4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
41 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
42 #define SNA32_CHECK 2147483648UL
44 static int iscsi_sna_lt(u32 n1, u32 n2)
46 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
47 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
50 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
51 static int iscsi_sna_lte(u32 n1, u32 n2)
53 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
58 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
60 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
61 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
64 * standard specifies this check for when to update expected and
65 * max sequence numbers
67 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
70 if (exp_cmdsn != session->exp_cmdsn &&
71 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
72 session->exp_cmdsn = exp_cmdsn;
74 if (max_cmdsn != session->max_cmdsn &&
75 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
76 session->max_cmdsn = max_cmdsn;
78 * if the window closed with IO queued, then kick the
81 if (!list_empty(&session->leadconn->xmitqueue) ||
82 !list_empty(&session->leadconn->mgmtqueue)) {
83 if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD))
84 scsi_queue_work(session->host,
85 &session->leadconn->xmitwork);
89 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
91 void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *task,
92 struct iscsi_data *hdr)
94 struct iscsi_conn *conn = task->conn;
96 memset(hdr, 0, sizeof(struct iscsi_data));
97 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
98 hdr->datasn = cpu_to_be32(task->unsol_datasn);
100 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
101 memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
103 hdr->itt = task->hdr->itt;
104 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
105 hdr->offset = cpu_to_be32(task->unsol_offset);
107 if (task->unsol_count > conn->max_xmit_dlength) {
108 hton24(hdr->dlength, conn->max_xmit_dlength);
109 task->data_count = conn->max_xmit_dlength;
110 task->unsol_offset += task->data_count;
113 hton24(hdr->dlength, task->unsol_count);
114 task->data_count = task->unsol_count;
115 hdr->flags = ISCSI_FLAG_CMD_FINAL;
118 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
120 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
122 unsigned exp_len = task->hdr_len + len;
124 if (exp_len > task->hdr_max) {
129 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
130 task->hdr_len = exp_len;
135 * make an extended cdb AHS
137 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
139 struct scsi_cmnd *cmd = task->sc;
140 unsigned rlen, pad_len;
141 unsigned short ahslength;
142 struct iscsi_ecdb_ahdr *ecdb_ahdr;
145 ecdb_ahdr = iscsi_next_hdr(task);
146 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
148 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
149 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
151 pad_len = iscsi_padding(rlen);
153 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
154 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
159 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
161 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
162 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
163 ecdb_ahdr->reserved = 0;
164 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
166 debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
167 "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
168 cmd->cmd_len, rlen, pad_len, ahslength, task->hdr_len);
173 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
175 struct scsi_cmnd *sc = task->sc;
176 struct iscsi_rlength_ahdr *rlen_ahdr;
179 rlen_ahdr = iscsi_next_hdr(task);
180 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
184 rlen_ahdr->ahslength =
185 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
186 sizeof(rlen_ahdr->reserved));
187 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
188 rlen_ahdr->reserved = 0;
189 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
191 debug_scsi("bidi-in rlen_ahdr->read_length(%d) "
192 "rlen_ahdr->ahslength(%d)\n",
193 be32_to_cpu(rlen_ahdr->read_length),
194 be16_to_cpu(rlen_ahdr->ahslength));
199 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
202 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
203 * fields like dlength or final based on how much data it sends
205 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
207 struct iscsi_conn *conn = task->conn;
208 struct iscsi_session *session = conn->session;
209 struct iscsi_cmd *hdr = task->hdr;
210 struct scsi_cmnd *sc = task->sc;
211 unsigned hdrlength, cmd_len;
215 rc = iscsi_add_hdr(task, sizeof(*hdr));
218 hdr->opcode = ISCSI_OP_SCSI_CMD;
219 hdr->flags = ISCSI_ATTR_SIMPLE;
220 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
221 hdr->itt = build_itt(task->itt, session->age);
222 hdr->cmdsn = cpu_to_be32(session->cmdsn);
224 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
225 cmd_len = sc->cmd_len;
226 if (cmd_len < ISCSI_CDB_SIZE)
227 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
228 else if (cmd_len > ISCSI_CDB_SIZE) {
229 rc = iscsi_prep_ecdb_ahs(task);
232 cmd_len = ISCSI_CDB_SIZE;
234 memcpy(hdr->cdb, sc->cmnd, cmd_len);
237 if (scsi_bidi_cmnd(sc)) {
238 hdr->flags |= ISCSI_FLAG_CMD_READ;
239 rc = iscsi_prep_bidi_ahs(task);
243 if (sc->sc_data_direction == DMA_TO_DEVICE) {
244 unsigned out_len = scsi_out(sc)->length;
245 hdr->data_length = cpu_to_be32(out_len);
246 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
250 * imm_count bytes to be sent right after
253 * unsol_count bytes(as Data-Out) to be sent
254 * without R2T ack right after
257 * r2t_data_count bytes to be sent via R2T ack's
259 * pad_count bytes to be sent as zero-padding
261 task->unsol_count = 0;
262 task->unsol_offset = 0;
263 task->unsol_datasn = 0;
265 if (session->imm_data_en) {
266 if (out_len >= session->first_burst)
267 task->imm_count = min(session->first_burst,
268 conn->max_xmit_dlength);
270 task->imm_count = min(out_len,
271 conn->max_xmit_dlength);
272 hton24(hdr->dlength, task->imm_count);
274 zero_data(hdr->dlength);
276 if (!session->initial_r2t_en) {
277 task->unsol_count = min(session->first_burst, out_len)
279 task->unsol_offset = task->imm_count;
282 if (!task->unsol_count)
283 /* No unsolicit Data-Out's */
284 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
286 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
287 zero_data(hdr->dlength);
288 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
290 if (sc->sc_data_direction == DMA_FROM_DEVICE)
291 hdr->flags |= ISCSI_FLAG_CMD_READ;
294 /* calculate size of additional header segments (AHSs) */
295 hdrlength = task->hdr_len - sizeof(*hdr);
297 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
298 hdrlength /= ISCSI_PAD_LEN;
300 WARN_ON(hdrlength >= 256);
301 hdr->hlength = hdrlength & 0xFF;
303 if (conn->session->tt->init_task &&
304 conn->session->tt->init_task(task))
307 task->state = ISCSI_TASK_RUNNING;
308 list_move_tail(&task->running, &conn->run_list);
310 conn->scsicmd_pdus_cnt++;
311 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
312 "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc) ?
313 "bidirectional" : sc->sc_data_direction == DMA_TO_DEVICE ?
314 "write" : "read", conn->id, sc, sc->cmnd[0], task->itt,
316 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
317 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
322 * iscsi_complete_command - finish a task
323 * @task: iscsi cmd task
325 * Must be called with session lock.
326 * This function returns the scsi command to scsi-ml or cleans
327 * up mgmt tasks then returns the task to the pool.
329 static void iscsi_complete_command(struct iscsi_task *task)
331 struct iscsi_conn *conn = task->conn;
332 struct iscsi_session *session = conn->session;
333 struct scsi_cmnd *sc = task->sc;
335 list_del_init(&task->running);
336 task->state = ISCSI_TASK_COMPLETED;
339 if (conn->task == task)
342 * login task is preallocated so do not free
344 if (conn->login_task == task)
347 __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
349 if (conn->ping_task == task)
350 conn->ping_task = NULL;
354 /* SCSI eh reuses commands to verify us */
357 * queue command may call this to free the task, but
358 * not have setup the sc callback
365 static void __iscsi_get_task(struct iscsi_task *task)
367 atomic_inc(&task->refcount);
370 static void __iscsi_put_task(struct iscsi_task *task)
372 if (atomic_dec_and_test(&task->refcount))
373 iscsi_complete_command(task);
376 void iscsi_put_task(struct iscsi_task *task)
378 struct iscsi_session *session = task->conn->session;
380 spin_lock_bh(&session->lock);
381 __iscsi_put_task(task);
382 spin_unlock_bh(&session->lock);
384 EXPORT_SYMBOL_GPL(iscsi_put_task);
387 * session lock must be held
389 static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
392 struct scsi_cmnd *sc;
398 if (task->state == ISCSI_TASK_PENDING)
400 * cmd never made it to the xmit thread, so we should not count
401 * the cmd in the sequencing
403 conn->session->queued_cmdsn--;
405 conn->session->tt->cleanup_task(conn, task);
409 if (!scsi_bidi_cmnd(sc))
410 scsi_set_resid(sc, scsi_bufflen(sc));
412 scsi_out(sc)->resid = scsi_out(sc)->length;
413 scsi_in(sc)->resid = scsi_in(sc)->length;
416 if (conn->task == task)
418 /* release ref from queuecommand */
419 __iscsi_put_task(task);
422 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
423 struct iscsi_task *task)
425 struct iscsi_session *session = conn->session;
426 struct iscsi_hdr *hdr = (struct iscsi_hdr *)task->hdr;
427 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
429 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
432 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
433 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
434 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
436 * pre-format CmdSN for outgoing PDU.
