From: Alexei Starovoitov <ast@kernel.org>
Date: Sun, 11 Oct 2020 19:14:36 +0000 (-0700)
Subject: Merge branch 'samples: bpf: Refactor XDP programs with libbpf'
X-Git-Tag: v5.10-rc1~107^2~16^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=52b07e56af6414a1623901e18bf6a217ec33c11f;p=thirdparty%2Fkernel%2Flinux.git

Merge branch 'samples: bpf: Refactor XDP programs with libbpf'

"Daniel T. Lee" says:

====================
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
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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52b07e56af6414a1623901e18bf6a217ec33c11f