From 135111a05bc6676275768abd3ec6cb63846cb24e Mon Sep 17 00:00:00 2001 From: John Crispin Date: Thu, 29 Oct 2009 12:51:45 +0000 Subject: [PATCH] hopefully fixes dma issues seen on ethernet driver when under high load SVN-Revision: 18203 --- target/linux/ramips/files/drivers/net/ramips.c | 9 +++++++-- 1 file 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 7168f18f66..b1cc5504d4 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) -- 2.30.2