scsi: qla2xxx: Disable ATIO interrupt coalesce for quad port ISP27XX

This partially reverts commit d2b292c3f6fd ("scsi: qla2xxx: Enable ATIO
interrupt handshake for ISP27XX")

For some workloads where the host sends a batch of commands and then
pauses, ATIO interrupt coalesce can cause some incoming ATIO entries to be
ignored for extended periods of time, resulting in slow performance,
timeouts, and aborted commands.

Disable interrupt coalesce and re-enable the dedicated ATIO MSI-X
interrupt.

Link: https://lore.kernel.org/r/97dcf365-89ff-014d-a3e5-1404c6af511c@cybernetics.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 2b2f682..62666df 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -6935,14 +6935,8 @@ qlt_24xx_config_rings(struct scsi_qla_host *vha)
 
        if (ha->flags.msix_enabled) {
                if (IS_QLA83XX(ha) || IS_QLA27XX(ha) || IS_QLA28XX(ha)) {
-                       if (IS_QLA2071(ha)) {
-                               /* 4 ports Baker: Enable Interrupt Handshake */
-                               icb->msix_atio = 0;
-                               icb->firmware_options_2 |= cpu_to_le32(BIT_26);
-                       } else {
-                               icb->msix_atio = cpu_to_le16(msix->entry);
-                               icb->firmware_options_2 &= cpu_to_le32(~BIT_26);
-                       }
+                       icb->msix_atio = cpu_to_le16(msix->entry);
+                       icb->firmware_options_2 &= cpu_to_le32(~BIT_26);
                        ql_dbg(ql_dbg_init, vha, 0xf072,
                            "Registering ICB vector 0x%x for atio que.\n",
                            msix->entry);