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authorRob Herring <rob.herring@calxeda.com>2012-11-05 06:22:24 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-07 03:51:14 -0500
commitef468d234753aff7afa96075d3be135b0df1ded0 (patch)
treed35fbd28b721184859eb2e754faf659fef491724 /drivers/net/ethernet/calxeda
parentnet: calxedaxgmac: rework transmit ring handling (diff)
downloadlinux-dev-ef468d234753aff7afa96075d3be135b0df1ded0.tar.xz
linux-dev-ef468d234753aff7afa96075d3be135b0df1ded0.zip
net: calxedaxgmac: ip align receive buffers
On gcc 4.7, we will get alignment traps in the ip stack if we don't align the ip headers on receive. The h/w can support this, so use ip aligned allocations. Cut down the unnecessary padding on the allocation. The buffer can start on any byte alignment, but the size including the begining offset must be 8 byte aligned. So the h/w buffer size must include the NET_IP_ALIGN offset. Thanks to Eric Dumazet for the initial patch highlighting the padding issues. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/calxeda')
-rw-r--r--drivers/net/ethernet/calxeda/xgmac.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 362b35ed850b..b407043ce9b0 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -665,6 +665,7 @@ static void xgmac_rx_refill(struct xgmac_priv *priv)
{
struct xgmac_dma_desc *p;
dma_addr_t paddr;
+ int bufsz = priv->dev->mtu + ETH_HLEN + ETH_FCS_LEN;
while (dma_ring_space(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ) > 1) {
int entry = priv->rx_head;
@@ -673,13 +674,13 @@ static void xgmac_rx_refill(struct xgmac_priv *priv)
p = priv->dma_rx + entry;
if (priv->rx_skbuff[entry] == NULL) {
- skb = netdev_alloc_skb(priv->dev, priv->dma_buf_sz);
+ skb = netdev_alloc_skb_ip_align(priv->dev, bufsz);
if (unlikely(skb == NULL))
break;
priv->rx_skbuff[entry] = skb;
paddr = dma_map_single(priv->device, skb->data,
- priv->dma_buf_sz, DMA_FROM_DEVICE);
+ bufsz, DMA_FROM_DEVICE);
desc_set_buf_addr(p, paddr, priv->dma_buf_sz);
}
@@ -703,10 +704,10 @@ static int xgmac_dma_desc_rings_init(struct net_device *dev)
unsigned int bfsize;
/* Set the Buffer size according to the MTU;
- * indeed, in case of jumbo we need to bump-up the buffer sizes.
+ * The total buffer size including any IP offset must be a multiple
+ * of 8 bytes.
*/
- bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN + 64,
- 64);
+ bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN, 8);
netdev_dbg(priv->dev, "mtu [%d] bfsize [%d]\n", dev->mtu, bfsize);