linux-kernel - Re: [PATCH net-next v2 3/6] bcm63xx_enet: add xmit

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Date:   Mon, 28 Dec 2020 12:40:24 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sieng Piaw Liew <liew.s.piaw@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 3/6] bcm63xx_enet: add xmit_more support

On Thu, 24 Dec 2020 22:24:18 +0800 Sieng Piaw Liew wrote:
> Support bulking hardware TX queue by using netdev_xmit_more().
> 
> Signed-off-by: Sieng Piaw Liew <liew.s.piaw@...il.com>
> ---
>  drivers/net/ethernet/broadcom/bcm63xx_enet.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> index 90f8214b4d22..452968f168ed 100644
> --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> @@ -633,14 +633,17 @@ bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  
>  	netdev_sent_queue(dev, skb->len);
>  
> -	/* kick tx dma */
> -	enet_dmac_writel(priv, priv->dma_chan_en_mask,
> -				 ENETDMAC_CHANCFG, priv->tx_chan);
> -
>  	/* stop queue if no more desc available */
>  	if (!priv->tx_desc_count)
>  		netif_stop_queue(dev);
>  
> +	/* kick tx dma */
> +        if (!netdev_xmit_more() || !priv->tx_desc_count)
> +                enet_dmac_writel(priv, priv->dma_chan_en_mask,
> +                                 ENETDMAC_CHANCFG, priv->tx_chan);
> +
> +
> +
>  	dev->stats.tx_bytes += skb->len;
>  	dev->stats.tx_packets++;
>  	ret = NETDEV_TX_OK;

Please address checkpatch --strict issues throughout the series:

ERROR: code indent should use tabs where possible
#31: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:641:
+        if (!netdev_xmit_more() || !priv->tx_desc_count)$

WARNING: please, no spaces at the start of a line
#31: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:641:
+        if (!netdev_xmit_more() || !priv->tx_desc_count)$

ERROR: code indent should use tabs where possible
#32: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:642:
+                enet_dmac_writel(priv, priv->dma_chan_en_mask,$

WARNING: please, no spaces at the start of a line
#32: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:642:
+                enet_dmac_writel(priv, priv->dma_chan_en_mask,$

ERROR: code indent should use tabs where possible
#33: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:643:
+                                 ENETDMAC_CHANCFG, priv->tx_chan);$

WARNING: please, no spaces at the start of a line
#33: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:643:
+                                 ENETDMAC_CHANCFG, priv->tx_chan);$

CHECK: Please don't use multiple blank lines
#35: FILE: drivers/net/ethernet/broadcom/bcm63xx_enet.c:645:
+
+