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authorJohn Crispin <john@openwrt.org>2012-01-17 11:23:11 +0000
committerJohn Crispin <john@openwrt.org>2012-01-17 11:23:11 +0000
commita2708d11e88d423279e3a90869c6d5e6405d3f6f (patch)
treed59e86b66fe6ea5b3add301748e8dbeaceb2a583
parent2683b5b15de6b1fce7e1e6d84694c7cc441f0e49 (diff)
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ramips: Rework ramips_eth to not require irqsave locking anymore
Previously the tx housekeeping was done in a spin_lock_irqsave critical section which causes irqs to be disabled during that time. Since the housekeeping is already prepared to be scheduled as a tasklet process the housekeeping only in softirq context and revise the locking between the tx path and the housekeeping tasklet by using a normal spin_lock which in most situations will be a NOP anyway. This makes sure that interrupts are only disabled for a short time since in the worst case the housekeeping might have to free up to 256 skbs. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> SVN-Revision: 29762
-rw-r--r--target/linux/ramips/files/drivers/net/ramips.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/target/linux/ramips/files/drivers/net/ramips.c b/target/linux/ramips/files/drivers/net/ramips.c
index 63570c7..0bc6c06 100644
--- a/target/linux/ramips/files/drivers/net/ramips.c
+++ b/target/linux/ramips/files/drivers/net/ramips.c
@@ -215,7 +215,6 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
unsigned long tx;
unsigned int tx_next;
unsigned int mapped_addr;
- unsigned long flags;
if (priv->plat->min_pkt_len) {
if (skb->len < priv->plat->min_pkt_len) {
@@ -233,7 +232,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
DMA_TO_DEVICE);
dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
- spin_lock_irqsave(&priv->page_lock, flags);
+ spin_lock(&priv->page_lock);
tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
tx_next = (tx + 1) % NUM_TX_DESC;
@@ -250,11 +249,11 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
priv->tx_skb[tx] = skb;
wmb();
ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
- spin_unlock_irqrestore(&priv->page_lock, flags);
+ spin_unlock(&priv->page_lock);
return NETDEV_TX_OK;
out:
- spin_unlock_irqrestore(&priv->page_lock, flags);
+ spin_unlock(&priv->page_lock);
dev->stats.tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
@@ -313,6 +312,7 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
struct net_device *dev = (struct net_device*)ptr;
struct raeth_priv *priv = netdev_priv(dev);
+ spin_lock(&priv->page_lock);
while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
(priv->tx_skb[priv->skb_free_idx])) {
dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
@@ -321,6 +321,7 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
if (priv->skb_free_idx >= NUM_TX_DESC)
priv->skb_free_idx = 0;
}
+ spin_unlock(&priv->page_lock);
ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
}
@@ -346,8 +347,10 @@ ramips_eth_irq(int irq, void *dev)
tasklet_schedule(&priv->rx_tasklet);
}
- if (fe_int & RAMIPS_TX_DLY_INT)
- ramips_eth_tx_housekeeping((unsigned long)dev);
+ if (fe_int & RAMIPS_TX_DLY_INT) {
+ ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
+ tasklet_schedule(&priv->tx_housekeeping_tasklet);
+ }
return IRQ_HANDLED;
}