mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Mike Christie](/assets/img/avatar_default.png)
We can race and misset the suspend bit if iscsi_write_space is called then iscsi_send returns with a failure indicating there is no space. To handle this this patch returns a error upwards allowing xmitworker to decide if we need to try and transmit again. For the no write space case xmitworker will not retry, and instead let iscsi_write_space queue it back up if needed (this relies on the work queue code to properly requeue us if needed). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1702 lines
46 KiB
C
1702 lines
46 KiB
C
/*
|
|
* iSCSI lib functions
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
|
|
* Copyright (C) 2004 - 2006 Mike Christie
|
|
* Copyright (C) 2004 - 2005 Dmitry Yusupov
|
|
* Copyright (C) 2004 - 2005 Alex Aizman
|
|
* maintained by open-iscsi@googlegroups.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/kfifo.h>
|
|
#include <linux/delay.h>
|
|
#include <net/tcp.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_eh.h>
|
|
#include <scsi/scsi_tcq.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/iscsi_proto.h>
|
|
#include <scsi/scsi_transport.h>
|
|
#include <scsi/scsi_transport_iscsi.h>
|
|
#include <scsi/libiscsi.h>
|
|
|
|
struct iscsi_session *
|
|
class_to_transport_session(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
|
return iscsi_hostdata(shost->hostdata);
|
|
}
|
|
EXPORT_SYMBOL_GPL(class_to_transport_session);
|
|
|
|
#define INVALID_SN_DELTA 0xffff
|
|
|
|
int
|
|
iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
|
|
{
|
|
uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
|
|
uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
|
|
|
|
if (max_cmdsn < exp_cmdsn -1 &&
|
|
max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
|
|
return ISCSI_ERR_MAX_CMDSN;
|
|
if (max_cmdsn > session->max_cmdsn ||
|
|
max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
|
|
session->max_cmdsn = max_cmdsn;
|
|
if (exp_cmdsn > session->exp_cmdsn ||
|
|
exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
|
|
session->exp_cmdsn = exp_cmdsn;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
|
|
|
|
void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
|
|
struct iscsi_data *hdr,
|
|
int transport_data_cnt)
|
|
{
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
|
|
memset(hdr, 0, sizeof(struct iscsi_data));
|
|
hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
|
|
hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
|
|
ctask->unsol_datasn++;
|
|
hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
|
|
memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
|
|
|
|
hdr->itt = ctask->hdr->itt;
|
|
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
|
|
hdr->offset = cpu_to_be32(ctask->total_length -
|
|
transport_data_cnt -
|
|
ctask->unsol_count);
|
|
|
|
if (ctask->unsol_count > conn->max_xmit_dlength) {
|
|
hton24(hdr->dlength, conn->max_xmit_dlength);
|
|
ctask->data_count = conn->max_xmit_dlength;
|
|
hdr->flags = 0;
|
|
} else {
|
|
hton24(hdr->dlength, ctask->unsol_count);
|
|
ctask->data_count = ctask->unsol_count;
|
|
hdr->flags = ISCSI_FLAG_CMD_FINAL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
|
|
|
|
/**
|
|
* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
|
|
* @ctask: iscsi cmd task
|
|
*
|
|
* Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
|
|
* fields like dlength or final based on how much data it sends
|
|
*/
|
|
static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_cmd *hdr = ctask->hdr;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
hdr->opcode = ISCSI_OP_SCSI_CMD;
|
|
hdr->flags = ISCSI_ATTR_SIMPLE;
|
|
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
|
|
hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
|
|
(session->age << ISCSI_AGE_SHIFT);
|
|
hdr->data_length = cpu_to_be32(sc->request_bufflen);
|
|
hdr->cmdsn = cpu_to_be32(session->cmdsn);
|
|
session->cmdsn++;
|
|
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
|
|
memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
|
|
|
|
if (sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
hdr->flags |= ISCSI_FLAG_CMD_WRITE;
|
|
/*
|
|
* Write counters:
|
|
*
|
|
* imm_count bytes to be sent right after
|
|
* SCSI PDU Header
|
|
*
|
|
* unsol_count bytes(as Data-Out) to be sent
|
|
* without R2T ack right after
|
|
* immediate data
|
|
*
|
|
* r2t_data_count bytes to be sent via R2T ack's
|
|
*
|
|
* pad_count bytes to be sent as zero-padding
|
|
*/
|
|
ctask->imm_count = 0;
|
|
ctask->unsol_count = 0;
|
|
ctask->unsol_datasn = 0;
|
|
|
|
if (session->imm_data_en) {
|
|
if (ctask->total_length >= session->first_burst)
|
|
ctask->imm_count = min(session->first_burst,
|
|
conn->max_xmit_dlength);
|
|
else
|
|
ctask->imm_count = min(ctask->total_length,
|
|
conn->max_xmit_dlength);
|
|
hton24(ctask->hdr->dlength, ctask->imm_count);
|
|
} else
|
|
zero_data(ctask->hdr->dlength);
|
|
|
|
if (!session->initial_r2t_en)
|
|
ctask->unsol_count = min(session->first_burst,
|
|
ctask->total_length) - ctask->imm_count;
|
|
if (!ctask->unsol_count)
|
|
/* No unsolicit Data-Out's */
|
|
ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
} else {
|
|
ctask->datasn = 0;
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
zero_data(hdr->dlength);
|
|
|
|
if (sc->sc_data_direction == DMA_FROM_DEVICE)
|
|
hdr->flags |= ISCSI_FLAG_CMD_READ;
|
|
}
|
|
|
|
conn->scsicmd_pdus_cnt++;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
|
|
|
|
/**
|
|
* iscsi_complete_command - return command back to scsi-ml
|
|
* @session: iscsi session
|
|
* @ctask: iscsi cmd task
|
|
*
|
|
* Must be called with session lock.
|
|
* This function returns the scsi command to scsi-ml and returns
|
|
* the cmd task to the pool of available cmd tasks.
|
|
*/
|
|
static void iscsi_complete_command(struct iscsi_session *session,
|
|
struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
ctask->sc = NULL;
|
|
list_del_init(&ctask->running);
|
|
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
|
|
sc->scsi_done(sc);
|
|
}
|
|
|
|
/**
|
|
* iscsi_cmd_rsp - SCSI Command Response processing
|
|
* @conn: iscsi connection
|
|
* @hdr: iscsi header
|
|
* @ctask: scsi command task
|
|
* @data: cmd data buffer
|
|
* @datalen: len of buffer
|
|
*
|
|
* iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
|
|
* then completes the command and task.
