netdev - Re: [PATCH net-next 1/1] ipvlan: Initial check-in of the IPVLAN driver.

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Message-ID: <CAHA+R7MgjOKuVY_egNz2SOWZG6X2rkFGfcaP0PiMKc_YVKAULA@mail.gmail.com>
Date:	Tue, 11 Nov 2014 16:39:55 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Hannes Frederic Sowa <hannes@...hat.com>
Cc:	Mahesh Bandewar <maheshb@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Maciej Zenczykowski <maze@...gle.com>,
	Laurent Chavey <chavey@...gle.com>,
	Tim Hockin <thockin@...gle.com>,
	David Miller <davem@...emloft.net>,
	Brandon Philips <brandon.philips@...eos.com>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: [PATCH net-next 1/1] ipvlan: Initial check-in of the IPVLAN driver.

On Tue, Nov 11, 2014 at 3:22 PM, Hannes Frederic Sowa <hannes@...hat.com> wrote:
> On Di, 2014-11-11 at 15:12 -0800, Cong Wang wrote:
>> On Tue, Nov 11, 2014 at 2:29 PM, Mahesh Bandewar <maheshb@...gle.com> wrote:
>> > This driver is very similar to the macvlan driver except that it
>> > uses L3 on the frame to determine the logical interface while
>> > functioning as packet dispatcher. It inherits L2 of the master
>> > device hence the packets on wire will have the same L2 for all
>> > the packets originating from all virtual devices off of the same
>> > master device.
>>
>> Why do we need this from the beginning?
>> IOW, what problem does this solve while macvlan doesn't?
>
> I think it is good to reduce the number of mac addresses before a NIC
> switches into promisc mode.
>

Sounds like over-kill to have a new device just for not worrying about mac.
Or you mean our neigh table doesn't scale?
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