[V3 PATCH net-next 0/5] xdp: more work on xdp tracepoints

[Jesper Dangaard Brouer <brouer@redhat.com>]

More work on streamlining and performance optimizing the tracepoints
for XDP.

I've created a simple xdp_monitor application that uses this
tracepoint, and prints statistics. Available at github:

https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_kern.c
https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/samples/bpf/xdp_monitor_user.c

The improvement over tracepoint with strcpy: 9810372 - 8428762 = +1381610 pps faster
 - (1/9810372 - 1/8428762)*10^9 = -16.7 nanosec
 - 100-(8428762/9810372*100) = strcpy-trace is 14.08% slower
 - 981037/8428762*100 = removing strcpy made it 11.64% faster

V3: Fix merge conflict with commit e4a8e817d3cb ("bpf: misc xdp redirect cleanups")
V2: Change trace_xdp_redirect() to align with args of trace_xdp_exception()

---

Jesper Dangaard Brouer (5):
      xdp: remove bpf_warn_invalid_xdp_redirect
      xdp: make generic xdp redirect use tracepoint trace_xdp_redirect
      ixgbe: use return codes from ndo_xdp_xmit that are distinguishable
      xdp: remove net_device names from xdp_redirect tracepoint
      xdp: get tracepoints xdp_exception and xdp_redirect in sync


 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |    4 +-
 include/linux/filter.h                        |    3 +-
 include/trace/events/xdp.h                    |   36 ++++++++++---------
 net/core/dev.c                                |    4 +-
 net/core/filter.c                             |   47 +++++++++++++------------
 5 files changed, 49 insertions(+), 45 deletions(-)