net/mlx5e: TX latency optimization to save DMA reads

[deliverable/linux.git] / drivers / net / ethernet / mellanox / mlx5 / core / uar.c

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/uar.c b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
index 9ef85873ceea8203655c8e63cdc4601d15088157..eb05c845ece9247e7e54fee5880ad27be7be7253 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/uar.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
@@ -32,6 +32,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/io-mapping.h>
 #include <linux/mlx5/driver.h>
 #include <linux/mlx5/cmd.h>
 #include "mlx5_core.h"
@@ -246,6 +247,10 @@ int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
                goto err_free_uar;
        }
 
+       if (mdev->priv.bf_mapping)
+               uar->bf_map = io_mapping_map_wc(mdev->priv.bf_mapping,
+                                               uar->index << PAGE_SHIFT);
+
        return 0;
 
 err_free_uar:
@@ -257,6 +262,7 @@ EXPORT_SYMBOL(mlx5_alloc_map_uar);
 
 void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
 {
+       io_mapping_unmap(uar->bf_map);
        iounmap(uar->map);
        mlx5_cmd_free_uar(mdev, uar->index);
 }