![]() ![]() Unfortunatly DPDK doesn’t support “host rings” according to Īlso note in order to utilize NETMAP/PF_RING/DPDK you must modify, recompile or even redesign your application to match to the frameworks. First we modified netmap to leave queues that are not explicitly requested to be in netmap mode attached to the host stack. | Interceptor Application | | Normal Applications | | NIC Rings | | Host Ring +-+ Network Stack | #Netmap stack driver#| Netmap Enabled Network Interface Driver | The exclusive access to NIC is not a good feature always, consider the simple scenario when the NIC has to reply to ARP request. Therefore we can have the performance of direct packet capturing and take advantage of network stack services when we need them. In case of Netmap once userspace application exclusively acquired the NIC it is up to userspace application to decide which frames (if any) can be injected to the network stack. | Normal Applications | | Interceptor Application | Sockets to NIC Sockets to TAP TAP File Descriptor | Network Interface Driver | | TAP Interface | Only if a frame specifically is directed to the TAP interface the interceptor application can intercept frames. Userspace applications can still connect to physical interface. There’s no way to entirely bypass network stack in case of TAP interface. They don't by pass kernel but it's common to set TAP interface as the default interface in order to have a user space program to intercept applications traffic.Ĭonsider below diagram a typical interaction of an userspace program with network interface and network stack. TUN/TAP interfaces are virtual network interfaces in which instead of sending and receiving packets from physical media, sends and receives them from user space program. ![]()
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