bcm63xx_enet: batch process rx path

Use netif_receive_skb_list to batch process rx skb.
Tested on BCM6328 320 MHz using iperf3 -M 512, increasing performance
by 12.5%.

Before:
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-30.00  sec   120 MBytes  33.7 Mbits/sec  277         sender
[  4]   0.00-30.00  sec   120 MBytes  33.5 Mbits/sec            receiver

After:
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-30.00  sec   136 MBytes  37.9 Mbits/sec  203         sender
[  4]   0.00-30.00  sec   135 MBytes  37.7 Mbits/sec            receiver

Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
index 916824cca3fda194c42fefec7f514ced1a060043..b82b7805c36a83b8752da8f71bb98b535c0c1ecb 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -297,10 +297,12 @@ static void bcm_enet_refill_rx_timer(struct timer_list *t)
 static int bcm_enet_receive_queue(struct net_device *dev, int budget)
 {
        struct bcm_enet_priv *priv;
+       struct list_head rx_list;
        struct device *kdev;
        int processed;
 
        priv = netdev_priv(dev);
+       INIT_LIST_HEAD(&rx_list);
        kdev = &priv->pdev->dev;
        processed = 0;
 
@@ -391,10 +393,12 @@ static int bcm_enet_receive_queue(struct net_device *dev, int budget)
                skb->protocol = eth_type_trans(skb, dev);
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += len;
-               netif_receive_skb(skb);
+               list_add_tail(&skb->list, &rx_list);
 
        } while (--budget > 0);
 
+       netif_receive_skb_list(&rx_list);
+
        if (processed || !priv->rx_desc_count) {
                bcm_enet_refill_rx(dev);