“WLAN overview”的版本间的差异

2020年11月6日 (五) 09:59的最新版本

本文介绍了WLAN框架的组成方式，配置方法以及使用方法。

Purpose

无线局域网（WLAN）是一种无线计算机网络，它使用无线通信链接两个或多个设备以在有限的区域内形成局域网（LAN），例如家庭，学校，计算机实验室，校园，办公楼等。这使用户能够在该区域内四处移动，但仍可以连接到网络。通过网关，WLAN还可以提供与更广泛的Internet的连接。
Linux^® 无线子系统包含两个主要模块：cfg80211和mac80211，它们帮助WiFi驱动程序与内核的其余部分和用户空间建立接口。
特别是，cfg80211在内核中提供配置管理服务。它还通过nl80211在内核和用户空间之间提供管理接口。
软MAC（soft MAC）设备和完整MAC设备都需要与cfg80211一起使用。 Mac80211是仅支持软件MAC设备的驱动程序API

WLAN可以在许多不同的用例中使用，如How to use WLAN部分所述：

如何在客户端模式下配置无线接口： How to configure a wlan interface on client mode
如何在热点模式下配置无线接口：如何将无线网卡配置为热点模式

System overview

WLAN Overview

Description of the components

从用户空间到硬件

应用 (用户空间)

有许多使用WLAN的应用程序：例如Internet浏览器，流应用程序，FTP应用程序。

WLAN工具 (用户空间)

有一组实用程序可以管理WLAN网络： Network tools

CFG80211 API (内核空间)

cfg80211^[1] 是Linux中的IEEE 802.11^[2] 设备的配置API。
- 它桥接了用户空间和驱动程序，并提供了与IEEE 802.11相关的某些实用程序功能。
-Linux中的所有现代无线驱动程序都必须通过mac80211直接或间接地使用它，以便它们通过nl80211提供一致的API^[3].
- 它与 Netlink^[4] socket 连接。

MAC80211框架 (内核空间)

MAC80211是Linux内核的一个子系统，它实现了软MAC/半MAC无线共享代码^[5]

WLAN配套驱动程序 (内核空间)

WLAN配套驱动程序注册和控制WLAN设备。

MMC框架：MMC核心 (内核空间)

MMC内核”'确保与MultiMediaCard（MMC）嵌入式^[6] / ^[7] / 安全数字规范安全数字输入/输出（SDIO )^[8].
MP1和WLAN设备之间的通信链接是SDIO总线。

SDMMC驱动程序 (内核空间)

有关更多信息，请参阅 MMC overview

STM32: SDMMC (硬件)

有关更多信息，请参阅 MMC overview

外部设备 (硬件)

WLAN配套芯片

APIs description

MAC80211是新的无线驱动程序API，它为soft-MAC / half-MAC无线设备实现共享代码^[9]

cfg80211^[10] 是IEEE 802.11的新驱动程序配置API^[11] 在Linux中

Configuration

默认情况下，在ST传送中不会激活WLAN API。要激活它，可以使用Linux Menuconfig工具： Menuconfig or how to configure kernel 然后选择：

对于网络功能：

[*] Networking support  --->  
    [*] Networking options  --->
        [*] Packet socket 
        [*] TCP/IP networking
          [*] IP: kernel level autoconfiguration
            [*] IP: DHCP support
            [*] IP: BOOTP support
            [*] IP: RARP support
        [*] INET: socket monitoring interface
        [*] The IPv6 protocol
        [*] DNS Resolver support
    [*]   Wireless  --->
        [*]   cfg80211 - wireless configuration API
                [*]   cfg80211 wireless extensions compatibility
        [*]   Generic IEEE 802.11 Networking Stack (mac80211)

例如，如果配套芯片是Murata芯片1DX^[12]

[*] Device Drivers  --->
    [*]   Network device support  --->
        [*]   Wireless LAN  --->
             [*]   Broadcom devices
                [*]   Broadcom FullMAC WLAN driver

对于STM32 SDMMC：请参阅 SDMMC configuration

Device tree

DT绑定文档处理所有必需的或可选的 device tree 属性。

STM32外设的详细DT配置： WLAN device tree configuration.

