tools lib bpf: Add private field for bpf_object

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

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-3-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 96a2b2ff1212..866d5cdeffc7 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)
 {