Problem configuring vhost-user NICs with multi queues (RSS) support

Problem configuring vhost-user NICs with multi queues (RSS) support

[Adel Belkhiri]

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Hi all,

I have a problem with the configuration of the sample application l3fdw for
switching traffic between two vhost-user NICs, each with 4 queues. The
traffic was generated using TREX, running inside a VM.

When I traced my experiment, I noticed that the traffic was only received
in queue "0", while the other RX queues were empty. When I run the
application, a msg is printed "Port 1 modified RSS hash function based on
hardware support,requested:0xa38c configured:0".

It seems that while the vhost-user NIC implementation supports multiple
queues, it does not support distributing the traffic between the RX queues.

I wonder if there is a way to make it work?

Thank you,

PS:
- DPDK version: 19.08
- Qemu version: 4.2.1

Adele

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RE: Problem configuring vhost-user NICs with multi queues (RSS) support

[Pathak, Pravin]

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Does your traffic have multiple 5 tuple flows to distribute it across multiple Rx queues?

From: Adel Belkhiri <adel.belkhiri@gmail.com>
Sent: Tuesday, June 7, 2022 7:29 PM
To: users@dpdk.org
Subject: Problem configuring vhost-user NICs with multi queues (RSS) support

Hi all,

I have a problem with the configuration of the sample application l3fdw for switching traffic between two vhost-user NICs, each with 4 queues. The traffic was generated using TREX, running inside a VM.

When I traced my experiment, I noticed that the traffic was only received in queue "0", while the other RX queues were empty. When I run the application, a msg is printed "Port 1 modified RSS hash function based on hardware support,requested:0xa38c configured:0".

It seems that while the vhost-user NIC implementation supports multiple queues, it does not support distributing the traffic between the RX queues.

I wonder if there is a way to make it work?

Thank you,

PS:
- DPDK version: 19.08
- Qemu version: 4.2.1

Adele

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Problem configuring vhost-user NICs with multi queues (RSS) support

[Adel Belkhiri]

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Hi all,

I have a problem with the configuration of the sample application l3fdw for
switching traffic between two vhost-user NICs, each with 4 queues. The
traffic was generated using TREX, running inside a VM.

When I traced my experiment, I noticed that the traffic was only received
in queue "0", while the other RX queues were empty. When I run the
application, a msg is printed "Port 1 modified RSS hash function based on
hardware support,requested:0xa38c configured:0".

It seems that while the vhost-user NIC implementation supports multiple
queues, it does not support distributing the traffic between the RX queues.

I wonder if there is a way to make it work?

Thank you,

PS:
- DPDK version: 19.08
- Qemu version: 4.2.1

Adele

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