bridge: mrp: Add support for role MRA

A node that has the MRA role, it can behave as MRM or MRC.

Initially it starts as MRM and sends MRP_Test frames on both ring ports.
If it detects that there are MRP_Test send by another MRM, then it
checks if these frames have a lower priority than itself. In this case
it would send MRP_Nack frames to notify the other node that it needs to
stop sending MRP_Test frames.
If it receives a MRP_Nack frame then it stops sending MRP_Test frames
and starts to behave as a MRC but it would continue to monitor the
MRP_Test frames send by MRM. If at a point the MRM stops to send
MRP_Test frames it would get the MRM role and start to send MRP_Test
frames.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 41 insertions, 0 deletions

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index f82ef4c45f5e..b8c059b4e06d 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -130,6 +130,7 @@ struct switchdev_obj_ring_test_mrp {
 	u8 max_miss;
 	u32 ring_id;
 	u32 period;
+	bool monitor;
 };
 
 #define SWITCHDEV_OBJ_RING_TEST_MRP(OBJ) \
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 0162c1370ecb..caa6914a3e53 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -222,6 +222,7 @@ enum {
 	IFLA_BRIDGE_MRP_START_TEST_INTERVAL,
 	IFLA_BRIDGE_MRP_START_TEST_MAX_MISS,
 	IFLA_BRIDGE_MRP_START_TEST_PERIOD,
+	IFLA_BRIDGE_MRP_START_TEST_MONITOR,
 	__IFLA_BRIDGE_MRP_START_TEST_MAX,
 };
 
@@ -249,6 +250,7 @@ struct br_mrp_start_test {
 	__u32 interval;
 	__u32 max_miss;
 	__u32 period;
+	__u32 monitor;
 };
 
 struct bridge_stp_xstats {
diff --git a/include/uapi/linux/mrp_bridge.h b/include/uapi/linux/mrp_bridge.h
index bcad42128d62..84f15f48a7cb 100644
--- a/include/uapi/linux/mrp_bridge.h
+++ b/include/uapi/linux/mrp_bridge.h
@@ -11,11 +11,14 @@
 #define MRP_DOMAIN_UUID_LENGTH		16
 #define MRP_VERSION			1
 #define MRP_FRAME_PRIO			7
+#define MRP_OUI_LENGTH			3
+#define MRP_MANUFACTURE_DATA_LENGTH	2
 
 enum br_mrp_ring_role_type {
 	BR_MRP_RING_ROLE_DISABLED,
 	BR_MRP_RING_ROLE_MRC,
 	BR_MRP_RING_ROLE_MRM,
+	BR_MRP_RING_ROLE_MRA,
 };
 
 enum br_mrp_ring_state_type {
@@ -43,6 +46,13 @@ enum br_mrp_tlv_header_type {
 	BR_MRP_TLV_HEADER_RING_TOPO = 0x3,
 	BR_MRP_TLV_HEADER_RING_LINK_DOWN = 0x4,
 	BR_MRP_TLV_HEADER_RING_LINK_UP = 0x5,
+	BR_MRP_TLV_HEADER_OPTION = 0x7f,
+};
+
+enum br_mrp_sub_tlv_header_type {
+	BR_MRP_SUB_TLV_HEADER_TEST_MGR_NACK = 0x1,
+	BR_MRP_SUB_TLV_HEADER_TEST_PROPAGATE = 0x2,
+	BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR = 0x3,
 };
 
 struct br_mrp_tlv_hdr {
@@ -50,6 +60,11 @@ struct br_mrp_tlv_hdr {
 	__u8 length;
 };
 
+struct br_mrp_sub_tlv_hdr {
+	__u8 type;
+	__u8 length;
+};
+
 struct br_mrp_end_hdr {
 	struct br_mrp_tlv_hdr hdr;
 };
@@ -81,4 +96,27 @@ struct br_mrp_ring_link_hdr {
 	__be16 blocked;
 };
 
+struct br_mrp_sub_opt_hdr {
+	__u8 type;
+	__u8 manufacture_data[MRP_MANUFACTURE_DATA_LENGTH];
+};
+
+struct br_mrp_test_mgr_nack_hdr {
+	__be16 prio;
+	__u8 sa[ETH_ALEN];
+	__be16 other_prio;
+	__u8 other_sa[ETH_ALEN];
+};
+
+struct br_mrp_test_prop_hdr {
+	__be16 prio;
+	__u8 sa[ETH_ALEN];
+	__be16 other_prio;
+	__u8 other_sa[ETH_ALEN];
+};
+
+struct br_mrp_oui_hdr {
+	__u8 oui[MRP_OUI_LENGTH];
+};
+
 #endif