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
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.
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.
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.
24 #include <linux/types.h>
25 #include <linux/mutex.h>
26 #include <linux/kfifo.h>
27 #include <linux/delay.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>
40 struct iscsi_session *
41 class_to_transport_session(struct iscsi_cls_session *cls_session)
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
46 EXPORT_SYMBOL_GPL(class_to_transport_session);
48 #define INVALID_SN_DELTA 0xffff
51 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
53 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
54 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
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;
68 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
70 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
71 struct iscsi_data *hdr)
73 struct iscsi_conn *conn = ctask->conn;
75 memset(hdr, 0, sizeof(struct iscsi_data));
76 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
77 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
78 ctask->unsol_datasn++;
79 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
80 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
82 hdr->itt = ctask->hdr->itt;
83 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
84 hdr->offset = cpu_to_be32(ctask->unsol_offset);
86 if (ctask->unsol_count > conn->max_xmit_dlength) {
87 hton24(hdr->dlength, conn->max_xmit_dlength);
88 ctask->data_count = conn->max_xmit_dlength;
89 ctask->unsol_offset += ctask->data_count;
92 hton24(hdr->dlength, ctask->unsol_count);
93 ctask->data_count = ctask->unsol_count;
94 hdr->flags = ISCSI_FLAG_CMD_FINAL;
97 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
100 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
101 * @ctask: iscsi cmd task
103 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
104 * fields like dlength or final based on how much data it sends
106 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
108 struct iscsi_conn *conn = ctask->conn;
109 struct iscsi_session *session = conn->session;
110 struct iscsi_cmd *hdr = ctask->hdr;
111 struct scsi_cmnd *sc = ctask->sc;
113 hdr->opcode = ISCSI_OP_SCSI_CMD;
114 hdr->flags = ISCSI_ATTR_SIMPLE;
115 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
116 hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
117 (session->age << ISCSI_AGE_SHIFT);
118 hdr->data_length = cpu_to_be32(sc->request_bufflen);
119 hdr->cmdsn = cpu_to_be32(session->cmdsn);
121 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
122 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
123 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
125 ctask->data_count = 0;
126 if (sc->sc_data_direction == DMA_TO_DEVICE) {
127 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
131 * imm_count bytes to be sent right after
134 * unsol_count bytes(as Data-Out) to be sent
135 * without R2T ack right after
138 * r2t_data_count bytes to be sent via R2T ack's
140 * pad_count bytes to be sent as zero-padding
142 ctask->imm_count = 0;
143 ctask->unsol_count = 0;
144 ctask->unsol_offset = 0;
145 ctask->unsol_datasn = 0;
147 if (session->imm_data_en) {
148 if (ctask->total_length >= session->first_burst)
149 ctask->imm_count = min(session->first_burst,
150 conn->max_xmit_dlength);
152 ctask->imm_count = min(ctask->total_length,
153 conn->max_xmit_dlength);
154 hton24(ctask->hdr->dlength, ctask->imm_count);
156 zero_data(ctask->hdr->dlength);
158 if (!session->initial_r2t_en) {
159 ctask->unsol_count = min(session->first_burst,
160 ctask->total_length) - ctask->imm_count;
161 ctask->unsol_offset = ctask->imm_count;
164 if (!ctask->unsol_count)
165 /* No unsolicit Data-Out's */
166 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
169 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
170 zero_data(hdr->dlength);
172 if (sc->sc_data_direction == DMA_FROM_DEVICE)
173 hdr->flags |= ISCSI_FLAG_CMD_READ;
176 conn->scsicmd_pdus_cnt++;
178 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
181 * iscsi_complete_command - return command back to scsi-ml
182 * @ctask: iscsi cmd task
184 * Must be called with session lock.
185 * This function returns the scsi command to scsi-ml and returns
186 * the cmd task to the pool of available cmd tasks.
188 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
190 struct iscsi_session *session = ctask->conn->session;
191 struct scsi_cmnd *sc = ctask->sc;
193 ctask->state = ISCSI_TASK_COMPLETED;
195 list_del_init(&ctask->running);
196 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
200 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
202 atomic_inc(&ctask->refcount);
205 static void iscsi_get_ctask(struct iscsi_cmd_task *ctask)
207 spin_lock_bh(&ctask->conn->session->lock);
208 __iscsi_get_ctask(ctask);
209 spin_unlock_bh(&ctask->conn->session->lock);
212 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
214 struct iscsi_conn *conn = ctask->conn;
216 if (atomic_dec_and_test(&ctask->refcount)) {
217 conn->session->tt->cleanup_cmd_task(conn, ctask);
218 iscsi_complete_command(ctask);
222 static void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
224 spin_lock_bh(&ctask->conn->session->lock);
225 __iscsi_put_ctask(ctask);
226 spin_unlock_bh(&ctask->conn->session->lock);
230 * iscsi_cmd_rsp - SCSI Command Response processing
231 * @conn: iscsi connection
233 * @ctask: scsi command task
234 * @data: cmd data buffer
235 * @datalen: len of buffer
237 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
238 * then completes the command and task.
