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/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <linux/slab.h>
29 #include <linux/module.h>
30 #include <asm/unaligned.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi_host.h>
37 #include <scsi/scsi.h>
38 #include <scsi/iscsi_proto.h>
39 #include <scsi/scsi_transport.h>
40 #include <scsi/scsi_transport_iscsi.h>
41 #include <scsi/libiscsi.h>
43 static int iscsi_dbg_lib_conn;
44 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
46 MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
50 static int iscsi_dbg_lib_session;
51 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
53 MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
57 static int iscsi_dbg_lib_eh;
58 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
60 MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
64 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
66 if (iscsi_dbg_lib_conn) \
67 iscsi_conn_printk(KERN_INFO, _conn, \
72 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
74 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
80 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
82 if (iscsi_dbg_lib_eh) \
83 iscsi_session_printk(KERN_INFO, _session, \
88 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
94 queue_work(ihost->workq, &conn->xmitwork);
96 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
98 static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
110 session->exp_cmdsn = exp_cmdsn;
112 if (max_cmdsn != session->max_cmdsn &&
113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
114 session->max_cmdsn = max_cmdsn;
116 * if the window closed with IO queued, then kick the
119 if (!list_empty(&session->leadconn->cmdqueue) ||
120 !list_empty(&session->leadconn->mgmtqueue))
121 iscsi_conn_queue_work(session->leadconn);
125 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
127 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
128 be32_to_cpu(hdr->max_cmdsn));
130 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
133 * iscsi_prep_data_out_pdu - initialize Data-Out
134 * @task: scsi command task
136 * @hdr: iscsi data in pdu
139 * Initialize Data-Out within this R2T sequence and finds
140 * proper data_offset within this SCSI command.
142 * This function is called with connection lock taken.
144 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
145 struct iscsi_data *hdr)
147 struct iscsi_conn *conn = task->conn;
148 unsigned int left = r2t->data_length - r2t->sent;
150 task->hdr_len = sizeof(struct iscsi_data);
152 memset(hdr, 0, sizeof(struct iscsi_data));
154 hdr->datasn = cpu_to_be32(r2t->datasn);
156 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
157 hdr->lun = task->lun;
158 hdr->itt = task->hdr_itt;
159 hdr->exp_statsn = r2t->exp_statsn;
160 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
161 if (left > conn->max_xmit_dlength) {
162 hton24(hdr->dlength, conn->max_xmit_dlength);
163 r2t->data_count = conn->max_xmit_dlength;
166 hton24(hdr->dlength, left);
167 r2t->data_count = left;
168 hdr->flags = ISCSI_FLAG_CMD_FINAL;
170 conn->dataout_pdus_cnt++;
172 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
174 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
176 unsigned exp_len = task->hdr_len + len;
178 if (exp_len > task->hdr_max) {
183 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
184 task->hdr_len = exp_len;
189 * make an extended cdb AHS
191 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
193 struct scsi_cmnd *cmd = task->sc;
194 unsigned rlen, pad_len;
195 unsigned short ahslength;
196 struct iscsi_ecdb_ahdr *ecdb_ahdr;
199 ecdb_ahdr = iscsi_next_hdr(task);
200 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
202 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
203 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
205 pad_len = iscsi_padding(rlen);
207 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
208 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
213 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
215 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
216 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
217 ecdb_ahdr->reserved = 0;
218 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
220 ISCSI_DBG_SESSION(task->conn->session,
221 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
222 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
223 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
228 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
230 struct scsi_cmnd *sc = task->sc;
231 struct iscsi_rlength_ahdr *rlen_ahdr;
234 rlen_ahdr = iscsi_next_hdr(task);
235 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
239 rlen_ahdr->ahslength =
240 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
241 sizeof(rlen_ahdr->reserved));
242 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
243 rlen_ahdr->reserved = 0;
244 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
246 ISCSI_DBG_SESSION(task->conn->session,
247 "bidi-in rlen_ahdr->read_length(%d) "
248 "rlen_ahdr->ahslength(%d)\n",
249 be32_to_cpu(rlen_ahdr->read_length),
250 be16_to_cpu(rlen_ahdr->ahslength));
255 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
257 * @opcode: opcode to check for
259 * During TMF a task has to be checked if it's affected.
260 * All unrelated I/O can be passed through, but I/O to the
261 * affected LUN should be restricted.
262 * If 'fast_abort' is set we won't be sending any I/O to the
264 * Otherwise the target is waiting for all TTTs to be completed,
265 * so we have to send all outstanding Data-Out PDUs to the target.
267 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
269 struct iscsi_conn *conn = task->conn;
270 struct iscsi_tm *tmf = &conn->tmhdr;
271 unsigned int hdr_lun;
273 if (conn->tmf_state == TMF_INITIAL)
276 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
279 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
280 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
282 * Allow PDUs for unrelated LUNs
284 hdr_lun = scsilun_to_int(&tmf->lun);
285 if (hdr_lun != task->sc->device->lun)
288 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
290 * Fail all SCSI cmd PDUs
292 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
293 iscsi_conn_printk(KERN_INFO, conn,
294 "task [op %x/%x itt "
297 task->hdr->opcode, opcode,
298 task->itt, task->hdr_itt);
302 * And also all data-out PDUs in response to R2T
303 * if fast_abort is set.
305 if (conn->session->fast_abort) {
306 iscsi_conn_printk(KERN_INFO, conn,
307 "task [op %x/%x itt "
308 "0x%x/0x%x] fast abort.\n",
309 task->hdr->opcode, opcode,
310 task->itt, task->hdr_itt);
314 case ISCSI_TM_FUNC_ABORT_TASK:
316 * the caller has already checked if the task
317 * they want to abort was in the pending queue so if
318 * we are here the cmd pdu has gone out already, and
319 * we will only hit this for data-outs
321 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
322 task->hdr_itt == tmf->rtt) {
323 ISCSI_DBG_SESSION(conn->session,
324 "Preventing task %x/%x from sending "
325 "data-out due to abort task in "
326 "progress\n", task->itt,
337 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
340 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
341 * fields like dlength or final based on how much data it sends
343 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
345 struct iscsi_conn *conn = task->conn;
346 struct iscsi_session *session = conn->session;
347 struct scsi_cmnd *sc = task->sc;
348 struct iscsi_scsi_req *hdr;
349 unsigned hdrlength, cmd_len;
353 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
357 if (conn->session->tt->alloc_pdu) {
358 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
362 hdr = (struct iscsi_scsi_req *)task->hdr;
364 memset(hdr, 0, sizeof(*hdr));
366 if (session->tt->parse_pdu_itt)
367 hdr->itt = task->hdr_itt = itt;
369 hdr->itt = task->hdr_itt = build_itt(task->itt,
370 task->conn->session->age);
372 rc = iscsi_add_hdr(task, sizeof(*hdr));
375 hdr->opcode = ISCSI_OP_SCSI_CMD;
376 hdr->flags = ISCSI_ATTR_SIMPLE;
377 int_to_scsilun(sc->device->lun, &hdr->lun);
378 task->lun = hdr->lun;
379 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
380 cmd_len = sc->cmd_len;
381 if (cmd_len < ISCSI_CDB_SIZE)
382 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
383 else if (cmd_len > ISCSI_CDB_SIZE) {
384 rc = iscsi_prep_ecdb_ahs(task);
387 cmd_len = ISCSI_CDB_SIZE;
389 memcpy(hdr->cdb, sc->cmnd, cmd_len);
392 if (scsi_bidi_cmnd(sc)) {
393 hdr->flags |= ISCSI_FLAG_CMD_READ;
394 rc = iscsi_prep_bidi_ahs(task);
398 if (sc->sc_data_direction == DMA_TO_DEVICE) {
399 unsigned out_len = scsi_out(sc)->length;
400 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
402 hdr->data_length = cpu_to_be32(out_len);
403 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
407 * imm_count bytes to be sent right after
410 * unsol_count bytes(as Data-Out) to be sent
411 * without R2T ack right after
414 * r2t data_length bytes to be sent via R2T ack's
416 * pad_count bytes to be sent as zero-padding
418 memset(r2t, 0, sizeof(*r2t));
420 if (session->imm_data_en) {
421 if (out_len >= session->first_burst)
422 task->imm_count = min(session->first_burst,
423 conn->max_xmit_dlength);
425 task->imm_count = min(out_len,
426 conn->max_xmit_dlength);
427 hton24(hdr->dlength, task->imm_count);
429 zero_data(hdr->dlength);
431 if (!session->initial_r2t_en) {
432 r2t->data_length = min(session->first_burst, out_len) -
434 r2t->data_offset = task->imm_count;
435 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
436 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
439 if (!task->unsol_r2t.data_length)
440 /* No unsolicit Data-Out's */
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
443 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
444 zero_data(hdr->dlength);
445 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
447 if (sc->sc_data_direction == DMA_FROM_DEVICE)
448 hdr->flags |= ISCSI_FLAG_CMD_READ;
451 /* calculate size of additional header segments (AHSs) */
452 hdrlength = task->hdr_len - sizeof(*hdr);
454 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
455 hdrlength /= ISCSI_PAD_LEN;
457 WARN_ON(hdrlength >= 256);
458 hdr->hlength = hdrlength & 0xFF;
459 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
461 if (session->tt->init_task && session->tt->init_task(task))
464 task->state = ISCSI_TASK_RUNNING;
467 conn->scsicmd_pdus_cnt++;
468 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
469 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
470 scsi_bidi_cmnd(sc) ? "bidirectional" :
471 sc->sc_data_direction == DMA_TO_DEVICE ?
472 "write" : "read", conn->id, sc, sc->cmnd[0],
473 task->itt, scsi_bufflen(sc),
474 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
476 session->max_cmdsn - session->exp_cmdsn + 1);
481 * iscsi_free_task - free a task
482 * @task: iscsi cmd task
484 * Must be called with session lock.
485 * This function returns the scsi command to scsi-ml or cleans
486 * up mgmt tasks then returns the task to the pool.
