netdev - RE: [PATCH net-next] iwlwifi: dont pull too much payload in skb head

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Message-ID: <1DC40B07CD6EC041A66726C271A73AE61955F646@IRSMSX102.ger.corp.intel.com>
Date:	Tue, 29 May 2012 14:45:34 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"Guy, Wey-Yi W" <wey-yi.w.guy@...el.com>
Subject: RE: [PATCH net-next] iwlwifi: dont pull too much payload in skb head

> > We may want to move this code into mac80211 later though since it also
> > has an if (pull in everything, even reallocating if necessary, if it's
> > a management frame), but that can wait, I think we're the only driver
> > using paged RX.
> 
> This is OK, these frames wont be injected in linux IP/TCP stack.

Right.

> Or maybe you would like an optimized version of skb_header_pointer(),
> avoiding the copy if the whole blob can be part of _one_ fragment ?

Hmm. I guess that would work, but I'm not sure it's worth the effort since there typically aren't many management frames. We'd have to replace all skb->data, the entire mac80211 assumes that management frames are linear. 

johannes
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