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Message-ID: <20240905062752.10883-5-saeed@kernel.org>
Date: Wed,  4 Sep 2024 23:27:39 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>,
	Gal Pressman <gal@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Yevgeny Kliteynik <kliteyn@...dia.com>,
	Itamar Gozlan <igozlan@...dia.com>
Subject: [net-next V2 04/15] net/mlx5: HWS, added tables handling

From: Yevgeny Kliteynik <kliteyn@...dia.com>

Flow tables are SW objects that are comprised of list of matchers,
that in turn define the properties of a flow to match on and set
of actions to perform on the flows in case of match hit or miss.

Reviewed-by: Itamar Gozlan <igozlan@...dia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../mlx5/core/steering/hws/mlx5hws_table.c    | 493 ++++++++++++++++++
 .../mlx5/core/steering/hws/mlx5hws_table.h    |  68 +++
 2 files changed, 561 insertions(+)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.h

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.c
new file mode 100644
index 000000000000..e7e327d9f221
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
+
+#include "mlx5hws_internal.h"
+
+u32 mlx5hws_table_get_id(struct mlx5hws_table *tbl)
+{
+	return tbl->ft_id;
+}
+
+static void hws_table_init_next_ft_attr(struct mlx5hws_table *tbl,
+					struct mlx5hws_cmd_ft_create_attr *ft_attr)
+{
+	ft_attr->type = tbl->fw_ft_type;
+	if (tbl->type == MLX5HWS_TABLE_TYPE_FDB)
+		ft_attr->level = tbl->ctx->caps->fdb_ft.max_level - 1;
+	else
+		ft_attr->level = tbl->ctx->caps->nic_ft.max_level - 1;
+	ft_attr->rtc_valid = true;
+}
+
+static void hws_table_set_cap_attr(struct mlx5hws_table *tbl,
+				   struct mlx5hws_cmd_ft_create_attr *ft_attr)
+{
+	/* Enabling reformat_en or decap_en for the first flow table
+	 * must be done when all VFs are down.
+	 * However, HWS doesn't know when it is required to create the first FT.
+	 * On the other hand, HWS doesn't use all these FT capabilities at all
+	 * (the API doesn't even provide a way to specify these flags), so we'll
+	 * just set these caps on all the flow tables.
+	 * If HCA_CAP.fdb_dynamic_tunnel is set, this constraint is N/A.
+	 */
+	if (!MLX5_CAP_ESW_FLOWTABLE(tbl->ctx->mdev, fdb_dynamic_tunnel)) {
+		ft_attr->reformat_en = true;
+		ft_attr->decap_en = true;
+	}
+}
+
+static int hws_table_up_default_fdb_miss_tbl(struct mlx5hws_table *tbl)
+{
+	struct mlx5hws_cmd_ft_create_attr ft_attr = {0};
+	struct mlx5hws_cmd_set_fte_attr fte_attr = {0};
+	struct mlx5hws_cmd_forward_tbl *default_miss;
+	struct mlx5hws_cmd_set_fte_dest dest = {0};
+	struct mlx5hws_context *ctx = tbl->ctx;
+	u8 tbl_type = tbl->type;
+
+	if (tbl->type != MLX5HWS_TABLE_TYPE_FDB)
+		return 0;
+
+	if (ctx->common_res[tbl_type].default_miss) {
+		ctx->common_res[tbl_type].default_miss->refcount++;
+		return 0;
+	}
+
+	ft_attr.type = tbl->fw_ft_type;
+	ft_attr.level = tbl->ctx->caps->fdb_ft.max_level; /* The last level */
+	ft_attr.rtc_valid = false;
+
+	dest.destination_type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+	dest.destination_id = ctx->caps->eswitch_manager_vport_number;
+
