CentOS8中如何支持TL-WDN7200H無線USB網卡？

今日在筆記本電腦ThinkBook 14 IML接入TP-LINK的TL-WDN7200H AC 1900雙頻高增益無線USB網卡，支持2.4GHz 600Mbps+5GHz 1300Mbps。

Windows10是免安裝驅動直接可以支持的。但在CentOS Linux 8系統卻遇到了麻煩，並無相關驅動支持，無法使用。

查看當前內核版本：

[root@centos ~]# uname -aLinux centos 4.18.0-147.6.el8.x86_64 #1 SMP Tue Oct 15 15:19:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

注意：要記住版本號4.18.0，稍後編譯時修改代碼要用。

尋思想通過自行編譯驅動來解決，先要找到芯片廠商型號。

列出USB：

[root@centos ~]# lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 005: ID 5986:2113 Acer, Inc Bus 001 Device 004: ID 27c6:55a4  Bus 001 Device 003: ID 18f8:1286 [Maxxter] Bus 001 Device 002: ID 2357:0106 TP-Link Bus 001 Device 006: ID 8087:0aaa Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

看到Bus 001 Device 002: ID 2357:0106 TP-Link，提取ID 2357:0106，查找信息得知是無線USB網卡芯片廠商是realtek，型號是8814au。

在github找到Realtek 8814AU USB WiFi driver，下載編譯。

注意：要找到這個版本rtl8814au v4.3.21_17997.20160531，不要找最新版本。

編譯出現第一個錯誤：

/tmp/rtl8814au/os_dep/linux/os_intfs.c:914:22: error: initialization of ‘u16 (*)(struct net_device *, struct sk_buff *, struct net_device *, u16 (*)(struct net_device *, struct sk_buff *, struct net_device *))’ {aka ‘short unsigned int (*)(struct net_device *, struct sk_buff *, struct net_device *, short unsigned int (*)(struct net_device *, struct sk_buff *, struct net_device *))’} from incompatible pointer type ‘u16 (*)(struct net_device *, struct sk_buff *, void *, u16 (*)(struct net_device *, struct sk_buff *, struct net_device *))’ {aka ‘short unsigned int (*)(struct net_device *, struct sk_buff *, void *, short unsigned int (*)(struct net_device *, struct sk_buff *, struct net_device *))’} [-Werror=incompatible-pointer-types]  .ndo_select_queue = rtw_select_queue,                      ^~~~~~~~~~~~~~~~/tmp/rtl8814au/os_dep/linux/os_intfs.c:914:22: note: (near initialization for ‘rtw_netdev_ops.ndo_select_queue’)cc1: some warnings being treated as errorsmake[2]: *** [scripts/Makefile.build:313: /tmp/rtl8814au/os_dep/linux/os_intfs.o] Error 1make[1]: *** [Makefile:1547: _module_/tmp/rtl8814au] Error 2make[1]: Leaving directory '/usr/src/kernels/4.18.0-147.6.el8.x86_64'make: *** [Makefile:1699: modules] Error 2

打開rtl8814au目錄下os_dep/linux/os_intfs.c文件，定位到rtw_select_queue函數：

static u16 rtw_select_queue(struct net_device *dev, struct sk_buff *skb#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)                                      , void *accel_priv#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0)                                 , select_queue_fallback_t fallback#endif
#endif)

改成如下即可：

static u16 rtw_select_queue(struct net_device *dev, struct sk_buff *skb#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)        #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)        , struct net_device *sb_dev        #else        , void *accel_priv        #endif        #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0) & LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)        , select_queue_fallback_t fallback        #endif#endif)

繼續編譯發現第二個錯誤：

/tmp/rtl8814au/os_dep/linux/rtw_android.c: In function ‘rtw_android_priv_cmd’:/tmp/rtl8814au/os_dep/linux/rtw_android.c:615:62: error: macro "access_ok" passed 3 arguments, but takes just 2  if (!access_ok(VERIFY_READ, priv_cmd.buf, priv_cmd.total_len)){                                                              ^/tmp/rtl8814au/os_dep/linux/rtw_android.c:615:7: error: ‘access_ok’ undeclared (first use in this function)  if (!access_ok(VERIFY_READ, priv_cmd.buf, priv_cmd.total_len)){       ^~~~~~~~~/tmp/rtl8814au/os_dep/linux/rtw_android.c:615:7: note: each undeclared identifier is reported only once for each function it appears inmake[2]: *** [scripts/Makefile.build:313: /tmp/rtl8814au/os_dep/linux/rtw_android.o] Error 1make[1]: *** [Makefile:1547: _module_/tmp/rtl8814au] Error 2make[1]: Leaving directory '/usr/src/kernels/4.18.0-147.6.el8.x86_64'make: *** [Makefile:1699: modules] Error 2

打開rtl8814au目錄下os_dep/linux/rtw_android.c文件，定位到rtw_android_priv_cmd函數：

if (!access_ok(VERIFY_READ, priv_cmd.buf, priv_cmd.total_len)){

改成如下即可：

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0))if (!access_ok(priv_cmd.buf, priv_cmd.total_len)) {#elseif (!access_ok(VERIFY_READ, priv_cmd.buf, priv_cmd.total_len)) {#endif

繼續編譯正常通過了！

最後可看到已經生成8814au.ko：

LD [M]  /tmp/rtl8814au/8814au.o  Building modules, stage 2.  MODPOST 1 modules  CC      /tmp/rtl8814au/8814au.mod.o  LD [M]  /tmp/rtl8814au/8814au.komake[1]: Leaving directory '/usr/src/kernels/4.18.0-147.6.el8.x86_64'

安裝後使用加載模塊：

modprobe 8814au

cat /proc/kmsg可看到：

<4>[19967.549960] RTL871X: module init start<4>[19967.549961] RTL871X: rtl8814au v4.3.21_17997.20160531<4>[19967.671171] RTL871X: rtw_ndev_init(wlan0) if1 mac_addr=08:1f:71:24:64:8a<6>[19967.671505] usbcore: registered new interface driver rtl8814au<4>[19967.671507] RTL871X: module init ret=0<6>[19967.682791] rtl8814au 1-3:1.0 wlp0s20f0u3: renamed from wlan0<6>[19967.697724] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u3: link is not ready<6>[19968.104292] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u3: link is not ready<6>[19968.106996] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u3: link is not ready<6>[19968.121708] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u3: link is not ready<4>[19971.176837] RTL871X: nolinked power save enter<6>[19971.191472] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u3: link is not ready<4>[19971.617442] RTL871X: nolinked power save leave<4>[19974.653364] RTL871X: rtw_set_802_11_connect(wlp0s20f0u3)  fw_state=0x00000008<4>[19974.859910] RTL871X: start auth<4>[19974.862100] RTL871X: auth success, start assoc<4>[19974.880289] RTL871X: rtw_cfg80211_indicate_connect(wlp0s20f0u3) BSS not found !!<4>[19974.880316] RTL871X: assoc success<4>[19975.010392] RTL871X: recv eapol packet<4>[19975.010619] RTL871X: send eapol packet<4>[19975.013448] RTL871X: recv eapol packet<4>[19975.013527] RTL871X: send eapol packet<4>[19975.013596] RTL871X: set pairwise key camid:4, addr:74:05:a5:01:23:45, kid:0, type:AES<6>[19975.013730] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s20f0u3: link becomes ready<4>[19975.014452] RTL871X: set group key camid:5, addr:74:05:a5:01:23:45, kid:2, type:AES