From: Eli Cohen <eli@mellanox.co.il>
Date: Tue, 22 Mar 2011 22:38:48 +0000 (+0000)
Subject: mlx4_core: reserve UARs for userspace consumers
X-Git-Tag: MMI-PSA29.97-13-9~20061^2~45
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9ace5e0176f165f04537497143506621d33a0139;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

mlx4_core: reserve UARs for userspace consumers

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 <eli@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/mlx4/pd.c b/drivers/net/mlx4/pd.c
index 5210a0f31413..1286b886dcea 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;