target/linux/bcm63xx/patches-5.10/026-v5.12-bcm63xx_enet-improve-rx-loop.patch

   1 From ae2259eebeacb7753e3043278957b45840123972 Mon Sep 17 00:00:00 2001
   2 From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
   3 Date: Wed, 6 Jan 2021 22:42:08 +0800
   4 Subject: [PATCH 7/7] bcm63xx_enet: improve rx loop
   5
   6 Use existing rx processed count to track against budget, thereby making
   7 budget decrement operation redundant.
   8
   9 rx_desc_count can be calculated outside the rx loop, making the loop a
  10 bit smaller.
  11
  12 Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
  13 Acked-by: Florian Fainelli <f.fainelli@gmail.com>
  14 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  15 ---
  16  drivers/net/ethernet/broadcom/bcm63xx_enet.c | 4 ++--
  17  1 file changed, 2 insertions(+), 2 deletions(-)
  18
  19 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  20 +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  21 @@ -339,7 +339,6 @@ static int bcm_enet_receive_queue(struct
  22                 priv->rx_curr_desc++;
  23                 if (priv->rx_curr_desc == priv->rx_ring_size)
  24                         priv->rx_curr_desc = 0;
  25 -               priv->rx_desc_count--;
  26
  27                 /* if the packet does not have start of packet _and_
  28                  * end of packet flag set, then just recycle it */
  29 @@ -404,9 +403,10 @@ static int bcm_enet_receive_queue(struct
  30                 dev->stats.rx_bytes += len;
  31                 list_add_tail(&skb->list, &rx_list);
  32
  33 -       } while (--budget > 0);
  34 +       } while (processed < budget);
  35
  36         netif_receive_skb_list(&rx_list);
  37 +       priv->rx_desc_count -= processed;
  38
  39         if (processed || !priv->rx_desc_count) {
  40                 bcm_enet_refill_rx(dev, true);