4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <linux/slab.h>
29 #include <linux/sched/signal.h>
30 #include <linux/module.h>
31 #include <asm/unaligned.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_eh.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi.h>
39 #include <scsi/iscsi_proto.h>
40 #include <scsi/scsi_transport.h>
41 #include <scsi/scsi_transport_iscsi.h>
42 #include <scsi/libiscsi.h>
44 static int iscsi_dbg_lib_conn;
45 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
47 MODULE_PARM_DESC(debug_libiscsi_conn,
48 "Turn on debugging for connections in libiscsi module. "
49 "Set to 1 to turn on, and zero to turn off. Default is off.");
51 static int iscsi_dbg_lib_session;
52 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
54 MODULE_PARM_DESC(debug_libiscsi_session,
55 "Turn on debugging for sessions in libiscsi module. "
56 "Set to 1 to turn on, and zero to turn off. Default is off.");
58 static int iscsi_dbg_lib_eh;
59 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
61 MODULE_PARM_DESC(debug_libiscsi_eh,
62 "Turn on debugging for error handling in libiscsi module. "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
65 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
67 if (iscsi_dbg_lib_conn) \
68 iscsi_conn_printk(KERN_INFO, _conn, \
73 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
75 if (iscsi_dbg_lib_session) \
76 iscsi_session_printk(KERN_INFO, _session, \
81 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
83 if (iscsi_dbg_lib_eh) \
84 iscsi_session_printk(KERN_INFO, _session, \
89 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
91 struct Scsi_Host *shost = conn->session->host;
92 struct iscsi_host *ihost = shost_priv(shost);
95 queue_work(ihost->workq, &conn->xmitwork);
97 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
99 static void __iscsi_update_cmdsn(struct iscsi_session *session,
100 uint32_t exp_cmdsn, uint32_t max_cmdsn)
103 * standard specifies this check for when to update expected and
104 * max sequence numbers
106 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
109 if (exp_cmdsn != session->exp_cmdsn &&
110 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
111 session->exp_cmdsn = exp_cmdsn;
113 if (max_cmdsn != session->max_cmdsn &&
114 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
115 session->max_cmdsn = max_cmdsn;
118 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
120 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
121 be32_to_cpu(hdr->max_cmdsn));
123 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
126 * iscsi_prep_data_out_pdu - initialize Data-Out
127 * @task: scsi command task
129 * @hdr: iscsi data in pdu
132 * Initialize Data-Out within this R2T sequence and finds
133 * proper data_offset within this SCSI command.
135 * This function is called with connection lock taken.
137 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
138 struct iscsi_data *hdr)
140 struct iscsi_conn *conn = task->conn;
141 unsigned int left = r2t->data_length - r2t->sent;
143 task->hdr_len = sizeof(struct iscsi_data);
145 memset(hdr, 0, sizeof(struct iscsi_data));
147 hdr->datasn = cpu_to_be32(r2t->datasn);
149 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
150 hdr->lun = task->lun;
151 hdr->itt = task->hdr_itt;
152 hdr->exp_statsn = r2t->exp_statsn;
153 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
154 if (left > conn->max_xmit_dlength) {
155 hton24(hdr->dlength, conn->max_xmit_dlength);
156 r2t->data_count = conn->max_xmit_dlength;
159 hton24(hdr->dlength, left);
160 r2t->data_count = left;
161 hdr->flags = ISCSI_FLAG_CMD_FINAL;
163 conn->dataout_pdus_cnt++;
165 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
167 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
169 unsigned exp_len = task->hdr_len + len;
171 if (exp_len > task->hdr_max) {
176 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
177 task->hdr_len = exp_len;
182 * make an extended cdb AHS
184 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
186 struct scsi_cmnd *cmd = task->sc;
187 unsigned rlen, pad_len;
188 unsigned short ahslength;
189 struct iscsi_ecdb_ahdr *ecdb_ahdr;
192 ecdb_ahdr = iscsi_next_hdr(task);
193 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
195 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
196 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
198 pad_len = iscsi_padding(rlen);
200 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
201 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
206 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
208 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
209 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
210 ecdb_ahdr->reserved = 0;
211 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
213 ISCSI_DBG_SESSION(task->conn->session,
214 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
215 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
216 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
221 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
223 struct scsi_cmnd *sc = task->sc;
224 struct iscsi_rlength_ahdr *rlen_ahdr;
227 rlen_ahdr = iscsi_next_hdr(task);
228 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
232 rlen_ahdr->ahslength =
233 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
234 sizeof(rlen_ahdr->reserved));
235 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
236 rlen_ahdr->reserved = 0;
237 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
239 ISCSI_DBG_SESSION(task->conn->session,
240 "bidi-in rlen_ahdr->read_length(%d) "
241 "rlen_ahdr->ahslength(%d)\n",
242 be32_to_cpu(rlen_ahdr->read_length),
243 be16_to_cpu(rlen_ahdr->ahslength));
248 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
250 * @opcode: opcode to check for
252 * During TMF a task has to be checked if it's affected.
253 * All unrelated I/O can be passed through, but I/O to the
254 * affected LUN should be restricted.
255 * If 'fast_abort' is set we won't be sending any I/O to the
257 * Otherwise the target is waiting for all TTTs to be completed,
258 * so we have to send all outstanding Data-Out PDUs to the target.
260 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
262 struct iscsi_conn *conn = task->conn;
263 struct iscsi_tm *tmf = &conn->tmhdr;
266 if (conn->tmf_state == TMF_INITIAL)
269 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
272 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
273 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
275 * Allow PDUs for unrelated LUNs
277 hdr_lun = scsilun_to_int(&tmf->lun);
278 if (hdr_lun != task->sc->device->lun)
281 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
283 * Fail all SCSI cmd PDUs
285 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
286 iscsi_conn_printk(KERN_INFO, conn,
295 * And also all data-out PDUs in response to R2T
296 * if fast_abort is set.
298 if (conn->session->fast_abort) {
299 iscsi_conn_printk(KERN_INFO, conn,
301 "0x%x/0x%x] fast abort.\n",
307 case ISCSI_TM_FUNC_ABORT_TASK:
309 * the caller has already checked if the task
310 * they want to abort was in the pending queue so if
311 * we are here the cmd pdu has gone out already, and
312 * we will only hit this for data-outs
314 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
315 task->hdr_itt == tmf->rtt) {
316 ISCSI_DBG_SESSION(conn->session,
317 "Preventing task %x/%x from sending "
318 "data-out due to abort task in "
319 "progress\n", task->itt,
330 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
333 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
334 * fields like dlength or final based on how much data it sends
336 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
338 struct iscsi_conn *conn = task->conn;
339 struct iscsi_session *session = conn->session;
340 struct scsi_cmnd *sc = task->sc;
341 struct iscsi_scsi_req *hdr;
342 unsigned hdrlength, cmd_len, transfer_length;
346 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
350 if (conn->session->tt->alloc_pdu) {
351 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
355 hdr = (struct iscsi_scsi_req *)task->hdr;
357 memset(hdr, 0, sizeof(*hdr));
359 if (session->tt->parse_pdu_itt)
360 hdr->itt = task->hdr_itt = itt;
362 hdr->itt = task->hdr_itt = build_itt(task->itt,
363 task->conn->session->age);
365 rc = iscsi_add_hdr(task, sizeof(*hdr));
368 hdr->opcode = ISCSI_OP_SCSI_CMD;
369 hdr->flags = ISCSI_ATTR_SIMPLE;
370 int_to_scsilun(sc->device->lun, &hdr->lun);
371 task->lun = hdr->lun;
372 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
373 cmd_len = sc->cmd_len;
374 if (cmd_len < ISCSI_CDB_SIZE)
375 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
376 else if (cmd_len > ISCSI_CDB_SIZE) {
377 rc = iscsi_prep_ecdb_ahs(task);
380 cmd_len = ISCSI_CDB_SIZE;
382 memcpy(hdr->cdb, sc->cmnd, cmd_len);
385 if (scsi_bidi_cmnd(sc)) {
386 hdr->flags |= ISCSI_FLAG_CMD_READ;
387 rc = iscsi_prep_bidi_ahs(task);
392 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
393 task->protected = true;
395 transfer_length = scsi_transfer_length(sc);
396 hdr->data_length = cpu_to_be32(transfer_length);
397 if (sc->sc_data_direction == DMA_TO_DEVICE) {
398 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
400 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
404 * imm_count bytes to be sent right after
407 * unsol_count bytes(as Data-Out) to be sent
408 * without R2T ack right after
411 * r2t data_length bytes to be sent via R2T ack's
413 * pad_count bytes to be sent as zero-padding
415 memset(r2t, 0, sizeof(*r2t));
417 if (session->imm_data_en) {
418 if (transfer_length >= session->first_burst)
419 task->imm_count = min(session->first_burst,
420 conn->max_xmit_dlength);
422 task->imm_count = min(transfer_length,
423 conn->max_xmit_dlength);
424 hton24(hdr->dlength, task->imm_count);
426 zero_data(hdr->dlength);
428 if (!session->initial_r2t_en) {
429 r2t->data_length = min(session->first_burst,
432 r2t->data_offset = task->imm_count;
433 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
434 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
437 if (!task->unsol_r2t.data_length)
438 /* No unsolicit Data-Out's */
439 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 zero_data(hdr->dlength);
444 if (sc->sc_data_direction == DMA_FROM_DEVICE)
445 hdr->flags |= ISCSI_FLAG_CMD_READ;
448 /* calculate size of additional header segments (AHSs) */
449 hdrlength = task->hdr_len - sizeof(*hdr);
451 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
452 hdrlength /= ISCSI_PAD_LEN;
454 WARN_ON(hdrlength >= 256);
455 hdr->hlength = hdrlength & 0xFF;
456 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
458 if (session->tt->init_task && session->tt->init_task(task))
461 task->state = ISCSI_TASK_RUNNING;
464 conn->scsicmd_pdus_cnt++;
465 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
466 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
467 scsi_bidi_cmnd(sc) ? "bidirectional" :
468 sc->sc_data_direction == DMA_TO_DEVICE ?
469 "write" : "read", conn->id, sc, sc->cmnd[0],
470 task->itt, transfer_length,
471 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
473 session->max_cmdsn - session->exp_cmdsn + 1);
478 * iscsi_free_task - free a task
479 * @task: iscsi cmd task
481 * Must be called with session back_lock.
482 * This function returns the scsi command to scsi-ml or cleans
483 * up mgmt tasks then returns the task to the pool.
