IB/core: Change completion channel to use the reworked objects schema

This patch adds the standard fd based type - completion_channel.
The completion_channel is now prefixed with ib_uobject, similarly
to the rest of the uobjects.
This requires a few changes:
(1) We define a new completion channel fd based object type.
(2) completion_event and async_event are now two different types.
    This means they use different fops.
(3) We release the completion_channel exactly as we release other
    idr based objects.
(4) Since ib_uobjects are already kref-ed, we only add the kref to the
    async event.

A fd object requires filling out several parameters. Its op pointer
should point to uverbs_fd_ops and its size should be at least the
size if ib_uobject. We use a macro to make the type declaration
easier.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/rdma/uverbs_types.h b/include/rdma/uverbs_types.h
index 58674290fab0..a37692167a45 100644
--- a/include/rdma/uverbs_types.h
+++ b/include/rdma/uverbs_types.h
@@ -146,9 +146,18 @@ struct uverbs_obj_fd_type {
 };
 
 extern const struct uverbs_obj_type_class uverbs_idr_class;
+extern const struct uverbs_obj_type_class uverbs_fd_class;
 
 #define UVERBS_BUILD_BUG_ON(cond) (sizeof(char[1 - 2 * !!(cond)]) -	\
 				   sizeof(char))
+#define UVERBS_TYPE_ALLOC_FD(_size, _order)				 \
+	{								 \
+		.destroy_order = _order,				 \
+		.type_class = &uverbs_fd_class,				 \
+		.obj_size = (_size) +					 \
+			  UVERBS_BUILD_BUG_ON((_size) <			 \
+					      sizeof(struct ib_uobject_file)),\
+	}
 #define UVERBS_TYPE_ALLOC_IDR_SZ(_size, _order)				\
 	{								\
 		.destroy_order = _order,				\