netdev - Re: BUG:af_packet fails to TX TSO frames

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Message-ID: <bd4f863d-e39a-c31f-712f-1720af8e0024@cambridgegreys.com>
Date:   Wed, 11 Oct 2017 17:32:21 +0100
From:   Anton Ivanov <anton.ivanov@...bridgegreys.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: BUG:af_packet fails to TX TSO frames

Working through it at the moment.

The validation logic is prohibiting what the hardware considers to be a 
perfectly legit skb.

Once I narrow down the culprit I will come back with my findings.

Thanks for pointing me where to look by the way.

A.

On 10/11/17 17:26, Willem de Bruijn wrote:
> On Wed, Oct 11, 2017 at 11:54 AM, Anton Ivanov
> <anton.ivanov@...bridgegreys.com> wrote:
>> It is that patch.
>>
>> I rolled it back and immediately got it to work correctly on a Broadcom
>> Tigon. I can test on all other scenarios, I have tried, I suspect it will
>> come back alive on all of them.
>>
>> I am going to try to trace it through and see exactly where it drops a skb
>> which the card has no issues in accepting.
> It might be in the initialization of gso_type and csum. The virtio_net_hdr
> can encode various combinations of flags that are not allowed by the
> validation logic.
>

-- 
Anton R. Ivanov

Cambridge Greys Limited, England and Wales company No 10273661
http://www.cambridgegreys.com/