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Re: [PATCHv2 00/21] cw1200: ST-Ericsson cw1200 wlan device driver

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On Wednesday, December 12, 2012 12:23:11 AM Solomon Peachy wrote:
> On Fri, Jul 06, 2012 at 04:18:40PM -0400, John W. Linville wrote:
>
> IIRC it's because mac80211 doesn't provide a way of pre-allocating MIC 
> space at the tail end of the frame -- the hardware performs the work but 
> still needs the space in the payload.  The code I'm maintaining has 
> workarounds for this; not the most efficient solution but I'd rather see 
> the code merged as-is, and then we can incrementally improve things 
> (perhaps by enhancing mac80211 as needed)

Mac80211 already reserves at least 18 bytes tailroom [which can be
allocated by a simple skb_put]. In fact p54 uses this tailroom to
pass the MIC (8 bytes) + ICV (4 bytes) to the firmware. Do you need
more than 18 bytes?

Regards,
	Chr
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