• Roopa Prabhu's avatar
    net: lwtunnel: Handle fragmentation · 14972cbd
    Roopa Prabhu authored
    Today mpls iptunnel lwtunnel_output redirect expects the tunnel
    output function to handle fragmentation. This is ok but can be
    avoided if we did not do the mpls output redirect too early.
    ie we could wait until ip fragmentation is done and then call
    mpls output for each ip fragment.
    
    To make this work we will need,
    1) the lwtunnel state to carry encap headroom
    2) and do the redirect to the encap output handler on the ip fragment
    (essentially do the output redirect after fragmentation)
    
    This patch adds tunnel headroom in lwtstate to make sure we
    account for tunnel data in mtu calculations during fragmentation
    and adds new xmit redirect handler to redirect to lwtunnel xmit func
    after ip fragmentation.
    
    This includes IPV6 and some mtu fixes and testing from David Ahern.
    Signed-off-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
    Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    14972cbd
mpls_iptunnel.c 5.58 KB