Hi, I had posted the following to the users mailing list a couple of days ago, but there was no answer. My question contains references to the DPDK source code, so I probably will not break the rules by sending a copy to the dev mailing list.
Begin forwarded message: Date: Thu, 2 Jun 2016 10:43:23 +0700 From: Ruslan Osmanov <rrosma...@gmail.com> To: users at dpdk.org Subject: Using KNI with virtio-net-pci 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? -- Ruslan Osmanov -- Ruslan Osmanov
