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[PATCHv2 ipvs-next 2/3] netfilter: ipvs: Keep latest weight of destinati

To: lvs-devel@xxxxxxxxxxxxxxx
Subject: [PATCHv2 ipvs-next 2/3] netfilter: ipvs: Keep latest weight of destination.
Cc: Julian Anastasov <ja@xxxxxx>, Simon Horman <horms@xxxxxxxxxxxx>, Wensong Zhang <wensong@xxxxxxxxxxxx>
From: Inju Song <inju.song@xxxxxxxxxxxxx>
Date: Sun, 25 Feb 2018 15:43:15 +0900
    Maglev hashing table should ignore 0 weight and allow changing
    the weight from/to non-0 values. so struct ip_vs_dest needs to
    keep weight with latest non-0 weight in struct ip_vs_dest.

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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