488 static void iscsi_free_task(struct iscsi_task *task)
490 struct iscsi_conn *conn = task->conn;
491 struct iscsi_session *session = conn->session;
492 struct scsi_cmnd *sc = task->sc;
493 int oldstate = task->state;
495 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
496 task->itt, task->state, task->sc);
498 session->tt->cleanup_task(task);
499 task->state = ISCSI_TASK_FREE;
502 * login task is preallocated so do not free
504 if (conn->login_task == task)
507 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
511 /* SCSI eh reuses commands to verify us */
514 * queue command may call this to free the task, so
515 * it will decide how to return sc to scsi-ml.
517 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
522 void __iscsi_get_task(struct iscsi_task *task)
524 atomic_inc(&task->refcount);
526 EXPORT_SYMBOL_GPL(__iscsi_get_task);
528 void __iscsi_put_task(struct iscsi_task *task)
530 if (atomic_dec_and_test(&task->refcount))
531 iscsi_free_task(task);
533 EXPORT_SYMBOL_GPL(__iscsi_put_task);
535 void iscsi_put_task(struct iscsi_task *task)
537 struct iscsi_session *session = task->conn->session;
539 spin_lock_bh(&session->lock);
540 __iscsi_put_task(task);
541 spin_unlock_bh(&session->lock);
543 EXPORT_SYMBOL_GPL(iscsi_put_task);
546 * iscsi_complete_task - finish a task
547 * @task: iscsi cmd task
548 * @state: state to complete task with
550 * Must be called with session lock.
552 static void iscsi_complete_task(struct iscsi_task *task, int state)
554 struct iscsi_conn *conn = task->conn;
556 ISCSI_DBG_SESSION(conn->session,
557 "complete task itt 0x%x state %d sc %p\n",
558 task->itt, task->state, task->sc);
559 if (task->state == ISCSI_TASK_COMPLETED ||
560 task->state == ISCSI_TASK_ABRT_TMF ||
561 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
562 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
564 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
567 if (!list_empty(&task->running))
568 list_del_init(&task->running);
570 if (conn->task == task)
573 if (conn->ping_task == task)
574 conn->ping_task = NULL;
576 /* release get from queueing */
577 __iscsi_put_task(task);
581 * iscsi_complete_scsi_task - finish scsi task normally
582 * @task: iscsi task for scsi cmd
583 * @exp_cmdsn: expected cmd sn in cpu format
584 * @max_cmdsn: max cmd sn in cpu format
586 * This is used when drivers do not need or cannot perform
587 * lower level pdu processing.
589 * Called with session lock
591 void iscsi_complete_scsi_task(struct iscsi_task *task,
592 uint32_t exp_cmdsn, uint32_t max_cmdsn)
594 struct iscsi_conn *conn = task->conn;
596 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
598 conn->last_recv = jiffies;
599 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
600 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
602 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
606 * session lock must be held and if not called for a task that is
607 * still pending or from the xmit thread, then xmit thread must
610 static void fail_scsi_task(struct iscsi_task *task, int err)
612 struct iscsi_conn *conn = task->conn;
613 struct scsi_cmnd *sc;
617 * if a command completes and we get a successful tmf response
618 * we will hit this because the scsi eh abort code does not take
625 if (task->state == ISCSI_TASK_PENDING) {
627 * cmd never made it to the xmit thread, so we should not count
628 * the cmd in the sequencing
630 conn->session->queued_cmdsn--;
631 /* it was never sent so just complete like normal */
632 state = ISCSI_TASK_COMPLETED;
633 } else if (err == DID_TRANSPORT_DISRUPTED)
634 state = ISCSI_TASK_ABRT_SESS_RECOV;
636 state = ISCSI_TASK_ABRT_TMF;
638 sc->result = err << 16;
639 if (!scsi_bidi_cmnd(sc))
640 scsi_set_resid(sc, scsi_bufflen(sc));
642 scsi_out(sc)->resid = scsi_out(sc)->length;
643 scsi_in(sc)->resid = scsi_in(sc)->length;
646 iscsi_complete_task(task, state);
649 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
650 struct iscsi_task *task)
652 struct iscsi_session *session = conn->session;
653 struct iscsi_hdr *hdr = task->hdr;
654 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
655 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
657 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
660 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
661 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
663 * pre-format CmdSN for outgoing PDU.
665 nop->cmdsn = cpu_to_be32(session->cmdsn);
666 if (hdr->itt != RESERVED_ITT) {
668 * TODO: We always use immediate for normal session pdus.
669 * If we start to send tmfs or nops as non-immediate then
670 * we should start checking the cmdsn numbers for mgmt tasks.
672 * During discovery sessions iscsid sends TEXT as non immediate,
673 * but we always only send one PDU at a time.
675 if (conn->c_stage == ISCSI_CONN_STARTED &&
676 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
677 session->queued_cmdsn++;
682 if (session->tt->init_task && session->tt->init_task(task))
685 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
686 session->state = ISCSI_STATE_LOGGING_OUT;
688 task->state = ISCSI_TASK_RUNNING;
689 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
690 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
691 hdr->itt, task->data_count);
695 static struct iscsi_task *
696 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
697 char *data, uint32_t data_size)
699 struct iscsi_session *session = conn->session;
700 struct iscsi_host *ihost = shost_priv(session->host);
701 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
702 struct iscsi_task *task;
705 if (session->state == ISCSI_STATE_TERMINATE)
708 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
710 * Login and Text are sent serially, in
711 * request-followed-by-response sequence.
712 * Same task can be used. Same ITT must be used.
713 * Note that login_task is preallocated at conn_create().
715 if (conn->login_task->state != ISCSI_TASK_FREE) {
716 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
717 "progress. Cannot start new task.\n");
721 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
722 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
726 task = conn->login_task;
728 if (session->state != ISCSI_STATE_LOGGED_IN)
731 if (data_size != 0) {
732 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
736 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
737 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
739 if (!kfifo_out(&session->cmdpool.queue,
740 (void*)&task, sizeof(void*)))
744 * released in complete pdu for task we expect a response for, and
745 * released by the lld when it has transmitted the task for
746 * pdus we do not expect a response for.
748 atomic_set(&task->refcount, 1);
751 INIT_LIST_HEAD(&task->running);
752 task->state = ISCSI_TASK_PENDING;
755 memcpy(task->data, data, data_size);
756 task->data_count = data_size;
758 task->data_count = 0;
760 if (conn->session->tt->alloc_pdu) {
761 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
762 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
763 "pdu for mgmt task.\n");
768 itt = task->hdr->itt;
769 task->hdr_len = sizeof(struct iscsi_hdr);
770 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
772 if (hdr->itt != RESERVED_ITT) {
773 if (session->tt->parse_pdu_itt)
774 task->hdr->itt = itt;
776 task->hdr->itt = build_itt(task->itt,
777 task->conn->session->age);
781 if (iscsi_prep_mgmt_task(conn, task))
784 if (session->tt->xmit_task(task))
787 list_add_tail(&task->running, &conn->mgmtqueue);
788 iscsi_conn_queue_work(conn);
794 __iscsi_put_task(task);
798 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
799 char *data, uint32_t data_size)
801 struct iscsi_conn *conn = cls_conn->dd_data;
802 struct iscsi_session *session = conn->session;
805 spin_lock_bh(&session->lock);
806 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
808 spin_unlock_bh(&session->lock);
811 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
814 * iscsi_cmd_rsp - SCSI Command Response processing
815 * @conn: iscsi connection
817 * @task: scsi command task
818 * @data: cmd data buffer
819 * @datalen: len of buffer
821 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
822 * then completes the command and task.
824 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
825 struct iscsi_task *task, char *data,
828 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
829 struct iscsi_session *session = conn->session;
830 struct scsi_cmnd *sc = task->sc;
832 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
833 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
835 sc->result = (DID_OK << 16) | rhdr->cmd_status;
837 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
838 sc->result = DID_ERROR << 16;
842 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
847 iscsi_conn_printk(KERN_ERR, conn,
848 "Got CHECK_CONDITION but invalid data "
849 "buffer size of %d\n", datalen);
850 sc->result = DID_BAD_TARGET << 16;
854 senselen = get_unaligned_be16(data);
855 if (datalen < senselen)
856 goto invalid_datalen;
858 memcpy(sc->sense_buffer, data + 2,
859 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
860 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
861 min_t(uint16_t, senselen,
862 SCSI_SENSE_BUFFERSIZE));
865 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
866 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
867 int res_count = be32_to_cpu(rhdr->bi_residual_count);
869 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
870 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
871 res_count <= scsi_in(sc)->length))
872 scsi_in(sc)->resid = res_count;
874 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
877 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
878 ISCSI_FLAG_CMD_OVERFLOW)) {
879 int res_count = be32_to_cpu(rhdr->residual_count);
882 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
883 res_count <= scsi_bufflen(sc)))
884 /* write side for bidi or uni-io set_resid */
885 scsi_set_resid(sc, res_count);
887 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
890 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
891 sc, sc->result, task->itt);
892 conn->scsirsp_pdus_cnt++;
893 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
897 * iscsi_data_in_rsp - SCSI Data-In Response processing
898 * @conn: iscsi connection
900 * @task: scsi command task
903 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
904 struct iscsi_task *task)
906 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
907 struct scsi_cmnd *sc = task->sc;
909 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
912 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
913 sc->result = (DID_OK << 16) | rhdr->cmd_status;
914 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
915 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
916 ISCSI_FLAG_DATA_OVERFLOW)) {
917 int res_count = be32_to_cpu(rhdr->residual_count);
920 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
921 res_count <= scsi_in(sc)->length))
922 scsi_in(sc)->resid = res_count;
924 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
927 ISCSI_DBG_SESSION(conn->session, "data in with status done "
928 "[sc %p res %d itt 0x%x]\n",
929 sc, sc->result, task->itt);
930 conn->scsirsp_pdus_cnt++;
931 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
934 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
936 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
938 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
939 conn->tmfrsp_pdus_cnt++;
941 if (conn->tmf_state != TMF_QUEUED)
944 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
945 conn->tmf_state = TMF_SUCCESS;
946 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
947 conn->tmf_state = TMF_NOT_FOUND;
949 conn->tmf_state = TMF_FAILED;
950 wake_up(&conn->ehwait);
953 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
955 struct iscsi_nopout hdr;
956 struct iscsi_task *task;
958 if (!rhdr && conn->ping_task)
961 memset(&hdr, 0, sizeof(struct iscsi_nopout));
962 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
963 hdr.flags = ISCSI_FLAG_CMD_FINAL;
968 hdr.itt = RESERVED_ITT;
970 hdr.ttt = RESERVED_ITT;
972 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
974 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
976 /* only track our nops */
977 conn->ping_task = task;
978 conn->last_ping = jiffies;
982 static int iscsi_nop_out_rsp(struct iscsi_task *task,
983 struct iscsi_nopin *nop, char *data, int datalen)
985 struct iscsi_conn *conn = task->conn;
988 if (conn->ping_task != task) {
990 * If this is not in response to one of our
991 * nops then it must be from userspace.
