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 __kfifo_len(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);
126 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
127 * @ctask: iscsi cmd task
129 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
130 * fields like dlength or final based on how much data it sends
132 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
134 struct iscsi_conn *conn = ctask->conn;
135 struct iscsi_session *session = conn->session;
136 struct iscsi_cmd *hdr = ctask->hdr;
137 struct scsi_cmnd *sc = ctask->sc;
139 hdr->opcode = ISCSI_OP_SCSI_CMD;
140 hdr->flags = ISCSI_ATTR_SIMPLE;
141 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
142 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
143 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
144 hdr->cmdsn = cpu_to_be32(session->cmdsn);
146 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
147 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
148 if (sc->cmd_len < MAX_COMMAND_SIZE)
149 memset(&hdr->cdb[sc->cmd_len], 0,
150 MAX_COMMAND_SIZE - sc->cmd_len);
152 ctask->data_count = 0;
153 ctask->imm_count = 0;
154 if (sc->sc_data_direction == DMA_TO_DEVICE) {
155 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
159 * imm_count bytes to be sent right after
162 * unsol_count bytes(as Data-Out) to be sent
163 * without R2T ack right after
166 * r2t_data_count bytes to be sent via R2T ack's
168 * pad_count bytes to be sent as zero-padding
170 ctask->unsol_count = 0;
171 ctask->unsol_offset = 0;
172 ctask->unsol_datasn = 0;
174 if (session->imm_data_en) {
175 if (scsi_bufflen(sc) >= session->first_burst)
176 ctask->imm_count = min(session->first_burst,
177 conn->max_xmit_dlength);
179 ctask->imm_count = min(scsi_bufflen(sc),
180 conn->max_xmit_dlength);
181 hton24(ctask->hdr->dlength, ctask->imm_count);
183 zero_data(ctask->hdr->dlength);
185 if (!session->initial_r2t_en) {
186 ctask->unsol_count = min((session->first_burst),
187 (scsi_bufflen(sc))) - ctask->imm_count;
188 ctask->unsol_offset = ctask->imm_count;
191 if (!ctask->unsol_count)
192 /* No unsolicit Data-Out's */
193 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
195 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
196 zero_data(hdr->dlength);
198 if (sc->sc_data_direction == DMA_FROM_DEVICE)
199 hdr->flags |= ISCSI_FLAG_CMD_READ;
202 conn->scsicmd_pdus_cnt++;
204 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
205 "cmdsn %d win %d]\n",
206 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
207 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
208 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
212 * iscsi_complete_command - return command back to scsi-ml
213 * @ctask: iscsi cmd task
215 * Must be called with session lock.
216 * This function returns the scsi command to scsi-ml and returns
217 * the cmd task to the pool of available cmd tasks.
219 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
221 struct iscsi_session *session = ctask->conn->session;
222 struct scsi_cmnd *sc = ctask->sc;
224 ctask->state = ISCSI_TASK_COMPLETED;
226 /* SCSI eh reuses commands to verify us */
228 list_del_init(&ctask->running);
229 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
233 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
235 atomic_inc(&ctask->refcount);
238 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
240 if (atomic_dec_and_test(&ctask->refcount))
241 iscsi_complete_command(ctask);
245 * iscsi_cmd_rsp - SCSI Command Response processing
246 * @conn: iscsi connection
248 * @ctask: scsi command task
249 * @data: cmd data buffer
250 * @datalen: len of buffer
252 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
253 * then completes the command and task.
255 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
256 struct iscsi_cmd_task *ctask, char *data,
259 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
260 struct iscsi_session *session = conn->session;
261 struct scsi_cmnd *sc = ctask->sc;
263 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
264 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
266 sc->result = (DID_OK << 16) | rhdr->cmd_status;
268 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
269 sc->result = DID_ERROR << 16;
273 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
278 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
279 "invalid data buffer size of %d\n", datalen);
280 sc->result = DID_BAD_TARGET << 16;
284 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
285 if (datalen < senselen)
286 goto invalid_datalen;
288 memcpy(sc->sense_buffer, data + 2,
289 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
290 debug_scsi("copied %d bytes of sense\n",
291 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
294 if (sc->sc_data_direction == DMA_TO_DEVICE)
297 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
298 int res_count = be32_to_cpu(rhdr->residual_count);
300 if (res_count > 0 && res_count <= scsi_bufflen(sc))
301 scsi_set_resid(sc, res_count);
303 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
304 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
305 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
306 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
307 scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
310 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
311 (long)sc, sc->result, ctask->itt);
312 conn->scsirsp_pdus_cnt++;
314 __iscsi_put_ctask(ctask);
317 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
319 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
321 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
322 conn->tmfrsp_pdus_cnt++;
324 if (conn->tmabort_state != TMABORT_INITIAL)
327 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
328 conn->tmabort_state = TMABORT_SUCCESS;
329 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
330 conn->tmabort_state = TMABORT_NOT_FOUND;
332 conn->tmabort_state = TMABORT_FAILED;
333 wake_up(&conn->ehwait);
336 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
337 char *data, int datalen)
339 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
340 struct iscsi_hdr rejected_pdu;
343 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
345 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
346 if (ntoh24(reject->dlength) > datalen)
347 return ISCSI_ERR_PROTO;
349 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
350 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
351 itt = get_itt(rejected_pdu.itt);
352 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
353 "due to DataDigest error.\n", itt,
354 rejected_pdu.opcode);
361 * __iscsi_complete_pdu - complete pdu
365 * @datalen: len of data buffer
367 * Completes pdu processing by freeing any resources allocated at
368 * queuecommand or send generic. session lock must be held and verify
369 * itt must have been called.
