543bdc1578cd380631558a884318551a0e9fdab2 - selftests: drv-net: cope with slow env in so_txtime.py test

Tue, 12 May 2026 00:19:20 +0200

selftests: drv-net: cope with slow env in so_txtime.py testThis test was converted from shell script to drv-net test.The new version is flaky in dbg builds on the netdev.bots dashboard.The previous shell script had more protections to avoid these. Addedin commit a7ee79b9c455 ("selftests: net: cope with slow env inso_txtime.sh test").Add the same overall protection:- Suppress so_txtime process failure if KSFT_MACHINE_SLOWAlso relax two timeouts to reduce the number of process failuresthemselves- Increase SO_RCVTIMEO to 2 seconds- Increase process start-up stabilization to 2 secondsDelays were experimentally arrived at while running with vngbuilt with kernel/configs/debug.configFixes: 5c6baef3885c ("selftests: drv-net: convert so_txtime to drv-net")Reported-by: Jakub Kicinski Closes: https://lore.kernel.org/netdev/20260510174219.74aeee6d@kernel.org/Signed-off-by: Willem de Bruijn Link: https://patch.msgid.link/20260511222138.2045551-1-willemdebruijn.kernel@gmail.comSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/so_txtime.c

5c6baef3885c0e16e63d432fe31aa6f7e98e18dc - selftests: drv-net: convert so_txtime to drv-net

Mon, 04 May 2026 19:38:34 +0200

selftests: drv-net: convert so_txtime to drv-netIn preparation for extending to pacing hardware offload, convert theso_txtime.sh test to a drv-net test that can be run against netdevsimand real hardware.Also update so_txtime.c to not exit on first failure, but run tocompletion and report exit code there. This helps with debuggingunexpected results, especially when processing multiple packets,as happens in the "reverse_order" testcase.Signed-off-by: Willem de Bruijn ----v6 -> v7- update test to use new argument expect_fail- v6 received Reviewed-by, but dropped due to above (minor) changev5 -> v6- fix order in tools/testing/selftests/drivers/net/configv4 -> v5- move qdisc setup/restore into each test- add tc to utils.py (separate patch)- test expected failure (separate patch)- fix pylint- convert fail to pass for timing errors if KSFT_MACHINE_SLOW (cmd does not special case KSFT_SKIP process returncode yet)Responses to sashiko review- The test converts per packet failure to errors, to continue testing other packets, but other error() cases are not in scope.- The test starts sender and receiver at an absolute future time, like the original test. This assumes ~msec scale sync'ed clocks.- The tc qdisc replace command works fine with noqueue. Tested manually.v3 -> v4- restore original qdisc after test- drop unnecessary underscore in tap test namesv2 -> v3- Makefile: so_txtime from YNL_GEN_FILES to TEST_GEN_FILES (Sashiko, NIPA)v1 -> v2- move so_txtime.c for net/lib to drivers/net (Jakub)- fix drivers/net/config order (Jakub)- detect passing when failure is expected (Jakub, Sashiko)- pass pylint --disable=R (Jakub)- only call ksft_run once (Jakub)- do not sleep if waiting time is negative (Sashiko)- add \n when converting error() to fprintf() (Sashiko)- 4 space indentation, instead of 2 space- increase sync delay from 100 to 200ms, to fix rare vng flakesLink: https://patch.msgid.link/20260504174056.565319-4-willemdebruijn.kernel@gmail.comSigned-off-by: Jakub Kicinski List of files: /linux/tools/testing/selftests/drivers/net/so_txtime.c

Changes in so_txtime.c

543bdc1578cd380631558a884318551a0e9fdab2 - selftests: drv-net: cope with slow env in so_txtime.py test

5c6baef3885c0e16e63d432fe31aa6f7e98e18dc - selftests: drv-net: convert so_txtime to drv-net