net/mlx5: Support disabling host PFs

danielj-mellanox · kuba-moo · commit 520369ef43a8 · 2025-08-15T12:29:08.000-07:00
Some devices support disabling the physical function on the host. When this is configured the vports for the host functions do not exist. This patch checks if host functions are enabled before trying to access their vports. Signed-off-by: Daniel Jurgens <danielj@nvidia.com> Reviewed-by: William Tu <witu@nvidia.com> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> Link: https://patch.msgid.link/1755112796-467444-3-git-send-email-tariqt@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -1297,17 +1297,19 @@ mlx5_eswitch_enable_pf_vf_vports(struct mlx5_eswitch *esw,
 		    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)) {
@@ -1339,9 +1341,10 @@ mlx5_eswitch_enable_pf_vf_vports(struct mlx5_eswitch *esw,
 	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;
 }
@@ -1361,10 +1364,12 @@ void mlx5_eswitch_disable_pf_vf_vports(struct mlx5_eswitch *esw)
 		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);
 }
 
@@ -1693,7 +1698,8 @@ int mlx5_esw_sf_max_hpf_functions(struct mlx5_core_dev *dev, u16 *max_sfs, u16 *
 	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;
 	}
@@ -1769,21 +1775,23 @@ static int mlx5_esw_vports_init(struct mlx5_eswitch *esw)
 
 	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);
@@ -1883,6 +1891,7 @@ int mlx5_eswitch_init(struct mlx5_core_dev *dev)
 		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);
 
@@ -1901,7 +1910,6 @@ int mlx5_eswitch_init(struct mlx5_core_dev *dev)
 	if (err)
 		goto abort;
 
-	dev->priv.eswitch = esw;
 	err = esw_offloads_init(esw);
 	if (err)
 		goto reps_err;
@@ -2433,3 +2441,11 @@ void mlx5_eswitch_unblock_ipsec(struct mlx5_core_dev *dev)
 	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;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -899,6 +899,7 @@ int mlx5_esw_ipsec_vf_packet_offload_set(struct mlx5_eswitch *esw, struct mlx5_v
 					 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; }
@@ -966,6 +967,12 @@ static inline bool mlx5_eswitch_block_ipsec(struct mlx5_core_dev *dev)
 }
 
 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__ */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -1213,7 +1213,8 @@ static int esw_add_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 	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);
@@ -1239,19 +1240,21 @@ static int esw_add_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 		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)) {
@@ -1301,7 +1304,9 @@ static int esw_add_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 		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]);
 	}
@@ -4059,7 +4064,8 @@ mlx5_eswitch_vport_has_rep(const struct mlx5_eswitch *esw, u16 vport_num)
 {
 	/* 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 &&
