linux-kernel - Re: [PATCH 3/4] net: dsa: mv88e6xxx: Implement .port_change_mtu/.port_max

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Date:   Thu, 23 Jul 2020 20:50:27 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] net: dsa: mv88e6xxx: Implement
 .port_change_mtu/.port_max_mtu


On 24/07/20 1:31 am, Andrew Lunn wrote:
> On Thu, Jul 23, 2020 at 03:59:41PM +1200, Chris Packham wrote:
>> Add implementations for the mv88e6xxx switches to connect with the
>> generic dsa operations for configuring the port MTU.
> Hi Chris
>
> What tree is this against?
$ git config remote.origin.url
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ git describe `git merge-base HEAD origin/master`
v5.8-rc6-3-g4fa640dc5230

> commit 2a550aec36543b20f087e4b3063882e9465f7175
> Author: Andrew Lunn <andrew@...n.ch>
> Date:   Sat Jul 11 22:32:05 2020 +0200
>
>      net: dsa: mv88e6xxx: Implement MTU change
>      
>      The Marvell Switches support jumbo packages. So implement the
>      callbacks needed for changing the MTU.
>      
>      Signed-off-by: Andrew Lunn <andrew@...n.ch>
>      Signed-off-by: David S. Miller <davem@...emloft.net>
>
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index d995f5bf0d40..6f019955ae42 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -2693,6 +2693,31 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
>          return mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_DEFAULT_VLAN, 0);
>   }
>   
> +static int mv88e6xxx_get_max_mtu(struct dsa_switch *ds, int port)
> +{
> +       struct mv88e6xxx_chip *chip = ds->priv;
> +
> +       if (chip->info->ops->port_set_jumbo_size)
> +               return 10240;
> +       return 1522;
> +}
> +
> +static int mv88e6xxx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
> +{
> ...
Snap. I created my series because I need it on an internal 5.7 based 
kernel. So I'm happy to drop mine and back-port your implementation.