On Wed, Jan 1, 2020 at 5:05 PM Yi Yang (杨燚)-云服务集团 <yangy...@inspur.com> wrote: > > William, use the below option for your tap0 > > sudo ovs-vsctl add-port br-int virtio_user0 -- set Interface virtio_user0 > type=dpdk > options:dpdk-devargs=net_virtio_user0,iface=tap0,path=/dev/vhost-net,queue_size=1024 > > vistio_user also can create tap0 if it doesn't exist, you remove "iface=tap0" > from option for that case. > > Maybe ovs port name can't be same as tap interface names, it is just my guess. >
Hi Yi, Thanks for your reply. I'm using this ovs command ovs-vsctl add-port br0 virtio_user0 -- set Interface virtio_user0 type=dpdk \ options:n_rxq=1 options:n_txq=1 \ options:dpdk-devargs=net_virtio_user0,iface=tap0,path=/dev/vhost-net,queues=1 I hit an error showing 00051|netdev_dpdk|INFO|Device 'net_virtio_user0,iface=tap0,path=/dev/vhost-net, queues=1' attached to DPDK |00058|netdev_dpdk|DBG|Port virtio_user0: Requesting a mempool of 262144 mbufs of size 2176 on socket 0 for 1 Rx and 2 Tx queues, cache line size of 64 00060|netdev_dpdk|WARN|Rx checksum offload is not supported on port 0 00061|dpdk|ERR|virtio_dev_configure(): Unsupported Rx multi queue mode 1 00062|dpdk|ERR|Port0 dev_configure = -22 00063|netdev_dpdk|WARN|Interface virtio_user0 eth_dev setup error Invalid argument 00064|netdev_dpdk|ERR|Interface virtio_user0(rxq:1 txq:1 lsc interrupt mode:false) configure error: Invalid argument The "Unsupported Rx multi queue mode 1" at virtio_dev_configure() if (rxmode->mq_mode != ETH_MQ_RX_NONE) { PMD_DRV_LOG(ERR, "Unsupported Rx multi queue mode %d", rxmode->mq_mode); // return -EINVAL; } Based on DPDK master commit 2e088e6f94b773233c06440763c1be43d0d705b3 Skipping it seems to work, but I don't understand how to set virtio_user to disable mq_mode in virtio_dev. For virtio user, there are these parameters: RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user, "path=<path> " "mac=<mac addr> " "cq=<int> " "queue_size=<int> " "queues=<int> " "iface=<string> " "server=<0|1> " "mrg_rxbuf=<0|1> " "in_order=<0|1> " "packed_vq=<0|1>"); Thanks William > -----邮件原件----- > 发件人: dev [mailto:dev-boun...@dpdk.org] 代表 William Tu > 发送时间: 2020年1月1日 6:19 > 收件人: <d...@openvswitch.org> <d...@openvswitch.org>; dev@dpdk.org > 抄送: Jianfeng Tan <jianfeng....@linux.alibaba.com> > 主题: [dpdk.org代发][dpdk-dev] Question about using virtio_user in OVS-DPDK > > Hi, > > I'm trying to find a faster way to communicate from userspace OVS to kernel. > So I create a virtio_user port at OVS-DPDK, and send packets to kernel's tap > device. > > packets in OVS userspace -> virtio-user port -> vhost-net (kernel) -> tap > device (kernel) As described in paper[1], figure 1 for legacy applications. > > But there is no documentation about it. I tried: > 1) load vhost-net > # lsmod | grep vhost > vhost_net 32768 0 > vhost 57344 1 vhost_net > tap 28672 1 vhost_net > tun 57344 8 vhost_net > > 2) start OVS > 3) create tap and attach to OVS > ip tuntap add mode tap tap0 > ip link set dev tap0 up > ovs-vsctl add-port br0 tap0 -- set interface tap0 type=dpdk \ > options:dpdk-devargs=vdev:net_virtio_user1,iface=tap0,path=/dev/vhost-net > > So I thought this is a faster channel using virtio ring than readv/writev to > the tap fd. > But it doesn't work. > 2019-12-31T22:06:39.956Z|00033|netdev|WARN|could not create netdev > tap0 of unknown type dpdk > 2019-12-31T22:06:39.956Z|00034|bridge|WARN|could not open network device tap0 > (Address family not supported by protocol) > > Any suggestions? Or do I understand the concept of virtio_user correctly? > > [1] VIRTIO-USER: A New Versatile Channel for Kernel-Bypass Networks Thanks > William