Android 系统使RNDIS网卡上网

背景说明：

一位台湾客户需要采购一批SIMCOM SIM6600CE模组用于Tinker board2s，需要适配Debain系统和Android系统。

主要修改点：

1、defconfig 增加RNDIS HOST驱动

2、在option.c中屏蔽interface 0、1两个cdc接口

3、修改usbnet.c，使rndis网卡的名称从usb0变成eth0。因为Android默认只挂载eth网卡，所以为了提高Android系统兼容性并减少修改难度，直接在驱动层入手。

diff --git a/arch/arm64/configs/tinker_board_2_defconfig b/arch/arm64/configs/tinker_board_2_defconfig
index 5e0f2a8..ddd4a07 100755
--- a/arch/arm64/configs/tinker_board_2_defconfig
+++ b/arch/arm64/configs/tinker_board_2_defconfig
@@ -794,7 +794,7 @@ CONFIG_USB_GADGET_VBUS_DRAW=500
 CONFIG_USB_CONFIGFS=y
 CONFIG_USB_CONFIGFS_UEVENT=y
 CONFIG_USB_CONFIGFS_ACM=y
-CONFIG_USB_CONFIGFS_RNDIS=y
+# CONFIG_USB_CONFIGFS_RNDIS=y
 CONFIG_USB_CONFIGFS_MASS_STORAGE=y
 CONFIG_USB_CONFIGFS_F_FS=y
 CONFIG_USB_CONFIGFS_F_ACC=y
@@ -949,6 +949,7 @@ CONFIG_CRYPTO_DEV_ROCKCHIP=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_FS=y
+CONFIG_DYNAMIC_DEBUG=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_SOFTLOCKUP_DETECTOR=y
 CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=10
diff --git a/drivers/net/usb/rndis_host.c b/drivers/net/usb/rndis_host.c
index d3f79a4..3edb1fe 100644
--- a/drivers/net/usb/rndis_host.c
+++ b/drivers/net/usb/rndis_host.c
@@ -15,6 +15,9 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
+#define    DEBUG            // error path messages, extra info
+#define    VERBOSE            // more; success messages
+
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index adab6e2..8bf5de2 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1771,6 +1771,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
         if ((dev->driver_info->flags & FLAG_NOARP) != 0)
             net->flags |= IFF_NOARP;

+        if (strncmp("RNDIS device", dev->driver_info->description,
+                sizeof("RNDIS device") - 1) == 0)
+            strcpy(net->name, "eth%d");
+
         /* maybe the remote can't receive an Ethernet MTU */
         if (net->mtu > (dev->hard_mtu - net->hard_header_len))
             net->mtu = dev->hard_mtu - net->hard_header_len;
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 3a66f1e..25175c0 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -526,6 +526,7 @@ static void option_instat_callback(struct urb *urb);
 #define MEDIATEK_PRODUCT_FP_2COM        0x0023
 #define MEDIATEK_PRODUCT_FPDC_1COM        0x0043
 #define MEDIATEK_PRODUCT_FPDC_2COM        0x0033
+#define MEDIATEK_PRODUCT_SIM6600        0x2010

 /* Cellient products */
 #define CELLIENT_VENDOR_ID            0x2692
@@ -2001,6 +2002,8 @@ static const struct usb_device_id option_ids[] = {
     { USB_DEVICE_AND_INTERFACE_INFO(MEDIATEK_VENDOR_ID, MEDIATEK_PRODUCT_7106_2COM, 0x02, 0x02, 0x01) },
     { USB_DEVICE_AND_INTERFACE_INFO(MEDIATEK_VENDOR_ID, MEDIATEK_PRODUCT_DC_4COM2, 0xff, 0x02, 0x01) },
     { USB_DEVICE_AND_INTERFACE_INFO(MEDIATEK_VENDOR_ID, MEDIATEK_PRODUCT_DC_4COM2, 0xff, 0x00, 0x00) },
+    { USB_DEVICE(MEDIATEK_VENDOR_ID, MEDIATEK_PRODUCT_SIM6600),
+      .driver_info =  RSVD(0) | RSVD(1) },
     { USB_DEVICE(CELLIENT_VENDOR_ID, CELLIENT_PRODUCT_MEN200) },
     { USB_DEVICE(CELLIENT_VENDOR_ID, CELLIENT_PRODUCT_MPL200),
       .driver_info = RSVD(1) | RSVD(4) },

USB连接SIM6600CE后，使用ifconfig命令出现了eth1，此时可以发现Android系统已经自动给eth1分配了ip，系统状态栏出现以太网图标。注意，如果在framework层修改默认挂载网卡位usb0也可以解决上网问题，但是eth网卡就不能上网了，这会对开发板自带的以太网网卡以及后续可能会挂载的usb网卡造成影响。