netdev - [RFC net-next 4/9] net: dsa: introduce dsa_is_upstream

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Date:   Tue, 21 May 2019 15:29:59 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     netdev@...r.kernel.org
Cc:     cphealy@...il.com, Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>
Subject: [RFC net-next 4/9] net: dsa: introduce dsa_is_upstream_port

Introduce a dsa_is_upstream_port helper to check if a given switch
port is directly or indirectly connected to a CPU port.

Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
 include/net/dsa.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 7b10a067b06d..c5b45bfeea01 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -347,6 +347,15 @@ static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
 	return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
 }
 
+/* Return whether the port is a local upstream port */
+static inline bool dsa_is_upstream_port(struct dsa_switch *ds, int port)
+{
+	if (dsa_is_unused_port(ds, port))
+		return false;
+
+	return dsa_upstream_port(ds, port) == port;
+}
+
 static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
 {
 	const struct dsa_switch *ds = dp->ds;
-- 
2.21.0