netdev - Re: thunderx sgmii interface hang

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Date:   Tue, 19 Dec 2017 15:17:13 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Tim Harvey <tharvey@...eworks.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Sunil Goutham <sgoutham@...ium.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: thunderx sgmii interface hang

On Tue, Dec 19, 2017 at 3:23 AM, Tim Harvey <tharvey@...eworks.com> wrote:
> On Wed, Dec 13, 2017 at 11:43 AM, Andrew Lunn <andrew@...n.ch> wrote:
>>> The nic appears to work fine (pings, TCP etc) up until a performance
>>> test is attempted.
>>> When an iperf bandwidth test is attempted the nic ends up in a state
>>> where truncated-ip packets are being sent out (per a tcpdump from
>>> another board):
>>
>> Hi Tim
>>
>> Are pause frames supported? Have you tried turning them off?
>>
>> Can you reproduce the issue with UDP? Or is it TCP only?
>>
>
> Andrew,
>
> Pause frames don't appear to be supported yet and the issue occurs
> when using UDP as well as TCP. I'm not clear what the best way to
> troubleshoot this is.
>
> Sunil, have any others reported this issue? I do not have a Cavium
> CN80xx/CN81xx reference board that has SGMII.

Cavium's CN80xx/CN81xx reference board has marvell,88e1240 phy
and i have never faced personally nor i heard from anyone having
such issues.

Thanks,
Sunil.

>
> Regards,
>
> Tim