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 <asm/unaligned.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi.h>
35 #include <scsi/iscsi_proto.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_iscsi.h>
38 #include <scsi/libiscsi.h>
40 struct iscsi_session *
41 class_to_transport_session(struct iscsi_cls_session *cls_session)
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
46 EXPORT_SYMBOL_GPL(class_to_transport_session);
48 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
49 #define SNA32_CHECK 2147483648UL
51 static int iscsi_sna_lt(u32 n1, u32 n2)
53 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
57 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
58 static int iscsi_sna_lte(u32 n1, u32 n2)
60 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
61 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
65 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
67 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
68 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
71 * standard specifies this check for when to update expected and
72 * max sequence numbers
74 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
77 if (exp_cmdsn != session->exp_cmdsn &&
78 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
79 session->exp_cmdsn = exp_cmdsn;
81 if (max_cmdsn != session->max_cmdsn &&
82 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
83 session->max_cmdsn = max_cmdsn;
85 * if the window closed with IO queued, then kick the
88 if (!list_empty(&session->leadconn->xmitqueue) ||
89 !list_empty(&session->leadconn->mgmtqueue))
90 scsi_queue_work(session->host,
91 &session->leadconn->xmitwork);
94 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
96 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
97 struct iscsi_data *hdr)
99 struct iscsi_conn *conn = ctask->conn;
101 memset(hdr, 0, sizeof(struct iscsi_data));
102 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
103 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
104 ctask->unsol_datasn++;
105 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
106 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
108 hdr->itt = ctask->hdr->itt;
109 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
110 hdr->offset = cpu_to_be32(ctask->unsol_offset);
112 if (ctask->unsol_count > conn->max_xmit_dlength) {
113 hton24(hdr->dlength, conn->max_xmit_dlength);
114 ctask->data_count = conn->max_xmit_dlength;
115 ctask->unsol_offset += ctask->data_count;
118 hton24(hdr->dlength, ctask->unsol_count);
119 ctask->data_count = ctask->unsol_count;
120 hdr->flags = ISCSI_FLAG_CMD_FINAL;
123 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
125 static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
127 unsigned exp_len = ctask->hdr_len + len;
129 if (exp_len > ctask->hdr_max) {
134 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
135 ctask->hdr_len = exp_len;
140 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
141 * @ctask: iscsi cmd task
143 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
144 * fields like dlength or final based on how much data it sends
146 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
148 struct iscsi_conn *conn = ctask->conn;
149 struct iscsi_session *session = conn->session;
150 struct iscsi_cmd *hdr = ctask->hdr;
151 struct scsi_cmnd *sc = ctask->sc;
156 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
159 hdr->opcode = ISCSI_OP_SCSI_CMD;
160 hdr->flags = ISCSI_ATTR_SIMPLE;
161 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
162 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
163 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
164 hdr->cmdsn = cpu_to_be32(session->cmdsn);
166 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
167 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
168 if (sc->cmd_len < MAX_COMMAND_SIZE)
169 memset(&hdr->cdb[sc->cmd_len], 0,
170 MAX_COMMAND_SIZE - sc->cmd_len);
172 ctask->data_count = 0;
173 ctask->imm_count = 0;
174 if (sc->sc_data_direction == DMA_TO_DEVICE) {
175 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
179 * imm_count bytes to be sent right after
182 * unsol_count bytes(as Data-Out) to be sent
183 * without R2T ack right after
186 * r2t_data_count bytes to be sent via R2T ack's
188 * pad_count bytes to be sent as zero-padding
190 ctask->unsol_count = 0;
191 ctask->unsol_offset = 0;
192 ctask->unsol_datasn = 0;
194 if (session->imm_data_en) {
195 if (scsi_bufflen(sc) >= session->first_burst)
196 ctask->imm_count = min(session->first_burst,
197 conn->max_xmit_dlength);
199 ctask->imm_count = min(scsi_bufflen(sc),
200 conn->max_xmit_dlength);
201 hton24(ctask->hdr->dlength, ctask->imm_count);
203 zero_data(ctask->hdr->dlength);
205 if (!session->initial_r2t_en) {
206 ctask->unsol_count = min((session->first_burst),
207 (scsi_bufflen(sc))) - ctask->imm_count;
208 ctask->unsol_offset = ctask->imm_count;
211 if (!ctask->unsol_count)
212 /* No unsolicit Data-Out's */
213 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
215 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
216 zero_data(hdr->dlength);
218 if (sc->sc_data_direction == DMA_FROM_DEVICE)
219 hdr->flags |= ISCSI_FLAG_CMD_READ;
222 /* calculate size of additional header segments (AHSs) */
223 hdrlength = ctask->hdr_len - sizeof(*hdr);
225 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
226 hdrlength /= ISCSI_PAD_LEN;
228 WARN_ON(hdrlength >= 256);
229 hdr->hlength = hdrlength & 0xFF;
231 conn->scsicmd_pdus_cnt++;
233 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
234 "cmdsn %d win %d]\n",
235 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
236 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
237 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
242 * iscsi_complete_command - return command back to scsi-ml
243 * @ctask: iscsi cmd task
245 * Must be called with session lock.
246 * This function returns the scsi command to scsi-ml and returns
247 * the cmd task to the pool of available cmd tasks.
249 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
251 struct iscsi_session *session = ctask->conn->session;
252 struct scsi_cmnd *sc = ctask->sc;
254 ctask->state = ISCSI_TASK_COMPLETED;
256 /* SCSI eh reuses commands to verify us */
258 list_del_init(&ctask->running);
259 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
263 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
265 atomic_inc(&ctask->refcount);
268 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
270 if (atomic_dec_and_test(&ctask->refcount))
271 iscsi_complete_command(ctask);
275 * session lock must be held
277 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
280 struct scsi_cmnd *sc;
286 if (ctask->state == ISCSI_TASK_PENDING)
288 * cmd never made it to the xmit thread, so we should not count
289 * the cmd in the sequencing
291 conn->session->queued_cmdsn--;
293 conn->session->tt->cleanup_cmd_task(conn, ctask);
296 scsi_set_resid(sc, scsi_bufflen(sc));
297 if (conn->ctask == ctask)
299 /* release ref from queuecommand */
300 __iscsi_put_ctask(ctask);
304 * iscsi_free_mgmt_task - return mgmt task back to pool
305 * @conn: iscsi connection
308 * Must be called with session lock.
310 void iscsi_free_mgmt_task(struct iscsi_conn *conn,
311 struct iscsi_mgmt_task *mtask)
313 list_del_init(&mtask->running);
314 if (conn->login_mtask == mtask)
317 if (conn->ping_mtask == mtask)
318 conn->ping_mtask = NULL;
319 __kfifo_put(conn->session->mgmtpool.queue,
320 (void*)&mtask, sizeof(void*));
322 EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
324 static struct iscsi_mgmt_task *
325 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
326 char *data, uint32_t data_size)
328 struct iscsi_session *session = conn->session;
329 struct iscsi_mgmt_task *mtask;
331 if (session->state == ISCSI_STATE_TERMINATE)
334 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
335 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
337 * Login and Text are sent serially, in
338 * request-followed-by-response sequence.
339 * Same mtask can be used. Same ITT must be used.
340 * Note that login_mtask is preallocated at conn_create().
