netdev - Re: [net-next-2.6 PATCH v2 1/3] net: implement mechanism for HW based QOS

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Message-ID: <20101226154709.5b24f976@nehalam>
Date:	Sun, 26 Dec 2010 15:47:09 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"hadi@...erus.ca" <hadi@...erus.ca>,
	"tgraf@...radead.org" <tgraf@...radead.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>
Subject: Re: [net-next-2.6 PATCH v2 1/3] net: implement mechanism for HW
 based QOS

On Wed, 22 Dec 2010 21:29:43 -0800
John Fastabend <john.r.fastabend@...el.com> wrote:

> On 12/22/2010 1:12 AM, Johannes Berg wrote:
> > On Tue, 2010-12-21 at 11:28 -0800, John Fastabend wrote:
> >> This patch provides a mechanism for lower layer devices to
> >> steer traffic using skb->priority to tx queues. This allows
> >> for hardware based QOS schemes to use the default qdisc without
> >> incurring the penalties related to global state and the qdisc
> >> lock. While reliably receiving skbs on the correct tx ring
> >> to avoid head of line blocking resulting from shuffling in
> >> the LLD. Finally, all the goodness from txq caching and xps/rps
> >> can still be leveraged.
> > 
> > Is there any chance this might be applicable to the 802.11 layer as
> > well? We will definitely still need an ndo_select_queue handler to reset
> > in the case where the peer doesn't support QoS, but it seems the part
> > that depends on the frame itself could be pushed out to the generic
> > framework instead of having net/wireless/util.c:cfg80211_classify8021d?
> > 
> > johannes
> > 
> 
> Johannes,
> 
> I took a quick look at this and I believe it should be doable. It would be nice to completely remove the ndo_select_queue if possible though.
> 
> I probably won't have a chance to look any further into this for at least a week maybe two. So I'll think about it a bit more later unless someone else gets there first.
> 
> Thanks,
> John.

The Beceem Wimax driver has same kind of select queue.

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