371 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
372 char *data, int datalen)
374 struct iscsi_session *session = conn->session;
375 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
376 struct iscsi_cmd_task *ctask;
377 struct iscsi_mgmt_task *mtask;
380 if (hdr->itt != RESERVED_ITT)
381 itt = get_itt(hdr->itt);
385 if (itt < session->cmds_max) {
386 ctask = session->cmds[itt];
388 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
389 opcode, conn->id, ctask->itt, datalen);
392 case ISCSI_OP_SCSI_CMD_RSP:
393 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
394 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
397 case ISCSI_OP_SCSI_DATA_IN:
398 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
399 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
400 conn->scsirsp_pdus_cnt++;
401 __iscsi_put_ctask(ctask);
405 /* LLD handles this for now */
408 rc = ISCSI_ERR_BAD_OPCODE;
411 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
412 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
413 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
415 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
416 opcode, conn->id, mtask->itt, datalen);
418 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
420 case ISCSI_OP_LOGOUT_RSP:
422 rc = ISCSI_ERR_PROTO;
425 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
427 case ISCSI_OP_LOGIN_RSP:
428 case ISCSI_OP_TEXT_RSP:
430 * login related PDU's exp_statsn is handled in
433 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
434 rc = ISCSI_ERR_CONN_FAILED;
435 list_del(&mtask->running);
436 if (conn->login_mtask != mtask)
437 __kfifo_put(session->mgmtpool.queue,
438 (void*)&mtask, sizeof(void*));
440 case ISCSI_OP_SCSI_TMFUNC_RSP:
442 rc = ISCSI_ERR_PROTO;
446 iscsi_tmf_rsp(conn, hdr);
448 case ISCSI_OP_NOOP_IN:
449 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
450 rc = ISCSI_ERR_PROTO;
453 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
455 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
456 rc = ISCSI_ERR_CONN_FAILED;
457 list_del(&mtask->running);
458 if (conn->login_mtask != mtask)
459 __kfifo_put(session->mgmtpool.queue,
460 (void*)&mtask, sizeof(void*));
463 rc = ISCSI_ERR_BAD_OPCODE;
466 } else if (itt == ~0U) {
467 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
470 case ISCSI_OP_NOOP_IN:
472 rc = ISCSI_ERR_PROTO;
476 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
479 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
480 rc = ISCSI_ERR_CONN_FAILED;
482 case ISCSI_OP_REJECT:
483 rc = iscsi_handle_reject(conn, hdr, data, datalen);
485 case ISCSI_OP_ASYNC_EVENT:
486 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
487 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
488 rc = ISCSI_ERR_CONN_FAILED;
491 rc = ISCSI_ERR_BAD_OPCODE;
495 rc = ISCSI_ERR_BAD_ITT;
499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
501 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
502 char *data, int datalen)
506 spin_lock(&conn->session->lock);
507 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
508 spin_unlock(&conn->session->lock);
511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
513 /* verify itt (itt encoding: age+cid+itt) */
514 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
517 struct iscsi_session *session = conn->session;
518 struct iscsi_cmd_task *ctask;
521 if (hdr->itt != RESERVED_ITT) {
522 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
523 (session->age << ISCSI_AGE_SHIFT)) {
524 printk(KERN_ERR "iscsi: received itt %x expected "
525 "session age (%x)\n", (__force u32)hdr->itt,
526 session->age & ISCSI_AGE_MASK);
527 return ISCSI_ERR_BAD_ITT;
530 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
531 (conn->id << ISCSI_CID_SHIFT)) {
532 printk(KERN_ERR "iscsi: received itt %x, expected "
533 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
534 return ISCSI_ERR_BAD_ITT;
536 itt = get_itt(hdr->itt);
540 if (itt < session->cmds_max) {
541 ctask = session->cmds[itt];
544 printk(KERN_INFO "iscsi: dropping ctask with "
545 "itt 0x%x\n", ctask->itt);
547 return ISCSI_ERR_NO_SCSI_CMD;
550 if (ctask->sc->SCp.phase != session->age) {
551 printk(KERN_ERR "iscsi: ctask's session age %d, "
552 "expected %d\n", ctask->sc->SCp.phase,
554 return ISCSI_ERR_SESSION_FAILED;
561 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
563 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
565 struct iscsi_session *session = conn->session;
568 spin_lock_irqsave(&session->lock, flags);
569 if (session->state == ISCSI_STATE_FAILED) {
570 spin_unlock_irqrestore(&session->lock, flags);
574 if (conn->stop_stage == 0)
575 session->state = ISCSI_STATE_FAILED;
576 spin_unlock_irqrestore(&session->lock, flags);
577 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
578 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
579 iscsi_conn_error(conn->cls_conn, err);
581 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
583 static void iscsi_prep_mtask(struct iscsi_conn *conn,
584 struct iscsi_mgmt_task *mtask)
586 struct iscsi_session *session = conn->session;
587 struct iscsi_hdr *hdr = mtask->hdr;
588 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
590 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
591 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
592 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
594 * pre-format CmdSN for outgoing PDU.
596 nop->cmdsn = cpu_to_be32(session->cmdsn);
597 if (hdr->itt != RESERVED_ITT) {
598 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
600 * TODO: We always use immediate, so we never hit this.
601 * If we start to send tmfs or nops as non-immediate then
602 * we should start checking the cmdsn numbers for mgmt tasks.
