Re: [REGRESSION] aquantia: Sunshine/Moonlight UDP video streaming broken since 5b4015ad833c ("net: aquantia: Remove redundant UDP length adjustment with GSO_PARTIAL")

[Gal Pressman]

Hello Matthew,

On 27/04/2026 2:20, Matthew Schwartz wrote:
> Hello,
> 
> When using a previously working setup of remote streaming from my workstation to another device via Sunshine (the host server) and Moonlight (the client app) on my home network, I no longer receive any video output on the client app after upgrading my host workstation to kernel 7.0. Reverting back to kernel 6.19 on the host restored my setup to a working state.
> 
> After bisecting, I landed on 5b4015ad833c ("net: aquantia: Remove redundant UDP length adjustment with GSO_PARTIAL") as the first bad commit. I confirmed this by moving the cable to my second on-board NIC (Intel) on the same workstation, which restored video output without any other kernel changes. My affected on-board NIC is Aquantia AQC113 [1d6a:04c0] (rev 03), atlantic driver, firmware 1.3.34, MTU 1500.
> 
> Looking into it a bit further, ethtool -K enp97s0 tx-udp-segmentation off also serves as a workaround on my Aquantia port without changing to my other ethernet port. The working Intel NIC reports tx-udp-segmentation as "off [fixed]", so traffic falls back to software UDP segmentation on there.
> 
> Please let me know if there's any additional info I can provide.
> 
> Thanks,
> Matt
> 
> #regzbot introduced: 5b4015ad833c

Thank you for the report and the bisect!

I will take a look and try to figure out what's wrong (though I don't
have real hardware to test on).
Is the userspace app open source? can I see its code and try to run it
myself?

I will be OOO for the rest of the week, hope to have some meaningful
reply by the end of next week.