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ipv4: Create probe timer for tcp PMTU as per RFC4821

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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>
This commit is contained in:
Fan Du
2015-03-06 11:18:24 +08:00
committed by David S. Miller
parent 6b58e0a5f3
commit 05cbc0db03
7 changed files with 51 additions and 2 deletions
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3
include/net/tcp.h
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@@ -67,6 +67,9 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
/* The least MTU to use for probing */
#define TCP_BASE_MSS 1024
/* probing interval, default to 10 minutes as per RFC4821 */
#define TCP_PROBE_INTERVAL 600
/* Specify interval when tcp mtu probing will stop */
#define TCP_PROBE_THRESHOLD 8