netdev - [PATCH net-next 3/3] net: bridge: increase multicast's default maximum number of entries

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Message-Id: <20181204144411.20125-4-nikolay@cumulusnetworks.com>
Date:   Tue,  4 Dec 2018 16:44:11 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     roopa@...ulusnetworks.com, davem@...emloft.net,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: [PATCH net-next 3/3] net: bridge: increase multicast's default maximum number of entries

bridge's default hash_max was 512 which is rather conservative, now that
we're using the generic rhashtable API which autoshrinks let's increase
it to 4096 and move it to a define in br_private.h.

Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
 net/bridge/br_multicast.c | 2 +-
 net/bridge/br_private.h   | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 79f981a4c225..5871086a0ab1 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1743,7 +1743,7 @@ static void br_ip6_multicast_query_expired(struct timer_list *t)
 
 void br_multicast_init(struct net_bridge *br)
 {
-	br->hash_max = 512;
+	br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
 
 	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 	br->multicast_last_member_count = 2;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index e3c56b418543..a469a779478e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -31,6 +31,8 @@
 #define BR_PORT_BITS	10
 #define BR_MAX_PORTS	(1<<BR_PORT_BITS)
 
+#define BR_MULTICAST_DEFAULT_HASH_MAX 4096
+
 #define BR_VERSION	"2.3"
 
 /* Control of forwarding link local multicast */
-- 
2.17.2