4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <linux/slab.h>
29 #include <linux/module.h>
30 #include <asm/unaligned.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi_host.h>
37 #include <scsi/scsi.h>
38 #include <scsi/iscsi_proto.h>
39 #include <scsi/scsi_transport.h>
40 #include <scsi/scsi_transport_iscsi.h>
41 #include <scsi/libiscsi.h>
43 static int iscsi_dbg_lib_conn;
44 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
46 MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
50 static int iscsi_dbg_lib_session;
51 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
53 MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
57 static int iscsi_dbg_lib_eh;
58 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
60 MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
64 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
66 if (iscsi_dbg_lib_conn) \
67 iscsi_conn_printk(KERN_INFO, _conn, \
72 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
74 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
80 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
82 if (iscsi_dbg_lib_eh) \
83 iscsi_session_printk(KERN_INFO, _session, \
88 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
94 queue_work(ihost->workq, &conn->xmitwork);
96 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
98 static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
110 session->exp_cmdsn = exp_cmdsn;
112 if (max_cmdsn != session->max_cmdsn &&
113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
114 session->max_cmdsn = max_cmdsn;
117 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
120 be32_to_cpu(hdr->max_cmdsn));
122 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
128 * @hdr: iscsi data in pdu
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
134 * This function is called with connection lock taken.
136 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
137 struct iscsi_data *hdr)
139 struct iscsi_conn *conn = task->conn;
140 unsigned int left = r2t->data_length - r2t->sent;
142 task->hdr_len = sizeof(struct iscsi_data);
144 memset(hdr, 0, sizeof(struct iscsi_data));
146 hdr->datasn = cpu_to_be32(r2t->datasn);
148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
149 hdr->lun = task->lun;
150 hdr->itt = task->hdr_itt;
151 hdr->exp_statsn = r2t->exp_statsn;
152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
153 if (left > conn->max_xmit_dlength) {
154 hton24(hdr->dlength, conn->max_xmit_dlength);
155 r2t->data_count = conn->max_xmit_dlength;
158 hton24(hdr->dlength, left);
159 r2t->data_count = left;
160 hdr->flags = ISCSI_FLAG_CMD_FINAL;
162 conn->dataout_pdus_cnt++;
164 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
166 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
168 unsigned exp_len = task->hdr_len + len;
170 if (exp_len > task->hdr_max) {
175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
176 task->hdr_len = exp_len;
181 * make an extended cdb AHS
183 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
185 struct scsi_cmnd *cmd = task->sc;
186 unsigned rlen, pad_len;
187 unsigned short ahslength;
188 struct iscsi_ecdb_ahdr *ecdb_ahdr;
191 ecdb_ahdr = iscsi_next_hdr(task);
192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
195 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
197 pad_len = iscsi_padding(rlen);
199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
209 ecdb_ahdr->reserved = 0;
210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
212 ISCSI_DBG_SESSION(task->conn->session,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
220 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
222 struct scsi_cmnd *sc = task->sc;
223 struct iscsi_rlength_ahdr *rlen_ahdr;
226 rlen_ahdr = iscsi_next_hdr(task);
227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
231 rlen_ahdr->ahslength =
232 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
233 sizeof(rlen_ahdr->reserved));
234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
235 rlen_ahdr->reserved = 0;
236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
238 ISCSI_DBG_SESSION(task->conn->session,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr->read_length),
242 be16_to_cpu(rlen_ahdr->ahslength));
247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
249 * @opcode: opcode to check for
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
259 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
261 struct iscsi_conn *conn = task->conn;
262 struct iscsi_tm *tmf = &conn->tmhdr;
265 if (conn->tmf_state == TMF_INITIAL)
268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
271 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
274 * Allow PDUs for unrelated LUNs
276 hdr_lun = scsilun_to_int(&tmf->lun);
277 if (hdr_lun != task->sc->device->lun)
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
282 * Fail all SCSI cmd PDUs
284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
285 iscsi_conn_printk(KERN_INFO, conn,
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
297 if (conn->session->fast_abort) {
298 iscsi_conn_printk(KERN_INFO, conn,
300 "0x%x/0x%x] fast abort.\n",
306 case ISCSI_TM_FUNC_ABORT_TASK:
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
313 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
314 task->hdr_itt == tmf->rtt) {
315 ISCSI_DBG_SESSION(conn->session,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task->itt,
329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
335 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
337 struct iscsi_conn *conn = task->conn;
338 struct iscsi_session *session = conn->session;
339 struct scsi_cmnd *sc = task->sc;
340 struct iscsi_scsi_req *hdr;
341 unsigned hdrlength, cmd_len, transfer_length;
345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
349 if (conn->session->tt->alloc_pdu) {
350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
354 hdr = (struct iscsi_scsi_req *)task->hdr;
356 memset(hdr, 0, sizeof(*hdr));
358 if (session->tt->parse_pdu_itt)
359 hdr->itt = task->hdr_itt = itt;
361 hdr->itt = task->hdr_itt = build_itt(task->itt,
362 task->conn->session->age);
364 rc = iscsi_add_hdr(task, sizeof(*hdr));
367 hdr->opcode = ISCSI_OP_SCSI_CMD;
368 hdr->flags = ISCSI_ATTR_SIMPLE;
369 int_to_scsilun(sc->device->lun, &hdr->lun);
370 task->lun = hdr->lun;
371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
372 cmd_len = sc->cmd_len;
373 if (cmd_len < ISCSI_CDB_SIZE)
374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
375 else if (cmd_len > ISCSI_CDB_SIZE) {
376 rc = iscsi_prep_ecdb_ahs(task);
379 cmd_len = ISCSI_CDB_SIZE;
381 memcpy(hdr->cdb, sc->cmnd, cmd_len);
384 if (scsi_bidi_cmnd(sc)) {
385 hdr->flags |= ISCSI_FLAG_CMD_READ;
386 rc = iscsi_prep_bidi_ahs(task);
391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
392 task->protected = true;
394 transfer_length = scsi_transfer_length(sc);
395 hdr->data_length = cpu_to_be32(transfer_length);
396 if (sc->sc_data_direction == DMA_TO_DEVICE) {
397 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
399 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
403 * imm_count bytes to be sent right after
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
410 * r2t data_length bytes to be sent via R2T ack's
412 * pad_count bytes to be sent as zero-padding
414 memset(r2t, 0, sizeof(*r2t));
416 if (session->imm_data_en) {
417 if (transfer_length >= session->first_burst)
418 task->imm_count = min(session->first_burst,
419 conn->max_xmit_dlength);
421 task->imm_count = min(transfer_length,
422 conn->max_xmit_dlength);
423 hton24(hdr->dlength, task->imm_count);
425 zero_data(hdr->dlength);
427 if (!session->initial_r2t_en) {
428 r2t->data_length = min(session->first_burst,
431 r2t->data_offset = task->imm_count;
432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
436 if (!task->unsol_r2t.data_length)
437 /* No unsolicit Data-Out's */
438 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 zero_data(hdr->dlength);
443 if (sc->sc_data_direction == DMA_FROM_DEVICE)
444 hdr->flags |= ISCSI_FLAG_CMD_READ;
447 /* calculate size of additional header segments (AHSs) */
448 hdrlength = task->hdr_len - sizeof(*hdr);
450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
451 hdrlength /= ISCSI_PAD_LEN;
453 WARN_ON(hdrlength >= 256);
454 hdr->hlength = hdrlength & 0xFF;
455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
457 if (session->tt->init_task && session->tt->init_task(task))
460 task->state = ISCSI_TASK_RUNNING;
463 conn->scsicmd_pdus_cnt++;
464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc) ? "bidirectional" :
467 sc->sc_data_direction == DMA_TO_DEVICE ?
468 "write" : "read", conn->id, sc, sc->cmnd[0],
469 task->itt, transfer_length,
470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
472 session->max_cmdsn - session->exp_cmdsn + 1);
477 * iscsi_free_task - free a task
478 * @task: iscsi cmd task
480 * Must be called with session back_lock.
481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
484 static void iscsi_free_task(struct iscsi_task *task)
486 struct iscsi_conn *conn = task->conn;
487 struct iscsi_session *session = conn->session;
488 struct scsi_cmnd *sc = task->sc;
489 int oldstate = task->state;
491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
492 task->itt, task->state, task->sc);
494 session->tt->cleanup_task(task);
495 task->state = ISCSI_TASK_FREE;
498 * login task is preallocated so do not free
500 if (conn->login_task == task)
503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
506 /* SCSI eh reuses commands to verify us */
509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
517 void __iscsi_get_task(struct iscsi_task *task)
519 atomic_inc(&task->refcount);
521 EXPORT_SYMBOL_GPL(__iscsi_get_task);
523 void __iscsi_put_task(struct iscsi_task *task)
525 if (atomic_dec_and_test(&task->refcount))
526 iscsi_free_task(task);
528 EXPORT_SYMBOL_GPL(__iscsi_put_task);
530 void iscsi_put_task(struct iscsi_task *task)
532 struct iscsi_session *session = task->conn->session;
534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session->back_lock);
536 __iscsi_put_task(task);
537 spin_unlock_bh(&session->back_lock);
539 EXPORT_SYMBOL_GPL(iscsi_put_task);
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
544 * @state: state to complete task with
546 * Must be called with session back_lock.
548 static void iscsi_complete_task(struct iscsi_task *task, int state)
550 struct iscsi_conn *conn = task->conn;
552 ISCSI_DBG_SESSION(conn->session,
553 "complete task itt 0x%x state %d sc %p\n",
554 task->itt, task->state, task->sc);
555 if (task->state == ISCSI_TASK_COMPLETED ||
556 task->state == ISCSI_TASK_ABRT_TMF ||
557 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
558 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
563 spin_lock_bh(&conn->taskqueuelock);
564 if (!list_empty(&task->running)) {
565 pr_debug_once("%s while task on list", __func__);
566 list_del_init(&task->running);
568 spin_unlock_bh(&conn->taskqueuelock);
570 if (conn->task == task)
573 if (READ_ONCE(conn->ping_task) == task)
574 WRITE_ONCE(conn->ping_task, NULL);
576 /* release get from queueing */
577 __iscsi_put_task(task);
581 * iscsi_complete_scsi_task - finish scsi task normally
582 * @task: iscsi task for scsi cmd
583 * @exp_cmdsn: expected cmd sn in cpu format
584 * @max_cmdsn: max cmd sn in cpu format
586 * This is used when drivers do not need or cannot perform
587 * lower level pdu processing.
