• Ben Hutchings's avatar
    sfc: Work around XMAC bug causing packet loss with some peers · cc11763b
    Ben Hutchings authored
    
    
    Received frames must be re-clocked by the local XGXS to the 156.25 MHz
    (DDR) clock of the XGMII.  If the remote clock is slightly faster this
    can reduce a minimum IPG of 64 bit-times (1 cycle) to 32 bit-times
    (half a cycle).  If the XMAC detects that a frame has reached the
    maximum RX frame length in the same cycle that it receives one of
    these reduced IPGs, it may miss the IPG, causing two valid frames to
    be treated as a single invalid frame (over-length with bad CRC).
    
    We work around this by increasing the maximum RX frame length so that
    peers with matched MTU will not provoke this bug.
    Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    cc11763b