diff options
| author | David Wragg <david@weave.works> | 2016-02-10 00:05:57 +0000 |
|---|---|---|
| committer | Joe Stringer <joe@ovn.org> | 2016-02-19 11:11:44 -0800 |
| commit | ef1d4fc0dde112418d97ae93dee419fc8db0eeaa (patch) | |
| tree | 2e4ed8fa81c3ac64336da6ed32ab153aa04942a3 /datapath/linux/compat/geneve.c | |
| parent | 27e39e3e9f9d628ee80c321e8876b2595f7a8be2 (diff) | |
| download | openvswitch-ef1d4fc0dde112418d97ae93dee419fc8db0eeaa.tar.gz | |
datapath: geneve: Relax MTU constraints.
Upstream commit:
Allow the MTU of geneve devices to be set to large values, in order to
exploit underlying networks with larger frame sizes.
GENEVE does not have a fixed encapsulation overhead (an openvswitch
rule can add variable length options), so there is no relevant maximum
MTU to enforce. A maximum of IP_MAX_MTU is used instead.
Encapsulated packets that are too big for the underlying network will
get dropped on the floor.
Signed-off-by: David Wragg <david@weave.works>
Signed-off-by: David S. Miller <davem@davemloft.net>
Upstream: 55e5bfb53cff ("geneve: Relax MTU constraints")
Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Jesse Gross <jesse@kernel.org>
Diffstat (limited to 'datapath/linux/compat/geneve.c')
| -rw-r--r-- | datapath/linux/compat/geneve.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/datapath/linux/compat/geneve.c b/datapath/linux/compat/geneve.c index 297593ce6..29a65a0a4 100644 --- a/datapath/linux/compat/geneve.c +++ b/datapath/linux/compat/geneve.c @@ -742,6 +742,17 @@ static netdev_tx_t geneve_dev_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; } +static int geneve_change_mtu(struct net_device *dev, int new_mtu) +{ + /* GENEVE overhead is not fixed, so we can't enforce a more + * precise max MTU. + */ + if (new_mtu < 68 || new_mtu > IP_MAX_MTU) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + static const struct net_device_ops geneve_netdev_ops = { #ifdef HAVE_DEV_TSTATS .ndo_init = geneve_init, @@ -751,7 +762,7 @@ static const struct net_device_ops geneve_netdev_ops = { .ndo_open = geneve_open, .ndo_stop = geneve_stop, .ndo_start_xmit = geneve_dev_xmit, - .ndo_change_mtu = eth_change_mtu, + .ndo_change_mtu = geneve_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = eth_mac_addr, }; |