target/linux/bcm27xx/patches-5.4/950-0211-bcmgenet-Better-coalescing-parameter-defaults.patch

   1 From b3344ca9ef887c4004c61be39f7d8d058a569d4d Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Wed, 27 Mar 2019 13:45:46 +0000
   4 Subject: [PATCH] bcmgenet: Better coalescing parameter defaults
   5
   6 Set defaults for TX and RX packet coalescing to be equivalent to:
   7
   8   # ethtool -C eth0 tx-frames 10
   9   # ethtool -C eth0 rx-usecs 50
  10
  11 This may be something we want to set via DT parameters in the
  12 future.
  13
  14 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  15 ---
  16  drivers/net/ethernet/broadcom/genet/bcmgenet.c | 7 +++++--
  17  1 file changed, 5 insertions(+), 2 deletions(-)
  18
  19 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
  20 +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
  21 @@ -2148,7 +2148,7 @@ static void bcmgenet_init_tx_ring(struct
  22
  23         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_PROD_INDEX);
  24         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_CONS_INDEX);
  25 -       bcmgenet_tdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
  26 +       bcmgenet_tdma_ring_writel(priv, index, 10, DMA_MBUF_DONE_THRESH);
  27         /* Disable rate control for now */
  28         bcmgenet_tdma_ring_writel(priv, index, flow_period_val,
  29                                   TDMA_FLOW_PERIOD);
  30 @@ -3571,9 +3571,12 @@ static int bcmgenet_probe(struct platfor
  31         netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
  32
  33         /* Set default coalescing parameters */
  34 -       for (i = 0; i < priv->hw_params->rx_queues; i++)
  35 +       for (i = 0; i < priv->hw_params->rx_queues; i++) {
  36                 priv->rx_rings[i].rx_max_coalesced_frames = 1;
  37 +               priv->rx_rings[i].rx_coalesce_usecs = 50;
  38 +       }
  39         priv->rx_rings[DESC_INDEX].rx_max_coalesced_frames = 1;
  40 +       priv->rx_rings[DESC_INDEX].rx_coalesce_usecs = 50;
  41
  42         /* libphy will determine the link state */
  43         netif_carrier_off(dev);