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

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Message-ID: <CA+FuTSedVCAUK3LBZXp31KaAcHNrsENLECSfqEyJr4adfe-55Q@mail.gmail.com>
Date:   Mon, 30 Sep 2019 11:32:06 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.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 Mon, Sep 30, 2019 at 2:30 AM Steffen Klassert
<steffen.klassert@...unet.com> wrote:
>
> On Mon, Sep 23, 2019 at 09:01:13AM -0400, Willem de Bruijn wrote:
> > 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?
>
> The code below would mess up the checksum then. We did not change
> the packets, so the checksum is still correct.

Uh, right, of course. I guess it's not enough code to create a
separate udp_gro_fraglist_complete helper for. Okay, never mind.

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