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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-05 01:53:40 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:56:34 -0800
commita59322be07c964e916d15be3df473fb7ba20c41e (patch)
tree16d4caa41c1fd6c3fb907ce792202b157e6c9a1e /net/ipv6/udp.c
parent1781f7f5804e52ee2d35328b129602146a8d8254 (diff)
downloadlinux-2.6.38-lt-ux500-a59322be07c964e916d15be3df473fb7ba20c41e.tar.gz
[UDP]: Only increment counter on first peek/recv
The previous move of the the UDP inDatagrams counter caused each peek of the same packet to be counted separately. This may be undesirable. This patch fixes this by adding a bit to sk_buff to record whether this packet has already been seen through skb_recv_datagram. We then only increment the counter when the packet is seen for the first time. The only dodgy part is the fact that skb_recv_datagram doesn't have a good way of returning this new bit of information. So I've added a new function __skb_recv_datagram that does return this and made skb_recv_datagram a wrapper around it. The plan is to eventually replace all uses of skb_recv_datagram with this new function at which time it can be renamed its proper name. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 36bdcd2e1b5..fa640765385 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -123,6 +123,7 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
struct inet_sock *inet = inet_sk(sk);
struct sk_buff *skb;
unsigned int ulen, copied;
+ int peeked;
int err;
int is_udplite = IS_UDPLITE(sk);
@@ -133,7 +134,8 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
return ipv6_recv_error(sk, msg, len);
try_again:
- skb = skb_recv_datagram(sk, flags, noblock, &err);
+ skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
+ &peeked, &err);
if (!skb)
goto out;
@@ -166,7 +168,8 @@ try_again:
if (err)
goto out_free;
- UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
+ if (!peeked)
+ UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
sock_recv_timestamp(msg, sk, skb);