This document discusses the networking capabilities and configuration of the Sony Ericsson Xperia mobile phone. It describes the 3G and WiFi connectivity supported by the phone's Qualcomm Snapdragon processor running Android. It provides details on how to use adb shell commands like netcfg, ifconfig, and cat /proc/kmsg to view network configuration and logs. It also explains the use of the rmnet and wlan drivers to manage 3G and WiFi connections at the kernel level.

1. xHago

2. ✤ xperia
✤ 3G
✤ WiFi
✤

3. xperia
✤ Sony Ericsson
✤ android1.6 => android2.1
✤ snapdragon
✤ 3G WiFi Bluetooth
✤ adb shell netcfg ifconfig
✤ 3G rmnet%d
✤ 0-2 3channel
✤ WiFi wlan%d
✤ cat /proc/kmsg (/var/log/messages)

4. rmnet
✤
✤
✤ kernel/arch/arm/mach-msm/smd.c
✤
✤ kernel/drivers/net/msm_rmnet.c
✤ 3 channel
✤
✤ xperia 0

5. xmit_func() rmnet
•
xmit_func()
•
msm_smd

6. rmnet-write to BB-
len
len 0 0 0 0 data
0xE0100000
DMA??
FIFO MAC
BB

7. rmnet-read from BB-
rmnet
netif_rx()
ethernet type?? smd_net_data_handler()
msm_smd
read

8. rmnet-write to BB-
handler()
socket buffer allocate
0xE0180000
DMA??
FIFO MAC
BB

9. for hangup
✤ adb shell
✤ ping -i 0.01 -s 3000
✤ 30000
✤
✤ android
✤

10. wlan
✤ ioctl
✤
✤ …
✤ AR6000
✤ AP
✤ Authentication Association
✤
✤ iwconfig
✤ ioctl
✤ WiFi on rmnet (ifconfig down )

11. WiFi
iwconfig wlan0 ***
netif wpa iwconfig
ioctl
wlan
wlan device

12. ✤
✤ linux on android
✤ snapdragon
✤ android
✤
✤ …
✤ Medium Access Control on …
✤ C MAC-ARQ
✤ linux