bpf: btf: Add BTF support to libbpf
If the ".BTF" elf section exists, libbpf will try to create a btf_fd (through BPF_BTF_LOAD). If that fails, it will still continue loading the bpf prog/map without the BTF. If the bpf_object has a BTF loaded, it will create a map with the btf_fd. libbpf will try to figure out the btf_key_id and btf_value_id of a map by finding the BTF type with name "<map_name>_key" and "<map_name>_value". If they cannot be found, it will continue without using the BTF. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Alexei Starovoitov <ast@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau
Daniel Borkmann
parent
3bd86a8409
commit
8a138aed4a
7 changed files with 627 additions and 32 deletions
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@ -1 +1 @@
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libbpf-y := libbpf.o bpf.o nlattr.o
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libbpf-y := libbpf.o bpf.o nlattr.o btf.o
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@ -73,43 +73,76 @@ static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
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return syscall(__NR_bpf, cmd, attr, size);
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}
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int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags, int node)
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int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
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{
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__u32 name_len = name ? strlen(name) : 0;
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__u32 name_len = create_attr->name ? strlen(create_attr->name) : 0;
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union bpf_attr attr;
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memset(&attr, '\0', sizeof(attr));
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attr.map_type = map_type;
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attr.key_size = key_size;
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attr.value_size = value_size;
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attr.max_entries = max_entries;
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attr.map_flags = map_flags;
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memcpy(attr.map_name, name, min(name_len, BPF_OBJ_NAME_LEN - 1));
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if (node >= 0) {
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attr.map_flags |= BPF_F_NUMA_NODE;
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attr.numa_node = node;
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}
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attr.map_type = create_attr->map_type;
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attr.key_size = create_attr->key_size;
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attr.value_size = create_attr->value_size;
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attr.max_entries = create_attr->max_entries;
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attr.map_flags = create_attr->map_flags;
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memcpy(attr.map_name, create_attr->name,
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min(name_len, BPF_OBJ_NAME_LEN - 1));
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attr.numa_node = create_attr->numa_node;
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attr.btf_fd = create_attr->btf_fd;
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attr.btf_key_id = create_attr->btf_key_id;
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attr.btf_value_id = create_attr->btf_value_id;
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return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
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}
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int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags, int node)
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{
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struct bpf_create_map_attr map_attr = {};
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map_attr.name = name;
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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if (node >= 0) {
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map_attr.numa_node = node;
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map_attr.map_flags |= BPF_F_NUMA_NODE;
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}
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map(enum bpf_map_type map_type, int key_size,
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int value_size, int max_entries, __u32 map_flags)
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{
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return bpf_create_map_node(map_type, NULL, key_size, value_size,
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max_entries, map_flags, -1);
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struct bpf_create_map_attr map_attr = {};
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags)
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{
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return bpf_create_map_node(map_type, name, key_size, value_size,
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max_entries, map_flags, -1);
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struct bpf_create_map_attr map_attr = {};
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map_attr.name = name;
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map_attr.map_type = map_type;
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map_attr.map_flags = map_flags;
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map_attr.key_size = key_size;
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map_attr.value_size = value_size;
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map_attr.max_entries = max_entries;
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return bpf_create_map_xattr(&map_attr);
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}
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int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
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@ -573,3 +606,28 @@ int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
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close(sock);
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return ret;
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}
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int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
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bool do_log)
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{
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union bpf_attr attr = {};
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int fd;
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attr.btf = ptr_to_u64(btf);
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attr.btf_size = btf_size;
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retry:
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if (do_log && log_buf && log_buf_size) {
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attr.btf_log_level = 1;
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attr.btf_log_size = log_buf_size;
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attr.btf_log_buf = ptr_to_u64(log_buf);
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}
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fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
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if (fd == -1 && !do_log && log_buf && log_buf_size) {
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do_log = true;
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goto retry;
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}
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return fd;
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}
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@ -26,6 +26,20 @@
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#include <linux/bpf.h>
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#include <stddef.h>
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struct bpf_create_map_attr {
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const char *name;
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enum bpf_map_type map_type;
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__u32 map_flags;
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__u32 key_size;
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__u32 value_size;
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__u32 max_entries;
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__u32 numa_node;
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__u32 btf_fd;
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__u32 btf_key_id;
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__u32 btf_value_id;
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};
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int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr);
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int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
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int key_size, int value_size, int max_entries,
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__u32 map_flags, int node);
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@ -87,4 +101,6 @@ int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len);
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int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
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__u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt);
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int bpf_raw_tracepoint_open(const char *name, int prog_fd);
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int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
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bool do_log);
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#endif
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374
tools/lib/bpf/btf.c
Normal file
374
tools/lib/bpf/btf.c
Normal file
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@ -0,0 +1,374 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018 Facebook */
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <linux/err.h>
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#include <linux/btf.h>
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#include "btf.h"
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#include "bpf.h"
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#define elog(fmt, ...) { if (err_log) err_log(fmt, ##__VA_ARGS__); }
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define BTF_MAX_NR_TYPES 65535
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static struct btf_type btf_void;
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struct btf {
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union {
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struct btf_header *hdr;
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void *data;
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};
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struct btf_type **types;
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const char *strings;
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void *nohdr_data;
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uint32_t nr_types;
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uint32_t types_size;
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uint32_t data_size;
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int fd;
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};
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static const char *btf_name_by_offset(const struct btf *btf, uint32_t offset)
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{
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if (!BTF_STR_TBL_ELF_ID(offset) &&
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BTF_STR_OFFSET(offset) < btf->hdr->str_len)
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return &btf->strings[BTF_STR_OFFSET(offset)];
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else
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return NULL;
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}
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static int btf_add_type(struct btf *btf, struct btf_type *t)
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{
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if (btf->types_size - btf->nr_types < 2) {
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struct btf_type **new_types;
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u32 expand_by, new_size;
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if (btf->types_size == BTF_MAX_NR_TYPES)
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return -E2BIG;
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expand_by = max(btf->types_size >> 2, 16);
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new_size = min(BTF_MAX_NR_TYPES, btf->types_size + expand_by);
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new_types = realloc(btf->types, sizeof(*new_types) * new_size);
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if (!new_types)
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return -ENOMEM;
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if (btf->nr_types == 0)
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new_types[0] = &btf_void;
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btf->types = new_types;
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btf->types_size = new_size;
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}
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btf->types[++(btf->nr_types)] = t;
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return 0;
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}
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static int btf_parse_hdr(struct btf *btf, btf_print_fn_t err_log)
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{
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const struct btf_header *hdr = btf->hdr;
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u32 meta_left;
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if (btf->data_size < sizeof(struct btf_header)) {
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elog("BTF header not found\n");
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return -EINVAL;
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}
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if (hdr->magic != BTF_MAGIC) {
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elog("Invalid BTF magic:%x\n", hdr->magic);
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return -EINVAL;
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}
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if (hdr->version != BTF_VERSION) {
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elog("Unsupported BTF version:%u\n", hdr->version);
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return -ENOTSUP;
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}
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if (hdr->flags) {
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elog("Unsupported BTF flags:%x\n", hdr->flags);
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return -ENOTSUP;
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}
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meta_left = btf->data_size - sizeof(*hdr);
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if (!meta_left) {
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elog("BTF has no data\n");
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return -EINVAL;
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}
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if (meta_left < hdr->type_off) {
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elog("Invalid BTF type section offset:%u\n", hdr->type_off);
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return -EINVAL;
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}
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if (meta_left < hdr->str_off) {
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elog("Invalid BTF string section offset:%u\n", hdr->str_off);
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return -EINVAL;
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}
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if (hdr->type_off >= hdr->str_off) {
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elog("BTF type section offset >= string section offset. No type?\n");
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return -EINVAL;
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}
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if (hdr->type_off & 0x02) {
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elog("BTF type section is not aligned to 4 bytes\n");
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return -EINVAL;
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}
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btf->nohdr_data = btf->hdr + 1;
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return 0;
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}
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static int btf_parse_str_sec(struct btf *btf, btf_print_fn_t err_log)
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{
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const struct btf_header *hdr = btf->hdr;
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const char *start = btf->nohdr_data + hdr->str_off;
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const char *end = start + btf->hdr->str_len;
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if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_NAME_OFFSET ||
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start[0] || end[-1]) {
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elog("Invalid BTF string section\n");
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return -EINVAL;
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}
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btf->strings = start;
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return 0;
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}
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static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
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{
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struct btf_header *hdr = btf->hdr;
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void *nohdr_data = btf->nohdr_data;
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void *next_type = nohdr_data + hdr->type_off;
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void *end_type = nohdr_data + hdr->str_off;
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while (next_type < end_type) {
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struct btf_type *t = next_type;
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uint16_t vlen = BTF_INFO_VLEN(t->info);
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int err;
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next_type += sizeof(*t);
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switch (BTF_INFO_KIND(t->info)) {
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case BTF_KIND_INT:
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next_type += sizeof(int);
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break;
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case BTF_KIND_ARRAY:
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next_type += sizeof(struct btf_array);
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break;
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case BTF_KIND_STRUCT:
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case BTF_KIND_UNION:
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next_type += vlen * sizeof(struct btf_member);
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break;
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case BTF_KIND_ENUM:
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next_type += vlen * sizeof(struct btf_enum);
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break;
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case BTF_KIND_TYPEDEF:
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case BTF_KIND_PTR:
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case BTF_KIND_FWD:
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case BTF_KIND_VOLATILE:
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case BTF_KIND_CONST:
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case BTF_KIND_RESTRICT:
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break;
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default:
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elog("Unsupported BTF_KIND:%u\n",
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BTF_INFO_KIND(t->info));
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return -EINVAL;
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}
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err = btf_add_type(btf, t);
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if (err)
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return err;
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}
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return 0;
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}
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static const struct btf_type *btf_type_by_id(const struct btf *btf,
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uint32_t type_id)
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{
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if (type_id > btf->nr_types)
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return NULL;
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return btf->types[type_id];
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}
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static bool btf_type_is_void(const struct btf_type *t)
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{
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return t == &btf_void || BTF_INFO_KIND(t->info) == BTF_KIND_FWD;
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}
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static bool btf_type_is_void_or_null(const struct btf_type *t)
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{
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return !t || btf_type_is_void(t);
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}
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static int64_t btf_type_size(const struct btf_type *t)
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{
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switch (BTF_INFO_KIND(t->info)) {
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case BTF_KIND_INT:
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case BTF_KIND_STRUCT:
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case BTF_KIND_UNION:
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case BTF_KIND_ENUM:
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return t->size;
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case BTF_KIND_PTR:
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return sizeof(void *);
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default:
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return -EINVAL;
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}
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}
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#define MAX_RESOLVE_DEPTH 32
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int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id)
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{
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const struct btf_array *array;
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const struct btf_type *t;
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uint32_t nelems = 1;
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int64_t size = -1;
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int i;
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t = btf_type_by_id(btf, type_id);
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for (i = 0; i < MAX_RESOLVE_DEPTH && !btf_type_is_void_or_null(t);
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i++) {
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size = btf_type_size(t);
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if (size >= 0)
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break;
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switch (BTF_INFO_KIND(t->info)) {
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case BTF_KIND_TYPEDEF:
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case BTF_KIND_VOLATILE:
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case BTF_KIND_CONST:
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case BTF_KIND_RESTRICT:
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type_id = t->type;
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break;
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case BTF_KIND_ARRAY:
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array = (const struct btf_array *)(t + 1);
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if (nelems && array->nelems > UINT32_MAX / nelems)
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return -E2BIG;
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nelems *= array->nelems;
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type_id = array->type;
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break;
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default:
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return -EINVAL;
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}
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t = btf_type_by_id(btf, type_id);
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}
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if (size < 0)
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return -EINVAL;
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if (nelems && size > UINT32_MAX / nelems)
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return -E2BIG;
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return nelems * size;
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}
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int32_t btf__find_by_name(const struct btf *btf, const char *type_name)
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{
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uint32_t i;
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if (!strcmp(type_name, "void"))
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return 0;
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for (i = 1; i <= btf->nr_types; i++) {
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const struct btf_type *t = btf->types[i];
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const char *name = btf_name_by_offset(btf, t->name);
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|
||||
if (name && !strcmp(type_name, name))
|
||||
return i;
|
||||
}
|
||||
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
void btf__free(struct btf *btf)
|
||||
{
|
||||
if (!btf)
|
||||
return;
|
||||
|
||||
if (btf->fd != -1)
|
||||
close(btf->fd);
|
||||
|
||||
free(btf->data);
|
||||
free(btf->types);
|
||||
free(btf);
|
||||
}
|
||||
|
||||
struct btf *btf__new(uint8_t *data, uint32_t size,
|
||||
btf_print_fn_t err_log)
|
||||
{
|
||||
uint32_t log_buf_size = 0;
|
||||
char *log_buf = NULL;
|
||||
struct btf *btf;
|
||||
int err;
|
||||
|
||||
btf = calloc(1, sizeof(struct btf));
|
||||
if (!btf)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
btf->fd = -1;
|
||||
|
||||
if (err_log) {
|
||||
log_buf = malloc(BPF_LOG_BUF_SIZE);
|
||||
if (!log_buf) {
|
||||
err = -ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
*log_buf = 0;
|
||||
log_buf_size = BPF_LOG_BUF_SIZE;
|
||||
}
|
||||
|
||||
btf->data = malloc(size);
|
||||
if (!btf->data) {
|
||||
err = -ENOMEM;
|
||||
goto done;
|
||||
}
|
||||
|
||||
memcpy(btf->data, data, size);
|
||||
btf->data_size = size;
|
||||
|
||||
btf->fd = bpf_load_btf(btf->data, btf->data_size,
|
||||
log_buf, log_buf_size, false);
|
||||
|
||||
if (btf->fd == -1) {
|
||||
err = -errno;
|
||||
elog("Error loading BTF: %s(%d)\n", strerror(errno), errno);
|
||||
if (log_buf && *log_buf)
|
||||
elog("%s\n", log_buf);
|
||||
goto done;
|
||||
}
|
||||
|
||||
err = btf_parse_hdr(btf, err_log);
|
||||
if (err)
|
||||
goto done;
|
||||
|
||||
err = btf_parse_str_sec(btf, err_log);
|
||||
if (err)
|
||||
goto done;
|
||||
|
||||
err = btf_parse_type_sec(btf, err_log);
|
||||
|
||||
done:
|
||||
free(log_buf);
|
||||
|
||||
if (err) {
|
||||
btf__free(btf);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
return btf;
|
||||
}
|
||||
|
||||
int btf__fd(const struct btf *btf)
|
||||
{
|
||||
return btf->fd;
|
||||
}
|
||||
22
tools/lib/bpf/btf.h
Normal file
22
tools/lib/bpf/btf.h
Normal file
|
|
@ -0,0 +1,22 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/* Copyright (c) 2018 Facebook */
|
||||
|
||||
#ifndef __BPF_BTF_H
|
||||
#define __BPF_BTF_H
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
#define BTF_ELF_SEC ".BTF"
|
||||
|
||||
struct btf;
|
||||
|
||||
typedef int (*btf_print_fn_t)(const char *, ...)
|
||||
__attribute__((format(printf, 1, 2)));
|
||||
|
||||
void btf__free(struct btf *btf);
|
||||
struct btf *btf__new(uint8_t *data, uint32_t size, btf_print_fn_t err_log);
|
||||
int32_t btf__find_by_name(const struct btf *btf, const char *type_name);
|
||||
int64_t btf__resolve_size(const struct btf *btf, uint32_t type_id);
|
||||
int btf__fd(const struct btf *btf);
|
||||
|
||||
#endif
|
||||
|
|
@ -45,6 +45,7 @@
|
|||
|
||||
#include "libbpf.h"
|
||||
#include "bpf.h"
|
||||
#include "btf.h"
|
||||
|
||||
#ifndef EM_BPF
|
||||
#define EM_BPF 247
|
||||
|
|
@ -212,6 +213,8 @@ struct bpf_map {
|
|||
char *name;
|
||||
size_t offset;
|
||||
struct bpf_map_def def;
|
||||
uint32_t btf_key_id;
|
||||
uint32_t btf_value_id;
|
||||
void *priv;
|
||||
bpf_map_clear_priv_t clear_priv;
|
||||
};
|
||||
|
|
@ -256,6 +259,8 @@ struct bpf_object {
|
|||
*/
|
||||
struct list_head list;
|
||||
|
||||
struct btf *btf;
|
||||
|
||||
void *priv;
|
||||
bpf_object_clear_priv_t clear_priv;
|
||||
|
||||
|
|
@ -819,7 +824,15 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
|
|||
data->d_size);
|
||||
else if (strcmp(name, "maps") == 0)
|
||||
obj->efile.maps_shndx = idx;
|
||||
else if (sh.sh_type == SHT_SYMTAB) {
|
||||
else if (strcmp(name, BTF_ELF_SEC) == 0) {
|
||||
obj->btf = btf__new(data->d_buf, data->d_size,
|
||||
__pr_debug);
|
||||
if (IS_ERR(obj->btf)) {
|
||||
pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
|
||||
BTF_ELF_SEC, PTR_ERR(obj->btf));
|
||||
obj->btf = NULL;
|
||||
}
|
||||
} else if (sh.sh_type == SHT_SYMTAB) {
|
||||
if (obj->efile.symbols) {
|
||||
pr_warning("bpf: multiple SYMTAB in %s\n",
|
||||
obj->path);
|
||||
|
|
@ -996,33 +1009,126 @@ bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
|
||||
{
|
||||
