• Nikolay Aleksandrov's avatar
    net: bridge: vlan: add per-vlan state · a580c76d
    Nikolay Aleksandrov authored
    The first per-vlan option added is state, it is needed for EVPN and for
    per-vlan STP. The state allows to control the forwarding on per-vlan
    basis. The vlan state is considered only if the port state is forwarding
    in order to avoid conflicts and be consistent. br_allowed_egress is
    called only when the state is forwarding, but the ingress case is a bit
    more complicated due to the fact that we may have the transition between
    port:BR_STATE_FORWARDING -> vlan:BR_STATE_LEARNING which should still
    allow the bridge to learn from the packet after vlan filtering and it will
    be dropped after that. Also to optimize the pvid state check we keep a
    copy in the vlan group to avoid one lookup. The state members are
    modified with *_ONCE() to annotate the lockless access.
    Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a580c76d
br_vlan_options.c 3.68 KB