[PATCH 10/13] net: Prepare gro for packet consuming gro callbacks

[Steffen Klassert]

The upcomming IPsec ESP gro callbacks will consume the skb,
so prepare for that.

Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 include/linux/netdevice.h | 9 +++++++++
 net/core/dev.c            | 7 +++++++
 net/xfrm/Kconfig          | 4 ++++
 3 files changed, 20 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f9da3ac..9e5d1cd 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -352,6 +352,7 @@ enum gro_result {
        GRO_HELD,
        GRO_NORMAL,
        GRO_DROP,
+       GRO_CONSUMED,
 };
 typedef enum gro_result gro_result_t;
 
@@ -2661,10 +2662,18 @@ static inline void skb_gro_remcsum_cleanup(struct 
sk_buff *skb,
        remcsum_unadjust((__sum16 *)ptr, grc->delta);
 }
 
+#ifdef CONFIG_XFRM_OFFLOAD
+static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff 
**pp, int flush)
+{
+       if (PTR_ERR(pp) != -EINPROGRESS)
+               NAPI_GRO_CB(skb)->flush |= flush;
+}
+#else
 static inline void skb_gro_flush_final(struct sk_buff *skb, struct sk_buff 
**pp, int flush)
 {
        NAPI_GRO_CB(skb)->flush |= flush;
 }
+#endif
 
 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
                                  unsigned short type,
diff --git a/net/core/dev.c b/net/core/dev.c
index 3e1a601..64efbb9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4505,6 +4505,11 @@ static enum gro_result dev_gro_receive(struct 
napi_struct *napi, struct sk_buff
        if (&ptype->list == head)
                goto normal;
 
+       if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) {
+               ret = GRO_CONSUMED;
+               goto ok;
+       }
+
        same_flow = NAPI_GRO_CB(skb)->same_flow;
        ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
 
@@ -4609,6 +4614,7 @@ static gro_result_t napi_skb_finish(gro_result_t ret, 
struct sk_buff *skb)
 
        case GRO_HELD:
        case GRO_MERGED:
+       case GRO_CONSUMED:
                break;
        }
 
@@ -4680,6 +4686,7 @@ static gro_result_t napi_frags_finish(struct napi_struct 
*napi,
                break;
 
        case GRO_MERGED:
+       case GRO_CONSUMED:
                break;
        }
 
diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
index bda1a13..a484451 100644
--- a/net/xfrm/Kconfig
+++ b/net/xfrm/Kconfig
@@ -5,6 +5,10 @@ config XFRM
        bool
        depends on NET
 
+config XFRM_OFFLOAD
+       bool
+       depends on XFRM
+
 config XFRM_ALGO
        tristate
        select XFRM
-- 
1.9.1