1 files changed, 236 insertions, 44 deletions

diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index 935aa4b6deee..abb226dc4753 100644
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -16,6 +16,7 @@
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
 #include "driver-trace.h"
+#include "driver-ops.h"
 
 /*
  * Tell our hardware to disable PS.
@@ -181,34 +182,58 @@ void ieee80211_offchannel_return(struct ieee80211_local *local,
 	mutex_unlock(&local->iflist_mtx);
 }
 
+void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc)
+{
+	if (roc->notified)
+		return;
+
+	if (roc->mgmt_tx_cookie) {
+		if (!WARN_ON(!roc->frame)) {
+			ieee80211_tx_skb(roc->sdata, roc->frame);
+			roc->frame = NULL;
+		}
+	} else {
+		cfg80211_ready_on_channel(roc->sdata->dev, (unsigned long)roc,
+					  roc->chan, roc->chan_type,
+					  roc->req_duration, GFP_KERNEL);
+	}
+
+	roc->notified = true;
+}
+
 static void ieee80211_hw_roc_start(struct work_struct *work)
 {
 	struct ieee80211_local *local =
 		container_of(work, struct ieee80211_local, hw_roc_start);
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_roc_work *roc, *dep, *tmp;
 
 	mutex_lock(&local->mtx);
 
-	if (!local->hw_roc_channel) {
-		mutex_unlock(&local->mtx);
-		return;
-	}
+	if (list_empty(&local->roc_list))
+		goto out_unlock;
 
-	if (local->hw_roc_skb) {
-		sdata = IEEE80211_DEV_TO_SUB_IF(local->hw_roc_dev);
-		ieee80211_tx_skb(sdata, local->hw_roc_skb);
-		local->hw_roc_skb = NULL;
-	} else {
-		cfg80211_ready_on_channel(local->hw_roc_dev,
-					  local->hw_roc_cookie,
-					  local->hw_roc_channel,
-					  local->hw_roc_channel_type,
-					  local->hw_roc_duration,
-					  GFP_KERNEL);
-	}
+	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
+			       list);
+
+	if (!roc->started)
+		goto out_unlock;
 
-	ieee80211_recalc_idle(local);
+	roc->hw_begun = true;
+	roc->hw_start_time = local->hw_roc_start_time;
 
+	ieee80211_handle_roc_started(roc);
+	list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
+		ieee80211_handle_roc_started(dep);
+
+		if (dep->duration > roc->duration) {
+			u32 dur = dep->duration;
+			dep->duration = dur - roc->duration;
+			roc->duration = dur;
+			list_del(&dep->list);
+			list_add(&dep->list, &roc->list);
+		}
+	}
+ out_unlock:
 	mutex_unlock(&local->mtx);
 }
 
@@ -216,52 +241,179 @@ void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 
+	local->hw_roc_start_time = jiffies;
+
 	trace_api_ready_on_channel(local);
 
 	ieee80211_queue_work(hw, &local->hw_roc_start);
 }
 EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
 
-static void ieee80211_hw_roc_done(struct work_struct *work)
+void ieee80211_start_next_roc(struct ieee80211_local *local)
 {
-	struct ieee80211_local *local =
-		container_of(work, struct ieee80211_local, hw_roc_done);
+	struct ieee80211_roc_work *roc;
 
-	mutex_lock(&local->mtx);
+	lockdep_assert_held(&local->mtx);
 
-	if (!local->hw_roc_channel) {
-		mutex_unlock(&local->mtx);
+	if (list_empty(&local->roc_list)) {
+		ieee80211_run_deferred_scan(local);
 		return;
 	}
 
-	/* was never transmitted */
-	if (local->hw_roc_skb) {
-		u64 cookie;
+	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
+			       list);
 
-		cookie = local->hw_roc_cookie ^ 2;
+	if (local->ops->remain_on_channel) {
+		int ret, duration = roc->duration;
 
-		cfg80211_mgmt_tx_status(local->hw_roc_dev, cookie,
-					local->hw_roc_skb->data,
-					local->hw_roc_skb->len, false,
-					GFP_KERNEL);
+		/* XXX: duplicated, see ieee80211_start_roc_work() */
+		if (!duration)
+			duration = 10;
 
-		kfree_skb(local->hw_roc_skb);
-		local->hw_roc_skb = NULL;
-		local->hw_roc_skb_for_status = NULL;
+		ret = drv_remain_on_channel(local, roc->chan,
+					    roc->chan_type,
+					    duration);
+
+		roc->started = true;
+
+		if (ret) {
+			wiphy_warn(local->hw.wiphy,
+				   "failed to start next HW ROC (%d)\n", ret);
+			/*
+			 * queue the work struct again to avoid recursion
+			 * when multiple failures occur
+			 */
+			ieee80211_remain_on_channel_expired(&local->hw);
+		}
+	} else {
+		/* delay it a bit */
+		ieee80211_queue_delayed_work(&local->hw, &roc->work,
+					     round_jiffies_relative(HZ/2));
+	}
+}
+
+void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
+{
+	struct ieee80211_roc_work *dep, *tmp;
+
+	/* was never transmitted */
+	if (roc->frame) {
+		cfg80211_mgmt_tx_status(roc->sdata->dev,
+					(unsigned long)roc->frame,
+					roc->frame->data, roc->frame->len,
+					false, GFP_KERNEL);
+		kfree_skb(roc->frame);
 	}
 
