From: Maor Dickman <maord@nvidia.com>
Date: Mon, 20 Sep 2021 10:51:05 +0300
Subject: net/mlx5: E-Switch, Use dynamic alloc for dest array
Patch-mainline: v5.16-rc1
Git-commit: 408881627ff05ee47448b930952af68470267c0f
References: jsc#SLE-19253

Use dynamic allocation for the dest array in preparation for
the next patch which increase MLX5_MAX_FLOW_FWD_VPORTS and
will cause stack allocation to be bigger than 1024 bytes.

Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c |   16 +++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -482,12 +482,12 @@ mlx5_eswitch_add_offloaded_rule(struct m
 				struct mlx5_flow_spec *spec,
 				struct mlx5_flow_attr *attr)
 {
-	struct mlx5_flow_destination dest[MLX5_MAX_FLOW_FWD_VPORTS + 1] = {};
 	struct mlx5_flow_act flow_act = { .flags = FLOW_ACT_NO_APPEND, };
 	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
 	struct mlx5_fs_chains *chains = esw_chains(esw);
 	bool split = !!(esw_attr->split_count);
 	struct mlx5_vport_tbl_attr fwd_attr;
+	struct mlx5_flow_destination *dest;
 	struct mlx5_flow_handle *rule;
 	struct mlx5_flow_table *fdb;
 	int i = 0;
@@ -495,6 +495,10 @@ mlx5_eswitch_add_offloaded_rule(struct m
 	if (esw->mode != MLX5_ESWITCH_OFFLOADS)
 		return ERR_PTR(-EOPNOTSUPP);
 
+	dest = kcalloc(MLX5_MAX_FLOW_FWD_VPORTS + 1, sizeof(*dest), GFP_KERNEL);
+	if (!dest)
+		return ERR_PTR(-ENOMEM);
+
 	flow_act.action = attr->action;
 	/* if per flow vlan pop/push is emulated, don't set that into the firmware */
 	if (!mlx5_eswitch_vlan_actions_supported(esw->dev, 1))
@@ -574,6 +578,7 @@ mlx5_eswitch_add_offloaded_rule(struct m
 	else
 		atomic64_inc(&esw->offloads.num_flows);
 
+	kfree(dest);
 	return rule;
 
 err_add_rule:
@@ -584,6 +589,7 @@ err_add_rule:
 err_esw_get:
 	esw_cleanup_dests(esw, attr);
 err_create_goto_table:
+	kfree(dest);
 	return rule;
 }
 
@@ -592,16 +598,20 @@ mlx5_eswitch_add_fwd_rule(struct mlx5_es
 			  struct mlx5_flow_spec *spec,
 			  struct mlx5_flow_attr *attr)
 {
-	struct mlx5_flow_destination dest[MLX5_MAX_FLOW_FWD_VPORTS + 1] = {};
 	struct mlx5_flow_act flow_act = { .flags = FLOW_ACT_NO_APPEND, };
 	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
 	struct mlx5_fs_chains *chains = esw_chains(esw);
 	struct mlx5_vport_tbl_attr fwd_attr;
+	struct mlx5_flow_destination *dest;
 	struct mlx5_flow_table *fast_fdb;
 	struct mlx5_flow_table *fwd_fdb;
 	struct mlx5_flow_handle *rule;
 	int i, err = 0;
 
+	dest = kcalloc(MLX5_MAX_FLOW_FWD_VPORTS + 1, sizeof(*dest), GFP_KERNEL);
+	if (!dest)
+		return ERR_PTR(-ENOMEM);
+
 	fast_fdb = mlx5_chains_get_table(chains, attr->chain, attr->prio, 0);
 	if (IS_ERR(fast_fdb)) {
 		rule = ERR_CAST(fast_fdb);
@@ -654,6 +664,7 @@ mlx5_eswitch_add_fwd_rule(struct mlx5_es
 
 	atomic64_inc(&esw->offloads.num_flows);
 
+	kfree(dest);
 	return rule;
 err_chain_src_rewrite:
 	esw_put_dest_tables_loop(esw, attr, 0, i);
@@ -661,6 +672,7 @@ err_chain_src_rewrite:
 err_get_fwd:
 	mlx5_chains_put_table(chains, attr->chain, attr->prio, 0);
 err_get_fast:
+	kfree(dest);
 	return rule;
 }