[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: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NVikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

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;
 	}
 

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

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);