netdev - Re: [RFC] bridge and friends: reduce TheLinuxWay(tm)

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Date:	Wed, 16 Oct 2013 13:11:11 -0400
From:	Vlad Yasevich <vyasevic@...hat.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>,
	Stephen Hemminger <stephen@...workplumber.org>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC] bridge and friends: reduce TheLinuxWay(tm)

On 10/16/2013 09:54 AM, Jamal Hadi Salim wrote:
> On 10/14/13 17:41, Stephen Hemminger wrote:
>
>> Unfortunately, by now this is all set in ABI.
>> It was a side effect of the per-feature evolutionary style of
>> development.
>
> Sadly, I agree. This is the dark side of "have code will travel";
> you let these things out in the wild, they breed and you cant
> take them back.
> BTW: I dont think what i suggested will be a harmful refactoring because
> no existing interfaces are removed - your call.
>
> In similar vein:
> What is the motivation behind IFLA_EXT_MASK?

This was to display or filter out virtual function data.

> Could you not have used
> ifm ifindex to relay the interface of interest? Currently the ifindex is
> not used at all. IMO, the following interfaces are useful:
> - get attributes for all bridge ports (this is there)
> - get attributes for bridge interface XXX; there using IFLA_EXT_MASK
> I think it should be using ifm->ifindex

I probably doesn't need to use this as we want the bridge data, not the 
VF data stored as part of PF interface.

> - get attributes for all bridge ports for bridge br-blah (not there)
> you could also use the ifindex of br-blah here instead

This would be usefull.


>
> Separate issue:
> To provide equivalence to brctl:
> - PF_BRIDGE should allow me to attach a bridge port to bridge of choice
> with SETLINK

You can already do this with:

	ip link set dev ethX master brX

I know, not very intuative, but it's there :(

-vlad



>
> cheers,
> jamal
>
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