net/mlx5: fs, add HWS root namespace functions

Add flow steering commands structure for HW steering. Implement create,
destroy and set peer HW steering root namespace functions.

Signed-off-by: Moshe Shemesh <[email protected]>
Reviewed-by: Yevgeny Kliteynik <[email protected]>
Reviewed-by: Mark Bloch <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: mosheshemesh2

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -151,8 +151,8 @@ mlx5_core-$(CONFIG_MLX5_HW_STEERING) += steering/hws/cmd.o \
 					steering/hws/bwc.o \
 					steering/hws/debug.o \
 					steering/hws/vport.o \
-					steering/hws/bwc_complex.o
-
+					steering/hws/bwc_complex.o \
+					steering/hws/fs_hws.o
 
 #
 # SF device

drivers/net/ethernet/mellanox/mlx5/core/fs_core.h

@@ -38,6 +38,7 @@
 #include <linux/rhashtable.h>
 #include <linux/llist.h>
 #include <steering/sws/fs_dr.h>
+#include <steering/hws/fs_hws.h>
 
 #define FDB_TC_MAX_CHAIN 3
 #define FDB_FT_CHAIN (FDB_TC_MAX_CHAIN + 1)
@@ -126,7 +127,8 @@ enum fs_fte_status {
 
 enum mlx5_flow_steering_mode {
 	MLX5_FLOW_STEERING_MODE_DMFS,
-	MLX5_FLOW_STEERING_MODE_SMFS
+	MLX5_FLOW_STEERING_MODE_SMFS,
+	MLX5_FLOW_STEERING_MODE_HMFS,
 };
 
 enum mlx5_flow_steering_capabilty {
@@ -293,7 +295,10 @@ struct mlx5_flow_group {
 struct mlx5_flow_root_namespace {
 	struct mlx5_flow_namespace	ns;
 	enum   mlx5_flow_steering_mode	mode;
-	struct mlx5_fs_dr_domain	fs_dr_domain;
+	union {
+		struct mlx5_fs_dr_domain	fs_dr_domain;
+		struct mlx5_fs_hws_context	fs_hws_context;
+	};
 	enum   fs_flow_table_type	table_type;
 	struct mlx5_core_dev		*dev;
 	struct mlx5_flow_table		*root_ft;

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws.c

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2025 NVIDIA Corporation & Affiliates */
+
+#include <mlx5_core.h>
+#include <fs_core.h>
+#include <fs_cmd.h>
+#include "mlx5hws.h"
+
+#define MLX5HWS_CTX_MAX_NUM_OF_QUEUES 16
+#define MLX5HWS_CTX_QUEUE_SIZE 256
+
+static int mlx5_cmd_hws_create_ns(struct mlx5_flow_root_namespace *ns)
+{
+	struct mlx5hws_context_attr hws_ctx_attr = {};
+
+	hws_ctx_attr.queues = min_t(int, num_online_cpus(),
+				    MLX5HWS_CTX_MAX_NUM_OF_QUEUES);
+	hws_ctx_attr.queue_size = MLX5HWS_CTX_QUEUE_SIZE;
+
+	ns->fs_hws_context.hws_ctx =
+		mlx5hws_context_open(ns->dev, &hws_ctx_attr);
+	if (!ns->fs_hws_context.hws_ctx) {
+		mlx5_core_err(ns->dev, "Failed to create hws flow namespace\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int mlx5_cmd_hws_destroy_ns(struct mlx5_flow_root_namespace *ns)
+{
+	return mlx5hws_context_close(ns->fs_hws_context.hws_ctx);
+}
+
+static int mlx5_cmd_hws_set_peer(struct mlx5_flow_root_namespace *ns,
+				 struct mlx5_flow_root_namespace *peer_ns,
+				 u16 peer_vhca_id)
+{
+	struct mlx5hws_context *peer_ctx = NULL;
+
+	if (peer_ns)
+		peer_ctx = peer_ns->fs_hws_context.hws_ctx;
+	mlx5hws_context_set_peer(ns->fs_hws_context.hws_ctx, peer_ctx,
+				 peer_vhca_id);
+	return 0;
+}
+
+static const struct mlx5_flow_cmds mlx5_flow_cmds_hws = {
+	.create_ns = mlx5_cmd_hws_create_ns,
+	.destroy_ns = mlx5_cmd_hws_destroy_ns,
+	.set_peer = mlx5_cmd_hws_set_peer,
+};
+
+const struct mlx5_flow_cmds *mlx5_fs_cmd_get_hws_cmds(void)
+{
+	return &mlx5_flow_cmds_hws;
+}

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2025 NVIDIA Corporation & Affiliates */
+
+#ifndef _MLX5_FS_HWS_
+#define _MLX5_FS_HWS_
+
+#include "mlx5hws.h"
+
+struct mlx5_fs_hws_context {
+	struct mlx5hws_context	*hws_ctx;
+};
+
+#ifdef CONFIG_MLX5_HW_STEERING
+
+const struct mlx5_flow_cmds *mlx5_fs_cmd_get_hws_cmds(void);
+
+#else
+
+static inline const struct mlx5_flow_cmds *mlx5_fs_cmd_get_hws_cmds(void)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_MLX5_HWS_STEERING */
+#endif