netdev - [PATCH iproute2 1/3] ip: bridge: add support for mst

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Message-Id: <20240614133818.14876-2-tobias@waldekranz.com>
Date: Fri, 14 Jun 2024 15:38:16 +0200
From: Tobias Waldekranz <tobias@...dekranz.com>
To: stephen@...workplumber.org,
	dsahern@...nel.org
Cc: liuhangbin@...il.com,
	netdev@...r.kernel.org
Subject: [PATCH iproute2 1/3] ip: bridge: add support for mst_enabled

When enabled, the bridge's legacy per-VLAN STP facility is replaced
with the Multiple Spanning Tree Protocol (MSTP) compatible version.

Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
 ip/iplink_bridge.c    | 19 +++++++++++++++++++
 man/man8/ip-link.8.in | 14 ++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index 6b70ffbb..8c4428a0 100644
--- a/ip/iplink_bridge.c
+++ b/ip/iplink_bridge.c
@@ -30,6 +30,7 @@ static void print_explain(FILE *f)
 		"		  [ max_age MAX_AGE ]\n"
 		"		  [ ageing_time AGEING_TIME ]\n"
 		"		  [ stp_state STP_STATE ]\n"
+		"		  [ mst_enabled MST_ENABLED ]\n"
 		"		  [ priority PRIORITY ]\n"
 		"		  [ group_fwd_mask MASK ]\n"
 		"		  [ group_address ADDRESS ]\n"
@@ -169,6 +170,18 @@ static int bridge_parse_opt(struct link_util *lu, int argc, char **argv,
 				bm.optval |= no_ll_learn_bit;
 			else
 				bm.optval &= ~no_ll_learn_bit;
+		} else if (matches(*argv, "mst_enabled") == 0) {
+			__u32 mst_bit = 1 << BR_BOOLOPT_MST_ENABLE;
+			__u8 mst_enabled;
+
+			NEXT_ARG();
+			if (get_u8(&mst_enabled, *argv, 0))
+				invarg("invalid mst_enabled", *argv);
+			bm.optmask |= mst_bit;
+			if (mst_enabled)
+				bm.optval |= mst_bit;
+			else
+				bm.optval &= ~mst_bit;
 		} else if (strcmp(*argv, "fdb_max_learned") == 0) {
 			__u32 fdb_max_learned;
 
@@ -609,6 +622,7 @@ static void bridge_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 	if (tb[IFLA_BR_MULTI_BOOLOPT]) {
 		__u32 mcvl_bit = 1 << BR_BOOLOPT_MCAST_VLAN_SNOOPING;
 		__u32 no_ll_learn_bit = 1 << BR_BOOLOPT_NO_LL_LEARN;
+		__u32 mst_bit = 1 << BR_BOOLOPT_MST_ENABLE;
 		struct br_boolopt_multi *bm;
 
 		bm = RTA_DATA(tb[IFLA_BR_MULTI_BOOLOPT]);
@@ -622,6 +636,11 @@ static void bridge_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 				   "mcast_vlan_snooping",
 				   "mcast_vlan_snooping %u ",
 				    !!(bm->optval & mcvl_bit));
+		if (bm->optmask & mst_bit)
+			print_uint(PRINT_ANY,
+				   "mst_enabled",
+				   "mst_enabled %u ",
+				   !!(bm->optval & mst_bit));
 	}
 
 	if (tb[IFLA_BR_MCAST_ROUTER])
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index c1984158..eabca490 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -1685,6 +1685,8 @@ the following additional arguments are supported:
 ] [
 .BI stp_state " STP_STATE "
 ] [
+.BI mst_enabled " MST_ENABLED "
+] [
 .BI priority " PRIORITY "
 ] [
 .BI no_linklocal_learn " NO_LINKLOCAL_LEARN "
@@ -1788,6 +1790,18 @@ or off
 .RI ( STP_STATE " == 0). "
 for this bridge.
 
+.BI mst_enabled " MST_ENABLED "
+- turn multiple spanning tree (MST) support on
+.RI ( MST_ENABLED " > 0) "
+or off
+.RI ( MST_ENABLED " == 0). "
+When enabled, sets of VLANs can be associated with multiple spanning
+tree instances (MSTIs), and STP states for each port can be controlled
+on a per-MSTI basis. Note: no implementation of the MSTP protocol is
+provided, only the primitives needed to implement it. To avoid
+interfering with the legacy per-VLAN STP states, this setting can only
+be changed when no bridge VLANs are configured.
+
 .BI priority " PRIORITY "
 - set this bridge's spanning tree priority, used during STP root
 bridge election.
-- 
2.34.1