net/mlx5: Lag, Control MultiPort E-Switch single FDB mode

MultiPort E-Switch builds on newer hardware's capabilities and introduces
a mode where a single E-Switch is used and all the vports and physical
ports on the NIC are connected to it.

The new mode will allow in the future a decrease in the memory used by the
driver and advanced features that aren't possible today.

This represents a big change in the current E-Switch implantation in mlx5.
Currently, by default, each E-Switch manager manages its E-Switch.
Steering rules in each E-Switch can only forward traffic to the native
physical port associated with that E-Switch. While there are ways to target
non-native physical ports, for example using a bond or via special TC
rules. None of the ways allows a user to configure the driver
to operate by default in such a mode nor can the driver decide
to move to this mode by default as it's user configuration-driven right now.

While MultiPort E-Switch single FDB mode is the preferred mode, older
generations of ConnectX hardware couldn't support this mode so it was never
implemented. Now that there is capable hardware present, start the
transition to having this mode by default.

Introduce a devlink parameter to control MultiPort E-Switch single FDB mode.
This will allow users to select this mode on their system right now
and in the future will allow the driver to move to this mode by default.

Example:
    $ devlink dev param set pci/0000:00:0b.0 name esw_multiport value 1 \
                  cmode runtime

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

1 files changed, 2 insertions, 20 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 2d06b4412762..dcfeb0077152 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2152,9 +2152,6 @@ static void mlx5e_tc_del_fdb_flow(struct mlx5e_priv *priv,
 	free_branch_attr(flow, attr->branch_true);
 	free_branch_attr(flow, attr->branch_false);
 
-	if (flow->attr->lag.count)
-		mlx5_lag_del_mpesw_rule(esw->dev);
-
 	kvfree(attr->esw_attr->rx_tun_attr);
 	kvfree(attr->parse_attr);
 	kfree(flow->attr);
@@ -4314,12 +4311,7 @@ static bool is_lag_dev(struct mlx5e_priv *priv,
 
 static bool is_multiport_eligible(struct mlx5e_priv *priv, struct net_device *out_dev)
 {
-	if (same_hw_reps(priv, out_dev) &&
-	    MLX5_CAP_PORT_SELECTION(priv->mdev, port_select_flow_table) &&
-	    MLX5_CAP_GEN(priv->mdev, create_lag_when_not_master_up))
-		return true;
-
-	return false;
+	return same_hw_reps(priv, out_dev) && mlx5_lag_mpesw_is_activated(priv->mdev);
 }
 
 bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
@@ -4621,7 +4613,6 @@ __mlx5e_add_fdb_flow(struct mlx5e_priv *priv,
 		     struct mlx5_core_dev *in_mdev)
 {
 	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
-	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
 	struct netlink_ext_ack *extack = f->common.extack;
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
 	struct mlx5e_tc_flow *flow;
@@ -4654,26 +4645,17 @@ __mlx5e_add_fdb_flow(struct mlx5e_priv *priv,
 	if (err)
 		goto err_free;
 
-	if (flow->attr->lag.count) {
-		err = mlx5_lag_add_mpesw_rule(esw->dev);
-		if (err)
-			goto err_free;
-	}
-
 	err = mlx5e_tc_add_fdb_flow(priv, flow, extack);
 	complete_all(&flow->init_done);
 	if (err) {
 		if (!(err == -ENETUNREACH && mlx5_lag_is_multipath(in_mdev)))
-			goto err_lag;
+			goto err_free;
 
 		add_unready_flow(flow);
 	}
 
 	return flow;
 
-err_lag:
-	if (flow->attr->lag.count)
-		mlx5_lag_del_mpesw_rule(esw->dev);
 err_free:
 	mlx5e_flow_put(priv, flow);
 out: