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
