From d61d072e87c8ee4938b2517818e7b6498923d6a4 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 7 Nov 2016 11:12:27 -0800 Subject: [PATCH] net-gro: avoid reorders Receiving a GSO packet in dev_gro_receive() is not uncommon in stacked devices, or devices partially implementing LRO/GRO like bnx2x. GRO is implementing the aggregation the device was not able to do itself. Current code causes reorders, like in following case : For a given flow where sender sent 3 packets P1,P2,P3,P4 Receiver might receive P1 as a single packet, stored in GRO engine. Then P2-P4 are received as a single GSO packet, immediately given to upper stack, while P1 is held in GRO engine. This patch will make sure P1 is given to upper stack, then P2-P4 immediately after. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/dev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 0260ad314506..c9837fa08dfc 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4482,7 +4482,7 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff if (!(skb->dev->features & NETIF_F_GRO)) goto normal; - if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad) + if (skb->csum_bad) goto normal; gro_list_prepare(napi, skb); @@ -4495,7 +4495,7 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff skb_set_network_header(skb, skb_gro_offset(skb)); skb_reset_mac_len(skb); NAPI_GRO_CB(skb)->same_flow = 0; - NAPI_GRO_CB(skb)->flush = 0; + NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); NAPI_GRO_CB(skb)->free = 0; NAPI_GRO_CB(skb)->encap_mark = 0; NAPI_GRO_CB(skb)->recursion_counter = 0; -- 2.20.1