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authorMartin Kelly <martin.kelly@crowdstrike.com>2023-09-25 23:50:34 +0200
committerAndrii Nakryiko <andrii@kernel.org>2023-09-26 01:22:42 +0200
commit1c97f6afd73934881ae8514c51efc8e162b4b406 (patch)
treeddb46398ee77cdddd56d4ca5380a8694141856bb /tools/lib
parentlibbpf: Switch rings to array of pointers (diff)
downloadlinux-1c97f6afd73934881ae8514c51efc8e162b4b406.tar.xz
linux-1c97f6afd73934881ae8514c51efc8e162b4b406.zip
libbpf: Add ring_buffer__ring
Add a new function ring_buffer__ring, which exposes struct ring * to the user, representing a single ringbuffer. Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20230925215045.2375758-4-martin.kelly@crowdstrike.com
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/libbpf.h15
-rw-r--r--tools/lib/bpf/libbpf.map1
-rw-r--r--tools/lib/bpf/ringbuf.c8
3 files changed, 24 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 0e52621cba43..de3ef59b9641 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -1229,6 +1229,7 @@ LIBBPF_API int bpf_tc_query(const struct bpf_tc_hook *hook,
/* Ring buffer APIs */
struct ring_buffer;
+struct ring;
struct user_ring_buffer;
typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size);
@@ -1249,6 +1250,20 @@ LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb);
+/**
+ * @brief **ring_buffer__ring()** returns the ringbuffer object inside a given
+ * ringbuffer manager representing a single BPF_MAP_TYPE_RINGBUF map instance.
+ *
+ * @param rb A ringbuffer manager object.
+ * @param idx An index into the ringbuffers contained within the ringbuffer
+ * manager object. The index is 0-based and corresponds to the order in which
+ * ring_buffer__add was called.
+ * @return A ringbuffer object on success; NULL and errno set if the index is
+ * invalid.
+ */
+LIBBPF_API struct ring *ring_buffer__ring(struct ring_buffer *rb,
+ unsigned int idx);
+
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 57712321490f..7a7370c2bc25 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -400,4 +400,5 @@ LIBBPF_1.3.0 {
bpf_program__attach_netfilter;
bpf_program__attach_tcx;
bpf_program__attach_uprobe_multi;
+ ring_buffer__ring;
} LIBBPF_1.2.0;
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index 94d11fb44a49..efde453395b0 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -330,6 +330,14 @@ int ring_buffer__epoll_fd(const struct ring_buffer *rb)
return rb->epoll_fd;
}
+struct ring *ring_buffer__ring(struct ring_buffer *rb, unsigned int idx)
+{
+ if (idx >= rb->ring_cnt)
+ return errno = ERANGE, NULL;
+
+ return rb->rings[idx];
+}
+
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {