1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2004 - 2006 Mike Christie
7 * Copyright (C) 2004 - 2005 Dmitry Yusupov
8 * Copyright (C) 2004 - 2005 Alex Aizman
9 * maintained by open-iscsi@googlegroups.com
11 #include <linux/types.h>
12 #include <linux/kfifo.h>
13 #include <linux/delay.h>
14 #include <linux/log2.h>
15 #include <linux/slab.h>
16 #include <linux/sched/signal.h>
17 #include <linux/module.h>
18 #include <asm/unaligned.h>
20 #include <scsi/scsi_cmnd.h>
21 #include <scsi/scsi_device.h>
22 #include <scsi/scsi_eh.h>
23 #include <scsi/scsi_tcq.h>
24 #include <scsi/scsi_host.h>
25 #include <scsi/scsi.h>
26 #include <scsi/iscsi_proto.h>
27 #include <scsi/scsi_transport.h>
28 #include <scsi/scsi_transport_iscsi.h>
29 #include <scsi/libiscsi.h>
30 #include <trace/events/iscsi.h>
32 static int iscsi_dbg_lib_conn;
33 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
35 MODULE_PARM_DESC(debug_libiscsi_conn,
36 "Turn on debugging for connections in libiscsi module. "
37 "Set to 1 to turn on, and zero to turn off. Default is off.");
39 static int iscsi_dbg_lib_session;
40 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
42 MODULE_PARM_DESC(debug_libiscsi_session,
43 "Turn on debugging for sessions in libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default is off.");
46 static int iscsi_dbg_lib_eh;
47 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
49 MODULE_PARM_DESC(debug_libiscsi_eh,
50 "Turn on debugging for error handling in libiscsi module. "
51 "Set to 1 to turn on, and zero to turn off. Default is off.");
53 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
55 if (iscsi_dbg_lib_conn) \
56 iscsi_conn_printk(KERN_INFO, _conn, \
59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
60 &(_conn)->cls_conn->dev, \
61 "%s " dbg_fmt, __func__, ##arg);\
64 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
66 if (iscsi_dbg_lib_session) \
67 iscsi_session_printk(KERN_INFO, _session, \
70 iscsi_dbg_trace(trace_iscsi_dbg_session, \
71 &(_session)->cls_session->dev, \
72 "%s " dbg_fmt, __func__, ##arg); \
75 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
77 if (iscsi_dbg_lib_eh) \
78 iscsi_session_printk(KERN_INFO, _session, \
81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
82 &(_session)->cls_session->dev, \
83 "%s " dbg_fmt, __func__, ##arg); \
86 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
88 struct Scsi_Host *shost = conn->session->host;
89 struct iscsi_host *ihost = shost_priv(shost);
92 queue_work(ihost->workq, &conn->xmitwork);
94 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
96 static void __iscsi_update_cmdsn(struct iscsi_session *session,
97 uint32_t exp_cmdsn, uint32_t max_cmdsn)
100 * standard specifies this check for when to update expected and
101 * max sequence numbers
103 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
106 if (exp_cmdsn != session->exp_cmdsn &&
107 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
108 session->exp_cmdsn = exp_cmdsn;
110 if (max_cmdsn != session->max_cmdsn &&
111 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
112 session->max_cmdsn = max_cmdsn;
115 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
117 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
118 be32_to_cpu(hdr->max_cmdsn));
120 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
123 * iscsi_prep_data_out_pdu - initialize Data-Out
124 * @task: scsi command task
126 * @hdr: iscsi data in pdu
129 * Initialize Data-Out within this R2T sequence and finds
130 * proper data_offset within this SCSI command.
132 * This function is called with connection lock taken.
134 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
135 struct iscsi_data *hdr)
137 struct iscsi_conn *conn = task->conn;
138 unsigned int left = r2t->data_length - r2t->sent;
140 task->hdr_len = sizeof(struct iscsi_data);
142 memset(hdr, 0, sizeof(struct iscsi_data));
144 hdr->datasn = cpu_to_be32(r2t->datasn);
146 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
147 hdr->lun = task->lun;
148 hdr->itt = task->hdr_itt;
149 hdr->exp_statsn = r2t->exp_statsn;
150 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
151 if (left > conn->max_xmit_dlength) {
152 hton24(hdr->dlength, conn->max_xmit_dlength);
153 r2t->data_count = conn->max_xmit_dlength;
156 hton24(hdr->dlength, left);
157 r2t->data_count = left;
158 hdr->flags = ISCSI_FLAG_CMD_FINAL;
160 conn->dataout_pdus_cnt++;
162 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
164 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
166 unsigned exp_len = task->hdr_len + len;
168 if (exp_len > task->hdr_max) {
173 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
174 task->hdr_len = exp_len;
179 * make an extended cdb AHS
181 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
183 struct scsi_cmnd *cmd = task->sc;
184 unsigned rlen, pad_len;
185 unsigned short ahslength;
186 struct iscsi_ecdb_ahdr *ecdb_ahdr;
189 ecdb_ahdr = iscsi_next_hdr(task);
190 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
192 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
193 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
195 pad_len = iscsi_padding(rlen);
197 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
198 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
203 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
205 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
206 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
207 ecdb_ahdr->reserved = 0;
208 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
210 ISCSI_DBG_SESSION(task->conn->session,
211 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
212 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
213 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
219 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
221 * @opcode: opcode to check for
223 * During TMF a task has to be checked if it's affected.
224 * All unrelated I/O can be passed through, but I/O to the
225 * affected LUN should be restricted.
226 * If 'fast_abort' is set we won't be sending any I/O to the
228 * Otherwise the target is waiting for all TTTs to be completed,
229 * so we have to send all outstanding Data-Out PDUs to the target.
231 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
233 struct iscsi_session *session = task->conn->session;
234 struct iscsi_tm *tmf = &session->tmhdr;
237 if (session->tmf_state == TMF_INITIAL)
240 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
243 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
244 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
246 * Allow PDUs for unrelated LUNs
248 hdr_lun = scsilun_to_int(&tmf->lun);
249 if (hdr_lun != task->sc->device->lun)
252 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
254 * Fail all SCSI cmd PDUs
256 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
257 iscsi_session_printk(KERN_INFO, session,
258 "task [op %x itt 0x%x/0x%x] rejected.\n",
259 opcode, task->itt, task->hdr_itt);
263 * And also all data-out PDUs in response to R2T
264 * if fast_abort is set.
266 if (session->fast_abort) {
267 iscsi_session_printk(KERN_INFO, session,
268 "task [op %x itt 0x%x/0x%x] fast abort.\n",
269 opcode, task->itt, task->hdr_itt);
273 case ISCSI_TM_FUNC_ABORT_TASK:
275 * the caller has already checked if the task
276 * they want to abort was in the pending queue so if
277 * we are here the cmd pdu has gone out already, and
278 * we will only hit this for data-outs
280 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
281 task->hdr_itt == tmf->rtt) {
282 ISCSI_DBG_SESSION(session,
283 "Preventing task %x/%x from sending "
284 "data-out due to abort task in "
285 "progress\n", task->itt,
296 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
299 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
300 * fields like dlength or final based on how much data it sends
302 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
304 struct iscsi_conn *conn = task->conn;
305 struct iscsi_session *session = conn->session;
306 struct scsi_cmnd *sc = task->sc;
307 struct iscsi_scsi_req *hdr;
308 unsigned hdrlength, cmd_len, transfer_length;
312 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
316 if (conn->session->tt->alloc_pdu) {
317 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
321 hdr = (struct iscsi_scsi_req *)task->hdr;
323 memset(hdr, 0, sizeof(*hdr));
325 if (session->tt->parse_pdu_itt)
326 hdr->itt = task->hdr_itt = itt;
328 hdr->itt = task->hdr_itt = build_itt(task->itt,
329 task->conn->session->age);
331 rc = iscsi_add_hdr(task, sizeof(*hdr));
334 hdr->opcode = ISCSI_OP_SCSI_CMD;
335 hdr->flags = ISCSI_ATTR_SIMPLE;
336 int_to_scsilun(sc->device->lun, &hdr->lun);
337 task->lun = hdr->lun;
338 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
339 cmd_len = sc->cmd_len;
340 if (cmd_len < ISCSI_CDB_SIZE)
341 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
342 else if (cmd_len > ISCSI_CDB_SIZE) {
343 rc = iscsi_prep_ecdb_ahs(task);
346 cmd_len = ISCSI_CDB_SIZE;
348 memcpy(hdr->cdb, sc->cmnd, cmd_len);
351 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
352 task->protected = true;
354 transfer_length = scsi_transfer_length(sc);
355 hdr->data_length = cpu_to_be32(transfer_length);
356 if (sc->sc_data_direction == DMA_TO_DEVICE) {
357 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
359 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
363 * imm_count bytes to be sent right after
366 * unsol_count bytes(as Data-Out) to be sent
367 * without R2T ack right after
370 * r2t data_length bytes to be sent via R2T ack's
372 * pad_count bytes to be sent as zero-padding
374 memset(r2t, 0, sizeof(*r2t));
376 if (session->imm_data_en) {
377 if (transfer_length >= session->first_burst)
378 task->imm_count = min(session->first_burst,
379 conn->max_xmit_dlength);
381 task->imm_count = min(transfer_length,
382 conn->max_xmit_dlength);
383 hton24(hdr->dlength, task->imm_count);
385 zero_data(hdr->dlength);
387 if (!session->initial_r2t_en) {
388 r2t->data_length = min(session->first_burst,
391 r2t->data_offset = task->imm_count;
392 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
393 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
396 if (!task->unsol_r2t.data_length)
397 /* No unsolicit Data-Out's */
398 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
400 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
401 zero_data(hdr->dlength);
403 if (sc->sc_data_direction == DMA_FROM_DEVICE)
404 hdr->flags |= ISCSI_FLAG_CMD_READ;
407 /* calculate size of additional header segments (AHSs) */
408 hdrlength = task->hdr_len - sizeof(*hdr);
410 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
411 hdrlength /= ISCSI_PAD_LEN;
413 WARN_ON(hdrlength >= 256);
414 hdr->hlength = hdrlength & 0xFF;
415 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
417 if (session->tt->init_task && session->tt->init_task(task))
420 task->state = ISCSI_TASK_RUNNING;
423 conn->scsicmd_pdus_cnt++;
424 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
425 "itt 0x%x len %d cmdsn %d win %d]\n",
426 sc->sc_data_direction == DMA_TO_DEVICE ?
427 "write" : "read", conn->id, sc, sc->cmnd[0],
428 task->itt, transfer_length,
430 session->max_cmdsn - session->exp_cmdsn + 1);
435 * iscsi_free_task - free a task
436 * @task: iscsi cmd task
438 * Must be called with session back_lock.
439 * This function returns the scsi command to scsi-ml or cleans
440 * up mgmt tasks then returns the task to the pool.
442 static void iscsi_free_task(struct iscsi_task *task)
444 struct iscsi_conn *conn = task->conn;
445 struct iscsi_session *session = conn->session;
446 struct scsi_cmnd *sc = task->sc;
447 int oldstate = task->state;
449 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
450 task->itt, task->state, task->sc);
452 session->tt->cleanup_task(task);
453 task->state = ISCSI_TASK_FREE;
456 * login task is preallocated so do not free
458 if (conn->login_task == task)
461 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
464 /* SCSI eh reuses commands to verify us */
467 * queue command may call this to free the task, so
468 * it will decide how to return sc to scsi-ml.
470 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
475 void __iscsi_get_task(struct iscsi_task *task)
477 refcount_inc(&task->refcount);
479 EXPORT_SYMBOL_GPL(__iscsi_get_task);
481 void __iscsi_put_task(struct iscsi_task *task)
483 if (refcount_dec_and_test(&task->refcount))
484 iscsi_free_task(task);
486 EXPORT_SYMBOL_GPL(__iscsi_put_task);
488 void iscsi_put_task(struct iscsi_task *task)
490 struct iscsi_session *session = task->conn->session;
492 /* regular RX path uses back_lock */
493 spin_lock_bh(&session->back_lock);
494 __iscsi_put_task(task);
495 spin_unlock_bh(&session->back_lock);
497 EXPORT_SYMBOL_GPL(iscsi_put_task);
500 * iscsi_complete_task - finish a task
501 * @task: iscsi cmd task
502 * @state: state to complete task with
504 * Must be called with session back_lock.
