[bpf-next,0/4] bpftool: Fix skeletons compilation for older kernels

Message

Quentin Monnet May 12, 2023, 10:33 a.m. UTC

At runtime, bpftool may run its own BPF programs to get the pids of
processes referencing BPF programs, or to profile programs. The skeletons
for these programs rely on a vmlinux.h header and may fail to compile when
building bpftool on hosts running older kernels, where some structs or
enums are not defined. In this set, we address this issue by using local
definitions for struct perf_event, struct bpf_perf_link,
BPF_LINK_TYPE_PERF_EVENT (pids.bpf.c) and struct bpf_perf_event_value
(profiler.bpf.c).

This set contains patches 1 to 3 from Alexander Lobakin's series, "bpf:
random unpopular userspace fixes (32 bit et al)" (v2) [0], from April 2022.
An additional patch defines a local version of BPF_LINK_TYPE_PERF_EVENT in
bpftool's pids.bpf.c.

[0] https://lore.kernel.org/bpf/[e-mail]/

Cc: Alexander Lobakin <[e-mail]>
Cc: Michal Suchánek <[e-mail]>

Alexander Lobakin (3):
  bpftool: use a local copy of perf_event to fix accessing ::bpf_cookie
  bpftool: define a local bpf_perf_link to fix accessing its fields
  bpftool: use a local bpf_perf_event_value to fix accessing its fields

Quentin Monnet (1):
  bpftool: Use a local copy of BPF_LINK_TYPE_PERF_EVENT in
    pid_iter.bpf.c

 tools/bpf/bpftool/skeleton/pid_iter.bpf.c | 26 +++++++++++++++++-----
 tools/bpf/bpftool/skeleton/profiler.bpf.c | 27 ++++++++++++++---------
 2 files changed, 38 insertions(+), 15 deletions(-)