netdev - Re: MACVLANs really best solution? How about a bridge with multiple bridge virtual interfaces?

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Message-ID: <m17i2y5rbw.fsf@fess.ebiederm.org>
Date:	Mon, 09 Mar 2009 14:17:23 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Ben Greear <greearb@...delatech.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Mark Smith 
	<nanog@...5b20a518b8f6864949bd940457dc124746ddc.nosense.org>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	shemminger@...ux-foundation.org
Subject: Re: MACVLANs really best solution? How about a bridge with multiple bridge virtual interfaces?

Ben Greear <greearb@...delatech.com> writes:

> Patrick McHardy wrote:
>
>>> Now that I think about it we could call ndo_start_xmit directly
>>> from the macvlan code, and bypass whatever hook we use to
>>> intercept packets going out the normal device it should not
>>> be too difficult.
>>
>> We don't intercept packets on TX, they have to be explicitly delivered
>> to macvlan.
>
> It might suck for performance, but mac-vlan could register an 'ALL' protocol
> on the physical dev, similar to tcp-dump, to grab pkts on tx and pass the
> ones it cares about back up to the vlans?

I like that idea.  At least for prototyping.

I wonder if pkt_type all could be have a per interface optimized variant.

> I'd want run-time control to disable any of these costly options for those that
> don't need it, however.

If well implemented it should not be more expensive than the ingress path where
we already have, and where we already do that.  Unless your traffic is highly
assymmetric.

Eric
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