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libbpf: Add ring__size

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Add ring__size to get the total size of a given ringbuffer.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-10-martin.kelly@crowdstrike.com
This commit is contained in:
Martin Kelly 2023-09-25 14:50:40 -07:00 committed by Andrii Nakryiko
parent f3a01d385f
commit e79abf717f
3 changed files with 16 additions and 0 deletions
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10
tools/lib/bpf/libbpf.h
View file

@ -1293,6 +1293,16 @@ LIBBPF_API unsigned long ring__producer_pos(const struct ring *r);
*/
LIBBPF_API size_t ring__avail_data_size(const struct ring *r);
/**
* @brief **ring__size()** returns the total size of the ringbuffer's map data
* area (excluding special producer/consumer pages). Effectively this gives the
* amount of usable bytes of data inside the ringbuffer.
*
* @param r A ringbuffer object.
* @return The total size of the ringbuffer map data area.
*/
LIBBPF_API size_t ring__size(const struct ring *r);
struct user_ring_buffer_opts {
size_t sz; /* size of this struct, for forward/backward compatibility */
};

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

@ -403,5 +403,6 @@ LIBBPF_1.3.0 {
ring__avail_data_size;
ring__consumer_pos;
ring__producer_pos;
ring__size;
ring_buffer__ring;
} LIBBPF_1.2.0;

5
tools/lib/bpf/ringbuf.c
View file

@ -361,6 +361,11 @@ size_t ring__avail_data_size(const struct ring *r)
return prod_pos - cons_pos;
}
size_t ring__size(const struct ring *r)
{
return r->mask + 1;
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {