netdev - d80211: The struct ieee80211_hw

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Message-Id: <200612131142.20556.mb@bu3sch.de>
Date:	Wed, 13 Dec 2006 11:42:20 +0100
From:	Michael Buesch <mb@...sch.de>
To:	Jiri Benc <jbenc@...e.cz>
Cc:	netdev@...r.kernel.org
Subject: d80211: The struct ieee80211_hw_modes array is a pain

I am currently porting the bcm43xx driver to my new Sonics
Silicon Backplane busdriver.
I am having a major pain implementing the hw->modes field
for this. In particular, the problem is allocation.
I always felt sick about hw->modes, but with my new code it's
damn complicated to get allocation of the stuff right.
The problem is, that I do not know in advance which PHYMODEs
my device supports (in fact, we never knew that, but we worked
around it (in a broken way)).
We have the following scenario: The PHYs are probed one after
each other. We have one data structure per PHY. This bites
the static hw->modes array in its ass. I would either have to
allocate it "big enough" at the first time (wasting lots of memory)
or I'd have to re-allocate it every time a new PHY is probed.
Another (much harder to fix) problem is the opposite of the probing:
Removing the PHYs.

So, what I'd like to have is:

One struct ieee802111_hw_mode which I can embed into the PHY
data structure. This struct is now dynamically registered to the
ieee80211 subsystem (instead of doing a static array pain).

Registering and unregistering would be done with simple linked lists,
perhaps, in d80211.

If nobody has any objections against this approach, I will do a
patch soon.

-- 
Greetings Michael.
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