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/sched/signal.h>
30 #include <linux/module.h>
31 #include <asm/unaligned.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_eh.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi.h>
39 #include <scsi/iscsi_proto.h>
40 #include <scsi/scsi_transport.h>
41 #include <scsi/scsi_transport_iscsi.h>
42 #include <scsi/libiscsi.h>
43 #include <trace/events/iscsi.h>
45 static int iscsi_dbg_lib_conn;
46 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
48 MODULE_PARM_DESC(debug_libiscsi_conn,
49 "Turn on debugging for connections in libiscsi module. "
50 "Set to 1 to turn on, and zero to turn off. Default is off.");
52 static int iscsi_dbg_lib_session;
53 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
55 MODULE_PARM_DESC(debug_libiscsi_session,
56 "Turn on debugging for sessions in libiscsi module. "
57 "Set to 1 to turn on, and zero to turn off. Default is off.");
59 static int iscsi_dbg_lib_eh;
60 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
62 MODULE_PARM_DESC(debug_libiscsi_eh,
63 "Turn on debugging for error handling in libiscsi module. "
64 "Set to 1 to turn on, and zero to turn off. Default is off.");
66 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
68 if (iscsi_dbg_lib_conn) \
69 iscsi_conn_printk(KERN_INFO, _conn, \
72 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
73 &(_conn)->cls_conn->dev, \
74 "%s " dbg_fmt, __func__, ##arg);\
77 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
79 if (iscsi_dbg_lib_session) \
80 iscsi_session_printk(KERN_INFO, _session, \
83 iscsi_dbg_trace(trace_iscsi_dbg_session, \
84 &(_session)->cls_session->dev, \
85 "%s " dbg_fmt, __func__, ##arg); \
88 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
90 if (iscsi_dbg_lib_eh) \
91 iscsi_session_printk(KERN_INFO, _session, \
94 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
95 &(_session)->cls_session->dev, \
96 "%s " dbg_fmt, __func__, ##arg); \
99 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
101 struct Scsi_Host *shost = conn->session->host;
102 struct iscsi_host *ihost = shost_priv(shost);
105 queue_work(ihost->workq, &conn->xmitwork);
107 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
109 static void __iscsi_update_cmdsn(struct iscsi_session *session,
110 uint32_t exp_cmdsn, uint32_t max_cmdsn)
113 * standard specifies this check for when to update expected and
114 * max sequence numbers
116 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
119 if (exp_cmdsn != session->exp_cmdsn &&
120 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
121 session->exp_cmdsn = exp_cmdsn;
123 if (max_cmdsn != session->max_cmdsn &&
124 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
125 session->max_cmdsn = max_cmdsn;
128 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
130 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
131 be32_to_cpu(hdr->max_cmdsn));
133 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
136 * iscsi_prep_data_out_pdu - initialize Data-Out
137 * @task: scsi command task
139 * @hdr: iscsi data in pdu
142 * Initialize Data-Out within this R2T sequence and finds
143 * proper data_offset within this SCSI command.
145 * This function is called with connection lock taken.
147 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
148 struct iscsi_data *hdr)
150 struct iscsi_conn *conn = task->conn;
151 unsigned int left = r2t->data_length - r2t->sent;
153 task->hdr_len = sizeof(struct iscsi_data);
155 memset(hdr, 0, sizeof(struct iscsi_data));
157 hdr->datasn = cpu_to_be32(r2t->datasn);
159 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
160 hdr->lun = task->lun;
161 hdr->itt = task->hdr_itt;
162 hdr->exp_statsn = r2t->exp_statsn;
163 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
164 if (left > conn->max_xmit_dlength) {
165 hton24(hdr->dlength, conn->max_xmit_dlength);
166 r2t->data_count = conn->max_xmit_dlength;
169 hton24(hdr->dlength, left);
170 r2t->data_count = left;
171 hdr->flags = ISCSI_FLAG_CMD_FINAL;
173 conn->dataout_pdus_cnt++;
175 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
177 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
179 unsigned exp_len = task->hdr_len + len;
181 if (exp_len > task->hdr_max) {
186 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
187 task->hdr_len = exp_len;
192 * make an extended cdb AHS
194 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
196 struct scsi_cmnd *cmd = task->sc;
197 unsigned rlen, pad_len;
198 unsigned short ahslength;
199 struct iscsi_ecdb_ahdr *ecdb_ahdr;
202 ecdb_ahdr = iscsi_next_hdr(task);
203 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
205 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
206 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
208 pad_len = iscsi_padding(rlen);
210 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
211 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
216 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
218 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
219 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
220 ecdb_ahdr->reserved = 0;
221 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
223 ISCSI_DBG_SESSION(task->conn->session,
224 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
225 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
226 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
232 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
234 * @opcode: opcode to check for
236 * During TMF a task has to be checked if it's affected.
237 * All unrelated I/O can be passed through, but I/O to the
238 * affected LUN should be restricted.
239 * If 'fast_abort' is set we won't be sending any I/O to the
241 * Otherwise the target is waiting for all TTTs to be completed,
242 * so we have to send all outstanding Data-Out PDUs to the target.
244 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
246 struct iscsi_conn *conn = task->conn;
247 struct iscsi_tm *tmf = &conn->tmhdr;
250 if (conn->tmf_state == TMF_INITIAL)
253 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
256 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
257 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
259 * Allow PDUs for unrelated LUNs
261 hdr_lun = scsilun_to_int(&tmf->lun);
262 if (hdr_lun != task->sc->device->lun)
265 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
267 * Fail all SCSI cmd PDUs
269 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
270 iscsi_conn_printk(KERN_INFO, conn,
279 * And also all data-out PDUs in response to R2T
280 * if fast_abort is set.
282 if (conn->session->fast_abort) {
283 iscsi_conn_printk(KERN_INFO, conn,
285 "0x%x/0x%x] fast abort.\n",
291 case ISCSI_TM_FUNC_ABORT_TASK:
293 * the caller has already checked if the task
294 * they want to abort was in the pending queue so if
295 * we are here the cmd pdu has gone out already, and
296 * we will only hit this for data-outs
298 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
299 task->hdr_itt == tmf->rtt) {
300 ISCSI_DBG_SESSION(conn->session,
301 "Preventing task %x/%x from sending "
302 "data-out due to abort task in "
303 "progress\n", task->itt,
314 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
317 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
318 * fields like dlength or final based on how much data it sends
320 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
322 struct iscsi_conn *conn = task->conn;
323 struct iscsi_session *session = conn->session;
324 struct scsi_cmnd *sc = task->sc;
325 struct iscsi_scsi_req *hdr;
326 unsigned hdrlength, cmd_len, transfer_length;
330 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
334 if (conn->session->tt->alloc_pdu) {
335 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
339 hdr = (struct iscsi_scsi_req *)task->hdr;
341 memset(hdr, 0, sizeof(*hdr));
343 if (session->tt->parse_pdu_itt)
344 hdr->itt = task->hdr_itt = itt;
346 hdr->itt = task->hdr_itt = build_itt(task->itt,
347 task->conn->session->age);
349 rc = iscsi_add_hdr(task, sizeof(*hdr));
352 hdr->opcode = ISCSI_OP_SCSI_CMD;
353 hdr->flags = ISCSI_ATTR_SIMPLE;
354 int_to_scsilun(sc->device->lun, &hdr->lun);
355 task->lun = hdr->lun;
356 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
357 cmd_len = sc->cmd_len;
358 if (cmd_len < ISCSI_CDB_SIZE)
359 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
360 else if (cmd_len > ISCSI_CDB_SIZE) {
361 rc = iscsi_prep_ecdb_ahs(task);
364 cmd_len = ISCSI_CDB_SIZE;
366 memcpy(hdr->cdb, sc->cmnd, cmd_len);
369 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
370 task->protected = true;
372 transfer_length = scsi_transfer_length(sc);
373 hdr->data_length = cpu_to_be32(transfer_length);
374 if (sc->sc_data_direction == DMA_TO_DEVICE) {
375 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
377 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
381 * imm_count bytes to be sent right after
384 * unsol_count bytes(as Data-Out) to be sent
385 * without R2T ack right after
388 * r2t data_length bytes to be sent via R2T ack's
390 * pad_count bytes to be sent as zero-padding
392 memset(r2t, 0, sizeof(*r2t));
394 if (session->imm_data_en) {
395 if (transfer_length >= session->first_burst)
396 task->imm_count = min(session->first_burst,
397 conn->max_xmit_dlength);
399 task->imm_count = min(transfer_length,
400 conn->max_xmit_dlength);
401 hton24(hdr->dlength, task->imm_count);
403 zero_data(hdr->dlength);
405 if (!session->initial_r2t_en) {
406 r2t->data_length = min(session->first_burst,
409 r2t->data_offset = task->imm_count;
410 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
411 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
414 if (!task->unsol_r2t.data_length)
415 /* No unsolicit Data-Out's */
416 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
418 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
419 zero_data(hdr->dlength);
421 if (sc->sc_data_direction == DMA_FROM_DEVICE)
422 hdr->flags |= ISCSI_FLAG_CMD_READ;
425 /* calculate size of additional header segments (AHSs) */
426 hdrlength = task->hdr_len - sizeof(*hdr);
428 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
429 hdrlength /= ISCSI_PAD_LEN;
431 WARN_ON(hdrlength >= 256);
432 hdr->hlength = hdrlength & 0xFF;
433 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
435 if (session->tt->init_task && session->tt->init_task(task))
438 task->state = ISCSI_TASK_RUNNING;
441 conn->scsicmd_pdus_cnt++;
442 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
443 "itt 0x%x len %d cmdsn %d win %d]\n",
444 sc->sc_data_direction == DMA_TO_DEVICE ?
445 "write" : "read", conn->id, sc, sc->cmnd[0],
446 task->itt, transfer_length,
448 session->max_cmdsn - session->exp_cmdsn + 1);
453 * iscsi_free_task - free a task
454 * @task: iscsi cmd task
456 * Must be called with session back_lock.
457 * This function returns the scsi command to scsi-ml or cleans
458 * up mgmt tasks then returns the task to the pool.
460 static void iscsi_free_task(struct iscsi_task *task)
462 struct iscsi_conn *conn = task->conn;
463 struct iscsi_session *session = conn->session;
464 struct scsi_cmnd *sc = task->sc;
465 int oldstate = task->state;
467 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
468 task->itt, task->state, task->sc);
470 session->tt->cleanup_task(task);
471 task->state = ISCSI_TASK_FREE;
474 * login task is preallocated so do not free
476 if (conn->login_task == task)
479 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
482 /* SCSI eh reuses commands to verify us */
485 * queue command may call this to free the task, so
486 * it will decide how to return sc to scsi-ml.
