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From 4c59b0f5543db80abbbe9efdd9b25e7899501db5 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:03 +0800
Subject: [PATCH 2/7] 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>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -418,9 +418,11 @@ static int bcm_enet_receive_queue(struct
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) {
@@ -457,10 +459,13 @@ static int bcm_enet_tx_reclaim(struct ne
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);
@@ -627,6 +632,8 @@ bcm_enet_start_xmit(struct sk_buff *skb,
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);
@@ -1170,6 +1177,7 @@ static int bcm_enet_stop(struct net_devi
kdev = &priv->pdev->dev;
netif_stop_queue(dev);
+ netdev_reset_queue(dev);
napi_disable(&priv->napi);
if (priv->has_phy)
phy_stop(dev->phydev);
@@ -2343,6 +2351,7 @@ static int bcm_enetsw_stop(struct net_de
del_timer_sync(&priv->swphy_poll);
netif_stop_queue(dev);
+ netdev_reset_queue(dev);
napi_disable(&priv->napi);
del_timer_sync(&priv->rx_timeout);
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