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

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Date:   Wed, 6 Oct 2021 07:43:55 +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:     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

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.

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