240 static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
241 struct iscsi_cmd_task *ctask, char *data,
245 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
246 struct iscsi_session *session = conn->session;
247 struct scsi_cmnd *sc = ctask->sc;
249 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
251 sc->result = DID_ERROR << 16;
255 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
257 sc->result = (DID_OK << 16) | rhdr->cmd_status;
259 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
260 sc->result = DID_ERROR << 16;
264 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
269 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
270 "invalid data buffer size of %d\n", datalen);
271 sc->result = DID_BAD_TARGET << 16;
275 senselen = (data[0] << 8) | data[1];
276 if (datalen < senselen)
277 goto invalid_datalen;
279 memcpy(sc->sense_buffer, data + 2,
280 min(senselen, SCSI_SENSE_BUFFERSIZE));
281 debug_scsi("copied %d bytes of sense\n",
282 min(senselen, SCSI_SENSE_BUFFERSIZE));
285 if (sc->sc_data_direction == DMA_TO_DEVICE)
288 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
289 int res_count = be32_to_cpu(rhdr->residual_count);
291 if (res_count > 0 && res_count <= sc->request_bufflen)
292 sc->resid = res_count;
294 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
295 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
296 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
297 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
298 sc->resid = be32_to_cpu(rhdr->residual_count);
301 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
302 (long)sc, sc->result, ctask->itt);
303 conn->scsirsp_pdus_cnt++;
305 __iscsi_put_ctask(ctask);
309 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
311 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
313 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
314 conn->tmfrsp_pdus_cnt++;
316 if (conn->tmabort_state != TMABORT_INITIAL)
319 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
320 conn->tmabort_state = TMABORT_SUCCESS;
321 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
322 conn->tmabort_state = TMABORT_NOT_FOUND;
324 conn->tmabort_state = TMABORT_FAILED;
325 wake_up(&conn->ehwait);
328 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
329 char *data, int datalen)
331 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
332 struct iscsi_hdr rejected_pdu;
335 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
337 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
338 if (ntoh24(reject->dlength) > datalen)
339 return ISCSI_ERR_PROTO;
341 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
342 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
343 itt = rejected_pdu.itt & ISCSI_ITT_MASK;
344 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
345 "due to DataDigest error.\n", itt,
346 rejected_pdu.opcode);
353 * __iscsi_complete_pdu - complete pdu
357 * @datalen: len of data buffer
359 * Completes pdu processing by freeing any resources allocated at
360 * queuecommand or send generic. session lock must be held and verify
361 * itt must have been called.
363 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
364 char *data, int datalen)
366 struct iscsi_session *session = conn->session;
367 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
368 struct iscsi_cmd_task *ctask;
369 struct iscsi_mgmt_task *mtask;
372 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG))
373 itt = hdr->itt & ISCSI_ITT_MASK;
377 if (itt < session->cmds_max) {
378 ctask = session->cmds[itt];
380 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
381 opcode, conn->id, ctask->itt, datalen);
384 case ISCSI_OP_SCSI_CMD_RSP:
385 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
386 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
389 case ISCSI_OP_SCSI_DATA_IN:
390 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
391 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
392 conn->scsirsp_pdus_cnt++;
393 __iscsi_put_ctask(ctask);
397 /* LLD handles this for now */
400 rc = ISCSI_ERR_BAD_OPCODE;
403 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
404 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
405 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
407 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
408 opcode, conn->id, mtask->itt, datalen);
410 rc = iscsi_check_assign_cmdsn(session,
411 (struct iscsi_nopin*)hdr);
416 case ISCSI_OP_LOGOUT_RSP:
418 rc = ISCSI_ERR_PROTO;
421 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
423 case ISCSI_OP_LOGIN_RSP:
424 case ISCSI_OP_TEXT_RSP:
426 * login related PDU's exp_statsn is handled in
429 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
430 rc = ISCSI_ERR_CONN_FAILED;
431 list_del(&mtask->running);
432 if (conn->login_mtask != mtask)
433 __kfifo_put(session->mgmtpool.queue,
434 (void*)&mtask, sizeof(void*));
436 case ISCSI_OP_SCSI_TMFUNC_RSP:
438 rc = ISCSI_ERR_PROTO;
442 iscsi_tmf_rsp(conn, hdr);
444 case ISCSI_OP_NOOP_IN:
445 if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) {
446 rc = ISCSI_ERR_PROTO;
449 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
451 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
452 rc = ISCSI_ERR_CONN_FAILED;
453 list_del(&mtask->running);
454 if (conn->login_mtask != mtask)
455 __kfifo_put(session->mgmtpool.queue,
