iproute2 version 4.20 - RTNETLINK answers: No such file or directory
 

Hi,

I am trying to load Earliest Txtime Feature (ETF) in my Linux kernel 4.19.0.
When I try to load, I am blocked by two errors saying,

• RTNETLINK answers: Invalid Argument
• RTNETLINK answers: No such file or directory

I want this feature to be enabled to get time triggered send working. Any help on this would be appreciated!

System details:
Operating system: Linux Mint 18.1
Linux kernel: 4.19.0

What ETF do you talk about, tc-etf or something else?

Yes, You are right. I meant the ETF feature available under tc.

What's output of "tc qdisc show"? The command can check tc package status.

Output of "tc qdisc show" gives the default pfifo scheduling policies available in the interface. When I try to replace it with my own scheduling policy using ETF feature, it throws me two error saying the following:

• RTNETLINK answers: Invalid Argument
• RTNETLINK answers: No such file or directory

Example commands I am trying to load in interface:
tc qdisc replace dev enp2s0 parent root mqprio num_tc 3 map 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@0 1@1 2@2 hw 0
tc qdisc add dev enp2s0 parent 100:1 etf offload delta 200000 clockid CLOCK_TAI

Thanks in advance!

It look like the socket in your Linux kernel doesn't support SO_TXTIME socket option.

SO_TXTIME facility is available in the kernel I am working on (v4.19.0). [Link: https://git.kernel.org/pub/scm/linux...?h=v4.19#n1030]

With default scheduling available in i210 NIC, I am able to use SO_TXTIME feature. My issue is, I face difficulties in scheduling the data based on priority using ETF kernel module.

The priority packet is different module. You need check whether the module is on.