bmips: improve rx loop

Use existing rx processed count to track against budget, thereby making
budget decrement operation redundant.
rx_desc_count can be calculated outside the rx loop, making the loop a
bit smaller.

Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>

diff --git a/target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c b/target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c
index 962f9ac887d1139f8e09ffebb8b8953212a08e56..04884a122d10d60c51b4f60bcb871d09a763367b 100644 (file)
--- a/target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c
+++ b/target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c
@@ -367,7 +367,6 @@ static int bcm6368_enetsw_receive_queue(struct net_device *dev, int budget)
                priv->rx_curr_desc++;
                if (priv->rx_curr_desc == priv->rx_ring_size)
                        priv->rx_curr_desc = 0;
-               priv->rx_desc_count--;
 
                /* if the packet does not have start of packet _and_
                 * end of packet flag set, then just recycle it */
@@ -420,7 +419,9 @@ static int bcm6368_enetsw_receive_queue(struct net_device *dev, int budget)
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += len;
                netif_receive_skb(skb);
-       } while (--budget > 0);
+       } while (processed < budget);
+
+       priv->rx_desc_count -= processed;
 
        if (processed || !priv->rx_desc_count) {
                bcm6368_enetsw_refill_rx(dev, true);