Changes in gro_lib.py

a57ddd89900480dc90fd9f553f7f71a8e875bf67 - selftests: drv-net: Check the features set by set_ethtool_feat()

Fri, 18 Sep 2026 13:25:28 +0200

selftests: drv-net: Check the features set by set_ethtool_feat()Read back the features after running ethtool -K to check if they wereactually applied. The drivers might refuse to set a feature silently andthe test could run with a different configuration than the requested one.Add a 'check' parameter to skip this, as the GRO "hw" mode handles thecase where HW GRO is cleared by the driver.Signed-off-by: Ovidiu Panait Reviewed-by: Nicolai Buchwitz Link: https://patch.msgid.link/20260918112529.96039-3-ovidiu.panait.rb@renesas.comSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/gro_lib.py

d3630df401a8ee91117db26b14a64520aa44fbdb - selftests: drv-net: Move _set_ethtool_feat() into lib

Fri, 18 Sep 2026 13:25:27 +0200

selftests: drv-net: Move _set_ethtool_feat() into libMove the _set_ethtool_feat() helper from gro_lib.py into lib, so that itcan be reused by the VLAN test added in the next commit. Drop the leadingunderscore, now that the helper is exported.Signed-off-by: Ovidiu Panait Reviewed-by: Nicolai Buchwitz Link: https://patch.msgid.link/20260918112529.96039-2-ovidiu.panait.rb@renesas.comSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/gro_lib.py

9a483b60a0ad67fbd55c23a0ebb96754e984f585 - selftests: drv-net: add BIG TCP test cases

Sun, 13 Sep 2026 07:24:19 +0200

selftests: drv-net: add BIG TCP test casesAdd four new test cases that validate coalescingunder increased size limits (BIG TCP):big_tcp_data_same - validates that equal-sized segments coalesce past the legacy IP_MAXPACKET limit.big_tcp_data_lrg_sml - validates that a smaller final segment coalesces into the previous chain of large-sized segments while crossing the IP_MAXPACKET limit.big_tcp_tcp_seq - validates that a packet with a wrong sequence number doesn't coalesce. The test uses a sequence number for which the low 16 bits correspond to the correct sequence number to validate against truncation bugs, since total aggregate length crosses over the legacy size limit for BIG TCP.big_tcp_large_max - validates that coalescing stops at the configured BIG TCP limit.Use a gro_flush_timeout value 2x higher for the BIG TCP test casesto prevent under-coalescing.Signed-off-by: Narcisa Vasile Link: https://patch.msgid.link/20260913052419.77910-1-narcisav.kernel@gmail.comSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/gro_lib.py

348ea4642f56ab3dc93621c8e3ab0ccd0e5f1782 - selftests: net: add ctl_file_write() helper

Wed, 09 Sep 2026 20:00:09 +0200

selftests: net: add ctl_file_write() helperSetting a sysctl or a sysfs attribute for the duration of a test andputting the old value back has been open coded multiple times.We generally avoid creating library helpers but this one is verycommon, and the defer is a little tricky as using the same functionfor defer as the initial write leads to an infinite loop (not thatI would ever make such mistake!)Some of the conversions are not identical, but arguably ctl_file_write()semantics are more correct.Reviewed-by: Nimrod Oren Reviewed-by: Bobby Eshleman Link: https://patch.msgid.link/20260909180009.1894019-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/gro_lib.py

f225a7317c18f2009fb4cdcc75337c726b6dda88 - selftests: drv-net: split gro.py into one test per coalescing mode

Tue, 01 Sep 2026 22:07:27 +0200

selftests: drv-net: split gro.py into one test per coalescing modegro.py runs its full set of cases three times over - against SW GRO,HW GRO and LRO. It's our test with the longest runtime. The 318 casestake 12m30s on mlx5 with a debug kernel.Bumping the timeout for all tests feels wrong when we can so easilysplit the GRO test by execution mode. Shorter runtime also helps retryjust the failing portion / mode (we retry failing tests to try todetect flakes vs real failures).Move the main logic to gro_lib.py and add one program per mode -gro_sw.py, gro_hw.py and gro_lro.py, 102 cases each. Move PPPoE toa dedicated test. It has been tacked onto the tests in an ugly way,and it only runs against SW GRO anyway.Note that unfortunately this will case a rename of all test cases.The mode moves from the case name to the test name gro.py test.sw_ipv4_data_samebecomes gro_sw.py test.ipv4_data_sameReviewed-by: Joe Damato Reviewed-by: Nimrod Oren Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260901200728.2063720-3-kuba@kernel.orgSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/gro_lib.py