target/linux/bcm63xx/patches-5.4/040-v5.12-bcm63xx_enet-batch-process-rx-path.patch

   1 From 9cbfea02c1dbee0afb9128f065e6e793672b9ff7 Mon Sep 17 00:00:00 2001
   2 From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
   3 Date: Wed, 6 Jan 2021 22:42:02 +0800
   4 Subject: [PATCH 1/7] bcm63xx_enet: batch process rx path
   5
   6 Use netif_receive_skb_list to batch process rx skb.
   7 Tested on BCM6328 320 MHz using iperf3 -M 512, increasing performance
   8 by 12.5%.
   9
  10 Before:
  11 [ ID] Interval           Transfer     Bandwidth       Retr
  12 [  4]   0.00-30.00  sec   120 MBytes  33.7 Mbits/sec  277         sender
  13 [  4]   0.00-30.00  sec   120 MBytes  33.5 Mbits/sec            receiver
  14
  15 After:
  16 [ ID] Interval           Transfer     Bandwidth       Retr
  17 [  4]   0.00-30.00  sec   136 MBytes  37.9 Mbits/sec  203         sender
  18 [  4]   0.00-30.00  sec   135 MBytes  37.7 Mbits/sec            receiver
  19
  20 Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
  21 Acked-by: Florian Fainelli <f.fainelli@gmail.com>
  22 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  23 ---
  24  drivers/net/ethernet/broadcom/bcm63xx_enet.c | 6 +++++-
  25  1 file changed, 5 insertions(+), 1 deletion(-)
  26
  27 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  28 +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  29 @@ -298,10 +298,12 @@ static void bcm_enet_refill_rx_timer(str
  30  static int bcm_enet_receive_queue(struct net_device *dev, int budget)
  31  {
  32         struct bcm_enet_priv *priv;
  33 +       struct list_head rx_list;
  34         struct device *kdev;
  35         int processed;
  36
  37         priv = netdev_priv(dev);
  38 +       INIT_LIST_HEAD(&rx_list);
  39         kdev = &priv->pdev->dev;
  40         processed = 0;
  41
  42 @@ -392,10 +394,12 @@ static int bcm_enet_receive_queue(struct
  43                 skb->protocol = eth_type_trans(skb, dev);
  44                 dev->stats.rx_packets++;
  45                 dev->stats.rx_bytes += len;
  46 -               netif_receive_skb(skb);
  47 +               list_add_tail(&skb->list, &rx_list);
  48
  49         } while (--budget > 0);
  50
  51 +       netif_receive_skb_list(&rx_list);
  52 +
  53         if (processed || !priv->rx_desc_count) {
  54                 bcm_enet_refill_rx(dev);
  55