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;
117 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
120 be32_to_cpu(hdr->max_cmdsn));
122 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
128 * @hdr: iscsi data in pdu
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
134 * This function is called with connection lock taken.
136 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
137 struct iscsi_data *hdr)
139 struct iscsi_conn *conn = task->conn;
140 unsigned int left = r2t->data_length - r2t->sent;
142 task->hdr_len = sizeof(struct iscsi_data);
144 memset(hdr, 0, sizeof(struct iscsi_data));
146 hdr->datasn = cpu_to_be32(r2t->datasn);
148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
149 hdr->lun = task->lun;
150 hdr->itt = task->hdr_itt;
151 hdr->exp_statsn = r2t->exp_statsn;
152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
153 if (left > conn->max_xmit_dlength) {
154 hton24(hdr->dlength, conn->max_xmit_dlength);
155 r2t->data_count = conn->max_xmit_dlength;
158 hton24(hdr->dlength, left);
159 r2t->data_count = left;
160 hdr->flags = ISCSI_FLAG_CMD_FINAL;
162 conn->dataout_pdus_cnt++;
164 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
166 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
168 unsigned exp_len = task->hdr_len + len;
170 if (exp_len > task->hdr_max) {
175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
176 task->hdr_len = exp_len;
181 * make an extended cdb AHS
183 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
185 struct scsi_cmnd *cmd = task->sc;
186 unsigned rlen, pad_len;
187 unsigned short ahslength;
188 struct iscsi_ecdb_ahdr *ecdb_ahdr;
191 ecdb_ahdr = iscsi_next_hdr(task);
192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
195 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
197 pad_len = iscsi_padding(rlen);
199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
209 ecdb_ahdr->reserved = 0;
210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
212 ISCSI_DBG_SESSION(task->conn->session,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
220 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
222 struct scsi_cmnd *sc = task->sc;
223 struct iscsi_rlength_ahdr *rlen_ahdr;
226 rlen_ahdr = iscsi_next_hdr(task);
227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
231 rlen_ahdr->ahslength =
232 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
233 sizeof(rlen_ahdr->reserved));
234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
235 rlen_ahdr->reserved = 0;
236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
238 ISCSI_DBG_SESSION(task->conn->session,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr->read_length),
242 be16_to_cpu(rlen_ahdr->ahslength));
247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
249 * @opcode: opcode to check for
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
259 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
261 struct iscsi_conn *conn = task->conn;
262 struct iscsi_tm *tmf = &conn->tmhdr;
265 if (conn->tmf_state == TMF_INITIAL)
268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
271 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
274 * Allow PDUs for unrelated LUNs
276 hdr_lun = scsilun_to_int(&tmf->lun);
277 if (hdr_lun != task->sc->device->lun)
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
282 * Fail all SCSI cmd PDUs
284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
285 iscsi_conn_printk(KERN_INFO, conn,
286 "task [op %x/%x itt "
289 task->hdr->opcode, opcode,
290 task->itt, task->hdr_itt);
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
297 if (conn->session->fast_abort) {
298 iscsi_conn_printk(KERN_INFO, conn,
299 "task [op %x/%x itt "
300 "0x%x/0x%x] fast abort.\n",
301 task->hdr->opcode, opcode,
302 task->itt, task->hdr_itt);
306 case ISCSI_TM_FUNC_ABORT_TASK:
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
313 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
314 task->hdr_itt == tmf->rtt) {
315 ISCSI_DBG_SESSION(conn->session,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task->itt,
329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
335 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
337 struct iscsi_conn *conn = task->conn;
338 struct iscsi_session *session = conn->session;
339 struct scsi_cmnd *sc = task->sc;
340 struct iscsi_scsi_req *hdr;
341 unsigned hdrlength, cmd_len, transfer_length;
345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
349 if (conn->session->tt->alloc_pdu) {
350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
354 hdr = (struct iscsi_scsi_req *)task->hdr;
356 memset(hdr, 0, sizeof(*hdr));
358 if (session->tt->parse_pdu_itt)
359 hdr->itt = task->hdr_itt = itt;
361 hdr->itt = task->hdr_itt = build_itt(task->itt,
362 task->conn->session->age);
364 rc = iscsi_add_hdr(task, sizeof(*hdr));
367 hdr->opcode = ISCSI_OP_SCSI_CMD;
368 hdr->flags = ISCSI_ATTR_SIMPLE;
369 int_to_scsilun(sc->device->lun, &hdr->lun);
370 task->lun = hdr->lun;
371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
372 cmd_len = sc->cmd_len;
373 if (cmd_len < ISCSI_CDB_SIZE)
374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
375 else if (cmd_len > ISCSI_CDB_SIZE) {
376 rc = iscsi_prep_ecdb_ahs(task);
379 cmd_len = ISCSI_CDB_SIZE;
381 memcpy(hdr->cdb, sc->cmnd, cmd_len);
384 if (scsi_bidi_cmnd(sc)) {
385 hdr->flags |= ISCSI_FLAG_CMD_READ;
386 rc = iscsi_prep_bidi_ahs(task);
391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
392 task->protected = true;
394 transfer_length = scsi_transfer_length(sc);
395 hdr->data_length = cpu_to_be32(transfer_length);
396 if (sc->sc_data_direction == DMA_TO_DEVICE) {
397 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
399 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
403 * imm_count bytes to be sent right after
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
410 * r2t data_length bytes to be sent via R2T ack's
412 * pad_count bytes to be sent as zero-padding
414 memset(r2t, 0, sizeof(*r2t));
416 if (session->imm_data_en) {
417 if (transfer_length >= session->first_burst)
418 task->imm_count = min(session->first_burst,
419 conn->max_xmit_dlength);
421 task->imm_count = min(transfer_length,
422 conn->max_xmit_dlength);
423 hton24(hdr->dlength, task->imm_count);
425 zero_data(hdr->dlength);
427 if (!session->initial_r2t_en) {
428 r2t->data_length = min(session->first_burst,
431 r2t->data_offset = task->imm_count;
432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
436 if (!task->unsol_r2t.data_length)
437 /* No unsolicit Data-Out's */
438 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 zero_data(hdr->dlength);
443 if (sc->sc_data_direction == DMA_FROM_DEVICE)
444 hdr->flags |= ISCSI_FLAG_CMD_READ;
447 /* calculate size of additional header segments (AHSs) */
448 hdrlength = task->hdr_len - sizeof(*hdr);
450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
451 hdrlength /= ISCSI_PAD_LEN;
453 WARN_ON(hdrlength >= 256);
454 hdr->hlength = hdrlength & 0xFF;
455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
457 if (session->tt->init_task && session->tt->init_task(task))
460 task->state = ISCSI_TASK_RUNNING;
463 conn->scsicmd_pdus_cnt++;
464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc) ? "bidirectional" :
467 sc->sc_data_direction == DMA_TO_DEVICE ?
468 "write" : "read", conn->id, sc, sc->cmnd[0],
469 task->itt, transfer_length,
470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
472 session->max_cmdsn - session->exp_cmdsn + 1);
477 * iscsi_free_task - free a task
478 * @task: iscsi cmd task
480 * Must be called with session back_lock.
481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
484 static void iscsi_free_task(struct iscsi_task *task)
486 struct iscsi_conn *conn = task->conn;
487 struct iscsi_session *session = conn->session;
488 struct scsi_cmnd *sc = task->sc;
489 int oldstate = task->state;
491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
492 task->itt, task->state, task->sc);
494 session->tt->cleanup_task(task);
495 task->state = ISCSI_TASK_FREE;
498 * login task is preallocated so do not free
500 if (conn->login_task == task)
503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
506 /* SCSI eh reuses commands to verify us */
509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
517 void __iscsi_get_task(struct iscsi_task *task)
519 atomic_inc(&task->refcount);
521 EXPORT_SYMBOL_GPL(__iscsi_get_task);
523 void __iscsi_put_task(struct iscsi_task *task)
525 if (atomic_dec_and_test(&task->refcount))
526 iscsi_free_task(task);
528 EXPORT_SYMBOL_GPL(__iscsi_put_task);
530 void iscsi_put_task(struct iscsi_task *task)
532 struct iscsi_session *session = task->conn->session;
534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session->back_lock);
536 __iscsi_put_task(task);
537 spin_unlock_bh(&session->back_lock);
539 EXPORT_SYMBOL_GPL(iscsi_put_task);
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
544 * @state: state to complete task with
546 * Must be called with session back_lock.
548 static void iscsi_complete_task(struct iscsi_task *task, int state)
550 struct iscsi_conn *conn = task->conn;
552 ISCSI_DBG_SESSION(conn->session,
553 "complete task itt 0x%x state %d sc %p\n",
554 task->itt, task->state, task->sc);
555 if (task->state == ISCSI_TASK_COMPLETED ||
556 task->state == ISCSI_TASK_ABRT_TMF ||
557 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
558 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
563 if (!list_empty(&task->running))
564 list_del_init(&task->running);
566 if (conn->task == task)
569 if (conn->ping_task == task)
570 conn->ping_task = NULL;
572 /* release get from queueing */
573 __iscsi_put_task(task);
577 * iscsi_complete_scsi_task - finish scsi task normally
578 * @task: iscsi task for scsi cmd
579 * @exp_cmdsn: expected cmd sn in cpu format
580 * @max_cmdsn: max cmd sn in cpu format
582 * This is used when drivers do not need or cannot perform
583 * lower level pdu processing.
585 * Called with session back_lock
587 void iscsi_complete_scsi_task(struct iscsi_task *task,
588 uint32_t exp_cmdsn, uint32_t max_cmdsn)
590 struct iscsi_conn *conn = task->conn;
592 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
594 conn->last_recv = jiffies;
595 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
596 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
598 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
602 * session back_lock must be held and if not called for a task that is
603 * still pending or from the xmit thread, then xmit thread must
606 static void fail_scsi_task(struct iscsi_task *task, int err)
608 struct iscsi_conn *conn = task->conn;
609 struct scsi_cmnd *sc;
613 * if a command completes and we get a successful tmf response
614 * we will hit this because the scsi eh abort code does not take
621 if (task->state == ISCSI_TASK_PENDING) {
623 * cmd never made it to the xmit thread, so we should not count
624 * the cmd in the sequencing
626 conn->session->queued_cmdsn--;
627 /* it was never sent so just complete like normal */
628 state = ISCSI_TASK_COMPLETED;
629 } else if (err == DID_TRANSPORT_DISRUPTED)
630 state = ISCSI_TASK_ABRT_SESS_RECOV;
632 state = ISCSI_TASK_ABRT_TMF;
634 sc->result = err << 16;
635 if (!scsi_bidi_cmnd(sc))
636 scsi_set_resid(sc, scsi_bufflen(sc));
638 scsi_out(sc)->resid = scsi_out(sc)->length;
639 scsi_in(sc)->resid = scsi_in(sc)->length;
642 /* regular RX path uses back_lock */
643 spin_lock_bh(&conn->session->back_lock);
644 iscsi_complete_task(task, state);
645 spin_unlock_bh(&conn->session->back_lock);
648 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
649 struct iscsi_task *task)
651 struct iscsi_session *session = conn->session;
652 struct iscsi_hdr *hdr = task->hdr;
653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
662 * pre-format CmdSN for outgoing PDU.
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
667 * TODO: We always use immediate for normal session pdus.
668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
674 if (conn->c_stage == ISCSI_CONN_STARTED &&
675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
676 session->queued_cmdsn++;
681 if (session->tt->init_task && session->tt->init_task(task))
684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
685 session->state = ISCSI_STATE_LOGGING_OUT;
687 task->state = ISCSI_TASK_RUNNING;
688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
690 hdr->itt, task->data_count);
694 static struct iscsi_task *
695 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
696 char *data, uint32_t data_size)
698 struct iscsi_session *session = conn->session;
699 struct iscsi_host *ihost = shost_priv(session->host);
700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
701 struct iscsi_task *task;
704 if (session->state == ISCSI_STATE_TERMINATE)
707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
709 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
714 if (conn->login_task->state != ISCSI_TASK_FREE) {
715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
716 "progress. Cannot start new task.\n");
720 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
721 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);
725 task = conn->login_task;
727 if (session->state != ISCSI_STATE_LOGGED_IN)
730 if (data_size != 0) {
731 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
735 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
736 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
738 if (!kfifo_out(&session->cmdpool.queue,
739 (void*)&task, sizeof(void*)))
743 * released in complete pdu for task we expect a response for, and
744 * released by the lld when it has transmitted the task for
745 * pdus we do not expect a response for.
747 atomic_set(&task->refcount, 1);
750 INIT_LIST_HEAD(&task->running);
751 task->state = ISCSI_TASK_PENDING;
754 memcpy(task->data, data, data_size);
755 task->data_count = data_size;
757 task->data_count = 0;
759 if (conn->session->tt->alloc_pdu) {
760 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
761 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
762 "pdu for mgmt task.\n");
767 itt = task->hdr->itt;
768 task->hdr_len = sizeof(struct iscsi_hdr);
769 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
771 if (hdr->itt != RESERVED_ITT) {
772 if (session->tt->parse_pdu_itt)
773 task->hdr->itt = itt;
775 task->hdr->itt = build_itt(task->itt,
776 task->conn->session->age);
780 if (iscsi_prep_mgmt_task(conn, task))
783 if (session->tt->xmit_task(task))
786 list_add_tail(&task->running, &conn->mgmtqueue);
787 iscsi_conn_queue_work(conn);
793 /* regular RX path uses back_lock */
794 spin_lock_bh(&session->back_lock);
795 __iscsi_put_task(task);
796 spin_unlock_bh(&session->back_lock);
800 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
801 char *data, uint32_t data_size)
803 struct iscsi_conn *conn = cls_conn->dd_data;
804 struct iscsi_session *session = conn->session;
807 spin_lock_bh(&session->frwd_lock);
808 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
810 spin_unlock_bh(&session->frwd_lock);
813 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
816 * iscsi_cmd_rsp - SCSI Command Response processing
817 * @conn: iscsi connection
819 * @task: scsi command task
820 * @data: cmd data buffer
821 * @datalen: len of buffer
823 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
824 * then completes the command and task.
826 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
827 struct iscsi_task *task, char *data,
830 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
831 struct iscsi_session *session = conn->session;
832 struct scsi_cmnd *sc = task->sc;
834 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
835 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
837 sc->result = (DID_OK << 16) | rhdr->cmd_status;
839 if (task->protected) {
844 * Transports that didn't implement check_protection
845 * callback but still published T10-PI support to scsi-mid
846 * deserve this BUG_ON.
848 BUG_ON(!session->tt->check_protection);
850 ascq = session->tt->check_protection(task, §or);
852 sc->result = DRIVER_SENSE << 24 |
853 SAM_STAT_CHECK_CONDITION;
854 scsi_build_sense_buffer(1, sc->sense_buffer,
855 ILLEGAL_REQUEST, 0x10, ascq);
856 scsi_set_sense_information(sc->sense_buffer,
857 SCSI_SENSE_BUFFERSIZE,
863 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
864 sc->result = DID_ERROR << 16;
868 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
873 iscsi_conn_printk(KERN_ERR, conn,
874 "Got CHECK_CONDITION but invalid data "
875 "buffer size of %d\n", datalen);
876 sc->result = DID_BAD_TARGET << 16;
880 senselen = get_unaligned_be16(data);
881 if (datalen < senselen)
882 goto invalid_datalen;
884 memcpy(sc->sense_buffer, data + 2,
885 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
886 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
887 min_t(uint16_t, senselen,
888 SCSI_SENSE_BUFFERSIZE));
891 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
892 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
893 int res_count = be32_to_cpu(rhdr->bi_residual_count);
895 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
896 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
897 res_count <= scsi_in(sc)->length))
898 scsi_in(sc)->resid = res_count;
900 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
903 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
904 ISCSI_FLAG_CMD_OVERFLOW)) {
905 int res_count = be32_to_cpu(rhdr->residual_count);
908 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
909 res_count <= scsi_bufflen(sc)))
910 /* write side for bidi or uni-io set_resid */
911 scsi_set_resid(sc, res_count);
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
916 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
917 sc, sc->result, task->itt);
918 conn->scsirsp_pdus_cnt++;
919 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
923 * iscsi_data_in_rsp - SCSI Data-In Response processing
924 * @conn: iscsi connection
926 * @task: scsi command task
929 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
930 struct iscsi_task *task)
932 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
933 struct scsi_cmnd *sc = task->sc;
935 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
938 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
939 sc->result = (DID_OK << 16) | rhdr->cmd_status;
940 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
941 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
942 ISCSI_FLAG_DATA_OVERFLOW)) {
943 int res_count = be32_to_cpu(rhdr->residual_count);
946 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
947 res_count <= scsi_in(sc)->length))
948 scsi_in(sc)->resid = res_count;
950 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
953 ISCSI_DBG_SESSION(conn->session, "data in with status done "
954 "[sc %p res %d itt 0x%x]\n",
955 sc, sc->result, task->itt);
956 conn->scsirsp_pdus_cnt++;
957 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
960 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
962 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
964 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
965 conn->tmfrsp_pdus_cnt++;
967 if (conn->tmf_state != TMF_QUEUED)
970 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
971 conn->tmf_state = TMF_SUCCESS;
972 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
973 conn->tmf_state = TMF_NOT_FOUND;
975 conn->tmf_state = TMF_FAILED;
976 wake_up(&conn->ehwait);
979 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
981 struct iscsi_nopout hdr;
982 struct iscsi_task *task;
984 if (!rhdr && conn->ping_task)
987 memset(&hdr, 0, sizeof(struct iscsi_nopout));
988 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
989 hdr.flags = ISCSI_FLAG_CMD_FINAL;
994 hdr.itt = RESERVED_ITT;
996 hdr.ttt = RESERVED_ITT;
998 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
1000 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1002 /* only track our nops */
1003 conn->ping_task = task;
1004 conn->last_ping = jiffies;
1008 static int iscsi_nop_out_rsp(struct iscsi_task *task,
1009 struct iscsi_nopin *nop, char *data, int datalen)
1011 struct iscsi_conn *conn = task->conn;
1014 if (conn->ping_task != task) {
1016 * If this is not in response to one of our
1017 * nops then it must be from userspace.
1019 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1021 rc = ISCSI_ERR_CONN_FAILED;
1023 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1024 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1028 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1029 char *data, int datalen)
1031 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1032 struct iscsi_hdr rejected_pdu;
1035 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1037 if (ntoh24(reject->dlength) > datalen ||
1038 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1039 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1040 "pdu. Invalid data length (pdu dlength "
1041 "%u, datalen %d\n", ntoh24(reject->dlength),
1043 return ISCSI_ERR_PROTO;
1045 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1046 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1048 switch (reject->reason) {
1049 case ISCSI_REASON_DATA_DIGEST_ERROR:
1050 iscsi_conn_printk(KERN_ERR, conn,
1051 "pdu (op 0x%x itt 0x%x) rejected "
1052 "due to DataDigest error.\n",
1053 opcode, rejected_pdu.itt);
1055 case ISCSI_REASON_IMM_CMD_REJECT:
1056 iscsi_conn_printk(KERN_ERR, conn,
1057 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1058 "immediate commands.\n",
1059 opcode, rejected_pdu.itt);
1061 * We only send one TMF at a time so if the target could not
1062 * handle it, then it should get fixed (RFC mandates that
1063 * a target can handle one immediate TMF per conn).
1065 * For nops-outs, we could have sent more than one if
1066 * the target is sending us lots of nop-ins
1068 if (opcode != ISCSI_OP_NOOP_OUT)
1071 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1073 * nop-out in response to target's nop-out rejected.
1076 /* In RX path we are under back lock */
1077 spin_unlock(&conn->session->back_lock);
1078 spin_lock(&conn->session->frwd_lock);
1079 iscsi_send_nopout(conn,
1080 (struct iscsi_nopin*)&rejected_pdu);
1081 spin_unlock(&conn->session->frwd_lock);
1082 spin_lock(&conn->session->back_lock);
1084 struct iscsi_task *task;
1086 * Our nop as ping got dropped. We know the target
1087 * and transport are ok so just clean up
1089 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1091 iscsi_conn_printk(KERN_ERR, conn,
1092 "Invalid pdu reject. Could "
1093 "not lookup rejected task.\n");
1094 rc = ISCSI_ERR_BAD_ITT;
1096 rc = iscsi_nop_out_rsp(task,
1097 (struct iscsi_nopin*)&rejected_pdu,
1102 iscsi_conn_printk(KERN_ERR, conn,
1103 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1104 "code 0x%x\n", rejected_pdu.opcode,
1105 rejected_pdu.itt, reject->reason);
1112 * iscsi_itt_to_task - look up task by itt
1113 * @conn: iscsi connection
1116 * This should be used for mgmt tasks like login and nops, or if
1117 * the LDD's itt space does not include the session age.
1119 * The session back_lock must be held.
1121 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1123 struct iscsi_session *session = conn->session;
1126 if (itt == RESERVED_ITT)
1129 if (session->tt->parse_pdu_itt)
1130 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1133 if (i >= session->cmds_max)
1136 return session->cmds[i];
1138 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1141 * __iscsi_complete_pdu - complete pdu
1143 * @hdr: iscsi header
1144 * @data: data buffer
1145 * @datalen: len of data buffer
1147 * Completes pdu processing by freeing any resources allocated at
1148 * queuecommand or send generic. session back_lock must be held and verify
1149 * itt must have been called.
1151 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1152 char *data, int datalen)
1154 struct iscsi_session *session = conn->session;
1155 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1156 struct iscsi_task *task;
1159 conn->last_recv = jiffies;
1160 rc = iscsi_verify_itt(conn, hdr->itt);
1164 if (hdr->itt != RESERVED_ITT)
1165 itt = get_itt(hdr->itt);
1169 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1170 opcode, conn->id, itt, datalen);
1173 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1176 case ISCSI_OP_NOOP_IN:
1178 rc = ISCSI_ERR_PROTO;
1182 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1185 /* In RX path we are under back lock */
1186 spin_unlock(&session->back_lock);
1187 spin_lock(&session->frwd_lock);
1188 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1189 spin_unlock(&session->frwd_lock);
1190 spin_lock(&session->back_lock);
1192 case ISCSI_OP_REJECT:
1193 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1195 case ISCSI_OP_ASYNC_EVENT:
1196 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1197 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1198 rc = ISCSI_ERR_CONN_FAILED;
1201 rc = ISCSI_ERR_BAD_OPCODE;
1208 case ISCSI_OP_SCSI_CMD_RSP:
1209 case ISCSI_OP_SCSI_DATA_IN:
1210 task = iscsi_itt_to_ctask(conn, hdr->itt);
1212 return ISCSI_ERR_BAD_ITT;
1213 task->last_xfer = jiffies;
1217 * LLD handles R2Ts if they need to.
1220 case ISCSI_OP_LOGOUT_RSP:
1221 case ISCSI_OP_LOGIN_RSP:
1222 case ISCSI_OP_TEXT_RSP:
1223 case ISCSI_OP_SCSI_TMFUNC_RSP:
1224 case ISCSI_OP_NOOP_IN:
1225 task = iscsi_itt_to_task(conn, hdr->itt);
1227 return ISCSI_ERR_BAD_ITT;
1230 return ISCSI_ERR_BAD_OPCODE;
1234 case ISCSI_OP_SCSI_CMD_RSP:
1235 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1237 case ISCSI_OP_SCSI_DATA_IN:
1238 iscsi_data_in_rsp(conn, hdr, task);
1240 case ISCSI_OP_LOGOUT_RSP:
1241 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1243 rc = ISCSI_ERR_PROTO;
1246 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1248 case ISCSI_OP_LOGIN_RSP:
1249 case ISCSI_OP_TEXT_RSP:
1250 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1252 * login related PDU's exp_statsn is handled in
1256 case ISCSI_OP_SCSI_TMFUNC_RSP:
1257 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1259 rc = ISCSI_ERR_PROTO;
1263 iscsi_tmf_rsp(conn, hdr);
1264 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1266 case ISCSI_OP_NOOP_IN:
1267 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1268 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1269 rc = ISCSI_ERR_PROTO;
1272 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1274 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1278 rc = ISCSI_ERR_BAD_OPCODE;
1285 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1286 rc = ISCSI_ERR_CONN_FAILED;
1287 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1290 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1292 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1293 char *data, int datalen)
1297 spin_lock(&conn->session->back_lock);
1298 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1299 spin_unlock(&conn->session->back_lock);
1302 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1304 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1306 struct iscsi_session *session = conn->session;
1309 if (itt == RESERVED_ITT)
1312 if (session->tt->parse_pdu_itt)
1313 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1316 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1319 if (age != session->age) {
1320 iscsi_conn_printk(KERN_ERR, conn,
1321 "received itt %x expected session age (%x)\n",
1322 (__force u32)itt, session->age);
1323 return ISCSI_ERR_BAD_ITT;
1326 if (i >= session->cmds_max) {
1327 iscsi_conn_printk(KERN_ERR, conn,
1328 "received invalid itt index %u (max cmds "
1329 "%u.\n", i, session->cmds_max);
1330 return ISCSI_ERR_BAD_ITT;
1334 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1337 * iscsi_itt_to_ctask - look up ctask by itt
1338 * @conn: iscsi connection
1341 * This should be used for cmd tasks.
1343 * The session back_lock must be held.
1345 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1347 struct iscsi_task *task;
1349 if (iscsi_verify_itt(conn, itt))
1352 task = iscsi_itt_to_task(conn, itt);
1353 if (!task || !task->sc)
1356 if (task->sc->SCp.phase != conn->session->age) {
1357 iscsi_session_printk(KERN_ERR, conn->session,
1358 "task's session age %d, expected %d\n",
1359 task->sc->SCp.phase, conn->session->age);
1365 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1367 void iscsi_session_failure(struct iscsi_session *session,
1370 struct iscsi_conn *conn;
1373 spin_lock_bh(&session->frwd_lock);
1374 conn = session->leadconn;
1375 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1376 spin_unlock_bh(&session->frwd_lock);
1380 dev = get_device(&conn->cls_conn->dev);
1381 spin_unlock_bh(&session->frwd_lock);
1385 * if the host is being removed bypass the connection
1386 * recovery initialization because we are going to kill
1389 if (err == ISCSI_ERR_INVALID_HOST)
1390 iscsi_conn_error_event(conn->cls_conn, err);
1392 iscsi_conn_failure(conn, err);
1395 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1397 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1399 struct iscsi_session *session = conn->session;
1401 spin_lock_bh(&session->frwd_lock);
1402 if (session->state == ISCSI_STATE_FAILED) {
1403 spin_unlock_bh(&session->frwd_lock);
1407 if (conn->stop_stage == 0)
1408 session->state = ISCSI_STATE_FAILED;
1409 spin_unlock_bh(&session->frwd_lock);
1411 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1412 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1413 iscsi_conn_error_event(conn->cls_conn, err);
1415 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1417 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1419 struct iscsi_session *session = conn->session;
1422 * Check for iSCSI window and take care of CmdSN wrap-around
1424 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1425 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1426 "%u MaxCmdSN %u CmdSN %u/%u\n",
1427 session->exp_cmdsn, session->max_cmdsn,
1428 session->cmdsn, session->queued_cmdsn);
1434 static int iscsi_xmit_task(struct iscsi_conn *conn)
1436 struct iscsi_task *task = conn->task;
1439 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1442 __iscsi_get_task(task);
1443 spin_unlock_bh(&conn->session->frwd_lock);
1444 rc = conn->session->tt->xmit_task(task);
1445 spin_lock_bh(&conn->session->frwd_lock);
1447 /* done with this task */
1448 task->last_xfer = jiffies;
1451 /* regular RX path uses back_lock */
1452 spin_lock(&conn->session->back_lock);
1453 __iscsi_put_task(task);
1454 spin_unlock(&conn->session->back_lock);
1459 * iscsi_requeue_task - requeue task to run from session workqueue
1460 * @task: task to requeue
1462 * LLDs that need to run a task from the session workqueue should call
1463 * this. The session frwd_lock must be held. This should only be called
1464 * by software drivers.
1466 void iscsi_requeue_task(struct iscsi_task *task)
1468 struct iscsi_conn *conn = task->conn;
1471 * this may be on the requeue list already if the xmit_task callout
1472 * is handling the r2ts while we are adding new ones
1474 if (list_empty(&task->running))
1475 list_add_tail(&task->running, &conn->requeue);
1476 iscsi_conn_queue_work(conn);
1478 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1481 * iscsi_data_xmit - xmit any command into the scheduled connection
1482 * @conn: iscsi connection
1485 * The function can return -EAGAIN in which case the caller must
1486 * re-schedule it again later or recover. '0' return code means
1489 static int iscsi_data_xmit(struct iscsi_conn *conn)
1491 struct iscsi_task *task;
1494 spin_lock_bh(&conn->session->frwd_lock);
1495 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1496 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1497 spin_unlock_bh(&conn->session->frwd_lock);
1502 rc = iscsi_xmit_task(conn);
1508 * process mgmt pdus like nops before commands since we should
1509 * only have one nop-out as a ping from us and targets should not
1510 * overflow us with nop-ins
1513 while (!list_empty(&conn->mgmtqueue)) {
1514 conn->task = list_entry(conn->mgmtqueue.next,
1515 struct iscsi_task, running);
1516 list_del_init(&conn->task->running);
1517 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1518 /* regular RX path uses back_lock */
1519 spin_lock_bh(&conn->session->back_lock);
1520 __iscsi_put_task(conn->task);
1521 spin_unlock_bh(&conn->session->back_lock);
1525 rc = iscsi_xmit_task(conn);
1530 /* process pending command queue */
1531 while (!list_empty(&conn->cmdqueue)) {
1532 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1534 list_del_init(&conn->task->running);
1535 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1536 fail_scsi_task(conn->task, DID_IMM_RETRY);
1539 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1541 if (rc == -ENOMEM || rc == -EACCES) {
1542 list_add_tail(&conn->task->running,
1547 fail_scsi_task(conn->task, DID_ABORT);
1550 rc = iscsi_xmit_task(conn);
1554 * we could continuously get new task requests so
1555 * we need to check the mgmt queue for nops that need to
1556 * be sent to aviod starvation
1558 if (!list_empty(&conn->mgmtqueue))
1562 while (!list_empty(&conn->requeue)) {
1564 * we always do fastlogout - conn stop code will clean up.
1566 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1569 task = list_entry(conn->requeue.next, struct iscsi_task,
1571 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1575 list_del_init(&conn->task->running);
1576 conn->task->state = ISCSI_TASK_RUNNING;
1577 rc = iscsi_xmit_task(conn);
1580 if (!list_empty(&conn->mgmtqueue))
1583 spin_unlock_bh(&conn->session->frwd_lock);
1587 spin_unlock_bh(&conn->session->frwd_lock);
1591 static void iscsi_xmitworker(struct work_struct *work)
1593 struct iscsi_conn *conn =
1594 container_of(work, struct iscsi_conn, xmitwork);
1597 * serialize Xmit worker on a per-connection basis.
1600 rc = iscsi_data_xmit(conn);
1601 } while (rc >= 0 || rc == -EAGAIN);
1604 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1605 struct scsi_cmnd *sc)
1607 struct iscsi_task *task;
1609 if (!kfifo_out(&conn->session->cmdpool.queue,
1610 (void *) &task, sizeof(void *)))
1613 sc->SCp.phase = conn->session->age;
1614 sc->SCp.ptr = (char *) task;
1616 atomic_set(&task->refcount, 1);
1617 task->state = ISCSI_TASK_PENDING;
1620 task->have_checked_conn = false;
1621 task->last_timeout = jiffies;
1622 task->last_xfer = jiffies;
1623 task->protected = false;
1624 INIT_LIST_HEAD(&task->running);
1629 FAILURE_BAD_HOST = 1,
1630 FAILURE_SESSION_FAILED,
1631 FAILURE_SESSION_FREED,
1632 FAILURE_WINDOW_CLOSED,
1634 FAILURE_SESSION_TERMINATE,
1635 FAILURE_SESSION_IN_RECOVERY,
1636 FAILURE_SESSION_RECOVERY_TIMEOUT,
1637 FAILURE_SESSION_LOGGING_OUT,
1638 FAILURE_SESSION_NOT_READY,
1641 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1643 struct iscsi_cls_session *cls_session;
1644 struct iscsi_host *ihost;
1646 struct iscsi_session *session;
1647 struct iscsi_conn *conn;
1648 struct iscsi_task *task = NULL;
1653 ihost = shost_priv(host);
1655 cls_session = starget_to_session(scsi_target(sc->device));
1656 session = cls_session->dd_data;
1657 spin_lock_bh(&session->frwd_lock);
1659 reason = iscsi_session_chkready(cls_session);
1661 sc->result = reason;
1665 if (session->state != ISCSI_STATE_LOGGED_IN) {
1667 * to handle the race between when we set the recovery state
1668 * and block the session we requeue here (commands could
1669 * be entering our queuecommand while a block is starting
1670 * up because the block code is not locked)
1672 switch (session->state) {
1673 case ISCSI_STATE_FAILED:
1674 case ISCSI_STATE_IN_RECOVERY:
1675 reason = FAILURE_SESSION_IN_RECOVERY;
1676 sc->result = DID_IMM_RETRY << 16;
1678 case ISCSI_STATE_LOGGING_OUT:
1679 reason = FAILURE_SESSION_LOGGING_OUT;
1680 sc->result = DID_IMM_RETRY << 16;
1682 case ISCSI_STATE_RECOVERY_FAILED:
1683 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1684 sc->result = DID_TRANSPORT_FAILFAST << 16;
1686 case ISCSI_STATE_TERMINATE:
1687 reason = FAILURE_SESSION_TERMINATE;
1688 sc->result = DID_NO_CONNECT << 16;
1691 reason = FAILURE_SESSION_FREED;
1692 sc->result = DID_NO_CONNECT << 16;
1697 conn = session->leadconn;
1699 reason = FAILURE_SESSION_FREED;
1700 sc->result = DID_NO_CONNECT << 16;
1704 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1705 reason = FAILURE_SESSION_IN_RECOVERY;
1706 sc->result = DID_REQUEUE;
1710 if (iscsi_check_cmdsn_window_closed(conn)) {
1711 reason = FAILURE_WINDOW_CLOSED;
1715 task = iscsi_alloc_task(conn, sc);
1717 reason = FAILURE_OOM;
1721 if (!ihost->workq) {
1722 reason = iscsi_prep_scsi_cmd_pdu(task);
1724 if (reason == -ENOMEM || reason == -EACCES) {
1725 reason = FAILURE_OOM;
1728 sc->result = DID_ABORT << 16;
1732 if (session->tt->xmit_task(task)) {
1734 reason = FAILURE_SESSION_NOT_READY;
1738 list_add_tail(&task->running, &conn->cmdqueue);
1739 iscsi_conn_queue_work(conn);
1742 session->queued_cmdsn++;
1743 spin_unlock_bh(&session->frwd_lock);
1747 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1749 spin_unlock_bh(&session->frwd_lock);
1750 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1751 sc->cmnd[0], reason);
1752 return SCSI_MLQUEUE_TARGET_BUSY;
1755 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1757 spin_unlock_bh(&session->frwd_lock);
1758 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1759 sc->cmnd[0], reason);
1760 if (!scsi_bidi_cmnd(sc))
1761 scsi_set_resid(sc, scsi_bufflen(sc));
1763 scsi_out(sc)->resid = scsi_out(sc)->length;
1764 scsi_in(sc)->resid = scsi_in(sc)->length;
1769 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1771 int iscsi_target_alloc(struct scsi_target *starget)
1773 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1774 struct iscsi_session *session = cls_session->dd_data;
1776 starget->can_queue = session->scsi_cmds_max;
1779 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1781 static void iscsi_tmf_timedout(unsigned long data)
1783 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1784 struct iscsi_session *session = conn->session;
1786 spin_lock(&session->frwd_lock);
1787 if (conn->tmf_state == TMF_QUEUED) {
1788 conn->tmf_state = TMF_TIMEDOUT;
1789 ISCSI_DBG_EH(session, "tmf timedout\n");
1790 /* unblock eh_abort() */
1791 wake_up(&conn->ehwait);
1793 spin_unlock(&session->frwd_lock);
1796 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1797 struct iscsi_tm *hdr, int age,
1800 struct iscsi_session *session = conn->session;
1801 struct iscsi_task *task;
1803 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1806 spin_unlock_bh(&session->frwd_lock);
1807 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1808 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1809 spin_lock_bh(&session->frwd_lock);
1812 conn->tmfcmd_pdus_cnt++;
1813 conn->tmf_timer.expires = timeout * HZ + jiffies;
1814 conn->tmf_timer.function = iscsi_tmf_timedout;
1815 conn->tmf_timer.data = (unsigned long)conn;
1816 add_timer(&conn->tmf_timer);
1817 ISCSI_DBG_EH(session, "tmf set timeout\n");
1819 spin_unlock_bh(&session->frwd_lock);
1820 mutex_unlock(&session->eh_mutex);
1823 * block eh thread until:
1827 * 3) session is terminated or restarted or userspace has
1828 * given up on recovery
1830 wait_event_interruptible(conn->ehwait, age != session->age ||
1831 session->state != ISCSI_STATE_LOGGED_IN ||
1832 conn->tmf_state != TMF_QUEUED);
1833 if (signal_pending(current))
1834 flush_signals(current);
1835 del_timer_sync(&conn->tmf_timer);
1837 mutex_lock(&session->eh_mutex);
1838 spin_lock_bh(&session->frwd_lock);
1839 /* if the session drops it will clean up the task */
1840 if (age != session->age ||
1841 session->state != ISCSI_STATE_LOGGED_IN)
1847 * Fail commands. session lock held and recv side suspended and xmit
1850 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1852 struct iscsi_task *task;
1855 for (i = 0; i < conn->session->cmds_max; i++) {
1856 task = conn->session->cmds[i];
1857 if (!task->sc || task->state == ISCSI_TASK_FREE)
1860 if (lun != -1 && lun != task->sc->device->lun)
1863 ISCSI_DBG_SESSION(conn->session,
1864 "failing sc %p itt 0x%x state %d\n",
1865 task->sc, task->itt, task->state);
1866 fail_scsi_task(task, error);
1871 * iscsi_suspend_queue - suspend iscsi_queuecommand
1872 * @conn: iscsi conn to stop queueing IO on
1874 * This grabs the session frwd_lock to make sure no one is in
1875 * xmit_task/queuecommand, and then sets suspend to prevent
1876 * new commands from being queued. This only needs to be called
1877 * by offload drivers that need to sync a path like ep disconnect
1878 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1879 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1881 void iscsi_suspend_queue(struct iscsi_conn *conn)
1883 spin_lock_bh(&conn->session->frwd_lock);
1884 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1885 spin_unlock_bh(&conn->session->frwd_lock);
1887 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1890 * iscsi_suspend_tx - suspend iscsi_data_xmit
1891 * @conn: iscsi conn tp stop processing IO on.
1893 * This function sets the suspend bit to prevent iscsi_data_xmit
1894 * from sending new IO, and if work is queued on the xmit thread
1895 * it will wait for it to be completed.
1897 void iscsi_suspend_tx(struct iscsi_conn *conn)
1899 struct Scsi_Host *shost = conn->session->host;
1900 struct iscsi_host *ihost = shost_priv(shost);
1902 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1904 flush_workqueue(ihost->workq);
1906 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1908 static void iscsi_start_tx(struct iscsi_conn *conn)
1910 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1911 iscsi_conn_queue_work(conn);
1915 * We want to make sure a ping is in flight. It has timed out.
1916 * And we are not busy processing a pdu that is making
1917 * progress but got started before the ping and is taking a while
1918 * to complete so the ping is just stuck behind it in a queue.
1920 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1922 if (conn->ping_task &&
1923 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1924 (conn->ping_timeout * HZ), jiffies))
1930 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1932 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1933 struct iscsi_task *task = NULL, *running_task;
1934 struct iscsi_cls_session *cls_session;
1935 struct iscsi_session *session;
1936 struct iscsi_conn *conn;
1939 cls_session = starget_to_session(scsi_target(sc->device));
1940 session = cls_session->dd_data;
1942 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1944 spin_lock(&session->frwd_lock);
1945 task = (struct iscsi_task *)sc->SCp.ptr;
1948 * Raced with completion. Blk layer has taken ownership
1949 * so let timeout code complete it now.
1951 rc = BLK_EH_HANDLED;
1955 if (session->state != ISCSI_STATE_LOGGED_IN) {
1957 * We are probably in the middle of iscsi recovery so let
1958 * that complete and handle the error.
1960 rc = BLK_EH_RESET_TIMER;
1964 conn = session->leadconn;
1966 /* In the middle of shuting down */
1967 rc = BLK_EH_RESET_TIMER;
1972 * If we have sent (at least queued to the network layer) a pdu or
1973 * recvd one for the task since the last timeout ask for
1974 * more time. If on the next timeout we have not made progress
1975 * we can check if it is the task or connection when we send the
1978 if (time_after(task->last_xfer, task->last_timeout)) {
1979 ISCSI_DBG_EH(session, "Command making progress. Asking "
1980 "scsi-ml for more time to complete. "
1981 "Last data xfer at %lu. Last timeout was at "
1982 "%lu\n.", task->last_xfer, task->last_timeout);
1983 task->have_checked_conn = false;
1984 rc = BLK_EH_RESET_TIMER;
1988 if (!conn->recv_timeout && !conn->ping_timeout)
1991 * if the ping timedout then we are in the middle of cleaning up
1992 * and can let the iscsi eh handle it
1994 if (iscsi_has_ping_timed_out(conn)) {
1995 rc = BLK_EH_RESET_TIMER;
1999 for (i = 0; i < conn->session->cmds_max; i++) {
2000 running_task = conn->session->cmds[i];
2001 if (!running_task->sc || running_task == task ||
2002 running_task->state != ISCSI_TASK_RUNNING)
2006 * Only check if cmds started before this one have made
2007 * progress, or this could never fail
2009 if (time_after(running_task->sc->jiffies_at_alloc,
2010 task->sc->jiffies_at_alloc))
2013 if (time_after(running_task->last_xfer, task->last_timeout)) {
2015 * This task has not made progress, but a task
2016 * started before us has transferred data since
2017 * we started/last-checked. We could be queueing
2018 * too many tasks or the LU is bad.
2020 * If the device is bad the cmds ahead of us on
2021 * other devs will complete, and this loop will
2022 * eventually fail starting the scsi eh.
2024 ISCSI_DBG_EH(session, "Command has not made progress "
2025 "but commands ahead of it have. "
2026 "Asking scsi-ml for more time to "
2027 "complete. Our last xfer vs running task "
2028 "last xfer %lu/%lu. Last check %lu.\n",
2029 task->last_xfer, running_task->last_xfer,
2030 task->last_timeout);
2031 rc = BLK_EH_RESET_TIMER;
2036 /* Assumes nop timeout is shorter than scsi cmd timeout */
2037 if (task->have_checked_conn)
2041 * Checking the transport already or nop from a cmd timeout still
2044 if (conn->ping_task) {
2045 task->have_checked_conn = true;
2046 rc = BLK_EH_RESET_TIMER;
2050 /* Make sure there is a transport check done */
2051 iscsi_send_nopout(conn, NULL);
2052 task->have_checked_conn = true;
2053 rc = BLK_EH_RESET_TIMER;
2057 task->last_timeout = jiffies;
2058 spin_unlock(&session->frwd_lock);
2059 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2060 "timer reset" : "nh");
2064 static void iscsi_check_transport_timeouts(unsigned long data)
2066 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2067 struct iscsi_session *session = conn->session;
2068 unsigned long recv_timeout, next_timeout = 0, last_recv;
2070 spin_lock(&session->frwd_lock);
2071 if (session->state != ISCSI_STATE_LOGGED_IN)
2074 recv_timeout = conn->recv_timeout;
2079 last_recv = conn->last_recv;
2081 if (iscsi_has_ping_timed_out(conn)) {
2082 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2083 "expired, recv timeout %d, last rx %lu, "
2084 "last ping %lu, now %lu\n",
2085 conn->ping_timeout, conn->recv_timeout,
2086 last_recv, conn->last_ping, jiffies);
2087 spin_unlock(&session->frwd_lock);
2088 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2092 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2093 /* send a ping to try to provoke some traffic */
2094 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2095 iscsi_send_nopout(conn, NULL);
2096 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2098 next_timeout = last_recv + recv_timeout;
2100 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2101 mod_timer(&conn->transport_timer, next_timeout);
2103 spin_unlock(&session->frwd_lock);
2106 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2107 struct iscsi_tm *hdr)
2109 memset(hdr, 0, sizeof(*hdr));
2110 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2111 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2112 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2113 hdr->lun = task->lun;
2114 hdr->rtt = task->hdr_itt;
2115 hdr->refcmdsn = task->cmdsn;
2118 int iscsi_eh_abort(struct scsi_cmnd *sc)
2120 struct iscsi_cls_session *cls_session;
2121 struct iscsi_session *session;
2122 struct iscsi_conn *conn;
2123 struct iscsi_task *task;
2124 struct iscsi_tm *hdr;
2127 cls_session = starget_to_session(scsi_target(sc->device));
2128 session = cls_session->dd_data;
2130 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2132 mutex_lock(&session->eh_mutex);
2133 spin_lock_bh(&session->frwd_lock);
2135 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2139 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2141 spin_unlock_bh(&session->frwd_lock);
2142 mutex_unlock(&session->eh_mutex);
2147 * If we are not logged in or we have started a new session
2148 * then let the host reset code handle this
2150 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2151 sc->SCp.phase != session->age) {
2152 spin_unlock_bh(&session->frwd_lock);
2153 mutex_unlock(&session->eh_mutex);
2154 ISCSI_DBG_EH(session, "failing abort due to dropped "
2159 conn = session->leadconn;
2160 conn->eh_abort_cnt++;
2163 task = (struct iscsi_task *)sc->SCp.ptr;
2164 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2167 /* task completed before time out */
2169 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2173 if (task->state == ISCSI_TASK_PENDING) {
2174 fail_scsi_task(task, DID_ABORT);
2178 /* only have one tmf outstanding at a time */
2179 if (conn->tmf_state != TMF_INITIAL)
2181 conn->tmf_state = TMF_QUEUED;
2184 iscsi_prep_abort_task_pdu(task, hdr);
2186 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2191 switch (conn->tmf_state) {
2193 spin_unlock_bh(&session->frwd_lock);
2195 * stop tx side incase the target had sent a abort rsp but
2196 * the initiator was still writing out data.
2198 iscsi_suspend_tx(conn);
2200 * we do not stop the recv side because targets have been
2201 * good and have never sent us a successful tmf response
2202 * then sent more data for the cmd.
2204 spin_lock_bh(&session->frwd_lock);
2205 fail_scsi_task(task, DID_ABORT);
2206 conn->tmf_state = TMF_INITIAL;
2207 memset(hdr, 0, sizeof(*hdr));
2208 spin_unlock_bh(&session->frwd_lock);
2209 iscsi_start_tx(conn);
2210 goto success_unlocked;
2212 spin_unlock_bh(&session->frwd_lock);
2213 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2214 goto failed_unlocked;
2217 conn->tmf_state = TMF_INITIAL;
2218 memset(hdr, 0, sizeof(*hdr));
2219 /* task completed before tmf abort response */
2220 ISCSI_DBG_EH(session, "sc completed while abort in "
2226 conn->tmf_state = TMF_INITIAL;
2231 spin_unlock_bh(&session->frwd_lock);
2233 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2235 mutex_unlock(&session->eh_mutex);
2239 spin_unlock_bh(&session->frwd_lock);
2241 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2242 task ? task->itt : 0);
2243 mutex_unlock(&session->eh_mutex);
2246 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2248 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2250 memset(hdr, 0, sizeof(*hdr));
2251 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2252 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2253 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2254 int_to_scsilun(sc->device->lun, &hdr->lun);
2255 hdr->rtt = RESERVED_ITT;
2258 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2260 struct iscsi_cls_session *cls_session;
2261 struct iscsi_session *session;
2262 struct iscsi_conn *conn;
2263 struct iscsi_tm *hdr;
2266 cls_session = starget_to_session(scsi_target(sc->device));
2267 session = cls_session->dd_data;
2269 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2272 mutex_lock(&session->eh_mutex);
2273 spin_lock_bh(&session->frwd_lock);
2275 * Just check if we are not logged in. We cannot check for
2276 * the phase because the reset could come from a ioctl.
2278 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2280 conn = session->leadconn;
2282 /* only have one tmf outstanding at a time */
2283 if (conn->tmf_state != TMF_INITIAL)
2285 conn->tmf_state = TMF_QUEUED;
2288 iscsi_prep_lun_reset_pdu(sc, hdr);
2290 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2291 session->lu_reset_timeout)) {
2296 switch (conn->tmf_state) {
2300 spin_unlock_bh(&session->frwd_lock);
2301 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2304 conn->tmf_state = TMF_INITIAL;
2309 spin_unlock_bh(&session->frwd_lock);
2311 iscsi_suspend_tx(conn);
2313 spin_lock_bh(&session->frwd_lock);
2314 memset(hdr, 0, sizeof(*hdr));
2315 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2316 conn->tmf_state = TMF_INITIAL;
2317 spin_unlock_bh(&session->frwd_lock);
2319 iscsi_start_tx(conn);
2323 spin_unlock_bh(&session->frwd_lock);
2325 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2326 rc == SUCCESS ? "SUCCESS" : "FAILED");
2327 mutex_unlock(&session->eh_mutex);
2330 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2332 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2334 struct iscsi_session *session = cls_session->dd_data;
2336 spin_lock_bh(&session->frwd_lock);
2337 if (session->state != ISCSI_STATE_LOGGED_IN) {
2338 session->state = ISCSI_STATE_RECOVERY_FAILED;
2339 if (session->leadconn)
2340 wake_up(&session->leadconn->ehwait);
2342 spin_unlock_bh(&session->frwd_lock);
2344 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2347 * iscsi_eh_session_reset - drop session and attempt relogin
2350 * This function will wait for a relogin, session termination from
2351 * userspace, or a recovery/replacement timeout.
2353 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2355 struct iscsi_cls_session *cls_session;
2356 struct iscsi_session *session;
2357 struct iscsi_conn *conn;
2359 cls_session = starget_to_session(scsi_target(sc->device));
2360 session = cls_session->dd_data;
2361 conn = session->leadconn;
2363 mutex_lock(&session->eh_mutex);
2364 spin_lock_bh(&session->frwd_lock);
2365 if (session->state == ISCSI_STATE_TERMINATE) {
2367 ISCSI_DBG_EH(session,
2368 "failing session reset: Could not log back into "
2369 "%s, %s [age %d]\n", session->targetname,
2370 conn->persistent_address, session->age);
2371 spin_unlock_bh(&session->frwd_lock);
2372 mutex_unlock(&session->eh_mutex);
2376 spin_unlock_bh(&session->frwd_lock);
2377 mutex_unlock(&session->eh_mutex);
2379 * we drop the lock here but the leadconn cannot be destoyed while
2380 * we are in the scsi eh
2382 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2384 ISCSI_DBG_EH(session, "wait for relogin\n");
2385 wait_event_interruptible(conn->ehwait,
2386 session->state == ISCSI_STATE_TERMINATE ||
2387 session->state == ISCSI_STATE_LOGGED_IN ||
2388 session->state == ISCSI_STATE_RECOVERY_FAILED);
2389 if (signal_pending(current))
2390 flush_signals(current);
2392 mutex_lock(&session->eh_mutex);
2393 spin_lock_bh(&session->frwd_lock);
2394 if (session->state == ISCSI_STATE_LOGGED_IN) {
2395 ISCSI_DBG_EH(session,
2396 "session reset succeeded for %s,%s\n",
2397 session->targetname, conn->persistent_address);
2400 spin_unlock_bh(&session->frwd_lock);
2401 mutex_unlock(&session->eh_mutex);
2404 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2406 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2408 memset(hdr, 0, sizeof(*hdr));
2409 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2410 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2411 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2412 hdr->rtt = RESERVED_ITT;
2416 * iscsi_eh_target_reset - reset target
2419 * This will attempt to send a warm target reset.
