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bpftool: Add gen min_core_btf command

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This command is implemented under the "gen" command in bpftool and the
syntax is the following:

$ bpftool gen min_core_btf INPUT OUTPUT OBJECT [OBJECT...]

INPUT is the file that contains all the BTF types for a kernel and
OUTPUT is the path of the minimize BTF file that will be created with
only the types needed by the objects.

Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
Signed-off-by: Rafael David Tinoco <rafael.tinoco@aquasec.com>
Signed-off-by: Lorenzo Fontana <lorenzo.fontana@elastic.co>
Signed-off-by: Leonardo Di Donato <leonardo.didonato@elastic.co>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220215225856.671072-4-mauricio@kinvolk.io
This commit is contained in:
Mauricio Vásquez 2022-02-15 17:58:52 -05:00 committed by Andrii Nakryiko
parent 8de6cae40b
commit 0a9f4a20c6
2 changed files with 44 additions and 4 deletions
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6
tools/bpf/bpftool/bash-completion/bpftool
View File

@ -1003,9 +1003,13 @@ _bpftool()
;; ;;
esac esac
;; ;;
min_core_btf)
_filedir
return 0
;;
*) *)
[[ $prev == $object ]] && \ [[ $prev == $object ]] && \
COMPREPLY=( $( compgen -W 'object skeleton help' -- "$cur" ) ) COMPREPLY=( $( compgen -W 'object skeleton help min_core_btf' -- "$cur" ) )
;; ;;
esac esac
;; ;;

42
tools/bpf/bpftool/gen.c
View File

@ -1108,6 +1108,7 @@ static int do_help(int argc, char **argv)
fprintf(stderr, fprintf(stderr,
"Usage: %1$s %2$s object OUTPUT_FILE INPUT_FILE [INPUT_FILE...]\n" "Usage: %1$s %2$s object OUTPUT_FILE INPUT_FILE [INPUT_FILE...]\n"
" %1$s %2$s skeleton FILE [name OBJECT_NAME]\n" " %1$s %2$s skeleton FILE [name OBJECT_NAME]\n"
" %1$s %2$s min_core_btf INPUT OUTPUT OBJECT [OBJECT...]\n"
" %1$s %2$s help\n" " %1$s %2$s help\n"
"\n" "\n"
" " HELP_SPEC_OPTIONS " |\n" " " HELP_SPEC_OPTIONS " |\n"
@ -1118,10 +1119,45 @@ static int do_help(int argc, char **argv)
return 0; return 0;
} }
/* Create minimized BTF file for a set of BPF objects */
static int minimize_btf(const char *src_btf, const char *dst_btf, const char *objspaths[])
{
return -EOPNOTSUPP;
}
static int do_min_core_btf(int argc, char **argv)
{
const char *input, *output, **objs;
int i, err;
if (!REQ_ARGS(3)) {
usage();
return -1;
}
input = GET_ARG();
output = GET_ARG();
objs = (const char **) calloc(argc + 1, sizeof(*objs));
if (!objs) {
p_err("failed to allocate array for object names");
return -ENOMEM;
}
i = 0;
while (argc)
objs[i++] = GET_ARG();
err = minimize_btf(input, output, objs);
free(objs);
return err;
}
static const struct cmd cmds[] = { static const struct cmd cmds[] = {
{ "object", do_object }, { "object", do_object },
{ "skeleton", do_skeleton }, { "skeleton", do_skeleton },
{ "help", do_help }, { "min_core_btf", do_min_core_btf},
{ "help", do_help },
{ 0 } { 0 }
}; };