To avoid confusion caused by the increasing fragmentation of the BPF
Loader program, this commit would like to convert the previous bpf_load
loader with the libbpf loader.
Thanks to libbpf's bpf_link interface, managing the tracepoint BPF
program is much easier. bpf_program__attach_tracepoint manages the
enable of tracepoint event and attach of BPF programs to it with a
single interface bpf_link, so there is no need to manage event_fd and
prog_fd separately.
And due to addition of generic bpf_program__attach() to libbpf, it is
now possible to attach BPF programs with __attach() instead of
explicitly calling __attach_<type>().
This patchset refactors xdp_monitor with using this libbpf API, and the
bpf_load is removed and migrated to libbpf. Also, attach_tracepoint()
is replaced with the generic __attach() method in xdp_redirect_cpu.
Moreover, maps in kern program have been converted to BTF-defined map.
---
Changes in v2:
- added cleanup logic for bpf_link and bpf_object in xdp_monitor
- program section match with bpf_program__is_<type> instead of strncmp
- revert BTF key/val type to default of BPF_MAP_TYPE_PERF_EVENT_ARRAY
- split increment into seperate satement
- refactor pointer array initialization
- error code cleanup
Daniel T. Lee (3):
samples: bpf: Refactor xdp_monitor with libbpf
samples: bpf: Replace attach_tracepoint() to attach() in
xdp_redirect_cpu
samples: bpf: refactor XDP kern program maps with BTF-defined map
samples/bpf/Makefile | 4 +-
samples/bpf/xdp_monitor_kern.c | 60 +++++------
samples/bpf/xdp_monitor_user.c | 159 +++++++++++++++++++++-------
samples/bpf/xdp_redirect_cpu_user.c | 153 +++++++++++++-------------
samples/bpf/xdp_sample_pkts_kern.c | 14 ++-
samples/bpf/xdp_sample_pkts_user.c | 1 -
6 files changed, 230 insertions(+), 161 deletions(-)
--
2.25.1
