** Also affects: linux-bluefield (Ubuntu Jammy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2064163
Title:
mlxbf-gige: Vitesse PHY stuck in a bad state during reboot test
Status in linux-bluefield package in Ubuntu:
New
Status in linux-bluefield source package in Jammy:
New
Bug description:
SRU Justification:
[Impact]
During the QA reboot test, the BF3 Vitesse PHY gets stuck in a bad state,
resulting in no ip provisioning. The only way to recover is to powercycle.
We might have found a software workaround to avoid getting in this state in
the first place: suspend the PHY during graceful shutdown. Suspend the PHY =
Power down = set bit 11 to 1 in reg 0 of the PHY. This WA passed 1800 reboots
on QA's setup.
[Fix]
* During reboot, the mlxbf_gige_shutdown() function makes a call to
phy_stop(). phy_stop() calls phy_suspend().
* Certain Linux PHY drivers, like the Vitesse PHY, don't support suspend() to
power down the PHY during shutdown.
* Our Hardware also does not toggle the hard reset signal of the PHY during
reboot.
* Hence, when the PHY is in a bad state, it stays in its bad state until
powercycle.
* We have found a way to prevent the PHY from entering this bad state by
suspending the PHY in the case of reboot.
[Test Case]
* do the reboot test (at least 2000 reboots): run 'reboot' from linux.
* Check that the oob_net0 interface is up and the ip is assigned.
* please note that if the the OOB doesn't get an ip, try reloading the driver
(rmmod/modprobe). it that solves the issue, that would be a different bug. In
the bug at stake, nothing recovers the OOB ip except power cycle.
[Regression Potential]
* Make sure the redfish DHCP is still working during the reboot test
* Make sure the OOB gets an ip
[Other]
These changes were made both in the mlxbf-gige driver and UEFI
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