bcm63xx_enet: add BQL support

Add Byte Queue Limits support to reduce/remove bufferbloat in
bcm63xx_enet.

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 b82b780..90f8214 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -417,9 +417,11 @@ static int bcm_enet_receive_queue(struct net_device *dev, int budget)
 static int bcm_enet_tx_reclaim(struct net_device *dev, int force)
 {
        struct bcm_enet_priv *priv;
+       unsigned int bytes;
        int released;
 
        priv = netdev_priv(dev);
+       bytes = 0;
        released = 0;
 
        while (priv->tx_desc_count < priv->tx_ring_size) {
@@ -456,10 +458,13 @@ static int bcm_enet_tx_reclaim(struct net_device *dev, int force)
                if (desc->len_stat & DMADESC_UNDER_MASK)
                        dev->stats.tx_errors++;
 
+               bytes += skb->len;
                dev_kfree_skb(skb);
                released++;
        }
 
+       netdev_completed_queue(dev, released, bytes);
+
        if (netif_queue_stopped(dev) && released)
                netif_wake_queue(dev);
 
@@ -626,6 +631,8 @@ bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
        desc->len_stat = len_stat;
        wmb();
 
+       netdev_sent_queue(dev, skb->len);
+
        /* kick tx dma */
        enet_dmac_writel(priv, priv->dma_chan_en_mask,
                                 ENETDMAC_CHANCFG, priv->tx_chan);
@@ -1169,6 +1176,7 @@ static int bcm_enet_stop(struct net_device *dev)
        kdev = &priv->pdev->dev;
 
        netif_stop_queue(dev);
+       netdev_reset_queue(dev);
        napi_disable(&priv->napi);
        if (priv->has_phy)
                phy_stop(dev->phydev);
@@ -2338,6 +2346,7 @@ static int bcm_enetsw_stop(struct net_device *dev)
 
        del_timer_sync(&priv->swphy_poll);
        netif_stop_queue(dev);
+       netdev_reset_queue(dev);
        napi_disable(&priv->napi);
        del_timer_sync(&priv->rx_timeout);