[Bridge] [PATCH net-next v3 3/3] bridge: Extend br_fill_ifinfo to return MPR status

[Horatiu Vultur via Bridge]

This patch extends the function br_fill_ifinfo to return also the MRP
status for each instance on a bridge. It also adds a new filter
RTEXT_FILTER_MRP to return the MRP status only when this is set, not to
interfer with the vlans. The MRP status is return only on the bridge
interfaces.

Signed-off-by: Horatiu Vultur <horatiu.vul...@microchip.com>
---
 include/uapi/linux/rtnetlink.h |  1 +
 net/bridge/br_netlink.c        | 25 ++++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 879e64950a0a2..9b814c92de123 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -778,6 +778,7 @@ enum {
 #define RTEXT_FILTER_BRVLAN    (1 << 1)
 #define RTEXT_FILTER_BRVLAN_COMPRESSED (1 << 2)
 #define        RTEXT_FILTER_SKIP_STATS (1 << 3)
+#define RTEXT_FILTER_MRP       (1 << 4)
 
 /* End of information exported to user level */
 
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 240e260e3461c..c532fa65c9834 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -453,6 +453,28 @@ static int br_fill_ifinfo(struct sk_buff *skb,
                rcu_read_unlock();
                if (err)
                        goto nla_put_failure;
+
+               nla_nest_end(skb, af);
+       }
+
+       if (filter_mask & RTEXT_FILTER_MRP) {
+               struct nlattr *af;
+               int err;
+
+               if (!br_mrp_enabled(br) || port)
+                       goto done;
+
+               af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
+               if (!af)
+                       goto nla_put_failure;
+
+               rcu_read_lock();
+               err = br_mrp_fill_info(skb, br);
+               rcu_read_unlock();
+
+               if (err)
+                       goto nla_put_failure;
+
                nla_nest_end(skb, af);
        }
 
@@ -516,7 +538,8 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
        struct net_bridge_port *port = br_port_get_rtnl(dev);
 
        if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
-           !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
+           !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) &&
+           !(filter_mask & RTEXT_FILTER_MRP))
                return 0;
 
        return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
-- 
2.27.0