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

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Message-ID: <20181116045900.lqztm7r5gk246act@gondor.apana.org.au>
Date:   Fri, 16 Nov 2018 12:59:00 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Cong Wang <xiyou.wangcong@...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 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.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt