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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-04-28 15:31:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-28 15:31:51 -0700 |
| commit | f84af32cbca70a3c6d30463dc08c7984af11c277 (patch) | |
| tree | 06ede4b3ed91be899f8f29b4c7eb1fb76f1ade97 /net/ipv4/ip_sockglue.c | |
| parent | 4b0b72f7dd617b13abd1b04c947e15873e011a24 (diff) | |
| download | lwn-f84af32cbca70a3c6d30463dc08c7984af11c277.tar.gz lwn-f84af32cbca70a3c6d30463dc08c7984af11c277.zip | |
net: ip_queue_rcv_skb() helper
When queueing a skb to socket, we can immediately release its dst if
target socket do not use IP_CMSG_PKTINFO.
tcp_data_queue() can drop dst too.
This to benefit from a hot cache line and avoid the receiver, possibly
on another cpu, to dirty this cache line himself.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index b0aa0546a3b3..ce231780a2b1 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -954,6 +954,22 @@ e_inval: return -EINVAL; } +/** + * ip_queue_rcv_skb - Queue an skb into sock receive queue + * @sk: socket + * @skb: buffer + * + * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option + * is not set, we drop skb dst entry now, while dst cache line is hot. + */ +int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO)) + skb_dst_drop(skb); + return sock_queue_rcv_skb(sk, skb); +} +EXPORT_SYMBOL(ip_queue_rcv_skb); + int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen) { |