+	fte_attr.action_flags = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	fte_attr.dests_num = 1;
+	fte_attr.dests = &dest;
+
+	default_miss = mlx5hws_cmd_forward_tbl_create(ctx->mdev, &ft_attr, &fte_attr);
+	if (!default_miss) {
+		mlx5hws_err(ctx, "Failed to default miss table type: 0x%x\n", tbl_type);
+		return -EINVAL;
+	}
+
+	/* ctx->ctrl_lock must be held here */
+	ctx->common_res[tbl_type].default_miss = default_miss;
+	ctx->common_res[tbl_type].default_miss->refcount++;
+
+	return 0;
+}
+
+/* Called under ctx->ctrl_lock */
+static void hws_table_down_default_fdb_miss_tbl(struct mlx5hws_table *tbl)
+{
+	struct mlx5hws_cmd_forward_tbl *default_miss;
+	struct mlx5hws_context *ctx = tbl->ctx;
+	u8 tbl_type = tbl->type;
+
+	if (tbl->type != MLX5HWS_TABLE_TYPE_FDB)
+		return;
+
+	default_miss = ctx->common_res[tbl_type].default_miss;
+	if (--default_miss->refcount)
+		return;
+
+	mlx5hws_cmd_forward_tbl_destroy(ctx->mdev, default_miss);
+	ctx->common_res[tbl_type].default_miss = NULL;
+}
+
+static int hws_table_connect_to_default_miss_tbl(struct mlx5hws_table *tbl, u32 ft_id)
+{
+	struct mlx5hws_cmd_ft_modify_attr ft_attr = {0};
+	int ret;
+
+	if (unlikely(tbl->type != MLX5HWS_TABLE_TYPE_FDB))
+		pr_warn("HWS: invalid table type %d\n", tbl->type);
+
+	mlx5hws_cmd_set_attr_connect_miss_tbl(tbl->ctx,
+					      tbl->fw_ft_type,
+					      tbl->type,
+					      &ft_attr);
+
+	ret = mlx5hws_cmd_flow_table_modify(tbl->ctx->mdev, &ft_attr, ft_id);
+	if (ret) {
+		mlx5hws_err(tbl->ctx, "Failed to connect FT to default FDB FT\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+int mlx5hws_table_create_default_ft(struct mlx5_core_dev *mdev,
+				    struct mlx5hws_table *tbl,
+				    u32 *ft_id)
+{
+	struct mlx5hws_cmd_ft_create_attr ft_attr = {0};
+	int ret;
+
+	hws_table_init_next_ft_attr(tbl, &ft_attr);
+	hws_table_set_cap_attr(tbl, &ft_attr);
+
+	ret = mlx5hws_cmd_flow_table_create(mdev, &ft_attr, ft_id);
+	if (ret) {
+		mlx5hws_err(tbl->ctx, "Failed creating default ft\n");
+		return ret;
+	}
+
+	if (tbl->type == MLX5HWS_TABLE_TYPE_FDB) {
+		/* Take/create ref over the default miss */
+		ret = hws_table_up_default_fdb_miss_tbl(tbl);
+		if (ret) {
+			mlx5hws_err(tbl->ctx, "Failed to get default fdb miss\n");
+			goto free_ft_obj;
+		}
+		ret = hws_table_connect_to_default_miss_tbl(tbl, *ft_id);
+		if (ret) {
+			mlx5hws_err(tbl->ctx, "Failed connecting to default miss tbl\n");
+			goto down_miss_tbl;
+		}
+	}
+
+	return 0;
+
+down_miss_tbl:
+	hws_table_down_default_fdb_miss_tbl(tbl);
+free_ft_obj:
+	mlx5hws_cmd_flow_table_destroy(mdev, ft_attr.type, *ft_id);
+	return ret;
+}
+
+void mlx5hws_table_destroy_default_ft(struct mlx5hws_table *tbl,
+				      u32 ft_id)
+{
+	mlx5hws_cmd_flow_table_destroy(tbl->ctx->mdev, tbl->fw_ft_type, ft_id);
+	hws_table_down_default_fdb_miss_tbl(tbl);
+}
+
+static int hws_table_init_check_hws_support(struct mlx5hws_context *ctx,
+					    struct mlx5hws_table *tbl)
+{
+	if (!(ctx->flags & MLX5HWS_CONTEXT_FLAG_HWS_SUPPORT)) {
+		mlx5hws_err(ctx, "HWS not supported, cannot create mlx5hws_table\n");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int hws_table_init(struct mlx5hws_table *tbl)
