Can not disable RSS. Error: dpdk: DpdkDevice::configureRSS() has failed

[ilya-varivchenko]

I have troubles trying to work with DPDK and ipfixprobe

my hardware:

Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 02)

Silicom PE310G4171LB-XR v:1.8

my config:

input_plugin:
dpdk:
allowed_nics: "0000:81:00.3"
rx_queues: 2

output_plugin:
ipfix:
collector:
host: '127.0.0.1'
port: 4739
protocol:
udp: {}

output:

EAL: Detected CPU lcores: 32
EAL: Detected NUMA nodes: 2
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
EAL: Using IOMMU type 1 (Type 1)
I40E_DRIVER: i40e_GLQF_reg_init(): i40e device 0000:81:00.3 changed global register [0x002689a0]. original: 0x00000000, new: 0x00000029
I40E_DRIVER: i40e_GLQF_reg_init(): i40e device 0000:81:00.3 changed global register [0x00268ca4]. original: 0x00001840, new: 0x00009420
Capabilities of the port 0 with driver net_i40e:
RX offload: 599663
flow type RSS offloads: 32504
Detected RSS offload capability: yes
Detected HW timestamp capability: no
DPDK RX queues for port 0 set up. Size of each queue: 4096
RTE_ETH_RSS_IP is not supported by the card. Used subset: 8840
Setting RSS {8840} for port 0 failed. Errno:-22
Error: dpdk: DpdkDevice::configureRSS() has failed.

I have tried all the options for configuring RSS but have not been successful. How can I completely disable it?

[SiskaPavel]

Hi,
thank you for your report.

Unfortunately, RSS cannot be fully disabled. To properly diagnose what your device and driver actually support, we need a bit more information about your environment and the capabilities reported by DPDK.

To verify the port configuration, please use dpdk-testpmd, which is the standard DPDK utility for inspecting and testing NIC features.
(Ensure that hugepages are allocated before running.)

Please run:

dpdk-testpmd -a 0000:81:00.3 -- -i

Once inside the interactive prompt, execute:

show port info 0

This will print the complete capability set of the port, including supported RSS hash types, RSS key size, queue configuration limits, offloads, and driver options.

Please copy and paste the full output of the dpdk-testpmd here. Also provide your DPDK package version and OS.

Pavel

[ilya-varivchenko]

pdk-testpmd -a 0000:81:00.3 -- -i
EAL: Detected CPU lcores: 32
EAL: Detected NUMA nodes: 2
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
EAL: Using IOMMU type 1 (Type 1)
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=395456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
testpmd: create a new mbuf pool <mb_pool_1>: n=395456, size=2176, socket=1
testpmd: preferred mempool ops selected: ring_mp_mc

Warning! port-topology=paired and odd forward ports number, the last port will pair with itself.

Configuring Port 0 (socket 1)
Port 0: 00:E0:ED:78:4B:3F
Checking link statuses...
Done
testpmd> show port info 0

********************* Infos for port 0 *********************
MAC address: 00:E0:ED:78:4B:3F
Device name: 0000:81:00.3
Driver name: net_i40e
Firmware-version: 5.05 0x80002aab 0.0.0
Devargs:
Connect to socket: 1
memory allocation on the socket: 1
Link status: up
Link speed: 10 Gbps
Link duplex: full-duplex
Autoneg status: On
MTU: 1500
Promiscuous mode: enabled
Allmulticast mode: disabled
Maximum number of MAC addresses: 64
Maximum number of MAC addresses of hash filtering: 0
VLAN offload:
strip off, filter off, extend off, qinq strip off
Hash key size in bytes: 52
Redirection table size: 512
Supported RSS offload flow types:
ipv4-frag ipv4-tcp ipv4-udp ipv4-sctp ipv4-other
ipv6-frag ipv6-tcp ipv6-udp ipv6-sctp ipv6-other
l2-payload
Minimum size of RX buffer: 1024
Maximum configurable length of RX packet: 9728
Maximum configurable size of LRO aggregated packet: 0
Maximum number of VMDq pools: 32
Current number of RX queues: 1
Max possible RX queues: 192
Max possible number of RXDs per queue: 8160
Min possible number of RXDs per queue: 64
RXDs number alignment: 32
Current number of TX queues: 1
Max possible TX queues: 192
Max possible number of TXDs per queue: 8160
Min possible number of TXDs per queue: 64
TXDs number alignment: 32
Max segment number per packet: 255
Max segment number per MTU/TSO: 8
Device capabilities: 0x3( RUNTIME_RX_QUEUE_SETUP RUNTIME_TX_QUEUE_SETUP )
Device error handling mode: none
Device private info:
none

cat /etc/os-release
NAME="Rocky Linux"
VERSION="9.6 (Blue Onyx)"
ID="rocky"
ID_LIKE="rhel centos fedora"
VERSION_ID="9.6"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Rocky Linux 9.6 (Blue Onyx)"
ANSI_COLOR="0;32"
LOGO="fedora-logo-icon"
CPE_NAME="cpe:/o:rocky:rocky:9::baseos"
HOME_URL="https://rockylinux.org/"
VENDOR_NAME="RESF"
VENDOR_URL="https://resf.org/"
BUG_REPORT_URL="https://bugs.rockylinux.org/"
SUPPORT_END="2032-05-31"
ROCKY_SUPPORT_PRODUCT="Rocky-Linux-9"
ROCKY_SUPPORT_PRODUCT_VERSION="9.6"
REDHAT_SUPPORT_PRODUCT="Rocky Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="9.6"

uname -a
Linux sensor4 5.14.0-570.58.1.el9_6.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Oct 31 13:55:05 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

rpm -qa | grep dpdk
dpdk-24.11.1-2.el9.x86_64
dpdk-devel-24.11.1-2.el9.x86_64
dpdk-doc-24.11.1-2.el9.noarch
dpdk-tools-24.11.1-2.el9.x86_64

[SiskaPavel]

Hi,
I found an identical card in our lab and tried to reproduce your issue. I ran into the same problem: when using multiple RX queues with i40e, the RSS configuration fails with Errno:-22.

I investigated the cause and confirmed that it is related to how i40e handles RSS. Briefly, the problem was not a limitation of DPDK itself or ipfixprobe, but a hardware/driver requirement for the i40e NIC regarding RSS configuration timing.

I will prepare a fix in our code, and I will let you know once the fix is ready.

Pavel

[ilya-varivchenko]

Hi, I found an identical card in our lab and tried to reproduce your issue. I ran into the same problem: when using multiple RX queues with i40e, the RSS configuration fails with Errno:-22.

I investigated the cause and confirmed that it is related to how i40e handles RSS. Briefly, the problem was not a limitation of DPDK itself or ipfixprobe, but a hardware/driver requirement for the i40e NIC regarding RSS configuration timing.

I will prepare a fix in our code, and I will let you know once the fix is ready.

Pavel

Thank you!