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mlx4_core: reserve UARs for userspace consumers

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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>
This commit is contained in:
Eli Cohen 2011-03-22 22:38:48 +00:00 committed by David S. Miller
parent 42d1e017e2
commit 9ace5e0176
1 changed files with 8 additions and 0 deletions
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8
drivers/net/mlx4/pd.c
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@ -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;