Do you have some way to file a bug with us through your factory contact? 
Otherwise I will file a bug and then relay the info via email.

Todd Fujinaka
Software Application Engineer
Ethernet Products Group
Intel Corporation
todd.fujin...@intel.com

-----Original Message-----
From: David Hayes <dav...@simula.no> 
Sent: Wednesday, April 13, 2022 5:27 AM
To: e1000-de...@lists.sf.net
Subject: [E1000-devel] tc changing mqprio parameters X710-T4L


Hi list,

We are using a couple of X710-T4L cards in an experimental testbed. The 
computer with the cards is currently manjaro linux
5.17rc7 kernel, and cards have been updated with the latest nvm 8.60. As part 
of the work we wish to periodically change the shapers' max_rate parameter.

We set up the qdisc as follows:

# tc qdisc replace dev <interface> root mqprio num_tc 1 hw 1 mode
  channel shaper bw_rlimit min_rate 0Mbit max_rate 500Mbit map 0 0
  0 0 0 0 0 0 queues 1@0

This works well and we are able to confirm the 500Mbit limit experimentally.

However, when we try to change the speed:

# tc qdisc change dev <interface> root mqprio num_tc 1 hw 1 mode
  channel shaper bw_rlimit min_rate 0Mbit max_rate 200Mbit map 0 0
  0 0 0 0 0 0 queues 1@0

we get the following error message:

Change operation is not supported by specified qdisc

We are also unable use "replace" a second time.

I know our use case is a little unusual, but it is simple. Does anyone have any 
ideas what the problem could be and how we can fix it or work around it?

Many thanks,

David



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