456 (void*)&mtask, sizeof(void*));
459 rc = ISCSI_ERR_BAD_OPCODE;
462 } else if (itt == ISCSI_RESERVED_TAG) {
463 rc = iscsi_check_assign_cmdsn(session,
464 (struct iscsi_nopin*)hdr);
469 case ISCSI_OP_NOOP_IN:
471 rc = ISCSI_ERR_PROTO;
475 if (hdr->ttt == ISCSI_RESERVED_TAG)
478 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
479 rc = ISCSI_ERR_CONN_FAILED;
481 case ISCSI_OP_REJECT:
482 rc = iscsi_handle_reject(conn, hdr, data, datalen);
484 case ISCSI_OP_ASYNC_EVENT:
485 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
486 /* we need sth like iscsi_async_event_rsp() */
487 rc = ISCSI_ERR_BAD_OPCODE;
490 rc = ISCSI_ERR_BAD_OPCODE;
494 rc = ISCSI_ERR_BAD_ITT;
499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
501 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
502 char *data, int datalen)
506 spin_lock(&conn->session->lock);
507 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
508 spin_unlock(&conn->session->lock);
511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
513 /* verify itt (itt encoding: age+cid+itt) */
514 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
517 struct iscsi_session *session = conn->session;
518 struct iscsi_cmd_task *ctask;
521 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
522 if ((hdr->itt & ISCSI_AGE_MASK) !=
523 (session->age << ISCSI_AGE_SHIFT)) {
524 printk(KERN_ERR "iscsi: received itt %x expected "
525 "session age (%x)\n", hdr->itt,
526 session->age & ISCSI_AGE_MASK);
527 return ISCSI_ERR_BAD_ITT;
530 if ((hdr->itt & ISCSI_CID_MASK) !=
531 (conn->id << ISCSI_CID_SHIFT)) {
532 printk(KERN_ERR "iscsi: received itt %x, expected "
533 "CID (%x)\n", hdr->itt, conn->id);
534 return ISCSI_ERR_BAD_ITT;
536 itt = hdr->itt & ISCSI_ITT_MASK;
540 if (itt < session->cmds_max) {
541 ctask = session->cmds[itt];
544 printk(KERN_INFO "iscsi: dropping ctask with "
545 "itt 0x%x\n", ctask->itt);
547 return ISCSI_ERR_NO_SCSI_CMD;
550 if (ctask->sc->SCp.phase != session->age) {
551 printk(KERN_ERR "iscsi: ctask's session age %d, "
552 "expected %d\n", ctask->sc->SCp.phase,
554 return ISCSI_ERR_SESSION_FAILED;
561 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
563 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
565 struct iscsi_session *session = conn->session;
568 spin_lock_irqsave(&session->lock, flags);
569 if (session->state == ISCSI_STATE_FAILED) {
570 spin_unlock_irqrestore(&session->lock, flags);
574 if (conn->stop_stage == 0)
575 session->state = ISCSI_STATE_FAILED;
576 spin_unlock_irqrestore(&session->lock, flags);
577 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
578 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
579 iscsi_conn_error(conn->cls_conn, err);
581 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
584 * iscsi_data_xmit - xmit any command into the scheduled connection
585 * @conn: iscsi connection
588 * The function can return -EAGAIN in which case the caller must
589 * re-schedule it again later or recover. '0' return code means
592 static int iscsi_data_xmit(struct iscsi_conn *conn)
594 struct iscsi_transport *tt;
597 if (unlikely(conn->suspend_tx)) {
598 debug_scsi("conn %d Tx suspended!\n", conn->id);
601 tt = conn->session->tt;
604 * Transmit in the following order:
606 * 1) un-finished xmit (ctask or mtask)
607 * 2) immediate control PDUs
610 * 5) non-immediate control PDUs
612 * No need to lock around __kfifo_get as long as
613 * there's one producer and one consumer.
616 BUG_ON(conn->ctask && conn->mtask);
619 iscsi_get_ctask(conn->ctask);
620 rc = tt->xmit_cmd_task(conn, conn->ctask);
621 iscsi_put_ctask(conn->ctask);
624 /* done with this in-progress ctask */
628 rc = tt->xmit_mgmt_task(conn, conn->mtask);
631 /* done with this in-progress mtask */
635 /* process immediate first */
636 if (unlikely(__kfifo_len(conn->immqueue))) {
637 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
639 spin_lock_bh(&conn->session->lock);
640 list_add_tail(&conn->mtask->running,
641 &conn->mgmt_run_list);
642 spin_unlock_bh(&conn->session->lock);
643 rc = tt->xmit_mgmt_task(conn, conn->mtask);
647 /* done with this mtask */
651 /* process command queue */
652 spin_lock_bh(&conn->session->lock);
653 while (!list_empty(&conn->xmitqueue)) {
655 * iscsi tcp may readd the task to the xmitqueue to send
658 conn->ctask = list_entry(conn->xmitqueue.next,
659 struct iscsi_cmd_task, running);
660 conn->ctask->state = ISCSI_TASK_RUNNING;
661 list_move_tail(conn->xmitqueue.next, &conn->run_list);
662 __iscsi_get_ctask(conn->ctask);
663 spin_unlock_bh(&conn->session->lock);
665 rc = tt->xmit_cmd_task(conn, conn->ctask);
669 spin_lock_bh(&conn->session->lock);
670 __iscsi_put_ctask(conn->ctask);
672 spin_unlock_bh(&conn->session->lock);
676 spin_unlock_bh(&conn->session->lock);
677 /* done with this ctask */
680 /* process the rest control plane PDUs, if any */
681 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
682 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
684 spin_lock_bh(&conn->session->lock);
685 list_add_tail(&conn->mtask->running,
686 &conn->mgmt_run_list);
687 spin_unlock_bh(&conn->session->lock);
688 rc = tt->xmit_mgmt_task(conn, conn->mtask);
692 /* done with this mtask */
699 if (unlikely(conn->suspend_tx))
705 static void iscsi_xmitworker(void *data)
707 struct iscsi_conn *conn = data;
710 * serialize Xmit worker on a per-connection basis.
