RTNETLINK answers: Operation not supported

[stephandave78]

Hi @jeez @vcgomes ,

I was reading about the previously closed issue with respect to loading of ETF in dual core PCs. I was able to follow that and I got the mqprio qdisc loaded in my system successfully.

But when I try adding ETF as child to mqprio qdisc, system replies me " RTNETLINK answers: Operation not supported" error. Help me in solving this.

System details:
Linux x86 with 4.19 kernel and iproute2 4.19 version

Commands used:
sudo tc qdisc replace dev IFACE parent root handle 100 mqprio num_tc 2 map 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 queues 1@0 1@1 hw 0
sudo tc qdisc add dev IFACE parent 100:1 etf offload clockid CLOCK_TAI delta 150000

[vcgomes]

What are the network controllers that you are using? Right now, only Intel i210's support ETF offloading.

[stephandave78]

@vcgomes
At our end, we have i211 network controller. Is there any possibility of patching up the igb driver to support ETF offload in i211 controller?

Thanks.

[vcgomes]

Reading the i211 datasheet, I get the impression that it doesn't support the LaunchTime feature really, as the datasheet doesn't have any references to the TQAVCTRL register, which enabled the mode that enables the LaunchTime transmit descriptor to be used.

But if you want to confirm it from your side in practice, something like this patch (not tested) might do the job:

https://gist.github.com/vcgomes/960af8f98424ba18ba531241fa22be61

But I don't have high hopes for it.