[SCSI] qla4xxx: Disable generating pause frames in case of FW hung

In case of FW hung  ISP82xx generates continuous pause frames
which causes switch to disable port.
Added fix to disable generating pause frames in case of
FW hung

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 20 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index c2593782fbbe..e1e66a45e4d0 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -219,6 +219,13 @@ int qla4xxx_mailbox_command(struct scsi_qla_host *ha, uint8_t inCount,
                 ha->mailbox_timeout_count++;
                 mbx_sts[0] = (-1);
                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
+                if (is_qla8022(ha)) {
+                        ql4_printk(KERN_INFO, ha,
+                                   "disabling pause transmit on port 0 & 1.\n");
+                        qla4_8xxx_wr_32(ha, QLA82XX_CRB_NIU + 0x98,
+                                        CRB_NIU_XG_PAUSE_CTL_P0 |
+                                        CRB_NIU_XG_PAUSE_CTL_P1);
+                }
                 goto mbox_exit;
         }
 
diff --git a/drivers/scsi/qla4xxx/ql4_nx.h b/drivers/scsi/qla4xxx/ql4_nx.h
index cfb2f2edac3a..dc45ac923691 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.h
+++ b/drivers/scsi/qla4xxx/ql4_nx.h
@@ -39,6 +39,9 @@ enum {
         QLA82XX_TEMP_PANIC      /* Fatal error, hardware has shut down. */
 };
 
+#define CRB_NIU_XG_PAUSE_CTL_P0         0x1
+#define CRB_NIU_XG_PAUSE_CTL_P1         0x8
+
 #define QLA82XX_HW_H0_CH_HUB_ADR        0x05
 #define QLA82XX_HW_H1_CH_HUB_ADR        0x0E
 #define QLA82XX_HW_H2_CH_HUB_ADR        0x03
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 9d3eab513935..e2ef7762dc24 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -2080,6 +2080,11 @@ void qla4_8xxx_watchdog(struct scsi_qla_host *ha)
                 dev_state = qla4_8xxx_rd_32(ha, QLA82XX_CRB_DEV_STATE);
 
                 if (qla4_8xxx_check_temp(ha)) {
+                        ql4_printk(KERN_INFO, ha, "disabling pause"
+                                   " transmit on port 0 & 1.\n");
+                        qla4_8xxx_wr_32(ha, QLA82XX_CRB_NIU + 0x98,
+                                        CRB_NIU_XG_PAUSE_CTL_P0 |
+                                        CRB_NIU_XG_PAUSE_CTL_P1);
                         set_bit(DPC_HA_UNRECOVERABLE, &ha->dpc_flags);
                         qla4xxx_wake_dpc(ha);
                 } else if (dev_state == QLA82XX_DEV_NEED_RESET &&
@@ -2099,6 +2104,11 @@ void qla4_8xxx_watchdog(struct scsi_qla_host *ha)
                 } else  {
                         /* Check firmware health */
                         if (qla4_8xxx_check_fw_alive(ha)) {
+                                ql4_printk(KERN_INFO, ha, "disabling pause"
+                                           " transmit on port 0 & 1.\n");
+                                qla4_8xxx_wr_32(ha, QLA82XX_CRB_NIU + 0x98,
+                                                CRB_NIU_XG_PAUSE_CTL_P0 |
+                                                CRB_NIU_XG_PAUSE_CTL_P1);
                                 halt_status = qla4_8xxx_rd_32(ha,
                                                 QLA82XX_PEG_HALT_STATUS1);