From: Alan Ott <alan@signal11.us>
Date: Wed, 3 Apr 2013 04:00:56 +0000 (+0000)
Subject: mac802154: Use netif flow control
X-Git-Tag: v3.10-rc1~66^2~219
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b5992fe962b0c91880229ec31166517e4db2977b;p=platform%2Fkernel%2Flinux-exynos.git

mac802154: Use netif flow control

Use netif_stop_queue() and netif_wake_queue() to control the flow of
packets to mac802154 devices.  Since many IEEE 802.15.4 devices have no
output buffer, and since the mac802154 xmit() function is designed to
block, netif_stop_queue() is called after each packet.

Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index 7264874..3fd3e07 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -25,6 +25,7 @@
 #include <linux/if_arp.h>
 #include <linux/crc-ccitt.h>
 
+#include <net/ieee802154_netdev.h>
 #include <net/mac802154.h>
 #include <net/wpan-phy.h>
 
@@ -44,6 +45,7 @@ struct xmit_work {
 static void mac802154_xmit_worker(struct work_struct *work)
 {
 	struct xmit_work *xw = container_of(work, struct xmit_work, work);
+	struct mac802154_sub_if_data *sdata;
 	int res;
 
 	mutex_lock(&xw->priv->phy->pib_lock);
@@ -65,6 +67,11 @@ static void mac802154_xmit_worker(struct work_struct *work)
 out:
 	mutex_unlock(&xw->priv->phy->pib_lock);
 
+	/* Restart the netif queue on each sub_if_data object. */
+	rcu_read_lock();
+	list_for_each_entry_rcu(sdata, &xw->priv->slaves, list)
+		netif_wake_queue(sdata->dev);
+	rcu_read_unlock();
 
 	dev_kfree_skb(xw->skb);
 
@@ -75,6 +82,7 @@ netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb,
 			 u8 page, u8 chan)
 {
 	struct xmit_work *work;
+	struct mac802154_sub_if_data *sdata;
 
 	if (!(priv->phy->channels_supported[page] & (1 << chan))) {
 		WARN_ON(1);
@@ -102,6 +110,12 @@ netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb,
 		return NETDEV_TX_BUSY;
 	}
 
+	/* Stop the netif queue on each sub_if_data object. */
+	rcu_read_lock();
+	list_for_each_entry_rcu(sdata, &priv->slaves, list)
+		netif_stop_queue(sdata->dev);
+	rcu_read_unlock();
+
 	INIT_WORK(&work->work, mac802154_xmit_worker);
 	work->skb = skb;
 	work->priv = priv;