netdev - Re: [PATCH net-next v5 5/5] net: dsa: microchip: enable MTU normalization for KSZ8795 and KSZ9477 compatible switches

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Date:   Wed, 23 Nov 2022 13:41:45 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <UNGLinuxDriver@...rochip.com>,
        <vivien.didelot@...il.com>, <andrew@...n.ch>,
        <f.fainelli@...il.com>, <kuba@...nel.org>, <edumazet@...gle.com>,
        <pabeni@...hat.com>, <o.rempel@...gutronix.de>,
        <Woojung.Huh@...rochip.com>, <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <kernel@...gutronix.de>
Subject: Re: [PATCH net-next v5 5/5] net: dsa: microchip: enable MTU
 normalization for KSZ8795 and KSZ9477 compatible switches

Hi Oleksij,

On Wed, 2022-11-23 at 12:26 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> KSZ8795 and KSZ9477 compatible series of switches use global max
> frame
> size configuration register. So, enable MTU normalization for this
> reason.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz8795.c | 2 ++
>  drivers/net/dsa/microchip/ksz9477.c | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c
> b/drivers/net/dsa/microchip/ksz8795.c
> index d01bfd609130..d88d0b989e1a 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -1426,6 +1426,8 @@ int ksz8_switch_init(struct ksz_device *dev)
>          */
>         dev->ds->vlan_filtering_is_global = true;
> 
> +       dev->ds->mtu_enforcement_ingress = true;
> +
>         return 0;
>  }
> 
> diff --git a/drivers/net/dsa/microchip/ksz9477.c
> b/drivers/net/dsa/microchip/ksz9477.c
> index f6e7968ab105..4fb07fbdf565 100644
> --- a/drivers/net/dsa/microchip/ksz9477.c
> +++ b/drivers/net/dsa/microchip/ksz9477.c
> @@ -1134,6 +1134,8 @@ int ksz9477_setup(struct dsa_switch *ds)
>         struct ksz_device *dev = ds->priv;
>         int ret = 0;
> 
> +       dev->ds->mtu_enforcement_ingress = true;
> +

For the ksz8, you have added enforcement_ingress in ksz8_switch_init
but for ksz9477, you added in ksz9477_setup. Can you move
initialization from ksz8_switch_init to ksz8_setup to make similar
implementation for both the switches.

>         /* Required for port partitioning. */
>         ksz9477_cfg32(dev, REG_SW_QM_CTRL__4, UNICAST_VLAN_BOUNDARY,
>                       true);
> --
> 2.30.2
>