netdev - Re: [Linux-zigbee-devel] [PATCH 1/6] mac802154: Immediately retry sending failed packets

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Date:	Tue, 02 Apr 2013 21:59:37 -0400
From:	Alan Ott <alan@...nal11.us>
To:	David Miller <davem@...emloft.net>
CC:	werner@...esberger.net, netdev@...r.kernel.org,
	linux-zigbee-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-zigbee-devel] [PATCH 1/6] mac802154: Immediately retry
 sending failed packets

On 04/02/2013 09:56 PM, David Miller wrote:
> From: Alan Ott <alan@...nal11.us>
> Date: Tue, 02 Apr 2013 21:24:59 -0400
>
>> I like it for a couple of reasons.
>> 1. Most supported devices have only single packet output buffer, so
>> blocking in the driver is the most straight-forward way to handle it.
>> The alternative is to make each driver have a workqueue for xmit() (to
>> lift the blocking out from atomic context). This makes each driver simpler.
>>
>> 2. All of the flow control can be handled one time in the mac802154 layer.
> We have a perfectly working flow control mechanism in the generic
> networking queuing layer.  Please use it instead of inventing things.

I'm pretty sure that's what I'm doing in [1]. When I say "flow control
can be handled," I mean managing calls to netif_stop_queue() and
netif_wake_queue(). Is there something else I should be doing instead?

> If it does not meet your needs, fix it, rather than go off and do
> your own thing.  That way everyone benfits, not just you.

Fully agreed.

Alan.

[1] http://www.spinics.net/lists/netdev/msg231483.html

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