mac802154: add interframe spacing time handling

This patch adds a new interframe spacing time handling into mac802154
layer. Interframe spacing time is a time period between each transmit.
This patch adds a high resolution timer into mac802154 and starts on
xmit complete with corresponding interframe spacing expire time if
ifs_handling is true. We make it variable because it depends if
interframe spacing time is handled by transceiver or mac802154. At the
timer complete function we wake the netdev queue again. This avoids
new frame transmit in range of interframe spacing time.

For synced driver we add no handling of interframe spacing time. This
is currently a lack of support in all synced xmit drivers. I suppose
it's working because the latency of workqueue which is needed to call
spi_sync.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 29 insertions, 3 deletions

diff --git a/net/mac802154/util.c b/net/mac802154/util.c
index 9a04e4a..5fc9790 100644
--- a/net/mac802154/util.c
+++ b/net/mac802154/util.c
@@ -50,9 +50,35 @@ void ieee802154_stop_queue(struct ieee802154_hw *hw)
 }
 EXPORT_SYMBOL(ieee802154_stop_queue);
 
-void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb)
+enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
 {
-	ieee802154_wake_queue(hw);
-	consume_skb(skb);
+	struct ieee802154_local *local =
+		container_of(timer, struct ieee802154_local, ifs_timer);
+
+	ieee802154_wake_queue(&local->hw);
+
+	return HRTIMER_NORESTART;
+}
+
+void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
+			      bool ifs_handling)
+{
+	if (ifs_handling) {
+		struct ieee802154_local *local = hw_to_local(hw);
+
+		if (skb->len > 18)
+			hrtimer_start(&local->ifs_timer,
+				      ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
+				      HRTIMER_MODE_REL);
+		else
+			hrtimer_start(&local->ifs_timer,
+				      ktime_set(0, hw->phy->sifs_period * NSEC_PER_USEC),
+				      HRTIMER_MODE_REL);
+
+		consume_skb(skb);
+	} else {
+		ieee802154_wake_queue(hw);
+		consume_skb(skb);
+	}
 }
 EXPORT_SYMBOL(ieee802154_xmit_complete);