Hi, All I'm using Open vSwitch together with NOX, and have one problem when adding one netdev into datapath manually. Following is my procedure: 1. NOX and Open vSwitch are started and they setup connection successfully; 2. I start one VM and use ovs-dpctl to add the tap interface into datapath; 3. I tried to send out packets in the VM using ping;
The problem is that no packet_in event is sent to NOX. Then I checked the statistics of VM's tap interface(also use ovs-dpctl), it shows all packets received on the tap interface are lost. I tried to dig the code (latest development branch) and found the root cause is there is no upcall_pid (netlink) for the vport. Also I found that netlink pid is maintained by ovs-vswitchd and passed to vport through set_config method. So my understanding is only ovs-vswitchd can add interface to datapath if we want to configure open vswitch as openflow switch, because ovs-dpctl process could not get netlink pid information from ovs-vswitchd process. Is it right? If it is right, how to add netdev interface to datapath if open vswitch is configured as openflow switch? Thanks for your help! Thanks, Lyon
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