ACK/CMT: [SRU][AWS][F/J/N/O][[PATCH 0/6] Fix interrupt mappings which are set to a bad default after certain ENI operations

[Jian Hui Lee]

Hi Phil,

Some logs are missing in your F/J cherry-picked commit 65c7cdedeb30.
Other than that,
Acked-by: Jian Hui Lee <jianhui.lee at canonical.com>

>   2) While none of the other drivers prevents user space from changing
>      the affinity, a cursorily inspection shows that there are at least
>      expectations in some drivers.
>
#1 needs to be cleaned up anyway, so that's not a problem

#2 might result in subtle regressions especially when irqbalanced (which
>    nowadays ignores the affinity hint) is disabled.
>
> Provide new interfaces:
>


On Tue, Oct 22, 2024 at 7:31 PM Philip Cox <philip.cox at canonical.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/2009325
>
> SRU Justification:
>
> [Impact]
> Interrupt mapping is set to a bad default after certain ENI operations
>
> After using ethtool to update the (rx) ring buffer settings on an ENI, the interrupt CPU affinity for all tx-rx queues is reset to a bad default - CPU 0-31 - even if the ENI is on a different CPU socket (NUMA node). Another operation that causes the interrupt mapping to be reset to CPU 0-31 is moving an interface to a network namespace.
>
> [Fix]
>
> ENA driver version 2.12.3g. They mentioned that this commit in the ENA code looks like it addresses the bug: https://github.com/amzn/amzn-drivers/commit/ed7754cdf6ca0d4fb3d76906abc17718cc3ffa23
>
> It's included starting in driver version 2.12.0.
>
> I have back ported the patch from the AWS OOT driver, as well as any existing prerequisites needed.
>
> [Test Plan]
>
> I have tested this, as has AWS.
>
> [Where problems could occur]
>
> As this is an Ubuntu Sauce patch, if these changes make their was into the stable trees, or any patches touching this area of code, they may cause merge conflicts, or changes in behaviour which are unexpected.
>
> [Other]
> SF# f00396266
>
>
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