Linux内核配置——使用USB转网络功能_linux usb转网口配置

1.需求描述

      有时候在进行嵌入式开发中，目标板或者待开发的产品板子没有RJ45网口，这个时候又需要目标板能够与PC之间有网络连接，便于文件传输和其他网络功能使用，那么这个时候如果目标板有USB接口，也可以让其具备网络功能。

2.硬件模块

需要一个usb转网络模块，如下图所示：

3.开启相关配置

USB相关配置：

CONFIG_USB：

Prompt: Support for Host-side USB                                        |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  
  |       -> USB support (USB_SUPPORT [=y])  

 CONFIG_USB配置kernel相关源码：

kernel/drivers/usb/core
kernel/drivers/usb/core/usbcore.c

 CONFIG_USB_DWC2：

Prompt: DesignWare USB2 DRD Core Support                                 |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  

  |       -> USB support (USB_SUPPORT [=y])  

CONFIG_USB_DWC2_HOST:

Prompt: Host only mode                                                   |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  
  |       -> USB support (USB_SUPPORT [=y])                                  |  
  |         -> DesignWare USB2 DRD Core Support (USB_DWC2 [=m])              |  
  |           -> DWC2 Mode Selection (<choice> [=y])

 CONFIG_USB_DWC2配置kernel相关源码：

kernel/drivers/usb/dwc2
kernel/drivers/usb/dwc2/dwc2.c

CONFIG_USB_USBNET:

 Prompt: Multi-purpose USB Networking Framework                           |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  
  |       -> Network device support (NETDEVICES [=y])                        |  
  |         -> USB Network Adapters (USB_NET_DRIVERS [=m]) 

CONFIG_USB_NET_AX8817X:

Prompt: ASIX AX88xxx Based USB 2.0 Ethernet Adapters                     |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  
  |       -> Network device support (NETDEVICES [=y])                        |  
  |         -> USB Network Adapters (USB_NET_DRIVERS [=m])                   |  
  |           -> Multi-purpose USB Networking Framework (USB_USBNET [=m]) 

CONFIG_USB_USBNET, CONFIG_USB_NET_AX8817X配置kernel相关源码：

kernel/drivers/net/usb
kernel/drivers/net/usb/asix.c

CONFIG_INGENIC_INNOPHY:

Prompt: Ingenic usb phy(INNO) implemented.                               |  
  |   Location:                                                              |  
  |     -> Device Drivers                                                    |  
  |       -> USB support (USB_SUPPORT [=y])                                  |  
  |         -> USB Physical Layer drivers                                    |  
  |           -> Ingenic usb Phy selects (<choice> [=y]) 

 CONFIG_INGENIC_INNOPHY配置kernel相关源码：

kernel/drivers/usb/phy/phy-ingenic-inno.c

4.板端现象

接上usb转网络设备后：

# [34890.278234] usb 1-1: new high-speed USB device number 3 using dwc2
 
[root@Zeratul:~]# [34891.320513] asix 1-1:1.0 eth0: register 'asix' at usb-13500000.otg-1, ASIX AX88772B USB 2.0 Ethernet, 00:6f:00:01:05:4c

ifconfig -a命令查看网卡节点，新增出现了eth0节点：

# ifconfig -a
bleth0    Link encap:Ethernet  HWaddr CC:D8:43:21:DD:F0  
          inet addr:192.168.80.55  Bcast:192.168.80.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:25801 errors:0 dropped:1 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3185513 (3.0 MiB)  TX bytes:180 (180.0 B)
 
eth0      Link encap:Ethernet  HWaddr 00:6F:00:01:05:4C  
          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)
 
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  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:1 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

使用uhcpc命令，获取局域网内ip地址，并可以ping通局域网ip地址：

# udhcpc eth0
udhcpc (v1.22.1) started
[35048.802148] asix 1-1:1.0 eth0: link down
Sending discover...
[35050.723127] asix 1-1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
Sending discover...
Sending select for 172.17.150.144...
Lease of 172.17.150.144 obtained, lease time 86202
deleting routers
adding dns 172.17.210.100
adding dns 172.17.210.101
#
#
#
# ping 172.17.151.10
PING 172.17.151.10 (172.17.151.10): 56 data bytes
64 bytes from 172.17.151.10: seq=0 ttl=128 time=1.093 ms
64 bytes from 172.17.151.10: seq=1 ttl=128 time=0.754 ms
64 bytes from 172.17.151.10: seq=2 ttl=128 time=0.766 ms
64 bytes from 172.17.151.10: seq=3 ttl=128 time=0.685 ms
64 bytes from 172.17.151.10: seq=4 ttl=128 time=0.688 ms
 
--- 172.17.151.10 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 0.685/0.797/1.093 ms