usb挂载网口设备问题

[ 4.042909] ehci_hcd: USB 2.0 ‘Enhanced’ Host Controller (EHCI)
Driver [ 4.057210] ohci_hcd: USB 1.1 ‘Open’ Host Controller (OHCI)
Driver [ 4.063529] ambarella-ohci 60019000.ohci: Ambarella OHCI [
4.068832] ambarella-ohci 60019000.ohci: new USB bus registered, assigned bus number 1 [ 4.076889] ambarella-ohci 60019000.ohci: irq
89, io mem 0x60019000 [ 4.146160] usb usb1: New USB device found,
idVendor=1d6b, idProduct=0001 [ 4.152940] usb usb1: New USB device
strings: Mfr=3, Product=2, SerialNumber=1 [ 4.160136] usb usb1:
Product: Ambarella OHCI [ 4.164481] usb usb1: Manufacturer: Linux
3.10.73 ohci_hcd [ 4.169941] usb usb1: SerialNumber: AmbUSB [ 4.174544] hub 1-0:1.0: USB hub found [ 4.178282] hub 1-0:1.0: 1 port detected [ 4.191542] ambarella-udc 60006000.udc:
ambarella_udc: version 12 August 2015 [ 4.217597] ehci-ambarella:
AMBARELLA-EHCI Host Controller driver [ 4.223800] ambarella-ehci
60018000.ehci: EHCI Host Controller [ 4.229627] ambarella-ehci 60018000.ehci: new USB bus registered, assigned bus number 2 [ 4.237745] ambarella-ehci 60018000.ehci: irq 73, io mem 0x60018000 [ 4.262120] ambarella-ehci 60018000.ehci: USB 2.0 started, EHCI 1.00 [ 4.268500] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002 [ 4.275277] usb usb2: New USB device strings: Mfr=3,
Product=2, SerialNumber=1 [ 4.282551] usb usb2: Product: EHCI Host
Controller [ 4.287406] usb usb2: Manufacturer: Linux 3.10.73
ehci_hcd [ 4.292885] usb usb2: SerialNumber: AmbUSB [ 4.297443]
hub 2-0:1.0: USB hub found [ 4.301182] hub 2-0:1.0: 1 port detected
[ 4.336406] cfg80211: Calling CRDA to update world regulatory
domain [ 4.622126] usb 2-1: new high-speed USB device number 2
using ambarella-ehci [ 4.773781] usb 2-1: New USB device found,
idVendor=05e3, idProduct=0608 [ 4.780466] usb 2-1: New USB device
strings: Mfr=0, Product=1, SerialNumber=0 [ 4.787595] usb 2-1:
Product: USB2.0 Hub [ 4.792332] hub 2-1:1.0: USB hub found [
4.796403] hub 2-1:1.0: 4 ports detected [ 5.082405] usb 2-1.2: new full-speed USB device number 3 using ambarella-ehci [ 5.193783] usb
2-1.2: New USB device found, idVendor=03eb, idProduct=2404 [
5.200641] usb 2-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 5.208938] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM
device [ 5.292404] usb 2-1.3: new high-speed USB device number 4
using ambarella-ehci [ 5.402532] usb 2-1.3: New USB device found,
idVendor=0424, idProduct=9e00 [ 5.409390] usb 2-1.3: New USB device
strings: Mfr=0, Product=0, SerialNumber=0 [ 6.413921] RTL871X:
module init start [ 6.417656] RTL871X: rtl8192du
v4.0.7_12213.20141103-cgoet-usb2.0 [ 6.423747] RTL871X: build time:
Jun 30 2016 15:25:39 [ 6.428959] usbcore: registered new interface
driver rtl8192du [ 6.434786] RTL871X: module init ret=0 Populating
s2e_ipcam using udev: [ 6.497506] systemd-udevd[316]: starting
version 215 Done

usb hub上挂载了四个usb设备。其中usb3接入的是以太网，但是系统启动后。ifconfig 无法识别到eth0 ，上面是启动log，貌似驱动已经识别到usb设备。哪位大神知道，请帮忙解答谢谢