struct bpf_map_def *def = &map->def;
|
||||
const size_t max_name = 256;
|
||||
int64_t key_size, value_size;
|
||||
int32_t key_id, value_id;
|
||||
char name[max_name];
|
||||
|
||||
/* Find key type by name from BTF */
|
||||
if (snprintf(name, max_name, "%s_key", map->name) == max_name) {
|
||||
pr_warning("map:%s length of BTF key_type:%s_key is too long\n",
|
||||
map->name, map->name);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
key_id = btf__find_by_name(btf, name);
|
||||
if (key_id < 0) {
|
||||
pr_debug("map:%s key_type:%s cannot be found in BTF\n",
|
||||
map->name, name);
|
||||
return key_id;
|
||||
}
|
||||
|
||||
key_size = btf__resolve_size(btf, key_id);
|
||||
if (key_size < 0) {
|
||||
pr_warning("map:%s key_type:%s cannot get the BTF type_size\n",
|
||||
map->name, name);
|
||||
return key_size;
|
||||
}
|
||||
|
||||
if (def->key_size != key_size) {
|
||||
pr_warning("map:%s key_type:%s has BTF type_size:%ld != key_size:%u\n",
|
||||
map->name, name, key_size, def->key_size);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Find value type from BTF */
|
||||
if (snprintf(name, max_name, "%s_value", map->name) == max_name) {
|
||||
pr_warning("map:%s length of BTF value_type:%s_value is too long\n",
|
||||
map->name, map->name);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
value_id = btf__find_by_name(btf, name);
|
||||
if (value_id < 0) {
|
||||
pr_debug("map:%s value_type:%s cannot be found in BTF\n",
|
||||
map->name, name);
|
||||
return value_id;
|
||||
}
|
||||
|
||||
value_size = btf__resolve_size(btf, value_id);
|
||||
if (value_size < 0) {
|
||||
pr_warning("map:%s value_type:%s cannot get the BTF type_size\n",
|
||||
map->name, name);
|
||||
return value_size;
|
||||
}
|
||||
|
||||
if (def->value_size != value_size) {
|
||||
pr_warning("map:%s value_type:%s has BTF type_size:%ld != value_size:%u\n",
|
||||
map->name, name, value_size, def->value_size);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
map->btf_key_id = key_id;
|
||||
map->btf_value_id = value_id;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
bpf_object__create_maps(struct bpf_object *obj)
|
||||
{
|
||||
struct bpf_create_map_attr create_attr = {};
|
||||
unsigned int i;
|
||||
int err;
|
||||
|
||||
for (i = 0; i < obj->nr_maps; i++) {
|
||||
struct bpf_map_def *def = &obj->maps[i].def;
|
||||
int *pfd = &obj->maps[i].fd;
|
||||
struct bpf_map *map = &obj->maps[i];
|
||||
struct bpf_map_def *def = &map->def;
|
||||
int *pfd = &map->fd;
|
||||
|
||||
create_attr.name = map->name;
|
||||
create_attr.map_type = def->type;
|
||||
create_attr.map_flags = def->map_flags;
|
||||
create_attr.key_size = def->key_size;
|
||||
create_attr.value_size = def->value_size;
|
||||
create_attr.max_entries = def->max_entries;
|
||||
create_attr.btf_fd = 0;
|
||||
create_attr.btf_key_id = 0;
|
||||
create_attr.btf_value_id = 0;
|
||||
|
||||
if (obj->btf && !bpf_map_find_btf_info(map, obj->btf)) {
|
||||
create_attr.btf_fd = btf__fd(obj->btf);
|
||||
create_attr.btf_key_id = map->btf_key_id;
|
||||
create_attr.btf_value_id = map->btf_value_id;
|
||||
}
|
||||
|
||||
*pfd = bpf_create_map_xattr(&create_attr);
|
||||
if (*pfd < 0 && create_attr.btf_key_id) {
|
||||
pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n",
|
||||
map->name, strerror(errno), errno);
|
||||
create_attr.btf_fd = 0;
|
||||
create_attr.btf_key_id = 0;
|
||||
create_attr.btf_value_id = 0;
|
||||
map->btf_key_id = 0;
|
||||
map->btf_value_id = 0;
|
||||
*pfd = bpf_create_map_xattr(&create_attr);
|
||||
}
|
||||
|
||||
*pfd = bpf_create_map_name(def->type,
|
||||
obj->maps[i].name,
|
||||
def->key_size,
|
||||
def->value_size,
|
||||
def->max_entries,
|
||||
def->map_flags);
|
||||
if (*pfd < 0) {
|
||||
size_t j;
|
||||
int err = *pfd;
|
||||
|
||||
err = *pfd;
|
||||
pr_warning("failed to create map (name: '%s'): %s\n",
|
||||
obj->maps[i].name,
|
||||
map->name,
|
||||
strerror(errno));
|
||||
for (j = 0; j < i; j++)
|
||||
zclose(obj->maps[j].fd);
|
||||
return err;
|
||||
}
|
||||
pr_debug("create map %s: fd=%d\n", obj->maps[i].name, *pfd);
|
||||
pr_debug("create map %s: fd=%d\n", map->name, *pfd);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
|
@ -1641,6 +1747,7 @@ void bpf_object__close(struct bpf_object *obj)
|
|||
|
||||
bpf_object__elf_finish(obj);
|
||||
bpf_object__unload(obj);
|
||||
btf__free(obj->btf);
|
||||
|
||||
for (i = 0; i < obj->nr_maps; i++) {
|
||||
zfree(&obj->maps[i].name);
|
||||
|
|
@ -1692,6 +1799,11 @@ unsigned int bpf_object__kversion(struct bpf_object *obj)
|
|||
return obj ? obj->kern_version : 0;
|
||||
}
|
||||
|
||||
int bpf_object__btf_fd(const struct bpf_object *obj)
|
||||
{
|
||||
return obj->btf ? btf__fd(obj->btf) : -1;
|
||||
}
|
||||
|
||||
int bpf_object__set_priv(struct bpf_object *obj, void *priv,
|
||||
bpf_object_clear_priv_t clear_priv)
|
||||
{
|
||||
|
|
@ -1937,6 +2049,16 @@ const char *bpf_map__name(struct bpf_map *map)
|
|||
return map ? map->name : NULL;
|
||||
}
|
||||
|
||||
uint32_t bpf_map__btf_key_id(const struct bpf_map *map)
|
||||
{
|
||||
return map ? map->btf_key_id : 0;
|
||||
}
|
||||
|
||||
uint32_t bpf_map__btf_value_id(const struct bpf_map *map)
|
||||
{
|
||||
return map ? map->btf_value_id : 0;
|
||||
}
|
||||
|
||||
int bpf_map__set_priv(struct bpf_map *map, void *priv,
|
||||
bpf_map_clear_priv_t clear_priv)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -78,6 +78,7 @@ int bpf_object__load(struct bpf_object *obj);
|
|||
int bpf_object__unload(struct bpf_object *obj);
|
||||
const char *bpf_object__name(struct bpf_object *obj);
|
||||
unsigned int bpf_object__kversion(struct bpf_object *obj);
|
||||
int bpf_object__btf_fd(const struct bpf_object *obj);
|
||||
|
||||
struct bpf_object *bpf_object__next(struct bpf_object *prev);
|
||||
#define bpf_object__for_each_safe(pos, tmp) \
|
||||
|
|
@ -241,6 +242,8 @@ bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
|
|||
int bpf_map__fd(struct bpf_map *map);
|
||||
const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
|
||||
const char *bpf_map__name(struct bpf_map *map);
|
||||
uint32_t bpf_map__btf_key_id(const struct bpf_map *map);
|
||||
uint32_t bpf_map__btf_value_id(const struct bpf_map *map);
|
||||
|
||||
typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
|
||||
int bpf_map__set_priv(struct bpf_map *map, void *priv,
|
||||
|
|
|
|||
Loading…
Reference in a new issue