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Date: Wed, 17 Jul 2013 12:07:12 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Michel Behr <michelbehr@gmail.com>
Subject: Re: Bill Paul's network drivers
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On Wed, 17 Jul 2013, Michel Behr wrote:

> Hi
>
> I'm considering learning how to build drivers, so I can make my Lenovo S400
> wireless card get detected by FreeBSD.
>
> The Architecture Handbook cites these "Bill Paul's network drivers".
>
> 9.5 Network Drivers: Drivers for network devices do not use device nodes in
> order to be accessed. Their selection is based on other decisions made
> inside the kernel and instead of calling open(), use of a network device is
> generally introduced by using the system call socket(2).
>
> For more information see ifnet(9), the source of the loopback device, and
> Bill Paul's network drivers.
>
> Where can I find those Bill Paul's network drivers?

In the source tree, mostly:
   find /usr/src -path "*/sys/dev/*" -exec grep -l "Bill Paul" {} \+

Joseph Kong's book "FreeBSD Device Drivers" will likely be useful, too:
http://nostarch.com/bsddrivers.htm