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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>
This commit is contained in:
Menglong Dong 2022-03-04 14:00:46 +08:00 committed by David S. Miller
parent a568aff26a
commit 6c2728b7c1
3 changed files with 11 additions and 3 deletions
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5
include/linux/skbuff.h
View File

@ -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,
};

1
include/trace/events/skb.h
View File

@ -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

8
net/core/dev.c
View File

@ -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. :-)
*/