[dpdk-users] new_device is never created at the vhost-switch sample app

edgar helmut helmut.edgar100 at gmail.com
Thu Dec 15 07:40:01 CET 2016


Thanks Gowrishankar

Using thevtestpmd resulted with the same behavior.
However it was solved after getting and building the latest qemu with
softmmu flag. Then it started to function.
Until then I was using the qemu as installed on my machine using the
default package configuration (using apt install...).

Thanks


On 05 Dec 2016 7:27 PM, "gowrishankar muthukrishnan" <
gowrishankar.m at linux.vnet.ibm.com> wrote:

On Friday 25 November 2016 01:28 PM, edgar helmut wrote:

> Hi,
> I am following http://dpdk.org/doc/guides/sample_app_ug/vhost.html using
> 16.11 in order to have a simple VM forwarding packets from one NIC to
> another efficiently, but it doesn't work... so I need some help to
> understand what am i missing.
> I am using x520 (intel 82599).
> host is ubuntu 16.04 and dpdk 16.11.
>
> my steps at host:
> 1. enabling VHOST defines and building x86_64-native-linuxapp-gcc.
>
> 2. both interfaces are bind like:
> 0000:04:00.0 'Ethernet 10G 2P X520 Adapter' drv=igb_uio unused=ixgbe
> 0000:04:00.1 'Ethernet 10G 2P X520 Adapter' drv=igb_uio unused=ixgbe
>
> 3. then making the project examples/vhost and executing:
> ./build/vhost-switch -c 0x03 -n 4 --socket-mem 1024 --file-prefix p1  -- -p
> 1 --vm2vm 0 --socket-file /tmp/sock1 --client -P
> ./build/vhost-switch -c 0x30 -n 4 --socket-mem 1024 --file-prefix p2  -- -p
> 2 --vm2vm 0 --socket-file /tmp/sock2 --client -P
>
> 4. creating the guest
> qemu- system-x86_64 -chardev socket,id=char1,path=/tmp/sock1,server
> -netdev
> type=vhost-user,id=hostnet1,chardev=char1,queues=2 -device
> virtio-net-pci,mq=on,vectors=2,netdev=hostnet1,id=net1,mac=0
> 0:00:00:00:00:01
> -chardev socket,id=char2,path=/tmp/sock2,server -netdev
> type=vhost-user,id=hostnet2,chardev=char2,queues=2 -device
> virtio-net-pci,mq=on,vectors=2,netdev=hostnet2,id=net2,mac=0
> 0:00:00:00:00:02
> -object
> memory-backend-file,id=mem2,size=2048M,mem-path=/run/hugepages,share=on
> ...
>
> my steps on the guest:
> 1. enabling VHOST defines and building x86_64-native-linuxapp-gcc.
>
> 2. successfully setting up environment:
> modprobe uio_pci_generic
> ./tools/dpdk-devbind.py -b uio_pci_generic 0000:00:07.0
> ./tools/dpdk-devbind.py -b uio_pci_generic 0000:00:08.0
> ./examples/l3fwd/build/l3fwd -c 0x3 -n 3 -- --parse-ptype -p 0x3 -P -L
> --config="(0,0,0),(0,1,1),(1,0,0),(1,1,1)" --no-numa
> it looks like the l3fwd app initialized successfully but it receives no
> traffic.
>
How about simple io forward through testpmd here (testpmd -c 0x3 -n 3 --
-portmask=0x3)  ?
Are you ending up traffic not seen for this case as well ? (Just to
eliminate cases with l3fwd).

Thanks,
Gowrishankar


> I see at the host that connection is made however no traffic arrives to the
> host.
> digging into the code i see that the message VHOST_USER_SET_VRING_KICK
> never arrives to the host hence the callback new_device is never called and
> I can't figure out why.
>
> Any ideas?
>
> Thanks,
> Edgar
>
>
>


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