kernel/tools/testing/selftests/bpf/prog_tests/section_names.c, branch linux-6.2.y

libbpf: Add support for BPF XDP link

2020-07-26T03:37:02Z

Sync UAPI header and add support for using bpf_link-based XDP attachment. Make xdp/ prog type set expected attach type. Kernel didn't enforce attach_type for XDP programs before, so there is no backwards compatiblity issues there. Also fix section_names selftest to recognize that xdp prog types now have expected attach type. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200722064603.3350758-8-andriin@fb.com

libbpf: Always specify expected_attach_type on program load if supported

2020-04-15T11:22:43Z

For some types of BPF programs that utilize expected_attach_type, libbpf won't set load_attr.expected_attach_type, even if expected_attach_type is known from section definition. This was done to preserve backwards compatibility with old kernels that didn't recognize expected_attach_type attribute yet (which was added in 5e43f899b03a ("bpf: Check attach type at prog load time"). But this is problematic for some BPF programs that utilize newer features that require kernel to know specific expected_attach_type (e.g., extended set of return codes for cgroup_skb/egress programs). This patch makes libbpf specify expected_attach_type by default, but also detect support for this field in kernel and not set it during program load. This allows to have a good metadata for bpf_program (e.g., bpf_program__get_extected_attach_type()), but still work with old kernels (for cases where it can work at all). Additionally, due to expected_attach_type being always set for recognized program types, bpf_program__attach_cgroup doesn't have to do extra checks to determine correct attach type, so remove that additional logic. Also adjust section_names selftest to account for this change. More detailed discussion can be found in [0]. [0] https://lore.kernel.org/bpf/20200412003604.GA15986@rdna-mbp.dhcp.thefacebook.com/ Fixes: 5cf1e9145630 ("bpf: cgroup inet skb programs can return 0 to 3") Fixes: 5e43f899b03a ("bpf: Check attach type at prog load time") Reported-by: Andrey Ignatov Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Song Liu Acked-by: Andrey Ignatov Link: https://lore.kernel.org/bpf/20200414182645.1368174-1-andriin@fb.com

selftests/bpf: Move test_section_names into test_progs and fix it

2019-10-23T17:06:46Z

Make test_section_names into test_progs test. Also fix ESRCH expected results. Add uprobe/uretprobe and tp/raw_tp test cases. Fixes: dd4436bb8383 ("libbpf: Teach bpf_object__open to guess program types") Reported-by: kernel test robot Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191023060913.1713817-1-andriin@fb.com