tools: ynl: move ethtool.py to selftest

We have converted all the samples to selftests. This script is
the last piece of random "PoC" code we still have lying around.
Let's move it to tests.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://patch.msgid.link/20260408-b4-ynl_ethtool-v2-1-7623a5e8f70b@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/tests/Makefile

@@ -36,7 +36,10 @@ TEST_GEN_FILES := \
 	rt-route \
 # end of TEST_GEN_FILES
 
-TEST_FILES := ynl_nsim_lib.sh
+TEST_FILES := \
+	ethtool.py \
+	ynl_nsim_lib.sh \
+# end of TEST_FILES
 
 CFLAGS_netdev:=$(CFLAGS_netdev) $(CFLAGS_rt-link)
 CFLAGS_ovs:=$(CFLAGS_ovs_datapath)

tools/net/ynl/tests/ethtool.py

@@ -14,7 +14,7 @@ import re
 import os
 
 # pylint: disable=no-name-in-module,wrong-import-position
-sys.path.append(pathlib.Path(__file__).resolve().parent.as_posix())
+sys.path.append(pathlib.Path(__file__).resolve().parent.parent.joinpath('pyynl').as_posix())
 # pylint: disable=import-error
 from cli import schema_dir, spec_dir
 from lib import YnlFamily

tools/net/ynl/tests/test_ynl_ethtool.sh

@@ -8,7 +8,7 @@ KSELFTEST_KTAP_HELPERS="$(dirname "$(realpath "$0")")/../../../testing/selftests
 source "$KSELFTEST_KTAP_HELPERS"
 
 # Default ynl-ethtool path for direct execution, can be overridden by make install
-ynl_ethtool="../pyynl/ethtool.py"
+ynl_ethtool="./ethtool.py"
 
 readonly NSIM_ID="1337"
 readonly NSIM_DEV_NAME="nsim${NSIM_ID}"