netdev - Re: [PATCH net-next 05/13] ravb: Factorise ravb_ring

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Date:   Wed, 25 Aug 2021 23:53:41 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Sergey Shtylyov <s.shtylyov@....ru>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Adam Ford <aford173@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [PATCH net-next 05/13] ravb: Factorise ravb_ring_free function

On 8/25/21 10:01 AM, Biju Das wrote:

> R-Car uses extended descriptor in RX, whereas RZ/G2L uses normal
> descriptor. Factorise ravb_ring_free function so that it can
> support later SoC.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index 209e030935aa..7cb30319524a 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
[...]
> index 883db1049882..dc388a32496a 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -216,31 +216,42 @@ static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
>  	return free_num;
>  }
>  
> +static void ravb_rx_ring_free(struct net_device *ndev, int q)
> +{
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	unsigned int ring_size;
> +	unsigned int i;
> +
> +	if (!priv->rx_ring[q])
> +		return;
> +
> +	for (i = 0; i < priv->num_rx_ring[q]; i++) {
> +		struct ravb_ex_rx_desc *desc = &priv->rx_ring[q][i];
> +
> +		if (!dma_mapping_error(ndev->dev.parent,
> +				       le32_to_cpu(desc->dptr)))
> +			dma_unmap_single(ndev->dev.parent,
> +					 le32_to_cpu(desc->dptr),
> +					 RX_BUF_SZ,
> +					 DMA_FROM_DEVICE);

   I think we could reflow this argument list, so that it takes less lines...

> +	}
> +	ring_size = sizeof(struct ravb_ex_rx_desc) *
> +		    (priv->num_rx_ring[q] + 1);

   Here as well...

[...]

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

MBR, Sergey