netdev - Re: [RFC 04/12] ravb: Fillup ravb_alloc_rx_desc

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Date:   Tue, 5 Oct 2021 22:14:48 +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:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        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: [RFC 04/12] ravb: Fillup ravb_alloc_rx_desc_gbeth() stub

On 10/5/21 2:06 PM, Biju Das wrote:

> Fillup ravb_alloc_rx_desc_gbeth() function to support RZ/G2L.
> 
> This patch also renames ravb_alloc_rx_desc to ravb_alloc_rx_desc_rcar
> to be consistent with the naming convention used in sh_eth driver.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
[...]

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

[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 37f50c041114..31de4e544525 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]
> -static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
> +static void *ravb_alloc_rx_desc_rcar(struct net_device *ndev, int q)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	unsigned int ring_size;
> @@ -1085,16 +1092,25 @@ static int ravb_poll(struct napi_struct *napi, int budget)
>  	struct net_device *ndev = napi->dev;
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	const struct ravb_hw_info *info = priv->info;
> +	bool gptp = info->gptp || info->ccc_gac;
> +	struct ravb_rx_desc *desc;
>  	unsigned long flags;
>  	int q = napi - priv->napi;
>  	int mask = BIT(q);
>  	int quota = budget;
> +	unsigned int entry;
>  
> +	if (!gptp) {
> +		entry = priv->cur_rx[q] % priv->num_rx_ring[q];
> +		desc = &priv->gbeth_rx_ring[entry];
> +	}
>  	/* Processing RX Descriptor Ring */
>  	/* Clear RX interrupt */
>  	ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0);
> -	if (ravb_rx(ndev, &quota, q))
> -		goto out;
> +	if (gptp || desc->die_dt != DT_FEMPTY) {
> +		if (ravb_rx(ndev, &quota, q))
> +			goto out;
> +	}

   Not sure I understand this new logic around the ravb_rx() call, care to explain?

[...]

MBR, Sergey