2421 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2423 struct iscsi_cls_session *cls_session;
2424 struct iscsi_session *session;
2425 struct iscsi_conn *conn;
2426 struct iscsi_tm *hdr;
2429 cls_session = starget_to_session(scsi_target(sc->device));
2430 session = cls_session->dd_data;
2432 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2433 session->targetname);
2435 mutex_lock(&session->eh_mutex);
2436 spin_lock_bh(&session->frwd_lock);
2438 * Just check if we are not logged in. We cannot check for
2439 * the phase because the reset could come from a ioctl.
2441 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2443 conn = session->leadconn;
2445 /* only have one tmf outstanding at a time */
2446 if (conn->tmf_state != TMF_INITIAL)
2448 conn->tmf_state = TMF_QUEUED;
2451 iscsi_prep_tgt_reset_pdu(sc, hdr);
2453 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2454 session->tgt_reset_timeout)) {
2459 switch (conn->tmf_state) {
2463 spin_unlock_bh(&session->frwd_lock);
2464 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2467 conn->tmf_state = TMF_INITIAL;
2472 spin_unlock_bh(&session->frwd_lock);
2474 iscsi_suspend_tx(conn);
2476 spin_lock_bh(&session->frwd_lock);
2477 memset(hdr, 0, sizeof(*hdr));
2478 fail_scsi_tasks(conn, -1, DID_ERROR);
2479 conn->tmf_state = TMF_INITIAL;
2480 spin_unlock_bh(&session->frwd_lock);
2482 iscsi_start_tx(conn);
2486 spin_unlock_bh(&session->frwd_lock);
2488 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2489 rc == SUCCESS ? "SUCCESS" : "FAILED");
2490 mutex_unlock(&session->eh_mutex);
2493 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2496 * iscsi_eh_recover_target - reset target and possibly the session
2499 * This will attempt to send a warm target reset. If that fails,
2500 * we will escalate to ERL0 session recovery.
2502 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2506 rc = iscsi_eh_target_reset(sc);
2508 rc = iscsi_eh_session_reset(sc);
2511 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2514 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2515 * should be accessed via kfifo_{get,put} on q->queue.
2516 * Optionally, the caller can obtain the array of object pointers
2517 * by passing in a non-NULL @items pointer
2520 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2522 int i, num_arrays = 1;
2524 memset(q, 0, sizeof(*q));
2528 /* If the user passed an items pointer, he wants a copy of
2532 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2533 if (q->pool == NULL)
2536 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2538 for (i = 0; i < max; i++) {
2539 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2540 if (q->pool[i] == NULL) {
2544 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2548 *items = q->pool + max;
2549 memcpy(*items, q->pool, max * sizeof(void *));
2558 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2560 void iscsi_pool_free(struct iscsi_pool *q)
2564 for (i = 0; i < q->max; i++)
2568 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2571 * iscsi_host_add - add host to system
2573 * @pdev: parent device
2575 * This should be called by partial offload and software iscsi drivers
2576 * to add a host to the system.
2578 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2580 if (!shost->can_queue)
2581 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2583 if (!shost->cmd_per_lun)
2584 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2586 if (!shost->transportt->eh_timed_out)
2587 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2588 return scsi_add_host(shost, pdev);
2590 EXPORT_SYMBOL_GPL(iscsi_host_add);
2593 * iscsi_host_alloc - allocate a host and driver data
2594 * @sht: scsi host template
2595 * @dd_data_size: driver host data size
2596 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2598 * This should be called by partial offload and software iscsi drivers.
2599 * To access the driver specific memory use the iscsi_host_priv() macro.
2601 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2602 int dd_data_size, bool xmit_can_sleep)
2604 struct Scsi_Host *shost;
2605 struct iscsi_host *ihost;
2607 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2610 ihost = shost_priv(shost);
2612 if (xmit_can_sleep) {
2613 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2614 "iscsi_q_%d", shost->host_no);
2615 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2620 spin_lock_init(&ihost->lock);
2621 ihost->state = ISCSI_HOST_SETUP;
2622 ihost->num_sessions = 0;
2623 init_waitqueue_head(&ihost->session_removal_wq);
2627 scsi_host_put(shost);
2630 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2632 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2634 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2638 * iscsi_host_remove - remove host and sessions
2641 * If there are any sessions left, this will initiate the removal and wait
2642 * for the completion.
2644 void iscsi_host_remove(struct Scsi_Host *shost)
2646 struct iscsi_host *ihost = shost_priv(shost);
2647 unsigned long flags;
2649 spin_lock_irqsave(&ihost->lock, flags);
2650 ihost->state = ISCSI_HOST_REMOVED;
2651 spin_unlock_irqrestore(&ihost->lock, flags);
2653 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2654 wait_event_interruptible(ihost->session_removal_wq,
2655 ihost->num_sessions == 0);
2656 if (signal_pending(current))
2657 flush_signals(current);
2659 scsi_remove_host(shost);
2661 destroy_workqueue(ihost->workq);
2663 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2665 void iscsi_host_free(struct Scsi_Host *shost)
2667 struct iscsi_host *ihost = shost_priv(shost);
2669 kfree(ihost->netdev);
2670 kfree(ihost->hwaddress);
2671 kfree(ihost->initiatorname);
2672 scsi_host_put(shost);
2674 EXPORT_SYMBOL_GPL(iscsi_host_free);
2676 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2678 struct iscsi_host *ihost = shost_priv(shost);
2679 unsigned long flags;
2681 shost = scsi_host_get(shost);
2683 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2684 "of session teardown event because host already "
2689 spin_lock_irqsave(&ihost->lock, flags);
2690 ihost->num_sessions--;
2691 if (ihost->num_sessions == 0)
2692 wake_up(&ihost->session_removal_wq);
2693 spin_unlock_irqrestore(&ihost->lock, flags);
2694 scsi_host_put(shost);
2698 * iscsi_session_setup - create iscsi cls session and host and session
2699 * @iscsit: iscsi transport template
2701 * @cmds_max: session can queue
2702 * @cmd_task_size: LLD task private data size
2703 * @initial_cmdsn: initial CmdSN
2705 * This can be used by software iscsi_transports that allocate
2706 * a session per scsi host.
2708 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2709 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2710 * for nop handling and login/logout requests.
2712 struct iscsi_cls_session *
2713 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2714 uint16_t cmds_max, int dd_size, int cmd_task_size,
2715 uint32_t initial_cmdsn, unsigned int id)
2717 struct iscsi_host *ihost = shost_priv(shost);
2718 struct iscsi_session *session;
2719 struct iscsi_cls_session *cls_session;
2720 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2721 unsigned long flags;
2723 spin_lock_irqsave(&ihost->lock, flags);
2724 if (ihost->state == ISCSI_HOST_REMOVED) {
2725 spin_unlock_irqrestore(&ihost->lock, flags);
2728 ihost->num_sessions++;
2729 spin_unlock_irqrestore(&ihost->lock, flags);
2732 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2734 * The iscsi layer needs some tasks for nop handling and tmfs,
2735 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2736 * + 1 command for scsi IO.
2738 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2739 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2740 "must be a power of two that is at least %d.\n",
2741 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2742 goto dec_session_count;
2745 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2746 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2747 "must be a power of 2 less than or equal to %d.\n",
2748 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2749 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2752 if (!is_power_of_2(total_cmds)) {
2753 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2754 "must be a power of 2.\n", total_cmds);
2755 total_cmds = rounddown_pow_of_two(total_cmds);
2756 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2758 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2761 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2763 cls_session = iscsi_alloc_session(shost, iscsit,
2764 sizeof(struct iscsi_session) +
2767 goto dec_session_count;
2768 session = cls_session->dd_data;
2769 session->cls_session = cls_session;
2770 session->host = shost;
2771 session->state = ISCSI_STATE_FREE;
2772 session->fast_abort = 1;
2773 session->tgt_reset_timeout = 30;
2774 session->lu_reset_timeout = 15;
2775 session->abort_timeout = 10;
2776 session->scsi_cmds_max = scsi_cmds;
2777 session->cmds_max = total_cmds;
2778 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2779 session->exp_cmdsn = initial_cmdsn + 1;
2780 session->max_cmdsn = initial_cmdsn + 1;
2781 session->max_r2t = 1;
2782 session->tt = iscsit;
2783 session->dd_data = cls_session->dd_data + sizeof(*session);
2785 mutex_init(&session->eh_mutex);
2786 spin_lock_init(&session->frwd_lock);
2787 spin_lock_init(&session->back_lock);
2789 /* initialize SCSI PDU commands pool */
2790 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2791 (void***)&session->cmds,
2792 cmd_task_size + sizeof(struct iscsi_task)))
2793 goto cmdpool_alloc_fail;
2795 /* pre-format cmds pool with ITT */
2796 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2797 struct iscsi_task *task = session->cmds[cmd_i];
2800 task->dd_data = &task[1];
2802 task->state = ISCSI_TASK_FREE;
2803 INIT_LIST_HEAD(&task->running);
2806 if (!try_module_get(iscsit->owner))
2807 goto module_get_fail;
2809 if (iscsi_add_session(cls_session, id))
2810 goto cls_session_fail;
2815 module_put(iscsit->owner);
2817 iscsi_pool_free(&session->cmdpool);
2819 iscsi_free_session(cls_session);
2821 iscsi_host_dec_session_cnt(shost);
2824 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2827 * iscsi_session_teardown - destroy session, host, and cls_session
2828 * @cls_session: iscsi session
2830 * The driver must have called iscsi_remove_session before
2833 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2835 struct iscsi_session *session = cls_session->dd_data;
2836 struct module *owner = cls_session->transport->owner;
2837 struct Scsi_Host *shost = session->host;
2839 iscsi_pool_free(&session->cmdpool);
2841 kfree(session->password);
2842 kfree(session->password_in);
2843 kfree(session->username);
2844 kfree(session->username_in);
2845 kfree(session->targetname);
2846 kfree(session->targetalias);
2847 kfree(session->initiatorname);
2848 kfree(session->boot_root);
2849 kfree(session->boot_nic);
2850 kfree(session->boot_target);
2851 kfree(session->ifacename);
2852 kfree(session->portal_type);
2853 kfree(session->discovery_parent_type);
2855 iscsi_destroy_session(cls_session);
2856 iscsi_host_dec_session_cnt(shost);
2859 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2862 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2863 * @cls_session: iscsi_cls_session
2864 * @dd_size: private driver data size
2867 struct iscsi_cls_conn *
2868 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2871 struct iscsi_session *session = cls_session->dd_data;
2872 struct iscsi_conn *conn;
2873 struct iscsi_cls_conn *cls_conn;
2876 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2880 conn = cls_conn->dd_data;
2881 memset(conn, 0, sizeof(*conn) + dd_size);
2883 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2884 conn->session = session;
2885 conn->cls_conn = cls_conn;
2886 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2887 conn->id = conn_idx;
2888 conn->exp_statsn = 0;
2889 conn->tmf_state = TMF_INITIAL;
2891 init_timer(&conn->transport_timer);
2892 conn->transport_timer.data = (unsigned long)conn;
2893 conn->transport_timer.function = iscsi_check_transport_timeouts;
2895 INIT_LIST_HEAD(&conn->mgmtqueue);
2896 INIT_LIST_HEAD(&conn->cmdqueue);
2897 INIT_LIST_HEAD(&conn->requeue);
2898 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2900 /* allocate login_task used for the login/text sequences */
2901 spin_lock_bh(&session->frwd_lock);
2902 if (!kfifo_out(&session->cmdpool.queue,
2903 (void*)&conn->login_task,
2905 spin_unlock_bh(&session->frwd_lock);
2906 goto login_task_alloc_fail;
2908 spin_unlock_bh(&session->frwd_lock);
2910 data = (char *) __get_free_pages(GFP_KERNEL,
2911 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2913 goto login_task_data_alloc_fail;
2914 conn->login_task->data = conn->data = data;
2916 init_timer(&conn->tmf_timer);
2917 init_waitqueue_head(&conn->ehwait);
2921 login_task_data_alloc_fail:
2922 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2924 login_task_alloc_fail:
2925 iscsi_destroy_conn(cls_conn);
2928 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2931 * iscsi_conn_teardown - teardown iscsi connection
2932 * cls_conn: iscsi class connection
2934 * TODO: we may need to make this into a two step process
2935 * like scsi-mls remove + put host
2937 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2939 struct iscsi_conn *conn = cls_conn->dd_data;
2940 struct iscsi_session *session = conn->session;
2942 del_timer_sync(&conn->transport_timer);
2944 mutex_lock(&session->eh_mutex);
2945 spin_lock_bh(&session->frwd_lock);
2946 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2947 if (session->leadconn == conn) {
2949 * leading connection? then give up on recovery.
2951 session->state = ISCSI_STATE_TERMINATE;
2952 wake_up(&conn->ehwait);
2954 spin_unlock_bh(&session->frwd_lock);
2956 /* flush queued up work because we free the connection below */
2957 iscsi_suspend_tx(conn);
2959 spin_lock_bh(&session->frwd_lock);
2960 free_pages((unsigned long) conn->data,
2961 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2962 kfree(conn->persistent_address);
2963 kfree(conn->local_ipaddr);
2964 /* regular RX path uses back_lock */
2965 spin_lock_bh(&session->back_lock);
2966 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2968 spin_unlock_bh(&session->back_lock);
2969 if (session->leadconn == conn)
2970 session->leadconn = NULL;
2971 spin_unlock_bh(&session->frwd_lock);
2972 mutex_unlock(&session->eh_mutex);
2974 iscsi_destroy_conn(cls_conn);
2976 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2978 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2980 struct iscsi_conn *conn = cls_conn->dd_data;
2981 struct iscsi_session *session = conn->session;
2984 iscsi_conn_printk(KERN_ERR, conn,
2985 "can't start unbound connection\n");
2989 if ((session->imm_data_en || !session->initial_r2t_en) &&
2990 session->first_burst > session->max_burst) {
2991 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2992 "first_burst %d max_burst %d\n",
2993 session->first_burst, session->max_burst);
2997 if (conn->ping_timeout && !conn->recv_timeout) {
2998 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2999 "zero. Using 5 seconds\n.");
3000 conn->recv_timeout = 5;
3003 if (conn->recv_timeout && !conn->ping_timeout) {
3004 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3005 "zero. Using 5 seconds.\n");
3006 conn->ping_timeout = 5;
3009 spin_lock_bh(&session->frwd_lock);
3010 conn->c_stage = ISCSI_CONN_STARTED;
3011 session->state = ISCSI_STATE_LOGGED_IN;
3012 session->queued_cmdsn = session->cmdsn;
3014 conn->last_recv = jiffies;
3015 conn->last_ping = jiffies;
3016 if (conn->recv_timeout && conn->ping_timeout)
3017 mod_timer(&conn->transport_timer,
3018 jiffies + (conn->recv_timeout * HZ));
3020 switch(conn->stop_stage) {
3021 case STOP_CONN_RECOVER:
3023 * unblock eh_abort() if it is blocked. re-try all
3024 * commands after successful recovery
3026 conn->stop_stage = 0;
3027 conn->tmf_state = TMF_INITIAL;
3029 if (session->age == 16)
3032 case STOP_CONN_TERM:
3033 conn->stop_stage = 0;
3038 spin_unlock_bh(&session->frwd_lock);
3040 iscsi_unblock_session(session->cls_session);
3041 wake_up(&conn->ehwait);
3044 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3047 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3049 struct iscsi_task *task;
3052 for (i = 0; i < conn->session->cmds_max; i++) {
3053 task = conn->session->cmds[i];
3057 if (task->state == ISCSI_TASK_FREE)
3060 ISCSI_DBG_SESSION(conn->session,
3061 "failing mgmt itt 0x%x state %d\n",
3062 task->itt, task->state);
3063 state = ISCSI_TASK_ABRT_SESS_RECOV;
3064 if (task->state == ISCSI_TASK_PENDING)
3065 state = ISCSI_TASK_COMPLETED;
3066 iscsi_complete_task(task, state);
3071 static void iscsi_start_session_recovery(struct iscsi_session *session,
3072 struct iscsi_conn *conn, int flag)
3076 mutex_lock(&session->eh_mutex);
3077 spin_lock_bh(&session->frwd_lock);
3078 if (conn->stop_stage == STOP_CONN_TERM) {
3079 spin_unlock_bh(&session->frwd_lock);
3080 mutex_unlock(&session->eh_mutex);
3085 * When this is called for the in_login state, we only want to clean
3086 * up the login task and connection. We do not need to block and set
3087 * the recovery state again
3089 if (flag == STOP_CONN_TERM)
3090 session->state = ISCSI_STATE_TERMINATE;
3091 else if (conn->stop_stage != STOP_CONN_RECOVER)
3092 session->state = ISCSI_STATE_IN_RECOVERY;
3094 old_stop_stage = conn->stop_stage;
3095 conn->stop_stage = flag;
3096 spin_unlock_bh(&session->frwd_lock);
3098 del_timer_sync(&conn->transport_timer);
3099 iscsi_suspend_tx(conn);
3101 spin_lock_bh(&session->frwd_lock);
3102 conn->c_stage = ISCSI_CONN_STOPPED;
3103 spin_unlock_bh(&session->frwd_lock);
3106 * for connection level recovery we should not calculate
3107 * header digest. conn->hdr_size used for optimization
3108 * in hdr_extract() and will be re-negotiated at
3111 if (flag == STOP_CONN_RECOVER) {
3112 conn->hdrdgst_en = 0;
3113 conn->datadgst_en = 0;
3114 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3115 old_stop_stage != STOP_CONN_RECOVER) {
3116 ISCSI_DBG_SESSION(session, "blocking session\n");
3117 iscsi_block_session(session->cls_session);
3124 spin_lock_bh(&session->frwd_lock);
3125 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3126 fail_mgmt_tasks(session, conn);
3127 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3128 spin_unlock_bh(&session->frwd_lock);
3129 mutex_unlock(&session->eh_mutex);
3132 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3134 struct iscsi_conn *conn = cls_conn->dd_data;
3135 struct iscsi_session *session = conn->session;
3138 case STOP_CONN_RECOVER:
3139 case STOP_CONN_TERM:
3140 iscsi_start_session_recovery(session, conn, flag);
3143 iscsi_conn_printk(KERN_ERR, conn,
3144 "invalid stop flag %d\n", flag);
3147 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3149 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3150 struct iscsi_cls_conn *cls_conn, int is_leading)
3152 struct iscsi_session *session = cls_session->dd_data;
3153 struct iscsi_conn *conn = cls_conn->dd_data;
3155 spin_lock_bh(&session->frwd_lock);
3157 session->leadconn = conn;
3158 spin_unlock_bh(&session->frwd_lock);
3161 * Unblock xmitworker(), Login Phase will pass through.
