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
[off-list ref] wrote:

quoted

@@ -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!