netdev - [PATCH iproute2-next v2 10/19] bridge: vlan: add global mcast_last_member

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Message-Id: <20210828110805.463429-11-razor@blackwall.org>
Date:   Sat, 28 Aug 2021 14:07:56 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     roopa@...dia.com, dsahern@...il.com, stephen@...workplumber.org,
        Joachim Wiberg <troglobit@...il.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [PATCH iproute2-next v2 10/19] bridge: vlan: add global mcast_last_member_count option

From: Nikolay Aleksandrov <nikolay@...dia.com>

Add control and dump support for the global mcast_last_member_count option
which controls the number of queries the bridge will send on the vlan after
a leave is received (default 2).
Syntax:
 $ bridge vlan global set dev bridge vid 1 mcast_last_member_count 10

Signed-off-by: Nikolay Aleksandrov <nikolay@...dia.com>
---
v2: adjust help msg alignment to fit in 100 columns

 bridge/vlan.c     | 15 +++++++++++++++
 man/man8/bridge.8 | 10 +++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/bridge/vlan.c b/bridge/vlan.c
index aa6fbef27b06..479574ca38e5 100644
--- a/bridge/vlan.c
+++ b/bridge/vlan.c
@@ -42,6 +42,7 @@ static void usage(void)
 		"                      [ mcast_snooping MULTICAST_SNOOPING ]\n"
 		"                      [ mcast_igmp_version IGMP_VERSION ]\n"
 		"                      [ mcast_mld_version MLD_VERSION ]\n"
+		"                      [ mcast_last_member_count LAST_MEMBER_COUNT ]\n"
 		"       bridge vlan global { show } [ dev DEV ] [ vid VLAN_ID ]\n");
 	exit(-1);
 }
@@ -359,6 +360,7 @@ static int vlan_global_option_set(int argc, char **argv)
 	short vid_end = -1;
 	char *d = NULL;
 	short vid = -1;
+	__u32 val32;
 	__u8 val8;
 
 	afspec = addattr_nest(&req.n, sizeof(req),
@@ -420,6 +422,13 @@ static int vlan_global_option_set(int argc, char **argv)
 				invarg("invalid mcast_mld_version", *argv);
 			addattr8(&req.n, 1024,
 				 BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION, val8);
+		} else if (strcmp(*argv, "mcast_last_member_count") == 0) {
+			NEXT_ARG();
+			if (get_u32(&val32, *argv, 0))
+				invarg("invalid mcast_last_member_count", *argv);
+			addattr32(&req.n, 1024,
+				  BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_CNT,
+				  val32);
 		} else {
 			if (matches(*argv, "help") == 0)
 				NEXT_ARG();
@@ -768,6 +777,12 @@ static void print_vlan_global_opts(struct rtattr *a, int ifindex)
 		print_uint(PRINT_ANY, "mcast_mld_version",
 			   "mcast_mld_version %u ", rta_getattr_u8(vattr));
 	}
+	if (vtb[BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION]) {
+		vattr = vtb[BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_CNT];
+		print_uint(PRINT_ANY, "mcast_last_member_count",
+			   "mcast_last_member_count %u ",
+			   rta_getattr_u32(vattr));
+	}
 	print_nl();
 	close_json_object();
 }
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index dcbff9367334..cea755184336 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -163,7 +163,9 @@ bridge \- show / manipulate bridge addresses and devices
 .B mcast_igmp_version
 .IR IGMP_VERSION " ] [ "
 .B mcast_mld_version
-.IR MLD_VERSION " ]"
+.IR MLD_VERSION " ] [ "
+.B mcast_last_member_count
+.IR LAST_MEMBER_COUNT " ]"
 
 .ti -8
 .BR "bridge vlan global" " [ " show " ] [ "
@@ -943,6 +945,12 @@ set the IGMP version. Default is 2.
 .BI mcast_mld_version " MLD_VERSION "
 set the MLD version. Default is 1.
 
+.TP
+.BI mcast_last_member_count " LAST_MEMBER_COUNT "
+set multicast last member count, ie the number of queries the bridge
+will send before stopping forwarding a multicast group after a "leave"
+message has been received. Default is 2.
+
 .SS bridge vlan global show - list global vlan options.
 
 This command displays the global VLAN options for each VLAN entry.
-- 
2.31.1