netdev - Re: TKIP encryption should allocate enough tailroom

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Date:	Thu, 18 Jan 2007 08:55:37 -0500
From:	Brandon Craig Rhodes <brandon@...desmill.org>
To:	Pekka Pietikainen <pp@...oulu.fi>
Cc:	netdev@...r.kernel.org
Subject: Re: TKIP encryption should allocate enough tailroom

Pekka Pietikainen <pp@...oulu.fi> writes:

> On Wed, Jan 17, 2007 at 11:46:35AM -0500, Brandon Craig Rhodes wrote:
>> Having further reviewed my code, I have changed my mind; the
>> ieee80211_crypt_tkip routines are not designed to be responsible for
>> creating enough headroom and tailroom.
>
> Even then, if ieee80211_tkip_encrypt() didn't produce debug output
> for the not enough space-case, should that be added to catch other
> potentially broken drivers?

I think your idea is an excellent one, and would have prevented my
having to add a half-dozen printk()'s to the code myself to discover
what was going on!

I would be happy to submit such a patch myself, but am not sure what
the local kernel conventions are regarding error messages - and the
ieee80211_crypt_tkip.c functions seem wildly inconsistent with regard
to debugging messages!  In some circumstances, debug messages are
always produced; in several others, net_ratelimit() is called to
decided whether to print an error (but why in these cases and not
others?); and in many cases, nothing is printed at all (is this
because convention would dictate that the caller discover the error
and print something out?).

If I want to generate a patch that festoons the ieee80211 functions
with informative error messages, what are the guidelines?

-- 
Brandon Craig Rhodes   brandon@...desmill.org   http://rhodesmill.org/brandon
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