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Message-ID: <20211103140722.75a729e1@fixe.home>
Date: Wed, 3 Nov 2021 14:07:22 +0100
From: Clément Léger <clement.leger@...tlin.com>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
"UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
Andrew Lunn <andrew@...n.ch>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 4/6] net: ocelot: add support for ndo_change_mtu
Le Wed, 3 Nov 2021 12:40:55 +0000,
Vladimir Oltean <vladimir.oltean@....com> a écrit :
> > +static int ocelot_change_mtu(struct net_device *dev, int new_mtu)
> > +{
> > + struct ocelot_port_private *priv = netdev_priv(dev);
> > + struct ocelot_port *ocelot_port = &priv->port;
> > + struct ocelot *ocelot = ocelot_port->ocelot;
> > +
> > + ocelot_port_set_maxlen(ocelot, priv->chip_port, new_mtu);
> > + WRITE_ONCE(dev->mtu, new_mtu);
>
> The WRITE_ONCE seems absolutely gratuitous to me.
I applied what is recommended in netdevice.h for the mtu field of the
netdev.
(https://elixir.bootlin.com/linux/v5.15/source/include/linux/netdevice.h#L1989)
And used in __dev_set_mtu
(https://elixir.bootlin.com/linux/v5.15/source/net/core/dev.c#L8849)
>
> > +
> > + return 0;
> > +}
> > +
> > enum ocelot_action_type {
> > OCELOT_MACT_LEARN,
> > OCELOT_MACT_FORGET,
--
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com
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