scsi: qla2xxx: Fix IOPS drop seen in some adapters

Removing the response queue processing in the send path is showing IOPS
drop. Add back the process_response_queue() call in the send path.

Link: https://lore.kernel.org/r/20210329085229.4367-2-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index c89e6d0..fea3a92 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -1600,12 +1600,14 @@ qla24xx_start_scsi(srb_t *sp)
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct req_que *req = NULL;
+       struct rsp_que *rsp;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host *vha = sp->vha;
        struct qla_hw_data *ha = vha->hw;
 
        /* Setup device pointers. */
        req = vha->req;
+       rsp = req->rsp;
 
        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;
@@ -1707,6 +1709,11 @@ qla24xx_start_scsi(srb_t *sp)
        /* Set chip new ring index. */
        wrt_reg_dword(req->req_q_in, req->ring_index);
 
+       /* Manage unprocessed RIO/ZIO commands in response queue. */
+       if (vha->flags.process_response_queue &&
+           rsp->ring_ptr->signature != RESPONSE_PROCESSED)
+               qla24xx_process_response_queue(vha, rsp);
+
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return QLA_SUCCESS;
 
@@ -1897,6 +1904,11 @@ qla24xx_dif_start_scsi(srb_t *sp)
        /* Set chip new ring index. */
        wrt_reg_dword(req->req_q_in, req->ring_index);
 
+       /* Manage unprocessed RIO/ZIO commands in response queue. */
+       if (vha->flags.process_response_queue &&
+           rsp->ring_ptr->signature != RESPONSE_PROCESSED)
+               qla24xx_process_response_queue(vha, rsp);
+
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
        return QLA_SUCCESS;
@@ -1931,6 +1943,7 @@ qla2xxx_start_scsi_mq(srb_t *sp)
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct req_que *req = NULL;
+       struct rsp_que *rsp;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host *vha = sp->fcport->vha;
        struct qla_hw_data *ha = vha->hw;
@@ -1941,6 +1954,7 @@ qla2xxx_start_scsi_mq(srb_t *sp)
 
        /* Setup qpair pointers */
        req = qpair->req;
+       rsp = qpair->rsp;
 
        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;
@@ -2041,6 +2055,11 @@ qla2xxx_start_scsi_mq(srb_t *sp)
        /* Set chip new ring index. */
        wrt_reg_dword(req->req_q_in, req->ring_index);
 
+       /* Manage unprocessed RIO/ZIO commands in response queue. */
+       if (vha->flags.process_response_queue &&
+           rsp->ring_ptr->signature != RESPONSE_PROCESSED)
+               qla24xx_process_response_queue(vha, rsp);
+
        spin_unlock_irqrestore(&qpair->qp_lock, flags);
        return QLA_SUCCESS;