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authorLino Sanfilippo <LinoSanfilippo@gmx.de>2016-11-30 23:48:31 +0100
committerDavid S. Miller <davem@davemloft.net>2016-12-02 12:10:24 -0500
commit151a14db228181fb49abaf83e13f3be58ec102c4 (patch)
tree201e0a49903d5f373e65a28c5319681fff309c34 /drivers/net/ethernet/altera
parentd262fd12cd03afca40ced117d837fa576a667eab (diff)
downloadlinux-151a14db228181fb49abaf83e13f3be58ec102c4.tar.gz
net: ethernet: altera: TSE: Remove unneeded dma sync for tx buffers
An explicit dma sync for device directly after mapping as well as an explicit dma sync for cpu directly before unmapping is unnecessary and costly on the hotpath. So remove these calls. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/altera')
-rw-r--r--drivers/net/ethernet/altera/altera_tse_main.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c
index 6532829b70d2..28689092ff19 100644
--- a/drivers/net/ethernet/altera/altera_tse_main.c
+++ b/drivers/net/ethernet/altera/altera_tse_main.c
@@ -400,12 +400,6 @@ static int tse_rx(struct altera_tse_private *priv, int limit)
skb_put(skb, pktlength);
- /* make cache consistent with receive packet buffer */
- dma_sync_single_for_cpu(priv->device,
- priv->rx_ring[entry].dma_addr,
- priv->rx_ring[entry].len,
- DMA_FROM_DEVICE);
-
dma_unmap_single(priv->device, priv->rx_ring[entry].dma_addr,
priv->rx_ring[entry].len, DMA_FROM_DEVICE);
@@ -592,10 +586,6 @@ static int tse_start_xmit(struct sk_buff *skb, struct net_device *dev)
buffer->dma_addr = dma_addr;
buffer->len = nopaged_len;
- /* Push data out of the cache hierarchy into main memory */
- dma_sync_single_for_device(priv->device, buffer->dma_addr,
- buffer->len, DMA_TO_DEVICE);
-
priv->dmaops->tx_buffer(priv, buffer);
skb_tx_timestamp(skb);