[dpdk-users] Using KNI with virtio-net-pci

Ferruh Yigit ferruh.yigit at intel.com
Mon Jun 27 21:48:32 CEST 2016


On 6/2/2016 4:43 AM, Ruslan Osmanov wrote:
> Hi,
> 
> I'm going to develop a DPDK application on a laptop, but the laptop's
> hardware is not supported by DPDK. Furtunately, DPDK supports
> paravirtualized devices(http://www.dpdk.org/doc/nics) including
> virtio-net.  
> 
> So I'm trying to configure a QEMU guest for running the Kernel NIC
> Interface(KNI) on a virtio-net-pci device. The problem is that the KNI
> sample application doesn't accept the virtio-pci driver.
> 
> 
> QEMU command:
> 
> eth_device=virtio-net-pci
> exec qemu-system-x86_64 -enable-kvm \
>   -cpu host -smp 2 \
>   -vga std \
>   -mem-prealloc -mem-path /dev/hugepages \
>   -drive file=GentooVM.img,if=virtio \
>   -netdev user,id=vmnic,hostname=gentoo \
>   -device $eth_device,netdev=vmnic \
>   -m 1024M \
>   -monitor stdio \
>   -name "Gentoo VM"
> 
> Running the KNI sample application in the guest:
> 
> sudo ./examples/kni/build/app/kni -c 0x3 -n 4 -- \
> -P -p 0x1 --config="(0,0,1)"
> 
> EAL: Detected lcore 0 as core 0 on socket 0
> EAL: Detected lcore 1 as core 0 on socket 0
> EAL: Support maximum 128 logical core(s) by configuration.
> EAL: Detected 2 lcore(s)
> EAL: Probing VFIO support...
> EAL:   IOMMU type 1 (Type 1) is supported
> EAL:   IOMMU type 8 (No-IOMMU) is not supported
> EAL: VFIO support initialized
> EAL: Setting up physically contiguous memory...
> ...
> EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using
> unreliable clock cycles !
> EAL: Master lcore 0 is ready (tid=657d58c0;cpuset=[0])
> PMD: rte_igbvf_pmd_init():  >>
> EAL: lcore 1 is ready (tid=305ff700;cpuset=[1])
> EAL: PCI device 0000:00:03.0 on NUMA socket -1
> EAL:   probe driver: 1af4:1000 rte_virtio_pmd
> EAL:   Not managed by a supported kernel driver(0), skipped
> PMD: virtio_read_caps(): failed to map pci device!
> PMD: vtpci_init(): trying with legacy virtio pci.
> Segmentation fault
> 
> $ lspci
> ...
> 00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
> 
> I've noticed that pci_scan_one() function sets dev->kdrv =
> RTE_KDRV_NONE in lib/librte_eal/linuxapp/eal/eal_pci.c, while the
> driver is detected as virtio-pci
> (from /sys/bus/pci/devices/0000:00:03.0/driver).
> 
> Is it even possible to run KNI with virtio-net-pci device?
> 
> If it's impossible, then are there other options?
> 

Hi Ruslan,

I tried with same QEMU command with you and able to run KNI sample
application. I am using dpdk on latest master branch.

A few questions:

> EAL: PCI device 0000:00:03.0 on NUMA socket -1
> EAL:   probe driver: 1af4:1000 rte_virtio_pmd
> EAL:   Not managed by a supported kernel driver(0), skipped
1)
According above log, device not bind to a supported driver, this looks
like your problem. Can you please send output of:
dpdk_nic_bind.py -s

2)
Can you run testpmd? Or problem is just KNI?

3)
Are you using dpdk16.04?

Regards,
ferruh


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