Re: [PATCH net-next v4 5/8] net: bcmgenet: derive the receive buffer length from the MTU

On 10/12/26 02:00, 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. Derive UMAC_MAX_FRAME_LEN and the flow period from the MTU too, with
a floor at ETH_DATA_LEN so a lower MTU does not stop the MAC accepting a
standard frame.

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