712 mutex_lock(&conn->xmitmutex);
714 rc = iscsi_data_xmit(conn);
715 } while (rc >= 0 || rc == -EAGAIN);
716 mutex_unlock(&conn->xmitmutex);
720 FAILURE_BAD_HOST = 1,
721 FAILURE_SESSION_FAILED,
722 FAILURE_SESSION_FREED,
723 FAILURE_WINDOW_CLOSED,
725 FAILURE_SESSION_TERMINATE,
726 FAILURE_SESSION_IN_RECOVERY,
727 FAILURE_SESSION_RECOVERY_TIMEOUT,
730 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
732 struct Scsi_Host *host;
734 struct iscsi_session *session;
735 struct iscsi_conn *conn;
736 struct iscsi_cmd_task *ctask = NULL;
738 sc->scsi_done = done;
741 host = sc->device->host;
742 session = iscsi_hostdata(host->hostdata);
744 spin_lock(&session->lock);
747 * ISCSI_STATE_FAILED is a temp. state. The recovery
748 * code will decide what is best to do with command queued
751 if (session->state != ISCSI_STATE_LOGGED_IN &&
752 session->state != ISCSI_STATE_FAILED) {
754 * to handle the race between when we set the recovery state
755 * and block the session we requeue here (commands could
756 * be entering our queuecommand while a block is starting
757 * up because the block code is not locked)
759 if (session->state == ISCSI_STATE_IN_RECOVERY) {
760 reason = FAILURE_SESSION_IN_RECOVERY;
764 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
765 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
766 else if (session->state == ISCSI_STATE_TERMINATE)
767 reason = FAILURE_SESSION_TERMINATE;
769 reason = FAILURE_SESSION_FREED;
774 * Check for iSCSI window and take care of CmdSN wrap-around
776 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
777 reason = FAILURE_WINDOW_CLOSED;
781 conn = session->leadconn;
783 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
785 reason = FAILURE_OOM;
788 sc->SCp.phase = session->age;
789 sc->SCp.ptr = (char *)ctask;
791 atomic_set(&ctask->refcount, 1);
792 ctask->state = ISCSI_TASK_PENDING;
796 INIT_LIST_HEAD(&ctask->running);
797 ctask->total_length = sc->request_bufflen;
798 iscsi_prep_scsi_cmd_pdu(ctask);
800 session->tt->init_cmd_task(ctask);
802 list_add_tail(&ctask->running, &conn->xmitqueue);
804 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
805 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
806 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
807 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
808 spin_unlock(&session->lock);
810 scsi_queue_work(host, &conn->xmitwork);
814 spin_unlock(&session->lock);
815 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
816 return SCSI_MLQUEUE_HOST_BUSY;
819 spin_unlock(&session->lock);
820 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
821 sc->cmnd[0], reason);
822 sc->result = (DID_NO_CONNECT << 16);
823 sc->resid = sc->request_bufflen;
827 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
829 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
831 if (depth > ISCSI_MAX_CMD_PER_LUN)
832 depth = ISCSI_MAX_CMD_PER_LUN;
833 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
834 return sdev->queue_depth;
836 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
839 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
840 char *data, uint32_t data_size)
842 struct iscsi_session *session = conn->session;
843 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
844 struct iscsi_mgmt_task *mtask;
846 spin_lock_bh(&session->lock);
847 if (session->state == ISCSI_STATE_TERMINATE) {
848 spin_unlock_bh(&session->lock);
851 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
852 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
854 * Login and Text are sent serially, in
855 * request-followed-by-response sequence.
856 * Same mtask can be used. Same ITT must be used.
857 * Note that login_mtask is preallocated at conn_create().
859 mtask = conn->login_mtask;
861 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
862 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
864 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
865 if (!__kfifo_get(session->mgmtpool.queue,
866 (void*)&mtask, sizeof(void*))) {
867 spin_unlock_bh(&session->lock);
873 * pre-format CmdSN for outgoing PDU.
875 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
876 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
877 (session->age << ISCSI_AGE_SHIFT);
878 nop->cmdsn = cpu_to_be32(session->cmdsn);
879 if (conn->c_stage == ISCSI_CONN_STARTED &&
880 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
883 /* do not advance CmdSN */
884 nop->cmdsn = cpu_to_be32(session->cmdsn);
887 memcpy(mtask->data, data, data_size);
888 mtask->data_count = data_size;
890 mtask->data_count = 0;
892 INIT_LIST_HEAD(&mtask->running);
893 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
894 if (session->tt->init_mgmt_task)
895 session->tt->init_mgmt_task(conn, mtask, data, data_size);
896 spin_unlock_bh(&session->lock);
898 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
899 hdr->opcode, hdr->itt, data_size);
902 * since send_pdu() could be called at least from two contexts,
903 * we need to serialize __kfifo_put, so we don't have to take
904 * additional lock on fast data-path
906 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
907 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
909 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
911 scsi_queue_work(session->host, &conn->xmitwork);
915 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
916 char *data, uint32_t data_size)
918 struct iscsi_conn *conn = cls_conn->dd_data;
921 mutex_lock(&conn->xmitmutex);
922 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
923 mutex_unlock(&conn->xmitmutex);
927 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
929 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
931 struct iscsi_session *session = class_to_transport_session(cls_session);
932 struct iscsi_conn *conn = session->leadconn;
934 spin_lock_bh(&session->lock);
935 if (session->state != ISCSI_STATE_LOGGED_IN) {
936 session->state = ISCSI_STATE_RECOVERY_FAILED;
938 wake_up(&conn->ehwait);
940 spin_unlock_bh(&session->lock);
942 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
944 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
946 struct Scsi_Host *host = sc->device->host;
947 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
948 struct iscsi_conn *conn = session->leadconn;
949 int fail_session = 0;
951 spin_lock_bh(&session->lock);
952 if (session->state == ISCSI_STATE_TERMINATE) {
954 debug_scsi("failing host reset: session terminated "
955 "[CID %d age %d]", conn->id, session->age);
956 spin_unlock_bh(&session->lock);
960 if (sc->SCp.phase == session->age) {
961 debug_scsi("failing connection CID %d due to SCSI host reset",
965 spin_unlock_bh(&session->lock);
968 * we drop the lock here but the leadconn cannot be destoyed while
969 * we are in the scsi eh
972 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
974 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
975 wait_event_interruptible(conn->ehwait,
976 session->state == ISCSI_STATE_TERMINATE ||
977 session->state == ISCSI_STATE_LOGGED_IN ||
978 session->state == ISCSI_STATE_RECOVERY_FAILED);
979 if (signal_pending(current))
980 flush_signals(current);
982 spin_lock_bh(&session->lock);
983 if (session->state == ISCSI_STATE_LOGGED_IN)
984 printk(KERN_INFO "iscsi: host reset succeeded\n");
987 spin_unlock_bh(&session->lock);
991 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
993 static void iscsi_tmabort_timedout(unsigned long data)
995 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
996 struct iscsi_conn *conn = ctask->conn;
997 struct iscsi_session *session = conn->session;
999 spin_lock(&session->lock);
1000 if (conn->tmabort_state == TMABORT_INITIAL) {
1001 conn->tmabort_state = TMABORT_TIMEDOUT;
1002 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1003 ctask->sc, ctask->itt);
1004 /* unblock eh_abort() */
1005 wake_up(&conn->ehwait);
1007 spin_unlock(&session->lock);
1010 /* must be called with the mutex lock */
1011 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1012 struct iscsi_cmd_task *ctask)
1014 struct iscsi_conn *conn = ctask->conn;
1015 struct iscsi_session *session = conn->session;
1016 struct iscsi_tm *hdr = &conn->tmhdr;
1020 * ctask timed out but session is OK requests must be serialized.