342 mtask = conn->login_mtask;
344 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
345 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
347 if (!__kfifo_get(session->mgmtpool.queue,
348 (void*)&mtask, sizeof(void*)))
353 memcpy(mtask->data, data, data_size);
354 mtask->data_count = data_size;
356 mtask->data_count = 0;
358 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
359 INIT_LIST_HEAD(&mtask->running);
360 list_add_tail(&mtask->running, &conn->mgmtqueue);
364 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
365 char *data, uint32_t data_size)
367 struct iscsi_conn *conn = cls_conn->dd_data;
368 struct iscsi_session *session = conn->session;
371 spin_lock_bh(&session->lock);
372 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
374 spin_unlock_bh(&session->lock);
375 scsi_queue_work(session->host, &conn->xmitwork);
378 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
381 * iscsi_cmd_rsp - SCSI Command Response processing
382 * @conn: iscsi connection
384 * @ctask: scsi command task
385 * @data: cmd data buffer
386 * @datalen: len of buffer
388 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
389 * then completes the command and task.
391 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
392 struct iscsi_cmd_task *ctask, char *data,
395 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
396 struct iscsi_session *session = conn->session;
397 struct scsi_cmnd *sc = ctask->sc;
399 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
400 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
402 sc->result = (DID_OK << 16) | rhdr->cmd_status;
404 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
405 sc->result = DID_ERROR << 16;
409 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
414 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
415 "invalid data buffer size of %d\n", datalen);
416 sc->result = DID_BAD_TARGET << 16;
420 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
421 if (datalen < senselen)
422 goto invalid_datalen;
424 memcpy(sc->sense_buffer, data + 2,
425 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
426 debug_scsi("copied %d bytes of sense\n",
427 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
430 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
431 ISCSI_FLAG_CMD_OVERFLOW)) {
432 int res_count = be32_to_cpu(rhdr->residual_count);
435 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
436 res_count <= scsi_bufflen(sc)))
437 scsi_set_resid(sc, res_count);
439 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
440 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
441 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
442 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
445 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
446 (long)sc, sc->result, ctask->itt);
447 conn->scsirsp_pdus_cnt++;
449 __iscsi_put_ctask(ctask);
452 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
454 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
456 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
457 conn->tmfrsp_pdus_cnt++;
459 if (conn->tmf_state != TMF_QUEUED)
462 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
463 conn->tmf_state = TMF_SUCCESS;
464 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
465 conn->tmf_state = TMF_NOT_FOUND;
467 conn->tmf_state = TMF_FAILED;
468 wake_up(&conn->ehwait);
471 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
473 struct iscsi_nopout hdr;
474 struct iscsi_mgmt_task *mtask;
476 if (!rhdr && conn->ping_mtask)
479 memset(&hdr, 0, sizeof(struct iscsi_nopout));
480 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
481 hdr.flags = ISCSI_FLAG_CMD_FINAL;
484 memcpy(hdr.lun, rhdr->lun, 8);
486 hdr.itt = RESERVED_ITT;
488 hdr.ttt = RESERVED_ITT;
490 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
492 printk(KERN_ERR "Could not send nopout\n");
496 /* only track our nops */
498 conn->ping_mtask = mtask;
499 conn->last_ping = jiffies;
501 scsi_queue_work(conn->session->host, &conn->xmitwork);
504 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
505 char *data, int datalen)
507 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
508 struct iscsi_hdr rejected_pdu;
511 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
513 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
514 if (ntoh24(reject->dlength) > datalen)
515 return ISCSI_ERR_PROTO;
517 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
518 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
519 itt = get_itt(rejected_pdu.itt);
520 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
521 "due to DataDigest error.\n", itt,
522 rejected_pdu.opcode);
529 * __iscsi_complete_pdu - complete pdu
533 * @datalen: len of data buffer
535 * Completes pdu processing by freeing any resources allocated at
536 * queuecommand or send generic. session lock must be held and verify
537 * itt must have been called.
539 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
540 char *data, int datalen)
542 struct iscsi_session *session = conn->session;
543 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
544 struct iscsi_cmd_task *ctask;
545 struct iscsi_mgmt_task *mtask;
548 conn->last_recv = jiffies;
549 if (hdr->itt != RESERVED_ITT)
550 itt = get_itt(hdr->itt);
554 if (itt < session->cmds_max) {
555 ctask = session->cmds[itt];
557 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
558 opcode, conn->id, ctask->itt, datalen);
561 case ISCSI_OP_SCSI_CMD_RSP:
562 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
563 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
566 case ISCSI_OP_SCSI_DATA_IN:
567 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
568 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
569 conn->scsirsp_pdus_cnt++;
570 __iscsi_put_ctask(ctask);
574 /* LLD handles this for now */
577 rc = ISCSI_ERR_BAD_OPCODE;
580 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
581 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
582 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
584 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
585 opcode, conn->id, mtask->itt, datalen);
587 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
589 case ISCSI_OP_LOGOUT_RSP:
591 rc = ISCSI_ERR_PROTO;
594 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
596 case ISCSI_OP_LOGIN_RSP:
597 case ISCSI_OP_TEXT_RSP:
599 * login related PDU's exp_statsn is handled in
602 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
603 rc = ISCSI_ERR_CONN_FAILED;
604 iscsi_free_mgmt_task(conn, mtask);
606 case ISCSI_OP_SCSI_TMFUNC_RSP:
608 rc = ISCSI_ERR_PROTO;
612 iscsi_tmf_rsp(conn, hdr);
613 iscsi_free_mgmt_task(conn, mtask);
615 case ISCSI_OP_NOOP_IN:
616 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
618 rc = ISCSI_ERR_PROTO;
621 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
623 if (conn->ping_mtask != mtask) {
625 * If this is not in response to one of our
626 * nops then it must be from userspace.
628 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
630 rc = ISCSI_ERR_CONN_FAILED;
632 iscsi_free_mgmt_task(conn, mtask);
635 rc = ISCSI_ERR_BAD_OPCODE;
638 } else if (itt == ~0U) {
639 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
642 case ISCSI_OP_NOOP_IN:
644 rc = ISCSI_ERR_PROTO;
648 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
651 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
653 case ISCSI_OP_REJECT:
654 rc = iscsi_handle_reject(conn, hdr, data, datalen);
656 case ISCSI_OP_ASYNC_EVENT:
657 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
658 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
659 rc = ISCSI_ERR_CONN_FAILED;
662 rc = ISCSI_ERR_BAD_OPCODE;
666 rc = ISCSI_ERR_BAD_ITT;
670 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
672 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
673 char *data, int datalen)
677 spin_lock(&conn->session->lock);
678 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
679 spin_unlock(&conn->session->lock);
682 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
684 /* verify itt (itt encoding: age+cid+itt) */
685 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
688 struct iscsi_session *session = conn->session;
689 struct iscsi_cmd_task *ctask;
692 if (hdr->itt != RESERVED_ITT) {
693 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
694 (session->age << ISCSI_AGE_SHIFT)) {
695 printk(KERN_ERR "iscsi: received itt %x expected "
696 "session age (%x)\n", (__force u32)hdr->itt,
697 session->age & ISCSI_AGE_MASK);
698 return ISCSI_ERR_BAD_ITT;
701 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
702 (conn->id << ISCSI_CID_SHIFT)) {
703 printk(KERN_ERR "iscsi: received itt %x, expected "
704 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
705 return ISCSI_ERR_BAD_ITT;
707 itt = get_itt(hdr->itt);
711 if (itt < session->cmds_max) {
712 ctask = session->cmds[itt];
715 printk(KERN_INFO "iscsi: dropping ctask with "
716 "itt 0x%x\n", ctask->itt);
718 return ISCSI_ERR_NO_SCSI_CMD;
721 if (ctask->sc->SCp.phase != session->age) {
722 printk(KERN_ERR "iscsi: ctask's session age %d, "
723 "expected %d\n", ctask->sc->SCp.phase,
725 return ISCSI_ERR_SESSION_FAILED;
732 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
734 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
736 struct iscsi_session *session = conn->session;
739 spin_lock_irqsave(&session->lock, flags);
740 if (session->state == ISCSI_STATE_FAILED) {
741 spin_unlock_irqrestore(&session->lock, flags);
745 if (conn->stop_stage == 0)
746 session->state = ISCSI_STATE_FAILED;
747 spin_unlock_irqrestore(&session->lock, flags);
748 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
749 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
750 iscsi_conn_error(conn->cls_conn, err);
752 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
754 static void iscsi_prep_mtask(struct iscsi_conn *conn,
755 struct iscsi_mgmt_task *mtask)
757 struct iscsi_session *session = conn->session;
758 struct iscsi_hdr *hdr = mtask->hdr;
759 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
761 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
762 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
763 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
765 * pre-format CmdSN for outgoing PDU.
767 nop->cmdsn = cpu_to_be32(session->cmdsn);
768 if (hdr->itt != RESERVED_ITT) {
769 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
771 * TODO: We always use immediate, so we never hit this.
772 * If we start to send tmfs or nops as non-immediate then
773 * we should start checking the cmdsn numbers for mgmt tasks.
775 if (conn->c_stage == ISCSI_CONN_STARTED &&
776 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
777 session->queued_cmdsn++;
782 if (session->tt->init_mgmt_task)
783 session->tt->init_mgmt_task(conn, mtask);
785 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
786 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
790 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
792 struct iscsi_hdr *hdr = conn->mtask->hdr;
795 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
796 conn->session->state = ISCSI_STATE_LOGGING_OUT;
797 spin_unlock_bh(&conn->session->lock);
799 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
800 spin_lock_bh(&conn->session->lock);
804 /* done with this in-progress mtask */
809 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
811 struct iscsi_session *session = conn->session;
814 * Check for iSCSI window and take care of CmdSN wrap-around
816 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
817 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
818 "CmdSN %u/%u\n", session->exp_cmdsn,
819 session->max_cmdsn, session->cmdsn,
820 session->queued_cmdsn);
826 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
828 struct iscsi_cmd_task *ctask = conn->ctask;
831 __iscsi_get_ctask(ctask);
832 spin_unlock_bh(&conn->session->lock);
833 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
834 spin_lock_bh(&conn->session->lock);
835 __iscsi_put_ctask(ctask);
837 /* done with this ctask */
843 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
844 * @ctask: ctask to requeue
846 * LLDs that need to run a ctask from the session workqueue should call
847 * this. The session lock must be held.
849 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
851 struct iscsi_conn *conn = ctask->conn;
853 list_move_tail(&ctask->running, &conn->requeue);
854 scsi_queue_work(conn->session->host, &conn->xmitwork);
856 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
859 * iscsi_data_xmit - xmit any command into the scheduled connection
860 * @conn: iscsi connection
863 * The function can return -EAGAIN in which case the caller must
864 * re-schedule it again later or recover. '0' return code means
867 static int iscsi_data_xmit(struct iscsi_conn *conn)
871 spin_lock_bh(&conn->session->lock);
872 if (unlikely(conn->suspend_tx)) {
873 debug_scsi("conn %d Tx suspended!\n", conn->id);
874 spin_unlock_bh(&conn->session->lock);
879 rc = iscsi_xmit_ctask(conn);
885 rc = iscsi_xmit_mtask(conn);
891 * process mgmt pdus like nops before commands since we should
892 * only have one nop-out as a ping from us and targets should not
893 * overflow us with nop-ins
896 while (!list_empty(&conn->mgmtqueue)) {
897 conn->mtask = list_entry(conn->mgmtqueue.next,
898 struct iscsi_mgmt_task, running);
899 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
900 iscsi_free_mgmt_task(conn, conn->mtask);
905 iscsi_prep_mtask(conn, conn->mtask);
906 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
907 rc = iscsi_xmit_mtask(conn);
912 /* process pending command queue */
913 while (!list_empty(&conn->xmitqueue)) {
914 if (conn->tmf_state == TMF_QUEUED)
917 conn->ctask = list_entry(conn->xmitqueue.next,
918 struct iscsi_cmd_task, running);
919 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
920 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
923 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
924 fail_command(conn, conn->ctask, DID_ABORT << 16);
927 conn->session->tt->init_cmd_task(conn->ctask);
928 conn->ctask->state = ISCSI_TASK_RUNNING;
929 list_move_tail(conn->xmitqueue.next, &conn->run_list);
930 rc = iscsi_xmit_ctask(conn);
934 * we could continuously get new ctask requests so
935 * we need to check the mgmt queue for nops that need to
936 * be sent to aviod starvation
938 if (!list_empty(&conn->mgmtqueue))
942 while (!list_empty(&conn->requeue)) {
943 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
947 * we always do fastlogout - conn stop code will clean up.
949 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
952 conn->ctask = list_entry(conn->requeue.next,
953 struct iscsi_cmd_task, running);
954 conn->ctask->state = ISCSI_TASK_RUNNING;
955 list_move_tail(conn->requeue.next, &conn->run_list);
956 rc = iscsi_xmit_ctask(conn);
959 if (!list_empty(&conn->mgmtqueue))
962 spin_unlock_bh(&conn->session->lock);
966 if (unlikely(conn->suspend_tx))
968 spin_unlock_bh(&conn->session->lock);
972 static void iscsi_xmitworker(struct work_struct *work)
974 struct iscsi_conn *conn =
975 container_of(work, struct iscsi_conn, xmitwork);
978 * serialize Xmit worker on a per-connection basis.
981 rc = iscsi_data_xmit(conn);
982 } while (rc >= 0 || rc == -EAGAIN);
986 FAILURE_BAD_HOST = 1,
987 FAILURE_SESSION_FAILED,
988 FAILURE_SESSION_FREED,
989 FAILURE_WINDOW_CLOSED,
991 FAILURE_SESSION_TERMINATE,
992 FAILURE_SESSION_IN_RECOVERY,
993 FAILURE_SESSION_RECOVERY_TIMEOUT,
994 FAILURE_SESSION_LOGGING_OUT,
997 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
999 struct Scsi_Host *host;
1001 struct iscsi_session *session;
1002 struct iscsi_conn *conn;
1003 struct iscsi_cmd_task *ctask = NULL;
1005 sc->scsi_done = done;
1009 host = sc->device->host;
1010 session = iscsi_hostdata(host->hostdata);
1012 spin_lock(&session->lock);
1015 * ISCSI_STATE_FAILED is a temp. state. The recovery
1016 * code will decide what is best to do with command queued
1019 if (session->state != ISCSI_STATE_LOGGED_IN &&
1020 session->state != ISCSI_STATE_FAILED) {
1022 * to handle the race between when we set the recovery state
1023 * and block the session we requeue here (commands could
1024 * be entering our queuecommand while a block is starting
1025 * up because the block code is not locked)
1027 switch (session->state) {
1028 case ISCSI_STATE_IN_RECOVERY:
1029 reason = FAILURE_SESSION_IN_RECOVERY;
1031 case ISCSI_STATE_LOGGING_OUT:
1032 reason = FAILURE_SESSION_LOGGING_OUT;
1034 case ISCSI_STATE_RECOVERY_FAILED:
1035 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1037 case ISCSI_STATE_TERMINATE:
1038 reason = FAILURE_SESSION_TERMINATE;
1041 reason = FAILURE_SESSION_FREED;
1046 conn = session->leadconn;
1048 reason = FAILURE_SESSION_FREED;
1052 if (iscsi_check_cmdsn_window_closed(conn)) {
1053 reason = FAILURE_WINDOW_CLOSED;
1057 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1059 reason = FAILURE_OOM;
1062 session->queued_cmdsn++;
1064 sc->SCp.phase = session->age;
1065 sc->SCp.ptr = (char *)ctask;
1067 atomic_set(&ctask->refcount, 1);
1068 ctask->state = ISCSI_TASK_PENDING;
1071 INIT_LIST_HEAD(&ctask->running);
1073 list_add_tail(&ctask->running, &conn->xmitqueue);
1074 spin_unlock(&session->lock);
1076 scsi_queue_work(host, &conn->xmitwork);
1080 spin_unlock(&session->lock);
1081 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1082 return SCSI_MLQUEUE_HOST_BUSY;
1085 spin_unlock(&session->lock);
1086 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
1087 sc->cmnd[0], reason);
1088 sc->result = (DID_NO_CONNECT << 16);
1089 scsi_set_resid(sc, scsi_bufflen(sc));
1093 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1095 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1097 if (depth > ISCSI_MAX_CMD_PER_LUN)
1098 depth = ISCSI_MAX_CMD_PER_LUN;
1099 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1100 return sdev->queue_depth;
1102 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1104 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1106 struct iscsi_session *session = class_to_transport_session(cls_session);
1108 spin_lock_bh(&session->lock);
1109 if (session->state != ISCSI_STATE_LOGGED_IN) {
1110 session->state = ISCSI_STATE_RECOVERY_FAILED;
1111 if (session->leadconn)
1112 wake_up(&session->leadconn->ehwait);
1114 spin_unlock_bh(&session->lock);
1116 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1118 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1120 struct Scsi_Host *host = sc->device->host;
1121 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1122 struct iscsi_conn *conn = session->leadconn;
1124 mutex_lock(&session->eh_mutex);
1125 spin_lock_bh(&session->lock);
1126 if (session->state == ISCSI_STATE_TERMINATE) {
1128 debug_scsi("failing host reset: session terminated "
1129 "[CID %d age %d]\n", conn->id, session->age);
1130 spin_unlock_bh(&session->lock);
1131 mutex_unlock(&session->eh_mutex);
1135 spin_unlock_bh(&session->lock);
1136 mutex_unlock(&session->eh_mutex);
1138 * we drop the lock here but the leadconn cannot be destoyed while
1139 * we are in the scsi eh
1141 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1143 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1144 wait_event_interruptible(conn->ehwait,
1145 session->state == ISCSI_STATE_TERMINATE ||
1146 session->state == ISCSI_STATE_LOGGED_IN ||
1147 session->state == ISCSI_STATE_RECOVERY_FAILED);
1148 if (signal_pending(current))
1149 flush_signals(current);
1151 mutex_lock(&session->eh_mutex);
1152 spin_lock_bh(&session->lock);
1153 if (session->state == ISCSI_STATE_LOGGED_IN)
1154 printk(KERN_INFO "iscsi: host reset succeeded\n");
1157 spin_unlock_bh(&session->lock);
1158 mutex_unlock(&session->eh_mutex);
1161 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1163 static void iscsi_tmf_timedout(unsigned long data)
1165 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1166 struct iscsi_session *session = conn->session;
1168 spin_lock(&session->lock);
1169 if (conn->tmf_state == TMF_QUEUED) {
1170 conn->tmf_state = TMF_TIMEDOUT;
1171 debug_scsi("tmf timedout\n");
1172 /* unblock eh_abort() */
1173 wake_up(&conn->ehwait);
1175 spin_unlock(&session->lock);
1178 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1179 struct iscsi_tm *hdr, int age,
1182 struct iscsi_session *session = conn->session;
1183 struct iscsi_mgmt_task *mtask;
1185 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1188 spin_unlock_bh(&session->lock);
1189 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1190 spin_lock_bh(&session->lock);
1191 debug_scsi("tmf exec failure\n");
1194 conn->tmfcmd_pdus_cnt++;
1195 conn->tmf_timer.expires = timeout * HZ + jiffies;
1196 conn->tmf_timer.function = iscsi_tmf_timedout;
1197 conn->tmf_timer.data = (unsigned long)conn;
1198 add_timer(&conn->tmf_timer);
1199 debug_scsi("tmf set timeout\n");
1201 spin_unlock_bh(&session->lock);
1202 mutex_unlock(&session->eh_mutex);
1203 scsi_queue_work(session->host, &conn->xmitwork);
1206 * block eh thread until:
1210 * 3) session is terminated or restarted or userspace has
1211 * given up on recovery
1213 wait_event_interruptible(conn->ehwait, age != session->age ||
1214 session->state != ISCSI_STATE_LOGGED_IN ||
1215 conn->tmf_state != TMF_QUEUED);
1216 if (signal_pending(current))
1217 flush_signals(current);
1218 del_timer_sync(&conn->tmf_timer);
1220 mutex_lock(&session->eh_mutex);
1221 spin_lock_bh(&session->lock);
1222 /* if the session drops it will clean up the mtask */
1223 if (age != session->age ||
1224 session->state != ISCSI_STATE_LOGGED_IN)
1230 * Fail commands. session lock held and recv side suspended and xmit
1233 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1235 struct iscsi_cmd_task *ctask, *tmp;
1237 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1241 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1242 if (lun == ctask->sc->device->lun || lun == -1) {
1243 debug_scsi("failing pending sc %p itt 0x%x\n",
1244 ctask->sc, ctask->itt);
1245 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1249 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1250 if (lun == ctask->sc->device->lun || lun == -1) {
1251 debug_scsi("failing requeued sc %p itt 0x%x\n",
1252 ctask->sc, ctask->itt);
1253 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1257 /* fail all other running */
1258 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1259 if (lun == ctask->sc->device->lun || lun == -1) {
1260 debug_scsi("failing in progress sc %p itt 0x%x\n",
1261 ctask->sc, ctask->itt);
1262 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1267 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1269 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1270 scsi_flush_work(conn->session->host);
1273 static void iscsi_start_tx(struct iscsi_conn *conn)
1275 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1276 scsi_queue_work(conn->session->host, &conn->xmitwork);
1279 static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1281 struct iscsi_cls_session *cls_session;
1282 struct iscsi_session *session;
1283 struct iscsi_conn *conn;
1284 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1286 cls_session = starget_to_session(scsi_target(scmd->device));
1287 session = class_to_transport_session(cls_session);
1289 debug_scsi("scsi cmd %p timedout\n", scmd);
1291 spin_lock(&session->lock);
1292 if (session->state != ISCSI_STATE_LOGGED_IN) {
1294 * We are probably in the middle of iscsi recovery so let
1295 * that complete and handle the error.
1297 rc = EH_RESET_TIMER;
1301 conn = session->leadconn;
1303 /* In the middle of shuting down */
1304 rc = EH_RESET_TIMER;
1308 if (!conn->recv_timeout && !conn->ping_timeout)
1311 * if the ping timedout then we are in the middle of cleaning up
1312 * and can let the iscsi eh handle it
1314 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1315 (conn->ping_timeout * HZ), jiffies))
1316 rc = EH_RESET_TIMER;
1318 * if we are about to check the transport then give the command
1321 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1323 rc = EH_RESET_TIMER;
1324 /* if in the middle of checking the transport then give us more time */
1325 if (conn->ping_mtask)
1326 rc = EH_RESET_TIMER;
1328 spin_unlock(&session->lock);
1329 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1333 static void iscsi_check_transport_timeouts(unsigned long data)
1335 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1336 struct iscsi_session *session = conn->session;
1337 unsigned long timeout, next_timeout = 0, last_recv;
1339 spin_lock(&session->lock);
1340 if (session->state != ISCSI_STATE_LOGGED_IN)
1343 timeout = conn->recv_timeout;
1348 last_recv = conn->last_recv;
1349 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1351 printk(KERN_ERR "ping timeout of %d secs expired, "
1352 "last rx %lu, last ping %lu, now %lu\n",
1353 conn->ping_timeout, last_recv,
1354 conn->last_ping, jiffies);
1355 spin_unlock(&session->lock);
1356 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1360 if (time_before_eq(last_recv + timeout, jiffies)) {
1361 if (time_before_eq(conn->last_ping, last_recv)) {
1362 /* send a ping to try to provoke some traffic */
1363 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1364 iscsi_send_nopout(conn, NULL);
1366 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1368 next_timeout = last_recv + timeout;
1372 debug_scsi("Setting next tmo %lu\n", next_timeout);
1373 mod_timer(&conn->transport_timer, next_timeout);
1376 spin_unlock(&session->lock);
1379 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1380 struct iscsi_tm *hdr)
1382 memset(hdr, 0, sizeof(*hdr));
1383 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1384 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1385 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1386 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1387 hdr->rtt = ctask->hdr->itt;
1388 hdr->refcmdsn = ctask->hdr->cmdsn;
1391 int iscsi_eh_abort(struct scsi_cmnd *sc)
1393 struct Scsi_Host *host = sc->device->host;
1394 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1395 struct iscsi_conn *conn;
1396 struct iscsi_cmd_task *ctask;
1397 struct iscsi_tm *hdr;
1400 mutex_lock(&session->eh_mutex);
1401 spin_lock_bh(&session->lock);
1403 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1407 debug_scsi("sc never reached iscsi layer or it completed.\n");
1408 spin_unlock_bh(&session->lock);
1409 mutex_unlock(&session->eh_mutex);
1414 * If we are not logged in or we have started a new session
1415 * then let the host reset code handle this
1417 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1418 sc->SCp.phase != session->age) {
1419 spin_unlock_bh(&session->lock);
1420 mutex_unlock(&session->eh_mutex);
1424 conn = session->leadconn;
1425 conn->eh_abort_cnt++;
1428 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1429 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1431 /* ctask completed before time out */
1433 debug_scsi("sc completed while abort in progress\n");
1437 if (ctask->state == ISCSI_TASK_PENDING) {
1438 fail_command(conn, ctask, DID_ABORT << 16);
1442 /* only have one tmf outstanding at a time */
1443 if (conn->tmf_state != TMF_INITIAL)
1445 conn->tmf_state = TMF_QUEUED;
1448 iscsi_prep_abort_task_pdu(ctask, hdr);
1450 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1455 switch (conn->tmf_state) {
1457 spin_unlock_bh(&session->lock);
1458 iscsi_suspend_tx(conn);
1460 * clean up task if aborted. grab the recv lock as a writer
1462 write_lock_bh(conn->recv_lock);
1463 spin_lock(&session->lock);
1464 fail_command(conn, ctask, DID_ABORT << 16);
1465 conn->tmf_state = TMF_INITIAL;
1466 spin_unlock(&session->lock);
1467 write_unlock_bh(conn->recv_lock);
1468 iscsi_start_tx(conn);
1469 goto success_unlocked;
1471 spin_unlock_bh(&session->lock);
1472 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1473 goto failed_unlocked;
1476 conn->tmf_state = TMF_INITIAL;
1477 /* ctask completed before tmf abort response */
1478 debug_scsi("sc completed while abort in progress\n");
1483 conn->tmf_state = TMF_INITIAL;
1488 spin_unlock_bh(&session->lock);
1490 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1491 mutex_unlock(&session->eh_mutex);
1495 spin_unlock_bh(&session->lock);
1497 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1498 ctask ? ctask->itt : 0);
1499 mutex_unlock(&session->eh_mutex);
1502 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1504 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1506 memset(hdr, 0, sizeof(*hdr));
1507 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1508 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1509 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1510 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1511 hdr->rtt = RESERVED_ITT;
1514 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1516 struct Scsi_Host *host = sc->device->host;
1517 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1518 struct iscsi_conn *conn;
1519 struct iscsi_tm *hdr;
1522 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1524 mutex_lock(&session->eh_mutex);
1525 spin_lock_bh(&session->lock);
1527 * Just check if we are not logged in. We cannot check for
1528 * the phase because the reset could come from a ioctl.
1530 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1532 conn = session->leadconn;
1534 /* only have one tmf outstanding at a time */
1535 if (conn->tmf_state != TMF_INITIAL)
1537 conn->tmf_state = TMF_QUEUED;
1540 iscsi_prep_lun_reset_pdu(sc, hdr);
1542 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1543 session->lu_reset_timeout)) {
1548 switch (conn->tmf_state) {
1552 spin_unlock_bh(&session->lock);
1553 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1556 conn->tmf_state = TMF_INITIAL;
1561 spin_unlock_bh(&session->lock);
1563 iscsi_suspend_tx(conn);
1564 /* need to grab the recv lock then session lock */
1565 write_lock_bh(conn->recv_lock);
1566 spin_lock(&session->lock);
1567 fail_all_commands(conn, sc->device->lun);
1568 conn->tmf_state = TMF_INITIAL;
1569 spin_unlock(&session->lock);
1570 write_unlock_bh(conn->recv_lock);
1572 iscsi_start_tx(conn);
1576 spin_unlock_bh(&session->lock);
1578 debug_scsi("iscsi_eh_device_reset %s\n",
1579 rc == SUCCESS ? "SUCCESS" : "FAILED");
1580 mutex_unlock(&session->eh_mutex);
1583 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1586 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1587 * should be accessed via kfifo_{get,put} on q->queue.
1588 * Optionally, the caller can obtain the array of object pointers
1589 * by passing in a non-NULL @items pointer
1592 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1594 int i, num_arrays = 1;
1596 memset(q, 0, sizeof(*q));
1600 /* If the user passed an items pointer, he wants a copy of
1604 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1605 if (q->pool == NULL)
1608 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1610 if (q->queue == ERR_PTR(-ENOMEM))
1613 for (i = 0; i < max; i++) {
1614 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
1615 if (q->pool[i] == NULL) {
1619 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1623 *items = q->pool + max;
1624 memcpy(*items, q->pool, max * sizeof(void *));
1633 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1635 void iscsi_pool_free(struct iscsi_pool *q)
1639 for (i = 0; i < q->max; i++)
1644 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1647 * iSCSI Session's hostdata organization:
1649 * *------------------* <== hostdata_session(host->hostdata)
1650 * | ptr to class sess|
1651 * |------------------| <== iscsi_hostdata(host->hostdata)
1653 * *------------------*
1656 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1657 _sz % sizeof(unsigned long))
1659 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1662 * iscsi_session_setup - create iscsi cls session and host and session
1663 * @scsit: scsi transport template
1664 * @iscsit: iscsi transport template
1665 * @cmds_max: scsi host can queue
1666 * @qdepth: scsi host cmds per lun
1667 * @cmd_task_size: LLD ctask private data size
1668 * @mgmt_task_size: LLD mtask private data size
1669 * @initial_cmdsn: initial CmdSN
1670 * @hostno: host no allocated
1672 * This can be used by software iscsi_transports that allocate
1673 * a session per scsi host.
1675 struct iscsi_cls_session *
1676 iscsi_session_setup(struct iscsi_transport *iscsit,
1677 struct scsi_transport_template *scsit,
1678 uint16_t cmds_max, uint16_t qdepth,
1679 int cmd_task_size, int mgmt_task_size,
1680 uint32_t initial_cmdsn, uint32_t *hostno)
1682 struct Scsi_Host *shost;
1683 struct iscsi_session *session;
1684 struct iscsi_cls_session *cls_session;
1687 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1689 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1690 "Queue depth must be between 1 and %d.\n",
1691 qdepth, ISCSI_MAX_CMD_PER_LUN);
1692 qdepth = ISCSI_DEF_CMD_PER_LUN;
1695 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1696 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1698 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1699 "can_queue must be a power of 2 and between "
1700 "2 and %d - setting to %d.\n", cmds_max,
1701 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1702 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1705 shost = scsi_host_alloc(iscsit->host_template,
1706 hostdata_privsize(sizeof(*session)));
1710 /* the iscsi layer takes one task for reserve */
1711 shost->can_queue = cmds_max - 1;
1712 shost->cmd_per_lun = qdepth;
1714 shost->max_channel = 0;
1715 shost->max_lun = iscsit->max_lun;
1716 shost->max_cmd_len = iscsit->max_cmd_len;
1717 shost->transportt = scsit;
1718 shost->transportt->create_work_queue = 1;
1719 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1720 *hostno = shost->host_no;
1722 session = iscsi_hostdata(shost->hostdata);
1723 memset(session, 0, sizeof(struct iscsi_session));
1724 session->host = shost;
1725 session->state = ISCSI_STATE_FREE;
1726 session->fast_abort = 1;
1727 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1728 session->cmds_max = cmds_max;
1729 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1730 session->exp_cmdsn = initial_cmdsn + 1;
1731 session->max_cmdsn = initial_cmdsn + 1;
1732 session->max_r2t = 1;
1733 session->tt = iscsit;
1734 mutex_init(&session->eh_mutex);
1736 /* initialize SCSI PDU commands pool */
1737 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1738 (void***)&session->cmds,
1739 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1740 goto cmdpool_alloc_fail;
1742 /* pre-format cmds pool with ITT */
1743 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1744 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1747 ctask->dd_data = &ctask[1];
1749 INIT_LIST_HEAD(&ctask->running);
1752 spin_lock_init(&session->lock);
1754 /* initialize immediate command pool */
1755 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1756 (void***)&session->mgmt_cmds,
1757 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1758 goto mgmtpool_alloc_fail;
1761 /* pre-format immediate cmds pool with ITT */
1762 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1763 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1766 mtask->dd_data = &mtask[1];
1767 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1768 INIT_LIST_HEAD(&mtask->running);
1771 if (scsi_add_host(shost, NULL))
1774 if (!try_module_get(iscsit->owner))
1775 goto cls_session_fail;
1777 cls_session = iscsi_create_session(shost, iscsit, 0);
1780 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1785 module_put(iscsit->owner);
1787 scsi_remove_host(shost);
1789 iscsi_pool_free(&session->mgmtpool);
1790 mgmtpool_alloc_fail:
1791 iscsi_pool_free(&session->cmdpool);
1793 scsi_host_put(shost);
1796 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1799 * iscsi_session_teardown - destroy session, host, and cls_session
1802 * This can be used by software iscsi_transports that allocate
1803 * a session per scsi host.
1805 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1807 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1808 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1809 struct module *owner = cls_session->transport->owner;
1811 iscsi_remove_session(cls_session);
1812 scsi_remove_host(shost);
1814 iscsi_pool_free(&session->mgmtpool);
1815 iscsi_pool_free(&session->cmdpool);
1817 kfree(session->password);
1818 kfree(session->password_in);
1819 kfree(session->username);
1820 kfree(session->username_in);
1821 kfree(session->targetname);
1822 kfree(session->netdev);
1823 kfree(session->hwaddress);
1824 kfree(session->initiatorname);
1826 iscsi_free_session(cls_session);
1827 scsi_host_put(shost);
1830 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1833 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1834 * @cls_session: iscsi_cls_session
1837 struct iscsi_cls_conn *
1838 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1840 struct iscsi_session *session = class_to_transport_session(cls_session);
1841 struct iscsi_conn *conn;
1842 struct iscsi_cls_conn *cls_conn;
1845 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1848 conn = cls_conn->dd_data;
1849 memset(conn, 0, sizeof(*conn));
1851 conn->session = session;
1852 conn->cls_conn = cls_conn;
1853 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1854 conn->id = conn_idx;
1855 conn->exp_statsn = 0;
1856 conn->tmf_state = TMF_INITIAL;
1858 init_timer(&conn->transport_timer);
1859 conn->transport_timer.data = (unsigned long)conn;
1860 conn->transport_timer.function = iscsi_check_transport_timeouts;
1862 INIT_LIST_HEAD(&conn->run_list);
1863 INIT_LIST_HEAD(&conn->mgmt_run_list);
1864 INIT_LIST_HEAD(&conn->mgmtqueue);
1865 INIT_LIST_HEAD(&conn->xmitqueue);
1866 INIT_LIST_HEAD(&conn->requeue);
1867 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1869 /* allocate login_mtask used for the login/text sequences */
1870 spin_lock_bh(&session->lock);
1871 if (!__kfifo_get(session->mgmtpool.queue,
1872 (void*)&conn->login_mtask,
1874 spin_unlock_bh(&session->lock);
1875 goto login_mtask_alloc_fail;
1877 spin_unlock_bh(&session->lock);
1879 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1881 goto login_mtask_data_alloc_fail;
1882 conn->login_mtask->data = conn->data = data;
1884 init_timer(&conn->tmf_timer);
1885 init_waitqueue_head(&conn->ehwait);
1889 login_mtask_data_alloc_fail:
1890 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1892 login_mtask_alloc_fail:
1893 iscsi_destroy_conn(cls_conn);
1896 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1899 * iscsi_conn_teardown - teardown iscsi connection
1900 * cls_conn: iscsi class connection
1902 * TODO: we may need to make this into a two step process
1903 * like scsi-mls remove + put host
1905 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1907 struct iscsi_conn *conn = cls_conn->dd_data;
1908 struct iscsi_session *session = conn->session;
1909 unsigned long flags;
1911 del_timer_sync(&conn->transport_timer);
1913 spin_lock_bh(&session->lock);
1914 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1915 if (session->leadconn == conn) {
1917 * leading connection? then give up on recovery.
