• MateuszPiotrowski
• Drivers
• WiFi101

Learn about the wireless

• WiFi Basics: http://www.cs.miami.edu/home/burt/learning/Csc524.052/notes/wifi.html

• Introduction to Wi-Fi (802.11 or WiFi): http://ccm.net/contents/802-introduction-to-wi-fi-802-11-or-wifi

• Comparison of open-source wireless drivers: https://en.wikipedia.org/wiki/Comparison_of_open-source_wireless_drivers

• intro(4)

• ifnet(9)

• wlan(4)

• ieee80211(9)

• WiFi

• AdrianChadd

• Kong, Joseph. (2012). FreeBSD Device Drivers: A Guide for the Intrepid. No Starch Press.: https://www.nostarch.com/bsddrivers.htm

  • Chapter 16: Network Drivers, Part 1: Data Structures
  • Chapter 17: Network Drivers, Part 2: Packet Reception and Transmission

Theory

• Interoperability: https://en.wikipedia.org/wiki/Interoperability

• WLAN Channels: https://en.wikipedia.org/wiki/List_of_WLAN_channels

Technical terms

• Frame aggregation: https://en.wikipedia.org/wiki/Frame_aggregation

• TX and RX paths:

  • A little bit out-dated (HAL was deprecated around 2011) but main concepts still hold: https://madwifi.wordpress.com/2009/04/16/tx-rx-path/

• AP, ADHOC, STA modes:

  • What is the difference between Access Point mode and Ad-Hoc mode? http://support.connectify.me/article/8-what-is-the-difference-between-access-point-mode-and-ad-hoc-mode

• Wi-Fi Aggregation

  • AMSDU vs AMPDU: A Brief Tutorial on WiFi Aggregation Support: https://arxiv.org/ftp/arxiv/papers/1704/1704.07015.pdf

802.11n

802.11n Demystified. Key considerations for n-abling the Wireless Enterprise: http://www.winncom.com/images/stories/Motorola_802.11nDEM_WP_v4_0209.pdf

What is an antenna chain and how do I figure out the correct setting for my router? (A post about 802.11n features): https://superuser.com/q/744065/442991

Nomadic Communications. 802.11n/ac: MIMO and Space Diversity: http://disi.unitn.it/locigno/didattica/NC/15-16/04_802.11n-ac_MIMO.pdf

Getting started with kernel projects

FreeBSD Architecture Handbook. Chapter 9. Writing FreeBSD Device Drivers: https://www.freebsd.org/doc/en/books/arch-handbook/driverbasics.html

Getting started with kernel projects: Graphics/Getting started with kernel projects

How to write a Device Driver in FreeBSD: https://www.bsdcan.org/2006/papers/freebsd.device.driver.slides.pdf

Intel WiFi drivers

• iwn(4)

• dev/iwn(4)

• iwm(4)

Glossary

AMPDU

Aggregated-MAC Packet Data Unit

BBS

Basic Service Set

http://www.juniper.net/documentation/en_US/network-director1.5/topics/concept/wireless-ssid-bssid-essid.html#jd0e47

CRC

Cyclic Redundancy Check

https://en.wikipedia.org/wiki/Cyclic_redundancy_check

CTS

Clear To Send

https://sites.google.com/site/embeddedsystesting/wireless-protocols-and-basics-of-wireless-protocols-wlan-802-11a-b-g-n/what-is-rts-threshold-in-wireless

FC

Frame Control

https://stackoverflow.com/a/12719038/4694621

GI

Guard Interval

HT

High Throughput

Introduced in 802.11n.

ICV

Integrity Check Value

IE

Information Element

https://en.wikipedia.org/wiki/IEEE_802.11#Information_Elements

IV

Initialization Vector

LLT

Low Latency Transport

MCS

Modulation and Coding Scheme

MPDU

MAC Protocol Data Unit

MSDU

MAC Service Data Unit

NIC

Network Interface Controller

OFDM

Orthogonal Frequency Division Multiplex

http://www.radio-electronics.com/info/rf-technology-design/ofdm/ofdm-basics-tutorial.php

P2P GO

Peer-to-Peer Group Owner

Wi-Fi Direct, Section 3.1 Architecture: https://hsc.com/Portals/0/Uploads/Articles/WFD_Technology_Whitepaper_v_1.7635035318321315728.pdf

QoS

Quality of Service

RS

Rate Scaling

RTS

Request To Send

https://sites.google.com/site/embeddedsystesting/wireless-protocols-and-basics-of-wireless-protocols-wlan-802-11a-b-g-n/what-is-rts-threshold-in-wireless

STA

Station Computer

TKIP

Temporal Key Integrity Protocol

https://en.wikipedia.org/wiki/Temporal_Key_Integrity_Protocol

TSF

Timing Synchronization Function

https://en.wikipedia.org/wiki/Timing_Synchronization_Function

VHT

Very High Throughput

Introduced in 802.11ac.

http://www.electronicdesign.com/communications/understanding-ieee-80211ac-vht-wireless

XMIT

Transmit

indicates that I've not read it yet (and most often just scanned through)