589 * Called with session back_lock
591 void iscsi_complete_scsi_task(struct iscsi_task *task,
592 uint32_t exp_cmdsn, uint32_t max_cmdsn)
594 struct iscsi_conn *conn = task->conn;
596 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
598 conn->last_recv = jiffies;
599 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
600 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
602 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
606 * session back_lock must be held and if not called for a task that is
607 * still pending or from the xmit thread, then xmit thread must
610 static void fail_scsi_task(struct iscsi_task *task, int err)
612 struct iscsi_conn *conn = task->conn;
613 struct scsi_cmnd *sc;
617 * if a command completes and we get a successful tmf response
618 * we will hit this because the scsi eh abort code does not take
625 if (task->state == ISCSI_TASK_PENDING) {
627 * cmd never made it to the xmit thread, so we should not count
628 * the cmd in the sequencing
630 conn->session->queued_cmdsn--;
631 /* it was never sent so just complete like normal */
632 state = ISCSI_TASK_COMPLETED;
633 } else if (err == DID_TRANSPORT_DISRUPTED)
634 state = ISCSI_TASK_ABRT_SESS_RECOV;
636 state = ISCSI_TASK_ABRT_TMF;
638 sc->result = err << 16;
639 if (!scsi_bidi_cmnd(sc))
640 scsi_set_resid(sc, scsi_bufflen(sc));
642 scsi_out(sc)->resid = scsi_out(sc)->length;
643 scsi_in(sc)->resid = scsi_in(sc)->length;
646 /* regular RX path uses back_lock */
647 spin_lock_bh(&conn->session->back_lock);
648 iscsi_complete_task(task, state);
649 spin_unlock_bh(&conn->session->back_lock);
652 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
653 struct iscsi_task *task)
655 struct iscsi_session *session = conn->session;
656 struct iscsi_hdr *hdr = task->hdr;
657 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
658 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
660 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
663 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
664 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
666 * pre-format CmdSN for outgoing PDU.
668 nop->cmdsn = cpu_to_be32(session->cmdsn);
669 if (hdr->itt != RESERVED_ITT) {
671 * TODO: We always use immediate for normal session pdus.
672 * If we start to send tmfs or nops as non-immediate then
673 * we should start checking the cmdsn numbers for mgmt tasks.
675 * During discovery sessions iscsid sends TEXT as non immediate,
676 * but we always only send one PDU at a time.
678 if (conn->c_stage == ISCSI_CONN_STARTED &&
679 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
680 session->queued_cmdsn++;
685 if (session->tt->init_task && session->tt->init_task(task))
688 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
689 session->state = ISCSI_STATE_LOGGING_OUT;
691 task->state = ISCSI_TASK_RUNNING;
692 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
693 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
694 hdr->itt, task->data_count);
698 static struct iscsi_task *
699 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
700 char *data, uint32_t data_size)
702 struct iscsi_session *session = conn->session;
703 struct iscsi_host *ihost = shost_priv(session->host);
704 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
705 struct iscsi_task *task;
708 if (session->state == ISCSI_STATE_TERMINATE)
711 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
713 * Login and Text are sent serially, in
714 * request-followed-by-response sequence.
715 * Same task can be used. Same ITT must be used.
716 * Note that login_task is preallocated at conn_create().
718 if (conn->login_task->state != ISCSI_TASK_FREE) {
719 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
720 "progress. Cannot start new task.\n");
724 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
725 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);
729 task = conn->login_task;
731 if (session->state != ISCSI_STATE_LOGGED_IN)
734 if (data_size != 0) {
735 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
739 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
740 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
742 if (!kfifo_out(&session->cmdpool.queue,
743 (void*)&task, sizeof(void*)))
747 * released in complete pdu for task we expect a response for, and
748 * released by the lld when it has transmitted the task for
749 * pdus we do not expect a response for.
751 atomic_set(&task->refcount, 1);
754 INIT_LIST_HEAD(&task->running);
755 task->state = ISCSI_TASK_PENDING;
758 memcpy(task->data, data, data_size);
759 task->data_count = data_size;
761 task->data_count = 0;
763 if (conn->session->tt->alloc_pdu) {
764 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
765 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
766 "pdu for mgmt task.\n");
771 itt = task->hdr->itt;
772 task->hdr_len = sizeof(struct iscsi_hdr);
773 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
775 if (hdr->itt != RESERVED_ITT) {
776 if (session->tt->parse_pdu_itt)
777 task->hdr->itt = itt;
779 task->hdr->itt = build_itt(task->itt,
780 task->conn->session->age);
783 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK))
784 WRITE_ONCE(conn->ping_task, task);
787 if (iscsi_prep_mgmt_task(conn, task))
790 if (session->tt->xmit_task(task))
793 spin_lock_bh(&conn->taskqueuelock);
794 list_add_tail(&task->running, &conn->mgmtqueue);
795 spin_unlock_bh(&conn->taskqueuelock);
796 iscsi_conn_queue_work(conn);
802 /* regular RX path uses back_lock */
803 spin_lock(&session->back_lock);
804 __iscsi_put_task(task);
805 spin_unlock(&session->back_lock);
809 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
810 char *data, uint32_t data_size)
812 struct iscsi_conn *conn = cls_conn->dd_data;
813 struct iscsi_session *session = conn->session;
816 spin_lock_bh(&session->frwd_lock);
817 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
819 spin_unlock_bh(&session->frwd_lock);
822 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
825 * iscsi_cmd_rsp - SCSI Command Response processing
826 * @conn: iscsi connection
828 * @task: scsi command task
829 * @data: cmd data buffer
830 * @datalen: len of buffer
832 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
833 * then completes the command and task.
835 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
836 struct iscsi_task *task, char *data,
839 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
840 struct iscsi_session *session = conn->session;
841 struct scsi_cmnd *sc = task->sc;
843 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
844 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
846 sc->result = (DID_OK << 16) | rhdr->cmd_status;
848 if (task->protected) {
853 * Transports that didn't implement check_protection
854 * callback but still published T10-PI support to scsi-mid
855 * deserve this BUG_ON.
857 BUG_ON(!session->tt->check_protection);
859 ascq = session->tt->check_protection(task, §or);
861 sc->result = DRIVER_SENSE << 24 |
862 SAM_STAT_CHECK_CONDITION;
863 scsi_build_sense_buffer(1, sc->sense_buffer,
864 ILLEGAL_REQUEST, 0x10, ascq);
865 scsi_set_sense_information(sc->sense_buffer,
866 SCSI_SENSE_BUFFERSIZE,
872 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
873 sc->result = DID_ERROR << 16;
877 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
882 iscsi_conn_printk(KERN_ERR, conn,
883 "Got CHECK_CONDITION but invalid data "
884 "buffer size of %d\n", datalen);
885 sc->result = DID_BAD_TARGET << 16;
889 senselen = get_unaligned_be16(data);
890 if (datalen < senselen)
891 goto invalid_datalen;
893 memcpy(sc->sense_buffer, data + 2,
894 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
895 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
896 min_t(uint16_t, senselen,
897 SCSI_SENSE_BUFFERSIZE));
900 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
901 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
902 int res_count = be32_to_cpu(rhdr->bi_residual_count);
904 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
905 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
906 res_count <= scsi_in(sc)->length))
907 scsi_in(sc)->resid = res_count;
909 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
912 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
913 ISCSI_FLAG_CMD_OVERFLOW)) {
914 int res_count = be32_to_cpu(rhdr->residual_count);
917 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
918 res_count <= scsi_bufflen(sc)))
919 /* write side for bidi or uni-io set_resid */
920 scsi_set_resid(sc, res_count);
922 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
925 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
926 sc, sc->result, task->itt);
927 conn->scsirsp_pdus_cnt++;
928 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
932 * iscsi_data_in_rsp - SCSI Data-In Response processing
933 * @conn: iscsi connection
935 * @task: scsi command task
938 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
939 struct iscsi_task *task)
941 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
942 struct scsi_cmnd *sc = task->sc;
944 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
947 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
948 sc->result = (DID_OK << 16) | rhdr->cmd_status;
949 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
950 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
951 ISCSI_FLAG_DATA_OVERFLOW)) {
952 int res_count = be32_to_cpu(rhdr->residual_count);
955 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
956 res_count <= scsi_in(sc)->length))
957 scsi_in(sc)->resid = res_count;
959 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
962 ISCSI_DBG_SESSION(conn->session, "data in with status done "
963 "[sc %p res %d itt 0x%x]\n",
964 sc, sc->result, task->itt);
965 conn->scsirsp_pdus_cnt++;
966 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
969 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
971 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
973 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
974 conn->tmfrsp_pdus_cnt++;
976 if (conn->tmf_state != TMF_QUEUED)
979 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
980 conn->tmf_state = TMF_SUCCESS;
981 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
982 conn->tmf_state = TMF_NOT_FOUND;
984 conn->tmf_state = TMF_FAILED;
985 wake_up(&conn->ehwait);
988 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
990 struct iscsi_nopout hdr;
991 struct iscsi_task *task;
994 if (READ_ONCE(conn->ping_task))
996 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK);
999 memset(&hdr, 0, sizeof(struct iscsi_nopout));
1000 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
1001 hdr.flags = ISCSI_FLAG_CMD_FINAL;
1004 hdr.lun = rhdr->lun;
1005 hdr.ttt = rhdr->ttt;
1006 hdr.itt = RESERVED_ITT;
1008 hdr.ttt = RESERVED_ITT;
1010 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
1013 WRITE_ONCE(conn->ping_task, NULL);
1014 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1017 /* only track our nops */
1018 conn->last_ping = jiffies;
1024 static int iscsi_nop_out_rsp(struct iscsi_task *task,
1025 struct iscsi_nopin *nop, char *data, int datalen)
1027 struct iscsi_conn *conn = task->conn;
1030 if (READ_ONCE(conn->ping_task) != task) {
1032 * If this is not in response to one of our
1033 * nops then it must be from userspace.
1035 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1037 rc = ISCSI_ERR_CONN_FAILED;
1039 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1040 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1044 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1045 char *data, int datalen)
1047 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1048 struct iscsi_hdr rejected_pdu;
1051 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1053 if (ntoh24(reject->dlength) > datalen ||
1054 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1055 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1056 "pdu. Invalid data length (pdu dlength "
1057 "%u, datalen %d\n", ntoh24(reject->dlength),
1059 return ISCSI_ERR_PROTO;
1061 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1062 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1064 switch (reject->reason) {
1065 case ISCSI_REASON_DATA_DIGEST_ERROR:
1066 iscsi_conn_printk(KERN_ERR, conn,
1067 "pdu (op 0x%x itt 0x%x) rejected "
1068 "due to DataDigest error.\n",
1069 opcode, rejected_pdu.itt);
1071 case ISCSI_REASON_IMM_CMD_REJECT:
1072 iscsi_conn_printk(KERN_ERR, conn,
1073 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1074 "immediate commands.\n",
1075 opcode, rejected_pdu.itt);
1077 * We only send one TMF at a time so if the target could not
1078 * handle it, then it should get fixed (RFC mandates that
1079 * a target can handle one immediate TMF per conn).
1081 * For nops-outs, we could have sent more than one if
1082 * the target is sending us lots of nop-ins
1084 if (opcode != ISCSI_OP_NOOP_OUT)
1087 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1089 * nop-out in response to target's nop-out rejected.
1092 /* In RX path we are under back lock */
1093 spin_unlock(&conn->session->back_lock);
1094 spin_lock(&conn->session->frwd_lock);
1095 iscsi_send_nopout(conn,
1096 (struct iscsi_nopin*)&rejected_pdu);
1097 spin_unlock(&conn->session->frwd_lock);
1098 spin_lock(&conn->session->back_lock);
1100 struct iscsi_task *task;
1102 * Our nop as ping got dropped. We know the target
1103 * and transport are ok so just clean up
1105 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1107 iscsi_conn_printk(KERN_ERR, conn,
1108 "Invalid pdu reject. Could "
1109 "not lookup rejected task.\n");
1110 rc = ISCSI_ERR_BAD_ITT;
1112 rc = iscsi_nop_out_rsp(task,
1113 (struct iscsi_nopin*)&rejected_pdu,
1118 iscsi_conn_printk(KERN_ERR, conn,
1119 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1120 "code 0x%x\n", rejected_pdu.opcode,
1121 rejected_pdu.itt, reject->reason);
1128 * iscsi_itt_to_task - look up task by itt
1129 * @conn: iscsi connection
1132 * This should be used for mgmt tasks like login and nops, or if
1133 * the LDD's itt space does not include the session age.
