kernel/linux.git/tools/lib/bpf/libbpf.c, branch v5.8.2

libbpf: Adjust SEC short cut for expected attach type BPF_XDP_DEVMAP

2020-06-25T20:36:00+00:00

Adjust the SEC("xdp_devmap/") prog type prefix to contain a slash "/" for expected attach type BPF_XDP_DEVMAP. This is consistent with other prog types like tracing. Fixes: 2778797037a6 ("libbpf: Add SEC name for xdp programs attached to device map") Suggested-by: Andrii Nakryiko Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/159309521882.821855.6873145686353617509.stgit@firesoul

libbpf: Fix CO-RE relocs against .text section

2020-06-24T00:01:43+00:00

bpf_object__find_program_by_title(), used by CO-RE relocation code, doesn't return .text "BPF program", if it is a function storage for sub-programs. Because of that, any CO-RE relocation in helper non-inlined functions will fail. Fix this by searching for .text-corresponding BPF program manually. Adjust one of bpf_iter selftest to exhibit this pattern. Fixes: ddc7c3042614 ("libbpf: implement BPF CO-RE offset relocation algorithm") Reported-by: Yonghong Song Signed-off-by: Andrii Nakryiko Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20200619230423.691274-1-andriin@fb.com

libbpf: Support pre-initializing .bss global variables

2020-06-12T22:27:47+00:00

Remove invalid assumption in libbpf that .bss map doesn't have to be updated in kernel. With addition of skeleton and memory-mapped initialization image, .bss doesn't have to be all zeroes when BPF map is created, because user-code might have initialized those variables from user-space. Fixes: eba9c5f498a1 ("libbpf: Refactor global data map initialization") Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200612194504.557844-1-andriin@fb.com

libbpf: Add support for bpf_link-based netns attachment

2020-06-01T22:21:03+00:00

Add bpf_program__attach_nets(), which uses LINK_CREATE subcommand to create an FD-based kernel bpf_link, for attach types tied to network namespace, that is BPF_FLOW_DISSECTOR for the moment. Signed-off-by: Jakub Sitnicki Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200531082846.2117903-7-jakub@cloudflare.com

libbpf: Add SEC name for xdp programs attached to device map

2020-06-01T21:48:32+00:00

Support SEC("xdp_devmap*") as a short cut for loading the program with type BPF_PROG_TYPE_XDP and expected attach type BPF_XDP_DEVMAP. Signed-off-by: David Ahern Signed-off-by: Alexei Starovoitov Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/20200529220716.75383-5-dsahern@kernel.org Signed-off-by: Alexei Starovoitov

libbpf: Fix perf_buffer__free() API for sparse allocs

2020-06-01T21:38:21+00:00

In case the cpu_bufs are sparsely allocated they are not all free'ed. These changes will fix this. Fixes: fb84b8224655 ("libbpf: add perf buffer API") Signed-off-by: Eelco Chaudron Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/159056888305.330763.9684536967379110349.stgit@ebuild Signed-off-by: Alexei Starovoitov

libbpf: Add API to consume the perf ring buffer content

2020-06-01T21:38:19+00:00

This new API, perf_buffer__consume, can be used as follows: - When you have a perf ring where wakeup_events is higher than 1, and you have remaining data in the rings you would like to pull out on exit (or maybe based on a timeout). - For low latency cases where you burn a CPU that constantly polls the queues. Signed-off-by: Eelco Chaudron Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/159048487929.89441.7465713173442594608.stgit@ebuild Signed-off-by: Alexei Starovoitov

bpf, libbpf: Enable get{peer, sock}name attach types

2020-05-19T18:32:04+00:00

Trivial patch to add the new get{peer,sock}name attach types to the section definitions in order to hook them up to sock_addr cgroup program type. Signed-off-by: Daniel Borkmann Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Acked-by: Andrey Ignatov Link: https://lore.kernel.org/bpf/7fcd4b1e41a8ebb364754a5975c75a7795051bd2.1589841594.git.daniel@iogearbox.net

bpf: Change btf_iter func proto prefix to "bpf_iter_"

2020-05-13T19:30:49+00:00

This is to be consistent with tracing and lsm programs which have prefix "bpf_trace_" and "bpf_lsm_" respectively. Suggested-by: Alexei Starovoitov Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200513180216.2949387-1-yhs@fb.com

libbpf: Fix probe code to return EPERM if encountered

2020-05-13T08:29:54+00:00

When the probe code was failing for any reason ENOTSUP was returned, even if this was due to not having enough lock space. This patch fixes this by returning EPERM to the user application, so it can respond and increase the RLIMIT_MEMLOCK size. Signed-off-by: Eelco Chaudron Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/158927424896.2342.10402475603585742943.stgit@ebuild