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+/*
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+ * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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+ *
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+ * This software is available to you under a choice of one of two
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+ * licenses. You may choose to be licensed under the terms of the GNU
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+ * General Public License (GPL) Version 2, available from the file
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+ * COPYING in the main directory of this source tree, or the
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+ * OpenIB.org BSD license below:
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+ *
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+ * Redistribution and use in source and binary forms, with or
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+ * without modification, are permitted provided that the following
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+ * conditions are met:
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+ *
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+ * - Redistributions of source code must retain the above
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+ * copyright notice, this list of conditions and the following
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+ * disclaimer.
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+ *
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+ * - Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following
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+ * disclaimer in the documentation and/or other materials
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+ * provided with the distribution.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ * SOFTWARE.
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+ */
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+
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+#include <linux/mlx5/fs.h>
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+#include <linux/mlx5/device.h>
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+#include <linux/rhashtable.h>
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+#include "en.h"
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+#include "en_tc.h"
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+
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+struct mlx5e_tc_flow {
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+ struct rhash_head node;
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+ u64 cookie;
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+ struct mlx5_flow_rule *rule;
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+};
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+
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+#define MLX5E_TC_FLOW_TABLE_NUM_ENTRIES 1024
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+#define MLX5E_TC_FLOW_TABLE_NUM_GROUPS 4
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+
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+static struct mlx5_flow_rule *mlx5e_tc_add_flow(struct mlx5e_priv *priv,
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+ u32 *match_c, u32 *match_v,
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+ u32 action, u32 flow_tag)
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+{
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+ struct mlx5_flow_destination dest = {
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+ .type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE,
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+ {.ft = priv->fts.vlan.t},
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+ };
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+ struct mlx5_flow_rule *rule;
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+ bool table_created = false;
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+
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+ if (IS_ERR_OR_NULL(priv->fts.tc.t)) {
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+ priv->fts.tc.t =
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+ mlx5_create_auto_grouped_flow_table(priv->fts.ns, 0,
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+ MLX5E_TC_FLOW_TABLE_NUM_ENTRIES,
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+ MLX5E_TC_FLOW_TABLE_NUM_GROUPS);
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+ if (IS_ERR(priv->fts.tc.t)) {
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+ netdev_err(priv->netdev,
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+ "Failed to create tc offload table\n");
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+ return ERR_CAST(priv->fts.tc.t);
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+ }
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+
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+ table_created = true;
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+ }
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+
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+ rule = mlx5_add_flow_rule(priv->fts.tc.t, MLX5_MATCH_OUTER_HEADERS,
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+ match_c, match_v,
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+ action, flow_tag,
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+ action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST ? &dest : NULL);
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+
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+ if (IS_ERR(rule) && table_created) {
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+ mlx5_destroy_flow_table(priv->fts.tc.t);
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+ priv->fts.tc.t = NULL;
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+ }
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+
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+ return rule;
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+}
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+
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+static void mlx5e_tc_del_flow(struct mlx5e_priv *priv,
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+ struct mlx5_flow_rule *rule)
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+{
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+ mlx5_del_flow_rule(rule);
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+
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+ if (!mlx5e_tc_num_filters(priv)) {
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+ mlx5_destroy_flow_table(priv->fts.tc.t);
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+ priv->fts.tc.t = NULL;
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+ }
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+}
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+
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+static const struct rhashtable_params mlx5e_tc_flow_ht_params = {
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+ .head_offset = offsetof(struct mlx5e_tc_flow, node),
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+ .key_offset = offsetof(struct mlx5e_tc_flow, cookie),
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+ .key_len = sizeof(((struct mlx5e_tc_flow *)0)->cookie),
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+ .automatic_shrinking = true,
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+};
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+
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+int mlx5e_tc_init(struct mlx5e_priv *priv)
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+{
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+ struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
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+
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+ tc->ht_params = mlx5e_tc_flow_ht_params;
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+ return rhashtable_init(&tc->ht, &tc->ht_params);
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+}
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+
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+static void _mlx5e_tc_del_flow(void *ptr, void *arg)
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+{
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+ struct mlx5e_tc_flow *flow = ptr;
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+ struct mlx5e_priv *priv = arg;
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+
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+ mlx5e_tc_del_flow(priv, flow->rule);
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+ kfree(flow);
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+}
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+
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+void mlx5e_tc_cleanup(struct mlx5e_priv *priv)
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+{
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+ struct mlx5e_tc_flow_table *tc = &priv->fts.tc;
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+
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+ rhashtable_free_and_destroy(&tc->ht, _mlx5e_tc_del_flow, priv);
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+
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+ if (!IS_ERR_OR_NULL(priv->fts.tc.t)) {
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+ mlx5_destroy_flow_table(priv->fts.tc.t);
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+ priv->fts.tc.t = NULL;
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+ }
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+}
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Amir Vadai