netdev - Re: [PATCH net 1/3] net: phy: realtek: add eee advertisement disable options

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <476b72f3-5efe-3551-6c24-0e378d655a0f@gmail.com>
Date:   Tue, 15 Nov 2016 09:03:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Jerome Brunet <jbrunet@...libre.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andre Roth <neolynx@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/3] net: phy: realtek: add eee advertisement disable
 options

On 11/15/2016 08:30 AM, Andrew Lunn wrote:
> On Tue, Nov 15, 2016 at 03:29:12PM +0100, Jerome Brunet wrote:
>> On some platforms, energy efficient ethernet with rtl8211 devices is
>> causing issue, like throughput drop or broken link.
>>
>> This was reported on the OdroidC2 (DWMAC + RTL8211F). While the issue root
>> cause is not fully understood yet, disabling EEE advertisement prevent auto
>> negotiation from enabling EEE.
>>
>> This patch provides options to disable 1000T and 100TX EEE advertisement
>> individually for the realtek phys supporting this feature.
> 
> Looking at the code, i don't see anything specific to RealTek
> here. This all seems generic. So should it be in phy.c and made a
> generic OF property which can be applied to any PHY which supports
> EEE.

Agreed. Just to be sure, Jerome, you did verify that with EEE no longer
advertised, ethtool --set-eee fails, right? The point is that you may be
able to disable EEE on boot, but if there is a way to re-enable it later
on, we would want to disable that too.
-- 
Florian