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VXLAN: Support outer IPv4 Tx checksums by default 

This change makes it so that if UDP CSUM is not specified we will default
to enabling it.  The main motivation behind this is the fact that with the
use of outer checksum we can greatly improve the performance for VXLAN
tunnels on devices that don't know how to parse tunnel headers.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2016-02-19 11:26:31 -08:00 committed by David S. Miller
parent 14f1f72435
commit 6ceb31ca5f
2 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/vxlan.c
View File

@ -1957,13 +1957,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
goto drop;
sk = vxlan->vn4_sock->sock->sk;
if (info) {
if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
df = htons(IP_DF);
} else {
udp_sum = !!(flags & VXLAN_F_UDP_CSUM);
}
rt = vxlan_get_route(vxlan, skb,
rdst ? rdst->remote_ifindex : 0, tos,
dst->sin.sin_addr.s_addr, &saddr,
@ -1997,6 +1990,11 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
return;
}
if (!info)
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
df = htons(IP_DF);
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
@ -2898,8 +2896,9 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
if (data[IFLA_VXLAN_PORT])
conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
conf.flags |= VXLAN_F_UDP_CSUM;
if (data[IFLA_VXLAN_UDP_CSUM] &&
!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
@ -3043,7 +3042,7 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
!!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,

2
include/net/vxlan.h
View File

@ -197,7 +197,7 @@ struct vxlan_dev {
#define VXLAN_F_L2MISS 0x08
#define VXLAN_F_L3MISS 0x10
#define VXLAN_F_IPV6 0x20
#define VXLAN_F_UDP_CSUM 0x40
#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
#define VXLAN_F_REMCSUM_TX 0x200