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| author | David Wragg <david@weave.works> | 2016-02-10 00:05:58 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-10 05:50:03 -0500 |
| commit | 7e059158d57b79159eaf1f504825d19866ef2c42 (patch) | |
| tree | 08f87eb3b0e08a48203e1ec95b2ddd00b91ca412 /include/net/ip_tunnels.h | |
| parent | 55e5bfb53cff286c1c1ff49f51325dc15c7fea63 (diff) | |
| download | lwn-7e059158d57b79159eaf1f504825d19866ef2c42.tar.gz lwn-7e059158d57b79159eaf1f504825d19866ef2c42.zip | |
vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices
Prior to 4.3, openvswitch tunnel vports (vxlan, gre and geneve) could
transmit vxlan packets of any size, constrained only by the ability to
send out the resulting packets. 4.3 introduced netdevs corresponding
to tunnel vports. These netdevs have an MTU, which limits the size of
a packet that can be successfully encapsulated. The default MTU
values are low (1500 or less), which is awkwardly small in the context
of physical networks supporting jumbo frames, and leads to a
conspicuous change in behaviour for userspace.
Instead, set the MTU on openvswitch-created netdevs to be the relevant
maximum (i.e. the maximum IP packet size minus any relevant overhead),
effectively restoring the behaviour prior to 4.3.
Signed-off-by: David Wragg <david@weave.works>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip_tunnels.h')
| -rw-r--r-- | include/net/ip_tunnels.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 6db96ea0144f..dda9abf6b89c 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -230,6 +230,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, u8 *protocol, struct flowi4 *fl4); +int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, |