993 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
995 rc = ISCSI_ERR_CONN_FAILED;
997 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
998 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1002 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1003 char *data, int datalen)
1005 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1006 struct iscsi_hdr rejected_pdu;
1009 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1011 if (ntoh24(reject->dlength) > datalen ||
1012 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1013 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1014 "pdu. Invalid data length (pdu dlength "
1015 "%u, datalen %d\n", ntoh24(reject->dlength),
1017 return ISCSI_ERR_PROTO;
1019 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1020 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1022 switch (reject->reason) {
1023 case ISCSI_REASON_DATA_DIGEST_ERROR:
1024 iscsi_conn_printk(KERN_ERR, conn,
1025 "pdu (op 0x%x itt 0x%x) rejected "
1026 "due to DataDigest error.\n",
1027 rejected_pdu.itt, opcode);
1029 case ISCSI_REASON_IMM_CMD_REJECT:
1030 iscsi_conn_printk(KERN_ERR, conn,
1031 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1032 "immediate commands.\n",
1033 rejected_pdu.itt, opcode);
1035 * We only send one TMF at a time so if the target could not
1036 * handle it, then it should get fixed (RFC mandates that
1037 * a target can handle one immediate TMF per conn).
1039 * For nops-outs, we could have sent more than one if
1040 * the target is sending us lots of nop-ins
1042 if (opcode != ISCSI_OP_NOOP_OUT)
1045 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1047 * nop-out in response to target's nop-out rejected.
1050 iscsi_send_nopout(conn,
1051 (struct iscsi_nopin*)&rejected_pdu);
1053 struct iscsi_task *task;
1055 * Our nop as ping got dropped. We know the target
1056 * and transport are ok so just clean up
1058 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "Invalid pdu reject. Could "
1062 "not lookup rejected task.\n");
1063 rc = ISCSI_ERR_BAD_ITT;
1065 rc = iscsi_nop_out_rsp(task,
1066 (struct iscsi_nopin*)&rejected_pdu,
1071 iscsi_conn_printk(KERN_ERR, conn,
1072 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1073 "code 0x%x\n", rejected_pdu.itt,
1074 rejected_pdu.opcode, reject->reason);
1081 * iscsi_itt_to_task - look up task by itt
1082 * @conn: iscsi connection
1085 * This should be used for mgmt tasks like login and nops, or if
1086 * the LDD's itt space does not include the session age.
1088 * The session lock must be held.
1090 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1092 struct iscsi_session *session = conn->session;
1095 if (itt == RESERVED_ITT)
1098 if (session->tt->parse_pdu_itt)
1099 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1102 if (i >= session->cmds_max)
1105 return session->cmds[i];
1107 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1110 * __iscsi_complete_pdu - complete pdu
1112 * @hdr: iscsi header
1113 * @data: data buffer
1114 * @datalen: len of data buffer
1116 * Completes pdu processing by freeing any resources allocated at
1117 * queuecommand or send generic. session lock must be held and verify
1118 * itt must have been called.
1120 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1121 char *data, int datalen)
1123 struct iscsi_session *session = conn->session;
1124 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1125 struct iscsi_task *task;
1128 conn->last_recv = jiffies;
1129 rc = iscsi_verify_itt(conn, hdr->itt);
1133 if (hdr->itt != RESERVED_ITT)
1134 itt = get_itt(hdr->itt);
1138 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1139 opcode, conn->id, itt, datalen);
1142 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1145 case ISCSI_OP_NOOP_IN:
1147 rc = ISCSI_ERR_PROTO;
1151 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1154 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1156 case ISCSI_OP_REJECT:
1157 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1159 case ISCSI_OP_ASYNC_EVENT:
1160 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1161 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1162 rc = ISCSI_ERR_CONN_FAILED;
1165 rc = ISCSI_ERR_BAD_OPCODE;
1172 case ISCSI_OP_SCSI_CMD_RSP:
1173 case ISCSI_OP_SCSI_DATA_IN:
1174 task = iscsi_itt_to_ctask(conn, hdr->itt);
1176 return ISCSI_ERR_BAD_ITT;
1177 task->last_xfer = jiffies;
1181 * LLD handles R2Ts if they need to.
1184 case ISCSI_OP_LOGOUT_RSP:
1185 case ISCSI_OP_LOGIN_RSP:
1186 case ISCSI_OP_TEXT_RSP:
1187 case ISCSI_OP_SCSI_TMFUNC_RSP:
1188 case ISCSI_OP_NOOP_IN:
1189 task = iscsi_itt_to_task(conn, hdr->itt);
1191 return ISCSI_ERR_BAD_ITT;
1194 return ISCSI_ERR_BAD_OPCODE;
1198 case ISCSI_OP_SCSI_CMD_RSP:
1199 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1201 case ISCSI_OP_SCSI_DATA_IN:
1202 iscsi_data_in_rsp(conn, hdr, task);
1204 case ISCSI_OP_LOGOUT_RSP:
1205 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1207 rc = ISCSI_ERR_PROTO;
1210 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1212 case ISCSI_OP_LOGIN_RSP:
1213 case ISCSI_OP_TEXT_RSP:
1214 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1216 * login related PDU's exp_statsn is handled in
1220 case ISCSI_OP_SCSI_TMFUNC_RSP:
1221 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1223 rc = ISCSI_ERR_PROTO;
1227 iscsi_tmf_rsp(conn, hdr);
1228 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1230 case ISCSI_OP_NOOP_IN:
1231 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1232 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1233 rc = ISCSI_ERR_PROTO;
1236 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1238 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1242 rc = ISCSI_ERR_BAD_OPCODE;
1249 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1250 rc = ISCSI_ERR_CONN_FAILED;
1251 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1254 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1256 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1257 char *data, int datalen)
1261 spin_lock(&conn->session->lock);
1262 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1263 spin_unlock(&conn->session->lock);
1266 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1268 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1270 struct iscsi_session *session = conn->session;
1273 if (itt == RESERVED_ITT)
1276 if (session->tt->parse_pdu_itt)
1277 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1280 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1283 if (age != session->age) {
1284 iscsi_conn_printk(KERN_ERR, conn,
1285 "received itt %x expected session age (%x)\n",
1286 (__force u32)itt, session->age);
1287 return ISCSI_ERR_BAD_ITT;
1290 if (i >= session->cmds_max) {
1291 iscsi_conn_printk(KERN_ERR, conn,
1292 "received invalid itt index %u (max cmds "
1293 "%u.\n", i, session->cmds_max);
1294 return ISCSI_ERR_BAD_ITT;
1298 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1301 * iscsi_itt_to_ctask - look up ctask by itt
1302 * @conn: iscsi connection
1305 * This should be used for cmd tasks.
1307 * The session lock must be held.
1309 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1311 struct iscsi_task *task;
1313 if (iscsi_verify_itt(conn, itt))
1316 task = iscsi_itt_to_task(conn, itt);
1317 if (!task || !task->sc)
1320 if (task->sc->SCp.phase != conn->session->age) {
1321 iscsi_session_printk(KERN_ERR, conn->session,
1322 "task's session age %d, expected %d\n",
1323 task->sc->SCp.phase, conn->session->age);
1329 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1331 void iscsi_session_failure(struct iscsi_session *session,
1334 struct iscsi_conn *conn;
1337 spin_lock_bh(&session->lock);
1338 conn = session->leadconn;
1339 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1340 spin_unlock_bh(&session->lock);
1344 dev = get_device(&conn->cls_conn->dev);
1345 spin_unlock_bh(&session->lock);
1349 * if the host is being removed bypass the connection
1350 * recovery initialization because we are going to kill
1353 if (err == ISCSI_ERR_INVALID_HOST)
1354 iscsi_conn_error_event(conn->cls_conn, err);
1356 iscsi_conn_failure(conn, err);
1359 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1361 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1363 struct iscsi_session *session = conn->session;
1365 spin_lock_bh(&session->lock);
1366 if (session->state == ISCSI_STATE_FAILED) {
1367 spin_unlock_bh(&session->lock);
1371 if (conn->stop_stage == 0)
1372 session->state = ISCSI_STATE_FAILED;
1373 spin_unlock_bh(&session->lock);
1375 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1376 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1377 iscsi_conn_error_event(conn->cls_conn, err);
1379 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1381 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1383 struct iscsi_session *session = conn->session;
1386 * Check for iSCSI window and take care of CmdSN wrap-around
1388 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1389 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1390 "%u MaxCmdSN %u CmdSN %u/%u\n",
1391 session->exp_cmdsn, session->max_cmdsn,
1392 session->cmdsn, session->queued_cmdsn);
1398 static int iscsi_xmit_task(struct iscsi_conn *conn)
1400 struct iscsi_task *task = conn->task;
1403 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1406 __iscsi_get_task(task);
1407 spin_unlock_bh(&conn->session->lock);
1408 rc = conn->session->tt->xmit_task(task);
1409 spin_lock_bh(&conn->session->lock);
1411 /* done with this task */
1412 task->last_xfer = jiffies;
1415 __iscsi_put_task(task);
1420 * iscsi_requeue_task - requeue task to run from session workqueue
1421 * @task: task to requeue
1423 * LLDs that need to run a task from the session workqueue should call
1424 * this. The session lock must be held. This should only be called
1425 * by software drivers.
1427 void iscsi_requeue_task(struct iscsi_task *task)
1429 struct iscsi_conn *conn = task->conn;
1432 * this may be on the requeue list already if the xmit_task callout
1433 * is handling the r2ts while we are adding new ones
1435 if (list_empty(&task->running))
1436 list_add_tail(&task->running, &conn->requeue);
1437 iscsi_conn_queue_work(conn);
1439 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1442 * iscsi_data_xmit - xmit any command into the scheduled connection
1443 * @conn: iscsi connection
1446 * The function can return -EAGAIN in which case the caller must
1447 * re-schedule it again later or recover. '0' return code means
1450 static int iscsi_data_xmit(struct iscsi_conn *conn)
1452 struct iscsi_task *task;
1455 spin_lock_bh(&conn->session->lock);
1456 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1457 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1458 spin_unlock_bh(&conn->session->lock);
1463 rc = iscsi_xmit_task(conn);
1469 * process mgmt pdus like nops before commands since we should
1470 * only have one nop-out as a ping from us and targets should not
1471 * overflow us with nop-ins
1474 while (!list_empty(&conn->mgmtqueue)) {
1475 conn->task = list_entry(conn->mgmtqueue.next,
1476 struct iscsi_task, running);
1477 list_del_init(&conn->task->running);
1478 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1479 __iscsi_put_task(conn->task);
1483 rc = iscsi_xmit_task(conn);
1488 /* process pending command queue */
1489 while (!list_empty(&conn->cmdqueue)) {
1490 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1492 list_del_init(&conn->task->running);
1493 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1494 fail_scsi_task(conn->task, DID_IMM_RETRY);
1497 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1499 if (rc == -ENOMEM || rc == -EACCES) {
1500 list_add_tail(&conn->task->running,
1505 fail_scsi_task(conn->task, DID_ABORT);
1508 rc = iscsi_xmit_task(conn);
1512 * we could continuously get new task requests so
1513 * we need to check the mgmt queue for nops that need to
1514 * be sent to aviod starvation
1516 if (!list_empty(&conn->mgmtqueue))
1520 while (!list_empty(&conn->requeue)) {
1522 * we always do fastlogout - conn stop code will clean up.
1524 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1527 task = list_entry(conn->requeue.next, struct iscsi_task,
1529 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1533 list_del_init(&conn->task->running);
1534 conn->task->state = ISCSI_TASK_RUNNING;
1535 rc = iscsi_xmit_task(conn);
1538 if (!list_empty(&conn->mgmtqueue))
1541 spin_unlock_bh(&conn->session->lock);
1545 spin_unlock_bh(&conn->session->lock);
1549 static void iscsi_xmitworker(struct work_struct *work)
1551 struct iscsi_conn *conn =
1552 container_of(work, struct iscsi_conn, xmitwork);
1555 * serialize Xmit worker on a per-connection basis.
1558 rc = iscsi_data_xmit(conn);
1559 } while (rc >= 0 || rc == -EAGAIN);
1562 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1563 struct scsi_cmnd *sc)
1565 struct iscsi_task *task;
1567 if (!kfifo_out(&conn->session->cmdpool.queue,
1568 (void *) &task, sizeof(void *)))
1571 sc->SCp.phase = conn->session->age;
1572 sc->SCp.ptr = (char *) task;
1574 atomic_set(&task->refcount, 1);
1575 task->state = ISCSI_TASK_PENDING;
1578 task->have_checked_conn = false;
1579 task->last_timeout = jiffies;
1580 task->last_xfer = jiffies;
1581 INIT_LIST_HEAD(&task->running);
1586 FAILURE_BAD_HOST = 1,
1587 FAILURE_SESSION_FAILED,
1588 FAILURE_SESSION_FREED,
1589 FAILURE_WINDOW_CLOSED,
1591 FAILURE_SESSION_TERMINATE,
1592 FAILURE_SESSION_IN_RECOVERY,
1593 FAILURE_SESSION_RECOVERY_TIMEOUT,
1594 FAILURE_SESSION_LOGGING_OUT,
1595 FAILURE_SESSION_NOT_READY,
1598 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1600 struct iscsi_cls_session *cls_session;
1601 struct iscsi_host *ihost;
1603 struct iscsi_session *session;
1604 struct iscsi_conn *conn;
1605 struct iscsi_task *task = NULL;
1610 ihost = shost_priv(host);
1612 cls_session = starget_to_session(scsi_target(sc->device));
1613 session = cls_session->dd_data;
1614 spin_lock_bh(&session->lock);
1616 reason = iscsi_session_chkready(cls_session);
1618 sc->result = reason;
1622 if (session->state != ISCSI_STATE_LOGGED_IN) {
1624 * to handle the race between when we set the recovery state
1625 * and block the session we requeue here (commands could
1626 * be entering our queuecommand while a block is starting
1627 * up because the block code is not locked)
1629 switch (session->state) {
1630 case ISCSI_STATE_FAILED:
1631 case ISCSI_STATE_IN_RECOVERY:
1632 reason = FAILURE_SESSION_IN_RECOVERY;
1633 sc->result = DID_IMM_RETRY << 16;
1635 case ISCSI_STATE_LOGGING_OUT:
1636 reason = FAILURE_SESSION_LOGGING_OUT;
1637 sc->result = DID_IMM_RETRY << 16;
1639 case ISCSI_STATE_RECOVERY_FAILED:
1640 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1641 sc->result = DID_TRANSPORT_FAILFAST << 16;
1643 case ISCSI_STATE_TERMINATE:
1644 reason = FAILURE_SESSION_TERMINATE;
1645 sc->result = DID_NO_CONNECT << 16;
1648 reason = FAILURE_SESSION_FREED;
1649 sc->result = DID_NO_CONNECT << 16;
1654 conn = session->leadconn;
1656 reason = FAILURE_SESSION_FREED;
1657 sc->result = DID_NO_CONNECT << 16;
1661 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1662 reason = FAILURE_SESSION_IN_RECOVERY;
1663 sc->result = DID_REQUEUE << 16;
1667 if (iscsi_check_cmdsn_window_closed(conn)) {
1668 reason = FAILURE_WINDOW_CLOSED;
1672 task = iscsi_alloc_task(conn, sc);
1674 reason = FAILURE_OOM;
1678 if (!ihost->workq) {
1679 reason = iscsi_prep_scsi_cmd_pdu(task);
1681 if (reason == -ENOMEM || reason == -EACCES) {
1682 reason = FAILURE_OOM;
1685 sc->result = DID_ABORT << 16;
1689 if (session->tt->xmit_task(task)) {
1691 reason = FAILURE_SESSION_NOT_READY;
1695 list_add_tail(&task->running, &conn->cmdqueue);
1696 iscsi_conn_queue_work(conn);
1699 session->queued_cmdsn++;
1700 spin_unlock_bh(&session->lock);
1704 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1706 spin_unlock_bh(&session->lock);
1707 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1708 sc->cmnd[0], reason);
1709 return SCSI_MLQUEUE_TARGET_BUSY;
1712 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1714 spin_unlock_bh(&session->lock);
1715 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1716 sc->cmnd[0], reason);
1717 if (!scsi_bidi_cmnd(sc))
1718 scsi_set_resid(sc, scsi_bufflen(sc));
1720 scsi_out(sc)->resid = scsi_out(sc)->length;
1721 scsi_in(sc)->resid = scsi_in(sc)->length;
1726 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1728 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
1731 case SCSI_QDEPTH_DEFAULT:
1732 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1734 case SCSI_QDEPTH_QFULL:
1735 scsi_track_queue_full(sdev, depth);
1737 case SCSI_QDEPTH_RAMP_UP:
1738 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1743 return sdev->queue_depth;
1745 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1747 int iscsi_target_alloc(struct scsi_target *starget)
1749 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1750 struct iscsi_session *session = cls_session->dd_data;
1752 starget->can_queue = session->scsi_cmds_max;
1755 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1757 static void iscsi_tmf_timedout(unsigned long data)
1759 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1760 struct iscsi_session *session = conn->session;
1762 spin_lock(&session->lock);
1763 if (conn->tmf_state == TMF_QUEUED) {
1764 conn->tmf_state = TMF_TIMEDOUT;
1765 ISCSI_DBG_EH(session, "tmf timedout\n");
1766 /* unblock eh_abort() */
1767 wake_up(&conn->ehwait);
1769 spin_unlock(&session->lock);
1772 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1773 struct iscsi_tm *hdr, int age,
1776 struct iscsi_session *session = conn->session;
1777 struct iscsi_task *task;
1779 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1782 spin_unlock_bh(&session->lock);
1783 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1784 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1785 spin_lock_bh(&session->lock);
1788 conn->tmfcmd_pdus_cnt++;
1789 conn->tmf_timer.expires = timeout * HZ + jiffies;
1790 conn->tmf_timer.function = iscsi_tmf_timedout;
1791 conn->tmf_timer.data = (unsigned long)conn;
1792 add_timer(&conn->tmf_timer);
1793 ISCSI_DBG_EH(session, "tmf set timeout\n");
1795 spin_unlock_bh(&session->lock);
1796 mutex_unlock(&session->eh_mutex);
1799 * block eh thread until:
1803 * 3) session is terminated or restarted or userspace has
1804 * given up on recovery
1806 wait_event_interruptible(conn->ehwait, age != session->age ||
1807 session->state != ISCSI_STATE_LOGGED_IN ||
1808 conn->tmf_state != TMF_QUEUED);
1809 if (signal_pending(current))
1810 flush_signals(current);
1811 del_timer_sync(&conn->tmf_timer);
1813 mutex_lock(&session->eh_mutex);
1814 spin_lock_bh(&session->lock);
1815 /* if the session drops it will clean up the task */
1816 if (age != session->age ||
1817 session->state != ISCSI_STATE_LOGGED_IN)
1823 * Fail commands. session lock held and recv side suspended and xmit
1826 static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1829 struct iscsi_task *task;
1832 for (i = 0; i < conn->session->cmds_max; i++) {
1833 task = conn->session->cmds[i];
1834 if (!task->sc || task->state == ISCSI_TASK_FREE)
1837 if (lun != -1 && lun != task->sc->device->lun)
1840 ISCSI_DBG_SESSION(conn->session,
1841 "failing sc %p itt 0x%x state %d\n",
1842 task->sc, task->itt, task->state);
1843 fail_scsi_task(task, error);
1848 * iscsi_suspend_queue - suspend iscsi_queuecommand
1849 * @conn: iscsi conn to stop queueing IO on
1851 * This grabs the session lock to make sure no one is in
1852 * xmit_task/queuecommand, and then sets suspend to prevent
1853 * new commands from being queued. This only needs to be called
1854 * by offload drivers that need to sync a path like ep disconnect
1855 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1856 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1858 void iscsi_suspend_queue(struct iscsi_conn *conn)
1860 spin_lock_bh(&conn->session->lock);
1861 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1862 spin_unlock_bh(&conn->session->lock);
1864 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1867 * iscsi_suspend_tx - suspend iscsi_data_xmit
1868 * @conn: iscsi conn tp stop processing IO on.
