linux-toradex.git/tools/testing/selftests/drivers/net/gro_lib.py, branch master

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

2026-09-24T15:28:28+00:00

Read back the features after running ethtool -K to check if they were
actually applied. The drivers might refuse to set a feature silently and
the test could run with a different configuration than the requested one.

Add a 'check' parameter to skip this, as the GRO "hw" mode handles the
case 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.com
Signed-off-by: Jakub Kicinski

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

2026-09-24T15:28:28+00:00

Move the _set_ethtool_feat() helper from gro_lib.py into lib, so that it
can be reused by the VLAN test added in the next commit. Drop the leading
underscore, 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.com
Signed-off-by: Jakub Kicinski

selftests: drv-net: add BIG TCP test cases

2026-09-17T02:13:28+00:00

Add four new test cases that validate coalescing
under 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 cases
to prevent under-coalescing.

Signed-off-by: Narcisa Vasile 
Link: https://patch.msgid.link/20260913052419.77910-1-narcisav.kernel@gmail.com
Signed-off-by: Jakub Kicinski

selftests: net: add ctl_file_write() helper

2026-09-11T01:46:40+00:00

Setting a sysctl or a sysfs attribute for the duration of a test and
putting the old value back has been open coded multiple times.

We generally avoid creating library helpers but this one is very
common, and the defer is a little tricky as using the same function
for defer as the initial write leads to an infinite loop (not that
I 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.org
Signed-off-by: Jakub Kicinski

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

2026-09-03T01:33:33+00:00

gro.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 cases
take 12m30s on mlx5 with a debug kernel.

Bumping the timeout for all tests feels wrong when we can so easily
split the GRO test by execution mode. Shorter runtime also helps retry
just the failing portion / mode (we retry failing tests to try to
detect 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 to
a 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_same

becomes

  gro_sw.py test.ipv4_data_same

Reviewed-by: Joe Damato 
Reviewed-by: Nimrod Oren 
Reviewed-by: Willem de Bruijn 
Link: https://patch.msgid.link/20260901200728.2063720-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski