[PATCH 13/43] qla2xxx: Use shadow register for ISP27XX

Himanshu Madhani
2017-12-20T06:57:12Z

For ISP27XX, use shadow register to read FW provided REQQ's consumer
index. The shadow register is dma'ed by firmware.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
---
drivers/scsi/qla2xxx/qla_iocb.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index 417c40f21244..519a0d2920b8 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -2192,7 +2192,9 @@ __qla2x00_alloc_iocbs(struct qla_qpair *qpair, srb_t *sp)
skip_cmd_array:
/* Check for room on request queue. */
if (req->cnt < req_cnt + 2) {
- if (ha->mqenable || IS_QLA83XX(ha) || IS_QLA27XX(ha))
+ if (qpair->use_shadow_reg)
+ cnt = *req->out_ptr;
+ else if (ha->mqenable || IS_QLA83XX(ha) || IS_QLA27XX(ha))
cnt = RD_REG_DWORD(&reg->isp25mq.req_q_out);
else if (IS_P3P_TYPE(ha))
cnt = RD_REG_DWORD(&reg->isp82.req_q_out);
--
2.12.0