Re: [PATCH net-next v2 4/7] net: bcmgenet: derive the receive buffer length from the MTU

[Florian Fainelli <florian.fainelli@broadcom.com>]

On 10/5/26 15:24, Nicolai Buchwitz wrote:
> The receive buffer length is a fixed 2048 bytes. The packet ready
> thresholds keep whatever value the reset left. Neither follows the MTU.
> 
> Compute the receive threshold from the MTU and program it into RBUF. The
> buffer length follows from it, with the status block on top. The MTU is
> still fixed at ETH_DATA_LEN, so the threshold comes out at the reset
> default and the buffer only grows by the status block the hardware already
> wrote.
> 
> Program the transmit threshold at its maximum as well. It sets how much of
> a frame the MAC holds before it starts sending, and holding less buys
> nothing. A later patch lowers it for the few MTUs that need the room.
> 
> Suggested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
> Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
-- 
Florian