604 if (conn->c_stage == ISCSI_CONN_STARTED &&
605 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
606 session->queued_cmdsn++;
611 if (session->tt->init_mgmt_task)
612 session->tt->init_mgmt_task(conn, mtask);
614 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
615 hdr->opcode, hdr->itt, mtask->data_count);
618 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
620 struct iscsi_hdr *hdr = conn->mtask->hdr;
621 int rc, was_logout = 0;
623 spin_unlock_bh(&conn->session->lock);
624 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
625 conn->session->state = ISCSI_STATE_IN_RECOVERY;
626 iscsi_block_session(session_to_cls(conn->session));
629 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
630 spin_lock_bh(&conn->session->lock);
634 /* done with this in-progress mtask */
638 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
644 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
646 struct iscsi_session *session = conn->session;
649 * Check for iSCSI window and take care of CmdSN wrap-around
651 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
652 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
653 "CmdSN %u/%u\n", session->exp_cmdsn,
654 session->max_cmdsn, session->cmdsn,
655 session->queued_cmdsn);
661 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
663 struct iscsi_cmd_task *ctask = conn->ctask;
667 * serialize with TMF AbortTask
669 if (ctask->state == ISCSI_TASK_ABORTING)
672 __iscsi_get_ctask(ctask);
673 spin_unlock_bh(&conn->session->lock);
674 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
675 spin_lock_bh(&conn->session->lock);
676 __iscsi_put_ctask(ctask);
680 /* done with this ctask */
686 * iscsi_data_xmit - xmit any command into the scheduled connection
687 * @conn: iscsi connection
690 * The function can return -EAGAIN in which case the caller must
691 * re-schedule it again later or recover. '0' return code means
694 static int iscsi_data_xmit(struct iscsi_conn *conn)
698 spin_lock_bh(&conn->session->lock);
699 if (unlikely(conn->suspend_tx)) {
700 debug_scsi("conn %d Tx suspended!\n", conn->id);
701 spin_unlock_bh(&conn->session->lock);
706 rc = iscsi_xmit_ctask(conn);
712 rc = iscsi_xmit_mtask(conn);
718 * process mgmt pdus like nops before commands since we should
719 * only have one nop-out as a ping from us and targets should not
720 * overflow us with nop-ins
723 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
725 iscsi_prep_mtask(conn, conn->mtask);
726 list_add_tail(&conn->mtask->running, &conn->mgmt_run_list);
727 rc = iscsi_xmit_mtask(conn);
732 /* process command queue */
733 while (!list_empty(&conn->xmitqueue)) {
735 * iscsi tcp may readd the task to the xmitqueue to send
738 conn->ctask = list_entry(conn->xmitqueue.next,
739 struct iscsi_cmd_task, running);
740 switch (conn->ctask->state) {
741 case ISCSI_TASK_ABORTING:
743 case ISCSI_TASK_PENDING:
744 iscsi_prep_scsi_cmd_pdu(conn->ctask);
745 conn->session->tt->init_cmd_task(conn->ctask);
748 conn->ctask->state = ISCSI_TASK_RUNNING;
751 list_move_tail(conn->xmitqueue.next, &conn->run_list);
753 rc = iscsi_xmit_ctask(conn);
757 * we could continuously get new ctask requests so
758 * we need to check the mgmt queue for nops that need to
759 * be sent to aviod starvation
761 if (__kfifo_len(conn->mgmtqueue))
764 spin_unlock_bh(&conn->session->lock);
768 if (unlikely(conn->suspend_tx))
770 spin_unlock_bh(&conn->session->lock);
774 static void iscsi_xmitworker(struct work_struct *work)
776 struct iscsi_conn *conn =
777 container_of(work, struct iscsi_conn, xmitwork);
780 * serialize Xmit worker on a per-connection basis.
783 rc = iscsi_data_xmit(conn);
784 } while (rc >= 0 || rc == -EAGAIN);
788 FAILURE_BAD_HOST = 1,
789 FAILURE_SESSION_FAILED,
790 FAILURE_SESSION_FREED,
791 FAILURE_WINDOW_CLOSED,
793 FAILURE_SESSION_TERMINATE,
794 FAILURE_SESSION_IN_RECOVERY,
795 FAILURE_SESSION_RECOVERY_TIMEOUT,
798 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
800 struct Scsi_Host *host;
802 struct iscsi_session *session;
803 struct iscsi_conn *conn;
804 struct iscsi_cmd_task *ctask = NULL;
806 sc->scsi_done = done;
810 host = sc->device->host;
811 session = iscsi_hostdata(host->hostdata);
813 spin_lock(&session->lock);
816 * ISCSI_STATE_FAILED is a temp. state. The recovery
817 * code will decide what is best to do with command queued
820 if (session->state != ISCSI_STATE_LOGGED_IN &&
821 session->state != ISCSI_STATE_FAILED) {
823 * to handle the race between when we set the recovery state
824 * and block the session we requeue here (commands could
825 * be entering our queuecommand while a block is starting
826 * up because the block code is not locked)
828 if (session->state == ISCSI_STATE_IN_RECOVERY) {
829 reason = FAILURE_SESSION_IN_RECOVERY;
833 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
834 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
835 else if (session->state == ISCSI_STATE_TERMINATE)
836 reason = FAILURE_SESSION_TERMINATE;
838 reason = FAILURE_SESSION_FREED;
842 conn = session->leadconn;
844 reason = FAILURE_SESSION_FREED;
848 if (iscsi_check_cmdsn_window_closed(conn)) {
849 reason = FAILURE_WINDOW_CLOSED;
853 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
855 reason = FAILURE_OOM;
858 session->queued_cmdsn++;
860 sc->SCp.phase = session->age;
861 sc->SCp.ptr = (char *)ctask;
863 atomic_set(&ctask->refcount, 1);
864 ctask->state = ISCSI_TASK_PENDING;
868 INIT_LIST_HEAD(&ctask->running);
870 list_add_tail(&ctask->running, &conn->xmitqueue);
871 spin_unlock(&session->lock);
873 scsi_queue_work(host, &conn->xmitwork);
877 spin_unlock(&session->lock);
878 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
879 return SCSI_MLQUEUE_HOST_BUSY;
882 spin_unlock(&session->lock);
883 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
884 sc->cmnd[0], reason);
885 sc->result = (DID_NO_CONNECT << 16);
886 scsi_set_resid(sc, scsi_bufflen(sc));
890 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
892 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
894 if (depth > ISCSI_MAX_CMD_PER_LUN)
895 depth = ISCSI_MAX_CMD_PER_LUN;
896 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
897 return sdev->queue_depth;
899 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
901 static struct iscsi_mgmt_task *
902 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
903 char *data, uint32_t data_size)
905 struct iscsi_session *session = conn->session;
906 struct iscsi_mgmt_task *mtask;
908 if (session->state == ISCSI_STATE_TERMINATE)
911 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
912 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
914 * Login and Text are sent serially, in
915 * request-followed-by-response sequence.