488 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
493 void __iscsi_get_task(struct iscsi_task *task)
495 refcount_inc(&task->refcount);
497 EXPORT_SYMBOL_GPL(__iscsi_get_task);
499 void __iscsi_put_task(struct iscsi_task *task)
501 if (refcount_dec_and_test(&task->refcount))
502 iscsi_free_task(task);
504 EXPORT_SYMBOL_GPL(__iscsi_put_task);
506 void iscsi_put_task(struct iscsi_task *task)
508 struct iscsi_session *session = task->conn->session;
510 /* regular RX path uses back_lock */
511 spin_lock_bh(&session->back_lock);
512 __iscsi_put_task(task);
513 spin_unlock_bh(&session->back_lock);
515 EXPORT_SYMBOL_GPL(iscsi_put_task);
518 * iscsi_complete_task - finish a task
519 * @task: iscsi cmd task
520 * @state: state to complete task with
522 * Must be called with session back_lock.
524 static void iscsi_complete_task(struct iscsi_task *task, int state)
526 struct iscsi_conn *conn = task->conn;
528 ISCSI_DBG_SESSION(conn->session,
529 "complete task itt 0x%x state %d sc %p\n",
530 task->itt, task->state, task->sc);
531 if (task->state == ISCSI_TASK_COMPLETED ||
532 task->state == ISCSI_TASK_ABRT_TMF ||
533 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
534 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
536 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
539 spin_lock_bh(&conn->taskqueuelock);
540 if (!list_empty(&task->running)) {
541 pr_debug_once("%s while task on list", __func__);
542 list_del_init(&task->running);
544 spin_unlock_bh(&conn->taskqueuelock);
546 if (conn->task == task)
549 if (conn->ping_task == task)
550 conn->ping_task = NULL;
552 /* release get from queueing */
553 __iscsi_put_task(task);
557 * iscsi_complete_scsi_task - finish scsi task normally
558 * @task: iscsi task for scsi cmd
559 * @exp_cmdsn: expected cmd sn in cpu format
560 * @max_cmdsn: max cmd sn in cpu format
562 * This is used when drivers do not need or cannot perform
563 * lower level pdu processing.
565 * Called with session back_lock
567 void iscsi_complete_scsi_task(struct iscsi_task *task,
568 uint32_t exp_cmdsn, uint32_t max_cmdsn)
570 struct iscsi_conn *conn = task->conn;
572 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
574 conn->last_recv = jiffies;
575 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
576 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
578 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
582 * session back_lock must be held and if not called for a task that is
583 * still pending or from the xmit thread, then xmit thread must
586 static void fail_scsi_task(struct iscsi_task *task, int err)
588 struct iscsi_conn *conn = task->conn;
589 struct scsi_cmnd *sc;
593 * if a command completes and we get a successful tmf response
594 * we will hit this because the scsi eh abort code does not take
601 if (task->state == ISCSI_TASK_PENDING) {
603 * cmd never made it to the xmit thread, so we should not count
604 * the cmd in the sequencing
606 conn->session->queued_cmdsn--;
607 /* it was never sent so just complete like normal */
608 state = ISCSI_TASK_COMPLETED;
609 } else if (err == DID_TRANSPORT_DISRUPTED)
610 state = ISCSI_TASK_ABRT_SESS_RECOV;
612 state = ISCSI_TASK_ABRT_TMF;
614 sc->result = err << 16;
615 scsi_set_resid(sc, scsi_bufflen(sc));
617 /* regular RX path uses back_lock */
618 spin_lock_bh(&conn->session->back_lock);
619 iscsi_complete_task(task, state);
620 spin_unlock_bh(&conn->session->back_lock);
623 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
624 struct iscsi_task *task)
626 struct iscsi_session *session = conn->session;
627 struct iscsi_hdr *hdr = task->hdr;
628 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
629 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
631 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
634 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
635 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
637 * pre-format CmdSN for outgoing PDU.
639 nop->cmdsn = cpu_to_be32(session->cmdsn);
640 if (hdr->itt != RESERVED_ITT) {
642 * TODO: We always use immediate for normal session pdus.
643 * If we start to send tmfs or nops as non-immediate then
644 * we should start checking the cmdsn numbers for mgmt tasks.
646 * During discovery sessions iscsid sends TEXT as non immediate,
647 * but we always only send one PDU at a time.
649 if (conn->c_stage == ISCSI_CONN_STARTED &&
650 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
651 session->queued_cmdsn++;
656 if (session->tt->init_task && session->tt->init_task(task))
659 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
660 session->state = ISCSI_STATE_LOGGING_OUT;
662 task->state = ISCSI_TASK_RUNNING;
663 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
664 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
665 hdr->itt, task->data_count);
669 static struct iscsi_task *
670 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
671 char *data, uint32_t data_size)
673 struct iscsi_session *session = conn->session;
674 struct iscsi_host *ihost = shost_priv(session->host);
675 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
676 struct iscsi_task *task;
679 if (session->state == ISCSI_STATE_TERMINATE)
682 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
684 * Login and Text are sent serially, in
685 * request-followed-by-response sequence.
686 * Same task can be used. Same ITT must be used.
687 * Note that login_task is preallocated at conn_create().
689 if (conn->login_task->state != ISCSI_TASK_FREE) {
690 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
691 "progress. Cannot start new task.\n");
695 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
696 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);
700 task = conn->login_task;
702 if (session->state != ISCSI_STATE_LOGGED_IN)
705 if (data_size != 0) {
706 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
710 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
711 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
713 if (!kfifo_out(&session->cmdpool.queue,
714 (void*)&task, sizeof(void*)))
718 * released in complete pdu for task we expect a response for, and
719 * released by the lld when it has transmitted the task for
720 * pdus we do not expect a response for.
722 refcount_set(&task->refcount, 1);
725 INIT_LIST_HEAD(&task->running);
726 task->state = ISCSI_TASK_PENDING;
729 memcpy(task->data, data, data_size);
730 task->data_count = data_size;
732 task->data_count = 0;
734 if (conn->session->tt->alloc_pdu) {
735 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
736 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
737 "pdu for mgmt task.\n");
742 itt = task->hdr->itt;
743 task->hdr_len = sizeof(struct iscsi_hdr);
744 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
746 if (hdr->itt != RESERVED_ITT) {
747 if (session->tt->parse_pdu_itt)
748 task->hdr->itt = itt;
750 task->hdr->itt = build_itt(task->itt,
751 task->conn->session->age);
755 if (iscsi_prep_mgmt_task(conn, task))
758 if (session->tt->xmit_task(task))
761 spin_lock_bh(&conn->taskqueuelock);
762 list_add_tail(&task->running, &conn->mgmtqueue);
763 spin_unlock_bh(&conn->taskqueuelock);
764 iscsi_conn_queue_work(conn);
770 /* regular RX path uses back_lock */
771 spin_lock(&session->back_lock);
772 __iscsi_put_task(task);
773 spin_unlock(&session->back_lock);
777 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
778 char *data, uint32_t data_size)
780 struct iscsi_conn *conn = cls_conn->dd_data;
781 struct iscsi_session *session = conn->session;
784 spin_lock_bh(&session->frwd_lock);
785 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
787 spin_unlock_bh(&session->frwd_lock);
790 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
793 * iscsi_cmd_rsp - SCSI Command Response processing
794 * @conn: iscsi connection
796 * @task: scsi command task
797 * @data: cmd data buffer
798 * @datalen: len of buffer
800 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
801 * then completes the command and task.
803 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
804 struct iscsi_task *task, char *data,
807 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
808 struct iscsi_session *session = conn->session;
809 struct scsi_cmnd *sc = task->sc;
811 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
812 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
814 sc->result = (DID_OK << 16) | rhdr->cmd_status;
816 if (task->protected) {
821 * Transports that didn't implement check_protection
822 * callback but still published T10-PI support to scsi-mid
823 * deserve this BUG_ON.
825 BUG_ON(!session->tt->check_protection);
827 ascq = session->tt->check_protection(task, §or);
829 sc->result = DRIVER_SENSE << 24 |
830 SAM_STAT_CHECK_CONDITION;
831 scsi_build_sense_buffer(1, sc->sense_buffer,
832 ILLEGAL_REQUEST, 0x10, ascq);
833 scsi_set_sense_information(sc->sense_buffer,
834 SCSI_SENSE_BUFFERSIZE,
840 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
841 sc->result = DID_ERROR << 16;
845 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
850 iscsi_conn_printk(KERN_ERR, conn,
851 "Got CHECK_CONDITION but invalid data "
852 "buffer size of %d\n", datalen);
853 sc->result = DID_BAD_TARGET << 16;
857 senselen = get_unaligned_be16(data);
858 if (datalen < senselen)
859 goto invalid_datalen;
861 memcpy(sc->sense_buffer, data + 2,
862 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
863 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
864 min_t(uint16_t, senselen,
865 SCSI_SENSE_BUFFERSIZE));
868 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
869 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
870 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
873 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
874 ISCSI_FLAG_CMD_OVERFLOW)) {
875 int res_count = be32_to_cpu(rhdr->residual_count);
878 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
879 res_count <= scsi_bufflen(sc)))
880 /* write side for bidi or uni-io set_resid */
881 scsi_set_resid(sc, res_count);
883 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
886 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
887 sc, sc->result, task->itt);
888 conn->scsirsp_pdus_cnt++;
889 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
893 * iscsi_data_in_rsp - SCSI Data-In Response processing
894 * @conn: iscsi connection
896 * @task: scsi command task
899 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
900 struct iscsi_task *task)
902 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
903 struct scsi_cmnd *sc = task->sc;
905 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
908 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
909 sc->result = (DID_OK << 16) | rhdr->cmd_status;
910 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
911 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
912 ISCSI_FLAG_DATA_OVERFLOW)) {
913 int res_count = be32_to_cpu(rhdr->residual_count);
916 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
917 res_count <= sc->sdb.length))
918 scsi_set_resid(sc, res_count);
920 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
923 ISCSI_DBG_SESSION(conn->session, "data in with status done "
924 "[sc %p res %d itt 0x%x]\n",
925 sc, sc->result, task->itt);
926 conn->scsirsp_pdus_cnt++;
927 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
930 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
932 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
934 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
935 conn->tmfrsp_pdus_cnt++;
937 if (conn->tmf_state != TMF_QUEUED)
940 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
941 conn->tmf_state = TMF_SUCCESS;
942 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
943 conn->tmf_state = TMF_NOT_FOUND;
945 conn->tmf_state = TMF_FAILED;
946 wake_up(&conn->ehwait);
949 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
951 struct iscsi_nopout hdr;
952 struct iscsi_task *task;
954 if (!rhdr && conn->ping_task)
957 memset(&hdr, 0, sizeof(struct iscsi_nopout));
958 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
959 hdr.flags = ISCSI_FLAG_CMD_FINAL;
964 hdr.itt = RESERVED_ITT;
966 hdr.ttt = RESERVED_ITT;
968 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
970 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
973 /* only track our nops */
974 conn->ping_task = task;
975 conn->last_ping = jiffies;
981 static int iscsi_nop_out_rsp(struct iscsi_task *task,
982 struct iscsi_nopin *nop, char *data, int datalen)
984 struct iscsi_conn *conn = task->conn;
987 if (conn->ping_task != task) {
989 * If this is not in response to one of our
990 * nops then it must be from userspace.
