title: DPDK run testpmd failed. EAL:no probed ethernet device
body: <p>I'm new to dpdk and using dpdk-stable-17.11.2 on docker.
  OS is Ubuntu 14.04 and the kernel is 3.19.0-80-generic.
  I've followed the dpdk-setup.sh as below and bind the igb_uio driver to my device.</p>
  
  <pre><code>[14] x86_64-native-linuxapp-gcc
  [17] Insert IGB UIO module
  [18] Insert VFIO module
  [19] Insert KNI module
  [20] Setup hugepage mappings for non-NUMA systems
  [21] Setup hugepage mappings for NUMA systems
  [22] Display current Ethernet/Crypto device settings
  [23] Bind Ethernet/Crypto device to IGB UIO module
  [24] Bind Ethernet/Crypto device to VFIO module
  [25] Setup VFIO permissions
  </code></pre>
  
  <hr>
  
  <pre><code>Network devices using DPDK-compatible driver
  ============================================
  0000:03:00.1 'NetXtreme II BCM57810 10 Gigabit Ethernet 168e' drv=igb_uio unused=vfio-pci
  
  Network devices using kernel driver
  ===================================
  0000:03:00.0 'NetXtreme II BCM57810 10 Gigabit Ethernet 168e' if=eth1 drv=bnx2x unused=igb_uio,vfio-pci *Active*
  0000:04:00.0 'NetXtreme BCM5751 Gigabit Ethernet PCI Express 1677' if=eth0 drv=tg3 unused=igb_uio,vfio-pci *Active*
  0000:07:00.0 'NX3031 Multifunction 1/10-Gigabit Server Adapter 0100' if=eth3 drv=netxen_nic unused=igb_uio,vfio-pci
  0000:07:00.1 'NX3031 Multifunction 1/10-Gigabit Server Adapter 0100' if=eth4 drv=netxen_nic unused=igb_uio,vfio-pci
  </code></pre>
  
  <hr>
  
  <p>I got errors when running testpmd.</p>
  
  <pre><code>EAL: Detected 32 lcore(s)
  EAL: Probing VFIO support...
  EAL: VFIO support initialized
  EAL: No probed ethernet devices
  PANIC in main():
  Empty set of forwarding logical cores - check the core mask supplied in the command parameters
  5: [x86_64-native-linuxapp-gcc/app/testpmd() [0x46504f]]
  4: [/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fe9117c9f45]]
  3: [x86_64-native-linuxapp-gcc/app/testpmd(main+0x8fb) [0x460aab]]
  2: [x86_64-native-linuxapp-gcc/app/testpmd(__rte_panic+0xb8) [0x458a7a]]
  1: [x86_64-native-linuxapp-gcc/app/testpmd(rte_dump_stack+0x1a) [0x4ea2aa]]
  </code></pre>
  
  <p>What have I missed?</p>