netdev - Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding performance vs Core/RSS number / HT on

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Date:   Mon, 14 Aug 2017 18:17:29 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding
 performance vs Core/RSS number / HT on

On Mon, 2017-08-14 at 18:07 -0700, Eric Dumazet wrote:

> Or try to hack the IFF_XMIT_DST_RELEASE flag on the vlan netdev.

Something like :

diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 5e831de3103e2f7092c7fa15534def403bc62fb4..9472de846d5c0960996261cb2843032847fa4bf7 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -143,6 +143,7 @@ static int vlan_newlink(struct net *src_net, struct net_device *dev,
 	vlan->vlan_proto = proto;
 	vlan->vlan_id	 = nla_get_u16(data[IFLA_VLAN_ID]);
 	vlan->real_dev	 = real_dev;
+	dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 	vlan->flags	 = VLAN_FLAG_REORDER_HDR;
 
 	err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);