netdev - Re: mac80211 truesize bugs

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Message-Id: <1209906032.4065.28.camel@johannes.berg>
Date:	Sun, 04 May 2008 15:00:32 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, mb@...sch.de,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs

On Sun, 2008-05-04 at 20:56 +0800, Herbert Xu wrote:

> Actually this is not as bad as it sounds.  Since you're constructing
> the hardware header anyway, it may turn out to be easier to tack on
> the Ethernet header while you're at it.

We actuall remove the ethernet header and rewrite it to a hardware
header as the 802.11 spec pretty much mandates.

> Please note that the hardware cache is not the same as the neighbour
> cache.  Just because you lose the hardware cache doesn't mean that
> you'd lose the neighbour (ARP) cache.

Ok.

> However, this would mean that you'd no longer have an Ethernet device
> which is both good and bad.

Yeah. I don't think that'll go down well with userspace.

johannes

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