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authorPetr Machata <petrm@nvidia.com>2023-02-02 18:59:24 +0100
committerDavid S. Miller <davem@davemloft.net>2023-02-06 08:48:25 +0000
commitd47230a3480a5f6df98c5870ba26843850a600d5 (patch)
tree463b0a43658162f7ffc46a9bc9654262c4f38a33 /net/core
parenteceb30854f6b7d354ae52551b11aef2e2fa3e82e (diff)
net: bridge: Add a tracepoint for MDB overflows
The following patch will add two more maximum MDB allowances to the global one, mcast_hash_max, that exists today. In all these cases, attempts to add MDB entries above the configured maximums through netlink, fail noisily and obviously. Such visibility is missing when adding entries through the control plane traffic, by IGMP or MLD packets. To improve visibility in those cases, add a trace point that reports the violation, including the relevant netdevice (be it a slave or the bridge itself), and the MDB entry parameters: # perf record -e bridge:br_mdb_full & # [...] # perf script | cut -d: -f4- dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 0 dev v2 af 10 src :: grp ff0e::112/00:00:00:00:00:00 vid 0 dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 10 dev v2 af 10 src 2001:db8:1::1 grp ff0e::1/00:00:00:00:00:00 vid 10 dev v2 af 2 src ::ffff:192.0.2.1 grp ::ffff:239.1.1.1/00:00:00:00:00:00 vid 10 CC: Steven Rostedt <rostedt@goodmis.org> CC: linux-trace-kernel@vger.kernel.org Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/net-traces.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index ee7006bbe49b..805b7385dd8d 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -41,6 +41,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_external_learn_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(fdb_delete);
EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_update);
+EXPORT_TRACEPOINT_SYMBOL_GPL(br_mdb_full);
#endif
#if IS_ENABLED(CONFIG_PAGE_POOL)