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bpf: add btf func and func_proto kind support 

The issue is discovered for bpf selftest test_skb_cgroup.sh.
Currently we have,
  $ ./test_skb_cgroup_id.sh
  Wait for testing link-local IP to become available ... OK
  Object has unknown BTF type: 13!
  [PASS]

In the above the BTF type 13 refers to BTF kind
BTF_KIND_FUNC_PROTO.
This patch added support of BTF_KIND_FUNC_PROTO and
BTF_KIND_FUNC during type parsing.
With this patch, I got
  $ ./test_skb_cgroup_id.sh
  Wait for testing link-local IP to become available ... OK
  [PASS]

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Yonghong Song 2019-01-24 16:41:07 -08:00 committed by Stephen Hemminger
parent 264be1d887
commit 3da6d055d9
1 changed files with 4 additions and 0 deletions
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4
lib/bpf.c
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@ -2193,12 +2193,16 @@ static int bpf_btf_prep_type_data(struct bpf_elf_ctx *ctx)
case BTF_KIND_ENUM:
type_cur += var_len * sizeof(struct btf_enum);
break;
case BTF_KIND_FUNC_PROTO:
type_cur += var_len * sizeof(struct btf_param);
break;
case BTF_KIND_TYPEDEF:
case BTF_KIND_PTR:
case BTF_KIND_FWD:
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
case BTF_KIND_FUNC:
break;
default:
fprintf(stderr, "Object has unknown BTF type: %u!\n", kind);