RDMA/siw: Use helper function to set sys_image_guid

Use the addrconf_addr_eui48() helper function to set the sys_image_guid,
Also make sure the GUID is valid EUI-64 identifier.

Link: https://lore.kernel.org/r/20211124102336.427637-1-kamalheib1@gmail.com
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Acked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/siw/siw_verbs.c

@@ -8,6 +8,7 @@
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>
 #include <linux/xarray.h>
+#include <net/addrconf.h>
 
 #include <rdma/iw_cm.h>
 #include <rdma/ib_verbs.h>
@@ -155,7 +156,8 @@ int siw_query_device(struct ib_device *base_dev, struct ib_device_attr *attr,
 	attr->vendor_id = SIW_VENDOR_ID;
 	attr->vendor_part_id = sdev->vendor_part_id;
 
-	memcpy(&attr->sys_image_guid, sdev->netdev->dev_addr, 6);
+	addrconf_addr_eui48((u8 *)&attr->sys_image_guid,
+			    sdev->netdev->dev_addr);
 
 	return 0;
 }