netdev - Re: [PATCH net-next 1/2] ravb: Add Rx checksum offload support

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Date: Tue, 23 Jan 2024 17:09:21 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Sergey Shtylyov
 <s.shtylyov@....ru>, Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, Wolfram Sang
 <wsa+renesas@...g-engineering.com>, Nikita Yushchenko
 <nikita.yoush@...entembedded.com>, netdev@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, Geert Uytterhoeven
 <geert+renesas@...der.be>, Prabhakar Mahadev Lad
 <prabhakar.mahadev-lad.rj@...renesas.com>, Biju Das <biju.das.au@...il.com>
Subject: Re: [PATCH net-next 1/2] ravb: Add Rx checksum offload support

On Tue, 23 Jan 2024 15:19:23 +0000 Biju Das wrote:
> +static void ravb_rx_csum_gbeth(struct sk_buff *skb)
> +{
> +	__sum16 csum_ip_hdr, csum_proto;
> +	u8 *hw_csum;
> +
> +	/* The hardware checksum status is contained in sizeof(__sum16) * 2 = 4
> +	 * bytes appended to packet data. First 2 bytes is ip header csum and
> +	 * last 2 bytes is protocol csum.
> +	 */
> +	if (unlikely(skb->len < sizeof(__sum16) * 2))
> +		return;
> +
> +	hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
> +	csum_proto = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
> +
> +	hw_csum -= sizeof(__sum16);
> +	csum_ip_hdr = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
> +	skb_trim(skb, skb->len - 2 * sizeof(__sum16));
> +
> +	/* TODO: IPV6 Rx csum */
> +	if (skb->protocol == htons(ETH_P_IP) && csum_ip_hdr == TOE_RX_CSUM_OK &&
> +	    csum_proto == TOE_RX_CSUM_OK)
> +		/* Hardware validated our checksum */
> +		skb->ip_summed = CHECKSUM_UNNECESSARY;
> +}

sparse does not seem to be onboard:

drivers/net/ethernet/renesas/ravb_main.c:771:20: warning: incorrect type in assignment (different base types)
drivers/net/ethernet/renesas/ravb_main.c:771:20:    expected restricted __sum16 [usertype] csum_proto
drivers/net/ethernet/renesas/ravb_main.c:771:20:    got restricted __wsum
drivers/net/ethernet/renesas/ravb_main.c:774:21: warning: incorrect type in assignment (different base types)
drivers/net/ethernet/renesas/ravb_main.c:774:21:    expected restricted __sum16 [usertype] csum_ip_hdr
drivers/net/ethernet/renesas/ravb_main.c:774:21:    got restricted __wsum
-- 
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