+{
+	struct mlx5hws_context *ctx = tbl->ctx;
+	int ret;
+
+	ret = hws_table_init_check_hws_support(ctx, tbl);
+	if (ret)
+		return ret;
+
+	if (mlx5hws_table_get_fw_ft_type(tbl->type, (u8 *)&tbl->fw_ft_type)) {
+		pr_warn("HWS: invalid table type %d\n", tbl->type);
+		return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&ctx->ctrl_lock);
+	ret = mlx5hws_table_create_default_ft(tbl->ctx->mdev, tbl, &tbl->ft_id);
+	if (ret) {
+		mlx5hws_err(tbl->ctx, "Failed to create flow table object\n");
+		mutex_unlock(&ctx->ctrl_lock);
+		return ret;
+	}
+
+	ret = mlx5hws_action_get_default_stc(ctx, tbl->type);
+	if (ret)
+		goto tbl_destroy;
+
+	INIT_LIST_HEAD(&tbl->matchers_list);
+	INIT_LIST_HEAD(&tbl->default_miss.head);
+
+	mutex_unlock(&ctx->ctrl_lock);
+
+	return 0;
+
+tbl_destroy:
+	mlx5hws_table_destroy_default_ft(tbl, tbl->ft_id);
+	mutex_unlock(&ctx->ctrl_lock);
+	return ret;
+}
+
+static void hws_table_uninit(struct mlx5hws_table *tbl)
+{
+	mutex_lock(&tbl->ctx->ctrl_lock);
+	mlx5hws_action_put_default_stc(tbl->ctx, tbl->type);
+	mlx5hws_table_destroy_default_ft(tbl, tbl->ft_id);
+	mutex_unlock(&tbl->ctx->ctrl_lock);
+}
+
+struct mlx5hws_table *mlx5hws_table_create(struct mlx5hws_context *ctx,
+					   struct mlx5hws_table_attr *attr)
+{
+	struct mlx5hws_table *tbl;
+	int ret;
+
+	if (attr->type > MLX5HWS_TABLE_TYPE_FDB) {
+		mlx5hws_err(ctx, "Invalid table type %d\n", attr->type);
+		return NULL;
+	}
+
+	tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
+	if (!tbl)
+		return NULL;
+
+	tbl->ctx = ctx;
+	tbl->type = attr->type;
+	tbl->level = attr->level;
+
+	ret = hws_table_init(tbl);
+	if (ret) {
+		mlx5hws_err(ctx, "Failed to initialise table\n");
+		goto free_tbl;
+	}
+
+	mutex_lock(&ctx->ctrl_lock);
+	list_add(&tbl->tbl_list_node, &ctx->tbl_list);
+	mutex_unlock(&ctx->ctrl_lock);
+
+	return tbl;
+
+free_tbl:
+	kfree(tbl);
+	return NULL;
+}
+
+int mlx5hws_table_destroy(struct mlx5hws_table *tbl)
+{
+	struct mlx5hws_context *ctx = tbl->ctx;
+	int ret;
+
+	mutex_lock(&ctx->ctrl_lock);
+	if (!list_empty(&tbl->matchers_list)) {
+		mlx5hws_err(tbl->ctx, "Cannot destroy table containing matchers\n");
+		ret = EBUSY;
+		goto unlock_err;
+	}
+
+	if (!list_empty(&tbl->default_miss.head)) {
+		mlx5hws_err(tbl->ctx, "Cannot destroy table pointed by default miss\n");
+		ret = EBUSY;
+		goto unlock_err;
+	}
+
+	list_del_init(&tbl->tbl_list_node);
+	mutex_unlock(&ctx->ctrl_lock);
+
+	hws_table_uninit(tbl);
+	kfree(tbl);
+
+	return 0;
+
+unlock_err:
+	mutex_unlock(&ctx->ctrl_lock);
+	return ret;
+}
+
+static u32 hws_table_get_last_ft(struct mlx5hws_table *tbl)
+{
+	struct mlx5hws_matcher *matcher;
+
+	if (list_empty(&tbl->matchers_list))
+		return tbl->ft_id;
+
+	matcher = list_last_entry(&tbl->matchers_list, struct mlx5hws_matcher, list_node);
+	return matcher->end_ft_id;
+}
+
+int mlx5hws_table_ft_set_default_next_ft(struct mlx5hws_table *tbl, u32 ft_id)
+{
+	struct mlx5hws_cmd_ft_modify_attr ft_attr = {0};
+	int ret;
+
+	/* Due to FW limitation, resetting the flow table to default action will
+	 * disconnect RTC when ignore_flow_level_rtc_valid is not supported.
