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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Stephen Hemminger <stephen@networkplumber.org>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 3.18 59/63] veth: set peer GSO values
Thread-Topic: [PATCH AUTOSEL for 3.18 59/63] veth: set peer GSO values
Thread-Index: AQHTsz+yCdCajojKtk2zdlGCZHx0jA==
Date:   Sat, 3 Mar 2018 22:33:48 +0000
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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 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 !=3D 0))
 		peer->ifindex =3D ifmp->ifi_index;
=20
+	peer->gso_max_size =3D dev->gso_max_size;
+	peer->gso_max_segs =3D dev->gso_max_segs;
+
 	err =3D register_netdevice(peer);
 	put_net(net);
 	net =3D NULL;
--=20
2.14.1