[PATCH 06/34] tools lib bpf: Add private field for bpf_object

[Wang Nan]

Like other classes defined in libbpf.h (like map and program), allow
'object' class has its own private data.

Signed-off-by: Wang Nan <wangn...@huawei.com>
Cc: Alexei Starovoitov <a...@fb.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Li Zefan <lize...@huawei.com>
---
 tools/lib/bpf/libbpf.c | 23 +++++++++++++++++++++++
 tools/lib/bpf/libbpf.h |  5 +++++
 2 files changed, 28 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 96a2b2f..866d5cd 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -229,6 +229,10 @@ struct bpf_object {
         * all objects.
         */
        struct list_head list;
+
+       void *priv;
+       bpf_object_clear_priv_t clear_priv;
+
        char path[];
 };
 #define obj_elf_valid(o)       ((o)->efile.elf)
@@ -1229,6 +1233,9 @@ void bpf_object__close(struct bpf_object *obj)
        if (!obj)
                return;
 
+       if (obj->clear_priv)
+               obj->clear_priv(obj, obj->priv);
+
        bpf_object__elf_finish(obj);
        bpf_object__unload(obj);
 
@@ -1282,6 +1289,22 @@ unsigned int bpf_object__kversion(struct bpf_object *obj)
        return obj ? obj->kern_version : 0;
 }
 
+int bpf_object__set_priv(struct bpf_object *obj, void *priv,
+                        bpf_object_clear_priv_t clear_priv)
+{
+       if (obj->priv && obj->clear_priv)
+               obj->clear_priv(obj, obj->priv);
+
+       obj->priv = priv;
+       obj->clear_priv = clear_priv;
+       return 0;
+}
+
+void *bpf_object__priv(struct bpf_object *obj)
+{
+       return obj ? obj->priv : ERR_PTR(-EINVAL);
+}
+
 struct bpf_program *
 bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
 {
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index dd7a513..0c0b012 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -79,6 +79,11 @@ struct bpf_object *bpf_object__next(struct bpf_object *prev);
             (pos) != NULL;                             \
             (pos) = (tmp), (tmp) = bpf_object__next(tmp))
 
+typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
+int bpf_object__set_priv(struct bpf_object *obj, void *priv,
+                        bpf_object_clear_priv_t clear_priv);
+void *bpf_object__priv(struct bpf_object *prog);
+
 /* Accessors of bpf_program. */
 struct bpf_program;
 struct bpf_program *bpf_program__next(struct bpf_program *prog,
-- 
2.10.1