ACK/Cmnt: [SRU][F:linux-bluefield][PATCH v1 0/1] UBUNTU: SAUCE: mlxbf-gige: autonegotiation fails to complete on BF2

[Tim Gardner]

On 4/18/24 23:10, Asmaa Mnebhi wrote:
> BugLink: https://bugs.launchpad.net/bugs/2062384
> 
> SRU Justification:
> 
> [Impact]
> 
> During the reboot test, QA found an intermittent issue where the OOB link is down.
> The link is down because the KSZ9031 PHY fails to complete autonegotiation.
> Even under "normal" circumstances where autonegotiation completes,
> it takes an abnormal time to do so (on average, at least 8 seconds).
> 
> Hence, the hardware team and Microchip are involved in this debug but the root cause is still unknown.
> In the meantime, we need to provide a software workaround since customers are starting to see this issue as well.
> 
> [Fix]
> 
> * Restart autonegotiation when it fails the first time.
> 
> [Test Case]
> 
> * On BF2, Do the reboot test: 2000 loops.
> * Check that the OOB link is up and ip is assigned.
> 
> [Regression Potential]
> 
> * no known regression.
> 
> [Other]
> * Note that this issue is BF2 hardware specific. The same ethernet code is used for BF3 and we don't see any issues. In fact, the link up time on BF3 <= 1s. On BF2, the link up time is > 8s.
> * we have been aware of this issue for 2 years and have shared this with the PHY vendor and the hardware team but there were not root causes identified.
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>

Kind of a hack. Hope you find the root cause.
-- 
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Tim Gardner
Canonical, Inc