Kernel errors releated to infiniband

A cursory search for infiniband bnxt_re0: Couldn't start port reveals [0], which suggests:

  1. Update the firmware of your NIC.
    2a. Disable the RDMA feature (if you don’t need it) on your NIC itself (enabled by default, you need to install the niccli tool).
    niccli -i 1 nvm -setoption support_rdma -scope 0 -value 0
    niccli -i 1 reset
    

2b. Disable loading the RDMA driver (if you don’t need it).

echo "blacklist bnxt_re" >> /etc/modprobe.d/blacklist-bnxt_re.conf
update-initramfs -u

[0] Network interfaces down on reboot | Proxmox Support Forum