506 static void iscsi_complete_task(struct iscsi_task *task, int state)
508 struct iscsi_conn *conn = task->conn;
510 ISCSI_DBG_SESSION(conn->session,
511 "complete task itt 0x%x state %d sc %p\n",
512 task->itt, task->state, task->sc);
513 if (task->state == ISCSI_TASK_COMPLETED ||
514 task->state == ISCSI_TASK_ABRT_TMF ||
515 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
516 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
518 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
521 if (READ_ONCE(conn->ping_task) == task)
522 WRITE_ONCE(conn->ping_task, NULL);
524 /* release get from queueing */
525 __iscsi_put_task(task);
529 * iscsi_complete_scsi_task - finish scsi task normally
530 * @task: iscsi task for scsi cmd
531 * @exp_cmdsn: expected cmd sn in cpu format
532 * @max_cmdsn: max cmd sn in cpu format
534 * This is used when drivers do not need or cannot perform
535 * lower level pdu processing.
537 * Called with session back_lock
539 void iscsi_complete_scsi_task(struct iscsi_task *task,
540 uint32_t exp_cmdsn, uint32_t max_cmdsn)
542 struct iscsi_conn *conn = task->conn;
544 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
546 conn->last_recv = jiffies;
547 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
548 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
550 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
553 * Must be called with back and frwd lock
555 static bool cleanup_queued_task(struct iscsi_task *task)
557 struct iscsi_conn *conn = task->conn;
558 bool early_complete = false;
560 /* Bad target might have completed task while it was still running */
561 if (task->state == ISCSI_TASK_COMPLETED)
562 early_complete = true;
564 if (!list_empty(&task->running)) {
565 list_del_init(&task->running);
567 * If it's on a list but still running, this could be from
568 * a bad target sending a rsp early, cleanup from a TMF, or
571 if (task->state == ISCSI_TASK_RUNNING ||
572 task->state == ISCSI_TASK_COMPLETED)
573 __iscsi_put_task(task);
576 if (conn->session->running_aborted_task == task) {
577 conn->session->running_aborted_task = NULL;
578 __iscsi_put_task(task);
581 if (conn->task == task) {
583 __iscsi_put_task(task);
586 return early_complete;
590 * session frwd lock must be held and if not called for a task that is still
591 * pending or from the xmit thread, then xmit thread must be suspended
593 static void fail_scsi_task(struct iscsi_task *task, int err)
595 struct iscsi_conn *conn = task->conn;
596 struct scsi_cmnd *sc;
599 spin_lock_bh(&conn->session->back_lock);
600 if (cleanup_queued_task(task)) {
601 spin_unlock_bh(&conn->session->back_lock);
605 if (task->state == ISCSI_TASK_PENDING) {
607 * cmd never made it to the xmit thread, so we should not count
608 * the cmd in the sequencing
610 conn->session->queued_cmdsn--;
611 /* it was never sent so just complete like normal */
612 state = ISCSI_TASK_COMPLETED;
613 } else if (err == DID_TRANSPORT_DISRUPTED)
614 state = ISCSI_TASK_ABRT_SESS_RECOV;
616 state = ISCSI_TASK_ABRT_TMF;
619 sc->result = err << 16;
620 scsi_set_resid(sc, scsi_bufflen(sc));
621 iscsi_complete_task(task, state);
622 spin_unlock_bh(&conn->session->back_lock);
625 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
626 struct iscsi_task *task)
628 struct iscsi_session *session = conn->session;
629 struct iscsi_hdr *hdr = task->hdr;
630 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
631 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
633 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
636 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
637 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
639 * pre-format CmdSN for outgoing PDU.
641 nop->cmdsn = cpu_to_be32(session->cmdsn);
642 if (hdr->itt != RESERVED_ITT) {
644 * TODO: We always use immediate for normal session pdus.
645 * If we start to send tmfs or nops as non-immediate then
646 * we should start checking the cmdsn numbers for mgmt tasks.
648 * During discovery sessions iscsid sends TEXT as non immediate,
649 * but we always only send one PDU at a time.
651 if (conn->c_stage == ISCSI_CONN_STARTED &&
652 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
653 session->queued_cmdsn++;
658 if (session->tt->init_task && session->tt->init_task(task))
661 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
662 session->state = ISCSI_STATE_LOGGING_OUT;
664 task->state = ISCSI_TASK_RUNNING;
665 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
666 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
667 hdr->itt, task->data_count);
671 static struct iscsi_task *
672 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
673 char *data, uint32_t data_size)
675 struct iscsi_session *session = conn->session;
676 struct iscsi_host *ihost = shost_priv(session->host);
677 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
678 struct iscsi_task *task;
681 if (session->state == ISCSI_STATE_TERMINATE)
684 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
686 * Login and Text are sent serially, in
687 * request-followed-by-response sequence.
688 * Same task can be used. Same ITT must be used.
689 * Note that login_task is preallocated at conn_create().
691 if (conn->login_task->state != ISCSI_TASK_FREE) {
692 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
693 "progress. Cannot start new task.\n");
697 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
698 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);
702 task = conn->login_task;
704 if (session->state != ISCSI_STATE_LOGGED_IN)
707 if (data_size != 0) {
708 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
712 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
713 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
715 if (!kfifo_out(&session->cmdpool.queue,
716 (void*)&task, sizeof(void*)))
720 * released in complete pdu for task we expect a response for, and
721 * released by the lld when it has transmitted the task for
722 * pdus we do not expect a response for.
724 refcount_set(&task->refcount, 1);
727 INIT_LIST_HEAD(&task->running);
728 task->state = ISCSI_TASK_PENDING;
731 memcpy(task->data, data, data_size);
732 task->data_count = data_size;
734 task->data_count = 0;
736 if (conn->session->tt->alloc_pdu) {
737 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
738 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
739 "pdu for mgmt task.\n");
744 itt = task->hdr->itt;
745 task->hdr_len = sizeof(struct iscsi_hdr);
746 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
748 if (hdr->itt != RESERVED_ITT) {
749 if (session->tt->parse_pdu_itt)
750 task->hdr->itt = itt;
752 task->hdr->itt = build_itt(task->itt,
753 task->conn->session->age);
756 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK))
757 WRITE_ONCE(conn->ping_task, task);
760 if (iscsi_prep_mgmt_task(conn, task))
763 if (session->tt->xmit_task(task))
766 list_add_tail(&task->running, &conn->mgmtqueue);
767 iscsi_conn_queue_work(conn);
773 /* regular RX path uses back_lock */
774 spin_lock(&session->back_lock);
775 __iscsi_put_task(task);
776 spin_unlock(&session->back_lock);
780 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
781 char *data, uint32_t data_size)
783 struct iscsi_conn *conn = cls_conn->dd_data;
784 struct iscsi_session *session = conn->session;
787 spin_lock_bh(&session->frwd_lock);
788 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
790 spin_unlock_bh(&session->frwd_lock);
793 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
796 * iscsi_scsi_cmd_rsp - SCSI Command Response processing
797 * @conn: iscsi connection
799 * @task: scsi command task
800 * @data: cmd data buffer
801 * @datalen: len of buffer
803 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
804 * then completes the command and task. called under back_lock
806 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
807 struct iscsi_task *task, char *data,
810 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
811 struct iscsi_session *session = conn->session;
812 struct scsi_cmnd *sc = task->sc;
814 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
815 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
817 sc->result = (DID_OK << 16) | rhdr->cmd_status;
819 if (task->protected) {
824 * Transports that didn't implement check_protection
825 * callback but still published T10-PI support to scsi-mid
826 * deserve this BUG_ON.
828 BUG_ON(!session->tt->check_protection);
830 ascq = session->tt->check_protection(task, §or);
832 scsi_build_sense(sc, 1, ILLEGAL_REQUEST, 0x10, ascq);
833 scsi_set_sense_information(sc->sense_buffer,
834 SCSI_SENSE_BUFFERSIZE,
840 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
841 sc->result = DID_ERROR << 16;
845 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
850 iscsi_conn_printk(KERN_ERR, conn,
851 "Got CHECK_CONDITION but invalid data "
852 "buffer size of %d\n", datalen);
853 sc->result = DID_BAD_TARGET << 16;
857 senselen = get_unaligned_be16(data);
858 if (datalen < senselen)
859 goto invalid_datalen;
861 memcpy(sc->sense_buffer, data + 2,
862 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
863 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
864 min_t(uint16_t, senselen,
865 SCSI_SENSE_BUFFERSIZE));
868 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
869 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
870 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
873 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
874 ISCSI_FLAG_CMD_OVERFLOW)) {
875 int res_count = be32_to_cpu(rhdr->residual_count);
878 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
879 res_count <= scsi_bufflen(sc)))
880 /* write side for bidi or uni-io set_resid */
881 scsi_set_resid(sc, res_count);
883 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
886 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
887 sc, sc->result, task->itt);
888 conn->scsirsp_pdus_cnt++;
889 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
893 * iscsi_data_in_rsp - SCSI Data-In Response processing
894 * @conn: iscsi connection
896 * @task: scsi command task
898 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received
899 * then completes the command and task. called under back_lock
902 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
903 struct iscsi_task *task)
905 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
906 struct scsi_cmnd *sc = task->sc;
908 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
911 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
912 sc->result = (DID_OK << 16) | rhdr->cmd_status;
913 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
914 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
915 ISCSI_FLAG_DATA_OVERFLOW)) {
916 int res_count = be32_to_cpu(rhdr->residual_count);
919 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
920 res_count <= sc->sdb.length))
921 scsi_set_resid(sc, res_count);
923 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
926 ISCSI_DBG_SESSION(conn->session, "data in with status done "
927 "[sc %p res %d itt 0x%x]\n",
928 sc, sc->result, task->itt);
929 conn->scsirsp_pdus_cnt++;
930 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
933 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
935 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
936 struct iscsi_session *session = conn->session;
938 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
939 conn->tmfrsp_pdus_cnt++;
941 if (session->tmf_state != TMF_QUEUED)
944 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
945 session->tmf_state = TMF_SUCCESS;
946 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
947 session->tmf_state = TMF_NOT_FOUND;
949 session->tmf_state = TMF_FAILED;
950 wake_up(&session->ehwait);
953 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
955 struct iscsi_nopout hdr;
956 struct iscsi_task *task;
959 if (READ_ONCE(conn->ping_task))
961 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK);
964 memset(&hdr, 0, sizeof(struct iscsi_nopout));
965 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
966 hdr.flags = ISCSI_FLAG_CMD_FINAL;
971 hdr.itt = RESERVED_ITT;
973 hdr.ttt = RESERVED_ITT;
975 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
978 WRITE_ONCE(conn->ping_task, NULL);
979 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
982 /* only track our nops */
983 conn->last_ping = jiffies;
990 * iscsi_nop_out_rsp - SCSI NOP Response processing
991 * @task: scsi command task
992 * @nop: the nop structure
993 * @data: where to put the data
994 * @datalen: length of data
996 * iscsi_nop_out_rsp handles nop response from use or
997 * from user space. called under back_lock
999 static int iscsi_nop_out_rsp(struct iscsi_task *task,
1000 struct iscsi_nopin *nop, char *data, int datalen)
1002 struct iscsi_conn *conn = task->conn;
1005 if (READ_ONCE(conn->ping_task) != task) {
1007 * If this is not in response to one of our
1008 * nops then it must be from userspace.
