net/mlx5: DR, Expose steering table functionality

Tables are objects which are used for storing matchers, each table
belongs to a domain and defined by the domain type. When a packet
reaches the table it is being processed by each of its matchers until a
successful match. Tables can hold multiple matchers ordered by matcher
priority. Each table has a level.
Signed-off-by: Alex Vesker <valex@mellanox.com>
Reviewed-by: Erez Shitrit <erezsh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_table.c

+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2019 Mellanox Technologies. */
+
+#include "dr_types.h"
+
+int mlx5dr_table_set_miss_action(struct mlx5dr_table *tbl,
+				 struct mlx5dr_action *action)
+{
+	struct mlx5dr_matcher *last_matcher = NULL;
+	struct mlx5dr_htbl_connect_info info;
+	struct mlx5dr_ste_htbl *last_htbl;
+	int ret;
+
+	if (action && action->action_type != DR_ACTION_TYP_FT)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&tbl->dmn->mutex);
+
+	if (!list_empty(&tbl->matcher_list))
+		last_matcher = list_last_entry(&tbl->matcher_list,
+					       struct mlx5dr_matcher,
+					       matcher_list);
+
+	if (tbl->dmn->type == MLX5DR_DOMAIN_TYPE_NIC_RX ||
+	    tbl->dmn->type == MLX5DR_DOMAIN_TYPE_FDB) {
+		if (last_matcher)
+			last_htbl = last_matcher->rx.e_anchor;
+		else
+			last_htbl = tbl->rx.s_anchor;
+
+		tbl->rx.default_icm_addr = action ?
+			action->dest_tbl.tbl->rx.s_anchor->chunk->icm_addr :
+			tbl->rx.nic_dmn->default_icm_addr;
+
+		info.type = CONNECT_MISS;
+		info.miss_icm_addr = tbl->rx.default_icm_addr;
+
+		ret = mlx5dr_ste_htbl_init_and_postsend(tbl->dmn,
+							tbl->rx.nic_dmn,
+							last_htbl,
+							&info, true);
+		if (ret) {
+			mlx5dr_dbg(tbl->dmn, "Failed to set RX miss action, ret %d\n", ret);
+			goto out;
+		}
+	}
+
+	if (tbl->dmn->type == MLX5DR_DOMAIN_TYPE_NIC_TX ||
+	    tbl->dmn->type == MLX5DR_DOMAIN_TYPE_FDB) {
+		if (last_matcher)
+			last_htbl = last_matcher->tx.e_anchor;
+		else
+			last_htbl = tbl->tx.s_anchor;
+
+		tbl->tx.default_icm_addr = action ?
+			action->dest_tbl.tbl->tx.s_anchor->chunk->icm_addr :
+			tbl->tx.nic_dmn->default_icm_addr;
+
+		info.type = CONNECT_MISS;
+		info.miss_icm_addr = tbl->tx.default_icm_addr;
+
+		ret = mlx5dr_ste_htbl_init_and_postsend(tbl->dmn,
+							tbl->tx.nic_dmn,
+							last_htbl, &info, true);
+		if (ret) {
+			mlx5dr_dbg(tbl->dmn, "Failed to set TX miss action, ret %d\n", ret);
+			goto out;
+		}
+	}
+
+	/* Release old action */
+	if (tbl->miss_action)
+		refcount_dec(&tbl->miss_action->refcount);
+
+	/* Set new miss action */
+	tbl->miss_action = action;
+	if (tbl->miss_action)
+		refcount_inc(&action->refcount);
+
+out:
+	mutex_unlock(&tbl->dmn->mutex);
+	return ret;
+}
+
+static void dr_table_uninit_nic(struct mlx5dr_table_rx_tx *nic_tbl)
+{
+	mlx5dr_htbl_put(nic_tbl->s_anchor);
+}
+
+static void dr_table_uninit_fdb(struct mlx5dr_table *tbl)
+{
+	dr_table_uninit_nic(&tbl->rx);
+	dr_table_uninit_nic(&tbl->tx);
+}
+
+static void dr_table_uninit(struct mlx5dr_table *tbl)
+{
+	mutex_lock(&tbl->dmn->mutex);
+
+	switch (tbl->dmn->type) {
+	case MLX5DR_DOMAIN_TYPE_NIC_RX:
+		dr_table_uninit_nic(&tbl->rx);
+		break;
+	case MLX5DR_DOMAIN_TYPE_NIC_TX:
+		dr_table_uninit_nic(&tbl->tx);
+		break;
+	case MLX5DR_DOMAIN_TYPE_FDB:
+		dr_table_uninit_fdb(tbl);
+		break;
+	default:
+		WARN_ON(true);
+		break;
+	}
+
+	mutex_unlock(&tbl->dmn->mutex);
+}
+
+static int dr_table_init_nic(struct mlx5dr_domain *dmn,
+			     struct mlx5dr_table_rx_tx *nic_tbl)
+{
+	struct mlx5dr_domain_rx_tx *nic_dmn = nic_tbl->nic_dmn;
