[PATCH v3 net-next 0/4] bpftool: cgroup bpf operations

[Roman Gushchin]

This patchset adds basic cgroup bpf operations to bpftool.

Right now there is no convenient way to perform these operations.
The /samples/bpf/load_sock_ops.c implements attach/detacg operations,
but only for BPF_CGROUP_SOCK_OPS programs. Bps (part of bcc) implements
bpf introspection, but lacks any cgroup-related specific.

I find having a tool to perform these basic operations in the kernel tree
very useful, as it can be used in the corresponding bpf documentation
without creating additional dependencies. And bpftool seems to be
a right tool to extend with such functionality.

v3:
  - SRC replaced with OBJ in prog load docs
  - Output unknown attach type in hex
  - License header in SPDX format
  - Minor style fixes (e.g. variable reordering)

v2:
  - Added prog load operations
  - All cgroup operations are looking like bpftool cgroup <command>
  - All cgroup-related stuff is moved to a separate file
  - Added support for attach flags
  - Added support for attaching/detaching programs by id, pinned name, etc
  - Changed cgroup detach arguments order
  - Added empty json output for succesful programs
  - Style fixed: includes order, strncmp and macroses, error handling
  - Added man pages

v1:
  https://lwn.net/Articles/740366/

Roman Gushchin (4):
  libbpf: add ability to guess program type based on section name
  libbpf: prefer global symbols as bpf program name source
  bpftool: implement prog load command
  bpftool: implement cgroup bpf operations

 tools/bpf/bpftool/Documentation/bpftool-cgroup.rst |  92 +++++++
 tools/bpf/bpftool/Documentation/bpftool-map.rst    |   2 +-
 tools/bpf/bpftool/Documentation/bpftool-prog.rst   |  12 +-
 tools/bpf/bpftool/Documentation/bpftool.rst        |   8 +-
 tools/bpf/bpftool/cgroup.c                         | 300 +++++++++++++++++++++
 tools/bpf/bpftool/common.c                         |  71 ++---
 tools/bpf/bpftool/main.c                           |   3 +-
 tools/bpf/bpftool/main.h                           |   2 +
 tools/bpf/bpftool/prog.c                           |  29 +-
 tools/lib/bpf/libbpf.c                             |  53 ++++
 10 files changed, 533 insertions(+), 39 deletions(-)
 create mode 100644 tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
 create mode 100644 tools/bpf/bpftool/cgroup.c

-- 
2.14.3