netdev - Re: Fw: [Bug 201423] New: eth0: hw csum failure

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Message-ID: <869fbb53-a0a5-95f9-2c77-c3ae3f6d181f@tomt.net>
Date:   Tue, 30 Oct 2018 11:58:38 +0100
From:   Andre Tomt <andre@...t.net>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev <netdev@...r.kernel.org>, rossi.f@...ind.it,
        Dimitris Michailidis <dmichail@...gle.com>
Subject: Re: Fw: [Bug 201423] New: eth0: hw csum failure

On 27.10.2018 23:41, Andre Tomt wrote:
> On 26.10.2018 13:45, Andre Tomt wrote:
>> On 25.10.2018 19:38, Eric Dumazet wrote:
>>>
>>>
>>> On 10/24/2018 12:41 PM, Andre Tomt wrote:
>>>>
>>>> It eventually showed up again with mlx4, on 4.18.16 + fix and also 
>>>> on 4.19. I still do not have a useful packet capture.
>>>>
>>>> It is running a torrent client serving up various linux distributions.
>>>>
>>>
>>> Have you also applied this fix ?
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=db4f1be3ca9b0ef7330763d07bf4ace83ad6f913 
>>>
>>>
>>
>> No. I've applied it now to 4.19 and will report back if anything shows 
>> up.
> 
> Just hit it on the simpler server; no VRF, no tunnels, no nat/conntrack. 
> Only a basic stateless nftables ruleset and a vlan netdev (unlikely to 
> be the one triggering this I guess; it has only v4 traffic).

I'm currently testing 4.19 with the recomended commit added, plus these 
to sort out some GRO issues (on a hunch, unsure if related):
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=a8305bff685252e80b7c60f4f5e7dd2e63e38218
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=992cba7e276d438ac8b0a8c17b147b37c8c286f7
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=ece23711dd956cd5053c9cb03e9fe0668f9c8894

and I *think* it is behaving better now? it's not conclusive as it could 
take a while to trip in this environment but some of the test servers 
have not shown anything bad in almost 24h.