netdev - Re: [PATCH net-next] bcm63xx

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Date:   Fri, 4 Dec 2020 10:27:50 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Sieng Piaw Liew <liew.s.piaw@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bcm63xx_enet: add BQL support



On 12/3/2020 9:46 PM, Sieng Piaw Liew wrote:
> Add Byte Queue Limits support to reduce/remove bufferbloat in
> bcm63xx_enet.
> 
> Signed-off-by: Sieng Piaw Liew <liew.s.piaw@...il.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);

Doing netdev_reset_queue() in bcm_enetsw_stop() and bcm_enet_stop()
would feel more natural and be consistent with where the resources are
being shut down. With that fixed:

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian