Commit 72564b59 authored by David Wragg's avatar David Wragg Committed by David S. Miller

vxlan: Relax MTU constraints

Allow the MTU of vxlan devices without an underlying device to be set
to larger values (up to a maximum based on IP packet limits and vxlan
overhead).

Previously, their MTUs could not be set to higher than the
conventional ethernet value of 1500.  This is a very arbitrary value
in the context of vxlan, and prevented vxlan devices from being able
to take advantage of jumbo frames etc.

The default MTU remains 1500, for compatibility.
Signed-off-by: default avatarDavid Wragg <david@weave.works>
Acked-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 461547f3
...@@ -2367,29 +2367,43 @@ static void vxlan_set_multicast_list(struct net_device *dev) ...@@ -2367,29 +2367,43 @@ static void vxlan_set_multicast_list(struct net_device *dev)
{ {
} }
static int vxlan_change_mtu(struct net_device *dev, int new_mtu) static int __vxlan_change_mtu(struct net_device *dev,
struct net_device *lowerdev,
struct vxlan_rdst *dst, int new_mtu, bool strict)
{ {
struct vxlan_dev *vxlan = netdev_priv(dev); int max_mtu = IP_MAX_MTU;
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev;
int max_mtu;
lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex); if (lowerdev)
if (lowerdev == NULL) max_mtu = lowerdev->mtu;
return eth_change_mtu(dev, new_mtu);
if (dst->remote_ip.sa.sa_family == AF_INET6) if (dst->remote_ip.sa.sa_family == AF_INET6)
max_mtu = lowerdev->mtu - VXLAN6_HEADROOM; max_mtu -= VXLAN6_HEADROOM;
else else
max_mtu = lowerdev->mtu - VXLAN_HEADROOM; max_mtu -= VXLAN_HEADROOM;
if (new_mtu < 68 || new_mtu > max_mtu) if (new_mtu < 68)
return -EINVAL; return -EINVAL;
if (new_mtu > max_mtu) {
if (strict)
return -EINVAL;
new_mtu = max_mtu;
}
dev->mtu = new_mtu; dev->mtu = new_mtu;
return 0; return 0;
} }
static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
dst->remote_ifindex);
return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
}
static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb, static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
struct ip_tunnel_info *info, struct ip_tunnel_info *info,
__be16 sport, __be16 dport) __be16 sport, __be16 dport)
......
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