Commit e79abf71 authored by Martin Kelly's avatar Martin Kelly Committed by Andrii Nakryiko
Browse files

libbpf: Add ring__size 



Add ring__size to get the total size of a given ringbuffer.

Signed-off-by: default avatarMartin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-10-martin.kelly@crowdstrike.com
parent f3a01d38

tools/lib/bpf/libbpf.h

+10 −0
Original line number Diff line number Diff line
@@ -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 */

};

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -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;

tools/lib/bpf/ringbuf.c

+5 −0
Original line number Diff line number Diff line
@@ -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) {