IPoIB: Add some likely/unlikely annotations in hot path

Signed-off-by: NEli Cohen <eli@dev.mellanox.co.il>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_ib.c

@@ -332,7 +332,7 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 	struct ipoib_tx_buf *tx_req;
 	dma_addr_t addr;
 
-	if (skb->len > dev->mtu + INFINIBAND_ALEN) {
+	if (unlikely(skb->len > dev->mtu + INFINIBAND_ALEN)) {
 		ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 			   skb->len, dev->mtu + INFINIBAND_ALEN);
 		++priv->stats.tx_dropped;

drivers/infiniband/ulp/ipoib/ipoib_main.c

@@ -620,7 +620,7 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct ipoib_neigh *neigh;
 	unsigned long flags;
 
-	if (!spin_trylock_irqsave(&priv->tx_lock, flags))
+	if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
 		return NETDEV_TX_LOCKED;
 
 	/*
@@ -633,7 +633,7 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_BUSY;
 	}
 
-	if (skb->dst && skb->dst->neighbour) {
+	if (likely(skb->dst && skb->dst->neighbour)) {
 		if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
 			ipoib_path_lookup(skb, dev);
 			goto out;