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forcedeth: optimize the rx with likely 

In the rx fastpath, the function netdev_alloc_skb rarely fails.
Therefore, a likely() optimization is added to this error check
conditional.

CC: Srinivas Eeda <srinivas.eeda@oracle.com>
CC: Joe Jin <joe.jin@oracle.com>
CC: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zhu Yanjun 2017-12-26 01:22:50 -05:00 committed by David S. Miller
parent d36f45e5b4
commit ac0b715eab
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/nvidia/forcedeth.c
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@ -1817,7 +1817,7 @@ static int nv_alloc_rx(struct net_device *dev)
while (np->put_rx.orig != less_rx) {
struct sk_buff *skb = netdev_alloc_skb(dev, np->rx_buf_sz + NV_RX_ALLOC_PAD);
if (skb) {
if (likely(skb)) {
np->put_rx_ctx->skb = skb;
np->put_rx_ctx->dma = dma_map_single(&np->pci_dev->dev,
skb->data,
@ -1858,7 +1858,7 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
while (np->put_rx.ex != less_rx) {
struct sk_buff *skb = netdev_alloc_skb(dev, np->rx_buf_sz + NV_RX_ALLOC_PAD);
if (skb) {
if (likely(skb)) {
np->put_rx_ctx->skb = skb;
np->put_rx_ctx->dma = dma_map_single(&np->pci_dev->dev,
skb->data,