1870 * This function sets the suspend bit to prevent iscsi_data_xmit
1871 * from sending new IO, and if work is queued on the xmit thread
1872 * it will wait for it to be completed.
1874 void iscsi_suspend_tx(struct iscsi_conn *conn)
1876 struct Scsi_Host *shost = conn->session->host;
1877 struct iscsi_host *ihost = shost_priv(shost);
1879 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1881 flush_workqueue(ihost->workq);
1883 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1885 static void iscsi_start_tx(struct iscsi_conn *conn)
1887 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1888 iscsi_conn_queue_work(conn);
1892 * We want to make sure a ping is in flight. It has timed out.
1893 * And we are not busy processing a pdu that is making
1894 * progress but got started before the ping and is taking a while
1895 * to complete so the ping is just stuck behind it in a queue.
1897 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1899 if (conn->ping_task &&
1900 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1901 (conn->ping_timeout * HZ), jiffies))
1907 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1909 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1910 struct iscsi_task *task = NULL, *running_task;
1911 struct iscsi_cls_session *cls_session;
1912 struct iscsi_session *session;
1913 struct iscsi_conn *conn;
1916 cls_session = starget_to_session(scsi_target(sc->device));
1917 session = cls_session->dd_data;
1919 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1921 spin_lock(&session->lock);
1922 if (session->state != ISCSI_STATE_LOGGED_IN) {
1924 * We are probably in the middle of iscsi recovery so let
1925 * that complete and handle the error.
1927 rc = BLK_EH_RESET_TIMER;
1931 conn = session->leadconn;
1933 /* In the middle of shuting down */
1934 rc = BLK_EH_RESET_TIMER;
1938 task = (struct iscsi_task *)sc->SCp.ptr;
1941 * Raced with completion. Just reset timer, and let it
1944 rc = BLK_EH_RESET_TIMER;
1949 * If we have sent (at least queued to the network layer) a pdu or
1950 * recvd one for the task since the last timeout ask for
1951 * more time. If on the next timeout we have not made progress
1952 * we can check if it is the task or connection when we send the
1955 if (time_after(task->last_xfer, task->last_timeout)) {
1956 ISCSI_DBG_EH(session, "Command making progress. Asking "
1957 "scsi-ml for more time to complete. "
1958 "Last data xfer at %lu. Last timeout was at "
1959 "%lu\n.", task->last_xfer, task->last_timeout);
1960 task->have_checked_conn = false;
1961 rc = BLK_EH_RESET_TIMER;
1965 if (!conn->recv_timeout && !conn->ping_timeout)
1968 * if the ping timedout then we are in the middle of cleaning up
1969 * and can let the iscsi eh handle it
1971 if (iscsi_has_ping_timed_out(conn)) {
1972 rc = BLK_EH_RESET_TIMER;
1976 for (i = 0; i < conn->session->cmds_max; i++) {
1977 running_task = conn->session->cmds[i];
1978 if (!running_task->sc || running_task == task ||
1979 running_task->state != ISCSI_TASK_RUNNING)
1983 * Only check if cmds started before this one have made
1984 * progress, or this could never fail
1986 if (time_after(running_task->sc->jiffies_at_alloc,
1987 task->sc->jiffies_at_alloc))
1990 if (time_after(running_task->last_xfer, task->last_timeout)) {
1992 * This task has not made progress, but a task
1993 * started before us has transferred data since
1994 * we started/last-checked. We could be queueing
1995 * too many tasks or the LU is bad.
1997 * If the device is bad the cmds ahead of us on
1998 * other devs will complete, and this loop will
1999 * eventually fail starting the scsi eh.
2001 ISCSI_DBG_EH(session, "Command has not made progress "
2002 "but commands ahead of it have. "
2003 "Asking scsi-ml for more time to "
2004 "complete. Our last xfer vs running task "
2005 "last xfer %lu/%lu. Last check %lu.\n",
2006 task->last_xfer, running_task->last_xfer,
2007 task->last_timeout);
2008 rc = BLK_EH_RESET_TIMER;
2013 /* Assumes nop timeout is shorter than scsi cmd timeout */
2014 if (task->have_checked_conn)
2018 * Checking the transport already or nop from a cmd timeout still
2021 if (conn->ping_task) {
2022 task->have_checked_conn = true;
2023 rc = BLK_EH_RESET_TIMER;
2027 /* Make sure there is a transport check done */
2028 iscsi_send_nopout(conn, NULL);
2029 task->have_checked_conn = true;
2030 rc = BLK_EH_RESET_TIMER;
2034 task->last_timeout = jiffies;
2035 spin_unlock(&session->lock);
2036 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2037 "timer reset" : "nh");
2041 static void iscsi_check_transport_timeouts(unsigned long data)
2043 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2044 struct iscsi_session *session = conn->session;
2045 unsigned long recv_timeout, next_timeout = 0, last_recv;
2047 spin_lock(&session->lock);
2048 if (session->state != ISCSI_STATE_LOGGED_IN)
2051 recv_timeout = conn->recv_timeout;
2056 last_recv = conn->last_recv;
2058 if (iscsi_has_ping_timed_out(conn)) {
2059 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2060 "expired, recv timeout %d, last rx %lu, "
2061 "last ping %lu, now %lu\n",
2062 conn->ping_timeout, conn->recv_timeout,
2063 last_recv, conn->last_ping, jiffies);
2064 spin_unlock(&session->lock);
2065 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2069 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2070 /* send a ping to try to provoke some traffic */
2071 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2072 iscsi_send_nopout(conn, NULL);
2073 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2075 next_timeout = last_recv + recv_timeout;
2077 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2078 mod_timer(&conn->transport_timer, next_timeout);
2080 spin_unlock(&session->lock);
2083 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2084 struct iscsi_tm *hdr)
2086 memset(hdr, 0, sizeof(*hdr));
2087 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2088 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2089 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2090 hdr->lun = task->lun;
2091 hdr->rtt = task->hdr_itt;
2092 hdr->refcmdsn = task->cmdsn;
2095 int iscsi_eh_abort(struct scsi_cmnd *sc)
2097 struct iscsi_cls_session *cls_session;
2098 struct iscsi_session *session;
2099 struct iscsi_conn *conn;
2100 struct iscsi_task *task;
2101 struct iscsi_tm *hdr;
2104 cls_session = starget_to_session(scsi_target(sc->device));
2105 session = cls_session->dd_data;
2107 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2109 mutex_lock(&session->eh_mutex);
2110 spin_lock_bh(&session->lock);
2112 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2116 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2118 spin_unlock_bh(&session->lock);
2119 mutex_unlock(&session->eh_mutex);
2124 * If we are not logged in or we have started a new session
2125 * then let the host reset code handle this
2127 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2128 sc->SCp.phase != session->age) {
2129 spin_unlock_bh(&session->lock);
2130 mutex_unlock(&session->eh_mutex);
2131 ISCSI_DBG_EH(session, "failing abort due to dropped "
2136 conn = session->leadconn;
2137 conn->eh_abort_cnt++;
2140 task = (struct iscsi_task *)sc->SCp.ptr;
2141 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2144 /* task completed before time out */
2146 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2150 if (task->state == ISCSI_TASK_PENDING) {
2151 fail_scsi_task(task, DID_ABORT);
2155 /* only have one tmf outstanding at a time */
2156 if (conn->tmf_state != TMF_INITIAL)
2158 conn->tmf_state = TMF_QUEUED;
2161 iscsi_prep_abort_task_pdu(task, hdr);
2163 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2168 switch (conn->tmf_state) {
2170 spin_unlock_bh(&session->lock);
2172 * stop tx side incase the target had sent a abort rsp but
2173 * the initiator was still writing out data.
2175 iscsi_suspend_tx(conn);
2177 * we do not stop the recv side because targets have been
2178 * good and have never sent us a successful tmf response
2179 * then sent more data for the cmd.
2181 spin_lock_bh(&session->lock);
2182 fail_scsi_task(task, DID_ABORT);
2183 conn->tmf_state = TMF_INITIAL;
2184 memset(hdr, 0, sizeof(*hdr));
2185 spin_unlock_bh(&session->lock);
2186 iscsi_start_tx(conn);
2187 goto success_unlocked;
2189 spin_unlock_bh(&session->lock);
2190 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2191 goto failed_unlocked;
2194 conn->tmf_state = TMF_INITIAL;
2195 memset(hdr, 0, sizeof(*hdr));
2196 /* task completed before tmf abort response */
2197 ISCSI_DBG_EH(session, "sc completed while abort in "
2203 conn->tmf_state = TMF_INITIAL;
2208 spin_unlock_bh(&session->lock);
2210 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2212 mutex_unlock(&session->eh_mutex);
2216 spin_unlock_bh(&session->lock);
2218 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2219 task ? task->itt : 0);
2220 mutex_unlock(&session->eh_mutex);
2223 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2225 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2227 memset(hdr, 0, sizeof(*hdr));
2228 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2229 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2230 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2231 int_to_scsilun(sc->device->lun, &hdr->lun);
2232 hdr->rtt = RESERVED_ITT;
2235 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2237 struct iscsi_cls_session *cls_session;
2238 struct iscsi_session *session;
2239 struct iscsi_conn *conn;
2240 struct iscsi_tm *hdr;
2243 cls_session = starget_to_session(scsi_target(sc->device));
2244 session = cls_session->dd_data;
2246 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
2248 mutex_lock(&session->eh_mutex);
2249 spin_lock_bh(&session->lock);
2251 * Just check if we are not logged in. We cannot check for
2252 * the phase because the reset could come from a ioctl.
