enic: Add vxlan offload support for IPv6 pkts

New adaptors supports vxlan offload for inner IPv6 and outer IPv6 vxlan
pkts.

Fw sets BIT(0) & BIT(1) in a1 if hw supports ipv6 inner & outer pkt
offload.
Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cisco/enic/enic.h

@@ -140,6 +140,7 @@ struct enic_rfs_flw_tbl {
 struct vxlan_offload {
 	u16 vxlan_udp_port_number;
 	u8 patch_level;
+	u8 flags;
 };
 
 /* Per-instance private data structure */

drivers/net/ethernet/cisco/enic/enic_main.c

@@ -191,10 +191,18 @@ static void enic_udp_tunnel_add(struct net_device *netdev,
 		goto error;
 	}
 
-	if (ti->sa_family != AF_INET) {
+	switch (ti->sa_family) {
+	case AF_INET6:
+		if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6)) {
 			netdev_info(netdev, "vxlan: only IPv4 offload supported");
 			goto error;
 		}
+		/* Fall through */
+	case AF_INET:
+		break;
+	default:
+		goto error;
+	}
 
 	if (enic->vxlan.vxlan_udp_port_number) {
 		if (ntohs(port) == enic->vxlan.vxlan_udp_port_number)
@@ -271,22 +279,37 @@ static netdev_features_t enic_features_check(struct sk_buff *skb,
 	struct enic *enic = netdev_priv(dev);
 	struct udphdr *udph;
 	u16 port = 0;
-	u16 proto;
+	u8 proto;
 
 	if (!skb->encapsulation)
 		return features;
 
 	features = vxlan_features_check(skb, features);
 
-	/* hardware only supports IPv4 vxlan tunnel */
-	if (vlan_get_protocol(skb) != htons(ETH_P_IP))
+	switch (vlan_get_protocol(skb)) {
+	case htons(ETH_P_IPV6):
+		if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6))
+			goto out;
+		proto = ipv6_hdr(skb)->nexthdr;
+		break;
+	case htons(ETH_P_IP):
+		proto = ip_hdr(skb)->protocol;
+		break;
+	default:
 		goto out;
+	}
 
-	/* hardware does not support offload of ipv6 inner pkt */
-	if (eth->h_proto != ntohs(ETH_P_IP))
+	switch (eth->h_proto) {
+	case ntohs(ETH_P_IPV6):
+		if (!(enic->vxlan.flags & ENIC_VXLAN_INNER_IPV6))
 			goto out;
+		/* Fall through */
+	case ntohs(ETH_P_IP):
+		break;
+	default:
+		goto out;
+	}
 
-	proto = ip_hdr(skb)->protocol;
 
 	if (proto == IPPROTO_UDP) {
 		udph = udp_hdr(skb);
@@ -2914,9 +2937,11 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		netdev->hw_features |= NETIF_F_RXCSUM;
 	if (ENIC_SETTING(enic, VXLAN)) {
 		u64 patch_level;
+		u64 a1 = 0;
 
 		netdev->hw_enc_features |= NETIF_F_RXCSUM		|
 					   NETIF_F_TSO			|
+					   NETIF_F_TSO6			|
 					   NETIF_F_TSO_ECN		|
 					   NETIF_F_GSO_UDP_TUNNEL	|
 					   NETIF_F_HW_CSUM		|
@@ -2935,9 +2960,10 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		 */
 		err = vnic_dev_get_supported_feature_ver(enic->vdev,
 							 VIC_FEATURE_VXLAN,
-							 &patch_level);
+							 &patch_level, &a1);
 		if (err)
 			patch_level = 0;
+		enic->vxlan.flags = (u8)a1;
 		/* mask bits that are supported by driver
 		 */
 		patch_level &= BIT_ULL(0) | BIT_ULL(2);

drivers/net/ethernet/cisco/enic/vnic_dev.c

@@ -1269,14 +1269,13 @@ int vnic_dev_overlay_offload_cfg(struct vnic_dev *vdev, u8 overlay,
 }
 
 int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
-				       u64 *supported_versions)
+				       u64 *supported_versions, u64 *a1)
 {
 	u64 a0 = feature;
 	int wait = 1000;
-	u64 a1 = 0;
 	int ret;
 
-	ret = vnic_dev_cmd(vdev, CMD_GET_SUPP_FEATURE_VER, &a0, &a1, wait);
+	ret = vnic_dev_cmd(vdev, CMD_GET_SUPP_FEATURE_VER, &a0, a1, wait);
 	if (!ret)
 		*supported_versions = a0;
 

drivers/net/ethernet/cisco/enic/vnic_dev.h

@@ -183,6 +183,6 @@ int vnic_dev_overlay_offload_ctrl(struct vnic_dev *vdev, u8 overlay, u8 config);
 int vnic_dev_overlay_offload_cfg(struct vnic_dev *vdev, u8 overlay,
 				 u16 vxlan_udp_port_number);
 int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
-				       u64 *supported_versions);
+				       u64 *supported_versions, u64 *a1);
 
 #endif /* _VNIC_DEV_H_ */

drivers/net/ethernet/cisco/enic/vnic_devcmd.h

@@ -697,6 +697,9 @@ enum overlay_ofld_cmd {
 
 #define OVERLAY_CFG_VXLAN_PORT_UPDATE	0
 
+#define ENIC_VXLAN_INNER_IPV6		BIT(0)
+#define ENIC_VXLAN_OUTER_IPV6		BIT(1)
+
 /* Use this enum to get the supported versions for each of these features
  * If you need to use the devcmd_get_supported_feature_version(), add
  * the new feature into this enum and install function handler in devcmd.c