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SR-IOV CNI plugin

If you do not know CNI. Please read here at first.

NIC with SR-IOV capabilities works by introducing the idea of physical functions (PFs) and virtual functions (VFs).

PF is used by host.Each VFs can be treated as a separate physical NIC and assigned to one container, and configured with separate MAC, VLAN and IP, etc.

Build

This plugin requires Go 1.5+ to build.

Go 1.5 users will need to set GO15VENDOREXPERIMENT=1 to get vendored dependencies. This flag is set by default in 1.6.

#./build

Enable SR-IOV

Given Intel ixgbe NIC on CentOS, Fedora or RHEL:

# vi /etc/modprobe.conf
options ixgbe max_vfs=8,8

Network configuration reference

  • name (string, required): the name of the network
  • type (string, required): "sriov"
  • master (string, required): name of the PF
  • ipam (dictionary, required): IPAM configuration to be used for this network.
  • pfOnly (bool, optional): skip VFs, only assign PF into container

Extra arguments

  • vf (int, optional): VF index. This plugin will allocate a free VF if not assigned
  • vlan (int, optional): VLAN ID for VF device
  • mac (string, optional): mac address for VF device

Usage

Given the following network configuration:

# cat > /etc/cni/net.d/10-mynet.conf <<EOF
{
    "name": "mynet",
    "type": "sriov",
    "master": "eth1",
    "ipam": {
        "type": "fixipam",
        "subnet": "10.55.206.0/26",
        "routes": [
            { "dst": "0.0.0.0/0" }
        ],
        "gateway": "10.55.206.1"
    }
}
EOF

Add container to network:

# CNI_PATH=`pwd`/bin
# cd scripts
# CNI_PATH=$CNI_PATH CNI_ARGS="IgnoreUnknown=1;IP=10.55.206.46;VF=1;MAC=66:d8:02:77:aa:aa" ./priv-net-run.sh ifconfig
contid=148e21a85bcc7aaf
netnspath=/var/run/netns/148e21a85bcc7aaf
eth0      Link encap:Ethernet  HWaddr 66:D8:02:77:AA:AA  
          inet addr:10.55.206.46  Bcast:0.0.0.0  Mask:255.255.255.192
          inet6 addr: fe80::64d8:2ff:fe77:aaaa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:558 (558.0 b)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

SRIOV VFs allow network SLAs. It's very useful. And sometimes, we also need to occupy the entire NIC, such as vFirewall. In this case, we can use pfOnly mode.

Create SRIOV network with PF mode. Please see following as reference:

# cat > /etc/cni/net.d/10-mynet.conf <<EOF
{
    "name": "mynet",
    "type": "sriov",
    "master": "eth1",
    "pfOnly": true,
    "ipam": {
        "type": "fixipam",
        "subnet": "10.55.206.0/26",
        "routes": [
            { "dst": "0.0.0.0/0" }
        ],
        "gateway": "10.55.206.1"
    }
}
EOF

Add container to network:

# CNI_PATH=`pwd`/bin
# cd scripts
# CNI_PATH=$CNI_PATH CNI_ARGS="IgnoreUnknown=1;IP=10.55.206.46" ./priv-net-run.sh ifconfig
contid=148e21a85bcc7aaf
netnspath=/var/run/netns/148e21a85bcc7aaf
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.55.206.46  netmask 255.255.255.192  broadcast 0.0.0.0
        inet6 fe80::215:5dff:fe38:101  prefixlen 64  scopeid 0x20<link>
        ether 00:15:5d:38:01:01  txqueuelen 1000  (Ethernet)
        RX packets 29  bytes 4960 (4.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11  bytes 1398 (1.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Remove container from network:

# CNI_PATH=$CNI_PATH ./exec-plugins.sh del $contid /var/run/netns/$contid

For example:

# CNI_PATH=$CNI_PATH ./exec-plugins.sh del 148e21a85bcc7aaf /var/run/netns/148e21a85bcc7aaf

More info.