Merge branch 'bpftool-flow-dissector'

Stanislav Fomichev says:

====================
v5 changes:
* FILE -> PATH for load/loadall (can be either file or directory now)
* simpler implementation for __bpf_program__pin_name
* removed p_err for REQ_ARGS checks
* parse_atach_detach_args -> parse_attach_detach_args
* for -> while in bpf_object__pin_{programs,maps} recovery

v4 changes:
* addressed another round of comments/style issues from Jakub Kicinski &
  Quentin Monnet (thanks!)
* implemented bpf_object__pin_maps and bpf_object__pin_programs helpers and
  used them in bpf_program__pin
* added new pin_name to bpf_program so bpf_program__pin
  works with sections that contain '/'
* moved *loadall* command implementation into a separate patch
* added patch that implements *pinmaps* to pin maps when doing
  load/loadall

v3 changes:
* (maybe) better cleanup for partial failure in bpf_object__pin
* added special case in bpf_program__pin for programs with single
  instances

v2 changes:
* addressed comments/style issues from Jakub Kicinski & Quentin Monnet
* removed logic that populates jump table
* added cleanup for partial failure in bpf_object__pin

This patch series adds support for loading and attaching flow dissector
programs from the bpftool:

* first patch fixes flow dissector section name in the selftests (so
  libbpf auto-detection works)
* second patch adds proper cleanup to bpf_object__pin, parts of which are now
  being used to attach all flow dissector progs/maps
* third patch adds special case in bpf_program__pin for programs with
  single instances (we don't create <prog>/0 pin anymore, just <prog>)
* forth patch adds pin_name to the bpf_program struct
  which is now used as a pin name in bpf_program__pin et al
* fifth patch adds *loadall* command that pins all programs, not just
  the first one
* sixth patch adds *pinmaps* argument to load/loadall to let users pin
  all maps of the obj file
* seventh patch adds actual flow_dissector support to the bpftool and
  an example
====================

Acked-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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