How to use WLAN

How to use the WLAN user space interface

请根据以下用例查看示例：

如何设置wifi连接：如何设置WiFi连接
如何在客户端模式下配置无线接口： How to configure a wlan interface on client mode
如何在热点模式下配置无线接口：如何将无线网卡配置为热点模式

How to trace and debug the framework

How to monitor

请给出说明以帮助开发人员/用户在Linux文件系统中获取有关此框架的信息。

How to watch link quality

Proc文件系统提供有关Quality链接的信息：

Board $> cat /proc/net/wireless 
Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon | 22
wlan0: 0000    0     0     0        0      0      0      0      0        0

STAT示例：

Board $> watch -d -n 3 "iw dev wlan0 station dump; iwconfig wlan0; cat /proc/net/wireless"

Every 3.0s: iw dev wlan0 station dump; iwconfig wlan0; cat /proc/net/wir...  stm32mp1: Sun Nov  4 16:32:52 2018

Station 00:16:b6:2c:47:36 (on wlan0)
       inactive time:  0 ms   
       rx bytes:       11001
       rx packets:     37
       tx bytes:       13077
       tx packets:     83
       tx failed:      0
       signal:         -72 [-72] dBm
       tx bitrate:     12.0 MBit/s
       rx bitrate:     1.0 MBit/s 
       authorized:     yes
       authenticated:  yes
       associated:     yes
       WMM/WME:        no
       TDLS peer:      yes
       DTIM period:    1
       beacon interval:100
       short preamble: yes
       short slot time:yes
       connected time: 55 seconds
wlan0     IEEE 802.11  ESSID:"NETWORK1"
         Mode:Managed  Frequency:2.462 GHz  Access Point: 00:16:B6:2C:47:36
         Bit Rate=12 Mb/s   Tx-Power=31 dBm
         Retry short limit:7   RTS thr:off   Fragment thr:off
         Encryption key:off
         Power Management:on
         Link Quality=38/70  Signal level=-72 dBm
         Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
         Tx excessive retries:0  Invalid misc:0   Missed beacon:0

Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon | 22
wlan0: 0000   38.  -72.  -256        0      0      0      0      0        0

How to trace

本部分以村田芯片（Murata chip）为配套芯片为例

How to verify than the WLAN driver is well probed

在dmesg日志中，检查“ brcmfmac”日志 :

[   67.306154] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Aug  6 2017 23:19:25 version 7.45.98.30 (r666241 CY) FWID 01-f0b000
[   67.326146] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2 Data: 7.11.15 Compiler: 1.24.2 ClmImport: 1.24.1 Creation: 2014-05 
[   67.676323] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)

How to debug the WLAN driver

Add dynamic debug firmware traces

需要在内核配置中激活：CONFIG_DYNAMIC_DEBUG，有关动态调试的更多信息请参阅 How_to_use_the_kernel_dynamic_debug

# cd /sys/kernel/debug/dynamic_debug/

检查用于管理固件的所有功能：

# cat control | grep firmware
drivers/base/firmware_class.c:339 [firmware_class]__fw_free_buf =_ "%s: fw-%s buf=%p data=%p size=%u\012"
drivers/base/firmware_class.c:462 [firmware_class]fw_set_page_data =_ "%s: fw-%s buf=%p data=%p size=%u\012"
drivers/base/firmware_class.c:1102 [firmware_class]_request_firmware_prepare =_ "using built-in %s\012"
drivers/base/firmware_class.c:290 [firmware_class]__allocate_fw_buf =_ "%s: fw-%s buf=%p\012"
drivers/base/firmware_class.c:1194 [firmware_class]_request_firmware =_ "firmware: %s loading timed out\012"
drivers/base/firmware_class.c:423 [firmware_class]fw_get_filesystem_firmware =_ "loading %s failed with error %d\012"
drivers/base/firmware_class.c:429 [firmware_class]fw_get_filesystem_firmware =_ "direct-loading %s\012"

