selftests: mlxsw: rtnetlink: Use devlink_reload() API

The test runs "devlink reload" explicitly. Instead, it is better to use
devlink_reload() which waits for udev events to be processed. Do not sleep
after reload, as devlink_reload() blocks until all the netdevs are renamed.

Signed-off-by: Amit Cohen <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Signed-off-by: Petr Machata <[email protected]>
Link: https://patch.msgid.link/844509e3057b65277a7181a23c95b71ec95e8a56.1727706741.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Amit Cohen

tools/testing/selftests/drivers/net/mlxsw/rtnetlink.sh

@@ -186,10 +186,7 @@ bridge_vlan_flags_test()
 
 	# If we did not handle references correctly, then this should produce a
 	# trace
-	devlink dev reload "$DEVLINK_DEV"
-
-	# Allow netdevices to be re-created following the reload
-	sleep 20
+	devlink_reload
 
 	log_test "bridge vlan flags"
 }
@@ -923,12 +920,9 @@ devlink_reload_test()
 	# devlink reload can be performed without errors
 	RET=0
 
-	devlink dev reload "$DEVLINK_DEV"
-	check_err $? "devlink reload failed"
+	devlink_reload
 
 	log_test "devlink reload - last test"
-
-	sleep 20
 }
 
 trap cleanup EXIT