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

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This 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. Added
in commit a7ee79b9c4 ("selftests: net: cope with slow env in
so_txtime.sh test").

Add the same overall protection:

- Suppress so_txtime process failure if KSFT_MACHINE_SLOW

Also relax two timeouts to reduce the number of process failures
themselves

- Increase SO_RCVTIMEO to 2 seconds
- Increase process start-up stabilization to 2 seconds

Delays were experimentally arrived at while running with vng
built with kernel/configs/debug.config

Fixes: 5c6baef388 ("selftests: drv-net: convert so_txtime to drv-net")
Reported-by: Jakub Kicinski <kuba@kernel.org>
Closes: https://lore.kernel.org/netdev/20260510174219.74aeee6d@kernel.org/
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260511222138.2045551-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Willem de Bruijn 2026-05-11 18:19:20 -04:00 committed by Jakub Kicinski
parent 73d587ae68
commit 543bdc1578
2 changed files with 17 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/testing/selftests/drivers/net/so_txtime.c
View File

@ -38,6 +38,7 @@
static int cfg_clockid = CLOCK_TAI;
static uint16_t cfg_port = 8000;
static int cfg_variance_us = 4000;
static bool cfg_machine_slow;
static uint64_t cfg_start_time_ns;
static int cfg_mark;
static bool cfg_rx;
@ -142,7 +143,7 @@ static void do_recv_one(int fdr, struct timed_send *ts)
if (llabs(tstop - texpect) > cfg_variance_us) {
fprintf(stderr, "exceeds variance (%d us)\n", cfg_variance_us);
if (!getenv("KSFT_MACHINE_SLOW"))
if (!cfg_machine_slow)
errors++;
}
}
@ -263,7 +264,7 @@ static void start_time_wait(void)
now = gettime_ns(CLOCK_REALTIME);
if (cfg_start_time_ns < now) {
fprintf(stderr, "FAIL: start time already passed\n");
if (!getenv("KSFT_MACHINE_SLOW"))
if (!cfg_machine_slow)
errors++;
return;
}
@ -326,6 +327,9 @@ static int setup_rx(struct sockaddr *addr, socklen_t alen)
if (bind(fd, addr, alen))
error(1, errno, "bind");
if (cfg_machine_slow)
tv.tv_sec = 2;
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
error(1, errno, "setsockopt rcv timeout");
@ -512,6 +516,8 @@ static void parse_opts(int argc, char **argv)
setup_sockaddr(domain, saddr, &cfg_src_addr);
cfg_num_pkt = parse_io(argv[optind], cfg_buf);
cfg_machine_slow = getenv("KSFT_MACHINE_SLOW");
}
int main(int argc, char **argv)

11
tools/testing/selftests/drivers/net/so_txtime.py
View File

@ -6,6 +6,7 @@
Test delivery time in FQ and ETF qdiscs.
"""
import os
import time
from lib.py import ksft_exit, ksft_run, ksft_variants
@ -15,17 +16,23 @@ from lib.py import NetDrvEpEnv, bkg, cmd, defer, tc
def test_so_txtime(cfg, clockid, ipver, args_tx, args_rx, expect_success):
"""Main function. Run so_txtime as sender and receiver."""
slow_machine = os.environ.get('KSFT_MACHINE_SLOW')
bin_path = cfg.test_dir / "so_txtime"
tstart = time.time_ns() + 200_000_000
tstart = time.time_ns() + (2000_000_000 if slow_machine else 200_000_000)
cmd_addr = f"-S {cfg.addr_v[ipver]} -D {cfg.remote_addr_v[ipver]}"
cmd_base = f"{bin_path} -{ipver} -c {clockid} -t {tstart} {cmd_addr}"
cmd_rx = f"{cmd_base} {args_rx} -r"
cmd_tx = f"{cmd_base} {args_tx}"
expect_fail = not expect_success
if slow_machine:
expect_success = False
with bkg(cmd_rx, host=cfg.remote, fail=expect_success,
expect_fail=(not expect_success), exit_wait=True):
expect_fail=expect_fail, exit_wait=True):
cmd(cmd_tx)