net: ena: use build_skb() in RX path
This patch converts the RX path to use build_skb() for packets larger than copybreak (set to 256 by default). This function makes the first descriptor's page to be the linear part of the sk_buff struct buffer. Also remove the SKB description from the README since most of it no longer relevant and the parts that are left don't add information. Signed-off-by: Shay Agroskin <shayagr@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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