From: Eli Cohen <eli@mellanox.com>
Date: Tue, 14 Jul 2020 21:28:32 -0700
Subject: net/mlx5: Support setting access rights of dma addresses
Patch-mainline: v5.9-rc1
Git-commit: 1dcb6c36a5ebac46099b6363ccf8f4e7563d51e2
References: jsc#SLE-15172

mlx5_fill_page_frag_array() is used to populate dma addresses to
resources that require it, such as QPs, RQs etc. When the resource is
used, PA list permissions are ignored. For resources that use MTT list,
the user is required to provide the access rights. Subsequent patches
use resources that require MTT lists, so modify API and implementation
to support that.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/alloc.c |   11 +++++++++--
 include/linux/mlx5/driver.h                     |    1 +
 include/linux/mlx5/mlx5_ifc.h                   |    6 ++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/alloc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/alloc.c
@@ -299,11 +299,18 @@ void mlx5_fill_page_array(struct mlx5_fr
 }
 EXPORT_SYMBOL_GPL(mlx5_fill_page_array);
 
-void mlx5_fill_page_frag_array(struct mlx5_frag_buf *buf, __be64 *pas)
+void mlx5_fill_page_frag_array_perm(struct mlx5_frag_buf *buf, __be64 *pas, u8 perm)
 {
 	int i;
 
+	WARN_ON(perm & 0xfc);
 	for (i = 0; i < buf->npages; i++)
-		pas[i] = cpu_to_be64(buf->frags[i].map);
+		pas[i] = cpu_to_be64(buf->frags[i].map | perm);
+}
+EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array_perm);
+
+void mlx5_fill_page_frag_array(struct mlx5_frag_buf *buf, __be64 *pas)
+{
+	mlx5_fill_page_frag_array_perm(buf, pas, 0);
 }
 EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array);
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -975,6 +975,7 @@ void mlx5_register_debugfs(void);
 void mlx5_unregister_debugfs(void);
 
 void mlx5_fill_page_array(struct mlx5_frag_buf *buf, __be64 *pas);
+void mlx5_fill_page_frag_array_perm(struct mlx5_frag_buf *buf, __be64 *pas, u8 perm);
 void mlx5_fill_page_frag_array(struct mlx5_frag_buf *frag_buf, __be64 *pas);
 int mlx5_vector2eqn(struct mlx5_core_dev *dev, int vector, int *eqn,
 		    unsigned int *irqn);
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -10692,4 +10692,10 @@ struct mlx5_ifc_tls_progress_params_bits
 	u8         hw_offset_record_number[0x18];
 };
 
+enum {
+	MLX5_MTT_PERM_READ	= 1 << 0,
+	MLX5_MTT_PERM_WRITE	= 1 << 1,
+	MLX5_MTT_PERM_RW	= MLX5_MTT_PERM_READ | MLX5_MTT_PERM_WRITE,
+};
+
 #endif /* MLX5_IFC_H */