[NET]: Update comments for skb checksums
Rusty (whose comments we should all study and emulate :) pointed out that our comments for skb checksums are no longer up-to-date. So here is a patch to 1) add the case of partial checksums on input; 2) update partial checksum case to mention csum_start/csum_offset; 3) mention the new IPv6 feature bit. Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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