992 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
994 rc = ISCSI_ERR_CONN_FAILED;
996 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
997 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1001 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1002 char *data, int datalen)
1004 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1005 struct iscsi_hdr rejected_pdu;
1008 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1010 if (ntoh24(reject->dlength) > datalen ||
1011 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1012 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1013 "pdu. Invalid data length (pdu dlength "
1014 "%u, datalen %d\n", ntoh24(reject->dlength),
1016 return ISCSI_ERR_PROTO;
1018 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1019 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1021 switch (reject->reason) {
1022 case ISCSI_REASON_DATA_DIGEST_ERROR:
1023 iscsi_conn_printk(KERN_ERR, conn,
1024 "pdu (op 0x%x itt 0x%x) rejected "
1025 "due to DataDigest error.\n",
1026 opcode, rejected_pdu.itt);
1028 case ISCSI_REASON_IMM_CMD_REJECT:
1029 iscsi_conn_printk(KERN_ERR, conn,
1030 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1031 "immediate commands.\n",
1032 opcode, rejected_pdu.itt);
1034 * We only send one TMF at a time so if the target could not
1035 * handle it, then it should get fixed (RFC mandates that
1036 * a target can handle one immediate TMF per conn).
1038 * For nops-outs, we could have sent more than one if
1039 * the target is sending us lots of nop-ins
1041 if (opcode != ISCSI_OP_NOOP_OUT)
1044 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1046 * nop-out in response to target's nop-out rejected.
1049 /* In RX path we are under back lock */
1050 spin_unlock(&conn->session->back_lock);
1051 spin_lock(&conn->session->frwd_lock);
1052 iscsi_send_nopout(conn,
1053 (struct iscsi_nopin*)&rejected_pdu);
1054 spin_unlock(&conn->session->frwd_lock);
1055 spin_lock(&conn->session->back_lock);
1057 struct iscsi_task *task;
1059 * Our nop as ping got dropped. We know the target
1060 * and transport are ok so just clean up
1062 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1064 iscsi_conn_printk(KERN_ERR, conn,
1065 "Invalid pdu reject. Could "
1066 "not lookup rejected task.\n");
1067 rc = ISCSI_ERR_BAD_ITT;
1069 rc = iscsi_nop_out_rsp(task,
1070 (struct iscsi_nopin*)&rejected_pdu,
1075 iscsi_conn_printk(KERN_ERR, conn,
1076 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1077 "code 0x%x\n", rejected_pdu.opcode,
1078 rejected_pdu.itt, reject->reason);
1085 * iscsi_itt_to_task - look up task by itt
1086 * @conn: iscsi connection
1089 * This should be used for mgmt tasks like login and nops, or if
1090 * the LDD's itt space does not include the session age.
1092 * The session back_lock must be held.
1094 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1096 struct iscsi_session *session = conn->session;
1099 if (itt == RESERVED_ITT)
1102 if (session->tt->parse_pdu_itt)
1103 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1106 if (i >= session->cmds_max)
1109 return session->cmds[i];
1111 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1114 * __iscsi_complete_pdu - complete pdu
1116 * @hdr: iscsi header
1117 * @data: data buffer
1118 * @datalen: len of data buffer
1120 * Completes pdu processing by freeing any resources allocated at
1121 * queuecommand or send generic. session back_lock must be held and verify
1122 * itt must have been called.
1124 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1125 char *data, int datalen)
1127 struct iscsi_session *session = conn->session;
1128 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1129 struct iscsi_task *task;
1132 conn->last_recv = jiffies;
1133 rc = iscsi_verify_itt(conn, hdr->itt);
1137 if (hdr->itt != RESERVED_ITT)
1138 itt = get_itt(hdr->itt);
1142 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1143 opcode, conn->id, itt, datalen);
1146 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1149 case ISCSI_OP_NOOP_IN:
1151 rc = ISCSI_ERR_PROTO;
1155 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1158 /* In RX path we are under back lock */
1159 spin_unlock(&session->back_lock);
1160 spin_lock(&session->frwd_lock);
1161 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1162 spin_unlock(&session->frwd_lock);
1163 spin_lock(&session->back_lock);
1165 case ISCSI_OP_REJECT:
1166 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1168 case ISCSI_OP_ASYNC_EVENT:
1169 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1170 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1171 rc = ISCSI_ERR_CONN_FAILED;
1174 rc = ISCSI_ERR_BAD_OPCODE;
1181 case ISCSI_OP_SCSI_CMD_RSP:
1182 case ISCSI_OP_SCSI_DATA_IN:
1183 task = iscsi_itt_to_ctask(conn, hdr->itt);
1185 return ISCSI_ERR_BAD_ITT;
1186 task->last_xfer = jiffies;
1190 * LLD handles R2Ts if they need to.
1193 case ISCSI_OP_LOGOUT_RSP:
1194 case ISCSI_OP_LOGIN_RSP:
1195 case ISCSI_OP_TEXT_RSP:
1196 case ISCSI_OP_SCSI_TMFUNC_RSP:
1197 case ISCSI_OP_NOOP_IN:
1198 task = iscsi_itt_to_task(conn, hdr->itt);
1200 return ISCSI_ERR_BAD_ITT;
1203 return ISCSI_ERR_BAD_OPCODE;
1207 case ISCSI_OP_SCSI_CMD_RSP:
1208 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1210 case ISCSI_OP_SCSI_DATA_IN:
1211 iscsi_data_in_rsp(conn, hdr, task);
1213 case ISCSI_OP_LOGOUT_RSP:
1214 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1216 rc = ISCSI_ERR_PROTO;
1219 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1221 case ISCSI_OP_LOGIN_RSP:
1222 case ISCSI_OP_TEXT_RSP:
1223 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1225 * login related PDU's exp_statsn is handled in
1229 case ISCSI_OP_SCSI_TMFUNC_RSP:
1230 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1232 rc = ISCSI_ERR_PROTO;
1236 iscsi_tmf_rsp(conn, hdr);
1237 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1239 case ISCSI_OP_NOOP_IN:
1240 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1241 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1242 rc = ISCSI_ERR_PROTO;
1245 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1247 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1251 rc = ISCSI_ERR_BAD_OPCODE;
1258 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1259 rc = ISCSI_ERR_CONN_FAILED;
1260 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1263 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1265 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1266 char *data, int datalen)
1270 spin_lock(&conn->session->back_lock);
1271 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1272 spin_unlock(&conn->session->back_lock);
1275 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1277 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1279 struct iscsi_session *session = conn->session;
1282 if (itt == RESERVED_ITT)
1285 if (session->tt->parse_pdu_itt)
1286 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1289 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1292 if (age != session->age) {
1293 iscsi_conn_printk(KERN_ERR, conn,
1294 "received itt %x expected session age (%x)\n",
1295 (__force u32)itt, session->age);
1296 return ISCSI_ERR_BAD_ITT;
1299 if (i >= session->cmds_max) {
1300 iscsi_conn_printk(KERN_ERR, conn,
1301 "received invalid itt index %u (max cmds "
1302 "%u.\n", i, session->cmds_max);
1303 return ISCSI_ERR_BAD_ITT;
1307 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1310 * iscsi_itt_to_ctask - look up ctask by itt
1311 * @conn: iscsi connection
1314 * This should be used for cmd tasks.
1316 * The session back_lock must be held.
1318 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1320 struct iscsi_task *task;
1322 if (iscsi_verify_itt(conn, itt))
1325 task = iscsi_itt_to_task(conn, itt);
1326 if (!task || !task->sc)
1329 if (task->sc->SCp.phase != conn->session->age) {
1330 iscsi_session_printk(KERN_ERR, conn->session,
1331 "task's session age %d, expected %d\n",
1332 task->sc->SCp.phase, conn->session->age);
1338 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1340 void iscsi_session_failure(struct iscsi_session *session,
1343 struct iscsi_conn *conn;
1346 spin_lock_bh(&session->frwd_lock);
1347 conn = session->leadconn;
1348 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1349 spin_unlock_bh(&session->frwd_lock);
1353 dev = get_device(&conn->cls_conn->dev);
1354 spin_unlock_bh(&session->frwd_lock);
1358 * if the host is being removed bypass the connection
1359 * recovery initialization because we are going to kill
1362 if (err == ISCSI_ERR_INVALID_HOST)
1363 iscsi_conn_error_event(conn->cls_conn, err);
1365 iscsi_conn_failure(conn, err);
1368 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1370 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1372 struct iscsi_session *session = conn->session;
1374 spin_lock_bh(&session->frwd_lock);
1375 if (session->state == ISCSI_STATE_FAILED) {
1376 spin_unlock_bh(&session->frwd_lock);
1380 if (conn->stop_stage == 0)
1381 session->state = ISCSI_STATE_FAILED;
1382 spin_unlock_bh(&session->frwd_lock);
1384 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1385 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1386 iscsi_conn_error_event(conn->cls_conn, err);
1388 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1390 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1392 struct iscsi_session *session = conn->session;
1395 * Check for iSCSI window and take care of CmdSN wrap-around
1397 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1398 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1399 "%u MaxCmdSN %u CmdSN %u/%u\n",
1400 session->exp_cmdsn, session->max_cmdsn,
1401 session->cmdsn, session->queued_cmdsn);
1407 static int iscsi_xmit_task(struct iscsi_conn *conn)
1409 struct iscsi_task *task = conn->task;
1412 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1415 spin_lock_bh(&conn->session->back_lock);
1416 if (conn->task == NULL) {
1417 spin_unlock_bh(&conn->session->back_lock);
1420 __iscsi_get_task(task);
1421 spin_unlock_bh(&conn->session->back_lock);
1422 spin_unlock_bh(&conn->session->frwd_lock);
1423 rc = conn->session->tt->xmit_task(task);
1424 spin_lock_bh(&conn->session->frwd_lock);
1426 /* done with this task */
1427 task->last_xfer = jiffies;
1430 /* regular RX path uses back_lock */
1431 spin_lock(&conn->session->back_lock);
1432 __iscsi_put_task(task);
1433 spin_unlock(&conn->session->back_lock);
1438 * iscsi_requeue_task - requeue task to run from session workqueue
1439 * @task: task to requeue
1441 * LLDs that need to run a task from the session workqueue should call
1442 * this. The session frwd_lock must be held. This should only be called
1443 * by software drivers.
