Click to access mac80211_intro.pdf
https://www.linux.com/blog/linux-wireless-networking-short-walk
http://processors.wiki.ti.com/index.php/WL18xx_Linux_Wireless_Architecture
http://processors.wiki.ti.com/index.php/WL127x_WLAN_API_Information
https://wireless.wiki.kernel.org/en/developers/Regulatory/processing_rules#Country_IE_processing
DMA
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt
Packet Queueing
https://www.coverfire.com/articles/queueing-in-the-linux-network-stack/
https://stackoverflow.com/questions/36625892/descriptor-concept-in-nic#
https://www.tldp.org/LDP/khg/HyperNews/get/net/net-intro.html