From: Zefir Kurtisi <zefir.kurt...@neratec.com> Date: Mon, 22 Aug 2016 15:56:38 +0200
> The eTSEC register MRBLR defines the maximum space in > the RX buffers and is set to 1536 by gianfar. This > reasonably covers the common use case where the MTU > is kept at default 1500. In that case, the largest > Ethernet frame size of 1518 plus an optional > GMAC_FCB_LEN of 8, and an additional padding of 8 > to handle FSL_GIANFAR_DEV_HAS_TIMER totals to 1534 > and nicely fit within the chosen MRBLR. > > Alas, if the eTSEC is attached to a DSA enabled switch, > the (E)DSA header extension (4 or 8 bytes) causes every > maximum sized frame to be fragmented by the hardware. > > This patch increases the maximum RX buffer size by 8 > and rounds up to the next multiple of 64, which the > hardware's defines as RX buffer granularity. > > Signed-off-by: Zefir Kurtisi <zefir.kurt...@neratec.com> Applied.
