From: Stephen Hemminger <[email protected]> Veth's can be used in environments (like Azure) where the underlying network device is impacted by large GSO packets. This patch allows gso maximum values to be passed in when creating the device via netlink.
In theory, other pseudo devices could also use netlink attributes to set GSO maximums but for now veth is what has been observed to be an issue. Signed-off-by: Stephen Hemminger <[email protected]> Signed-off-by: Solio Sarabia <[email protected]> --- drivers/net/veth.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index f5438d0..510c058 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -410,6 +410,26 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, if (ifmp && (dev->ifindex != 0)) peer->ifindex = ifmp->ifi_index; + if (tbp[IFLA_GSO_MAX_SIZE]) { + u32 max_size = nla_get_u32(tbp[IFLA_GSO_MAX_SIZE]); + + if (max_size > GSO_MAX_SIZE) + return -EINVAL; + + peer->gso_max_size = max_size; + dev->gso_max_size = max_size; + } + + if (tbp[IFLA_GSO_MAX_SEGS]) { + u32 max_segs = nla_get_u32(tbp[IFLA_GSO_MAX_SEGS]); + + if (max_segs > GSO_MAX_SEGS) + return -EINVAL; + + peer->gso_max_segs = max_segs; + dev->gso_max_segs = max_segs; + } + err = register_netdevice(peer); put_net(net); net = NULL; -- 2.7.4
