From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yevgeny Petrilin Subject: [PATCH 15/17] mlx4_core: reserve UARs for userspace consumers Date: Mon, 7 Mar 2011 12:18:00 +0200 Message-ID: <4D74B0D8.4070402@mellanox.co.il> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Cc: , , To: Return-path: Received: from mail.mellanox.co.il ([194.90.237.43]:35932 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751871Ab1CGOdY (ORCPT ); Mon, 7 Mar 2011 09:33:24 -0500 Sender: netdev-owner@vger.kernel.org List-ID: From: Eli Cohen Do not allow a kernel consumer to allocate a UAR to serve for blue flame if the number of available UARs gets below MLX4_NUM_RESERVED_UARS (currently 8). This will allow userspace apps to open a device file and run things like ibv_devinfo. Signed-off-by: Eli Cohen Signed-off-by: Yevgeny Petrilin --- drivers/net/mlx4/pd.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/drivers/net/mlx4/pd.c b/drivers/net/mlx4/pd.c index 5210a0f..1286b88 100644 --- a/drivers/net/mlx4/pd.c +++ b/drivers/net/mlx4/pd.c @@ -39,6 +39,10 @@ #include "mlx4.h" #include "icm.h" +enum { + MLX4_NUM_RESERVED_UARS = 8 +}; + int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn) { struct mlx4_priv *priv = mlx4_priv(dev); @@ -104,6 +108,10 @@ int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf) if (!list_empty(&priv->bf_list)) uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); else { + if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) { + err = -ENOMEM; + goto out; + } uar = kmalloc(sizeof *uar, GFP_KERNEL); if (!uar) { err = -ENOMEM; -- 1.6.0.2