From: Eric Dumazet <edumazet@google.com>
To: David Laight <David.Laight@aculab.com>,
David Lebrun <dlebrun@google.com>
Cc: Vladimir Oltean <olteanv@gmail.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next 2/2] net: optimize skb_postpull_rcsum()
Date: Fri, 3 Dec 2021 08:58:49 -0800 [thread overview]
Message-ID: <CANn89i+sANhK4m_JptWgnjXf5VRuSYw6MkLKfS3ut5SbUbrmoQ@mail.gmail.com> (raw)
In-Reply-To: <43cc0ca9a0e14fc995c0c28d31440c15@AcuMS.aculab.com>
On Fri, Dec 3, 2021 at 8:47 AM David Laight <David.Laight@aculab.com> wrote:
>
> > > 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.
This is what I already mentioned in this email thread, and the reason
I have CCed David Lebrun.
https://marc.info/?l=linux-netdev&m=163845851801840&w=2
David, can you comment on this ?
> 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).
>
Please point where all zero buffers can be valid in the first place.
next prev parent reply other threads:[~2021-12-03 17:00 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-24 20:24 [PATCH net-next 0/2] net: small csum optimizations Eric Dumazet
2021-11-24 20:24 ` [PATCH net-next 1/2] gro: optimize skb_gro_postpull_rcsum() Eric Dumazet
2021-11-24 20:24 ` [PATCH net-next 2/2] net: optimize skb_postpull_rcsum() Eric Dumazet
2021-11-25 9:41 ` David Laight
2021-11-25 13:32 ` Eric Dumazet
2021-11-25 14:29 ` David Laight
2021-12-02 13:10 ` Vladimir Oltean
2021-12-02 14:51 ` Eric Dumazet
2021-12-02 16:29 ` Vladimir Oltean
2021-12-02 19:32 ` Eric Dumazet
2021-12-02 20:37 ` Eric Dumazet
2021-12-02 21:07 ` Vladimir Oltean
2021-12-02 20:40 ` Vladimir Oltean
2021-12-02 20:58 ` Vladimir Oltean
2021-12-02 20:58 ` David Laight
2021-12-02 21:40 ` Vladimir Oltean
2021-12-03 14:51 ` David Laight
2021-12-03 14:57 ` David Laight
2021-12-03 16:14 ` Vladimir Oltean
2021-12-03 16:30 ` Eric Dumazet
2021-12-03 16:47 ` David Laight
2021-12-03 16:58 ` Eric Dumazet [this message]
2021-12-03 17:41 ` David Laight
2021-12-02 15:06 ` David Laight
2021-12-02 15:22 ` Eric Dumazet
2021-11-26 5:20 ` [PATCH net-next 0/2] net: small csum optimizations patchwork-bot+netdevbpf
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