1010 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1012 rc = ISCSI_ERR_CONN_FAILED;
1014 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1015 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1019 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1020 char *data, int datalen)
1022 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1023 struct iscsi_hdr rejected_pdu;
1026 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1028 if (ntoh24(reject->dlength) > datalen ||
1029 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1030 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1031 "pdu. Invalid data length (pdu dlength "
1032 "%u, datalen %d\n", ntoh24(reject->dlength),
1034 return ISCSI_ERR_PROTO;
1036 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1037 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1039 switch (reject->reason) {
1040 case ISCSI_REASON_DATA_DIGEST_ERROR:
1041 iscsi_conn_printk(KERN_ERR, conn,
1042 "pdu (op 0x%x itt 0x%x) rejected "
1043 "due to DataDigest error.\n",
1044 opcode, rejected_pdu.itt);
1046 case ISCSI_REASON_IMM_CMD_REJECT:
1047 iscsi_conn_printk(KERN_ERR, conn,
1048 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1049 "immediate commands.\n",
1050 opcode, rejected_pdu.itt);
1052 * We only send one TMF at a time so if the target could not
1053 * handle it, then it should get fixed (RFC mandates that
1054 * a target can handle one immediate TMF per conn).
1056 * For nops-outs, we could have sent more than one if
1057 * the target is sending us lots of nop-ins
1059 if (opcode != ISCSI_OP_NOOP_OUT)
1062 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1064 * nop-out in response to target's nop-out rejected.
1067 /* In RX path we are under back lock */
1068 spin_unlock(&conn->session->back_lock);
1069 spin_lock(&conn->session->frwd_lock);
1070 iscsi_send_nopout(conn,
1071 (struct iscsi_nopin*)&rejected_pdu);
1072 spin_unlock(&conn->session->frwd_lock);
1073 spin_lock(&conn->session->back_lock);
1075 struct iscsi_task *task;
1077 * Our nop as ping got dropped. We know the target
1078 * and transport are ok so just clean up
1080 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1082 iscsi_conn_printk(KERN_ERR, conn,
1083 "Invalid pdu reject. Could "
1084 "not lookup rejected task.\n");
1085 rc = ISCSI_ERR_BAD_ITT;
1087 rc = iscsi_nop_out_rsp(task,
1088 (struct iscsi_nopin*)&rejected_pdu,
1093 iscsi_conn_printk(KERN_ERR, conn,
1094 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1095 "code 0x%x\n", rejected_pdu.opcode,
1096 rejected_pdu.itt, reject->reason);
1103 * iscsi_itt_to_task - look up task by itt
1104 * @conn: iscsi connection
1107 * This should be used for mgmt tasks like login and nops, or if
1108 * the LDD's itt space does not include the session age.
1110 * The session back_lock must be held.
1112 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1114 struct iscsi_session *session = conn->session;
1117 if (itt == RESERVED_ITT)
1120 if (session->tt->parse_pdu_itt)
1121 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1124 if (i >= session->cmds_max)
1127 return session->cmds[i];
1129 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1132 * __iscsi_complete_pdu - complete pdu
1134 * @hdr: iscsi header
1135 * @data: data buffer
1136 * @datalen: len of data buffer
1138 * Completes pdu processing by freeing any resources allocated at
1139 * queuecommand or send generic. session back_lock must be held and verify
1140 * itt must have been called.
1142 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1143 char *data, int datalen)
1145 struct iscsi_session *session = conn->session;
1146 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1147 struct iscsi_task *task;
1150 conn->last_recv = jiffies;
1151 rc = iscsi_verify_itt(conn, hdr->itt);
1155 if (hdr->itt != RESERVED_ITT)
1156 itt = get_itt(hdr->itt);
1160 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1161 opcode, conn->id, itt, datalen);
1164 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1167 case ISCSI_OP_NOOP_IN:
1169 rc = ISCSI_ERR_PROTO;
1173 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1176 /* In RX path we are under back lock */
1177 spin_unlock(&session->back_lock);
1178 spin_lock(&session->frwd_lock);
1179 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1180 spin_unlock(&session->frwd_lock);
1181 spin_lock(&session->back_lock);
1183 case ISCSI_OP_REJECT:
1184 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1186 case ISCSI_OP_ASYNC_EVENT:
1187 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1188 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1189 rc = ISCSI_ERR_CONN_FAILED;
1192 rc = ISCSI_ERR_BAD_OPCODE;
1199 case ISCSI_OP_SCSI_CMD_RSP:
1200 case ISCSI_OP_SCSI_DATA_IN:
1201 task = iscsi_itt_to_ctask(conn, hdr->itt);
1203 return ISCSI_ERR_BAD_ITT;
1204 task->last_xfer = jiffies;
1208 * LLD handles R2Ts if they need to.
1211 case ISCSI_OP_LOGOUT_RSP:
1212 case ISCSI_OP_LOGIN_RSP:
1213 case ISCSI_OP_TEXT_RSP:
1214 case ISCSI_OP_SCSI_TMFUNC_RSP:
1215 case ISCSI_OP_NOOP_IN:
1216 task = iscsi_itt_to_task(conn, hdr->itt);
1218 return ISCSI_ERR_BAD_ITT;
1221 return ISCSI_ERR_BAD_OPCODE;
1225 case ISCSI_OP_SCSI_CMD_RSP:
1226 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1228 case ISCSI_OP_SCSI_DATA_IN:
1229 iscsi_data_in_rsp(conn, hdr, task);
1231 case ISCSI_OP_LOGOUT_RSP:
1232 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1234 rc = ISCSI_ERR_PROTO;
1237 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1239 case ISCSI_OP_LOGIN_RSP:
1240 case ISCSI_OP_TEXT_RSP:
1241 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1243 * login related PDU's exp_statsn is handled in
1247 case ISCSI_OP_SCSI_TMFUNC_RSP:
1248 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1250 rc = ISCSI_ERR_PROTO;
1254 iscsi_tmf_rsp(conn, hdr);
1255 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1257 case ISCSI_OP_NOOP_IN:
1258 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1259 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1260 rc = ISCSI_ERR_PROTO;
1263 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1265 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1269 rc = ISCSI_ERR_BAD_OPCODE;
1276 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1277 rc = ISCSI_ERR_CONN_FAILED;
1278 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1281 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1283 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1284 char *data, int datalen)
1288 spin_lock(&conn->session->back_lock);
1289 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1290 spin_unlock(&conn->session->back_lock);
1293 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1295 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1297 struct iscsi_session *session = conn->session;
1300 if (itt == RESERVED_ITT)
1303 if (session->tt->parse_pdu_itt)
1304 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1307 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1310 if (age != session->age) {
1311 iscsi_conn_printk(KERN_ERR, conn,
1312 "received itt %x expected session age (%x)\n",
1313 (__force u32)itt, session->age);
1314 return ISCSI_ERR_BAD_ITT;
1317 if (i >= session->cmds_max) {
1318 iscsi_conn_printk(KERN_ERR, conn,
1319 "received invalid itt index %u (max cmds "
1320 "%u.\n", i, session->cmds_max);
1321 return ISCSI_ERR_BAD_ITT;
1325 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1328 * iscsi_itt_to_ctask - look up ctask by itt
1329 * @conn: iscsi connection
1332 * This should be used for cmd tasks.
1334 * The session back_lock must be held.
1336 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1338 struct iscsi_task *task;
1340 if (iscsi_verify_itt(conn, itt))
1343 task = iscsi_itt_to_task(conn, itt);
1344 if (!task || !task->sc)
1347 if (task->sc->SCp.phase != conn->session->age) {
1348 iscsi_session_printk(KERN_ERR, conn->session,
1349 "task's session age %d, expected %d\n",
1350 task->sc->SCp.phase, conn->session->age);
1356 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1358 void iscsi_session_failure(struct iscsi_session *session,
1361 struct iscsi_conn *conn;
1363 spin_lock_bh(&session->frwd_lock);
1364 conn = session->leadconn;
1365 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1366 spin_unlock_bh(&session->frwd_lock);
1370 iscsi_get_conn(conn->cls_conn);
1371 spin_unlock_bh(&session->frwd_lock);
1373 * if the host is being removed bypass the connection
1374 * recovery initialization because we are going to kill
1377 if (err == ISCSI_ERR_INVALID_HOST)
1378 iscsi_conn_error_event(conn->cls_conn, err);
1380 iscsi_conn_failure(conn, err);
1381 iscsi_put_conn(conn->cls_conn);
1383 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1385 static bool iscsi_set_conn_failed(struct iscsi_conn *conn)
1387 struct iscsi_session *session = conn->session;
1389 if (session->state == ISCSI_STATE_FAILED)
1392 if (conn->stop_stage == 0)
1393 session->state = ISCSI_STATE_FAILED;
1395 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1396 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1400 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1402 struct iscsi_session *session = conn->session;
1405 spin_lock_bh(&session->frwd_lock);
1406 needs_evt = iscsi_set_conn_failed(conn);
1407 spin_unlock_bh(&session->frwd_lock);
1410 iscsi_conn_error_event(conn->cls_conn, err);
1412 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1414 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1416 struct iscsi_session *session = conn->session;
1419 * Check for iSCSI window and take care of CmdSN wrap-around
1421 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1422 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1423 "%u MaxCmdSN %u CmdSN %u/%u\n",
1424 session->exp_cmdsn, session->max_cmdsn,
1425 session->cmdsn, session->queued_cmdsn);
1431 static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task,
1436 spin_lock_bh(&conn->session->back_lock);
1439 /* Take a ref so we can access it after xmit_task() */
1440 __iscsi_get_task(task);
1442 /* Already have a ref from when we failed to send it last call */
1447 * If this was a requeue for a R2T we have an extra ref on the task in
1448 * case a bad target sends a cmd rsp before we have handled the task.
1451 __iscsi_put_task(task);
1454 * Do this after dropping the extra ref because if this was a requeue
1455 * it's removed from that list and cleanup_queued_task would miss it.
1457 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1459 * Save the task and ref in case we weren't cleaning up this
1460 * task and get woken up again.
1463 spin_unlock_bh(&conn->session->back_lock);
1466 spin_unlock_bh(&conn->session->back_lock);
1468 spin_unlock_bh(&conn->session->frwd_lock);
1469 rc = conn->session->tt->xmit_task(task);
1470 spin_lock_bh(&conn->session->frwd_lock);
1472 /* done with this task */
1473 task->last_xfer = jiffies;
1475 /* regular RX path uses back_lock */
1476 spin_lock(&conn->session->back_lock);
1477 if (rc && task->state == ISCSI_TASK_RUNNING) {
1479 * get an extra ref that is released next time we access it
1480 * as conn->task above.
1482 __iscsi_get_task(task);
1486 __iscsi_put_task(task);
1487 spin_unlock(&conn->session->back_lock);
1492 * iscsi_requeue_task - requeue task to run from session workqueue
1493 * @task: task to requeue
1495 * Callers must have taken a ref to the task that is going to be requeued.
1497 void iscsi_requeue_task(struct iscsi_task *task)
1499 struct iscsi_conn *conn = task->conn;
1502 * this may be on the requeue list already if the xmit_task callout
1503 * is handling the r2ts while we are adding new ones
1505 spin_lock_bh(&conn->session->frwd_lock);
1506 if (list_empty(&task->running)) {
1507 list_add_tail(&task->running, &conn->requeue);
1510 * Don't need the extra ref since it's already requeued and
1513 iscsi_put_task(task);
1515 iscsi_conn_queue_work(conn);
1516 spin_unlock_bh(&conn->session->frwd_lock);
1518 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1521 * iscsi_data_xmit - xmit any command into the scheduled connection
1522 * @conn: iscsi connection
1525 * The function can return -EAGAIN in which case the caller must
1526 * re-schedule it again later or recover. '0' return code means
1529 static int iscsi_data_xmit(struct iscsi_conn *conn)
1531 struct iscsi_task *task;
1534 spin_lock_bh(&conn->session->frwd_lock);
1535 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1536 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1537 spin_unlock_bh(&conn->session->frwd_lock);
1542 rc = iscsi_xmit_task(conn, conn->task, false);
1548 * process mgmt pdus like nops before commands since we should
1549 * only have one nop-out as a ping from us and targets should not
1550 * overflow us with nop-ins
1553 while (!list_empty(&conn->mgmtqueue)) {
1554 task = list_entry(conn->mgmtqueue.next, struct iscsi_task,
1556 list_del_init(&task->running);
1557 if (iscsi_prep_mgmt_task(conn, task)) {
1558 /* regular RX path uses back_lock */
1559 spin_lock_bh(&conn->session->back_lock);
1560 __iscsi_put_task(task);
1561 spin_unlock_bh(&conn->session->back_lock);
1564 rc = iscsi_xmit_task(conn, task, false);
1569 /* process pending command queue */
1570 while (!list_empty(&conn->cmdqueue)) {
1571 task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1573 list_del_init(&task->running);
1574 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1575 fail_scsi_task(task, DID_IMM_RETRY);
1578 rc = iscsi_prep_scsi_cmd_pdu(task);
1580 if (rc == -ENOMEM || rc == -EACCES)
1581 fail_scsi_task(task, DID_IMM_RETRY);
1583 fail_scsi_task(task, DID_ABORT);
1586 rc = iscsi_xmit_task(conn, task, false);
1590 * we could continuously get new task requests so
1591 * we need to check the mgmt queue for nops that need to
1592 * be sent to aviod starvation
1594 if (!list_empty(&conn->mgmtqueue))
1598 while (!list_empty(&conn->requeue)) {
1600 * we always do fastlogout - conn stop code will clean up.
