tools/testing/selftests/bpf/netcnt_common.h

   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