I am trying to passthrough Mellanox-5 to qemu by following this article. ESPCommunity (I use RoCE)
I have confirmed that the network interface exists, the drivers are installed, and I can see the network device, but I am unable to activate the interface.
lspci -D | grep Mella
0000:04:00.0 Ethernet controller: Mellanox Technologies MT27800 Family [ConnectX-5 Virtual Function]
lsmod | grep mlx5
mlx5_ib 413696 0
mlx5_core 1843200 1 mlx5_ib
pci_hyperv_intf 16384 1 mlx5_core
mlxdevm 172032 1 mlx5_core
auxiliary 16384 2 mlx5_ib,mlx5_core
ib_uverbs 147456 2 rdma_ucm,mlx5_ib
ib_core 331776 8 rdma_cm,ib_ipoib,iw_cm,ib_umad,rdma_ucm,ib_uverbs,mlx5_ib,ib_cm
mlx_compat 65536 12 rdma_cm,ib_ipoib,mlxdevm,iw_cm,auxiliary,ib_umad,ib_core,rdma_ucm,ib_uverbs,mlx5_ib,ib_cm,mlx5_core
tls 73728 1 mlx5_core
mlxfw 32768 1 mlx5_core
psample 20480 1 mlx5_core
ip addr show enp4s0np0
5: enp4s0np0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 00:22:33:44:53:01 brd ff:ff:ff:ff:ff:ff
inet 192.168.202.53/20 brd 192.168.207.255 scope global enp4s0np0
valid_lft forever preferred_lft forever
Whenever I try to activate the interface, there is no error output, but the status remains Down.
I checked the /var/log/syslog and it says
Nov 1 12:10:57 vm1 systemd-networkd[621]: enp4s0np0: Link DOWN
Nov 1 12:10:59 vm1 systemd-networkd[621]: enp4s0np0: Link UP
Nov 1 12:10:59 vm1 kernel: [ 2485.158993] mlx5_core 0000:04:00.0 enp4s0np0: Link down
It seems when I set it to up and suddenly it’s set to down.
How can I fix it? Appreciate for help.