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net: ip_queue_rcv_skb() helper

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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>
This commit is contained in:
Eric Dumazet
2010-04-28 15:31:51 -07:00
committed by David S. Miller
parent 4b0b72f7dd
commit f84af32cbc
7 changed files with 22 additions and 4 deletions
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include/net/ip.h
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@@ -393,6 +393,7 @@ extern int ip_options_rcv_srr(struct sk_buff *skb);
* Functions provided by ip_sockglue.c
*/
extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
extern int ip_cmsg_send(struct net *net,
struct msghdr *msg, struct ipcm_cookie *ipc);