• Alexander Duyck's avatar
    GRO: Add support for TCP with fixed IPv4 ID field, limit tunnel IP ID values · 1530545e
    Alexander Duyck authored
    This patch does two things.
    
    First it allows TCP to aggregate TCP frames with a fixed IPv4 ID field.  As
    a result we should now be able to aggregate flows that were converted from
    IPv6 to IPv4.  In addition this allows us more flexibility for future
    implementations of segmentation as we may be able to use a fixed IP ID when
    segmenting the flow.
    
    The second thing this does is that it places limitations on the outer IPv4
    ID header in the case of tunneled frames.  Specifically it forces the IP ID
    to be incrementing by 1 unless the DF bit is set in the outer IPv4 header.
    This way we can avoid creating overlapping series of IP IDs that could
    possibly be fragmented if the frame goes through GRO and is then
    resegmented via GSO.
    Signed-off-by: default avatarAlexander Duyck <aduyck@mirantis.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    1530545e
dev.c 203 KB