Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / scsi / libiscsi.c
blob4e668aafbcca0bd13d93a1b44237cfd23bc871e7
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * iSCSI lib functions
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>
19 #include <net/tcp.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,
34 S_IRUGO | S_IWUSR);
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,
41 S_IRUGO | S_IWUSR);
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,
48 S_IRUGO | S_IWUSR);
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...) \
54 do { \
55 if (iscsi_dbg_lib_conn) \
56 iscsi_conn_printk(KERN_INFO, _conn, \
57 "%s " dbg_fmt, \
58 __func__, ##arg); \
59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
60 &(_conn)->cls_conn->dev, \
61 "%s " dbg_fmt, __func__, ##arg);\
62 } while (0);
64 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
65 do { \
66 if (iscsi_dbg_lib_session) \
67 iscsi_session_printk(KERN_INFO, _session, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 iscsi_dbg_trace(trace_iscsi_dbg_session, \
71 &(_session)->cls_session->dev, \
72 "%s " dbg_fmt, __func__, ##arg); \
73 } while (0);
75 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
76 do { \
77 if (iscsi_dbg_lib_eh) \
78 iscsi_session_printk(KERN_INFO, _session, \
79 "%s " dbg_fmt, \
80 __func__, ##arg); \
81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
82 &(_session)->cls_session->dev, \
83 "%s " dbg_fmt, __func__, ##arg); \
84 } while (0);
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);
91 if (ihost->workq)
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))
104 return;
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
125 * @r2t: R2T info
126 * @hdr: iscsi data in pdu
128 * Notes:
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));
143 hdr->ttt = r2t->ttt;
144 hdr->datasn = cpu_to_be32(r2t->datasn);
145 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;
154 hdr->flags = 0;
155 } else {
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) {
169 WARN_ON(1);
170 return -EINVAL;
173 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
174 task->hdr_len = exp_len;
175 return 0;
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;
187 int rc;
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);
199 if (rc)
200 return rc;
202 if (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,
214 task->hdr_len);
215 return 0;
219 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
220 * @task: iscsi task
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
227 * affected LUN.
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_conn *conn = task->conn;
234 struct iscsi_tm *tmf = &conn->tmhdr;
235 u64 hdr_lun;
237 if (conn->tmf_state == TMF_INITIAL)
238 return 0;
240 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
241 return 0;
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)
250 return 0;
251 fallthrough;
252 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
254 * Fail all SCSI cmd PDUs
256 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
257 iscsi_conn_printk(KERN_INFO, conn,
258 "task [op %x itt "
259 "0x%x/0x%x] "
260 "rejected.\n",
261 opcode, task->itt,
262 task->hdr_itt);
263 return -EACCES;
266 * And also all data-out PDUs in response to R2T
267 * if fast_abort is set.
269 if (conn->session->fast_abort) {
270 iscsi_conn_printk(KERN_INFO, conn,
271 "task [op %x itt "
272 "0x%x/0x%x] fast abort.\n",
273 opcode, task->itt,
274 task->hdr_itt);
275 return -EACCES;
277 break;
278 case ISCSI_TM_FUNC_ABORT_TASK:
280 * the caller has already checked if the task
281 * they want to abort was in the pending queue so if
282 * we are here the cmd pdu has gone out already, and
283 * we will only hit this for data-outs
285 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
286 task->hdr_itt == tmf->rtt) {
287 ISCSI_DBG_SESSION(conn->session,
288 "Preventing task %x/%x from sending "
289 "data-out due to abort task in "
290 "progress\n", task->itt,
291 task->hdr_itt);
292 return -EACCES;
294 break;
297 return 0;
301 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
302 * @task: iscsi task
304 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
305 * fields like dlength or final based on how much data it sends
307 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
309 struct iscsi_conn *conn = task->conn;
310 struct iscsi_session *session = conn->session;
311 struct scsi_cmnd *sc = task->sc;
312 struct iscsi_scsi_req *hdr;
313 unsigned hdrlength, cmd_len, transfer_length;
314 itt_t itt;
315 int rc;
317 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
318 if (rc)
319 return rc;
321 if (conn->session->tt->alloc_pdu) {
322 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
323 if (rc)
324 return rc;
326 hdr = (struct iscsi_scsi_req *)task->hdr;
327 itt = hdr->itt;
328 memset(hdr, 0, sizeof(*hdr));
330 if (session->tt->parse_pdu_itt)
331 hdr->itt = task->hdr_itt = itt;
332 else
333 hdr->itt = task->hdr_itt = build_itt(task->itt,
334 task->conn->session->age);
335 task->hdr_len = 0;
336 rc = iscsi_add_hdr(task, sizeof(*hdr));
337 if (rc)
338 return rc;
339 hdr->opcode = ISCSI_OP_SCSI_CMD;
340 hdr->flags = ISCSI_ATTR_SIMPLE;
341 int_to_scsilun(sc->device->lun, &hdr->lun);
342 task->lun = hdr->lun;
343 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
344 cmd_len = sc->cmd_len;
345 if (cmd_len < ISCSI_CDB_SIZE)
346 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
347 else if (cmd_len > ISCSI_CDB_SIZE) {
348 rc = iscsi_prep_ecdb_ahs(task);
349 if (rc)
350 return rc;
351 cmd_len = ISCSI_CDB_SIZE;
353 memcpy(hdr->cdb, sc->cmnd, cmd_len);
355 task->imm_count = 0;
356 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
357 task->protected = true;
359 transfer_length = scsi_transfer_length(sc);
360 hdr->data_length = cpu_to_be32(transfer_length);
361 if (sc->sc_data_direction == DMA_TO_DEVICE) {
362 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
364 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
366 * Write counters:
368 * imm_count bytes to be sent right after
369 * SCSI PDU Header
371 * unsol_count bytes(as Data-Out) to be sent
372 * without R2T ack right after
373 * immediate data
375 * r2t data_length bytes to be sent via R2T ack's
377 * pad_count bytes to be sent as zero-padding
379 memset(r2t, 0, sizeof(*r2t));
381 if (session->imm_data_en) {
382 if (transfer_length >= session->first_burst)
383 task->imm_count = min(session->first_burst,
384 conn->max_xmit_dlength);
385 else
386 task->imm_count = min(transfer_length,
387 conn->max_xmit_dlength);
388 hton24(hdr->dlength, task->imm_count);
389 } else
390 zero_data(hdr->dlength);
392 if (!session->initial_r2t_en) {
393 r2t->data_length = min(session->first_burst,
394 transfer_length) -
395 task->imm_count;
396 r2t->data_offset = task->imm_count;
397 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
398 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
401 if (!task->unsol_r2t.data_length)
402 /* No unsolicit Data-Out's */
403 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
404 } else {
405 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
406 zero_data(hdr->dlength);
408 if (sc->sc_data_direction == DMA_FROM_DEVICE)
409 hdr->flags |= ISCSI_FLAG_CMD_READ;
412 /* calculate size of additional header segments (AHSs) */
413 hdrlength = task->hdr_len - sizeof(*hdr);
415 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
416 hdrlength /= ISCSI_PAD_LEN;
418 WARN_ON(hdrlength >= 256);
419 hdr->hlength = hdrlength & 0xFF;
420 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
422 if (session->tt->init_task && session->tt->init_task(task))
423 return -EIO;
425 task->state = ISCSI_TASK_RUNNING;
426 session->cmdsn++;
428 conn->scsicmd_pdus_cnt++;
429 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
430 "itt 0x%x len %d cmdsn %d win %d]\n",
431 sc->sc_data_direction == DMA_TO_DEVICE ?
432 "write" : "read", conn->id, sc, sc->cmnd[0],
433 task->itt, transfer_length,
434 session->cmdsn,
435 session->max_cmdsn - session->exp_cmdsn + 1);
436 return 0;
440 * iscsi_free_task - free a task
441 * @task: iscsi cmd task
443 * Must be called with session back_lock.
444 * This function returns the scsi command to scsi-ml or cleans
445 * up mgmt tasks then returns the task to the pool.
447 static void iscsi_free_task(struct iscsi_task *task)
449 struct iscsi_conn *conn = task->conn;
450 struct iscsi_session *session = conn->session;
451 struct scsi_cmnd *sc = task->sc;
452 int oldstate = task->state;
454 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
455 task->itt, task->state, task->sc);
457 session->tt->cleanup_task(task);
458 task->state = ISCSI_TASK_FREE;
459 task->sc = NULL;
461 * login task is preallocated so do not free
463 if (conn->login_task == task)
464 return;
466 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
468 if (sc) {
469 /* SCSI eh reuses commands to verify us */
470 sc->SCp.ptr = NULL;
472 * queue command may call this to free the task, so
473 * it will decide how to return sc to scsi-ml.
475 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
476 sc->scsi_done(sc);
480 void __iscsi_get_task(struct iscsi_task *task)
482 refcount_inc(&task->refcount);
484 EXPORT_SYMBOL_GPL(__iscsi_get_task);
486 void __iscsi_put_task(struct iscsi_task *task)
488 if (refcount_dec_and_test(&task->refcount))
489 iscsi_free_task(task);
491 EXPORT_SYMBOL_GPL(__iscsi_put_task);
493 void iscsi_put_task(struct iscsi_task *task)
495 struct iscsi_session *session = task->conn->session;
497 /* regular RX path uses back_lock */
498 spin_lock_bh(&session->back_lock);
499 __iscsi_put_task(task);
500 spin_unlock_bh(&session->back_lock);
502 EXPORT_SYMBOL_GPL(iscsi_put_task);
505 * iscsi_complete_task - finish a task
506 * @task: iscsi cmd task
507 * @state: state to complete task with
509 * Must be called with session back_lock.
511 static void iscsi_complete_task(struct iscsi_task *task, int state)
513 struct iscsi_conn *conn = task->conn;
515 ISCSI_DBG_SESSION(conn->session,
516 "complete task itt 0x%x state %d sc %p\n",
517 task->itt, task->state, task->sc);
518 if (task->state == ISCSI_TASK_COMPLETED ||
519 task->state == ISCSI_TASK_ABRT_TMF ||
520 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
521 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
522 return;
523 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
524 task->state = state;
526 spin_lock_bh(&conn->taskqueuelock);
527 if (!list_empty(&task->running)) {
528 pr_debug_once("%s while task on list", __func__);
529 list_del_init(&task->running);
531 spin_unlock_bh(&conn->taskqueuelock);
533 if (conn->task == task)
534 conn->task = NULL;
536 if (READ_ONCE(conn->ping_task) == task)
537 WRITE_ONCE(conn->ping_task, NULL);
539 /* release get from queueing */
540 __iscsi_put_task(task);
544 * iscsi_complete_scsi_task - finish scsi task normally
545 * @task: iscsi task for scsi cmd
546 * @exp_cmdsn: expected cmd sn in cpu format
547 * @max_cmdsn: max cmd sn in cpu format
549 * This is used when drivers do not need or cannot perform
550 * lower level pdu processing.
552 * Called with session back_lock
554 void iscsi_complete_scsi_task(struct iscsi_task *task,
555 uint32_t exp_cmdsn, uint32_t max_cmdsn)
557 struct iscsi_conn *conn = task->conn;
559 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
561 conn->last_recv = jiffies;
562 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
563 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
565 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
569 * session back_lock must be held and if not called for a task that is
570 * still pending or from the xmit thread, then xmit thread must
571 * be suspended.
573 static void fail_scsi_task(struct iscsi_task *task, int err)
575 struct iscsi_conn *conn = task->conn;
576 struct scsi_cmnd *sc;
577 int state;
580 * if a command completes and we get a successful tmf response
581 * we will hit this because the scsi eh abort code does not take
582 * a ref to the task.
584 sc = task->sc;
585 if (!sc)
586 return;
588 if (task->state == ISCSI_TASK_PENDING) {
590 * cmd never made it to the xmit thread, so we should not count
591 * the cmd in the sequencing
593 conn->session->queued_cmdsn--;
594 /* it was never sent so just complete like normal */
595 state = ISCSI_TASK_COMPLETED;
596 } else if (err == DID_TRANSPORT_DISRUPTED)
597 state = ISCSI_TASK_ABRT_SESS_RECOV;
598 else
599 state = ISCSI_TASK_ABRT_TMF;
601 sc->result = err << 16;
602 scsi_set_resid(sc, scsi_bufflen(sc));
604 /* regular RX path uses back_lock */
605 spin_lock_bh(&conn->session->back_lock);
606 iscsi_complete_task(task, state);
607 spin_unlock_bh(&conn->session->back_lock);
610 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
611 struct iscsi_task *task)
613 struct iscsi_session *session = conn->session;
614 struct iscsi_hdr *hdr = task->hdr;
615 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
616 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
618 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
619 return -ENOTCONN;
621 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
622 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
624 * pre-format CmdSN for outgoing PDU.
