MIPS 4.14.x kernel rtl8812au USB

[jefflancaster]

Mediatek mt76x8, openwrt build, mipsel-openwrt-linux-, kernel ver 4.14.41

ifconfig -a does not list the device.

root@OpenWrt:/# lsmod | grep 8812
cfg80211 212580 5 mt76x2e,mt7603e,mt76,mac80211,rtl8812au
rtl8812au 1177191 0
usbcore 123427 6 rtl8812au,ledtrig_usbport,ohci_platform,ohci_hcd,ehci_platform,ehci_hcd

Any thoughts or wild guesses are welcome, or if you can boil down the essence of what happened here. I'm currently looking into it.

[ 12.059470] kmodloader: loading kernel modules from /etc/modules.d/*
[ 12.071284] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 12.089063] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[ 12.097255] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[ 13.622217] RTL871X: module init start
[ 13.626031] RTL871X: rtl8812au v4.3.14_13455.20150212_BTCOEX20150128-51
[ 13.632801] RTL871X: rtl8812au BT-Coex version = BTCOEX20150128-51
[ 13.639988] ------------[ cut here ]------------
[ 13.644790] WARNING: CPU: 0 PID: 453 at backports-2017-11-01/net/wireless/core.c:730 wiphy_register+0x5a8/0x734 [cfg80211]
[ 13.656039] Modules linked in: rtl8812au(+) cfg80211 compat ledtrig_usbport ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_
mangle ip6table_filter ip6_tables x_tables leds_gpio ohci_platform ohci_hcd ehci_platform ehci_hcd gpio_button_hotplug usbcore nls_base usb_c
ommon
[ 13.681606] CPU: 0 PID: 453 Comm: kmodloader Not tainted 4.14.41 #0
[ 13.687968] Stack : 00000000 00000000 80477502 00000037 839f6954 8041b8e7 803c9a5c 000001c5
[ 13.696455] 80473650 000002da 83b6bc00 014000c0 8006cda8 00000000 831cba30 d077bf5f
[ 13.704950] 00000000 00000000 80470000 000000b8 00000000 6e696174 20646574 34312e34
[ 13.713445] 67756c70 00000400 ffffffff 62737520 80000000 00000000 83281100 832aef20
[ 13.721941] 00000009 000002da 83b6bc00 014000c0 00000002 801d2868 00000000 80470000
[ 13.730436] ...
[ 13.732918] Call Trace:
[ 13.735423] [<8000e384>] show_stack+0x74/0x104
[ 13.739963] [<800244f0>] _warn+0x110/0x118
[ 13.744212] [<8002458c>] warn_slowpath_null+0x1c/0x30
[ 13.749383] [<83281100>] wiphy_register+0x5a8/0x734 [cfg80211]
[ 13.756107] [<82c5cf80>] rtw_wdev_alloc+0xf8/0x218 [rtl8812au]
[ 13.763619] [<82c47314>] rtw_usb_if1_init+0xe8/0x6a0 [rtl8812au]
[ 13.771296] [<82c4764c>] rtw_usb_if1_init+0x420/0x6a0 [rtl8812au]
[ 13.778283] ---[ end trace d42760760c2d3795 ]---
[ 13.782963] ------------[ cut here ]------------
[ 13.787735] WARNING: CPU: 0 PID: 453 at backports-2017-11-01/net/wireless/core.c:789 wiphy_register+0x5c/0x734 [cfg80211]
[ 13.798848] Modules linked in: rtl8812au(+) cfg80211 compat ledtrig_usbport ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table
mangle ip6table_filter ip6_tables x_tables leds_gpio ohci_platform ohci_hcd ehci_platform ehci_hcd gpio_button_hotplug usbcore nls_base usb_c
ommon
[ 13.824397] CPU: 0 PID: 453 Comm: kmodloader Tainted: G W 4.14.41 #0
[ 13.831988] Stack : 00000000 00000000 80477502 00000045 839f6954 8041b8e7 803c9a5c 000001c5
[ 13.840484] 80473650 00000315 83b6bc00 014000c0 8006cda8 00000000 831cba30 d077bf5f
[ 13.848979] 00000000 00000000 80470000 000000cb 00000000 20202020 2e342020 342e3431
[ 13.857471] 67756c70 00000003 f8000000 62737520 80000000 00000000 83280bb4 832aef20
[ 13.865957] 00000009 00000315 83b6bc00 014000c0 00000000 801d2868 00000000 80470000
[ 13.874449] ...
[ 13.876936] Call Trace:
[ 13.879438] [<8000e384>] show_stack+0x74/0x104
[ 13.883962] [<800244f0>] __warn+0x110/0x118
[ 13.888222] [<8002458c>] warn_slowpath_null+0x1c/0x30
[ 13.893380] [<83280bb4>] wiphy_register+0x5c/0x734 [cfg80211]
[ 13.900026] [<82c5cf80>] rtw_wdev_alloc+0xf8/0x218 [rtl8812au]
[ 13.907524] [<82c47314>] rtw_usb_if1_init+0xe8/0x6a0 [rtl8812au]
[ 13.915180] [<82c4764c>] rtw_usb_if1_init+0x420/0x6a0 [rtl8812au]
[ 13.922163] ---[ end trace d42760760c2d3796 ]---
[ 14.076758] usb 1-1: reset high-speed USB device number 2 using ehci-platform
[ 14.277716] usbcore: registered new interface driver rtl8812au
[ 14.283638] RTL871X: module init ret=0
[ 14.293853] ip_tables: (C) 2000-2006 Netfilter Core Team

[chbmuc]

I had the same problem on arm64 with OpenWRT and I tracked it down.

OpenWRT is using drivers from "backports project". For this reason the cfg80211 module was compiled with a header file that has a slightly different wiphy structure from the standard kernel headers. To resolve this you need to apply a patch from the backports project to the kernel headers (in the OpenWRT-SDK) before compiling the driver:

https://git.kernel.org/pub/scm/linux/kernel/git/backports/backports.git/tree/patches/0003-cfg80211-wext-padding/include_net_cfg80211.patch