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net: bridge: add support for IGMP/MLD stats and export them via netlink

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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>
This commit is contained in:
Nikolay Aleksandrov
2016-06-28 16:57:06 +02:00
committed by David S. Miller
parent 80e73cc563
commit 1080ab95e3
10 changed files with 390 additions and 46 deletions
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26
include/uapi/linux/if_bridge.h
View File

@@ -247,8 +247,34 @@ enum {
enum {
BRIDGE_XSTATS_UNSPEC,
BRIDGE_XSTATS_VLAN,
BRIDGE_XSTATS_MCAST,
BRIDGE_XSTATS_PAD,
__BRIDGE_XSTATS_MAX
};
#define BRIDGE_XSTATS_MAX (__BRIDGE_XSTATS_MAX - 1)
enum {
BR_MCAST_DIR_RX,
BR_MCAST_DIR_TX,
BR_MCAST_DIR_SIZE
};
/* IGMP/MLD statistics */
struct br_mcast_stats {
__u64 igmp_queries[BR_MCAST_DIR_SIZE];
__u64 igmp_leaves[BR_MCAST_DIR_SIZE];
__u64 igmp_v1reports[BR_MCAST_DIR_SIZE];
__u64 igmp_v2reports[BR_MCAST_DIR_SIZE];
__u64 igmp_v3reports[BR_MCAST_DIR_SIZE];
__u64 igmp_parse_errors;
__u64 mld_queries[BR_MCAST_DIR_SIZE];
__u64 mld_leaves[BR_MCAST_DIR_SIZE];
__u64 mld_v1reports[BR_MCAST_DIR_SIZE];
__u64 mld_v2reports[BR_MCAST_DIR_SIZE];
__u64 mld_parse_errors;
__u64 mcast_bytes[BR_MCAST_DIR_SIZE];
__u64 mcast_packets[BR_MCAST_DIR_SIZE];
};
#endif /* _UAPI_LINUX_IF_BRIDGE_H */