[PATCH net-next v2] selftests: drv-net: hide the devlink port_split test

[Jakub Kicinski <kuba@kernel.org>]

The devlink port_split test has limited applicability.
NICs (as opposed to switches) require at least a re-probe
to apply the split configuration.

On top of that the test is not compatible with our driver env,
it just splits all ports on the system, not only what NETIF
points at.

Long term we may want to add some indication in devlink whether
the port splitting is runtime (cmode of sorts), and fix the
test to follow driver env. But since no (known) NIC driver can
support runtime anyway let's just hide the test from the selftest
framework by moving it to extra files.

Having this test randomly break unrelated NICs within the DUT
makes people implement allow-lists for ksft, which then means
their setups don't run new tests. It's very useful during test
review to see whether the test works across all the runners.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
v2:
 - use TEST_PROGS_EXTENDED instead of TEST_FILES
v1: https://lore.kernel.org/20260808164843.2475226-1-kuba@kernel.org

CC: danieller@nvidia.com
CC: petrm@nvidia.com
CC: shuah@kernel.org
CC: linux-kselftest@vger.kernel.org
---
 tools/testing/selftests/drivers/net/hw/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 234db5c2c90c..78bb0169350b 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -19,7 +19,6 @@ TEST_GEN_FILES := \
 
 TEST_PROGS = \
 	csum.py \
-	devlink_port_split.py \
 	devlink_rate_cross_esw.py \
 	devlink_rate_tc_bw.py \
 	devmem.py \
@@ -54,6 +53,10 @@ TEST_PROGS = \
 	xsk_reconfig.py \
 	#
 
+TEST_PROGS_EXTENDED := \
+	devlink_port_split.py \
+# end of TEST_PROGS_EXTENDED
+
 TEST_FILES := \
 	devmem_lib.py \
 	ethtool_lib.sh \
-- 
2.55.0