mac80211 client U-APSD support

Hello,

here is my proposal how to add U-APSD client support to mac80211. I also included example driver implementation for wl1251.

Patches should be ready now.

v6:
o store max SP length value in unconverted format and shift is just before use (suggested by Johannes)

v5:
o rename IEEE80211_HW_UAPSD to IEEE80211_HW_SUPPORTS_UAPSD
o U-APSD queue and max SP length configuration debugfs interface (requested by Jason)
o dynamic ps support for U-APSD
o by default enable U-APSD in all queues
o back to RFC state due to new code
o add a warning if both PS_NULLFUNC_STACK and U-APSD are enabled
o wl1251: set qos null data template
o more defines to ieee80211.h

v4:
o use IEEE80211_WMM_IE_STA_QOSINFO prefix in ieee80211.h (Jason Young)
o fix VI and BK qosinfo values in ieee80211.h (Jason Young)
o add IEEE80211_WMM_IE_AP_QOSINFO_UAPSD

v3:
o remove unnecessary debugfs interface, people can recompile mac80211 in case they want to try enable more queues
o add max SP length defines to ieee80211.h
o removed unnecessary code comments

v2:
o remove cfg80211 changes
o rename IEEE80211_QOS_IE to IEEE80211_WMM_IE_STA in ieee80211.h

---

Kalle Valo (7):
mac80211: add U-APSD client support
mac80211: add debugfs interface for U-APSD queue configuration
mac80211: create tx handler for dynamic ps
mac80211: check uapsd state for dynamic power save
ieee80211: add struct ieee80211_hdr_qos
wl1251: create qos null data template
wl1251: add U-APSD support

 drivers/net/wireless/wl12xx/wl1251_main.c |   37 +++++++++-
 include/linux/ieee80211.h                 |   28 ++++++++
 include/net/mac80211.h                    |    7 ++
 net/mac80211/cfg.c                        |    7 ++
 net/mac80211/debugfs.c                    |   94 ++++++++++++++++++++++++++
 net/mac80211/ieee80211_i.h                |   27 +++++++
 net/mac80211/main.c                       |    6 ++
 net/mac80211/mlme.c                       |   31 ++++++++
 net/mac80211/scan.c                       |   18 +++++
 net/mac80211/tx.c                         |  106 ++++++++++++++++++-----------
 net/mac80211/util.c                       |    2 +
 net/mac80211/work.c                       |   12 +++
 12 files changed, 326 insertions(+), 49 deletions(-)