Migrate the power-save functions to be overridable VAP methods.

This turns ieee80211_node_pwrsave(), ieee80211_sta_pwrsave() and
ieee80211_recv_pspoll() into methods.

The intent is to let drivers override these and tie into the power save
management pathway.

For ath(4), this is the beginning of forcing a node software queue to
stop and start as needed, as well as supporting "leaking" single frames
from the software queue to the hardware.

Right now, ieee80211_recv_pspoll() will attempt to transmit a single frame
to the hardware (whether it be a data frame on the power-save queue or
a NULL data frame) but the driver may have hardware/software queued frames
queued up.  This initial work is an attempt at providing the hooks required
to implement correct behaviour.

Allowing ieee80211_node_pwrsave() to be overridden allows the ath(4)
driver to pause and unpause the entire software queue for a given node.
It doesn't make sense to transmit anything whilst the node is asleep.

Please note that there are other corner cases to correctly handle -
specifically, setting the MORE data bit correctly on frames to a station,
as well as keeping the TIM updated.  Those particular issues can be
addressed later.

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211_var.h b/sys/net80211/ieee80211_var.h
index 935b848..7ec00ee 100644
--- a/sys/net80211/ieee80211_var.h
+++ b/sys/net80211/ieee80211_var.h
@@ -486,6 +486,11 @@ struct ieee80211vap {
 	/* power save handling */
 	void			(*iv_update_ps)(struct ieee80211vap *, int);
 	int			(*iv_set_tim)(struct ieee80211_node *, int);
+	void			(*iv_node_ps)(struct ieee80211_node *, int);
+	void			(*iv_sta_ps)(struct ieee80211vap *, int);
+	void			(*iv_recv_pspoll)(struct ieee80211_node *,
+				    struct mbuf *);
+
 	/* state machine processing */
 	int			(*iv_newstate)(struct ieee80211vap *,
 				    enum ieee80211_state, int);