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From: Mark McConnaughay <mcconnma@gmail.com>
Date: Tue, 27 Mar 2018 15:43:10 -0400
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Subject: [dpdk-users] How to set fixed link speed on i40e port?
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Hi,


I am trying to set the speed on an i40e port to 1G that only supports 1G to
10G.

However, after stopping, configuring and starting the port, it always
auto-negotiates with the upstream switch to the higher rate (10G).

I tried this to disable auto-negotiation and set a fixed speed:



rte_eth_config.link_speeds =3D ETH_LINK_SPEED_FIXED | ETH_LINK_SPEED_1G;


However, I received the following error:


i40e_dev_start(): Invalid link_speeds for port 0; autonegotiation disabled


I was able to set it to 1G via the kernel driver by disable auto-neg as
such:



# ethtool -s nic2_0 autoneg off advertise 0x020



It=E2=80=99s not clear how to do this with the DPDK API.

Any thoughts, guidance appreciated.



Thanks,