Support for Forcing Speed/Duplex/Autoneg on i225 with DPDK igc Driver

[Renata Saiakhova]

Hi all,
I'm trying to configure Layer 1 attributes (speed, duplex, and autonegotiation) for Intel i225 interfaces in both kernel and DPDK modes, and I've run into some issues.
In kernel driver mode, I normally use: "ethtool -s eth5 speed 100 duplex half autoneg off".
However, this results in the kernel message: "igc 0000:04:00.0 eth5: Force mode currently not supported".

When the interface is bound to DPDK and connected to an OVS bridge, I configure it like this:
ovs-vsctl set Interface 1.extra2 \
  type=dpdk \
  options:dpdk-devargs=0000:04:00.0 \
  options:dpdk-speed=100 \
  options:dpdk-autoneg=false \
  options:dpdk-duplex=half
This should pass the speed/autoneg/duplex settings to the igc DPDK driver via devargs.
However, it appears these options are not applied - the interface continues to negotiate its settings as usual, and I can't find any code in the igc DPDK driver that processes these devargs parameters.
Is support for forced speed/duplex/autoneg available at all for i225 in DPDK (or even kernel) mode? Or is this a hardware limitation?
Any insight, documentation pointers, or confirmation of support status especially in case of DPDK mode would be greatly appreciated.
Best regards,


Renata Saiakhova
SW ARCHITECT
renata.saiakhova at ekinops.com<mailto:renata.saiakhova at ekinops.com%20>
Tel: +32 16 799 970
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