netdev - RE: [RFC 07/12] ravb: Fillup ravb_rx

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Date:   Wed, 6 Oct 2021 20:22:01 +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 07/12] ravb: Fillup ravb_rx_gbeth() stub

Hi Sergey,

Thanks for thefeedback.

> Subject: Re: [RFC 07/12] ravb: Fillup ravb_rx_gbeth() stub
> 
> On 10/5/21 2:06 PM, Biju Das wrote:
> 
> > Fillup ravb_rx_gbeth() function to support RZ/G2L.
> >
> > This patch also renames ravb_rcar_rx to ravb_rx_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>[...]
> > diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> > b/drivers/net/ethernet/renesas/ravb_main.c
> > index 37164a983156..42573eac82b9 100644
> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> > @@ -720,6 +720,23 @@ static void ravb_get_tx_tstamp(struct net_device
> *ndev)
> >  	}
> >  }
> >
> > +static void ravb_rx_csum_gbeth(struct sk_buff *skb) {
> > +	u8 *hw_csum;
> > +
> > +	/* The hardware checksum is contained in sizeof(__sum16) (2) bytes
> > +	 * appended to packet data
> > +	 */
> > +	if (unlikely(skb->len < sizeof(__sum16)))
> > +		return;
> > +	hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
> 
>    Not 32-bit? The manual says the IP checksum is stored in the first 2
> bytes.

It is 16 bit. It is on last 2 bytes.

> 
> > +
> > +	if (*hw_csum == 0)
> 
>    You only check the 1st byte, not the full checksum!

As I said earlier, "0" value on last 16 bit, means no checksum error.

> 
> > +		skb->ip_summed = CHECKSUM_UNNECESSARY;
> > +	else
> > +		skb->ip_summed = CHECKSUM_NONE;
> 
>   So the TCP/UDP/ICMP checksums are not dealt with? Why enable them then?

If last 2bytes is zero, means there is no checksum error w.r.to TCP/UDP/ICMP checksums.

RZ/G2L checksum part is different from R-Car Gen3. There is no TOE block at all for R-Car Gen3.

Regards,
Biju

> 
> > +}
> > +
> >  static void ravb_rx_csum(struct sk_buff *skb)
> 
> static void ravb_rx_csum_rcar(struct sk_buff *skb)?
> 
> [...]
> 
> MBR, Sergey