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libbpf: Add ring__consume_n / ring_buffer__consume_n

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Introduce a new API to consume items from a ring buffer, limited to a
specified amount, and return to the caller the actual number of items
consumed.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/lkml/20240310154726.734289-1-andrea.righi@canonical.com/T
Link: https://lore.kernel.org/bpf/20240406092005.92399-4-andrea.righi@canonical.com
This commit is contained in:
Andrea Righi
2024-04-06 11:15:43 +02:00
committed by Andrii Nakryiko
parent 98de9ace4d
commit b521a722b9
3 changed files with 50 additions and 3 deletions
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12
src/libbpf.h
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@@ -1293,6 +1293,7 @@ LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
ring_buffer_sample_fn sample_cb, void *ctx);
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__consume_n(struct ring_buffer *rb, size_t n);
LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb);
/**
@@ -1367,6 +1368,17 @@ LIBBPF_API int ring__map_fd(const struct ring *r);
*/
LIBBPF_API int ring__consume(struct ring *r);
/**
* @brief **ring__consume_n()** consumes up to a requested amount of items from
* a ringbuffer without event polling.
*
* @param r A ringbuffer object.
* @param n Maximum amount of items to consume.
* @return The number of items consumed, or a negative number if any of the
* callbacks return an error.
*/
LIBBPF_API int ring__consume_n(struct ring *r, size_t n);
struct user_ring_buffer_opts {
size_t sz; /* size of this struct, for forward/backward compatibility */
};