netdev - [PATCH iproute2-next v2 3/3] man: man8: bridge: Describe mcast_max

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Date:   Tue, 7 Feb 2023 11:27:50 +0100
From:   Petr Machata <petrm@...dia.com>
To:     <netdev@...r.kernel.org>, <dsahern@...il.com>,
        <stephen@...workplumber.org>
CC:     Nikolay Aleksandrov <razor@...ckwall.org>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>
Subject: [PATCH iproute2-next v2 3/3] man: man8: bridge: Describe mcast_max_groups

Add documentation for per-port and port-port-vlan option mcast_max_groups.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---

Notes:
    v2:
    - Mention that the default value is 0.

 man/man8/bridge.8 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index f73e538a3536..abc0417b2057 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -47,6 +47,8 @@ bridge \- show / manipulate bridge addresses and devices
 .BR hwmode " { " vepa " | " veb " } ] [ "
 .BR bcast_flood " { " on " | " off " } ] [ "
 .BR mcast_flood " { " on " | " off " } ] [ "
+.BR mcast_max_groups
+.IR MAX_GROUPS " ] ["
 .BR mcast_router
 .IR MULTICAST_ROUTER " ] ["
 .BR mcast_to_unicast " { " on " | " off " } ] [ "
@@ -169,6 +171,8 @@ bridge \- show / manipulate bridge addresses and devices
 .IR VID " [ "
 .B state
 .IR STP_STATE " ] [ "
+.B mcast_max_groups
+.IR MAX_GROUPS " ] [ "
 .B mcast_router
 .IR MULTICAST_ROUTER " ]"
 
@@ -517,6 +521,15 @@ By default this flag is on.
 Controls whether multicast traffic for which there is no MDB entry will be
 flooded towards this given port. By default this flag is on.
 
+.TP
+.BI mcast_max_groups " MAX_GROUPS "
+Sets the maximum number of MDB entries that can be registered for a given
+port. Attempts to register more MDB entries at the port than this limit
+allows will be rejected, whether they are done through netlink (e.g. the
+\fBbridge\fR tool), or IGMP or MLD membership reports. Setting a limit to 0
+has the effect of disabling the limit. The default value is 0. See also the
+\fBip link\fR option \fBmcast_hash_max\fR.
+
 .TP
 .BI mcast_router " MULTICAST_ROUTER "
 This flag is almost the same as the per-VLAN flag, see below, except its
@@ -1107,6 +1120,15 @@ is used during the STP election process. In this state, the vlan will only proce
 STP BPDUs.
 .sp
 
+.TP
+.BI mcast_max_groups " MAX_GROUPS "
+Sets the maximum number of MDB entries that can be registered for a given
+VLAN on a given port. A VLAN-specific equivalent of the per-port option of
+the same name, see above for details.
+
+Note that this option is only available when \fBip link\fR option
+\fBmcast_vlan_snooping\fR is enabled.
+
 .TP
 .BI mcast_router " MULTICAST_ROUTER "
 configure this vlan and interface's multicast router mode, note that only modes
-- 
2.39.0