Commit 9fd1ff5d2ac7 ("udp: Support UDP fraglist GRO/GSO.") actually not only added a support for fraglisted UDP GRO, but also tweaked some logics the way that non-fraglisted UDP GRO started to work for forwarding too. Tests showed that currently forwarding and NATing of plain UDP GRO packets are performed fully correctly, regardless if the target netdevice has a support for hardware/driver GSO UDP L4 or not. Add the last element and allow to form plain UDP GRO packets if there is no socket -> we are on forwarding path.
Plain UDP GRO forwarding even shows better performance than fraglisted UDP GRO in some cases due to not wasting one skbuff_head per every segment. Signed-off-by: Alexander Lobakin <aloba...@pm.me> --- net/ipv4/udp_offload.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index ff39e94781bf..9d71df3d52ce 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -460,12 +460,13 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb, if (skb->dev->features & NETIF_F_GRO_FRAGLIST) NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled: 1; - if ((sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist) { + if (!sk || (sk && udp_sk(sk)->gro_enabled) || + NAPI_GRO_CB(skb)->is_flist) { pp = call_gro_receive(udp_gro_receive_segment, head, skb); return pp; } - if (!sk || NAPI_GRO_CB(skb)->encap_mark || + if (NAPI_GRO_CB(skb)->encap_mark || (skb->ip_summed != CHECKSUM_PARTIAL && NAPI_GRO_CB(skb)->csum_cnt == 0 && !NAPI_GRO_CB(skb)->csum_valid) || -- 2.30.0