netdev - Re: [RFC/PATCH 12/18] ravb: Add timestamp to struct ravb_hw

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Date:   Sat, 25 Sep 2021 23:52:31 +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 12/18] ravb: Add timestamp to struct ravb_hw_info

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

> R-Car AVB-DMAC supports timestamp feature.
> Add a timestamp hw feature bit to struct ravb_hw_info
> to add this feature only for R-Car.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> ---
>  drivers/net/ethernet/renesas/ravb.h      |  2 +
>  drivers/net/ethernet/renesas/ravb_main.c | 68 +++++++++++++++---------
>  2 files changed, 45 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index ab4909244276..2505de5d4a28 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -1034,6 +1034,7 @@ struct ravb_hw_info {
>  	unsigned mii_rgmii_selection:1;	/* E-MAC supports mii/rgmii selection */
>  	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
>  	unsigned rx_2k_buffers:1;	/* AVB-DMAC has Max 2K buf size on RX */
> +	unsigned timestamp:1;		/* AVB-DMAC has timestamp */

   Isn't this a matter of the gPTP support as well, i.e. no separate flag needed?

[...]
> @@ -1089,6 +1090,7 @@ struct ravb_private {
>  	unsigned int num_tx_desc;	/* TX descriptors per packet */
>  
>  	int duplex;
> +	struct ravb_rx_desc *rgeth_rx_ring[NUM_RX_QUEUE];

   Strange place to declare this...

>  
>  	const struct ravb_hw_info *info;
>  	struct reset_control *rstc;
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 9c0d35f4b221..2c375002ebcb 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -949,11 +949,14 @@ static bool ravb_queue_interrupt(struct net_device *ndev, int q)
>  
>  static bool ravb_timestamp_interrupt(struct net_device *ndev)
>  {
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_hw_info *info = priv->info;
>  	u32 tis = ravb_read(ndev, TIS);
>  
>  	if (tis & TIS_TFUF) {
>  		ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS);
> -		ravb_get_tx_tstamp(ndev);
> +		if (info->timestamp)
> +			ravb_get_tx_tstamp(ndev);

   Shouldn't we just disable TIS.TFUF permanently instead for the non-gPTP case?

[...]

MBR, Sergey