About this task
Before you begin
Create a bridge named br0.
ovs-vsctl --if-exists del-br br0 ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
Add ports to the bridge.
ovs-vsctl add-port br0 dpdk0 -- set interface dpdk0 type=dpdk \ options:dpdk-devargs=class=eth,mac=<xx:xx:xx:xx:xx:xx> ovs-vsctl add-port br0 dpdk1 -- set interface dpdk1 type=dpdk \ options:dpdk-devargs=class=eth,mac=<xx:xx:xx:xx:xx:xx> ovs-vsctl add-port br0 dpdkvp0 -- set int dpdkvp0 type=dpdk \ options:"dpdk-devargs=0000:<XX:XX>.5,representor=" ovs-vsctl add-port br0 dpdkvp1 -- set int dpdkvp1 type=dpdk \ options:"dpdk-devargs=0000:<XX:XX>.6,representor="where:
XX:XX is the PCI bus ID, found with the command lspci | grep Napatech.
xx:xx:xx:xx:xx:xx is the MAC of the SmartNIC physical ports. Enter the command ntlog | grep mac to find the addresses of the physical ports.
- Ports with names of the form dpdk<n> refer to a physical port on the SmartNIC
- Ports with names of the form dpdkvp<n> refer to a virtual port used for attaching VMs
Display the bridge configuration for br0.
# ovs-ofctl show br0 OFPT_FEATURES_REPLY (xid=0x2): dpid:0000000de9068c34 n_tables:254, n_buffers:0 capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst 1(dpdk0): addr:00:0d:e9:06:8c:34 config: 0 state: 0 current: 1GB-FD speed: 1000 Mbps now, 0 Mbps max 2(dpdk1): addr:00:0d:e9:06:8c:35 config: 0 state: 0 current: 1GB-FD speed: 1000 Mbps now, 0 Mbps max 3(dpdkvp0): addr:00:00:00:00:00:00 config: 0 state: 0 speed: 0 Mbps now, 0 Mbps max 4(dpdkvp1): addr:00:00:00:00:00:00 config: 0 state: 0 speed: 0 Mbps now, 0 Mbps max LOCAL(br0): addr:00:0d:e9:06:8c:34 config: PORT_DOWN state: LINK_DOWN current: 10MB-FD COPPER speed: 10 Mbps now, 0 Mbps max OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
View the flow table entries for br0.
# ovs-ofctl dump-flows br0 cookie=0x0, duration=112.697s, table=0, n_packets=0, n_bytes=0, priority=0 actions=NORMAL
By default, the bridge is created with a flow rule which matches all traffic and has actions=NORMAL therefore the bridge will behave as an ordinary learning bridge.Note: When using the NORMAL rule, as with any bridged network, care should be taken to avoid creating bridge loops or broadcast storms. A potential loop is created, for example, if this same configuration is used on a second server, and the two ports of each SmartNIC are connected together. This creates a scenario where OVS receives a broadcast packet on dpdk0 and sends it back out on dpdk1, which is then received on dpdk1 of the downstream switch, which then sends the frame back out on its dpdk0, and so on indefinitely.