+	struct mlx5dr_htbl_connect_info info;
+	int ret;
+
+	nic_tbl->default_icm_addr = nic_dmn->default_icm_addr;
+
+	nic_tbl->s_anchor = mlx5dr_ste_htbl_alloc(dmn->ste_icm_pool,
+						  DR_CHUNK_SIZE_1,
+						  MLX5DR_STE_LU_TYPE_DONT_CARE,
+						  0);
+	if (!nic_tbl->s_anchor)
+		return -ENOMEM;
+
+	info.type = CONNECT_MISS;
+	info.miss_icm_addr = nic_dmn->default_icm_addr;
+	ret = mlx5dr_ste_htbl_init_and_postsend(dmn, nic_dmn,
+						nic_tbl->s_anchor,
+						&info, true);
+	if (ret)
+		goto free_s_anchor;
+
+	mlx5dr_htbl_get(nic_tbl->s_anchor);
+
+	return 0;
+
+free_s_anchor:
+	mlx5dr_ste_htbl_free(nic_tbl->s_anchor);
+	return ret;
+}
+
+static int dr_table_init_fdb(struct mlx5dr_table *tbl)
+{
+	int ret;
+
+	ret = dr_table_init_nic(tbl->dmn, &tbl->rx);
+	if (ret)
+		return ret;
+
+	ret = dr_table_init_nic(tbl->dmn, &tbl->tx);
+	if (ret)
+		goto destroy_rx;
+
+	return 0;
+
+destroy_rx:
+	dr_table_uninit_nic(&tbl->rx);
+	return ret;
+}
+
+static int dr_table_init(struct mlx5dr_table *tbl)
+{
+	int ret = 0;
+
+	INIT_LIST_HEAD(&tbl->matcher_list);
+
+	mutex_lock(&tbl->dmn->mutex);
+
+	switch (tbl->dmn->type) {
+	case MLX5DR_DOMAIN_TYPE_NIC_RX:
+		tbl->table_type = MLX5_FLOW_TABLE_TYPE_NIC_RX;
+		tbl->rx.nic_dmn = &tbl->dmn->info.rx;
+		ret = dr_table_init_nic(tbl->dmn, &tbl->rx);
+		break;
+	case MLX5DR_DOMAIN_TYPE_NIC_TX:
+		tbl->table_type = MLX5_FLOW_TABLE_TYPE_NIC_TX;
+		tbl->tx.nic_dmn = &tbl->dmn->info.tx;
+		ret = dr_table_init_nic(tbl->dmn, &tbl->tx);
+		break;
+	case MLX5DR_DOMAIN_TYPE_FDB:
+		tbl->table_type = MLX5_FLOW_TABLE_TYPE_FDB;
+		tbl->rx.nic_dmn = &tbl->dmn->info.rx;
+		tbl->tx.nic_dmn = &tbl->dmn->info.tx;
+		ret = dr_table_init_fdb(tbl);
+		break;
+	default:
+		WARN_ON(true);
+		break;
+	}
+
+	mutex_unlock(&tbl->dmn->mutex);
+
+	return ret;
+}
+
+static int dr_table_destroy_sw_owned_tbl(struct mlx5dr_table *tbl)
+{
+	return mlx5dr_cmd_destroy_flow_table(tbl->dmn->mdev,
+					     tbl->table_id,
+					     tbl->table_type);
+}
+
+static int dr_table_create_sw_owned_tbl(struct mlx5dr_table *tbl)
+{
+	u64 icm_addr_rx = 0;
+	u64 icm_addr_tx = 0;
+	int ret;
+
+	if (tbl->rx.s_anchor)
+		icm_addr_rx = tbl->rx.s_anchor->chunk->icm_addr;
+
+	if (tbl->tx.s_anchor)
+		icm_addr_tx = tbl->tx.s_anchor->chunk->icm_addr;
+
+	ret = mlx5dr_cmd_create_flow_table(tbl->dmn->mdev,
+					   tbl->table_type,
+					   icm_addr_rx,
+					   icm_addr_tx,
+					   tbl->dmn->info.caps.max_ft_level - 1,
+					   true, false, NULL,
+					   &tbl->table_id);
+
+	return ret;
+}
+
+struct mlx5dr_table *mlx5dr_table_create(struct mlx5dr_domain *dmn, u32 level)
+{
+	struct mlx5dr_table *tbl;
+	int ret;
+
+	refcount_inc(&dmn->refcount);
+
+	tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
+	if (!tbl)
+		goto dec_ref;
+
+	tbl->dmn = dmn;
+	tbl->level = level;
+	refcount_set(&tbl->refcount, 1);
+
+	ret = dr_table_init(tbl);
+	if (ret)
+		goto free_tbl;
+
+	ret = dr_table_create_sw_owned_tbl(tbl);
+	if (ret)
+		goto uninit_tbl;
+
+	return tbl;
+
+uninit_tbl:
+	dr_table_uninit(tbl);
+free_tbl:
+	kfree(tbl);
+dec_ref:
+	refcount_dec(&dmn->refcount);
+	return NULL;
+}
+
+int mlx5dr_table_destroy(struct mlx5dr_table *tbl)
+{
+	int ret;
+
+	if (refcount_read(&tbl->refcount) > 1)
+		return -EBUSY;
+
+	ret = dr_table_destroy_sw_owned_tbl(tbl);
+	if (ret)
+		return ret;
+
+	dr_table_uninit(tbl);
+
+	if (tbl->miss_action)
+		refcount_dec(&tbl->miss_action->refcount);
+
+	refcount_dec(&tbl->dmn->refcount);
+	kfree(tbl);
+
+	return ret;
+}
+
+u32 mlx5dr_table_get_id(struct mlx5dr_table *tbl)
+{
+	return tbl->table_id;
+}