[PATCH AUTOSEL for 3.18 59/63] veth: set peer GSO values

[Sasha Levin]

From: Stephen Hemminger <step...@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 <sthem...@microsoft.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@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 32ce1cd64d51..b6b322828549 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -382,6 +382,9 @@ 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