626 nop->cmdsn = cpu_to_be32(session->cmdsn);
627 if (hdr->itt != RESERVED_ITT) {
629 * TODO: We always use immediate for normal session pdus.
630 * If we start to send tmfs or nops as non-immediate then
631 * we should start checking the cmdsn numbers for mgmt tasks.
633 * During discovery sessions iscsid sends TEXT as non immediate,
634 * but we always only send one PDU at a time.
636 if (conn->c_stage == ISCSI_CONN_STARTED &&
637 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
638 session->queued_cmdsn++;
639 session->cmdsn++;
643 if (session->tt->init_task && session->tt->init_task(task))
644 return -EIO;
646 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
647 session->state = ISCSI_STATE_LOGGING_OUT;
649 task->state = ISCSI_TASK_RUNNING;
650 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
651 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
652 hdr->itt, task->data_count);
653 return 0;
656 static struct iscsi_task *
657 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
658 char *data, uint32_t data_size)
660 struct iscsi_session *session = conn->session;
661 struct iscsi_host *ihost = shost_priv(session->host);
662 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
663 struct iscsi_task *task;
664 itt_t itt;
666 if (session->state == ISCSI_STATE_TERMINATE)
667 return NULL;
669 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
671 * Login and Text are sent serially, in
672 * request-followed-by-response sequence.
673 * Same task can be used. Same ITT must be used.
674 * Note that login_task is preallocated at conn_create().
676 if (conn->login_task->state != ISCSI_TASK_FREE) {
677 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
678 "progress. Cannot start new task.\n");
679 return NULL;
682 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
683 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);
684 return NULL;
687 task = conn->login_task;
688 } else {
689 if (session->state != ISCSI_STATE_LOGGED_IN)
690 return NULL;
692 if (data_size != 0) {
693 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
694 return NULL;
697 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
698 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
700 if (!kfifo_out(&session->cmdpool.queue,
701 (void*)&task, sizeof(void*)))
702 return NULL;
705 * released in complete pdu for task we expect a response for, and
706 * released by the lld when it has transmitted the task for
707 * pdus we do not expect a response for.
709 refcount_set(&task->refcount, 1);
710 task->conn = conn;
711 task->sc = NULL;
712 INIT_LIST_HEAD(&task->running);
713 task->state = ISCSI_TASK_PENDING;
715 if (data_size) {
716 memcpy(task->data, data, data_size);
717 task->data_count = data_size;
718 } else
719 task->data_count = 0;
721 if (conn->session->tt->alloc_pdu) {
722 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
723 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
724 "pdu for mgmt task.\n");
725 goto free_task;
729 itt = task->hdr->itt;
730 task->hdr_len = sizeof(struct iscsi_hdr);
731 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
733 if (hdr->itt != RESERVED_ITT) {
734 if (session->tt->parse_pdu_itt)
735 task->hdr->itt = itt;
736 else
737 task->hdr->itt = build_itt(task->itt,
738 task->conn->session->age);
741 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK))
742 WRITE_ONCE(conn->ping_task, task);
744 if (!ihost->workq) {
745 if (iscsi_prep_mgmt_task(conn, task))
746 goto free_task;
748 if (session->tt->xmit_task(task))
749 goto free_task;
750 } else {
751 spin_lock_bh(&conn->taskqueuelock);
752 list_add_tail(&task->running, &conn->mgmtqueue);
753 spin_unlock_bh(&conn->taskqueuelock);
754 iscsi_conn_queue_work(conn);
757 return task;
759 free_task:
760 /* regular RX path uses back_lock */
761 spin_lock(&session->back_lock);
762 __iscsi_put_task(task);
763 spin_unlock(&session->back_lock);
764 return NULL;
767 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
768 char *data, uint32_t data_size)
770 struct iscsi_conn *conn = cls_conn->dd_data;
771 struct iscsi_session *session = conn->session;
772 int err = 0;
774 spin_lock_bh(&session->frwd_lock);
775 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
776 err = -EPERM;
777 spin_unlock_bh(&session->frwd_lock);
778 return err;
780 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
783 * iscsi_scsi_cmd_rsp - SCSI Command Response processing
784 * @conn: iscsi connection
785 * @hdr: iscsi header
786 * @task: scsi command task
787 * @data: cmd data buffer
788 * @datalen: len of buffer
790 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
791 * then completes the command and task. called under back_lock
793 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
794 struct iscsi_task *task, char *data,
795 int datalen)
797 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
798 struct iscsi_session *session = conn->session;
799 struct scsi_cmnd *sc = task->sc;
801 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
802 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
804 sc->result = (DID_OK << 16) | rhdr->cmd_status;
806 if (task->protected) {
807 sector_t sector;
808 u8 ascq;
811 * Transports that didn't implement check_protection
812 * callback but still published T10-PI support to scsi-mid
813 * deserve this BUG_ON.
815 BUG_ON(!session->tt->check_protection);
817 ascq = session->tt->check_protection(task, &sector);
818 if (ascq) {
819 sc->result = DRIVER_SENSE << 24 |
820 SAM_STAT_CHECK_CONDITION;
821 scsi_build_sense_buffer(1, sc->sense_buffer,
822 ILLEGAL_REQUEST, 0x10, ascq);
823 scsi_set_sense_information(sc->sense_buffer,
824 SCSI_SENSE_BUFFERSIZE,
825 sector);
826 goto out;
830 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
831 sc->result = DID_ERROR << 16;
832 goto out;
835 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
836 uint16_t senselen;
838 if (datalen < 2) {
839 invalid_datalen:
840 iscsi_conn_printk(KERN_ERR, conn,
841 "Got CHECK_CONDITION but invalid data "
842 "buffer size of %d\n", datalen);
843 sc->result = DID_BAD_TARGET << 16;
844 goto out;
847 senselen = get_unaligned_be16(data);
848 if (datalen < senselen)
849 goto invalid_datalen;
851 memcpy(sc->sense_buffer, data + 2,
852 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
853 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
854 min_t(uint16_t, senselen,
855 SCSI_SENSE_BUFFERSIZE));
858 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
859 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
860 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
863 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
864 ISCSI_FLAG_CMD_OVERFLOW)) {
865 int res_count = be32_to_cpu(rhdr->residual_count);
867 if (res_count > 0 &&
868 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
869 res_count <= scsi_bufflen(sc)))
870 /* write side for bidi or uni-io set_resid */
871 scsi_set_resid(sc, res_count);
872 else
873 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
875 out:
876 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
877 sc, sc->result, task->itt);
878 conn->scsirsp_pdus_cnt++;
879 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
883 * iscsi_data_in_rsp - SCSI Data-In Response processing
884 * @conn: iscsi connection
885 * @hdr: iscsi pdu
886 * @task: scsi command task
888 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received
889 * then completes the command and task. called under back_lock
891 static void
892 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
893 struct iscsi_task *task)
895 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
896 struct scsi_cmnd *sc = task->sc;
898 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
899 return;
901 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
902 sc->result = (DID_OK << 16) | rhdr->cmd_status;
903 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
904 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
905 ISCSI_FLAG_DATA_OVERFLOW)) {
906 int res_count = be32_to_cpu(rhdr->residual_count);
908 if (res_count > 0 &&
909 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
910 res_count <= sc->sdb.length))
911 scsi_set_resid(sc, res_count);
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
916 ISCSI_DBG_SESSION(conn->session, "data in with status done "
917 "[sc %p res %d itt 0x%x]\n",
918 sc, sc->result, task->itt);
919 conn->scsirsp_pdus_cnt++;
920 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
923 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
925 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
927 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
928 conn->tmfrsp_pdus_cnt++;
930 if (conn->tmf_state != TMF_QUEUED)
931 return;
933 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
934 conn->tmf_state = TMF_SUCCESS;
935 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
936 conn->tmf_state = TMF_NOT_FOUND;
937 else
938 conn->tmf_state = TMF_FAILED;
939 wake_up(&conn->ehwait);
942 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
944 struct iscsi_nopout hdr;
945 struct iscsi_task *task;
947 if (!rhdr) {
948 if (READ_ONCE(conn->ping_task))
949 return -EINVAL;
950 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK);
953 memset(&hdr, 0, sizeof(struct iscsi_nopout));
954 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
955 hdr.flags = ISCSI_FLAG_CMD_FINAL;
957 if (rhdr) {
958 hdr.lun = rhdr->lun;
959 hdr.ttt = rhdr->ttt;
960 hdr.itt = RESERVED_ITT;
961 } else
962 hdr.ttt = RESERVED_ITT;
964 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
965 if (!task) {
966 if (!rhdr)
967 WRITE_ONCE(conn->ping_task, NULL);
968 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
969 return -EIO;
970 } else if (!rhdr) {
971 /* only track our nops */
972 conn->last_ping = jiffies;
975 return 0;
979 * iscsi_nop_out_rsp - SCSI NOP Response processing
980 * @task: scsi command task
981 * @nop: the nop structure
982 * @data: where to put the data
983 * @datalen: length of data
985 * iscsi_nop_out_rsp handles nop response from use or
986 * from user space. called under back_lock
988 static int iscsi_nop_out_rsp(struct iscsi_task *task,
989 struct iscsi_nopin *nop, char *data, int datalen)
991 struct iscsi_conn *conn = task->conn;
992 int rc = 0;
994 if (READ_ONCE(conn->ping_task) != task) {
996 * If this is not in response to one of our
997 * nops then it must be from userspace.
999 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1000 data, datalen))
1001 rc = ISCSI_ERR_CONN_FAILED;
1002 } else
1003 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1004 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1005 return rc;
1008 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1009 char *data, int datalen)
1011 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1012 struct iscsi_hdr rejected_pdu;
1013 int opcode, rc = 0;
1015 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1017 if (ntoh24(reject->dlength) > datalen ||
1018 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1019 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1020 "pdu. Invalid data length (pdu dlength "
1021 "%u, datalen %d\n", ntoh24(reject->dlength),
1022 datalen);
1023 return ISCSI_ERR_PROTO;
1025 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1026 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1028 switch (reject->reason) {
1029 case ISCSI_REASON_DATA_DIGEST_ERROR:
1030 iscsi_conn_printk(KERN_ERR, conn,
1031 "pdu (op 0x%x itt 0x%x) rejected "
1032 "due to DataDigest error.\n",
1033 opcode, rejected_pdu.itt);
1034 break;
1035 case ISCSI_REASON_IMM_CMD_REJECT:
1036 iscsi_conn_printk(KERN_ERR, conn,
1037 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1038 "immediate commands.\n",
1039 opcode, rejected_pdu.itt);
1041 * We only send one TMF at a time so if the target could not
1042 * handle it, then it should get fixed (RFC mandates that
1043 * a target can handle one immediate TMF per conn).
1045 * For nops-outs, we could have sent more than one if
1046 * the target is sending us lots of nop-ins
1048 if (opcode != ISCSI_OP_NOOP_OUT)
1049 return 0;
1051 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1053 * nop-out in response to target's nop-out rejected.
1054 * Just resend.
1056 /* In RX path we are under back lock */
1057 spin_unlock(&conn->session->back_lock);
1058 spin_lock(&conn->session->frwd_lock);
1059 iscsi_send_nopout(conn,
1060 (struct iscsi_nopin*)&rejected_pdu);
1061 spin_unlock(&conn->session->frwd_lock);
1062 spin_lock(&conn->session->back_lock);
1063 } else {
1064 struct iscsi_task *task;
1066 * Our nop as ping got dropped. We know the target
1067 * and transport are ok so just clean up
1069 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1070 if (!task) {
1071 iscsi_conn_printk(KERN_ERR, conn,
1072 "Invalid pdu reject. Could "
1073 "not lookup rejected task.\n");
1074 rc = ISCSI_ERR_BAD_ITT;
1075 } else
1076 rc = iscsi_nop_out_rsp(task,
1077 (struct iscsi_nopin*)&rejected_pdu,
1078 NULL, 0);
1080 break;
1081 default:
1082 iscsi_conn_printk(KERN_ERR, conn,
1083 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1084 "code 0x%x\n", rejected_pdu.opcode,
1085 rejected_pdu.itt, reject->reason);
1086 break;
1088 return rc;
1092 * iscsi_itt_to_task - look up task by itt
1093 * @conn: iscsi connection
1094 * @itt: itt
1096 * This should be used for mgmt tasks like login and nops, or if
1097 * the LDD's itt space does not include the session age.
1099 * The session back_lock must be held.
1101 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1103 struct iscsi_session *session = conn->session;
1104 int i;
1106 if (itt == RESERVED_ITT)
1107 return NULL;
1109 if (session->tt->parse_pdu_itt)
1110 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1111 else
1112 i = get_itt(itt);
1113 if (i >= session->cmds_max)
1114 return NULL;
1116 return session->cmds[i];
1118 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1121 * __iscsi_complete_pdu - complete pdu
1122 * @conn: iscsi conn
1123 * @hdr: iscsi header
1124 * @data: data buffer
1125 * @datalen: len of data buffer
1127 * Completes pdu processing by freeing any resources allocated at
1128 * queuecommand or send generic. session back_lock must be held and verify
1129 * itt must have been called.
1131 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1132 char *data, int datalen)
1134 struct iscsi_session *session = conn->session;
1135 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1136 struct iscsi_task *task;
1137 uint32_t itt;
1139 conn->last_recv = jiffies;
1140 rc = iscsi_verify_itt(conn, hdr->itt);
1141 if (rc)
1142 return rc;
1144 if (hdr->itt != RESERVED_ITT)
1145 itt = get_itt(hdr->itt);
1146 else
1147 itt = ~0U;
1149 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1150 opcode, conn->id, itt, datalen);
1152 if (itt == ~0U) {
1153 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1155 switch(opcode) {
1156 case ISCSI_OP_NOOP_IN:
1157 if (datalen) {
1158 rc = ISCSI_ERR_PROTO;
1159 break;
1162 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1163 break;
1165 /* In RX path we are under back lock */
1166 spin_unlock(&session->back_lock);
1167 spin_lock(&session->frwd_lock);
1168 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1169 spin_unlock(&session->frwd_lock);
1170 spin_lock(&session->back_lock);
1171 break;
1172 case ISCSI_OP_REJECT:
1173 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1174 break;
1175 case ISCSI_OP_ASYNC_EVENT:
1176 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1177 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1178 rc = ISCSI_ERR_CONN_FAILED;
1179 break;
1180 default:
1181 rc = ISCSI_ERR_BAD_OPCODE;
1182 break;
1184 goto out;
1187 switch(opcode) {
1188 case ISCSI_OP_SCSI_CMD_RSP:
1189 case ISCSI_OP_SCSI_DATA_IN:
1190 task = iscsi_itt_to_ctask(conn, hdr->itt);
1191 if (!task)
1192 return ISCSI_ERR_BAD_ITT;
1193 task->last_xfer = jiffies;
1194 break;
1195 case ISCSI_OP_R2T:
1197 * LLD handles R2Ts if they need to.
1199 return 0;
1200 case ISCSI_OP_LOGOUT_RSP:
1201 case ISCSI_OP_LOGIN_RSP:
1202 case ISCSI_OP_TEXT_RSP:
1203 case ISCSI_OP_SCSI_TMFUNC_RSP:
1204 case ISCSI_OP_NOOP_IN:
1205 task = iscsi_itt_to_task(conn, hdr->itt);
1206 if (!task)
1207 return ISCSI_ERR_BAD_ITT;
1208 break;
1209 default:
1210 return ISCSI_ERR_BAD_OPCODE;
1213 switch(opcode) {
1214 case ISCSI_OP_SCSI_CMD_RSP:
1215 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1216 break;
1217 case ISCSI_OP_SCSI_DATA_IN:
1218 iscsi_data_in_rsp(conn, hdr, task);
1219 break;
1220 case ISCSI_OP_LOGOUT_RSP:
1221 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1222 if (datalen) {
1223 rc = ISCSI_ERR_PROTO;
1224 break;
1226 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1227 goto recv_pdu;
1228 case ISCSI_OP_LOGIN_RSP:
1229 case ISCSI_OP_TEXT_RSP:
1230 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1232 * login related PDU's exp_statsn is handled in
1233 * userspace
1235 goto recv_pdu;
1236 case ISCSI_OP_SCSI_TMFUNC_RSP:
1237 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1238 if (datalen) {
1239 rc = ISCSI_ERR_PROTO;
1240 break;
1243 iscsi_tmf_rsp(conn, hdr);
1244 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1245 break;
1246 case ISCSI_OP_NOOP_IN:
1247 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1248 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1249 rc = ISCSI_ERR_PROTO;
1250 break;
1252 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1254 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1255 data, datalen);
1256 break;
1257 default:
1258 rc = ISCSI_ERR_BAD_OPCODE;
1259 break;
1262 out:
1263 return rc;
1264 recv_pdu:
1265 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1266 rc = ISCSI_ERR_CONN_FAILED;
1267 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1268 return rc;
1270 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1272 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1273 char *data, int datalen)
1275 int rc;
1277 spin_lock(&conn->session->back_lock);
1278 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1279 spin_unlock(&conn->session->back_lock);
1280 return rc;
1282 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1284 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1286 struct iscsi_session *session = conn->session;
1287 int age = 0, i = 0;
1289 if (itt == RESERVED_ITT)
1290 return 0;
1292 if (session->tt->parse_pdu_itt)
1293 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1294 else {
1295 i = get_itt(itt);
1296 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1299 if (age != session->age) {
1300 iscsi_conn_printk(KERN_ERR, conn,
1301 "received itt %x expected session age (%x)\n",
1302 (__force u32)itt, session->age);
1303 return ISCSI_ERR_BAD_ITT;
1306 if (i >= session->cmds_max) {
1307 iscsi_conn_printk(KERN_ERR, conn,
1308 "received invalid itt index %u (max cmds "
1309 "%u.\n", i, session->cmds_max);
1310 return ISCSI_ERR_BAD_ITT;
1312 return 0;
1314 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1317 * iscsi_itt_to_ctask - look up ctask by itt
1318 * @conn: iscsi connection
1319 * @itt: itt
1321 * This should be used for cmd tasks.
1323 * The session back_lock must be held.
1325 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1327 struct iscsi_task *task;
1329 if (iscsi_verify_itt(conn, itt))
1330 return NULL;
1332 task = iscsi_itt_to_task(conn, itt);
1333 if (!task || !task->sc)
1334 return NULL;
1336 if (task->sc->SCp.phase != conn->session->age) {
1337 iscsi_session_printk(KERN_ERR, conn->session,
1338 "task's session age %d, expected %d\n",
1339 task->sc->SCp.phase, conn->session->age);
1340 return NULL;
1343 return task;
1345 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1347 void iscsi_session_failure(struct iscsi_session *session,
1348 enum iscsi_err err)
1350 struct iscsi_conn *conn;
1351 struct device *dev;
1353 spin_lock_bh(&session->frwd_lock);
1354 conn = session->leadconn;
1355 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1356 spin_unlock_bh(&session->frwd_lock);
1357 return;
1360 dev = get_device(&conn->cls_conn->dev);
1361 spin_unlock_bh(&session->frwd_lock);
1362 if (!dev)
1363 return;
1365 * if the host is being removed bypass the connection
1366 * recovery initialization because we are going to kill
1367 * the session.
1369 if (err == ISCSI_ERR_INVALID_HOST)
1370 iscsi_conn_error_event(conn->cls_conn, err);
1371 else
1372 iscsi_conn_failure(conn, err);
1373 put_device(dev);
1375 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1377 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1379 struct iscsi_session *session = conn->session;
1381 spin_lock_bh(&session->frwd_lock);
1382 if (session->state == ISCSI_STATE_FAILED) {
1383 spin_unlock_bh(&session->frwd_lock);
1384 return;
1387 if (conn->stop_stage == 0)
1388 session->state = ISCSI_STATE_FAILED;
1389 spin_unlock_bh(&session->frwd_lock);
1391 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1392 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1393 iscsi_conn_error_event(conn->cls_conn, err);
1395 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1397 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1399 struct iscsi_session *session = conn->session;
1402 * Check for iSCSI window and take care of CmdSN wrap-around
1404 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1405 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1406 "%u MaxCmdSN %u CmdSN %u/%u\n",
1407 session->exp_cmdsn, session->max_cmdsn,
1408 session->cmdsn, session->queued_cmdsn);
1409 return -ENOSPC;
1411 return 0;
1414 static int iscsi_xmit_task(struct iscsi_conn *conn)
1416 struct iscsi_task *task = conn->task;
1417 int rc;
1419 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1420 return -ENODATA;
1422 spin_lock_bh(&conn->session->back_lock);
1423 if (conn->task == NULL) {
1424 spin_unlock_bh(&conn->session->back_lock);
1425 return -ENODATA;
1427 __iscsi_get_task(task);
1428 spin_unlock_bh(&conn->session->back_lock);
1429 spin_unlock_bh(&conn->session->frwd_lock);
1430 rc = conn->session->tt->xmit_task(task);
1431 spin_lock_bh(&conn->session->frwd_lock);
1432 if (!rc) {
1433 /* done with this task */
1434 task->last_xfer = jiffies;
1435 conn->task = NULL;
1437 /* regular RX path uses back_lock */
1438 spin_lock(&conn->session->back_lock);
1439 __iscsi_put_task(task);
1440 spin_unlock(&conn->session->back_lock);
1441 return rc;
1445 * iscsi_requeue_task - requeue task to run from session workqueue
1446 * @task: task to requeue
1448 * LLDs that need to run a task from the session workqueue should call
1449 * this. The session frwd_lock must be held. This should only be called
1450 * by software drivers.
1452 void iscsi_requeue_task(struct iscsi_task *task)
1454 struct iscsi_conn *conn = task->conn;
1457 * this may be on the requeue list already if the xmit_task callout
1458 * is handling the r2ts while we are adding new ones
1460 spin_lock_bh(&conn->taskqueuelock);
1461 if (list_empty(&task->running))
1462 list_add_tail(&task->running, &conn->requeue);
1463 spin_unlock_bh(&conn->taskqueuelock);
1464 iscsi_conn_queue_work(conn);
1466 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1469 * iscsi_data_xmit - xmit any command into the scheduled connection
1470 * @conn: iscsi connection
1472 * Notes:
1473 * The function can return -EAGAIN in which case the caller must
1474 * re-schedule it again later or recover. '0' return code means
1475 * successful xmit.
1477 static int iscsi_data_xmit(struct iscsi_conn *conn)
1479 struct iscsi_task *task;
1480 int rc = 0;
1482 spin_lock_bh(&conn->session->frwd_lock);
1483 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1484 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1485 spin_unlock_bh(&conn->session->frwd_lock);
1486 return -ENODATA;
1489 if (conn->task) {
1490 rc = iscsi_xmit_task(conn);
1491 if (rc)
1492 goto done;
1496 * process mgmt pdus like nops before commands since we should
1497 * only have one nop-out as a ping from us and targets should not
1498 * overflow us with nop-ins
1500 spin_lock_bh(&conn->taskqueuelock);
1501 check_mgmt:
1502 while (!list_empty(&conn->mgmtqueue)) {
1503 conn->task = list_entry(conn->mgmtqueue.next,
1504 struct iscsi_task, running);
1505 list_del_init(&conn->task->running);
1506 spin_unlock_bh(&conn->taskqueuelock);
1507 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1508 /* regular RX path uses back_lock */
1509 spin_lock_bh(&conn->session->back_lock);
1510 __iscsi_put_task(conn->task);
1511 spin_unlock_bh(&conn->session->back_lock);
1512 conn->task = NULL;
1513 spin_lock_bh(&conn->taskqueuelock);
1514 continue;
1516 rc = iscsi_xmit_task(conn);
1517 if (rc)
1518 goto done;
1519 spin_lock_bh(&conn->taskqueuelock);
1522 /* process pending command queue */
1523 while (!list_empty(&conn->cmdqueue)) {
1524 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1525 running);
1526 list_del_init(&conn->task->running);
1527 spin_unlock_bh(&conn->taskqueuelock);
1528 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1529 fail_scsi_task(conn->task, DID_IMM_RETRY);
1530 spin_lock_bh(&conn->taskqueuelock);
1531 continue;
1533 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1534 if (rc) {
1535 if (rc == -ENOMEM || rc == -EACCES) {
1536 spin_lock_bh(&conn->taskqueuelock);
1537 list_add_tail(&conn->task->running,
1538 &conn->cmdqueue);
1539 conn->task = NULL;
1540 spin_unlock_bh(&conn->taskqueuelock);
1541 goto done;
1542 } else
1543 fail_scsi_task(conn->task, DID_ABORT);
1544 spin_lock_bh(&conn->taskqueuelock);
1545 continue;
1547 rc = iscsi_xmit_task(conn);
1548 if (rc)
1549 goto done;
1551 * we could continuously get new task requests so
1552 * we need to check the mgmt queue for nops that need to
1553 * be sent to aviod starvation
1555 spin_lock_bh(&conn->taskqueuelock);
1556 if (!list_empty(&conn->mgmtqueue))
1557 goto check_mgmt;
1560 while (!list_empty(&conn->requeue)) {
1562 * we always do fastlogout - conn stop code will clean up.
1564 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1565 break;
1567 task = list_entry(conn->requeue.next, struct iscsi_task,
1568 running);
1569 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1570 break;
1572 conn->task = task;
1573 list_del_init(&conn->task->running);
1574 conn->task->state = ISCSI_TASK_RUNNING;
1575 spin_unlock_bh(&conn->taskqueuelock);
1576 rc = iscsi_xmit_task(conn);
1577 if (rc)
1578 goto done;
1579 spin_lock_bh(&conn->taskqueuelock);
1580 if (!list_empty(&conn->mgmtqueue))
1581 goto check_mgmt;
1583 spin_unlock_bh(&conn->taskqueuelock);
1584 spin_unlock_bh(&conn->session->frwd_lock);
1585 return -ENODATA;
1587 done:
1588 spin_unlock_bh(&conn->session->frwd_lock);
1589 return rc;
1592 static void iscsi_xmitworker(struct work_struct *work)
1594 struct iscsi_conn *conn =
1595 container_of(work, struct iscsi_conn, xmitwork);
1596 int rc;
1598 * serialize Xmit worker on a per-connection basis.
1600 do {
1601 rc = iscsi_data_xmit(conn);
1602 } while (rc >= 0 || rc == -EAGAIN);
1605 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1606 struct scsi_cmnd *sc)
1608 struct iscsi_task *task;
1610 if (!kfifo_out(&conn->session->cmdpool.queue,
1611 (void *) &task, sizeof(void *)))
1612 return NULL;
1614 sc->SCp.phase = conn->session->age;
1615 sc->SCp.ptr = (char *) task;
1617 refcount_set(&task->refcount, 1);
1618 task->state = ISCSI_TASK_PENDING;
1619 task->conn = conn;
1620 task->sc = sc;
1621 task->have_checked_conn = false;
1622 task->last_timeout = jiffies;
1623 task->last_xfer = jiffies;
1624 task->protected = false;
1625 INIT_LIST_HEAD(&task->running);
1626 return task;
1629 enum {
1630 FAILURE_BAD_HOST = 1,
1631 FAILURE_SESSION_FAILED,
1632 FAILURE_SESSION_FREED,
1633 FAILURE_WINDOW_CLOSED,
1634 FAILURE_OOM,
1635 FAILURE_SESSION_TERMINATE,
1636 FAILURE_SESSION_IN_RECOVERY,
1637 FAILURE_SESSION_RECOVERY_TIMEOUT,
1638 FAILURE_SESSION_LOGGING_OUT,
1639 FAILURE_SESSION_NOT_READY,
1642 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1644 struct iscsi_cls_session *cls_session;
1645 struct iscsi_host *ihost;
1646 int reason = 0;
1647 struct iscsi_session *session;
1648 struct iscsi_conn *conn;
1649 struct iscsi_task *task = NULL;
1651 sc->result = 0;
1652 sc->SCp.ptr = NULL;
1654 ihost = shost_priv(host);
1656 cls_session = starget_to_session(scsi_target(sc->device));
1657 session = cls_session->dd_data;
1658 spin_lock_bh(&session->frwd_lock);
1660 reason = iscsi_session_chkready(cls_session);
1661 if (reason) {
1662 sc->result = reason;
1663 goto fault;
1666 if (session->state != ISCSI_STATE_LOGGED_IN) {
1668 * to handle the race between when we set the recovery state
1669 * and block the session we requeue here (commands could
1670 * be entering our queuecommand while a block is starting
1671 * up because the block code is not locked)
1673 switch (session->state) {
1674 case ISCSI_STATE_FAILED:
1676 * cmds should fail during shutdown, if the session
1677 * state is bad, allowing completion to happen
1679 if (unlikely(system_state != SYSTEM_RUNNING)) {
1680 reason = FAILURE_SESSION_FAILED;
1681 sc->result = DID_NO_CONNECT << 16;
1682 break;
1684 fallthrough;
1685 case ISCSI_STATE_IN_RECOVERY:
1686 reason = FAILURE_SESSION_IN_RECOVERY;
1687 sc->result = DID_IMM_RETRY << 16;
1688 break;
1689 case ISCSI_STATE_LOGGING_OUT:
1690 reason = FAILURE_SESSION_LOGGING_OUT;
1691 sc->result = DID_IMM_RETRY << 16;
1692 break;
1693 case ISCSI_STATE_RECOVERY_FAILED:
1694 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1695 sc->result = DID_TRANSPORT_FAILFAST << 16;
1696 break;
1697 case ISCSI_STATE_TERMINATE:
1698 reason = FAILURE_SESSION_TERMINATE;
1699 sc->result = DID_NO_CONNECT << 16;
1700 break;
1701 default:
1702 reason = FAILURE_SESSION_FREED;
1703 sc->result = DID_NO_CONNECT << 16;
1705 goto fault;
1708 conn = session->leadconn;
1709 if (!conn) {
1710 reason = FAILURE_SESSION_FREED;
1711 sc->result = DID_NO_CONNECT << 16;
1712 goto fault;
1715 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1716 reason = FAILURE_SESSION_IN_RECOVERY;
1717 sc->result = DID_REQUEUE << 16;
1718 goto fault;
1721 if (iscsi_check_cmdsn_window_closed(conn)) {
1722 reason = FAILURE_WINDOW_CLOSED;
1723 goto reject;
1726 task = iscsi_alloc_task(conn, sc);
1727 if (!task) {
1728 reason = FAILURE_OOM;
1729 goto reject;
1732 if (!ihost->workq) {
1733 reason = iscsi_prep_scsi_cmd_pdu(task);
1734 if (reason) {
1735 if (reason == -ENOMEM || reason == -EACCES) {
1736 reason = FAILURE_OOM;
1737 goto prepd_reject;
1738 } else {
1739 sc->result = DID_ABORT << 16;
1740 goto prepd_fault;
1743 if (session->tt->xmit_task(task)) {
1744 session->cmdsn--;
1745 reason = FAILURE_SESSION_NOT_READY;
1746 goto prepd_reject;
1748 } else {
1749 spin_lock_bh(&conn->taskqueuelock);
1750 list_add_tail(&task->running, &conn->cmdqueue);
1751 spin_unlock_bh(&conn->taskqueuelock);
1752 iscsi_conn_queue_work(conn);
1755 session->queued_cmdsn++;
1756 spin_unlock_bh(&session->frwd_lock);
1757 return 0;
1759 prepd_reject:
1760 spin_lock_bh(&session->back_lock);
1761 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1762 spin_unlock_bh(&session->back_lock);
1763 reject:
1764 spin_unlock_bh(&session->frwd_lock);
1765 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1766 sc->cmnd[0], reason);
1767 return SCSI_MLQUEUE_TARGET_BUSY;
1769 prepd_fault:
1770 spin_lock_bh(&session->back_lock);
1771 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1772 spin_unlock_bh(&session->back_lock);
1773 fault:
1774 spin_unlock_bh(&session->frwd_lock);
1775 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1776 sc->cmnd[0], reason);
1777 scsi_set_resid(sc, scsi_bufflen(sc));
1778 sc->scsi_done(sc);
1779 return 0;
1781 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1783 int iscsi_target_alloc(struct scsi_target *starget)
1785 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1786 struct iscsi_session *session = cls_session->dd_data;
1788 starget->can_queue = session->scsi_cmds_max;
1789 return 0;
1791 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1793 static void iscsi_tmf_timedout(struct timer_list *t)
1795 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
1796 struct iscsi_session *session = conn->session;
1798 spin_lock(&session->frwd_lock);
1799 if (conn->tmf_state == TMF_QUEUED) {
1800 conn->tmf_state = TMF_TIMEDOUT;
1801 ISCSI_DBG_EH(session, "tmf timedout\n");
1802 /* unblock eh_abort() */
1803 wake_up(&conn->ehwait);
1805 spin_unlock(&session->frwd_lock);
1808 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1809 struct iscsi_tm *hdr, int age,
1810 int timeout)
1811 __must_hold(&session->frwd_lock)
1813 struct iscsi_session *session = conn->session;
1814 struct iscsi_task *task;
1816 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1817 NULL, 0);
1818 if (!task) {
1819 spin_unlock_bh(&session->frwd_lock);
1820 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1821 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1822 spin_lock_bh(&session->frwd_lock);
1823 return -EPERM;
1825 conn->tmfcmd_pdus_cnt++;
1826 conn->tmf_timer.expires = timeout * HZ + jiffies;
1827 add_timer(&conn->tmf_timer);
1828 ISCSI_DBG_EH(session, "tmf set timeout\n");
1830 spin_unlock_bh(&session->frwd_lock);
1831 mutex_unlock(&session->eh_mutex);
1834 * block eh thread until:
1836 * 1) tmf response
1837 * 2) tmf timeout
1838 * 3) session is terminated or restarted or userspace has
1839 * given up on recovery
1841 wait_event_interruptible(conn->ehwait, age != session->age ||
1842 session->state != ISCSI_STATE_LOGGED_IN ||
1843 conn->tmf_state != TMF_QUEUED);
1844 if (signal_pending(current))
1845 flush_signals(current);
1846 del_timer_sync(&conn->tmf_timer);
1848 mutex_lock(&session->eh_mutex);
1849 spin_lock_bh(&session->frwd_lock);
1850 /* if the session drops it will clean up the task */
1851 if (age != session->age ||
1852 session->state != ISCSI_STATE_LOGGED_IN)
1853 return -ENOTCONN;
1854 return 0;
1858 * Fail commands. session lock held and recv side suspended and xmit
1859 * thread flushed
1861 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1863 struct iscsi_task *task;
1864 int i;
1866 for (i = 0; i < conn->session->cmds_max; i++) {
1867 task = conn->session->cmds[i];
1868 if (!task->sc || task->state == ISCSI_TASK_FREE)
1869 continue;
1871 if (lun != -1 && lun != task->sc->device->lun)
1872 continue;
1874 ISCSI_DBG_SESSION(conn->session,
1875 "failing sc %p itt 0x%x state %d\n",
1876 task->sc, task->itt, task->state);
1877 fail_scsi_task(task, error);
1882 * iscsi_suspend_queue - suspend iscsi_queuecommand
1883 * @conn: iscsi conn to stop queueing IO on
1885 * This grabs the session frwd_lock to make sure no one is in
1886 * xmit_task/queuecommand, and then sets suspend to prevent
1887 * new commands from being queued. This only needs to be called
1888 * by offload drivers that need to sync a path like ep disconnect
1889 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1890 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1892 void iscsi_suspend_queue(struct iscsi_conn *conn)
1894 spin_lock_bh(&conn->session->frwd_lock);
1895 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1896 spin_unlock_bh(&conn->session->frwd_lock);
1898 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1901 * iscsi_suspend_tx - suspend iscsi_data_xmit
1902 * @conn: iscsi conn tp stop processing IO on.
1904 * This function sets the suspend bit to prevent iscsi_data_xmit
1905 * from sending new IO, and if work is queued on the xmit thread
1906 * it will wait for it to be completed.
1908 void iscsi_suspend_tx(struct iscsi_conn *conn)
1910 struct Scsi_Host *shost = conn->session->host;
1911 struct iscsi_host *ihost = shost_priv(shost);
1913 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1914 if (ihost->workq)
1915 flush_workqueue(ihost->workq);
1917 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1919 static void iscsi_start_tx(struct iscsi_conn *conn)
1921 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1922 iscsi_conn_queue_work(conn);
1926 * We want to make sure a ping is in flight. It has timed out.
1927 * And we are not busy processing a pdu that is making
1928 * progress but got started before the ping and is taking a while
1929 * to complete so the ping is just stuck behind it in a queue.
1931 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1933 if (READ_ONCE(conn->ping_task) &&
1934 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1935 (conn->ping_timeout * HZ), jiffies))
1936 return 1;
1937 else
1938 return 0;
1941 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1943 enum blk_eh_timer_return rc = BLK_EH_DONE;
1944 struct iscsi_task *task = NULL, *running_task;
1945 struct iscsi_cls_session *cls_session;
1946 struct iscsi_session *session;
1947 struct iscsi_conn *conn;
1948 int i;
1950 cls_session = starget_to_session(scsi_target(sc->device));
1951 session = cls_session->dd_data;
1953 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1955 spin_lock_bh(&session->frwd_lock);
1956 task = (struct iscsi_task *)sc->SCp.ptr;
1957 if (!task) {
1959 * Raced with completion. Blk layer has taken ownership
1960 * so let timeout code complete it now.
1962 rc = BLK_EH_DONE;
1963 goto done;
1966 if (session->state != ISCSI_STATE_LOGGED_IN) {
1968 * During shutdown, if session is prematurely disconnected,
1969 * recovery won't happen and there will be hung cmds. Not
1970 * handling cmds would trigger EH, also bad in this case.
1971 * Instead, handle cmd, allow completion to happen and let
1972 * upper layer to deal with the result.
1974 if (unlikely(system_state != SYSTEM_RUNNING)) {
1975 sc->result = DID_NO_CONNECT << 16;
1976 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
1977 rc = BLK_EH_DONE;
1978 goto done;
1981 * We are probably in the middle of iscsi recovery so let
1982 * that complete and handle the error.
