RDMA/nldev: helper functions to add driver attributes

These help rdma drivers to fill out the driver entries.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/nldev.c

@@ -109,6 +109,72 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_ATTR_DRIVER_U64]		= { .type = NLA_U64 },
 };
 
+static int put_driver_name_print_type(struct sk_buff *msg, const char *name,
+				      enum rdma_nldev_print_type print_type)
+{
+	if (nla_put_string(msg, RDMA_NLDEV_ATTR_DRIVER_STRING, name))
+		return -EMSGSIZE;
+	if (print_type != RDMA_NLDEV_PRINT_TYPE_UNSPEC &&
+	    nla_put_u8(msg, RDMA_NLDEV_ATTR_DRIVER_PRINT_TYPE, print_type))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int _rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name,
+				   enum rdma_nldev_print_type print_type,
+				   u32 value)
+{
+	if (put_driver_name_print_type(msg, name, print_type))
+		return -EMSGSIZE;
+	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_DRIVER_U32, value))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int _rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name,
+				   enum rdma_nldev_print_type print_type,
+				   u64 value)
+{
+	if (put_driver_name_print_type(msg, name, print_type))
+		return -EMSGSIZE;
+	if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_DRIVER_U64, value,
+			      RDMA_NLDEV_ATTR_PAD))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value)
+{
+	return _rdma_nl_put_driver_u32(msg, name, RDMA_NLDEV_PRINT_TYPE_UNSPEC,
+				       value);
+}
+EXPORT_SYMBOL(rdma_nl_put_driver_u32);
+
+int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
+			       u32 value)
+{
+	return _rdma_nl_put_driver_u32(msg, name, RDMA_NLDEV_PRINT_TYPE_HEX,
+				       value);
+}
+EXPORT_SYMBOL(rdma_nl_put_driver_u32_hex);
+
+int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value)
+{
+	return _rdma_nl_put_driver_u64(msg, name, RDMA_NLDEV_PRINT_TYPE_UNSPEC,
+				       value);
+}
+EXPORT_SYMBOL(rdma_nl_put_driver_u64);
+
+int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name, u64 value)
+{
+	return _rdma_nl_put_driver_u64(msg, name, RDMA_NLDEV_PRINT_TYPE_HEX,
+				       value);
+}
+EXPORT_SYMBOL(rdma_nl_put_driver_u64_hex);
+
 static int fill_nldev_handle(struct sk_buff *msg, struct ib_device *device)
 {
 	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_DEV_INDEX, device->index))

include/rdma/restrack.h

@@ -12,6 +12,7 @@
 #include <linux/kref.h>
 #include <linux/completion.h>
 #include <linux/sched/task.h>
+#include <uapi/rdma/rdma_netlink.h>
 
 /**
  * enum rdma_restrack_type - HW objects to track
@@ -183,4 +184,14 @@ static inline void rdma_restrack_set_task(struct rdma_restrack_entry *res,
 	res->task = task;
 }
 
+/*
+ * Helper functions for rdma drivers when filling out
+ * nldev driver attributes.
+ */
+int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
+int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
+			       u32 value);
+int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
+int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
+			       u64 value);
 #endif /* _RDMA_RESTRACK_H_ */