Hello Furong, Unfortunately it is not well documented, I'm going to explain what you need to start:
- The ivshmem mechanism of DPDK does not work with a standard version of QEMU, then you need a patched version. It could be found at the dpdk-ovs project: https://github.com/01org/dpdk-ovs. You can find information about how to compile it in the QEMU website. - The dpdkr ports are composed of a pair of DPDK rte_rings, these rings have to be shared to the VM using the IVSHMEM mechanism, it requires to create a metadata file and pass it as argument to QEMU. There is not a standard tool for creating this metadatafile, we developed a tool for doing it: https://github.com/netgroup-polito/un-orchestrator/blob/master/orchestrator/compute_controller/plugins/kvm-libvirt/cmdline_generator/cmdline_generator.c, it is not documented but the code is very simple. You can build your own using the dpdk ivshmem library if you want. - In the guest operating system you have to install DPDK and enable the huge pages. I propose to try this configuration https://github.com/01org/dpdk-ovs/blob/development/docs/04_Sample_Configurations/01_IVSHM.md but using ovs-dpdk, the steps are the following: Once ovs is running: 1. Create a switch ovs-vsctl --no-wait add-br br0 -- set bridge br0 datapath_type=netdev 2. add physicals ports to the switch ovs-vsctl --no-wait add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk ofport_request=1 ovs-vsctl --no-wait add-port br0 dpdk1 -- set Interface dpdk1 type=dpdk ofport_request=2 3. add a dpdkr port to connect to the VM ovs-vsctl --no-wait add-port br0 dpdkr1 -- set Interface dpdkr1 type=dpdkr ofport_request=3 4. create the flows .... 5. create the metadata file Using our tool: ./cmdline_generator -m -p dpdkr1 It will generate a file with the command line to be added to qemu. 6. launch qemu with the command line generated in step 5. 7. Inside the VM compile and run the https://github.com/openvswitch/ovs/blob/master/tests/dpdk/ring_client.c program ./ring_client -c 1 -n 4 -- -n 1 If everything goes well, the system will be forward all the traffic that receives in the interface dpdk0 to the interface dpdk1. On 7 January 2016 at 06:16, Furong <wbaha...@126.com> wrote: > Hello everybody: > I am trying to use IVSHM to exchange packets between VMs. > On OVS side, I know the IVSHM channel is built upon the ring > devices from DPDK. However, I do not know how to setup qemu > to share this ring device's memory to VMs. > > Could somebody give a short tutorial? Thanks!! > > _______________________________________________ > dev mailing list > dev@openvswitch.org > http://openvswitch.org/mailman/listinfo/dev > _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
