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libbpf: Add ring_buffer__ring

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Add a new function ring_buffer__ring, which exposes struct ring * to the
user, representing a single ringbuffer.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-4-martin.kelly@crowdstrike.com
This commit is contained in:
Martin Kelly 2023-09-25 14:50:34 -07:00 committed by Andrii Nakryiko
parent ef3b82003e
commit 1c97f6afd7
3 changed files with 24 additions and 0 deletions
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15
tools/lib/bpf/libbpf.h
View file

@ -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 */
};

1
tools/lib/bpf/libbpf.map
View file

@ -400,4 +400,5 @@ LIBBPF_1.3.0 {
bpf_program__attach_netfilter;
bpf_program__attach_tcx;
bpf_program__attach_uprobe_multi;
ring_buffer__ring;
} LIBBPF_1.2.0;

8
tools/lib/bpf/ringbuf.c
View file

@ -330,6 +330,14 @@ int ring_buffer__epoll_fd(const struct ring_buffer *rb)
return rb->epoll_fd;
}
struct ring *ring_buffer__ring(struct ring_buffer *rb, unsigned int idx)
{
if (idx >= rb->ring_cnt)
return errno = ERANGE, NULL;
return rb->rings[idx];
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {