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

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Date:   Wed, 6 Oct 2021 06:50:52 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        "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" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...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

Hi Sergey,

> 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?

The code is simple.

If (gptp ||  --> means non gptp case that is Gbethernet
die_dt --> Descriptor thype

So basically the new logic is , on Gbethernet case, if descriptor is not empty, then process rx.

Regards,
Biju