1135 * The session back_lock must be held.
1137 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1139 struct iscsi_session *session = conn->session;
1142 if (itt == RESERVED_ITT)
1145 if (session->tt->parse_pdu_itt)
1146 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1149 if (i >= session->cmds_max)
1152 return session->cmds[i];
1154 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1157 * __iscsi_complete_pdu - complete pdu
1159 * @hdr: iscsi header
1160 * @data: data buffer
1161 * @datalen: len of data buffer
1163 * Completes pdu processing by freeing any resources allocated at
1164 * queuecommand or send generic. session back_lock must be held and verify
1165 * itt must have been called.
1167 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1168 char *data, int datalen)
1170 struct iscsi_session *session = conn->session;
1171 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1172 struct iscsi_task *task;
1175 conn->last_recv = jiffies;
1176 rc = iscsi_verify_itt(conn, hdr->itt);
1180 if (hdr->itt != RESERVED_ITT)
1181 itt = get_itt(hdr->itt);
1185 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1186 opcode, conn->id, itt, datalen);
1189 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1192 case ISCSI_OP_NOOP_IN:
1194 rc = ISCSI_ERR_PROTO;
1198 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1201 /* In RX path we are under back lock */
1202 spin_unlock(&session->back_lock);
1203 spin_lock(&session->frwd_lock);
1204 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1205 spin_unlock(&session->frwd_lock);
1206 spin_lock(&session->back_lock);
1208 case ISCSI_OP_REJECT:
1209 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1211 case ISCSI_OP_ASYNC_EVENT:
1212 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1213 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1214 rc = ISCSI_ERR_CONN_FAILED;
1217 rc = ISCSI_ERR_BAD_OPCODE;
1224 case ISCSI_OP_SCSI_CMD_RSP:
1225 case ISCSI_OP_SCSI_DATA_IN:
1226 task = iscsi_itt_to_ctask(conn, hdr->itt);
1228 return ISCSI_ERR_BAD_ITT;
1229 task->last_xfer = jiffies;
1233 * LLD handles R2Ts if they need to.
1236 case ISCSI_OP_LOGOUT_RSP:
1237 case ISCSI_OP_LOGIN_RSP:
1238 case ISCSI_OP_TEXT_RSP:
1239 case ISCSI_OP_SCSI_TMFUNC_RSP:
1240 case ISCSI_OP_NOOP_IN:
1241 task = iscsi_itt_to_task(conn, hdr->itt);
1243 return ISCSI_ERR_BAD_ITT;
1246 return ISCSI_ERR_BAD_OPCODE;
1250 case ISCSI_OP_SCSI_CMD_RSP:
1251 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1253 case ISCSI_OP_SCSI_DATA_IN:
1254 iscsi_data_in_rsp(conn, hdr, task);
1256 case ISCSI_OP_LOGOUT_RSP:
1257 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1259 rc = ISCSI_ERR_PROTO;
1262 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1264 case ISCSI_OP_LOGIN_RSP:
1265 case ISCSI_OP_TEXT_RSP:
1266 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1268 * login related PDU's exp_statsn is handled in
1272 case ISCSI_OP_SCSI_TMFUNC_RSP:
1273 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1275 rc = ISCSI_ERR_PROTO;
1279 iscsi_tmf_rsp(conn, hdr);
1280 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1282 case ISCSI_OP_NOOP_IN:
1283 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1284 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1285 rc = ISCSI_ERR_PROTO;
1288 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1290 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1294 rc = ISCSI_ERR_BAD_OPCODE;
1301 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1302 rc = ISCSI_ERR_CONN_FAILED;
1303 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1306 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1308 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1309 char *data, int datalen)
1313 spin_lock(&conn->session->back_lock);
1314 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1315 spin_unlock(&conn->session->back_lock);
1318 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1320 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1322 struct iscsi_session *session = conn->session;
1325 if (itt == RESERVED_ITT)
1328 if (session->tt->parse_pdu_itt)
1329 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1332 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1335 if (age != session->age) {
1336 iscsi_conn_printk(KERN_ERR, conn,
1337 "received itt %x expected session age (%x)\n",
1338 (__force u32)itt, session->age);
1339 return ISCSI_ERR_BAD_ITT;
1342 if (i >= session->cmds_max) {
1343 iscsi_conn_printk(KERN_ERR, conn,
1344 "received invalid itt index %u (max cmds "
1345 "%u.\n", i, session->cmds_max);
1346 return ISCSI_ERR_BAD_ITT;
1350 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1353 * iscsi_itt_to_ctask - look up ctask by itt
1354 * @conn: iscsi connection
1357 * This should be used for cmd tasks.
1359 * The session back_lock must be held.
1361 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1363 struct iscsi_task *task;
1365 if (iscsi_verify_itt(conn, itt))
1368 task = iscsi_itt_to_task(conn, itt);
1369 if (!task || !task->sc)
1372 if (task->sc->SCp.phase != conn->session->age) {
1373 iscsi_session_printk(KERN_ERR, conn->session,
1374 "task's session age %d, expected %d\n",
1375 task->sc->SCp.phase, conn->session->age);
1381 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1383 void iscsi_session_failure(struct iscsi_session *session,
1386 struct iscsi_conn *conn;
1388 spin_lock_bh(&session->frwd_lock);
1389 conn = session->leadconn;
1390 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1391 spin_unlock_bh(&session->frwd_lock);
1395 iscsi_get_conn(conn->cls_conn);
1396 spin_unlock_bh(&session->frwd_lock);
1398 * if the host is being removed bypass the connection
1399 * recovery initialization because we are going to kill
1402 if (err == ISCSI_ERR_INVALID_HOST)
1403 iscsi_conn_error_event(conn->cls_conn, err);
1405 iscsi_conn_failure(conn, err);
1406 iscsi_put_conn(conn->cls_conn);
1408 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1410 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1412 struct iscsi_session *session = conn->session;
1414 spin_lock_bh(&session->frwd_lock);
1415 if (session->state == ISCSI_STATE_FAILED) {
1416 spin_unlock_bh(&session->frwd_lock);
1420 if (conn->stop_stage == 0)
1421 session->state = ISCSI_STATE_FAILED;
1422 spin_unlock_bh(&session->frwd_lock);
1424 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1425 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1426 iscsi_conn_error_event(conn->cls_conn, err);
1428 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1430 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1432 struct iscsi_session *session = conn->session;
1435 * Check for iSCSI window and take care of CmdSN wrap-around
1437 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1438 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1439 "%u MaxCmdSN %u CmdSN %u/%u\n",
1440 session->exp_cmdsn, session->max_cmdsn,
1441 session->cmdsn, session->queued_cmdsn);
1447 static int iscsi_xmit_task(struct iscsi_conn *conn)
1449 struct iscsi_task *task = conn->task;
1452 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1455 spin_lock_bh(&conn->session->back_lock);
1456 if (conn->task == NULL) {
1457 spin_unlock_bh(&conn->session->back_lock);
1460 __iscsi_get_task(task);
1461 spin_unlock_bh(&conn->session->back_lock);
1462 spin_unlock_bh(&conn->session->frwd_lock);
1463 rc = conn->session->tt->xmit_task(task);
1464 spin_lock_bh(&conn->session->frwd_lock);
1466 /* done with this task */
1467 task->last_xfer = jiffies;
1470 /* regular RX path uses back_lock */
1471 spin_lock(&conn->session->back_lock);
1472 __iscsi_put_task(task);
1473 spin_unlock(&conn->session->back_lock);
1478 * iscsi_requeue_task - requeue task to run from session workqueue
1479 * @task: task to requeue
1481 * LLDs that need to run a task from the session workqueue should call
1482 * this. The session frwd_lock must be held. This should only be called
1483 * by software drivers.
1485 void iscsi_requeue_task(struct iscsi_task *task)
1487 struct iscsi_conn *conn = task->conn;
1490 * this may be on the requeue list already if the xmit_task callout
1491 * is handling the r2ts while we are adding new ones
1493 spin_lock_bh(&conn->taskqueuelock);
1494 if (list_empty(&task->running))
1495 list_add_tail(&task->running, &conn->requeue);
1496 spin_unlock_bh(&conn->taskqueuelock);
1497 iscsi_conn_queue_work(conn);
1499 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1502 * iscsi_data_xmit - xmit any command into the scheduled connection
1503 * @conn: iscsi connection
1506 * The function can return -EAGAIN in which case the caller must
1507 * re-schedule it again later or recover. '0' return code means
1510 static int iscsi_data_xmit(struct iscsi_conn *conn)
1512 struct iscsi_task *task;
1515 spin_lock_bh(&conn->session->frwd_lock);
1516 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1517 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1518 spin_unlock_bh(&conn->session->frwd_lock);
1523 rc = iscsi_xmit_task(conn);
1529 * process mgmt pdus like nops before commands since we should
1530 * only have one nop-out as a ping from us and targets should not
1531 * overflow us with nop-ins
1533 spin_lock_bh(&conn->taskqueuelock);
1535 while (!list_empty(&conn->mgmtqueue)) {
1536 conn->task = list_entry(conn->mgmtqueue.next,
1537 struct iscsi_task, running);
1538 list_del_init(&conn->task->running);
1539 spin_unlock_bh(&conn->taskqueuelock);
1540 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1541 /* regular RX path uses back_lock */
1542 spin_lock_bh(&conn->session->back_lock);
1543 __iscsi_put_task(conn->task);
1544 spin_unlock_bh(&conn->session->back_lock);
1546 spin_lock_bh(&conn->taskqueuelock);
1549 rc = iscsi_xmit_task(conn);
1552 spin_lock_bh(&conn->taskqueuelock);
1555 /* process pending command queue */
1556 while (!list_empty(&conn->cmdqueue)) {
1557 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1559 list_del_init(&conn->task->running);
1560 spin_unlock_bh(&conn->taskqueuelock);
1561 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1562 fail_scsi_task(conn->task, DID_IMM_RETRY);
1563 spin_lock_bh(&conn->taskqueuelock);
1566 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1568 if (rc == -ENOMEM || rc == -EACCES)
1569 fail_scsi_task(conn->task, DID_IMM_RETRY);
1571 fail_scsi_task(conn->task, DID_ABORT);
1572 spin_lock_bh(&conn->taskqueuelock);
1575 rc = iscsi_xmit_task(conn);
1579 * we could continuously get new task requests so
1580 * we need to check the mgmt queue for nops that need to
1581 * be sent to aviod starvation
1583 spin_lock_bh(&conn->taskqueuelock);
1584 if (!list_empty(&conn->mgmtqueue))
1588 while (!list_empty(&conn->requeue)) {
1590 * we always do fastlogout - conn stop code will clean up.
1592 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1595 task = list_entry(conn->requeue.next, struct iscsi_task,
1597 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1601 list_del_init(&conn->task->running);
1602 conn->task->state = ISCSI_TASK_RUNNING;
1603 spin_unlock_bh(&conn->taskqueuelock);
1604 rc = iscsi_xmit_task(conn);
1607 spin_lock_bh(&conn->taskqueuelock);
1608 if (!list_empty(&conn->mgmtqueue))
1611 spin_unlock_bh(&conn->taskqueuelock);
1612 spin_unlock_bh(&conn->session->frwd_lock);
1616 spin_unlock_bh(&conn->session->frwd_lock);
1620 static void iscsi_xmitworker(struct work_struct *work)
1622 struct iscsi_conn *conn =
1623 container_of(work, struct iscsi_conn, xmitwork);
1626 * serialize Xmit worker on a per-connection basis.
1629 rc = iscsi_data_xmit(conn);
1630 } while (rc >= 0 || rc == -EAGAIN);
1633 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1634 struct scsi_cmnd *sc)
1636 struct iscsi_task *task;
1638 if (!kfifo_out(&conn->session->cmdpool.queue,
1639 (void *) &task, sizeof(void *)))
1642 sc->SCp.phase = conn->session->age;
1643 sc->SCp.ptr = (char *) task;
1645 atomic_set(&task->refcount, 1);
1646 task->state = ISCSI_TASK_PENDING;
1649 task->have_checked_conn = false;
1650 task->last_timeout = jiffies;
1651 task->last_xfer = jiffies;
1652 task->protected = false;
1653 INIT_LIST_HEAD(&task->running);
1658 FAILURE_BAD_HOST = 1,
1659 FAILURE_SESSION_FAILED,
1660 FAILURE_SESSION_FREED,
1661 FAILURE_WINDOW_CLOSED,
1663 FAILURE_SESSION_TERMINATE,
1664 FAILURE_SESSION_IN_RECOVERY,
1665 FAILURE_SESSION_RECOVERY_TIMEOUT,
1666 FAILURE_SESSION_LOGGING_OUT,
1667 FAILURE_SESSION_NOT_READY,
1670 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1672 struct iscsi_cls_session *cls_session;
1673 struct iscsi_host *ihost;
1675 struct iscsi_session *session;
1676 struct iscsi_conn *conn;
1677 struct iscsi_task *task = NULL;
1682 ihost = shost_priv(host);
1684 cls_session = starget_to_session(scsi_target(sc->device));
1685 session = cls_session->dd_data;
1686 spin_lock_bh(&session->frwd_lock);
1688 reason = iscsi_session_chkready(cls_session);
1690 sc->result = reason;
1694 if (session->state != ISCSI_STATE_LOGGED_IN) {
1696 * to handle the race between when we set the recovery state
1697 * and block the session we requeue here (commands could
1698 * be entering our queuecommand while a block is starting
1699 * up because the block code is not locked)
1701 switch (session->state) {
1702 case ISCSI_STATE_FAILED:
1704 * cmds should fail during shutdown, if the session
1705 * state is bad, allowing completion to happen
1707 if (unlikely(system_state != SYSTEM_RUNNING)) {
1708 reason = FAILURE_SESSION_FAILED;
1709 sc->result = DID_NO_CONNECT << 16;
1712 case ISCSI_STATE_IN_RECOVERY:
1713 reason = FAILURE_SESSION_IN_RECOVERY;
1714 sc->result = DID_IMM_RETRY << 16;
1716 case ISCSI_STATE_LOGGING_OUT:
1717 reason = FAILURE_SESSION_LOGGING_OUT;
1718 sc->result = DID_IMM_RETRY << 16;
1720 case ISCSI_STATE_RECOVERY_FAILED:
1721 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1722 sc->result = DID_TRANSPORT_FAILFAST << 16;
1724 case ISCSI_STATE_TERMINATE:
1725 reason = FAILURE_SESSION_TERMINATE;
1726 sc->result = DID_NO_CONNECT << 16;
1729 reason = FAILURE_SESSION_FREED;
1730 sc->result = DID_NO_CONNECT << 16;
1735 conn = session->leadconn;
1737 reason = FAILURE_SESSION_FREED;
1738 sc->result = DID_NO_CONNECT << 16;
1742 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1743 reason = FAILURE_SESSION_IN_RECOVERY;
1744 sc->result = DID_REQUEUE << 16;
1748 if (iscsi_check_cmdsn_window_closed(conn)) {
1749 reason = FAILURE_WINDOW_CLOSED;
1753 task = iscsi_alloc_task(conn, sc);
1755 reason = FAILURE_OOM;
1759 if (!ihost->workq) {
1760 reason = iscsi_prep_scsi_cmd_pdu(task);
1762 if (reason == -ENOMEM || reason == -EACCES) {
1763 reason = FAILURE_OOM;
1766 sc->result = DID_ABORT << 16;
1770 if (session->tt->xmit_task(task)) {
1772 reason = FAILURE_SESSION_NOT_READY;
1776 spin_lock_bh(&conn->taskqueuelock);
1777 list_add_tail(&task->running, &conn->cmdqueue);
1778 spin_unlock_bh(&conn->taskqueuelock);
1779 iscsi_conn_queue_work(conn);
1782 session->queued_cmdsn++;
1783 spin_unlock_bh(&session->frwd_lock);
1787 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1789 spin_unlock_bh(&session->frwd_lock);
1790 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1791 sc->cmnd[0], reason);
1792 return SCSI_MLQUEUE_TARGET_BUSY;
1795 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1797 spin_unlock_bh(&session->frwd_lock);
1798 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1799 sc->cmnd[0], reason);
1800 if (!scsi_bidi_cmnd(sc))
1801 scsi_set_resid(sc, scsi_bufflen(sc));
1803 scsi_out(sc)->resid = scsi_out(sc)->length;
1804 scsi_in(sc)->resid = scsi_in(sc)->length;
1809 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1811 int iscsi_target_alloc(struct scsi_target *starget)
1813 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1814 struct iscsi_session *session = cls_session->dd_data;
1816 starget->can_queue = session->scsi_cmds_max;
1819 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1821 static void iscsi_tmf_timedout(unsigned long data)
1823 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1824 struct iscsi_session *session = conn->session;
1826 spin_lock(&session->frwd_lock);
1827 if (conn->tmf_state == TMF_QUEUED) {
1828 conn->tmf_state = TMF_TIMEDOUT;
1829 ISCSI_DBG_EH(session, "tmf timedout\n");
1830 /* unblock eh_abort() */
1831 wake_up(&conn->ehwait);
1833 spin_unlock(&session->frwd_lock);
1836 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1837 struct iscsi_tm *hdr, int age,
1840 struct iscsi_session *session = conn->session;
1841 struct iscsi_task *task;
1843 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1846 spin_unlock_bh(&session->frwd_lock);
1847 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1848 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1849 spin_lock_bh(&session->frwd_lock);
1852 conn->tmfcmd_pdus_cnt++;
1853 conn->tmf_timer.expires = timeout * HZ + jiffies;
1854 conn->tmf_timer.function = iscsi_tmf_timedout;
1855 conn->tmf_timer.data = (unsigned long)conn;
1856 add_timer(&conn->tmf_timer);
1857 ISCSI_DBG_EH(session, "tmf set timeout\n");
1859 spin_unlock_bh(&session->frwd_lock);
1860 mutex_unlock(&session->eh_mutex);
1863 * block eh thread until:
1867 * 3) session is terminated or restarted or userspace has
1868 * given up on recovery
1870 wait_event_interruptible(conn->ehwait, age != session->age ||
1871 session->state != ISCSI_STATE_LOGGED_IN ||
1872 conn->tmf_state != TMF_QUEUED);
1873 if (signal_pending(current))
1874 flush_signals(current);
1875 del_timer_sync(&conn->tmf_timer);
1877 mutex_lock(&session->eh_mutex);
1878 spin_lock_bh(&session->frwd_lock);
1879 /* if the session drops it will clean up the task */
1880 if (age != session->age ||
1881 session->state != ISCSI_STATE_LOGGED_IN)
1887 * Fail commands. session lock held and recv side suspended and xmit
1890 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1892 struct iscsi_task *task;
1895 for (i = 0; i < conn->session->cmds_max; i++) {
1896 task = conn->session->cmds[i];
1897 if (!task->sc || task->state == ISCSI_TASK_FREE)
1900 if (lun != -1 && lun != task->sc->device->lun)
1903 ISCSI_DBG_SESSION(conn->session,
1904 "failing sc %p itt 0x%x state %d\n",
1905 task->sc, task->itt, task->state);
1906 fail_scsi_task(task, error);
1911 * iscsi_suspend_queue - suspend iscsi_queuecommand
1912 * @conn: iscsi conn to stop queueing IO on
1914 * This grabs the session frwd_lock to make sure no one is in
1915 * xmit_task/queuecommand, and then sets suspend to prevent
1916 * new commands from being queued. This only needs to be called
1917 * by offload drivers that need to sync a path like ep disconnect
1918 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1919 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1921 void iscsi_suspend_queue(struct iscsi_conn *conn)
1923 spin_lock_bh(&conn->session->frwd_lock);
1924 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1925 spin_unlock_bh(&conn->session->frwd_lock);
1927 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1930 * iscsi_suspend_tx - suspend iscsi_data_xmit
1931 * @conn: iscsi conn tp stop processing IO on.
1933 * This function sets the suspend bit to prevent iscsi_data_xmit
1934 * from sending new IO, and if work is queued on the xmit thread
1935 * it will wait for it to be completed.
1937 void iscsi_suspend_tx(struct iscsi_conn *conn)
1939 struct Scsi_Host *shost = conn->session->host;
1940 struct iscsi_host *ihost = shost_priv(shost);
1942 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1944 flush_workqueue(ihost->workq);
1946 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1948 static void iscsi_start_tx(struct iscsi_conn *conn)
1950 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1951 iscsi_conn_queue_work(conn);
1955 * We want to make sure a ping is in flight. It has timed out.
1956 * And we are not busy processing a pdu that is making
1957 * progress but got started before the ping and is taking a while
1958 * to complete so the ping is just stuck behind it in a queue.
1960 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1962 if (READ_ONCE(conn->ping_task) &&
1963 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1964 (conn->ping_timeout * HZ), jiffies))
1970 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1972 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1973 struct iscsi_task *task = NULL, *running_task;
1974 struct iscsi_cls_session *cls_session;
1975 struct iscsi_session *session;
1976 struct iscsi_conn *conn;
1979 cls_session = starget_to_session(scsi_target(sc->device));
1980 session = cls_session->dd_data;
1982 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1984 spin_lock_bh(&session->frwd_lock);
1985 task = (struct iscsi_task *)sc->SCp.ptr;
1988 * Raced with completion. Blk layer has taken ownership
1989 * so let timeout code complete it now.
1991 rc = BLK_EH_HANDLED;
1995 if (session->state != ISCSI_STATE_LOGGED_IN) {
1997 * During shutdown, if session is prematurely disconnected,
1998 * recovery won't happen and there will be hung cmds. Not
1999 * handling cmds would trigger EH, also bad in this case.
2000 * Instead, handle cmd, allow completion to happen and let
2001 * upper layer to deal with the result.
2003 if (unlikely(system_state != SYSTEM_RUNNING)) {
2004 sc->result = DID_NO_CONNECT << 16;
2005 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2006 rc = BLK_EH_HANDLED;
2010 * We are probably in the middle of iscsi recovery so let
2011 * that complete and handle the error.
