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libbpf: Wire through log_true_size for bpf_btf_load() API

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Similar to what we did for bpf_prog_load() in previous patch, wire
returning of log_true_size value from kernel back to the user through
OPTS out field.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230406234205.323208-17-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2023-04-06 16:42:02 -07:00 committed by Daniel Borkmann
parent 94e55c0fda
commit 097d8002b7
2 changed files with 13 additions and 4 deletions
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6
tools/lib/bpf/bpf.c
View file

@ -1083,9 +1083,9 @@ int bpf_raw_tracepoint_open(const char *name, int prog_fd)
return libbpf_err_errno(fd);
}
int bpf_btf_load(const void *btf_data, size_t btf_size, const struct bpf_btf_load_opts *opts)
int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, btf_log_level);
const size_t attr_sz = offsetofend(union bpf_attr, btf_log_true_size);
union bpf_attr attr;
char *log_buf;
size_t log_size;
@ -1128,6 +1128,8 @@ int bpf_btf_load(const void *btf_data, size_t btf_size, const struct bpf_btf_loa
attr.btf_log_level = 1;
fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz);
}
OPTS_SET(opts, log_true_size, attr.btf_log_true_size);
return libbpf_err_errno(fd);
}

11
tools/lib/bpf/bpf.h
View file

@ -124,11 +124,18 @@ struct bpf_btf_load_opts {
char *log_buf;
__u32 log_level;
__u32 log_size;
/* output: actual total log contents size (including termintaing zero).
* It could be both larger than original log_size (if log was
* truncated), or smaller (if log buffer wasn't filled completely).
* If kernel doesn't support this feature, log_size is left unchanged.
*/
__u32 log_true_size;
size_t :0;
};
#define bpf_btf_load_opts__last_field log_size
#define bpf_btf_load_opts__last_field log_true_size
LIBBPF_API int bpf_btf_load(const void *btf_data, size_t btf_size,
const struct bpf_btf_load_opts *opts);
struct bpf_btf_load_opts *opts);
LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value,
__u64 flags);