485 static void iscsi_free_task(struct iscsi_task *task)
487 struct iscsi_conn *conn = task->conn;
488 struct iscsi_session *session = conn->session;
489 struct scsi_cmnd *sc = task->sc;
490 int oldstate = task->state;
492 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
493 task->itt, task->state, task->sc);
495 session->tt->cleanup_task(task);
496 task->state = ISCSI_TASK_FREE;
499 * login task is preallocated so do not free
501 if (conn->login_task == task)
504 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
507 /* SCSI eh reuses commands to verify us */
510 * queue command may call this to free the task, so
511 * it will decide how to return sc to scsi-ml.
513 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
518 void __iscsi_get_task(struct iscsi_task *task)
520 refcount_inc(&task->refcount);
522 EXPORT_SYMBOL_GPL(__iscsi_get_task);
524 void __iscsi_put_task(struct iscsi_task *task)
526 if (refcount_dec_and_test(&task->refcount))
527 iscsi_free_task(task);
529 EXPORT_SYMBOL_GPL(__iscsi_put_task);
531 void iscsi_put_task(struct iscsi_task *task)
533 struct iscsi_session *session = task->conn->session;
535 /* regular RX path uses back_lock */
536 spin_lock_bh(&session->back_lock);
537 __iscsi_put_task(task);
538 spin_unlock_bh(&session->back_lock);
540 EXPORT_SYMBOL_GPL(iscsi_put_task);
543 * iscsi_complete_task - finish a task
544 * @task: iscsi cmd task
545 * @state: state to complete task with
547 * Must be called with session back_lock.
549 static void iscsi_complete_task(struct iscsi_task *task, int state)
551 struct iscsi_conn *conn = task->conn;
553 ISCSI_DBG_SESSION(conn->session,
554 "complete task itt 0x%x state %d sc %p\n",
555 task->itt, task->state, task->sc);
556 if (task->state == ISCSI_TASK_COMPLETED ||
557 task->state == ISCSI_TASK_ABRT_TMF ||
558 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
559 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
561 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
564 spin_lock_bh(&conn->taskqueuelock);
565 if (!list_empty(&task->running)) {
566 pr_debug_once("%s while task on list", __func__);
567 list_del_init(&task->running);
569 spin_unlock_bh(&conn->taskqueuelock);
571 if (conn->task == task)
574 if (READ_ONCE(conn->ping_task) == task)
575 WRITE_ONCE(conn->ping_task, NULL);
577 /* release get from queueing */
578 __iscsi_put_task(task);
582 * iscsi_complete_scsi_task - finish scsi task normally
583 * @task: iscsi task for scsi cmd
584 * @exp_cmdsn: expected cmd sn in cpu format
585 * @max_cmdsn: max cmd sn in cpu format
587 * This is used when drivers do not need or cannot perform
588 * lower level pdu processing.
590 * Called with session back_lock
592 void iscsi_complete_scsi_task(struct iscsi_task *task,
593 uint32_t exp_cmdsn, uint32_t max_cmdsn)
595 struct iscsi_conn *conn = task->conn;
597 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
599 conn->last_recv = jiffies;
600 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
601 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
603 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
607 * session back_lock must be held and if not called for a task that is
608 * still pending or from the xmit thread, then xmit thread must
611 static void fail_scsi_task(struct iscsi_task *task, int err)
613 struct iscsi_conn *conn = task->conn;
614 struct scsi_cmnd *sc;
618 * if a command completes and we get a successful tmf response
619 * we will hit this because the scsi eh abort code does not take
626 if (task->state == ISCSI_TASK_PENDING) {
628 * cmd never made it to the xmit thread, so we should not count
629 * the cmd in the sequencing
631 conn->session->queued_cmdsn--;
632 /* it was never sent so just complete like normal */
633 state = ISCSI_TASK_COMPLETED;
634 } else if (err == DID_TRANSPORT_DISRUPTED)
635 state = ISCSI_TASK_ABRT_SESS_RECOV;
637 state = ISCSI_TASK_ABRT_TMF;
639 sc->result = err << 16;
640 if (!scsi_bidi_cmnd(sc))
641 scsi_set_resid(sc, scsi_bufflen(sc));
643 scsi_out(sc)->resid = scsi_out(sc)->length;
644 scsi_in(sc)->resid = scsi_in(sc)->length;
647 /* regular RX path uses back_lock */
648 spin_lock_bh(&conn->session->back_lock);
649 iscsi_complete_task(task, state);
650 spin_unlock_bh(&conn->session->back_lock);
653 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
654 struct iscsi_task *task)
656 struct iscsi_session *session = conn->session;
657 struct iscsi_hdr *hdr = task->hdr;
658 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
659 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
661 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
664 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
665 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
667 * pre-format CmdSN for outgoing PDU.
669 nop->cmdsn = cpu_to_be32(session->cmdsn);
670 if (hdr->itt != RESERVED_ITT) {
672 * TODO: We always use immediate for normal session pdus.
673 * If we start to send tmfs or nops as non-immediate then
674 * we should start checking the cmdsn numbers for mgmt tasks.
676 * During discovery sessions iscsid sends TEXT as non immediate,
677 * but we always only send one PDU at a time.
679 if (conn->c_stage == ISCSI_CONN_STARTED &&
680 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
681 session->queued_cmdsn++;
686 if (session->tt->init_task && session->tt->init_task(task))
689 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
690 session->state = ISCSI_STATE_LOGGING_OUT;
692 task->state = ISCSI_TASK_RUNNING;
693 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
694 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
695 hdr->itt, task->data_count);
699 static struct iscsi_task *
700 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
701 char *data, uint32_t data_size)
703 struct iscsi_session *session = conn->session;
704 struct iscsi_host *ihost = shost_priv(session->host);
705 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
706 struct iscsi_task *task;
709 if (session->state == ISCSI_STATE_TERMINATE)
712 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
714 * Login and Text are sent serially, in
715 * request-followed-by-response sequence.
716 * Same task can be used. Same ITT must be used.
717 * Note that login_task is preallocated at conn_create().
719 if (conn->login_task->state != ISCSI_TASK_FREE) {
720 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
721 "progress. Cannot start new task.\n");
725 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
726 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);
730 task = conn->login_task;
732 if (session->state != ISCSI_STATE_LOGGED_IN)
735 if (data_size != 0) {
736 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
740 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
741 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
743 if (!kfifo_out(&session->cmdpool.queue,
744 (void*)&task, sizeof(void*)))
748 * released in complete pdu for task we expect a response for, and
749 * released by the lld when it has transmitted the task for
750 * pdus we do not expect a response for.
752 refcount_set(&task->refcount, 1);
755 INIT_LIST_HEAD(&task->running);
756 task->state = ISCSI_TASK_PENDING;
759 memcpy(task->data, data, data_size);
760 task->data_count = data_size;
762 task->data_count = 0;
764 if (conn->session->tt->alloc_pdu) {
765 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
766 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
767 "pdu for mgmt task.\n");
772 itt = task->hdr->itt;
773 task->hdr_len = sizeof(struct iscsi_hdr);
774 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
776 if (hdr->itt != RESERVED_ITT) {
777 if (session->tt->parse_pdu_itt)
778 task->hdr->itt = itt;
780 task->hdr->itt = build_itt(task->itt,
781 task->conn->session->age);
784 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK))
785 WRITE_ONCE(conn->ping_task, task);
788 if (iscsi_prep_mgmt_task(conn, task))
791 if (session->tt->xmit_task(task))
794 spin_lock_bh(&conn->taskqueuelock);
795 list_add_tail(&task->running, &conn->mgmtqueue);
796 spin_unlock_bh(&conn->taskqueuelock);
797 iscsi_conn_queue_work(conn);
803 /* regular RX path uses back_lock */
804 spin_lock(&session->back_lock);
805 __iscsi_put_task(task);
806 spin_unlock(&session->back_lock);
810 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
811 char *data, uint32_t data_size)
813 struct iscsi_conn *conn = cls_conn->dd_data;
814 struct iscsi_session *session = conn->session;
817 spin_lock_bh(&session->frwd_lock);
818 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
820 spin_unlock_bh(&session->frwd_lock);
823 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
826 * iscsi_cmd_rsp - SCSI Command Response processing
827 * @conn: iscsi connection
829 * @task: scsi command task
830 * @data: cmd data buffer
831 * @datalen: len of buffer
833 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
834 * then completes the command and task.
836 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
837 struct iscsi_task *task, char *data,
840 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
841 struct iscsi_session *session = conn->session;
842 struct scsi_cmnd *sc = task->sc;
844 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
845 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
847 sc->result = (DID_OK << 16) | rhdr->cmd_status;
849 if (task->protected) {
854 * Transports that didn't implement check_protection
855 * callback but still published T10-PI support to scsi-mid
856 * deserve this BUG_ON.
