selftests: drv-net: warn if LOCAL_V6 has DAD or not kept on link down

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napi_id.py intermittently fails to start its helper on Intel and Google
HW runners:

  CMD: /srv/netdev/drivers/net/napi_id_helper 3001::1 37569
    EXIT: 1
    STDERR: bind failed: Cannot assign requested address

Either keep_addr_on_down is not set or more likely the address is
configured without nodad. Having to make sure that all tests
always wait for DAD after impacting the link would be a whack-a-mole
so we expect the env to have nodad and keep_addr_on_down set.

Warn about both while validating the environment, and document this.
We could fail completely but most tests don't impact the link so for
quick local testing it'd be annoying to have to apply the settings.
I hope the warninging stikes the right balance.

Link: https://patch.msgid.link/20260908181956.1357684-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Kicinski 2026-09-08 11:19:56 -07:00

parent 8342c68435

commit 3929f55da2

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9

tools/testing/selftests/drivers/net/README.rst

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19

tools/testing/selftests/drivers/net/lib/py/env.py

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