1022 memset(hdr, 0, sizeof(struct iscsi_tm));
1023 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1024 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1025 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1026 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1027 hdr->rtt = ctask->hdr->itt;
1028 hdr->refcmdsn = ctask->hdr->cmdsn;
1030 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1033 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1034 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
1038 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1040 spin_lock_bh(&session->lock);
1041 ctask->mtask = (struct iscsi_mgmt_task *)
1042 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
1043 ISCSI_MGMT_ITT_OFFSET];
1045 if (conn->tmabort_state == TMABORT_INITIAL) {
1046 conn->tmfcmd_pdus_cnt++;
1047 conn->tmabort_timer.expires = 10*HZ + jiffies;
1048 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1049 conn->tmabort_timer.data = (unsigned long)ctask;
1050 add_timer(&conn->tmabort_timer);
1051 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
1053 spin_unlock_bh(&session->lock);
1054 mutex_unlock(&conn->xmitmutex);
1057 * block eh thread until:
1061 * 3) session is terminated or restarted or userspace has
1062 * given up on recovery
1064 wait_event_interruptible(conn->ehwait,
1065 sc->SCp.phase != session->age ||
1066 session->state != ISCSI_STATE_LOGGED_IN ||
1067 conn->tmabort_state != TMABORT_INITIAL);
1068 if (signal_pending(current))
1069 flush_signals(current);
1070 del_timer_sync(&conn->tmabort_timer);
1072 mutex_lock(&conn->xmitmutex);
1077 * xmit mutex and session lock must be held
1079 static struct iscsi_mgmt_task *
1080 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1082 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1083 struct iscsi_mgmt_task *task;
1085 debug_scsi("searching %d tasks\n", nr_tasks);
1087 for (i = 0; i < nr_tasks; i++) {
1088 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1089 debug_scsi("check task %u\n", task->itt);
1091 if (task->itt == itt) {
1092 debug_scsi("matched task\n");
1096 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1101 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1103 struct iscsi_conn *conn = ctask->conn;
1104 struct iscsi_session *session = conn->session;
1109 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1110 list_del(&ctask->mtask->running);
1111 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1113 ctask->mtask = NULL;
1118 * session lock and xmitmutex must be held
1120 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1123 struct scsi_cmnd *sc;
1128 iscsi_ctask_mtask_cleanup(ctask);
1131 sc->resid = sc->request_bufflen;
1132 __iscsi_put_ctask(ctask);
1135 int iscsi_eh_abort(struct scsi_cmnd *sc)
1137 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1138 struct iscsi_conn *conn = ctask->conn;
1139 struct iscsi_session *session = conn->session;
1142 conn->eh_abort_cnt++;
1143 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1145 mutex_lock(&conn->xmitmutex);
1146 spin_lock_bh(&session->lock);
1149 * If we are not logged in or we have started a new session
1150 * then let the host reset code handle this
1152 if (session->state != ISCSI_STATE_LOGGED_IN ||
1153 sc->SCp.phase != session->age)
1156 /* ctask completed before time out */
1158 spin_unlock_bh(&session->lock);
1159 debug_scsi("sc completed while abort in progress\n");
1160 goto success_rel_mutex;
1163 /* what should we do here ? */
1164 if (conn->ctask == ctask) {
1165 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1166 "Failing abort\n", sc, ctask->itt);
1170 if (ctask->state == ISCSI_TASK_PENDING)
1171 goto success_cleanup;
1173 conn->tmabort_state = TMABORT_INITIAL;
1175 spin_unlock_bh(&session->lock);
1176 rc = iscsi_exec_abort_task(sc, ctask);
1177 spin_lock_bh(&session->lock);
1179 if (rc || sc->SCp.phase != session->age ||
1180 session->state != ISCSI_STATE_LOGGED_IN)
1182 iscsi_ctask_mtask_cleanup(ctask);
1184 switch (conn->tmabort_state) {
1185 case TMABORT_SUCCESS:
1186 goto success_cleanup;
1187 case TMABORT_NOT_FOUND:
1189 /* ctask completed before tmf abort response */
1190 spin_unlock_bh(&session->lock);
1191 debug_scsi("sc completed while abort in progress\n");
1192 goto success_rel_mutex;
1196 /* timedout or failed */
1197 spin_unlock_bh(&session->lock);
1198 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1199 spin_lock_bh(&session->lock);
1204 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1205 spin_unlock_bh(&session->lock);
1208 * clean up task if aborted. we have the xmitmutex so grab
1209 * the recv lock as a writer
1211 write_lock_bh(conn->recv_lock);
1212 spin_lock(&session->lock);
1213 fail_command(conn, ctask, DID_ABORT << 16);
1214 spin_unlock(&session->lock);
1215 write_unlock_bh(conn->recv_lock);
1218 mutex_unlock(&conn->xmitmutex);
1222 spin_unlock_bh(&session->lock);
1223 mutex_unlock(&conn->xmitmutex);
1225 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1228 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1231 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1235 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1240 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1241 if (q->pool == NULL) {
1246 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1248 if (q->queue == ERR_PTR(-ENOMEM)) {
1254 for (i = 0; i < max; i++) {
1255 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1256 if (q->pool[i] == NULL) {
1259 for (j = 0; j < i; j++)
1262 kfifo_free(q->queue);
1267 memset(q->pool[i], 0, item_size);
1268 (*items)[i] = q->pool[i];
1269 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1273 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1275 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1279 for (i = 0; i < q->max; i++)
1284 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1287 * iSCSI Session's hostdata organization:
1289 * *------------------* <== hostdata_session(host->hostdata)
1290 * | ptr to class sess|
1291 * |------------------| <== iscsi_hostdata(host->hostdata)
1293 * *------------------*
1296 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1297 _sz % sizeof(unsigned long))
1299 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1302 * iscsi_session_setup - create iscsi cls session and host and session
1303 * @scsit: scsi transport template
1304 * @iscsit: iscsi transport template
1305 * @initial_cmdsn: initial CmdSN
1306 * @hostno: host no allocated
1308 * This can be used by software iscsi_transports that allocate
1309 * a session per scsi host.
