Add the database used to register doorbelling entities, and APIs for adding and deleting entries, and logic for traversing the database and doorbelling once on behalf of all entities. Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com> Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com> Signed-off-by: Tomer Tayar <Tomer.Tayar@cavium.com> Signed-off-by: David S. Miller <davem@davemloft.net>