858 BUG_ON(!session->tt->check_protection);
860 ascq = session->tt->check_protection(task, §or);
862 sc->result = DRIVER_SENSE << 24 |
863 SAM_STAT_CHECK_CONDITION;
864 scsi_build_sense_buffer(1, sc->sense_buffer,
865 ILLEGAL_REQUEST, 0x10, ascq);
866 scsi_set_sense_information(sc->sense_buffer,
867 SCSI_SENSE_BUFFERSIZE,
873 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
874 sc->result = DID_ERROR << 16;
878 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
883 iscsi_conn_printk(KERN_ERR, conn,
884 "Got CHECK_CONDITION but invalid data "
885 "buffer size of %d\n", datalen);
886 sc->result = DID_BAD_TARGET << 16;
890 senselen = get_unaligned_be16(data);
891 if (datalen < senselen)
892 goto invalid_datalen;
894 memcpy(sc->sense_buffer, data + 2,
895 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
896 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
897 min_t(uint16_t, senselen,
898 SCSI_SENSE_BUFFERSIZE));
901 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
902 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
903 int res_count = be32_to_cpu(rhdr->bi_residual_count);
905 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
906 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
907 res_count <= scsi_in(sc)->length))
908 scsi_in(sc)->resid = res_count;
910 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
913 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
914 ISCSI_FLAG_CMD_OVERFLOW)) {
915 int res_count = be32_to_cpu(rhdr->residual_count);
918 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
919 res_count <= scsi_bufflen(sc)))
920 /* write side for bidi or uni-io set_resid */
921 scsi_set_resid(sc, res_count);
923 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
926 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
927 sc, sc->result, task->itt);
928 conn->scsirsp_pdus_cnt++;
929 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
933 * iscsi_data_in_rsp - SCSI Data-In Response processing
934 * @conn: iscsi connection
936 * @task: scsi command task
939 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
940 struct iscsi_task *task)
942 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
943 struct scsi_cmnd *sc = task->sc;
945 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
948 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
949 sc->result = (DID_OK << 16) | rhdr->cmd_status;
950 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
951 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
952 ISCSI_FLAG_DATA_OVERFLOW)) {
953 int res_count = be32_to_cpu(rhdr->residual_count);
956 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
957 res_count <= scsi_in(sc)->length))
958 scsi_in(sc)->resid = res_count;
960 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
963 ISCSI_DBG_SESSION(conn->session, "data in with status done "
964 "[sc %p res %d itt 0x%x]\n",
965 sc, sc->result, task->itt);
966 conn->scsirsp_pdus_cnt++;
967 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
970 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
972 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
974 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
975 conn->tmfrsp_pdus_cnt++;
977 if (conn->tmf_state != TMF_QUEUED)
980 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
981 conn->tmf_state = TMF_SUCCESS;
982 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
983 conn->tmf_state = TMF_NOT_FOUND;
985 conn->tmf_state = TMF_FAILED;
986 wake_up(&conn->ehwait);
989 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
991 struct iscsi_nopout hdr;
992 struct iscsi_task *task;
995 if (READ_ONCE(conn->ping_task))
997 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK);
1000 memset(&hdr, 0, sizeof(struct iscsi_nopout));
1001 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
1002 hdr.flags = ISCSI_FLAG_CMD_FINAL;
1005 hdr.lun = rhdr->lun;
1006 hdr.ttt = rhdr->ttt;
1007 hdr.itt = RESERVED_ITT;
1009 hdr.ttt = RESERVED_ITT;
1011 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
1014 WRITE_ONCE(conn->ping_task, NULL);
1015 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1018 /* only track our nops */
1019 conn->last_ping = jiffies;
1025 static int iscsi_nop_out_rsp(struct iscsi_task *task,
1026 struct iscsi_nopin *nop, char *data, int datalen)
1028 struct iscsi_conn *conn = task->conn;
1031 if (READ_ONCE(conn->ping_task) != task) {
1033 * If this is not in response to one of our
1034 * nops then it must be from userspace.
1036 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1038 rc = ISCSI_ERR_CONN_FAILED;
1040 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1041 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1045 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1046 char *data, int datalen)
1048 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1049 struct iscsi_hdr rejected_pdu;
1052 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1054 if (ntoh24(reject->dlength) > datalen ||
1055 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1056 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1057 "pdu. Invalid data length (pdu dlength "
1058 "%u, datalen %d\n", ntoh24(reject->dlength),
1060 return ISCSI_ERR_PROTO;
1062 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1063 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1065 switch (reject->reason) {
1066 case ISCSI_REASON_DATA_DIGEST_ERROR:
1067 iscsi_conn_printk(KERN_ERR, conn,
1068 "pdu (op 0x%x itt 0x%x) rejected "
1069 "due to DataDigest error.\n",
1070 opcode, rejected_pdu.itt);
1072 case ISCSI_REASON_IMM_CMD_REJECT:
1073 iscsi_conn_printk(KERN_ERR, conn,
1074 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1075 "immediate commands.\n",
1076 opcode, rejected_pdu.itt);
1078 * We only send one TMF at a time so if the target could not
1079 * handle it, then it should get fixed (RFC mandates that
1080 * a target can handle one immediate TMF per conn).
1082 * For nops-outs, we could have sent more than one if
1083 * the target is sending us lots of nop-ins
1085 if (opcode != ISCSI_OP_NOOP_OUT)
1088 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1090 * nop-out in response to target's nop-out rejected.
1093 /* In RX path we are under back lock */
1094 spin_unlock(&conn->session->back_lock);
1095 spin_lock(&conn->session->frwd_lock);
1096 iscsi_send_nopout(conn,
1097 (struct iscsi_nopin*)&rejected_pdu);
1098 spin_unlock(&conn->session->frwd_lock);
1099 spin_lock(&conn->session->back_lock);
1101 struct iscsi_task *task;
1103 * Our nop as ping got dropped. We know the target
1104 * and transport are ok so just clean up
1106 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1108 iscsi_conn_printk(KERN_ERR, conn,
1109 "Invalid pdu reject. Could "
1110 "not lookup rejected task.\n");
1111 rc = ISCSI_ERR_BAD_ITT;
1113 rc = iscsi_nop_out_rsp(task,
1114 (struct iscsi_nopin*)&rejected_pdu,
1119 iscsi_conn_printk(KERN_ERR, conn,
1120 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1121 "code 0x%x\n", rejected_pdu.opcode,
1122 rejected_pdu.itt, reject->reason);
1129 * iscsi_itt_to_task - look up task by itt
1130 * @conn: iscsi connection
1133 * This should be used for mgmt tasks like login and nops, or if
1134 * the LDD's itt space does not include the session age.
1136 * The session back_lock must be held.
1138 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1140 struct iscsi_session *session = conn->session;
1143 if (itt == RESERVED_ITT)
1146 if (session->tt->parse_pdu_itt)
1147 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1150 if (i >= session->cmds_max)
1153 return session->cmds[i];
1155 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1158 * __iscsi_complete_pdu - complete pdu
1160 * @hdr: iscsi header
1161 * @data: data buffer
1162 * @datalen: len of data buffer
1164 * Completes pdu processing by freeing any resources allocated at
1165 * queuecommand or send generic. session back_lock must be held and verify
1166 * itt must have been called.
1168 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1169 char *data, int datalen)
1171 struct iscsi_session *session = conn->session;
1172 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1173 struct iscsi_task *task;
1176 conn->last_recv = jiffies;
1177 rc = iscsi_verify_itt(conn, hdr->itt);
1181 if (hdr->itt != RESERVED_ITT)
1182 itt = get_itt(hdr->itt);
1186 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1187 opcode, conn->id, itt, datalen);
1190 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1193 case ISCSI_OP_NOOP_IN:
1195 rc = ISCSI_ERR_PROTO;
1199 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1202 /* In RX path we are under back lock */
1203 spin_unlock(&session->back_lock);
1204 spin_lock(&session->frwd_lock);
1205 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1206 spin_unlock(&session->frwd_lock);
1207 spin_lock(&session->back_lock);
1209 case ISCSI_OP_REJECT:
1210 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1212 case ISCSI_OP_ASYNC_EVENT:
1213 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1214 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1215 rc = ISCSI_ERR_CONN_FAILED;
1218 rc = ISCSI_ERR_BAD_OPCODE;
1225 case ISCSI_OP_SCSI_CMD_RSP:
1226 case ISCSI_OP_SCSI_DATA_IN:
1227 task = iscsi_itt_to_ctask(conn, hdr->itt);
1229 return ISCSI_ERR_BAD_ITT;
1230 task->last_xfer = jiffies;
1234 * LLD handles R2Ts if they need to.
1237 case ISCSI_OP_LOGOUT_RSP:
1238 case ISCSI_OP_LOGIN_RSP:
1239 case ISCSI_OP_TEXT_RSP:
1240 case ISCSI_OP_SCSI_TMFUNC_RSP:
1241 case ISCSI_OP_NOOP_IN:
1242 task = iscsi_itt_to_task(conn, hdr->itt);
1244 return ISCSI_ERR_BAD_ITT;
1247 return ISCSI_ERR_BAD_OPCODE;
1251 case ISCSI_OP_SCSI_CMD_RSP:
1252 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1254 case ISCSI_OP_SCSI_DATA_IN:
1255 iscsi_data_in_rsp(conn, hdr, task);
1257 case ISCSI_OP_LOGOUT_RSP:
1258 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1260 rc = ISCSI_ERR_PROTO;
1263 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1265 case ISCSI_OP_LOGIN_RSP:
1266 case ISCSI_OP_TEXT_RSP:
1267 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1269 * login related PDU's exp_statsn is handled in
1273 case ISCSI_OP_SCSI_TMFUNC_RSP:
1274 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1276 rc = ISCSI_ERR_PROTO;
1280 iscsi_tmf_rsp(conn, hdr);
1281 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1283 case ISCSI_OP_NOOP_IN:
1284 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1285 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1286 rc = ISCSI_ERR_PROTO;
1289 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1291 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1295 rc = ISCSI_ERR_BAD_OPCODE;
1302 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1303 rc = ISCSI_ERR_CONN_FAILED;
1304 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1307 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1309 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1310 char *data, int datalen)
1314 spin_lock(&conn->session->back_lock);
1315 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1316 spin_unlock(&conn->session->back_lock);
1319 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1321 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1323 struct iscsi_session *session = conn->session;
1326 if (itt == RESERVED_ITT)
1329 if (session->tt->parse_pdu_itt)
1330 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1333 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1336 if (age != session->age) {
1337 iscsi_conn_printk(KERN_ERR, conn,
1338 "received itt %x expected session age (%x)\n",
1339 (__force u32)itt, session->age);
1340 return ISCSI_ERR_BAD_ITT;
1343 if (i >= session->cmds_max) {
1344 iscsi_conn_printk(KERN_ERR, conn,
1345 "received invalid itt index %u (max cmds "
1346 "%u.\n", i, session->cmds_max);
1347 return ISCSI_ERR_BAD_ITT;
1351 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1354 * iscsi_itt_to_ctask - look up ctask by itt
1355 * @conn: iscsi connection
1358 * This should be used for cmd tasks.
1360 * The session back_lock must be held.
1362 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1364 struct iscsi_task *task;
1366 if (iscsi_verify_itt(conn, itt))
1369 task = iscsi_itt_to_task(conn, itt);
1370 if (!task || !task->sc)
1373 if (task->sc->SCp.phase != conn->session->age) {
1374 iscsi_session_printk(KERN_ERR, conn->session,
1375 "task's session age %d, expected %d\n",
1376 task->sc->SCp.phase, conn->session->age);
1382 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1384 void iscsi_session_failure(struct iscsi_session *session,
1387 struct iscsi_conn *conn;
1389 spin_lock_bh(&session->frwd_lock);
1390 conn = session->leadconn;
1391 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1392 spin_unlock_bh(&session->frwd_lock);
1396 iscsi_get_conn(conn->cls_conn);
1397 spin_unlock_bh(&session->frwd_lock);
1399 * if the host is being removed bypass the connection
1400 * recovery initialization because we are going to kill
1403 if (err == ISCSI_ERR_INVALID_HOST)
1404 iscsi_conn_error_event(conn->cls_conn, err);
1406 iscsi_conn_failure(conn, err);
1407 iscsi_put_conn(conn->cls_conn);
1409 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1411 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1413 struct iscsi_session *session = conn->session;
1415 spin_lock_bh(&session->frwd_lock);
1416 if (session->state == ISCSI_STATE_FAILED) {
1417 spin_unlock_bh(&session->frwd_lock);
1421 if (conn->stop_stage == 0)
1422 session->state = ISCSI_STATE_FAILED;
1423 spin_unlock_bh(&session->frwd_lock);
1425 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1426 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1427 iscsi_conn_error_event(conn->cls_conn, err);
1429 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1431 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1433 struct iscsi_session *session = conn->session;
1436 * Check for iSCSI window and take care of CmdSN wrap-around
1438 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1439 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1440 "%u MaxCmdSN %u CmdSN %u/%u\n",
1441 session->exp_cmdsn, session->max_cmdsn,
1442 session->cmdsn, session->queued_cmdsn);
1448 static int iscsi_xmit_task(struct iscsi_conn *conn)
1450 struct iscsi_task *task = conn->task;
1453 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1456 spin_lock_bh(&conn->session->back_lock);
1457 if (conn->task == NULL) {
1458 spin_unlock_bh(&conn->session->back_lock);
1461 __iscsi_get_task(task);
1462 spin_unlock_bh(&conn->session->back_lock);
1463 spin_unlock_bh(&conn->session->frwd_lock);
1464 rc = conn->session->tt->xmit_task(task);
1465 spin_lock_bh(&conn->session->frwd_lock);
1467 /* done with this task */
1468 task->last_xfer = jiffies;
1471 /* regular RX path uses back_lock */
1472 spin_lock(&conn->session->back_lock);
1473 __iscsi_put_task(task);
1474 spin_unlock(&conn->session->back_lock);
1479 * iscsi_requeue_task - requeue task to run from session workqueue
1480 * @task: task to requeue
1482 * LLDs that need to run a task from the session workqueue should call
1483 * this. The session frwd_lock must be held. This should only be called
1484 * by software drivers.
1486 void iscsi_requeue_task(struct iscsi_task *task)
1488 struct iscsi_conn *conn = task->conn;
1491 * this may be on the requeue list already if the xmit_task callout
1492 * is handling the r2ts while we are adding new ones
1494 spin_lock_bh(&conn->taskqueuelock);
1495 if (list_empty(&task->running))
1496 list_add_tail(&task->running, &conn->requeue);
1497 spin_unlock_bh(&conn->taskqueuelock);
1498 iscsi_conn_queue_work(conn);
1500 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1503 * iscsi_data_xmit - xmit any command into the scheduled connection
1504 * @conn: iscsi connection
1507 * The function can return -EAGAIN in which case the caller must
1508 * re-schedule it again later or recover. '0' return code means
1511 static int iscsi_data_xmit(struct iscsi_conn *conn)
1513 struct iscsi_task *task;
1516 spin_lock_bh(&conn->session->frwd_lock);
1517 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1518 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1519 spin_unlock_bh(&conn->session->frwd_lock);
1524 rc = iscsi_xmit_task(conn);
1530 * process mgmt pdus like nops before commands since we should
1531 * only have one nop-out as a ping from us and targets should not
1532 * overflow us with nop-ins
1534 spin_lock_bh(&conn->taskqueuelock);
1536 while (!list_empty(&conn->mgmtqueue)) {
1537 conn->task = list_entry(conn->mgmtqueue.next,
1538 struct iscsi_task, running);
1539 list_del_init(&conn->task->running);
1540 spin_unlock_bh(&conn->taskqueuelock);
1541 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1542 /* regular RX path uses back_lock */
1543 spin_lock_bh(&conn->session->back_lock);
1544 __iscsi_put_task(conn->task);
1545 spin_unlock_bh(&conn->session->back_lock);
1547 spin_lock_bh(&conn->taskqueuelock);
1550 rc = iscsi_xmit_task(conn);
1553 spin_lock_bh(&conn->taskqueuelock);
1556 /* process pending command queue */
1557 while (!list_empty(&conn->cmdqueue)) {
1558 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1560 list_del_init(&conn->task->running);
1561 spin_unlock_bh(&conn->taskqueuelock);
1562 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1563 fail_scsi_task(conn->task, DID_IMM_RETRY);
1564 spin_lock_bh(&conn->taskqueuelock);
1567 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1569 if (rc == -ENOMEM || rc == -EACCES)
1570 fail_scsi_task(conn->task, DID_IMM_RETRY);
1572 fail_scsi_task(conn->task, DID_ABORT);
1573 spin_lock_bh(&conn->taskqueuelock);
1576 rc = iscsi_xmit_task(conn);
1580 * we could continuously get new task requests so
1581 * we need to check the mgmt queue for nops that need to
1582 * be sent to aviod starvation
1584 spin_lock_bh(&conn->taskqueuelock);
1585 if (!list_empty(&conn->mgmtqueue))
1589 while (!list_empty(&conn->requeue)) {
1591 * we always do fastlogout - conn stop code will clean up.
1593 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1596 task = list_entry(conn->requeue.next, struct iscsi_task,
1598 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1602 list_del_init(&conn->task->running);
1603 conn->task->state = ISCSI_TASK_RUNNING;
1604 spin_unlock_bh(&conn->taskqueuelock);
1605 rc = iscsi_xmit_task(conn);
1608 spin_lock_bh(&conn->taskqueuelock);
1609 if (!list_empty(&conn->mgmtqueue))
1612 spin_unlock_bh(&conn->taskqueuelock);
1613 spin_unlock_bh(&conn->session->frwd_lock);
1617 spin_unlock_bh(&conn->session->frwd_lock);
1621 static void iscsi_xmitworker(struct work_struct *work)
1623 struct iscsi_conn *conn =
1624 container_of(work, struct iscsi_conn, xmitwork);
1627 * serialize Xmit worker on a per-connection basis.
1630 rc = iscsi_data_xmit(conn);
1631 } while (rc >= 0 || rc == -EAGAIN);
1634 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1635 struct scsi_cmnd *sc)
1637 struct iscsi_task *task;
1639 if (!kfifo_out(&conn->session->cmdpool.queue,
1640 (void *) &task, sizeof(void *)))
1643 sc->SCp.phase = conn->session->age;
1644 sc->SCp.ptr = (char *) task;
1646 refcount_set(&task->refcount, 1);
1647 task->state = ISCSI_TASK_PENDING;
1650 task->have_checked_conn = false;
1651 task->last_timeout = jiffies;
1652 task->last_xfer = jiffies;
1653 task->protected = false;
1654 INIT_LIST_HEAD(&task->running);
1659 FAILURE_BAD_HOST = 1,
1660 FAILURE_SESSION_FAILED,
1661 FAILURE_SESSION_FREED,
1662 FAILURE_WINDOW_CLOSED,
1664 FAILURE_SESSION_TERMINATE,
1665 FAILURE_SESSION_IN_RECOVERY,
1666 FAILURE_SESSION_RECOVERY_TIMEOUT,
1667 FAILURE_SESSION_LOGGING_OUT,
1668 FAILURE_SESSION_NOT_READY,
1671 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1673 struct iscsi_cls_session *cls_session;
1674 struct iscsi_host *ihost;
1676 struct iscsi_session *session;
1677 struct iscsi_conn *conn;
1678 struct iscsi_task *task = NULL;
1683 ihost = shost_priv(host);
1685 cls_session = starget_to_session(scsi_target(sc->device));
1686 session = cls_session->dd_data;
1687 spin_lock_bh(&session->frwd_lock);
1689 reason = iscsi_session_chkready(cls_session);
1691 sc->result = reason;
1695 if (session->state != ISCSI_STATE_LOGGED_IN) {
1697 * to handle the race between when we set the recovery state
1698 * and block the session we requeue here (commands could
1699 * be entering our queuecommand while a block is starting
1700 * up because the block code is not locked)
1702 switch (session->state) {
1703 case ISCSI_STATE_FAILED:
1705 * cmds should fail during shutdown, if the session
1706 * state is bad, allowing completion to happen
1708 if (unlikely(system_state != SYSTEM_RUNNING)) {
1709 reason = FAILURE_SESSION_FAILED;
1710 sc->result = DID_NO_CONNECT << 16;
1713 case ISCSI_STATE_IN_RECOVERY:
1714 reason = FAILURE_SESSION_IN_RECOVERY;
1715 sc->result = DID_IMM_RETRY << 16;
1717 case ISCSI_STATE_LOGGING_OUT:
1718 reason = FAILURE_SESSION_LOGGING_OUT;
1719 sc->result = DID_IMM_RETRY << 16;
1721 case ISCSI_STATE_RECOVERY_FAILED:
1722 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1723 sc->result = DID_TRANSPORT_FAILFAST << 16;
1725 case ISCSI_STATE_TERMINATE:
1726 reason = FAILURE_SESSION_TERMINATE;
1727 sc->result = DID_NO_CONNECT << 16;
1730 reason = FAILURE_SESSION_FREED;
1731 sc->result = DID_NO_CONNECT << 16;
1736 conn = session->leadconn;
1738 reason = FAILURE_SESSION_FREED;
1739 sc->result = DID_NO_CONNECT << 16;
1743 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1744 reason = FAILURE_SESSION_IN_RECOVERY;
1745 sc->result = DID_REQUEUE << 16;
1749 if (iscsi_check_cmdsn_window_closed(conn)) {
1750 reason = FAILURE_WINDOW_CLOSED;
1754 task = iscsi_alloc_task(conn, sc);
1756 reason = FAILURE_OOM;
1760 if (!ihost->workq) {
1761 reason = iscsi_prep_scsi_cmd_pdu(task);
1763 if (reason == -ENOMEM || reason == -EACCES) {
1764 reason = FAILURE_OOM;
1767 sc->result = DID_ABORT << 16;
1771 if (session->tt->xmit_task(task)) {
1773 reason = FAILURE_SESSION_NOT_READY;
1777 spin_lock_bh(&conn->taskqueuelock);
1778 list_add_tail(&task->running, &conn->cmdqueue);
1779 spin_unlock_bh(&conn->taskqueuelock);
1780 iscsi_conn_queue_work(conn);
1783 session->queued_cmdsn++;
1784 spin_unlock_bh(&session->frwd_lock);
1788 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1790 spin_unlock_bh(&session->frwd_lock);
1791 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1792 sc->cmnd[0], reason);
1793 return SCSI_MLQUEUE_TARGET_BUSY;
1796 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1798 spin_unlock_bh(&session->frwd_lock);
1799 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1800 sc->cmnd[0], reason);
1801 if (!scsi_bidi_cmnd(sc))
1802 scsi_set_resid(sc, scsi_bufflen(sc));
1804 scsi_out(sc)->resid = scsi_out(sc)->length;
1805 scsi_in(sc)->resid = scsi_in(sc)->length;
1810 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1812 int iscsi_target_alloc(struct scsi_target *starget)
1814 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1815 struct iscsi_session *session = cls_session->dd_data;
1817 starget->can_queue = session->scsi_cmds_max;
1820 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1822 static void iscsi_tmf_timedout(unsigned long data)
1824 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1825 struct iscsi_session *session = conn->session;
1827 spin_lock(&session->frwd_lock);
1828 if (conn->tmf_state == TMF_QUEUED) {
1829 conn->tmf_state = TMF_TIMEDOUT;
1830 ISCSI_DBG_EH(session, "tmf timedout\n");
