Intel igc driver - IXDP/libxdp packet processing
 
 

Intel igc driver - IXDP/libxdp packet processing

February 14, 2025
configuration
IXDP, libxdp, driver

Overview #

Linux 5.4 kernel driver for Intel(R) I225-LM/I225-V 2.5G Ethernet Controller

Machine and kernel version # 

root@d33:~# hostnamectl
 Static hostname: d33
       Icon name: computer-desktop
         Chassis: desktop 🖥️
      Machine ID: c2ce1f4de9054bf69e9c0a317b8d95d1
         Boot ID: d77fbc41d6844e67af14c3814b0eb94e
Operating System: Debian GNU/Linux 12 (bookworm)  
          Kernel: Linux 6.1.0-31-amd64
    Architecture: x86-64
 Hardware Vendor: Thomas-Krenn.AG
  Hardware Model: LES v4
Firmware Version: 5.19
root@d33:~#

Intel Corporation Ethernet Controller I226-V # 

root@d33:~# lspci | egrep 226
01:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-V (rev 04)
02:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-V (rev 04)
03:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-V (rev 04)
root@d33:~#

igc driver and version # 

root@d33:~# ethtool -i enp1s0
driver: igc
version: 6.1.0-31-amd64
firmware-version: 2017:888d
expansion-rom-version:
bus-info: 0000:01:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
root@d33:~#

igc channel parameters # 

root@d33:~# ethtool -l enp1s0
Channel parameters for enp1s0:
Pre-set maximums:
RX:		n/a
TX:		n/a
Other:		1
Combined:	4
Current hardware settings:
RX:		n/a
TX:		n/a
Other:		1
Combined:	4
root@d33:~#

igc ring parameters # 

root@d33:~# ethtool -g enp1s0
Ring parameters for enp1s0:
Pre-set maximums:
RX:		4096
RX Mini:	n/a
RX Jumbo:	n/a
TX:		4096
Current hardware settings:
RX:		256
RX Mini:	n/a
RX Jumbo:	n/a
TX:		256
RX Buf Len:		n/a
CQE Size:		n/a
TX Push:	off
TCP data split:	n/a
root@d33:~#

Summary #

  • version 6.1.0-31-amd64 requires SKB mode
  • zero-copy support with igc is already available with upfront Linux kernels
  • one queue/thread is perfect to fully saturate 2.5Bbit bridging
  • the default RX/TX ring size of 4096 works