netdev - Re: Clarification regarding IFLA_BRPORT_LEARNING_SYNC and aging of fdb entries learnt via br_fdb_external_learn

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Date:	Wed, 7 Jan 2015 13:53:01 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Siva Mannem <siva.mannem.lnx@...il.com>
Cc:	netdev@...r.kernel.org, sfeldma@...il.com
Subject: Re: Clarification regarding IFLA_BRPORT_LEARNING_SYNC and aging of
 fdb entries learnt via br_fdb_external_learn_add()

Tue, Dec 30, 2014 at 07:20:21PM CET, siva.mannem.lnx@...il.com wrote:
>Hi,
>
>I am trying to understand the ongoing switch device offload effort and
>am following the discussions. I have a question regarding
>IFLA_BRPORT_LEARNING_SYNC flag and how aging happens when this flag is
>enabled on a port that is attached to a bridge that has vlan filtering
>enabled.
>
>If I understand correctly, when  IFLA_BRPORT_LEARNING_SYNC is set on a
>bridge port, fdb entries that are learnt externally(may be learnt by
>hardware and driver is notified) are synced to bridges fdb using
>br_fdb_external_learn_add(). The fdb
>entries(fdb->added_by_external_learn set to true) that are learnt via
>this method are also deleted by the aging logic after the aging time
>even though L2 data forwadring  happens in hardware. Is there a way
>where aging can be disabled for these entries? and let the entries be
>removed only via br_fdb_external_learn_delete()? or am I missing
>something?

Currently extenaly learned fdb entries are indeed removed during aging
cleanup. I believe that br_fdb_cleanup should check added_by_external_learn
and not remove that fdbs. What do you think Scott?
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