diff options
author | Eli Cohen <eli@mellanox.co.il> | 2011-03-22 18:38:48 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2011-03-23 15:24:24 -0400 |
commit | 9ace5e0176f165f04537497143506621d33a0139 (patch) | |
tree | 4587ba19581862b2de2905f5cf6ea7f610a9d9ae /drivers/net | |
parent | 42d1e017e2f040c3e3d62b6cfa3a26351a865d04 (diff) |
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>
Diffstat (limited to 'drivers/net')
-rw-r--r-- | 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 5210a0f31413..1286b886dcea 100644 --- a/drivers/net/mlx4/pd.c +++ b/drivers/net/mlx4/pd.c | |||
@@ -39,6 +39,10 @@ | |||
39 | #include "mlx4.h" | 39 | #include "mlx4.h" |
40 | #include "icm.h" | 40 | #include "icm.h" |
41 | 41 | ||
42 | enum { | ||
43 | MLX4_NUM_RESERVED_UARS = 8 | ||
44 | }; | ||
45 | |||
42 | int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn) | 46 | int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn) |
43 | { | 47 | { |
44 | struct mlx4_priv *priv = mlx4_priv(dev); | 48 | struct mlx4_priv *priv = mlx4_priv(dev); |
@@ -104,6 +108,10 @@ int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf) | |||
104 | if (!list_empty(&priv->bf_list)) | 108 | if (!list_empty(&priv->bf_list)) |
105 | uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); | 109 | uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); |
106 | else { | 110 | else { |
111 | if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) { | ||
112 | err = -ENOMEM; | ||
113 | goto out; | ||
114 | } | ||
107 | uar = kmalloc(sizeof *uar, GFP_KERNEL); | 115 | uar = kmalloc(sizeof *uar, GFP_KERNEL); |
108 | if (!uar) { | 116 | if (!uar) { |
109 | err = -ENOMEM; | 117 | err = -ENOMEM; |