netdev - Re: [PATCH 1/2] udp: fix gso

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Date:   Tue, 1 Oct 2019 08:12:16 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Josh Hunt <johunt@...mai.com>, David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>
Subject: Re: [PATCH 1/2] udp: fix gso_segs calculations

On Mon, Sep 30, 2019 at 7:51 PM Alexander Duyck
<alexander.duyck@...il.com> wrote:
>
> On Mon, Sep 30, 2019 at 3:15 PM Josh Hunt <johunt@...mai.com> wrote:
> >
> > Commit dfec0ee22c0a ("udp: Record gso_segs when supporting UDP segmentation offload")
> > added gso_segs calculation, but incorrectly got sizeof() the pointer and
> > not the underlying data type. It also does not account for v6 UDP GSO segs.
> >
> > Fixes: dfec0ee22c0a ("udp: Record gso_segs when supporting UDP segmentation offload")
> > Signed-off-by: Josh Hunt <johunt@...mai.com>
> > ---
> >  net/ipv4/udp.c | 2 +-
> >  net/ipv6/udp.c | 2 ++
> >  2 files changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> > index cf755156a684..be98d0b8f014 100644
> > --- a/net/ipv4/udp.c
> > +++ b/net/ipv4/udp.c
> > @@ -856,7 +856,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
> >
> >                 skb_shinfo(skb)->gso_size = cork->gso_size;
> >                 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
> > -               skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(uh),
> > +               skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(*uh),
> >                                                          cork->gso_size);
> >                 goto csum_partial;
> >         }
> > diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> > index aae4938f3dea..eb9a9934ac05 100644
> > --- a/net/ipv6/udp.c
> > +++ b/net/ipv6/udp.c
> > @@ -1143,6 +1143,8 @@ static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
> >
> >                 skb_shinfo(skb)->gso_size = cork->gso_size;
> >                 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
> > +               skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(*uh),
> > +                                                        cork->gso_size);
> >                 goto csum_partial;
> >         }
> >
>
> Fix looks good to me.
>
> You might also want to add the original commit since you are also
> addressing IPv6 changes which are unrelated to my commit that your
> referenced:
> Fixes: bec1f6f69736 ("udp: generate gso with UDP_SEGMENT")
>
> Reviewed-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>

If resending, please target net: [PATCH net v2]