2013 rc = BLK_EH_RESET_TIMER;
2017 conn = session->leadconn;
2019 /* In the middle of shuting down */
2020 rc = BLK_EH_RESET_TIMER;
2025 * If we have sent (at least queued to the network layer) a pdu or
2026 * recvd one for the task since the last timeout ask for
2027 * more time. If on the next timeout we have not made progress
2028 * we can check if it is the task or connection when we send the
2031 if (time_after(task->last_xfer, task->last_timeout)) {
2032 ISCSI_DBG_EH(session, "Command making progress. Asking "
2033 "scsi-ml for more time to complete. "
2034 "Last data xfer at %lu. Last timeout was at "
2035 "%lu\n.", task->last_xfer, task->last_timeout);
2036 task->have_checked_conn = false;
2037 rc = BLK_EH_RESET_TIMER;
2041 if (!conn->recv_timeout && !conn->ping_timeout)
2044 * if the ping timedout then we are in the middle of cleaning up
2045 * and can let the iscsi eh handle it
2047 if (iscsi_has_ping_timed_out(conn)) {
2048 rc = BLK_EH_RESET_TIMER;
2052 for (i = 0; i < conn->session->cmds_max; i++) {
2053 running_task = conn->session->cmds[i];
2054 if (!running_task->sc || running_task == task ||
2055 running_task->state != ISCSI_TASK_RUNNING)
2059 * Only check if cmds started before this one have made
2060 * progress, or this could never fail
2062 if (time_after(running_task->sc->jiffies_at_alloc,
2063 task->sc->jiffies_at_alloc))
2066 if (time_after(running_task->last_xfer, task->last_timeout)) {
2068 * This task has not made progress, but a task
2069 * started before us has transferred data since
2070 * we started/last-checked. We could be queueing
2071 * too many tasks or the LU is bad.
2073 * If the device is bad the cmds ahead of us on
2074 * other devs will complete, and this loop will
2075 * eventually fail starting the scsi eh.
2077 ISCSI_DBG_EH(session, "Command has not made progress "
2078 "but commands ahead of it have. "
2079 "Asking scsi-ml for more time to "
2080 "complete. Our last xfer vs running task "
2081 "last xfer %lu/%lu. Last check %lu.\n",
2082 task->last_xfer, running_task->last_xfer,
2083 task->last_timeout);
2084 rc = BLK_EH_RESET_TIMER;
2089 /* Assumes nop timeout is shorter than scsi cmd timeout */
2090 if (task->have_checked_conn)
2094 * Checking the transport already or nop from a cmd timeout still
2097 if (READ_ONCE(conn->ping_task)) {
2098 task->have_checked_conn = true;
2099 rc = BLK_EH_RESET_TIMER;
2103 /* Make sure there is a transport check done */
2104 iscsi_send_nopout(conn, NULL);
2105 task->have_checked_conn = true;
2106 rc = BLK_EH_RESET_TIMER;
2110 task->last_timeout = jiffies;
2111 spin_unlock_bh(&session->frwd_lock);
2112 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2113 "timer reset" : "shutdown or nh");
2117 static void iscsi_check_transport_timeouts(unsigned long data)
2119 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2120 struct iscsi_session *session = conn->session;
2121 unsigned long recv_timeout, next_timeout = 0, last_recv;
2123 spin_lock(&session->frwd_lock);
2124 if (session->state != ISCSI_STATE_LOGGED_IN)
2127 recv_timeout = conn->recv_timeout;
2132 last_recv = conn->last_recv;
2134 if (iscsi_has_ping_timed_out(conn)) {
2135 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2136 "expired, recv timeout %d, last rx %lu, "
2137 "last ping %lu, now %lu\n",
2138 conn->ping_timeout, conn->recv_timeout,
2139 last_recv, conn->last_ping, jiffies);
2140 spin_unlock(&session->frwd_lock);
2141 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2145 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2146 /* send a ping to try to provoke some traffic */
2147 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2148 if (iscsi_send_nopout(conn, NULL))
2149 next_timeout = jiffies + (1 * HZ);
2151 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2153 next_timeout = last_recv + recv_timeout;
2155 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2156 mod_timer(&conn->transport_timer, next_timeout);
2158 spin_unlock(&session->frwd_lock);
2161 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2162 struct iscsi_tm *hdr)
2164 memset(hdr, 0, sizeof(*hdr));
2165 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2166 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2167 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2168 hdr->lun = task->lun;
2169 hdr->rtt = task->hdr_itt;
2170 hdr->refcmdsn = task->cmdsn;
2173 int iscsi_eh_abort(struct scsi_cmnd *sc)
2175 struct iscsi_cls_session *cls_session;
2176 struct iscsi_session *session;
2177 struct iscsi_conn *conn;
2178 struct iscsi_task *task;
2179 struct iscsi_tm *hdr;
2182 cls_session = starget_to_session(scsi_target(sc->device));
2183 session = cls_session->dd_data;
2185 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2187 mutex_lock(&session->eh_mutex);
2188 spin_lock_bh(&session->frwd_lock);
2190 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2194 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2196 spin_unlock_bh(&session->frwd_lock);
2197 mutex_unlock(&session->eh_mutex);
2202 * If we are not logged in or we have started a new session
2203 * then let the host reset code handle this
2205 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2206 sc->SCp.phase != session->age) {
2207 spin_unlock_bh(&session->frwd_lock);
2208 mutex_unlock(&session->eh_mutex);
2209 ISCSI_DBG_EH(session, "failing abort due to dropped "
2214 conn = session->leadconn;
2215 conn->eh_abort_cnt++;
2218 task = (struct iscsi_task *)sc->SCp.ptr;
2219 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2222 /* task completed before time out */
2224 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2228 if (task->state == ISCSI_TASK_PENDING) {
2229 fail_scsi_task(task, DID_ABORT);
2233 /* only have one tmf outstanding at a time */
2234 if (conn->tmf_state != TMF_INITIAL)
2236 conn->tmf_state = TMF_QUEUED;
2239 iscsi_prep_abort_task_pdu(task, hdr);
2241 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2244 switch (conn->tmf_state) {
2246 spin_unlock_bh(&session->frwd_lock);
2248 * stop tx side incase the target had sent a abort rsp but
2249 * the initiator was still writing out data.
2251 iscsi_suspend_tx(conn);
2253 * we do not stop the recv side because targets have been
2254 * good and have never sent us a successful tmf response
2255 * then sent more data for the cmd.
2257 spin_lock_bh(&session->frwd_lock);
2258 fail_scsi_task(task, DID_ABORT);
2259 conn->tmf_state = TMF_INITIAL;
2260 memset(hdr, 0, sizeof(*hdr));
2261 spin_unlock_bh(&session->frwd_lock);
2262 iscsi_start_tx(conn);
2263 goto success_unlocked;
2265 spin_unlock_bh(&session->frwd_lock);
2266 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2267 goto failed_unlocked;
2270 conn->tmf_state = TMF_INITIAL;
2271 memset(hdr, 0, sizeof(*hdr));
2272 /* task completed before tmf abort response */
2273 ISCSI_DBG_EH(session, "sc completed while abort in "
2279 conn->tmf_state = TMF_INITIAL;
2284 spin_unlock_bh(&session->frwd_lock);
2286 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2288 mutex_unlock(&session->eh_mutex);
2292 spin_unlock_bh(&session->frwd_lock);
2294 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2295 task ? task->itt : 0);
2296 mutex_unlock(&session->eh_mutex);
2299 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2301 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2303 memset(hdr, 0, sizeof(*hdr));
2304 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2305 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2306 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2307 int_to_scsilun(sc->device->lun, &hdr->lun);
2308 hdr->rtt = RESERVED_ITT;
2311 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2313 struct iscsi_cls_session *cls_session;
2314 struct iscsi_session *session;
2315 struct iscsi_conn *conn;
2316 struct iscsi_tm *hdr;
2319 cls_session = starget_to_session(scsi_target(sc->device));
2320 session = cls_session->dd_data;
2322 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2325 mutex_lock(&session->eh_mutex);
2326 spin_lock_bh(&session->frwd_lock);
2328 * Just check if we are not logged in. We cannot check for
2329 * the phase because the reset could come from a ioctl.
2331 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2333 conn = session->leadconn;
2335 /* only have one tmf outstanding at a time */
2336 if (conn->tmf_state != TMF_INITIAL)
2338 conn->tmf_state = TMF_QUEUED;
2341 iscsi_prep_lun_reset_pdu(sc, hdr);
2343 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2344 session->lu_reset_timeout)) {
2349 switch (conn->tmf_state) {
2353 spin_unlock_bh(&session->frwd_lock);
2354 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2357 conn->tmf_state = TMF_INITIAL;
2362 spin_unlock_bh(&session->frwd_lock);
2364 iscsi_suspend_tx(conn);
2366 spin_lock_bh(&session->frwd_lock);
2367 memset(hdr, 0, sizeof(*hdr));
2368 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2369 conn->tmf_state = TMF_INITIAL;
2370 spin_unlock_bh(&session->frwd_lock);
2372 iscsi_start_tx(conn);
2376 spin_unlock_bh(&session->frwd_lock);
2378 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2379 rc == SUCCESS ? "SUCCESS" : "FAILED");
2380 mutex_unlock(&session->eh_mutex);
2383 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2385 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2387 struct iscsi_session *session = cls_session->dd_data;
2389 spin_lock_bh(&session->frwd_lock);
2390 if (session->state != ISCSI_STATE_LOGGED_IN) {
2391 session->state = ISCSI_STATE_RECOVERY_FAILED;
2392 if (session->leadconn)
2393 wake_up(&session->leadconn->ehwait);
2395 spin_unlock_bh(&session->frwd_lock);
2397 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2400 * iscsi_eh_session_reset - drop session and attempt relogin
2403 * This function will wait for a relogin, session termination from
2404 * userspace, or a recovery/replacement timeout.
2406 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2408 struct iscsi_cls_session *cls_session;
2409 struct iscsi_session *session;
2410 struct iscsi_conn *conn;
2412 cls_session = starget_to_session(scsi_target(sc->device));
2413 session = cls_session->dd_data;
2414 conn = session->leadconn;
2416 mutex_lock(&session->eh_mutex);
2417 spin_lock_bh(&session->frwd_lock);
2418 if (session->state == ISCSI_STATE_TERMINATE) {
2420 ISCSI_DBG_EH(session,
2421 "failing session reset: Could not log back into "
2422 "%s [age %d]\n", session->targetname,
2424 spin_unlock_bh(&session->frwd_lock);
2425 mutex_unlock(&session->eh_mutex);
2429 spin_unlock_bh(&session->frwd_lock);
2430 mutex_unlock(&session->eh_mutex);
2432 * we drop the lock here but the leadconn cannot be destoyed while
2433 * we are in the scsi eh
2435 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2437 ISCSI_DBG_EH(session, "wait for relogin\n");
2438 wait_event_interruptible(conn->ehwait,
2439 session->state == ISCSI_STATE_TERMINATE ||
2440 session->state == ISCSI_STATE_LOGGED_IN ||
2441 session->state == ISCSI_STATE_RECOVERY_FAILED);
2442 if (signal_pending(current))
2443 flush_signals(current);
2445 mutex_lock(&session->eh_mutex);
2446 spin_lock_bh(&session->frwd_lock);
2447 if (session->state == ISCSI_STATE_LOGGED_IN) {
2448 ISCSI_DBG_EH(session,
2449 "session reset succeeded for %s,%s\n",
2450 session->targetname, conn->persistent_address);
2453 spin_unlock_bh(&session->frwd_lock);
2454 mutex_unlock(&session->eh_mutex);
2457 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2459 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2461 memset(hdr, 0, sizeof(*hdr));
2462 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2463 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2464 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2465 hdr->rtt = RESERVED_ITT;
2469 * iscsi_eh_target_reset - reset target
2472 * This will attempt to send a warm target reset.
2474 static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2476 struct iscsi_cls_session *cls_session;
2477 struct iscsi_session *session;
2478 struct iscsi_conn *conn;
2479 struct iscsi_tm *hdr;
2482 cls_session = starget_to_session(scsi_target(sc->device));
2483 session = cls_session->dd_data;
2485 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2486 session->targetname);
2488 mutex_lock(&session->eh_mutex);
2489 spin_lock_bh(&session->frwd_lock);
2491 * Just check if we are not logged in. We cannot check for
2492 * the phase because the reset could come from a ioctl.
2494 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2496 conn = session->leadconn;
2498 /* only have one tmf outstanding at a time */
2499 if (conn->tmf_state != TMF_INITIAL)
2501 conn->tmf_state = TMF_QUEUED;
2504 iscsi_prep_tgt_reset_pdu(sc, hdr);
2506 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2507 session->tgt_reset_timeout)) {
2512 switch (conn->tmf_state) {
2516 spin_unlock_bh(&session->frwd_lock);
2517 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2520 conn->tmf_state = TMF_INITIAL;
2525 spin_unlock_bh(&session->frwd_lock);
2527 iscsi_suspend_tx(conn);
2529 spin_lock_bh(&session->frwd_lock);
2530 memset(hdr, 0, sizeof(*hdr));
2531 fail_scsi_tasks(conn, -1, DID_ERROR);
2532 conn->tmf_state = TMF_INITIAL;
2533 spin_unlock_bh(&session->frwd_lock);
2535 iscsi_start_tx(conn);
2539 spin_unlock_bh(&session->frwd_lock);
2541 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2542 rc == SUCCESS ? "SUCCESS" : "FAILED");
2543 mutex_unlock(&session->eh_mutex);
2548 * iscsi_eh_recover_target - reset target and possibly the session
2551 * This will attempt to send a warm target reset. If that fails,
2552 * we will escalate to ERL0 session recovery.
2554 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2558 rc = iscsi_eh_target_reset(sc);
2560 rc = iscsi_eh_session_reset(sc);
2563 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2566 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2567 * should be accessed via kfifo_{get,put} on q->queue.
2568 * Optionally, the caller can obtain the array of object pointers
2569 * by passing in a non-NULL @items pointer
2572 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2574 int i, num_arrays = 1;
2576 memset(q, 0, sizeof(*q));
2580 /* If the user passed an items pointer, he wants a copy of
2584 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2585 if (q->pool == NULL)
2588 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2590 for (i = 0; i < max; i++) {
2591 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2592 if (q->pool[i] == NULL) {
2596 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2600 *items = q->pool + max;
2601 memcpy(*items, q->pool, max * sizeof(void *));
2610 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2612 void iscsi_pool_free(struct iscsi_pool *q)
2616 for (i = 0; i < q->max; i++)
2620 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2623 * iscsi_host_add - add host to system
2625 * @pdev: parent device
2627 * This should be called by partial offload and software iscsi drivers
2628 * to add a host to the system.
2630 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2632 if (!shost->can_queue)
2633 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2635 if (!shost->cmd_per_lun)
2636 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2638 if (!shost->transportt->eh_timed_out)
2639 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2640 return scsi_add_host(shost, pdev);
2642 EXPORT_SYMBOL_GPL(iscsi_host_add);
2645 * iscsi_host_alloc - allocate a host and driver data
2646 * @sht: scsi host template
2647 * @dd_data_size: driver host data size
2648 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2650 * This should be called by partial offload and software iscsi drivers.
2651 * To access the driver specific memory use the iscsi_host_priv() macro.
2653 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2654 int dd_data_size, bool xmit_can_sleep)
2656 struct Scsi_Host *shost;
2657 struct iscsi_host *ihost;
2659 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2662 ihost = shost_priv(shost);
2664 if (xmit_can_sleep) {
2665 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2666 "iscsi_q_%d", shost->host_no);
2667 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2672 spin_lock_init(&ihost->lock);
2673 ihost->state = ISCSI_HOST_SETUP;
2674 ihost->num_sessions = 0;
2675 init_waitqueue_head(&ihost->session_removal_wq);
2679 scsi_host_put(shost);
2682 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2684 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2686 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2690 * iscsi_host_remove - remove host and sessions
2693 * If there are any sessions left, this will initiate the removal and wait
2694 * for the completion.
2696 void iscsi_host_remove(struct Scsi_Host *shost)
2698 struct iscsi_host *ihost = shost_priv(shost);
2699 unsigned long flags;
2701 spin_lock_irqsave(&ihost->lock, flags);
2702 ihost->state = ISCSI_HOST_REMOVED;
2703 spin_unlock_irqrestore(&ihost->lock, flags);
2705 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2706 wait_event_interruptible(ihost->session_removal_wq,
2707 ihost->num_sessions == 0);
2708 if (signal_pending(current))
2709 flush_signals(current);
2711 scsi_remove_host(shost);
2713 destroy_workqueue(ihost->workq);
2715 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2717 void iscsi_host_free(struct Scsi_Host *shost)
2719 struct iscsi_host *ihost = shost_priv(shost);
2721 kfree(ihost->netdev);
2722 kfree(ihost->hwaddress);
2723 kfree(ihost->initiatorname);
2724 scsi_host_put(shost);
2726 EXPORT_SYMBOL_GPL(iscsi_host_free);
2728 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2730 struct iscsi_host *ihost = shost_priv(shost);
2731 unsigned long flags;
2733 shost = scsi_host_get(shost);
2735 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2736 "of session teardown event because host already "
2741 spin_lock_irqsave(&ihost->lock, flags);
2742 ihost->num_sessions--;
2743 if (ihost->num_sessions == 0)
2744 wake_up(&ihost->session_removal_wq);
2745 spin_unlock_irqrestore(&ihost->lock, flags);
2746 scsi_host_put(shost);
2750 * iscsi_session_setup - create iscsi cls session and host and session
2751 * @iscsit: iscsi transport template
2753 * @cmds_max: session can queue
2754 * @cmd_task_size: LLD task private data size
2755 * @initial_cmdsn: initial CmdSN
2757 * This can be used by software iscsi_transports that allocate
2758 * a session per scsi host.
2760 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2761 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2762 * for nop handling and login/logout requests.
2764 struct iscsi_cls_session *
2765 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2766 uint16_t cmds_max, int dd_size, int cmd_task_size,
2767 uint32_t initial_cmdsn, unsigned int id)
2769 struct iscsi_host *ihost = shost_priv(shost);
2770 struct iscsi_session *session;
2771 struct iscsi_cls_session *cls_session;
2772 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2773 unsigned long flags;
2775 spin_lock_irqsave(&ihost->lock, flags);
2776 if (ihost->state == ISCSI_HOST_REMOVED) {
2777 spin_unlock_irqrestore(&ihost->lock, flags);
2780 ihost->num_sessions++;
2781 spin_unlock_irqrestore(&ihost->lock, flags);
2784 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2786 * The iscsi layer needs some tasks for nop handling and tmfs,
2787 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2788 * + 1 command for scsi IO.
2790 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2791 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2792 "must be a power of two that is at least %d.\n",
2793 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2794 goto dec_session_count;
2797 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2798 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2799 "must be a power of 2 less than or equal to %d.\n",
2800 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2801 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2804 if (!is_power_of_2(total_cmds)) {
2805 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2806 "must be a power of 2.\n", total_cmds);
2807 total_cmds = rounddown_pow_of_two(total_cmds);
2808 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2810 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2813 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2815 cls_session = iscsi_alloc_session(shost, iscsit,
2816 sizeof(struct iscsi_session) +
2819 goto dec_session_count;
2820 session = cls_session->dd_data;
2821 session->cls_session = cls_session;
2822 session->host = shost;
2823 session->state = ISCSI_STATE_FREE;
2824 session->fast_abort = 1;
2825 session->tgt_reset_timeout = 30;
2826 session->lu_reset_timeout = 15;
2827 session->abort_timeout = 10;
2828 session->scsi_cmds_max = scsi_cmds;
2829 session->cmds_max = total_cmds;
2830 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2831 session->exp_cmdsn = initial_cmdsn + 1;
2832 session->max_cmdsn = initial_cmdsn + 1;
2833 session->max_r2t = 1;
2834 session->tt = iscsit;
2835 session->dd_data = cls_session->dd_data + sizeof(*session);
2837 mutex_init(&session->eh_mutex);
2838 spin_lock_init(&session->frwd_lock);
2839 spin_lock_init(&session->back_lock);
2841 /* initialize SCSI PDU commands pool */
2842 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2843 (void***)&session->cmds,
2844 cmd_task_size + sizeof(struct iscsi_task)))
2845 goto cmdpool_alloc_fail;
2847 /* pre-format cmds pool with ITT */
2848 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2849 struct iscsi_task *task = session->cmds[cmd_i];
2852 task->dd_data = &task[1];
2854 task->state = ISCSI_TASK_FREE;
2855 INIT_LIST_HEAD(&task->running);
2858 if (!try_module_get(iscsit->owner))
2859 goto module_get_fail;
2861 if (iscsi_add_session(cls_session, id))
2862 goto cls_session_fail;
2867 module_put(iscsit->owner);
2869 iscsi_pool_free(&session->cmdpool);
2871 iscsi_free_session(cls_session);
2873 iscsi_host_dec_session_cnt(shost);
2876 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2879 * iscsi_session_teardown - destroy session, host, and cls_session
2880 * @cls_session: iscsi session
2882 * The driver must have called iscsi_remove_session before
2885 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2887 struct iscsi_session *session = cls_session->dd_data;
2888 struct module *owner = cls_session->transport->owner;
2889 struct Scsi_Host *shost = session->host;
2891 iscsi_pool_free(&session->cmdpool);
2893 kfree(session->password);
2894 kfree(session->password_in);
2895 kfree(session->username);
2896 kfree(session->username_in);
2897 kfree(session->targetname);
2898 kfree(session->targetalias);
2899 kfree(session->initiatorname);
2900 kfree(session->boot_root);
2901 kfree(session->boot_nic);
2902 kfree(session->boot_target);
2903 kfree(session->ifacename);
2904 kfree(session->portal_type);
2905 kfree(session->discovery_parent_type);
2907 iscsi_destroy_session(cls_session);
2908 iscsi_host_dec_session_cnt(shost);
2911 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2914 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2915 * @cls_session: iscsi_cls_session
2916 * @dd_size: private driver data size
2919 struct iscsi_cls_conn *
2920 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2923 struct iscsi_session *session = cls_session->dd_data;
2924 struct iscsi_conn *conn;
2925 struct iscsi_cls_conn *cls_conn;
2928 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2932 conn = cls_conn->dd_data;
2933 memset(conn, 0, sizeof(*conn) + dd_size);
2935 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2936 conn->session = session;
2937 conn->cls_conn = cls_conn;
2938 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2939 conn->id = conn_idx;
2940 conn->exp_statsn = 0;
2941 conn->tmf_state = TMF_INITIAL;
2943 init_timer(&conn->transport_timer);
2944 conn->transport_timer.data = (unsigned long)conn;
2945 conn->transport_timer.function = iscsi_check_transport_timeouts;
2947 INIT_LIST_HEAD(&conn->mgmtqueue);
2948 INIT_LIST_HEAD(&conn->cmdqueue);
2949 INIT_LIST_HEAD(&conn->requeue);
2950 spin_lock_init(&conn->taskqueuelock);
2951 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2953 /* allocate login_task used for the login/text sequences */
2954 spin_lock_bh(&session->frwd_lock);
2955 if (!kfifo_out(&session->cmdpool.queue,
2956 (void*)&conn->login_task,
2958 spin_unlock_bh(&session->frwd_lock);
2959 goto login_task_alloc_fail;
2961 spin_unlock_bh(&session->frwd_lock);
2963 data = (char *) __get_free_pages(GFP_KERNEL,
2964 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2966 goto login_task_data_alloc_fail;
2967 conn->login_task->data = conn->data = data;
2969 init_timer(&conn->tmf_timer);
2970 init_waitqueue_head(&conn->ehwait);
2974 login_task_data_alloc_fail:
2975 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2977 login_task_alloc_fail:
2978 iscsi_destroy_conn(cls_conn);
2981 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2984 * iscsi_conn_teardown - teardown iscsi connection
2985 * cls_conn: iscsi class connection
2987 * TODO: we may need to make this into a two step process
2988 * like scsi-mls remove + put host
2990 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2992 struct iscsi_conn *conn = cls_conn->dd_data;
2993 struct iscsi_session *session = conn->session;
2994 char *tmp_persistent_address = conn->persistent_address;
2995 char *tmp_local_ipaddr = conn->local_ipaddr;
2997 del_timer_sync(&conn->transport_timer);
2999 mutex_lock(&session->eh_mutex);
3000 spin_lock_bh(&session->frwd_lock);
3001 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
3002 if (session->leadconn == conn) {
3004 * leading connection? then give up on recovery.