1311 struct iscsi_cls_session *
1312 iscsi_session_setup(struct iscsi_transport *iscsit,
1313 struct scsi_transport_template *scsit,
1314 int cmd_task_size, int mgmt_task_size,
1315 uint32_t initial_cmdsn, uint32_t *hostno)
1317 struct Scsi_Host *shost;
1318 struct iscsi_session *session;
1319 struct iscsi_cls_session *cls_session;
1322 shost = scsi_host_alloc(iscsit->host_template,
1323 hostdata_privsize(sizeof(*session)));
1328 shost->max_channel = 0;
1329 shost->max_lun = iscsit->max_lun;
1330 shost->max_cmd_len = iscsit->max_cmd_len;
1331 shost->transportt = scsit;
1332 shost->transportt->create_work_queue = 1;
1333 *hostno = shost->host_no;
1335 session = iscsi_hostdata(shost->hostdata);
1336 memset(session, 0, sizeof(struct iscsi_session));
1337 session->host = shost;
1338 session->state = ISCSI_STATE_FREE;
1339 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1340 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1341 session->cmdsn = initial_cmdsn;
1342 session->exp_cmdsn = initial_cmdsn + 1;
1343 session->max_cmdsn = initial_cmdsn + 1;
1344 session->max_r2t = 1;
1345 session->tt = iscsit;
1347 /* initialize SCSI PDU commands pool */
1348 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1349 (void***)&session->cmds,
1350 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1351 goto cmdpool_alloc_fail;
1353 /* pre-format cmds pool with ITT */
1354 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1355 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1358 ctask->dd_data = &ctask[1];
1360 INIT_LIST_HEAD(&ctask->running);
1363 spin_lock_init(&session->lock);
1364 INIT_LIST_HEAD(&session->connections);
1366 /* initialize immediate command pool */
1367 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1368 (void***)&session->mgmt_cmds,
1369 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1370 goto mgmtpool_alloc_fail;
1373 /* pre-format immediate cmds pool with ITT */
1374 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1375 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1378 mtask->dd_data = &mtask[1];
1379 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1380 INIT_LIST_HEAD(&mtask->running);
1383 if (scsi_add_host(shost, NULL))
1386 if (!try_module_get(iscsit->owner))
1387 goto cls_session_fail;
1389 cls_session = iscsi_create_session(shost, iscsit, 0);
1392 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1397 module_put(iscsit->owner);
1399 scsi_remove_host(shost);
1401 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1402 mgmtpool_alloc_fail:
1403 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1405 scsi_host_put(shost);
1408 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1411 * iscsi_session_teardown - destroy session, host, and cls_session
1414 * This can be used by software iscsi_transports that allocate
1415 * a session per scsi host.
1417 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1419 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1420 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1421 struct module *owner = cls_session->transport->owner;
1423 scsi_remove_host(shost);
1425 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1426 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1428 kfree(session->targetname);
1430 iscsi_destroy_session(cls_session);
1431 scsi_host_put(shost);
1434 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1437 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1438 * @cls_session: iscsi_cls_session
1441 struct iscsi_cls_conn *
1442 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1444 struct iscsi_session *session = class_to_transport_session(cls_session);
1445 struct iscsi_conn *conn;
1446 struct iscsi_cls_conn *cls_conn;
1449 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1452 conn = cls_conn->dd_data;
1453 memset(conn, 0, sizeof(*conn));
1455 conn->session = session;
1456 conn->cls_conn = cls_conn;
1457 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1458 conn->id = conn_idx;
1459 conn->exp_statsn = 0;
1460 conn->tmabort_state = TMABORT_INITIAL;
1461 INIT_LIST_HEAD(&conn->run_list);
1462 INIT_LIST_HEAD(&conn->mgmt_run_list);
1463 INIT_LIST_HEAD(&conn->xmitqueue);
1465 /* initialize general immediate & non-immediate PDU commands queue */
1466 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1468 if (conn->immqueue == ERR_PTR(-ENOMEM))
1469 goto immqueue_alloc_fail;
1471 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1473 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1474 goto mgmtqueue_alloc_fail;
1476 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1478 /* allocate login_mtask used for the login/text sequences */
1479 spin_lock_bh(&session->lock);
1480 if (!__kfifo_get(session->mgmtpool.queue,
1481 (void*)&conn->login_mtask,
1483 spin_unlock_bh(&session->lock);
1484 goto login_mtask_alloc_fail;
1486 spin_unlock_bh(&session->lock);
1488 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1490 goto login_mtask_data_alloc_fail;
1491 conn->login_mtask->data = conn->data = data;
1493 init_timer(&conn->tmabort_timer);
1494 mutex_init(&conn->xmitmutex);
1495 init_waitqueue_head(&conn->ehwait);
1499 login_mtask_data_alloc_fail:
1500 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1502 login_mtask_alloc_fail:
1503 kfifo_free(conn->mgmtqueue);
1504 mgmtqueue_alloc_fail:
1505 kfifo_free(conn->immqueue);
1506 immqueue_alloc_fail:
1507 iscsi_destroy_conn(cls_conn);
1510 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1513 * iscsi_conn_teardown - teardown iscsi connection
1514 * cls_conn: iscsi class connection
1516 * TODO: we may need to make this into a two step process
1517 * like scsi-mls remove + put host
1519 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1521 struct iscsi_conn *conn = cls_conn->dd_data;
1522 struct iscsi_session *session = conn->session;
1523 unsigned long flags;
1525 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1526 mutex_lock(&conn->xmitmutex);
1528 spin_lock_bh(&session->lock);
1529 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1530 if (session->leadconn == conn) {
1532 * leading connection? then give up on recovery.
