• Paul Blakey's avatar
    net: openvswitch: Set OvS recirc_id from tc chain index · 95a7233c
    Paul Blakey authored
    Offloaded OvS datapath rules are translated one to one to tc rules,
    for example the following simplified OvS rule:
    
    recirc_id(0),in_port(dev1),eth_type(0x0800),ct_state(-trk) actions:ct(),recirc(2)
    
    Will be translated to the following tc rule:
    
    $ tc filter add dev dev1 ingress \
    	    prio 1 chain 0 proto ip \
    		flower tcp ct_state -trk \
    		action ct pipe \
    		action goto chain 2
    
    Received packets will first travel though tc, and if they aren't stolen
    by it, like in the above rule, they will continue to OvS datapath.
    Since we already did some actions (action ct in this case) which might
    modify the packets, and updated action stats, we would like to continue
    the proccessing with the correct recirc_id in OvS (here recirc_id(2))
    where we left off.
    
    To support this, introduce a new skb extension for tc, which
    will be used for translating tc chain to ovs recirc_id to
    handle these miss cases. Last tc chain index will be set
    by tc goto chain action and read by OvS datapath.
    Signed-off-by: default avatarPaul Blakey <paulb@mellanox.com>
    Signed-off-by: default avatarVlad Buslov <vladbu@mellanox.com>
    Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
    Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    95a7233c