3006 session->state = ISCSI_STATE_TERMINATE;
3007 wake_up(&conn->ehwait);
3009 spin_unlock_bh(&session->frwd_lock);
3011 /* flush queued up work because we free the connection below */
3012 iscsi_suspend_tx(conn);
3014 spin_lock_bh(&session->frwd_lock);
3015 free_pages((unsigned long) conn->data,
3016 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3017 /* regular RX path uses back_lock */
3018 spin_lock_bh(&session->back_lock);
3019 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3021 spin_unlock_bh(&session->back_lock);
3022 if (session->leadconn == conn)
3023 session->leadconn = NULL;
3024 spin_unlock_bh(&session->frwd_lock);
3025 mutex_unlock(&session->eh_mutex);
3027 iscsi_destroy_conn(cls_conn);
3028 kfree(tmp_persistent_address);
3029 kfree(tmp_local_ipaddr);
3031 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3033 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3035 struct iscsi_conn *conn = cls_conn->dd_data;
3036 struct iscsi_session *session = conn->session;
3039 iscsi_conn_printk(KERN_ERR, conn,
3040 "can't start unbound connection\n");
3044 if ((session->imm_data_en || !session->initial_r2t_en) &&
3045 session->first_burst > session->max_burst) {
3046 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3047 "first_burst %d max_burst %d\n",
3048 session->first_burst, session->max_burst);
3052 if (conn->ping_timeout && !conn->recv_timeout) {
3053 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3054 "zero. Using 5 seconds\n.");
3055 conn->recv_timeout = 5;
3058 if (conn->recv_timeout && !conn->ping_timeout) {
3059 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3060 "zero. Using 5 seconds.\n");
3061 conn->ping_timeout = 5;
3064 spin_lock_bh(&session->frwd_lock);
3065 conn->c_stage = ISCSI_CONN_STARTED;
3066 session->state = ISCSI_STATE_LOGGED_IN;
3067 session->queued_cmdsn = session->cmdsn;
3069 conn->last_recv = jiffies;
3070 conn->last_ping = jiffies;
3071 if (conn->recv_timeout && conn->ping_timeout)
3072 mod_timer(&conn->transport_timer,
3073 jiffies + (conn->recv_timeout * HZ));
3075 switch(conn->stop_stage) {
3076 case STOP_CONN_RECOVER:
3078 * unblock eh_abort() if it is blocked. re-try all
3079 * commands after successful recovery
3081 conn->stop_stage = 0;
3082 conn->tmf_state = TMF_INITIAL;
3084 if (session->age == 16)
3087 case STOP_CONN_TERM:
3088 conn->stop_stage = 0;
3093 spin_unlock_bh(&session->frwd_lock);
3095 iscsi_unblock_session(session->cls_session);
3096 wake_up(&conn->ehwait);
3099 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3102 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3104 struct iscsi_task *task;
3107 for (i = 0; i < conn->session->cmds_max; i++) {
3108 task = conn->session->cmds[i];
3112 if (task->state == ISCSI_TASK_FREE)
3115 ISCSI_DBG_SESSION(conn->session,
3116 "failing mgmt itt 0x%x state %d\n",
3117 task->itt, task->state);
3118 state = ISCSI_TASK_ABRT_SESS_RECOV;
3119 if (task->state == ISCSI_TASK_PENDING)
3120 state = ISCSI_TASK_COMPLETED;
3121 iscsi_complete_task(task, state);
3126 static void iscsi_start_session_recovery(struct iscsi_session *session,
3127 struct iscsi_conn *conn, int flag)
3131 mutex_lock(&session->eh_mutex);
3132 spin_lock_bh(&session->frwd_lock);
3133 if (conn->stop_stage == STOP_CONN_TERM) {
3134 spin_unlock_bh(&session->frwd_lock);
3135 mutex_unlock(&session->eh_mutex);
3140 * When this is called for the in_login state, we only want to clean
3141 * up the login task and connection. We do not need to block and set
3142 * the recovery state again
3144 if (flag == STOP_CONN_TERM)
3145 session->state = ISCSI_STATE_TERMINATE;
3146 else if (conn->stop_stage != STOP_CONN_RECOVER)
3147 session->state = ISCSI_STATE_IN_RECOVERY;
3149 old_stop_stage = conn->stop_stage;
3150 conn->stop_stage = flag;
3151 spin_unlock_bh(&session->frwd_lock);
3153 del_timer_sync(&conn->transport_timer);
3154 iscsi_suspend_tx(conn);
3156 spin_lock_bh(&session->frwd_lock);
3157 conn->c_stage = ISCSI_CONN_STOPPED;
3158 spin_unlock_bh(&session->frwd_lock);
3161 * for connection level recovery we should not calculate
3162 * header digest. conn->hdr_size used for optimization
3163 * in hdr_extract() and will be re-negotiated at
3166 if (flag == STOP_CONN_RECOVER) {
3167 conn->hdrdgst_en = 0;
3168 conn->datadgst_en = 0;
3169 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3170 old_stop_stage != STOP_CONN_RECOVER) {
3171 ISCSI_DBG_SESSION(session, "blocking session\n");
3172 iscsi_block_session(session->cls_session);
3179 spin_lock_bh(&session->frwd_lock);
3180 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3181 fail_mgmt_tasks(session, conn);
3182 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3183 spin_unlock_bh(&session->frwd_lock);
3184 mutex_unlock(&session->eh_mutex);
3187 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3189 struct iscsi_conn *conn = cls_conn->dd_data;
3190 struct iscsi_session *session = conn->session;
3193 case STOP_CONN_RECOVER:
3194 case STOP_CONN_TERM:
3195 iscsi_start_session_recovery(session, conn, flag);
3198 iscsi_conn_printk(KERN_ERR, conn,
3199 "invalid stop flag %d\n", flag);
3202 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3204 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3205 struct iscsi_cls_conn *cls_conn, int is_leading)
3207 struct iscsi_session *session = cls_session->dd_data;
3208 struct iscsi_conn *conn = cls_conn->dd_data;
3210 spin_lock_bh(&session->frwd_lock);
3212 session->leadconn = conn;
3213 spin_unlock_bh(&session->frwd_lock);
3216 * Unblock xmitworker(), Login Phase will pass through.
