From 2e598af7135d1434b0ebf2e9c7ff8e014f48d572 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Fri, 5 Feb 2016 15:28:01 -0800 Subject: [PATCH] gre: Use GSO flags to determine csum need instead of GRE flags This patch updates the gre checksum path to follow something much closer to the UDP checksum path. By doing this we can avoid needing to do as much header inspection and can just make use of the fields we were already reading in the sk_buff structure. Signed-off-by: Alexander Duyck Signed-off-by: David S. Miller --- net/ipv4/gre_offload.c | 64 ++++++++++++++++++++---------------------- 1 file changed, 30 insertions(+), 34 deletions(-) diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c index 35a8dd35ed4e..c15441b5ff61 100644 --- a/net/ipv4/gre_offload.c +++ b/net/ipv4/gre_offload.c @@ -18,14 +18,14 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb, netdev_features_t features) { + int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb); struct sk_buff *segs = ERR_PTR(-EINVAL); - int ghl; struct gre_base_hdr *greh; u16 mac_offset = skb->mac_header; - int mac_len = skb->mac_len; __be16 protocol = skb->protocol; - int tnl_hlen; - bool csum; + u16 mac_len = skb->mac_len; + int gre_offset, outer_hlen; + bool need_csum; if (unlikely(skb_shinfo(skb)->gso_type & ~(SKB_GSO_TCPV4 | @@ -42,64 +42,60 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb, if (!skb->encapsulation) goto out; - if (unlikely(!pskb_may_pull(skb, sizeof(*greh)))) + if (unlikely(tnl_hlen < sizeof(struct gre_base_hdr))) goto out; - greh = (struct gre_base_hdr *)skb_transport_header(skb); - - ghl = skb_inner_mac_header(skb) - skb_transport_header(skb); - if (unlikely(ghl < sizeof(*greh))) + if (unlikely(!pskb_may_pull(skb, tnl_hlen))) goto out; - csum = !!(greh->flags & GRE_CSUM); - if (csum) - skb->encap_hdr_csum = 1; + greh = (struct gre_base_hdr *)skb_transport_header(skb); /* setup inner skb. */ skb->protocol = greh->protocol; skb->encapsulation = 0; - - if (unlikely(!pskb_may_pull(skb, ghl))) - goto out; - - __skb_pull(skb, ghl); + __skb_pull(skb, tnl_hlen); skb_reset_mac_header(skb); skb_set_network_header(skb, skb_inner_network_offset(skb)); skb->mac_len = skb_inner_network_offset(skb); + need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_GRE_CSUM); + skb->encap_hdr_csum = need_csum; + features &= skb->dev->hw_enc_features; /* segment inner packet. */ segs = skb_mac_gso_segment(skb, features); if (IS_ERR_OR_NULL(segs)) { - skb_gso_error_unwind(skb, protocol, ghl, mac_offset, mac_len); + skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset, + mac_len); goto out; } + outer_hlen = skb_tnl_header_len(skb); + gre_offset = outer_hlen - tnl_hlen; skb = segs; - tnl_hlen = skb_tnl_header_len(skb); do { - __skb_push(skb, ghl); - if (csum) { - __be32 *pcsum; - - skb_reset_transport_header(skb); - - greh = (struct gre_base_hdr *) - skb_transport_header(skb); - pcsum = (__be32 *)(greh + 1); - *pcsum = 0; - *(__sum16 *)pcsum = gso_make_checksum(skb, 0); - } - __skb_push(skb, tnl_hlen - ghl); + __be32 *pcsum; skb_reset_inner_headers(skb); skb->encapsulation = 1; - skb_reset_mac_header(skb); - skb_set_network_header(skb, mac_len); skb->mac_len = mac_len; skb->protocol = protocol; + + __skb_push(skb, outer_hlen); + skb_reset_mac_header(skb); + skb_set_network_header(skb, mac_len); + skb_set_transport_header(skb, gre_offset); + + if (!need_csum) + continue; + + greh = (struct gre_base_hdr *)skb_transport_header(skb); + pcsum = (__be32 *)(greh + 1); + + *pcsum = 0; + *(__sum16 *)pcsum = gso_make_checksum(skb, 0); } while ((skb = skb->next)); out: return segs; -- 2.30.2