vxlan: expose COLLECT_METADATA flag to user space

Two vxlan driver flags FLOWBASED and COLLECT_METADATA need to be set to
make use of its new flow mode. The former already exposed. Expose the latter.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -2463,6 +2463,7 @@ static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
 	[IFLA_VXLAN_L2MISS]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_L3MISS]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_FLOWBASED]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_COLLECT_METADATA]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_PORT]	= { .type = NLA_U16 },
 	[IFLA_VXLAN_UDP_CSUM]	= { .type = NLA_U8 },
 	[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
@@ -2817,6 +2818,10 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
 	    nla_get_u8(data[IFLA_VXLAN_FLOWBASED]))
 		conf.flags |= VXLAN_F_FLOW_BASED;
 
+	if (data[IFLA_VXLAN_COLLECT_METADATA] &&
+	    nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
+		conf.flags |= VXLAN_F_COLLECT_METADATA;
+
 	if (data[IFLA_VXLAN_PORT_RANGE]) {
 		const struct ifla_vxlan_port_range *p
 			= nla_data(data[IFLA_VXLAN_PORT_RANGE]);

include/uapi/linux/if_link.h

@@ -383,6 +383,7 @@ enum {
 	IFLA_VXLAN_GBP,
 	IFLA_VXLAN_REMCSUM_NOPARTIAL,
 	IFLA_VXLAN_FLOWBASED,
+	IFLA_VXLAN_COLLECT_METADATA,
 	__IFLA_VXLAN_MAX
 };
 #define IFLA_VXLAN_MAX	(__IFLA_VXLAN_MAX - 1)