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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2016-06-28 16:57:06 +0200
committerDavid S. Miller <davem@davemloft.net>2016-06-30 06:18:24 -0400
commit1080ab95e3c7bdd77870e209aff83c763fdcf439 (patch)
tree16ffa738a90a36411886403ed92f5e1fef115486 /net/bridge/br_if.c
parent80e73cc563c4359be809a03bcb8e7e28141a813a (diff)
downloadlinux-1080ab95e3c7bdd77870e209aff83c763fdcf439.tar.bz2
net: bridge: add support for IGMP/MLD stats and export them via netlink
This patch adds stats support for the currently used IGMP/MLD types by the bridge. The stats are per-port (plus one stat per-bridge) and per-direction (RX/TX). The stats are exported via netlink via the new linkxstats API (RTM_GETSTATS). In order to minimize the performance impact, a new option is used to enable/disable the stats - multicast_stats_enabled, similar to the recent vlan stats. Also in order to avoid multiple IGMP/MLD type lookups and checks, we make use of the current "igmp" member of the bridge private skb->cb region to record the type on Rx (both host-generated and external packets pass by multicast_rcv()). We can do that since the igmp member was used as a boolean and all the valid IGMP/MLD types are positive values. The normal bridge fast-path is not affected at all, the only affected paths are the flooding ones and since we make use of the IGMP/MLD type, we can quickly determine if the packet should be counted using cache-hot data (cb's igmp member). We add counters for: * IGMP Queries * IGMP Leaves * IGMP v1/v2/v3 reports * MLD Queries * MLD Leaves * MLD v1/v2 reports These are invaluable when monitoring or debugging complex multicast setups with bridges. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_if.c')
-rw-r--r--net/bridge/br_if.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 8217aecf025b..f2fede05d32c 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -345,8 +345,8 @@ static int find_portno(struct net_bridge *br)
static struct net_bridge_port *new_nbp(struct net_bridge *br,
struct net_device *dev)
{
- int index;
struct net_bridge_port *p;
+ int index, err;
index = find_portno(br);
if (index < 0)
@@ -366,7 +366,12 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
br_init_port(p);
br_set_state(p, BR_STATE_DISABLED);
br_stp_port_timer_init(p);
- br_multicast_add_port(p);
+ err = br_multicast_add_port(p);
+ if (err) {
+ dev_put(dev);
+ kfree(p);
+ p = ERR_PTR(err);
+ }
return p;
}