RDMA/nldev: Add support to dump device type and parent device if exists

If a device has a specific type or a parent device, dump them as well.

Example:
$ rdma dev show smi1
3: smi1: node_type ca fw 20.38.1002 node_guid 9803:9b03:009f:d5ef sys_image_guid 9803:9b03:009f:d5ee type smi parent ibp8s0f1

Signed-off-by: Mark Zhang <[email protected]>
Link: https://lore.kernel.org/r/4c022e3e34b5de1254a3b367d502a362cdd0c53a.1718553901.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <[email protected]>

Author: MarkZhang81

drivers/infiniband/core/nldev.c

@@ -168,6 +168,7 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
 	[RDMA_NLDEV_SYS_ATTR_PRIVILEGED_QKEY_MODE] = { .type = NLA_U8 },
 	[RDMA_NLDEV_ATTR_DRIVER_DETAILS]	= { .type = NLA_U8 },
 	[RDMA_NLDEV_ATTR_DEV_TYPE]		= { .type = NLA_U8 },
+	[RDMA_NLDEV_ATTR_PARENT_NAME]		= { .type = NLA_NUL_STRING },
 };
 
 static int put_driver_name_print_type(struct sk_buff *msg, const char *name,
@@ -302,6 +303,15 @@ static int fill_dev_info(struct sk_buff *msg, struct ib_device *device)
 	if (nla_put_u8(msg, RDMA_NLDEV_ATTR_DEV_DIM, device->use_cq_dim))
 		return -EMSGSIZE;
 
+	if (device->type &&
+	    nla_put_u8(msg, RDMA_NLDEV_ATTR_DEV_TYPE, device->type))
+		return -EMSGSIZE;
+
+	if (device->parent &&
+	    nla_put_string(msg, RDMA_NLDEV_ATTR_PARENT_NAME,
+			   dev_name(&device->parent->dev)))
+		return -EMSGSIZE;
+
 	/*
 	 * Link type is determined on first port and mlx4 device
 	 * which can potentially have two different link type for the same

include/uapi/rdma/rdma_netlink.h

@@ -570,6 +570,8 @@ enum rdma_nldev_attr {
 
 	RDMA_NLDEV_ATTR_DEV_TYPE,		/* u8 */
 
+	RDMA_NLDEV_ATTR_PARENT_NAME,		/* string */
+
 	/*
 	 * Always the end
 	 */