selftests: drv-net: extend so_txtime with hw offload

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Add two pacing hardware offload variants

1. one that uses FQ to safely offload when within bounds.
2. one that uses pfifo_fast and thus forwards all packets.

Verify that the packets are paced in hardware with new flag '-H'.

Also increase rcvtimeout significantly to reduce flakiness. Especially
for the new beyond_hw_horizon test, which is close to the 100ms limit.
But update recv_verify_empty to take MSG_DONTWAIT. That last empty
check must not delay each testcase by the receive timeout.

Hardware pacing offload can complete packets out of order. So the
reverse_order test is expected to pass with pfifo_fast too.

Do not test ETF, which does not change its dequeue behavior based on
pacing_offload.

The pfifo_fast beyond_hw_horizon testcase expects a failure because
the packet exceeds the hardware horizon and is transmitted immediately,
violating receiver arrival bounds. On slow machines (KSFT_MACHINE_SLOW),
timing variance errors are suppressed by the receiver, so relax the
failure expectation only for this timing-sensitive case while preserving
deterministic checks for other tests (such as ETF invalid txtime).

Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260910171131.2532487-8-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Willem de Bruijn 2026-09-10 13:10:26 -04:00 • committed by Jakub Kicinski

parent 4e50c0265f

commit ac48ee5339

2 changed files with 79 additions and 5 deletions

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4

tools/testing/selftests/drivers/net/so_txtime.c

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80

tools/testing/selftests/drivers/net/so_txtime.py

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