• Ido Schimmel's avatar
    spectrum: Reference count VLAN entries · b3529af6
    Ido Schimmel authored
    One of the basic construct in the device is a port-VLAN pair, which can
    be bound to a FID or a RIF in order to direct packets to the bridge or
    the router, respectively.
    
    Since not all the netdevs are configured with a VLAN (e.g., sw1p1 vs.
    sw1p1.10), VID 1 is used to represent these and thus this VID can be
    used by both upper devices of mlxsw ports and by the driver itself.
    
    However, this VID is not reference counted and therefore might be freed
    prematurely, which can result in various WARNINGs. For example:
    
    $ ip link add name br0 type bridge vlan_filtering 1
    $ teamd -t team0 -d -c '{"runner": {"name": "lacp"}}'
    $ ip link set dev team0 master br0
    $ ip link set dev enp1s0np1 master team0
    $ ip address add 192.0.2.1/24 dev enp1s0np1
    
    The enslavement to team0 will fail because team0 already has an upper
    and thus vlan_vids_del_by_dev() will be executed as part of team's error
    path which will delete VID 1 from enp1s0np1 (added by br0 as PVID). The
    WARNING will be generated when the driver will realize it can't find VID
    1 on the port and bind it to a RIF.
    
    Fix this by adding a reference count to the VLAN entries on the port, in
    a similar fashion to the reference counting used by the corresponding
    'vlan_vid_info' structure in the 8021q driver.
    
    Fixes: c57529e1 ("mlxsw: spectrum: Replace vPorts with Port-VLAN")
    Reported-by: default avatarTal Bar <talb@mellanox.com>
    Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
    Tested-by: default avatarTal Bar <talb@mellanox.com>
    Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    b3529af6
spectrum.h 22.8 KB