1831 /* unblock eh_abort() */
1832 wake_up(&conn->ehwait);
1834 spin_unlock(&session->frwd_lock);
1837 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1838 struct iscsi_tm *hdr, int age,
1841 struct iscsi_session *session = conn->session;
1842 struct iscsi_task *task;
1844 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1847 spin_unlock_bh(&session->frwd_lock);
1848 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1849 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1850 spin_lock_bh(&session->frwd_lock);
1853 conn->tmfcmd_pdus_cnt++;
1854 conn->tmf_timer.expires = timeout * HZ + jiffies;
1855 conn->tmf_timer.function = iscsi_tmf_timedout;
1856 conn->tmf_timer.data = (unsigned long)conn;
1857 add_timer(&conn->tmf_timer);
1858 ISCSI_DBG_EH(session, "tmf set timeout\n");
1860 spin_unlock_bh(&session->frwd_lock);
1861 mutex_unlock(&session->eh_mutex);
1864 * block eh thread until:
1868 * 3) session is terminated or restarted or userspace has
1869 * given up on recovery
1871 wait_event_interruptible(conn->ehwait, age != session->age ||
1872 session->state != ISCSI_STATE_LOGGED_IN ||
1873 conn->tmf_state != TMF_QUEUED);
1874 if (signal_pending(current))
1875 flush_signals(current);
1876 del_timer_sync(&conn->tmf_timer);
1878 mutex_lock(&session->eh_mutex);
1879 spin_lock_bh(&session->frwd_lock);
1880 /* if the session drops it will clean up the task */
1881 if (age != session->age ||
1882 session->state != ISCSI_STATE_LOGGED_IN)
1888 * Fail commands. session lock held and recv side suspended and xmit
1891 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1893 struct iscsi_task *task;
1896 for (i = 0; i < conn->session->cmds_max; i++) {
1897 task = conn->session->cmds[i];
1898 if (!task->sc || task->state == ISCSI_TASK_FREE)
1901 if (lun != -1 && lun != task->sc->device->lun)
1904 ISCSI_DBG_SESSION(conn->session,
1905 "failing sc %p itt 0x%x state %d\n",
1906 task->sc, task->itt, task->state);
1907 fail_scsi_task(task, error);
1912 * iscsi_suspend_queue - suspend iscsi_queuecommand
1913 * @conn: iscsi conn to stop queueing IO on
1915 * This grabs the session frwd_lock to make sure no one is in
1916 * xmit_task/queuecommand, and then sets suspend to prevent
1917 * new commands from being queued. This only needs to be called
1918 * by offload drivers that need to sync a path like ep disconnect
1919 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1920 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1922 void iscsi_suspend_queue(struct iscsi_conn *conn)
1924 spin_lock_bh(&conn->session->frwd_lock);
1925 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1926 spin_unlock_bh(&conn->session->frwd_lock);
1928 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1931 * iscsi_suspend_tx - suspend iscsi_data_xmit
1932 * @conn: iscsi conn tp stop processing IO on.
1934 * This function sets the suspend bit to prevent iscsi_data_xmit
1935 * from sending new IO, and if work is queued on the xmit thread
1936 * it will wait for it to be completed.
1938 void iscsi_suspend_tx(struct iscsi_conn *conn)
1940 struct Scsi_Host *shost = conn->session->host;
1941 struct iscsi_host *ihost = shost_priv(shost);
1943 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1945 flush_workqueue(ihost->workq);
1947 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1949 static void iscsi_start_tx(struct iscsi_conn *conn)
1951 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1952 iscsi_conn_queue_work(conn);
1956 * We want to make sure a ping is in flight. It has timed out.
1957 * And we are not busy processing a pdu that is making
1958 * progress but got started before the ping and is taking a while
1959 * to complete so the ping is just stuck behind it in a queue.
1961 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1963 if (READ_ONCE(conn->ping_task) &&
1964 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1965 (conn->ping_timeout * HZ), jiffies))
1971 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1973 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1974 struct iscsi_task *task = NULL, *running_task;
1975 struct iscsi_cls_session *cls_session;
1976 struct iscsi_session *session;
1977 struct iscsi_conn *conn;
1980 cls_session = starget_to_session(scsi_target(sc->device));
1981 session = cls_session->dd_data;
1983 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1985 spin_lock_bh(&session->frwd_lock);
1986 task = (struct iscsi_task *)sc->SCp.ptr;
1989 * Raced with completion. Blk layer has taken ownership
1990 * so let timeout code complete it now.
1992 rc = BLK_EH_HANDLED;
1996 if (session->state != ISCSI_STATE_LOGGED_IN) {
1998 * During shutdown, if session is prematurely disconnected,
1999 * recovery won't happen and there will be hung cmds. Not
2000 * handling cmds would trigger EH, also bad in this case.
2001 * Instead, handle cmd, allow completion to happen and let
2002 * upper layer to deal with the result.
2004 if (unlikely(system_state != SYSTEM_RUNNING)) {
2005 sc->result = DID_NO_CONNECT << 16;
2006 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2007 rc = BLK_EH_HANDLED;
2011 * We are probably in the middle of iscsi recovery so let
2012 * that complete and handle the error.
2014 rc = BLK_EH_RESET_TIMER;
2018 conn = session->leadconn;
2020 /* In the middle of shuting down */
2021 rc = BLK_EH_RESET_TIMER;
2026 * If we have sent (at least queued to the network layer) a pdu or
2027 * recvd one for the task since the last timeout ask for
2028 * more time. If on the next timeout we have not made progress
2029 * we can check if it is the task or connection when we send the
2032 if (time_after(task->last_xfer, task->last_timeout)) {
2033 ISCSI_DBG_EH(session, "Command making progress. Asking "
2034 "scsi-ml for more time to complete. "
2035 "Last data xfer at %lu. Last timeout was at "
2036 "%lu\n.", task->last_xfer, task->last_timeout);
2037 task->have_checked_conn = false;
2038 rc = BLK_EH_RESET_TIMER;
2042 if (!conn->recv_timeout && !conn->ping_timeout)
2045 * if the ping timedout then we are in the middle of cleaning up
2046 * and can let the iscsi eh handle it
2048 if (iscsi_has_ping_timed_out(conn)) {
2049 rc = BLK_EH_RESET_TIMER;
2053 for (i = 0; i < conn->session->cmds_max; i++) {
2054 running_task = conn->session->cmds[i];
2055 if (!running_task->sc || running_task == task ||
2056 running_task->state != ISCSI_TASK_RUNNING)
2060 * Only check if cmds started before this one have made
2061 * progress, or this could never fail
2063 if (time_after(running_task->sc->jiffies_at_alloc,
2064 task->sc->jiffies_at_alloc))
2067 if (time_after(running_task->last_xfer, task->last_timeout)) {
2069 * This task has not made progress, but a task
2070 * started before us has transferred data since
2071 * we started/last-checked. We could be queueing
2072 * too many tasks or the LU is bad.
2074 * If the device is bad the cmds ahead of us on
2075 * other devs will complete, and this loop will
2076 * eventually fail starting the scsi eh.
2078 ISCSI_DBG_EH(session, "Command has not made progress "
2079 "but commands ahead of it have. "
2080 "Asking scsi-ml for more time to "
2081 "complete. Our last xfer vs running task "
2082 "last xfer %lu/%lu. Last check %lu.\n",
2083 task->last_xfer, running_task->last_xfer,
2084 task->last_timeout);
2085 rc = BLK_EH_RESET_TIMER;
2090 /* Assumes nop timeout is shorter than scsi cmd timeout */
2091 if (task->have_checked_conn)
2095 * Checking the transport already or nop from a cmd timeout still
2098 if (READ_ONCE(conn->ping_task)) {
2099 task->have_checked_conn = true;
2100 rc = BLK_EH_RESET_TIMER;
2104 /* Make sure there is a transport check done */
2105 iscsi_send_nopout(conn, NULL);
2106 task->have_checked_conn = true;
2107 rc = BLK_EH_RESET_TIMER;
2111 task->last_timeout = jiffies;
2112 spin_unlock_bh(&session->frwd_lock);
2113 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2114 "timer reset" : "shutdown or nh");
2117 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2119 static void iscsi_check_transport_timeouts(unsigned long data)
2121 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2122 struct iscsi_session *session = conn->session;
2123 unsigned long recv_timeout, next_timeout = 0, last_recv;
2125 spin_lock(&session->frwd_lock);
2126 if (session->state != ISCSI_STATE_LOGGED_IN)
2129 recv_timeout = conn->recv_timeout;
2134 last_recv = conn->last_recv;
2136 if (iscsi_has_ping_timed_out(conn)) {
2137 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2138 "expired, recv timeout %d, last rx %lu, "
2139 "last ping %lu, now %lu\n",
2140 conn->ping_timeout, conn->recv_timeout,
2141 last_recv, conn->last_ping, jiffies);
2142 spin_unlock(&session->frwd_lock);
2143 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2147 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2148 /* send a ping to try to provoke some traffic */
2149 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2150 if (iscsi_send_nopout(conn, NULL))
2151 next_timeout = jiffies + (1 * HZ);
2153 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2155 next_timeout = last_recv + recv_timeout;
2157 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2158 mod_timer(&conn->transport_timer, next_timeout);
2160 spin_unlock(&session->frwd_lock);
2163 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2164 struct iscsi_tm *hdr)
2166 memset(hdr, 0, sizeof(*hdr));
2167 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2168 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2169 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2170 hdr->lun = task->lun;
2171 hdr->rtt = task->hdr_itt;
2172 hdr->refcmdsn = task->cmdsn;
2175 int iscsi_eh_abort(struct scsi_cmnd *sc)
2177 struct iscsi_cls_session *cls_session;
2178 struct iscsi_session *session;
2179 struct iscsi_conn *conn;
2180 struct iscsi_task *task;
2181 struct iscsi_tm *hdr;
2184 cls_session = starget_to_session(scsi_target(sc->device));
2185 session = cls_session->dd_data;
2187 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2189 mutex_lock(&session->eh_mutex);
2190 spin_lock_bh(&session->frwd_lock);
2192 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2196 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2198 spin_unlock_bh(&session->frwd_lock);
2199 mutex_unlock(&session->eh_mutex);
2204 * If we are not logged in or we have started a new session
2205 * then let the host reset code handle this
2207 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2208 sc->SCp.phase != session->age) {
2209 spin_unlock_bh(&session->frwd_lock);
2210 mutex_unlock(&session->eh_mutex);
2211 ISCSI_DBG_EH(session, "failing abort due to dropped "
2216 conn = session->leadconn;
2217 conn->eh_abort_cnt++;
2220 task = (struct iscsi_task *)sc->SCp.ptr;
2221 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2224 /* task completed before time out */
2226 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2230 if (task->state == ISCSI_TASK_PENDING) {
2231 fail_scsi_task(task, DID_ABORT);
2235 /* only have one tmf outstanding at a time */
2236 if (conn->tmf_state != TMF_INITIAL)
2238 conn->tmf_state = TMF_QUEUED;
2241 iscsi_prep_abort_task_pdu(task, hdr);
2243 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2246 switch (conn->tmf_state) {
2248 spin_unlock_bh(&session->frwd_lock);
2250 * stop tx side incase the target had sent a abort rsp but
2251 * the initiator was still writing out data.
2253 iscsi_suspend_tx(conn);
2255 * we do not stop the recv side because targets have been
2256 * good and have never sent us a successful tmf response
2257 * then sent more data for the cmd.
2259 spin_lock_bh(&session->frwd_lock);
2260 fail_scsi_task(task, DID_ABORT);
2261 conn->tmf_state = TMF_INITIAL;
2262 memset(hdr, 0, sizeof(*hdr));
2263 spin_unlock_bh(&session->frwd_lock);
2264 iscsi_start_tx(conn);
2265 goto success_unlocked;
2267 spin_unlock_bh(&session->frwd_lock);
2268 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2269 goto failed_unlocked;
2272 conn->tmf_state = TMF_INITIAL;
2273 memset(hdr, 0, sizeof(*hdr));
2274 /* task completed before tmf abort response */
2275 ISCSI_DBG_EH(session, "sc completed while abort in "
2281 conn->tmf_state = TMF_INITIAL;
2286 spin_unlock_bh(&session->frwd_lock);
2288 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2290 mutex_unlock(&session->eh_mutex);
2294 spin_unlock_bh(&session->frwd_lock);
2296 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2297 task ? task->itt : 0);
2298 mutex_unlock(&session->eh_mutex);
2301 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2303 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2305 memset(hdr, 0, sizeof(*hdr));
2306 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2307 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2308 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2309 int_to_scsilun(sc->device->lun, &hdr->lun);
2310 hdr->rtt = RESERVED_ITT;
2313 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2315 struct iscsi_cls_session *cls_session;
2316 struct iscsi_session *session;
2317 struct iscsi_conn *conn;
2318 struct iscsi_tm *hdr;
2321 cls_session = starget_to_session(scsi_target(sc->device));
2322 session = cls_session->dd_data;
2324 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2327 mutex_lock(&session->eh_mutex);
2328 spin_lock_bh(&session->frwd_lock);
2330 * Just check if we are not logged in. We cannot check for
2331 * the phase because the reset could come from a ioctl.
2333 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2335 conn = session->leadconn;
2337 /* only have one tmf outstanding at a time */
2338 if (conn->tmf_state != TMF_INITIAL)
2340 conn->tmf_state = TMF_QUEUED;
2343 iscsi_prep_lun_reset_pdu(sc, hdr);
2345 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2346 session->lu_reset_timeout)) {
2351 switch (conn->tmf_state) {
2355 spin_unlock_bh(&session->frwd_lock);
2356 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2359 conn->tmf_state = TMF_INITIAL;
2364 spin_unlock_bh(&session->frwd_lock);
2366 iscsi_suspend_tx(conn);
2368 spin_lock_bh(&session->frwd_lock);
2369 memset(hdr, 0, sizeof(*hdr));
2370 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2371 conn->tmf_state = TMF_INITIAL;
2372 spin_unlock_bh(&session->frwd_lock);
2374 iscsi_start_tx(conn);
2378 spin_unlock_bh(&session->frwd_lock);
2380 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2381 rc == SUCCESS ? "SUCCESS" : "FAILED");
2382 mutex_unlock(&session->eh_mutex);
2385 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2387 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2389 struct iscsi_session *session = cls_session->dd_data;
2391 spin_lock_bh(&session->frwd_lock);
2392 if (session->state != ISCSI_STATE_LOGGED_IN) {
2393 session->state = ISCSI_STATE_RECOVERY_FAILED;
2394 if (session->leadconn)
2395 wake_up(&session->leadconn->ehwait);
2397 spin_unlock_bh(&session->frwd_lock);
2399 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2402 * iscsi_eh_session_reset - drop session and attempt relogin
2405 * This function will wait for a relogin, session termination from
2406 * userspace, or a recovery/replacement timeout.
2408 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2410 struct iscsi_cls_session *cls_session;
2411 struct iscsi_session *session;
2412 struct iscsi_conn *conn;
2414 cls_session = starget_to_session(scsi_target(sc->device));
2415 session = cls_session->dd_data;
2416 conn = session->leadconn;
2418 mutex_lock(&session->eh_mutex);
2419 spin_lock_bh(&session->frwd_lock);
2420 if (session->state == ISCSI_STATE_TERMINATE) {
2422 ISCSI_DBG_EH(session,
2423 "failing session reset: Could not log back into "
2424 "%s [age %d]\n", session->targetname,
2426 spin_unlock_bh(&session->frwd_lock);
2427 mutex_unlock(&session->eh_mutex);
2431 spin_unlock_bh(&session->frwd_lock);
2432 mutex_unlock(&session->eh_mutex);
2434 * we drop the lock here but the leadconn cannot be destoyed while
2435 * we are in the scsi eh
2437 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2439 ISCSI_DBG_EH(session, "wait for relogin\n");
2440 wait_event_interruptible(conn->ehwait,
2441 session->state == ISCSI_STATE_TERMINATE ||
2442 session->state == ISCSI_STATE_LOGGED_IN ||
2443 session->state == ISCSI_STATE_RECOVERY_FAILED);
2444 if (signal_pending(current))
2445 flush_signals(current);
2447 mutex_lock(&session->eh_mutex);
2448 spin_lock_bh(&session->frwd_lock);
2449 if (session->state == ISCSI_STATE_LOGGED_IN) {
2450 ISCSI_DBG_EH(session,
2451 "session reset succeeded for %s,%s\n",
2452 session->targetname, conn->persistent_address);
2455 spin_unlock_bh(&session->frwd_lock);
2456 mutex_unlock(&session->eh_mutex);
2459 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2461 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2463 memset(hdr, 0, sizeof(*hdr));
2464 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2465 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2466 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2467 hdr->rtt = RESERVED_ITT;
2471 * iscsi_eh_target_reset - reset target
2474 * This will attempt to send a warm target reset.
2476 static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2478 struct iscsi_cls_session *cls_session;
2479 struct iscsi_session *session;
2480 struct iscsi_conn *conn;
2481 struct iscsi_tm *hdr;
2484 cls_session = starget_to_session(scsi_target(sc->device));
2485 session = cls_session->dd_data;
2487 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2488 session->targetname);
2490 mutex_lock(&session->eh_mutex);
2491 spin_lock_bh(&session->frwd_lock);
2493 * Just check if we are not logged in. We cannot check for
2494 * the phase because the reset could come from a ioctl.
2496 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2498 conn = session->leadconn;
2500 /* only have one tmf outstanding at a time */
2501 if (conn->tmf_state != TMF_INITIAL)
2503 conn->tmf_state = TMF_QUEUED;
2506 iscsi_prep_tgt_reset_pdu(sc, hdr);
2508 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2509 session->tgt_reset_timeout)) {
2514 switch (conn->tmf_state) {
2518 spin_unlock_bh(&session->frwd_lock);
2519 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2522 conn->tmf_state = TMF_INITIAL;
2527 spin_unlock_bh(&session->frwd_lock);
2529 iscsi_suspend_tx(conn);
2531 spin_lock_bh(&session->frwd_lock);
2532 memset(hdr, 0, sizeof(*hdr));
2533 fail_scsi_tasks(conn, -1, DID_ERROR);
2534 conn->tmf_state = TMF_INITIAL;
2535 spin_unlock_bh(&session->frwd_lock);
2537 iscsi_start_tx(conn);
2541 spin_unlock_bh(&session->frwd_lock);
2543 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2544 rc == SUCCESS ? "SUCCESS" : "FAILED");
2545 mutex_unlock(&session->eh_mutex);
2550 * iscsi_eh_recover_target - reset target and possibly the session
2553 * This will attempt to send a warm target reset. If that fails,
2554 * we will escalate to ERL0 session recovery.
2556 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2560 rc = iscsi_eh_target_reset(sc);
2562 rc = iscsi_eh_session_reset(sc);
2565 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2568 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2569 * should be accessed via kfifo_{get,put} on q->queue.
2570 * Optionally, the caller can obtain the array of object pointers
2571 * by passing in a non-NULL @items pointer
2574 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2576 int i, num_arrays = 1;
2578 memset(q, 0, sizeof(*q));
2582 /* If the user passed an items pointer, he wants a copy of
2586 q->pool = kvzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2587 if (q->pool == NULL)
2590 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2592 for (i = 0; i < max; i++) {
2593 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2594 if (q->pool[i] == NULL) {
2598 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2602 *items = q->pool + max;
2603 memcpy(*items, q->pool, max * sizeof(void *));
2612 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2614 void iscsi_pool_free(struct iscsi_pool *q)
2618 for (i = 0; i < q->max; i++)
2622 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2625 * iscsi_host_add - add host to system
2627 * @pdev: parent device
2629 * This should be called by partial offload and software iscsi drivers
2630 * to add a host to the system.
