bnx2x: add fan failure event handling

Shut down the device in case of fan failure to prevent HW damage.
Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x.h

@@ -1141,6 +1141,7 @@ struct bnx2x_fw_stats_data {
 enum {
 	BNX2X_SP_RTNL_SETUP_TC,
 	BNX2X_SP_RTNL_TX_TIMEOUT,
+	BNX2X_SP_RTNL_FAN_FAILURE,
 };
 
 
@@ -2048,6 +2049,8 @@ static inline u32 reg_poll(struct bnx2x *bp, u32 reg, u32 expected, int ms,
 #define BNX2X_VPD_LEN			128
 #define VENDOR_ID_LEN			4
 
+int bnx2x_close(struct net_device *dev);
+
 /* Congestion management fairness mode */
 #define CMNG_FNS_NONE		0
 #define CMNG_FNS_MINMAX		1

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -3299,6 +3299,17 @@ static inline void bnx2x_fan_failure(struct bnx2x *bp)
 	netdev_err(bp->dev, "Fan Failure on Network Controller has caused"
 	       " the driver to shutdown the card to prevent permanent"
 	       " damage.  Please contact OEM Support for assistance\n");
+
+	/*
+	 * Scheudle device reset (unload)
+	 * This is due to some boards consuming sufficient power when driver is
+	 * up to overheat if fan fails.
+	 */
+	smp_mb__before_clear_bit();
+	set_bit(BNX2X_SP_RTNL_FAN_FAILURE, &bp->sp_rtnl_state);
+	smp_mb__after_clear_bit();
+	schedule_delayed_work(&bp->sp_rtnl_task, 0);
+
 }
 
 static inline void bnx2x_attn_int_deasserted0(struct bnx2x *bp, u32 attn)
@@ -8503,6 +8514,17 @@ static void bnx2x_sp_rtnl_task(struct work_struct *work)
 	if (test_and_clear_bit(BNX2X_SP_RTNL_SETUP_TC, &bp->sp_rtnl_state))
 		bnx2x_setup_tc(bp->dev, bp->dcbx_port_params.ets.num_of_cos);
 
+	/*
+	 * in case of fan failure we need to reset id if the "stop on error"
+	 * debug flag is set, since we trying to prevent permanent overheating
+	 * damage
+	 */
+	if (test_and_clear_bit(BNX2X_SP_RTNL_FAN_FAILURE, &bp->sp_rtnl_state)) {
+		DP(BNX2X_MSG_SP, "fan failure detected. Unloading driver");
+		netif_device_detach(bp->dev);
+		bnx2x_close(bp->dev);
+	}
+
 sp_rtnl_exit:
 	rtnl_unlock();
 }
@@ -9969,7 +9991,7 @@ static int bnx2x_open(struct net_device *dev)
 }
 
 /* called with rtnl_lock */
-static int bnx2x_close(struct net_device *dev)
+int bnx2x_close(struct net_device *dev)
 {
 	struct bnx2x *bp = netdev_priv(dev);