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netfilter: ipvs: Keep latest weight of destination

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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@navercorp.com>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Inju Song 2018-03-27 23:14:40 +09:00 committed by Simon Horman
parent 535101ec88
commit a2c09ac0fb
2 changed files with 5 additions and 0 deletions
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1
include/net/ip_vs.h
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@ -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 */

4
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -821,6 +821,10 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
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;