RDMA/core: Simplify restrack interface

In the current implementation, we have one restrack root per-device and
all users are simply providing it directly. Let's simplify the interface
and have callers provide the ib_device and internally access the
restrack_root.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/device.c

@@ -287,7 +287,7 @@ struct ib_device *_ib_alloc_device(size_t size)
 	if (!device)
 		return NULL;
 
-	rdma_restrack_init(&device->res);
+	rdma_restrack_init(device);
 
 	device->dev.class = &ib_class;
 	device_initialize(&device->dev);
@@ -315,7 +315,7 @@ void ib_dealloc_device(struct ib_device *device)
 	WARN_ON(!list_empty(&device->client_data_list));
 	WARN_ON(device->reg_state != IB_DEV_UNREGISTERED &&
 		device->reg_state != IB_DEV_UNINITIALIZED);
-	rdma_restrack_clean(&device->res);
+	rdma_restrack_clean(device);
 	put_device(&device->dev);
 }
 EXPORT_SYMBOL(ib_dealloc_device);

drivers/infiniband/core/nldev.c

@@ -314,7 +314,6 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
 		[RDMA_RESTRACK_CTX] = "ctx",
 	};
 
-	struct rdma_restrack_root *res = &device->res;
 	struct nlattr *table_attr;
 	int ret, i, curr;
 
@@ -328,7 +327,8 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
 	for (i = 0; i < RDMA_RESTRACK_MAX; i++) {
 		if (!names[i])
 			continue;
-		curr = rdma_restrack_count(res, i, task_active_pid_ns(current));
+		curr = rdma_restrack_count(device, i,
+					   task_active_pid_ns(current));
 		ret = fill_res_info_entry(msg, names[i], curr);
 		if (ret)
 			goto err;

drivers/infiniband/core/restrack.c

@@ -18,8 +18,14 @@ static int fill_res_noop(struct sk_buff *msg,
 	return 0;
 }
 
-void rdma_restrack_init(struct rdma_restrack_root *res)
+/**
+ * rdma_restrack_init() - initialize resource tracking
+ * @dev:  IB device
+ */
+void rdma_restrack_init(struct ib_device *dev)
 {
+	struct rdma_restrack_root *res = &dev->res;
+
 	init_rwsem(&res->rwsem);
 	res->fill_res_entry = fill_res_noop;
 }
@@ -38,11 +44,15 @@ static const char *type2str(enum rdma_restrack_type type)
 	return names[type];
 };
 
-void rdma_restrack_clean(struct rdma_restrack_root *res)
+/**
+ * rdma_restrack_clean() - clean resource tracking
+ * @dev:  IB device
+ */
+void rdma_restrack_clean(struct ib_device *dev)
 {
+	struct rdma_restrack_root *res = &dev->res;
 	struct rdma_restrack_entry *e;
 	char buf[TASK_COMM_LEN];
-	struct ib_device *dev;
 	const char *owner;
 	int bkt;
 
@@ -72,10 +82,16 @@ void rdma_restrack_clean(struct rdma_restrack_root *res)
 	pr_err("restrack: %s", CUT_HERE);
 }
 
-int rdma_restrack_count(struct rdma_restrack_root *res,
-			enum rdma_restrack_type type,
+/**
+ * rdma_restrack_count() - the current usage of specific object
+ * @dev:  IB device
+ * @type: actual type of object to operate
+ * @ns:   PID namespace
+ */
+int rdma_restrack_count(struct ib_device *dev, enum rdma_restrack_type type,
 			struct pid_namespace *ns)
 {
+	struct rdma_restrack_root *res = &dev->res;
 	struct rdma_restrack_entry *e;
 	u32 cnt = 0;
 

include/rdma/restrack.h

@@ -49,6 +49,7 @@ enum rdma_restrack_type {
 };
 
 #define RDMA_RESTRACK_HASH_BITS	8
+struct ib_device;
 struct rdma_restrack_entry;
 
 /**
@@ -122,25 +123,9 @@ struct rdma_restrack_entry {
 	bool			user;
 };
 
-/**
- * rdma_restrack_init() - initialize resource tracking
- * @res:  resource tracking root
- */
-void rdma_restrack_init(struct rdma_restrack_root *res);
-
-/**
- * rdma_restrack_clean() - clean resource tracking
- * @res:  resource tracking root
- */
-void rdma_restrack_clean(struct rdma_restrack_root *res);
-
-/**
- * rdma_restrack_count() - the current usage of specific object
- * @res:  resource entry
- * @type: actual type of object to operate
- * @ns:   PID namespace
- */
-int rdma_restrack_count(struct rdma_restrack_root *res,
+void rdma_restrack_init(struct ib_device *dev);
+void rdma_restrack_clean(struct ib_device *dev);
+int rdma_restrack_count(struct ib_device *dev,
 			enum rdma_restrack_type type,
 			struct pid_namespace *ns);