[PATCH net-next 02/13] net: bridge: Add port attribute IFLA_BRPORT_MRP_RING_OPEN

[Horatiu Vultur <horatiu.vultur@microchip.com>]

This patch adds a new port attribute, IFLA_BRPORT_MRP_RING_OPEN, which allows
to notify the userspace when the port lost the continuite of MRP frames.

This attribute is set by kernel whenever the SW or HW detects that the ring is
being open or closed.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 include/uapi/linux/if_link.h       | 1 +
 net/bridge/br_netlink.c            | 6 ++++++
 net/bridge/br_private.h            | 4 ++++
 tools/include/uapi/linux/if_link.h | 1 +
 4 files changed, 12 insertions(+)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 61e0801c82df..4a295deb933b 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -343,6 +343,7 @@ enum {
 	IFLA_BRPORT_NEIGH_SUPPRESS,
 	IFLA_BRPORT_ISOLATED,
 	IFLA_BRPORT_BACKUP_PORT,
+	IFLA_BRPORT_MRP_RING_OPEN,
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 43dab4066f91..2f3a9e50c168 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -151,6 +151,9 @@ static inline size_t br_port_info_size(void)
 		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MULTICAST_ROUTER */
 #endif
 		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_GROUP_FWD_MASK */
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MRP_RING_OPEN */
+#endif
 		+ 0;
 }
 
@@ -213,6 +216,9 @@ static int br_port_fill_attrs(struct sk_buff *skb,
 	    nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask) ||
 	    nla_put_u8(skb, IFLA_BRPORT_NEIGH_SUPPRESS,
 		       !!(p->flags & BR_NEIGH_SUPPRESS)) ||
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+	    nla_put_u8(skb, IFLA_BRPORT_MRP_RING_OPEN, p->loc) ||
+#endif
 	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
 		return -EMSGSIZE;
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1f97703a52ff..735ec6ff86cc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -289,6 +289,10 @@ struct net_bridge_port {
 	u16				backup_redirected_cnt;
 
 	struct bridge_stp_xstats	stp_xstats;
+
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+	u8				loc;
+#endif
 };
 
 #define kobj_to_brport(obj)	container_of(obj, struct net_bridge_port, kobj)
diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h
index 024af2d1d0af..70dae9ba16f4 100644
--- a/tools/include/uapi/linux/if_link.h
+++ b/tools/include/uapi/linux/if_link.h
@@ -343,6 +343,7 @@ enum {
 	IFLA_BRPORT_NEIGH_SUPPRESS,
 	IFLA_BRPORT_ISOLATED,
 	IFLA_BRPORT_BACKUP_PORT,
+	IFLA_BRPORT_MRP_RING_OPEN,
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
-- 
2.17.1