Merge branch 'net-mlx5-support-disabling-host-pfs'

Tariq Toukan says:

====================
net/mlx5: Support disabling host PFs

This small series by Daniel adds support for disabling host PFs.
If device is capable and configured, the driver won't access vports of
disabled host functions.
====================

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

···
 	return ERR_PTR(err);
 }
 
+static int mlx5_esw_host_functions_enabled_query(struct mlx5_eswitch *esw)
+{
+	const u32 *query_host_out;
+
+	if (!mlx5_core_is_ecpf_esw_manager(esw->dev))
+		return 0;
+
+	query_host_out = mlx5_esw_query_functions(esw->dev);
+	if (IS_ERR(query_host_out))
+		return PTR_ERR(query_host_out);
+
+	esw->esw_funcs.host_funcs_disabled =
+		MLX5_GET(query_esw_functions_out, query_host_out,
+			 host_params_context.host_pf_not_exist);
+
+	kvfree(query_host_out);
+	return 0;
+}
+
 static void mlx5_eswitch_event_handler_register(struct mlx5_eswitch *esw)
 {
 	if (esw->mode == MLX5_ESWITCH_OFFLOADS && mlx5_eswitch_is_funcs_handler(esw->dev)) {
···
 		    esw->mode == MLX5_ESWITCH_LEGACY;
 
 	/* Enable PF vport */
-	if (pf_needed) {
+	if (pf_needed && mlx5_esw_host_functions_enabled(esw->dev)) {
 		ret = mlx5_eswitch_load_pf_vf_vport(esw, MLX5_VPORT_PF,
 						    enabled_events);
 		if (ret)
 			return ret;
 	}
 
-	/* Enable external host PF HCA */
-	ret = host_pf_enable_hca(esw->dev);
-	if (ret)
-		goto pf_hca_err;
+	if (mlx5_esw_host_functions_enabled(esw->dev)) {
+		/* Enable external host PF HCA */
+		ret = host_pf_enable_hca(esw->dev);
+		if (ret)
+			goto pf_hca_err;
+	}
 
 	/* Enable ECPF vport */
 	if (mlx5_ecpf_vport_exists(esw->dev)) {
···
 	if (mlx5_ecpf_vport_exists(esw->dev))
 		mlx5_eswitch_unload_pf_vf_vport(esw, MLX5_VPORT_ECPF);
 ecpf_err:
-	host_pf_disable_hca(esw->dev);
+	if (mlx5_esw_host_functions_enabled(esw->dev))
+		host_pf_disable_hca(esw->dev);
 pf_hca_err:
-	if (pf_needed)
+	if (pf_needed && mlx5_esw_host_functions_enabled(esw->dev))
 		mlx5_eswitch_unload_pf_vf_vport(esw, MLX5_VPORT_PF);
 	return ret;
 }
···
 		mlx5_eswitch_unload_pf_vf_vport(esw, MLX5_VPORT_ECPF);
 	}
 
-	host_pf_disable_hca(esw->dev);
+	if (mlx5_esw_host_functions_enabled(esw->dev))
+		host_pf_disable_hca(esw->dev);
 
-	if (mlx5_core_is_ecpf_esw_manager(esw->dev) ||
-	    esw->mode == MLX5_ESWITCH_LEGACY)
+	if ((mlx5_core_is_ecpf_esw_manager(esw->dev) ||
+	     esw->mode == MLX5_ESWITCH_LEGACY) &&
+	    mlx5_esw_host_functions_enabled(esw->dev))
 		mlx5_eswitch_unload_pf_vf_vport(esw, MLX5_VPORT_PF);
 }
 
···
 	void *hca_caps;
 	int err;
 
-	if (!mlx5_core_is_ecpf(dev)) {
+	if (!mlx5_core_is_ecpf(dev) ||
+	    !mlx5_esw_host_functions_enabled(dev)) {
 		*max_sfs = 0;
 		return 0;
 	}
···
 
 	xa_init(&esw->vports);
 
-	err = mlx5_esw_vport_alloc(esw, idx, MLX5_VPORT_PF);
-	if (err)
-		goto err;
-	if (esw->first_host_vport == MLX5_VPORT_PF)
-		xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_HOST_FN);
-	idx++;
-
-	for (i = 0; i < mlx5_core_max_vfs(dev); i++) {
-		err = mlx5_esw_vport_alloc(esw, idx, idx);
+	if (mlx5_esw_host_functions_enabled(dev)) {
+		err = mlx5_esw_vport_alloc(esw, idx, MLX5_VPORT_PF);
 		if (err)
 			goto err;
-		xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_VF);
-		xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_HOST_FN);
+		if (esw->first_host_vport == MLX5_VPORT_PF)
+			xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_HOST_FN);
 		idx++;
+		for (i = 0; i < mlx5_core_max_vfs(dev); i++) {
+			err = mlx5_esw_vport_alloc(esw, idx, idx);
+			if (err)
+				goto err;
+			xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_VF);
+			xa_set_mark(&esw->vports, idx, MLX5_ESW_VPT_HOST_FN);
+			idx++;
+		}
 	}
+
 	base_sf_num = mlx5_sf_start_function_id(dev);
 	for (i = 0; i < mlx5_sf_max_functions(dev); i++) {
 		err = mlx5_esw_vport_alloc(esw, idx, base_sf_num + i);
···
 		goto free_esw;
 
 	esw->dev = dev;
+	dev->priv.eswitch = esw;
 	esw->manager_vport = mlx5_eswitch_manager_vport(dev);
 	esw->first_host_vport = mlx5_eswitch_first_host_vport_num(dev);
 
···
 		goto abort;
 	}
 
+	err = mlx5_esw_host_functions_enabled_query(esw);
+	if (err)
+		goto abort;
+
 	err = mlx5_esw_vports_init(esw);
 	if (err)
 		goto abort;
 
-	dev->priv.eswitch = esw;
 	err = esw_offloads_init(esw);
 	if (err)
 		goto reps_err;
···
 	mutex_lock(&esw->state_lock);
 	dev->num_ipsec_offloads--;
 	mutex_unlock(&esw->state_lock);
+}
+
+bool mlx5_esw_host_functions_enabled(const struct mlx5_core_dev *dev)
+{
+	if (!dev->priv.eswitch)
+		return true;
+
+	return !dev->priv.eswitch->esw_funcs.host_funcs_disabled;
 }

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

···
 
 struct mlx5_esw_functions {
 	struct mlx5_nb		nb;
+	bool			host_funcs_disabled;
 	u16			num_vfs;
 	u16			num_ec_vfs;
 };
···
 					 bool enable);
 int mlx5_esw_ipsec_vf_packet_offload_supported(struct mlx5_core_dev *dev,
 					       u16 vport_num);
+bool mlx5_esw_host_functions_enabled(const struct mlx5_core_dev *dev);
 #else  /* CONFIG_MLX5_ESWITCH */
 /* eswitch API stubs */
 static inline int  mlx5_eswitch_init(struct mlx5_core_dev *dev) { return 0; }
···
 }
 
 static inline void mlx5_eswitch_unblock_ipsec(struct mlx5_core_dev *dev) {}
+
+static inline bool
+mlx5_esw_host_functions_enabled(const struct mlx5_core_dev *dev)
+{
+	return true;
+}
 #endif /* CONFIG_MLX5_ESWITCH */
 
 #endif /* __MLX5_ESWITCH_H__ */

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

···
 	misc = MLX5_ADDR_OF(fte_match_param, spec->match_value,
 			    misc_parameters);
 
-	if (mlx5_core_is_ecpf_esw_manager(peer_dev)) {
+	if (mlx5_core_is_ecpf_esw_manager(peer_dev) &&
+	    mlx5_esw_host_functions_enabled(peer_dev)) {
 		peer_vport = mlx5_eswitch_get_vport(peer_esw, MLX5_VPORT_PF);
 		esw_set_peer_miss_rule_source_port(esw, peer_esw, spec,
 						   MLX5_VPORT_PF);
···
 		flows[peer_vport->index] = flow;
 	}
 
-	mlx5_esw_for_each_vf_vport(peer_esw, i, peer_vport,
-				   mlx5_core_max_vfs(peer_dev)) {
-		esw_set_peer_miss_rule_source_port(esw,
-						   peer_esw,
-						   spec, peer_vport->vport);
+	if (mlx5_esw_host_functions_enabled(esw->dev)) {
+		mlx5_esw_for_each_vf_vport(peer_esw, i, peer_vport,
+					   mlx5_core_max_vfs(peer_dev)) {
+			esw_set_peer_miss_rule_source_port(esw, peer_esw,
+							   spec,
+							   peer_vport->vport);
 
-		flow = mlx5_add_flow_rules(mlx5_eswitch_get_slow_fdb(esw),
-					   spec, &flow_act, &dest, 1);
-		if (IS_ERR(flow)) {
-			err = PTR_ERR(flow);
-			goto add_vf_flow_err;
+			flow = mlx5_add_flow_rules(mlx5_eswitch_get_slow_fdb(esw),
+						   spec, &flow_act, &dest, 1);
+			if (IS_ERR(flow)) {
+				err = PTR_ERR(flow);
+				goto add_vf_flow_err;
+			}
+			flows[peer_vport->index] = flow;
 		}
-		flows[peer_vport->index] = flow;
 	}
 
 	if (mlx5_core_ec_sriov_enabled(peer_dev)) {
···
 		mlx5_del_flow_rules(flows[peer_vport->index]);
 	}
 add_ecpf_flow_err:
-	if (mlx5_core_is_ecpf_esw_manager(peer_dev)) {
+
+	if (mlx5_core_is_ecpf_esw_manager(peer_dev) &&
+	    mlx5_esw_host_functions_enabled(peer_dev)) {
 		peer_vport = mlx5_eswitch_get_vport(peer_esw, MLX5_VPORT_PF);
 		mlx5_del_flow_rules(flows[peer_vport->index]);
 	}
···
 {
 	/* Currently, only ECPF based device has representor for host PF. */
 	if (vport_num == MLX5_VPORT_PF &&
-	    !mlx5_core_is_ecpf_esw_manager(esw->dev))
+	    (!mlx5_core_is_ecpf_esw_manager(esw->dev) ||
+	     !mlx5_esw_host_functions_enabled(esw->dev)))
 		return false;
 
 	if (vport_num == MLX5_VPORT_ECPF &&