1919 session->state = ISCSI_STATE_TERMINATE;
1920 wake_up(&conn->ehwait);
1922 spin_unlock_bh(&session->lock);
1925 * Block until all in-progress commands for this connection
1929 spin_lock_irqsave(session->host->host_lock, flags);
1930 if (!session->host->host_busy) { /* OK for ERL == 0 */
1931 spin_unlock_irqrestore(session->host->host_lock, flags);
1934 spin_unlock_irqrestore(session->host->host_lock, flags);
1935 msleep_interruptible(500);
1936 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1937 "host_failed %d\n", session->host->host_busy,
1938 session->host->host_failed);
1940 * force eh_abort() to unblock
1942 wake_up(&conn->ehwait);
1945 /* flush queued up work because we free the connection below */
1946 iscsi_suspend_tx(conn);
1948 spin_lock_bh(&session->lock);
1950 kfree(conn->persistent_address);
1951 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1953 if (session->leadconn == conn)
1954 session->leadconn = NULL;
1955 spin_unlock_bh(&session->lock);
1957 iscsi_destroy_conn(cls_conn);
1959 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1961 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1963 struct iscsi_conn *conn = cls_conn->dd_data;
1964 struct iscsi_session *session = conn->session;
1967 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1971 if ((session->imm_data_en || !session->initial_r2t_en) &&
1972 session->first_burst > session->max_burst) {
1973 printk("iscsi: invalid burst lengths: "
1974 "first_burst %d max_burst %d\n",
1975 session->first_burst, session->max_burst);
1979 if (conn->ping_timeout && !conn->recv_timeout) {
1980 printk(KERN_ERR "iscsi: invalid recv timeout of zero "
1981 "Using 5 seconds\n.");
1982 conn->recv_timeout = 5;
1985 if (conn->recv_timeout && !conn->ping_timeout) {
1986 printk(KERN_ERR "iscsi: invalid ping timeout of zero "
1987 "Using 5 seconds.\n");
1988 conn->ping_timeout = 5;
1991 spin_lock_bh(&session->lock);
1992 conn->c_stage = ISCSI_CONN_STARTED;
1993 session->state = ISCSI_STATE_LOGGED_IN;
1994 session->queued_cmdsn = session->cmdsn;
1996 conn->last_recv = jiffies;
1997 conn->last_ping = jiffies;
1998 if (conn->recv_timeout && conn->ping_timeout)
1999 mod_timer(&conn->transport_timer,
2000 jiffies + (conn->recv_timeout * HZ));
2002 switch(conn->stop_stage) {
2003 case STOP_CONN_RECOVER:
2005 * unblock eh_abort() if it is blocked. re-try all
2006 * commands after successful recovery
2008 conn->stop_stage = 0;
2009 conn->tmf_state = TMF_INITIAL;
2011 spin_unlock_bh(&session->lock);
2013 iscsi_unblock_session(session_to_cls(session));
2014 wake_up(&conn->ehwait);
2016 case STOP_CONN_TERM:
2017 conn->stop_stage = 0;
2022 spin_unlock_bh(&session->lock);
2026 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2029 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2031 struct iscsi_mgmt_task *mtask, *tmp;
2033 /* handle pending */
2034 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2035 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
2036 iscsi_free_mgmt_task(conn, mtask);
2039 /* handle running */
2040 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2041 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
2042 iscsi_free_mgmt_task(conn, mtask);
2048 static void iscsi_start_session_recovery(struct iscsi_session *session,
2049 struct iscsi_conn *conn, int flag)
2053 del_timer_sync(&conn->transport_timer);
2055 mutex_lock(&session->eh_mutex);
2056 spin_lock_bh(&session->lock);
2057 if (conn->stop_stage == STOP_CONN_TERM) {
2058 spin_unlock_bh(&session->lock);
2059 mutex_unlock(&session->eh_mutex);
2064 * The LLD either freed/unset the lock on us, or userspace called
2065 * stop but did not create a proper connection (connection was never
2066 * bound or it was unbound then stop was called).
2068 if (!conn->recv_lock) {
2069 spin_unlock_bh(&session->lock);
2070 mutex_unlock(&session->eh_mutex);
2075 * When this is called for the in_login state, we only want to clean
2076 * up the login task and connection. We do not need to block and set
2077 * the recovery state again
2079 if (flag == STOP_CONN_TERM)
2080 session->state = ISCSI_STATE_TERMINATE;
2081 else if (conn->stop_stage != STOP_CONN_RECOVER)
2082 session->state = ISCSI_STATE_IN_RECOVERY;
2084 old_stop_stage = conn->stop_stage;
2085 conn->stop_stage = flag;
2086 conn->c_stage = ISCSI_CONN_STOPPED;
2087 spin_unlock_bh(&session->lock);
2089 iscsi_suspend_tx(conn);
2091 write_lock_bh(conn->recv_lock);
2092 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2093 write_unlock_bh(conn->recv_lock);
2096 * for connection level recovery we should not calculate
2097 * header digest. conn->hdr_size used for optimization
2098 * in hdr_extract() and will be re-negotiated at
2101 if (flag == STOP_CONN_RECOVER) {
2102 conn->hdrdgst_en = 0;
2103 conn->datadgst_en = 0;
2104 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2105 old_stop_stage != STOP_CONN_RECOVER) {
2106 debug_scsi("blocking session\n");
2107 iscsi_block_session(session_to_cls(session));
2114 spin_lock_bh(&session->lock);
2115 fail_all_commands(conn, -1);
2116 flush_control_queues(session, conn);
2117 spin_unlock_bh(&session->lock);
2118 mutex_unlock(&session->eh_mutex);
2121 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2123 struct iscsi_conn *conn = cls_conn->dd_data;
2124 struct iscsi_session *session = conn->session;
2127 case STOP_CONN_RECOVER:
2128 case STOP_CONN_TERM:
2129 iscsi_start_session_recovery(session, conn, flag);
2132 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
2135 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2137 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2138 struct iscsi_cls_conn *cls_conn, int is_leading)
2140 struct iscsi_session *session = class_to_transport_session(cls_session);
2141 struct iscsi_conn *conn = cls_conn->dd_data;
2143 spin_lock_bh(&session->lock);
2145 session->leadconn = conn;
2146 spin_unlock_bh(&session->lock);
2149 * Unblock xmitworker(), Login Phase will pass through.
2151 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2152 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2155 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2158 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2159 enum iscsi_param param, char *buf, int buflen)
2161 struct iscsi_conn *conn = cls_conn->dd_data;
2162 struct iscsi_session *session = conn->session;
2166 case ISCSI_PARAM_FAST_ABORT:
2167 sscanf(buf, "%d", &session->fast_abort);
2169 case ISCSI_PARAM_ABORT_TMO:
2170 sscanf(buf, "%d", &session->abort_timeout);
2172 case ISCSI_PARAM_LU_RESET_TMO:
2173 sscanf(buf, "%d", &session->lu_reset_timeout);
2175 case ISCSI_PARAM_PING_TMO:
2176 sscanf(buf, "%d", &conn->ping_timeout);
2178 case ISCSI_PARAM_RECV_TMO:
2179 sscanf(buf, "%d", &conn->recv_timeout);
2181 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2182 sscanf(buf, "%d", &conn->max_recv_dlength);
2184 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2185 sscanf(buf, "%d", &conn->max_xmit_dlength);
2187 case ISCSI_PARAM_HDRDGST_EN:
2188 sscanf(buf, "%d", &conn->hdrdgst_en);
2190 case ISCSI_PARAM_DATADGST_EN:
2191 sscanf(buf, "%d", &conn->datadgst_en);
2193 case ISCSI_PARAM_INITIAL_R2T_EN:
2194 sscanf(buf, "%d", &session->initial_r2t_en);
2196 case ISCSI_PARAM_MAX_R2T:
2197 sscanf(buf, "%d", &session->max_r2t);
2199 case ISCSI_PARAM_IMM_DATA_EN:
2200 sscanf(buf, "%d", &session->imm_data_en);
2202 case ISCSI_PARAM_FIRST_BURST:
2203 sscanf(buf, "%d", &session->first_burst);
2205 case ISCSI_PARAM_MAX_BURST:
2206 sscanf(buf, "%d", &session->max_burst);
2208 case ISCSI_PARAM_PDU_INORDER_EN:
2209 sscanf(buf, "%d", &session->pdu_inorder_en);
2211 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2212 sscanf(buf, "%d", &session->dataseq_inorder_en);
2214 case ISCSI_PARAM_ERL:
2215 sscanf(buf, "%d", &session->erl);
2217 case ISCSI_PARAM_IFMARKER_EN:
2218 sscanf(buf, "%d", &value);
2221 case ISCSI_PARAM_OFMARKER_EN:
2222 sscanf(buf, "%d", &value);
2225 case ISCSI_PARAM_EXP_STATSN:
2226 sscanf(buf, "%u", &conn->exp_statsn);
2228 case ISCSI_PARAM_USERNAME:
2229 kfree(session->username);
2230 session->username = kstrdup(buf, GFP_KERNEL);
2231 if (!session->username)
2234 case ISCSI_PARAM_USERNAME_IN:
2235 kfree(session->username_in);
2236 session->username_in = kstrdup(buf, GFP_KERNEL);
2237 if (!session->username_in)
2240 case ISCSI_PARAM_PASSWORD:
2241 kfree(session->password);
2242 session->password = kstrdup(buf, GFP_KERNEL);
2243 if (!session->password)
2246 case ISCSI_PARAM_PASSWORD_IN:
2247 kfree(session->password_in);
2248 session->password_in = kstrdup(buf, GFP_KERNEL);
2249 if (!session->password_in)
2252 case ISCSI_PARAM_TARGET_NAME:
2253 /* this should not change between logins */
2254 if (session->targetname)
2257 session->targetname = kstrdup(buf, GFP_KERNEL);
2258 if (!session->targetname)
2261 case ISCSI_PARAM_TPGT:
2262 sscanf(buf, "%d", &session->tpgt);
2264 case ISCSI_PARAM_PERSISTENT_PORT:
2265 sscanf(buf, "%d", &conn->persistent_port);
2267 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2269 * this is the address returned in discovery so it should
2270 * not change between logins.
2272 if (conn->persistent_address)
2275 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2276 if (!conn->persistent_address)
2285 EXPORT_SYMBOL_GPL(iscsi_set_param);
2287 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2288 enum iscsi_param param, char *buf)
2290 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2291 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2295 case ISCSI_PARAM_FAST_ABORT:
2296 len = sprintf(buf, "%d\n", session->fast_abort);
2298 case ISCSI_PARAM_ABORT_TMO:
2299 len = sprintf(buf, "%d\n", session->abort_timeout);
2301 case ISCSI_PARAM_LU_RESET_TMO:
2302 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2304 case ISCSI_PARAM_INITIAL_R2T_EN:
2305 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2307 case ISCSI_PARAM_MAX_R2T:
2308 len = sprintf(buf, "%hu\n", session->max_r2t);
2310 case ISCSI_PARAM_IMM_DATA_EN:
2311 len = sprintf(buf, "%d\n", session->imm_data_en);
2313 case ISCSI_PARAM_FIRST_BURST:
2314 len = sprintf(buf, "%u\n", session->first_burst);
2316 case ISCSI_PARAM_MAX_BURST:
2317 len = sprintf(buf, "%u\n", session->max_burst);
2319 case ISCSI_PARAM_PDU_INORDER_EN:
2320 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2322 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2323 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2325 case ISCSI_PARAM_ERL:
2326 len = sprintf(buf, "%d\n", session->erl);
2328 case ISCSI_PARAM_TARGET_NAME:
2329 len = sprintf(buf, "%s\n", session->targetname);
2331 case ISCSI_PARAM_TPGT:
2332 len = sprintf(buf, "%d\n", session->tpgt);
2334 case ISCSI_PARAM_USERNAME:
2335 len = sprintf(buf, "%s\n", session->username);
2337 case ISCSI_PARAM_USERNAME_IN:
2338 len = sprintf(buf, "%s\n", session->username_in);
2340 case ISCSI_PARAM_PASSWORD:
2341 len = sprintf(buf, "%s\n", session->password);
2343 case ISCSI_PARAM_PASSWORD_IN:
2344 len = sprintf(buf, "%s\n", session->password_in);
2352 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2354 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2355 enum iscsi_param param, char *buf)
2357 struct iscsi_conn *conn = cls_conn->dd_data;
2361 case ISCSI_PARAM_PING_TMO:
2362 len = sprintf(buf, "%u\n", conn->ping_timeout);
2364 case ISCSI_PARAM_RECV_TMO:
2365 len = sprintf(buf, "%u\n", conn->recv_timeout);
2367 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2368 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2370 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2371 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2373 case ISCSI_PARAM_HDRDGST_EN:
2374 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2376 case ISCSI_PARAM_DATADGST_EN:
2377 len = sprintf(buf, "%d\n", conn->datadgst_en);
2379 case ISCSI_PARAM_IFMARKER_EN:
2380 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2382 case ISCSI_PARAM_OFMARKER_EN:
2383 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2385 case ISCSI_PARAM_EXP_STATSN:
2386 len = sprintf(buf, "%u\n", conn->exp_statsn);
2388 case ISCSI_PARAM_PERSISTENT_PORT:
2389 len = sprintf(buf, "%d\n", conn->persistent_port);
2391 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2392 len = sprintf(buf, "%s\n", conn->persistent_address);
2400 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2402 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2405 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2409 case ISCSI_HOST_PARAM_NETDEV_NAME:
2410 if (!session->netdev)
2411 len = sprintf(buf, "%s\n", "default");
2413 len = sprintf(buf, "%s\n", session->netdev);
2415 case ISCSI_HOST_PARAM_HWADDRESS:
2416 if (!session->hwaddress)
2417 len = sprintf(buf, "%s\n", "default");
2419 len = sprintf(buf, "%s\n", session->hwaddress);
2421 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2422 if (!session->initiatorname)
2423 len = sprintf(buf, "%s\n", "unknown");
2425 len = sprintf(buf, "%s\n", session->initiatorname);
2434 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2436 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2437 char *buf, int buflen)
2439 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2442 case ISCSI_HOST_PARAM_NETDEV_NAME:
2443 if (!session->netdev)
2444 session->netdev = kstrdup(buf, GFP_KERNEL);
2446 case ISCSI_HOST_PARAM_HWADDRESS:
2447 if (!session->hwaddress)
2448 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2450 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2451 if (!session->initiatorname)
2452 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2460 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2462 MODULE_AUTHOR("Mike Christie");
2463 MODULE_DESCRIPTION("iSCSI library functions");
2464 MODULE_LICENSE("GPL");