netdev - Re: [PATCH] net: VRF: Fix receiving multicast traffic

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Date:   Thu, 22 Sep 2016 22:10:36 +0000
From:   Mark Tomlinson <Mark.Tomlinson@...iedtelesis.co.nz>
To:     David Ahern <dsa@...ulusnetworks.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: VRF: Fix receiving multicast traffic


On 09/23/2016 03:14 AM, David Ahern wrote:
>
> l3mdev devices do not support IPv4 multicast so checking mcast against that device should not be working at all. For that reason I was fine with the change in the previous patch. ie., you want the real ingress device there not the vrf device.
>
> What test are you running that says your previous patch broke something?
Although we do not expect any multicast routing to work in an l3mdev, 
(IGMP snooping or PIM), we still want to have multicast packets 
delivered for protocols such as RIP. This was working before my previous 
patch, but these multicast packets are now dropped. This current patch 
fixes that again, hopefully still with the benefits of my first patch.