####TCP/IP stack for dpdk

Netdp is porting from FreeBSD TCP/IP stack, and provide a userspace TCP/IP stack for use with the Intel dpdk.

• librte_netdp: TCP/IP stack static library. netdp use dpdk mbuf, ring, memzone, mempool, timer, spinlock. so zero copy mbuf between dpdk and netdp.

• librte_netdpsock: Netdp socket lib for application, zero copy between netdp and application.

• netdp_cmd: Command for configure netdp tcp/ip stack.

• netdp_test: Example application with netdp for testing netdp tcp/ip stack

Support environment

• EAL is based on dpdk-2.1.0
• Development enviroment is based on x86_64-native-linuxapp-gcc
• TCP/IP stack is based on FreeBSD 10.0-RELEASE
• linux version： 3.16.0-30-generic
• gcc version： gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)

Support feature:

• Netdp initialize
• Ether, zero copy between NIC and netdp TCP/IP stack.
• ARP, ARP timeout
• IP layer, IP fragmentation and reassemble
• Routing
• ICMP
• Commands for adding, deleting, showing IP address
• Commands for adding, deleting, showing static route
• Commands for showing ARP table
• UDP protocol
• Socket layer, share memory.
• Socket API, socket/close/send/recv/epoll.
• TCP protocol, no lock, hash table, per tcp stack per lcore.(currently only run in one lcore, will enhance it)

Next Planning

• Enhance TCP Flow control and Congestion control
• TCP RSS
• Performance testing.
• IPFW

####Wiki Page

You can get more information and instructions from wiki page.

####Performance Testing

• TCP server performance testing

ENV: CPU- intel xeon 2.3G, NIC- 10G, Test tool:ab

Procedure: ab establish tcp connection to netdp tcp server, ab download one data, netdp tcp server close socket.

Command: ab -n 1000000 -c 500 2.2.2.2:8089/

    |--------------------------------------| 
    |      TCP Server accept performance   |
    |--------------------------------------| 
    | Linux with epoll | NETDP with epoll  | 
    |    (Multi core)  |    (one core)     |
    |--------------------------------------|
    | 53k connection/s | 43k connection/s  | 
    |--------------------------------------| 

• L3 forwarding performance testing

  ENV: CPU- intel xeon 2.3G, NIC- 10G, one lcore rx packets-->l3 forwarding --> tx packets, Test tool:pktgen-DPDK

    |--------------------------------------| 
    |      L3 forwarding performance       |
    |             (one lcore)              |
    |--------------------------------------| 
    | Packet size(byte)| Throughput(Mpps)  | 
    |--------------------------------------|
    |     64           |      3.682        | 
    |--------------------------------------| 
    |     128          |      3.682        | 
    |--------------------------------------| 
    |     256          |      3.683        | 
    |--------------------------------------| 
    |     512          |      2.35         |
    |--------------------------------------| 
    |     1024         |      1.197        | 
    |--------------------------------------| 
    |     1500         |      0.822        | 
    |--------------------------------------| 

####Notes

• Netdp socket application run as a secondary dpdk process, If you got below log, shall execute below commands to disable ASLR.

EAL: WARNING: Address Space Layout Randomization (ASLR) is enabled in the kernel.
EAL: This may cause issues with mapping memory into secondary processes
$ sudo sysctl -w kernel.randomize_va_space=0

####Support

BSD LICENSE, you may use netdp freely.

For free support, please use netdp team mail list at zimeiw@163.com. or QQ Group:86883521