[PATCH 09/25] IB/verbs: Prototype of HW object clone callback

[Shamir Rabinovitch <srabinov7@gmail.com>]

From: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>

Define prototype for clone callback. The clone callback is used
by the driver layer to supply the uverbs a way to clone IB HW
object driver data to rdma-core user space provider. The clone
callback is used when new IB HW object is created and every time
it is imported to some ib_ucontext. Drivers that wish to enable
share of some IB HW object (ib_pd, ib_mr, etc..) must supply valid
clone callback for that type.

Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Shamir Rabinovitch <srabinov7@gmail.com>
Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
---
 include/rdma/ib_verbs.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index d19c0394b05a..6a3be5629e55 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2213,6 +2213,18 @@ struct iw_cm_conn_param;
 
 #define DECLARE_RDMA_OBJ_SIZE(ib_struct) size_t size_##ib_struct
 
+/*
+ * Prototype for IB HW object clone callback
+ *
+ * Define prototype for clone callback. The clone callback is used
+ * by the driver layer to supply the uverbs a way to clone IB HW
+ * object driver data to rdma-core user space provider. The clone
+ * callback is used when new IB HW object is created and every time
+ * it is imported to some ib_ucontext.
+ */
+#define clone_callback(ib_type)		\
+	int (*clone_##ib_type)(struct ib_udata *udata, struct ib_type *obj)
+
 /**
  * struct ib_device_ops - InfiniBand device operations
  * This structure defines all the InfiniBand device operations, providers will
@@ -2523,6 +2535,9 @@ struct ib_device_ops {
 	 */
 	int (*counter_update_stats)(struct rdma_counter *counter);
 
+	/* Object sharing callbacks */
+	clone_callback(ib_pd);
+
 	DECLARE_RDMA_OBJ_SIZE(ib_ah);
 	DECLARE_RDMA_OBJ_SIZE(ib_cq);
 	DECLARE_RDMA_OBJ_SIZE(ib_pd);
@@ -2530,6 +2545,17 @@ struct ib_device_ops {
 	DECLARE_RDMA_OBJ_SIZE(ib_ucontext);
 };
 
+/* Implementation of trivial clone callback */
+#define trivial_clone_callback(ib_type)					\
+static inline int trivial_clone_##ib_type(struct ib_udata *udata,	\
+					  struct ib_type *obj)		\
+{									\
+	return 0;							\
+}
+
+/* Shared IB HW object support */
+trivial_clone_callback(ib_pd);
+
 struct ib_core_device {
 	/* device must be the first element in structure until,
 	 * union of ib_core_device and device exists in ib_device.
-- 
2.20.1