From 9a6d276e85aa3d8f308fc5e8de6892daeb60ae5f Mon Sep 17 00:00:00 2001 From: Neil Horman Date: Wed, 16 Jul 2008 20:50:49 -0700 Subject: [PATCH] core: add stat to track unresolved discards in neighbor cache in __neigh_event_send, if we have a neighbour entry which is in NUD_INCOMPLETE state, we enqueue any outbound frames to that neighbour to the neighbours arp_queue, which is default capped to a length of 3 skbs. If that queue exceeds its set length, it will drop an skb on the queue to enqueue the newly arrived skb. This results in a drop for which we have no statistics incremented. This patch adds an unresolved_discards stat to /proc/net/stat/ndisc_cache to track these lost frames. Signed-off-by: Neil Horman Signed-off-by: David S. Miller --- include/net/neighbour.h | 4 +++- net/core/neighbour.c | 8 +++++--- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/include/net/neighbour.h b/include/net/neighbour.h index dc420fecafb..aa4b708654a 100644 --- a/include/net/neighbour.h +++ b/include/net/neighbour.h @@ -75,7 +75,7 @@ struct neigh_statistics unsigned long destroys; /* number of destroyed neighs */ unsigned long hash_grows; /* number of hash resizes */ - unsigned long res_failed; /* nomber of failed resolutions */ + unsigned long res_failed; /* number of failed resolutions */ unsigned long lookups; /* number of lookups */ unsigned long hits; /* number of hits (among lookups) */ @@ -85,6 +85,8 @@ struct neigh_statistics unsigned long periodic_gc_runs; /* number of periodic GC runs */ unsigned long forced_gc_runs; /* number of forced GC runs */ + + unsigned long unres_discards; /* number of unresolved drops */ }; #define NEIGH_CACHE_STAT_INC(tbl, field) \ diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 65f01f71b3f..f62c8af85d3 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -930,6 +930,7 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) buff = neigh->arp_queue.next; __skb_unlink(buff, &neigh->arp_queue); kfree_skb(buff); + NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); } __skb_queue_tail(&neigh->arp_queue, skb); } @@ -2462,12 +2463,12 @@ static int neigh_stat_seq_show(struct seq_file *seq, void *v) struct neigh_statistics *st = v; if (v == SEQ_START_TOKEN) { - seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs\n"); + seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs unresolved_discards\n"); return 0; } seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " - "%08lx %08lx %08lx %08lx\n", + "%08lx %08lx %08lx %08lx %08lx\n", atomic_read(&tbl->entries), st->allocs, @@ -2483,7 +2484,8 @@ static int neigh_stat_seq_show(struct seq_file *seq, void *v) st->rcv_probes_ucast, st->periodic_gc_runs, - st->forced_gc_runs + st->forced_gc_runs, + st->unres_discards ); return 0; -- 2.41.1