[PATCH net-next] bcm63xx_enet: add BQL support

[Sieng Piaw Liew]

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

Signed-off-by: Sieng Piaw Liew <liew.s.p...@gmail.com>
---
 drivers/net/ethernet/broadcom/bcm63xx_enet.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c 
b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
index b82b7805c36a..c1eba5fa3258 100644
--- 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);
@@ -1069,6 +1076,7 @@ static int bcm_enet_open(struct net_device *dev)
        else
                bcm_enet_adjust_link(dev);
 
+       netdev_reset_queue(dev);
        netif_start_queue(dev);
        return 0;
 
@@ -2246,6 +2254,7 @@ static int bcm_enetsw_open(struct net_device *dev)
                         ENETDMAC_IRMASK, priv->tx_chan);
 
        netif_carrier_on(dev);
+       netdev_reset_queue(dev);
        netif_start_queue(dev);
 
        /* apply override config for bypass_link ports here. */
-- 
2.17.1