3163 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3164 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3167 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3169 int iscsi_switch_str_param(char **param, char *new_val_buf)
3174 if (!strcmp(*param, new_val_buf))
3178 new_val = kstrdup(new_val_buf, GFP_NOIO);
3186 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3188 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3189 enum iscsi_param param, char *buf, int buflen)
3191 struct iscsi_conn *conn = cls_conn->dd_data;
3192 struct iscsi_session *session = conn->session;
3196 case ISCSI_PARAM_FAST_ABORT:
3197 sscanf(buf, "%d", &session->fast_abort);
3199 case ISCSI_PARAM_ABORT_TMO:
3200 sscanf(buf, "%d", &session->abort_timeout);
3202 case ISCSI_PARAM_LU_RESET_TMO:
3203 sscanf(buf, "%d", &session->lu_reset_timeout);
3205 case ISCSI_PARAM_TGT_RESET_TMO:
3206 sscanf(buf, "%d", &session->tgt_reset_timeout);
3208 case ISCSI_PARAM_PING_TMO:
3209 sscanf(buf, "%d", &conn->ping_timeout);
3211 case ISCSI_PARAM_RECV_TMO:
3212 sscanf(buf, "%d", &conn->recv_timeout);
3214 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3215 sscanf(buf, "%d", &conn->max_recv_dlength);
3217 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3218 sscanf(buf, "%d", &conn->max_xmit_dlength);
3220 case ISCSI_PARAM_HDRDGST_EN:
3221 sscanf(buf, "%d", &conn->hdrdgst_en);
3223 case ISCSI_PARAM_DATADGST_EN:
3224 sscanf(buf, "%d", &conn->datadgst_en);
3226 case ISCSI_PARAM_INITIAL_R2T_EN:
3227 sscanf(buf, "%d", &session->initial_r2t_en);
3229 case ISCSI_PARAM_MAX_R2T:
3230 sscanf(buf, "%hu", &session->max_r2t);
3232 case ISCSI_PARAM_IMM_DATA_EN:
3233 sscanf(buf, "%d", &session->imm_data_en);
3235 case ISCSI_PARAM_FIRST_BURST:
3236 sscanf(buf, "%d", &session->first_burst);
3238 case ISCSI_PARAM_MAX_BURST:
3239 sscanf(buf, "%d", &session->max_burst);
3241 case ISCSI_PARAM_PDU_INORDER_EN:
3242 sscanf(buf, "%d", &session->pdu_inorder_en);
3244 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3245 sscanf(buf, "%d", &session->dataseq_inorder_en);
3247 case ISCSI_PARAM_ERL:
3248 sscanf(buf, "%d", &session->erl);
3250 case ISCSI_PARAM_EXP_STATSN:
3251 sscanf(buf, "%u", &conn->exp_statsn);
3253 case ISCSI_PARAM_USERNAME:
3254 return iscsi_switch_str_param(&session->username, buf);
3255 case ISCSI_PARAM_USERNAME_IN:
3256 return iscsi_switch_str_param(&session->username_in, buf);
3257 case ISCSI_PARAM_PASSWORD:
3258 return iscsi_switch_str_param(&session->password, buf);
3259 case ISCSI_PARAM_PASSWORD_IN:
3260 return iscsi_switch_str_param(&session->password_in, buf);
3261 case ISCSI_PARAM_TARGET_NAME:
3262 return iscsi_switch_str_param(&session->targetname, buf);
3263 case ISCSI_PARAM_TARGET_ALIAS:
3264 return iscsi_switch_str_param(&session->targetalias, buf);
3265 case ISCSI_PARAM_TPGT:
3266 sscanf(buf, "%d", &session->tpgt);
3268 case ISCSI_PARAM_PERSISTENT_PORT:
3269 sscanf(buf, "%d", &conn->persistent_port);
3271 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3272 return iscsi_switch_str_param(&conn->persistent_address, buf);
3273 case ISCSI_PARAM_IFACE_NAME:
3274 return iscsi_switch_str_param(&session->ifacename, buf);
3275 case ISCSI_PARAM_INITIATOR_NAME:
3276 return iscsi_switch_str_param(&session->initiatorname, buf);
3277 case ISCSI_PARAM_BOOT_ROOT:
3278 return iscsi_switch_str_param(&session->boot_root, buf);
3279 case ISCSI_PARAM_BOOT_NIC:
3280 return iscsi_switch_str_param(&session->boot_nic, buf);
3281 case ISCSI_PARAM_BOOT_TARGET:
3282 return iscsi_switch_str_param(&session->boot_target, buf);
3283 case ISCSI_PARAM_PORTAL_TYPE:
3284 return iscsi_switch_str_param(&session->portal_type, buf);
3285 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3286 return iscsi_switch_str_param(&session->discovery_parent_type,
3288 case ISCSI_PARAM_DISCOVERY_SESS:
3289 sscanf(buf, "%d", &val);
3290 session->discovery_sess = !!val;
3292 case ISCSI_PARAM_LOCAL_IPADDR:
3293 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3300 EXPORT_SYMBOL_GPL(iscsi_set_param);
3302 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3303 enum iscsi_param param, char *buf)
3305 struct iscsi_session *session = cls_session->dd_data;
3309 case ISCSI_PARAM_FAST_ABORT:
3310 len = sprintf(buf, "%d\n", session->fast_abort);
3312 case ISCSI_PARAM_ABORT_TMO:
3313 len = sprintf(buf, "%d\n", session->abort_timeout);
3315 case ISCSI_PARAM_LU_RESET_TMO:
3316 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3318 case ISCSI_PARAM_TGT_RESET_TMO:
3319 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3321 case ISCSI_PARAM_INITIAL_R2T_EN:
3322 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3324 case ISCSI_PARAM_MAX_R2T:
3325 len = sprintf(buf, "%hu\n", session->max_r2t);
3327 case ISCSI_PARAM_IMM_DATA_EN:
3328 len = sprintf(buf, "%d\n", session->imm_data_en);
3330 case ISCSI_PARAM_FIRST_BURST:
3331 len = sprintf(buf, "%u\n", session->first_burst);
3333 case ISCSI_PARAM_MAX_BURST:
3334 len = sprintf(buf, "%u\n", session->max_burst);
3336 case ISCSI_PARAM_PDU_INORDER_EN:
3337 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3339 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3340 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3342 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3343 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3345 case ISCSI_PARAM_ERL:
3346 len = sprintf(buf, "%d\n", session->erl);
3348 case ISCSI_PARAM_TARGET_NAME:
3349 len = sprintf(buf, "%s\n", session->targetname);
3351 case ISCSI_PARAM_TARGET_ALIAS:
3352 len = sprintf(buf, "%s\n", session->targetalias);
3354 case ISCSI_PARAM_TPGT:
3355 len = sprintf(buf, "%d\n", session->tpgt);
3357 case ISCSI_PARAM_USERNAME:
3358 len = sprintf(buf, "%s\n", session->username);
3360 case ISCSI_PARAM_USERNAME_IN:
3361 len = sprintf(buf, "%s\n", session->username_in);
3363 case ISCSI_PARAM_PASSWORD:
3364 len = sprintf(buf, "%s\n", session->password);
3366 case ISCSI_PARAM_PASSWORD_IN:
3367 len = sprintf(buf, "%s\n", session->password_in);
3369 case ISCSI_PARAM_IFACE_NAME:
3370 len = sprintf(buf, "%s\n", session->ifacename);
3372 case ISCSI_PARAM_INITIATOR_NAME:
3373 len = sprintf(buf, "%s\n", session->initiatorname);
3375 case ISCSI_PARAM_BOOT_ROOT:
3376 len = sprintf(buf, "%s\n", session->boot_root);
3378 case ISCSI_PARAM_BOOT_NIC:
3379 len = sprintf(buf, "%s\n", session->boot_nic);
3381 case ISCSI_PARAM_BOOT_TARGET:
3382 len = sprintf(buf, "%s\n", session->boot_target);
3384 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3385 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3387 case ISCSI_PARAM_DISCOVERY_SESS:
3388 len = sprintf(buf, "%u\n", session->discovery_sess);
3390 case ISCSI_PARAM_PORTAL_TYPE:
3391 len = sprintf(buf, "%s\n", session->portal_type);
3393 case ISCSI_PARAM_CHAP_AUTH_EN:
3394 len = sprintf(buf, "%u\n", session->chap_auth_en);
3396 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3397 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3399 case ISCSI_PARAM_BIDI_CHAP_EN:
3400 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3402 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3403 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3405 case ISCSI_PARAM_DEF_TIME2WAIT:
3406 len = sprintf(buf, "%d\n", session->time2wait);
3408 case ISCSI_PARAM_DEF_TIME2RETAIN:
3409 len = sprintf(buf, "%d\n", session->time2retain);
3411 case ISCSI_PARAM_TSID:
3412 len = sprintf(buf, "%u\n", session->tsid);
3414 case ISCSI_PARAM_ISID:
3415 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3416 session->isid[0], session->isid[1],
3417 session->isid[2], session->isid[3],
3418 session->isid[4], session->isid[5]);
3420 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3421 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3423 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3424 if (session->discovery_parent_type)
3425 len = sprintf(buf, "%s\n",
3426 session->discovery_parent_type);
3428 len = sprintf(buf, "\n");
3436 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3438 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3439 enum iscsi_param param, char *buf)
3441 struct sockaddr_in6 *sin6 = NULL;
3442 struct sockaddr_in *sin = NULL;
3445 switch (addr->ss_family) {
3447 sin = (struct sockaddr_in *)addr;
3450 sin6 = (struct sockaddr_in6 *)addr;
3457 case ISCSI_PARAM_CONN_ADDRESS:
3458 case ISCSI_HOST_PARAM_IPADDRESS:
3460 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3462 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3464 case ISCSI_PARAM_CONN_PORT:
3465 case ISCSI_PARAM_LOCAL_PORT:
3467 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3469 len = sprintf(buf, "%hu\n",
3470 be16_to_cpu(sin6->sin6_port));
3478 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3480 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3481 enum iscsi_param param, char *buf)
3483 struct iscsi_conn *conn = cls_conn->dd_data;
3487 case ISCSI_PARAM_PING_TMO:
3488 len = sprintf(buf, "%u\n", conn->ping_timeout);
3490 case ISCSI_PARAM_RECV_TMO:
3491 len = sprintf(buf, "%u\n", conn->recv_timeout);
3493 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3494 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3496 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3497 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3499 case ISCSI_PARAM_HDRDGST_EN:
3500 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3502 case ISCSI_PARAM_DATADGST_EN:
3503 len = sprintf(buf, "%d\n", conn->datadgst_en);
3505 case ISCSI_PARAM_IFMARKER_EN:
3506 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3508 case ISCSI_PARAM_OFMARKER_EN:
3509 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3511 case ISCSI_PARAM_EXP_STATSN:
3512 len = sprintf(buf, "%u\n", conn->exp_statsn);
3514 case ISCSI_PARAM_PERSISTENT_PORT:
3515 len = sprintf(buf, "%d\n", conn->persistent_port);
3517 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3518 len = sprintf(buf, "%s\n", conn->persistent_address);
3520 case ISCSI_PARAM_STATSN:
3521 len = sprintf(buf, "%u\n", conn->statsn);
3523 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3524 len = sprintf(buf, "%u\n", conn->max_segment_size);
3526 case ISCSI_PARAM_KEEPALIVE_TMO:
3527 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3529 case ISCSI_PARAM_LOCAL_PORT:
3530 len = sprintf(buf, "%u\n", conn->local_port);
3532 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3533 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3535 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3536 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3538 case ISCSI_PARAM_TCP_WSF_DISABLE:
3539 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3541 case ISCSI_PARAM_TCP_TIMER_SCALE:
3542 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3544 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3545 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3547 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3548 len = sprintf(buf, "%u\n", conn->fragment_disable);
3550 case ISCSI_PARAM_IPV4_TOS:
3551 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3553 case ISCSI_PARAM_IPV6_TC:
3554 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3556 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3557 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3559 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3560 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3562 case ISCSI_PARAM_TCP_XMIT_WSF:
3563 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3565 case ISCSI_PARAM_TCP_RECV_WSF:
3566 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3568 case ISCSI_PARAM_LOCAL_IPADDR:
3569 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3577 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3579 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3582 struct iscsi_host *ihost = shost_priv(shost);
3586 case ISCSI_HOST_PARAM_NETDEV_NAME:
3587 len = sprintf(buf, "%s\n", ihost->netdev);
3589 case ISCSI_HOST_PARAM_HWADDRESS:
3590 len = sprintf(buf, "%s\n", ihost->hwaddress);
3592 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3593 len = sprintf(buf, "%s\n", ihost->initiatorname);
3601 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3603 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3604 char *buf, int buflen)
3606 struct iscsi_host *ihost = shost_priv(shost);
3609 case ISCSI_HOST_PARAM_NETDEV_NAME:
3610 return iscsi_switch_str_param(&ihost->netdev, buf);
3611 case ISCSI_HOST_PARAM_HWADDRESS:
3612 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3613 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3614 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3621 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3623 MODULE_AUTHOR("Mike Christie");
3624 MODULE_DESCRIPTION("iSCSI library functions");
3625 MODULE_LICENSE("GPL");