1534 session->state = ISCSI_STATE_TERMINATE;
1535 wake_up(&conn->ehwait);
1537 spin_unlock_bh(&session->lock);
1539 mutex_unlock(&conn->xmitmutex);
1542 * Block until all in-progress commands for this connection
1546 spin_lock_irqsave(session->host->host_lock, flags);
1547 if (!session->host->host_busy) { /* OK for ERL == 0 */
1548 spin_unlock_irqrestore(session->host->host_lock, flags);
1551 spin_unlock_irqrestore(session->host->host_lock, flags);
1552 msleep_interruptible(500);
1553 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1554 "host_failed %d\n", session->host->host_busy,
1555 session->host->host_failed);
1557 * force eh_abort() to unblock
1559 wake_up(&conn->ehwait);
1562 spin_lock_bh(&session->lock);
1564 kfree(conn->persistent_address);
1565 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1567 list_del(&conn->item);
1568 if (list_empty(&session->connections))
1569 session->leadconn = NULL;
1570 if (session->leadconn && session->leadconn == conn)
1571 session->leadconn = container_of(session->connections.next,
1572 struct iscsi_conn, item);
1574 if (session->leadconn == NULL)
1575 /* no connections exits.. reset sequencing */
1576 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1577 spin_unlock_bh(&session->lock);
1579 kfifo_free(conn->immqueue);
1580 kfifo_free(conn->mgmtqueue);
1582 iscsi_destroy_conn(cls_conn);
1584 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1586 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1588 struct iscsi_conn *conn = cls_conn->dd_data;
1589 struct iscsi_session *session = conn->session;
1592 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1596 if (session->first_burst > session->max_burst) {
1597 printk("iscsi: invalid burst lengths: "
1598 "first_burst %d max_burst %d\n",
1599 session->first_burst, session->max_burst);
1603 spin_lock_bh(&session->lock);
1604 conn->c_stage = ISCSI_CONN_STARTED;
1605 session->state = ISCSI_STATE_LOGGED_IN;
1607 switch(conn->stop_stage) {
1608 case STOP_CONN_RECOVER:
1610 * unblock eh_abort() if it is blocked. re-try all
1611 * commands after successful recovery
1613 conn->stop_stage = 0;
1614 conn->tmabort_state = TMABORT_INITIAL;
1616 spin_unlock_bh(&session->lock);
1618 iscsi_unblock_session(session_to_cls(session));
1619 wake_up(&conn->ehwait);
1621 case STOP_CONN_TERM:
1622 conn->stop_stage = 0;
1627 spin_unlock_bh(&session->lock);
1631 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1634 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1636 struct iscsi_mgmt_task *mtask, *tmp;
1638 /* handle pending */
1639 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1640 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1641 if (mtask == conn->login_mtask)
1643 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1644 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1648 /* handle running */
1649 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1650 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1651 list_del(&mtask->running);
1653 if (mtask == conn->login_mtask)
1655 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1662 /* Fail commands. Mutex and session lock held and recv side suspended */
1663 static void fail_all_commands(struct iscsi_conn *conn)
1665 struct iscsi_cmd_task *ctask, *tmp;
1668 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1669 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1671 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1674 /* fail all other running */
1675 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1676 debug_scsi("failing in progress sc %p itt 0x%x\n",
1677 ctask->sc, ctask->itt);
1678 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1684 static void iscsi_start_session_recovery(struct iscsi_session *session,
1685 struct iscsi_conn *conn, int flag)
1689 spin_lock_bh(&session->lock);
1690 if (conn->stop_stage == STOP_CONN_TERM) {
1691 spin_unlock_bh(&session->lock);
1696 * When this is called for the in_login state, we only want to clean
1697 * up the login task and connection. We do not need to block and set
1698 * the recovery state again
1700 if (flag == STOP_CONN_TERM)
1701 session->state = ISCSI_STATE_TERMINATE;
1702 else if (conn->stop_stage != STOP_CONN_RECOVER)
1703 session->state = ISCSI_STATE_IN_RECOVERY;
1705 old_stop_stage = conn->stop_stage;
1706 conn->stop_stage = flag;
1707 conn->c_stage = ISCSI_CONN_STOPPED;
1708 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1709 spin_unlock_bh(&session->lock);
1711 write_lock_bh(conn->recv_lock);
1712 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1713 write_unlock_bh(conn->recv_lock);
1715 mutex_lock(&conn->xmitmutex);
1717 * for connection level recovery we should not calculate
1718 * header digest. conn->hdr_size used for optimization
1719 * in hdr_extract() and will be re-negotiated at
1722 if (flag == STOP_CONN_RECOVER) {
1723 conn->hdrdgst_en = 0;
1724 conn->datadgst_en = 0;
1725 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1726 old_stop_stage != STOP_CONN_RECOVER) {
1727 debug_scsi("blocking session\n");
1728 iscsi_block_session(session_to_cls(session));
1735 spin_lock_bh(&session->lock);
1736 fail_all_commands(conn);
1737 flush_control_queues(session, conn);
1738 spin_unlock_bh(&session->lock);
1740 mutex_unlock(&conn->xmitmutex);
1743 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1745 struct iscsi_conn *conn = cls_conn->dd_data;
1746 struct iscsi_session *session = conn->session;
1749 case STOP_CONN_RECOVER:
1750 case STOP_CONN_TERM:
1751 iscsi_start_session_recovery(session, conn, flag);
1754 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1757 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1759 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1760 struct iscsi_cls_conn *cls_conn, int is_leading)
1762 struct iscsi_session *session = class_to_transport_session(cls_session);
1763 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
1765 /* lookup for existing connection */
1766 spin_lock_bh(&session->lock);
1767 list_for_each_entry(tmp, &session->connections, item) {
1769 if (conn->c_stage != ISCSI_CONN_STOPPED ||
1770 conn->stop_stage == STOP_CONN_TERM) {
1771 printk(KERN_ERR "iscsi: can't bind "
1772 "non-stopped connection (%d:%d)\n",
1773 conn->c_stage, conn->stop_stage);
1774 spin_unlock_bh(&session->lock);
1781 /* bind new iSCSI connection to session */
1782 conn->session = session;
1783 list_add(&conn->item, &session->connections);
1785 spin_unlock_bh(&session->lock);
1788 session->leadconn = conn;
1791 * Unblock xmitworker(), Login Phase will pass through.
