bnx2x: Allow ethtool to enable/disable loopback.

This patch updates the bnx2x_set_features() to handle loopback mode.
When enabled; it sets internal-MAC loopback.
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x/bnx2x_cmn.c

@@ -2840,15 +2840,31 @@ int bnx2x_set_features(struct net_device *dev, u32 features)
 {
 	struct bnx2x *bp = netdev_priv(dev);
 	u32 flags = bp->flags;
+	bool bnx2x_reload = false;
 
 	if (features & NETIF_F_LRO)
 		flags |= TPA_ENABLE_FLAG;
 	else
 		flags &= ~TPA_ENABLE_FLAG;
 
+	if (features & NETIF_F_LOOPBACK) {
+		if (bp->link_params.loopback_mode != LOOPBACK_BMAC) {
+			bp->link_params.loopback_mode = LOOPBACK_BMAC;
+			bnx2x_reload = true;
+		}
+	} else {
+		if (bp->link_params.loopback_mode != LOOPBACK_NONE) {
+			bp->link_params.loopback_mode = LOOPBACK_NONE;
+			bnx2x_reload = true;
+		}
+	}
+
 	if (flags ^ bp->flags) {
 		bp->flags = flags;
+		bnx2x_reload = true;
+	}
 
+	if (bnx2x_reload) {
 		if (bp->recovery_state == BNX2X_RECOVERY_DONE)
 			return bnx2x_reload_if_running(dev);
 		/* else: bnx2x_nic_load() will be called at end of recovery */

drivers/net/bnx2x/bnx2x_main.c

@@ -9273,6 +9273,9 @@ static int __devinit bnx2x_init_dev(struct pci_dev *pdev,
 	if (bp->flags & USING_DAC_FLAG)
 		dev->features |= NETIF_F_HIGHDMA;
 
+	/* Add Loopback capability to the device */
+	dev->hw_features |= NETIF_F_LOOPBACK;
+
 #ifdef BCM_DCBNL
 	dev->dcbnl_ops = &bnx2x_dcbnl_ops;
 #endif