netdev - RE: [PATCH net-next 2/2] net: optimize skb_postpull

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Date:   Fri, 3 Dec 2021 16:47:32 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Eric Dumazet' <edumazet@...gle.com>,
        Vladimir Oltean <olteanv@...il.com>
CC:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 2/2] net: optimize skb_postpull_rcsum()

> > Eric, could you please send a patch with this change?
> 
> Sure, I will do this today, after more testing.

I've just done a quick grep and found two ~csum_partial() in
include/net/seg6.h.
Both are wrong (and completely horrid).

There are also 40 csum_partial(buf, len, 0).
If all the buffer is zero they'll return zero - invalid.
They ought to be changed to csum_partial(buf, len, 0xffff).

	David

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