netdev - RE: [PATCH net] net: renesas: rswitch: Fix timestamp feature after all descritors are used

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Date: Wed, 7 Jun 2023 06:57:57 +0000
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, "s.shtylyov@....ru"
	<s.shtylyov@....ru>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	Phong Hoang <phong.hoang.wz@...esas.com>
Subject: RE: [PATCH net] net: renesas: rswitch: Fix timestamp feature after
 all descritors are used

Hi,

> From: Yoshihiro Shimoda, Sent: Wednesday, June 7, 2023 3:44 PM
> Subject: [PATCH net] net: renesas: rswitch: Fix timestamp feature after all descritors are used

I'm afraid but this subject had typo... I'll submit v2 patch.

Best regards,
Yoshihiro Shimoda

> The timestamp descriptors were intended to act cyclically. Descriptors
> from index 0 through gq->ring_size - 1 contain actual information, and
> the last index (gq->ring_size) should have LINKFIX to indicate
> the first index 0 descriptor. However, thie LINKFIX value is missing,
> causing the timestamp feature to stop after all descriptors are used.
> To resolve this issue, set the LINKFIX to the timestamp descritors.
> 
> Reported-by: Phong Hoang <phong.hoang.wz@...esas.com>
> Fixes: 33f5d733b589 ("net: renesas: rswitch: Improve TX timestamp accuracy")
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  Since I got this report locally, I didn't add Closes: tag.
> 
>  drivers/net/ethernet/renesas/rswitch.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
> index aace87139cea..049adbf5a642 100644
> --- a/drivers/net/ethernet/renesas/rswitch.c
> +++ b/drivers/net/ethernet/renesas/rswitch.c
> @@ -420,7 +420,7 @@ static int rswitch_gwca_queue_format(struct net_device *ndev,
>  }
> 
>  static void rswitch_gwca_ts_queue_fill(struct rswitch_private *priv,
> -				       int start_index, int num)
> +				       int start_index, int num, bool last)
>  {
>  	struct rswitch_gwca_queue *gq = &priv->gwca.ts_queue;
>  	struct rswitch_ts_desc *desc;
> @@ -431,6 +431,12 @@ static void rswitch_gwca_ts_queue_fill(struct rswitch_private *priv,
>  		desc = &gq->ts_ring[index];
>  		desc->desc.die_dt = DT_FEMPTY_ND | DIE;
>  	}
> +
> +	if (last) {
> +		desc = &gq->ts_ring[gq->ring_size];
> +		rswitch_desc_set_dptr(&desc->desc, gq->ring_dma);
> +		desc->desc.die_dt = DT_LINKFIX;
> +	}
>  }
> 
>  static int rswitch_gwca_queue_ext_ts_fill(struct net_device *ndev,
> @@ -941,7 +947,7 @@ static void rswitch_ts(struct rswitch_private *priv)
>  	}
> 
>  	num = rswitch_get_num_cur_queues(gq);
> -	rswitch_gwca_ts_queue_fill(priv, gq->dirty, num);
> +	rswitch_gwca_ts_queue_fill(priv, gq->dirty, num, false);
>  	gq->dirty = rswitch_next_queue_index(gq, false, num);
>  }
> 
> @@ -1780,7 +1786,7 @@ static int rswitch_init(struct rswitch_private *priv)
>  	if (err < 0)
>  		goto err_ts_queue_alloc;
> 
> -	rswitch_gwca_ts_queue_fill(priv, 0, TS_RING_SIZE);
> +	rswitch_gwca_ts_queue_fill(priv, 0, TS_RING_SIZE, true);
>  	INIT_LIST_HEAD(&priv->gwca.ts_info_list);
> 
>  	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
> --
> 2.25.1