1445 void iscsi_requeue_task(struct iscsi_task *task)
1447 struct iscsi_conn *conn = task->conn;
1450 * this may be on the requeue list already if the xmit_task callout
1451 * is handling the r2ts while we are adding new ones
1453 spin_lock_bh(&conn->taskqueuelock);
1454 if (list_empty(&task->running))
1455 list_add_tail(&task->running, &conn->requeue);
1456 spin_unlock_bh(&conn->taskqueuelock);
1457 iscsi_conn_queue_work(conn);
1459 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1462 * iscsi_data_xmit - xmit any command into the scheduled connection
1463 * @conn: iscsi connection
1466 * The function can return -EAGAIN in which case the caller must
1467 * re-schedule it again later or recover. '0' return code means
1470 static int iscsi_data_xmit(struct iscsi_conn *conn)
1472 struct iscsi_task *task;
1475 spin_lock_bh(&conn->session->frwd_lock);
1476 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1477 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1478 spin_unlock_bh(&conn->session->frwd_lock);
1483 rc = iscsi_xmit_task(conn);
1489 * process mgmt pdus like nops before commands since we should
1490 * only have one nop-out as a ping from us and targets should not
1491 * overflow us with nop-ins
1493 spin_lock_bh(&conn->taskqueuelock);
1495 while (!list_empty(&conn->mgmtqueue)) {
1496 conn->task = list_entry(conn->mgmtqueue.next,
1497 struct iscsi_task, running);
1498 list_del_init(&conn->task->running);
1499 spin_unlock_bh(&conn->taskqueuelock);
1500 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1501 /* regular RX path uses back_lock */
1502 spin_lock_bh(&conn->session->back_lock);
1503 __iscsi_put_task(conn->task);
1504 spin_unlock_bh(&conn->session->back_lock);
1506 spin_lock_bh(&conn->taskqueuelock);
1509 rc = iscsi_xmit_task(conn);
1512 spin_lock_bh(&conn->taskqueuelock);
1515 /* process pending command queue */
1516 while (!list_empty(&conn->cmdqueue)) {
1517 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1519 list_del_init(&conn->task->running);
1520 spin_unlock_bh(&conn->taskqueuelock);
1521 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1522 fail_scsi_task(conn->task, DID_IMM_RETRY);
1523 spin_lock_bh(&conn->taskqueuelock);
1526 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1528 if (rc == -ENOMEM || rc == -EACCES) {
1529 spin_lock_bh(&conn->taskqueuelock);
1530 list_add_tail(&conn->task->running,
1533 spin_unlock_bh(&conn->taskqueuelock);
1536 fail_scsi_task(conn->task, DID_ABORT);
1537 spin_lock_bh(&conn->taskqueuelock);
1540 rc = iscsi_xmit_task(conn);
1544 * we could continuously get new task requests so
1545 * we need to check the mgmt queue for nops that need to
1546 * be sent to aviod starvation
1548 spin_lock_bh(&conn->taskqueuelock);
1549 if (!list_empty(&conn->mgmtqueue))
1553 while (!list_empty(&conn->requeue)) {
1555 * we always do fastlogout - conn stop code will clean up.
1557 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1560 task = list_entry(conn->requeue.next, struct iscsi_task,
1562 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1566 list_del_init(&conn->task->running);
1567 conn->task->state = ISCSI_TASK_RUNNING;
1568 spin_unlock_bh(&conn->taskqueuelock);
1569 rc = iscsi_xmit_task(conn);
1572 spin_lock_bh(&conn->taskqueuelock);
1573 if (!list_empty(&conn->mgmtqueue))
1576 spin_unlock_bh(&conn->taskqueuelock);
1577 spin_unlock_bh(&conn->session->frwd_lock);
1581 spin_unlock_bh(&conn->session->frwd_lock);
1585 static void iscsi_xmitworker(struct work_struct *work)
1587 struct iscsi_conn *conn =
1588 container_of(work, struct iscsi_conn, xmitwork);
1591 * serialize Xmit worker on a per-connection basis.
1594 rc = iscsi_data_xmit(conn);
1595 } while (rc >= 0 || rc == -EAGAIN);
1598 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1599 struct scsi_cmnd *sc)
1601 struct iscsi_task *task;
1603 if (!kfifo_out(&conn->session->cmdpool.queue,
1604 (void *) &task, sizeof(void *)))
1607 sc->SCp.phase = conn->session->age;
1608 sc->SCp.ptr = (char *) task;
1610 refcount_set(&task->refcount, 1);
1611 task->state = ISCSI_TASK_PENDING;
1614 task->have_checked_conn = false;
1615 task->last_timeout = jiffies;
1616 task->last_xfer = jiffies;
1617 task->protected = false;
1618 INIT_LIST_HEAD(&task->running);
1623 FAILURE_BAD_HOST = 1,
1624 FAILURE_SESSION_FAILED,
1625 FAILURE_SESSION_FREED,
1626 FAILURE_WINDOW_CLOSED,
1628 FAILURE_SESSION_TERMINATE,
1629 FAILURE_SESSION_IN_RECOVERY,
1630 FAILURE_SESSION_RECOVERY_TIMEOUT,
1631 FAILURE_SESSION_LOGGING_OUT,
1632 FAILURE_SESSION_NOT_READY,
1635 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1637 struct iscsi_cls_session *cls_session;
1638 struct iscsi_host *ihost;
1640 struct iscsi_session *session;
1641 struct iscsi_conn *conn;
1642 struct iscsi_task *task = NULL;
1647 ihost = shost_priv(host);
1649 cls_session = starget_to_session(scsi_target(sc->device));
1650 session = cls_session->dd_data;
1651 spin_lock_bh(&session->frwd_lock);
1653 reason = iscsi_session_chkready(cls_session);
1655 sc->result = reason;
1659 if (session->state != ISCSI_STATE_LOGGED_IN) {
1661 * to handle the race between when we set the recovery state
1662 * and block the session we requeue here (commands could
1663 * be entering our queuecommand while a block is starting
1664 * up because the block code is not locked)
1666 switch (session->state) {
1667 case ISCSI_STATE_FAILED:
1669 * cmds should fail during shutdown, if the session
1670 * state is bad, allowing completion to happen
1672 if (unlikely(system_state != SYSTEM_RUNNING)) {
1673 reason = FAILURE_SESSION_FAILED;
1674 sc->result = DID_NO_CONNECT << 16;
1678 case ISCSI_STATE_IN_RECOVERY:
1679 reason = FAILURE_SESSION_IN_RECOVERY;
1680 sc->result = DID_IMM_RETRY << 16;
1682 case ISCSI_STATE_LOGGING_OUT:
1683 reason = FAILURE_SESSION_LOGGING_OUT;
1684 sc->result = DID_IMM_RETRY << 16;
1686 case ISCSI_STATE_RECOVERY_FAILED:
1687 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1688 sc->result = DID_TRANSPORT_FAILFAST << 16;
1690 case ISCSI_STATE_TERMINATE:
1691 reason = FAILURE_SESSION_TERMINATE;
1692 sc->result = DID_NO_CONNECT << 16;
1695 reason = FAILURE_SESSION_FREED;
1696 sc->result = DID_NO_CONNECT << 16;
1701 conn = session->leadconn;
1703 reason = FAILURE_SESSION_FREED;
1704 sc->result = DID_NO_CONNECT << 16;
1708 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1709 reason = FAILURE_SESSION_IN_RECOVERY;
1710 sc->result = DID_REQUEUE << 16;
1714 if (iscsi_check_cmdsn_window_closed(conn)) {
1715 reason = FAILURE_WINDOW_CLOSED;
1719 task = iscsi_alloc_task(conn, sc);
1721 reason = FAILURE_OOM;
1725 if (!ihost->workq) {
1726 reason = iscsi_prep_scsi_cmd_pdu(task);
1728 if (reason == -ENOMEM || reason == -EACCES) {
1729 reason = FAILURE_OOM;
1732 sc->result = DID_ABORT << 16;
1736 if (session->tt->xmit_task(task)) {
1738 reason = FAILURE_SESSION_NOT_READY;
1742 spin_lock_bh(&conn->taskqueuelock);
1743 list_add_tail(&task->running, &conn->cmdqueue);
1744 spin_unlock_bh(&conn->taskqueuelock);
1745 iscsi_conn_queue_work(conn);
1748 session->queued_cmdsn++;
1749 spin_unlock_bh(&session->frwd_lock);
1753 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1755 spin_unlock_bh(&session->frwd_lock);
1756 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1757 sc->cmnd[0], reason);
1758 return SCSI_MLQUEUE_TARGET_BUSY;
1761 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1763 spin_unlock_bh(&session->frwd_lock);
1764 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1765 sc->cmnd[0], reason);
1766 scsi_set_resid(sc, scsi_bufflen(sc));
1770 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1772 int iscsi_target_alloc(struct scsi_target *starget)
1774 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1775 struct iscsi_session *session = cls_session->dd_data;
1777 starget->can_queue = session->scsi_cmds_max;
1780 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1782 static void iscsi_tmf_timedout(struct timer_list *t)
1784 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
1785 struct iscsi_session *session = conn->session;
1787 spin_lock(&session->frwd_lock);
1788 if (conn->tmf_state == TMF_QUEUED) {
1789 conn->tmf_state = TMF_TIMEDOUT;
1790 ISCSI_DBG_EH(session, "tmf timedout\n");
1791 /* unblock eh_abort() */
1792 wake_up(&conn->ehwait);
1794 spin_unlock(&session->frwd_lock);
1797 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1798 struct iscsi_tm *hdr, int age,
1800 __must_hold(&session->frwd_lock)
1802 struct iscsi_session *session = conn->session;
1803 struct iscsi_task *task;
1805 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1808 spin_unlock_bh(&session->frwd_lock);
1809 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1810 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1811 spin_lock_bh(&session->frwd_lock);
1814 conn->tmfcmd_pdus_cnt++;
1815 conn->tmf_timer.expires = timeout * HZ + jiffies;
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 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1932 enum blk_eh_timer_return rc = BLK_EH_DONE;
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.
1955 if (session->state != ISCSI_STATE_LOGGED_IN) {
1957 * During shutdown, if session is prematurely disconnected,
1958 * recovery won't happen and there will be hung cmds. Not
1959 * handling cmds would trigger EH, also bad in this case.
1960 * Instead, handle cmd, allow completion to happen and let
1961 * upper layer to deal with the result.
1963 if (unlikely(system_state != SYSTEM_RUNNING)) {
1964 sc->result = DID_NO_CONNECT << 16;
1965 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
1970 * We are probably in the middle of iscsi recovery so let
1971 * that complete and handle the error.
