On Wed, 25 Mar 2020 19:07:09 +0000 "Benoit Ganne (bganne)" <bga...@cisco.com> wrote:
> Hi all, > > We noticed a problematic behavior when using DPDK in Azure with Mellanox > CX4-Lx VFs on Ubuntu 18.04: the link status (link up or down) is never > updated - and so for an application trusting the link state reported by DPDK, > the link looks unavailable. > The root cause is mlx5_link_update_unlocked_gs() failing to get the link > speed from the Linux driver and always returning EAGAIN because of this test > at the end of the function: > > if (((dev_link.link_speed && !dev_link.link_status) || > (!dev_link.link_speed && dev_link.link_status))) > > Here, dev_link.link_status is correctly set but not dev_link.link_speed. > The Linux kernel driver does not seem to be able to get the link speed > because ethtool also fails to retrieve it from the kernel so the DPDK cannot > do any miracle here, but I wonder whether this should prevent to update the > other link status information to be correctly updated. > > Any thoughts? > > Thx > ben Is this with netvsc PMD or failsafe PMD?