RDMA/core: Rename rdma_route.num_paths field to num_pri_alt_paths

This fields means the total number of primary and alternative paths,
i.e.,:
0 - No primary nor alternate path is available;
1 - Only primary path is available;
2 - Both primary and alternate path are available.
Rename it to avoid confusion as with follow patches primary path will
support multiple path records.

Signed-off-by: Mark Zhang <[e-mail]>
Reviewed-by: Mark Bloch <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/cma.c

···
 		goto err;
 
 	rt = &id->route;
-	rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
-	rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
-				     GFP_KERNEL);
+	rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
+	rt->path_rec = kmalloc_array(rt->num_pri_alt_paths,
+				     sizeof(*rt->path_rec), GFP_KERNEL);
 	if (!rt->path_rec)
 		goto err;
 
 	rt->path_rec[0] = *path;
-	if (rt->num_paths == 2)
+	if (rt->num_pri_alt_paths == 2)
 		rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
 
 	if (net_dev) {
···
 	route = &work->id->id.route;
 
 	if (!status) {
-		route->num_paths = 1;
+		route->num_pri_alt_paths = 1;
 		*route->path_rec = *path_rec;
 	} else {
 		work->old_state = RDMA_CM_ROUTE_QUERY;
···
 		dev_put(ndev);
 	}
 
-	id->route.num_paths = 1;
+	id->route.num_pri_alt_paths = 1;
 	return 0;
 
 err_free:
···
 		goto err1;
 	}
 
-	route->num_paths = 1;
+	route->num_pri_alt_paths = 1;
 
 	ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
 	if (!ndev) {
···
 err2:
 	kfree(route->path_rec);
 	route->path_rec = NULL;
-	route->num_paths = 0;
+	route->num_pri_alt_paths = 0;
 err1:
 	kfree(work);
 	return ret;
···
 	}
 
 	req.primary_path = &route->path_rec[0];
-	if (route->num_paths == 2)
+	if (route->num_pri_alt_paths == 2)
 		req.alternate_path = &route->path_rec[1];
 
 	req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;

drivers/infiniband/core/ucma.c

···
 {
 	struct rdma_dev_addr *dev_addr;
 
-	resp->num_paths = route->num_paths;
-	switch (route->num_paths) {
+	resp->num_paths = route->num_pri_alt_paths;
+	switch (route->num_pri_alt_paths) {
 	case 0:
 		dev_addr = &route->addr.dev_addr;
 		rdma_addr_get_dgid(dev_addr,
···
 				 struct rdma_route *route)
 {
 
-	resp->num_paths = route->num_paths;
-	switch (route->num_paths) {
+	resp->num_paths = route->num_pri_alt_paths;
+	switch (route->num_pri_alt_paths) {
 	case 0:
 		rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
 			    (union ib_gid *)&resp->ib_route[0].dgid);
···
 	if (!resp)
 		return -ENOMEM;
 
-	resp->num_paths = ctx->cm_id->route.num_paths;
+	resp->num_paths = ctx->cm_id->route.num_pri_alt_paths;
 	for (i = 0, out_len -= sizeof(*resp);
 	     i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
 	     i++, out_len -= sizeof(struct ib_path_rec_data)) {

include/rdma/rdma_cm.h

···
 struct rdma_route {
 	struct rdma_addr addr;
 	struct sa_path_rec *path_rec;
-	int num_paths;
+	/*
+	 * 0 - No primary nor alternate path is available
+	 * 1 - Only primary path is available
+	 * 2 - Both primary and alternate path are available
+	 */
+	int num_pri_alt_paths;
 };
 
 struct rdma_conn_param {