Commit 0a9f4a20 authored by Mauricio Vásquez's avatar Mauricio Vásquez Committed by Andrii Nakryiko
Browse files

bpftool: Add gen min_core_btf command 



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: default avatarMauricio Vásquez <mauricio@kinvolk.io>
Signed-off-by: default avatarRafael David Tinoco <rafael.tinoco@aquasec.com>
Signed-off-by: default avatarLorenzo Fontana <lorenzo.fontana@elastic.co>
Signed-off-by: default avatarLeonardo Di Donato <leonardo.didonato@elastic.co>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220215225856.671072-4-mauricio@kinvolk.io
parent 8de6cae4

tools/bpf/bpftool/bash-completion/bpftool

+5 −1
Original line number Diff line number Diff line
@@ -1003,9 +1003,13 @@ _bpftool() 
                            ;;

                    esac

                    ;;

                min_core_btf)

                    _filedir

                    return 0

                    ;;

                *)

                    [[ $prev == $object ]] && \

                        COMPREPLY=( $( compgen -W 'object skeleton help' -- "$cur" ) )

                        COMPREPLY=( $( compgen -W 'object skeleton help min_core_btf' -- "$cur" ) )

                    ;;

            esac

            ;;

tools/bpf/bpftool/gen.c

+39 −3
Original line number Diff line number Diff line
@@ -1108,6 +1108,7 @@ static int do_help(int argc, char **argv) 
	fprintf(stderr,

		"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 min_core_btf INPUT OUTPUT OBJECT [OBJECT...]\n"

		"       %1$s %2$s help\n"

		"\n"

		"       " HELP_SPEC_OPTIONS " |\n"
@@ -1118,9 +1119,44 @@ static int do_help(int argc, char **argv) 
	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[] = {

	{ "object",		do_object },

	{ "skeleton",		do_skeleton },

	{ "min_core_btf",	do_min_core_btf},

	{ "help",		do_help },

	{ 0 }

};