438 nop->cmdsn = cpu_to_be32(session->cmdsn);
439 if (hdr->itt != RESERVED_ITT) {
440 hdr->itt = build_itt(task->itt, session->age);
442 * TODO: We always use immediate, so we never hit this.
443 * If we start to send tmfs or nops as non-immediate then
444 * we should start checking the cmdsn numbers for mgmt tasks.
446 if (conn->c_stage == ISCSI_CONN_STARTED &&
447 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
448 session->queued_cmdsn++;
453 if (session->tt->init_task)
454 session->tt->init_task(task);
456 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
457 session->state = ISCSI_STATE_LOGGING_OUT;
459 list_move_tail(&task->running, &conn->mgmt_run_list);
460 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
461 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
466 static struct iscsi_task *
467 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
468 char *data, uint32_t data_size)
470 struct iscsi_session *session = conn->session;
471 struct iscsi_task *task;
473 if (session->state == ISCSI_STATE_TERMINATE)
476 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
477 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
479 * Login and Text are sent serially, in
480 * request-followed-by-response sequence.
481 * Same task can be used. Same ITT must be used.
482 * Note that login_task is preallocated at conn_create().
484 task = conn->login_task;
486 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
487 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
489 if (!__kfifo_get(session->cmdpool.queue,
490 (void*)&task, sizeof(void*)))
493 if ((hdr->opcode == (ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE)) &&
494 hdr->ttt == RESERVED_ITT) {
495 conn->ping_task = task;
496 conn->last_ping = jiffies;
500 * released in complete pdu for task we expect a response for, and
501 * released by the lld when it has transmitted the task for
502 * pdus we do not expect a response for.
504 atomic_set(&task->refcount, 1);
509 memcpy(task->data, data, data_size);
510 task->data_count = data_size;
512 task->data_count = 0;
514 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
515 INIT_LIST_HEAD(&task->running);
516 list_add_tail(&task->running, &conn->mgmtqueue);
518 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
519 if (iscsi_prep_mgmt_task(conn, task)) {
520 __iscsi_put_task(task);
524 if (session->tt->xmit_task(task))
528 scsi_queue_work(conn->session->host, &conn->xmitwork);
533 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
534 char *data, uint32_t data_size)
536 struct iscsi_conn *conn = cls_conn->dd_data;
537 struct iscsi_session *session = conn->session;
540 spin_lock_bh(&session->lock);
541 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
543 spin_unlock_bh(&session->lock);
546 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
549 * iscsi_cmd_rsp - SCSI Command Response processing
550 * @conn: iscsi connection
552 * @task: scsi command task
553 * @data: cmd data buffer
554 * @datalen: len of buffer
556 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
557 * then completes the command and task.
559 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
560 struct iscsi_task *task, char *data,
563 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
564 struct iscsi_session *session = conn->session;
565 struct scsi_cmnd *sc = task->sc;
567 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
568 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
570 sc->result = (DID_OK << 16) | rhdr->cmd_status;
572 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
573 sc->result = DID_ERROR << 16;
577 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
582 iscsi_conn_printk(KERN_ERR, conn,
583 "Got CHECK_CONDITION but invalid data "
584 "buffer size of %d\n", datalen);
585 sc->result = DID_BAD_TARGET << 16;
589 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
590 if (datalen < senselen)
591 goto invalid_datalen;
593 memcpy(sc->sense_buffer, data + 2,
594 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
595 debug_scsi("copied %d bytes of sense\n",
596 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
599 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
600 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
601 int res_count = be32_to_cpu(rhdr->bi_residual_count);
603 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
604 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
605 res_count <= scsi_in(sc)->length))
606 scsi_in(sc)->resid = res_count;
608 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
611 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
612 ISCSI_FLAG_CMD_OVERFLOW)) {
613 int res_count = be32_to_cpu(rhdr->residual_count);
616 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
617 res_count <= scsi_bufflen(sc)))
618 /* write side for bidi or uni-io set_resid */
619 scsi_set_resid(sc, res_count);
621 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
624 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
625 (long)sc, sc->result, task->itt);
626 conn->scsirsp_pdus_cnt++;
628 __iscsi_put_task(task);
631 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
633 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
635 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
636 conn->tmfrsp_pdus_cnt++;
638 if (conn->tmf_state != TMF_QUEUED)
641 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
642 conn->tmf_state = TMF_SUCCESS;
643 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
644 conn->tmf_state = TMF_NOT_FOUND;
646 conn->tmf_state = TMF_FAILED;
647 wake_up(&conn->ehwait);
650 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
652 struct iscsi_nopout hdr;
653 struct iscsi_task *task;
655 if (!rhdr && conn->ping_task)
658 memset(&hdr, 0, sizeof(struct iscsi_nopout));
659 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
660 hdr.flags = ISCSI_FLAG_CMD_FINAL;
663 memcpy(hdr.lun, rhdr->lun, 8);
665 hdr.itt = RESERVED_ITT;
667 hdr.ttt = RESERVED_ITT;
669 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
671 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
674 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
675 char *data, int datalen)
677 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
678 struct iscsi_hdr rejected_pdu;
681 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
683 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
684 if (ntoh24(reject->dlength) > datalen)
685 return ISCSI_ERR_PROTO;
687 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
688 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
689 itt = get_itt(rejected_pdu.itt);
690 iscsi_conn_printk(KERN_ERR, conn,
691 "itt 0x%x had pdu (op 0x%x) rejected "
692 "due to DataDigest error.\n", itt,
693 rejected_pdu.opcode);
700 * __iscsi_complete_pdu - complete pdu
704 * @datalen: len of data buffer
706 * Completes pdu processing by freeing any resources allocated at
707 * queuecommand or send generic. session lock must be held and verify
708 * itt must have been called.
710 static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
711 char *data, int datalen)
713 struct iscsi_session *session = conn->session;
714 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
715 struct iscsi_task *task;
718 conn->last_recv = jiffies;
719 rc = iscsi_verify_itt(conn, hdr->itt);
723 if (hdr->itt != RESERVED_ITT)
724 itt = get_itt(hdr->itt);
728 debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
729 opcode, conn->id, itt, datalen);
732 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
735 case ISCSI_OP_NOOP_IN:
737 rc = ISCSI_ERR_PROTO;
741 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
744 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
746 case ISCSI_OP_REJECT:
747 rc = iscsi_handle_reject(conn, hdr, data, datalen);
749 case ISCSI_OP_ASYNC_EVENT:
750 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
751 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
752 rc = ISCSI_ERR_CONN_FAILED;
755 rc = ISCSI_ERR_BAD_OPCODE;
761 task = session->cmds[itt];
763 case ISCSI_OP_SCSI_CMD_RSP:
765 rc = ISCSI_ERR_NO_SCSI_CMD;
768 BUG_ON((void*)task != task->sc->SCp.ptr);
769 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
771 case ISCSI_OP_SCSI_DATA_IN:
773 rc = ISCSI_ERR_NO_SCSI_CMD;
776 BUG_ON((void*)task != task->sc->SCp.ptr);
777 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
778 conn->scsirsp_pdus_cnt++;
779 iscsi_update_cmdsn(session,
780 (struct iscsi_nopin*) hdr);
781 __iscsi_put_task(task);
785 /* LLD handles this for now */
787 case ISCSI_OP_LOGOUT_RSP:
788 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
790 rc = ISCSI_ERR_PROTO;
793 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
795 case ISCSI_OP_LOGIN_RSP:
796 case ISCSI_OP_TEXT_RSP:
797 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
799 * login related PDU's exp_statsn is handled in
803 case ISCSI_OP_SCSI_TMFUNC_RSP:
804 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
806 rc = ISCSI_ERR_PROTO;
810 iscsi_tmf_rsp(conn, hdr);
811 __iscsi_put_task(task);
813 case ISCSI_OP_NOOP_IN:
814 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
815 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
816 rc = ISCSI_ERR_PROTO;
819 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
821 if (conn->ping_task != task)
823 * If this is not in response to one of our
824 * nops then it must be from userspace.
