netdev - Re: mac80211 truesize bugs

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Date:	Tue, 13 May 2008 23:37:23 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Tomas Winkler <tomasw@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	David Miller <davem@...emloft.net>,
	herbert@...dor.apana.org.au, mb@...sch.de, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs

> >  Most fullmac devices also need some space, whether they do things that
> >  way or not is a completely different thing, the ieee80211 stack for
> >  example copies every packet into a new skb anyway.
> 
> It's really depends on when is the 802.3 to 802.11 header translation
> made it doesn't matter whether it's fullmac or softmac. I would say
> that WLAN is OK.

True, some devices take 802.3 frames and do the translation and
everything themselves. I dunno. I guess it would make sense to make it
mac80211 anyway because ieee80211 doesn't care and the other drivers are
probably handling this in some other way anyway (if maybe even by using
different dma descriptors, or just not caring because transfer speeds
are low enough)

johannes

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