916 * Same mtask can be used. Same ITT must be used.
917 * Note that login_mtask is preallocated at conn_create().
919 mtask = conn->login_mtask;
921 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
922 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
924 if (!__kfifo_get(session->mgmtpool.queue,
925 (void*)&mtask, sizeof(void*)))
930 memcpy(mtask->data, data, data_size);
931 mtask->data_count = data_size;
933 mtask->data_count = 0;
935 INIT_LIST_HEAD(&mtask->running);
936 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
937 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
941 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
942 char *data, uint32_t data_size)
944 struct iscsi_conn *conn = cls_conn->dd_data;
945 struct iscsi_session *session = conn->session;
948 spin_lock_bh(&session->lock);
949 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
951 spin_unlock_bh(&session->lock);
952 scsi_queue_work(session->host, &conn->xmitwork);
955 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
957 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
959 struct iscsi_session *session = class_to_transport_session(cls_session);
960 struct iscsi_conn *conn = session->leadconn;
962 spin_lock_bh(&session->lock);
963 if (session->state != ISCSI_STATE_LOGGED_IN) {
964 session->state = ISCSI_STATE_RECOVERY_FAILED;
966 wake_up(&conn->ehwait);
968 spin_unlock_bh(&session->lock);
970 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
972 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
974 struct Scsi_Host *host = sc->device->host;
975 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
976 struct iscsi_conn *conn = session->leadconn;
977 int fail_session = 0;
979 spin_lock_bh(&session->lock);
980 if (session->state == ISCSI_STATE_TERMINATE) {
982 debug_scsi("failing host reset: session terminated "
983 "[CID %d age %d]\n", conn->id, session->age);
984 spin_unlock_bh(&session->lock);
988 if (sc->SCp.phase == session->age) {
989 debug_scsi("failing connection CID %d due to SCSI host reset\n",
993 spin_unlock_bh(&session->lock);
996 * we drop the lock here but the leadconn cannot be destoyed while
997 * we are in the scsi eh
1000 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1002 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1003 wait_event_interruptible(conn->ehwait,
1004 session->state == ISCSI_STATE_TERMINATE ||
1005 session->state == ISCSI_STATE_LOGGED_IN ||
1006 session->state == ISCSI_STATE_RECOVERY_FAILED);
1007 if (signal_pending(current))
1008 flush_signals(current);
1010 spin_lock_bh(&session->lock);
1011 if (session->state == ISCSI_STATE_LOGGED_IN)
1012 printk(KERN_INFO "iscsi: host reset succeeded\n");
1015 spin_unlock_bh(&session->lock);
1019 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1021 static void iscsi_tmabort_timedout(unsigned long data)
1023 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1024 struct iscsi_conn *conn = ctask->conn;
1025 struct iscsi_session *session = conn->session;
1027 spin_lock(&session->lock);
1028 if (conn->tmabort_state == TMABORT_INITIAL) {
1029 conn->tmabort_state = TMABORT_TIMEDOUT;
1030 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1031 ctask->sc, ctask->itt);
1032 /* unblock eh_abort() */
1033 wake_up(&conn->ehwait);
1035 spin_unlock(&session->lock);
1038 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1039 struct iscsi_cmd_task *ctask)
1041 struct iscsi_conn *conn = ctask->conn;
1042 struct iscsi_session *session = conn->session;
1043 struct iscsi_tm *hdr = &conn->tmhdr;
1046 * ctask timed out but session is OK requests must be serialized.
1048 memset(hdr, 0, sizeof(struct iscsi_tm));
1049 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1050 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1051 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1052 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1053 hdr->rtt = ctask->hdr->itt;
1054 hdr->refcmdsn = ctask->hdr->cmdsn;
1056 ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1058 if (!ctask->mtask) {
1059 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1060 debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt);
1063 ctask->state = ISCSI_TASK_ABORTING;
1065 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1067 if (conn->tmabort_state == TMABORT_INITIAL) {
1068 conn->tmfcmd_pdus_cnt++;
1069 conn->tmabort_timer.expires = 20*HZ + jiffies;
1070 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1071 conn->tmabort_timer.data = (unsigned long)ctask;
1072 add_timer(&conn->tmabort_timer);
1073 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1075 spin_unlock_bh(&session->lock);
1076 scsi_queue_work(session->host, &conn->xmitwork);
1079 * block eh thread until:
1083 * 3) session is terminated or restarted or userspace has
1084 * given up on recovery
1086 wait_event_interruptible(conn->ehwait,
1087 sc->SCp.phase != session->age ||
1088 session->state != ISCSI_STATE_LOGGED_IN ||
1089 conn->tmabort_state != TMABORT_INITIAL);
1090 if (signal_pending(current))
1091 flush_signals(current);
1092 del_timer_sync(&conn->tmabort_timer);
1093 spin_lock_bh(&session->lock);
1098 * session lock must be held
1100 static struct iscsi_mgmt_task *
