RDMA/uverbs: Use uverbs_attr_bundle to pass udata for ioctl()

Have the core code initialize the driver_udata if the method has a udata
description. This is done using the same create_udata the handler was
supposed to call.

This makes ioctl consistent with the write and write_ex paths.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/core/rdma_core.h

@@ -131,6 +131,7 @@ struct uverbs_api_ioctl_method {
 	u8 use_stack:1;
 	u8 driver_method:1;
 	u8 disabled:1;
+	u8 has_udata:1;
 	u8 key_bitmap_len;
 	u8 destroy_bkey;
 };

drivers/infiniband/core/uverbs_ioctl.c

@@ -435,6 +435,9 @@ static int ib_uverbs_run_method(struct bundle_priv *pbundle,
 				    pbundle->method_elm->key_bitmap_len)))
 		return -EINVAL;
 
+	if (pbundle->method_elm->has_udata)
+		create_udata(&pbundle->bundle, &pbundle->bundle.driver_udata);
+
 	if (destroy_bkey != UVERBS_API_ATTR_BKEY_LEN) {
 		struct uverbs_obj_attr *destroy_attr =
 			&pbundle->bundle.attrs[destroy_bkey].obj_attr;

drivers/infiniband/core/uverbs_std_types_cq.c

@@ -64,7 +64,6 @@ static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
 		uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE),
 		typeof(*obj), uobject);
 	struct ib_device *ib_dev = obj->uobject.context->device;
-	struct ib_udata uhw;
 	int ret;
 	u64 user_handle;
 	struct ib_cq_init_attr attr = {};
@@ -111,10 +110,8 @@ static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
 	INIT_LIST_HEAD(&obj->comp_list);
 	INIT_LIST_HEAD(&obj->async_list);
 
-	/* Temporary, only until drivers get the new uverbs_attr_bundle */
-	create_udata(attrs, &uhw);
-
-	cq = ib_dev->create_cq(ib_dev, &attr, obj->uobject.context, &uhw);
+	cq = ib_dev->create_cq(ib_dev, &attr, obj->uobject.context,
+			       &attrs->driver_udata);
 	if (IS_ERR(cq)) {
 		ret = PTR_ERR(cq);
 		goto err_event_file;

drivers/infiniband/core/uverbs_uapi.c

@@ -381,6 +381,9 @@ uapi_finalize_ioctl_method(struct uverbs_api *uapi,
 		if (elm->spec.mandatory)
 			__set_bit(attr_bkey, method_elm->attr_mandatory);
 
+		if (elm->spec.is_udata)
+			method_elm->has_udata = true;
+
 		if (type == UVERBS_ATTR_TYPE_IDR ||
 		    type == UVERBS_ATTR_TYPE_FD) {
 			u8 access = elm->spec.u.obj.access;

include/rdma/uverbs_ioctl.h

@@ -79,6 +79,8 @@ struct uverbs_attr_spec {
 	 */
 	u8 alloc_and_copy:1;
 	u8 mandatory:1;
+	/* True if this is from UVERBS_ATTR_UHW */
+	u8 is_udata:1;
 
 	union {
 		struct {
@@ -598,10 +600,12 @@ struct uapi_definition {
 #define UVERBS_ATTR_UHW()                                                      \
 	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN,                                 \
 			   UVERBS_ATTR_MIN_SIZE(0),			       \
-			   UA_OPTIONAL),				       \
+			   UA_OPTIONAL,                                        \
+			   .is_udata = 1),				       \
 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT,                               \
 			    UVERBS_ATTR_MIN_SIZE(0),			       \
-			    UA_OPTIONAL)
+			    UA_OPTIONAL,                                       \
+			    .is_udata = 1)
 
 /* =================================================
  *              Parsing infrastructure