net/mlx5: E-switch, Reduce dependency on num_vfs during mode set

Currently only ECPF allows enabling eswitch when SR-IOV is disabled.

Enable PF also to enable eswitch when SR-IOV is disabled.
Load VF vports when eswitch is already enabled.
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -1652,7 +1652,17 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
 		return 0;
 
 	mutex_lock(&esw->mode_lock);
-	ret = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY, num_vfs);
+	if (esw->mode == MLX5_ESWITCH_NONE) {
+		ret = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY, num_vfs);
+	} else {
+		enum mlx5_eswitch_vport_event vport_events;
+
+		vport_events = (esw->mode == MLX5_ESWITCH_LEGACY) ?
+					MLX5_LEGACY_SRIOV_VPORT_EVENTS : MLX5_VPORT_UC_ADDR_CHANGE;
+		ret = mlx5_eswitch_load_vf_vports(esw, num_vfs, vport_events);
+		if (!ret)
+			esw->esw_funcs.num_vfs = num_vfs;
+	}
 	mutex_unlock(&esw->mode_lock);
 	return ret;
 }
@@ -1699,6 +1709,7 @@ void mlx5_eswitch_disable(struct mlx5_eswitch *esw, bool clear_vf)
 
 	mutex_lock(&esw->mode_lock);
 	mlx5_eswitch_disable_locked(esw, clear_vf);
+	esw->esw_funcs.num_vfs = 0;
 	mutex_unlock(&esw->mode_lock);
 }
 

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

@@ -1578,13 +1578,6 @@ static int esw_offloads_start(struct mlx5_eswitch *esw,
 {
 	int err, err1;
 
-	if (esw->mode != MLX5_ESWITCH_LEGACY &&
-	    !mlx5_core_is_ecpf_esw_manager(esw->dev)) {
-		NL_SET_ERR_MSG_MOD(extack,
-				   "Can't set offloads mode, SRIOV legacy not enabled");
-		return -EINVAL;
-	}
-
 	mlx5_eswitch_disable_locked(esw, false);
 	err = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_OFFLOADS,
 					 esw->dev->priv.sriov.num_vfs);
@@ -2293,7 +2286,7 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 {
 	u16 cur_mlx5_mode, mlx5_mode = 0;
 	struct mlx5_eswitch *esw;
-	int err;
+	int err = 0;
 
 	esw = mlx5_devlink_eswitch_get(devlink);
 	if (IS_ERR(esw))
@@ -2303,12 +2296,7 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
 		return -EINVAL;
 
 	mutex_lock(&esw->mode_lock);
-	err = eswitch_devlink_esw_mode_check(esw);
-	if (err)
-		goto unlock;
-
 	cur_mlx5_mode = esw->mode;
-
 	if (cur_mlx5_mode == mlx5_mode)
 		goto unlock;