
1373 if (!__kfifo_get(session->mgmtpool.queue,
1374 (void*)&conn->login_mtask,
1375 sizeof(void*))) {
1376 spin_unlock_bh(&session->lock);
1377 goto login_mtask_alloc_fail;
1378 }
1379 spin_unlock_bh(&session->lock);
1380
d36ab6f3
MC		 1381 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1382 if (!data)
1383 goto login_mtask_data_alloc_fail;
1384 conn->login_mtask->data = data;
1385
7996a778
MC		 1386 init_timer(&conn->tmabort_timer);
1387 mutex_init(&conn->xmitmutex);
1388 init_waitqueue_head(&conn->ehwait);
1389
1390 return cls_conn;
1391
d36ab6f3
MC		 1392login_mtask_data_alloc_fail:
1393 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1394 sizeof(void*));
7996a778
MC		 1395login_mtask_alloc_fail:
1396 kfifo_free(conn->mgmtqueue);
1397mgmtqueue_alloc_fail:
1398 kfifo_free(conn->immqueue);
1399immqueue_alloc_fail:
1400 kfifo_free(conn->xmitqueue);
1401xmitqueue_alloc_fail:
1402 iscsi_destroy_conn(cls_conn);
1403 return NULL;
1404}
1405EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1406
1407/**
1408 * iscsi_conn_teardown - teardown iscsi connection
1409 * cls_conn: iscsi class connection
1410 *
1411 * TODO: we may need to make this into a two step process
1412 * like scsi-mls remove + put host
1413 */
1414void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1415{
1416 struct iscsi_conn *conn = cls_conn->dd_data;
1417 struct iscsi_session *session = conn->session;
1418 unsigned long flags;
1419
7996a778 1420 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1421 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1422 if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) {
1423 if (session->tt->suspend_conn_recv)
1424 session->tt->suspend_conn_recv(conn);
1425
1426 session->tt->terminate_conn(conn);
1427 }
1428
1429 spin_lock_bh(&session->lock);
1430 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1431 if (session->leadconn == conn) {
1432 /*
1433 * leading connection? then give up on recovery.
1434 */
1435 session->state = ISCSI_STATE_TERMINATE;
1436 wake_up(&conn->ehwait);
1437 }
1438 spin_unlock_bh(&session->lock);
1439
1440 mutex_unlock(&conn->xmitmutex);
1441
1442 /*
1443 * Block until all in-progress commands for this connection
1444 * time out or fail.
1445 */
1446 for (;;) {
1447 spin_lock_irqsave(session->host->host_lock, flags);
1448 if (!session->host->host_busy) { /* OK for ERL == 0 */
1449 spin_unlock_irqrestore(session->host->host_lock, flags);
1450 break;
1451 }
1452 spin_unlock_irqrestore(session->host->host_lock, flags);
1453 msleep_interruptible(500);
be2df72e
OG		 1454 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1455 "host_failed %d\n", session->host->host_busy,
1456 session->host->host_failed);
7996a778
MC		 1457 /*
1458 * force eh_abort() to unblock
1459 */
1460 wake_up(&conn->ehwait);
1461 }
1462
1463 spin_lock_bh(&session->lock);
d36ab6f3 1464 kfree(conn->login_mtask->data);
7996a778
MC		 1465 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1466 sizeof(void*));
1467 list_del(&conn->item);
1468 if (list_empty(&session->connections))
1469 session->leadconn = NULL;
1470 if (session->leadconn && session->leadconn == conn)
1471 session->leadconn = container_of(session->connections.next,
1472 struct iscsi_conn, item);
1473
1474 if (session->leadconn == NULL)
1475 /* no connections exits.. reset sequencing */
1476 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1477 spin_unlock_bh(&session->lock);
1478
1479 kfifo_free(conn->xmitqueue);
1480 kfifo_free(conn->immqueue);
1481 kfifo_free(conn->mgmtqueue);
1482
1483 iscsi_destroy_conn(cls_conn);
1484}
1485EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1486
1487int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1488{
1489 struct iscsi_conn *conn = cls_conn->dd_data;
1490 struct iscsi_session *session = conn->session;
1491
1492 if (session == NULL) {
1493 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1494 return -EPERM;
1495 }
1496
1497 spin_lock_bh(&session->lock);
1498 conn->c_stage = ISCSI_CONN_STARTED;
1499 session->state = ISCSI_STATE_LOGGED_IN;
1500
1501 switch(conn->stop_stage) {
1502 case STOP_CONN_RECOVER:
1503 /*
1504 * unblock eh_abort() if it is blocked. re-try all
1505 * commands after successful recovery
1506 */
7996a778
MC		 1507 conn->stop_stage = 0;
1508 conn->tmabort_state = TMABORT_INITIAL;
1509 session->age++;
7996a778
MC		 1510 spin_unlock_bh(&session->lock);
1511
1512 iscsi_unblock_session(session_to_cls(session));
1513 wake_up(&conn->ehwait);
1514 return 0;
1515 case STOP_CONN_TERM:
7996a778 1516 conn->stop_stage = 0;
7996a778
MC		 1517 break;
1518 default:
1519 break;
1520 }
1521 spin_unlock_bh(&session->lock);
1522
1523 return 0;
1524}
1525EXPORT_SYMBOL_GPL(iscsi_conn_start);
1526
1527static void
1528flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1529{
1530 struct iscsi_mgmt_task *mtask, *tmp;
1531
1532 /* handle pending */
1533 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1534 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1535 if (mtask == conn->login_mtask)
1536 continue;