1602 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1605 task = list_entry(conn->requeue.next, struct iscsi_task,
1608 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1611 list_del_init(&task->running);
1612 rc = iscsi_xmit_task(conn, task, true);
1615 if (!list_empty(&conn->mgmtqueue))
1618 spin_unlock_bh(&conn->session->frwd_lock);
1622 spin_unlock_bh(&conn->session->frwd_lock);
1626 static void iscsi_xmitworker(struct work_struct *work)
1628 struct iscsi_conn *conn =
1629 container_of(work, struct iscsi_conn, xmitwork);
1632 * serialize Xmit worker on a per-connection basis.
1635 rc = iscsi_data_xmit(conn);
1636 } while (rc >= 0 || rc == -EAGAIN);
1639 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1640 struct scsi_cmnd *sc)
1642 struct iscsi_task *task;
1644 if (!kfifo_out(&conn->session->cmdpool.queue,
1645 (void *) &task, sizeof(void *)))
1648 sc->SCp.phase = conn->session->age;
1649 sc->SCp.ptr = (char *) task;
1651 refcount_set(&task->refcount, 1);
1652 task->state = ISCSI_TASK_PENDING;
1655 task->have_checked_conn = false;
1656 task->last_timeout = jiffies;
1657 task->last_xfer = jiffies;
1658 task->protected = false;
1659 INIT_LIST_HEAD(&task->running);
1664 FAILURE_BAD_HOST = 1,
1665 FAILURE_SESSION_FAILED,
1666 FAILURE_SESSION_FREED,
1667 FAILURE_WINDOW_CLOSED,
1669 FAILURE_SESSION_TERMINATE,
1670 FAILURE_SESSION_IN_RECOVERY,
1671 FAILURE_SESSION_RECOVERY_TIMEOUT,
1672 FAILURE_SESSION_LOGGING_OUT,
1673 FAILURE_SESSION_NOT_READY,
1676 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1678 struct iscsi_cls_session *cls_session;
1679 struct iscsi_host *ihost;
1681 struct iscsi_session *session;
1682 struct iscsi_conn *conn;
1683 struct iscsi_task *task = NULL;
1688 ihost = shost_priv(host);
1690 cls_session = starget_to_session(scsi_target(sc->device));
1691 session = cls_session->dd_data;
1692 spin_lock_bh(&session->frwd_lock);
1694 reason = iscsi_session_chkready(cls_session);
1696 sc->result = reason;
1700 if (session->state != ISCSI_STATE_LOGGED_IN) {
1702 * to handle the race between when we set the recovery state
1703 * and block the session we requeue here (commands could
1704 * be entering our queuecommand while a block is starting
1705 * up because the block code is not locked)
1707 switch (session->state) {
1708 case ISCSI_STATE_FAILED:
1710 * cmds should fail during shutdown, if the session
1711 * state is bad, allowing completion to happen
1713 if (unlikely(system_state != SYSTEM_RUNNING)) {
1714 reason = FAILURE_SESSION_FAILED;
1715 sc->result = DID_NO_CONNECT << 16;
1719 case ISCSI_STATE_IN_RECOVERY:
1720 reason = FAILURE_SESSION_IN_RECOVERY;
1721 sc->result = DID_IMM_RETRY << 16;
1723 case ISCSI_STATE_LOGGING_OUT:
1724 reason = FAILURE_SESSION_LOGGING_OUT;
1725 sc->result = DID_IMM_RETRY << 16;
1727 case ISCSI_STATE_RECOVERY_FAILED:
1728 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1729 sc->result = DID_TRANSPORT_FAILFAST << 16;
1731 case ISCSI_STATE_TERMINATE:
1732 reason = FAILURE_SESSION_TERMINATE;
1733 sc->result = DID_NO_CONNECT << 16;
1736 reason = FAILURE_SESSION_FREED;
1737 sc->result = DID_NO_CONNECT << 16;
1742 conn = session->leadconn;
1744 reason = FAILURE_SESSION_FREED;
1745 sc->result = DID_NO_CONNECT << 16;
1749 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1750 reason = FAILURE_SESSION_IN_RECOVERY;
1751 sc->result = DID_REQUEUE << 16;
1755 if (iscsi_check_cmdsn_window_closed(conn)) {
1756 reason = FAILURE_WINDOW_CLOSED;
1760 task = iscsi_alloc_task(conn, sc);
1762 reason = FAILURE_OOM;
1766 if (!ihost->workq) {
1767 reason = iscsi_prep_scsi_cmd_pdu(task);
1769 if (reason == -ENOMEM || reason == -EACCES) {
1770 reason = FAILURE_OOM;
1773 sc->result = DID_ABORT << 16;
1777 if (session->tt->xmit_task(task)) {
1779 reason = FAILURE_SESSION_NOT_READY;
1783 list_add_tail(&task->running, &conn->cmdqueue);
1784 iscsi_conn_queue_work(conn);
1787 session->queued_cmdsn++;
1788 spin_unlock_bh(&session->frwd_lock);
1792 spin_lock_bh(&session->back_lock);
1793 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1794 spin_unlock_bh(&session->back_lock);
1796 spin_unlock_bh(&session->frwd_lock);
1797 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1798 sc->cmnd[0], reason);
1799 return SCSI_MLQUEUE_TARGET_BUSY;
1802 spin_lock_bh(&session->back_lock);
1803 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1804 spin_unlock_bh(&session->back_lock);
1806 spin_unlock_bh(&session->frwd_lock);
1807 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1808 sc->cmnd[0], reason);
1809 scsi_set_resid(sc, scsi_bufflen(sc));
1813 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1815 int iscsi_target_alloc(struct scsi_target *starget)
1817 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1818 struct iscsi_session *session = cls_session->dd_data;
1820 starget->can_queue = session->scsi_cmds_max;
1823 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1825 static void iscsi_tmf_timedout(struct timer_list *t)
1827 struct iscsi_session *session = from_timer(session, t, tmf_timer);
1829 spin_lock(&session->frwd_lock);
1830 if (session->tmf_state == TMF_QUEUED) {
1831 session->tmf_state = TMF_TIMEDOUT;
1832 ISCSI_DBG_EH(session, "tmf timedout\n");
1833 /* unblock eh_abort() */
1834 wake_up(&session->ehwait);
1836 spin_unlock(&session->frwd_lock);
1839 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1840 struct iscsi_tm *hdr, int age,
1842 __must_hold(&session->frwd_lock)
1844 struct iscsi_session *session = conn->session;
1845 struct iscsi_task *task;
1847 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1850 spin_unlock_bh(&session->frwd_lock);
1851 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1852 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1853 spin_lock_bh(&session->frwd_lock);
1856 conn->tmfcmd_pdus_cnt++;
1857 session->tmf_timer.expires = timeout * HZ + jiffies;
1858 add_timer(&session->tmf_timer);
1859 ISCSI_DBG_EH(session, "tmf set timeout\n");
1861 spin_unlock_bh(&session->frwd_lock);
1862 mutex_unlock(&session->eh_mutex);
1865 * block eh thread until:
1869 * 3) session is terminated or restarted or userspace has
1870 * given up on recovery
1872 wait_event_interruptible(session->ehwait, age != session->age ||
1873 session->state != ISCSI_STATE_LOGGED_IN ||
1874 session->tmf_state != TMF_QUEUED);
1875 if (signal_pending(current))
1876 flush_signals(current);
1877 del_timer_sync(&session->tmf_timer);
1879 mutex_lock(&session->eh_mutex);
1880 spin_lock_bh(&session->frwd_lock);
1881 /* if the session drops it will clean up the task */
1882 if (age != session->age ||
1883 session->state != ISCSI_STATE_LOGGED_IN)
1889 * Fail commands. session frwd lock held and xmit thread flushed.
1891 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1893 struct iscsi_session *session = conn->session;
1894 struct iscsi_task *task;
1897 spin_lock_bh(&session->back_lock);
1898 for (i = 0; i < session->cmds_max; i++) {
1899 task = session->cmds[i];
1900 if (!task->sc || task->state == ISCSI_TASK_FREE)
1903 if (lun != -1 && lun != task->sc->device->lun)
1906 __iscsi_get_task(task);
1907 spin_unlock_bh(&session->back_lock);
1909 ISCSI_DBG_SESSION(session,
1910 "failing sc %p itt 0x%x state %d\n",
1911 task->sc, task->itt, task->state);
1912 fail_scsi_task(task, error);
1914 spin_unlock_bh(&session->frwd_lock);
1915 iscsi_put_task(task);
1916 spin_lock_bh(&session->frwd_lock);
1918 spin_lock_bh(&session->back_lock);
1921 spin_unlock_bh(&session->back_lock);
1925 * iscsi_suspend_queue - suspend iscsi_queuecommand
1926 * @conn: iscsi conn to stop queueing IO on
1928 * This grabs the session frwd_lock to make sure no one is in
1929 * xmit_task/queuecommand, and then sets suspend to prevent
1930 * new commands from being queued. This only needs to be called
1931 * by offload drivers that need to sync a path like ep disconnect
1932 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1933 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1935 void iscsi_suspend_queue(struct iscsi_conn *conn)
1937 spin_lock_bh(&conn->session->frwd_lock);
1938 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1939 spin_unlock_bh(&conn->session->frwd_lock);
1941 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1944 * iscsi_suspend_tx - suspend iscsi_data_xmit
1945 * @conn: iscsi conn tp stop processing IO on.
1947 * This function sets the suspend bit to prevent iscsi_data_xmit
1948 * from sending new IO, and if work is queued on the xmit thread
1949 * it will wait for it to be completed.
1951 void iscsi_suspend_tx(struct iscsi_conn *conn)
1953 struct Scsi_Host *shost = conn->session->host;
1954 struct iscsi_host *ihost = shost_priv(shost);
1956 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1958 flush_workqueue(ihost->workq);
1960 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1962 static void iscsi_start_tx(struct iscsi_conn *conn)
1964 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1965 iscsi_conn_queue_work(conn);
1969 * We want to make sure a ping is in flight. It has timed out.
1970 * And we are not busy processing a pdu that is making
1971 * progress but got started before the ping and is taking a while
1972 * to complete so the ping is just stuck behind it in a queue.
1974 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1976 if (READ_ONCE(conn->ping_task) &&
1977 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1978 (conn->ping_timeout * HZ), jiffies))
1984 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1986 enum blk_eh_timer_return rc = BLK_EH_DONE;
1987 struct iscsi_task *task = NULL, *running_task;
1988 struct iscsi_cls_session *cls_session;
1989 struct iscsi_session *session;
1990 struct iscsi_conn *conn;
1993 cls_session = starget_to_session(scsi_target(sc->device));
1994 session = cls_session->dd_data;
1996 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1998 spin_lock_bh(&session->frwd_lock);
1999 spin_lock(&session->back_lock);
2000 task = (struct iscsi_task *)sc->SCp.ptr;
2003 * Raced with completion. Blk layer has taken ownership
2004 * so let timeout code complete it now.
2007 spin_unlock(&session->back_lock);
2010 __iscsi_get_task(task);
2011 spin_unlock(&session->back_lock);
2013 if (session->state != ISCSI_STATE_LOGGED_IN) {
2015 * During shutdown, if session is prematurely disconnected,
2016 * recovery won't happen and there will be hung cmds. Not
2017 * handling cmds would trigger EH, also bad in this case.
2018 * Instead, handle cmd, allow completion to happen and let
2019 * upper layer to deal with the result.
2021 if (unlikely(system_state != SYSTEM_RUNNING)) {
2022 sc->result = DID_NO_CONNECT << 16;
2023 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2028 * We are probably in the middle of iscsi recovery so let
2029 * that complete and handle the error.
2031 rc = BLK_EH_RESET_TIMER;
2035 conn = session->leadconn;
2037 /* In the middle of shuting down */
2038 rc = BLK_EH_RESET_TIMER;
2043 * If we have sent (at least queued to the network layer) a pdu or
2044 * recvd one for the task since the last timeout ask for
2045 * more time. If on the next timeout we have not made progress
2046 * we can check if it is the task or connection when we send the
2049 if (time_after(task->last_xfer, task->last_timeout)) {
2050 ISCSI_DBG_EH(session, "Command making progress. Asking "
2051 "scsi-ml for more time to complete. "
2052 "Last data xfer at %lu. Last timeout was at "
2053 "%lu\n.", task->last_xfer, task->last_timeout);
2054 task->have_checked_conn = false;
2055 rc = BLK_EH_RESET_TIMER;
2059 if (!conn->recv_timeout && !conn->ping_timeout)
2062 * if the ping timedout then we are in the middle of cleaning up
2063 * and can let the iscsi eh handle it
2065 if (iscsi_has_ping_timed_out(conn)) {
2066 rc = BLK_EH_RESET_TIMER;
2070 spin_lock(&session->back_lock);
2071 for (i = 0; i < conn->session->cmds_max; i++) {
2072 running_task = conn->session->cmds[i];
2073 if (!running_task->sc || running_task == task ||
2074 running_task->state != ISCSI_TASK_RUNNING)
2078 * Only check if cmds started before this one have made
2079 * progress, or this could never fail
2081 if (time_after(running_task->sc->jiffies_at_alloc,
2082 task->sc->jiffies_at_alloc))
2085 if (time_after(running_task->last_xfer, task->last_timeout)) {
2087 * This task has not made progress, but a task
2088 * started before us has transferred data since
2089 * we started/last-checked. We could be queueing
2090 * too many tasks or the LU is bad.
2092 * If the device is bad the cmds ahead of us on
2093 * other devs will complete, and this loop will
2094 * eventually fail starting the scsi eh.
2096 ISCSI_DBG_EH(session, "Command has not made progress "
2097 "but commands ahead of it have. "
2098 "Asking scsi-ml for more time to "
2099 "complete. Our last xfer vs running task "
2100 "last xfer %lu/%lu. Last check %lu.\n",
2101 task->last_xfer, running_task->last_xfer,
2102 task->last_timeout);
2103 spin_unlock(&session->back_lock);
2104 rc = BLK_EH_RESET_TIMER;
2108 spin_unlock(&session->back_lock);
2110 /* Assumes nop timeout is shorter than scsi cmd timeout */
2111 if (task->have_checked_conn)
2115 * Checking the transport already or nop from a cmd timeout still
2118 if (READ_ONCE(conn->ping_task)) {
2119 task->have_checked_conn = true;
2120 rc = BLK_EH_RESET_TIMER;
2124 /* Make sure there is a transport check done */
2125 iscsi_send_nopout(conn, NULL);
2126 task->have_checked_conn = true;
2127 rc = BLK_EH_RESET_TIMER;
2130 spin_unlock_bh(&session->frwd_lock);
2133 task->last_timeout = jiffies;
2134 iscsi_put_task(task);
2136 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2137 "timer reset" : "shutdown or nh");
2140 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2142 static void iscsi_check_transport_timeouts(struct timer_list *t)
2144 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
2145 struct iscsi_session *session = conn->session;
2146 unsigned long recv_timeout, next_timeout = 0, last_recv;
2148 spin_lock(&session->frwd_lock);
2149 if (session->state != ISCSI_STATE_LOGGED_IN)
2152 recv_timeout = conn->recv_timeout;
2157 last_recv = conn->last_recv;
2159 if (iscsi_has_ping_timed_out(conn)) {
2160 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2161 "expired, recv timeout %d, last rx %lu, "
2162 "last ping %lu, now %lu\n",
2163 conn->ping_timeout, conn->recv_timeout,
2164 last_recv, conn->last_ping, jiffies);
2165 spin_unlock(&session->frwd_lock);
2166 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2170 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2171 /* send a ping to try to provoke some traffic */
2172 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2173 if (iscsi_send_nopout(conn, NULL))
2174 next_timeout = jiffies + (1 * HZ);
2176 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2178 next_timeout = last_recv + recv_timeout;
2180 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2181 mod_timer(&conn->transport_timer, next_timeout);
2183 spin_unlock(&session->frwd_lock);
2187 * iscsi_conn_unbind - prevent queueing to conn.
2188 * @cls_conn: iscsi conn ep is bound to.
2189 * @is_active: is the conn in use for boot or is this for EH/termination
2191 * This must be called by drivers implementing the ep_disconnect callout.
2192 * It disables queueing to the connection from libiscsi in preparation for
2193 * an ep_disconnect call.
2195 void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active)
2197 struct iscsi_session *session;
2198 struct iscsi_conn *conn;
2203 conn = cls_conn->dd_data;
2204 session = conn->session;
2206 * Wait for iscsi_eh calls to exit. We don't wait for the tmf to
2207 * complete or timeout. The caller just wants to know what's running
2208 * is everything that needs to be cleaned up, and no cmds will be
2211 mutex_lock(&session->eh_mutex);
2213 iscsi_suspend_queue(conn);
2214 iscsi_suspend_tx(conn);
2216 spin_lock_bh(&session->frwd_lock);
2219 * if logout timed out before userspace could even send a PDU
2220 * the state might still be in ISCSI_STATE_LOGGED_IN and
2221 * allowing new cmds and TMFs.
2223 if (session->state == ISCSI_STATE_LOGGED_IN)
2224 iscsi_set_conn_failed(conn);
2226 spin_unlock_bh(&session->frwd_lock);
2227 mutex_unlock(&session->eh_mutex);
2229 EXPORT_SYMBOL_GPL(iscsi_conn_unbind);
2231 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2232 struct iscsi_tm *hdr)
2234 memset(hdr, 0, sizeof(*hdr));
2235 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2236 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2237 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2238 hdr->lun = task->lun;
2239 hdr->rtt = task->hdr_itt;
2240 hdr->refcmdsn = task->cmdsn;
2243 int iscsi_eh_abort(struct scsi_cmnd *sc)
2245 struct iscsi_cls_session *cls_session;
2246 struct iscsi_session *session;
2247 struct iscsi_conn *conn;
2248 struct iscsi_task *task;
2249 struct iscsi_tm *hdr;
2252 cls_session = starget_to_session(scsi_target(sc->device));
2253 session = cls_session->dd_data;
2255 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2257 mutex_lock(&session->eh_mutex);
2258 spin_lock_bh(&session->frwd_lock);
2260 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2264 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2266 spin_unlock_bh(&session->frwd_lock);
2267 mutex_unlock(&session->eh_mutex);
2272 * If we are not logged in or we have started a new session
2273 * then let the host reset code handle this
2275 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2276 sc->SCp.phase != session->age) {
2277 spin_unlock_bh(&session->frwd_lock);
2278 mutex_unlock(&session->eh_mutex);
2279 ISCSI_DBG_EH(session, "failing abort due to dropped "
2284 conn = session->leadconn;
2285 iscsi_get_conn(conn->cls_conn);
2286 conn->eh_abort_cnt++;
2289 spin_lock(&session->back_lock);
2290 task = (struct iscsi_task *)sc->SCp.ptr;
2291 if (!task || !task->sc) {
2292 /* task completed before time out */
2293 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2295 spin_unlock(&session->back_lock);
2298 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt);
2299 __iscsi_get_task(task);
2300 spin_unlock(&session->back_lock);
2302 if (task->state == ISCSI_TASK_PENDING) {
2303 fail_scsi_task(task, DID_ABORT);
2307 /* only have one tmf outstanding at a time */
2308 if (session->tmf_state != TMF_INITIAL)
2310 session->tmf_state = TMF_QUEUED;
2312 hdr = &session->tmhdr;
2313 iscsi_prep_abort_task_pdu(task, hdr);
2315 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2318 switch (session->tmf_state) {
2320 spin_unlock_bh(&session->frwd_lock);
2322 * stop tx side incase the target had sent a abort rsp but
2323 * the initiator was still writing out data.
2325 iscsi_suspend_tx(conn);
2327 * we do not stop the recv side because targets have been
2328 * good and have never sent us a successful tmf response
2329 * then sent more data for the cmd.
2331 spin_lock_bh(&session->frwd_lock);
2332 fail_scsi_task(task, DID_ABORT);
2333 session->tmf_state = TMF_INITIAL;
2334 memset(hdr, 0, sizeof(*hdr));
2335 spin_unlock_bh(&session->frwd_lock);
2336 iscsi_start_tx(conn);
2337 goto success_unlocked;
2339 session->running_aborted_task = task;
2340 spin_unlock_bh(&session->frwd_lock);
2341 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2342 goto failed_unlocked;
2344 if (iscsi_task_is_completed(task)) {
2345 session->tmf_state = TMF_INITIAL;
2346 memset(hdr, 0, sizeof(*hdr));
2347 /* task completed before tmf abort response */
2348 ISCSI_DBG_EH(session, "sc completed while abort in "
2354 session->tmf_state = TMF_INITIAL;
2359 spin_unlock_bh(&session->frwd_lock);
2361 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2363 iscsi_put_task(task);
2364 iscsi_put_conn(conn->cls_conn);
2365 mutex_unlock(&session->eh_mutex);
2369 spin_unlock_bh(&session->frwd_lock);
2371 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2372 task ? task->itt : 0);
2374 * The driver might be accessing the task so hold the ref. The conn
2375 * stop cleanup will drop the ref after ep_disconnect so we know the
2376 * driver's no longer touching the task.
2378 if (!session->running_aborted_task)
2379 iscsi_put_task(task);
2381 iscsi_put_conn(conn->cls_conn);
2382 mutex_unlock(&session->eh_mutex);
2385 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2387 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2389 memset(hdr, 0, sizeof(*hdr));
2390 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2391 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2392 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2393 int_to_scsilun(sc->device->lun, &hdr->lun);
2394 hdr->rtt = RESERVED_ITT;
2397 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2399 struct iscsi_cls_session *cls_session;
2400 struct iscsi_session *session;
2401 struct iscsi_conn *conn;
2402 struct iscsi_tm *hdr;
2405 cls_session = starget_to_session(scsi_target(sc->device));
2406 session = cls_session->dd_data;
2408 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2411 mutex_lock(&session->eh_mutex);
2412 spin_lock_bh(&session->frwd_lock);
2414 * Just check if we are not logged in. We cannot check for
2415 * the phase because the reset could come from a ioctl.
2417 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2419 conn = session->leadconn;
2421 /* only have one tmf outstanding at a time */
2422 if (session->tmf_state != TMF_INITIAL)
2424 session->tmf_state = TMF_QUEUED;
2426 hdr = &session->tmhdr;
2427 iscsi_prep_lun_reset_pdu(sc, hdr);
2429 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2430 session->lu_reset_timeout)) {
2435 switch (session->tmf_state) {
2439 spin_unlock_bh(&session->frwd_lock);
2440 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2443 session->tmf_state = TMF_INITIAL;
2448 spin_unlock_bh(&session->frwd_lock);
2450 iscsi_suspend_tx(conn);
2452 spin_lock_bh(&session->frwd_lock);
2453 memset(hdr, 0, sizeof(*hdr));
2454 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2455 session->tmf_state = TMF_INITIAL;
2456 spin_unlock_bh(&session->frwd_lock);
2458 iscsi_start_tx(conn);
2462 spin_unlock_bh(&session->frwd_lock);
2464 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2465 rc == SUCCESS ? "SUCCESS" : "FAILED");
2466 mutex_unlock(&session->eh_mutex);
2469 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2471 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2473 struct iscsi_session *session = cls_session->dd_data;
2475 spin_lock_bh(&session->frwd_lock);
2476 if (session->state != ISCSI_STATE_LOGGED_IN) {
2477 session->state = ISCSI_STATE_RECOVERY_FAILED;
2478 wake_up(&session->ehwait);
2480 spin_unlock_bh(&session->frwd_lock);
2482 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2485 * iscsi_eh_session_reset - drop session and attempt relogin
2488 * This function will wait for a relogin, session termination from
2489 * userspace, or a recovery/replacement timeout.
