[PATCH 22/25] qla2xxx: Enable auto SCSI BUSY status for target mode

Himanshu Madhani
2017-05-19T22:30:23Z

From: Quinn Tran <quinn.tran@cavium.com>

Accelerate generation of SCSI busy to let initiators slow
down when target is running low in resources.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
---
drivers/scsi/qla2xxx/qla_init.c | 13 +++++++++++--
drivers/scsi/qla2xxx/qla_mbx.c | 2 ++
2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 0b91b886e5a3..497cba4ba72f 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -7379,10 +7379,19 @@ qla81xx_update_fw_options(scsi_qla_host_t *vha)
}

if (qla_tgt_mode_enabled(vha) ||
- qla_dual_mode_enabled(vha))
+ qla_dual_mode_enabled(vha)) {
+ /* FW auto send SCSI status during */
+ ha->fw_options[1] |= BIT_8;
+ ha->fw_options[10] |= (u16)SAM_STAT_BUSY << 8;
+
+ /* FW perform Exchang validation */
ha->fw_options[2] |= BIT_4;
- else
+ } else {
+ ha->fw_options[1] &= ~BIT_8;
+ ha->fw_options[10] &= 0x00ff;
+
ha->fw_options[2] &= ~BIT_4;
+ }

if (ql2xetsenable) {
/* Enable ETS Burst. */
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index e69b854f19ae..864a2db3a317 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -1048,6 +1048,8 @@ qla2x00_set_fw_options(scsi_qla_host_t *vha, uint16_t *fwopts)
mcp->in_mb = MBX_0;
if (IS_FWI2_CAPABLE(vha->hw)) {
mcp->in_mb |= MBX_1;
+ mcp->mb[10] = fwopts[10];
+ mcp->out_mb |= MBX_10;
} else {
mcp->mb[10] = fwopts[10];
mcp->mb[11] = fwopts[11];
--
2.12.0