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linux-sg2042
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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>
This commit is contained in:
Stephen Hemminger 2009-06-17 07:30:38 +00:00 committed by David S. Miller
parent e9c1be80a7
commit bd1c6869f1
2 changed files with 28 additions and 11 deletions
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38
drivers/net/sky2.c
View File

@ -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);
}
}

1
drivers/net/sky2.h
View File

@ -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;