1973 rc = BLK_EH_RESET_TIMER;
1977 conn = session->leadconn;
1979 /* In the middle of shuting down */
1980 rc = BLK_EH_RESET_TIMER;
1985 * If we have sent (at least queued to the network layer) a pdu or
1986 * recvd one for the task since the last timeout ask for
1987 * more time. If on the next timeout we have not made progress
1988 * we can check if it is the task or connection when we send the
1991 if (time_after(task->last_xfer, task->last_timeout)) {
1992 ISCSI_DBG_EH(session, "Command making progress. Asking "
1993 "scsi-ml for more time to complete. "
1994 "Last data xfer at %lu. Last timeout was at "
1995 "%lu\n.", task->last_xfer, task->last_timeout);
1996 task->have_checked_conn = false;
1997 rc = BLK_EH_RESET_TIMER;
2001 if (!conn->recv_timeout && !conn->ping_timeout)
2004 * if the ping timedout then we are in the middle of cleaning up
2005 * and can let the iscsi eh handle it
2007 if (iscsi_has_ping_timed_out(conn)) {
2008 rc = BLK_EH_RESET_TIMER;
2012 for (i = 0; i < conn->session->cmds_max; i++) {
2013 running_task = conn->session->cmds[i];
2014 if (!running_task->sc || running_task == task ||
2015 running_task->state != ISCSI_TASK_RUNNING)
2019 * Only check if cmds started before this one have made
2020 * progress, or this could never fail
2022 if (time_after(running_task->sc->jiffies_at_alloc,
2023 task->sc->jiffies_at_alloc))
2026 if (time_after(running_task->last_xfer, task->last_timeout)) {
2028 * This task has not made progress, but a task
2029 * started before us has transferred data since
2030 * we started/last-checked. We could be queueing
2031 * too many tasks or the LU is bad.
2033 * If the device is bad the cmds ahead of us on
2034 * other devs will complete, and this loop will
2035 * eventually fail starting the scsi eh.
2037 ISCSI_DBG_EH(session, "Command has not made progress "
2038 "but commands ahead of it have. "
2039 "Asking scsi-ml for more time to "
2040 "complete. Our last xfer vs running task "
2041 "last xfer %lu/%lu. Last check %lu.\n",
2042 task->last_xfer, running_task->last_xfer,
2043 task->last_timeout);
2044 rc = BLK_EH_RESET_TIMER;
2049 /* Assumes nop timeout is shorter than scsi cmd timeout */
2050 if (task->have_checked_conn)
2054 * Checking the transport already or nop from a cmd timeout still
2057 if (conn->ping_task) {
2058 task->have_checked_conn = true;
2059 rc = BLK_EH_RESET_TIMER;
2063 /* Make sure there is a transport check done */
2064 iscsi_send_nopout(conn, NULL);
2065 task->have_checked_conn = true;
2066 rc = BLK_EH_RESET_TIMER;
2070 task->last_timeout = jiffies;
2071 spin_unlock(&session->frwd_lock);
2072 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2073 "timer reset" : "shutdown or nh");
2076 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2078 static void iscsi_check_transport_timeouts(struct timer_list *t)
2080 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
2081 struct iscsi_session *session = conn->session;
2082 unsigned long recv_timeout, next_timeout = 0, last_recv;
2084 spin_lock(&session->frwd_lock);
2085 if (session->state != ISCSI_STATE_LOGGED_IN)
2088 recv_timeout = conn->recv_timeout;
2093 last_recv = conn->last_recv;
2095 if (iscsi_has_ping_timed_out(conn)) {
2096 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2097 "expired, recv timeout %d, last rx %lu, "
2098 "last ping %lu, now %lu\n",
2099 conn->ping_timeout, conn->recv_timeout,
2100 last_recv, conn->last_ping, jiffies);
2101 spin_unlock(&session->frwd_lock);
2102 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2106 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2107 /* send a ping to try to provoke some traffic */
2108 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2109 if (iscsi_send_nopout(conn, NULL))
2110 next_timeout = jiffies + (1 * HZ);
2112 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2114 next_timeout = last_recv + recv_timeout;
2116 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2117 mod_timer(&conn->transport_timer, next_timeout);
2119 spin_unlock(&session->frwd_lock);
2122 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2123 struct iscsi_tm *hdr)
2125 memset(hdr, 0, sizeof(*hdr));
2126 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2127 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2128 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2129 hdr->lun = task->lun;
2130 hdr->rtt = task->hdr_itt;
2131 hdr->refcmdsn = task->cmdsn;
2134 int iscsi_eh_abort(struct scsi_cmnd *sc)
2136 struct iscsi_cls_session *cls_session;
2137 struct iscsi_session *session;
2138 struct iscsi_conn *conn;
2139 struct iscsi_task *task;
2140 struct iscsi_tm *hdr;
2143 cls_session = starget_to_session(scsi_target(sc->device));
2144 session = cls_session->dd_data;
2146 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2148 mutex_lock(&session->eh_mutex);
2149 spin_lock_bh(&session->frwd_lock);
2151 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2155 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2157 spin_unlock_bh(&session->frwd_lock);
2158 mutex_unlock(&session->eh_mutex);
2163 * If we are not logged in or we have started a new session
2164 * then let the host reset code handle this
2166 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2167 sc->SCp.phase != session->age) {
2168 spin_unlock_bh(&session->frwd_lock);
2169 mutex_unlock(&session->eh_mutex);
2170 ISCSI_DBG_EH(session, "failing abort due to dropped "
2175 conn = session->leadconn;
2176 conn->eh_abort_cnt++;
2179 task = (struct iscsi_task *)sc->SCp.ptr;
2180 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2183 /* task completed before time out */
2185 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2189 if (task->state == ISCSI_TASK_PENDING) {
2190 fail_scsi_task(task, DID_ABORT);
2194 /* only have one tmf outstanding at a time */
2195 if (conn->tmf_state != TMF_INITIAL)
2197 conn->tmf_state = TMF_QUEUED;
2200 iscsi_prep_abort_task_pdu(task, hdr);
2202 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2205 switch (conn->tmf_state) {
2207 spin_unlock_bh(&session->frwd_lock);
2209 * stop tx side incase the target had sent a abort rsp but
2210 * the initiator was still writing out data.
2212 iscsi_suspend_tx(conn);
2214 * we do not stop the recv side because targets have been
2215 * good and have never sent us a successful tmf response
2216 * then sent more data for the cmd.
2218 spin_lock_bh(&session->frwd_lock);
2219 fail_scsi_task(task, DID_ABORT);
2220 conn->tmf_state = TMF_INITIAL;
2221 memset(hdr, 0, sizeof(*hdr));
2222 spin_unlock_bh(&session->frwd_lock);
2223 iscsi_start_tx(conn);
2224 goto success_unlocked;
2226 spin_unlock_bh(&session->frwd_lock);
2227 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2228 goto failed_unlocked;
2231 conn->tmf_state = TMF_INITIAL;
2232 memset(hdr, 0, sizeof(*hdr));
2233 /* task completed before tmf abort response */
2234 ISCSI_DBG_EH(session, "sc completed while abort in "
2240 conn->tmf_state = TMF_INITIAL;
2245 spin_unlock_bh(&session->frwd_lock);
2247 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2249 mutex_unlock(&session->eh_mutex);
2253 spin_unlock_bh(&session->frwd_lock);
2255 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2256 task ? task->itt : 0);
2257 mutex_unlock(&session->eh_mutex);
2260 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2262 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2264 memset(hdr, 0, sizeof(*hdr));
2265 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2266 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2267 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2268 int_to_scsilun(sc->device->lun, &hdr->lun);
2269 hdr->rtt = RESERVED_ITT;
2272 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2274 struct iscsi_cls_session *cls_session;
2275 struct iscsi_session *session;
2276 struct iscsi_conn *conn;
2277 struct iscsi_tm *hdr;
2280 cls_session = starget_to_session(scsi_target(sc->device));
2281 session = cls_session->dd_data;
2283 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2286 mutex_lock(&session->eh_mutex);
2287 spin_lock_bh(&session->frwd_lock);
2289 * Just check if we are not logged in. We cannot check for
2290 * the phase because the reset could come from a ioctl.
2292 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2294 conn = session->leadconn;
2296 /* only have one tmf outstanding at a time */
2297 if (conn->tmf_state != TMF_INITIAL)
2299 conn->tmf_state = TMF_QUEUED;
2302 iscsi_prep_lun_reset_pdu(sc, hdr);
2304 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2305 session->lu_reset_timeout)) {
2310 switch (conn->tmf_state) {
2314 spin_unlock_bh(&session->frwd_lock);
2315 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2318 conn->tmf_state = TMF_INITIAL;
2323 spin_unlock_bh(&session->frwd_lock);
2325 iscsi_suspend_tx(conn);
2327 spin_lock_bh(&session->frwd_lock);
2328 memset(hdr, 0, sizeof(*hdr));
2329 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2330 conn->tmf_state = TMF_INITIAL;
2331 spin_unlock_bh(&session->frwd_lock);
2333 iscsi_start_tx(conn);
2337 spin_unlock_bh(&session->frwd_lock);
2339 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2340 rc == SUCCESS ? "SUCCESS" : "FAILED");
2341 mutex_unlock(&session->eh_mutex);
2344 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2346 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2348 struct iscsi_session *session = cls_session->dd_data;
2350 spin_lock_bh(&session->frwd_lock);
2351 if (session->state != ISCSI_STATE_LOGGED_IN) {
2352 session->state = ISCSI_STATE_RECOVERY_FAILED;
2353 if (session->leadconn)
2354 wake_up(&session->leadconn->ehwait);
2356 spin_unlock_bh(&session->frwd_lock);
2358 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2361 * iscsi_eh_session_reset - drop session and attempt relogin
2364 * This function will wait for a relogin, session termination from
2365 * userspace, or a recovery/replacement timeout.
2367 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2369 struct iscsi_cls_session *cls_session;
2370 struct iscsi_session *session;
2371 struct iscsi_conn *conn;
2373 cls_session = starget_to_session(scsi_target(sc->device));
2374 session = cls_session->dd_data;
2375 conn = session->leadconn;
2377 mutex_lock(&session->eh_mutex);
2378 spin_lock_bh(&session->frwd_lock);
2379 if (session->state == ISCSI_STATE_TERMINATE) {
2381 ISCSI_DBG_EH(session,
2382 "failing session reset: Could not log back into "
2383 "%s [age %d]\n", session->targetname,
2385 spin_unlock_bh(&session->frwd_lock);
2386 mutex_unlock(&session->eh_mutex);
2390 spin_unlock_bh(&session->frwd_lock);
2391 mutex_unlock(&session->eh_mutex);
2393 * we drop the lock here but the leadconn cannot be destoyed while
2394 * we are in the scsi eh
2396 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2398 ISCSI_DBG_EH(session, "wait for relogin\n");
2399 wait_event_interruptible(conn->ehwait,
2400 session->state == ISCSI_STATE_TERMINATE ||
2401 session->state == ISCSI_STATE_LOGGED_IN ||
2402 session->state == ISCSI_STATE_RECOVERY_FAILED);
2403 if (signal_pending(current))
2404 flush_signals(current);
2406 mutex_lock(&session->eh_mutex);
2407 spin_lock_bh(&session->frwd_lock);
2408 if (session->state == ISCSI_STATE_LOGGED_IN) {
2409 ISCSI_DBG_EH(session,
2410 "session reset succeeded for %s,%s\n",
2411 session->targetname, conn->persistent_address);
2414 spin_unlock_bh(&session->frwd_lock);
2415 mutex_unlock(&session->eh_mutex);
2418 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2420 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2422 memset(hdr, 0, sizeof(*hdr));
2423 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2424 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2425 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2426 hdr->rtt = RESERVED_ITT;
2430 * iscsi_eh_target_reset - reset target
2433 * This will attempt to send a warm target reset.
2435 static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2437 struct iscsi_cls_session *cls_session;
2438 struct iscsi_session *session;
2439 struct iscsi_conn *conn;
2440 struct iscsi_tm *hdr;
2443 cls_session = starget_to_session(scsi_target(sc->device));
2444 session = cls_session->dd_data;
2446 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2447 session->targetname);
2449 mutex_lock(&session->eh_mutex);
2450 spin_lock_bh(&session->frwd_lock);
2452 * Just check if we are not logged in. We cannot check for
2453 * the phase because the reset could come from a ioctl.
2455 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2457 conn = session->leadconn;
2459 /* only have one tmf outstanding at a time */
2460 if (conn->tmf_state != TMF_INITIAL)
2462 conn->tmf_state = TMF_QUEUED;
2465 iscsi_prep_tgt_reset_pdu(sc, hdr);
2467 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2468 session->tgt_reset_timeout)) {
2473 switch (conn->tmf_state) {
2477 spin_unlock_bh(&session->frwd_lock);
2478 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2481 conn->tmf_state = TMF_INITIAL;
2486 spin_unlock_bh(&session->frwd_lock);
2488 iscsi_suspend_tx(conn);
2490 spin_lock_bh(&session->frwd_lock);
2491 memset(hdr, 0, sizeof(*hdr));
2492 fail_scsi_tasks(conn, -1, DID_ERROR);
2493 conn->tmf_state = TMF_INITIAL;
2494 spin_unlock_bh(&session->frwd_lock);
2496 iscsi_start_tx(conn);
2500 spin_unlock_bh(&session->frwd_lock);
2502 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2503 rc == SUCCESS ? "SUCCESS" : "FAILED");
2504 mutex_unlock(&session->eh_mutex);
2509 * iscsi_eh_recover_target - reset target and possibly the session
2512 * This will attempt to send a warm target reset. If that fails,
2513 * we will escalate to ERL0 session recovery.
2515 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2519 rc = iscsi_eh_target_reset(sc);
2521 rc = iscsi_eh_session_reset(sc);
2524 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2527 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2528 * should be accessed via kfifo_{get,put} on q->queue.
2529 * Optionally, the caller can obtain the array of object pointers
2530 * by passing in a non-NULL @items pointer
2533 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2535 int i, num_arrays = 1;
2537 memset(q, 0, sizeof(*q));
2541 /* If the user passed an items pointer, he wants a copy of
2545 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
2546 if (q->pool == NULL)
2549 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2551 for (i = 0; i < max; i++) {
2552 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2553 if (q->pool[i] == NULL) {
2557 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2561 *items = q->pool + max;
2562 memcpy(*items, q->pool, max * sizeof(void *));
2571 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2573 void iscsi_pool_free(struct iscsi_pool *q)
2577 for (i = 0; i < q->max; i++)
2581 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2584 * iscsi_host_add - add host to system
2586 * @pdev: parent device
2588 * This should be called by partial offload and software iscsi drivers
2589 * to add a host to the system.
2591 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2593 if (!shost->can_queue)
2594 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2596 if (!shost->cmd_per_lun)
2597 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2599 return scsi_add_host(shost, pdev);
2601 EXPORT_SYMBOL_GPL(iscsi_host_add);
2604 * iscsi_host_alloc - allocate a host and driver data
2605 * @sht: scsi host template
2606 * @dd_data_size: driver host data size
2607 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2609 * This should be called by partial offload and software iscsi drivers.
2610 * To access the driver specific memory use the iscsi_host_priv() macro.
2612 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2613 int dd_data_size, bool xmit_can_sleep)
2615 struct Scsi_Host *shost;
2616 struct iscsi_host *ihost;
2618 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2621 ihost = shost_priv(shost);
2623 if (xmit_can_sleep) {
2624 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2625 "iscsi_q_%d", shost->host_no);
2626 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2631 spin_lock_init(&ihost->lock);
2632 ihost->state = ISCSI_HOST_SETUP;
2633 ihost->num_sessions = 0;
2634 init_waitqueue_head(&ihost->session_removal_wq);
2638 scsi_host_put(shost);
2641 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2643 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2645 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2649 * iscsi_host_remove - remove host and sessions
2652 * If there are any sessions left, this will initiate the removal and wait
2653 * for the completion.
2655 void iscsi_host_remove(struct Scsi_Host *shost)
2657 struct iscsi_host *ihost = shost_priv(shost);
2658 unsigned long flags;
2660 spin_lock_irqsave(&ihost->lock, flags);
2661 ihost->state = ISCSI_HOST_REMOVED;
2662 spin_unlock_irqrestore(&ihost->lock, flags);
2664 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2665 wait_event_interruptible(ihost->session_removal_wq,
2666 ihost->num_sessions == 0);
2667 if (signal_pending(current))
2668 flush_signals(current);
2670 scsi_remove_host(shost);
2672 destroy_workqueue(ihost->workq);
2674 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2676 void iscsi_host_free(struct Scsi_Host *shost)
2678 struct iscsi_host *ihost = shost_priv(shost);
2680 kfree(ihost->netdev);
2681 kfree(ihost->hwaddress);
2682 kfree(ihost->initiatorname);
2683 scsi_host_put(shost);
2685 EXPORT_SYMBOL_GPL(iscsi_host_free);
2687 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2689 struct iscsi_host *ihost = shost_priv(shost);
2690 unsigned long flags;
2692 shost = scsi_host_get(shost);
2694 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2695 "of session teardown event because host already "
2700 spin_lock_irqsave(&ihost->lock, flags);
2701 ihost->num_sessions--;
2702 if (ihost->num_sessions == 0)
2703 wake_up(&ihost->session_removal_wq);
2704 spin_unlock_irqrestore(&ihost->lock, flags);
2705 scsi_host_put(shost);
2709 * iscsi_session_setup - create iscsi cls session and host and session
2710 * @iscsit: iscsi transport template
2712 * @cmds_max: session can queue
2713 * @dd_size: private driver data size, added to session allocation size
2714 * @cmd_task_size: LLD task private data size
2715 * @initial_cmdsn: initial CmdSN
2716 * @id: target ID to add to this session
2718 * This can be used by software iscsi_transports that allocate
2719 * a session per scsi host.
2721 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2722 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2723 * for nop handling and login/logout requests.
2725 struct iscsi_cls_session *
2726 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2727 uint16_t cmds_max, int dd_size, int cmd_task_size,
2728 uint32_t initial_cmdsn, unsigned int id)
2730 struct iscsi_host *ihost = shost_priv(shost);
2731 struct iscsi_session *session;
2732 struct iscsi_cls_session *cls_session;
2733 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2734 unsigned long flags;
2736 spin_lock_irqsave(&ihost->lock, flags);
2737 if (ihost->state == ISCSI_HOST_REMOVED) {
2738 spin_unlock_irqrestore(&ihost->lock, flags);
2741 ihost->num_sessions++;
2742 spin_unlock_irqrestore(&ihost->lock, flags);
2745 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2747 * The iscsi layer needs some tasks for nop handling and tmfs,
2748 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2749 * + 1 command for scsi IO.
2751 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2752 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2753 "must be a power of two that is at least %d.\n",
2754 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2755 goto dec_session_count;
2758 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2759 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2760 "must be a power of 2 less than or equal to %d.\n",
2761 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2762 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2765 if (!is_power_of_2(total_cmds)) {
2766 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2767 "must be a power of 2.\n", total_cmds);
2768 total_cmds = rounddown_pow_of_two(total_cmds);
2769 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2771 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2774 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2776 cls_session = iscsi_alloc_session(shost, iscsit,
2777 sizeof(struct iscsi_session) +
2780 goto dec_session_count;
2781 session = cls_session->dd_data;
2782 session->cls_session = cls_session;
2783 session->host = shost;
2784 session->state = ISCSI_STATE_FREE;
2785 session->fast_abort = 1;
2786 session->tgt_reset_timeout = 30;
2787 session->lu_reset_timeout = 15;
2788 session->abort_timeout = 10;
2789 session->scsi_cmds_max = scsi_cmds;
2790 session->cmds_max = total_cmds;
2791 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2792 session->exp_cmdsn = initial_cmdsn + 1;
2793 session->max_cmdsn = initial_cmdsn + 1;
2794 session->max_r2t = 1;
2795 session->tt = iscsit;
2796 session->dd_data = cls_session->dd_data + sizeof(*session);
2798 mutex_init(&session->eh_mutex);
2799 spin_lock_init(&session->frwd_lock);
2800 spin_lock_init(&session->back_lock);
2802 /* initialize SCSI PDU commands pool */
2803 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2804 (void***)&session->cmds,
2805 cmd_task_size + sizeof(struct iscsi_task)))
2806 goto cmdpool_alloc_fail;
2808 /* pre-format cmds pool with ITT */
2809 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2810 struct iscsi_task *task = session->cmds[cmd_i];
2813 task->dd_data = &task[1];
2815 task->state = ISCSI_TASK_FREE;
2816 INIT_LIST_HEAD(&task->running);
2819 if (!try_module_get(iscsit->owner))
2820 goto module_get_fail;
2822 if (iscsi_add_session(cls_session, id))
2823 goto cls_session_fail;
2828 module_put(iscsit->owner);
2830 iscsi_pool_free(&session->cmdpool);
2832 iscsi_free_session(cls_session);
2834 iscsi_host_dec_session_cnt(shost);
2837 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2840 * iscsi_session_teardown - destroy session, host, and cls_session
2841 * @cls_session: iscsi session
2843 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2845 struct iscsi_session *session = cls_session->dd_data;
2846 struct module *owner = cls_session->transport->owner;
2847 struct Scsi_Host *shost = session->host;
2849 iscsi_pool_free(&session->cmdpool);
2851 iscsi_remove_session(cls_session);
2853 kfree(session->password);
2854 kfree(session->password_in);
2855 kfree(session->username);
2856 kfree(session->username_in);
2857 kfree(session->targetname);
2858 kfree(session->targetalias);
2859 kfree(session->initiatorname);
2860 kfree(session->boot_root);
2861 kfree(session->boot_nic);
2862 kfree(session->boot_target);
2863 kfree(session->ifacename);
2864 kfree(session->portal_type);
2865 kfree(session->discovery_parent_type);
2867 iscsi_free_session(cls_session);
2869 iscsi_host_dec_session_cnt(shost);
2872 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2875 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2876 * @cls_session: iscsi_cls_session
2877 * @dd_size: private driver data size
2880 struct iscsi_cls_conn *
2881 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2884 struct iscsi_session *session = cls_session->dd_data;
2885 struct iscsi_conn *conn;
2886 struct iscsi_cls_conn *cls_conn;
2889 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2893 conn = cls_conn->dd_data;
2894 memset(conn, 0, sizeof(*conn) + dd_size);
2896 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2897 conn->session = session;
2898 conn->cls_conn = cls_conn;
2899 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2900 conn->id = conn_idx;
2901 conn->exp_statsn = 0;
2902 conn->tmf_state = TMF_INITIAL;
2904 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
2906 INIT_LIST_HEAD(&conn->mgmtqueue);
2907 INIT_LIST_HEAD(&conn->cmdqueue);
2908 INIT_LIST_HEAD(&conn->requeue);
2909 spin_lock_init(&conn->taskqueuelock);
2910 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2912 /* allocate login_task used for the login/text sequences */
2913 spin_lock_bh(&session->frwd_lock);
2914 if (!kfifo_out(&session->cmdpool.queue,
2915 (void*)&conn->login_task,
2917 spin_unlock_bh(&session->frwd_lock);
2918 goto login_task_alloc_fail;
2920 spin_unlock_bh(&session->frwd_lock);
2922 data = (char *) __get_free_pages(GFP_KERNEL,
2923 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2925 goto login_task_data_alloc_fail;
2926 conn->login_task->data = conn->data = data;
2928 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
2929 init_waitqueue_head(&conn->ehwait);
2933 login_task_data_alloc_fail:
2934 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2936 login_task_alloc_fail:
2937 iscsi_destroy_conn(cls_conn);
2940 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2943 * iscsi_conn_teardown - teardown iscsi connection
2944 * @cls_conn: iscsi class connection
2946 * TODO: we may need to make this into a two step process
2947 * like scsi-mls remove + put host
2949 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2951 struct iscsi_conn *conn = cls_conn->dd_data;
2952 struct iscsi_session *session = conn->session;
2954 del_timer_sync(&conn->transport_timer);
2956 mutex_lock(&session->eh_mutex);
2957 spin_lock_bh(&session->frwd_lock);
2958 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2959 if (session->leadconn == conn) {
2961 * leading connection? then give up on recovery.
2963 session->state = ISCSI_STATE_TERMINATE;
2964 wake_up(&conn->ehwait);
2966 spin_unlock_bh(&session->frwd_lock);
2968 /* flush queued up work because we free the connection below */
2969 iscsi_suspend_tx(conn);
2971 spin_lock_bh(&session->frwd_lock);
2972 free_pages((unsigned long) conn->data,
2973 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2974 kfree(conn->persistent_address);
2975 kfree(conn->local_ipaddr);
2976 /* regular RX path uses back_lock */
2977 spin_lock_bh(&session->back_lock);
2978 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2980 spin_unlock_bh(&session->back_lock);
2981 if (session->leadconn == conn)
2982 session->leadconn = NULL;
2983 spin_unlock_bh(&session->frwd_lock);
2984 mutex_unlock(&session->eh_mutex);
2986 iscsi_destroy_conn(cls_conn);
2988 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2990 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2992 struct iscsi_conn *conn = cls_conn->dd_data;
2993 struct iscsi_session *session = conn->session;
2996 iscsi_conn_printk(KERN_ERR, conn,
2997 "can't start unbound connection\n");
3001 if ((session->imm_data_en || !session->initial_r2t_en) &&
3002 session->first_burst > session->max_burst) {
3003 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3004 "first_burst %d max_burst %d\n",
3005 session->first_burst, session->max_burst);
3009 if (conn->ping_timeout && !conn->recv_timeout) {
3010 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3011 "zero. Using 5 seconds\n.");
3012 conn->recv_timeout = 5;
3015 if (conn->recv_timeout && !conn->ping_timeout) {
3016 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3017 "zero. Using 5 seconds.\n");
3018 conn->ping_timeout = 5;
3021 spin_lock_bh(&session->frwd_lock);
3022 conn->c_stage = ISCSI_CONN_STARTED;
3023 session->state = ISCSI_STATE_LOGGED_IN;
3024 session->queued_cmdsn = session->cmdsn;
3026 conn->last_recv = jiffies;
3027 conn->last_ping = jiffies;
3028 if (conn->recv_timeout && conn->ping_timeout)
3029 mod_timer(&conn->transport_timer,
3030 jiffies + (conn->recv_timeout * HZ));
3032 switch(conn->stop_stage) {
3033 case STOP_CONN_RECOVER:
3035 * unblock eh_abort() if it is blocked. re-try all
3036 * commands after successful recovery
3038 conn->stop_stage = 0;
3039 conn->tmf_state = TMF_INITIAL;
3041 if (session->age == 16)
3044 case STOP_CONN_TERM:
3045 conn->stop_stage = 0;
3050 spin_unlock_bh(&session->frwd_lock);
3052 iscsi_unblock_session(session->cls_session);
3053 wake_up(&conn->ehwait);
3056 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3059 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3061 struct iscsi_task *task;
3064 for (i = 0; i < conn->session->cmds_max; i++) {
3065 task = conn->session->cmds[i];
3069 if (task->state == ISCSI_TASK_FREE)
3072 ISCSI_DBG_SESSION(conn->session,
3073 "failing mgmt itt 0x%x state %d\n",
3074 task->itt, task->state);
3075 state = ISCSI_TASK_ABRT_SESS_RECOV;
3076 if (task->state == ISCSI_TASK_PENDING)
3077 state = ISCSI_TASK_COMPLETED;
3078 iscsi_complete_task(task, state);
3083 static void iscsi_start_session_recovery(struct iscsi_session *session,
3084 struct iscsi_conn *conn, int flag)
3088 mutex_lock(&session->eh_mutex);
3089 spin_lock_bh(&session->frwd_lock);
3090 if (conn->stop_stage == STOP_CONN_TERM) {
3091 spin_unlock_bh(&session->frwd_lock);
3092 mutex_unlock(&session->eh_mutex);
3097 * When this is called for the in_login state, we only want to clean
3098 * up the login task and connection. We do not need to block and set
3099 * the recovery state again
3101 if (flag == STOP_CONN_TERM)
3102 session->state = ISCSI_STATE_TERMINATE;
3103 else if (conn->stop_stage != STOP_CONN_RECOVER)
3104 session->state = ISCSI_STATE_IN_RECOVERY;
3106 old_stop_stage = conn->stop_stage;
3107 conn->stop_stage = flag;
3108 spin_unlock_bh(&session->frwd_lock);
3110 del_timer_sync(&conn->transport_timer);
3111 iscsi_suspend_tx(conn);
3113 spin_lock_bh(&session->frwd_lock);
3114 conn->c_stage = ISCSI_CONN_STOPPED;
3115 spin_unlock_bh(&session->frwd_lock);
3118 * for connection level recovery we should not calculate
3119 * header digest. conn->hdr_size used for optimization
3120 * in hdr_extract() and will be re-negotiated at
3123 if (flag == STOP_CONN_RECOVER) {
3124 conn->hdrdgst_en = 0;
3125 conn->datadgst_en = 0;
3126 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3127 old_stop_stage != STOP_CONN_RECOVER) {
3128 ISCSI_DBG_SESSION(session, "blocking session\n");
3129 iscsi_block_session(session->cls_session);
3136 spin_lock_bh(&session->frwd_lock);
3137 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3138 fail_mgmt_tasks(session, conn);
3139 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3140 spin_unlock_bh(&session->frwd_lock);
3141 mutex_unlock(&session->eh_mutex);
3144 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3146 struct iscsi_conn *conn = cls_conn->dd_data;
3147 struct iscsi_session *session = conn->session;
3150 case STOP_CONN_RECOVER:
3151 case STOP_CONN_TERM:
3152 iscsi_start_session_recovery(session, conn, flag);
3155 iscsi_conn_printk(KERN_ERR, conn,
3156 "invalid stop flag %d\n", flag);
3159 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3161 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3162 struct iscsi_cls_conn *cls_conn, int is_leading)
3164 struct iscsi_session *session = cls_session->dd_data;
3165 struct iscsi_conn *conn = cls_conn->dd_data;
3167 spin_lock_bh(&session->frwd_lock);
3169 session->leadconn = conn;
3170 spin_unlock_bh(&session->frwd_lock);
3173 * Unblock xmitworker(), Login Phase will pass through.
3175 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3176 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3179 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3181 int iscsi_switch_str_param(char **param, char *new_val_buf)
3186 if (!strcmp(*param, new_val_buf))
3190 new_val = kstrdup(new_val_buf, GFP_NOIO);
3198 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3200 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3201 enum iscsi_param param, char *buf, int buflen)
3203 struct iscsi_conn *conn = cls_conn->dd_data;
3204 struct iscsi_session *session = conn->session;
3208 case ISCSI_PARAM_FAST_ABORT:
3209 sscanf(buf, "%d", &session->fast_abort);
3211 case ISCSI_PARAM_ABORT_TMO:
3212 sscanf(buf, "%d", &session->abort_timeout);
3214 case ISCSI_PARAM_LU_RESET_TMO:
3215 sscanf(buf, "%d", &session->lu_reset_timeout);
3217 case ISCSI_PARAM_TGT_RESET_TMO:
3218 sscanf(buf, "%d", &session->tgt_reset_timeout);
3220 case ISCSI_PARAM_PING_TMO:
3221 sscanf(buf, "%d", &conn->ping_timeout);
3223 case ISCSI_PARAM_RECV_TMO:
3224 sscanf(buf, "%d", &conn->recv_timeout);
3226 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3227 sscanf(buf, "%d", &conn->max_recv_dlength);
3229 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3230 sscanf(buf, "%d", &conn->max_xmit_dlength);
3232 case ISCSI_PARAM_HDRDGST_EN:
3233 sscanf(buf, "%d", &conn->hdrdgst_en);
3235 case ISCSI_PARAM_DATADGST_EN:
3236 sscanf(buf, "%d", &conn->datadgst_en);
3238 case ISCSI_PARAM_INITIAL_R2T_EN:
3239 sscanf(buf, "%d", &session->initial_r2t_en);
3241 case ISCSI_PARAM_MAX_R2T:
3242 sscanf(buf, "%hu", &session->max_r2t);
3244 case ISCSI_PARAM_IMM_DATA_EN:
3245 sscanf(buf, "%d", &session->imm_data_en);
3247 case ISCSI_PARAM_FIRST_BURST:
3248 sscanf(buf, "%d", &session->first_burst);
3250 case ISCSI_PARAM_MAX_BURST:
3251 sscanf(buf, "%d", &session->max_burst);
3253 case ISCSI_PARAM_PDU_INORDER_EN:
3254 sscanf(buf, "%d", &session->pdu_inorder_en);
3256 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3257 sscanf(buf, "%d", &session->dataseq_inorder_en);
3259 case ISCSI_PARAM_ERL:
3260 sscanf(buf, "%d", &session->erl);
3262 case ISCSI_PARAM_EXP_STATSN:
3263 sscanf(buf, "%u", &conn->exp_statsn);
3265 case ISCSI_PARAM_USERNAME:
3266 return iscsi_switch_str_param(&session->username, buf);
3267 case ISCSI_PARAM_USERNAME_IN:
3268 return iscsi_switch_str_param(&session->username_in, buf);
3269 case ISCSI_PARAM_PASSWORD:
3270 return iscsi_switch_str_param(&session->password, buf);
3271 case ISCSI_PARAM_PASSWORD_IN:
3272 return iscsi_switch_str_param(&session->password_in, buf);
3273 case ISCSI_PARAM_TARGET_NAME:
3274 return iscsi_switch_str_param(&session->targetname, buf);
3275 case ISCSI_PARAM_TARGET_ALIAS:
3276 return iscsi_switch_str_param(&session->targetalias, buf);
3277 case ISCSI_PARAM_TPGT:
3278 sscanf(buf, "%d", &session->tpgt);
3280 case ISCSI_PARAM_PERSISTENT_PORT:
3281 sscanf(buf, "%d", &conn->persistent_port);
3283 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3284 return iscsi_switch_str_param(&conn->persistent_address, buf);
3285 case ISCSI_PARAM_IFACE_NAME:
3286 return iscsi_switch_str_param(&session->ifacename, buf);
3287 case ISCSI_PARAM_INITIATOR_NAME:
3288 return iscsi_switch_str_param(&session->initiatorname, buf);
3289 case ISCSI_PARAM_BOOT_ROOT:
3290 return iscsi_switch_str_param(&session->boot_root, buf);
3291 case ISCSI_PARAM_BOOT_NIC:
3292 return iscsi_switch_str_param(&session->boot_nic, buf);
3293 case ISCSI_PARAM_BOOT_TARGET:
3294 return iscsi_switch_str_param(&session->boot_target, buf);
3295 case ISCSI_PARAM_PORTAL_TYPE:
3296 return iscsi_switch_str_param(&session->portal_type, buf);
3297 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3298 return iscsi_switch_str_param(&session->discovery_parent_type,
3300 case ISCSI_PARAM_DISCOVERY_SESS:
3301 sscanf(buf, "%d", &val);
3302 session->discovery_sess = !!val;
3304 case ISCSI_PARAM_LOCAL_IPADDR:
3305 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3312 EXPORT_SYMBOL_GPL(iscsi_set_param);
3314 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3315 enum iscsi_param param, char *buf)
3317 struct iscsi_session *session = cls_session->dd_data;
3321 case ISCSI_PARAM_FAST_ABORT:
3322 len = sprintf(buf, "%d\n", session->fast_abort);
3324 case ISCSI_PARAM_ABORT_TMO:
3325 len = sprintf(buf, "%d\n", session->abort_timeout);
3327 case ISCSI_PARAM_LU_RESET_TMO:
3328 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3330 case ISCSI_PARAM_TGT_RESET_TMO:
3331 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3333 case ISCSI_PARAM_INITIAL_R2T_EN:
3334 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3336 case ISCSI_PARAM_MAX_R2T:
3337 len = sprintf(buf, "%hu\n", session->max_r2t);
3339 case ISCSI_PARAM_IMM_DATA_EN:
3340 len = sprintf(buf, "%d\n", session->imm_data_en);
3342 case ISCSI_PARAM_FIRST_BURST:
3343 len = sprintf(buf, "%u\n", session->first_burst);
3345 case ISCSI_PARAM_MAX_BURST:
3346 len = sprintf(buf, "%u\n", session->max_burst);
3348 case ISCSI_PARAM_PDU_INORDER_EN:
3349 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3351 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3352 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3354 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3355 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3357 case ISCSI_PARAM_ERL:
3358 len = sprintf(buf, "%d\n", session->erl);
3360 case ISCSI_PARAM_TARGET_NAME:
3361 len = sprintf(buf, "%s\n", session->targetname);
3363 case ISCSI_PARAM_TARGET_ALIAS:
3364 len = sprintf(buf, "%s\n", session->targetalias);
3366 case ISCSI_PARAM_TPGT:
3367 len = sprintf(buf, "%d\n", session->tpgt);
3369 case ISCSI_PARAM_USERNAME:
3370 len = sprintf(buf, "%s\n", session->username);
3372 case ISCSI_PARAM_USERNAME_IN:
3373 len = sprintf(buf, "%s\n", session->username_in);
3375 case ISCSI_PARAM_PASSWORD:
3376 len = sprintf(buf, "%s\n", session->password);
3378 case ISCSI_PARAM_PASSWORD_IN:
3379 len = sprintf(buf, "%s\n", session->password_in);
3381 case ISCSI_PARAM_IFACE_NAME:
3382 len = sprintf(buf, "%s\n", session->ifacename);
3384 case ISCSI_PARAM_INITIATOR_NAME:
3385 len = sprintf(buf, "%s\n", session->initiatorname);
3387 case ISCSI_PARAM_BOOT_ROOT:
3388 len = sprintf(buf, "%s\n", session->boot_root);
3390 case ISCSI_PARAM_BOOT_NIC:
3391 len = sprintf(buf, "%s\n", session->boot_nic);
3393 case ISCSI_PARAM_BOOT_TARGET:
3394 len = sprintf(buf, "%s\n", session->boot_target);
3396 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3397 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3399 case ISCSI_PARAM_DISCOVERY_SESS:
3400 len = sprintf(buf, "%u\n", session->discovery_sess);
3402 case ISCSI_PARAM_PORTAL_TYPE:
3403 len = sprintf(buf, "%s\n", session->portal_type);
3405 case ISCSI_PARAM_CHAP_AUTH_EN:
3406 len = sprintf(buf, "%u\n", session->chap_auth_en);
3408 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3409 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3411 case ISCSI_PARAM_BIDI_CHAP_EN:
3412 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3414 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3415 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3417 case ISCSI_PARAM_DEF_TIME2WAIT:
3418 len = sprintf(buf, "%d\n", session->time2wait);
3420 case ISCSI_PARAM_DEF_TIME2RETAIN:
3421 len = sprintf(buf, "%d\n", session->time2retain);
3423 case ISCSI_PARAM_TSID:
3424 len = sprintf(buf, "%u\n", session->tsid);
3426 case ISCSI_PARAM_ISID:
3427 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3428 session->isid[0], session->isid[1],
3429 session->isid[2], session->isid[3],
3430 session->isid[4], session->isid[5]);
3432 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3433 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3435 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3436 if (session->discovery_parent_type)
3437 len = sprintf(buf, "%s\n",
3438 session->discovery_parent_type);
3440 len = sprintf(buf, "\n");
3448 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3450 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3451 enum iscsi_param param, char *buf)
3453 struct sockaddr_in6 *sin6 = NULL;
3454 struct sockaddr_in *sin = NULL;
3457 switch (addr->ss_family) {
3459 sin = (struct sockaddr_in *)addr;
3462 sin6 = (struct sockaddr_in6 *)addr;
3469 case ISCSI_PARAM_CONN_ADDRESS:
3470 case ISCSI_HOST_PARAM_IPADDRESS:
3472 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3474 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3476 case ISCSI_PARAM_CONN_PORT:
3477 case ISCSI_PARAM_LOCAL_PORT:
3479 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3481 len = sprintf(buf, "%hu\n",
3482 be16_to_cpu(sin6->sin6_port));
3490 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3492 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3493 enum iscsi_param param, char *buf)
3495 struct iscsi_conn *conn = cls_conn->dd_data;
3499 case ISCSI_PARAM_PING_TMO:
3500 len = sprintf(buf, "%u\n", conn->ping_timeout);
3502 case ISCSI_PARAM_RECV_TMO:
3503 len = sprintf(buf, "%u\n", conn->recv_timeout);
3505 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3506 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3508 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3509 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3511 case ISCSI_PARAM_HDRDGST_EN:
3512 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3514 case ISCSI_PARAM_DATADGST_EN:
3515 len = sprintf(buf, "%d\n", conn->datadgst_en);
3517 case ISCSI_PARAM_IFMARKER_EN:
3518 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3520 case ISCSI_PARAM_OFMARKER_EN:
3521 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3523 case ISCSI_PARAM_EXP_STATSN:
3524 len = sprintf(buf, "%u\n", conn->exp_statsn);
3526 case ISCSI_PARAM_PERSISTENT_PORT:
3527 len = sprintf(buf, "%d\n", conn->persistent_port);
3529 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3530 len = sprintf(buf, "%s\n", conn->persistent_address);
3532 case ISCSI_PARAM_STATSN:
3533 len = sprintf(buf, "%u\n", conn->statsn);
3535 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3536 len = sprintf(buf, "%u\n", conn->max_segment_size);
3538 case ISCSI_PARAM_KEEPALIVE_TMO:
3539 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3541 case ISCSI_PARAM_LOCAL_PORT:
3542 len = sprintf(buf, "%u\n", conn->local_port);
3544 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3545 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3547 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3548 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3550 case ISCSI_PARAM_TCP_WSF_DISABLE:
3551 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3553 case ISCSI_PARAM_TCP_TIMER_SCALE:
3554 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3556 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3557 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3559 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3560 len = sprintf(buf, "%u\n", conn->fragment_disable);
3562 case ISCSI_PARAM_IPV4_TOS:
3563 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3565 case ISCSI_PARAM_IPV6_TC:
3566 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3568 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3569 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3571 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3572 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3574 case ISCSI_PARAM_TCP_XMIT_WSF:
3575 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3577 case ISCSI_PARAM_TCP_RECV_WSF:
3578 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3580 case ISCSI_PARAM_LOCAL_IPADDR:
3581 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3589 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3591 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3594 struct iscsi_host *ihost = shost_priv(shost);
3598 case ISCSI_HOST_PARAM_NETDEV_NAME:
3599 len = sprintf(buf, "%s\n", ihost->netdev);
3601 case ISCSI_HOST_PARAM_HWADDRESS:
3602 len = sprintf(buf, "%s\n", ihost->hwaddress);
3604 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3605 len = sprintf(buf, "%s\n", ihost->initiatorname);
3613 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3615 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3616 char *buf, int buflen)
3618 struct iscsi_host *ihost = shost_priv(shost);
3621 case ISCSI_HOST_PARAM_NETDEV_NAME:
3622 return iscsi_switch_str_param(&ihost->netdev, buf);
3623 case ISCSI_HOST_PARAM_HWADDRESS:
3624 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3625 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3626 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3633 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3635 MODULE_AUTHOR("Mike Christie");
3636 MODULE_DESCRIPTION("iSCSI library functions");
3637 MODULE_LICENSE("GPL");