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
23 union 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
36 union net_cnt {
37 struct {
38 __u64 packets;
39 __u64 bytes;
40 };
41 __u8 data[BPF_LOCAL_STORAGE_MAX_VALUE_SIZE];
42 };
43
44 #endif
45
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