No link on Intel E810 and E823 after upgrade to 26.7, when ice_ddp is loaded

[Fantorangen]

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Describe the bug

Unit with both Intel E810 and E823 25Gbase NICs, ice driver. No link on these after upgrade from 26.1.* to 26.7 and further 26.7.4 while DDP is loaded.

To Reproduce

Have a unit with 25Gbase Intel E8xx series NICs, and try to load the DDP to have decent performance in tunables/loader.conf: ice_ddp_load="YES"

Expected behavior

No issues, link on NICs and improved performance

Describe alternatives you considered

Changing NICs.. Manually installing the latest Intel FreeBSD 2.1.8 driver, but unsure how that would be supported forwards..
Running without ice_ddp_load="YES" now, which results in about 1Gbps throughput pr NIC.

Environment

Software version used and hardware type if relevant, e.g.:

OPNsense 26.7.4 (amd64).
E810-XXV fw 7.6.2 api 1.7 nvm 4.60
E823-C fw 7.1.6 api 1.7 nvm 3.26
ICE OS Default Package version 1.3.41.0

[fichtner]

See forum here https://forum.opnsense.org/index.php?topic=52405.0

Seems like some people are affected, but the parameters are unclear.

[Fantorangen]

Yes, I've seen and commentet on that thread. I see the ones that achieve link are not requesting any FEC, but seem to be able to establish link with and without negotiated FEC?
I see my NICs are requesting RS-FEC, if that can be of any interest..

[Fantorangen]

Looks like #317 is experiencing similar issues and has done some work into rolling out DAC/!FEC
I use 25Gbase-SR optics on these NICs