3218 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3219 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3222 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3224 int iscsi_switch_str_param(char **param, char *new_val_buf)
3229 if (!strcmp(*param, new_val_buf))
3233 new_val = kstrdup(new_val_buf, GFP_NOIO);
3241 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3243 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3244 enum iscsi_param param, char *buf, int buflen)
3246 struct iscsi_conn *conn = cls_conn->dd_data;
3247 struct iscsi_session *session = conn->session;
3251 case ISCSI_PARAM_FAST_ABORT:
3252 sscanf(buf, "%d", &session->fast_abort);
3254 case ISCSI_PARAM_ABORT_TMO:
3255 sscanf(buf, "%d", &session->abort_timeout);
3257 case ISCSI_PARAM_LU_RESET_TMO:
3258 sscanf(buf, "%d", &session->lu_reset_timeout);
3260 case ISCSI_PARAM_TGT_RESET_TMO:
3261 sscanf(buf, "%d", &session->tgt_reset_timeout);
3263 case ISCSI_PARAM_PING_TMO:
3264 sscanf(buf, "%d", &conn->ping_timeout);
3266 case ISCSI_PARAM_RECV_TMO:
3267 sscanf(buf, "%d", &conn->recv_timeout);
3269 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3270 sscanf(buf, "%d", &conn->max_recv_dlength);
3272 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3273 sscanf(buf, "%d", &conn->max_xmit_dlength);
3275 case ISCSI_PARAM_HDRDGST_EN:
3276 sscanf(buf, "%d", &conn->hdrdgst_en);
3278 case ISCSI_PARAM_DATADGST_EN:
3279 sscanf(buf, "%d", &conn->datadgst_en);
3281 case ISCSI_PARAM_INITIAL_R2T_EN:
3282 sscanf(buf, "%d", &session->initial_r2t_en);
3284 case ISCSI_PARAM_MAX_R2T:
3285 sscanf(buf, "%hu", &session->max_r2t);
3287 case ISCSI_PARAM_IMM_DATA_EN:
3288 sscanf(buf, "%d", &session->imm_data_en);
3290 case ISCSI_PARAM_FIRST_BURST:
3291 sscanf(buf, "%d", &session->first_burst);
3293 case ISCSI_PARAM_MAX_BURST:
3294 sscanf(buf, "%d", &session->max_burst);
3296 case ISCSI_PARAM_PDU_INORDER_EN:
3297 sscanf(buf, "%d", &session->pdu_inorder_en);
3299 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3300 sscanf(buf, "%d", &session->dataseq_inorder_en);
3302 case ISCSI_PARAM_ERL:
3303 sscanf(buf, "%d", &session->erl);
3305 case ISCSI_PARAM_EXP_STATSN:
3306 sscanf(buf, "%u", &conn->exp_statsn);
3308 case ISCSI_PARAM_USERNAME:
3309 return iscsi_switch_str_param(&session->username, buf);
3310 case ISCSI_PARAM_USERNAME_IN:
3311 return iscsi_switch_str_param(&session->username_in, buf);
3312 case ISCSI_PARAM_PASSWORD:
3313 return iscsi_switch_str_param(&session->password, buf);
3314 case ISCSI_PARAM_PASSWORD_IN:
3315 return iscsi_switch_str_param(&session->password_in, buf);
3316 case ISCSI_PARAM_TARGET_NAME:
3317 return iscsi_switch_str_param(&session->targetname, buf);
3318 case ISCSI_PARAM_TARGET_ALIAS:
3319 return iscsi_switch_str_param(&session->targetalias, buf);
3320 case ISCSI_PARAM_TPGT:
3321 sscanf(buf, "%d", &session->tpgt);
3323 case ISCSI_PARAM_PERSISTENT_PORT:
3324 sscanf(buf, "%d", &conn->persistent_port);
3326 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3327 return iscsi_switch_str_param(&conn->persistent_address, buf);
3328 case ISCSI_PARAM_IFACE_NAME:
3329 return iscsi_switch_str_param(&session->ifacename, buf);
3330 case ISCSI_PARAM_INITIATOR_NAME:
3331 return iscsi_switch_str_param(&session->initiatorname, buf);
3332 case ISCSI_PARAM_BOOT_ROOT:
3333 return iscsi_switch_str_param(&session->boot_root, buf);
3334 case ISCSI_PARAM_BOOT_NIC:
3335 return iscsi_switch_str_param(&session->boot_nic, buf);
3336 case ISCSI_PARAM_BOOT_TARGET:
3337 return iscsi_switch_str_param(&session->boot_target, buf);
3338 case ISCSI_PARAM_PORTAL_TYPE:
3339 return iscsi_switch_str_param(&session->portal_type, buf);
3340 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3341 return iscsi_switch_str_param(&session->discovery_parent_type,
3343 case ISCSI_PARAM_DISCOVERY_SESS:
3344 sscanf(buf, "%d", &val);
3345 session->discovery_sess = !!val;
3347 case ISCSI_PARAM_LOCAL_IPADDR:
3348 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3355 EXPORT_SYMBOL_GPL(iscsi_set_param);
3357 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3358 enum iscsi_param param, char *buf)
3360 struct iscsi_session *session = cls_session->dd_data;
3364 case ISCSI_PARAM_FAST_ABORT:
3365 len = sysfs_emit(buf, "%d\n", session->fast_abort);
3367 case ISCSI_PARAM_ABORT_TMO:
3368 len = sysfs_emit(buf, "%d\n", session->abort_timeout);
3370 case ISCSI_PARAM_LU_RESET_TMO:
3371 len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout);
3373 case ISCSI_PARAM_TGT_RESET_TMO:
3374 len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout);
3376 case ISCSI_PARAM_INITIAL_R2T_EN:
3377 len = sysfs_emit(buf, "%d\n", session->initial_r2t_en);
3379 case ISCSI_PARAM_MAX_R2T:
3380 len = sysfs_emit(buf, "%hu\n", session->max_r2t);
3382 case ISCSI_PARAM_IMM_DATA_EN:
3383 len = sysfs_emit(buf, "%d\n", session->imm_data_en);
3385 case ISCSI_PARAM_FIRST_BURST:
3386 len = sysfs_emit(buf, "%u\n", session->first_burst);
3388 case ISCSI_PARAM_MAX_BURST:
3389 len = sysfs_emit(buf, "%u\n", session->max_burst);
3391 case ISCSI_PARAM_PDU_INORDER_EN:
3392 len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en);
3394 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3395 len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en);
3397 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3398 len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo);
3400 case ISCSI_PARAM_ERL:
3401 len = sysfs_emit(buf, "%d\n", session->erl);
3403 case ISCSI_PARAM_TARGET_NAME:
3404 len = sysfs_emit(buf, "%s\n", session->targetname);
3406 case ISCSI_PARAM_TARGET_ALIAS:
3407 len = sysfs_emit(buf, "%s\n", session->targetalias);
3409 case ISCSI_PARAM_TPGT:
3410 len = sysfs_emit(buf, "%d\n", session->tpgt);
3412 case ISCSI_PARAM_USERNAME:
3413 len = sysfs_emit(buf, "%s\n", session->username);
3415 case ISCSI_PARAM_USERNAME_IN:
3416 len = sysfs_emit(buf, "%s\n", session->username_in);
3418 case ISCSI_PARAM_PASSWORD:
3419 len = sysfs_emit(buf, "%s\n", session->password);
3421 case ISCSI_PARAM_PASSWORD_IN:
3422 len = sysfs_emit(buf, "%s\n", session->password_in);
3424 case ISCSI_PARAM_IFACE_NAME:
3425 len = sysfs_emit(buf, "%s\n", session->ifacename);
3427 case ISCSI_PARAM_INITIATOR_NAME:
3428 len = sysfs_emit(buf, "%s\n", session->initiatorname);
3430 case ISCSI_PARAM_BOOT_ROOT:
3431 len = sysfs_emit(buf, "%s\n", session->boot_root);
3433 case ISCSI_PARAM_BOOT_NIC:
3434 len = sysfs_emit(buf, "%s\n", session->boot_nic);
3436 case ISCSI_PARAM_BOOT_TARGET:
3437 len = sysfs_emit(buf, "%s\n", session->boot_target);
3439 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3440 len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable);
3442 case ISCSI_PARAM_DISCOVERY_SESS:
3443 len = sysfs_emit(buf, "%u\n", session->discovery_sess);
3445 case ISCSI_PARAM_PORTAL_TYPE:
3446 len = sysfs_emit(buf, "%s\n", session->portal_type);
3448 case ISCSI_PARAM_CHAP_AUTH_EN:
3449 len = sysfs_emit(buf, "%u\n", session->chap_auth_en);
3451 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3452 len = sysfs_emit(buf, "%u\n", session->discovery_logout_en);
3454 case ISCSI_PARAM_BIDI_CHAP_EN:
3455 len = sysfs_emit(buf, "%u\n", session->bidi_chap_en);
3457 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3458 len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional);
3460 case ISCSI_PARAM_DEF_TIME2WAIT:
3461 len = sysfs_emit(buf, "%d\n", session->time2wait);
3463 case ISCSI_PARAM_DEF_TIME2RETAIN:
3464 len = sysfs_emit(buf, "%d\n", session->time2retain);
3466 case ISCSI_PARAM_TSID:
3467 len = sysfs_emit(buf, "%u\n", session->tsid);
3469 case ISCSI_PARAM_ISID:
3470 len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n",
3471 session->isid[0], session->isid[1],
3472 session->isid[2], session->isid[3],
3473 session->isid[4], session->isid[5]);
3475 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3476 len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx);
3478 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3479 if (session->discovery_parent_type)
3480 len = sysfs_emit(buf, "%s\n",
3481 session->discovery_parent_type);
3483 len = sysfs_emit(buf, "\n");
3491 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3493 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3494 enum iscsi_param param, char *buf)
3496 struct sockaddr_in6 *sin6 = NULL;
3497 struct sockaddr_in *sin = NULL;
3500 switch (addr->ss_family) {
3502 sin = (struct sockaddr_in *)addr;
3505 sin6 = (struct sockaddr_in6 *)addr;
3512 case ISCSI_PARAM_CONN_ADDRESS:
3513 case ISCSI_HOST_PARAM_IPADDRESS:
3515 len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr);
3517 len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr);
3519 case ISCSI_PARAM_CONN_PORT:
3520 case ISCSI_PARAM_LOCAL_PORT:
3522 len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3524 len = sysfs_emit(buf, "%hu\n",
3525 be16_to_cpu(sin6->sin6_port));
3533 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3535 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3536 enum iscsi_param param, char *buf)
3538 struct iscsi_conn *conn = cls_conn->dd_data;
3542 case ISCSI_PARAM_PING_TMO:
3543 len = sysfs_emit(buf, "%u\n", conn->ping_timeout);
3545 case ISCSI_PARAM_RECV_TMO:
3546 len = sysfs_emit(buf, "%u\n", conn->recv_timeout);
3548 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3549 len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength);
3551 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3552 len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength);
3554 case ISCSI_PARAM_HDRDGST_EN:
3555 len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en);
3557 case ISCSI_PARAM_DATADGST_EN:
3558 len = sysfs_emit(buf, "%d\n", conn->datadgst_en);
3560 case ISCSI_PARAM_IFMARKER_EN:
3561 len = sysfs_emit(buf, "%d\n", conn->ifmarker_en);
3563 case ISCSI_PARAM_OFMARKER_EN:
3564 len = sysfs_emit(buf, "%d\n", conn->ofmarker_en);
3566 case ISCSI_PARAM_EXP_STATSN:
3567 len = sysfs_emit(buf, "%u\n", conn->exp_statsn);
3569 case ISCSI_PARAM_PERSISTENT_PORT:
3570 len = sysfs_emit(buf, "%d\n", conn->persistent_port);
3572 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3573 len = sysfs_emit(buf, "%s\n", conn->persistent_address);
3575 case ISCSI_PARAM_STATSN:
3576 len = sysfs_emit(buf, "%u\n", conn->statsn);
3578 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3579 len = sysfs_emit(buf, "%u\n", conn->max_segment_size);
3581 case ISCSI_PARAM_KEEPALIVE_TMO:
3582 len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo);
3584 case ISCSI_PARAM_LOCAL_PORT:
3585 len = sysfs_emit(buf, "%u\n", conn->local_port);
3587 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3588 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat);
3590 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3591 len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable);
3593 case ISCSI_PARAM_TCP_WSF_DISABLE:
3594 len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable);
3596 case ISCSI_PARAM_TCP_TIMER_SCALE:
3597 len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale);
3599 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3600 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en);
3602 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3603 len = sysfs_emit(buf, "%u\n", conn->fragment_disable);
3605 case ISCSI_PARAM_IPV4_TOS:
3606 len = sysfs_emit(buf, "%u\n", conn->ipv4_tos);
3608 case ISCSI_PARAM_IPV6_TC:
3609 len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class);
3611 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3612 len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label);
3614 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3615 len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6);
3617 case ISCSI_PARAM_TCP_XMIT_WSF:
3618 len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf);
3620 case ISCSI_PARAM_TCP_RECV_WSF:
3621 len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf);
3623 case ISCSI_PARAM_LOCAL_IPADDR:
3624 len = sysfs_emit(buf, "%s\n", conn->local_ipaddr);
3632 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3634 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3637 struct iscsi_host *ihost = shost_priv(shost);
3641 case ISCSI_HOST_PARAM_NETDEV_NAME:
3642 len = sysfs_emit(buf, "%s\n", ihost->netdev);
3644 case ISCSI_HOST_PARAM_HWADDRESS:
3645 len = sysfs_emit(buf, "%s\n", ihost->hwaddress);
3647 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3648 len = sysfs_emit(buf, "%s\n", ihost->initiatorname);
3656 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3658 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3659 char *buf, int buflen)
3661 struct iscsi_host *ihost = shost_priv(shost);
3664 case ISCSI_HOST_PARAM_NETDEV_NAME:
3665 return iscsi_switch_str_param(&ihost->netdev, buf);
3666 case ISCSI_HOST_PARAM_HWADDRESS:
3667 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3668 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3669 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3676 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3678 MODULE_AUTHOR("Mike Christie");
3679 MODULE_DESCRIPTION("iSCSI library functions");
3680 MODULE_LICENSE("GPL");