target/linux/bcm63xx/patches-5.4/442-bcm63xx_enet-add_bql_support.patch

   1 From 3c0e8e1259d223a1493c47f7e277d05b93909b6b Mon Sep 17 00:00:00 2001
   2 From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
   3 Date: Mon, 2 Nov 2020 11:34:06 +0800
   4 Subject: [PATCH 1/2] bcm63xx: add BQL support
   5
   6 Add Byte Queue Limits support to reduce/remove bufferbloat in bcm63xx target.
   7
   8 Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
   9 ---
  10  bcm63xx_enet.c | 11 +++++++++++
  11  1 file changed, 11 insertions(+)
  12
  13 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  14 +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
  15 @@ -423,9 +423,11 @@ static int bcm_enet_tx_reclaim(struct ne
  16  {
  17         struct bcm_enet_priv *priv;
  18         int released;
  19 +       unsigned int bytes;
  20
  21         priv = netdev_priv(dev);
  22         released = 0;
  23 +       bytes = 0;
  24
  25         while (priv->tx_desc_count < priv->tx_ring_size) {
  26                 struct bcm_enet_desc *desc;
  27 @@ -461,10 +463,13 @@ static int bcm_enet_tx_reclaim(struct ne
  28                 if (desc->len_stat & DMADESC_UNDER_MASK)
  29                         dev->stats.tx_errors++;
  30
  31 +               bytes += skb->len;
  32                 dev_kfree_skb(skb);
  33                 released++;
  34         }
  35
  36 +       netdev_completed_queue(dev, released, bytes);
  37 +
  38         if (netif_queue_stopped(dev) && released)
  39                 netif_wake_queue(dev);
  40
  41 @@ -631,6 +636,8 @@ bcm_enet_start_xmit(struct sk_buff *skb,
  42         desc->len_stat = len_stat;
  43         wmb();
  44
  45 +       netdev_sent_queue(dev, skb->len);
  46 +
  47         /* kick tx dma */
  48         enet_dmac_writel(priv, priv->dma_chan_en_mask,
  49                                  ENETDMAC_CHANCFG, priv->tx_chan);
  50 @@ -1051,6 +1058,8 @@ static int bcm_enet_open(struct net_devi
  51         else
  52                 bcm_enet_adjust_link(dev);
  53
  54 +       netdev_reset_queue(dev);
  55 +
  56         netif_start_queue(dev);
  57         return 0;
  58
  59 @@ -2281,6 +2290,8 @@ static int bcm_enetsw_open(struct net_de
  60         enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
  61                          ENETDMAC_IRMASK, priv->tx_chan);
  62
  63 +       netdev_reset_queue(dev);
  64 +
  65         netif_carrier_on(dev);
  66         netif_start_queue(dev);
  67