linux-kernel - Re: [PATCH] net: fec: don't reset irq coalesce settings to defaults on "ip link up"

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Message-ID: <Y35hS5mbstSZeF/Z@lunn.ch>
Date:   Wed, 23 Nov 2022 19:07:07 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Joakim Zhang <qiangqing.zhang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fec: don't reset irq coalesce settings to defaults
 on "ip link up"

On Wed, Nov 23, 2022 at 02:38:52PM +0100, Rasmus Villemoes wrote:
> Currently, when a FEC device is brought up, the irq coalesce settings
> are reset to their default values (1000us, 200 frames). That's
> unexpected, and breaks for example use of an appropriate .link file to
> make systemd-udev apply the desired
> settings (https://www.freedesktop.org/software/systemd/man/systemd.link.html),
> or any other method that would do a one-time setup during early boot.
> 
> Refactor the code so that fec_restart() instead uses
> fec_enet_itr_coal_set(), which simply applies the settings that are
> stored in the private data, and initialize that private data with the
> default values.
> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew