giuliomoro Thanks for reply,
root@bela ~$ dmesg | grep gadget
[ 15.420075] gadget: using random self ethernet address
[ 15.442690] gadget: Mass Storage Function, version: 2009/09/11
[ 15.448918] gadget: Number of LUNs=1
[ 15.458249] gadget: Multifunction Composite Gadget
[ 15.463371] gadget: g_multi ready
root@bela ~$ ifconfig usb0
usb0 Link encap:Ethernet HWaddr f6:66:24:34:fd:6b
inet addr:192.168.7.2 Bcast:192.168.7.3 Mask:255.255.255.252
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 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:0 (0.0 B) TX bytes:0 (0.0 B)
and dmesg after ifconfig usb0 up
[ 1302.463633] usb usb1: usb auto-resume
[ 1302.463660] hub 1-0:1.0: hub_resume
[ 1302.463750] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000
[ 1302.478547] hub 1-0:1.0: hub_suspend
[ 1302.478584] usb usb1: bus auto-suspend, wakeup 1
[ 1302.478944] usb usb2: usb auto-resume
[ 1302.478962] hub 2-0:1.0: hub_resume
[ 1302.479065] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0000
[ 1302.488451] hub 2-0:1.0: hub_suspend
[ 1302.488484] usb usb2: bus auto-suspend, wakeup 1