aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorStephen Hemminger <shemminger@vyatta.com>2009-06-17 07:30:38 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-17 18:46:54 -0700
commitbd1c6869f14f88aa82587ff51303e72dc7eec30e (patch)
tree73b0f1bb457cdf15065b77df847c9af68f49df60
parente9c1be80a7403fb817ec6229ec20a39e377cc4ce (diff)
downloadlinux-2.6.34-ux500-bd1c6869f14f88aa82587ff51303e72dc7eec30e.tar.gz
sky2: skb recycling
This patch implements skb recycling. It reclaims transmitted skb's for use in the receive ring. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/sky2.c38
-rw-r--r--drivers/net/sky2.h1
2 files changed, 28 insertions, 11 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 6e95d2f5410..4f2afc770f8 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1176,6 +1176,7 @@ static void sky2_rx_clean(struct sky2_port *sky2)
re->skb = NULL;
}
}
+ skb_queue_purge(&sky2->rx_recycle);
}
/* Basic MII support */
@@ -1252,6 +1253,12 @@ static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp
}
#endif
+/* Amount of required worst case padding in rx buffer */
+static inline unsigned sky2_rx_pad(const struct sky2_hw *hw)
+{
+ return (hw->flags & SKY2_HW_RAM_BUFFER) ? 8 : 2;
+}
+
/*
* Allocate an skb for receiving. If the MTU is large enough
* make the skb non-linear with a fragment list of pages.
@@ -1261,6 +1268,13 @@ static struct sk_buff *sky2_rx_alloc(struct sky2_port *sky2)
struct sk_buff *skb;
int i;
+ skb = __skb_dequeue(&sky2->rx_recycle);
+ if (!skb)
+ skb = netdev_alloc_skb(sky2->netdev, sky2->rx_data_size
+ + sky2_rx_pad(sky2->hw));
+ if (!skb)
+ goto nomem;
+
if (sky2->hw->flags & SKY2_HW_RAM_BUFFER) {
unsigned char *start;
/*
@@ -1269,18 +1283,10 @@ static struct sk_buff *sky2_rx_alloc(struct sky2_port *sky2)
* The buffer returned from netdev_alloc_skb is
* aligned except if slab debugging is enabled.
*/
- skb = netdev_alloc_skb(sky2->netdev, sky2->rx_data_size + 8);
- if (!skb)
- goto nomem;
start = PTR_ALIGN(skb->data, 8);
skb_reserve(skb, start - skb->data);
- } else {
- skb = netdev_alloc_skb(sky2->netdev,
- sky2->rx_data_size + NET_IP_ALIGN);
- if (!skb)
- goto nomem;
+ } else
skb_reserve(skb, NET_IP_ALIGN);
- }
for (i = 0; i < sky2->rx_nfrags; i++) {
struct page *page = alloc_page(GFP_ATOMIC);
@@ -1357,6 +1363,8 @@ static int sky2_rx_start(struct sky2_port *sky2)
sky2->rx_data_size = size;
+ skb_queue_head_init(&sky2->rx_recycle);
+
/* Fill Rx ring */
for (i = 0; i < sky2->rx_pending; i++) {
re = sky2->rx_ring + i;
@@ -1764,14 +1772,22 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
}
if (le->ctrl & EOP) {
+ struct sk_buff *skb = re->skb;
+
if (unlikely(netif_msg_tx_done(sky2)))
printk(KERN_DEBUG "%s: tx done %u\n",
dev->name, idx);
dev->stats.tx_packets++;
- dev->stats.tx_bytes += re->skb->len;
+ dev->stats.tx_bytes += skb->len;
+
+ if (skb_queue_len(&sky2->rx_recycle) < sky2->rx_pending
+ && skb_recycle_check(skb, sky2->rx_data_size
+ + sky2_rx_pad(sky2->hw)))
+ __skb_queue_head(&sky2->rx_recycle, skb);
+ else
+ dev_kfree_skb_any(skb);
- dev_kfree_skb_any(re->skb);
sky2->tx_next = RING_NEXT(idx, TX_RING_SIZE);
}
}
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 92fb24b27d4..b5549c9e510 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -2028,6 +2028,7 @@ struct sky2_port {
u16 rx_pending;
u16 rx_data_size;
u16 rx_nfrags;
+ struct sk_buff_head rx_recycle;
#ifdef SKY2_VLAN_TAG_USED
u16 rx_tag;