This behavior is needed to conserve power when the CX7 cable is unplugged.
Otherwise, the CX7 controllers would still consume power and negatively impact
the
board’s overall power consumption.
This driver helps save power when the CX7 cable is absent.
The driver detects cable hot‑plug or unplug events, enables or disables the
corresponding links,
emits udev events, and then the user space triggers removal and rescanning of
the PCIe device.
Testing performed includes:
1. Repeated CX7 plug/unplug cycles, verifying that the PCIe link transitions
correctly.
2. Ensured no side effects or hangs.
3. Hence, regression risk is considered to be low.
4. It is also being tested by SW QA.
Automated testing:
We have included the dgx-spark-mlnx-hotplug package in the BaseOS, which
provides a
standalone userspace script that can be used for automated testing.
To validate the driver without manual intervention, run the following:
1. Plug-in:
/opt/nvidia/dgx-spark-mlnx-hotplug/mtk-hotplug-handler.sh plug-in
2. Unplug:
/opt/nvidia/dgx-spark-mlnx-hotplug/mtk-hotplug-handler.sh removal
3. After each operation, run lspci and verify the results:
a. When plugged-in: The output should show
“Ethernet controller: Mellanox Technologies MT2910 Family [ConnectX-7]”
PCIe devices.
b. When plugged-out: There should be no PCIe device entry with
“Ethernet controller: Mellanox Technologies MT2910 Family [ConnectX-7]”.
We plan to upstream this driver during the merge window for the next Linux
kernel release,
expected to open in the January-February 2026 timeframe(anticipated to be
kernel 6.20).
Necessary support will be provided.
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https://bugs.launchpad.net/bugs/2120474
Title:
mediatek EINT driver for NVIDIA CX7 hotplug management
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