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WLAN overview
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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。<br /> Linux<sup>®</sup> 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。 <br /> 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。 <br /> 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<br /> WLAN可以在许多不同的用例中使用,如[[#How to use WLAN|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|How to configure a wlan interface on client 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]] ==System overview== [[File:wlan_overview.png|thumb|center|766px|link=|alt=Alternate text|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| Network tools]] *'''CFG80211 API''' (内核空间) cfg80211<ref>[https://wireless.wiki.kernel.org/en/developers/Documentation/cfg80211], cfg80211</ref> 是Linux中的IEEE 802.11<ref>[https://en.wikipedia.org/wiki/IEEE_802.11], IEEE_802.11</ref> 设备的配置API。<br /> - 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。<br /> -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<ref> [https://wireless.wiki.kernel.org/en/developers/Documentation/nl80211], nl80211</ref>.<br /> - 它与 Netlink<ref>[https://en.wikipedia.org/wiki/Netlink], Netlink</ref> 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<ref>[https://wireless.wiki.kernel.org/en/developers/Documentation/mac80211], mac80211</ref> *'''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<ref>[https://www.jedec.org/standards-documents/technology-focus-areas/flash-memory-ssds-ufs-emmc/e-mmc MultiMediaCard], MultiMediaCard规范安全数字('''SD''')</ref> / <ref>[https://www.sdcard.org/ Secure Digital], </ref> / 安全数字规范安全数字输入/输出('''SDIO ''')<ref>[https://www.sdcard.org/ Secure Digital Input Output], 安全数字输入输出规范</ref>.<br /> 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<ref>[https://wireless.wiki.kernel.org/en/developers/Documentation/mac80211], mac80211</ref> cfg80211<ref>[https://wireless.wiki.kernel.org/en/developers/Documentation/cfg80211], cfg80211</ref> 是IEEE 802.11的新驱动程序配置API<ref>[https://en.wikipedia.org/wiki/IEEE_802.11], IEEE_802.11</ref> 在Linux中<br /> ==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 | Menuconfig or how to configure kernel ]] 然后选择: 对于网络功能: <pre> [*] 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) </pre> 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 ---> [*] Network device support ---> [*] Wireless LAN ---> [*] Broadcom devices [*] Broadcom FullMAC WLAN driver </pre> 对于STM32 SDMMC: 请参阅[[MMC_overview#Kernel_configuration | SDMMC configuration]] ===Device tree=== DT绑定文档处理所有必需的或可选的 [[Device tree|device tree]] 属性。 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 === 请根据以下用例查看示例: * 如何设置wifi连接: [[How_to_setup_wifi_connection|How to setup wifi connection]] * 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]] * 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 === 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 : <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 [ 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) </pre> ==== 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: <pre> # 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" </pre> 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。 <pre> # 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" </pre> ===== 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 <pre> /* 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 </pre> $ 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<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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