fixes rx path for eth, spinlock it, increases buffer size, board now survives ping -f

SVN-Revision: 18212

diff --git a/target/linux/ramips/files/drivers/net/ramips.c b/target/linux/ramips/files/drivers/net/ramips.c
index b1cc5504d4fc83fbf01d667eeb74b881cfca7065..e78eb6f8d74b8e699d2cf56562f0fce0609061cc 100644 (file)
--- a/target/linux/ramips/files/drivers/net/ramips.c
+++ b/target/linux/ramips/files/drivers/net/ramips.c
@@ -28,7 +28,7 @@
 #include "ramips_eth.h"
 
 #define TX_TIMEOUT (20 * HZ / 100)
-#define        MAX_RX_LENGTH   1500
+#define        MAX_RX_LENGTH   1600
 
 #ifdef CONFIG_RALINK_RT305X
 #include "ramips_esw.c"
@@ -147,7 +147,7 @@ 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)
        {
@@ -166,35 +166,30 @@ 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);
        tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
        if(tx == NUM_TX_DESC - 1)
                tx_next = 0;
        else
                tx_next = tx + 1;
-       if((priv->tx_skb[tx] == 0) && (priv->tx_skb[tx_next] == 0))
-       {
-               if(!(priv->tx[tx].txd2 & TX_DMA_DONE) || !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
-               {
-                       kfree_skb(skb);
-                       dev->stats.tx_dropped++;
-                       printk(KERN_ERR "%s: dropping\n", dev->name);
-                       return 0;
-               }
-               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++;
-               kfree_skb(skb);
-       }
-       return 0;
+       if((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
+               !(priv->tx[tx].txd2 & TX_DMA_DONE) || !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
+               goto out;
+       priv->tx[tx].txd1 = mapped_addr;
+       priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
+       priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
+       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);
+       spin_unlock_irqrestore(&priv->page_lock, flags);
+       return NETDEV_TX_OK;
+out:
+       spin_unlock_irqrestore(&priv->page_lock, flags);
+       dev->stats.tx_dropped++;
+       kfree_skb(skb);
+       return NETDEV_TX_OK;
 }
 
 static void
@@ -216,7 +211,6 @@ ramips_eth_rx_hw(unsigned long ptr)
 
                rx_skb = priv->rx_skb[rx];
                rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
-               rx_skb->tail = rx_skb->data + rx_skb->len;
                rx_skb->dev = dev;
                rx_skb->protocol = eth_type_trans(rx_skb, dev);
                rx_skb->ip_summed = CHECKSUM_NONE;
@@ -224,7 +218,7 @@ ramips_eth_rx_hw(unsigned long ptr)
                dev->stats.rx_bytes += rx_skb->len;
                netif_rx(rx_skb);
 
-               new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
+               new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
                priv->rx_skb[rx] = new_skb;
                BUG_ON(!new_skb);
                skb_reserve(new_skb, 2);
@@ -384,6 +378,7 @@ ramips_eth_probe(struct net_device *dev)
        dev->mtu = MAX_RX_LENGTH;
        dev->tx_timeout = ramips_eth_timeout;
        dev->watchdog_timeo = TX_TIMEOUT;
+       spin_lock_init(&priv->page_lock);
        return 0;
 }