|
|
**/
|
|
static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
struct iscsi_cmd_task *ctask, char *data,
|
|
int datalen)
|
|
{
|
|
int rc;
|
|
struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
|
|
struct iscsi_session *session = conn->session;
|
|
struct scsi_cmnd *sc = ctask->sc;
|
|
|
|
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
if (rc) {
|
|
sc->result = DID_ERROR << 16;
|
|
goto out;
|
|
}
|
|
|
|
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
|
|
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
|
|
if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
|
|
sc->result = DID_ERROR << 16;
|
|
goto out;
|
|
}
|
|
|
|
if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
|
|
int senselen;
|
|
|
|
if (datalen < 2) {
|
|
invalid_datalen:
|
|
printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
|
|
"invalid data buffer size of %d\n", datalen);
|
|
sc->result = DID_BAD_TARGET << 16;
|
|
goto out;
|
|
}
|
|
|
|
senselen = (data[0] << 8) | data[1];
|
|
if (datalen < senselen)
|
|
goto invalid_datalen;
|
|
|
|
memcpy(sc->sense_buffer, data + 2,
|
|
min(senselen, SCSI_SENSE_BUFFERSIZE));
|
|
debug_scsi("copied %d bytes of sense\n",
|
|
min(senselen, SCSI_SENSE_BUFFERSIZE));
|
|
}
|
|
|
|
if (sc->sc_data_direction == DMA_TO_DEVICE)
|
|
goto out;
|
|
|
|
if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
|
|
int res_count = be32_to_cpu(rhdr->residual_count);
|
|
|
|
if (res_count > 0 && res_count <= sc->request_bufflen)
|
|
sc->resid = res_count;
|
|
else
|
|
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
|
|
} else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
|
|
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
|
|
else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
|
|
sc->resid = be32_to_cpu(rhdr->residual_count);
|
|
|
|
out:
|
|
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
|
|
(long)sc, sc->result, ctask->itt);
|
|
conn->scsirsp_pdus_cnt++;
|
|
|
|
iscsi_complete_command(conn->session, ctask);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* __iscsi_complete_pdu - complete pdu
|
|
* @conn: iscsi conn
|
|
* @hdr: iscsi header
|
|
* @data: data buffer
|
|
* @datalen: len of data buffer
|
|
*
|
|
* Completes pdu processing by freeing any resources allocated at
|
|
* queuecommand or send generic. session lock must be held and verify
|
|
* itt must have been called.
|
|
*/
|
|
int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, int datalen)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
|
|
struct iscsi_cmd_task *ctask;
|
|
struct iscsi_mgmt_task *mtask;
|
|
uint32_t itt;
|
|
|
|
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG))
|
|
itt = hdr->itt & ISCSI_ITT_MASK;
|
|
else
|
|
itt = hdr->itt;
|
|
|
|
if (itt < session->cmds_max) {
|
|
ctask = session->cmds[itt];
|
|
|
|
debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
|
|
opcode, conn->id, ctask->itt, datalen);
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
|
|
rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
|
|
datalen);
|
|
break;
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
|
|
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
conn->scsirsp_pdus_cnt++;
|
|
iscsi_complete_command(session, ctask);
|
|
}
|
|
break;
|
|
case ISCSI_OP_R2T:
|
|
/* LLD handles this for now */
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
} else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
|
|
itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
|
|
mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
|
|
opcode, conn->id, mtask->itt, datalen);
|
|
|
|
rc = iscsi_check_assign_cmdsn(session,
|
|
(struct iscsi_nopin*)hdr);
|
|
if (rc)
|
|
goto done;
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_LOGOUT_RSP:
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
/* fall through */
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_TEXT_RSP:
|
|
/*
|
|
* login related PDU's exp_statsn is handled in
|
|
* userspace
|
|
*/
|
|
rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
|
|
list_del(&mtask->running);
|
|
if (conn->login_mtask != mtask)
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
(void*)&mtask, sizeof(void*));
|
|
break;
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
if (datalen) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
conn->tmfrsp_pdus_cnt++;
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
conn->tmabort_state =
|
|
((struct iscsi_tm_rsp *)hdr)->
|
|
response == ISCSI_TMF_RSP_COMPLETE ?
|
|
TMABORT_SUCCESS:TMABORT_FAILED;
|
|
/* unblock eh_abort() */
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
break;
|
|
case ISCSI_OP_NOOP_IN:
|
|
if (hdr->ttt != ISCSI_RESERVED_TAG) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
|
|
rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
|
|
list_del(&mtask->running);
|
|
if (conn->login_mtask != mtask)
|
|
__kfifo_put(session->mgmtpool.queue,
|
|
(void*)&mtask, sizeof(void*));
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
} else if (itt == ISCSI_RESERVED_TAG) {
|
|
switch(opcode) {
|
|
case ISCSI_OP_NOOP_IN:
|
|
if (!datalen) {
|
|
rc = iscsi_check_assign_cmdsn(session,
|
|
(struct iscsi_nopin*)hdr);
|
|
if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
|
|
rc = iscsi_recv_pdu(conn->cls_conn,
|
|
hdr, NULL, 0);
|
|
} else
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
case ISCSI_OP_REJECT:
|
|
/* we need sth like iscsi_reject_rsp()*/
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
/* we need sth like iscsi_async_event_rsp() */
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
} else
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
|
|
done:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
|
|
|
|
int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, int datalen)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock(&conn->session->lock);
|
|
rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
|
|
spin_unlock(&conn->session->lock);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
|
|
|
|
/* verify itt (itt encoding: age+cid+itt) */
|
|
int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
uint32_t *ret_itt)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_cmd_task *ctask;
|
|
uint32_t itt;
|
|
|
|
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
if ((hdr->itt & ISCSI_AGE_MASK) !=
|
|
(session->age << ISCSI_AGE_SHIFT)) {
|
|
printk(KERN_ERR "iscsi: received itt %x expected "
|
|
"session age (%x)\n", hdr->itt,
|
|
session->age & ISCSI_AGE_MASK);
|
|
return ISCSI_ERR_BAD_ITT;
|
|
}
|
|
|
|
if ((hdr->itt & ISCSI_CID_MASK) !=
|
|
(conn->id << ISCSI_CID_SHIFT)) {
|
|
printk(KERN_ERR "iscsi: received itt %x, expected "
|
|
"CID (%x)\n", hdr->itt, conn->id);
|
|
return ISCSI_ERR_BAD_ITT;
|
|
}
|
|
itt = hdr->itt & ISCSI_ITT_MASK;
|
|
} else
|
|
itt = hdr->itt;
|
|
|
|
if (itt < session->cmds_max) {
|
|
ctask = session->cmds[itt];
|
|
|
|
if (!ctask->sc) {
|
|
printk(KERN_INFO "iscsi: dropping ctask with "
|
|
"itt 0x%x\n", ctask->itt);
|
|
/* force drop */
|
|
return ISCSI_ERR_NO_SCSI_CMD;
|
|
}
|
|
|
|
if (ctask->sc->SCp.phase != session->age) {
|
|
printk(KERN_ERR "iscsi: ctask's session age %d, "
|
|
"expected %d\n", ctask->sc->SCp.phase,
|
|
session->age);
|
|
return ISCSI_ERR_SESSION_FAILED;
|
|
}
|
|
}
|
|
|
|
*ret_itt = itt;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_verify_itt);
|
|
|
|
void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&session->lock, flags);
|
|
if (session->state == ISCSI_STATE_FAILED) {
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
return;
|
|
}
|
|
|
|
if (conn->stop_stage == 0)
|
|
session->state = ISCSI_STATE_FAILED;
|
|
spin_unlock_irqrestore(&session->lock, flags);
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
|
|
iscsi_conn_error(conn->cls_conn, err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_failure);
|
|
|
|
/**
|
|
* iscsi_data_xmit - xmit any command into the scheduled connection
|
|
* @conn: iscsi connection
|
|
*
|
|
* Notes:
|
|
* The function can return -EAGAIN in which case the caller must
|
|
* re-schedule it again later or recover. '0' return code means
|
|
* successful xmit.
|
|
**/
|
|
static int iscsi_data_xmit(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_transport *tt;
|
|
int rc = 0;
|
|
|
|
if (unlikely(conn->suspend_tx)) {
|
|
debug_scsi("conn %d Tx suspended!\n", conn->id);
|
|
return -ENODATA;
|
|
}
|
|
tt = conn->session->tt;
|
|
|
|
/*
|
|
* Transmit in the following order:
|
|
*
|
|
* 1) un-finished xmit (ctask or mtask)
|
|
* 2) immediate control PDUs
|
|
* 3) write data
|
|
* 4) SCSI commands
|
|
* 5) non-immediate control PDUs
|
|
*
|
|
* No need to lock around __kfifo_get as long as
|
|
* there's one producer and one consumer.
|
|
*/
|
|
|
|
BUG_ON(conn->ctask && conn->mtask);
|
|
|
|
if (conn->ctask) {
|
|
rc = tt->xmit_cmd_task(conn, conn->ctask);
|
|
if (rc)
|
|
goto again;
|
|
/* done with this in-progress ctask */
|
|
conn->ctask = NULL;
|
|
}
|
|
if (conn->mtask) {
|
|
rc = tt->xmit_mgmt_task(conn, conn->mtask);
|
|
if (rc)
|
|
goto again;
|
|
/* done with this in-progress mtask */
|
|
conn->mtask = NULL;
|
|
}
|
|
|
|
/* process immediate first */
|
|
if (unlikely(__kfifo_len(conn->immqueue))) {
|
|
while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
|
|
sizeof(void*))) {
|
|
spin_lock_bh(&conn->session->lock);
|
|
list_add_tail(&conn->mtask->running,
|
|
&conn->mgmt_run_list);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
rc = tt->xmit_mgmt_task(conn, conn->mtask);
|
|
if (rc)
|
|
goto again;
|
|
}
|
|
/* done with this mtask */
|
|
conn->mtask = NULL;
|
|
}
|
|
|
|
/* process command queue */
|
|
while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
|
|
sizeof(void*))) {
|
|
/*
|
|
* iscsi tcp may readd the task to the xmitqueue to send
|
|
* write data
|
|
*/
|
|
spin_lock_bh(&conn->session->lock);
|
|
if (list_empty(&conn->ctask->running))
|
|
list_add_tail(&conn->ctask->running, &conn->run_list);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
rc = tt->xmit_cmd_task(conn, conn->ctask);
|
|
if (rc)
|
|
goto again;
|
|
}
|
|
/* done with this ctask */
|
|
conn->ctask = NULL;
|
|
|
|
/* process the rest control plane PDUs, if any */
|
|
if (unlikely(__kfifo_len(conn->mgmtqueue))) {
|
|
while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
|
|
sizeof(void*))) {
|
|
spin_lock_bh(&conn->session->lock);
|
|
list_add_tail(&conn->mtask->running,
|
|
&conn->mgmt_run_list);
|
|
spin_unlock_bh(&conn->session->lock);
|
|
rc = tt->xmit_mgmt_task(conn, conn->mtask);
|
|
if (rc)
|
|
goto again;
|
|
}
|
|
/* done with this mtask */
|
|
conn->mtask = NULL;
|
|
}
|
|
|
|
return -ENODATA;
|
|
|
|
again:
|
|
if (unlikely(conn->suspend_tx))
|
|
return -ENODATA;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void iscsi_xmitworker(void *data)
|
|
{
|
|
struct iscsi_conn *conn = data;
|
|
int rc;
|
|
/*
|
|
* serialize Xmit worker on a per-connection basis.
|
|
*/
|
|
mutex_lock(&conn->xmitmutex);
|
|
do {
|
|
rc = iscsi_data_xmit(conn);
|
|
} while (rc >= 0 || rc == -EAGAIN);
|
|
mutex_unlock(&conn->xmitmutex);
|
|
}
|
|
|
|
enum {
|
|
FAILURE_BAD_HOST = 1,
|
|
FAILURE_SESSION_FAILED,
|
|
FAILURE_SESSION_FREED,
|
|
FAILURE_WINDOW_CLOSED,
|
|
FAILURE_SESSION_TERMINATE,
|
|
FAILURE_SESSION_IN_RECOVERY,
|
|
FAILURE_SESSION_RECOVERY_TIMEOUT,
|
|
};
|
|
|
|
int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct Scsi_Host *host;
|
|
int reason = 0;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cmd_task *ctask = NULL;
|
|
|
|
sc->scsi_done = done;
|
|
sc->result = 0;
|
|
|
|
host = sc->device->host;
|
|
session = iscsi_hostdata(host->hostdata);
|
|
|
|
spin_lock(&session->lock);
|
|
|
|
/*
|
|
* ISCSI_STATE_FAILED is a temp. state. The recovery
|
|
* code will decide what is best to do with command queued
|
|
* during this time
|
|
*/
|
|
if (session->state != ISCSI_STATE_LOGGED_IN &&
|
|
session->state != ISCSI_STATE_FAILED) {
|
|
/*
|
|
* to handle the race between when we set the recovery state
|
|
* and block the session we requeue here (commands could
|
|
* be entering our queuecommand while a block is starting
|
|
* up because the block code is not locked)
|
|
*/
|
|
if (session->state == ISCSI_STATE_IN_RECOVERY) {
|
|
reason = FAILURE_SESSION_IN_RECOVERY;
|
|
goto reject;
|
|
}
|
|
|
|
if (session->state == ISCSI_STATE_RECOVERY_FAILED)
|
|
reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
|
|
else if (session->state == ISCSI_STATE_TERMINATE)
|
|
reason = FAILURE_SESSION_TERMINATE;
|
|
else
|
|
reason = FAILURE_SESSION_FREED;
|
|
goto fault;
|
|
}
|
|
|
|
/*
|
|
* Check for iSCSI window and take care of CmdSN wrap-around
|
|
*/
|
|
if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
|
|
reason = FAILURE_WINDOW_CLOSED;
|
|
goto reject;
|
|
}
|
|
|
|
conn = session->leadconn;
|
|
|
|
__kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
|
|
sc->SCp.phase = session->age;
|
|
sc->SCp.ptr = (char *)ctask;
|
|
|
|
ctask->mtask = NULL;
|
|
ctask->conn = conn;
|
|
ctask->sc = sc;
|
|
INIT_LIST_HEAD(&ctask->running);
|
|
ctask->total_length = sc->request_bufflen;
|
|
iscsi_prep_scsi_cmd_pdu(ctask);
|
|
|
|
session->tt->init_cmd_task(ctask);
|
|
|
|
__kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
|
|
debug_scsi(
|
|
"ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
|
|
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
|
|
conn->id, (long)sc, ctask->itt, sc->request_bufflen,
|
|
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
|
|
spin_unlock(&session->lock);
|
|
|
|
scsi_queue_work(host, &conn->xmitwork);
|
|
return 0;
|
|
|
|
reject:
|
|
spin_unlock(&session->lock);
|
|
debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
fault:
|
|
spin_unlock(&session->lock);
|
|
printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
|
|
sc->cmnd[0], reason);
|
|
sc->result = (DID_NO_CONNECT << 16);
|
|
sc->resid = sc->request_bufflen;
|
|
sc->scsi_done(sc);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_queuecommand);
|
|
|
|
int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
|
|
{
|
|
if (depth > ISCSI_MAX_CMD_PER_LUN)
|
|
depth = ISCSI_MAX_CMD_PER_LUN;
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
|
|
return sdev->queue_depth;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
|
|
|
|
static int
|
|
iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, uint32_t data_size)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
|
|
struct iscsi_mgmt_task *mtask;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
spin_unlock_bh(&session->lock);
|
|
return -EPERM;
|
|
}
|
|
if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
|
|
hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
|
|
/*
|
|
* Login and Text are sent serially, in
|
|
* request-followed-by-response sequence.
|
|
* Same mtask can be used. Same ITT must be used.
|
|
* Note that login_mtask is preallocated at conn_create().
|
|
*/
|
|
mtask = conn->login_mtask;
|
|
else {
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
|
|
|
|
nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
if (!__kfifo_get(session->mgmtpool.queue,
|
|
(void*)&mtask, sizeof(void*))) {
|
|
spin_unlock_bh(&session->lock);
|
|
return -ENOSPC;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pre-format CmdSN for outgoing PDU.
|
|
*/
|
|
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
|
|
(session->age << ISCSI_AGE_SHIFT);
|
|
nop->cmdsn = cpu_to_be32(session->cmdsn);
|
|
if (conn->c_stage == ISCSI_CONN_STARTED &&
|
|
!(hdr->opcode & ISCSI_OP_IMMEDIATE))
|
|
session->cmdsn++;
|
|
} else
|
|
/* do not advance CmdSN */
|
|
nop->cmdsn = cpu_to_be32(session->cmdsn);
|
|
|
|
if (data_size) {
|
|
memcpy(mtask->data, data, data_size);
|
|
mtask->data_count = data_size;
|
|
} else
|
|
mtask->data_count = 0;
|
|
|
|
INIT_LIST_HEAD(&mtask->running);
|
|
memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
|
|
if (session->tt->init_mgmt_task)
|
|
session->tt->init_mgmt_task(conn, mtask, data, data_size);
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
|
|
hdr->opcode, hdr->itt, data_size);
|
|
|
|
/*
|
|
* since send_pdu() could be called at least from two contexts,
|
|
* we need to serialize __kfifo_put, so we don't have to take
|
|
* additional lock on fast data-path
|
|
*/
|
|
if (hdr->opcode & ISCSI_OP_IMMEDIATE)
|
|
__kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
|
|
else
|
|
__kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
|
|
|
|
scsi_queue_work(session->host, &conn->xmitwork);
|
|
return 0;
|
|
}
|
|
|
|
int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
|
|
char *data, uint32_t data_size)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
int rc;
|
|
|
|
mutex_lock(&conn->xmitmutex);
|
|
rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
|
|
mutex_unlock(&conn->xmitmutex);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
|
|
|
|
void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct iscsi_session *session = class_to_transport_session(cls_session);
|
|
struct iscsi_conn *conn = session->leadconn;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
session->state = ISCSI_STATE_RECOVERY_FAILED;
|
|
if (conn)
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
|
|
|
|
int iscsi_eh_host_reset(struct scsi_cmnd *sc)
|
|
{
|
|
struct Scsi_Host *host = sc->device->host;
|
|
struct iscsi_session *session = iscsi_hostdata(host->hostdata);
|
|
struct iscsi_conn *conn = session->leadconn;
|
|
int fail_session = 0;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
failed:
|
|
debug_scsi("failing host reset: session terminated "
|
|
"[CID %d age %d]", conn->id, session->age);
|
|
spin_unlock_bh(&session->lock);
|
|
return FAILED;
|
|
}
|
|
|
|
if (sc->SCp.phase == session->age) {
|
|
debug_scsi("failing connection CID %d due to SCSI host reset",
|
|
conn->id);
|
|
fail_session = 1;
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
/*
|
|
* we drop the lock here but the leadconn cannot be destoyed while
|
|
* we are in the scsi eh
|
|
*/
|
|
if (fail_session)
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
|
|
debug_scsi("iscsi_eh_host_reset wait for relogin\n");
|
|
wait_event_interruptible(conn->ehwait,
|
|
session->state == ISCSI_STATE_TERMINATE ||
|
|
session->state == ISCSI_STATE_LOGGED_IN ||
|
|
session->state == ISCSI_STATE_RECOVERY_FAILED);
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
|
|
spin_lock_bh(&session->lock);
|
|
if (session->state == ISCSI_STATE_LOGGED_IN)
|
|
printk(KERN_INFO "iscsi: host reset succeeded\n");
|
|
else
|
|
goto failed;
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return SUCCESS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
|
|
|
|
static void iscsi_tmabort_timedout(unsigned long data)
|
|
{
|
|
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
spin_lock(&session->lock);
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
conn->tmabort_state = TMABORT_TIMEDOUT;
|
|
debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
|
|
ctask->sc, ctask->itt);
|
|
/* unblock eh_abort() */
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
spin_unlock(&session->lock);
|
|
}
|
|
|
|
/* must be called with the mutex lock */
|
|
static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
|
|
struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_tm *hdr = &conn->tmhdr;
|
|
int rc;
|
|
|
|
/*
|
|
* ctask timed out but session is OK requests must be serialized.
|
|
*/
|
|
memset(hdr, 0, sizeof(struct iscsi_tm));
|
|
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
|
|
hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
|
|
hdr->rtt = ctask->hdr->itt;
|
|
hdr->refcmdsn = ctask->hdr->cmdsn;
|
|
|
|
rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
|
|
NULL, 0);
|
|
if (rc) {
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
|
|
return rc;
|
|
}
|
|
|
|
debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
|
|
|
|
spin_lock_bh(&session->lock);
|
|
ctask->mtask = (struct iscsi_mgmt_task *)
|
|
session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
|
|
ISCSI_MGMT_ITT_OFFSET];
|
|
|
|
if (conn->tmabort_state == TMABORT_INITIAL) {
|
|
conn->tmfcmd_pdus_cnt++;
|
|
conn->tmabort_timer.expires = 10*HZ + jiffies;
|
|
conn->tmabort_timer.function = iscsi_tmabort_timedout;
|
|
conn->tmabort_timer.data = (unsigned long)ctask;
|
|
add_timer(&conn->tmabort_timer);
|
|
debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
mutex_unlock(&conn->xmitmutex);
|
|
|
|
/*
|
|
* block eh thread until:
|
|
*
|
|
* 1) abort response
|
|
* 2) abort timeout
|
|
* 3) session is terminated or restarted or userspace has
|
|
* given up on recovery
|
|
*/
|
|
wait_event_interruptible(conn->ehwait,
|
|
sc->SCp.phase != session->age ||
|
|
session->state != ISCSI_STATE_LOGGED_IN ||
|
|
conn->tmabort_state != TMABORT_INITIAL);
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
del_timer_sync(&conn->tmabort_timer);
|
|
|
|
mutex_lock(&conn->xmitmutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* xmit mutex and session lock must be held
|
|
*/
|
|
#define iscsi_remove_task(tasktype) \
|
|
static struct iscsi_##tasktype * \
|
|
iscsi_remove_##tasktype(struct kfifo *fifo, uint32_t itt) \
|
|
{ \
|
|
int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); \
|
|
struct iscsi_##tasktype *task; \
|
|
\
|
|
debug_scsi("searching %d tasks\n", nr_tasks); \
|
|
\
|
|
for (i = 0; i < nr_tasks; i++) { \
|
|
__kfifo_get(fifo, (void*)&task, sizeof(void*)); \
|
|
debug_scsi("check task %u\n", task->itt); \
|
|
\
|
|
if (task->itt == itt) { \
|
|
debug_scsi("matched task\n"); \
|
|
return task; \
|
|
} \
|
|
\
|
|
__kfifo_put(fifo, (void*)&task, sizeof(void*)); \
|
|
} \
|
|
return NULL; \
|
|
}
|
|
|
|
iscsi_remove_task(mgmt_task);
|
|
iscsi_remove_task(cmd_task);
|
|
|
|
static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
|
|
{
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
if (!ctask->mtask)
|
|
return -EINVAL;
|
|
|
|
if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
|
|
list_del(&ctask->mtask->running);
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
|
|
sizeof(void*));
|
|
ctask->mtask = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* session lock and xmitmutex must be held
|
|
*/
|
|
static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
|
|
int err)
|
|
{
|
|
struct scsi_cmnd *sc;
|
|
|
|
conn->session->tt->cleanup_cmd_task(conn, ctask);
|
|
iscsi_ctask_mtask_cleanup(ctask);
|
|
|
|
sc = ctask->sc;
|
|
if (!sc)
|
|
return;
|
|
sc->result = err;
|
|
sc->resid = sc->request_bufflen;
|
|
iscsi_complete_command(conn->session, ctask);
|
|
}
|
|
|
|
int iscsi_eh_abort(struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
|
|
struct iscsi_conn *conn = ctask->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_cmd_task *pending_ctask;
|
|
int rc;
|
|
|
|
conn->eh_abort_cnt++;
|
|
debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
|
|
|
|
mutex_lock(&conn->xmitmutex);
|
|
spin_lock_bh(&session->lock);
|
|
|
|
/*
|
|
* If we are not logged in or we have started a new session
|
|
* then let the host reset code handle this
|
|
*/
|
|
if (session->state != ISCSI_STATE_LOGGED_IN ||
|
|
sc->SCp.phase != session->age)
|
|
goto failed;
|
|
|
|
/* ctask completed before time out */
|
|
if (!ctask->sc)
|
|
goto success;
|
|
|
|
/* what should we do here ? */
|
|
if (conn->ctask == ctask) {
|
|
printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
|
|
"Failing abort\n", sc, ctask->itt);
|
|
goto failed;
|
|
}
|
|
|
|
/* check for the easy pending cmd abort */
|
|
pending_ctask = iscsi_remove_cmd_task(conn->xmitqueue, ctask->itt);
|
|
if (pending_ctask) {
|
|
/* iscsi_tcp queues write transfers on the xmitqueue */
|
|
if (list_empty(&pending_ctask->running)) {
|
|
debug_scsi("found pending task\n");
|
|
goto success;
|
|
} else
|
|
__kfifo_put(conn->xmitqueue, (void*)&pending_ctask,
|
|
sizeof(void*));
|
|
}
|
|
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
|
|
spin_unlock_bh(&session->lock);
|
|
rc = iscsi_exec_abort_task(sc, ctask);
|
|
spin_lock_bh(&session->lock);
|
|
|
|
iscsi_ctask_mtask_cleanup(ctask);
|
|
if (rc || sc->SCp.phase != session->age ||
|
|
session->state != ISCSI_STATE_LOGGED_IN)
|
|
goto failed;
|
|
|
|
/* ctask completed before tmf abort response */
|
|
if (!ctask->sc) {
|
|
debug_scsi("sc completed while abort in progress\n");
|
|
goto success;
|
|
}
|
|
|
|
if (conn->tmabort_state != TMABORT_SUCCESS) {
|
|
spin_unlock_bh(&session->lock);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
spin_lock_bh(&session->lock);
|
|
goto failed;
|
|
}
|
|
|
|
success:
|
|
debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
/*
|
|
* clean up task if aborted. we have the xmitmutex so grab
|
|
* the recv lock as a writer
|
|
*/
|
|
write_lock_bh(conn->recv_lock);
|
|
spin_lock(&session->lock);
|
|
fail_command(conn, ctask, DID_ABORT << 16);
|
|
spin_unlock(&session->lock);
|
|
write_unlock_bh(conn->recv_lock);
|
|
|
|
mutex_unlock(&conn->xmitmutex);
|
|
return SUCCESS;
|
|
|
|
failed:
|
|
spin_unlock_bh(&session->lock);
|
|
mutex_unlock(&conn->xmitmutex);
|
|
|
|
debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
|
|
return FAILED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_abort);
|
|
|
|
int
|
|
iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
|
|
{
|
|
int i;
|
|
|
|
*items = kmalloc(max * sizeof(void*), GFP_KERNEL);
|
|
if (*items == NULL)
|
|
return -ENOMEM;
|
|
|
|
q->max = max;
|
|
q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
|
|
if (q->pool == NULL) {
|
|
kfree(*items);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
|
|
GFP_KERNEL, NULL);
|
|
if (q->queue == ERR_PTR(-ENOMEM)) {
|
|
kfree(q->pool);
|
|
kfree(*items);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < max; i++) {
|
|
q->pool[i] = kmalloc(item_size, GFP_KERNEL);
|
|
if (q->pool[i] == NULL) {
|
|
int j;
|
|
|
|
for (j = 0; j < i; j++)
|
|
kfree(q->pool[j]);
|
|
|
|
kfifo_free(q->queue);
|
|
kfree(q->pool);
|
|
kfree(*items);
|
|
return -ENOMEM;
|
|
}
|
|
memset(q->pool[i], 0, item_size);
|
|
(*items)[i] = q->pool[i];
|
|
__kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_pool_init);
|
|
|
|
void iscsi_pool_free(struct iscsi_queue *q, void **items)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < q->max; i++)
|
|
kfree(items[i]);
|
|
kfree(q->pool);
|
|
kfree(items);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_pool_free);
|
|
|
|
/*
|
|
* iSCSI Session's hostdata organization:
|
|
*
|
|
* *------------------* <== hostdata_session(host->hostdata)
|
|
* | ptr to class sess|
|
|
* |------------------| <== iscsi_hostdata(host->hostdata)
|
|
* | iscsi_session |
|
|
* *------------------*
|
|
*/
|
|
|
|
#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
|
|
_sz % sizeof(unsigned long))
|
|
|
|
#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
|
|
|
|
/**
|
|
* iscsi_session_setup - create iscsi cls session and host and session
|
|
* @scsit: scsi transport template
|
|
* @iscsit: iscsi transport template
|
|
* @initial_cmdsn: initial CmdSN
|
|
* @hostno: host no allocated
|
|
*
|
|
* This can be used by software iscsi_transports that allocate
|
|
* a session per scsi host.
|
|
**/
|
|
struct iscsi_cls_session *
|
|
iscsi_session_setup(struct iscsi_transport *iscsit,
|
|
struct scsi_transport_template *scsit,
|
|
int cmd_task_size, int mgmt_task_size,
|
|
uint32_t initial_cmdsn, uint32_t *hostno)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_session *session;
|
|
struct iscsi_cls_session *cls_session;
|
|
int cmd_i;
|
|
|
|
shost = scsi_host_alloc(iscsit->host_template,
|
|
hostdata_privsize(sizeof(*session)));
|
|
if (!shost)
|
|
return NULL;
|
|
|
|
shost->max_id = 1;
|
|
shost->max_channel = 0;
|
|
shost->max_lun = iscsit->max_lun;
|
|
shost->max_cmd_len = iscsit->max_cmd_len;
|
|
shost->transportt = scsit;
|
|
shost->transportt->create_work_queue = 1;
|
|
*hostno = shost->host_no;
|
|
|
|
session = iscsi_hostdata(shost->hostdata);
|
|
memset(session, 0, sizeof(struct iscsi_session));
|
|
session->host = shost;
|
|
session->state = ISCSI_STATE_FREE;
|
|
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
|
|
session->cmds_max = ISCSI_XMIT_CMDS_MAX;
|
|
session->cmdsn = initial_cmdsn;
|
|
session->exp_cmdsn = initial_cmdsn + 1;
|
|
session->max_cmdsn = initial_cmdsn + 1;
|
|
session->max_r2t = 1;
|
|
session->tt = iscsit;
|
|
|
|
/* initialize SCSI PDU commands pool */
|
|
if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
|
|
(void***)&session->cmds,
|
|
cmd_task_size + sizeof(struct iscsi_cmd_task)))
|
|
goto cmdpool_alloc_fail;
|
|
|
|
/* pre-format cmds pool with ITT */
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
|
|
|
|
if (cmd_task_size)
|
|
ctask->dd_data = &ctask[1];
|
|
ctask->itt = cmd_i;
|
|
}
|
|
|
|
spin_lock_init(&session->lock);
|
|
INIT_LIST_HEAD(&session->connections);
|
|
|
|
/* initialize immediate command pool */
|
|
if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
|
|
(void***)&session->mgmt_cmds,
|
|
mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
|
|
goto mgmtpool_alloc_fail;
|
|
|
|
|
|
/* pre-format immediate cmds pool with ITT */
|
|
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
|
|
struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
|
|
|
|
if (mgmt_task_size)
|
|
mtask->dd_data = &mtask[1];
|
|
mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
|
|
}
|
|
|
|
if (scsi_add_host(shost, NULL))
|
|
goto add_host_fail;
|
|
|
|
cls_session = iscsi_create_session(shost, iscsit, 0);
|
|
if (!cls_session)
|
|
goto cls_session_fail;
|
|
*(unsigned long*)shost->hostdata = (unsigned long)cls_session;
|
|
|
|
return cls_session;
|
|
|
|
cls_session_fail:
|
|
scsi_remove_host(shost);
|
|
add_host_fail:
|
|
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
|
|
mgmtpool_alloc_fail:
|
|
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
|
|
cmdpool_alloc_fail:
|
|
scsi_host_put(shost);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_setup);
|
|
|
|
/**
|
|
* iscsi_session_teardown - destroy session, host, and cls_session
|
|
* shost: scsi host
|
|
*
|
|
* This can be used by software iscsi_transports that allocate
|
|
* a session per scsi host.
|
|
**/
|
|
void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
|
struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
|
|
|
|
scsi_remove_host(shost);
|
|
|
|
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
|
|
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
|
|
|
|
iscsi_destroy_session(cls_session);
|
|
scsi_host_put(shost);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_teardown);
|
|
|
|
/**
|
|
* iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
|
|
* @cls_session: iscsi_cls_session
|
|
* @conn_idx: cid
|
|
**/
|
|
struct iscsi_cls_conn *
|
|
iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
|
|
{
|
|
struct iscsi_session *session = class_to_transport_session(cls_session);
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cls_conn *cls_conn;
|
|
char *data;
|
|
|
|
cls_conn = iscsi_create_conn(cls_session, conn_idx);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
memset(conn, 0, sizeof(*conn));
|
|
|
|
conn->session = session;
|
|
conn->cls_conn = cls_conn;
|
|
conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
|
|
conn->id = conn_idx;
|
|
conn->exp_statsn = 0;
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
INIT_LIST_HEAD(&conn->run_list);
|
|
INIT_LIST_HEAD(&conn->mgmt_run_list);
|
|
|
|
/* initialize general xmit PDU commands queue */
|
|
conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
|
|
GFP_KERNEL, NULL);
|
|
if (conn->xmitqueue == ERR_PTR(-ENOMEM))
|
|
goto xmitqueue_alloc_fail;
|
|
|
|
/* initialize general immediate & non-immediate PDU commands queue */
|
|
conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
|
|
GFP_KERNEL, NULL);
|
|
if (conn->immqueue == ERR_PTR(-ENOMEM))
|
|
goto immqueue_alloc_fail;
|
|
|
|
conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
|
|
GFP_KERNEL, NULL);
|
|
if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
|
|
goto mgmtqueue_alloc_fail;
|
|
|
|
INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
|
|
|
|
/* allocate login_mtask used for the login/text sequences */
|
|
spin_lock_bh(&session->lock);
|
|
if (!__kfifo_get(session->mgmtpool.queue,
|
|
(void*)&conn->login_mtask,
|
|
sizeof(void*))) {
|
|
spin_unlock_bh(&session->lock);
|
|
goto login_mtask_alloc_fail;
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
|
|
if (!data)
|
|
goto login_mtask_data_alloc_fail;
|
|
conn->login_mtask->data = data;
|
|
|
|
init_timer(&conn->tmabort_timer);
|
|
mutex_init(&conn->xmitmutex);
|
|
init_waitqueue_head(&conn->ehwait);
|
|
|
|
return cls_conn;
|
|
|
|
login_mtask_data_alloc_fail:
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
|
|
sizeof(void*));
|
|
login_mtask_alloc_fail:
|
|
kfifo_free(conn->mgmtqueue);
|
|
mgmtqueue_alloc_fail:
|
|
kfifo_free(conn->immqueue);
|
|
immqueue_alloc_fail:
|
|
kfifo_free(conn->xmitqueue);
|
|
xmitqueue_alloc_fail:
|
|
iscsi_destroy_conn(cls_conn);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_setup);
|
|
|
|
/**
|
|
* iscsi_conn_teardown - teardown iscsi connection
|
|
* cls_conn: iscsi class connection
|
|
*
|
|
* TODO: we may need to make this into a two step process
|
|
* like scsi-mls remove + put host
|
|
*/
|
|
void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
unsigned long flags;
|
|
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
mutex_lock(&conn->xmitmutex);
|
|
if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) {
|
|
if (session->tt->suspend_conn_recv)
|
|
session->tt->suspend_conn_recv(conn);
|
|
|
|
session->tt->terminate_conn(conn);
|
|
}
|
|
|
|
spin_lock_bh(&session->lock);
|
|
conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
|
|
if (session->leadconn == conn) {
|
|
/*
|
|
* leading connection? then give up on recovery.
|
|
*/
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
mutex_unlock(&conn->xmitmutex);
|
|
|
|
/*
|
|
* Block until all in-progress commands for this connection
|
|
* time out or fail.
|
|
*/
|
|
for (;;) {
|
|
spin_lock_irqsave(session->host->host_lock, flags);
|
|
if (!session->host->host_busy) { /* OK for ERL == 0 */
|
|
spin_unlock_irqrestore(session->host->host_lock, flags);
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(session->host->host_lock, flags);
|
|
msleep_interruptible(500);
|
|
printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
|
|
"host_failed %d\n", session->host->host_busy,
|
|
session->host->host_failed);
|
|
/*
|
|
* force eh_abort() to unblock
|
|
*/
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
|
|
spin_lock_bh(&session->lock);
|
|
kfree(conn->login_mtask->data);
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
|
|
sizeof(void*));
|
|
list_del(&conn->item);
|
|
if (list_empty(&session->connections))
|
|
session->leadconn = NULL;
|
|
if (session->leadconn && session->leadconn == conn)
|
|
session->leadconn = container_of(session->connections.next,
|
|
struct iscsi_conn, item);
|
|
|
|
if (session->leadconn == NULL)
|
|
/* no connections exits.. reset sequencing */
|
|
session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
kfifo_free(conn->xmitqueue);
|
|
kfifo_free(conn->immqueue);
|
|
kfifo_free(conn->mgmtqueue);
|
|
|
|
iscsi_destroy_conn(cls_conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
|
|
|
|
int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
if (session == NULL) {
|
|
printk(KERN_ERR "iscsi: can't start unbound connection\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
spin_lock_bh(&session->lock);
|
|
conn->c_stage = ISCSI_CONN_STARTED;
|
|
session->state = ISCSI_STATE_LOGGED_IN;
|
|
|
|
switch(conn->stop_stage) {
|
|
case STOP_CONN_RECOVER:
|
|
/*
|
|
* unblock eh_abort() if it is blocked. re-try all
|
|
* commands after successful recovery
|
|
*/
|
|
conn->stop_stage = 0;
|
|
conn->tmabort_state = TMABORT_INITIAL;
|
|
session->age++;
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
iscsi_unblock_session(session_to_cls(session));
|
|
wake_up(&conn->ehwait);
|
|
return 0;
|
|
case STOP_CONN_TERM:
|
|
conn->stop_stage = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_start);
|
|
|
|
static void
|
|
flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_mgmt_task *mtask, *tmp;
|
|
|
|
/* handle pending */
|
|
while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
|
|
__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
|
|
if (mtask == conn->login_mtask)
|
|
continue;
|
|
debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
|
|
sizeof(void*));
|
|
}
|
|
|
|
/* handle running */
|
|
list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
|
|
debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
|
|
list_del(&mtask->running);
|
|
|
|
if (mtask == conn->login_mtask)
|
|
continue;
|
|
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
|
|
sizeof(void*));
|
|
}
|
|
|
|
conn->mtask = NULL;
|
|
}
|
|
|
|
/* Fail commands. Mutex and session lock held and recv side suspended */
|
|
static void fail_all_commands(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_cmd_task *ctask, *tmp;
|
|
|
|
/* flush pending */
|
|
while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) {
|
|
debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
|
|
ctask->itt);
|
|
fail_command(conn, ctask, DID_BUS_BUSY << 16);
|
|
}
|
|
|
|
/* fail all other running */
|
|
list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
|
|
debug_scsi("failing in progress sc %p itt 0x%x\n",
|
|
ctask->sc, ctask->itt);
|
|
fail_command(conn, ctask, DID_BUS_BUSY << 16);
|
|
}
|
|
|
|
conn->ctask = NULL;
|
|
}
|
|
|
|
static void iscsi_start_session_recovery(struct iscsi_session *session,
|
|
struct iscsi_conn *conn, int flag)
|
|
{
|
|
int old_stop_stage;
|
|
|
|
spin_lock_bh(&session->lock);
|
|
if (conn->stop_stage == STOP_CONN_TERM) {
|
|
spin_unlock_bh(&session->lock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* When this is called for the in_login state, we only want to clean
|
|
* up the login task and connection. We do not need to block and set
|
|
* the recovery state again
|
|
*/
|
|
if (flag == STOP_CONN_TERM)
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
else if (conn->stop_stage != STOP_CONN_RECOVER)
|
|
session->state = ISCSI_STATE_IN_RECOVERY;
|
|
|
|
old_stop_stage = conn->stop_stage;
|
|
conn->stop_stage = flag;
|
|
conn->c_stage = ISCSI_CONN_STOPPED;
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
if (session->tt->suspend_conn_recv)
|
|
session->tt->suspend_conn_recv(conn);
|
|
|
|
mutex_lock(&conn->xmitmutex);
|
|
/*
|
|
* for connection level recovery we should not calculate
|
|
* header digest. conn->hdr_size used for optimization
|
|
* in hdr_extract() and will be re-negotiated at
|
|
* set_param() time.
|
|
*/
|
|
if (flag == STOP_CONN_RECOVER) {
|
|
conn->hdrdgst_en = 0;
|
|
conn->datadgst_en = 0;
|
|
if (session->state == ISCSI_STATE_IN_RECOVERY &&
|
|
old_stop_stage != STOP_CONN_RECOVER) {
|
|
debug_scsi("blocking session\n");
|
|
iscsi_block_session(session_to_cls(session));
|
|
}
|
|
}
|
|
|
|
session->tt->terminate_conn(conn);
|
|
/*
|
|
* flush queues.
|
|
*/
|
|
spin_lock_bh(&session->lock);
|
|
fail_all_commands(conn);
|
|
flush_control_queues(session, conn);
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
mutex_unlock(&conn->xmitmutex);
|
|
}
|
|
|
|
void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
switch (flag) {
|
|
case STOP_CONN_RECOVER:
|
|
case STOP_CONN_TERM:
|
|
iscsi_start_session_recovery(session, conn, flag);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_stop);
|
|
|
|
int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn, int is_leading)
|
|
{
|
|
struct iscsi_session *session = class_to_transport_session(cls_session);
|
|
struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
|
|
|
|
/* lookup for existing connection */
|
|
spin_lock_bh(&session->lock);
|
|
list_for_each_entry(tmp, &session->connections, item) {
|
|
if (tmp == conn) {
|
|
if (conn->c_stage != ISCSI_CONN_STOPPED ||
|
|
conn->stop_stage == STOP_CONN_TERM) {
|
|
printk(KERN_ERR "iscsi: can't bind "
|
|
"non-stopped connection (%d:%d)\n",
|
|
conn->c_stage, conn->stop_stage);
|
|
spin_unlock_bh(&session->lock);
|
|
return -EIO;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (tmp != conn) {
|
|
/* bind new iSCSI connection to session */
|
|
conn->session = session;
|
|
list_add(&conn->item, &session->connections);
|
|
}
|
|
spin_unlock_bh(&session->lock);
|
|
|
|
if (is_leading)
|
|
session->leadconn = conn;
|
|
|
|
/*
|
|
* Unblock xmitworker(), Login Phase will pass through.
|
|
*/
|
|
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
|
|
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_bind);
|
|
|
|
MODULE_AUTHOR("Mike Christie");
|
|
MODULE_DESCRIPTION("iSCSI library functions");
|
|
MODULE_LICENSE("GPL");
|