[PATCH net-next 7/8] mlxsw: core_acl_flex_actions: Allow the first set to be dummy

[Ido Schimmel]

From: Jiri Pirko <j...@mellanox.com>

In Spectrum-2, the real action sets are always in KVD linear. The first
set is always empty and contains only pointer to the first real set in
KVD linear. So provide possibility to specify the first set is the dummy
one.

Signed-off-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c | 17 ++++++++++++++++-
 .../net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c 
b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
index 3c0d882ba183..9395bf385fa9 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
@@ -351,9 +351,24 @@ struct mlxsw_afa_block *mlxsw_afa_block_create(struct 
mlxsw_afa *mlxsw_afa)
        block->first_set = mlxsw_afa_set_create(true);
        if (!block->first_set)
                goto err_first_set_create;
-       block->cur_set = block->first_set;
+
+       /* In case user instructs to have dummy first set, we leave it
+        * empty here and create another, real, set right away.
+        */
+       if (mlxsw_afa->ops->dummy_first_set) {
+               block->cur_set = mlxsw_afa_set_create(false);
+               if (!block->cur_set)
+                       goto err_second_set_create;
+               block->cur_set->prev = block->first_set;
+               block->first_set->next = block->cur_set;
+       } else {
+               block->cur_set = block->first_set;
+       }
+
        return block;
 
+err_second_set_create:
+       mlxsw_afa_set_destroy(block->first_set);
 err_first_set_create:
        kfree(block);
        return NULL;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h 
b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h
index 3a155d104384..f9c77bf48e24 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.h
@@ -54,6 +54,7 @@ struct mlxsw_afa_ops {
                          bool ingress, int *p_span_id);
        void (*mirror_del)(void *priv, u8 local_in_port, int span_id,
                           bool ingress);
+       bool dummy_first_set;
 };
 
 struct mlxsw_afa *mlxsw_afa_create(unsigned int max_acts_per_set,
-- 
2.14.4