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authorMartin Kelly <martin.kelly@crowdstrike.com>2023-09-25 23:50:40 +0200
committerAndrii Nakryiko <andrii@kernel.org>2023-09-26 01:22:43 +0200
commite79abf717fce6439022547124571dfe17f2ac15a (patch)
treed677165172cc96d059ac7fc0ac61db88f7eccb05 /tools/lib
parentselftests/bpf: Add tests for ring__avail_data_size (diff)
downloadlinux-e79abf717fce6439022547124571dfe17f2ac15a.tar.xz
linux-e79abf717fce6439022547124571dfe17f2ac15a.zip
libbpf: Add ring__size
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
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/libbpf.h10
-rw-r--r--tools/lib/bpf/libbpf.map1
-rw-r--r--tools/lib/bpf/ringbuf.c5
3 files changed, 16 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index d60254c5edc6..53e2a645c560 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -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 */
};
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 5184c94c0502..a116d0bb3c5d 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -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;
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index 07fbc6adcdd9..98d0767dbb50 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -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) {