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authorJohn Crispin <john@openwrt.org>2009-10-29 12:51:45 +0000
committerJohn Crispin <john@openwrt.org>2009-10-29 12:51:45 +0000
commit135111a05bc6676275768abd3ec6cb63846cb24e (patch)
tree7ca3dc9134f5ce5390c47715c1c7c29a57f7cf03 /target/linux/ramips
parent1a2862798a9302208de01c3b6a68740ddedbdea4 (diff)
downloadmtk-20170518-135111a05bc6676275768abd3ec6cb63846cb24e.zip
mtk-20170518-135111a05bc6676275768abd3ec6cb63846cb24e.tar.gz
mtk-20170518-135111a05bc6676275768abd3ec6cb63846cb24e.tar.bz2
hopefully fixes dma issues seen on ethernet driver when under high load
SVN-Revision: 18203
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/files/drivers/net/ramips.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/target/linux/ramips/files/drivers/net/ramips.c b/target/linux/ramips/files/drivers/net/ramips.c
index 7168f18..b1cc550 100644
--- a/target/linux/ramips/files/drivers/net/ramips.c
+++ b/target/linux/ramips/files/drivers/net/ramips.c
@@ -147,6 +147,8 @@ ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
unsigned long tx;
unsigned int tx_next;
unsigned int mapped_addr;
+
+
if(priv->plat->min_pkt_len)
{
if(skb->len < priv->plat->min_pkt_len)
@@ -169,9 +171,9 @@ ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
tx_next = 0;
else
tx_next = tx + 1;
- if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
+ if((priv->tx_skb[tx] == 0) && (priv->tx_skb[tx_next] == 0))
{
- if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
+ if(!(priv->tx[tx].txd2 & TX_DMA_DONE) || !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
{
kfree_skb(skb);
dev->stats.tx_dropped++;
@@ -181,10 +183,12 @@ ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
priv->tx[tx].txd1 = virt_to_phys(skb->data);
priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
+ wmb();
ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
priv->tx_skb[tx] = skb;
+ wmb();
ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
} else {
dev->stats.tx_dropped++;
@@ -228,6 +232,7 @@ ramips_eth_rx_hw(unsigned long ptr)
dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
DMA_FROM_DEVICE);
priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
+ wmb();
ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
}
if(max_rx == 0)