RDMA/rxe: Distinguish between down links and disabled links

In ib_query_port(), use the netdev's IFF_UP flag to determine phys_state
(flag set = down = POLLING, flag clear = disabled = DISABLED).

Callers can then use the phys_state field to distinguish between links
which have a dead partner, cable missing, etc., from links which are
turned off on the local node. This is useful for HA and supportability.
Signed-off-by: Andrew Boyer <andrew.boyer@dell.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rxe/rxe.h

@@ -65,8 +65,9 @@
  */
 #define RXE_UVERBS_ABI_VERSION		2
 
-#define IB_PHYS_STATE_LINK_UP		(5)
-#define IB_PHYS_STATE_LINK_DOWN		(3)
+#define RDMA_LINK_PHYS_STATE_LINK_UP	(5)
+#define RDMA_LINK_PHYS_STATE_DISABLED	(3)
+#define RDMA_LINK_PHYS_STATE_POLLING	(2)
 
 #define RXE_ROCE_V2_SPORT		(0xc000)
 

drivers/infiniband/sw/rxe/rxe_net.c

@@ -607,7 +607,6 @@ void rxe_port_up(struct rxe_dev *rxe)
 
 	port = &rxe->port;
 	port->attr.state = IB_PORT_ACTIVE;
-	port->attr.phys_state = IB_PHYS_STATE_LINK_UP;
 
 	rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
 	dev_info(&rxe->ib_dev.dev, "set active\n");
@@ -620,7 +619,6 @@ void rxe_port_down(struct rxe_dev *rxe)
 
 	port = &rxe->port;
 	port->attr.state = IB_PORT_DOWN;
-	port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN;
 
 	rxe_port_event(rxe, IB_EVENT_PORT_ERR);
 	dev_info(&rxe->ib_dev.dev, "set down\n");

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -71,6 +71,14 @@ static int rxe_query_port(struct ib_device *dev,
 	mutex_lock(&rxe->usdev_lock);
 	rc = ib_get_eth_speed(dev, port_num, &attr->active_speed,
 			      &attr->active_width);
+
+	if (attr->state == IB_PORT_ACTIVE)
+		attr->phys_state = RDMA_LINK_PHYS_STATE_LINK_UP;
+	else if (dev_get_flags(rxe->ndev) & IFF_UP)
+		attr->phys_state = RDMA_LINK_PHYS_STATE_POLLING;
+	else
+		attr->phys_state = RDMA_LINK_PHYS_STATE_DISABLED;
+
 	mutex_unlock(&rxe->usdev_lock);
 
 out: