net/mlx5: E-Switch, Refactor eswitch egress acl codes

Refactor the egress acl codes so that offloads and legacy modes
can configure specifically their own needs of egress acl table,
groups and rules. While at it, restructure the eswitch egress
acl codes into eswitch directory and different files:
. Acl egress helper functions to acl_helper.c/h
. Acl egress functions used in offloads mode to acl_egress_ofld.c
. Acl egress functions used in legacy mode to acl_egress_lgy.c

This patch does not change any functionality.

Signed-off-by: Vu Pham <vuhuong@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/acl/egress_lgcy.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/acl/egress_lgcy.c
new file mode 100644
index 000000000000..d46f8b225ebe
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/acl/egress_lgcy.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2020 Mellanox Technologies Inc. All rights reserved. */
+
+#include "mlx5_core.h"
+#include "eswitch.h"
+#include "helper.h"
+#include "lgcy.h"
+
+static void esw_acl_egress_lgcy_rules_destroy(struct mlx5_vport *vport)
+{
+	esw_acl_egress_vlan_destroy(vport);
+	if (!IS_ERR_OR_NULL(vport->egress.legacy.drop_rule)) {
+		mlx5_del_flow_rules(vport->egress.legacy.drop_rule);
+		vport->egress.legacy.drop_rule = NULL;
+	}
+}
+
+static int esw_acl_egress_lgcy_groups_create(struct mlx5_eswitch *esw,
+					     struct mlx5_vport *vport)
+{
+	int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
+	struct mlx5_core_dev *dev = esw->dev;
+	struct mlx5_flow_group *drop_grp;
+	u32 *flow_group_in;
+	int err = 0;
+
+	err = esw_acl_egress_vlan_grp_create(esw, vport);
+	if (err)
+		return err;
+
+	flow_group_in = kvzalloc(inlen, GFP_KERNEL);
+	if (!flow_group_in) {
+		err = -ENOMEM;
+		goto alloc_err;
+	}
+
+	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, 1);
+	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, 1);
+	drop_grp = mlx5_create_flow_group(vport->egress.acl, flow_group_in);
+	if (IS_ERR(drop_grp)) {
+		err = PTR_ERR(drop_grp);
+		esw_warn(dev, "Failed to create E-Switch vport[%d] egress drop flow group, err(%d)\n",
+			 vport->vport, err);
+		goto drop_grp_err;
+	}
+
+	vport->egress.legacy.drop_grp = drop_grp;
+	kvfree(flow_group_in);
+	return 0;
+
+drop_grp_err:
+	kvfree(flow_group_in);
+alloc_err:
+	esw_acl_egress_vlan_grp_destroy(vport);
+	return err;
+}
+
+static void esw_acl_egress_lgcy_groups_destroy(struct mlx5_vport *vport)
+{
+	if (!IS_ERR_OR_NULL(vport->egress.legacy.drop_grp)) {
+		mlx5_destroy_flow_group(vport->egress.legacy.drop_grp);
+		vport->egress.legacy.drop_grp = NULL;
+	}
+	esw_acl_egress_vlan_grp_destroy(vport);
+}
+
+int esw_acl_egress_lgcy_setup(struct mlx5_eswitch *esw,
+			      struct mlx5_vport *vport)
+{
+	struct mlx5_flow_destination drop_ctr_dst = {};
+	struct mlx5_flow_destination *dst = NULL;
+	struct mlx5_fc *drop_counter = NULL;
+	struct mlx5_flow_act flow_act = {};
+	/* The egress acl table contains 2 rules:
+	 * 1)Allow traffic with vlan_tag=vst_vlan_id
+	 * 2)Drop all other traffic.
+	 */
+	int table_size = 2;
+	int dest_num = 0;
+	int err = 0;
+
+	if (MLX5_CAP_ESW_EGRESS_ACL(esw->dev, flow_counter)) {
+		drop_counter = mlx5_fc_create(esw->dev, false);
+		if (IS_ERR(drop_counter))
+			esw_warn(esw->dev,
+				 "vport[%d] configure egress drop rule counter err(%ld)\n",
+				 vport->vport, PTR_ERR(drop_counter));
+		vport->egress.legacy.drop_counter = drop_counter;
+	}
+
+	esw_acl_egress_lgcy_rules_destroy(vport);
+
+	if (!vport->info.vlan && !vport->info.qos) {
+		esw_acl_egress_lgcy_cleanup(esw, vport);
+		return 0;
+	}
+
+	if (!IS_ERR_OR_NULL(vport->egress.acl))
+		return 0;
+
+	vport->egress.acl = esw_acl_table_create(esw, vport->vport,
+						 MLX5_FLOW_NAMESPACE_ESW_EGRESS,
+						 table_size);
+	if (IS_ERR_OR_NULL(vport->egress.acl)) {
+		err = PTR_ERR(vport->egress.acl);
+		vport->egress.acl = NULL;
+		goto out;
+	}
+
+	err = esw_acl_egress_lgcy_groups_create(esw, vport);
+	if (err)
+		goto out;
+
+	esw_debug(esw->dev,
+		  "vport[%d] configure egress rules, vlan(%d) qos(%d)\n",
+		  vport->vport, vport->info.vlan, vport->info.qos);
+
+	/* Allowed vlan rule */
+	err = esw_egress_acl_vlan_create(esw, vport, NULL, vport->info.vlan,
+					 MLX5_FLOW_CONTEXT_ACTION_ALLOW);
+	if (err)
+		goto out;
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP;
+
+	/* Attach egress drop flow counter */
+	if (!IS_ERR_OR_NULL(drop_counter)) {
+		flow_act.action |= MLX5_FLOW_CONTEXT_ACTION_COUNT;
+		drop_ctr_dst.type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
+		drop_ctr_dst.counter_id = mlx5_fc_id(drop_counter);
+		dst = &drop_ctr_dst;
+		dest_num++;
+	}
+	vport->egress.legacy.drop_rule =
+		mlx5_add_flow_rules(vport->egress.acl, NULL,
+				    &flow_act, dst, dest_num);
+	if (IS_ERR(vport->egress.legacy.drop_rule)) {
+		err = PTR_ERR(vport->egress.legacy.drop_rule);
+		esw_warn(esw->dev,
+			 "vport[%d] configure egress drop rule failed, err(%d)\n",
+			 vport->vport, err);
+		vport->egress.legacy.drop_rule = NULL;
+		goto out;
+	}
+
+	return err;
+
+out:
+	esw_acl_egress_lgcy_cleanup(esw, vport);
+	return err;
+}
+
+void esw_acl_egress_lgcy_cleanup(struct mlx5_eswitch *esw,
+				 struct mlx5_vport *vport)
+{
+	if (IS_ERR_OR_NULL(vport->egress.acl))
+		goto clean_drop_counter;
+
+	esw_debug(esw->dev, "Destroy vport[%d] E-Switch egress ACL\n", vport->vport);
+
+	esw_acl_egress_lgcy_rules_destroy(vport);
+	esw_acl_egress_lgcy_groups_destroy(vport);
+	esw_acl_egress_table_destroy(vport);
+
+clean_drop_counter:
+	if (!IS_ERR_OR_NULL(vport->egress.legacy.drop_counter)) {
+		mlx5_fc_destroy(esw->dev, vport->egress.legacy.drop_counter);
+		vport->egress.legacy.drop_counter = NULL;
+	}
+}