netdev - [PATCH iproute2] bpf: add btf func and func

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Date:   Thu, 24 Jan 2019 16:41:07 -0800
From:   Yonghong Song <yhs@...com>
To:     <stephen@...workplumber.org>, <ast@...com>, <daniel@...earbox.net>,
        <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH iproute2] 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@...com>
---
 lib/bpf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/bpf.c b/lib/bpf.c
index 5e85cfc0..762f8857 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -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);
-- 
2.17.1