[IB] uverbs: Add device-specific ABI version attribute
Add abi_version attribute to uverbs class devices to allow for
ABI versioning of device-specific interfaces.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index e7058fb..c84cc28 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -598,6 +598,15 @@
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
+static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
+{
+ struct ib_uverbs_device *dev =
+ container_of(class_dev, struct ib_uverbs_device, class_dev);
+
+ return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
+}
+static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
+
static void ib_uverbs_release_class_dev(struct class_device *class_dev)
{
struct ib_uverbs_device *dev =
@@ -662,6 +671,8 @@
if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
goto err_class;
+ if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_abi_version))
+ goto err_class;
ib_set_client_data(device, &uverbs_client, uverbs_dev);
