Commit fea1d5b1 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: send the next probe immediately once the last one is acked 



These is no need to wait for 'interval' period for the next probe
if the last probe is already acked in search state. The 'interval'
period waiting should be only for probe failure timeout and the
current pmtu check when it's in search complete state.

This change will shorten the probe time a lot in search state, and
also fix the document accordingly.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0dac127c

Documentation/networking/ip-sysctl.rst

+8 −4
Original line number Diff line number Diff line
@@ -2835,10 +2835,14 @@ encap_port - INTEGER 
	Default: 0



plpmtud_probe_interval - INTEGER

        The time interval (in milliseconds) for sending PLPMTUD probe chunks.

        These chunks are sent at the specified interval with a variable size

        to probe the mtu of a given path between 2 endpoints. PLPMTUD will

        be disabled when 0 is set, and other values for it must be >= 5000.

        The time interval (in milliseconds) for the PLPMTUD probe timer,

        which is configured to expire after this period to receive an

        acknowledgment to a probe packet. This is also the time interval

        between the probes for the current pmtu when the probe search

        is done.



        PLPMTUD will be disabled when 0 is set, and other values for it

        must be >= 5000.



	Default: 0

net/sctp/sm_statefuns.c

+4 −1
Original line number Diff line number Diff line
@@ -1275,7 +1275,10 @@ enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, 
			return SCTP_DISPOSITION_DISCARD;



		sctp_transport_pl_recv(link);

		if (link->pl.state == SCTP_PL_COMPLETE)

			return SCTP_DISPOSITION_CONSUME;



		return sctp_sf_send_probe(net, ep, asoc, type, link, commands);

	}



	max_interval = link->hbinterval + link->rto;