port: Provide methods to set and get the link status.

Signed-off-by: Richard Cochran <[email protected]>

port.c

@@ -117,6 +117,7 @@ struct port {
 	int                 path_trace_enabled;
 	int                 rx_timestamp_offset;
 	int                 tx_timestamp_offset;
+	int                 link_status;
 	struct fault_interval flt_interval_pertype[FT_CNT];
 	enum fault_type     last_fault_type;
 	unsigned int        versionNumber; /*UInteger4*/
@@ -2357,6 +2358,17 @@ int port_number(struct port *p)
 	return portnum(p);
 }
 
+int port_link_status_get(struct port *p)
+{
+	return p->link_status;
+}
+
+void port_link_status_set(struct port *p, int up)
+{
+	p->link_status = up ? 1 : 0;
+	pr_notice("port %hu: link %s", portnum(p), up ? "up" : "down");
+}
+
 int port_manage(struct port *p, struct port *ingress, struct ptp_message *msg)
 {
 	struct management_tlv *mgt;
@@ -2573,6 +2585,7 @@ struct port *port_open(int phc_index,
 	p->path_trace_enabled = config_get_int(cfg, p->name, "path_trace_enabled");
 	p->rx_timestamp_offset = config_get_int(cfg, p->name, "ingressLatency");
 	p->tx_timestamp_offset = config_get_int(cfg, p->name, "egressLatency");
+	p->link_status = 1;
 	p->clock = clock;
 	p->trp = transport_create(cfg, transport);
 	if (!p->trp)

port.h

@@ -126,6 +126,20 @@ struct PortIdentity port_identity(struct port *p);
  */
 int port_number(struct port *p);
 
+/**
+ * Obtain the link status of a port.
+ * @param p        A port instance.
+ * @return         One (1) if the link is up, zero otherwise.
+ */
+int port_link_status_get(struct port *p);
+
+/**
+ * Sets the link status for a port.
+ * @param p        A port instance.
+ * @param up       Pass one (1) if the link is up and zero if down.
+ */
+void port_link_status_set(struct port *p, int up);
+
 /**
  * Manage a port according to a given message.
  * @param p        A pointer previously obtained via port_open().