[infiniband] Report IB link status as IPoIB netdevice status

src/drivers/net/ipoib.c

 #include <string.h>
 #include <byteswap.h>
 #include <errno.h>
+#include <gpxe/errortab.h>
 #include <gpxe/if_arp.h>
 #include <gpxe/iobuf.h>
 #include <gpxe/netdevice.h>
 			  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff },
 };
 
+/** Link status for "broadcast join in progress" */
+#define EINPROGRESS_JOINING ( EINPROGRESS | EUNIQ_01 )
+
+/** Human-readable message for the link status */
+struct errortab ipoib_errors[] __errortab = {
+	{ EINPROGRESS_JOINING, "Joining" },
+};
+
 /****************************************************************************
  *
  * IPoIB peer cache
 	ipoib->broadcast.gid.u.words[2] = htons ( ibdev->pkey );
 
 	/* Set net device link state to reflect Infiniband link state */
-	if ( ib_link_ok ( ibdev ) ) {
-		netdev_link_up ( netdev );
-	} else {
-		netdev_link_down ( netdev );
-	}
+	rc = ib_link_rc ( ibdev );
+	netdev_link_err ( netdev, ( rc ? rc : -EINPROGRESS_JOINING ) );
 
 	/* Join new broadcast group */
 	if ( ib_link_ok ( ibdev ) &&
 	     ( ( rc = ipoib_join_broadcast_group ( ipoib ) ) != 0 ) ) {
 		DBGC ( ipoib, "IPoIB %p could not rejoin broadcast group: "
 		       "%s\n", ipoib, strerror ( rc ) );
+		netdev_link_err ( netdev, rc );
 		return;
 	}
 }

src/include/gpxe/infiniband.h

 			     struct ib_queue_pair *qp );
 extern int ib_open ( struct ib_device *ibdev );
 extern void ib_close ( struct ib_device *ibdev );
+extern int ib_link_rc ( struct ib_device *ibdev );
 extern int ib_mcast_attach ( struct ib_device *ibdev, struct ib_queue_pair *qp,
 			     struct ib_gid *gid );
 extern void ib_mcast_detach ( struct ib_device *ibdev,

src/net/infiniband.c

 #include <errno.h>
 #include <assert.h>
 #include <gpxe/list.h>
+#include <gpxe/errortab.h>
 #include <gpxe/if_arp.h>
 #include <gpxe/netdevice.h>
 #include <gpxe/iobuf.h>
 /** List of open Infiniband devices, in reverse order of opening */
 static struct list_head open_ib_devices = LIST_HEAD_INIT ( open_ib_devices );
 
+/* Disambiguate the various possible EINPROGRESSes */
+#define EINPROGRESS_INIT ( EINPROGRESS | EUNIQ_01 )
+#define EINPROGRESS_ARMED ( EINPROGRESS | EUNIQ_02 )
+
+/** Human-readable message for the link statuses */
+struct errortab infiniband_errors[] __errortab = {
+	{ EINPROGRESS_INIT, "Initialising" },
+	{ EINPROGRESS_ARMED, "Armed" },
+};
+
 /***************************************************************************
  *
  * Completion queues
 	}
 }
 
+/**
+ * Get link state
+ *
+ * @v ibdev		Infiniband device
+ * @ret rc		Link status code
+ */
+int ib_link_rc ( struct ib_device *ibdev ) {
+	switch ( ibdev->port_state ) {
+	case IB_PORT_STATE_DOWN:	return -ENOTCONN;
+	case IB_PORT_STATE_INIT:	return -EINPROGRESS_INIT;
+	case IB_PORT_STATE_ARMED:	return -EINPROGRESS_ARMED;
+	case IB_PORT_STATE_ACTIVE:	return 0;
+	default:			return -EINVAL;
+	}
+}
+
 /***************************************************************************
  *
  * Multicast
 		ib_set_drvdata ( ibdev, drv_priv );
 		INIT_LIST_HEAD ( &ibdev->cqs );
 		INIT_LIST_HEAD ( &ibdev->qps );
+		ibdev->port_state = IB_PORT_STATE_DOWN;
 		ibdev->lid = IB_LID_NONE;
 		ibdev->pkey = IB_PKEY_NONE;
 	}