bridge: mrp: Set the priority of MRP instance

Each MRP instance has a priority, a lower value means a higher priority.
The priority of MRP instance is stored in MRP_Test frame in this way
all the MRP nodes in the ring can see other nodes priority.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -116,6 +116,7 @@ struct switchdev_obj_mrp {
 	struct net_device *p_port;
 	struct net_device *s_port;
 	u32 ring_id;
+	u16 prio;
 };
 
 #define SWITCHDEV_OBJ_MRP(OBJ) \

include/uapi/linux/if_bridge.h

@@ -176,6 +176,7 @@ enum {
 	IFLA_BRIDGE_MRP_INSTANCE_RING_ID,
 	IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX,
 	IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX,
+	IFLA_BRIDGE_MRP_INSTANCE_PRIO,
 	__IFLA_BRIDGE_MRP_INSTANCE_MAX,
 };
 
@@ -230,6 +231,7 @@ struct br_mrp_instance {
 	__u32 ring_id;
 	__u32 p_ifindex;
 	__u32 s_ifindex;
+	__u16 prio;
 };
 
 struct br_mrp_ring_state {

net/bridge/br_mrp.c

@@ -147,7 +147,7 @@ static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp,
 	br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr));
 	hdr = skb_put(skb, sizeof(*hdr));
 
-	hdr->prio = cpu_to_be16(MRP_DEFAULT_PRIO);
+	hdr->prio = cpu_to_be16(mrp->prio);
 	ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
 	hdr->port_role = cpu_to_be16(port_role);
 	hdr->state = cpu_to_be16(mrp->ring_state);
@@ -290,6 +290,7 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
 		return -ENOMEM;
 
 	mrp->ring_id = instance->ring_id;
+	mrp->prio = instance->prio;
 
 	p = br_mrp_get_port(br, instance->p_ifindex);
 	spin_lock_bh(&br->lock);

net/bridge/br_mrp_netlink.c

@@ -22,6 +22,7 @@ br_mrp_instance_policy[IFLA_BRIDGE_MRP_INSTANCE_MAX + 1] = {
 	[IFLA_BRIDGE_MRP_INSTANCE_RING_ID]	= { .type = NLA_U32 },
 	[IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX]	= { .type = NLA_U32 },
 	[IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX]	= { .type = NLA_U32 },
+	[IFLA_BRIDGE_MRP_INSTANCE_PRIO]		= { .type = NLA_U16 },
 };
 
 static int br_mrp_instance_parse(struct net_bridge *br, struct nlattr *attr,
@@ -49,6 +50,10 @@ static int br_mrp_instance_parse(struct net_bridge *br, struct nlattr *attr,
 	inst.ring_id = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_RING_ID]);
 	inst.p_ifindex = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX]);
 	inst.s_ifindex = nla_get_u32(tb[IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX]);
+	inst.prio = MRP_DEFAULT_PRIO;
+
+	if (tb[IFLA_BRIDGE_MRP_INSTANCE_PRIO])
+		inst.prio = nla_get_u16(tb[IFLA_BRIDGE_MRP_INSTANCE_PRIO]);
 
 	if (cmd == RTM_SETLINK)
 		return br_mrp_add(br, &inst);

net/bridge/br_mrp_switchdev.c

@@ -12,6 +12,7 @@ int br_mrp_switchdev_add(struct net_bridge *br, struct br_mrp *mrp)
 		.p_port = rtnl_dereference(mrp->p_port)->dev,
 		.s_port = rtnl_dereference(mrp->s_port)->dev,
 		.ring_id = mrp->ring_id,
+		.prio = mrp->prio,
 	};
 	int err;
 

net/bridge/br_private_mrp.h

@@ -14,6 +14,7 @@ struct br_mrp {
 	struct net_bridge_port __rcu	*s_port;
 
 	u32				ring_id;
+	u16				prio;
 
 	enum br_mrp_ring_role_type	ring_role;
 	u8				ring_role_offloaded;