net: Add vxlan_gso_check() helper (23e62de3) · Commits · 戴 / test

Most NICs that report NETIF_F_GSO_UDP_TUNNEL support VXLAN, and not other UDP-based encapsulation protocols where the format and size of the header differs. This patch implements a generic ndo_gso_check() for VXLAN which will only advertise GSO support when the skb looks like it contains VXLAN (or no UDP tunnelling at all). Implementation shamelessly stolen from Tom Herbert: http://thread.gmane.org/gmane.linux.network/332428/focus=333111 Signed-off-by:

Joe Stringer <joestringer@nicira.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -1571,6 +1571,19 @@ static bool route_shortcircuit(struct net_device dev, struct sk_buff skb)
		return false;
		}

		bool vxlan_gso_check(struct sk_buff *skb)
		{
		if ((skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) &&
		(skb->inner_protocol_type != ENCAP_TYPE_ETHER \|\|
		skb->inner_protocol != htons(ETH_P_TEB) \|\|
		(skb_inner_mac_header(skb) - skb_transport_header(skb) !=
		sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
		return false;

		return true;
		}
		EXPORT_SYMBOL_GPL(vxlan_gso_check);

		#if IS_ENABLED(CONFIG_IPV6)
		static int vxlan6_xmit_skb(struct vxlan_sock *vs,
		struct dst_entry dst, struct sk_buff skb,

include/net/vxlan.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,8 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
		__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
		__be16 src_port, __be16 dst_port, __be32 vni, bool xnet);

		bool vxlan_gso_check(struct sk_buff *skb);

		/* IP header + UDP + VXLAN + Ethernet header */
		#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
		/* IPv6 header + UDP + VXLAN + Ethernet header */

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