-	if (!local->hw_roc_for_tx)
-		cfg80211_remain_on_channel_expired(local->hw_roc_dev,
-						   local->hw_roc_cookie,
-						   local->hw_roc_channel,
-						   local->hw_roc_channel_type,
+	if (!roc->mgmt_tx_cookie)
+		cfg80211_remain_on_channel_expired(roc->sdata->dev,
+						   (unsigned long)roc,
+						   roc->chan, roc->chan_type,
 						   GFP_KERNEL);
 
-	local->hw_roc_channel = NULL;
-	local->hw_roc_cookie = 0;
+	list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
+		ieee80211_roc_notify_destroy(dep);
+
+	kfree(roc);
+}
+
+void ieee80211_sw_roc_work(struct work_struct *work)
+{
+	struct ieee80211_roc_work *roc =
+		container_of(work, struct ieee80211_roc_work, work.work);
+	struct ieee80211_sub_if_data *sdata = roc->sdata;
+	struct ieee80211_local *local = sdata->local;
+
+	mutex_lock(&local->mtx);
+
+	if (roc->abort)
+		goto finish;
+
+	if (WARN_ON(list_empty(&local->roc_list)))
+		goto out_unlock;
+
+	if (WARN_ON(roc != list_first_entry(&local->roc_list,
+					    struct ieee80211_roc_work,
+					    list)))
+		goto out_unlock;
+
+	if (!roc->started) {
+		struct ieee80211_roc_work *dep;
+
+		/* start this ROC */
 
-	ieee80211_recalc_idle(local);
+		/* switch channel etc */
+		ieee80211_recalc_idle(local);
 
+		local->tmp_channel = roc->chan;
+		local->tmp_channel_type = roc->chan_type;
+		ieee80211_hw_config(local, 0);
+
+		/* tell userspace or send frame */
+		ieee80211_handle_roc_started(roc);
+		list_for_each_entry(dep, &roc->dependents, list)
+			ieee80211_handle_roc_started(dep);
+
+		/* if it was pure TX, just finish right away */
+		if (!roc->duration)
+			goto finish;
+
+		roc->started = true;
+		ieee80211_queue_delayed_work(&local->hw, &roc->work,
+					     msecs_to_jiffies(roc->duration));
+	} else {
+		/* finish this ROC */
+ finish:
+		list_del(&roc->list);
+		ieee80211_roc_notify_destroy(roc);
+
+		if (roc->started) {
+			drv_flush(local, false);
+
+			local->tmp_channel = NULL;
+			ieee80211_hw_config(local, 0);
+
+			ieee80211_offchannel_return(local, true);
+		}
+
+		ieee80211_recalc_idle(local);
+
+		ieee80211_start_next_roc(local);
+		ieee80211_run_deferred_scan(local);
+	}
+
+ out_unlock:
+	mutex_unlock(&local->mtx);
+}
+
+static void ieee80211_hw_roc_done(struct work_struct *work)
+{
+	struct ieee80211_local *local =
+		container_of(work, struct ieee80211_local, hw_roc_done);
+	struct ieee80211_roc_work *roc;
+
+	mutex_lock(&local->mtx);
+
+	if (list_empty(&local->roc_list))
+		goto out_unlock;
+
+	roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
+			       list);
+
+	if (!roc->started)
+		goto out_unlock;
+
+	list_del(&roc->list);
+
+	ieee80211_roc_notify_destroy(roc);
+
+	/* if there's another roc, start it now */
+	ieee80211_start_next_roc(local);
+
+	/* or scan maybe */
+	ieee80211_run_deferred_scan(local);
+
+ out_unlock:
 	mutex_unlock(&local->mtx);
 }
 
@@ -275,8 +427,48 @@ void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
 }
 EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
 
-void ieee80211_hw_roc_setup(struct ieee80211_local *local)
+void ieee80211_roc_setup(struct ieee80211_local *local)
 {
 	INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
 	INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
+	INIT_LIST_HEAD(&local->roc_list);
+}
+
+void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_roc_work *roc, *tmp;
+	LIST_HEAD(tmp_list);
+
+	mutex_lock(&local->mtx);
+	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
+		if (roc->sdata != sdata)
+			continue;
+
+		if (roc->started && local->ops->remain_on_channel) {
+			/* can race, so ignore return value */
+			drv_cancel_remain_on_channel(local);
+		}
+
+		list_move_tail(&roc->list, &tmp_list);
+		roc->abort = true;
+	}
+
+	ieee80211_start_next_roc(local);
+	ieee80211_run_deferred_scan(local);
+	mutex_unlock(&local->mtx);
+
+	list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
+		if (local->ops->remain_on_channel) {
+			list_del(&roc->list);
+			ieee80211_roc_notify_destroy(roc);
+		} else {
+			ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
+
+			/* work will clean up etc */
+			flush_delayed_work(&roc->work);
+		}
+	}
+
+	WARN_ON_ONCE(!list_empty(&tmp_list));
 }