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scsi: qla2xxx: Reduce the use of terminate exchange 

reduce usage of terminate exchange when command encounter
resource bottle neck.  Remote initiator view it as command
drop.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2017-12-28 12:33:28 -08:00 committed by Martin K. Petersen
parent 9d1aa4e14e
commit 7cf95f7e01
1 changed files with 74 additions and 66 deletions
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140
drivers/scsi/qla2xxx/qla_target.c
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@ -75,7 +75,8 @@ MODULE_PARM_DESC(ql2xuctrlirq,
int ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
static int temp_sam_status = SAM_STAT_BUSY;
static int qla_sam_status = SAM_STAT_BUSY;
static int tc_sam_status = SAM_STAT_TASK_SET_FULL; /* target core */
/*
* From scsi/fc/fc_fcp.h
@ -4275,14 +4276,14 @@ static void qlt_create_sess_from_atio(struct work_struct *work)
if (op->atio.u.raw.entry_count > 1) {
ql_dbg(ql_dbg_tgt_mgt, vha, 0xf023,
"Dropping multy entry atio %p\n", &op->atio);
goto out_term;
goto out_busy;
}
sess = qlt_make_local_sess(vha, s_id);
/* sess has an extra creation ref. */
if (!sess)
goto out_term;
goto out_busy;
/*
* Now obtain a pre-allocated session tag using the original op->atio
* packet header, and dispatch into __qlt_do_work() using the existing
@ -4293,7 +4294,7 @@ static void qlt_create_sess_from_atio(struct work_struct *work)
struct qla_qpair *qpair = ha->base_qpair;
spin_lock_irqsave(qpair->qp_lock_ptr, flags);
qlt_send_busy(qpair, &op->atio, SAM_STAT_BUSY);
qlt_send_busy(qpair, &op->atio, tc_sam_status);
spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
@ -4313,6 +4314,17 @@ static void qlt_create_sess_from_atio(struct work_struct *work)
out_term:
qlt_send_term_exchange(vha->hw->base_qpair, NULL, &op->atio, 0, 0);
kfree(op);
return;
out_busy:
{
struct qla_qpair *qpair = ha->base_qpair;
spin_lock_irqsave(qpair->qp_lock_ptr, flags);
qlt_send_busy(qpair, &op->atio, qla_sam_status);
spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
kfree(op);
}
return;
}
/* ha->hardware_lock supposed to be held on entry */
@ -4329,7 +4341,7 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
if (unlikely(tgt->tgt_stop)) {
ql_dbg(ql_dbg_io, vha, 0x3061,
"New command while device %p is shutting down\n", tgt);
return -EFAULT;
return -ENODEV;
}
id.b.al_pa = atio->u.isp24.fcp_hdr.s_id[2];
@ -4384,7 +4396,7 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
ha->tgt.tgt_ops->put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
return -ENOMEM;
return -EBUSY;
}
cmd->cmd_in_wq = 1;
@ -5485,7 +5497,6 @@ qlt_chk_qfull_thresh_hold(struct scsi_qla_host *vha, struct qla_qpair *qpair,
struct atio_from_isp *atio, uint8_t ha_locked)
{
struct qla_hw_data *ha = vha->hw;
uint16_t status;
unsigned long flags;
if (ha->tgt.num_pend_cmds < Q_FULL_THRESH_HOLD(ha))
@ -5493,8 +5504,7 @@ qlt_chk_qfull_thresh_hold(struct scsi_qla_host *vha, struct qla_qpair *qpair,
if (!ha_locked)
spin_lock_irqsave(&ha->hardware_lock, flags);
status = temp_sam_status;
qlt_send_busy(qpair, atio, status);
qlt_send_busy(qpair, atio, qla_sam_status);
if (!ha_locked)
spin_unlock_irqrestore(&ha->hardware_lock, flags);
@ -5509,7 +5519,7 @@ static void qlt_24xx_atio_pkt(struct scsi_qla_host *vha,
struct qla_hw_data *ha = vha->hw;
struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
int rc;
unsigned long flags;
unsigned long flags = 0;
if (unlikely(tgt == NULL)) {
ql_dbg(ql_dbg_tgt, vha, 0x3064,
@ -5533,8 +5543,7 @@ static void qlt_24xx_atio_pkt(struct scsi_qla_host *vha,
"sending QUEUE_FULL\n", vha->vp_idx);
if (!ha_locked)
spin_lock_irqsave(&ha->hardware_lock, flags);
qlt_send_busy(ha->base_qpair, atio,
SAM_STAT_TASK_SET_FULL);
qlt_send_busy(ha->base_qpair, atio, qla_sam_status);
if (!ha_locked)
spin_unlock_irqrestore(&ha->hardware_lock,
flags);
@ -5553,42 +5562,37 @@ static void qlt_24xx_atio_pkt(struct scsi_qla_host *vha,
rc = qlt_handle_task_mgmt(vha, atio);
}
if (unlikely(rc != 0)) {
if (rc == -ESRCH) {
if (!ha_locked)
spin_lock_irqsave(&ha->hardware_lock,
flags);
#if 1 /* With TERM EXCHANGE some FC cards refuse to boot */
qlt_send_busy(ha->base_qpair, atio,
SAM_STAT_BUSY);
#else
if (!ha_locked)
spin_lock_irqsave(&ha->hardware_lock, flags);
switch (rc) {
case -ENODEV:
ql_dbg(ql_dbg_tgt, vha, 0xe05f,
"qla_target: Unable to send command to target\n");
break;
case -EBADF:
ql_dbg(ql_dbg_tgt, vha, 0xe05f,
"qla_target: Unable to send command to target, sending TERM EXCHANGE for rsp\n");
qlt_send_term_exchange(ha->base_qpair, NULL,
atio, 1, 0);
#endif
if (!ha_locked)
spin_unlock_irqrestore(
&ha->hardware_lock, flags);
} else {
if (tgt->tgt_stop) {
ql_dbg(ql_dbg_tgt, vha, 0xe059,
"qla_target: Unable to send "
"command to target for req, "
"ignoring.\n");
} else {
ql_dbg(ql_dbg_tgt, vha, 0xe05a,
"qla_target(%d): Unable to send "
"command to target, sending BUSY "
"status.\n", vha->vp_idx);
if (!ha_locked)
spin_lock_irqsave(
&ha->hardware_lock, flags);
qlt_send_busy(ha->base_qpair,
atio, SAM_STAT_BUSY);
if (!ha_locked)
spin_unlock_irqrestore(
&ha->hardware_lock, flags);
}
break;
case -EBUSY:
ql_dbg(ql_dbg_tgt, vha, 0xe060,
"qla_target(%d): Unable to send command to target, sending BUSY status\n",
vha->vp_idx);
qlt_send_busy(ha->base_qpair, atio,
tc_sam_status);
break;
default:
ql_dbg(ql_dbg_tgt, vha, 0xe060,
"qla_target(%d): Unable to send command to target, sending BUSY status\n",
vha->vp_idx);
qlt_send_busy(ha->base_qpair, atio,
qla_sam_status);
break;
}
if (!ha_locked)
spin_unlock_irqrestore(&ha->hardware_lock,
flags);
}
break;
@ -5671,27 +5675,31 @@ static void qlt_response_pkt(struct scsi_qla_host *vha,
rc = qlt_handle_cmd_for_atio(vha, atio);
if (unlikely(rc != 0)) {
if (rc == -ESRCH) {
#if 1 /* With TERM EXCHANGE some FC cards refuse to boot */
qlt_send_busy(rsp->qpair, atio, 0);
#else
qlt_send_term_exchange(rsp->qpair, NULL, atio, 1, 0);
#endif
} else {
if (tgt->tgt_stop) {
ql_dbg(ql_dbg_tgt, vha, 0xe05f,
"qla_target: Unable to send "
"command to target, sending TERM "
"EXCHANGE for rsp\n");
qlt_send_term_exchange(rsp->qpair, NULL,
atio, 1, 0);
} else {
ql_dbg(ql_dbg_tgt, vha, 0xe060,
"qla_target(%d): Unable to send "
"command to target, sending BUSY "
"status\n", vha->vp_idx);
qlt_send_busy(rsp->qpair, atio, 0);
}
switch (rc) {
case -ENODEV:
ql_dbg(ql_dbg_tgt, vha, 0xe05f,
"qla_target: Unable to send command to target\n");
break;
case -EBADF:
ql_dbg(ql_dbg_tgt, vha, 0xe05f,
"qla_target: Unable to send command to target, sending TERM EXCHANGE for rsp\n");
qlt_send_term_exchange(rsp->qpair, NULL,
atio, 1, 0);
break;
case -EBUSY:
ql_dbg(ql_dbg_tgt, vha, 0xe060,
"qla_target(%d): Unable to send command to target, sending BUSY status\n",
vha->vp_idx);
qlt_send_busy(rsp->qpair, atio,
tc_sam_status);
break;
default:
ql_dbg(ql_dbg_tgt, vha, 0xe060,
"qla_target(%d): Unable to send command to target, sending BUSY status\n",
vha->vp_idx);
qlt_send_busy(rsp->qpair, atio,
qla_sam_status);
break;
}
}
}