netdev - Re: [PATCH RFC 5/5] udp: Support UDP fraglist GRO/GSO.

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Date:   Mon, 23 Sep 2019 09:01:13 -0400
From:   Willem de Bruijn <willemb@...gle.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: Re: [PATCH RFC 5/5] udp: Support UDP fraglist GRO/GSO.

On Fri, Sep 20, 2019 at 12:49 AM Steffen Klassert
<steffen.klassert@...unet.com> wrote:
>
> This patch extends UDP GRO to support fraglist GRO/GSO
> by using the previously introduced infrastructure.
> All UDP packets that are not targeted to a GRO capable
> UDP sockets are going to fraglist GRO now (local input
> and forward).
>
> Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>

> @@ -538,6 +579,15 @@ 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;
> +
> +               return 0;
> +       }
> +
>         if (uh->check)
>                 uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
>                                           iph->daddr, 0);
> diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
> index 435cfbadb6bd..8836f2b69ef3 100644
> --- a/net/ipv6/udp_offload.c
> +++ b/net/ipv6/udp_offload.c
> @@ -150,6 +150,15 @@ INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
>         const struct ipv6hdr *ipv6h = ipv6_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;
> +
> +               return 0;
> +       }
> +

This is the same logic as in udp4_gro_complete. Can it be deduplicated
in udp_gro_complete?

>         if (uh->check)
>                 uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
>                                           &ipv6h->daddr, 0);