netdev - Re: [PATCH] mac80211: rewrite fragmentation code

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Message-Id: <200805191308.14548.rusty@rustcorp.com.au>
Date:	Mon, 19 May 2008 13:08:13 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, mb@...sch.de,
	johannes@...solutions.net, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, ron.rindjunsky@...el.com, tomasw@...il.com,
	ivdoorn@...il.com, peter.p.waskiewicz.jr@...el.com
Subject: Re: [PATCH] mac80211: rewrite fragmentation code

On Saturday 17 May 2008 05:40:39 David Miller wrote:
> My description describes how I want the mid-layer queue to disappear
> entirely.  Queueing would be done by the driver only.

Ok, the more I ponder this, the more I like it.  It has a very nice side 
benefit for virtio_net: we can xmit a whole bunch of packets before notifying 
the host.  Real NICs might gain similarly.

The bit I can't see is what to do about qdisc if the driver manages its own 
queue(s).  Leave the qdisc as currently in place and have the driver call 
dev_dequeue_skb() (or some wrapper) directly?  Modulo locking issues, that 
should be a fairly simple change.

Thanks,
Rusty.
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