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| author | Martin Kelly <martin.kelly@crowdstrike.com> | 2023-09-25 23:50:36 +0200 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2023-09-26 01:22:42 +0200 |
| commit | 059a8c0c5acd37ecfa64f1832e8765d30f253ce8 (patch) | |
| tree | 121e16ee53c4f30fdcac2e5452510c153c6ce7aa /tools/lib/bpf/ringbuf.c | |
| parent | selftests/bpf: Add tests for ring_buffer__ring (diff) | |
| download | linux-059a8c0c5acd37ecfa64f1832e8765d30f253ce8.tar.xz linux-059a8c0c5acd37ecfa64f1832e8765d30f253ce8.zip | |
libbpf: Add ring__producer_pos, ring__consumer_pos
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
Diffstat (limited to 'tools/lib/bpf/ringbuf.c')
| -rw-r--r-- | tools/lib/bpf/ringbuf.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c index efde453395b0..d14a607f6b66 100644 --- a/tools/lib/bpf/ringbuf.c +++ b/tools/lib/bpf/ringbuf.c @@ -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) { |