828 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
829 __iscsi_put_task(task);
832 rc = ISCSI_ERR_BAD_OPCODE;
839 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
840 rc = ISCSI_ERR_CONN_FAILED;
841 __iscsi_put_task(task);
845 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
846 char *data, int datalen)
850 spin_lock(&conn->session->lock);
851 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
852 spin_unlock(&conn->session->lock);
855 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
857 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
859 struct iscsi_session *session = conn->session;
860 struct iscsi_task *task;
863 if (itt == RESERVED_ITT)
866 if (((__force u32)itt & ISCSI_AGE_MASK) !=
867 (session->age << ISCSI_AGE_SHIFT)) {
868 iscsi_conn_printk(KERN_ERR, conn,
869 "received itt %x expected session age (%x)\n",
871 session->age & ISCSI_AGE_MASK);
872 return ISCSI_ERR_BAD_ITT;
876 if (i >= session->cmds_max) {
877 iscsi_conn_printk(KERN_ERR, conn,
878 "received invalid itt index %u (max cmds "
879 "%u.\n", i, session->cmds_max);
880 return ISCSI_ERR_BAD_ITT;
883 task = session->cmds[i];
884 if (task->sc && task->sc->SCp.phase != session->age) {
885 iscsi_conn_printk(KERN_ERR, conn,
886 "iscsi: task's session age %d, "
887 "expected %d\n", task->sc->SCp.phase,
889 return ISCSI_ERR_SESSION_FAILED;
893 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
896 iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
898 struct iscsi_session *session = conn->session;
899 struct iscsi_task *task;
902 if (iscsi_verify_itt(conn, itt))
905 if (itt == RESERVED_ITT)
909 if (i >= session->cmds_max)
912 task = session->cmds[i];
916 if (task->sc->SCp.phase != session->age)
921 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
923 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
925 struct iscsi_session *session = conn->session;
928 spin_lock_irqsave(&session->lock, flags);
929 if (session->state == ISCSI_STATE_FAILED) {
930 spin_unlock_irqrestore(&session->lock, flags);
934 if (conn->stop_stage == 0)
935 session->state = ISCSI_STATE_FAILED;
936 spin_unlock_irqrestore(&session->lock, flags);
937 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
938 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
939 iscsi_conn_error(conn->cls_conn, err);
941 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
943 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
945 struct iscsi_session *session = conn->session;
948 * Check for iSCSI window and take care of CmdSN wrap-around
950 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
951 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
952 "CmdSN %u/%u\n", session->exp_cmdsn,
953 session->max_cmdsn, session->cmdsn,
954 session->queued_cmdsn);
960 static int iscsi_xmit_task(struct iscsi_conn *conn)
962 struct iscsi_task *task = conn->task;
965 __iscsi_get_task(task);
966 spin_unlock_bh(&conn->session->lock);
967 rc = conn->session->tt->xmit_task(task);
968 spin_lock_bh(&conn->session->lock);
969 __iscsi_put_task(task);
971 /* done with this task */
977 * iscsi_requeue_task - requeue task to run from session workqueue
978 * @task: task to requeue
980 * LLDs that need to run a task from the session workqueue should call
981 * this. The session lock must be held. This should only be called
982 * by software drivers.
984 void iscsi_requeue_task(struct iscsi_task *task)
986 struct iscsi_conn *conn = task->conn;
988 list_move_tail(&task->running, &conn->requeue);
989 scsi_queue_work(conn->session->host, &conn->xmitwork);
991 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
994 * iscsi_data_xmit - xmit any command into the scheduled connection
995 * @conn: iscsi connection
998 * The function can return -EAGAIN in which case the caller must
999 * re-schedule it again later or recover. '0' return code means
1002 static int iscsi_data_xmit(struct iscsi_conn *conn)
1006 spin_lock_bh(&conn->session->lock);
1007 if (unlikely(conn->suspend_tx)) {
1008 debug_scsi("conn %d Tx suspended!\n", conn->id);
1009 spin_unlock_bh(&conn->session->lock);
1014 rc = iscsi_xmit_task(conn);
1020 * process mgmt pdus like nops before commands since we should
1021 * only have one nop-out as a ping from us and targets should not
1022 * overflow us with nop-ins
1025 while (!list_empty(&conn->mgmtqueue)) {
1026 conn->task = list_entry(conn->mgmtqueue.next,
1027 struct iscsi_task, running);
1028 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1029 __iscsi_put_task(conn->task);
1033 rc = iscsi_xmit_task(conn);
1038 /* process pending command queue */
1039 while (!list_empty(&conn->xmitqueue)) {
1040 if (conn->tmf_state == TMF_QUEUED)
1043 conn->task = list_entry(conn->xmitqueue.next,
1044 struct iscsi_task, running);
1045 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1046 fail_command(conn, conn->task, DID_IMM_RETRY << 16);
1049 if (iscsi_prep_scsi_cmd_pdu(conn->task)) {
1050 fail_command(conn, conn->task, DID_ABORT << 16);
1053 rc = iscsi_xmit_task(conn);
1057 * we could continuously get new task requests so
1058 * we need to check the mgmt queue for nops that need to
1059 * be sent to aviod starvation
1061 if (!list_empty(&conn->mgmtqueue))
1065 while (!list_empty(&conn->requeue)) {
1066 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1070 * we always do fastlogout - conn stop code will clean up.
1072 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1075 conn->task = list_entry(conn->requeue.next,
1076 struct iscsi_task, running);
1077 conn->task->state = ISCSI_TASK_RUNNING;
1078 list_move_tail(conn->requeue.next, &conn->run_list);
1079 rc = iscsi_xmit_task(conn);
1082 if (!list_empty(&conn->mgmtqueue))
1085 spin_unlock_bh(&conn->session->lock);
1089 if (unlikely(conn->suspend_tx))
1091 spin_unlock_bh(&conn->session->lock);
1095 static void iscsi_xmitworker(struct work_struct *work)
1097 struct iscsi_conn *conn =
1098 container_of(work, struct iscsi_conn, xmitwork);
1101 * serialize Xmit worker on a per-connection basis.
1104 rc = iscsi_data_xmit(conn);
1105 } while (rc >= 0 || rc == -EAGAIN);
1109 FAILURE_BAD_HOST = 1,
1110 FAILURE_SESSION_FAILED,
1111 FAILURE_SESSION_FREED,
1112 FAILURE_WINDOW_CLOSED,
1114 FAILURE_SESSION_TERMINATE,
1115 FAILURE_SESSION_IN_RECOVERY,
1116 FAILURE_SESSION_RECOVERY_TIMEOUT,
1117 FAILURE_SESSION_LOGGING_OUT,
1118 FAILURE_SESSION_NOT_READY,
1121 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1123 struct iscsi_cls_session *cls_session;
1124 struct Scsi_Host *host;
1126 struct iscsi_session *session;
1127 struct iscsi_conn *conn;
1128 struct iscsi_task *task = NULL;
1130 sc->scsi_done = done;
1134 host = sc->device->host;
1135 spin_unlock(host->host_lock);
1137 cls_session = starget_to_session(scsi_target(sc->device));
1138 session = cls_session->dd_data;
1139 spin_lock(&session->lock);
1141 reason = iscsi_session_chkready(cls_session);
1143 sc->result = reason;
1148 * ISCSI_STATE_FAILED is a temp. state. The recovery
1149 * code will decide what is best to do with command queued
1152 if (session->state != ISCSI_STATE_LOGGED_IN &&
1153 session->state != ISCSI_STATE_FAILED) {
1155 * to handle the race between when we set the recovery state
1156 * and block the session we requeue here (commands could
1157 * be entering our queuecommand while a block is starting
1158 * up because the block code is not locked)
1160 switch (session->state) {
1161 case ISCSI_STATE_IN_RECOVERY:
1162 reason = FAILURE_SESSION_IN_RECOVERY;
1163 sc->result = DID_IMM_RETRY << 16;
1165 case ISCSI_STATE_LOGGING_OUT:
1166 reason = FAILURE_SESSION_LOGGING_OUT;
1167 sc->result = DID_IMM_RETRY << 16;
1169 case ISCSI_STATE_RECOVERY_FAILED:
1170 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1171 sc->result = DID_NO_CONNECT << 16;
1173 case ISCSI_STATE_TERMINATE:
1174 reason = FAILURE_SESSION_TERMINATE;
1175 sc->result = DID_NO_CONNECT << 16;
1178 reason = FAILURE_SESSION_FREED;
1179 sc->result = DID_NO_CONNECT << 16;
1184 conn = session->leadconn;
1186 reason = FAILURE_SESSION_FREED;
1187 sc->result = DID_NO_CONNECT << 16;
1191 if (iscsi_check_cmdsn_window_closed(conn)) {
1192 reason = FAILURE_WINDOW_CLOSED;
1196 if (!__kfifo_get(session->cmdpool.queue, (void*)&task,
1198 reason = FAILURE_OOM;
1201 sc->SCp.phase = session->age;
1202 sc->SCp.ptr = (char *)task;
1204 atomic_set(&task->refcount, 1);
1205 task->state = ISCSI_TASK_PENDING;
1208 INIT_LIST_HEAD(&task->running);
1209 list_add_tail(&task->running, &conn->xmitqueue);
1211 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
1212 if (iscsi_prep_scsi_cmd_pdu(task)) {
1213 sc->result = DID_ABORT << 16;
1214 sc->scsi_done = NULL;
1215 iscsi_complete_command(task);
1218 if (session->tt->xmit_task(task)) {
1219 sc->scsi_done = NULL;
1220 iscsi_complete_command(task);
1221 reason = FAILURE_SESSION_NOT_READY;
1225 scsi_queue_work(session->host, &conn->xmitwork);
1227 session->queued_cmdsn++;
1228 spin_unlock(&session->lock);
1229 spin_lock(host->host_lock);
1233 spin_unlock(&session->lock);
1234 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1235 spin_lock(host->host_lock);
1236 return SCSI_MLQUEUE_HOST_BUSY;
1239 spin_unlock(&session->lock);
1240 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
1241 if (!scsi_bidi_cmnd(sc))
1242 scsi_set_resid(sc, scsi_bufflen(sc));
1244 scsi_out(sc)->resid = scsi_out(sc)->length;
1245 scsi_in(sc)->resid = scsi_in(sc)->length;
1248 spin_lock(host->host_lock);
1251 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1253 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1255 if (depth > ISCSI_MAX_CMD_PER_LUN)
1256 depth = ISCSI_MAX_CMD_PER_LUN;
1257 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1258 return sdev->queue_depth;
1260 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1262 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1264 struct iscsi_session *session = cls_session->dd_data;
1266 spin_lock_bh(&session->lock);
1267 if (session->state != ISCSI_STATE_LOGGED_IN) {
1268 session->state = ISCSI_STATE_RECOVERY_FAILED;
1269 if (session->leadconn)
1270 wake_up(&session->leadconn->ehwait);
1272 spin_unlock_bh(&session->lock);
1274 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1276 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1278 struct iscsi_cls_session *cls_session;
1279 struct iscsi_session *session;
1280 struct iscsi_conn *conn;
1282 cls_session = starget_to_session(scsi_target(sc->device));
1283 session = cls_session->dd_data;
1284 conn = session->leadconn;
1286 mutex_lock(&session->eh_mutex);
1287 spin_lock_bh(&session->lock);
1288 if (session->state == ISCSI_STATE_TERMINATE) {
1290 debug_scsi("failing host reset: session terminated "
1291 "[CID %d age %d]\n", conn->id, session->age);
1292 spin_unlock_bh(&session->lock);
1293 mutex_unlock(&session->eh_mutex);
1297 spin_unlock_bh(&session->lock);
1298 mutex_unlock(&session->eh_mutex);
1300 * we drop the lock here but the leadconn cannot be destoyed while
1301 * we are in the scsi eh
1303 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1305 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1306 wait_event_interruptible(conn->ehwait,
1307 session->state == ISCSI_STATE_TERMINATE ||
1308 session->state == ISCSI_STATE_LOGGED_IN ||
1309 session->state == ISCSI_STATE_RECOVERY_FAILED);
1310 if (signal_pending(current))
1311 flush_signals(current);
1313 mutex_lock(&session->eh_mutex);
1314 spin_lock_bh(&session->lock);
1315 if (session->state == ISCSI_STATE_LOGGED_IN)
1316 iscsi_session_printk(KERN_INFO, session,
1317 "host reset succeeded\n");
1320 spin_unlock_bh(&session->lock);
1321 mutex_unlock(&session->eh_mutex);
1324 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1326 static void iscsi_tmf_timedout(unsigned long data)
1328 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1329 struct iscsi_session *session = conn->session;
1331 spin_lock(&session->lock);
1332 if (conn->tmf_state == TMF_QUEUED) {
1333 conn->tmf_state = TMF_TIMEDOUT;
1334 debug_scsi("tmf timedout\n");
1335 /* unblock eh_abort() */
1336 wake_up(&conn->ehwait);
1338 spin_unlock(&session->lock);
1341 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1342 struct iscsi_tm *hdr, int age,
1345 struct iscsi_session *session = conn->session;
1346 struct iscsi_task *task;
1348 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1351 spin_unlock_bh(&session->lock);
1352 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1353 spin_lock_bh(&session->lock);
1354 debug_scsi("tmf exec failure\n");
1357 conn->tmfcmd_pdus_cnt++;
1358 conn->tmf_timer.expires = timeout * HZ + jiffies;
1359 conn->tmf_timer.function = iscsi_tmf_timedout;
1360 conn->tmf_timer.data = (unsigned long)conn;
1361 add_timer(&conn->tmf_timer);
1362 debug_scsi("tmf set timeout\n");
1364 spin_unlock_bh(&session->lock);
1365 mutex_unlock(&session->eh_mutex);
1368 * block eh thread until:
1372 * 3) session is terminated or restarted or userspace has
1373 * given up on recovery
1375 wait_event_interruptible(conn->ehwait, age != session->age ||
1376 session->state != ISCSI_STATE_LOGGED_IN ||
1377 conn->tmf_state != TMF_QUEUED);
1378 if (signal_pending(current))
1379 flush_signals(current);
1380 del_timer_sync(&conn->tmf_timer);
1382 mutex_lock(&session->eh_mutex);
1383 spin_lock_bh(&session->lock);
1384 /* if the session drops it will clean up the task */
1385 if (age != session->age ||
1386 session->state != ISCSI_STATE_LOGGED_IN)
1392 * Fail commands. session lock held and recv side suspended and xmit
1395 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1398 struct iscsi_task *task, *tmp;
1400 if (conn->task && (conn->task->sc->device->lun == lun || lun == -1))
1404 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1405 if (lun == task->sc->device->lun || lun == -1) {
1406 debug_scsi("failing pending sc %p itt 0x%x\n",
1407 task->sc, task->itt);
1408 fail_command(conn, task, error << 16);
1412 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1413 if (lun == task->sc->device->lun || lun == -1) {
1414 debug_scsi("failing requeued sc %p itt 0x%x\n",
1415 task->sc, task->itt);
1416 fail_command(conn, task, error << 16);
1420 /* fail all other running */
1421 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1422 if (lun == task->sc->device->lun || lun == -1) {
1423 debug_scsi("failing in progress sc %p itt 0x%x\n",
1424 task->sc, task->itt);
1425 fail_command(conn, task, DID_BUS_BUSY << 16);
1430 void iscsi_suspend_tx(struct iscsi_conn *conn)
1432 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1433 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1434 scsi_flush_work(conn->session->host);
1436 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1438 static void iscsi_start_tx(struct iscsi_conn *conn)
1440 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1441 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1442 scsi_queue_work(conn->session->host, &conn->xmitwork);
1445 static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1447 struct iscsi_cls_session *cls_session;
1448 struct iscsi_session *session;
1449 struct iscsi_conn *conn;
1450 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1452 cls_session = starget_to_session(scsi_target(scmd->device));
1453 session = cls_session->dd_data;
1455 debug_scsi("scsi cmd %p timedout\n", scmd);
1457 spin_lock(&session->lock);
1458 if (session->state != ISCSI_STATE_LOGGED_IN) {
1460 * We are probably in the middle of iscsi recovery so let
1461 * that complete and handle the error.
1463 rc = EH_RESET_TIMER;
1467 conn = session->leadconn;
1469 /* In the middle of shuting down */
1470 rc = EH_RESET_TIMER;
1474 if (!conn->recv_timeout && !conn->ping_timeout)
1477 * if the ping timedout then we are in the middle of cleaning up
1478 * and can let the iscsi eh handle it
1480 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1481 (conn->ping_timeout * HZ), jiffies))
1482 rc = EH_RESET_TIMER;
1484 * if we are about to check the transport then give the command
1487 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1489 rc = EH_RESET_TIMER;
1490 /* if in the middle of checking the transport then give us more time */
1491 if (conn->ping_task)
1492 rc = EH_RESET_TIMER;
1494 spin_unlock(&session->lock);
1495 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1499 static void iscsi_check_transport_timeouts(unsigned long data)
1501 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1502 struct iscsi_session *session = conn->session;
1503 unsigned long recv_timeout, next_timeout = 0, last_recv;
1505 spin_lock(&session->lock);
1506 if (session->state != ISCSI_STATE_LOGGED_IN)
1509 recv_timeout = conn->recv_timeout;
1514 last_recv = conn->last_recv;
1515 if (conn->ping_task &&
1516 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
1518 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1519 "expired, last rx %lu, last ping %lu, "
1520 "now %lu\n", conn->ping_timeout, last_recv,
1521 conn->last_ping, jiffies);
1522 spin_unlock(&session->lock);
1523 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1527 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
1528 /* send a ping to try to provoke some traffic */
1529 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1530 iscsi_send_nopout(conn, NULL);
1531 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
1533 next_timeout = last_recv + recv_timeout;
1535 debug_scsi("Setting next tmo %lu\n", next_timeout);
1536 mod_timer(&conn->transport_timer, next_timeout);
1538 spin_unlock(&session->lock);
1541 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
1542 struct iscsi_tm *hdr)
1544 memset(hdr, 0, sizeof(*hdr));
1545 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1546 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1547 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1548 memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
1549 hdr->rtt = task->hdr->itt;
1550 hdr->refcmdsn = task->hdr->cmdsn;
1553 int iscsi_eh_abort(struct scsi_cmnd *sc)
1555 struct iscsi_cls_session *cls_session;
1556 struct iscsi_session *session;
1557 struct iscsi_conn *conn;
1558 struct iscsi_task *task;
1559 struct iscsi_tm *hdr;
1562 cls_session = starget_to_session(scsi_target(sc->device));
1563 session = cls_session->dd_data;
1565 mutex_lock(&session->eh_mutex);
1566 spin_lock_bh(&session->lock);
1568 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1572 debug_scsi("sc never reached iscsi layer or it completed.\n");
1573 spin_unlock_bh(&session->lock);
1574 mutex_unlock(&session->eh_mutex);
1579 * If we are not logged in or we have started a new session
1580 * then let the host reset code handle this
1582 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1583 sc->SCp.phase != session->age) {
1584 spin_unlock_bh(&session->lock);
1585 mutex_unlock(&session->eh_mutex);
1589 conn = session->leadconn;
1590 conn->eh_abort_cnt++;
1593 task = (struct iscsi_task *)sc->SCp.ptr;
1594 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, task->itt);
1596 /* task completed before time out */
1598 debug_scsi("sc completed while abort in progress\n");
1602 if (task->state == ISCSI_TASK_PENDING) {
1603 fail_command(conn, task, DID_ABORT << 16);
1607 /* only have one tmf outstanding at a time */
1608 if (conn->tmf_state != TMF_INITIAL)
1610 conn->tmf_state = TMF_QUEUED;
1613 iscsi_prep_abort_task_pdu(task, hdr);
1615 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1620 switch (conn->tmf_state) {
1622 spin_unlock_bh(&session->lock);
1623 iscsi_suspend_tx(conn);
1625 * clean up task if aborted. grab the recv lock as a writer
1627 write_lock_bh(conn->recv_lock);
1628 spin_lock(&session->lock);
1629 fail_command(conn, task, DID_ABORT << 16);
1630 conn->tmf_state = TMF_INITIAL;
1631 spin_unlock(&session->lock);
1632 write_unlock_bh(conn->recv_lock);
1633 iscsi_start_tx(conn);
1634 goto success_unlocked;
1636 spin_unlock_bh(&session->lock);
1637 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1638 goto failed_unlocked;
1641 conn->tmf_state = TMF_INITIAL;
1642 /* task completed before tmf abort response */
1643 debug_scsi("sc completed while abort in progress\n");
1648 conn->tmf_state = TMF_INITIAL;
1653 spin_unlock_bh(&session->lock);
1655 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, task->itt);
1656 mutex_unlock(&session->eh_mutex);
1660 spin_unlock_bh(&session->lock);
1662 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1663 task ? task->itt : 0);
1664 mutex_unlock(&session->eh_mutex);
1667 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1669 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1671 memset(hdr, 0, sizeof(*hdr));
1672 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1673 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1674 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1675 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1676 hdr->rtt = RESERVED_ITT;
1679 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1681 struct iscsi_cls_session *cls_session;
1682 struct iscsi_session *session;
1683 struct iscsi_conn *conn;
1684 struct iscsi_tm *hdr;
1687 cls_session = starget_to_session(scsi_target(sc->device));
1688 session = cls_session->dd_data;
1690 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1692 mutex_lock(&session->eh_mutex);
1693 spin_lock_bh(&session->lock);
1695 * Just check if we are not logged in. We cannot check for
1696 * the phase because the reset could come from a ioctl.
1698 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1700 conn = session->leadconn;
1702 /* only have one tmf outstanding at a time */
1703 if (conn->tmf_state != TMF_INITIAL)
1705 conn->tmf_state = TMF_QUEUED;
1708 iscsi_prep_lun_reset_pdu(sc, hdr);
1710 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1711 session->lu_reset_timeout)) {
1716 switch (conn->tmf_state) {
1720 spin_unlock_bh(&session->lock);
1721 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1724 conn->tmf_state = TMF_INITIAL;
1729 spin_unlock_bh(&session->lock);
1731 iscsi_suspend_tx(conn);
1732 /* need to grab the recv lock then session lock */
1733 write_lock_bh(conn->recv_lock);
1734 spin_lock(&session->lock);
1735 fail_all_commands(conn, sc->device->lun, DID_ERROR);
1736 conn->tmf_state = TMF_INITIAL;
1737 spin_unlock(&session->lock);
1738 write_unlock_bh(conn->recv_lock);
1740 iscsi_start_tx(conn);
1744 spin_unlock_bh(&session->lock);
1746 debug_scsi("iscsi_eh_device_reset %s\n",
1747 rc == SUCCESS ? "SUCCESS" : "FAILED");
1748 mutex_unlock(&session->eh_mutex);
1751 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1754 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1755 * should be accessed via kfifo_{get,put} on q->queue.
