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| author | Neil Horman <nhorman@tuxdriver.com> | 2008-07-16 20:50:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-16 20:50:49 -0700 |
| commit | 9a6d276e85aa3d8f308fc5e8de6892daeb60ae5f (patch) | |
| tree | f61e1ad988a037745794fb23004d5bf2f247800f /net/core | |
| parent | ed88098e25d77bef3b2ad8c9d8e2ebf454d9ccbf (diff) | |
| download | op-kernel-dev-9a6d276e85aa3d8f308fc5e8de6892daeb60ae5f.zip op-kernel-dev-9a6d276e85aa3d8f308fc5e8de6892daeb60ae5f.tar.gz | |
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 <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/neighbour.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 65f01f7..f62c8af 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; |
