netdev - Re: igb bandwidth allocation configuration

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Message-ID: <20090911003838.GA19376@verge.net.au>
Date:	Fri, 11 Sep 2009 10:38:38 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: igb bandwidth allocation configuration

On Thu, Sep 10, 2009 at 01:55:37PM +0200, Patrick McHardy wrote:
> Patrick McHardy wrote:
> > Simon Horman wrote:
> >>
> >> I have been looking into adding support the 82586's per-PF/VF
> >> bandwidth allocation to the igb driver. It seems that the trickiest
> >> part is working out how to expose things to user-space.
> >>
> >> ...
> >> Internally it seems that actually the limits are applied to HW Tx queues
> >> rather than directly VMs. There are 16 such queues. Accordingly it might
> >> be useful to design an interface to set limits per-queue using ethtool.
> >> But this would seem to also require exposing which queues are associated
> >> with which PF/VF.
> > 
> > Just an idea since I don't know much about this stuff:
> > 
> > Since we now have the mq packet scheduler, which exposes the device
> > queues as qdisc classes, how about adding driver-specific configuration
> > attributes that are passed to the driver by the mq scheduler? This
> > would allow to configure per-queue bandwidth limits using regular TC
> > commands and also use those limits without VFs for any kind of traffic.
> > Drivers not supporting this would refuse unsupported options.
> 
> Attached patch demonstrates the idea. Compile-tested only.
> 

Thanks, that seems like a pretty good idea to me.
I'll see if I can make it work.

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