xref: /linux/tools/testing/selftests/bpf/netcnt_common.h (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)
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