Re: [PATCH net-next v4 4/4] net: dsa: microchip: ksz8: add MTU configuration support

[Florian Fainelli]

On 11/10/2022 4:22 AM, Oleksij Rempel wrote:
> Make MTU configurable on KSZ87xx and KSZ88xx series of switches.
>
> Before this patch, pre-configured behavior was different on different
> switch series, due to opposite meaning of the same bit:
> - KSZ87xx: Reg 4, Bit 1 - if 1, max frame size is 1532; if 0 - 1514
> - KSZ88xx: Reg 4, Bit 1 - if 1, max frame size is 1514; if 0 - 1532
>
> Since the code was telling "... SW_LEGAL_PACKET_DISABLE, true)", I
> assume, the idea was to set max frame size to 1532.
>
> With this patch, by setting MTU size 1500, both switch series will be
> configured to the 1532 frame limit.
>
> This patch was tested on KSZ8873.
>
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> Acked-by: Arun Ramadoss <arun.ramadoss@xxxxxxxxxxxxx>

Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
--
Florian