netdev - Re: [PATCH net-next 4/4] udp: Support UDP fraglist GRO/GSO.

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Message-ID: <20191219082602.GT8621@gauss3.secunet.de>
Date:   Thu, 19 Dec 2019 09:26:02 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
CC:     David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 4/4] udp: Support UDP fraglist GRO/GSO.

On Wed, Dec 18, 2019 at 11:03:09AM -0500, Willem de Bruijn wrote:
> On Wed, Dec 18, 2019 at 8:35 AM Steffen Klassert
> <steffen.klassert@...unet.com> wrote:
> 
> > @@ -544,6 +585,18 @@ INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
> >         const struct iphdr *iph = ip_hdr(skb);
> >         struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
> >
> > +       if (NAPI_GRO_CB(skb)->is_flist) {
> > +               uh->len = htons(skb->len - nhoff);
> > +
> > +               skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
> > +               skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
> > +
> > +               skb->ip_summed = CHECKSUM_UNNECESSARY;
> > +               skb->csum_level = ~0;
> 
> why is this needed for ipv4 only?

It is needed for IPv6 too, I've just forgot to add it there.

Thanks for the review!