[PATCH net-next v2 0/2] Fix pinning devmaps

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Fix devmap pinning and reloading. The kernel adds BPF_F_RDONLY_PROG to
all devmaps when created, but libbpf checks that user flags match pinned
map flags when using LIBBPF_PIN_BY_NAME, so reusing pinned devmaps
doesn't work, failing with an error like:

    libbpf: couldn't reuse pinned map at '/sys/fs/bpf/dev_map':
    parameter mismatch

Work around this by ignoring RDONLY_PROG in the compat check in libbpf.

Changes since v1:
- Fixed a broken import
- Fixed style issues


Pramukh Naduthota (2):
  Ignore RDONLY_PROG for devmaps in libbpf to allow re-loading of pinned
    devmaps
  Add a selftest for devmap pinning.

 tools/lib/bpf/libbpf.c                        |  8 +++++++-
 .../testing/selftests/bpf/prog_tests/devmap.c | 20 +++++++++++++++++++
 .../selftests/bpf/progs/test_pinned_devmap.c  | 17 ++++++++++++++++
 3 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/devmap.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_pinned_devmap.c

-- 
2.30.2




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