netdev - Re: [PATCH net-next 0/2] net: bridge: allow user-space to add ext learned entries

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Message-ID: <df54a306-debc-5c90-e0f1-b06fdf15f424@cumulusnetworks.com>
Date:   Thu, 23 Mar 2017 14:48:35 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     idosch@...lanox.com, jiri@...nulli.us, stephen@...workplumber.org,
        bridge@...ts.linux-foundation.org, roopa@...ulusnetworks.com,
        davem@...emloft.net
Subject: Re: [PATCH net-next 0/2] net: bridge: allow user-space to add ext
 learned entries

On 23/03/17 12:27, Nikolay Aleksandrov wrote:
> Hi,
> This set adds the ability to add externally learned entries from
> user-space. For symmetry and proper function we need to allow SW entries
> to take over HW learned ones (similar to how HW can take over SW entries
> currently) which is needed for our use case (evpn) where we have pure SW
> ports and HW ports mixed in a single bridge. This does not play well with
> switchdev devices currently because there's no feedback when the entry is
> taken over, but this case has never worked anyway and feedback can be
> easily added when needed.
> Patch 02 simply allows to use NTF_EXT_LEARNED from user-space, we already
> have Quagga patches that make use of this functionality.
> 
> Thanks,
>  Nik
> 

A minor clarification: the functionality is necessary so the aging can
be handled by user-space software (e.g. quagga w/ evpn) when the entry
has been learned externally, but can also dynamically move to a local
bridge port and then the aging should be done by the bridge.