在所有固件功能中添加打印信息“ + p”（p：导致将printk（）消息发送到dmesg）

# echo "file drivers/base/firmware_class.c +p" > control

现在，在所有固件功能中都添加了“ p”选项。

# cat control | grep firmware
drivers/base/firmware_class.c:339 [firmware_class]__fw_free_buf =p "%s: fw-%s buf=%p data=%p size=%u\012"
drivers/base/firmware_class.c:462 [firmware_class]fw_set_page_data =p "%s: fw-%s buf=%p data=%p size=%u\012"
drivers/base/firmware_class.c:1102 [firmware_class]_request_firmware_prepare =p "using built-in %s\012"
drivers/base/firmware_class.c:290 [firmware_class]__allocate_fw_buf =p "%s: fw-%s buf=%p\012"
drivers/base/firmware_class.c:1194 [firmware_class]_request_firmware =p "firmware: %s loading timed out\012"
drivers/base/firmware_class.c:423 [firmware_class]fw_get_filesystem_firmware =p "loading %s failed with error %d\012"
drivers/base/firmware_class.c:429 [firmware_class]fw_get_filesystem_firmware =p "direct-loading %s\012"

FMAC debug

Enable debug features in the defconfig file

启用CPTCFG_BRCMDBG和CONFIG_DEBUG_FS
重新构建内核

Enable brcmfmac debug log

消息级别在' drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h中列出

/* message levels */
#define BRCMF_TRACE_VAL 0x00000002
#define BRCMF_INFO_VAL 0x00000004
#define BRCMF_DATA_VAL 0x00000008
#define BRCMF_CTL_VAL 0x00000010
#define BRCMF_TIMER_VAL 0x00000020
#define BRCMF_HDRS_VAL 0x00000040
#define BRCMF_BYTES_VAL 0x00000080
#define BRCMF_INTR_VAL 0x00000100
#define BRCMF_GLOM_VAL 0x00000200
#define BRCMF_EVENT_VAL 0x00000400
#define BRCMF_BTA_VAL 0x00000800
#define BRCMF_FIL_VAL 0x00001000
#define BRCMF_USB_VAL 0x00002000
#define BRCMF_SCAN_VAL 0x00004000
#define BRCMF_CONN_VAL 0x00008000
#define BRCMF_BCDC_VAL 0x00010000
#define BRCMF_SDIO_VAL 0x00020000
#define BRCMF_MSGBUF_VAL 0x00040000
#define BRCMF_PCIE_VAL 0x00080000
#define BRCMF_FWCON_VAL 0x00100000

$ modprobe brcmfmac debug=${BRCMF_Message_Level}
$ dmesg -n 8

Examples

添加TRACE和INFO

$ modprobe brcmfmac debug=0x6

添加TRACE，INFO和SDIO

$ modprobe brcmfmac debug=0x20006

添加TRACE，INFO和WIFI_FW_LOG

$ modprobe brcmfmac debug=0x00100006

How to check wlreg_on status and voltage setting

$ cat /sys/kernel/debug/regulator/regulator_summary

Source code location

源文件位于Linux内核中。

Broadcom WLAN驱动程序: of.c^[13]

References

↑ [1], cfg80211
↑ [2], IEEE_802.11
↑ [3], nl80211
↑ [4], Netlink
↑ [5], mac80211
↑ MultiMediaCard, MultiMediaCard规范安全数字（SD）
↑ Secure Digital,
↑ Secure Digital Input Output, 安全数字输入输出规范
↑ [6], mac80211
↑ [7], cfg80211
↑ [8], IEEE_802.11
↑ [9], 1DX
↑ [https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c ],of.c

