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| author | John Crispin <john@openwrt.org> | 2009-10-29 12:51:45 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2009-10-29 12:51:45 +0000 |
| commit | 135111a05bc6676275768abd3ec6cb63846cb24e (patch) | |
| tree | 7ca3dc9134f5ce5390c47715c1c7c29a57f7cf03 /target/linux/ramips/files/drivers | |
| parent | 1a2862798a9302208de01c3b6a68740ddedbdea4 (diff) | |
| download | mtk-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/files/drivers')
| -rw-r--r-- | target/linux/ramips/files/drivers/net/ramips.c | 9 |
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) |