From 3b34d2972612299fb38ad7f3c2bc62c2d03237f3 Mon Sep 17 00:00:00 2001 From: Martin Kelly Date: Mon, 25 Sep 2023 14:50:38 -0700 Subject: libbpf: Add ring__avail_data_size Add ring__avail_data_size for querying the currently available data in the ringbuffer, similar to the BPF_RB_AVAIL_DATA flag in bpf_ringbuf_query. This is racy during ongoing operations but is still useful for overall information on how a ringbuffer is behaving. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-8-martin.kelly@crowdstrike.com --- tools/lib/bpf/ringbuf.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'tools/lib/bpf/ringbuf.c') diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c index d14a607f6b66..07fbc6adcdd9 100644 --- a/tools/lib/bpf/ringbuf.c +++ b/tools/lib/bpf/ringbuf.c @@ -352,6 +352,15 @@ unsigned long ring__producer_pos(const struct ring *r) return smp_load_acquire(r->producer_pos); } +size_t ring__avail_data_size(const struct ring *r) +{ + unsigned long cons_pos, prod_pos; + + cons_pos = ring__consumer_pos(r); + prod_pos = ring__producer_pos(r); + return prod_pos - cons_pos; +} + static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb) { if (rb->consumer_pos) { -- cgit v1.2.3