[1] [1], cfg80211

[2] [2], IEEE_802.11

[3] [3], nl80211

[4] [4], Netlink

[5] [5], mac80211

[6] MultiMediaCard, MultiMediaCard规范安全数字（SD）

[7] Secure Digital,

[8] Secure Digital Input Output, 安全数字输入输出规范

[9] [6], mac80211

[10] [7], cfg80211

[11] [8], IEEE_802.11

[12] [9], 1DX

[13] [https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c ],of.c

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

@@ 第57行： / 第57行： @@
 ==Configuration ==
-The WLAN API is not activated by default in ST deliveries. To active it, you can use Linux Menuconfig tool: [[Menuconfig or how to configure kernel | Menuconfig or how to configure kernel ]] and select:
+默认情况下，在ST传送中不会激活WLAN API。 要激活它，可以使用Linux Menuconfig工具： [[Menuconfig or how to configure kernel | Menuconfig or how to configure kernel ]] 然后选择：
-For Network features:
+对于网络功能：
 <pre>
 [*] Networking support  --->
@@ 第78行： / 第78行： @@
 </pre>
-For example if the companion chip is Murata chip 1DX<ref>[http://wireless.murata.com/datasheet?/RFM/data/lbee5kl1dx.pdf], 1DX</ref>
+例如，如果配套芯片是Murata芯片1DX<ref>[http://wireless.murata.com/datasheet?/RFM/data/lbee5kl1dx.pdf], 1DX</ref>
 <pre>
 [*] Device Drivers  --->
@@ 第87行： / 第87行： @@
 </pre>
-For STM32 SDMMC :
+对于STM32 SDMMC：
-see [[MMC_overview#Kernel_configuration | SDMMC configuration]]
+请参阅[[MMC_overview#Kernel_configuration | SDMMC configuration]]
 ===Device tree===
-The DT bindings documentation deals with all required or optional [[Device tree|device tree]] properties.
+DT绑定文档处理所有必需的或可选的 [[Device tree|device tree]] 属性。
-Detailed DT configuration for STM32 peripherals: [[WLAN device tree configuration|WLAN device tree configuration]].
+STM32外设的详细DT配置： [[WLAN device tree configuration|WLAN device tree configuration]].
 == How to use WLAN ==
 === How to use the WLAN user space interface ===
-Please see examples based on the following use cases:
+请根据以下用例查看示例：
-* How to setup wifi connection: [[How_to_setup_wifi_connection|How to setup wifi connection]]
+* 如何设置wifi连接： [[How_to_setup_wifi_connection|How to setup wifi connection]]
-* How to configure a wlan interface on client mode: [[How to configure a wlan interface on client mode|How to configure a wlan interface on client mode]]
+* 如何在客户端模式下配置无线接口： [[How to configure a wlan interface on client mode|How to configure a wlan interface on client mode]]
-* How to configure a wlan interface on hotspot mode: [[How to configure a wlan interface on hotspot mode|How to configure a wlan interface on hotspot mode]]
+* 如何在热点模式下配置无线接口： [[How to configure a wlan interface on hotspot mode|How to configure a wlan interface on hotspot mode]]
 ==How to trace and debug the framework==
 === How to monitor ===
-Please give instruction to help the developer/user to get information about this framework in the Linux file system
+请给出说明以帮助开发人员/用户在Linux文件系统中获取有关此框架的信息。
 ==== How to watch link quality ====
-Proc filesystem provides information about Quality link:
+Proc文件系统提供有关Quality链接的信息：
   {{Board$}} cat /proc/net/wireless
   Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
@@ 第113行： / 第113行： @@
   wlan0: 0000    0     0     0        0      0      0      0      0        0
-Example of stat:
+STAT示例：
   {{Board$}} watch -d -n 3 "iw dev wlan0 station dump; iwconfig wlan0; cat /proc/net/wireless"
@@ 第154行： / 第154行： @@
 === How to trace ===
-This part is as example in case the companion chip is Murata chip
+本部分以村田芯片（Murata chip）为配套芯片为例
 ==== How to verify than the WLAN driver is well probed ====
-* In dmesg log, check "brcmfmac" logs :
+* 在dmesg日志中，检查“ brcmfmac”日志 :
 <pre>
 [   67.306154] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Aug  6 2017 23:19:25 version 7.45.98.30 (r666241 CY) FWID 01-f0b000
@@ 第168行： / 第168行： @@
 ===== Add dynamic debug firmware traces =====
-Need to activate in the kernel config: CONFIG_DYNAMIC_DEBUG, more info on the dynamic debug [[How_to_use_the_kernel_dynamic_debug]]
+需要在内核配置中激活：CONFIG_DYNAMIC_DEBUG，有关动态调试的更多信息请参阅 [[How_to_use_the_kernel_dynamic_debug]]
   # cd /sys/kernel/debug/dynamic_debug/
-Check all functions used to manage firmware:
+检查用于管理固件的所有功能：
 <pre>
@@ 第185行： / 第185行： @@
 </pre>
-Add print info "+p" in all firmware functions (p: causes a printk() message to be emitted to dmesg)
+在所有固件功能中添加打印信息“ + p”（p：导致将printk（）消息发送到dmesg）
   # echo "file drivers/base/firmware_class.c +p" > control
-Now "p" option is added in all firmware functions.
+现在，在所有固件功能中都添加了“ p”选项。
 <pre>
@@ 第205行： / 第205行： @@
 ====== Enable debug features in the defconfig file ======
-* Enable CPTCFG_BRCMDBG and CONFIG_DEBUG_FS
+* 启用CPTCFG_BRCMDBG和CONFIG_DEBUG_FS
-* Rebuild your kernel
+* 重新构建内核
 ====== Enable brcmfmac debug log ======
-* Message levels are listed in '''drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h'''
+* 消息级别在' '''drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h'''中列出
 <pre>
 /* message levels */
@@ 第239行： / 第239行： @@
 ====== Examples ======
-* Add TRACE and INFO
+* 添加TRACE和INFO
   $ modprobe brcmfmac debug=0x6
-* Add TRACE, INFO and SDIO
+* 添加TRACE，INFO和SDIO
   $ modprobe brcmfmac debug=0x20006
-* Add TRACE, INFO and WIFI_FW_LOG
+* 添加TRACE，INFO和WIFI_FW_LOG
   $ modprobe brcmfmac debug=0x00100006
@@ 第253行： / 第253行： @@
 ==Source code location==
-The source files are located inside the Linux kernel.
+源文件位于Linux内核中。
-*'''Broadcom wlan driver''': of.c<ref>[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+*'''Broadcom WLAN驱动程序''': of.c<ref>[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
 ],of.c</ref>
 ==References==
 <noinclude><references /></noinclude>

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2020年11月6日 (五) 09:59的最新版本

目录

Purpose

System overview

Description of the components

APIs description

Configuration

Device tree

How to use WLAN

How to use the WLAN user space interface

How to trace and debug the framework

How to monitor

How to watch link quality

How to trace

How to verify than the WLAN driver is well probed

How to debug the WLAN driver

Add dynamic debug firmware traces

FMAC debug

Enable debug features in the defconfig file

Enable brcmfmac debug log

Examples

How to check wlreg_on status and voltage setting

Source code location

References

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匿名

搜索

“WLAN overview”的版本间的差异

2020年11月6日 (五) 09:59的最新版本

目录

Purpose

System overview

Description of the components

APIs description

Configuration

Device tree

How to use WLAN

How to use the WLAN user space interface

How to trace and debug the framework

How to monitor

How to watch link quality

How to trace

How to verify than the WLAN driver is well probed

How to debug the WLAN driver

Add dynamic debug firmware traces

FMAC debug

Enable debug features in the defconfig file

Enable brcmfmac debug log

Examples

How to check wlreg_on status and voltage setting

Source code location

References

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