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vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices

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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>
This commit is contained in:
David Wragg
2016-02-10 00:05:58 +00:00
committed by David S. Miller
parent 55e5bfb53c
commit 7e059158d5
6 changed files with 50 additions and 10 deletions
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11
drivers/net/vxlan.c
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@@ -2779,6 +2779,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
int err;
bool use_ipv6 = false;
__be16 default_port = vxlan->cfg.dst_port;
struct net_device *lowerdev = NULL;
vxlan->net = src_net;
@@ -2799,9 +2800,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
}
if (conf->remote_ifindex) {
struct net_device *lowerdev
= __dev_get_by_index(src_net, conf->remote_ifindex);
lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
dst->remote_ifindex = conf->remote_ifindex;
if (!lowerdev) {
@@ -2825,6 +2824,12 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
needed_headroom = lowerdev->hard_header_len;
}
if (conf->mtu) {
err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
if (err)
return err;
}
if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
needed_headroom += VXLAN6_HEADROOM;
else