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scsi: qla2xxx: Use shadow register for ISP27XX 

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>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2017-12-28 12:33:18 -08:00 committed by Martin K. Petersen
parent d2b292c3f6
commit 1586e07a46
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/qla2xxx/qla_iocb.c
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@ -2158,7 +2158,9 @@ __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);