linux-kernel - Re: dropped packets with bonding and 8021q

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Date:	Thu, 27 Aug 2009 15:22:55 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Michael Walle <michael@...le.cc>,
	NetDEV list <netdev@...r.kernel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: dropped packets with bonding and 8021q

Forwarding to the networking mailing list

On Wed, Aug 19, 2009 at 3:29 AM, Michael Walle<michael@...le.cc> wrote:
>
> Hi,
>
> i have some strange bonding and vlan configuration. The bonding interface
> is in active-standby mode and i want to send and receive raw ethernet
> frames on _both_ enslaved interfaces. Additionally the frames are tagged
> with a vlan id. So one config could be:
>
> # modprobe bonding mode=1
> # modprobe 8021q
> # ifenslave bond0 eth1
> # ifenslave bond0 eth2
> # vconfig add eth1 10
> # vconfig add eth2 20
> # vconfig add bond0 1000
>
> # [activate bonding active slave etc..]
>
> I use raw/dgram sockets (AF_PACKET) with eth1.10 and eth2.20 (or dump the
> frames with tcpdump).
>
> As long as i don't use the bonding module everything works as expected.
> But if the physical interfaces are enslaved, frames received on the
> standby device will be dropped.
>
> The network driver is e1000. So the hardware acceleration for tagged VLAN
> frames gets used and the frame gets through __vlan_hwaccel_rx() in the
> receiving path. And there it seems to get dropped by
> skb_bond_should_drop().
>
> On the "normal" receive path there was a patch by Joe Eykholt that allows
> to receive frames on the physical interface even if it is enslaved and not
> active (git commit 0d7a3681232f545).
>
> Shouldn't __vlan_hwaccel_rx() (in net/8021q/vlan_core.c) be patched in the
> same way to allow reception on inactive enslaved interfaces?
>
> Thanks,
>  Michael
>
> PS. could you please cc me, as i'm not subscribed to the ml.
>
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