netdev - Re: zd1211 ported to Devicescape stack

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Date:	Sat, 2 Dec 2006 14:25:39 +0100
From:	Ulrich Kunitz <kune@...ne-taler.de>
To:	Michael Wu <flamingice@...rmilk.net>
Cc:	Daniel Drake <dsd@...too.org>, netdev@...r.kernel.org,
	John Linville <linville@...driver.com>,
	Luis Rodriguez <mcgrof@...il.com>
Subject: Re: zd1211 ported to Devicescape stack

Hi Michael,

> 	I have finished a port of the zd1211 driver to the Devicescape 802.11 stack. 

This is absolutely great news. I will look into it and check it
today.

> 	- The original driver does not seem to check if a frame has been successfully 
> TXed (as in RXed an ACK), so the port does not properly report to the stack 
> whether or not a TX succeeded.

TX is atomic. Do you really want to spin for the received ACK? Layer 2 doesn't
need to make any guarantees for packet transmission, so I have
trouble to see the point here. The Linux Device Driver book says
explicitly that packet transmission must not have been completed
at the point in time the function returns.

> 	-Because d80211 does not have complete regulatory domains support yet, the 
> associated code was trimmed to the bare minimum of reading the region code. 

I have to look into it, but the code we had, didn't rely on upper
layer support. I would suggest to maintain it until d80211 has
complete regulatory domains support.

> 	- The LED link status isn't too reliable - I haven't found a way to reliably 
> tell if the upper layer thinks it is associated, and I don't know how to use 
> the LED api. Not too worried about this issue though.

It took us also some time to do it for softmac. But it appears
that the d80211 stack needs still a fair amount of work.

-- 
Uli Kunitz
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