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authorFan Du <fan.du@intel.com>2015-03-06 11:18:24 +0800
committerDavid S. Miller <davem@davemloft.net>2015-03-06 14:57:42 -0500
commit05cbc0db03e82128f2e7e353d4194dd24a1627fe (patch)
tree33c79cec0d026feb0435042794ca4c4ef9e556ce /net/ipv4/tcp_timer.c
parentipv4: Use binary search to choose tcp PMTU probe_size (diff)
downloadlinux-dev-05cbc0db03e82128f2e7e353d4194dd24a1627fe.tar.xz
linux-dev-05cbc0db03e82128f2e7e353d4194dd24a1627fe.zip
ipv4: Create probe timer for tcp PMTU as per RFC4821
As per RFC4821 7.3. Selecting Probe Size, a probe timer should be armed once probing has converged. Once this timer expired, probing again to take advantage of any path PMTU change. The recommended probing interval is 10 minutes per RFC1981. Probing interval could be sysctled by sysctl_tcp_probe_interval. Eric Dumazet suggested to implement pseudo timer based on 32bits jiffies tcp_time_stamp instead of using classic timer for such rare event. Signed-off-by: Fan Du <fan.du@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/tcp_timer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 0732b787904e..15505936511d 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -107,6 +107,7 @@ static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)
if (net->ipv4.sysctl_tcp_mtu_probing) {
if (!icsk->icsk_mtup.enabled) {
icsk->icsk_mtup.enabled = 1;
+ icsk->icsk_mtup.probe_timestamp = tcp_time_stamp;
tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
} else {
struct net *net = sock_net(sk);