diff options
| author | Eli Cohen <eli@mellanox.co.il> | 2011-03-22 23:38:48 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-23 20:24:24 +0100 |
| commit | 9ace5e0176f165f04537497143506621d33a0139 (patch) | |
| tree | 4587ba19581862b2de2905f5cf6ea7f610a9d9ae /drivers/net/mlx4/pd.c | |
| parent | mlx4_core: maintain available field in bitmap allocator (diff) | |
| download | linux-9ace5e0176f165f04537497143506621d33a0139.tar.xz linux-9ace5e0176f165f04537497143506621d33a0139.zip | |
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/mlx4/pd.c')
| -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 @@ #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; |