From 8c3a897bfab10f68f90252440bb29e6749a7312a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 27 Oct 2013 18:18:16 -0700 Subject: [PATCH] inet: restore gso for vxlan Alexei reported a performance regression on vxlan, caused by commit 3347c9602955 "ipv4: gso: make inet_gso_segment() stackable" GSO vxlan packets were not properly segmented, adding IP fragments while they were not expected. Rename 'bool tunnel' to 'bool encap', and add a new boolean to express the fact that UDP should be fragmented. This fragmentation is triggered by skb->encapsulation being set. Remove a "skb->encapsulation = 1" added in above commit, as its not needed, as frags inherit skb->frag from original GSO skb. Reported-by: Alexei Starovoitov Signed-off-by: Eric Dumazet Tested-by: Alexei Starovoitov Signed-off-by: David S. Miller --- net/ipv4/af_inet.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index f4a159e705c0..09d78d4a3cff 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1251,8 +1251,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, struct sk_buff *segs = ERR_PTR(-EINVAL); const struct net_offload *ops; unsigned int offset = 0; + bool udpfrag, encap; struct iphdr *iph; - bool tunnel; int proto; int nhoff; int ihl; @@ -1290,8 +1290,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, goto out; __skb_pull(skb, ihl); - tunnel = SKB_GSO_CB(skb)->encap_level > 0; - if (tunnel) + encap = SKB_GSO_CB(skb)->encap_level > 0; + if (encap) features = skb->dev->hw_enc_features & netif_skb_features(skb); SKB_GSO_CB(skb)->encap_level += ihl; @@ -1306,24 +1306,23 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, if (IS_ERR_OR_NULL(segs)) goto out; + udpfrag = !!skb->encapsulation && proto == IPPROTO_UDP; skb = segs; do { iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); - if (!tunnel && proto == IPPROTO_UDP) { + if (udpfrag) { iph->id = htons(id); iph->frag_off = htons(offset >> 3); if (skb->next != NULL) iph->frag_off |= htons(IP_MF); offset += skb->len - nhoff - ihl; - } else { + } else { iph->id = htons(id++); } iph->tot_len = htons(skb->len - nhoff); ip_send_check(iph); - if (tunnel) { + if (encap) skb_reset_inner_headers(skb); - skb->encapsulation = 1; - } skb->network_header = (u8 *)iph - skb->head; } while ((skb = skb->next)); -- 2.30.2