IB/mlx4: Create paravirt contexts for VFs when master IB driver initializes

When we have VFs and PFs on same host, the VFs are activated within
the mlx4_core module before the mlx4_ib kernel module is loaded.

When the mlx4_ib module initializes the PF (master), it now creates
MAD paravirtualization contexts for any VFs that already active.
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/mlx4/mad.c

@@ -1652,6 +1652,9 @@ static int create_pv_resources(struct ib_device *ibdev, int slave, int port,
 {
 	int ret, cq_size;
 
+	if (ctx->state != DEMUX_PV_STATE_DOWN)
+		return -EEXIST;
+
 	ctx->state = DEMUX_PV_STATE_STARTING;
 	/* have QP0 only on port owner, and only if link layer is IB */
 	if (ctx->slave == mlx4_master_func_num(to_mdev(ctx->ib_dev)->dev) &&

drivers/infiniband/hw/mlx4/main.c

@@ -74,6 +74,8 @@ struct update_gid_work {
 	int			port;
 };
 
+static void do_slave_init(struct mlx4_ib_dev *ibdev, int slave, int do_init);
+
 static struct workqueue_struct *wq;
 
 static void init_query_mad(struct ib_smp *mad)
@@ -1470,6 +1472,15 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 	if (mlx4_is_mfunc(ibdev->dev))
 		init_pkeys(ibdev);
 
+	/* create paravirt contexts for any VFs which are active */
+	if (mlx4_is_master(ibdev->dev)) {
+		for (j = 0; j < MLX4_MFUNC_MAX; j++) {
+			if (j == mlx4_master_func_num(ibdev->dev))
+				continue;
+			if (mlx4_is_slave_active(ibdev->dev, j))
+				do_slave_init(ibdev, j, 1);
+		}
+	}
 	return ibdev;
 
 err_notif: