netdev - Re: S/G operation, skb checksums, data copying

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Message-Id: <1209927483.3655.23.camel@johannes.berg>
Date:	Sun, 04 May 2008 20:58:03 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	netdev <netdev@...r.kernel.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: S/G operation, skb checksums, data copying


> However, mac80211 needs to change the skb header before the skb is
> handed to the hardware. Often enough, the skb it will get is cloned, so
> it has to copy the header. Hence, it would benefit from having the
> actual skb data not be in the header, but that is unavoidable currently
> since we have no checksum features.

I just realised that this wouldn't happen since the extra data is
actually in a struct page *, so never mind.

johannes

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