2632 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2634 if (!shost->can_queue)
2635 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2637 if (!shost->cmd_per_lun)
2638 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
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 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2884 struct iscsi_session *session = cls_session->dd_data;
2885 struct module *owner = cls_session->transport->owner;
2886 struct Scsi_Host *shost = session->host;
2888 iscsi_pool_free(&session->cmdpool);
2890 iscsi_remove_session(cls_session);
2892 kfree(session->password);
2893 kfree(session->password_in);
2894 kfree(session->username);
2895 kfree(session->username_in);
2896 kfree(session->targetname);
2897 kfree(session->targetalias);
2898 kfree(session->initiatorname);
2899 kfree(session->boot_root);
2900 kfree(session->boot_nic);
2901 kfree(session->boot_target);
2902 kfree(session->ifacename);
2903 kfree(session->portal_type);
2904 kfree(session->discovery_parent_type);
2906 iscsi_free_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;
2995 del_timer_sync(&conn->transport_timer);
2997 mutex_lock(&session->eh_mutex);
2998 spin_lock_bh(&session->frwd_lock);
2999 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
3000 if (session->leadconn == conn) {
3002 * leading connection? then give up on recovery.
3004 session->state = ISCSI_STATE_TERMINATE;
3005 wake_up(&conn->ehwait);
3007 spin_unlock_bh(&session->frwd_lock);
3009 /* flush queued up work because we free the connection below */
3010 iscsi_suspend_tx(conn);
3012 spin_lock_bh(&session->frwd_lock);
3013 free_pages((unsigned long) conn->data,
3014 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3015 kfree(conn->persistent_address);
3016 kfree(conn->local_ipaddr);
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);
3029 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3031 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3033 struct iscsi_conn *conn = cls_conn->dd_data;
3034 struct iscsi_session *session = conn->session;
3037 iscsi_conn_printk(KERN_ERR, conn,
3038 "can't start unbound connection\n");
3042 if ((session->imm_data_en || !session->initial_r2t_en) &&
3043 session->first_burst > session->max_burst) {
3044 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3045 "first_burst %d max_burst %d\n",
3046 session->first_burst, session->max_burst);
3050 if (conn->ping_timeout && !conn->recv_timeout) {
3051 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3052 "zero. Using 5 seconds\n.");
3053 conn->recv_timeout = 5;
3056 if (conn->recv_timeout && !conn->ping_timeout) {
3057 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3058 "zero. Using 5 seconds.\n");
3059 conn->ping_timeout = 5;
3062 spin_lock_bh(&session->frwd_lock);
3063 conn->c_stage = ISCSI_CONN_STARTED;
3064 session->state = ISCSI_STATE_LOGGED_IN;
3065 session->queued_cmdsn = session->cmdsn;
3067 conn->last_recv = jiffies;
3068 conn->last_ping = jiffies;
3069 if (conn->recv_timeout && conn->ping_timeout)
3070 mod_timer(&conn->transport_timer,
3071 jiffies + (conn->recv_timeout * HZ));
3073 switch(conn->stop_stage) {
3074 case STOP_CONN_RECOVER:
3076 * unblock eh_abort() if it is blocked. re-try all
3077 * commands after successful recovery
3079 conn->stop_stage = 0;
3080 conn->tmf_state = TMF_INITIAL;
3082 if (session->age == 16)
3085 case STOP_CONN_TERM:
3086 conn->stop_stage = 0;
3091 spin_unlock_bh(&session->frwd_lock);
3093 iscsi_unblock_session(session->cls_session);
3094 wake_up(&conn->ehwait);
3097 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3100 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3102 struct iscsi_task *task;
3105 for (i = 0; i < conn->session->cmds_max; i++) {
3106 task = conn->session->cmds[i];
3110 if (task->state == ISCSI_TASK_FREE)
3113 ISCSI_DBG_SESSION(conn->session,
3114 "failing mgmt itt 0x%x state %d\n",
3115 task->itt, task->state);
3116 state = ISCSI_TASK_ABRT_SESS_RECOV;
3117 if (task->state == ISCSI_TASK_PENDING)
3118 state = ISCSI_TASK_COMPLETED;
3119 iscsi_complete_task(task, state);
3124 static void iscsi_start_session_recovery(struct iscsi_session *session,
3125 struct iscsi_conn *conn, int flag)
3129 mutex_lock(&session->eh_mutex);
3130 spin_lock_bh(&session->frwd_lock);
3131 if (conn->stop_stage == STOP_CONN_TERM) {
3132 spin_unlock_bh(&session->frwd_lock);
3133 mutex_unlock(&session->eh_mutex);
3138 * When this is called for the in_login state, we only want to clean
3139 * up the login task and connection. We do not need to block and set
3140 * the recovery state again
3142 if (flag == STOP_CONN_TERM)
3143 session->state = ISCSI_STATE_TERMINATE;
3144 else if (conn->stop_stage != STOP_CONN_RECOVER)
3145 session->state = ISCSI_STATE_IN_RECOVERY;
3147 old_stop_stage = conn->stop_stage;
3148 conn->stop_stage = flag;
3149 spin_unlock_bh(&session->frwd_lock);
3151 del_timer_sync(&conn->transport_timer);
3152 iscsi_suspend_tx(conn);
3154 spin_lock_bh(&session->frwd_lock);
3155 conn->c_stage = ISCSI_CONN_STOPPED;
3156 spin_unlock_bh(&session->frwd_lock);
3159 * for connection level recovery we should not calculate
3160 * header digest. conn->hdr_size used for optimization
3161 * in hdr_extract() and will be re-negotiated at
3164 if (flag == STOP_CONN_RECOVER) {
3165 conn->hdrdgst_en = 0;
3166 conn->datadgst_en = 0;
3167 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3168 old_stop_stage != STOP_CONN_RECOVER) {
3169 ISCSI_DBG_SESSION(session, "blocking session\n");
3170 iscsi_block_session(session->cls_session);
3177 spin_lock_bh(&session->frwd_lock);
3178 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3179 fail_mgmt_tasks(session, conn);
3180 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3181 spin_unlock_bh(&session->frwd_lock);
3182 mutex_unlock(&session->eh_mutex);
3185 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3187 struct iscsi_conn *conn = cls_conn->dd_data;
3188 struct iscsi_session *session = conn->session;
3191 case STOP_CONN_RECOVER:
3192 case STOP_CONN_TERM:
3193 iscsi_start_session_recovery(session, conn, flag);
3196 iscsi_conn_printk(KERN_ERR, conn,
3197 "invalid stop flag %d\n", flag);
3200 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3202 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3203 struct iscsi_cls_conn *cls_conn, int is_leading)
3205 struct iscsi_session *session = cls_session->dd_data;
3206 struct iscsi_conn *conn = cls_conn->dd_data;
3208 spin_lock_bh(&session->frwd_lock);
3210 session->leadconn = conn;
3211 spin_unlock_bh(&session->frwd_lock);
3214 * Unblock xmitworker(), Login Phase will pass through.
3216 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3217 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3220 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3222 int iscsi_switch_str_param(char **param, char *new_val_buf)
3227 if (!strcmp(*param, new_val_buf))
3231 new_val = kstrdup(new_val_buf, GFP_NOIO);
3239 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3241 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3242 enum iscsi_param param, char *buf, int buflen)
3244 struct iscsi_conn *conn = cls_conn->dd_data;
3245 struct iscsi_session *session = conn->session;
3249 case ISCSI_PARAM_FAST_ABORT:
3250 sscanf(buf, "%d", &session->fast_abort);
3252 case ISCSI_PARAM_ABORT_TMO:
3253 sscanf(buf, "%d", &session->abort_timeout);
3255 case ISCSI_PARAM_LU_RESET_TMO:
3256 sscanf(buf, "%d", &session->lu_reset_timeout);
3258 case ISCSI_PARAM_TGT_RESET_TMO:
3259 sscanf(buf, "%d", &session->tgt_reset_timeout);
3261 case ISCSI_PARAM_PING_TMO:
3262 sscanf(buf, "%d", &conn->ping_timeout);
3264 case ISCSI_PARAM_RECV_TMO:
3265 sscanf(buf, "%d", &conn->recv_timeout);
3267 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3268 sscanf(buf, "%d", &conn->max_recv_dlength);
3270 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3271 sscanf(buf, "%d", &conn->max_xmit_dlength);
3273 case ISCSI_PARAM_HDRDGST_EN:
3274 sscanf(buf, "%d", &conn->hdrdgst_en);
3276 case ISCSI_PARAM_DATADGST_EN:
3277 sscanf(buf, "%d", &conn->datadgst_en);
3279 case ISCSI_PARAM_INITIAL_R2T_EN:
3280 sscanf(buf, "%d", &session->initial_r2t_en);
3282 case ISCSI_PARAM_MAX_R2T:
3283 sscanf(buf, "%hu", &session->max_r2t);
3285 case ISCSI_PARAM_IMM_DATA_EN:
3286 sscanf(buf, "%d", &session->imm_data_en);
3288 case ISCSI_PARAM_FIRST_BURST:
3289 sscanf(buf, "%d", &session->first_burst);
3291 case ISCSI_PARAM_MAX_BURST:
3292 sscanf(buf, "%d", &session->max_burst);
3294 case ISCSI_PARAM_PDU_INORDER_EN:
3295 sscanf(buf, "%d", &session->pdu_inorder_en);
3297 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3298 sscanf(buf, "%d", &session->dataseq_inorder_en);
3300 case ISCSI_PARAM_ERL:
3301 sscanf(buf, "%d", &session->erl);
3303 case ISCSI_PARAM_EXP_STATSN:
3304 sscanf(buf, "%u", &conn->exp_statsn);
3306 case ISCSI_PARAM_USERNAME:
3307 return iscsi_switch_str_param(&session->username, buf);
3308 case ISCSI_PARAM_USERNAME_IN:
3309 return iscsi_switch_str_param(&session->username_in, buf);
3310 case ISCSI_PARAM_PASSWORD:
3311 return iscsi_switch_str_param(&session->password, buf);
3312 case ISCSI_PARAM_PASSWORD_IN:
3313 return iscsi_switch_str_param(&session->password_in, buf);
3314 case ISCSI_PARAM_TARGET_NAME:
3315 return iscsi_switch_str_param(&session->targetname, buf);
3316 case ISCSI_PARAM_TARGET_ALIAS:
3317 return iscsi_switch_str_param(&session->targetalias, buf);
3318 case ISCSI_PARAM_TPGT:
3319 sscanf(buf, "%d", &session->tpgt);
3321 case ISCSI_PARAM_PERSISTENT_PORT:
3322 sscanf(buf, "%d", &conn->persistent_port);
3324 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3325 return iscsi_switch_str_param(&conn->persistent_address, buf);
3326 case ISCSI_PARAM_IFACE_NAME:
3327 return iscsi_switch_str_param(&session->ifacename, buf);
3328 case ISCSI_PARAM_INITIATOR_NAME:
3329 return iscsi_switch_str_param(&session->initiatorname, buf);
