bnx2x: Use NETIF_F_GRO_HW.

Advertise NETIF_F_GRO_HW and turn on TPA_MODE_GRO when NETIF_F_GRO_HW
is set.  Disable NETIF_F_GRO_HW in bnx2x_fix_features() if the MTU
does not support TPA_MODE_GRO or GRO is not set.  bnx2x_change_mtu() also
needs to disable NETIF_F_GRO_HW if the MTU does not support it.

Original parameter disable_tpa will continue to disable LRO and GRO_HW.

Preserve the original behavior of enabling LRO by default.  User has
to run ethtool -K to explicitly enable GRO_HW.

Cc: Ariel Elior <Ariel.Elior@cavium.com>
Cc: everest-linux-l2@cavium.com
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Acked-by: Manish Chopra <manish.chopra@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c

@@ -2482,8 +2482,7 @@ static void bnx2x_bz_fp(struct bnx2x *bp, int index)
 	 */
 	if (bp->dev->features & NETIF_F_LRO)
 		fp->mode = TPA_MODE_LRO;
-	else if (bp->dev->features & NETIF_F_GRO &&
-		 bnx2x_mtu_allows_gro(bp->dev->mtu))
+	else if (bp->dev->features & NETIF_F_GRO_HW)
 		fp->mode = TPA_MODE_GRO;
 	else
 		fp->mode = TPA_MODE_DISABLED;
@@ -4874,6 +4873,9 @@ int bnx2x_change_mtu(struct net_device *dev, int new_mtu)
 	 */
 	dev->mtu = new_mtu;
 
+	if (!bnx2x_mtu_allows_gro(new_mtu))
+		dev->features &= ~NETIF_F_GRO_HW;
+
 	if (IS_PF(bp) && SHMEM2_HAS(bp, curr_cfg))
 		SHMEM2_WR(bp, curr_cfg, CURR_CFG_MET_OS);
 
@@ -4903,10 +4905,13 @@ netdev_features_t bnx2x_fix_features(struct net_device *dev,
 	}
 
 	/* TPA requires Rx CSUM offloading */
-	if (!(features & NETIF_F_RXCSUM)) {
+	if (!(features & NETIF_F_RXCSUM))
+		features &= ~NETIF_F_LRO;
+
+	if (!(features & NETIF_F_GRO) || !bnx2x_mtu_allows_gro(dev->mtu))
+		features &= ~NETIF_F_GRO_HW;
+	if (features & NETIF_F_GRO_HW)
 		features &= ~NETIF_F_LRO;
-		features &= ~NETIF_F_GRO;
-	}
 
 	return features;
 }
@@ -4933,13 +4938,8 @@ int bnx2x_set_features(struct net_device *dev, netdev_features_t features)
 		}
 	}
 
-	/* if GRO is changed while LRO is enabled, don't force a reload */
-	if ((changes & NETIF_F_GRO) && (features & NETIF_F_LRO))
-		changes &= ~NETIF_F_GRO;
-
-	/* if GRO is changed while HW TPA is off, don't force a reload */
-	if ((changes & NETIF_F_GRO) && bp->disable_tpa)
-		changes &= ~NETIF_F_GRO;
+	/* Don't care about GRO changes */
+	changes &= ~NETIF_F_GRO;
 
 	if (changes)
 		bnx2x_reload = true;

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

@@ -12400,8 +12400,8 @@ static int bnx2x_init_bp(struct bnx2x *bp)
 
 	/* Set TPA flags */
 	if (bp->disable_tpa) {
-		bp->dev->hw_features &= ~NETIF_F_LRO;
-		bp->dev->features &= ~NETIF_F_LRO;
+		bp->dev->hw_features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
+		bp->dev->features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
 	}
 
 	if (CHIP_IS_E1(bp))
@@ -13273,7 +13273,7 @@ static int bnx2x_init_dev(struct bnx2x *bp, struct pci_dev *pdev,
 
 	dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6 |
-		NETIF_F_RXCSUM | NETIF_F_LRO | NETIF_F_GRO |
+		NETIF_F_RXCSUM | NETIF_F_LRO | NETIF_F_GRO | NETIF_F_GRO_HW |
 		NETIF_F_RXHASH | NETIF_F_HW_VLAN_CTAG_TX;
 	if (!chip_is_e1x) {
 		dev->hw_features |= NETIF_F_GSO_GRE | NETIF_F_GSO_GRE_CSUM |
@@ -13309,6 +13309,8 @@ static int bnx2x_init_dev(struct bnx2x *bp, struct pci_dev *pdev,
 
 	dev->features |= dev->hw_features | NETIF_F_HW_VLAN_CTAG_RX;
 	dev->features |= NETIF_F_HIGHDMA;
+	if (dev->features & NETIF_F_LRO)
+		dev->features &= ~NETIF_F_GRO_HW;
 
 	/* Add Loopback capability to the device */
 	dev->hw_features |= NETIF_F_LOOPBACK;