fm10k: Implement ndo_features_check

The introduction of ndo_features_check allows drivers to report their
offload capabilities per-skb. Implement this in fm10k to take advantage
of this new functionality.

Reported-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/fm10k/fm10k.h

@@ -439,6 +439,7 @@ extern char fm10k_driver_name[];
 extern const char fm10k_driver_version[];
 int fm10k_init_queueing_scheme(struct fm10k_intfc *interface);
 void fm10k_clear_queueing_scheme(struct fm10k_intfc *interface);
+__be16 fm10k_tx_encap_offload(struct sk_buff *skb);
 netdev_tx_t fm10k_xmit_frame_ring(struct sk_buff *skb,
 				  struct fm10k_ring *tx_ring);
 void fm10k_tx_timeout_reset(struct fm10k_intfc *interface);

drivers/net/ethernet/intel/fm10k/fm10k_main.c

@@ -718,7 +718,7 @@ static struct ethhdr *fm10k_gre_is_nvgre(struct sk_buff *skb)
 	return (struct ethhdr *)(&nvgre_hdr->tni);
 }
 
-static __be16 fm10k_tx_encap_offload(struct sk_buff *skb)
+__be16 fm10k_tx_encap_offload(struct sk_buff *skb)
 {
 	u8 l4_hdr = 0, inner_l4_hdr = 0, inner_l4_hlen;
 	struct ethhdr *eth_hdr;

drivers/net/ethernet/intel/fm10k/fm10k_netdev.c

@@ -1350,6 +1350,16 @@ static void fm10k_dfwd_del_station(struct net_device *dev, void *priv)
 	}
 }
 
+static netdev_features_t fm10k_features_check(struct sk_buff *skb,
+					      struct net_device *dev,
+					      netdev_features_t features)
+{
+	if (!skb->encapsulation || fm10k_tx_encap_offload(skb))
+		return features;
+
+	return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
+}
+
 static const struct net_device_ops fm10k_netdev_ops = {
 	.ndo_open		= fm10k_open,
 	.ndo_stop		= fm10k_close,
@@ -1372,6 +1382,7 @@ static const struct net_device_ops fm10k_netdev_ops = {
 	.ndo_do_ioctl		= fm10k_ioctl,
 	.ndo_dfwd_add_station	= fm10k_dfwd_add_station,
 	.ndo_dfwd_del_station	= fm10k_dfwd_del_station,
+	.ndo_features_check	= fm10k_features_check,
 };
 
 #define DEFAULT_DEBUG_LEVEL_SHIFT 3