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authorWillem de Bruijn <willemb@google.com>2015-05-12 18:56:50 +0300
committerDavid S. Miller <davem@davemloft.net>2015-05-13 22:43:00 +0300
commita9b6391814d5d6b8668fca2dace86949b7244e2e (patch)
tree69d0024af991cefa3620b31bdbb094fe42723b72 /net/packet
parent3b3a5b0aab5b9ad345d4beb9a364a7dd02c23d40 (diff)
downloadlinux-a9b6391814d5d6b8668fca2dace86949b7244e2e.tar.xz
packet: rollover statistics
Rollover indicates exceptional conditions. Export a counter to inform socket owners of this state. If no socket with sufficient room is found, rollover fails. Also count these events. Finally, also count when flows are rolled over early thanks to huge flow detection, to validate its correctness. Tested: Read counters in bench_rollover on all other tests in the patchset Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c19
-rw-r--r--net/packet/internal.h3
2 files changed, 21 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 8f0156b10f8d..31d58565726c 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1395,7 +1395,7 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
unsigned int num)
{
struct packet_sock *po, *po_next;
- unsigned int i, j, room;
+ unsigned int i, j, room = ROOM_NONE;
po = pkt_sk(f->arr[idx]);
@@ -1413,6 +1413,9 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
if (i != j)
po->rollover->sock = i;
+ atomic_long_inc(&po->rollover->num);
+ if (room == ROOM_LOW)
+ atomic_long_inc(&po->rollover->num_huge);
return i;
}
@@ -1420,6 +1423,7 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
i = 0;
} while (i != j);
+ atomic_long_inc(&po->rollover->num_failed);
return idx;
}
@@ -1554,6 +1558,9 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
if (!po->rollover)
return -ENOMEM;
+ atomic_long_set(&po->rollover->num, 0);
+ atomic_long_set(&po->rollover->num_huge, 0);
+ atomic_long_set(&po->rollover->num_failed, 0);
}
mutex_lock(&fanout_mutex);
@@ -3584,6 +3591,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
struct packet_sock *po = pkt_sk(sk);
void *data = &val;
union tpacket_stats_u st;
+ struct tpacket_rollover_stats rstats;
if (level != SOL_PACKET)
return -ENOPROTOOPT;
@@ -3659,6 +3667,15 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
((u32)po->fanout->flags << 24)) :
0);
break;
+ case PACKET_ROLLOVER_STATS:
+ if (!po->rollover)
+ return -EINVAL;
+ rstats.tp_all = atomic_long_read(&po->rollover->num);
+ rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
+ rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
+ data = &rstats;
+ lv = sizeof(rstats);
+ break;
case PACKET_TX_HAS_OFF:
val = po->tp_tx_has_off;
break;
diff --git a/net/packet/internal.h b/net/packet/internal.h
index a9d30a17c714..c035d263c1e8 100644
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -89,6 +89,9 @@ struct packet_fanout {
struct packet_rollover {
int sock;
+ atomic_long_t num;
+ atomic_long_t num_huge;
+ atomic_long_t num_failed;
#define ROLLOVER_HLEN (L1_CACHE_BYTES / sizeof(u32))
u32 history[ROLLOVER_HLEN] ____cacheline_aligned;
} ____cacheline_aligned_in_smp;