1756 * Optionally, the caller can obtain the array of object pointers
1757 * by passing in a non-NULL @items pointer
1760 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1762 int i, num_arrays = 1;
1764 memset(q, 0, sizeof(*q));
1768 /* If the user passed an items pointer, he wants a copy of
1772 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1773 if (q->pool == NULL)
1776 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1778 if (q->queue == ERR_PTR(-ENOMEM))
1781 for (i = 0; i < max; i++) {
1782 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
1783 if (q->pool[i] == NULL) {
1787 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1791 *items = q->pool + max;
1792 memcpy(*items, q->pool, max * sizeof(void *));
1801 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1803 void iscsi_pool_free(struct iscsi_pool *q)
1807 for (i = 0; i < q->max; i++)
1812 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1815 * iscsi_host_add - add host to system
1817 * @pdev: parent device
1819 * This should be called by partial offload and software iscsi drivers
1820 * to add a host to the system.
1822 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
1824 return scsi_add_host(shost, pdev);
1826 EXPORT_SYMBOL_GPL(iscsi_host_add);
1829 * iscsi_host_alloc - allocate a host and driver data
1830 * @sht: scsi host template
1831 * @dd_data_size: driver host data size
1832 * @qdepth: default device queue depth
1834 * This should be called by partial offload and software iscsi drivers.
1835 * To access the driver specific memory use the iscsi_host_priv() macro.
1837 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
1838 int dd_data_size, uint16_t qdepth)
1840 struct Scsi_Host *shost;
1842 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
1845 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1847 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1849 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1850 "Queue depth must be between 1 and %d.\n",
1851 qdepth, ISCSI_MAX_CMD_PER_LUN);
1852 qdepth = ISCSI_DEF_CMD_PER_LUN;
1854 shost->cmd_per_lun = qdepth;
1857 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
1860 * iscsi_host_remove - remove host and sessions
1863 * This will also remove any sessions attached to the host, but if userspace
1864 * is managing the session at the same time this will break. TODO: add
1865 * refcounting to the netlink iscsi interface so a rmmod or host hot unplug
1866 * does not remove the memory from under us.
1868 void iscsi_host_remove(struct Scsi_Host *shost)
1870 iscsi_host_for_each_session(shost, iscsi_session_teardown);
1871 scsi_remove_host(shost);
1873 EXPORT_SYMBOL_GPL(iscsi_host_remove);
1875 void iscsi_host_free(struct Scsi_Host *shost)
1877 struct iscsi_host *ihost = shost_priv(shost);
1879 kfree(ihost->netdev);
1880 kfree(ihost->hwaddress);
1881 kfree(ihost->initiatorname);
1882 scsi_host_put(shost);
1884 EXPORT_SYMBOL_GPL(iscsi_host_free);
1887 * iscsi_session_setup - create iscsi cls session and host and session
1888 * @iscsit: iscsi transport template
1890 * @cmds_max: session can queue
1891 * @cmd_task_size: LLD task private data size
1892 * @initial_cmdsn: initial CmdSN
1894 * This can be used by software iscsi_transports that allocate
1895 * a session per scsi host.
1897 struct iscsi_cls_session *
1898 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
1899 uint16_t scsi_cmds_max, int cmd_task_size,
1900 uint32_t initial_cmdsn, unsigned int id)
1902 struct iscsi_session *session;
1903 struct iscsi_cls_session *cls_session;
1904 int cmd_i, cmds_max;
1907 * The iscsi layer needs some tasks for nop handling and tmfs.
1909 if (scsi_cmds_max < 1)
1910 scsi_cmds_max = ISCSI_MGMT_CMDS_MAX;
1911 if ((scsi_cmds_max + ISCSI_MGMT_CMDS_MAX) >= ISCSI_MGMT_ITT_OFFSET) {
1912 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1913 "can_queue must be less than %d.\n",
1915 ISCSI_MGMT_ITT_OFFSET - ISCSI_MGMT_CMDS_MAX);
1916 scsi_cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1918 cmds_max = roundup_pow_of_two(scsi_cmds_max + ISCSI_MGMT_CMDS_MAX);
1920 cls_session = iscsi_alloc_session(shost, iscsit,
1921 sizeof(struct iscsi_session));
1924 session = cls_session->dd_data;
1925 session->cls_session = cls_session;
1926 session->host = shost;
1927 session->state = ISCSI_STATE_FREE;
1928 session->fast_abort = 1;
1929 session->lu_reset_timeout = 15;
1930 session->abort_timeout = 10;
1931 session->scsi_cmds_max = scsi_cmds_max;
1932 session->cmds_max = cmds_max;
1933 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1934 session->exp_cmdsn = initial_cmdsn + 1;
1935 session->max_cmdsn = initial_cmdsn + 1;
1936 session->max_r2t = 1;
1937 session->tt = iscsit;
1938 mutex_init(&session->eh_mutex);
1939 spin_lock_init(&session->lock);
1941 /* initialize SCSI PDU commands pool */
1942 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1943 (void***)&session->cmds,
1944 cmd_task_size + sizeof(struct iscsi_task)))
1945 goto cmdpool_alloc_fail;
1947 /* pre-format cmds pool with ITT */
1948 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1949 struct iscsi_task *task = session->cmds[cmd_i];
1952 task->dd_data = &task[1];
1954 INIT_LIST_HEAD(&task->running);
1957 if (!try_module_get(iscsit->owner))
1958 goto module_get_fail;
1960 if (iscsi_add_session(cls_session, id))
1961 goto cls_session_fail;
1965 module_put(iscsit->owner);
1967 iscsi_pool_free(&session->cmdpool);
1969 iscsi_free_session(cls_session);
1972 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1975 * iscsi_session_teardown - destroy session, host, and cls_session
1976 * @cls_session: iscsi session
1978 * The driver must have called iscsi_remove_session before
1981 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1983 struct iscsi_session *session = cls_session->dd_data;
1984 struct module *owner = cls_session->transport->owner;
1986 iscsi_pool_free(&session->cmdpool);
1988 kfree(session->password);
1989 kfree(session->password_in);
1990 kfree(session->username);
1991 kfree(session->username_in);
1992 kfree(session->targetname);
1994 iscsi_destroy_session(cls_session);
1997 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2000 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2001 * @cls_session: iscsi_cls_session
2002 * @dd_size: private driver data size
2005 struct iscsi_cls_conn *
2006 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2009 struct iscsi_session *session = cls_session->dd_data;
2010 struct iscsi_conn *conn;
2011 struct iscsi_cls_conn *cls_conn;
2014 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2018 conn = cls_conn->dd_data;
2019 memset(conn, 0, sizeof(*conn) + dd_size);
2021 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2022 conn->session = session;
2023 conn->cls_conn = cls_conn;
2024 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2025 conn->id = conn_idx;
2026 conn->exp_statsn = 0;
2027 conn->tmf_state = TMF_INITIAL;
2029 init_timer(&conn->transport_timer);
2030 conn->transport_timer.data = (unsigned long)conn;
2031 conn->transport_timer.function = iscsi_check_transport_timeouts;
2033 INIT_LIST_HEAD(&conn->run_list);
2034 INIT_LIST_HEAD(&conn->mgmt_run_list);
2035 INIT_LIST_HEAD(&conn->mgmtqueue);
2036 INIT_LIST_HEAD(&conn->xmitqueue);
2037 INIT_LIST_HEAD(&conn->requeue);
2038 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2040 /* allocate login_task used for the login/text sequences */
2041 spin_lock_bh(&session->lock);
2042 if (!__kfifo_get(session->cmdpool.queue,
2043 (void*)&conn->login_task,
2045 spin_unlock_bh(&session->lock);
2046 goto login_task_alloc_fail;
2048 spin_unlock_bh(&session->lock);
2050 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
2052 goto login_task_data_alloc_fail;
2053 conn->login_task->data = conn->data = data;
2055 init_timer(&conn->tmf_timer);
2056 init_waitqueue_head(&conn->ehwait);
2060 login_task_data_alloc_fail:
2061 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2063 login_task_alloc_fail:
2064 iscsi_destroy_conn(cls_conn);
2067 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2070 * iscsi_conn_teardown - teardown iscsi connection
2071 * cls_conn: iscsi class connection
2073 * TODO: we may need to make this into a two step process
2074 * like scsi-mls remove + put host
2076 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2078 struct iscsi_conn *conn = cls_conn->dd_data;
2079 struct iscsi_session *session = conn->session;
2080 unsigned long flags;
2082 del_timer_sync(&conn->transport_timer);
2084 spin_lock_bh(&session->lock);
2085 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2086 if (session->leadconn == conn) {
2088 * leading connection? then give up on recovery.
2090 session->state = ISCSI_STATE_TERMINATE;
2091 wake_up(&conn->ehwait);
2093 spin_unlock_bh(&session->lock);
2096 * Block until all in-progress commands for this connection
2100 spin_lock_irqsave(session->host->host_lock, flags);
2101 if (!session->host->host_busy) { /* OK for ERL == 0 */
2102 spin_unlock_irqrestore(session->host->host_lock, flags);
2105 spin_unlock_irqrestore(session->host->host_lock, flags);
2106 msleep_interruptible(500);
2107 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2108 "host_busy %d host_failed %d\n",
2109 session->host->host_busy,
2110 session->host->host_failed);
2112 * force eh_abort() to unblock
2114 wake_up(&conn->ehwait);
2117 /* flush queued up work because we free the connection below */
2118 iscsi_suspend_tx(conn);
2120 spin_lock_bh(&session->lock);
2122 kfree(conn->persistent_address);
2123 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2125 if (session->leadconn == conn)
2126 session->leadconn = NULL;
2127 spin_unlock_bh(&session->lock);
2129 iscsi_destroy_conn(cls_conn);
2131 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2133 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2135 struct iscsi_conn *conn = cls_conn->dd_data;
2136 struct iscsi_session *session = conn->session;
2139 iscsi_conn_printk(KERN_ERR, conn,
2140 "can't start unbound connection\n");
2144 if ((session->imm_data_en || !session->initial_r2t_en) &&
2145 session->first_burst > session->max_burst) {
2146 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2147 "first_burst %d max_burst %d\n",
2148 session->first_burst, session->max_burst);
2152 if (conn->ping_timeout && !conn->recv_timeout) {
2153 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2154 "zero. Using 5 seconds\n.");
2155 conn->recv_timeout = 5;
2158 if (conn->recv_timeout && !conn->ping_timeout) {
2159 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2160 "zero. Using 5 seconds.\n");
2161 conn->ping_timeout = 5;
2164 spin_lock_bh(&session->lock);
2165 conn->c_stage = ISCSI_CONN_STARTED;
2166 session->state = ISCSI_STATE_LOGGED_IN;
2167 session->queued_cmdsn = session->cmdsn;
2169 conn->last_recv = jiffies;
2170 conn->last_ping = jiffies;
2171 if (conn->recv_timeout && conn->ping_timeout)
2172 mod_timer(&conn->transport_timer,
2173 jiffies + (conn->recv_timeout * HZ));
2175 switch(conn->stop_stage) {
2176 case STOP_CONN_RECOVER:
2178 * unblock eh_abort() if it is blocked. re-try all
2179 * commands after successful recovery
2181 conn->stop_stage = 0;
2182 conn->tmf_state = TMF_INITIAL;
2184 if (session->age == 16)
2187 case STOP_CONN_TERM:
2188 conn->stop_stage = 0;
2193 spin_unlock_bh(&session->lock);
2195 iscsi_unblock_session(session->cls_session);
2196 wake_up(&conn->ehwait);
2199 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2202 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2204 struct iscsi_task *task, *tmp;
2206 /* handle pending */
2207 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2208 debug_scsi("flushing pending mgmt task itt 0x%x\n", task->itt);
2209 /* release ref from prep task */
2210 __iscsi_put_task(task);
2213 /* handle running */
2214 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2215 debug_scsi("flushing running mgmt task itt 0x%x\n", task->itt);
2216 /* release ref from prep task */
2217 __iscsi_put_task(task);
2223 static void iscsi_start_session_recovery(struct iscsi_session *session,
2224 struct iscsi_conn *conn, int flag)
2228 del_timer_sync(&conn->transport_timer);
2230 mutex_lock(&session->eh_mutex);
2231 spin_lock_bh(&session->lock);
2232 if (conn->stop_stage == STOP_CONN_TERM) {
2233 spin_unlock_bh(&session->lock);
2234 mutex_unlock(&session->eh_mutex);
2239 * The LLD either freed/unset the lock on us, or userspace called
2240 * stop but did not create a proper connection (connection was never
2241 * bound or it was unbound then stop was called).
2243 if (!conn->recv_lock) {
2244 spin_unlock_bh(&session->lock);
2245 mutex_unlock(&session->eh_mutex);
2250 * When this is called for the in_login state, we only want to clean
2251 * up the login task and connection. We do not need to block and set
2252 * the recovery state again
2254 if (flag == STOP_CONN_TERM)
2255 session->state = ISCSI_STATE_TERMINATE;
2256 else if (conn->stop_stage != STOP_CONN_RECOVER)
2257 session->state = ISCSI_STATE_IN_RECOVERY;
2259 old_stop_stage = conn->stop_stage;
2260 conn->stop_stage = flag;
2261 conn->c_stage = ISCSI_CONN_STOPPED;
2262 spin_unlock_bh(&session->lock);
2264 iscsi_suspend_tx(conn);
2266 write_lock_bh(conn->recv_lock);
2267 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2268 write_unlock_bh(conn->recv_lock);
2271 * for connection level recovery we should not calculate
2272 * header digest. conn->hdr_size used for optimization
2273 * in hdr_extract() and will be re-negotiated at
2276 if (flag == STOP_CONN_RECOVER) {
2277 conn->hdrdgst_en = 0;
2278 conn->datadgst_en = 0;
2279 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2280 old_stop_stage != STOP_CONN_RECOVER) {
2281 debug_scsi("blocking session\n");
2282 iscsi_block_session(session->cls_session);
2289 spin_lock_bh(&session->lock);
2290 fail_all_commands(conn, -1,
2291 STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
2292 flush_control_queues(session, conn);
2293 spin_unlock_bh(&session->lock);
2294 mutex_unlock(&session->eh_mutex);
2297 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2299 struct iscsi_conn *conn = cls_conn->dd_data;
2300 struct iscsi_session *session = conn->session;
2303 case STOP_CONN_RECOVER:
2304 case STOP_CONN_TERM:
2305 iscsi_start_session_recovery(session, conn, flag);
2308 iscsi_conn_printk(KERN_ERR, conn,
2309 "invalid stop flag %d\n", flag);
2312 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2314 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2315 struct iscsi_cls_conn *cls_conn, int is_leading)
2317 struct iscsi_session *session = cls_session->dd_data;
2318 struct iscsi_conn *conn = cls_conn->dd_data;
2320 spin_lock_bh(&session->lock);
2322 session->leadconn = conn;
2323 spin_unlock_bh(&session->lock);
2326 * Unblock xmitworker(), Login Phase will pass through.
2328 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2329 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2332 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2335 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2336 enum iscsi_param param, char *buf, int buflen)
2338 struct iscsi_conn *conn = cls_conn->dd_data;
2339 struct iscsi_session *session = conn->session;
2343 case ISCSI_PARAM_FAST_ABORT:
2344 sscanf(buf, "%d", &session->fast_abort);
2346 case ISCSI_PARAM_ABORT_TMO:
2347 sscanf(buf, "%d", &session->abort_timeout);
2349 case ISCSI_PARAM_LU_RESET_TMO:
2350 sscanf(buf, "%d", &session->lu_reset_timeout);
2352 case ISCSI_PARAM_PING_TMO:
2353 sscanf(buf, "%d", &conn->ping_timeout);
2355 case ISCSI_PARAM_RECV_TMO:
2356 sscanf(buf, "%d", &conn->recv_timeout);
2358 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2359 sscanf(buf, "%d", &conn->max_recv_dlength);
2361 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2362 sscanf(buf, "%d", &conn->max_xmit_dlength);
2364 case ISCSI_PARAM_HDRDGST_EN:
2365 sscanf(buf, "%d", &conn->hdrdgst_en);
2367 case ISCSI_PARAM_DATADGST_EN:
2368 sscanf(buf, "%d", &conn->datadgst_en);
2370 case ISCSI_PARAM_INITIAL_R2T_EN:
2371 sscanf(buf, "%d", &session->initial_r2t_en);
2373 case ISCSI_PARAM_MAX_R2T:
2374 sscanf(buf, "%d", &session->max_r2t);
2376 case ISCSI_PARAM_IMM_DATA_EN:
2377 sscanf(buf, "%d", &session->imm_data_en);
2379 case ISCSI_PARAM_FIRST_BURST:
2380 sscanf(buf, "%d", &session->first_burst);
2382 case ISCSI_PARAM_MAX_BURST:
2383 sscanf(buf, "%d", &session->max_burst);
2385 case ISCSI_PARAM_PDU_INORDER_EN:
2386 sscanf(buf, "%d", &session->pdu_inorder_en);
2388 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2389 sscanf(buf, "%d", &session->dataseq_inorder_en);
2391 case ISCSI_PARAM_ERL:
2392 sscanf(buf, "%d", &session->erl);
2394 case ISCSI_PARAM_IFMARKER_EN:
2395 sscanf(buf, "%d", &value);
2398 case ISCSI_PARAM_OFMARKER_EN:
2399 sscanf(buf, "%d", &value);
2402 case ISCSI_PARAM_EXP_STATSN:
2403 sscanf(buf, "%u", &conn->exp_statsn);
2405 case ISCSI_PARAM_USERNAME:
2406 kfree(session->username);
2407 session->username = kstrdup(buf, GFP_KERNEL);
2408 if (!session->username)
2411 case ISCSI_PARAM_USERNAME_IN:
2412 kfree(session->username_in);
2413 session->username_in = kstrdup(buf, GFP_KERNEL);
2414 if (!session->username_in)
2417 case ISCSI_PARAM_PASSWORD:
2418 kfree(session->password);
2419 session->password = kstrdup(buf, GFP_KERNEL);
2420 if (!session->password)
2423 case ISCSI_PARAM_PASSWORD_IN:
2424 kfree(session->password_in);
2425 session->password_in = kstrdup(buf, GFP_KERNEL);
2426 if (!session->password_in)
2429 case ISCSI_PARAM_TARGET_NAME:
2430 /* this should not change between logins */
2431 if (session->targetname)
2434 session->targetname = kstrdup(buf, GFP_KERNEL);
2435 if (!session->targetname)
2438 case ISCSI_PARAM_TPGT:
2439 sscanf(buf, "%d", &session->tpgt);
2441 case ISCSI_PARAM_PERSISTENT_PORT:
2442 sscanf(buf, "%d", &conn->persistent_port);
2444 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2446 * this is the address returned in discovery so it should
2447 * not change between logins.
2449 if (conn->persistent_address)
2452 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2453 if (!conn->persistent_address)
2462 EXPORT_SYMBOL_GPL(iscsi_set_param);
2464 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2465 enum iscsi_param param, char *buf)
2467 struct iscsi_session *session = cls_session->dd_data;
2471 case ISCSI_PARAM_FAST_ABORT:
2472 len = sprintf(buf, "%d\n", session->fast_abort);
2474 case ISCSI_PARAM_ABORT_TMO:
2475 len = sprintf(buf, "%d\n", session->abort_timeout);
2477 case ISCSI_PARAM_LU_RESET_TMO:
2478 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2480 case ISCSI_PARAM_INITIAL_R2T_EN:
2481 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2483 case ISCSI_PARAM_MAX_R2T:
2484 len = sprintf(buf, "%hu\n", session->max_r2t);
2486 case ISCSI_PARAM_IMM_DATA_EN:
2487 len = sprintf(buf, "%d\n", session->imm_data_en);
2489 case ISCSI_PARAM_FIRST_BURST:
2490 len = sprintf(buf, "%u\n", session->first_burst);
2492 case ISCSI_PARAM_MAX_BURST:
2493 len = sprintf(buf, "%u\n", session->max_burst);
2495 case ISCSI_PARAM_PDU_INORDER_EN:
2496 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2498 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2499 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2501 case ISCSI_PARAM_ERL:
2502 len = sprintf(buf, "%d\n", session->erl);
2504 case ISCSI_PARAM_TARGET_NAME:
2505 len = sprintf(buf, "%s\n", session->targetname);
2507 case ISCSI_PARAM_TPGT:
2508 len = sprintf(buf, "%d\n", session->tpgt);
2510 case ISCSI_PARAM_USERNAME:
2511 len = sprintf(buf, "%s\n", session->username);
2513 case ISCSI_PARAM_USERNAME_IN:
2514 len = sprintf(buf, "%s\n", session->username_in);
2516 case ISCSI_PARAM_PASSWORD:
2517 len = sprintf(buf, "%s\n", session->password);
2519 case ISCSI_PARAM_PASSWORD_IN:
2520 len = sprintf(buf, "%s\n", session->password_in);
2528 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2530 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2531 enum iscsi_param param, char *buf)
2533 struct iscsi_conn *conn = cls_conn->dd_data;
2537 case ISCSI_PARAM_PING_TMO:
2538 len = sprintf(buf, "%u\n", conn->ping_timeout);
2540 case ISCSI_PARAM_RECV_TMO:
2541 len = sprintf(buf, "%u\n", conn->recv_timeout);
2543 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2544 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2546 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2547 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2549 case ISCSI_PARAM_HDRDGST_EN:
2550 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2552 case ISCSI_PARAM_DATADGST_EN:
2553 len = sprintf(buf, "%d\n", conn->datadgst_en);
2555 case ISCSI_PARAM_IFMARKER_EN:
2556 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2558 case ISCSI_PARAM_OFMARKER_EN:
2559 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2561 case ISCSI_PARAM_EXP_STATSN:
2562 len = sprintf(buf, "%u\n", conn->exp_statsn);
2564 case ISCSI_PARAM_PERSISTENT_PORT:
2565 len = sprintf(buf, "%d\n", conn->persistent_port);
2567 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2568 len = sprintf(buf, "%s\n", conn->persistent_address);
2576 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2578 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2581 struct iscsi_host *ihost = shost_priv(shost);
2585 case ISCSI_HOST_PARAM_NETDEV_NAME:
2587 len = sprintf(buf, "%s\n", "default");
2589 len = sprintf(buf, "%s\n", ihost->netdev);
2591 case ISCSI_HOST_PARAM_HWADDRESS:
2592 if (!ihost->hwaddress)
2593 len = sprintf(buf, "%s\n", "default");
2595 len = sprintf(buf, "%s\n", ihost->hwaddress);
2597 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2598 if (!ihost->initiatorname)
2599 len = sprintf(buf, "%s\n", "unknown");
2601 len = sprintf(buf, "%s\n", ihost->initiatorname);
2603 case ISCSI_HOST_PARAM_IPADDRESS:
2604 if (!strlen(ihost->local_address))
2605 len = sprintf(buf, "%s\n", "unknown");
2607 len = sprintf(buf, "%s\n",
2608 ihost->local_address);
2615 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2617 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2618 char *buf, int buflen)
2620 struct iscsi_host *ihost = shost_priv(shost);
2623 case ISCSI_HOST_PARAM_NETDEV_NAME:
2625 ihost->netdev = kstrdup(buf, GFP_KERNEL);
2627 case ISCSI_HOST_PARAM_HWADDRESS:
2628 if (!ihost->hwaddress)
2629 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
2631 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2632 if (!ihost->initiatorname)
2633 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
2641 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2643 MODULE_AUTHOR("Mike Christie");
2644 MODULE_DESCRIPTION("iSCSI library functions");
2645 MODULE_LICENSE("GPL");