Some BPF helper cleanups

This series contains a couple of misc cleanups and improvements for BPF helpers. For details please see individual patches. We let this also sit for a few days with Fengguang's kbuild test robot, and there were no issues seen (besides one false positive, see last one for details).

Thanks!

Daniel Borkmann (4):
bpf: minor cleanups in helpers
bpf: add BPF_SIZEOF and BPF_FIELD_SIZEOF macros
bpf: add own ctx rewriter on ifindex for clsact progs
bpf: add BPF_CALL_x macros for declaring helpers

 include/linux/filter.h   |  64 ++++++++++++++++
 kernel/bpf/core.c        |   2 +-
 kernel/bpf/helpers.c     |  52 ++++---------
 kernel/bpf/stackmap.c    |   5 +-
 kernel/trace/bpf_trace.c |  87 +++++++++++-----------
 net/core/filter.c        | 188 ++++++++++++++++++++++-------------------------
 6 files changed, 213 insertions(+), 185 deletions(-)

1.9.3