ar71xx: fix up alignment handling

[openwrt.git] / target / linux / ar71xx / files / drivers / net / ag71xx / ag71xx_main.c

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index f4c5a12..a3b5f95 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -192,9 +192,28 @@ static void ag71xx_ring_rx_clean(struct ag71xx *ag)
                }
 }
 
+static int ag71xx_rx_reserve(struct ag71xx *ag)
+{
+       int reserve = 0;
+
+       if (ag71xx_get_pdata(ag)->is_ar724x) {
+               if (!ag71xx_has_ar8216(ag))
+                       reserve = 2;
+
+               if (ag->phy_dev)
+                       reserve += 4 - (ag->phy_dev->pkt_align % 4);
+
+               reserve %= 4;
+       }
+
+       return reserve + AG71XX_RX_PKT_RESERVE;
+}
+
+
 static int ag71xx_ring_rx_init(struct ag71xx *ag)
 {
        struct ag71xx_ring *ring = &ag->rx_ring;
+       unsigned int reserve = ag71xx_rx_reserve(ag);
        unsigned int i;
        int ret;
 
@@ -212,14 +231,14 @@ static int ag71xx_ring_rx_init(struct ag71xx *ag)
                struct sk_buff *skb;
                dma_addr_t dma_addr;
 
-               skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + AG71XX_RX_PKT_RESERVE);
+               skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
                if (!skb) {
                        ret = -ENOMEM;
                        break;
                }
 
                skb->dev = ag->dev;
-               skb_reserve(skb, AG71XX_RX_PKT_RESERVE);
+               skb_reserve(skb, reserve);
 
                dma_addr = dma_map_single(&ag->dev->dev, skb->data,
                                          AG71XX_RX_PKT_SIZE,
@@ -242,6 +261,7 @@ static int ag71xx_ring_rx_init(struct ag71xx *ag)
 static int ag71xx_ring_rx_refill(struct ag71xx *ag)
 {
        struct ag71xx_ring *ring = &ag->rx_ring;
+       unsigned int reserve = ag71xx_rx_reserve(ag);
        unsigned int count;
 
        count = 0;
@@ -254,12 +274,11 @@ static int ag71xx_ring_rx_refill(struct ag71xx *ag)
                        dma_addr_t dma_addr;
                        struct sk_buff *skb;
 
-                       skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE +
-                                           AG71XX_RX_PKT_RESERVE);
+                       skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE + reserve);
                        if (skb == NULL)
                                break;
 
-                       skb_reserve(skb, AG71XX_RX_PKT_RESERVE);
+                       skb_reserve(skb, reserve);
                        skb->dev = ag->dev;
 
                        dma_addr = dma_map_single(&ag->dev->dev, skb->data,
@@ -759,6 +778,28 @@ static int ag71xx_tx_packets(struct ag71xx *ag)
        return sent;
 }
 
+static void ag71xx_rx_align_skb(struct ag71xx *ag, struct sk_buff *skb, int len)
+{
+       int offset = ((unsigned long) skb->data) % 4;
+       void *data;
+
+       if (offset == 2)
+               return;
+
+       if (ag->phy_dev && ag->phy_dev->pkt_align != 0)
+               return;
+
+       if (len > 128)
+               return;
+
+       if (WARN_ON(skb_headroom(skb) < 2))
+               return;
+
+       data = skb->data;
+       skb->data -= 2;
+       memmove(skb->data, data, len);
+}
+
 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 {
        struct net_device *dev = ag->dev;
@@ -796,19 +837,24 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += pktlen;
 
+               skb_put(skb, pktlen);
                if (ag71xx_has_ar8216(ag))
-                       err = ag71xx_remove_ar8216_header(ag, skb);
+                       err = ag71xx_remove_ar8216_header(ag, skb, pktlen);
+
+               ag71xx_rx_align_skb(ag, skb, pktlen);
 
                if (err) {
                        dev->stats.rx_dropped++;
                        kfree_skb(skb);
                } else {
-                       skb_put(skb, pktlen);
-
                        skb->dev = dev;
                        skb->ip_summed = CHECKSUM_NONE;
-                       skb->protocol = eth_type_trans(skb, dev);
-                       netif_receive_skb(skb);
+                       if (ag->phy_dev) {
+                               ag->phy_dev->netif_receive_skb(skb);
+                       } else {
+                               skb->protocol = eth_type_trans(skb, dev);
+                               netif_receive_skb(skb);
+                       }
                }
 
                ring->buf[i].skb = NULL;