netdev - Re: [PATCH 5/5] udp: additional GRO support

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Date:	Sun, 22 Jun 2014 14:40:31 +0300
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 5/5] udp: additional GRO support

On Sat, Jun 21, 2014 at 2:38 AM, Tom Herbert <therbert@...gle.com> wrote:
> Implement GRO for UDPv6. Add UDP checksum verification in gro_receive
> for both UDP4 and UDP6 calling skb_gro_checksum_validate_zero_check.
> Also, remove check for CHECKSUM_COMPLETE in udp_gro_receive, any
> checksum type should be handled now.


[...]

> diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
> index fb8e6ba..2ab9051 100644
> --- a/net/ipv4/udp_offload.c
> +++ b/net/ipv4/udp_offload.c

> -static struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
> +struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
> +                                struct udphdr *uh)
>  {
>         struct udp_offload_priv *uo_priv;
>         struct sk_buff *p, **pp = NULL;
> -       struct udphdr *uh, *uh2;
> -       unsigned int hlen, off;
> +       struct udphdr *uh2;
> +       unsigned int off = skb_gro_offset(skb);
>         int flush = 1;
>
> -       if (NAPI_GRO_CB(skb)->udp_mark ||
> -           (!skb->encapsulation && skb->ip_summed != CHECKSUM_COMPLETE))
> +       if (NAPI_GRO_CB(skb)->udp_mark)
>                 goto out;

Before this change we were practically requiring SKBs to carry their
->encapsulation mark set but not any more.
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