netdev - Re: thunderx sgmii interface hang

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Message-ID: <CAJ+vNU1RL1KuP1=9F=zqF6q7wTDArB-wY9V9NLJ87zBNdmy9wA@mail.gmail.com>
Date:   Fri, 22 Dec 2017 16:22:43 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Sunil Goutham <sgoutham@...ium.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: thunderx sgmii interface hang

On Fri, Dec 22, 2017 at 2:45 PM, Andrew Lunn <andrew@...n.ch> wrote:
>> Currently I'm not using the DP83867_PHY driver (after verifying the
>> issue occurs with or without that driver).
>>
>> It does not occur if I limit UDP (ie 950mbps). I disabled all offloads
>> and the issue still occurs.
>
>> I'm told that the particular Cavium reference board with an SGMII phy
>> doesn't show this issue (I don't have that specific board to do my own
>> testing or comparisons against our board) so I'm inclined to think it
>> has something to do with an interaction with the DP83867 PHY. I would
>> like to start poking at PHY registers to see if I can find anything
>> unusual. The best way to do that from userspace is via
>> SIOCGMIIREG/SIOCSMIIREG right? The thunderx nic doesn't currently
>> support ioctl's so I guess I'll have to add that support unless
>> there's a way to get at phy registers from userspace through a phy
>> driver?
>
> phy_mii_ioctl() does what you need, and is simple to use.
>
> mii-tool will then give you access to the standard PHY registers.
>
>          Andre

I didn't think mii-tool or ethtool (its replacement right?) could
read/write specific phy registers via cmdline? I wrote my own tool
some time ago to do that [1].

Tim

[1] http://trac.gateworks.com/attachment/wiki/conformance_testing/mii-reg.c