linux-kernel - Re: [Intel-wired-lan] [PATCH v2] e1000e: Make speed detection on hotplugging cable more reliable

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Date:   Wed, 24 Jul 2019 22:52:38 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH v2] e1000e: Make speed detection on
 hotplugging cable more reliable

On Mon, 2019-07-15 at 20:25 +0800, Kai-Heng Feng wrote:
> After hotplugging an 1Gbps ethernet cable with 1Gbps link partner, the
> MII_BMSR may report 10Mbps, renders the network rather slow.
> 
> The issue has much lower fail rate after commit 59653e6497d1 ("e1000e:
> Make watchdog use delayed work"), which essentially introduces some
> delay before running the watchdog task.
> 
> But there's still a chance that the hotplugging event and the queued
> watchdog task gets run at the same time, then the original issue can be
> observed once again.
> 
> So let's use mod_delayed_work() to add a deterministic 1 second delay
> before running watchdog task, after an interrupt.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)

Tested-by: Aaron Brown <aaron.f.brown@...el.com>