1984 rc = BLK_EH_RESET_TIMER;
1985 goto done;
1988 conn = session->leadconn;
1989 if (!conn) {
1990 /* In the middle of shuting down */
1991 rc = BLK_EH_RESET_TIMER;
1992 goto done;
1996 * If we have sent (at least queued to the network layer) a pdu or
1997 * recvd one for the task since the last timeout ask for
1998 * more time. If on the next timeout we have not made progress
1999 * we can check if it is the task or connection when we send the
2000 * nop as a ping.
2002 if (time_after(task->last_xfer, task->last_timeout)) {
2003 ISCSI_DBG_EH(session, "Command making progress. Asking "
2004 "scsi-ml for more time to complete. "
2005 "Last data xfer at %lu. Last timeout was at "
2006 "%lu\n.", task->last_xfer, task->last_timeout);
2007 task->have_checked_conn = false;
2008 rc = BLK_EH_RESET_TIMER;
2009 goto done;
2012 if (!conn->recv_timeout && !conn->ping_timeout)
2013 goto done;
2015 * if the ping timedout then we are in the middle of cleaning up
2016 * and can let the iscsi eh handle it
2018 if (iscsi_has_ping_timed_out(conn)) {
2019 rc = BLK_EH_RESET_TIMER;
2020 goto done;
2023 for (i = 0; i < conn->session->cmds_max; i++) {
2024 running_task = conn->session->cmds[i];
2025 if (!running_task->sc || running_task == task ||
2026 running_task->state != ISCSI_TASK_RUNNING)
2027 continue;
2030 * Only check if cmds started before this one have made
2031 * progress, or this could never fail
2033 if (time_after(running_task->sc->jiffies_at_alloc,
2034 task->sc->jiffies_at_alloc))
2035 continue;
2037 if (time_after(running_task->last_xfer, task->last_timeout)) {
2039 * This task has not made progress, but a task
2040 * started before us has transferred data since
2041 * we started/last-checked. We could be queueing
2042 * too many tasks or the LU is bad.
2044 * If the device is bad the cmds ahead of us on
2045 * other devs will complete, and this loop will
2046 * eventually fail starting the scsi eh.
2048 ISCSI_DBG_EH(session, "Command has not made progress "
2049 "but commands ahead of it have. "
2050 "Asking scsi-ml for more time to "
2051 "complete. Our last xfer vs running task "
2052 "last xfer %lu/%lu. Last check %lu.\n",
2053 task->last_xfer, running_task->last_xfer,
2054 task->last_timeout);
2055 rc = BLK_EH_RESET_TIMER;
2056 goto done;
2060 /* Assumes nop timeout is shorter than scsi cmd timeout */
2061 if (task->have_checked_conn)
2062 goto done;
2065 * Checking the transport already or nop from a cmd timeout still
2066 * running
2068 if (READ_ONCE(conn->ping_task)) {
2069 task->have_checked_conn = true;
2070 rc = BLK_EH_RESET_TIMER;
2071 goto done;
2074 /* Make sure there is a transport check done */
2075 iscsi_send_nopout(conn, NULL);
2076 task->have_checked_conn = true;
2077 rc = BLK_EH_RESET_TIMER;
2079 done:
2080 if (task)
2081 task->last_timeout = jiffies;
2082 spin_unlock_bh(&session->frwd_lock);
2083 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2084 "timer reset" : "shutdown or nh");
2085 return rc;
2087 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2089 static void iscsi_check_transport_timeouts(struct timer_list *t)
2091 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
2092 struct iscsi_session *session = conn->session;
2093 unsigned long recv_timeout, next_timeout = 0, last_recv;
2095 spin_lock(&session->frwd_lock);
2096 if (session->state != ISCSI_STATE_LOGGED_IN)
2097 goto done;
2099 recv_timeout = conn->recv_timeout;
2100 if (!recv_timeout)
2101 goto done;
2103 recv_timeout *= HZ;
2104 last_recv = conn->last_recv;
2106 if (iscsi_has_ping_timed_out(conn)) {
2107 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2108 "expired, recv timeout %d, last rx %lu, "
2109 "last ping %lu, now %lu\n",
2110 conn->ping_timeout, conn->recv_timeout,
2111 last_recv, conn->last_ping, jiffies);
2112 spin_unlock(&session->frwd_lock);
2113 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2114 return;
2117 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2118 /* send a ping to try to provoke some traffic */
2119 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2120 if (iscsi_send_nopout(conn, NULL))
2121 next_timeout = jiffies + (1 * HZ);
2122 else
2123 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2124 } else
2125 next_timeout = last_recv + recv_timeout;
2127 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2128 mod_timer(&conn->transport_timer, next_timeout);
2129 done:
2130 spin_unlock(&session->frwd_lock);
2133 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2134 struct iscsi_tm *hdr)
2136 memset(hdr, 0, sizeof(*hdr));
2137 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2138 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2139 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2140 hdr->lun = task->lun;
2141 hdr->rtt = task->hdr_itt;
2142 hdr->refcmdsn = task->cmdsn;
2145 int iscsi_eh_abort(struct scsi_cmnd *sc)
2147 struct iscsi_cls_session *cls_session;
2148 struct iscsi_session *session;
2149 struct iscsi_conn *conn;
2150 struct iscsi_task *task;
2151 struct iscsi_tm *hdr;
2152 int age;
2154 cls_session = starget_to_session(scsi_target(sc->device));
2155 session = cls_session->dd_data;
2157 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2159 mutex_lock(&session->eh_mutex);
2160 spin_lock_bh(&session->frwd_lock);
2162 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2163 * got the command.
2165 if (!sc->SCp.ptr) {
2166 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2167 "it completed.\n");
2168 spin_unlock_bh(&session->frwd_lock);
2169 mutex_unlock(&session->eh_mutex);
2170 return SUCCESS;
2174 * If we are not logged in or we have started a new session
2175 * then let the host reset code handle this
2177 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2178 sc->SCp.phase != session->age) {
2179 spin_unlock_bh(&session->frwd_lock);
2180 mutex_unlock(&session->eh_mutex);
2181 ISCSI_DBG_EH(session, "failing abort due to dropped "
2182 "session.\n");
2183 return FAILED;
2186 conn = session->leadconn;
2187 conn->eh_abort_cnt++;
2188 age = session->age;
2190 task = (struct iscsi_task *)sc->SCp.ptr;
2191 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2192 sc, task->itt);
2194 /* task completed before time out */
2195 if (!task->sc) {
2196 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2197 goto success;
2200 if (task->state == ISCSI_TASK_PENDING) {
2201 fail_scsi_task(task, DID_ABORT);
2202 goto success;
2205 /* only have one tmf outstanding at a time */
2206 if (conn->tmf_state != TMF_INITIAL)
2207 goto failed;
2208 conn->tmf_state = TMF_QUEUED;
2210 hdr = &conn->tmhdr;
2211 iscsi_prep_abort_task_pdu(task, hdr);
2213 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2214 goto failed;
2216 switch (conn->tmf_state) {
2217 case TMF_SUCCESS:
2218 spin_unlock_bh(&session->frwd_lock);
2220 * stop tx side incase the target had sent a abort rsp but
2221 * the initiator was still writing out data.
2223 iscsi_suspend_tx(conn);
2225 * we do not stop the recv side because targets have been
2226 * good and have never sent us a successful tmf response
2227 * then sent more data for the cmd.
2229 spin_lock_bh(&session->frwd_lock);
2230 fail_scsi_task(task, DID_ABORT);
2231 conn->tmf_state = TMF_INITIAL;
2232 memset(hdr, 0, sizeof(*hdr));
2233 spin_unlock_bh(&session->frwd_lock);
2234 iscsi_start_tx(conn);
2235 goto success_unlocked;
2236 case TMF_TIMEDOUT:
2237 spin_unlock_bh(&session->frwd_lock);
2238 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2239 goto failed_unlocked;
2240 case TMF_NOT_FOUND:
2241 if (!sc->SCp.ptr) {
2242 conn->tmf_state = TMF_INITIAL;
2243 memset(hdr, 0, sizeof(*hdr));
2244 /* task completed before tmf abort response */
2245 ISCSI_DBG_EH(session, "sc completed while abort in "
2246 "progress\n");
2247 goto success;
2249 fallthrough;
2250 default:
2251 conn->tmf_state = TMF_INITIAL;
2252 goto failed;
2255 success:
2256 spin_unlock_bh(&session->frwd_lock);
2257 success_unlocked:
2258 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2259 sc, task->itt);
2260 mutex_unlock(&session->eh_mutex);
2261 return SUCCESS;
2263 failed:
2264 spin_unlock_bh(&session->frwd_lock);
2265 failed_unlocked:
2266 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2267 task ? task->itt : 0);
2268 mutex_unlock(&session->eh_mutex);
2269 return FAILED;
2271 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2273 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2275 memset(hdr, 0, sizeof(*hdr));
2276 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2277 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2278 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2279 int_to_scsilun(sc->device->lun, &hdr->lun);
2280 hdr->rtt = RESERVED_ITT;
2283 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2285 struct iscsi_cls_session *cls_session;
2286 struct iscsi_session *session;
2287 struct iscsi_conn *conn;
2288 struct iscsi_tm *hdr;
2289 int rc = FAILED;
2291 cls_session = starget_to_session(scsi_target(sc->device));
2292 session = cls_session->dd_data;
2294 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2295 sc->device->lun);
2297 mutex_lock(&session->eh_mutex);
2298 spin_lock_bh(&session->frwd_lock);
2300 * Just check if we are not logged in. We cannot check for
2301 * the phase because the reset could come from a ioctl.
2303 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2304 goto unlock;
2305 conn = session->leadconn;
2307 /* only have one tmf outstanding at a time */
2308 if (conn->tmf_state != TMF_INITIAL)
2309 goto unlock;
2310 conn->tmf_state = TMF_QUEUED;
2312 hdr = &conn->tmhdr;
2313 iscsi_prep_lun_reset_pdu(sc, hdr);
2315 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2316 session->lu_reset_timeout)) {
2317 rc = FAILED;
2318 goto unlock;
2321 switch (conn->tmf_state) {
2322 case TMF_SUCCESS:
2323 break;
2324 case TMF_TIMEDOUT:
2325 spin_unlock_bh(&session->frwd_lock);
2326 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2327 goto done;
2328 default:
2329 conn->tmf_state = TMF_INITIAL;
2330 goto unlock;
2333 rc = SUCCESS;
2334 spin_unlock_bh(&session->frwd_lock);
2336 iscsi_suspend_tx(conn);
2338 spin_lock_bh(&session->frwd_lock);
2339 memset(hdr, 0, sizeof(*hdr));
2340 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2341 conn->tmf_state = TMF_INITIAL;
2342 spin_unlock_bh(&session->frwd_lock);
2344 iscsi_start_tx(conn);
2345 goto done;
2347 unlock:
2348 spin_unlock_bh(&session->frwd_lock);
2349 done:
2350 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2351 rc == SUCCESS ? "SUCCESS" : "FAILED");
2352 mutex_unlock(&session->eh_mutex);
2353 return rc;
2355 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2357 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2359 struct iscsi_session *session = cls_session->dd_data;
2361 spin_lock_bh(&session->frwd_lock);
2362 if (session->state != ISCSI_STATE_LOGGED_IN) {
2363 session->state = ISCSI_STATE_RECOVERY_FAILED;
2364 if (session->leadconn)
2365 wake_up(&session->leadconn->ehwait);
2367 spin_unlock_bh(&session->frwd_lock);
2369 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2372 * iscsi_eh_session_reset - drop session and attempt relogin
2373 * @sc: scsi command
2375 * This function will wait for a relogin, session termination from
2376 * userspace, or a recovery/replacement timeout.
2378 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2380 struct iscsi_cls_session *cls_session;
2381 struct iscsi_session *session;
2382 struct iscsi_conn *conn;
2384 cls_session = starget_to_session(scsi_target(sc->device));
2385 session = cls_session->dd_data;
2386 conn = session->leadconn;
2388 mutex_lock(&session->eh_mutex);
2389 spin_lock_bh(&session->frwd_lock);
2390 if (session->state == ISCSI_STATE_TERMINATE) {
2391 failed:
2392 ISCSI_DBG_EH(session,
2393 "failing session reset: Could not log back into "
2394 "%s [age %d]\n", session->targetname,
2395 session->age);
2396 spin_unlock_bh(&session->frwd_lock);
2397 mutex_unlock(&session->eh_mutex);
2398 return FAILED;
2401 spin_unlock_bh(&session->frwd_lock);
2402 mutex_unlock(&session->eh_mutex);
2404 * we drop the lock here but the leadconn cannot be destoyed while
2405 * we are in the scsi eh
2407 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2409 ISCSI_DBG_EH(session, "wait for relogin\n");
2410 wait_event_interruptible(conn->ehwait,
2411 session->state == ISCSI_STATE_TERMINATE ||
2412 session->state == ISCSI_STATE_LOGGED_IN ||
2413 session->state == ISCSI_STATE_RECOVERY_FAILED);
2414 if (signal_pending(current))
2415 flush_signals(current);
2417 mutex_lock(&session->eh_mutex);
2418 spin_lock_bh(&session->frwd_lock);
2419 if (session->state == ISCSI_STATE_LOGGED_IN) {
2420 ISCSI_DBG_EH(session,
2421 "session reset succeeded for %s,%s\n",
2422 session->targetname, conn->persistent_address);
2423 } else
2424 goto failed;
2425 spin_unlock_bh(&session->frwd_lock);
2426 mutex_unlock(&session->eh_mutex);
2427 return SUCCESS;
2429 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2431 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2433 memset(hdr, 0, sizeof(*hdr));
2434 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2435 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2436 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2437 hdr->rtt = RESERVED_ITT;
2441 * iscsi_eh_target_reset - reset target
2442 * @sc: scsi command
2444 * This will attempt to send a warm target reset.
2446 static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2448 struct iscsi_cls_session *cls_session;
2449 struct iscsi_session *session;
2450 struct iscsi_conn *conn;
2451 struct iscsi_tm *hdr;
2452 int rc = FAILED;
2454 cls_session = starget_to_session(scsi_target(sc->device));
2455 session = cls_session->dd_data;
2457 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2458 session->targetname);
2460 mutex_lock(&session->eh_mutex);
2461 spin_lock_bh(&session->frwd_lock);
2463 * Just check if we are not logged in. We cannot check for
2464 * the phase because the reset could come from a ioctl.
2466 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2467 goto unlock;
2468 conn = session->leadconn;
2470 /* only have one tmf outstanding at a time */
2471 if (conn->tmf_state != TMF_INITIAL)
2472 goto unlock;
2473 conn->tmf_state = TMF_QUEUED;
2475 hdr = &conn->tmhdr;
2476 iscsi_prep_tgt_reset_pdu(sc, hdr);
2478 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2479 session->tgt_reset_timeout)) {
2480 rc = FAILED;
2481 goto unlock;
2484 switch (conn->tmf_state) {
2485 case TMF_SUCCESS:
2486 break;
2487 case TMF_TIMEDOUT:
2488 spin_unlock_bh(&session->frwd_lock);
2489 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2490 goto done;
2491 default:
2492 conn->tmf_state = TMF_INITIAL;
2493 goto unlock;
2496 rc = SUCCESS;
2497 spin_unlock_bh(&session->frwd_lock);
2499 iscsi_suspend_tx(conn);
2501 spin_lock_bh(&session->frwd_lock);
2502 memset(hdr, 0, sizeof(*hdr));
2503 fail_scsi_tasks(conn, -1, DID_ERROR);
2504 conn->tmf_state = TMF_INITIAL;
2505 spin_unlock_bh(&session->frwd_lock);
2507 iscsi_start_tx(conn);
2508 goto done;
2510 unlock:
2511 spin_unlock_bh(&session->frwd_lock);
2512 done:
2513 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2514 rc == SUCCESS ? "SUCCESS" : "FAILED");
2515 mutex_unlock(&session->eh_mutex);
2516 return rc;
2520 * iscsi_eh_recover_target - reset target and possibly the session
2521 * @sc: scsi command
2523 * This will attempt to send a warm target reset. If that fails,
2524 * we will escalate to ERL0 session recovery.
2526 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2528 int rc;
2530 rc = iscsi_eh_target_reset(sc);
2531 if (rc == FAILED)
2532 rc = iscsi_eh_session_reset(sc);
2533 return rc;
2535 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2538 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2539 * should be accessed via kfifo_{get,put} on q->queue.
2540 * Optionally, the caller can obtain the array of object pointers
2541 * by passing in a non-NULL @items pointer
2544 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2546 int i, num_arrays = 1;
2548 memset(q, 0, sizeof(*q));
2550 q->max = max;
2552 /* If the user passed an items pointer, he wants a copy of
2553 * the array. */
2554 if (items)
2555 num_arrays++;
2556 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
2557 if (q->pool == NULL)
2558 return -ENOMEM;
2560 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2562 for (i = 0; i < max; i++) {
2563 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2564 if (q->pool[i] == NULL) {
2565 q->max = i;
2566 goto enomem;
2568 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2571 if (items) {
2572 *items = q->pool + max;
2573 memcpy(*items, q->pool, max * sizeof(void *));
2576 return 0;
2578 enomem:
2579 iscsi_pool_free(q);
2580 return -ENOMEM;
2582 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2584 void iscsi_pool_free(struct iscsi_pool *q)
2586 int i;
2588 for (i = 0; i < q->max; i++)
2589 kfree(q->pool[i]);
2590 kvfree(q->pool);
2592 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2595 * iscsi_host_add - add host to system
2596 * @shost: scsi host
2597 * @pdev: parent device
2599 * This should be called by partial offload and software iscsi drivers
2600 * to add a host to the system.
2602 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2604 if (!shost->can_queue)
2605 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2607 if (!shost->cmd_per_lun)
2608 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2610 return scsi_add_host(shost, pdev);
2612 EXPORT_SYMBOL_GPL(iscsi_host_add);
2615 * iscsi_host_alloc - allocate a host and driver data
2616 * @sht: scsi host template
2617 * @dd_data_size: driver host data size
2618 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2620 * This should be called by partial offload and software iscsi drivers.
2621 * To access the driver specific memory use the iscsi_host_priv() macro.
2623 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2624 int dd_data_size, bool xmit_can_sleep)
2626 struct Scsi_Host *shost;
2627 struct iscsi_host *ihost;
2629 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2630 if (!shost)
2631 return NULL;
2632 ihost = shost_priv(shost);
2634 if (xmit_can_sleep) {
2635 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2636 "iscsi_q_%d", shost->host_no);
2637 ihost->workq = alloc_workqueue("%s",
2638 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
2639 1, ihost->workq_name);
2640 if (!ihost->workq)
2641 goto free_host;
2644 spin_lock_init(&ihost->lock);
2645 ihost->state = ISCSI_HOST_SETUP;
2646 ihost->num_sessions = 0;
2647 init_waitqueue_head(&ihost->session_removal_wq);
2648 return shost;
2650 free_host:
2651 scsi_host_put(shost);
2652 return NULL;
2654 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2656 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2658 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2662 * iscsi_host_remove - remove host and sessions
2663 * @shost: scsi host
2665 * If there are any sessions left, this will initiate the removal and wait
2666 * for the completion.
2668 void iscsi_host_remove(struct Scsi_Host *shost)
2670 struct iscsi_host *ihost = shost_priv(shost);
2671 unsigned long flags;
2673 spin_lock_irqsave(&ihost->lock, flags);
2674 ihost->state = ISCSI_HOST_REMOVED;
2675 spin_unlock_irqrestore(&ihost->lock, flags);
2677 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2678 wait_event_interruptible(ihost->session_removal_wq,
2679 ihost->num_sessions == 0);
2680 if (signal_pending(current))
2681 flush_signals(current);
2683 scsi_remove_host(shost);
2684 if (ihost->workq)
2685 destroy_workqueue(ihost->workq);
2687 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2689 void iscsi_host_free(struct Scsi_Host *shost)
2691 struct iscsi_host *ihost = shost_priv(shost);
2693 kfree(ihost->netdev);
2694 kfree(ihost->hwaddress);
2695 kfree(ihost->initiatorname);
2696 scsi_host_put(shost);
2698 EXPORT_SYMBOL_GPL(iscsi_host_free);
2700 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2702 struct iscsi_host *ihost = shost_priv(shost);
2703 unsigned long flags;
2705 shost = scsi_host_get(shost);
2706 if (!shost) {
2707 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2708 "of session teardown event because host already "
2709 "removed.\n");
2710 return;
2713 spin_lock_irqsave(&ihost->lock, flags);
2714 ihost->num_sessions--;
2715 if (ihost->num_sessions == 0)
2716 wake_up(&ihost->session_removal_wq);
2717 spin_unlock_irqrestore(&ihost->lock, flags);
2718 scsi_host_put(shost);
2722 * iscsi_session_setup - create iscsi cls session and host and session
2723 * @iscsit: iscsi transport template
2724 * @shost: scsi host
2725 * @cmds_max: session can queue
2726 * @dd_size: private driver data size, added to session allocation size
2727 * @cmd_task_size: LLD task private data size
2728 * @initial_cmdsn: initial CmdSN
2729 * @id: target ID to add to this session
2731 * This can be used by software iscsi_transports that allocate
2732 * a session per scsi host.
2734 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2735 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2736 * for nop handling and login/logout requests.
2738 struct iscsi_cls_session *
2739 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2740 uint16_t cmds_max, int dd_size, int cmd_task_size,
2741 uint32_t initial_cmdsn, unsigned int id)
2743 struct iscsi_host *ihost = shost_priv(shost);
2744 struct iscsi_session *session;
2745 struct iscsi_cls_session *cls_session;
2746 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2747 unsigned long flags;
2749 spin_lock_irqsave(&ihost->lock, flags);
2750 if (ihost->state == ISCSI_HOST_REMOVED) {
2751 spin_unlock_irqrestore(&ihost->lock, flags);
2752 return NULL;
2754 ihost->num_sessions++;
2755 spin_unlock_irqrestore(&ihost->lock, flags);
2757 if (!total_cmds)
2758 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2760 * The iscsi layer needs some tasks for nop handling and tmfs,
2761 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2762 * + 1 command for scsi IO.
2764 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2765 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2766 "must be a power of two that is at least %d.\n",
2767 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2768 goto dec_session_count;
2771 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2772 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2773 "must be a power of 2 less than or equal to %d.\n",
2774 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2775 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2778 if (!is_power_of_2(total_cmds)) {
2779 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2780 "must be a power of 2.\n", total_cmds);
2781 total_cmds = rounddown_pow_of_two(total_cmds);
2782 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2783 goto dec_session_count;
2784 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2785 total_cmds);
2787 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2789 cls_session = iscsi_alloc_session(shost, iscsit,
2790 sizeof(struct iscsi_session) +
2791 dd_size);
2792 if (!cls_session)
2793 goto dec_session_count;
2794 session = cls_session->dd_data;
2795 session->cls_session = cls_session;
2796 session->host = shost;
2797 session->state = ISCSI_STATE_FREE;
2798 session->fast_abort = 1;
2799 session->tgt_reset_timeout = 30;
2800 session->lu_reset_timeout = 15;
2801 session->abort_timeout = 10;
2802 session->scsi_cmds_max = scsi_cmds;
2803 session->cmds_max = total_cmds;
2804 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2805 session->exp_cmdsn = initial_cmdsn + 1;
2806 session->max_cmdsn = initial_cmdsn + 1;
2807 session->max_r2t = 1;
2808 session->tt = iscsit;
2809 session->dd_data = cls_session->dd_data + sizeof(*session);
2811 mutex_init(&session->eh_mutex);
2812 spin_lock_init(&session->frwd_lock);
2813 spin_lock_init(&session->back_lock);
2815 /* initialize SCSI PDU commands pool */
2816 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2817 (void***)&session->cmds,
2818 cmd_task_size + sizeof(struct iscsi_task)))
2819 goto cmdpool_alloc_fail;
2821 /* pre-format cmds pool with ITT */
2822 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2823 struct iscsi_task *task = session->cmds[cmd_i];
2825 if (cmd_task_size)
2826 task->dd_data = &task[1];
2827 task->itt = cmd_i;
2828 task->state = ISCSI_TASK_FREE;
2829 INIT_LIST_HEAD(&task->running);
2832 if (!try_module_get(iscsit->owner))
2833 goto module_get_fail;
2835 if (iscsi_add_session(cls_session, id))
2836 goto cls_session_fail;
2838 return cls_session;
2840 cls_session_fail:
2841 module_put(iscsit->owner);
2842 module_get_fail:
2843 iscsi_pool_free(&session->cmdpool);
2844 cmdpool_alloc_fail:
2845 iscsi_free_session(cls_session);
2846 dec_session_count:
2847 iscsi_host_dec_session_cnt(shost);
2848 return NULL;
2850 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2853 * iscsi_session_teardown - destroy session, host, and cls_session
2854 * @cls_session: iscsi session
2856 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2858 struct iscsi_session *session = cls_session->dd_data;
2859 struct module *owner = cls_session->transport->owner;
2860 struct Scsi_Host *shost = session->host;
2862 iscsi_pool_free(&session->cmdpool);
2864 iscsi_remove_session(cls_session);
2866 kfree(session->password);
2867 kfree(session->password_in);
2868 kfree(session->username);
2869 kfree(session->username_in);
2870 kfree(session->targetname);
2871 kfree(session->targetalias);
2872 kfree(session->initiatorname);
2873 kfree(session->boot_root);
2874 kfree(session->boot_nic);
2875 kfree(session->boot_target);
2876 kfree(session->ifacename);
2877 kfree(session->portal_type);
2878 kfree(session->discovery_parent_type);
2880 iscsi_free_session(cls_session);
2882 iscsi_host_dec_session_cnt(shost);
2883 module_put(owner);
2885 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2888 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2889 * @cls_session: iscsi_cls_session
2890 * @dd_size: private driver data size
2891 * @conn_idx: cid
2893 struct iscsi_cls_conn *
2894 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2895 uint32_t conn_idx)
2897 struct iscsi_session *session = cls_session->dd_data;
2898 struct iscsi_conn *conn;
2899 struct iscsi_cls_conn *cls_conn;
2900 char *data;
2902 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2903 conn_idx);
2904 if (!cls_conn)
2905 return NULL;
2906 conn = cls_conn->dd_data;
2907 memset(conn, 0, sizeof(*conn) + dd_size);
2909 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2910 conn->session = session;
2911 conn->cls_conn = cls_conn;
2912 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2913 conn->id = conn_idx;
2914 conn->exp_statsn = 0;
2915 conn->tmf_state = TMF_INITIAL;
2917 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
2919 INIT_LIST_HEAD(&conn->mgmtqueue);
2920 INIT_LIST_HEAD(&conn->cmdqueue);
2921 INIT_LIST_HEAD(&conn->requeue);
2922 spin_lock_init(&conn->taskqueuelock);
2923 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2925 /* allocate login_task used for the login/text sequences */
2926 spin_lock_bh(&session->frwd_lock);
2927 if (!kfifo_out(&session->cmdpool.queue,
2928 (void*)&conn->login_task,
2929 sizeof(void*))) {
2930 spin_unlock_bh(&session->frwd_lock);
2931 goto login_task_alloc_fail;
2933 spin_unlock_bh(&session->frwd_lock);
2935 data = (char *) __get_free_pages(GFP_KERNEL,
2936 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2937 if (!data)
2938 goto login_task_data_alloc_fail;
2939 conn->login_task->data = conn->data = data;
2941 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
2942 init_waitqueue_head(&conn->ehwait);
2944 return cls_conn;
2946 login_task_data_alloc_fail:
2947 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2948 sizeof(void*));
2949 login_task_alloc_fail:
2950 iscsi_destroy_conn(cls_conn);
2951 return NULL;
2953 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2956 * iscsi_conn_teardown - teardown iscsi connection
2957 * @cls_conn: iscsi class connection
2959 * TODO: we may need to make this into a two step process
2960 * like scsi-mls remove + put host
2962 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2964 struct iscsi_conn *conn = cls_conn->dd_data;
2965 struct iscsi_session *session = conn->session;
2967 del_timer_sync(&conn->transport_timer);
2969 mutex_lock(&session->eh_mutex);
2970 spin_lock_bh(&session->frwd_lock);
2971 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2972 if (session->leadconn == conn) {
2974 * leading connection? then give up on recovery.
2976 session->state = ISCSI_STATE_TERMINATE;
2977 wake_up(&conn->ehwait);
2979 spin_unlock_bh(&session->frwd_lock);
2981 /* flush queued up work because we free the connection below */
2982 iscsi_suspend_tx(conn);
2984 spin_lock_bh(&session->frwd_lock);
2985 free_pages((unsigned long) conn->data,
2986 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2987 kfree(conn->persistent_address);
2988 kfree(conn->local_ipaddr);
2989 /* regular RX path uses back_lock */
2990 spin_lock_bh(&session->back_lock);
2991 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2992 sizeof(void*));
2993 spin_unlock_bh(&session->back_lock);
2994 if (session->leadconn == conn)
2995 session->leadconn = NULL;
2996 spin_unlock_bh(&session->frwd_lock);
2997 mutex_unlock(&session->eh_mutex);
2999 iscsi_destroy_conn(cls_conn);
3001 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3003 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3005 struct iscsi_conn *conn = cls_conn->dd_data;
3006 struct iscsi_session *session = conn->session;
3008 if (!session) {
3009 iscsi_conn_printk(KERN_ERR, conn,
3010 "can't start unbound connection\n");
3011 return -EPERM;
3014 if ((session->imm_data_en || !session->initial_r2t_en) &&
3015 session->first_burst > session->max_burst) {
3016 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3017 "first_burst %d max_burst %d\n",
3018 session->first_burst, session->max_burst);
3019 return -EINVAL;
3022 if (conn->ping_timeout && !conn->recv_timeout) {
3023 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3024 "zero. Using 5 seconds\n.");
3025 conn->recv_timeout = 5;
3028 if (conn->recv_timeout && !conn->ping_timeout) {
3029 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3030 "zero. Using 5 seconds.\n");
3031 conn->ping_timeout = 5;
3034 spin_lock_bh(&session->frwd_lock);
3035 conn->c_stage = ISCSI_CONN_STARTED;
3036 session->state = ISCSI_STATE_LOGGED_IN;
3037 session->queued_cmdsn = session->cmdsn;
3039 conn->last_recv = jiffies;
3040 conn->last_ping = jiffies;
3041 if (conn->recv_timeout && conn->ping_timeout)
3042 mod_timer(&conn->transport_timer,
3043 jiffies + (conn->recv_timeout * HZ));
3045 switch(conn->stop_stage) {
3046 case STOP_CONN_RECOVER:
3048 * unblock eh_abort() if it is blocked. re-try all
3049 * commands after successful recovery
3051 conn->stop_stage = 0;
3052 conn->tmf_state = TMF_INITIAL;
3053 session->age++;
3054 if (session->age == 16)
3055 session->age = 0;
3056 break;
3057 case STOP_CONN_TERM:
3058 conn->stop_stage = 0;
3059 break;
3060 default:
3061 break;
3063 spin_unlock_bh(&session->frwd_lock);
3065 iscsi_unblock_session(session->cls_session);
3066 wake_up(&conn->ehwait);
3067 return 0;
3069 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3071 static void
3072 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3074 struct iscsi_task *task;
3075 int i, state;
3077 for (i = 0; i < conn->session->cmds_max; i++) {
3078 task = conn->session->cmds[i];
3079 if (task->sc)
3080 continue;
3082 if (task->state == ISCSI_TASK_FREE)
3083 continue;
3085 ISCSI_DBG_SESSION(conn->session,
3086 "failing mgmt itt 0x%x state %d\n",
3087 task->itt, task->state);
3088 state = ISCSI_TASK_ABRT_SESS_RECOV;
3089 if (task->state == ISCSI_TASK_PENDING)
3090 state = ISCSI_TASK_COMPLETED;
3091 spin_lock_bh(&session->back_lock);
3092 iscsi_complete_task(task, state);
3093 spin_unlock_bh(&session->back_lock);
3097 static void iscsi_start_session_recovery(struct iscsi_session *session,
3098 struct iscsi_conn *conn, int flag)
3100 int old_stop_stage;
3102 mutex_lock(&session->eh_mutex);
3103 spin_lock_bh(&session->frwd_lock);
3104 if (conn->stop_stage == STOP_CONN_TERM) {
3105 spin_unlock_bh(&session->frwd_lock);
3106 mutex_unlock(&session->eh_mutex);
3107 return;
3111 * When this is called for the in_login state, we only want to clean
3112 * up the login task and connection. We do not need to block and set
3113 * the recovery state again
3115 if (flag == STOP_CONN_TERM)
3116 session->state = ISCSI_STATE_TERMINATE;
3117 else if (conn->stop_stage != STOP_CONN_RECOVER)
3118 session->state = ISCSI_STATE_IN_RECOVERY;
3120 old_stop_stage = conn->stop_stage;
3121 conn->stop_stage = flag;
3122 spin_unlock_bh(&session->frwd_lock);
3124 del_timer_sync(&conn->transport_timer);
3125 iscsi_suspend_tx(conn);
3127 spin_lock_bh(&session->frwd_lock);
3128 conn->c_stage = ISCSI_CONN_STOPPED;
3129 spin_unlock_bh(&session->frwd_lock);
3132 * for connection level recovery we should not calculate
3133 * header digest. conn->hdr_size used for optimization
3134 * in hdr_extract() and will be re-negotiated at
3135 * set_param() time.
3137 if (flag == STOP_CONN_RECOVER) {
3138 conn->hdrdgst_en = 0;
3139 conn->datadgst_en = 0;
3140 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3141 old_stop_stage != STOP_CONN_RECOVER) {
3142 ISCSI_DBG_SESSION(session, "blocking session\n");
3143 iscsi_block_session(session->cls_session);
3148 * flush queues.
3150 spin_lock_bh(&session->frwd_lock);
3151 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3152 fail_mgmt_tasks(session, conn);
3153 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3154 spin_unlock_bh(&session->frwd_lock);
3155 mutex_unlock(&session->eh_mutex);
3158 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3160 struct iscsi_conn *conn = cls_conn->dd_data;
3161 struct iscsi_session *session = conn->session;
3163 switch (flag) {
3164 case STOP_CONN_RECOVER:
3165 cls_conn->state = ISCSI_CONN_FAILED;
3166 break;
3167 case STOP_CONN_TERM:
3168 cls_conn->state = ISCSI_CONN_DOWN;
3169 break;
3170 default:
3171 iscsi_conn_printk(KERN_ERR, conn,
3172 "invalid stop flag %d\n", flag);
3173 return;
3176 iscsi_start_session_recovery(session, conn, flag);
3178 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3180 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3181 struct iscsi_cls_conn *cls_conn, int is_leading)
3183 struct iscsi_session *session = cls_session->dd_data;
3184 struct iscsi_conn *conn = cls_conn->dd_data;
3186 spin_lock_bh(&session->frwd_lock);
3187 if (is_leading)
3188 session->leadconn = conn;
3189 spin_unlock_bh(&session->frwd_lock);
3192 * Unblock xmitworker(), Login Phase will pass through.
3194 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3195 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3196 return 0;
3198 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3200 int iscsi_switch_str_param(char **param, char *new_val_buf)
3202 char *new_val;
3204 if (*param) {
3205 if (!strcmp(*param, new_val_buf))
3206 return 0;
3209 new_val = kstrdup(new_val_buf, GFP_NOIO);
3210 if (!new_val)
3211 return -ENOMEM;
3213 kfree(*param);
3214 *param = new_val;
3215 return 0;
3217 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3219 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3220 enum iscsi_param param, char *buf, int buflen)
3222 struct iscsi_conn *conn = cls_conn->dd_data;
3223 struct iscsi_session *session = conn->session;
3224 int val;
3226 switch(param) {
3227 case ISCSI_PARAM_FAST_ABORT:
3228 sscanf(buf, "%d", &session->fast_abort);
3229 break;
3230 case ISCSI_PARAM_ABORT_TMO:
3231 sscanf(buf, "%d", &session->abort_timeout);
3232 break;
3233 case ISCSI_PARAM_LU_RESET_TMO:
3234 sscanf(buf, "%d", &session->lu_reset_timeout);
3235 break;
3236 case ISCSI_PARAM_TGT_RESET_TMO:
3237 sscanf(buf, "%d", &session->tgt_reset_timeout);
3238 break;
3239 case ISCSI_PARAM_PING_TMO:
3240 sscanf(buf, "%d", &conn->ping_timeout);
3241 break;
3242 case ISCSI_PARAM_RECV_TMO:
3243 sscanf(buf, "%d", &conn->recv_timeout);
3244 break;
3245 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3246 sscanf(buf, "%d", &conn->max_recv_dlength);
3247 break;
3248 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3249 sscanf(buf, "%d", &conn->max_xmit_dlength);
3250 break;
3251 case ISCSI_PARAM_HDRDGST_EN:
3252 sscanf(buf, "%d", &conn->hdrdgst_en);
3253 break;
3254 case ISCSI_PARAM_DATADGST_EN:
3255 sscanf(buf, "%d", &conn->datadgst_en);
3256 break;
3257 case ISCSI_PARAM_INITIAL_R2T_EN:
3258 sscanf(buf, "%d", &session->initial_r2t_en);
3259 break;
3260 case ISCSI_PARAM_MAX_R2T:
3261 sscanf(buf, "%hu", &session->max_r2t);
3262 break;
3263 case ISCSI_PARAM_IMM_DATA_EN:
3264 sscanf(buf, "%d", &session->imm_data_en);
3265 break;
3266 case ISCSI_PARAM_FIRST_BURST:
3267 sscanf(buf, "%d", &session->first_burst);
3268 break;
3269 case ISCSI_PARAM_MAX_BURST:
3270 sscanf(buf, "%d", &session->max_burst);
3271 break;
3272 case ISCSI_PARAM_PDU_INORDER_EN:
3273 sscanf(buf, "%d", &session->pdu_inorder_en);
3274 break;
3275 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3276 sscanf(buf, "%d", &session->dataseq_inorder_en);
3277 break;
3278 case ISCSI_PARAM_ERL:
3279 sscanf(buf, "%d", &session->erl);
3280 break;
3281 case ISCSI_PARAM_EXP_STATSN:
3282 sscanf(buf, "%u", &conn->exp_statsn);
3283 break;
3284 case ISCSI_PARAM_USERNAME:
3285 return iscsi_switch_str_param(&session->username, buf);
3286 case ISCSI_PARAM_USERNAME_IN:
3287 return iscsi_switch_str_param(&session->username_in, buf);
3288 case ISCSI_PARAM_PASSWORD:
3289 return iscsi_switch_str_param(&session->password, buf);
3290 case ISCSI_PARAM_PASSWORD_IN:
3291 return iscsi_switch_str_param(&session->password_in, buf);
3292 case ISCSI_PARAM_TARGET_NAME:
3293 return iscsi_switch_str_param(&session->targetname, buf);
3294 case ISCSI_PARAM_TARGET_ALIAS:
3295 return iscsi_switch_str_param(&session->targetalias, buf);
3296 case ISCSI_PARAM_TPGT:
3297 sscanf(buf, "%d", &session->tpgt);
3298 break;
3299 case ISCSI_PARAM_PERSISTENT_PORT:
3300 sscanf(buf, "%d", &conn->persistent_port);
3301 break;
3302 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3303 return iscsi_switch_str_param(&conn->persistent_address, buf);
3304 case ISCSI_PARAM_IFACE_NAME:
3305 return iscsi_switch_str_param(&session->ifacename, buf);
3306 case ISCSI_PARAM_INITIATOR_NAME:
3307 return iscsi_switch_str_param(&session->initiatorname, buf);
3308 case ISCSI_PARAM_BOOT_ROOT:
3309 return iscsi_switch_str_param(&session->boot_root, buf);
3310 case ISCSI_PARAM_BOOT_NIC:
3311 return iscsi_switch_str_param(&session->boot_nic, buf);
3312 case ISCSI_PARAM_BOOT_TARGET:
3313 return iscsi_switch_str_param(&session->boot_target, buf);
3314 case ISCSI_PARAM_PORTAL_TYPE:
3315 return iscsi_switch_str_param(&session->portal_type, buf);
3316 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3317 return iscsi_switch_str_param(&session->discovery_parent_type,
3318 buf);
3319 case ISCSI_PARAM_DISCOVERY_SESS:
3320 sscanf(buf, "%d", &val);
3321 session->discovery_sess = !!val;
3322 break;
3323 case ISCSI_PARAM_LOCAL_IPADDR:
3324 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3325 default:
3326 return -ENOSYS;
3329 return 0;
3331 EXPORT_SYMBOL_GPL(iscsi_set_param);
3333 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3334 enum iscsi_param param, char *buf)
3336 struct iscsi_session *session = cls_session->dd_data;
3337 int len;
3339 switch(param) {
3340 case ISCSI_PARAM_FAST_ABORT:
3341 len = sprintf(buf, "%d\n", session->fast_abort);
3342 break;
3343 case ISCSI_PARAM_ABORT_TMO:
3344 len = sprintf(buf, "%d\n", session->abort_timeout);
3345 break;
3346 case ISCSI_PARAM_LU_RESET_TMO:
3347 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3348 break;
3349 case ISCSI_PARAM_TGT_RESET_TMO:
3350 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3351 break;
3352 case ISCSI_PARAM_INITIAL_R2T_EN:
3353 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3354 break;
3355 case ISCSI_PARAM_MAX_R2T:
3356 len = sprintf(buf, "%hu\n", session->max_r2t);
3357 break;
3358 case ISCSI_PARAM_IMM_DATA_EN:
3359 len = sprintf(buf, "%d\n", session->imm_data_en);
3360 break;
3361 case ISCSI_PARAM_FIRST_BURST:
3362 len = sprintf(buf, "%u\n", session->first_burst);
3363 break;
3364 case ISCSI_PARAM_MAX_BURST:
3365 len = sprintf(buf, "%u\n", session->max_burst);
3366 break;
3367 case ISCSI_PARAM_PDU_INORDER_EN:
3368 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3369 break;
3370 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3371 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3372 break;
3373 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3374 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3375 break;
3376 case ISCSI_PARAM_ERL:
3377 len = sprintf(buf, "%d\n", session->erl);
3378 break;
3379 case ISCSI_PARAM_TARGET_NAME:
3380 len = sprintf(buf, "%s\n", session->targetname);
3381 break;
3382 case ISCSI_PARAM_TARGET_ALIAS:
3383 len = sprintf(buf, "%s\n", session->targetalias);
3384 break;
3385 case ISCSI_PARAM_TPGT:
3386 len = sprintf(buf, "%d\n", session->tpgt);
3387 break;
3388 case ISCSI_PARAM_USERNAME:
3389 len = sprintf(buf, "%s\n", session->username);
3390 break;
3391 case ISCSI_PARAM_USERNAME_IN:
3392 len = sprintf(buf, "%s\n", session->username_in);
3393 break;
3394 case ISCSI_PARAM_PASSWORD:
3395 len = sprintf(buf, "%s\n", session->password);
3396 break;
3397 case ISCSI_PARAM_PASSWORD_IN:
3398 len = sprintf(buf, "%s\n", session->password_in);
3399 break;
3400 case ISCSI_PARAM_IFACE_NAME:
3401 len = sprintf(buf, "%s\n", session->ifacename);
3402 break;
3403 case ISCSI_PARAM_INITIATOR_NAME:
3404 len = sprintf(buf, "%s\n", session->initiatorname);
3405 break;
3406 case ISCSI_PARAM_BOOT_ROOT:
3407 len = sprintf(buf, "%s\n", session->boot_root);
3408 break;
3409 case ISCSI_PARAM_BOOT_NIC:
3410 len = sprintf(buf, "%s\n", session->boot_nic);
3411 break;
3412 case ISCSI_PARAM_BOOT_TARGET:
3413 len = sprintf(buf, "%s\n", session->boot_target);
3414 break;
3415 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3416 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3417 break;
3418 case ISCSI_PARAM_DISCOVERY_SESS:
3419 len = sprintf(buf, "%u\n", session->discovery_sess);
3420 break;
3421 case ISCSI_PARAM_PORTAL_TYPE:
3422 len = sprintf(buf, "%s\n", session->portal_type);
3423 break;
3424 case ISCSI_PARAM_CHAP_AUTH_EN:
3425 len = sprintf(buf, "%u\n", session->chap_auth_en);
3426 break;
3427 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3428 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3429 break;
3430 case ISCSI_PARAM_BIDI_CHAP_EN:
3431 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3432 break;
3433 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3434 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3435 break;
3436 case ISCSI_PARAM_DEF_TIME2WAIT:
3437 len = sprintf(buf, "%d\n", session->time2wait);
3438 break;
3439 case ISCSI_PARAM_DEF_TIME2RETAIN:
3440 len = sprintf(buf, "%d\n", session->time2retain);
3441 break;
3442 case ISCSI_PARAM_TSID:
3443 len = sprintf(buf, "%u\n", session->tsid);
3444 break;
3445 case ISCSI_PARAM_ISID:
3446 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3447 session->isid[0], session->isid[1],
3448 session->isid[2], session->isid[3],
3449 session->isid[4], session->isid[5]);
3450 break;
3451 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3452 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3453 break;
3454 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3455 if (session->discovery_parent_type)
3456 len = sprintf(buf, "%s\n",
3457 session->discovery_parent_type);
3458 else
3459 len = sprintf(buf, "\n");
3460 break;
3461 default:
3462 return -ENOSYS;
3465 return len;
3467 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3469 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3470 enum iscsi_param param, char *buf)
3472 struct sockaddr_in6 *sin6 = NULL;
3473 struct sockaddr_in *sin = NULL;
3474 int len;
3476 switch (addr->ss_family) {
3477 case AF_INET:
3478 sin = (struct sockaddr_in *)addr;
3479 break;
3480 case AF_INET6:
3481 sin6 = (struct sockaddr_in6 *)addr;
3482 break;
3483 default:
3484 return -EINVAL;
3487 switch (param) {
3488 case ISCSI_PARAM_CONN_ADDRESS:
3489 case ISCSI_HOST_PARAM_IPADDRESS:
3490 if (sin)
3491 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3492 else
3493 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3494 break;
3495 case ISCSI_PARAM_CONN_PORT:
3496 case ISCSI_PARAM_LOCAL_PORT:
3497 if (sin)
3498 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3499 else
3500 len = sprintf(buf, "%hu\n",
3501 be16_to_cpu(sin6->sin6_port));
3502 break;
3503 default:
3504 return -EINVAL;
3507 return len;
3509 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3511 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3512 enum iscsi_param param, char *buf)
3514 struct iscsi_conn *conn = cls_conn->dd_data;
3515 int len;
3517 switch(param) {
3518 case ISCSI_PARAM_PING_TMO:
3519 len = sprintf(buf, "%u\n", conn->ping_timeout);
3520 break;
3521 case ISCSI_PARAM_RECV_TMO:
3522 len = sprintf(buf, "%u\n", conn->recv_timeout);
3523 break;
3524 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3525 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3526 break;
3527 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3528 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3529 break;
3530 case ISCSI_PARAM_HDRDGST_EN:
3531 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3532 break;
3533 case ISCSI_PARAM_DATADGST_EN:
3534 len = sprintf(buf, "%d\n", conn->datadgst_en);
3535 break;
3536 case ISCSI_PARAM_IFMARKER_EN:
3537 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3538 break;
3539 case ISCSI_PARAM_OFMARKER_EN:
3540 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3541 break;
3542 case ISCSI_PARAM_EXP_STATSN:
3543 len = sprintf(buf, "%u\n", conn->exp_statsn);
3544 break;
3545 case ISCSI_PARAM_PERSISTENT_PORT:
3546 len = sprintf(buf, "%d\n", conn->persistent_port);
3547 break;
3548 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3549 len = sprintf(buf, "%s\n", conn->persistent_address);
3550 break;
3551 case ISCSI_PARAM_STATSN:
3552 len = sprintf(buf, "%u\n", conn->statsn);
3553 break;
3554 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3555 len = sprintf(buf, "%u\n", conn->max_segment_size);
3556 break;
3557 case ISCSI_PARAM_KEEPALIVE_TMO:
3558 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3559 break;
3560 case ISCSI_PARAM_LOCAL_PORT:
3561 len = sprintf(buf, "%u\n", conn->local_port);
3562 break;
3563 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3564 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3565 break;
3566 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3567 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3568 break;
3569 case ISCSI_PARAM_TCP_WSF_DISABLE:
3570 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3571 break;
3572 case ISCSI_PARAM_TCP_TIMER_SCALE:
3573 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3574 break;
3575 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3576 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3577 break;
3578 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3579 len = sprintf(buf, "%u\n", conn->fragment_disable);
3580 break;
3581 case ISCSI_PARAM_IPV4_TOS:
3582 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3583 break;
3584 case ISCSI_PARAM_IPV6_TC:
3585 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3586 break;
3587 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3588 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3589 break;
3590 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3591 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3592 break;
3593 case ISCSI_PARAM_TCP_XMIT_WSF:
3594 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3595 break;
3596 case ISCSI_PARAM_TCP_RECV_WSF:
3597 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3598 break;
3599 case ISCSI_PARAM_LOCAL_IPADDR:
3600 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3601 break;
3602 default:
3603 return -ENOSYS;
3606 return len;
3608 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3610 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3611 char *buf)
3613 struct iscsi_host *ihost = shost_priv(shost);
3614 int len;
3616 switch (param) {
3617 case ISCSI_HOST_PARAM_NETDEV_NAME:
3618 len = sprintf(buf, "%s\n", ihost->netdev);
3619 break;
3620 case ISCSI_HOST_PARAM_HWADDRESS:
3621 len = sprintf(buf, "%s\n", ihost->hwaddress);
3622 break;
3623 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3624 len = sprintf(buf, "%s\n", ihost->initiatorname);
3625 break;
3626 default:
3627 return -ENOSYS;
3630 return len;
3632 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3634 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3635 char *buf, int buflen)
3637 struct iscsi_host *ihost = shost_priv(shost);
3639 switch (param) {
3640 case ISCSI_HOST_PARAM_NETDEV_NAME:
3641 return iscsi_switch_str_param(&ihost->netdev, buf);
3642 case ISCSI_HOST_PARAM_HWADDRESS:
3643 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3644 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3645 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3646 default:
3647 return -ENOSYS;
3650 return 0;
3652 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3654 MODULE_AUTHOR("Mike Christie");
3655 MODULE_DESCRIPTION("iSCSI library functions");
3656 MODULE_LICENSE("GPL");