[PATCH net-next 2/2] net-gro: remove GRO_DROP

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

GRO_DROP can only be returned from napi_gro_frags()
if the skb has not been allocated by a prior napi_get_frags()

Since drivers must use napi_get_frags() and test its result
before populating the skb with metadata, we can safely remove
GRO_DROP since it offers no practical use.

Signed-off-by: Eric Dumazet <eduma...@google.com>
Cc: Jesse Brandeburg <jesse.brandeb...@intel.com>
---
 include/linux/netdevice.h |  1 -
 net/core/dev.c            | 11 -----------
 2 files changed, 12 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 
1ec3ac5d5bbffe6062216fbd4009e88d8c909fa9..5b949076ed2319fc676a7172350480efea5807d9
 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -376,7 +376,6 @@ enum gro_result {
        GRO_MERGED_FREE,
        GRO_HELD,
        GRO_NORMAL,
-       GRO_DROP,
        GRO_CONSUMED,
 };
 typedef enum gro_result gro_result_t;
diff --git a/net/core/dev.c b/net/core/dev.c
index 
7afbb642e203ad1556e96e2fc7595b6289152201..e4d77c8abe761408caf3a0d1880727f33b5134b6
 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6070,10 +6070,6 @@ static gro_result_t napi_skb_finish(struct napi_struct 
*napi,
                gro_normal_one(napi, skb);
                break;
 
-       case GRO_DROP:
-               kfree_skb(skb);
-               break;
-
        case GRO_MERGED_FREE:
                if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
                        napi_skb_free_stolen_head(skb);
@@ -6158,10 +6154,6 @@ static gro_result_t napi_frags_finish(struct napi_struct 
*napi,
                        gro_normal_one(napi, skb);
                break;
 
-       case GRO_DROP:
-               napi_reuse_skb(napi, skb);
-               break;
-
        case GRO_MERGED_FREE:
                if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
                        napi_skb_free_stolen_head(skb);
@@ -6223,9 +6215,6 @@ gro_result_t napi_gro_frags(struct napi_struct *napi)
        gro_result_t ret;
        struct sk_buff *skb = napi_frags_skb(napi);
 
-       if (!skb)
-               return GRO_DROP;
-
        trace_napi_gro_frags_entry(skb);
 
        ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
-- 
2.29.2.729.g45daf8777d-goog