Thank you very much. Following your guide, I've successfully got this
system working. :-)
在 2016/1/9 11:59, Mauricio Vásquez 写道:
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.
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On 7 January 2016 at 06:16, Furong <wbaha...@126.com
<mailto: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!!
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