Add jumbo frame support. Set the port MTU as high as we can (up to 9500)
and allocate dma maps and receive buffers to match.
Repair the 'ifconfig mode' command.
The 'mode' command is supposed to force a wireless interface into 11a/b/g/n
media mode. This stopped working some time ago, probably during my work on
background scanning. Problem spotted by mlarkin@ who noticed that interfaces
were using 11g mode while forced to 11b mode.
ok phessler, jmatthew
The past is fuzzy, but it appears during development of __getcwd, *retval
was used to return the length of the path, when the actual return value is 0.
This would cause confusing results in ktrace.
Diagnosed with beck since __realpath() picked up the same odd behaviour