• Lennert Buytenhek's avatar
    dsa: add support for original DSA tagging format · cf85d08f
    Lennert Buytenhek authored
    Most of the DSA switches currently in the field do not support the
    Ethertype DSA tagging format that one of the previous patches added
    support for, but only the original DSA tagging format.
    The original DSA tagging format carries the same information as the
    Ethertype DSA tagging format, but with the difference that it does not
    have an ethertype field.  In other words, when receiving a packet that
    is tagged with an original DSA tag, there is no way of telling in
    eth_type_trans() that this packet is in fact a DSA-tagged packet.
    This patch adds a hook into eth_type_trans() which is only compiled in
    if support for a switch chip that doesn't support Ethertype DSA is
    selected, and which checks whether there is a DSA switch driver
    instance attached to this network device which uses the old tag format.
    If so, it sets the protocol field to ETH_P_DSA without looking at the
    packet, so that the packet ends up in the right place.
    Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
    Tested-by: default avatarNicolas Pitre <nico@marvell.com>
    Tested-by: default avatarPeter van Valderen <linux@ddcrew.com>
    Tested-by: default avatarDirk Teurlings <dirk@upexia.nl>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
dsa.h 917 Bytes