2254 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2256 conn = session->leadconn;
2258 /* only have one tmf outstanding at a time */
2259 if (conn->tmf_state != TMF_INITIAL)
2261 conn->tmf_state = TMF_QUEUED;
2264 iscsi_prep_lun_reset_pdu(sc, hdr);
2266 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2267 session->lu_reset_timeout)) {
2272 switch (conn->tmf_state) {
2276 spin_unlock_bh(&session->lock);
2277 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2280 conn->tmf_state = TMF_INITIAL;
2285 spin_unlock_bh(&session->lock);
2287 iscsi_suspend_tx(conn);
2289 spin_lock_bh(&session->lock);
2290 memset(hdr, 0, sizeof(*hdr));
2291 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2292 conn->tmf_state = TMF_INITIAL;
2293 spin_unlock_bh(&session->lock);
2295 iscsi_start_tx(conn);
2299 spin_unlock_bh(&session->lock);
2301 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2302 rc == SUCCESS ? "SUCCESS" : "FAILED");
2303 mutex_unlock(&session->eh_mutex);
2306 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2308 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2310 struct iscsi_session *session = cls_session->dd_data;
2312 spin_lock_bh(&session->lock);
2313 if (session->state != ISCSI_STATE_LOGGED_IN) {
2314 session->state = ISCSI_STATE_RECOVERY_FAILED;
2315 if (session->leadconn)
2316 wake_up(&session->leadconn->ehwait);
2318 spin_unlock_bh(&session->lock);
2320 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2323 * iscsi_eh_session_reset - drop session and attempt relogin
2326 * This function will wait for a relogin, session termination from
2327 * userspace, or a recovery/replacement timeout.
2329 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2331 struct iscsi_cls_session *cls_session;
2332 struct iscsi_session *session;
2333 struct iscsi_conn *conn;
2335 cls_session = starget_to_session(scsi_target(sc->device));
2336 session = cls_session->dd_data;
2337 conn = session->leadconn;
2339 mutex_lock(&session->eh_mutex);
2340 spin_lock_bh(&session->lock);
2341 if (session->state == ISCSI_STATE_TERMINATE) {
2343 ISCSI_DBG_EH(session,
2344 "failing session reset: Could not log back into "
2345 "%s, %s [age %d]\n", session->targetname,
2346 conn->persistent_address, session->age);
2347 spin_unlock_bh(&session->lock);
2348 mutex_unlock(&session->eh_mutex);
2352 spin_unlock_bh(&session->lock);
2353 mutex_unlock(&session->eh_mutex);
2355 * we drop the lock here but the leadconn cannot be destoyed while
2356 * we are in the scsi eh
2358 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2360 ISCSI_DBG_EH(session, "wait for relogin\n");
2361 wait_event_interruptible(conn->ehwait,
2362 session->state == ISCSI_STATE_TERMINATE ||
2363 session->state == ISCSI_STATE_LOGGED_IN ||
2364 session->state == ISCSI_STATE_RECOVERY_FAILED);
2365 if (signal_pending(current))
2366 flush_signals(current);
2368 mutex_lock(&session->eh_mutex);
2369 spin_lock_bh(&session->lock);
2370 if (session->state == ISCSI_STATE_LOGGED_IN) {
2371 ISCSI_DBG_EH(session,
2372 "session reset succeeded for %s,%s\n",
2373 session->targetname, conn->persistent_address);
2376 spin_unlock_bh(&session->lock);
2377 mutex_unlock(&session->eh_mutex);
2380 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2382 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2384 memset(hdr, 0, sizeof(*hdr));
2385 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2386 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2387 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2388 hdr->rtt = RESERVED_ITT;
2392 * iscsi_eh_target_reset - reset target
2395 * This will attempt to send a warm target reset.
2397 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2399 struct iscsi_cls_session *cls_session;
2400 struct iscsi_session *session;
2401 struct iscsi_conn *conn;
2402 struct iscsi_tm *hdr;
2405 cls_session = starget_to_session(scsi_target(sc->device));
2406 session = cls_session->dd_data;
2408 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2409 session->targetname);
2411 mutex_lock(&session->eh_mutex);
2412 spin_lock_bh(&session->lock);
2414 * Just check if we are not logged in. We cannot check for
2415 * the phase because the reset could come from a ioctl.
2417 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2419 conn = session->leadconn;
2421 /* only have one tmf outstanding at a time */
2422 if (conn->tmf_state != TMF_INITIAL)
2424 conn->tmf_state = TMF_QUEUED;
2427 iscsi_prep_tgt_reset_pdu(sc, hdr);
2429 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2430 session->tgt_reset_timeout)) {
2435 switch (conn->tmf_state) {
2439 spin_unlock_bh(&session->lock);
2440 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2443 conn->tmf_state = TMF_INITIAL;
2448 spin_unlock_bh(&session->lock);
2450 iscsi_suspend_tx(conn);
2452 spin_lock_bh(&session->lock);
2453 memset(hdr, 0, sizeof(*hdr));
2454 fail_scsi_tasks(conn, -1, DID_ERROR);
2455 conn->tmf_state = TMF_INITIAL;
2456 spin_unlock_bh(&session->lock);
2458 iscsi_start_tx(conn);
2462 spin_unlock_bh(&session->lock);
2464 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2465 rc == SUCCESS ? "SUCCESS" : "FAILED");
2466 mutex_unlock(&session->eh_mutex);
2469 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2472 * iscsi_eh_recover_target - reset target and possibly the session
2475 * This will attempt to send a warm target reset. If that fails,
2476 * we will escalate to ERL0 session recovery.
2478 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2482 rc = iscsi_eh_target_reset(sc);
2484 rc = iscsi_eh_session_reset(sc);
2487 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2490 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2491 * should be accessed via kfifo_{get,put} on q->queue.
2492 * Optionally, the caller can obtain the array of object pointers
2493 * by passing in a non-NULL @items pointer
2496 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2498 int i, num_arrays = 1;
2500 memset(q, 0, sizeof(*q));
2504 /* If the user passed an items pointer, he wants a copy of
2508 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2509 if (q->pool == NULL)
2512 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2514 for (i = 0; i < max; i++) {
2515 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2516 if (q->pool[i] == NULL) {
2520 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2524 *items = q->pool + max;
2525 memcpy(*items, q->pool, max * sizeof(void *));
2534 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2536 void iscsi_pool_free(struct iscsi_pool *q)
2540 for (i = 0; i < q->max; i++)
2544 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2547 * iscsi_host_add - add host to system
2549 * @pdev: parent device
2551 * This should be called by partial offload and software iscsi drivers
2552 * to add a host to the system.
2554 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2556 if (!shost->can_queue)
2557 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2559 if (!shost->cmd_per_lun)
2560 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2562 if (!shost->transportt->eh_timed_out)
2563 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2564 return scsi_add_host(shost, pdev);
2566 EXPORT_SYMBOL_GPL(iscsi_host_add);
2569 * iscsi_host_alloc - allocate a host and driver data
2570 * @sht: scsi host template
2571 * @dd_data_size: driver host data size
2572 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2574 * This should be called by partial offload and software iscsi drivers.
2575 * To access the driver specific memory use the iscsi_host_priv() macro.
2577 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2578 int dd_data_size, bool xmit_can_sleep)
2580 struct Scsi_Host *shost;
2581 struct iscsi_host *ihost;
2583 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2586 ihost = shost_priv(shost);
2588 if (xmit_can_sleep) {
2589 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2590 "iscsi_q_%d", shost->host_no);
2591 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2596 spin_lock_init(&ihost->lock);
2597 ihost->state = ISCSI_HOST_SETUP;
2598 ihost->num_sessions = 0;
2599 init_waitqueue_head(&ihost->session_removal_wq);
2603 scsi_host_put(shost);
2606 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2608 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2610 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2614 * iscsi_host_remove - remove host and sessions
2617 * If there are any sessions left, this will initiate the removal and wait
2618 * for the completion.
2620 void iscsi_host_remove(struct Scsi_Host *shost)
2622 struct iscsi_host *ihost = shost_priv(shost);
2623 unsigned long flags;
2625 spin_lock_irqsave(&ihost->lock, flags);
2626 ihost->state = ISCSI_HOST_REMOVED;
2627 spin_unlock_irqrestore(&ihost->lock, flags);
2629 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2630 wait_event_interruptible(ihost->session_removal_wq,
2631 ihost->num_sessions == 0);
2632 if (signal_pending(current))
2633 flush_signals(current);
2635 scsi_remove_host(shost);
2637 destroy_workqueue(ihost->workq);
2639 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2641 void iscsi_host_free(struct Scsi_Host *shost)
2643 struct iscsi_host *ihost = shost_priv(shost);
2645 kfree(ihost->netdev);
2646 kfree(ihost->hwaddress);
2647 kfree(ihost->initiatorname);
2648 scsi_host_put(shost);
2650 EXPORT_SYMBOL_GPL(iscsi_host_free);
2652 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2654 struct iscsi_host *ihost = shost_priv(shost);
2655 unsigned long flags;
2657 shost = scsi_host_get(shost);
2659 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2660 "of session teardown event because host already "
2665 spin_lock_irqsave(&ihost->lock, flags);
2666 ihost->num_sessions--;
2667 if (ihost->num_sessions == 0)
2668 wake_up(&ihost->session_removal_wq);
2669 spin_unlock_irqrestore(&ihost->lock, flags);
2670 scsi_host_put(shost);
2674 * iscsi_session_setup - create iscsi cls session and host and session
2675 * @iscsit: iscsi transport template
2677 * @cmds_max: session can queue
2678 * @cmd_task_size: LLD task private data size
2679 * @initial_cmdsn: initial CmdSN
2681 * This can be used by software iscsi_transports that allocate
2682 * a session per scsi host.
2684 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2685 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2686 * for nop handling and login/logout requests.
2688 struct iscsi_cls_session *
2689 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2690 uint16_t cmds_max, int dd_size, int cmd_task_size,
2691 uint32_t initial_cmdsn, unsigned int id)
2693 struct iscsi_host *ihost = shost_priv(shost);
2694 struct iscsi_session *session;
2695 struct iscsi_cls_session *cls_session;
2696 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2697 unsigned long flags;
2699 spin_lock_irqsave(&ihost->lock, flags);
2700 if (ihost->state == ISCSI_HOST_REMOVED) {
2701 spin_unlock_irqrestore(&ihost->lock, flags);
2704 ihost->num_sessions++;
2705 spin_unlock_irqrestore(&ihost->lock, flags);
2708 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2710 * The iscsi layer needs some tasks for nop handling and tmfs,
2711 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2712 * + 1 command for scsi IO.
2714 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2715 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2716 "must be a power of two that is at least %d.\n",
2717 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2718 goto dec_session_count;
2721 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2722 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2723 "must be a power of 2 less than or equal to %d.\n",
2724 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2725 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2728 if (!is_power_of_2(total_cmds)) {
2729 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2730 "must be a power of 2.\n", total_cmds);
2731 total_cmds = rounddown_pow_of_two(total_cmds);
2732 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2734 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2737 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2739 cls_session = iscsi_alloc_session(shost, iscsit,
2740 sizeof(struct iscsi_session) +
2743 goto dec_session_count;
2744 session = cls_session->dd_data;
2745 session->cls_session = cls_session;
2746 session->host = shost;
2747 session->state = ISCSI_STATE_FREE;
2748 session->fast_abort = 1;
2749 session->tgt_reset_timeout = 30;
2750 session->lu_reset_timeout = 15;
2751 session->abort_timeout = 10;
2752 session->scsi_cmds_max = scsi_cmds;
2753 session->cmds_max = total_cmds;
2754 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2755 session->exp_cmdsn = initial_cmdsn + 1;
2756 session->max_cmdsn = initial_cmdsn + 1;
2757 session->max_r2t = 1;
2758 session->tt = iscsit;
2759 session->dd_data = cls_session->dd_data + sizeof(*session);
2760 mutex_init(&session->eh_mutex);
2761 spin_lock_init(&session->lock);
2763 /* initialize SCSI PDU commands pool */
2764 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2765 (void***)&session->cmds,
2766 cmd_task_size + sizeof(struct iscsi_task)))
2767 goto cmdpool_alloc_fail;
2769 /* pre-format cmds pool with ITT */
2770 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2771 struct iscsi_task *task = session->cmds[cmd_i];
2774 task->dd_data = &task[1];
2776 task->state = ISCSI_TASK_FREE;
2777 INIT_LIST_HEAD(&task->running);
2780 if (!try_module_get(iscsit->owner))
2781 goto module_get_fail;
2783 if (iscsi_add_session(cls_session, id))
2784 goto cls_session_fail;
2789 module_put(iscsit->owner);
2791 iscsi_pool_free(&session->cmdpool);
2793 iscsi_free_session(cls_session);
2795 iscsi_host_dec_session_cnt(shost);
2798 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2801 * iscsi_session_teardown - destroy session, host, and cls_session
2802 * @cls_session: iscsi session
2804 * The driver must have called iscsi_remove_session before
2807 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2809 struct iscsi_session *session = cls_session->dd_data;
2810 struct module *owner = cls_session->transport->owner;
2811 struct Scsi_Host *shost = session->host;
2813 iscsi_pool_free(&session->cmdpool);
2815 kfree(session->password);
2816 kfree(session->password_in);
2817 kfree(session->username);
2818 kfree(session->username_in);
2819 kfree(session->targetname);
2820 kfree(session->initiatorname);
2821 kfree(session->ifacename);
2823 iscsi_destroy_session(cls_session);
2824 iscsi_host_dec_session_cnt(shost);
2827 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2830 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2831 * @cls_session: iscsi_cls_session
2832 * @dd_size: private driver data size
2835 struct iscsi_cls_conn *
2836 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2839 struct iscsi_session *session = cls_session->dd_data;
2840 struct iscsi_conn *conn;
2841 struct iscsi_cls_conn *cls_conn;
2844 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2848 conn = cls_conn->dd_data;
2849 memset(conn, 0, sizeof(*conn) + dd_size);
2851 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2852 conn->session = session;
2853 conn->cls_conn = cls_conn;
2854 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2855 conn->id = conn_idx;
2856 conn->exp_statsn = 0;
2857 conn->tmf_state = TMF_INITIAL;
2859 init_timer(&conn->transport_timer);
2860 conn->transport_timer.data = (unsigned long)conn;
2861 conn->transport_timer.function = iscsi_check_transport_timeouts;
2863 INIT_LIST_HEAD(&conn->mgmtqueue);
2864 INIT_LIST_HEAD(&conn->cmdqueue);
2865 INIT_LIST_HEAD(&conn->requeue);
2866 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2868 /* allocate login_task used for the login/text sequences */
2869 spin_lock_bh(&session->lock);
2870 if (!kfifo_out(&session->cmdpool.queue,
2871 (void*)&conn->login_task,
2873 spin_unlock_bh(&session->lock);
2874 goto login_task_alloc_fail;
2876 spin_unlock_bh(&session->lock);
2878 data = (char *) __get_free_pages(GFP_KERNEL,
2879 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2881 goto login_task_data_alloc_fail;
2882 conn->login_task->data = conn->data = data;
2884 init_timer(&conn->tmf_timer);
2885 init_waitqueue_head(&conn->ehwait);
2889 login_task_data_alloc_fail:
2890 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2892 login_task_alloc_fail:
2893 iscsi_destroy_conn(cls_conn);
2896 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2899 * iscsi_conn_teardown - teardown iscsi connection
2900 * cls_conn: iscsi class connection
2902 * TODO: we may need to make this into a two step process
2903 * like scsi-mls remove + put host
2905 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2907 struct iscsi_conn *conn = cls_conn->dd_data;
2908 struct iscsi_session *session = conn->session;
2910 del_timer_sync(&conn->transport_timer);
2912 mutex_lock(&session->eh_mutex);
2913 spin_lock_bh(&session->lock);
2914 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2915 if (session->leadconn == conn) {
2917 * leading connection? then give up on recovery.
2919 session->state = ISCSI_STATE_TERMINATE;
2920 wake_up(&conn->ehwait);
2922 spin_unlock_bh(&session->lock);
2924 /* flush queued up work because we free the connection below */
2925 iscsi_suspend_tx(conn);
2927 spin_lock_bh(&session->lock);
2928 free_pages((unsigned long) conn->data,
2929 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2930 kfree(conn->persistent_address);
2931 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2933 if (session->leadconn == conn)
2934 session->leadconn = NULL;
2935 spin_unlock_bh(&session->lock);
2936 mutex_unlock(&session->eh_mutex);
2938 iscsi_destroy_conn(cls_conn);
2940 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2942 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2944 struct iscsi_conn *conn = cls_conn->dd_data;
2945 struct iscsi_session *session = conn->session;
2948 iscsi_conn_printk(KERN_ERR, conn,
2949 "can't start unbound connection\n");
2953 if ((session->imm_data_en || !session->initial_r2t_en) &&
2954 session->first_burst > session->max_burst) {
2955 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2956 "first_burst %d max_burst %d\n",
2957 session->first_burst, session->max_burst);
2961 if (conn->ping_timeout && !conn->recv_timeout) {
2962 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2963 "zero. Using 5 seconds\n.");
2964 conn->recv_timeout = 5;
2967 if (conn->recv_timeout && !conn->ping_timeout) {
2968 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2969 "zero. Using 5 seconds.\n");
2970 conn->ping_timeout = 5;
2973 spin_lock_bh(&session->lock);
2974 conn->c_stage = ISCSI_CONN_STARTED;
2975 session->state = ISCSI_STATE_LOGGED_IN;
2976 session->queued_cmdsn = session->cmdsn;
2978 conn->last_recv = jiffies;
2979 conn->last_ping = jiffies;
2980 if (conn->recv_timeout && conn->ping_timeout)
2981 mod_timer(&conn->transport_timer,
2982 jiffies + (conn->recv_timeout * HZ));
2984 switch(conn->stop_stage) {
2985 case STOP_CONN_RECOVER:
2987 * unblock eh_abort() if it is blocked. re-try all
2988 * commands after successful recovery
2990 conn->stop_stage = 0;
2991 conn->tmf_state = TMF_INITIAL;
2993 if (session->age == 16)
2996 case STOP_CONN_TERM:
2997 conn->stop_stage = 0;
3002 spin_unlock_bh(&session->lock);
3004 iscsi_unblock_session(session->cls_session);
3005 wake_up(&conn->ehwait);
3008 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3011 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3013 struct iscsi_task *task;
3016 for (i = 0; i < conn->session->cmds_max; i++) {
3017 task = conn->session->cmds[i];
3021 if (task->state == ISCSI_TASK_FREE)
3024 ISCSI_DBG_SESSION(conn->session,
3025 "failing mgmt itt 0x%x state %d\n",
3026 task->itt, task->state);
3027 state = ISCSI_TASK_ABRT_SESS_RECOV;
3028 if (task->state == ISCSI_TASK_PENDING)
3029 state = ISCSI_TASK_COMPLETED;
3030 iscsi_complete_task(task, state);
3035 static void iscsi_start_session_recovery(struct iscsi_session *session,
3036 struct iscsi_conn *conn, int flag)
3040 mutex_lock(&session->eh_mutex);
3041 spin_lock_bh(&session->lock);
3042 if (conn->stop_stage == STOP_CONN_TERM) {
3043 spin_unlock_bh(&session->lock);
3044 mutex_unlock(&session->eh_mutex);
3049 * When this is called for the in_login state, we only want to clean
3050 * up the login task and connection. We do not need to block and set
3051 * the recovery state again
3053 if (flag == STOP_CONN_TERM)
3054 session->state = ISCSI_STATE_TERMINATE;
3055 else if (conn->stop_stage != STOP_CONN_RECOVER)
3056 session->state = ISCSI_STATE_IN_RECOVERY;
3058 old_stop_stage = conn->stop_stage;
3059 conn->stop_stage = flag;
3060 spin_unlock_bh(&session->lock);
3062 del_timer_sync(&conn->transport_timer);
3063 iscsi_suspend_tx(conn);
3065 spin_lock_bh(&session->lock);
3066 conn->c_stage = ISCSI_CONN_STOPPED;
3067 spin_unlock_bh(&session->lock);
3070 * for connection level recovery we should not calculate
3071 * header digest. conn->hdr_size used for optimization
3072 * in hdr_extract() and will be re-negotiated at
3075 if (flag == STOP_CONN_RECOVER) {
3076 conn->hdrdgst_en = 0;
3077 conn->datadgst_en = 0;
3078 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3079 old_stop_stage != STOP_CONN_RECOVER) {
3080 ISCSI_DBG_SESSION(session, "blocking session\n");
3081 iscsi_block_session(session->cls_session);
3088 spin_lock_bh(&session->lock);
3089 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3090 fail_mgmt_tasks(session, conn);
3091 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3092 spin_unlock_bh(&session->lock);
3093 mutex_unlock(&session->eh_mutex);
3096 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3098 struct iscsi_conn *conn = cls_conn->dd_data;
3099 struct iscsi_session *session = conn->session;
3102 case STOP_CONN_RECOVER:
3103 case STOP_CONN_TERM:
3104 iscsi_start_session_recovery(session, conn, flag);
3107 iscsi_conn_printk(KERN_ERR, conn,
3108 "invalid stop flag %d\n", flag);
3111 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3113 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3114 struct iscsi_cls_conn *cls_conn, int is_leading)
3116 struct iscsi_session *session = cls_session->dd_data;
3117 struct iscsi_conn *conn = cls_conn->dd_data;
3119 spin_lock_bh(&session->lock);
3121 session->leadconn = conn;
3122 spin_unlock_bh(&session->lock);
3125 * Unblock xmitworker(), Login Phase will pass through.
3127 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3128 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3131 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3133 static int iscsi_switch_str_param(char **param, char *new_val_buf)
3138 if (!strcmp(*param, new_val_buf))
3142 new_val = kstrdup(new_val_buf, GFP_NOIO);
3151 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3152 enum iscsi_param param, char *buf, int buflen)
3154 struct iscsi_conn *conn = cls_conn->dd_data;
3155 struct iscsi_session *session = conn->session;
3158 case ISCSI_PARAM_FAST_ABORT:
3159 sscanf(buf, "%d", &session->fast_abort);
3161 case ISCSI_PARAM_ABORT_TMO:
3162 sscanf(buf, "%d", &session->abort_timeout);
3164 case ISCSI_PARAM_LU_RESET_TMO:
3165 sscanf(buf, "%d", &session->lu_reset_timeout);
3167 case ISCSI_PARAM_TGT_RESET_TMO:
3168 sscanf(buf, "%d", &session->tgt_reset_timeout);
3170 case ISCSI_PARAM_PING_TMO:
3171 sscanf(buf, "%d", &conn->ping_timeout);
3173 case ISCSI_PARAM_RECV_TMO:
3174 sscanf(buf, "%d", &conn->recv_timeout);
3176 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3177 sscanf(buf, "%d", &conn->max_recv_dlength);
3179 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3180 sscanf(buf, "%d", &conn->max_xmit_dlength);
3182 case ISCSI_PARAM_HDRDGST_EN:
3183 sscanf(buf, "%d", &conn->hdrdgst_en);
3185 case ISCSI_PARAM_DATADGST_EN:
3186 sscanf(buf, "%d", &conn->datadgst_en);
3188 case ISCSI_PARAM_INITIAL_R2T_EN:
3189 sscanf(buf, "%d", &session->initial_r2t_en);
3191 case ISCSI_PARAM_MAX_R2T:
3192 sscanf(buf, "%d", &session->max_r2t);
3194 case ISCSI_PARAM_IMM_DATA_EN:
3195 sscanf(buf, "%d", &session->imm_data_en);
3197 case ISCSI_PARAM_FIRST_BURST:
3198 sscanf(buf, "%d", &session->first_burst);
3200 case ISCSI_PARAM_MAX_BURST:
3201 sscanf(buf, "%d", &session->max_burst);
3203 case ISCSI_PARAM_PDU_INORDER_EN:
3204 sscanf(buf, "%d", &session->pdu_inorder_en);
3206 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3207 sscanf(buf, "%d", &session->dataseq_inorder_en);
3209 case ISCSI_PARAM_ERL:
3210 sscanf(buf, "%d", &session->erl);
3212 case ISCSI_PARAM_EXP_STATSN:
3213 sscanf(buf, "%u", &conn->exp_statsn);
3215 case ISCSI_PARAM_USERNAME:
3216 return iscsi_switch_str_param(&session->username, buf);
3217 case ISCSI_PARAM_USERNAME_IN:
3218 return iscsi_switch_str_param(&session->username_in, buf);
3219 case ISCSI_PARAM_PASSWORD:
3220 return iscsi_switch_str_param(&session->password, buf);
3221 case ISCSI_PARAM_PASSWORD_IN:
3222 return iscsi_switch_str_param(&session->password_in, buf);
3223 case ISCSI_PARAM_TARGET_NAME:
3224 return iscsi_switch_str_param(&session->targetname, buf);
3225 case ISCSI_PARAM_TPGT:
3226 sscanf(buf, "%d", &session->tpgt);
3228 case ISCSI_PARAM_PERSISTENT_PORT:
3229 sscanf(buf, "%d", &conn->persistent_port);
3231 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3232 return iscsi_switch_str_param(&conn->persistent_address, buf);
3233 case ISCSI_PARAM_IFACE_NAME:
3234 return iscsi_switch_str_param(&session->ifacename, buf);
3235 case ISCSI_PARAM_INITIATOR_NAME:
3236 return iscsi_switch_str_param(&session->initiatorname, buf);
3243 EXPORT_SYMBOL_GPL(iscsi_set_param);
3245 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3246 enum iscsi_param param, char *buf)
3248 struct iscsi_session *session = cls_session->dd_data;
3252 case ISCSI_PARAM_FAST_ABORT:
3253 len = sprintf(buf, "%d\n", session->fast_abort);
3255 case ISCSI_PARAM_ABORT_TMO:
3256 len = sprintf(buf, "%d\n", session->abort_timeout);
3258 case ISCSI_PARAM_LU_RESET_TMO:
3259 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3261 case ISCSI_PARAM_TGT_RESET_TMO:
3262 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3264 case ISCSI_PARAM_INITIAL_R2T_EN:
3265 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3267 case ISCSI_PARAM_MAX_R2T:
3268 len = sprintf(buf, "%hu\n", session->max_r2t);
3270 case ISCSI_PARAM_IMM_DATA_EN:
3271 len = sprintf(buf, "%d\n", session->imm_data_en);
3273 case ISCSI_PARAM_FIRST_BURST:
3274 len = sprintf(buf, "%u\n", session->first_burst);
3276 case ISCSI_PARAM_MAX_BURST:
3277 len = sprintf(buf, "%u\n", session->max_burst);
3279 case ISCSI_PARAM_PDU_INORDER_EN:
3280 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3282 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3283 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3285 case ISCSI_PARAM_ERL:
3286 len = sprintf(buf, "%d\n", session->erl);
3288 case ISCSI_PARAM_TARGET_NAME:
3289 len = sprintf(buf, "%s\n", session->targetname);
3291 case ISCSI_PARAM_TPGT:
3292 len = sprintf(buf, "%d\n", session->tpgt);
3294 case ISCSI_PARAM_USERNAME:
3295 len = sprintf(buf, "%s\n", session->username);
3297 case ISCSI_PARAM_USERNAME_IN:
3298 len = sprintf(buf, "%s\n", session->username_in);
3300 case ISCSI_PARAM_PASSWORD:
3301 len = sprintf(buf, "%s\n", session->password);
3303 case ISCSI_PARAM_PASSWORD_IN:
3304 len = sprintf(buf, "%s\n", session->password_in);
3306 case ISCSI_PARAM_IFACE_NAME:
3307 len = sprintf(buf, "%s\n", session->ifacename);
3309 case ISCSI_PARAM_INITIATOR_NAME:
3310 len = sprintf(buf, "%s\n", session->initiatorname);
3318 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3320 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3321 enum iscsi_param param, char *buf)
3323 struct sockaddr_in6 *sin6 = NULL;
3324 struct sockaddr_in *sin = NULL;
3327 switch (addr->ss_family) {
3329 sin = (struct sockaddr_in *)addr;
3332 sin6 = (struct sockaddr_in6 *)addr;
3339 case ISCSI_PARAM_CONN_ADDRESS:
3340 case ISCSI_HOST_PARAM_IPADDRESS:
3342 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3344 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3346 case ISCSI_PARAM_CONN_PORT:
3348 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3350 len = sprintf(buf, "%hu\n",
3351 be16_to_cpu(sin6->sin6_port));
3359 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3361 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3362 enum iscsi_param param, char *buf)
3364 struct iscsi_conn *conn = cls_conn->dd_data;
3368 case ISCSI_PARAM_PING_TMO:
3369 len = sprintf(buf, "%u\n", conn->ping_timeout);
3371 case ISCSI_PARAM_RECV_TMO:
3372 len = sprintf(buf, "%u\n", conn->recv_timeout);
3374 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3375 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3377 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3378 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3380 case ISCSI_PARAM_HDRDGST_EN:
3381 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3383 case ISCSI_PARAM_DATADGST_EN:
3384 len = sprintf(buf, "%d\n", conn->datadgst_en);
3386 case ISCSI_PARAM_IFMARKER_EN:
3387 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3389 case ISCSI_PARAM_OFMARKER_EN:
3390 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3392 case ISCSI_PARAM_EXP_STATSN:
3393 len = sprintf(buf, "%u\n", conn->exp_statsn);
3395 case ISCSI_PARAM_PERSISTENT_PORT:
3396 len = sprintf(buf, "%d\n", conn->persistent_port);
3398 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3399 len = sprintf(buf, "%s\n", conn->persistent_address);
3407 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3409 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3412 struct iscsi_host *ihost = shost_priv(shost);
3416 case ISCSI_HOST_PARAM_NETDEV_NAME:
3417 len = sprintf(buf, "%s\n", ihost->netdev);
3419 case ISCSI_HOST_PARAM_HWADDRESS:
3420 len = sprintf(buf, "%s\n", ihost->hwaddress);
3422 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3423 len = sprintf(buf, "%s\n", ihost->initiatorname);
3431 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3433 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3434 char *buf, int buflen)
3436 struct iscsi_host *ihost = shost_priv(shost);
3439 case ISCSI_HOST_PARAM_NETDEV_NAME:
3440 return iscsi_switch_str_param(&ihost->netdev, buf);
3441 case ISCSI_HOST_PARAM_HWADDRESS:
3442 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3443 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3444 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3451 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3453 MODULE_AUTHOR("Mike Christie");
3454 MODULE_DESCRIPTION("iSCSI library functions");
3455 MODULE_LICENSE("GPL");