1793 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1794 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1797 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1800 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1801 enum iscsi_param param, char *buf, int buflen)
1803 struct iscsi_conn *conn = cls_conn->dd_data;
1804 struct iscsi_session *session = conn->session;
1808 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1809 sscanf(buf, "%d", &conn->max_recv_dlength);
1811 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1812 sscanf(buf, "%d", &conn->max_xmit_dlength);
1814 case ISCSI_PARAM_HDRDGST_EN:
1815 sscanf(buf, "%d", &conn->hdrdgst_en);
1817 case ISCSI_PARAM_DATADGST_EN:
1818 sscanf(buf, "%d", &conn->datadgst_en);
1820 case ISCSI_PARAM_INITIAL_R2T_EN:
1821 sscanf(buf, "%d", &session->initial_r2t_en);
1823 case ISCSI_PARAM_MAX_R2T:
1824 sscanf(buf, "%d", &session->max_r2t);
1826 case ISCSI_PARAM_IMM_DATA_EN:
1827 sscanf(buf, "%d", &session->imm_data_en);
1829 case ISCSI_PARAM_FIRST_BURST:
1830 sscanf(buf, "%d", &session->first_burst);
1832 case ISCSI_PARAM_MAX_BURST:
1833 sscanf(buf, "%d", &session->max_burst);
1835 case ISCSI_PARAM_PDU_INORDER_EN:
1836 sscanf(buf, "%d", &session->pdu_inorder_en);
1838 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1839 sscanf(buf, "%d", &session->dataseq_inorder_en);
1841 case ISCSI_PARAM_ERL:
1842 sscanf(buf, "%d", &session->erl);
1844 case ISCSI_PARAM_IFMARKER_EN:
1845 sscanf(buf, "%d", &value);
1848 case ISCSI_PARAM_OFMARKER_EN:
1849 sscanf(buf, "%d", &value);
1852 case ISCSI_PARAM_EXP_STATSN:
1853 sscanf(buf, "%u", &conn->exp_statsn);
1855 case ISCSI_PARAM_TARGET_NAME:
1856 /* this should not change between logins */
1857 if (session->targetname)
1860 session->targetname = kstrdup(buf, GFP_KERNEL);
1861 if (!session->targetname)
1864 case ISCSI_PARAM_TPGT:
1865 sscanf(buf, "%d", &session->tpgt);
1867 case ISCSI_PARAM_PERSISTENT_PORT:
1868 sscanf(buf, "%d", &conn->persistent_port);
1870 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1872 * this is the address returned in discovery so it should
1873 * not change between logins.
1875 if (conn->persistent_address)
1878 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1879 if (!conn->persistent_address)
1888 EXPORT_SYMBOL_GPL(iscsi_set_param);
1890 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1891 enum iscsi_param param, char *buf)
1893 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1894 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1898 case ISCSI_PARAM_INITIAL_R2T_EN:
1899 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1901 case ISCSI_PARAM_MAX_R2T:
1902 len = sprintf(buf, "%hu\n", session->max_r2t);
1904 case ISCSI_PARAM_IMM_DATA_EN:
1905 len = sprintf(buf, "%d\n", session->imm_data_en);
1907 case ISCSI_PARAM_FIRST_BURST:
1908 len = sprintf(buf, "%u\n", session->first_burst);
1910 case ISCSI_PARAM_MAX_BURST:
1911 len = sprintf(buf, "%u\n", session->max_burst);
1913 case ISCSI_PARAM_PDU_INORDER_EN:
1914 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1916 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1917 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1919 case ISCSI_PARAM_ERL:
1920 len = sprintf(buf, "%d\n", session->erl);
1922 case ISCSI_PARAM_TARGET_NAME:
1923 len = sprintf(buf, "%s\n", session->targetname);
1925 case ISCSI_PARAM_TPGT:
1926 len = sprintf(buf, "%d\n", session->tpgt);
1934 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1936 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1937 enum iscsi_param param, char *buf)
1939 struct iscsi_conn *conn = cls_conn->dd_data;
1943 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1944 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1946 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1947 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1949 case ISCSI_PARAM_HDRDGST_EN:
1950 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1952 case ISCSI_PARAM_DATADGST_EN:
1953 len = sprintf(buf, "%d\n", conn->datadgst_en);
1955 case ISCSI_PARAM_IFMARKER_EN:
1956 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1958 case ISCSI_PARAM_OFMARKER_EN:
1959 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1961 case ISCSI_PARAM_EXP_STATSN:
1962 len = sprintf(buf, "%u\n", conn->exp_statsn);
1964 case ISCSI_PARAM_PERSISTENT_PORT:
1965 len = sprintf(buf, "%d\n", conn->persistent_port);
1967 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1968 len = sprintf(buf, "%s\n", conn->persistent_address);
1976 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1978 MODULE_AUTHOR("Mike Christie");
1979 MODULE_DESCRIPTION("iSCSI library functions");
1980 MODULE_LICENSE("GPL");