linux-kernel - Re: [PATCH] ethtool: Report speed and duplex as unknown when device is runtime suspended

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: <d6c5a1c4-e41f-d239-e0b0-15eba3e78274@gmail.com>
Date:   Thu, 26 Mar 2020 19:56:29 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     alexander.duyck@...il.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Aaron Brown <aaron.f.brown@...el.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Andrew Lunn <andrew@...n.ch>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ethtool: Report speed and duplex as unknown when device
 is runtime suspended



On 3/26/2020 7:45 PM, Kai-Heng Feng wrote:
> Device like igb gets runtime suspended when there's no link partner. We
> can't get correct speed under that state:
> $ cat /sys/class/net/enp3s0/speed
> 1000
> 
> In addition to that, an error can also be spotted in dmesg:
> [  385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost
> 
> Since device can only be runtime suspended when there's no link partner,
> we can directly report the speed and duplex as unknown.
> 
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Cc: Aaron Brown <aaron.f.brown@...el.com>
> Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

I would push this to the responsibility of the various drivers instead
of making this part of the standard ethtool implementation.
-- 
Florian