netdev - Re: [RFC/PATCH 05/18] ravb: Exclude gPTP feature support for RZ/G2L

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Date:   Thu, 23 Sep 2021 22:00:05 +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:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "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: [RFC/PATCH 05/18] ravb: Exclude gPTP feature support for RZ/G2L

On 9/23/21 5:08 PM, Biju Das wrote:

> R-Car supports gPTP feature whereas RZ/G2L does not support it.
> This patch excludes gtp feature support for RZ/G2L by enabling
> no_gptp feature bit.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> ---
>  drivers/net/ethernet/renesas/ravb_main.c | 46 ++++++++++++++----------
>  1 file changed, 28 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index d38fc33a8e93..8663d83507a0 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]
> @@ -953,7 +954,7 @@ static irqreturn_t ravb_interrupt(int irq, void *dev_id)
>  	}
>  
>  	/* gPTP interrupt status summary */
> -	if (iss & ISS_CGIS) {

   Isn't this bit always 0 on RZ/G2L?

> +	if (!info->no_gptp && (iss & ISS_CGIS)) {
>  		ravb_ptp_interrupt(ndev);
>  		result = IRQ_HANDLED;
>  	}
> @@ -1378,6 +1379,7 @@ static int ravb_get_ts_info(struct net_device *ndev,
>  			    struct ethtool_ts_info *info)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_hw_info *hw_info = priv->info;
>  
>  	info->so_timestamping =
>  		SOF_TIMESTAMPING_TX_SOFTWARE |
> @@ -1391,7 +1393,8 @@ static int ravb_get_ts_info(struct net_device *ndev,
>  		(1 << HWTSTAMP_FILTER_NONE) |
>  		(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
>  		(1 << HWTSTAMP_FILTER_ALL);
> -	info->phc_index = ptp_clock_index(priv->ptp.clock);
> +	if (!hw_info->no_gptp)
> +		info->phc_index = ptp_clock_index(priv->ptp.clock);
>  
>  	return 0;
>  }
> @@ -2116,6 +2119,7 @@ static const struct ravb_hw_info rgeth_hw_info = {
>  	.emac_init = ravb_rgeth_emac_init,
>  	.aligned_tx = 1,
>  	.tx_counters = 1,
> +	.no_gptp = 1,

   Mhm, I definitely don't like the way you "extend" the GbEthernet info structure. All the applicable flags
should be set in the last patch of the series, not amidst of it.

[...]

MBR, Sergey