2491 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2493 struct iscsi_cls_session *cls_session;
2494 struct iscsi_session *session;
2495 struct iscsi_conn *conn;
2497 cls_session = starget_to_session(scsi_target(sc->device));
2498 session = cls_session->dd_data;
2500 mutex_lock(&session->eh_mutex);
2501 spin_lock_bh(&session->frwd_lock);
2502 if (session->state == ISCSI_STATE_TERMINATE) {
2504 ISCSI_DBG_EH(session,
2505 "failing session reset: Could not log back into "
2506 "%s [age %d]\n", session->targetname,
2508 spin_unlock_bh(&session->frwd_lock);
2509 mutex_unlock(&session->eh_mutex);
2513 conn = session->leadconn;
2514 iscsi_get_conn(conn->cls_conn);
2516 spin_unlock_bh(&session->frwd_lock);
2517 mutex_unlock(&session->eh_mutex);
2519 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2520 iscsi_put_conn(conn->cls_conn);
2522 ISCSI_DBG_EH(session, "wait for relogin\n");
2523 wait_event_interruptible(session->ehwait,
2524 session->state == ISCSI_STATE_TERMINATE ||
2525 session->state == ISCSI_STATE_LOGGED_IN ||
2526 session->state == ISCSI_STATE_RECOVERY_FAILED);
2527 if (signal_pending(current))
2528 flush_signals(current);
2530 mutex_lock(&session->eh_mutex);
2531 spin_lock_bh(&session->frwd_lock);
2532 if (session->state == ISCSI_STATE_LOGGED_IN) {
2533 ISCSI_DBG_EH(session,
2534 "session reset succeeded for %s,%s\n",
2535 session->targetname, conn->persistent_address);
2538 spin_unlock_bh(&session->frwd_lock);
2539 mutex_unlock(&session->eh_mutex);
2542 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2544 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2546 memset(hdr, 0, sizeof(*hdr));
2547 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2548 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2549 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2550 hdr->rtt = RESERVED_ITT;
2554 * iscsi_eh_target_reset - reset target
2557 * This will attempt to send a warm target reset.
2559 static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2561 struct iscsi_cls_session *cls_session;
2562 struct iscsi_session *session;
2563 struct iscsi_conn *conn;
2564 struct iscsi_tm *hdr;
2567 cls_session = starget_to_session(scsi_target(sc->device));
2568 session = cls_session->dd_data;
2570 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2571 session->targetname);
2573 mutex_lock(&session->eh_mutex);
2574 spin_lock_bh(&session->frwd_lock);
2576 * Just check if we are not logged in. We cannot check for
2577 * the phase because the reset could come from a ioctl.
2579 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2581 conn = session->leadconn;
2583 /* only have one tmf outstanding at a time */
2584 if (session->tmf_state != TMF_INITIAL)
2586 session->tmf_state = TMF_QUEUED;
2588 hdr = &session->tmhdr;
2589 iscsi_prep_tgt_reset_pdu(sc, hdr);
2591 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2592 session->tgt_reset_timeout)) {
2597 switch (session->tmf_state) {
2601 spin_unlock_bh(&session->frwd_lock);
2602 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2605 session->tmf_state = TMF_INITIAL;
2610 spin_unlock_bh(&session->frwd_lock);
2612 iscsi_suspend_tx(conn);
2614 spin_lock_bh(&session->frwd_lock);
2615 memset(hdr, 0, sizeof(*hdr));
2616 fail_scsi_tasks(conn, -1, DID_ERROR);
2617 session->tmf_state = TMF_INITIAL;
2618 spin_unlock_bh(&session->frwd_lock);
2620 iscsi_start_tx(conn);
2624 spin_unlock_bh(&session->frwd_lock);
2626 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2627 rc == SUCCESS ? "SUCCESS" : "FAILED");
2628 mutex_unlock(&session->eh_mutex);
2633 * iscsi_eh_recover_target - reset target and possibly the session
2636 * This will attempt to send a warm target reset. If that fails,
2637 * we will escalate to ERL0 session recovery.
2639 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2643 rc = iscsi_eh_target_reset(sc);
2645 rc = iscsi_eh_session_reset(sc);
2648 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2651 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2652 * should be accessed via kfifo_{get,put} on q->queue.
2653 * Optionally, the caller can obtain the array of object pointers
2654 * by passing in a non-NULL @items pointer
2657 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2659 int i, num_arrays = 1;
2661 memset(q, 0, sizeof(*q));
2665 /* If the user passed an items pointer, he wants a copy of
2669 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
2670 if (q->pool == NULL)
2673 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2675 for (i = 0; i < max; i++) {
2676 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2677 if (q->pool[i] == NULL) {
2681 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2685 *items = q->pool + max;
2686 memcpy(*items, q->pool, max * sizeof(void *));
2695 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2697 void iscsi_pool_free(struct iscsi_pool *q)
2701 for (i = 0; i < q->max; i++)
2705 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2707 int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost,
2708 uint16_t requested_cmds_max)
2710 int scsi_cmds, total_cmds = requested_cmds_max;
2714 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2716 * The iscsi layer needs some tasks for nop handling and tmfs,
2717 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2718 * + 1 command for scsi IO.
2720 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2721 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n",
2722 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2726 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2727 printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n",
2728 requested_cmds_max, ISCSI_TOTAL_CMDS_MAX,
2729 ISCSI_TOTAL_CMDS_MAX);
2730 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2733 if (!is_power_of_2(total_cmds)) {
2734 total_cmds = rounddown_pow_of_two(total_cmds);
2735 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2736 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n", requested_cmds_max, ISCSI_TOTAL_CMDS_MIN);
2740 printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n",
2741 requested_cmds_max, total_cmds);
2744 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2745 if (shost->can_queue && scsi_cmds > shost->can_queue) {
2746 total_cmds = shost->can_queue;
2748 printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n",
2749 requested_cmds_max, shost->can_queue);
2755 EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds);
2758 * iscsi_host_add - add host to system
2760 * @pdev: parent device
2762 * This should be called by partial offload and software iscsi drivers
2763 * to add a host to the system.
2765 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2767 if (!shost->can_queue)
2768 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2770 if (!shost->cmd_per_lun)
2771 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2773 return scsi_add_host(shost, pdev);
2775 EXPORT_SYMBOL_GPL(iscsi_host_add);
2778 * iscsi_host_alloc - allocate a host and driver data
2779 * @sht: scsi host template
2780 * @dd_data_size: driver host data size
2781 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2783 * This should be called by partial offload and software iscsi drivers.
2784 * To access the driver specific memory use the iscsi_host_priv() macro.
2786 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2787 int dd_data_size, bool xmit_can_sleep)
2789 struct Scsi_Host *shost;
2790 struct iscsi_host *ihost;
2792 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2795 ihost = shost_priv(shost);
2797 if (xmit_can_sleep) {
2798 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2799 "iscsi_q_%d", shost->host_no);
2800 ihost->workq = alloc_workqueue("%s",
2801 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
2802 1, ihost->workq_name);
2807 spin_lock_init(&ihost->lock);
2808 ihost->state = ISCSI_HOST_SETUP;
2809 ihost->num_sessions = 0;
2810 init_waitqueue_head(&ihost->session_removal_wq);
2814 scsi_host_put(shost);
2817 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2819 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2821 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2825 * iscsi_host_remove - remove host and sessions
2828 * If there are any sessions left, this will initiate the removal and wait
2829 * for the completion.
2831 void iscsi_host_remove(struct Scsi_Host *shost)
2833 struct iscsi_host *ihost = shost_priv(shost);
2834 unsigned long flags;
2836 spin_lock_irqsave(&ihost->lock, flags);
2837 ihost->state = ISCSI_HOST_REMOVED;
2838 spin_unlock_irqrestore(&ihost->lock, flags);
2840 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2841 wait_event_interruptible(ihost->session_removal_wq,
2842 ihost->num_sessions == 0);
2843 if (signal_pending(current))
2844 flush_signals(current);
2846 scsi_remove_host(shost);
2848 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2850 void iscsi_host_free(struct Scsi_Host *shost)
2852 struct iscsi_host *ihost = shost_priv(shost);
2855 destroy_workqueue(ihost->workq);
2857 kfree(ihost->netdev);
2858 kfree(ihost->hwaddress);
2859 kfree(ihost->initiatorname);
2860 scsi_host_put(shost);
2862 EXPORT_SYMBOL_GPL(iscsi_host_free);
2864 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2866 struct iscsi_host *ihost = shost_priv(shost);
2867 unsigned long flags;
2869 shost = scsi_host_get(shost);
2871 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2872 "of session teardown event because host already "
2877 spin_lock_irqsave(&ihost->lock, flags);
2878 ihost->num_sessions--;
2879 if (ihost->num_sessions == 0)
2880 wake_up(&ihost->session_removal_wq);
2881 spin_unlock_irqrestore(&ihost->lock, flags);
2882 scsi_host_put(shost);
2886 * iscsi_session_setup - create iscsi cls session and host and session
2887 * @iscsit: iscsi transport template
2889 * @cmds_max: session can queue
2890 * @dd_size: private driver data size, added to session allocation size
2891 * @cmd_task_size: LLD task private data size
2892 * @initial_cmdsn: initial CmdSN
2893 * @id: target ID to add to this session
2895 * This can be used by software iscsi_transports that allocate
2896 * a session per scsi host.
2898 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2899 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2900 * for nop handling and login/logout requests.
