1// SPDX-License-Identifier: GPL-2.0
 2#ifndef __NETCNT_COMMON_H
 3#define __NETCNT_COMMON_H
 4
 5#include <linux/types.h>
 6
 7#define MAX_PERCPU_PACKETS 32
 8
 9/* sizeof(struct bpf_local_storage_elem):
10 *
11 * It is about 128 bytes on x86_64 and 512 bytes on s390x, but allocate more to
12 * account for possible layout changes, different architectures, etc.
13 * The kernel will wrap up to PAGE_SIZE internally anyway.
14 */
15#define SIZEOF_BPF_LOCAL_STORAGE_ELEM		768
16
17/* Try to estimate kernel's BPF_LOCAL_STORAGE_MAX_VALUE_SIZE: */
18#define BPF_LOCAL_STORAGE_MAX_VALUE_SIZE	(0xFFFF - \
19						 SIZEOF_BPF_LOCAL_STORAGE_ELEM)
20
21#define PCPU_MIN_UNIT_SIZE			32768
22
23union percpu_net_cnt {
24	struct {
25		__u64 packets;
26		__u64 bytes;
27
28		__u64 prev_ts;
29
30		__u64 prev_packets;
31		__u64 prev_bytes;
32	};
33	__u8 data[PCPU_MIN_UNIT_SIZE];
34};
35
36union net_cnt {
37	struct {
38		__u64 packets;
39		__u64 bytes;
40	};
41	__u8 data[BPF_LOCAL_STORAGE_MAX_VALUE_SIZE];
42};
43
44#endif