IB/uverbs: Add ib_ucontext to uverbs_attr_bundle sent from ioctl and cmd flows

Add ib_ucontext to the uverbs_attr_bundle sent down the iocl and cmd flows
as soon as the flow has ib_uobject.

In addition, remove rdma_get_ucontext helper function that is only used by
ib_umem_get.

Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/rdma_core.c

@@ -438,6 +438,38 @@ free:
 	uverbs_uobject_put(uobj);
 	return ERR_PTR(ret);
 }
+struct ib_uobject *_uobj_get_read(enum uverbs_default_objects type,
+				  u32 object_id,
+				  struct uverbs_attr_bundle *attrs)
+{
+	struct ib_uobject *uobj;
+
+	uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile,
+				       object_id, UVERBS_LOOKUP_READ);
+	if (IS_ERR(uobj))
+		return uobj;
+
+	attrs->context = uobj->context;
+
+	return uobj;
+}
+
+struct ib_uobject *_uobj_get_write(enum uverbs_default_objects type,
+				   u32 object_id,
+				   struct uverbs_attr_bundle *attrs)
+{
+	struct ib_uobject *uobj;
+
+	uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile,
+				       object_id, UVERBS_LOOKUP_WRITE);
+
+	if (IS_ERR(uobj))
+		return uobj;
+
+	attrs->context = uobj->context;
+
+	return uobj;
+}
 
 static struct ib_uobject *
 alloc_begin_idr_uobject(const struct uverbs_api_object *obj,

drivers/infiniband/core/umem.c

@@ -96,9 +96,13 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
 	struct scatterlist *sg, *sg_list_start;
 	unsigned int gup_flags = FOLL_WRITE;
 
-	context = rdma_get_ucontext(udata);
-	if (IS_ERR(context))
-		return ERR_CAST(context);
+	if (!udata)
+		return ERR_PTR(-EIO);
+
+	context = container_of(udata, struct uverbs_attr_bundle, driver_udata)
+			  ->context;
+	if (!context)
+		return ERR_PTR(-EIO);
 
 	if (dmasync)
 		dma_attrs |= DMA_ATTR_WRITE_BARRIER;

drivers/infiniband/core/uverbs_cmd.c

@@ -2634,7 +2634,7 @@ void flow_resources_add(struct ib_uflow_resources *uflow_res,
 }
 EXPORT_SYMBOL(flow_resources_add);
 
-static int kern_spec_to_ib_spec_action(const struct uverbs_attr_bundle *attrs,
+static int kern_spec_to_ib_spec_action(struct uverbs_attr_bundle *attrs,
 				       struct ib_uverbs_flow_spec *kern_spec,
 				       union ib_flow_spec *ib_spec,
 				       struct ib_uflow_resources *uflow_res)

drivers/infiniband/core/uverbs_ioctl.c

@@ -213,6 +213,7 @@ static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
 			ret = PTR_ERR(attr->uobjects[i]);
 			break;
 		}
+		pbundle->bundle.context = attr->uobjects[i]->context;
 	}
 
 	attr->len = i;
@@ -330,6 +331,7 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
 					uattr->data_s64);
 		if (IS_ERR(o_attr->uobject))
 			return PTR_ERR(o_attr->uobject);
+		pbundle->bundle.context = o_attr->uobject->context;
 		__set_bit(attr_bkey, pbundle->uobj_finalize);
 
 		if (spec->u.obj.access == UVERBS_ACCESS_NEW) {
@@ -592,6 +594,7 @@ static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
 	pbundle->method_elm = method_elm;
 	pbundle->method_key = attrs_iter.index;
 	pbundle->bundle.ufile = ufile;
+	pbundle->bundle.context = NULL; /* only valid if bundle has uobject */
 	pbundle->radix = &uapi->radix;
 	pbundle->radix_slots = slot;
 	pbundle->radix_slots_len = radix_tree_chunk_size(&attrs_iter);

drivers/infiniband/core/uverbs_main.c

@@ -101,30 +101,6 @@ struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
 }
 EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
 
-/* rdma_get_ucontext - Return the ucontext from a udata
- * @udata: The udata to get the context from
- *
- * This can only be called from within a uapi method that was passed ib_udata
- * as a parameter. It returns the ucontext associated with the udata, or ERR_PTR
- * if the udata is NULL or the ucontext has been disassociated.
- */
-struct ib_ucontext *rdma_get_ucontext(struct ib_udata *udata)
-{
-	if (!udata)
-		return ERR_PTR(-EIO);
-
-	/*
-	 * FIXME: Really all cases that get here with a udata will have
-	 * already called ib_uverbs_get_ucontext_file, or located a uobject
-	 * that points to a ucontext. We could store that result in the udata
-	 * so this function can't fail.
-	 */
-	return ib_uverbs_get_ucontext_file(
-		container_of(udata, struct uverbs_attr_bundle, driver_udata)
-			->ufile);
-}
-EXPORT_SYMBOL(rdma_get_ucontext);
-
 int uverbs_dealloc_mw(struct ib_mw *mw)
 {
 	struct ib_pd *pd = mw->pd;
@@ -719,6 +695,7 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 
 	memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
 	bundle.ufile = file;
+	bundle.context = NULL; /* only valid if bundle has uobject */
 	if (!method_elm->is_ex) {
 		size_t in_len = hdr.in_words * 4 - sizeof(hdr);
 		size_t out_len = hdr.out_words * 4;

include/rdma/ib_verbs.h

@@ -4247,8 +4247,6 @@ void rdma_roce_rescan_device(struct ib_device *ibdev);
 
 struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile);
 
-struct ib_ucontext *rdma_get_ucontext(struct ib_udata *udata);
-
 int uverbs_destroy_def_handler(struct uverbs_attr_bundle *attrs);
 
 struct net_device *rdma_alloc_netdev(struct ib_device *device, u8 port_num,

include/rdma/uverbs_ioctl.h

@@ -652,6 +652,7 @@ struct uverbs_attr_bundle {
 	struct ib_udata driver_udata;
 	struct ib_udata ucore;
 	struct ib_uverbs_file *ufile;
+	struct ib_ucontext *context;
 	DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
 	struct uverbs_attr attrs[];
 };

include/rdma/uverbs_std_types.h

@@ -48,9 +48,12 @@
 #define uobj_get_type(_attrs, _object)                                         \
 	uapi_get_object((_attrs)->ufile->device->uapi, _object)
 
+struct ib_uobject *_uobj_get_read(enum uverbs_default_objects type,
+				  u32 object_id,
+				  struct uverbs_attr_bundle *attrs);
+
 #define uobj_get_read(_type, _id, _attrs)                                      \
-	rdma_lookup_get_uobject(uobj_get_type(_attrs, _type), (_attrs)->ufile, \
-				_uobj_check_id(_id), UVERBS_LOOKUP_READ)
+	_uobj_get_read(_type, _uobj_check_id(_id), _attrs)
 
 #define ufd_get_read(_type, _fdnum, _attrs)                                    \
 	rdma_lookup_get_uobject(uobj_get_type(_attrs, _type), (_attrs)->ufile, \
@@ -67,9 +70,12 @@ static inline void *_uobj_get_obj_read(struct ib_uobject *uobj)
 	((struct ib_##_object *)_uobj_get_obj_read(                            \
 		uobj_get_read(_type, _id, _attrs)))
 
+struct ib_uobject *_uobj_get_write(enum uverbs_default_objects type,
+				   u32 object_id,
+				   struct uverbs_attr_bundle *attrs);
+
 #define uobj_get_write(_type, _id, _attrs)                                     \
-	rdma_lookup_get_uobject(uobj_get_type(_attrs, _type), (_attrs)->ufile, \
-				_uobj_check_id(_id), UVERBS_LOOKUP_WRITE)
+	_uobj_get_write(_type, _uobj_check_id(_id), _attrs)
 
 int __uobj_perform_destroy(const struct uverbs_api_object *obj, u32 id,
 			   const struct uverbs_attr_bundle *attrs);
@@ -123,8 +129,10 @@ __uobj_alloc(const struct uverbs_api_object *obj,
 {
 	struct ib_uobject *uobj = rdma_alloc_begin_uobject(obj, attrs->ufile);
 
-	if (!IS_ERR(uobj))
+	if (!IS_ERR(uobj)) {
 		*ib_dev = uobj->context->device;
+		attrs->context = uobj->context;
+	}
 	return uobj;
 }