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Date: Mon, 20 Oct 2008 19:09:22 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: Jeff Garzik <jgarzik@...ox.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH] sky2: skb recycling
Add support for recycling tx buffers into receive buffers.
This is experimental at this point.
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
---
Since the merge window appears to have past, this can wait until 2.6.29
--- a/drivers/net/sky2.c 2008-10-20 16:16:32.000000000 -0700
+++ b/drivers/net/sky2.c 2008-10-20 17:03:29.000000000 -0700
@@ -1165,6 +1165,8 @@ static void sky2_rx_clean(struct sky2_po
re->skb = NULL;
}
}
+
+ skb_queue_purge(&sky2->rx_recycle);
}
/* Basic MII support */
@@ -1250,26 +1252,24 @@ static struct sk_buff *sky2_rx_alloc(str
struct sk_buff *skb;
int i;
+ skb = __skb_dequeue(&sky2->rx_recycle);
+ if (!skb) {
+ skb = netdev_alloc_skb(sky2->netdev, sky2->rx_data_size);
+ if (!skb)
+ goto nomem;
+ }
+
if (sky2->hw->flags & SKY2_HW_RAM_BUFFER) {
- unsigned char *start;
/*
* Workaround for a bug in FIFO that cause hang
* if the FIFO if the receive buffer is not 64 byte aligned.
* 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);
+ unsigned char *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);
@@ -1344,7 +1344,9 @@ static int sky2_rx_start(struct sky2_por
if (size < ETH_HLEN)
size = ETH_HLEN;
- sky2->rx_data_size = size;
+ /* Add padding for either IP or DMA alignment */
+ sky2->rx_data_size = size + 8;
+ skb_queue_head_init(&sky2->rx_recycle);
/* Fill Rx ring */
for (i = 0; i < sky2->rx_pending; i++) {
@@ -1684,7 +1686,7 @@ static int sky2_xmit_frame(struct sk_buf
* NB: the hardware will tell us about partial completion of multi-part
* buffers so make sure not to free skb to early.
*/
-static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
+static void sky2_tx_complete(struct sky2_port *sky2, u16 done, int recycle)
{
struct net_device *dev = sky2->netdev;
struct pci_dev *pdev = sky2->hw->pdev;
@@ -1713,14 +1715,21 @@ static void sky2_tx_complete(struct sky2
}
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;
- dev_kfree_skb_any(re->skb);
+ if (recycle
+ && skb_queue_len(&sky2->rx_recycle) < sky2->rx_pending
+ && skb_recycle_check(skb, sky2->rx_data_size))
+ __skb_queue_head(&sky2->rx_recycle, skb);
+ else
+ dev_kfree_skb_any(skb);
sky2->tx_next = RING_NEXT(idx, TX_RING_SIZE);
}
}
@@ -1738,7 +1747,7 @@ static void sky2_tx_clean(struct net_dev
struct sky2_port *sky2 = netdev_priv(dev);
netif_tx_lock_bh(dev);
- sky2_tx_complete(sky2, sky2->tx_prod);
+ sky2_tx_complete(sky2, sky2->tx_prod, 0);
netif_tx_unlock_bh(dev);
}
@@ -2291,7 +2300,7 @@ static inline void sky2_tx_done(struct n
if (netif_running(dev)) {
netif_tx_lock(dev);
- sky2_tx_complete(sky2, last);
+ sky2_tx_complete(sky2, last, 1);
netif_tx_unlock(dev);
}
}
--- a/drivers/net/sky2.h 2008-10-20 16:16:32.000000000 -0700
+++ b/drivers/net/sky2.h 2008-10-20 16:29:42.000000000 -0700
@@ -2020,7 +2020,8 @@ struct sky2_port {
u16 tx_last_mss;
u32 tx_tcpsum;
- struct rx_ring_info *rx_ring ____cacheline_aligned_in_smp;
+ struct sk_buff_head rx_recycle;
+ struct rx_ring_info *rx_ring;
struct sky2_rx_le *rx_le;
u16 rx_next; /* next re to check */
--
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