EOPNOTSUPP on Intel I226-V, I218-LM and RTL8125

[Christoph]

Hi,

we are trying to setup a test environment for grout
and run into the following error when starting it:

+ interface add port e1g1 devargs 0000:04:00.0 rxqs 2
EAL: Driver cannot attach the device (0000:04:00.0)
EAL: Failed to attach device on primary process
error: command failed: Operation not supported (EOPNOTSUPP)
grout.service: Control process exited, code=exited, status=1/FAILURE

Is it possible to use grout with Intel I226-V NICs?
We were able to use that NIC with VPP/DPDK.

According to the DPDK documentation these NICs should be supported:
https://core.dpdk.org/supported/nics/intel/

We also get the same error using the RTL8125:
https://core.dpdk.org/supported/nics/realtek/

We _are_ able to start grout when using the Intel X710 NICs only on the 
same host while excluding the I226-V and Realtek NICs from the 
grout.init configuration.

We see the exact same error (EOPNOTSUPP) on Fedora 44
using an Intel I218-LM on a different host.

lspci:
------
...
04:00.0 Ethernet controller [0200]: Intel Corporation Ethernet 
Controller I226-V [8086:125c] (rev 04)
...

dpdk-devbind.py -s
-------------------
Network devices using DPDK-compatible driver
0000:03:00.0 'RTL8125 2.5GbE Controller 8125' drv=vfio-pci unused=r8169
0000:04:00.0 'Ethernet Controller I226-V 125c' drv=vfio-pci unused=igc
0000:05:00.0 'Ethernet Controller X710 for 10GbE SFP+ 1572' drv=vfio-pci 
unused=i40e
0000:05:00.1 'Ethernet Controller X710 for 10GbE SFP+ 1572' drv=vfio-pci 
unused=i40e

grout.init:
--------------
# Datapath CPU affinity
affinity cpus set control 0,1 datapath 2,22,4,24

# Physical ports creation
interface add port e1g1 devargs 0000:04:00.0  rxqs 2

# Interface addresses
address add 10.0.3.25/24 iface e1g1

used versions:
--------------
debian 13
linux:		6.12.88+deb13-amd64
dpdk           24.11.4-0+deb13u1
grout          0.15.0+72-g62e9b088
I226-V firmware-version: 2017:888d

we used the edge deb package:
https://github.com/DPDK/grout/releases/download/edge/grout_amd64.deb
from 2026-05-05
sha256:5daa7b1f3f2871f1ceba02f6f4cce5d11766c3f2df95996e17bf87e87a38970e
and also get the same error using v0.15.0:
https://github.com/DPDK/grout/releases/download/v0.15.0/grout_amd64.deb

Although we mentioned multiple NICs we would like to proceed debugging 
with the Intel I226-V NIC.

best regards,
Christoph

more verbose (-vvvv) grout output for the error using I226-V:
------------------------------------------------
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: alloc_seg(): mmap() failed: Cannot allocate memory
EAL: Ask a virtual area of 0x40000000 bytes
EAL: Virtual area found at 0x140000000 (size = 0x40000000)
EAL: attempted to allocate 1 segments, but only 0 were allocated
EAL: Restoring previous memory policy: 4
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: Restoring previous memory policy: 4
EAL: request: mp_malloc_sync
EAL: No shared files mode enabled, IPC is disabled
EAL: Heap on socket 0 was expanded by 4MB
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: alloc_seg(): mmap() failed: Cannot allocate memory
EAL: Ask a virtual area of 0x40000000 bytes
EAL: Virtual area found at 0x140000000 (size = 0x40000000)
EAL: attempted to allocate 1 segments, but only 0 were allocated
EAL: Restoring previous memory policy: 4
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: Restoring previous memory policy: 4
EAL: request: mp_malloc_sync
EAL: No shared files mode enabled, IPC is disabled
EAL: Heap on socket 0 was expanded by 26MB
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: Restoring previous memory policy: 4
EAL: request: mp_malloc_sync
EAL: No shared files mode enabled, IPC is disabled
EAL: Heap on socket 0 was expanded by 130MB
EAL: Trying to obtain current memory policy.
EAL: Setting policy MPOL_PREFERRED for socket 0
EAL: Restoring previous memory policy: 4
EAL: request: mp_malloc_sync
EAL: No shared files mode enabled, IPC is disabled
EAL: Heap on socket 0 was expanded by 514MB
IFACE: iface_event: iface event [0xacdc1001] ADD triggered for iface main.
IFACE: iface_event: iface event [0xacdc1002] POST_ADD triggered for 
iface main.
error: command failed: Operation not supported (EOPNOTSUPP)
IFACE: iface_event: iface event [0xacdc1006] STATUS_UP triggered for 
iface main.
EAL: Driver cannot attach the device (0000:04:00.0)
EAL: Failed to attach device on primary process
API: read_cb: pid=7479 id=3 req_type=0xacdc0001 (GR_IFACE_ADD) 
req_len=466 status=95 (Operation not supported) resp_len=0
API: disconnect_client: client pid=7479 disconnected
grout.service: Control process exited, code=exited, status=1/FAILURE
MAIN: signal_cb: received signal SIGTERM