The hashing table in scheduler such as source hash
or maglev hash should ignore the changed weight to 0
and allow changing the weight from/to non-0 values.
So, struct ip_vs_dest needs to keep weight with latest
non-0 weight.
Signed-off-by: Inju Song <inju.song@xxxxxxxxxxxxx>
---
include/net/ip_vs.h | 1 +
net/netfilter/ipvs/ip_vs_ctl.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 4f4f786..c9e70ff 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -668,6 +668,7 @@ struct ip_vs_dest {
volatile unsigned int flags; /* dest status flags */
atomic_t conn_flags; /* flags to copy to conn */
atomic_t weight; /* server weight */
+ atomic_t last_weight; /* server latest weight */
refcount_t refcnt; /* reference counter */
struct ip_vs_stats stats; /* statistics */
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 1fa3c23..54c83a8 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -824,6 +824,10 @@ static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
if (add && udest->af != svc->af)
ipvs->mixed_address_family_dests++;
+ /* keep the last_weight with latest non-0 weight */
+ if (add || udest->weight != 0)
+ atomic_set(&dest->last_weight, udest->weight);
+
/* set the weight and the flags */
atomic_set(&dest->weight, udest->weight);
conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
--
1.8.3.1
--
Inju Song
NAVER Corporation
--
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