netdev - Re: [Patch net] net: invert the check of detecting hardware RX checksum fault

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Date:   Fri, 16 Nov 2018 12:10:15 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Tom Herbert <tom@...bertland.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [Patch net] net: invert the check of detecting hardware RX
 checksum fault

On Thu, Nov 15, 2018 at 8:59 PM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Thu, Nov 15, 2018 at 08:52:23PM -0800, Eric Dumazet wrote:
> >
> > It is very possible NIC provides an incorrect CHECKSUM_COMPLETE, in the
> > case non zero trailer bytes were added by a buggy switch (or host)
>
> We should probably change netdev_rx_csum_fault to print out at
> least one complete packet plus the hardware-generated checksum.
>
> That would make debugging these rare hardware faults much easier.

I have a patch as a starter:
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=7fe50ac83f4319c18ed7c634d85cad16bd0bf509

Let me know if you want to add more information there.

Dumping the hex of an skb data?

Thanks.