[PATCH AUTOSEL for 4.9 209/219] veth: set peer GSO values

Sasha Levin
2018-03-03T23:27:37Z

From: Stephen Hemminger <stephen@networkplumber.org>

[ Upstream commit 72d24955b44a4039db54a1c252b5031969eeaac3 ]

When new veth is created, and GSO values have been configured
on one device, clone those values to the peer.

For example:
# ip link add dev vm1 gso_max_size 65530 type veth peer name vm2

This should create vm1 <--> vm2 with both having GSO maximum
size set to 65530.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/net/veth.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index fbc853e64531..ee7460ee3d05 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -425,6 +425,9 @@ static int veth_newlink(struct net *src_net, struct net_device *dev,
if (ifmp && (dev->ifindex != 0))
peer->ifindex = ifmp->ifi_index;

+ peer->gso_max_size = dev->gso_max_size;
+ peer->gso_max_segs = dev->gso_max_segs;
+
err = register_netdevice(peer);
put_net(net);
net = NULL;
--
2.14.1