netdev - Re: [next] bonding: pass link-local packets to bonding master also.

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Date:   Thu, 20 Dec 2018 06:55:45 +0100
From:   Vincent Bernat <vincent@...nat.ch>
To:     Michal Soltys <soltys@....info>
Cc:     Mahesh Bandewar <mahesh@...dewar.net>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Veaceslav Falico <vfalico@...il.com>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Chonggang Li <chonggangli@...gle.com>
Subject: Re: [next] bonding: pass link-local packets to bonding master also.

 ❦ 19 décembre 2018 23:57 +01, Michal Soltys <soltys@....info>:

>>> Commit b89f04c61efe ("bonding: deliver link-local packets with
>>> skb->dev set to link that packets arrived on") changed the behavior
>>> of how link-local-multicast packets are processed. The change in
>>> the behavior broke some legacy use cases where these packets are
>>> expected to arrive on bonding master device also.
>> 
>> Unfortunately, this doesn't completely restore the previous
>> functionality as PACKET_ORIGDEV is broken for the copy: the original
>> interface is lost through the call to netif_rx(). A LLDP daemon
>> listening to the master interface won't get the original interface like
>> it was able to before 4.12.
>> 
>> I am a bit lost of what the original patch was trying to achieve. I am
>> using the following test program:
>> 
>
> Basing on what you wrote below, it seems that everything was already
> possible before the Chonggang Li's commit ?
>
> If I understand correctly:
>
> - if listening on master, you could get both slave interface
> (PACKET_ORIGDEV) as well as bonding master
> - if listening on slave, you would just get the slave interface
>
> Right ?

Yes. This has been this way since 2.6.27.
-- 
Test programs at their boundary values.
            - The Elements of Programming Style (Kernighan & Plauger)