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[RFC] zero-copy AMSDU processing

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I am looking for ideas how can one process AMSDU in the software, without copying data.
Current implementation like ieee80211_amsdu_to_8023s() do copy packet data.

Assume I got in the driver, MPDU that is AMSDU containing several MSDU's.
It is in the single memory buffer that was allocated for DMA.
Can I construct skb's per MSDU with minimal data copy, having most of the
original data in place? Any ideas for this?

Thanks, Vladimir.
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