gistfile1.txt

Two machines with 10G NIC directly connect each other
nn22 and nn23

step 1: create one VF on nn23 
echo 1 > /sys/bus/pci/devices/0000:07:00.0/sriov_numvfs

Before bind VF to vfid-pci, try to ping this VF from nn22 (IP 12.0.0.22)
zhangwei1984@nimbnode23:~/bifurcation/dpdk-17.02$ sudo ./usertools/dpdk-devbind.py --status

Network devices using DPDK-compatible driver
============================================
<none>

Network devices using kernel driver
===================================
0000:05:00.0 '82576 Gigabit Network Connection' if=em1 drv=igb unused=igb_uio,vfio-pci *Active*
0000:05:00.1 '82576 Gigabit Network Connection' if=em2 drv=igb unused=igb_uio,vfio-pci 
0000:07:00.0 '82599ES 10-Gigabit SFI/SFP+ Network Connection' if=p2p1 drv=ixgbe unused=igb_uio,vfio-pci 
0000:07:00.1 '82599ES 10-Gigabit SFI/SFP+ Network Connection' if=p2p2 drv=ixgbe unused=igb_uio,vfio-pci 
0000:07:10.0 '82599 Ethernet Controller Virtual Function' if=p2p1_0 drv=ixgbevf unused=igb_uio,vfio-pci *Active*
0000:07:10.1 '82599 Ethernet Controller Virtual Function' if=p2p2_0 drv=ixgbevf unused=igb_uio,vfio-pci 


step 2:  assign IP to this VF p2p1_0 12.0.0.23

p2p1      Link encap:Ethernet  HWaddr 90:e2:ba:4a:e8:08  
          inet6 addr: fe80::92e2:baff:fe4a:e808/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1847 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:111124 (111.1 KB)  TX bytes:0 (0.0 B)

p2p1_0    Link encap:Ethernet  HWaddr 2a:6b:c5:99:c1:e7  
          inet addr:12.0.0.23  Bcast:12.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::286b:c5ff:fe99:c1e7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1836 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1844 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:110160 (110.1 KB)  TX bytes:77760 (77.7 KB)

From the tcpdump -i p2p1_0, it gave the reply. 
tcpdump output for p2p1_0 
19:32:26.495373 ARP, Request who-has 12.0.0.23 tell 12.0.0.22, length 46
19:32:26.495386 ARP, Reply 12.0.0.23 is-at 2a:6b:c5:99:c1:e7 (oui Unknown), length 28
19:32:27.493077 ARP, Request who-has 12.0.0.23 tell 12.0.0.22, length 46
19:32:27.493098 ARP, Reply 12.0.0.23 is-at 2a:6b:c5:99:c1:e7 (oui Unknown), length 28

Also ifconfig counter increases. It seems that the arp reply should be sent out.  
But nn22 does not receive the packets. ifconfig drop counter is 0. 

If using ethtool checks the counter, tx counter is 0. 
NIC statistics:
     rx_packets: 29
     tx_packets: 0
     rx_bytes: 1740
     tx_bytes: 0
     tx_busy: 0
     tx_restart_queue: 0
     tx_timeout_count: 1
     multicast: 0
     rx_csum_offload_errors: 0
     rx_bp_poll_yield: 0
     rx_bp_cleaned: 0
     rx_bp_misses: 0
     tx_bp_napi_yield: 0
     tx_bp_cleaned: 0
     tx_bp_misses: 0

     
  why ifconfig and ethtool does not match each other. ifconfig shows tx increases. 
  but ethtool shows tx is 0. p2p1 tx is also 0 from ethtool stats. 
  
  Do you have any idea how to debug this problem?