From: Julian Anastasov <ja@ssi.bg>
Date: Sat, 20 Jun 2020 13:03:55 +0300
Subject: ipvs: avoid expiring many connections from timer
Patch-mainline: v5.9-rc1
Git-commit: f9200a52eedfe96ae8d9cbf68a363f5409a46117
References: bsc#1176447

Add new functions ip_vs_conn_del() and ip_vs_conn_del_put()
to release many IPVS connections in process context.
They are suitable for connections found in table
when we do not want to overload the timers.

Currently, the change is useful for the dropentry delayed
work but it will be used also in following patch
when flushing connections to failed destinations.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/netfilter/ipvs/ip_vs_conn.c |   53 ++++++++++++++++++++++++++++------------
 net/netfilter/ipvs/ip_vs_ctl.c  |    6 +++-
 2 files changed, 42 insertions(+), 17 deletions(-)

--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -807,6 +807,31 @@ static void ip_vs_conn_rcu_free(struct r
 	kmem_cache_free(ip_vs_conn_cachep, cp);
 }
 
+/* Try to delete connection while not holding reference */
+static void ip_vs_conn_del(struct ip_vs_conn *cp)
+{
+	if (del_timer(&cp->timer)) {
+		/* Drop cp->control chain too */
+		if (cp->control)
+			cp->timeout = 0;
+		ip_vs_conn_expire(&cp->timer);
+	}
+}
+
+/* Try to delete connection while holding reference */
+static void ip_vs_conn_del_put(struct ip_vs_conn *cp)
+{
+	if (del_timer(&cp->timer)) {
+		/* Drop cp->control chain too */
+		if (cp->control)
+			cp->timeout = 0;
+		__ip_vs_conn_put(cp);
+		ip_vs_conn_expire(&cp->timer);
+	} else {
+		__ip_vs_conn_put(cp);
+	}
+}
+
 static void ip_vs_conn_expire(struct timer_list *t)
 {
 	struct ip_vs_conn *cp = from_timer(cp, t, timer);
@@ -827,14 +852,17 @@ static void ip_vs_conn_expire(struct tim
 
 		/* does anybody control me? */
 		if (ct) {
+			bool has_ref = !cp->timeout && __ip_vs_conn_get(ct);
+
 			ip_vs_control_del(cp);
 			/* Drop CTL or non-assured TPL if not used anymore */
-			if (!cp->timeout && !atomic_read(&ct->n_control) &&
+			if (has_ref && !atomic_read(&ct->n_control) &&
 			    (!(ct->flags & IP_VS_CONN_F_TEMPLATE) ||
 			     !(ct->state & IP_VS_CTPL_S_ASSURED))) {
 				IP_VS_DBG(4, "drop controlling connection\n");
-				ct->timeout = 0;
-				ip_vs_conn_expire_now(ct);
+				ip_vs_conn_del_put(ct);
+			} else if (has_ref) {
+				__ip_vs_conn_put(ct);
 			}
 		}
 
@@ -1317,8 +1345,7 @@ try_drop:
 
 drop:
 			IP_VS_DBG(4, "drop connection\n");
-			cp->timeout = 0;
-			ip_vs_conn_expire_now(cp);
+			ip_vs_conn_del(cp);
 		}
 		cond_resched_rcu();
 	}
@@ -1341,19 +1368,15 @@ flush_again:
 		hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
 			if (cp->ipvs != ipvs)
 				continue;
-			/* As timers are expired in LIFO order, restart
-			 * the timer of controlling connection first, so
-			 * that it is expired after us.
-			 */
+			if (atomic_read(&cp->n_control))
+				continue;
 			cp_c = cp->control;
-			/* cp->control is valid only with reference to cp */
-			if (cp_c && __ip_vs_conn_get(cp)) {
+			IP_VS_DBG(4, "del connection\n");
+			ip_vs_conn_del(cp);
+			if (cp_c && !atomic_read(&cp_c->n_control)) {
 				IP_VS_DBG(4, "del controlling connection\n");
-				ip_vs_conn_expire_now(cp_c);
-				__ip_vs_conn_put(cp);
+				ip_vs_conn_del(cp_c);
 			}
-			IP_VS_DBG(4, "del connection\n");
-			ip_vs_conn_expire_now(cp);
 		}
 		cond_resched_rcu();
 	}
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -224,7 +224,8 @@ static void defense_work_handler(struct
 	update_defense_level(ipvs);
 	if (atomic_read(&ipvs->dropentry))
 		ip_vs_random_dropentry(ipvs);
-	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
+	queue_delayed_work(system_long_wq, &ipvs->defense_work,
+			   DEFENSE_TIMER_PERIOD);
 }
 #endif
 
@@ -4082,7 +4083,8 @@ static int __net_init ip_vs_control_net_
 	ipvs->sysctl_tbl = tbl;
 	/* Schedule defense work */
 	INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
-	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
+	queue_delayed_work(system_long_wq, &ipvs->defense_work,
+			   DEFENSE_TIMER_PERIOD);
 
 	return 0;
 }