joel16/android_kernel_sony_msm8994
1
0
Fork 0
mirror of https://github.com/joel16/android_kernel_sony_msm8994.git synced 2024-11-28 22:51:06 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[SCSI] libiscsi: fix cmd seqeunce number checking

Browse Source 
We should not be checking the cmd windown for just handling r2t responses.
And if the window closes in on us, always have scsi-ml requeue the command
from our queuecommand function.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2007-07-26 12:46:48 -05:00 committed by James Bottomley
parent 7974392c0b
commit e07264071f
2 changed files with 28 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/scsi/libiscsi.c
View File

@ -596,9 +596,16 @@ static void iscsi_prep_mtask(struct iscsi_conn *conn,
nop->cmdsn = cpu_to_be32(session->cmdsn);
if (hdr->itt != RESERVED_ITT) {
hdr->itt = build_itt(mtask->itt, conn->id, session->age);
/*
* TODO: We always use immediate, so we never hit this.
* If we start to send tmfs or nops as non-immediate then
* we should start checking the cmdsn numbers for mgmt tasks.
*/
if (conn->c_stage == ISCSI_CONN_STARTED &&
!(hdr->opcode & ISCSI_OP_IMMEDIATE))
!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
session->queued_cmdsn++;
session->cmdsn++;
}
}
if (session->tt->init_mgmt_task)
@ -641,9 +648,11 @@ static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
/*
* Check for iSCSI window and take care of CmdSN wrap-around
*/
if (!iscsi_sna_lte(session->cmdsn, session->max_cmdsn)) {
debug_scsi("iSCSI CmdSN closed. MaxCmdSN %u CmdSN %u\n",
session->max_cmdsn, session->cmdsn);
if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
"CmdSN %u/%u\n", session->exp_cmdsn,
session->max_cmdsn, session->cmdsn,
session->queued_cmdsn);
return -ENOSPC;
}
return 0;
@ -722,11 +731,6 @@ check_mgmt:
/* process command queue */
while (!list_empty(&conn->xmitqueue)) {
rc = iscsi_check_cmdsn_window_closed(conn);
if (rc) {
spin_unlock_bh(&conn->session->lock);
return rc;
}
/*
* iscsi tcp may readd the task to the xmitqueue to send
* write data
@ -834,12 +838,6 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
goto fault;
}
/*
* We check this here and in data xmit, because if we get to the point
* that this check is hitting the window then we have enough IO in
* flight and enough IO waiting to be transmitted it is better
* to let the scsi/block layer queue up.
*/
if (iscsi_check_cmdsn_window_closed(conn)) {
reason = FAILURE_WINDOW_CLOSED;
goto reject;
@ -850,6 +848,8 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
reason = FAILURE_OOM;
goto reject;
}
session->queued_cmdsn++;
sc->SCp.phase = session->age;
sc->SCp.ptr = (char *)ctask;
@ -1140,7 +1140,13 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
if (!sc)
return;
if (ctask->state != ISCSI_TASK_PENDING)
if (ctask->state == ISCSI_TASK_PENDING)
/*
* cmd never made it to the xmit thread, so we should not count
* the cmd in the sequencing
*/
conn->session->queued_cmdsn--;
else
conn->session->tt->cleanup_cmd_task(conn, ctask);
iscsi_ctask_mtask_cleanup(ctask);
@ -1392,7 +1398,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
session->state = ISCSI_STATE_FREE;
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
session->cmds_max = cmds_max;
session->cmdsn = initial_cmdsn;
session->queued_cmdsn = session->cmdsn = initial_cmdsn;
session->exp_cmdsn = initial_cmdsn + 1;
session->max_cmdsn = initial_cmdsn + 1;
session->max_r2t = 1;
@ -1616,11 +1622,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
kfree(conn->persistent_address);
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
sizeof(void*));
if (session->leadconn == conn) {
if (session->leadconn == conn)
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->mgmtqueue);
@ -1650,6 +1653,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
spin_lock_bh(&session->lock);
conn->c_stage = ISCSI_CONN_STARTED;
session->state = ISCSI_STATE_LOGGED_IN;
session->queued_cmdsn = session->cmdsn;
switch(conn->stop_stage) {
case STOP_CONN_RECOVER:

3
include/scsi/libiscsi.h
View File

@ -210,6 +210,9 @@ struct iscsi_session {
uint32_t exp_cmdsn;
uint32_t max_cmdsn;
/* This tracks the reqs queued into the initiator */
uint32_t queued_cmdsn;
/* configuration */
int initial_r2t_en;
unsigned max_r2t;