From 1c97f6afd73934881ae8514c51efc8e162b4b406 Mon Sep 17 00:00:00 2001 From: Martin Kelly Date: Mon, 25 Sep 2023 14:50:34 -0700 Subject: libbpf: Add ring_buffer__ring Add a new function ring_buffer__ring, which exposes struct ring * to the user, representing a single ringbuffer. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-4-martin.kelly@crowdstrike.com --- tools/lib/bpf/libbpf.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'tools/lib/bpf/libbpf.h') diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 0e52621cba43..de3ef59b9641 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -1229,6 +1229,7 @@ LIBBPF_API int bpf_tc_query(const struct bpf_tc_hook *hook, /* Ring buffer APIs */ struct ring_buffer; +struct ring; struct user_ring_buffer; typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size); @@ -1249,6 +1250,20 @@ LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms); LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb); LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb); +/** + * @brief **ring_buffer__ring()** returns the ringbuffer object inside a given + * ringbuffer manager representing a single BPF_MAP_TYPE_RINGBUF map instance. + * + * @param rb A ringbuffer manager object. + * @param idx An index into the ringbuffers contained within the ringbuffer + * manager object. The index is 0-based and corresponds to the order in which + * ring_buffer__add was called. + * @return A ringbuffer object on success; NULL and errno set if the index is + * invalid. + */ +LIBBPF_API struct ring *ring_buffer__ring(struct ring_buffer *rb, + unsigned int idx); + struct user_ring_buffer_opts { size_t sz; /* size of this struct, for forward/backward compatibility */ }; -- cgit