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@xxxxxxxxxx>
Signed-off-by: Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxx>
Signed-off-by: Lorenzo Fontana <lorenzo.fontana@xxxxxxxxxx>
Signed-off-by: Leonardo Di Donato <leonardo.didonato@xxxxxxxxxx>
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
tools/bpf/bpftool/bash-completion/bpftool | 6 +++-
tools/bpf/bpftool/gen.c | 42 +++++++++++++++++++++--
2 files changed, 44 insertions(+), 4 deletions(-)
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index 493753a4962e..958e1fd71b5c 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -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
;;
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index 022f30490567..8e066c747691 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -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"
@@ -1118,10 +1119,45 @@ 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 },
- { "help", do_help },
+ { "object", do_object },
+ { "skeleton", do_skeleton },
+ { "min_core_btf", do_min_core_btf},
+ { "help", do_help },
{ 0 }
};
--
2.25.1