1101 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1103 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1104 struct iscsi_mgmt_task *task;
1106 debug_scsi("searching %d tasks\n", nr_tasks);
1108 for (i = 0; i < nr_tasks; i++) {
1109 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1110 debug_scsi("check task %u\n", task->itt);
1112 if (task->itt == itt) {
1113 debug_scsi("matched task\n");
1117 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1122 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1124 struct iscsi_conn *conn = ctask->conn;
1125 struct iscsi_session *session = conn->session;
1130 if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt))
1131 list_del(&ctask->mtask->running);
1132 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1134 ctask->mtask = NULL;
1139 * session lock must be held
1141 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1144 struct scsi_cmnd *sc;
1150 if (ctask->state == ISCSI_TASK_PENDING)
1152 * cmd never made it to the xmit thread, so we should not count
1153 * the cmd in the sequencing
1155 conn->session->queued_cmdsn--;
1157 conn->session->tt->cleanup_cmd_task(conn, ctask);
1158 iscsi_ctask_mtask_cleanup(ctask);
1161 scsi_set_resid(sc, scsi_bufflen(sc));
1162 if (conn->ctask == ctask)
1164 /* release ref from queuecommand */
1165 __iscsi_put_ctask(ctask);
1168 int iscsi_eh_abort(struct scsi_cmnd *sc)
1170 struct iscsi_cmd_task *ctask;
1171 struct iscsi_conn *conn;
1172 struct iscsi_session *session;
1176 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1180 debug_scsi("sc never reached iscsi layer or it completed.\n");
1184 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1186 session = conn->session;
1188 conn->eh_abort_cnt++;
1189 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1191 spin_lock_bh(&session->lock);
1194 * If we are not logged in or we have started a new session
1195 * then let the host reset code handle this
1197 if (session->state != ISCSI_STATE_LOGGED_IN ||
1198 sc->SCp.phase != session->age)
1201 /* ctask completed before time out */
1203 debug_scsi("sc completed while abort in progress\n");
1207 /* what should we do here ? */
1208 if (conn->ctask == ctask) {
1209 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1210 "Failing abort\n", sc, ctask->itt);
1214 if (ctask->state == ISCSI_TASK_PENDING) {
1215 fail_command(conn, ctask, DID_ABORT << 16);
1219 conn->tmabort_state = TMABORT_INITIAL;
1220 rc = iscsi_exec_abort_task(sc, ctask);
1221 if (rc || sc->SCp.phase != session->age ||
1222 session->state != ISCSI_STATE_LOGGED_IN)
1224 iscsi_ctask_mtask_cleanup(ctask);
1226 switch (conn->tmabort_state) {
1227 case TMABORT_SUCCESS:
1228 spin_unlock_bh(&session->lock);
1230 * clean up task if aborted. grab the recv lock as a writer
1232 write_lock_bh(conn->recv_lock);
1233 spin_lock(&session->lock);
1234 fail_command(conn, ctask, DID_ABORT << 16);
1235 spin_unlock(&session->lock);
1236 write_unlock_bh(conn->recv_lock);
1238 * make sure xmit thread is not still touching the
1241 scsi_flush_work(session->host);
1242 goto success_unlocked;
1243 case TMABORT_NOT_FOUND:
1245 /* ctask completed before tmf abort response */
1246 debug_scsi("sc completed while abort in progress\n");
1251 /* timedout or failed */
1252 spin_unlock_bh(&session->lock);
1253 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1254 goto failed_unlocked;
1258 spin_unlock_bh(&session->lock);
1260 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1264 spin_unlock_bh(&session->lock);
1266 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1269 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1272 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1276 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1281 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1282 if (q->pool == NULL) {
1287 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1289 if (q->queue == ERR_PTR(-ENOMEM)) {
1295 for (i = 0; i < max; i++) {
1296 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1297 if (q->pool[i] == NULL) {
1300 for (j = 0; j < i; j++)
1303 kfifo_free(q->queue);
1308 memset(q->pool[i], 0, item_size);
1309 (*items)[i] = q->pool[i];
1310 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1314 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1316 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1320 for (i = 0; i < q->max; i++)
1325 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1328 * iSCSI Session's hostdata organization:
1330 * *------------------* <== hostdata_session(host->hostdata)
1331 * | ptr to class sess|
1332 * |------------------| <== iscsi_hostdata(host->hostdata)
1334 * *------------------*
1337 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1338 _sz % sizeof(unsigned long))
1340 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1343 * iscsi_session_setup - create iscsi cls session and host and session
1344 * @scsit: scsi transport template
1345 * @iscsit: iscsi transport template
1346 * @cmds_max: scsi host can queue
1347 * @qdepth: scsi host cmds per lun
1348 * @cmd_task_size: LLD ctask private data size
1349 * @mgmt_task_size: LLD mtask private data size
1350 * @initial_cmdsn: initial CmdSN
1351 * @hostno: host no allocated
1353 * This can be used by software iscsi_transports that allocate
1354 * a session per scsi host.
1356 struct iscsi_cls_session *
1357 iscsi_session_setup(struct iscsi_transport *iscsit,
1358 struct scsi_transport_template *scsit,
1359 uint16_t cmds_max, uint16_t qdepth,
1360 int cmd_task_size, int mgmt_task_size,
1361 uint32_t initial_cmdsn, uint32_t *hostno)
1363 struct Scsi_Host *shost;
1364 struct iscsi_session *session;
1365 struct iscsi_cls_session *cls_session;
1368 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1370 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1371 "Queue depth must be between 1 and %d.\n",
1372 qdepth, ISCSI_MAX_CMD_PER_LUN);
1373 qdepth = ISCSI_DEF_CMD_PER_LUN;
1376 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1377 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1379 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1380 "can_queue must be a power of 2 and between "
1381 "2 and %d - setting to %d.\n", cmds_max,
1382 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1383 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1386 shost = scsi_host_alloc(iscsit->host_template,
1387 hostdata_privsize(sizeof(*session)));
1391 /* the iscsi layer takes one task for reserve */
1392 shost->can_queue = cmds_max - 1;
1393 shost->cmd_per_lun = qdepth;
1395 shost->max_channel = 0;
1396 shost->max_lun = iscsit->max_lun;
1397 shost->max_cmd_len = iscsit->max_cmd_len;
1398 shost->transportt = scsit;
1399 shost->transportt->create_work_queue = 1;
1400 *hostno = shost->host_no;
1402 session = iscsi_hostdata(shost->hostdata);
1403 memset(session, 0, sizeof(struct iscsi_session));
1404 session->host = shost;
1405 session->state = ISCSI_STATE_FREE;
1406 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1407 session->cmds_max = cmds_max;
1408 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1409 session->exp_cmdsn = initial_cmdsn + 1;
1410 session->max_cmdsn = initial_cmdsn + 1;
1411 session->max_r2t = 1;
1412 session->tt = iscsit;
1414 /* initialize SCSI PDU commands pool */
1415 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1416 (void***)&session->cmds,
1417 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1418 goto cmdpool_alloc_fail;
1420 /* pre-format cmds pool with ITT */
1421 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1422 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1425 ctask->dd_data = &ctask[1];
1427 INIT_LIST_HEAD(&ctask->running);
1430 spin_lock_init(&session->lock);
1432 /* initialize immediate command pool */
1433 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1434 (void***)&session->mgmt_cmds,
1435 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1436 goto mgmtpool_alloc_fail;
1439 /* pre-format immediate cmds pool with ITT */
1440 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1441 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1444 mtask->dd_data = &mtask[1];
1445 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1446 INIT_LIST_HEAD(&mtask->running);
1449 if (scsi_add_host(shost, NULL))
1452 if (!try_module_get(iscsit->owner))
1453 goto cls_session_fail;
1455 cls_session = iscsi_create_session(shost, iscsit, 0);
1458 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1463 module_put(iscsit->owner);
1465 scsi_remove_host(shost);
1467 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1468 mgmtpool_alloc_fail:
1469 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1471 scsi_host_put(shost);
1474 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1477 * iscsi_session_teardown - destroy session, host, and cls_session
1480 * This can be used by software iscsi_transports that allocate
1481 * a session per scsi host.
1483 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1485 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1486 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1487 struct module *owner = cls_session->transport->owner;
1489 iscsi_unblock_session(cls_session);
1490 scsi_remove_host(shost);
1492 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1493 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1495 kfree(session->password);
1496 kfree(session->password_in);
1497 kfree(session->username);
1498 kfree(session->username_in);
1499 kfree(session->targetname);
1500 kfree(session->netdev);
1501 kfree(session->hwaddress);
1502 kfree(session->initiatorname);
1504 iscsi_destroy_session(cls_session);
1505 scsi_host_put(shost);
1508 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1511 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1512 * @cls_session: iscsi_cls_session
1515 struct iscsi_cls_conn *
1516 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1518 struct iscsi_session *session = class_to_transport_session(cls_session);
1519 struct iscsi_conn *conn;
1520 struct iscsi_cls_conn *cls_conn;
1523 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1526 conn = cls_conn->dd_data;
1527 memset(conn, 0, sizeof(*conn));
1529 conn->session = session;
1530 conn->cls_conn = cls_conn;
1531 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1532 conn->id = conn_idx;
1533 conn->exp_statsn = 0;
1534 conn->tmabort_state = TMABORT_INITIAL;
1535 INIT_LIST_HEAD(&conn->run_list);
1536 INIT_LIST_HEAD(&conn->mgmt_run_list);
1537 INIT_LIST_HEAD(&conn->xmitqueue);
1539 /* initialize general immediate & non-immediate PDU commands queue */
1540 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1542 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1543 goto mgmtqueue_alloc_fail;
1545 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1547 /* allocate login_mtask used for the login/text sequences */
1548 spin_lock_bh(&session->lock);
1549 if (!__kfifo_get(session->mgmtpool.queue,
1550 (void*)&conn->login_mtask,
1552 spin_unlock_bh(&session->lock);
1553 goto login_mtask_alloc_fail;
1555 spin_unlock_bh(&session->lock);
1557 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1559 goto login_mtask_data_alloc_fail;
1560 conn->login_mtask->data = conn->data = data;
1562 init_timer(&conn->tmabort_timer);
1563 init_waitqueue_head(&conn->ehwait);
1567 login_mtask_data_alloc_fail:
1568 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1570 login_mtask_alloc_fail:
1571 kfifo_free(conn->mgmtqueue);
1572 mgmtqueue_alloc_fail:
1573 iscsi_destroy_conn(cls_conn);
1576 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1579 * iscsi_conn_teardown - teardown iscsi connection
1580 * cls_conn: iscsi class connection
1582 * TODO: we may need to make this into a two step process
1583 * like scsi-mls remove + put host
1585 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1587 struct iscsi_conn *conn = cls_conn->dd_data;
1588 struct iscsi_session *session = conn->session;
1589 unsigned long flags;
1591 spin_lock_bh(&session->lock);
1592 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1593 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1594 if (session->leadconn == conn) {
1596 * leading connection? then give up on recovery.
1598 session->state = ISCSI_STATE_TERMINATE;
1599 wake_up(&conn->ehwait);
1601 spin_unlock_bh(&session->lock);
1604 * Block until all in-progress commands for this connection
1608 spin_lock_irqsave(session->host->host_lock, flags);
1609 if (!session->host->host_busy) { /* OK for ERL == 0 */
1610 spin_unlock_irqrestore(session->host->host_lock, flags);
1613 spin_unlock_irqrestore(session->host->host_lock, flags);
1614 msleep_interruptible(500);
1615 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1616 "host_failed %d\n", session->host->host_busy,
1617 session->host->host_failed);
1619 * force eh_abort() to unblock
1621 wake_up(&conn->ehwait);
1624 /* flush queued up work because we free the connection below */
1625 scsi_flush_work(session->host);
1627 spin_lock_bh(&session->lock);
1629 kfree(conn->persistent_address);
1630 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1632 if (session->leadconn == conn)
1633 session->leadconn = NULL;
1634 spin_unlock_bh(&session->lock);
1636 kfifo_free(conn->mgmtqueue);
1638 iscsi_destroy_conn(cls_conn);
1640 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1642 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1644 struct iscsi_conn *conn = cls_conn->dd_data;
1645 struct iscsi_session *session = conn->session;
1648 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1652 if ((session->imm_data_en || !session->initial_r2t_en) &&
1653 session->first_burst > session->max_burst) {
1654 printk("iscsi: invalid burst lengths: "
1655 "first_burst %d max_burst %d\n",
1656 session->first_burst, session->max_burst);
1660 spin_lock_bh(&session->lock);
1661 conn->c_stage = ISCSI_CONN_STARTED;
1662 session->state = ISCSI_STATE_LOGGED_IN;
1663 session->queued_cmdsn = session->cmdsn;
1665 switch(conn->stop_stage) {
1666 case STOP_CONN_RECOVER:
1668 * unblock eh_abort() if it is blocked. re-try all
1669 * commands after successful recovery
1671 conn->stop_stage = 0;
1672 conn->tmabort_state = TMABORT_INITIAL;
1674 spin_unlock_bh(&session->lock);
1676 iscsi_unblock_session(session_to_cls(session));
1677 wake_up(&conn->ehwait);
1679 case STOP_CONN_TERM:
1680 conn->stop_stage = 0;
1685 spin_unlock_bh(&session->lock);
1689 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1692 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1694 struct iscsi_mgmt_task *mtask, *tmp;
1696 /* handle pending */
1697 while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1698 if (mtask == conn->login_mtask)
1700 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1701 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1705 /* handle running */
1706 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1707 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1708 list_del(&mtask->running);
1710 if (mtask == conn->login_mtask)
1712 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1719 /* Fail commands. Mutex and session lock held and recv side suspended */
1720 static void fail_all_commands(struct iscsi_conn *conn)
1722 struct iscsi_cmd_task *ctask, *tmp;
1725 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1726 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1728 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1731 /* fail all other running */
1732 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1733 debug_scsi("failing in progress sc %p itt 0x%x\n",
1734 ctask->sc, ctask->itt);
1735 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1741 static void iscsi_start_session_recovery(struct iscsi_session *session,
1742 struct iscsi_conn *conn, int flag)
1746 spin_lock_bh(&session->lock);
1747 if (conn->stop_stage == STOP_CONN_TERM) {
1748 spin_unlock_bh(&session->lock);
1753 * When this is called for the in_login state, we only want to clean
1754 * up the login task and connection. We do not need to block and set
1755 * the recovery state again
1757 if (flag == STOP_CONN_TERM)
1758 session->state = ISCSI_STATE_TERMINATE;
1759 else if (conn->stop_stage != STOP_CONN_RECOVER)
1760 session->state = ISCSI_STATE_IN_RECOVERY;
1762 old_stop_stage = conn->stop_stage;
1763 conn->stop_stage = flag;
1764 conn->c_stage = ISCSI_CONN_STOPPED;
1765 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1766 spin_unlock_bh(&session->lock);
1767 scsi_flush_work(session->host);
1769 write_lock_bh(conn->recv_lock);
1770 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1771 write_unlock_bh(conn->recv_lock);
1774 * for connection level recovery we should not calculate
1775 * header digest. conn->hdr_size used for optimization
1776 * in hdr_extract() and will be re-negotiated at
1779 if (flag == STOP_CONN_RECOVER) {
1780 conn->hdrdgst_en = 0;
1781 conn->datadgst_en = 0;
1782 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1783 old_stop_stage != STOP_CONN_RECOVER) {
1784 debug_scsi("blocking session\n");
1785 iscsi_block_session(session_to_cls(session));
1792 spin_lock_bh(&session->lock);
1793 fail_all_commands(conn);
1794 flush_control_queues(session, conn);
1795 spin_unlock_bh(&session->lock);
1798 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1800 struct iscsi_conn *conn = cls_conn->dd_data;
1801 struct iscsi_session *session = conn->session;
1804 case STOP_CONN_RECOVER:
1805 case STOP_CONN_TERM:
1806 iscsi_start_session_recovery(session, conn, flag);
1809 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1812 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1814 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1815 struct iscsi_cls_conn *cls_conn, int is_leading)
1817 struct iscsi_session *session = class_to_transport_session(cls_session);
1818 struct iscsi_conn *conn = cls_conn->dd_data;
1820 spin_lock_bh(&session->lock);
1822 session->leadconn = conn;
1823 spin_unlock_bh(&session->lock);
1826 * Unblock xmitworker(), Login Phase will pass through.
1828 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1829 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1832 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1835 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1836 enum iscsi_param param, char *buf, int buflen)
1838 struct iscsi_conn *conn = cls_conn->dd_data;
1839 struct iscsi_session *session = conn->session;
1843 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1844 sscanf(buf, "%d", &conn->max_recv_dlength);
1846 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1847 sscanf(buf, "%d", &conn->max_xmit_dlength);
1849 case ISCSI_PARAM_HDRDGST_EN:
1850 sscanf(buf, "%d", &conn->hdrdgst_en);
1852 case ISCSI_PARAM_DATADGST_EN:
1853 sscanf(buf, "%d", &conn->datadgst_en);
1855 case ISCSI_PARAM_INITIAL_R2T_EN:
1856 sscanf(buf, "%d", &session->initial_r2t_en);
1858 case ISCSI_PARAM_MAX_R2T:
1859 sscanf(buf, "%d", &session->max_r2t);
1861 case ISCSI_PARAM_IMM_DATA_EN:
1862 sscanf(buf, "%d", &session->imm_data_en);
1864 case ISCSI_PARAM_FIRST_BURST:
1865 sscanf(buf, "%d", &session->first_burst);
1867 case ISCSI_PARAM_MAX_BURST:
1868 sscanf(buf, "%d", &session->max_burst);
1870 case ISCSI_PARAM_PDU_INORDER_EN:
1871 sscanf(buf, "%d", &session->pdu_inorder_en);
1873 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1874 sscanf(buf, "%d", &session->dataseq_inorder_en);
1876 case ISCSI_PARAM_ERL:
1877 sscanf(buf, "%d", &session->erl);
1879 case ISCSI_PARAM_IFMARKER_EN:
1880 sscanf(buf, "%d", &value);
1883 case ISCSI_PARAM_OFMARKER_EN:
1884 sscanf(buf, "%d", &value);
1887 case ISCSI_PARAM_EXP_STATSN:
1888 sscanf(buf, "%u", &conn->exp_statsn);
1890 case ISCSI_PARAM_USERNAME:
1891 kfree(session->username);
1892 session->username = kstrdup(buf, GFP_KERNEL);
1893 if (!session->username)
1896 case ISCSI_PARAM_USERNAME_IN:
1897 kfree(session->username_in);
1898 session->username_in = kstrdup(buf, GFP_KERNEL);
1899 if (!session->username_in)
1902 case ISCSI_PARAM_PASSWORD:
1903 kfree(session->password);
1904 session->password = kstrdup(buf, GFP_KERNEL);
1905 if (!session->password)
1908 case ISCSI_PARAM_PASSWORD_IN:
1909 kfree(session->password_in);
1910 session->password_in = kstrdup(buf, GFP_KERNEL);
1911 if (!session->password_in)
1914 case ISCSI_PARAM_TARGET_NAME:
1915 /* this should not change between logins */
1916 if (session->targetname)
1919 session->targetname = kstrdup(buf, GFP_KERNEL);
1920 if (!session->targetname)
1923 case ISCSI_PARAM_TPGT:
1924 sscanf(buf, "%d", &session->tpgt);
1926 case ISCSI_PARAM_PERSISTENT_PORT:
1927 sscanf(buf, "%d", &conn->persistent_port);
1929 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1931 * this is the address returned in discovery so it should
1932 * not change between logins.
1934 if (conn->persistent_address)
1937 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1938 if (!conn->persistent_address)
1947 EXPORT_SYMBOL_GPL(iscsi_set_param);
1949 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1950 enum iscsi_param param, char *buf)
1952 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1953 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1957 case ISCSI_PARAM_INITIAL_R2T_EN:
1958 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1960 case ISCSI_PARAM_MAX_R2T:
1961 len = sprintf(buf, "%hu\n", session->max_r2t);
1963 case ISCSI_PARAM_IMM_DATA_EN:
1964 len = sprintf(buf, "%d\n", session->imm_data_en);
1966 case ISCSI_PARAM_FIRST_BURST:
1967 len = sprintf(buf, "%u\n", session->first_burst);
1969 case ISCSI_PARAM_MAX_BURST:
1970 len = sprintf(buf, "%u\n", session->max_burst);
1972 case ISCSI_PARAM_PDU_INORDER_EN:
1973 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1975 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1976 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1978 case ISCSI_PARAM_ERL:
1979 len = sprintf(buf, "%d\n", session->erl);
1981 case ISCSI_PARAM_TARGET_NAME:
1982 len = sprintf(buf, "%s\n", session->targetname);
1984 case ISCSI_PARAM_TPGT:
1985 len = sprintf(buf, "%d\n", session->tpgt);
1987 case ISCSI_PARAM_USERNAME:
1988 len = sprintf(buf, "%s\n", session->username);
1990 case ISCSI_PARAM_USERNAME_IN:
1991 len = sprintf(buf, "%s\n", session->username_in);
1993 case ISCSI_PARAM_PASSWORD:
1994 len = sprintf(buf, "%s\n", session->password);
1996 case ISCSI_PARAM_PASSWORD_IN:
1997 len = sprintf(buf, "%s\n", session->password_in);
2005 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2007 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2008 enum iscsi_param param, char *buf)
2010 struct iscsi_conn *conn = cls_conn->dd_data;
2014 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2015 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2017 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2018 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2020 case ISCSI_PARAM_HDRDGST_EN:
2021 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2023 case ISCSI_PARAM_DATADGST_EN:
2024 len = sprintf(buf, "%d\n", conn->datadgst_en);
2026 case ISCSI_PARAM_IFMARKER_EN:
2027 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2029 case ISCSI_PARAM_OFMARKER_EN:
2030 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2032 case ISCSI_PARAM_EXP_STATSN:
2033 len = sprintf(buf, "%u\n", conn->exp_statsn);
2035 case ISCSI_PARAM_PERSISTENT_PORT:
2036 len = sprintf(buf, "%d\n", conn->persistent_port);
2038 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2039 len = sprintf(buf, "%s\n", conn->persistent_address);
2047 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2049 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2052 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2056 case ISCSI_HOST_PARAM_NETDEV_NAME:
2057 if (!session->netdev)
2058 len = sprintf(buf, "%s\n", "default");
2060 len = sprintf(buf, "%s\n", session->netdev);
2062 case ISCSI_HOST_PARAM_HWADDRESS:
2063 if (!session->hwaddress)
2064 len = sprintf(buf, "%s\n", "default");
2066 len = sprintf(buf, "%s\n", session->hwaddress);
2068 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2069 if (!session->initiatorname)
2070 len = sprintf(buf, "%s\n", "unknown");
2072 len = sprintf(buf, "%s\n", session->initiatorname);
2081 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2083 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2084 char *buf, int buflen)
2086 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2089 case ISCSI_HOST_PARAM_NETDEV_NAME:
2090 if (!session->netdev)
2091 session->netdev = kstrdup(buf, GFP_KERNEL);
2093 case ISCSI_HOST_PARAM_HWADDRESS:
2094 if (!session->hwaddress)
2095 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2097 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2098 if (!session->initiatorname)
2099 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2107 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2109 MODULE_AUTHOR("Mike Christie");
2110 MODULE_DESCRIPTION("iSCSI library functions");
2111 MODULE_LICENSE("GPL");