2902 struct iscsi_cls_session *
2903 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2904 uint16_t cmds_max, int dd_size, int cmd_task_size,
2905 uint32_t initial_cmdsn, unsigned int id)
2907 struct iscsi_host *ihost = shost_priv(shost);
2908 struct iscsi_session *session;
2909 struct iscsi_cls_session *cls_session;
2910 int cmd_i, scsi_cmds;
2911 unsigned long flags;
2913 spin_lock_irqsave(&ihost->lock, flags);
2914 if (ihost->state == ISCSI_HOST_REMOVED) {
2915 spin_unlock_irqrestore(&ihost->lock, flags);
2918 ihost->num_sessions++;
2919 spin_unlock_irqrestore(&ihost->lock, flags);
2921 scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
2923 goto dec_session_count;
2925 cls_session = iscsi_alloc_session(shost, iscsit,
2926 sizeof(struct iscsi_session) +
2929 goto dec_session_count;
2930 session = cls_session->dd_data;
2931 session->cls_session = cls_session;
2932 session->host = shost;
2933 session->state = ISCSI_STATE_FREE;
2934 session->fast_abort = 1;
2935 session->tgt_reset_timeout = 30;
2936 session->lu_reset_timeout = 15;
2937 session->abort_timeout = 10;
2938 session->scsi_cmds_max = scsi_cmds;
2939 session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX;
2940 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2941 session->exp_cmdsn = initial_cmdsn + 1;
2942 session->max_cmdsn = initial_cmdsn + 1;
2943 session->max_r2t = 1;
2944 session->tt = iscsit;
2945 session->dd_data = cls_session->dd_data + sizeof(*session);
2947 session->tmf_state = TMF_INITIAL;
2948 timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0);
2949 mutex_init(&session->eh_mutex);
2951 spin_lock_init(&session->frwd_lock);
2952 spin_lock_init(&session->back_lock);
2954 /* initialize SCSI PDU commands pool */
2955 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2956 (void***)&session->cmds,
2957 cmd_task_size + sizeof(struct iscsi_task)))
2958 goto cmdpool_alloc_fail;
2960 /* pre-format cmds pool with ITT */
2961 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2962 struct iscsi_task *task = session->cmds[cmd_i];
2965 task->dd_data = &task[1];
2967 task->state = ISCSI_TASK_FREE;
2968 INIT_LIST_HEAD(&task->running);
2971 if (!try_module_get(iscsit->owner))
2972 goto module_get_fail;
2974 if (iscsi_add_session(cls_session, id))
2975 goto cls_session_fail;
2980 module_put(iscsit->owner);
2982 iscsi_pool_free(&session->cmdpool);
2984 iscsi_free_session(cls_session);
2986 iscsi_host_dec_session_cnt(shost);
2989 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2992 * iscsi_session_teardown - destroy session, host, and cls_session
2993 * @cls_session: iscsi session
2995 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2997 struct iscsi_session *session = cls_session->dd_data;
2998 struct module *owner = cls_session->transport->owner;
2999 struct Scsi_Host *shost = session->host;
3001 iscsi_remove_session(cls_session);
3003 iscsi_pool_free(&session->cmdpool);
3004 kfree(session->password);
3005 kfree(session->password_in);
3006 kfree(session->username);
3007 kfree(session->username_in);
3008 kfree(session->targetname);
3009 kfree(session->targetalias);
3010 kfree(session->initiatorname);
3011 kfree(session->boot_root);
3012 kfree(session->boot_nic);
3013 kfree(session->boot_target);
3014 kfree(session->ifacename);
3015 kfree(session->portal_type);
3016 kfree(session->discovery_parent_type);
3018 iscsi_free_session(cls_session);
3020 iscsi_host_dec_session_cnt(shost);
3023 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
3026 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
3027 * @cls_session: iscsi_cls_session
3028 * @dd_size: private driver data size
3031 struct iscsi_cls_conn *
3032 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
3035 struct iscsi_session *session = cls_session->dd_data;
3036 struct iscsi_conn *conn;
3037 struct iscsi_cls_conn *cls_conn;
3040 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
3044 conn = cls_conn->dd_data;
3045 memset(conn, 0, sizeof(*conn) + dd_size);
3047 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
3048 conn->session = session;
3049 conn->cls_conn = cls_conn;
3050 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
3051 conn->id = conn_idx;
3052 conn->exp_statsn = 0;
3054 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
3056 INIT_LIST_HEAD(&conn->mgmtqueue);
3057 INIT_LIST_HEAD(&conn->cmdqueue);
3058 INIT_LIST_HEAD(&conn->requeue);
3059 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
3061 /* allocate login_task used for the login/text sequences */
3062 spin_lock_bh(&session->frwd_lock);
3063 if (!kfifo_out(&session->cmdpool.queue,
3064 (void*)&conn->login_task,
3066 spin_unlock_bh(&session->frwd_lock);
3067 goto login_task_alloc_fail;
3069 spin_unlock_bh(&session->frwd_lock);
3071 data = (char *) __get_free_pages(GFP_KERNEL,
3072 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3074 goto login_task_data_alloc_fail;
3075 conn->login_task->data = conn->data = data;
3077 init_waitqueue_head(&session->ehwait);
3081 login_task_data_alloc_fail:
3082 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3084 login_task_alloc_fail:
3085 iscsi_destroy_conn(cls_conn);
3088 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
3091 * iscsi_conn_teardown - teardown iscsi connection
3092 * @cls_conn: iscsi class connection
3094 * TODO: we may need to make this into a two step process
3095 * like scsi-mls remove + put host
3097 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
3099 struct iscsi_conn *conn = cls_conn->dd_data;
3100 struct iscsi_session *session = conn->session;
3102 del_timer_sync(&conn->transport_timer);
3104 mutex_lock(&session->eh_mutex);
3105 spin_lock_bh(&session->frwd_lock);
3106 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
3107 if (session->leadconn == conn) {
3109 * leading connection? then give up on recovery.
3111 session->state = ISCSI_STATE_TERMINATE;
3112 wake_up(&session->ehwait);
3114 spin_unlock_bh(&session->frwd_lock);
3116 /* flush queued up work because we free the connection below */
3117 iscsi_suspend_tx(conn);
3119 spin_lock_bh(&session->frwd_lock);
3120 free_pages((unsigned long) conn->data,
3121 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3122 kfree(conn->persistent_address);
3123 kfree(conn->local_ipaddr);
3124 /* regular RX path uses back_lock */
3125 spin_lock_bh(&session->back_lock);
3126 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3128 spin_unlock_bh(&session->back_lock);
3129 if (session->leadconn == conn)
3130 session->leadconn = NULL;
3131 spin_unlock_bh(&session->frwd_lock);
3132 mutex_unlock(&session->eh_mutex);
3134 iscsi_destroy_conn(cls_conn);
3136 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3138 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3140 struct iscsi_conn *conn = cls_conn->dd_data;
3141 struct iscsi_session *session = conn->session;
3144 iscsi_conn_printk(KERN_ERR, conn,
3145 "can't start unbound connection\n");
3149 if ((session->imm_data_en || !session->initial_r2t_en) &&
3150 session->first_burst > session->max_burst) {
3151 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3152 "first_burst %d max_burst %d\n",
3153 session->first_burst, session->max_burst);
3157 if (conn->ping_timeout && !conn->recv_timeout) {
3158 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3159 "zero. Using 5 seconds\n.");
3160 conn->recv_timeout = 5;
3163 if (conn->recv_timeout && !conn->ping_timeout) {
3164 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3165 "zero. Using 5 seconds.\n");
3166 conn->ping_timeout = 5;
3169 spin_lock_bh(&session->frwd_lock);
3170 conn->c_stage = ISCSI_CONN_STARTED;
3171 session->state = ISCSI_STATE_LOGGED_IN;
3172 session->queued_cmdsn = session->cmdsn;
3174 conn->last_recv = jiffies;
3175 conn->last_ping = jiffies;
3176 if (conn->recv_timeout && conn->ping_timeout)
3177 mod_timer(&conn->transport_timer,
3178 jiffies + (conn->recv_timeout * HZ));
3180 switch(conn->stop_stage) {
3181 case STOP_CONN_RECOVER:
3183 * unblock eh_abort() if it is blocked. re-try all
3184 * commands after successful recovery
3186 conn->stop_stage = 0;
3187 session->tmf_state = TMF_INITIAL;
3189 if (session->age == 16)
3192 case STOP_CONN_TERM:
3193 conn->stop_stage = 0;
3198 spin_unlock_bh(&session->frwd_lock);
3200 iscsi_unblock_session(session->cls_session);
3201 wake_up(&session->ehwait);
3204 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3207 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3209 struct iscsi_task *task;
3212 for (i = 0; i < conn->session->cmds_max; i++) {
3213 task = conn->session->cmds[i];
3217 if (task->state == ISCSI_TASK_FREE)
3220 ISCSI_DBG_SESSION(conn->session,
3221 "failing mgmt itt 0x%x state %d\n",
3222 task->itt, task->state);
3224 spin_lock_bh(&session->back_lock);
3225 if (cleanup_queued_task(task)) {
3226 spin_unlock_bh(&session->back_lock);
3230 state = ISCSI_TASK_ABRT_SESS_RECOV;
3231 if (task->state == ISCSI_TASK_PENDING)
3232 state = ISCSI_TASK_COMPLETED;
3233 iscsi_complete_task(task, state);
3234 spin_unlock_bh(&session->back_lock);
3238 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3240 struct iscsi_conn *conn = cls_conn->dd_data;
3241 struct iscsi_session *session = conn->session;
3244 mutex_lock(&session->eh_mutex);
3245 spin_lock_bh(&session->frwd_lock);
3246 if (conn->stop_stage == STOP_CONN_TERM) {
3247 spin_unlock_bh(&session->frwd_lock);
3248 mutex_unlock(&session->eh_mutex);
3253 * When this is called for the in_login state, we only want to clean
3254 * up the login task and connection. We do not need to block and set
3255 * the recovery state again
3257 if (flag == STOP_CONN_TERM)
3258 session->state = ISCSI_STATE_TERMINATE;
3259 else if (conn->stop_stage != STOP_CONN_RECOVER)
3260 session->state = ISCSI_STATE_IN_RECOVERY;
3262 old_stop_stage = conn->stop_stage;
3263 conn->stop_stage = flag;
3264 spin_unlock_bh(&session->frwd_lock);
3266 del_timer_sync(&conn->transport_timer);
3267 iscsi_suspend_tx(conn);
3269 spin_lock_bh(&session->frwd_lock);
3270 conn->c_stage = ISCSI_CONN_STOPPED;
3271 spin_unlock_bh(&session->frwd_lock);
3274 * for connection level recovery we should not calculate
3275 * header digest. conn->hdr_size used for optimization
3276 * in hdr_extract() and will be re-negotiated at
3279 if (flag == STOP_CONN_RECOVER) {
3280 conn->hdrdgst_en = 0;
3281 conn->datadgst_en = 0;
3282 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3283 old_stop_stage != STOP_CONN_RECOVER) {
3284 ISCSI_DBG_SESSION(session, "blocking session\n");
3285 iscsi_block_session(session->cls_session);
3292 spin_lock_bh(&session->frwd_lock);
3293 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3294 fail_mgmt_tasks(session, conn);
3295 memset(&session->tmhdr, 0, sizeof(session->tmhdr));
3296 spin_unlock_bh(&session->frwd_lock);
3297 mutex_unlock(&session->eh_mutex);
3299 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3301 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3302 struct iscsi_cls_conn *cls_conn, int is_leading)
3304 struct iscsi_session *session = cls_session->dd_data;
3305 struct iscsi_conn *conn = cls_conn->dd_data;
3307 spin_lock_bh(&session->frwd_lock);
3309 session->leadconn = conn;
3310 spin_unlock_bh(&session->frwd_lock);
3313 * The target could have reduced it's window size between logins, so
3314 * we have to reset max/exp cmdsn so we can see the new values.
3316 spin_lock_bh(&session->back_lock);
3317 session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1;
3318 spin_unlock_bh(&session->back_lock);
3320 * Unblock xmitworker(), Login Phase will pass through.
3322 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3323 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3326 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3328 int iscsi_switch_str_param(char **param, char *new_val_buf)
3333 if (!strcmp(*param, new_val_buf))
3337 new_val = kstrdup(new_val_buf, GFP_NOIO);
3345 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3347 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3348 enum iscsi_param param, char *buf, int buflen)
3350 struct iscsi_conn *conn = cls_conn->dd_data;
3351 struct iscsi_session *session = conn->session;
3355 case ISCSI_PARAM_FAST_ABORT:
3356 sscanf(buf, "%d", &session->fast_abort);
3358 case ISCSI_PARAM_ABORT_TMO:
3359 sscanf(buf, "%d", &session->abort_timeout);
3361 case ISCSI_PARAM_LU_RESET_TMO:
3362 sscanf(buf, "%d", &session->lu_reset_timeout);
3364 case ISCSI_PARAM_TGT_RESET_TMO:
3365 sscanf(buf, "%d", &session->tgt_reset_timeout);
3367 case ISCSI_PARAM_PING_TMO:
3368 sscanf(buf, "%d", &conn->ping_timeout);
3370 case ISCSI_PARAM_RECV_TMO:
3371 sscanf(buf, "%d", &conn->recv_timeout);
3373 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3374 sscanf(buf, "%d", &conn->max_recv_dlength);
3376 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3377 sscanf(buf, "%d", &conn->max_xmit_dlength);
3379 case ISCSI_PARAM_HDRDGST_EN:
3380 sscanf(buf, "%d", &conn->hdrdgst_en);
3382 case ISCSI_PARAM_DATADGST_EN:
3383 sscanf(buf, "%d", &conn->datadgst_en);
3385 case ISCSI_PARAM_INITIAL_R2T_EN:
3386 sscanf(buf, "%d", &session->initial_r2t_en);
3388 case ISCSI_PARAM_MAX_R2T:
3389 sscanf(buf, "%hu", &session->max_r2t);
3391 case ISCSI_PARAM_IMM_DATA_EN:
3392 sscanf(buf, "%d", &session->imm_data_en);
3394 case ISCSI_PARAM_FIRST_BURST:
3395 sscanf(buf, "%d", &session->first_burst);
3397 case ISCSI_PARAM_MAX_BURST:
3398 sscanf(buf, "%d", &session->max_burst);
3400 case ISCSI_PARAM_PDU_INORDER_EN:
3401 sscanf(buf, "%d", &session->pdu_inorder_en);
3403 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3404 sscanf(buf, "%d", &session->dataseq_inorder_en);
3406 case ISCSI_PARAM_ERL:
3407 sscanf(buf, "%d", &session->erl);
3409 case ISCSI_PARAM_EXP_STATSN:
3410 sscanf(buf, "%u", &conn->exp_statsn);
3412 case ISCSI_PARAM_USERNAME:
3413 return iscsi_switch_str_param(&session->username, buf);
3414 case ISCSI_PARAM_USERNAME_IN:
3415 return iscsi_switch_str_param(&session->username_in, buf);
3416 case ISCSI_PARAM_PASSWORD:
3417 return iscsi_switch_str_param(&session->password, buf);
3418 case ISCSI_PARAM_PASSWORD_IN:
3419 return iscsi_switch_str_param(&session->password_in, buf);
3420 case ISCSI_PARAM_TARGET_NAME:
3421 return iscsi_switch_str_param(&session->targetname, buf);
3422 case ISCSI_PARAM_TARGET_ALIAS:
3423 return iscsi_switch_str_param(&session->targetalias, buf);
3424 case ISCSI_PARAM_TPGT:
3425 sscanf(buf, "%d", &session->tpgt);
3427 case ISCSI_PARAM_PERSISTENT_PORT:
3428 sscanf(buf, "%d", &conn->persistent_port);
3430 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3431 return iscsi_switch_str_param(&conn->persistent_address, buf);
3432 case ISCSI_PARAM_IFACE_NAME:
3433 return iscsi_switch_str_param(&session->ifacename, buf);
3434 case ISCSI_PARAM_INITIATOR_NAME:
3435 return iscsi_switch_str_param(&session->initiatorname, buf);
3436 case ISCSI_PARAM_BOOT_ROOT:
3437 return iscsi_switch_str_param(&session->boot_root, buf);
3438 case ISCSI_PARAM_BOOT_NIC:
3439 return iscsi_switch_str_param(&session->boot_nic, buf);
3440 case ISCSI_PARAM_BOOT_TARGET:
3441 return iscsi_switch_str_param(&session->boot_target, buf);
3442 case ISCSI_PARAM_PORTAL_TYPE:
3443 return iscsi_switch_str_param(&session->portal_type, buf);
3444 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3445 return iscsi_switch_str_param(&session->discovery_parent_type,
3447 case ISCSI_PARAM_DISCOVERY_SESS:
3448 sscanf(buf, "%d", &val);
3449 session->discovery_sess = !!val;
3451 case ISCSI_PARAM_LOCAL_IPADDR:
3452 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3459 EXPORT_SYMBOL_GPL(iscsi_set_param);
3461 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3462 enum iscsi_param param, char *buf)
3464 struct iscsi_session *session = cls_session->dd_data;
3468 case ISCSI_PARAM_FAST_ABORT:
3469 len = sysfs_emit(buf, "%d\n", session->fast_abort);
3471 case ISCSI_PARAM_ABORT_TMO:
3472 len = sysfs_emit(buf, "%d\n", session->abort_timeout);
3474 case ISCSI_PARAM_LU_RESET_TMO:
3475 len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout);
3477 case ISCSI_PARAM_TGT_RESET_TMO:
3478 len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout);
3480 case ISCSI_PARAM_INITIAL_R2T_EN:
3481 len = sysfs_emit(buf, "%d\n", session->initial_r2t_en);
3483 case ISCSI_PARAM_MAX_R2T:
3484 len = sysfs_emit(buf, "%hu\n", session->max_r2t);
3486 case ISCSI_PARAM_IMM_DATA_EN:
3487 len = sysfs_emit(buf, "%d\n", session->imm_data_en);
3489 case ISCSI_PARAM_FIRST_BURST:
3490 len = sysfs_emit(buf, "%u\n", session->first_burst);
3492 case ISCSI_PARAM_MAX_BURST:
3493 len = sysfs_emit(buf, "%u\n", session->max_burst);
3495 case ISCSI_PARAM_PDU_INORDER_EN:
3496 len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en);
3498 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3499 len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en);
3501 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3502 len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo);
3504 case ISCSI_PARAM_ERL:
3505 len = sysfs_emit(buf, "%d\n", session->erl);
3507 case ISCSI_PARAM_TARGET_NAME:
3508 len = sysfs_emit(buf, "%s\n", session->targetname);
3510 case ISCSI_PARAM_TARGET_ALIAS:
3511 len = sysfs_emit(buf, "%s\n", session->targetalias);
3513 case ISCSI_PARAM_TPGT:
3514 len = sysfs_emit(buf, "%d\n", session->tpgt);
3516 case ISCSI_PARAM_USERNAME:
3517 len = sysfs_emit(buf, "%s\n", session->username);
3519 case ISCSI_PARAM_USERNAME_IN:
3520 len = sysfs_emit(buf, "%s\n", session->username_in);
3522 case ISCSI_PARAM_PASSWORD:
3523 len = sysfs_emit(buf, "%s\n", session->password);
3525 case ISCSI_PARAM_PASSWORD_IN:
3526 len = sysfs_emit(buf, "%s\n", session->password_in);
3528 case ISCSI_PARAM_IFACE_NAME:
3529 len = sysfs_emit(buf, "%s\n", session->ifacename);
3531 case ISCSI_PARAM_INITIATOR_NAME:
3532 len = sysfs_emit(buf, "%s\n", session->initiatorname);
3534 case ISCSI_PARAM_BOOT_ROOT:
3535 len = sysfs_emit(buf, "%s\n", session->boot_root);
3537 case ISCSI_PARAM_BOOT_NIC:
3538 len = sysfs_emit(buf, "%s\n", session->boot_nic);
3540 case ISCSI_PARAM_BOOT_TARGET:
3541 len = sysfs_emit(buf, "%s\n", session->boot_target);
3543 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3544 len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable);
3546 case ISCSI_PARAM_DISCOVERY_SESS:
3547 len = sysfs_emit(buf, "%u\n", session->discovery_sess);
3549 case ISCSI_PARAM_PORTAL_TYPE:
3550 len = sysfs_emit(buf, "%s\n", session->portal_type);
3552 case ISCSI_PARAM_CHAP_AUTH_EN:
3553 len = sysfs_emit(buf, "%u\n", session->chap_auth_en);
3555 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3556 len = sysfs_emit(buf, "%u\n", session->discovery_logout_en);
3558 case ISCSI_PARAM_BIDI_CHAP_EN:
3559 len = sysfs_emit(buf, "%u\n", session->bidi_chap_en);
3561 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3562 len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional);
3564 case ISCSI_PARAM_DEF_TIME2WAIT:
3565 len = sysfs_emit(buf, "%d\n", session->time2wait);
3567 case ISCSI_PARAM_DEF_TIME2RETAIN:
3568 len = sysfs_emit(buf, "%d\n", session->time2retain);
3570 case ISCSI_PARAM_TSID:
3571 len = sysfs_emit(buf, "%u\n", session->tsid);
3573 case ISCSI_PARAM_ISID:
3574 len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n",
3575 session->isid[0], session->isid[1],
3576 session->isid[2], session->isid[3],
3577 session->isid[4], session->isid[5]);
3579 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3580 len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx);
3582 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3583 if (session->discovery_parent_type)
3584 len = sysfs_emit(buf, "%s\n",
3585 session->discovery_parent_type);
3587 len = sysfs_emit(buf, "\n");
3595 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3597 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3598 enum iscsi_param param, char *buf)
3600 struct sockaddr_in6 *sin6 = NULL;
3601 struct sockaddr_in *sin = NULL;
3604 switch (addr->ss_family) {
3606 sin = (struct sockaddr_in *)addr;
3609 sin6 = (struct sockaddr_in6 *)addr;
3616 case ISCSI_PARAM_CONN_ADDRESS:
3617 case ISCSI_HOST_PARAM_IPADDRESS:
3619 len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr);
3621 len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr);
3623 case ISCSI_PARAM_CONN_PORT:
3624 case ISCSI_PARAM_LOCAL_PORT:
3626 len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3628 len = sysfs_emit(buf, "%hu\n",
3629 be16_to_cpu(sin6->sin6_port));
3637 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3639 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3640 enum iscsi_param param, char *buf)
3642 struct iscsi_conn *conn = cls_conn->dd_data;
3646 case ISCSI_PARAM_PING_TMO:
3647 len = sysfs_emit(buf, "%u\n", conn->ping_timeout);
3649 case ISCSI_PARAM_RECV_TMO:
3650 len = sysfs_emit(buf, "%u\n", conn->recv_timeout);
3652 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3653 len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength);
3655 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3656 len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength);
3658 case ISCSI_PARAM_HDRDGST_EN:
3659 len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en);
3661 case ISCSI_PARAM_DATADGST_EN:
3662 len = sysfs_emit(buf, "%d\n", conn->datadgst_en);
3664 case ISCSI_PARAM_IFMARKER_EN:
3665 len = sysfs_emit(buf, "%d\n", conn->ifmarker_en);
3667 case ISCSI_PARAM_OFMARKER_EN:
3668 len = sysfs_emit(buf, "%d\n", conn->ofmarker_en);
3670 case ISCSI_PARAM_EXP_STATSN:
3671 len = sysfs_emit(buf, "%u\n", conn->exp_statsn);
3673 case ISCSI_PARAM_PERSISTENT_PORT:
3674 len = sysfs_emit(buf, "%d\n", conn->persistent_port);
3676 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3677 len = sysfs_emit(buf, "%s\n", conn->persistent_address);
3679 case ISCSI_PARAM_STATSN:
3680 len = sysfs_emit(buf, "%u\n", conn->statsn);
3682 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3683 len = sysfs_emit(buf, "%u\n", conn->max_segment_size);
3685 case ISCSI_PARAM_KEEPALIVE_TMO:
3686 len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo);
3688 case ISCSI_PARAM_LOCAL_PORT:
3689 len = sysfs_emit(buf, "%u\n", conn->local_port);
3691 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3692 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat);
3694 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3695 len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable);
3697 case ISCSI_PARAM_TCP_WSF_DISABLE:
3698 len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable);
3700 case ISCSI_PARAM_TCP_TIMER_SCALE:
3701 len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale);
3703 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3704 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en);
3706 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3707 len = sysfs_emit(buf, "%u\n", conn->fragment_disable);
3709 case ISCSI_PARAM_IPV4_TOS:
3710 len = sysfs_emit(buf, "%u\n", conn->ipv4_tos);
3712 case ISCSI_PARAM_IPV6_TC:
3713 len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class);
3715 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3716 len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label);
3718 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3719 len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6);
3721 case ISCSI_PARAM_TCP_XMIT_WSF:
3722 len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf);
3724 case ISCSI_PARAM_TCP_RECV_WSF:
3725 len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf);
3727 case ISCSI_PARAM_LOCAL_IPADDR:
3728 len = sysfs_emit(buf, "%s\n", conn->local_ipaddr);
3736 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3738 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3741 struct iscsi_host *ihost = shost_priv(shost);
3745 case ISCSI_HOST_PARAM_NETDEV_NAME:
3746 len = sysfs_emit(buf, "%s\n", ihost->netdev);
3748 case ISCSI_HOST_PARAM_HWADDRESS:
3749 len = sysfs_emit(buf, "%s\n", ihost->hwaddress);
3751 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3752 len = sysfs_emit(buf, "%s\n", ihost->initiatorname);
3760 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3762 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3763 char *buf, int buflen)
3765 struct iscsi_host *ihost = shost_priv(shost);
3768 case ISCSI_HOST_PARAM_NETDEV_NAME:
3769 return iscsi_switch_str_param(&ihost->netdev, buf);
3770 case ISCSI_HOST_PARAM_HWADDRESS:
3771 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3772 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3773 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3780 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3782 MODULE_AUTHOR("Mike Christie");
3783 MODULE_DESCRIPTION("iSCSI library functions");
3784 MODULE_LICENSE("GPL");