[dpdk-dev] Vhost-cuse port problem

wenxu wenx05124561 at 163.com
Thu Aug 6 11:50:40 CEST 2015

Hi  all,

I build a ovs-dpdk and vhost-cuse POC through INSTALL.DPDK.md.

There is a br0 with dpdk0 and vhost-cuse-1
I build dpdk with 2.0.0 and ovs with master branch
# ovs-vsctl show
    Bridge "br0"
        Port "br0"
            Interface "br0"
                type: internal
        Port "vhost-cuse-1"
            Interface "vhost-cuse-1"
                type: dpdkvhostcuse

I setup a virtual machine succesfully. qemu compiled with master branch which is ok for vhost-cuse
qemu-system-x86_64 -smp 2 -m 1024 -hda ../ubuntu.img -vnc :1 -netdev tap,id=mynet1,script=no,downscript=no,ifname=vhost-cuse-1,vhost=on -device virtio-net-pci,mac=22:33:44:55:66:77,netdev=mynet1 -object memory-backend-file,id=mem,size=1024M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc

2015-08-06T09:37:55.780Z|00001|dpdk(vhost_thread2)|INFO|vHost Device 'vhost-cuse-1' (0) has been added
vhost device add sucessfully, guest os is ubuntu14.04 with kernel 3.16

I set the br0 and virtual machine eth0
But they can't ping each other

I find host packets can sent to virtual machine, virtual machine also send packet back to vhost-cuse, but it doesn't forward to ovs
There are rx_packets in vhost-cuse-1 port. But no packets counter in ovs flows.

So I debug ovs
if (OVS_UNLIKELY(dp_packet_size(packets[i]) < ETH_HEADER_LEN)) {

static inline uint32_t
dp_packet_size(const struct dp_packet *b)
    return b->mbuf.pkt_len;

ALL the packets size is 0, so the ovs drops the packets. Is there something wrong for vhost-cuse?

Xu Wen

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