Add a utility function that converts LID routed portid to direct route

In planarized fabrics, all SMPs must be sent by direct route.
convert_portid_to_dr converts a portid object to direct route.

Signed-off-by: Amir Nir <anir@nvidia.com>

Author: anir-nvidia

libibnetdisc/ibnetdisc.c

@@ -1003,6 +1003,39 @@ ibnd_port_t *ibnd_find_port_dr(ibnd_fabric_t * fabric, char *dr_str)
 	return rc;
 }
 
+int convert_portid_to_dr(ibnd_fabric_t *fabric, ib_portid_t *portid, enum MAD_DEST dest_type)
+{
+	ibnd_port_t *found_port = NULL;
+	ib_portid_t new_portid;
+	if (dest_type == IB_DEST_DRPATH || dest_type == IB_DEST_DRSLID)
+		return 0;
+	// copy portid, reset all destination fields
+	memcpy(&new_portid, portid, sizeof(ib_portid_t));
+	new_portid.lid = 0;
+	memset(&new_portid.drpath, 0, sizeof(ib_dr_path_t));
+	if (!fabric)
+		return -1;
+
+	switch (dest_type) {
+	case IB_DEST_LID:
+	case IB_DEST_GID:
+	case IB_DEST_GUID:
+		found_port = ibnd_find_port_lid(fabric, portid->lid);
+		if (!found_port || !found_port->node)
+			return -1;
+		memcpy(&new_portid.drpath, &found_port->node->path_portid.drpath, sizeof(ib_dr_path_t));
+		break;
+	case IB_DEST_DRPATH:
+	case IB_DEST_DRSLID:
+		return 0;
+	default:
+		return -1;
+	}
+
+	memcpy(portid, &new_portid, sizeof(ib_portid_t));
+	return 0;
+}
+
 void ibnd_iter_ports(ibnd_fabric_t * fabric, ibnd_iter_port_func_t func,
 			void *user_data)
 {

libibnetdisc/ibnetdisc.h

@@ -228,6 +228,18 @@ typedef void (*ibnd_iter_port_func_t) (ibnd_port_t * port, void *user_data);
 void ibnd_iter_ports(ibnd_fabric_t *fabric, ibnd_iter_port_func_t func,
 		     void *user_data);
 
+/** =========================================================================
+ * Port operations
+ */
+int convert_portid_to_dr(ibnd_fabric_t *fabric, ib_portid_t *portid, enum MAD_DEST dest_type);
+	/**
+	 * Convert a portid's destination type to direct route.
+	 *
+	 * fabric: discovered fabric
+	 * portid: input/output portid object, to be converted to direct route
+	 * dest_type: current destination type
+	 */
+
 /** =========================================================================
  * Chassis queries
  */

libibnetdisc/libibnetdisc.map

@@ -18,6 +18,7 @@ IBNETDISC_1.0 {
 		ibnd_find_port_dr;
 		ibnd_find_port_lid;
 		ibnd_iter_ports;
+		convert_portid_to_dr;
 		ext_umad_get_cas;
 		ext_umad_get_ca_by_name;
 	local: *;