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scsi: qla2xxx: Fix exchange oversubscription for management commands

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Add resource checking for management (non-I/O) commands.

Fixes: 89c72f4245 ("scsi: qla2xxx: Add IOCB resource tracking")
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2022-12-19 03:07:42 -08:00 committed by Martin K. Petersen
parent 41e5afe51f
commit 5f63a163ed
4 changed files with 80 additions and 3 deletions
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10
drivers/scsi/qla2xxx/qla_dfs.c
View File

@ -235,7 +235,7 @@ qla_dfs_fw_resource_cnt_show(struct seq_file *s, void *unused)
uint16_t mb[MAX_IOCB_MB_REG];
int rc;
struct qla_hw_data *ha = vha->hw;
u16 iocbs_used, i;
u16 iocbs_used, i, exch_used;
rc = qla24xx_res_count_wait(vha, mb, SIZEOF_IOCB_MB_REG);
if (rc != QLA_SUCCESS) {
@ -263,13 +263,19 @@ qla_dfs_fw_resource_cnt_show(struct seq_file *s, void *unused)
if (ql2xenforce_iocb_limit) {
/* lock is not require. It's an estimate. */
iocbs_used = ha->base_qpair->fwres.iocbs_used;
exch_used = ha->base_qpair->fwres.exch_used;
for (i = 0; i < ha->max_qpairs; i++) {
if (ha->queue_pair_map[i])
if (ha->queue_pair_map[i]) {
iocbs_used += ha->queue_pair_map[i]->fwres.iocbs_used;
exch_used += ha->queue_pair_map[i]->fwres.exch_used;
}
}
seq_printf(s, "Driver: estimate iocb used [%d] high water limit [%d]\n",
iocbs_used, ha->base_qpair->fwres.iocbs_limit);
seq_printf(s, "estimate exchange used[%d] high water limit [%d] n",
exch_used, ha->base_qpair->fwres.exch_limit);
}
return 0;

3
drivers/scsi/qla2xxx/qla_inline.h
View File

@ -396,6 +396,8 @@ qla_get_fw_resources(struct qla_qpair *qp, struct iocb_resource *iores)
iores->res_type = RESOURCE_NONE;
return 0;
}
if (iores->res_type & RESOURCE_FORCE)
goto force;
if ((iores->iocb_cnt + qp->fwres.iocbs_used) >= qp->fwres.iocbs_qp_limit) {
/* no need to acquire qpair lock. It's just rough calculation */
@ -423,6 +425,7 @@ qla_get_fw_resources(struct qla_qpair *qp, struct iocb_resource *iores)
return -ENOSPC;
}
}
force:
qp->fwres.iocbs_used += iores->iocb_cnt;
qp->fwres.exch_used += iores->exch_cnt;
return 0;

67
drivers/scsi/qla2xxx/qla_iocb.c
View File

@ -3817,6 +3817,65 @@ qla24xx_prlo_iocb(srb_t *sp, struct logio_entry_24xx *logio)
logio->vp_index = sp->fcport->vha->vp_idx;
}
int qla_get_iocbs_resource(struct srb *sp)
{
bool get_exch;
bool push_it_through = false;
if (!ql2xenforce_iocb_limit) {
sp->iores.res_type = RESOURCE_NONE;
return 0;
}
sp->iores.res_type = RESOURCE_NONE;
switch (sp->type) {
case SRB_TM_CMD:
case SRB_PRLI_CMD:
case SRB_ADISC_CMD:
push_it_through = true;
fallthrough;
case SRB_LOGIN_CMD:
case SRB_ELS_CMD_RPT:
case SRB_ELS_CMD_HST:
case SRB_ELS_CMD_HST_NOLOGIN:
case SRB_CT_CMD:
case SRB_NVME_LS:
case SRB_ELS_DCMD:
get_exch = true;
break;
case SRB_FXIOCB_DCMD:
case SRB_FXIOCB_BCMD:
sp->iores.res_type = RESOURCE_NONE;
return 0;
case SRB_SA_UPDATE:
case SRB_SA_REPLACE:
case SRB_MB_IOCB:
case SRB_ABT_CMD:
case SRB_NACK_PLOGI:
case SRB_NACK_PRLI:
case SRB_NACK_LOGO:
case SRB_LOGOUT_CMD:
case SRB_CTRL_VP:
push_it_through = true;
fallthrough;
default:
get_exch = false;
}
sp->iores.res_type |= RESOURCE_IOCB;
sp->iores.iocb_cnt = 1;
if (get_exch) {
sp->iores.res_type |= RESOURCE_EXCH;
sp->iores.exch_cnt = 1;
}
if (push_it_through)
sp->iores.res_type |= RESOURCE_FORCE;
return qla_get_fw_resources(sp->qpair, &sp->iores);
}
int
qla2x00_start_sp(srb_t *sp)
{
@ -3831,6 +3890,12 @@ qla2x00_start_sp(srb_t *sp)
return -EIO;
spin_lock_irqsave(qp->qp_lock_ptr, flags);
rval = qla_get_iocbs_resource(sp);
if (rval) {
spin_unlock_irqrestore(qp->qp_lock_ptr, flags);
return -EAGAIN;
}
pkt = __qla2x00_alloc_iocbs(sp->qpair, sp);
if (!pkt) {
rval = EAGAIN;
@ -3931,6 +3996,8 @@ qla2x00_start_sp(srb_t *sp)
wmb();
qla2x00_start_iocbs(vha, qp->req);
done:
if (rval)
qla_put_fw_resources(sp->qpair, &sp->iores);
spin_unlock_irqrestore(qp->qp_lock_ptr, flags);
return rval;
}

1
drivers/scsi/qla2xxx/qla_isr.c
View File

@ -3112,6 +3112,7 @@ qla25xx_process_bidir_status_iocb(scsi_qla_host_t *vha, void *pkt,
}
bsg_reply->reply_payload_rcv_len = 0;
qla_put_fw_resources(sp->qpair, &sp->iores);
done:
/* Return the vendor specific reply to API */
bsg_reply->reply_data.vendor_reply.vendor_rsp[0] = rval;