3330 case ISCSI_PARAM_BOOT_ROOT:
3331 return iscsi_switch_str_param(&session->boot_root, buf);
3332 case ISCSI_PARAM_BOOT_NIC:
3333 return iscsi_switch_str_param(&session->boot_nic, buf);
3334 case ISCSI_PARAM_BOOT_TARGET:
3335 return iscsi_switch_str_param(&session->boot_target, buf);
3336 case ISCSI_PARAM_PORTAL_TYPE:
3337 return iscsi_switch_str_param(&session->portal_type, buf);
3338 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3339 return iscsi_switch_str_param(&session->discovery_parent_type,
3341 case ISCSI_PARAM_DISCOVERY_SESS:
3342 sscanf(buf, "%d", &val);
3343 session->discovery_sess = !!val;
3345 case ISCSI_PARAM_LOCAL_IPADDR:
3346 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3353 EXPORT_SYMBOL_GPL(iscsi_set_param);
3355 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3356 enum iscsi_param param, char *buf)
3358 struct iscsi_session *session = cls_session->dd_data;
3362 case ISCSI_PARAM_FAST_ABORT:
3363 len = sysfs_emit(buf, "%d\n", session->fast_abort);
3365 case ISCSI_PARAM_ABORT_TMO:
3366 len = sysfs_emit(buf, "%d\n", session->abort_timeout);
3368 case ISCSI_PARAM_LU_RESET_TMO:
3369 len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout);
3371 case ISCSI_PARAM_TGT_RESET_TMO:
3372 len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout);
3374 case ISCSI_PARAM_INITIAL_R2T_EN:
3375 len = sysfs_emit(buf, "%d\n", session->initial_r2t_en);
3377 case ISCSI_PARAM_MAX_R2T:
3378 len = sysfs_emit(buf, "%hu\n", session->max_r2t);
3380 case ISCSI_PARAM_IMM_DATA_EN:
3381 len = sysfs_emit(buf, "%d\n", session->imm_data_en);
3383 case ISCSI_PARAM_FIRST_BURST:
3384 len = sysfs_emit(buf, "%u\n", session->first_burst);
3386 case ISCSI_PARAM_MAX_BURST:
3387 len = sysfs_emit(buf, "%u\n", session->max_burst);
3389 case ISCSI_PARAM_PDU_INORDER_EN:
3390 len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en);
3392 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3393 len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en);
3395 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3396 len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo);
3398 case ISCSI_PARAM_ERL:
3399 len = sysfs_emit(buf, "%d\n", session->erl);
3401 case ISCSI_PARAM_TARGET_NAME:
3402 len = sysfs_emit(buf, "%s\n", session->targetname);
3404 case ISCSI_PARAM_TARGET_ALIAS:
3405 len = sysfs_emit(buf, "%s\n", session->targetalias);
3407 case ISCSI_PARAM_TPGT:
3408 len = sysfs_emit(buf, "%d\n", session->tpgt);
3410 case ISCSI_PARAM_USERNAME:
3411 len = sysfs_emit(buf, "%s\n", session->username);
3413 case ISCSI_PARAM_USERNAME_IN:
3414 len = sysfs_emit(buf, "%s\n", session->username_in);
3416 case ISCSI_PARAM_PASSWORD:
3417 len = sysfs_emit(buf, "%s\n", session->password);
3419 case ISCSI_PARAM_PASSWORD_IN:
3420 len = sysfs_emit(buf, "%s\n", session->password_in);
3422 case ISCSI_PARAM_IFACE_NAME:
3423 len = sysfs_emit(buf, "%s\n", session->ifacename);
3425 case ISCSI_PARAM_INITIATOR_NAME:
3426 len = sysfs_emit(buf, "%s\n", session->initiatorname);
3428 case ISCSI_PARAM_BOOT_ROOT:
3429 len = sysfs_emit(buf, "%s\n", session->boot_root);
3431 case ISCSI_PARAM_BOOT_NIC:
3432 len = sysfs_emit(buf, "%s\n", session->boot_nic);
3434 case ISCSI_PARAM_BOOT_TARGET:
3435 len = sysfs_emit(buf, "%s\n", session->boot_target);
3437 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3438 len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable);
3440 case ISCSI_PARAM_DISCOVERY_SESS:
3441 len = sysfs_emit(buf, "%u\n", session->discovery_sess);
3443 case ISCSI_PARAM_PORTAL_TYPE:
3444 len = sysfs_emit(buf, "%s\n", session->portal_type);
3446 case ISCSI_PARAM_CHAP_AUTH_EN:
3447 len = sysfs_emit(buf, "%u\n", session->chap_auth_en);
3449 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3450 len = sysfs_emit(buf, "%u\n", session->discovery_logout_en);
3452 case ISCSI_PARAM_BIDI_CHAP_EN:
3453 len = sysfs_emit(buf, "%u\n", session->bidi_chap_en);
3455 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3456 len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional);
3458 case ISCSI_PARAM_DEF_TIME2WAIT:
3459 len = sysfs_emit(buf, "%d\n", session->time2wait);
3461 case ISCSI_PARAM_DEF_TIME2RETAIN:
3462 len = sysfs_emit(buf, "%d\n", session->time2retain);
3464 case ISCSI_PARAM_TSID:
3465 len = sysfs_emit(buf, "%u\n", session->tsid);
3467 case ISCSI_PARAM_ISID:
3468 len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n",
3469 session->isid[0], session->isid[1],
3470 session->isid[2], session->isid[3],
3471 session->isid[4], session->isid[5]);
3473 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3474 len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx);
3476 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3477 if (session->discovery_parent_type)
3478 len = sysfs_emit(buf, "%s\n",
3479 session->discovery_parent_type);
3481 len = sysfs_emit(buf, "\n");
3489 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3491 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3492 enum iscsi_param param, char *buf)
3494 struct sockaddr_in6 *sin6 = NULL;
3495 struct sockaddr_in *sin = NULL;
3498 switch (addr->ss_family) {
3500 sin = (struct sockaddr_in *)addr;
3503 sin6 = (struct sockaddr_in6 *)addr;
3510 case ISCSI_PARAM_CONN_ADDRESS:
3511 case ISCSI_HOST_PARAM_IPADDRESS:
3513 len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr);
3515 len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr);
3517 case ISCSI_PARAM_CONN_PORT:
3518 case ISCSI_PARAM_LOCAL_PORT:
3520 len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3522 len = sysfs_emit(buf, "%hu\n",
3523 be16_to_cpu(sin6->sin6_port));
3531 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3533 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3534 enum iscsi_param param, char *buf)
3536 struct iscsi_conn *conn = cls_conn->dd_data;
3540 case ISCSI_PARAM_PING_TMO:
3541 len = sysfs_emit(buf, "%u\n", conn->ping_timeout);
3543 case ISCSI_PARAM_RECV_TMO:
3544 len = sysfs_emit(buf, "%u\n", conn->recv_timeout);
3546 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3547 len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength);
3549 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3550 len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength);
3552 case ISCSI_PARAM_HDRDGST_EN:
3553 len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en);
3555 case ISCSI_PARAM_DATADGST_EN:
3556 len = sysfs_emit(buf, "%d\n", conn->datadgst_en);
3558 case ISCSI_PARAM_IFMARKER_EN:
3559 len = sysfs_emit(buf, "%d\n", conn->ifmarker_en);
3561 case ISCSI_PARAM_OFMARKER_EN:
3562 len = sysfs_emit(buf, "%d\n", conn->ofmarker_en);
3564 case ISCSI_PARAM_EXP_STATSN:
3565 len = sysfs_emit(buf, "%u\n", conn->exp_statsn);
3567 case ISCSI_PARAM_PERSISTENT_PORT:
3568 len = sysfs_emit(buf, "%d\n", conn->persistent_port);
3570 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3571 len = sysfs_emit(buf, "%s\n", conn->persistent_address);
3573 case ISCSI_PARAM_STATSN:
3574 len = sysfs_emit(buf, "%u\n", conn->statsn);
3576 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3577 len = sysfs_emit(buf, "%u\n", conn->max_segment_size);
3579 case ISCSI_PARAM_KEEPALIVE_TMO:
3580 len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo);
3582 case ISCSI_PARAM_LOCAL_PORT:
3583 len = sysfs_emit(buf, "%u\n", conn->local_port);
3585 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3586 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat);
3588 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3589 len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable);
3591 case ISCSI_PARAM_TCP_WSF_DISABLE:
3592 len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable);
3594 case ISCSI_PARAM_TCP_TIMER_SCALE:
3595 len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale);
3597 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3598 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en);
3600 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3601 len = sysfs_emit(buf, "%u\n", conn->fragment_disable);
3603 case ISCSI_PARAM_IPV4_TOS:
3604 len = sysfs_emit(buf, "%u\n", conn->ipv4_tos);
3606 case ISCSI_PARAM_IPV6_TC:
3607 len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class);
3609 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3610 len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label);
3612 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3613 len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6);
3615 case ISCSI_PARAM_TCP_XMIT_WSF:
3616 len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf);
3618 case ISCSI_PARAM_TCP_RECV_WSF:
3619 len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf);
3621 case ISCSI_PARAM_LOCAL_IPADDR:
3622 len = sysfs_emit(buf, "%s\n", conn->local_ipaddr);
3630 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3632 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3635 struct iscsi_host *ihost = shost_priv(shost);
3639 case ISCSI_HOST_PARAM_NETDEV_NAME:
3640 len = sysfs_emit(buf, "%s\n", ihost->netdev);
3642 case ISCSI_HOST_PARAM_HWADDRESS:
3643 len = sysfs_emit(buf, "%s\n", ihost->hwaddress);
3645 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3646 len = sysfs_emit(buf, "%s\n", ihost->initiatorname);
3654 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3656 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3657 char *buf, int buflen)
3659 struct iscsi_host *ihost = shost_priv(shost);
3662 case ISCSI_HOST_PARAM_NETDEV_NAME:
3663 return iscsi_switch_str_param(&ihost->netdev, buf);
3664 case ISCSI_HOST_PARAM_HWADDRESS:
3665 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3666 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3667 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3674 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3676 MODULE_AUTHOR("Mike Christie");
3677 MODULE_DESCRIPTION("iSCSI library functions");
3678 MODULE_LICENSE("GPL");