net: dev: use kfree_skb_reason() for __netif_receive_skb_core()

Add reason for skb drops to __netif_receive_skb_core() when packet_type
not found to handle the skb. For this purpose, the drop reason
SKB_DROP_REASON_PTYPE_ABSENT is introduced. Take ether packets for
example, this case mainly happens when L3 protocol is not supported.

Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6b14b2d..2be2631 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -407,6 +407,11 @@ enum skb_drop_reason {
                                         */
        SKB_DROP_REASON_XDP,            /* dropped by XDP in input path */
        SKB_DROP_REASON_TC_INGRESS,     /* dropped in TC ingress HOOK */
+       SKB_DROP_REASON_PTYPE_ABSENT,   /* not packet_type found to handle
+                                        * the skb. For an etner packet,
+                                        * this means that L3 protocol is
+                                        * not supported
+                                        */
        SKB_DROP_REASON_MAX,
 };
 

diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 514dd2d..c0769d9 100644 (file)
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -50,6 +50,7 @@
        EM(SKB_DROP_REASON_CPU_BACKLOG, CPU_BACKLOG)            \
        EM(SKB_DROP_REASON_XDP, XDP)                            \
        EM(SKB_DROP_REASON_TC_INGRESS, TC_INGRESS)              \
+       EM(SKB_DROP_REASON_PTYPE_ABSENT, PTYPE_ABSENT)          \
        EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM

diff --git a/net/core/dev.c b/net/core/dev.c
index ba7580c..ba69ddf 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5358,11 +5358,13 @@ check_vlan_id:
                *ppt_prev = pt_prev;
        } else {
 drop:
-               if (!deliver_exact)
+               if (!deliver_exact) {
                        atomic_long_inc(&skb->dev->rx_dropped);
-               else
+                       kfree_skb_reason(skb, SKB_DROP_REASON_PTYPE_ABSENT);
+               } else {
                        atomic_long_inc(&skb->dev->rx_nohandler);
-               kfree_skb(skb);
+                       kfree_skb(skb);
+               }
                /* Jamal, now you will not able to escape explaining
                 * me how you were going to use this. :-)
                 */