netdev - Re: [PATCH net-next 11/18] ravb: Factorise ravb_ring

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Message-ID: <a6728580-11d9-64f5-4c95-32a5a01379ac@gmail.com>
Date:   Thu, 29 Jul 2021 21:53:51 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.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>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next 11/18] ravb: Factorise ravb_ring_init function

On 7/22/21 5:13 PM, Biju Das wrote:

> The ravb_ring_init function uses extended descriptor in rx for
> R-Car and normal descriptor for RZ/G2L. Factorise rx ring buffer
> allocation so that it can support later SoC.

   In this case I think you factored out the function in question... but my ENglish is possibly
too weak. :-)

> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/net/ethernet/renesas/ravb.h      |  1 +
>  drivers/net/ethernet/renesas/ravb_main.c | 20 +++++++++++++++-----
>  2 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index a3258c5d0c3d..d82bfa6e57c1 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -991,6 +991,7 @@ enum ravb_chip_id {
>  struct ravb_ops {
>  	void (*ring_free)(struct net_device *ndev, int q);
>  	void (*ring_format)(struct net_device *ndev, int q);
> +	bool (*alloc_rx_desc)(struct net_device *ndev, int q);

  Aha, rx_ appears at last! :-)


> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index c23f0d420c70..3d0f6598b936 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -384,6 +384,19 @@ static void ravb_ring_format(struct net_device *ndev, int q)
>  }
>  
>  /* Init skb and descriptor buffer for Ethernet AVB */
> +static bool ravb_alloc_rx_desc(struct net_device *ndev, int q)

    Why *bool*? I think we shold just return a pointer allocated.

> +{
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	int ring_size;
> +
> +	ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
> +
> +	priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
> +					      &priv->rx_desc_dma[q],
> +					      GFP_KERNEL);
> +	return priv->rx_ring[q];
> +}
> +
>  static int ravb_ring_init(struct net_device *ndev, int q)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
> @@ -418,11 +431,7 @@ static int ravb_ring_init(struct net_device *ndev, int q)
>  	}
>  
>  	/* Allocate all RX descriptors. */
> -	ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
> -	priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
> -					      &priv->rx_desc_dma[q],
> -					      GFP_KERNEL);
> -	if (!priv->rx_ring[q])
> +	if (!info->ravb_ops->alloc_rx_desc(ndev, q))
>  		goto error;
>  
>  	priv->dirty_rx[q] = 0;
> @@ -2008,6 +2017,7 @@ static int ravb_mdio_release(struct ravb_private *priv)
>  static const struct ravb_ops ravb_gen3_ops = {
>  	.ring_free = ravb_ring_free_rx,
>  	.ring_format = ravb_ring_format_rx,
> +	.alloc_rx_desc = ravb_alloc_rx_desc,
>  };
>  
>  static const struct ravb_drv_data ravb_gen3_data = {
>