70 lines · c
1// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)2 3#include "util/bpf_map.h"4#include <bpf/bpf.h>5#include <bpf/libbpf.h>6#include <linux/err.h>7#include <linux/kernel.h>8#include <stdbool.h>9#include <stdlib.h>10#include <unistd.h>11 12static bool bpf_map__is_per_cpu(enum bpf_map_type type)13{14 return type == BPF_MAP_TYPE_PERCPU_HASH ||15 type == BPF_MAP_TYPE_PERCPU_ARRAY ||16 type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||17 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;18}19 20static void *bpf_map__alloc_value(const struct bpf_map *map)21{22 if (bpf_map__is_per_cpu(bpf_map__type(map)))23 return malloc(round_up(bpf_map__value_size(map), 8) *24 sysconf(_SC_NPROCESSORS_CONF));25 26 return malloc(bpf_map__value_size(map));27}28 29int bpf_map__fprintf(struct bpf_map *map, FILE *fp)30{31 void *prev_key = NULL, *key, *value;32 int fd = bpf_map__fd(map), err;33 int printed = 0;34 35 if (fd < 0)36 return fd;37 38 err = -ENOMEM;39 key = malloc(bpf_map__key_size(map));40 if (key == NULL)41 goto out;42 43 value = bpf_map__alloc_value(map);44 if (value == NULL)45 goto out_free_key;46 47 while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {48 int intkey = *(int *)key;49 50 if (!bpf_map_lookup_elem(fd, key, value)) {51 bool boolval = *(bool *)value;52 if (boolval)53 printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);54 } else {55 printed += fprintf(fp, "[%d] = ERROR,\n", intkey);56 }57 58 prev_key = key;59 }60 61 if (err == ENOENT)62 err = printed;63 64 free(value);65out_free_key:66 free(key);67out:68 return err;69}70