mlx4_core: reserve UARs for userspace consumers (9ace5e01) · Commits · 戴 / test

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>

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;

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