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

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Message-ID: <63592646-7547-1a81-e6c3-5bac413cb94a@omp.ru>
Date:   Wed, 6 Oct 2021 22:38:55 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "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>, <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

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.

> +
> +	if (*hw_csum == 0)

   You only check the 1st byte, not the full checksum!

> +		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?

> +}
> +
>  static void ravb_rx_csum(struct sk_buff *skb)

static void ravb_rx_csum_rcar(struct sk_buff *skb)?

[...]

MBR, Sergey