+	 */
+	if (!tbl->ctx->caps->nic_ft.ignore_flow_level_rtc_valid)
+		return 0;
+
+	if (tbl->type == MLX5HWS_TABLE_TYPE_FDB)
+		return hws_table_connect_to_default_miss_tbl(tbl, ft_id);
+
+	ft_attr.type = tbl->fw_ft_type;
+	ft_attr.modify_fs = MLX5_IFC_MODIFY_FLOW_TABLE_MISS_ACTION;
+	ft_attr.table_miss_action = MLX5_IFC_MODIFY_FLOW_TABLE_MISS_ACTION_DEFAULT;
+
+	ret = mlx5hws_cmd_flow_table_modify(tbl->ctx->mdev, &ft_attr, ft_id);
+	if (ret) {
+		mlx5hws_err(tbl->ctx, "Failed to set FT default miss action\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+int mlx5hws_table_ft_set_next_rtc(struct mlx5hws_context *ctx,
+				  u32 ft_id,
+				  u32 fw_ft_type,
+				  u32 rtc_0_id,
+				  u32 rtc_1_id)
+{
+	struct mlx5hws_cmd_ft_modify_attr ft_attr = {0};
+
+	ft_attr.modify_fs = MLX5_IFC_MODIFY_FLOW_TABLE_RTC_ID;
+	ft_attr.type = fw_ft_type;
+	ft_attr.rtc_id_0 = rtc_0_id;
+	ft_attr.rtc_id_1 = rtc_1_id;
+
+	return mlx5hws_cmd_flow_table_modify(ctx->mdev, &ft_attr, ft_id);
+}
+
+static int hws_table_ft_set_next_ft(struct mlx5hws_context *ctx,
+				    u32 ft_id,
+				    u32 fw_ft_type,
+				    u32 next_ft_id)
+{
+	struct mlx5hws_cmd_ft_modify_attr ft_attr = {0};
+
+	ft_attr.modify_fs = MLX5_IFC_MODIFY_FLOW_TABLE_MISS_ACTION;
+	ft_attr.table_miss_action = MLX5_IFC_MODIFY_FLOW_TABLE_MISS_ACTION_GOTO_TBL;
+	ft_attr.type = fw_ft_type;
+	ft_attr.table_miss_id = next_ft_id;
+
+	return mlx5hws_cmd_flow_table_modify(ctx->mdev, &ft_attr, ft_id);
+}
+
+int mlx5hws_table_update_connected_miss_tables(struct mlx5hws_table *dst_tbl)
+{
+	struct mlx5hws_table *src_tbl;
+	int ret;
+
+	if (list_empty(&dst_tbl->default_miss.head))
+		return 0;
+
+	list_for_each_entry(src_tbl, &dst_tbl->default_miss.head, default_miss.next) {
+		ret = mlx5hws_table_connect_to_miss_table(src_tbl, dst_tbl);
+		if (ret) {
+			mlx5hws_err(dst_tbl->ctx,
+				    "Failed to update source miss table, unexpected behavior\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+int mlx5hws_table_connect_to_miss_table(struct mlx5hws_table *src_tbl,
+					struct mlx5hws_table *dst_tbl)
+{
+	struct mlx5hws_matcher *matcher;
+	u32 last_ft_id;
+	int ret;
+
+	last_ft_id = hws_table_get_last_ft(src_tbl);
+
+	if (dst_tbl) {
+		if (list_empty(&dst_tbl->matchers_list)) {
+			/* Connect src_tbl last_ft to dst_tbl start anchor */
+			ret = hws_table_ft_set_next_ft(src_tbl->ctx,
+						       last_ft_id,
+						       src_tbl->fw_ft_type,
+						       dst_tbl->ft_id);
+			if (ret)
+				return ret;
+
+			/* Reset last_ft RTC to default RTC */
+			ret = mlx5hws_table_ft_set_next_rtc(src_tbl->ctx,
+							    last_ft_id,
+							    src_tbl->fw_ft_type,
+							    0, 0);
+			if (ret)
+				return ret;
+		} else {
+			/* Connect src_tbl last_ft to first matcher RTC */
+			matcher = list_first_entry(&dst_tbl->matchers_list,
+						   struct mlx5hws_matcher,
+						   list_node);
+			ret = mlx5hws_table_ft_set_next_rtc(src_tbl->ctx,
+							    last_ft_id,
+							    src_tbl->fw_ft_type,
+							    matcher->match_ste.rtc_0_id,
+							    matcher->match_ste.rtc_1_id);
+			if (ret)
+				return ret;
+
+			/* Reset next miss FT to default */
+			ret = mlx5hws_table_ft_set_default_next_ft(src_tbl, last_ft_id);
+			if (ret)
+				return ret;
+		}
+	} else {
+		/* Reset next miss FT to default */
+		ret = mlx5hws_table_ft_set_default_next_ft(src_tbl, last_ft_id);
+		if (ret)
+			return ret;
+
+		/* Reset last_ft RTC to default RTC */
+		ret = mlx5hws_table_ft_set_next_rtc(src_tbl->ctx,
+						    last_ft_id,
+						    src_tbl->fw_ft_type,
+						    0, 0);
+		if (ret)
+			return ret;
+	}
+
+	src_tbl->default_miss.miss_tbl = dst_tbl;
+
+	return 0;
+}
+
+static int hws_table_set_default_miss_not_valid(struct mlx5hws_table *tbl,
+						struct mlx5hws_table *miss_tbl)
+{
+	if (!tbl->ctx->caps->nic_ft.ignore_flow_level_rtc_valid) {
+		mlx5hws_err(tbl->ctx, "Default miss table is not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	if ((miss_tbl && miss_tbl->type != tbl->type)) {
+		mlx5hws_err(tbl->ctx, "Invalid arguments\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int mlx5hws_table_set_default_miss(struct mlx5hws_table *tbl,
+				   struct mlx5hws_table *miss_tbl)
+{
+	struct mlx5hws_context *ctx = tbl->ctx;
+	struct mlx5hws_table *old_miss_tbl;
+	int ret;
+
+	ret = hws_table_set_default_miss_not_valid(tbl, miss_tbl);
+	if (ret)
+		return ret;
+
+	mutex_lock(&ctx->ctrl_lock);
+
+	old_miss_tbl = tbl->default_miss.miss_tbl;
+	ret = mlx5hws_table_connect_to_miss_table(tbl, miss_tbl);
+	if (ret)
+		goto out;
+
+	if (old_miss_tbl)
+		list_del_init(&tbl->default_miss.next);
+
+	old_miss_tbl = tbl->default_miss.miss_tbl;
+	if (old_miss_tbl)
+		list_del_init(&old_miss_tbl->default_miss.head);
+
+	if (miss_tbl)
+		list_add(&tbl->default_miss.next, &miss_tbl->default_miss.head);
+
+	mutex_unlock(&ctx->ctrl_lock);
+	return 0;
+out:
+	mutex_unlock(&ctx->ctrl_lock);
+	return -ret;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.h
new file mode 100644
index 000000000000..dd50420eec9e
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_table.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
+
+#ifndef MLX5HWS_TABLE_H_
+#define MLX5HWS_TABLE_H_
+
+struct mlx5hws_default_miss {
+	/* My miss table */
+	struct mlx5hws_table *miss_tbl;
+	struct list_head next;
+	/* Tables missing to my table */
+	struct list_head head;
+};
+
+struct mlx5hws_table {
+	struct mlx5hws_context *ctx;
+	u32 ft_id;
+	enum mlx5hws_table_type type;
+	u32 fw_ft_type;
+	u32 level;
+	struct list_head matchers_list;
+	struct list_head tbl_list_node;
+	struct mlx5hws_default_miss default_miss;
+};
+
+static inline
+u32 mlx5hws_table_get_fw_ft_type(enum mlx5hws_table_type type,
+				 u8 *ret_type)
+{
+	if (type != MLX5HWS_TABLE_TYPE_FDB)
+		return -EOPNOTSUPP;
+
+	*ret_type = FS_FT_FDB;
+
+	return 0;
+}
+
+static inline
+u32 mlx5hws_table_get_res_fw_ft_type(enum mlx5hws_table_type tbl_type,
+				     bool is_mirror)
+{
+	if (tbl_type == MLX5HWS_TABLE_TYPE_FDB)
+		return is_mirror ? FS_FT_FDB_TX : FS_FT_FDB_RX;
+
+	return 0;
+}
+
+int mlx5hws_table_create_default_ft(struct mlx5_core_dev *mdev,
+				    struct mlx5hws_table *tbl,
+				    u32 *ft_id);
+
+void mlx5hws_table_destroy_default_ft(struct mlx5hws_table *tbl,
+				      u32 ft_id);
+
+int mlx5hws_table_connect_to_miss_table(struct mlx5hws_table *src_tbl,
+					struct mlx5hws_table *dst_tbl);
+
+int mlx5hws_table_update_connected_miss_tables(struct mlx5hws_table *dst_tbl);
+
+int mlx5hws_table_ft_set_default_next_ft(struct mlx5hws_table *tbl, u32 ft_id);
+
+int mlx5hws_table_ft_set_next_rtc(struct mlx5hws_context *ctx,
+				  u32 ft_id,
+				  u32 fw_ft_type,
+				  u32 rtc_0_id,
+				  u32 rtc_1_id);
+
+#endif /* MLX5HWS_TABLE_H_ */
-- 
2.46.0


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