diff options
| -rw-r--r-- | include/linux/skbuff.h | 6 | ||||
| -rw-r--r-- | include/trace/events/skb.h | 1 | ||||
| -rw-r--r-- | net/core/dev.c | 5 |
3 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 769d54ba2f3b..44ecbfff2b69 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -399,6 +399,12 @@ enum skb_drop_reason { * outputting (failed to enqueue to * current qdisc) */ + SKB_DROP_REASON_CPU_BACKLOG, /* failed to enqueue the skb to + * the per CPU backlog queue. This + * can be caused by backlog queue + * full (see netdev_max_backlog in + * net.rst) or RPS flow limit + */ SKB_DROP_REASON_MAX, }; diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h index dbf3e2e3c1b4..3bb90ca893ae 100644 --- a/include/trace/events/skb.h +++ b/include/trace/events/skb.h @@ -47,6 +47,7 @@ EM(SKB_DROP_REASON_NEIGH_DEAD, NEIGH_DEAD) \ EM(SKB_DROP_REASON_TC_EGRESS, TC_EGRESS) \ EM(SKB_DROP_REASON_QDISC_DROP, QDISC_DROP) \ + EM(SKB_DROP_REASON_CPU_BACKLOG, CPU_BACKLOG) \ EMe(SKB_DROP_REASON_MAX, MAX) #undef EM diff --git a/net/core/dev.c b/net/core/dev.c index e2c107643ee5..460ac941a631 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4570,10 +4570,12 @@ static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) static int enqueue_to_backlog(struct sk_buff *skb, int cpu, unsigned int *qtail) { + enum skb_drop_reason reason; struct softnet_data *sd; unsigned long flags; unsigned int qlen; + reason = SKB_DROP_REASON_NOT_SPECIFIED; sd = &per_cpu(softnet_data, cpu); rps_lock_irqsave(sd, &flags); @@ -4596,13 +4598,14 @@ enqueue: napi_schedule_rps(sd); goto enqueue; } + reason = SKB_DROP_REASON_CPU_BACKLOG; drop: sd->dropped++; rps_unlock_irq_restore(sd, &flags); atomic_long_inc(&skb->dev->rx_dropped); - kfree_skb(skb); + kfree_skb_reason(skb, reason); return NET_RX_DROP; } |