[dpdk-dev] Vhost user no connection vm2vm

[Gaohaifeng (A)]

Hi
What kernel version are You using on host/guest?
>>I use ubuntu 12.04(3.11.0-15-generic) in host. In vm I use ubuntu 12.04 and ubuntu14.04 both, but the result is same.

Do you use some command I suggest before, In case of you miss the previous mail, just copy it again:
>> I try it but the result is same


I use l2fwd in vm to do more test and found that virtio_xmit_pkts is called and avail_idx is increasing in vm, but in host avail_idx(in rte_vhost_dequeue_burst function) is always zero. It seems that the host see the different mem area.

Init Logs below:
VHOST_CONFIG: (0) Mergeable RX buffers disabled
VHOST_CONFIG: read message VHOST_USER_SET_MEM_TABLE
VHOST_CONFIG: mapped region 0 fd:24 to 0x2aaaaac00000 sz:0xa0000 off:0x0
VHOST_CONFIG: REGION: 0 GPA: (nil) QEMU VA: 0x2aaaaac00000 SIZE (655360)
VHOST_CONFIG: mapped region 1 fd:26 to 0x2aaaaae00000 sz:0x40000000 off:0xc0000
VHOST_CONFIG: REGION: 1 GPA: 0xc0000 QEMU VA: 0x2aaaaacc0000 SIZE (1072955392)
VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
VHOST_CONFIG: (0) mapped address desc: 0x2aaae62f1000
VHOST_CONFIG: (0) mapped address avail: 0x2aaae62f2000
VHOST_CONFIG: (0) mapped address used: 0x2aaae62f3000
VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK
VHOST_CONFIG: vring kick idx:0 file:23
VHOST_CONFIG: virtio isn't ready for processing.
VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
VHOST_CONFIG: (0) mapped address desc: 0x2aaae62f4000
VHOST_CONFIG: (0) mapped address avail: 0x2aaae62f5000
VHOST_CONFIG: (0) mapped address used: 0x2aaae62f6000
VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK
VHOST_CONFIG: vring kick idx:1 file:28
VHOST_CONFIG: virtio is now ready for processing.


>Unfortunately not, I have the same issue in rte_vhost_dequeue_burst function.

>What kernel version are You using on host/guest? In my case on host I had 3.13.0 and on guests old 3.2 debian.

>I just looked deeper into virtio  back-end (vhost) but at first glace it seems like nothing coming from virtio.

>What I'm going to do today is to compile newest kernel for vhost and guest and debug where packet flow stuck, I will report the result

>On Thu, May 21, 2015 at 11:12 AM, Gaohaifeng (A) <gaohaifeng.gao at huawei.com<mailto:gaohaifeng.gao at huawei.com>> wrote:
>Hi Maciej
        >Did you solve your problem? I meet this problem as your case. And I found avail_idx(in rte_vhost_dequeue_burst function) is always zero although I do send packets in VM.

>Thanks.


> Hello, I have strange issue with example/vhost app.
>
> I had compiled DPDK to run a vhost example app with followed flags
>
> CONFIG_RTE_LIBRTE_VHOST=y
> CONFIG_RTE_LIBRTE_VHOST_USER=y
> CONFIG_RTE_LIBRTE_VHOST_DEBUG=n
>
> then I run vhost app based on documentation:
>
>  ./build/app/vhost-switch -c f -n 4  --huge-dir /mnt/huge --socket-mem
> 3712
> -- -p 0x1 --dev-basename usvhost --vm2vm 1 --stats 9
>
> -I use this strange --socket-mem 3712 because of physical limit of
> memoryon device -with this vhost user I run two KVM machines with
> followed parameters
>
> kvm -nographic -boot c -machine pc-i440fx-1.4,accel=kvm -name vm1 -cpu
> host -smp 2 -hda /home/ubuntu/qemu/debian_squeeze2_amd64.qcow2 -m
> 1024 -mem-path /mnt/huge -mem-prealloc -chardev
> socket,id=char1,path=/home/ubuntu/dpdk/examples/vhost/usvhost
> -netdev type=vhost-user,id=hostnet1,chardev=char1
> -device virtio-net
> pci,netdev=hostnet1,id=net1,csum=off,gso=off,guest_tso4=off,guest_tso6
> =
> off,guest_ecn=off
> -chardev
> socket,id=char2,path=/home/ubuntu/dpdk/examples/vhost/usvhost
> -netdev type=vhost-user,id=hostnet2,chardev=char2
> -device
> virtio-net-
> pci,netdev=hostnet2,id=net2,csum=off,gso=off,guest_tso4=off,guest_tso6
> =
> off,guest_ecn=off
>
> After running KVM virtio correctly starting (below logs from vhost app) ...
> VHOST_CONFIG: mapped region 0 fd:31 to 0x2aaabae00000 sz:0xa0000
> off:0x0
> VHOST_CONFIG: mapped region 1 fd:37 to 0x2aaabb000000 sz:0x10000000
> off:0xc0000
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK
> VHOST_CONFIG: vring kick idx:0 file:38
> VHOST_CONFIG: virtio isn't ready for processing.
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK
> VHOST_CONFIG: vring kick idx:1 file:39
> VHOST_CONFIG: virtio is now ready for processing.
> VHOST_DATA: (1) Device has been added to data core 2
>
> So everything looking good.
>
> Maybe it is something trivial but using options: --vm2vm 1 (or) 2
> --stats 9 it seems that I didn't have connection between VM2VM
> communication. I set manually IP for eth0 and eth1:
>
> on 1 VM
> ifconfig eth0 192.168.0.100 netmask 255.255.255.0 up ifconfig eth1
> 192.168.1.101 netmask 255.255.255.0 up
>
> on 2 VM
> ifconfig eth0 192.168.1.200 netmask 255.255.255.0 up ifconfig eth1
> 192.168.0.202 netmask 255.255.255.0 up
>
> I notice that in vhostapp are one directional rx/tx queue so I tryied
> to ping between VM1 to VM2 using both interfaces ping -I eth0
> 192.168.1.200 ping -I
> eth1 192.168.1.200 ping -I eth0 192.168.0.202 ping -I eth1
> 192.168.0.202
>
> on VM2 using tcpdump on both interfaces I didn't see any ICMP requests
> or traffic
>
> And I cant ping between any IP/interfaces, moreover stats show me that:
>
> Device statistics ====================================
> Statistics for device 0 ------------------------------
> TX total:               0
> TX dropped:             0
> TX successful:          0
> RX total:               0
> RX dropped:             0
> RX successful:          0
> Statistics for device 1 ------------------------------
> TX total:               0
> TX dropped:             0
> TX successful:          0
> RX total:               0
> RX dropped:             0
> RX successful:          0
> Statistics for device 2 ------------------------------
> TX total:               0
> TX dropped:             0
> TX successful:          0
> RX total:               0
> RX dropped:             0
> RX successful:          0
> Statistics for device 3 ------------------------------
> TX total:               0
> TX dropped:             0
> TX successful:          0
> RX total:               0
> RX dropped:             0
> RX successful:          0
> ======================================================
>
> So it seems like any packet didn't leave my VM.
> also arp table is empty on each VM.