netdev - Re: [PATCH 4/8] net/mlx4_en: Set max rate-limit for a TC

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Message-ID: <4F5F915E.4020505@intel.com>
Date:	Tue, 13 Mar 2012 11:26:38 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Roland Dreier <roland@...estorage.com>,
	Oren Duer <oren@...lanox.com>,
	Amir Vadai <amirv@...lanox.co.il>
Subject: Re: [PATCH 4/8] net/mlx4_en: Set max rate-limit for a TC

On 3/13/2012 10:21 AM, Amir Vadai wrote:
> From: Amir Vadai <amirv@...lanox.co.il>
> 
> Set max rate-limit using sysfs file /sys/class/net/<interface>/qos/ratelimit
> 
> To set, enter a space separated list of values in units of 100Mbps.  For
> example to set ratelimit of 5G to TC0 and 10G for the reset on eth2 issue:
> echo 50 100 100 100 100 100 100 100 100 > /sys/class/net/eth2/qos/ratelimit
> 
> Signed-off-by: Amir Vadai <amirv@...lanox.co.il>
> ---
> 
> We used sysfs since max bw isn't part of the ETS / DCBX NL support, and we're
> open to other suggestions to add generic support for max bw, e.g add call to
> the DCBX NL API.
> 

Its not really part of DCB so adding it to DCBnl seems a bit forced. But how
about adding it as an attribute of the mqprio which "knows" about the queue
groupings?

Does the rate limiter take into account the user priority to tc mapping or
is it really just a group of queues with a rate limit? The code makes it
look like it really is per 802.1Q traffic class.

.John
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