rtwn: create a new HAL routine for enabling STA mode beacon processing

[adrian]

Summary

For some NICs (notably the rtl8192cu that I'm working on) the
firmware rate adaptation requires beacon processing to be enabled.

Instead of making assumptions in the if_rtwn beacon routines (and
honestly all of that should be in the HAL too), create a HAL method
for enabling/disabling beacon processing specifically in STA mode.

Since this isn't necessarily required for all NICs (notably the RTL8188E
NICs, where some will do firmware rate control and some will require
driver rate control), only enable it for the RTL8192CU and RT8192EU.

The RTL8188E and RTL8812/RTL8821 just have no-op routines for now.

Locally tested:

• RTL8192CU, STA mode

[bz]

sys/dev/rtwn/rtl8192c/r92c_beacon.c

94

I'll mark it here for the entire file: "enable" is a bool; please use that in new code and no longer an int.

[adrian]

use bool; requested by bz@

[adrian]

ok, try this!

[bz]

Missed one but good apart from that; I'll trust you to fix this before commit. Thank you!

sys/dev/rtwn/rtl8192c/r92c_beacon.c

73

bool

[adrian]

sys/dev/rtwn/rtl8192c/r92c_beacon.c

73

This is an existing routine, not a new one. I'll do a subsequent commit after this stack lands to clean the non-STA beacon API up!

[emaste]

sys/dev/rtwn/rtl8192c/r92c_beacon.c

73

I think including a change to bool on this would be fine rolled into this commit, but it doesn't really matter, fine as a subsequent cleanup too.

[bz]

sys/dev/rtwn/rtl8192c/r92c_beacon.c

73

Sorry. My fault.