netdev - Re: [PATCH net-next 12/18] ravb: Factorise {emac,dmac} init function

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Message-ID: <1bd80ea3-c216-a42a-c46c-0bb13173d793@gmail.com>
Date:   Mon, 2 Aug 2021 22:41:48 +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 12/18] ravb: Factorise {emac,dmac} init function

Hello!

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

> The R-Car AVB module has Magic packet detection, multiple irq's and
> timestamp enable features which is not present on RZ/G2L Gigabit
                                   ^ are

> Ethernet module. Factorise emac and dmac initialization function to
> support the later SoC.
> 
> 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      |  2 +
>  drivers/net/ethernet/renesas/ravb_main.c | 58 ++++++++++++++++--------
>  2 files changed, 40 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index d82bfa6e57c1..4d5910dcda86 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -992,6 +992,8 @@ 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);
> +	void (*emac_init)(struct net_device *ndev);
> +	void (*dmac_init)(struct net_device *ndev);
>  };
>  
>  struct ravb_drv_data {
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 3d0f6598b936..e200114376e4 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -454,7 +454,7 @@ static int ravb_ring_init(struct net_device *ndev, int q)
>  }
>  
>  /* E-MAC init function */
> -static void ravb_emac_init(struct net_device *ndev)
> +static void ravb_emac_init_ex(struct net_device *ndev)
>  {
>  	/* Receive frame limit set register */
>  	ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
> @@ -480,30 +480,19 @@ static void ravb_emac_init(struct net_device *ndev)
>  	ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
>  }
>  
> -/* Device init function for Ethernet AVB */

   Grr, this comment seems oudated...

> -static int ravb_dmac_init(struct net_device *ndev)
> +static void ravb_emac_init(struct net_device *ndev)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	const struct ravb_drv_data *info = priv->info;
> -	int error;
>  
> -	/* Set CONFIG mode */
> -	error = ravb_config(ndev);
> -	if (error)
> -		return error;
> -
> -	error = ravb_ring_init(ndev, RAVB_BE);
> -	if (error)
> -		return error;
> -	error = ravb_ring_init(ndev, RAVB_NC);
> -	if (error) {
> -		ravb_ring_free(ndev, RAVB_BE);
> -		return error;
> -	}
> +	info->ravb_ops->emac_init(ndev);
> +}

   The whole ravb_emac_init() now consists only of a single method call?
Why do we need it at all?

>  
> -	/* Descriptor format */
> -	ravb_ring_format(ndev, RAVB_BE);
> -	ravb_ring_format(ndev, RAVB_NC);
> +/* Device init function for Ethernet AVB */

   s/Device/DMAC/. Or this comment shouldn't have been moved.

> +static void ravb_dmac_init_ex(struct net_device *ndev)

   Please no _ex suffixes -- reminds me of Windoze too much. :-)

> +{
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_drv_data *info = priv->info;
>  
>  	/* Set AVB RX */
>  	ravb_write(ndev,
> @@ -530,6 +519,33 @@ static int ravb_dmac_init(struct net_device *ndev)
>  	ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
>  	/* Frame transmitted, timestamp FIFO updated */
>  	ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
> +}
> +
> +static int ravb_dmac_init(struct net_device *ndev)
> +{
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_drv_data *info = priv->info;
> +	int error;
> +
> +	/* Set CONFIG mode */
> +	error = ravb_config(ndev);
> +	if (error)
> +		return error;
> +
> +	error = ravb_ring_init(ndev, RAVB_BE);
> +	if (error)
> +		return error;
> +	error = ravb_ring_init(ndev, RAVB_NC);
> +	if (error) {
> +		ravb_ring_free(ndev, RAVB_BE);
> +		return error;
> +	}
> +
> +	/* Descriptor format */
> +	ravb_ring_format(ndev, RAVB_BE);
> +	ravb_ring_format(ndev, RAVB_NC);
> +
> +	info->ravb_ops->dmac_init(ndev);
>  
>  	/* Setting the control will start the AVB-DMAC process. */
>  	ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_OPERATION);
> @@ -2018,6 +2034,8 @@ 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,
> +	.emac_init = ravb_emac_init_ex,
> +	.dmac_init = ravb_dmac_init_ex,

   Hmm, why not also gen2?!

>  };
[...]

MBR, Sergei