RFC introduce bpf fdb lookup helper for xdp

Similar to bpf_xdp_ct_lookup routine, introduce br_fdb_find_port_from_ifindex unstable helper in order to accelerate linux bridge with XDP. br_fdb_find_port_from_ifindex will perform a lookup in the associated bridge fdb table and it will return the output ifindex if the destination address is associated to a bridge port or -ENODEV for BOM traffic or if lookup fails.

Lorenzo Bianconi (2):
net: bridge: add unstable br_fdb_find_port_from_ifindex helper
samples: bpf: add xdp fdb lookup program

 net/bridge/br.c            |  21 +++++
 net/bridge/br_fdb.c        |  67 +++++++++++++---
 net/bridge/br_private.h    |  12 +++
 samples/bpf/Makefile       |   9 ++-
 samples/bpf/xdp_fdb.bpf.c  |  68 +++++++++++++++++
 samples/bpf/xdp_fdb_user.c | 152 +++++++++++++++++++++++++++++++++++++
 6 files changed, 319 insertions(+), 10 deletions(-)
 create mode 100644 samples/bpf/xdp_fdb.bpf.c
 create mode 100644 samples/bpf/xdp_fdb_user.c

2.34.1