Add configurable link-up delay to simulate real NIC carrier negotiation#2
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edcdavid wants to merge 1 commit into
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Add configurable link-up delay to simulate real NIC carrier negotiation#2edcdavid wants to merge 1 commit into
edcdavid wants to merge 1 commit into
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Real NICs don't bring carrier up instantly — there is link negotiation, PHY training, etc. Add a per-port link_up_delay_ms debugfs knob (default 0 = instant) that keeps carrier off after ip link set up and fires netif_carrier_on via a delayed work after the configured delay. PTP clocks remain accessible throughout. Includes a CI smoke test that sets a 3s delay, verifies carrier stays down during the delay, comes up after, and confirms PTP clock sync still works.
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Summary
link_up_delay_msdebugfs knob (default 0 = instant, backward-compatible) that keeps carrier off afterip link set upand firesnetif_carrier_onvia a delayed work after the configured delayTest plan
dkms-testpasses on ubuntu-22.04 and ubuntu-24.04Assisted-By: Cursor