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Commit 9ace5e01 authored by Eli Cohen's avatar Eli Cohen Committed by David S. Miller
Browse files

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: default avatarEli Cohen <eli@mellanox.co.il>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 42d1e017

drivers/net/mlx4/pd.c

+8 −0
Original line number Diff line number Diff line
@@ -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;