[PATCH 15/17] mlx4_core: reserve UARs for userspace consumers
From: Yevgeny Petrilin <hidden>
Date: 2011-03-07 14:33:24
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Eli Cohen <redacted> 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 <redacted> Signed-off-by: Yevgeny Petrilin <redacted> --- 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