From: Julian Anastasov <ja@xxxxxx>
Add sync_persist_mode flag to reduce sync traffic
by syncing only persistent templates.
Signed-off-by: Julian Anastasov <ja@xxxxxx>
Tested-by: Aleksey Chudov <aleksey.chudov@xxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
Documentation/networking/ipvs-sysctl.txt | 13 +++++++++++++
include/net/ip_vs.h | 11 +++++++++++
net/netfilter/ipvs/ip_vs_ctl.c | 7 +++++++
net/netfilter/ipvs/ip_vs_sync.c | 12 ++++++++++++
4 files changed, 43 insertions(+)
diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
index 9573d0c..7a3c047 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -181,6 +181,19 @@ snat_reroute - BOOLEAN
always be the same as the original route so it is an optimisation
to disable snat_reroute and avoid the recalculation.
+sync_persist_mode - INTEGER
+ default 0
+
+ Controls the synchronisation of connections when using persistence
+
+ 0: All types of connections are synchronised
+ 1: Attempt to reduce the synchronisation traffic depending on
+ the connection type. For persistent services avoid synchronisation
+ for normal connections, do it only for persistence templates.
+ In such case, for TCP and SCTP it may need enabling sloppy_tcp and
+ sloppy_sctp flags on backup servers. For non-persistent services
+ such optimization is not applied, mode 0 is assumed.
+
sync_version - INTEGER
default 1
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index e667df1..f0d70f0 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -975,6 +975,7 @@ struct netns_ipvs {
int sysctl_snat_reroute;
int sysctl_sync_ver;
int sysctl_sync_ports;
+ int sysctl_sync_persist_mode;
unsigned long sysctl_sync_qlen_max;
int sysctl_sync_sock_size;
int sysctl_cache_bypass;
@@ -1076,6 +1077,11 @@ static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
return ACCESS_ONCE(ipvs->sysctl_sync_ports);
}
+static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
+{
+ return ipvs->sysctl_sync_persist_mode;
+}
+
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_qlen_max;
@@ -1139,6 +1145,11 @@ static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
return 1;
}
+static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
+{
+ return 0;
+}
+
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
return IPVS_SYNC_QLEN_MAX;
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index da035fc..c8148e4 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1715,6 +1715,12 @@ static struct ctl_table vs_vars[] = {
.proc_handler = &proc_do_sync_ports,
},
{
+ .procname = "sync_persist_mode",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
.procname = "sync_qlen_max",
.maxlen = sizeof(unsigned long),
.mode = 0644,
@@ -3729,6 +3735,7 @@ static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
tbl[idx++].data = &ipvs->sysctl_sync_ver;
ipvs->sysctl_sync_ports = 1;
tbl[idx++].data = &ipvs->sysctl_sync_ports;
+ tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
ipvs->sysctl_sync_sock_size = 0;
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 2fc6639..f448471 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -425,6 +425,16 @@ ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
return sb;
}
+/* Check if connection is controlled by persistence */
+static inline bool in_persistence(struct ip_vs_conn *cp)
+{
+ for (cp = cp->control; cp; cp = cp->control) {
+ if (cp->flags & IP_VS_CONN_F_TEMPLATE)
+ return true;
+ }
+ return false;
+}
+
/* Check if conn should be synced.
* pkts: conn packets, use sysctl_sync_threshold to avoid packet check
* - (1) sync_refresh_period: reduce sync rate. Additionally, retry
@@ -447,6 +457,8 @@ static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
/* Check if we sync in current state */
if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
force = 0;
+ else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
+ return 0;
else if (likely(cp->protocol == IPPROTO_TCP)) {
if (!((1 << cp->state) &
((1 << IP_VS_TCP_S_ESTABLISHED) |
--
1.8.2.1
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