net80211: add ieee80211_restart_all() call.

This call may be used when device cannot continue to operate normally
(e.g., throws firmware error, watchdog timer expires)
and need to be restarted.

Approved by:	adrian (mentor)
Differential Revision:	https://reviews.freebsd.org/D3998

4 files changed, 28 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211.c b/sys/net80211/ieee80211.c
index 39e03ea..ca27cb1 100644
--- a/sys/net80211/ieee80211.c
+++ b/sys/net80211/ieee80211.c
@@ -356,6 +356,8 @@ ieee80211_ifdetach(struct ieee80211com *ic)
 	LIST_REMOVE(ic, ic_next);
 	mtx_unlock(&ic_list_mtx);
 
+	taskqueue_drain(taskqueue_thread, &ic->ic_restart_task);
+
 	/*
 	 * The VAP is responsible for setting and clearing
 	 * the VIMAGE context.
diff --git a/sys/net80211/ieee80211_proto.c b/sys/net80211/ieee80211_proto.c
index 52e92ba..408bf93 100644
--- a/sys/net80211/ieee80211_proto.c
+++ b/sys/net80211/ieee80211_proto.c
@@ -108,6 +108,7 @@ static void update_promisc(void *, int);
 static void update_channel(void *, int);
 static void update_chw(void *, int);
 static void update_wme(void *, int);
+static void restart_vaps(void *, int);
 static void ieee80211_newstate_cb(void *, int);
 
 static int
@@ -146,6 +147,7 @@ ieee80211_proto_attach(struct ieee80211com *ic)
 	TASK_INIT(&ic->ic_bmiss_task, 0, beacon_miss, ic);
 	TASK_INIT(&ic->ic_chw_task, 0, update_chw, ic);
 	TASK_INIT(&ic->ic_wme_task, 0, update_wme, ic);
+	TASK_INIT(&ic->ic_restart_task, 0, restart_vaps, ic);
 
 	ic->ic_wme.wme_hipri_switch_hysteresis =
 		AGGRESSIVE_MODE_SWITCH_HYSTERESIS;
@@ -1212,6 +1214,15 @@ update_wme(void *arg, int npending)
 	ic->ic_wme.wme_update(ic);
 }
 
+static void
+restart_vaps(void *arg, int npending)
+{
+	struct ieee80211com *ic = arg;
+
+	ieee80211_suspend_all(ic);
+	ieee80211_resume_all(ic);
+}
+
 /*
  * Block until the parent is in a known state.  This is
  * used after any operations that dispatch a task (e.g.
@@ -1486,6 +1497,19 @@ ieee80211_resume_all(struct ieee80211com *ic)
 	IEEE80211_UNLOCK(ic);
 }
 
+/*
+ * Restart all vap's running on a device.
+ */
+void
+ieee80211_restart_all(struct ieee80211com *ic)
+{
+	/*
+	 * NB: do not use ieee80211_runtask here, we will
+	 * block & drain net80211 taskqueue.
+	 */
+	taskqueue_enqueue(taskqueue_thread, &ic->ic_restart_task);
+}
+
 void
 ieee80211_beacon_miss(struct ieee80211com *ic)
 {
diff --git a/sys/net80211/ieee80211_proto.h b/sys/net80211/ieee80211_proto.h
index 38bd3d6..88633e7 100644
--- a/sys/net80211/ieee80211_proto.h
+++ b/sys/net80211/ieee80211_proto.h
@@ -307,6 +307,7 @@ void	ieee80211_stop(struct ieee80211vap *);
 void	ieee80211_stop_all(struct ieee80211com *);
 void	ieee80211_suspend_all(struct ieee80211com *);
 void	ieee80211_resume_all(struct ieee80211com *);
+void	ieee80211_restart_all(struct ieee80211com *);
 void	ieee80211_dturbo_switch(struct ieee80211vap *, int newflags);
 void	ieee80211_swbmiss(void *arg);
 void	ieee80211_beacon_miss(struct ieee80211com *);
diff --git a/sys/net80211/ieee80211_var.h b/sys/net80211/ieee80211_var.h
index 5c5b1c9..cd27ead 100644
--- a/sys/net80211/ieee80211_var.h
+++ b/sys/net80211/ieee80211_var.h
@@ -134,6 +134,7 @@ struct ieee80211com {
 	struct task		ic_bmiss_task;	/* deferred beacon miss hndlr */
 	struct task		ic_chw_task;	/* deferred HT CHW update */
 	struct task		ic_wme_task;	/* deferred WME update */
+	struct task		ic_restart_task; /* deferred device restart */
 
 	counter_u64_t		ic_ierrors;	/* input errors */
 	counter_u64_t		ic_oerrors;	/* output errors */