netdev - RE: [RFC 03/12] ravb: Fillup ravb_set_features

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Message-ID: <OS0PR01MB5922DBC6EF8E23340B47162686B39@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date:   Sat, 9 Oct 2021 17:53:29 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     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 03/12] ravb: Fillup ravb_set_features_gbeth() stub



> -----Original Message-----
> From: Biju Das <biju.das.jz@...renesas.com>
> Sent: 06 October 2021 08:44
> To: Sergey Shtylyov <s.shtylyov@....ru>; David S. Miller
> <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>
> Cc: 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: [RFC 03/12] ravb: Fillup ravb_set_features_gbeth() stub
> 
> Hi Sergei,
> 
> Thanks for the feedback.
> 
> > Subject: Re: [RFC 03/12] ravb: Fillup ravb_set_features_gbeth() stub
> >
> > On 10/5/21 2:06 PM, Biju Das wrote:
> >
> > > Fillup ravb_set_features_gbeth() function to support RZ/G2L.
> > > Also set the net_hw_features bits supported by GbEthernet
> > >
> > > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > [...]
> >
> > > diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> > > b/drivers/net/ethernet/renesas/ravb_main.c
> > > index ed0328a90200..37f50c041114 100644
> > > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> > [...]
> > > @@ -2086,7 +2087,37 @@ static void ravb_set_rx_csum(struct
> > > net_device *ndev, bool enable)  static int
> > > ravb_set_features_gbeth(struct
> > net_device *ndev,
> > >  				   netdev_features_t features)
> > >  {
> > > -	/* Place holder */
> > > +	netdev_features_t changed = features ^ ndev->features;
> > > +	int error;
> > > +	u32 csr0;
> > > +
> > > +	csr0 = ravb_read(ndev, CSR0);
> > > +	ravb_write(ndev, csr0 & ~(CSR0_RPE | CSR0_TPE), CSR0);
> > > +	error = ravb_wait(ndev, CSR0, CSR0_RPE | CSR0_TPE, 0);
> > > +	if (error) {
> > > +		ravb_write(ndev, csr0, CSR0);
> > > +		return error;
> > > +	}
> > > +
> > > +	if (changed & NETIF_F_RXCSUM) {
> > > +		if (features & NETIF_F_RXCSUM)
> > > +			ravb_write(ndev, CSR2_ALL, CSR2);
> > > +		else
> > > +			ravb_write(ndev, 0, CSR2);
> > > +	}
> > > +
> > > +	if (changed & NETIF_F_HW_CSUM) {
> > > +		if (features & NETIF_F_HW_CSUM) {
> > > +			ravb_write(ndev, CSR1_ALL, CSR1);
> > > +			ndev->features |= NETIF_F_CSUM_MASK;
> >
> >    Hm, the >linux/netdev_features.h> says those are contradictory to
> > have both NETIF_F_HW_CSUM and NETIF_F_CSUM_MASK set...
> 
> It is a mistake from my side, I am taking out this setting. Any way below
> code overrides it.
> This will answer all your comments below.

I am deferring this patch and will take out  RX checksum offload functionality from patch#7

Will post this 2 patches as RFC, as looks like it needs more discussions related to HW checksum.

Regards,
Biju

> 
> Regards,
> Biju
> 
> >
> > > +		} else {
> > > +			ravb_write(ndev, 0, CSR1);
> >
> >    No need to mask off the 'features' field?
> >
> > > +		}
> > > +	}
> > > +	ravb_write(ndev, csr0, CSR0);
> > > +
> > > +	ndev->features = features;
> >
> >    Mhm, doesn't that clear NETIF_F_CSUM_MASK?
> >
> > [...]
> >
> > MBR, Sergey