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libbpf: Add ring__producer_pos, ring__consumer_pos

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Add APIs to get the producer and consumer position for 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/20230925215045.2375758-6-martin.kelly@crowdstrike.com
This commit is contained in:
Martin Kelly
2023-09-25 14:50:36 -07:00
committed by Andrii Nakryiko
parent a20576f5f2
commit 2ad16b970a
3 changed files with 34 additions and 0 deletions
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14
src/ringbuf.c
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@@ -338,6 +338,20 @@ struct ring *ring_buffer__ring(struct ring_buffer *rb, unsigned int idx)
return rb->rings[idx];
}
unsigned long ring__consumer_pos(const struct ring *r)
{
/* Synchronizes with smp_store_release() in ringbuf_process_ring(). */
return smp_load_acquire(r->consumer_pos);
}
unsigned long ring__producer_pos(const struct ring *r)
{
/* Synchronizes with smp_store_release() in __bpf_ringbuf_reserve() in
* the kernel.
*/
return smp_load_acquire(r->producer_pos);
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {