• Andrew Lunn's avatar
    net: fec: Allow reception of frames bigger than 1522 bytes · fbbeefdd
    Andrew Lunn authored
    The FEC Receive Control Register has a 14 bit field indicating the
    longest frame that may be received. It is being set to 1522. Frames
    longer than this are discarded, but counted as being in error.
    
    When using DSA, frames from the switch has an additional header,
    either 4 or 8 bytes if a Marvell switch is used. Thus a full MTU frame
    of 1522 bytes received by the switch on a port becomes 1530 bytes when
    passed to the host via the FEC interface.
    
    Change the maximum receive size to 2048 - 64, where 64 is the maximum
    rx_alignment applied on the receive buffer for AVB capable FEC
    cores. Use this value also for the maximum receive buffer size. The
    driver is already allocating a receive SKB of 2048 bytes, so this
    change should not have any significant effects.
    
    Tested on imx51, imx6, vf610.
    Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    fbbeefdd
fec_main.c 94.6 KB