Create a new task to handle 802.11n channel width changes.

Currently, a channel width change updates the 802.11n HT info data in
net80211 but it doesn't trigger any device changes.  So the device
driver may decide that HT40 frames can be transmitted but the last
device channel set only had HT20 set.

Now, a task is scheduled so a hardware reset or change isn't done
during any active ongoing RX. It also means that it's serialised
with the other task operations (eg channel change.)

This isn't the final incantation of this work, see below.

For now, any unmodified drivers will simply receive a channel
change log entry.  A subsequent patch to ath(4) will introduce
some basic channel change handling (by resetting the NIC.)
Other NICs may need to update their rate control information.

TODO:

* There's still a small window at the present moment where the
  channel width has been updated but the task hasn't been fired.
  The final version of this should likely pass in a channel width
  field to the driver and let the driver atomically do whatever
  it needs to before changing the channel.

PR:		kern/166286

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211_node.h b/sys/net80211/ieee80211_node.h
index f438025..3d9cc1c 100644
--- a/sys/net80211/ieee80211_node.h
+++ b/sys/net80211/ieee80211_node.h
@@ -324,6 +324,7 @@ void	ieee80211_sync_curchan(struct ieee80211com *);
 void	ieee80211_setupcurchan(struct ieee80211com *,
 	    struct ieee80211_channel *);
 void	ieee80211_setcurchan(struct ieee80211com *, struct ieee80211_channel *);
+void	ieee80211_update_chw(struct ieee80211com *);
 int	ieee80211_ibss_merge(struct ieee80211_node *);
 struct ieee80211_scan_entry;
 int	ieee80211_sta_join(struct ieee80211vap *, struct ieee80211_channel *,