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authorXin Long <lucien.xin@gmail.com>2019-11-08 13:20:35 +0800
committerDavid S. Miller <davem@davemloft.net>2019-11-08 14:18:32 -0800
commit34515e94c92c3f593cd696abca8609246cbd75e6 (patch)
tree510f60292b4486bfe29e4f174629bae1cbcc25d3 /Documentation
parent8d2a6935d842f12c25611b165eace778adb09a53 (diff)
sctp: add support for Primary Path Switchover
This is a new feature defined in section 5 of rfc7829: "Primary Path Switchover". By introducing a new tunable parameter: Primary.Switchover.Max.Retrans (PSMR) The primary path will be changed to another active path when the path error counter on the old primary path exceeds PSMR, so that "the SCTP sender is allowed to continue data transmission on a new working path even when the old primary destination address becomes active again". This patch is to add this tunable parameter, 'ps_retrans' per netns, sock, asoc and transport. It also allows a user to change ps_retrans per netns by sysctl, and ps_retrans per sock/asoc/transport will be initialized with it. The check will be done in sctp_do_8_2_transport_strike() when this feature is enabled. Note this feature is disabled by initializing 'ps_retrans' per netns as 0xffff by default, and its value can't be less than 'pf_retrans' when changing by sysctl. v3->v4: - add define SCTP_PS_RETRANS_MAX 0xffff, and use it on extra2 of sysctl 'ps_retrans'. - add a new entry for ps_retrans on ip-sysctl.txt. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/ip-sysctl.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 0b0feb5b6b00..099a55bd1432 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -2195,6 +2195,18 @@ pf_retrans - INTEGER
Default: 0
+ps_retrans - INTEGER
+ Primary.Switchover.Max.Retrans (PSMR), it's a tunable parameter coming
+ from section-5 "Primary Path Switchover" in rfc7829. The primary path
+ will be changed to another active path when the path error counter on
+ the old primary path exceeds PSMR, so that "the SCTP sender is allowed
+ to continue data transmission on a new working path even when the old
+ primary destination address becomes active again". Note this feature
+ is disabled by initializing 'ps_retrans' per netns as 0xffff by default,
+ and its value can't be less than 'pf_retrans' when changing by sysctl.
+
+ Default: 0xffff
+
rto_initial - INTEGER
The initial round trip timeout value in milliseconds that will be used
in calculating round trip times. This is the initial time interval