netdev - Re: [PATCH 07/10] ravb: Add tsrq to struct ravb_hw

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Date:   Mon, 4 Oct 2021 21:00:30 +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: [PATCH 07/10] ravb: Add tsrq to struct ravb_hw_info

On 10/1/21 6:06 PM, Biju Das wrote:

> R-Car AVB-DMAC has 4 Transmit start request queues, whereas
> RZ/G2L has only 1 Transmit start request queue.

   The TCCR bits are called transmit start request (queue 0/1), not transmit start request queue 0/1.
I think you've read too much value into them for what is just TX queue 0/1.

> Add a tsrq variable to struct ravb_hw_info to handle this
> difference.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> RFC->v1:
>  * Added tsrq variable instead of multi_tsrq feature bit.
> ---
>  drivers/net/ethernet/renesas/ravb.h      | 1 +
>  drivers/net/ethernet/renesas/ravb_main.c | 9 +++++++--
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index 9cd3a15743b4..c586070193ef 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -997,6 +997,7 @@ struct ravb_hw_info {
>  	netdev_features_t net_features;
>  	int stats_len;
>  	size_t max_rx_len;
> +	u32 tsrq;

   I'd call it 'tccr_value' instead.

>  	unsigned aligned_tx: 1;
>  
>  	/* hardware features */
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index ac141a491ca2..4784832bd93c 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -790,11 +790,13 @@ static void ravb_rcv_snd_enable(struct net_device *ndev)
>  /* function for waiting dma process finished */
>  static int ravb_stop_dma(struct net_device *ndev)
>  {
> +	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_hw_info *info = priv->info;
>  	int error;
>  
>  	/* Wait for stopping the hardware TX process */
> -	error = ravb_wait(ndev, TCCR,
> -			  TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
> +	error = ravb_wait(ndev, TCCR, info->tsrq, 0);
> +
>  	if (error)
>  		return error;
>  
> @@ -2128,6 +2130,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {
>  	.net_features = NETIF_F_RXCSUM,
>  	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
>  	.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
> +	.tsrq = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
>  	.internal_delay = 1,
>  	.tx_counters = 1,
>  	.multi_irqs = 1,
> @@ -2150,6 +2153,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = {
>  	.net_features = NETIF_F_RXCSUM,
>  	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
>  	.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
> +	.tsrq = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
>  	.aligned_tx = 1,
>  	.gptp = 1,
>  	.nc_queue = 1,
> @@ -2165,6 +2169,7 @@ static const struct ravb_hw_info gbeth_hw_info = {
>  	.dmac_init = ravb_dmac_init_gbeth,
>  	.emac_init = ravb_emac_init_gbeth,
>  	.max_rx_len = GBETH_RX_BUFF_MAX + RAVB_ALIGN - 1,
> +	.tsrq = TCCR_TSRQ0,
>  	.aligned_tx = 1,
>  	.tx_counters = 1,
>  };
> 

[...]

MBR, Sergey