gianfar: Add support for skb recycling

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index bd21b6d..33de256 100644 (file)
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1181,6 +1181,8 @@ static int gfar_enet_open(struct net_device *dev)
 
        napi_enable(&priv->napi);
 
+       skb_queue_head_init(&priv->rx_recycle);
+
        /* Initialize a bunch of registers */
        init_registers(dev);
 
@@ -1399,6 +1401,7 @@ static int gfar_close(struct net_device *dev)
 
        napi_disable(&priv->napi);
 
+       skb_queue_purge(&priv->rx_recycle);
        cancel_work_sync(&priv->reset_task);
        stop_gfar(dev);
 
@@ -1595,7 +1598,17 @@ static int gfar_clean_tx_ring(struct net_device *dev)
                        bdp = next_txbd(bdp, base, tx_ring_size);
                }
 
-               dev_kfree_skb_any(skb);
+               /*
+                * If there's room in the queue (limit it to rx_buffer_size)
+                * we add this skb back into the pool, if it's the right size
+                */
+               if (skb_queue_len(&priv->rx_recycle) < priv->rx_ring_size &&
+                               skb_recycle_check(skb, priv->rx_buffer_size +
+                                       RXBUF_ALIGNMENT))
+                       __skb_queue_head(&priv->rx_recycle, skb);
+               else
+                       dev_kfree_skb_any(skb);
+
                priv->tx_skbuff[skb_dirtytx] = NULL;
 
                skb_dirtytx = (skb_dirtytx + 1) &
@@ -1668,8 +1681,10 @@ struct sk_buff * gfar_new_skb(struct net_device *dev)
        struct gfar_private *priv = netdev_priv(dev);
        struct sk_buff *skb = NULL;
 
-       /* We have to allocate the skb, so keep trying till we succeed */
-       skb = netdev_alloc_skb(dev, priv->rx_buffer_size + RXBUF_ALIGNMENT);
+       skb = __skb_dequeue(&priv->rx_recycle);
+       if (!skb)
+               skb = netdev_alloc_skb(dev,
+                               priv->rx_buffer_size + RXBUF_ALIGNMENT);
 
        if (!skb)
                return NULL;
@@ -1817,7 +1832,7 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
                        if (unlikely(!newskb))
                                newskb = skb;
                        else if (skb)
-                               dev_kfree_skb_any(skb);
+                               __skb_queue_head(&priv->rx_recycle, skb);
                } else {
                        /* Increment the number of packets */
                        dev->stats.rx_packets++;

diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index 3cb901b..811855b 100644 (file)
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -758,6 +758,8 @@ struct gfar_private {
        unsigned int rx_stash_size;
        unsigned int rx_stash_index;
 
+       struct sk_buff_head rx_recycle;
+
        struct vlan_group *vlgrp;
 
        /* Unprotected fields */