netdev - [PATCH bpf-next v3 6/8] bpftool: support metadata internal map in gen skeleton

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Message-Id: <20200828193603.335512-7-sdf@google.com>
Date:   Fri, 28 Aug 2020 12:36:01 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        YiFei Zhu <zhuyifei@...gle.com>,
        YiFei Zhu <zhuyifei1999@...il.com>,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v3 6/8] bpftool: support metadata internal map in gen skeleton

From: YiFei Zhu <zhuyifei@...gle.com>

The treatment of this section .metadata is exactly like .rodata,
the type modifiers are stripped. The resulting skeleton looks like:

  struct skel_with_metadata {
  	struct bpf_object_skeleton *skeleton;
  	struct bpf_object *obj;
  	struct {
  		struct bpf_map *metadata;
  	} maps;
  	[...]
  	struct skel_with_metadata__metadata {
  		char metadata_a[4];
  		int metadata_b;
  	} *metadata;
  };

Cc: YiFei Zhu <zhuyifei1999@...il.com>
Signed-off-by: YiFei Zhu <zhuyifei@...gle.com>
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 tools/bpf/bpftool/gen.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index 4033c46d83e7..9c316ea23ca1 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -82,6 +82,8 @@ static const char *get_map_ident(const struct bpf_map *map)
 		return "bss";
 	else if (str_has_suffix(name, ".kconfig"))
 		return "kconfig";
+	else if (str_has_suffix(name, ".metadata"))
+		return "metadata";
 	else
 		return NULL;
 }
@@ -113,6 +115,9 @@ static int codegen_datasec_def(struct bpf_object *obj,
 		strip_mods = true;
 	} else if (strcmp(sec_name, ".kconfig") == 0) {
 		sec_ident = "kconfig";
+	} else if (strcmp(sec_name, ".metadata") == 0) {
+		sec_ident = "metadata";
+		strip_mods = true;
 	} else {
 		return 0;
 	}
-- 
2.28.0.402.g5ffc5be6b7-goog