bpf_iter_bpf_percpu_hash_map.c (969B)
1// SPDX-License-Identifier: GPL-2.0 2/* Copyright (c) 2020 Facebook */ 3#include "bpf_iter.h" 4#include <bpf/bpf_helpers.h> 5#include <bpf/bpf_tracing.h> 6 7char _license[] SEC("license") = "GPL"; 8 9struct key_t { 10 int a; 11 int b; 12 int c; 13}; 14 15struct { 16 __uint(type, BPF_MAP_TYPE_PERCPU_HASH); 17 __uint(max_entries, 3); 18 __type(key, struct key_t); 19 __type(value, __u32); 20} hashmap1 SEC(".maps"); 21 22/* will set before prog run */ 23volatile const __u32 num_cpus = 0; 24 25/* will collect results during prog run */ 26__u32 key_sum_a = 0, key_sum_b = 0, key_sum_c = 0; 27__u32 val_sum = 0; 28 29SEC("iter/bpf_map_elem") 30int dump_bpf_percpu_hash_map(struct bpf_iter__bpf_map_elem *ctx) 31{ 32 struct key_t *key = ctx->key; 33 void *pptr = ctx->value; 34 __u32 step; 35 int i; 36 37 if (key == (void *)0 || pptr == (void *)0) 38 return 0; 39 40 key_sum_a += key->a; 41 key_sum_b += key->b; 42 key_sum_c += key->c; 43 44 step = 8; 45 for (i = 0; i < num_cpus; i++) { 46 val_sum += *(__u32 *)pptr; 47 pptr += step; 48 } 49 return 0; 50}