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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>
This commit is contained in:
Alan Ott 2013-04-03 04:00:56 +00:00 committed by David S. Miller
parent 7dd43d356e
commit b5992fe962
1 changed files with 14 additions and 0 deletions
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14
net/mac802154/tx.c
View File

@ -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;