1537 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1538 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1539 sizeof(void*));
1540 }
1541
1542 /* handle running */
1543 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1544 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1545 list_del(&mtask->running);
1546
7996a778
MC		 1547 if (mtask == conn->login_mtask)
1548 continue;
ed2abc7f 1549 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1550 sizeof(void*));
1551 }
1552
1553 conn->mtask = NULL;
1554}
1555
1556/* Fail commands. Mutex and session lock held and recv side suspended */
1557static void fail_all_commands(struct iscsi_conn *conn)
1558{
1559 struct iscsi_cmd_task *ctask, *tmp;
1560
1561 /* flush pending */
1562 while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) {
1563 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1564 ctask->itt);
1565 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1566 }
1567
1568 /* fail all other running */
1569 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1570 debug_scsi("failing in progress sc %p itt 0x%x\n",
1571 ctask->sc, ctask->itt);
1572 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1573 }
1574
1575 conn->ctask = NULL;
1576}
1577
656cffc9
MC		 1578static void iscsi_start_session_recovery(struct iscsi_session *session,
1579 struct iscsi_conn *conn, int flag)
7996a778 1580{
ed2abc7f
MC		 1581 int old_stop_stage;
1582
7996a778 1583 spin_lock_bh(&session->lock);
ed2abc7f 1584 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1585 spin_unlock_bh(&session->lock);
1586 return;
1587 }
ed2abc7f
MC		 1588
1589 /*
1590 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1591 * up the login task and connection. We do not need to block and set
1592 * the recovery state again
ed2abc7f 1593 */
67a61114
MC		 1594 if (flag == STOP_CONN_TERM)
1595 session->state = ISCSI_STATE_TERMINATE;
1596 else if (conn->stop_stage != STOP_CONN_RECOVER)
1597 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1598
1599 old_stop_stage = conn->stop_stage;
7996a778 1600 conn->stop_stage = flag;
67a61114
MC		 1601 conn->c_stage = ISCSI_CONN_STOPPED;
1602 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1603 spin_unlock_bh(&session->lock);
1604
1605 if (session->tt->suspend_conn_recv)
1606 session->tt->suspend_conn_recv(conn);
1607
1608 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1609 /*
1610 * for connection level recovery we should not calculate
1611 * header digest. conn->hdr_size used for optimization
1612 * in hdr_extract() and will be re-negotiated at
1613 * set_param() time.
1614 */
1615 if (flag == STOP_CONN_RECOVER) {
1616 conn->hdrdgst_en = 0;
1617 conn->datadgst_en = 0;
656cffc9 1618 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1619 old_stop_stage != STOP_CONN_RECOVER) {
1620 debug_scsi("blocking session\n");
7996a778 1621 iscsi_block_session(session_to_cls(session));
67a61114 1622 }
7996a778 1623 }
656cffc9
MC		 1624
1625 session->tt->terminate_conn(conn);
1626 /*
1627 * flush queues.
1628 */
1629 spin_lock_bh(&session->lock);
1630 fail_all_commands(conn);
1631 flush_control_queues(session, conn);
1632 spin_unlock_bh(&session->lock);
1633
7996a778
MC		 1634 mutex_unlock(&conn->xmitmutex);
1635}
7996a778
MC		 1636
1637void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1638{
1639 struct iscsi_conn *conn = cls_conn->dd_data;
1640 struct iscsi_session *session = conn->session;
1641
1642 switch (flag) {
1643 case STOP_CONN_RECOVER:
1644 case STOP_CONN_TERM:
1645 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1646 break;
7996a778 1647 default:
be2df72e 1648 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1649 }
1650}
1651EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1652
1653int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1654 struct iscsi_cls_conn *cls_conn, int is_leading)
1655{
1656 struct iscsi_session *session = class_to_transport_session(cls_session);
1657 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
1658
1659 /* lookup for existing connection */
1660 spin_lock_bh(&session->lock);
1661 list_for_each_entry(tmp, &session->connections, item) {
1662 if (tmp == conn) {
1663 if (conn->c_stage != ISCSI_CONN_STOPPED ||
1664 conn->stop_stage == STOP_CONN_TERM) {
be2df72e 1665 printk(KERN_ERR "iscsi: can't bind "
7996a778
MC		 1666 "non-stopped connection (%d:%d)\n",
1667 conn->c_stage, conn->stop_stage);
1668 spin_unlock_bh(&session->lock);
1669 return -EIO;
1670 }
1671 break;
1672 }
1673 }
1674 if (tmp != conn) {
1675 /* bind new iSCSI connection to session */
1676 conn->session = session;
1677 list_add(&conn->item, &session->connections);
1678 }
1679 spin_unlock_bh(&session->lock);
1680
1681 if (is_leading)
1682 session->leadconn = conn;
1683
1684 /*
1685 * Unblock xmitworker(), Login Phase will pass through.
1686 */
1687 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1688 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1689 return 0;
1690}
1691EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1692
1693MODULE_AUTHOR("Mike Christie");
1694MODULE_DESCRIPTION("iSCSI library functions");
1695MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree