net/mlx5e: Enable multi-queue and RSS for VF representors

Increased the amount of channels the representors can open to be the
amount of CPUs. The default amount opened remains one.

Used the standard NIC netdev functions to:
* Set RSS params when building the representors' params.
* Setup an indirect TIR and RQT for the representors upon
  initialization.
* Create a TTC flow table for the representors' indirect TIR (when
  creating the TTC table, mlx5e_set_ttc_basic_params() is not called,
  in order to avoid setting the inner_ttc param, which is not needed).

Added ethtool control to the representors for setting and querying
the amount of open channels. Additionally, included logic in the
representors' ethtool set channels handler which controls a
representor's vport rx rule, so that if there is one open channel
the rx rule steers traffic to the representor's direct TIR, whereas
if there is more than one channel, the rx rule steers traffic to the
new TTC flow table.

Signed-off-by: Gavi Teitz <[email protected]>
Reviewed-by: Or Gerlitz <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: Gavi Teitz

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

@@ -180,12 +180,90 @@ static int mlx5e_rep_get_sset_count(struct net_device *dev, int sset)
 	}
 }
 
+static int mlx5e_replace_rep_vport_rx_rule(struct mlx5e_priv *priv,
+					   struct mlx5_flow_destination *dest)
+{
+	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
+	struct mlx5_flow_handle *flow_rule;
+
+	flow_rule = mlx5_eswitch_create_vport_rx_rule(esw,
+						      rep->vport,
+						      dest);
+	if (IS_ERR(flow_rule))
+		return PTR_ERR(flow_rule);
+
+	mlx5_del_flow_rules(rpriv->vport_rx_rule);
+	rpriv->vport_rx_rule = flow_rule;
+	return 0;
+}
+
+static void mlx5e_rep_get_channels(struct net_device *dev,
+				   struct ethtool_channels *ch)
+{
+	struct mlx5e_priv *priv = netdev_priv(dev);
+
+	mlx5e_ethtool_get_channels(priv, ch);
+}
+
+static int mlx5e_rep_set_channels(struct net_device *dev,
+				  struct ethtool_channels *ch)
+{
+	struct mlx5e_priv *priv = netdev_priv(dev);
+	u16 curr_channels_amount = priv->channels.params.num_channels;
+	u32 new_channels_amount = ch->combined_count;
+	struct mlx5_flow_destination new_dest;
+	int err = 0;
+
+	err = mlx5e_ethtool_set_channels(priv, ch);
+	if (err)
+		return err;
+
+	if (curr_channels_amount == 1 && new_channels_amount > 1) {
+		new_dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+		new_dest.ft = priv->fs.ttc.ft.t;
+	} else if (new_channels_amount == 1 && curr_channels_amount > 1) {
+		new_dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
+		new_dest.tir_num = priv->direct_tir[0].tirn;
+	} else {
+		return 0;
+	}
+
+	err = mlx5e_replace_rep_vport_rx_rule(priv, &new_dest);
+	if (err) {
+		netdev_warn(priv->netdev, "Failed to update vport rx rule, when going from (%d) channels to (%d) channels\n",
+			    curr_channels_amount, new_channels_amount);
+		return err;
+	}
+
+	return 0;
+}
+
+static u32 mlx5e_rep_get_rxfh_key_size(struct net_device *netdev)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	return mlx5e_ethtool_get_rxfh_key_size(priv);
+}
+
+static u32 mlx5e_rep_get_rxfh_indir_size(struct net_device *netdev)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	return mlx5e_ethtool_get_rxfh_indir_size(priv);
+}
+
 static const struct ethtool_ops mlx5e_rep_ethtool_ops = {
 	.get_drvinfo	   = mlx5e_rep_get_drvinfo,
 	.get_link	   = ethtool_op_get_link,
 	.get_strings       = mlx5e_rep_get_strings,
 	.get_sset_count    = mlx5e_rep_get_sset_count,
 	.get_ethtool_stats = mlx5e_rep_get_ethtool_stats,
+	.get_channels      = mlx5e_rep_get_channels,
+	.set_channels      = mlx5e_rep_set_channels,
+	.get_rxfh_key_size   = mlx5e_rep_get_rxfh_key_size,
+	.get_rxfh_indir_size = mlx5e_rep_get_rxfh_indir_size,
 };
 
 int mlx5e_attr_get(struct net_device *dev, struct switchdev_attr *attr)
@@ -943,6 +1021,9 @@ static void mlx5e_build_rep_params(struct mlx5_core_dev *mdev,
 	params->num_tc                = 1;
 
 	mlx5_query_min_inline(mdev, &params->tx_min_inline_mode);
+
+	/* RSS */
+	mlx5e_build_rss_params(params);
 }
 
 static void mlx5e_build_rep_netdev(struct net_device *netdev)
@@ -995,14 +1076,36 @@ static void mlx5e_init_rep(struct mlx5_core_dev *mdev,
 
 	INIT_DELAYED_WORK(&priv->update_stats_work, mlx5e_update_stats_work);
 
-	priv->channels.params.num_channels = profile->max_nch(mdev);
+	priv->channels.params.num_channels = 1;
 
 	mlx5e_build_rep_params(mdev, &priv->channels.params, netdev->mtu);
 	mlx5e_build_rep_netdev(netdev);
 
 	mlx5e_timestamp_init(priv);
 }
 
+static int mlx5e_create_rep_ttc_table(struct mlx5e_priv *priv)
+{
+	struct ttc_params ttc_params = {};
+	int tt, err;
+
+	priv->fs.ns = mlx5_get_flow_namespace(priv->mdev,
+					      MLX5_FLOW_NAMESPACE_KERNEL);
+
+	/* The inner_ttc in the ttc params is intentionally not set */
+	ttc_params.any_tt_tirn = priv->direct_tir[0].tirn;
+	mlx5e_set_ttc_ft_params(&ttc_params);
+	for (tt = 0; tt < MLX5E_NUM_INDIR_TIRS; tt++)
+		ttc_params.indir_tirn[tt] = priv->indir_tir[tt].tirn;
+
+	err = mlx5e_create_ttc_table(priv, &ttc_params, &priv->fs.ttc);
+	if (err) {
+		netdev_err(priv->netdev, "Failed to create rep ttc table, err=%d\n", err);
+		return err;
+	}
+	return 0;
+}
+
 static int mlx5e_create_rep_vport_rx_rule(struct mlx5e_priv *priv)
 {
 	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
@@ -1035,24 +1138,42 @@ static int mlx5e_init_rep_rx(struct mlx5e_priv *priv)
 		return err;
 	}
 
-	err = mlx5e_create_direct_rqts(priv);
+	err = mlx5e_create_indirect_rqt(priv);
 	if (err)
 		goto err_close_drop_rq;
 
-	err = mlx5e_create_direct_tirs(priv);
+	err = mlx5e_create_direct_rqts(priv);
+	if (err)
+		goto err_destroy_indirect_rqts;
+
+	err = mlx5e_create_indirect_tirs(priv, false);
 	if (err)
 		goto err_destroy_direct_rqts;
 
-	err = mlx5e_create_rep_vport_rx_rule(priv);
+	err = mlx5e_create_direct_tirs(priv);
+	if (err)
+		goto err_destroy_indirect_tirs;
+
+	err = mlx5e_create_rep_ttc_table(priv);
 	if (err)
 		goto err_destroy_direct_tirs;
 
+	err = mlx5e_create_rep_vport_rx_rule(priv);
+	if (err)
+		goto err_destroy_ttc_table;
+
 	return 0;
 
+err_destroy_ttc_table:
+	mlx5e_destroy_ttc_table(priv, &priv->fs.ttc);
 err_destroy_direct_tirs:
 	mlx5e_destroy_direct_tirs(priv);
+err_destroy_indirect_tirs:
+	mlx5e_destroy_indirect_tirs(priv, false);
 err_destroy_direct_rqts:
 	mlx5e_destroy_direct_rqts(priv);
+err_destroy_indirect_rqts:
+	mlx5e_destroy_rqt(priv, &priv->indir_rqt);
 err_close_drop_rq:
 	mlx5e_close_drop_rq(&priv->drop_rq);
 	return err;
@@ -1063,8 +1184,11 @@ static void mlx5e_cleanup_rep_rx(struct mlx5e_priv *priv)
 	struct mlx5e_rep_priv *rpriv = priv->ppriv;
 
 	mlx5_del_flow_rules(rpriv->vport_rx_rule);
+	mlx5e_destroy_ttc_table(priv, &priv->fs.ttc);
 	mlx5e_destroy_direct_tirs(priv);
+	mlx5e_destroy_indirect_tirs(priv, false);
 	mlx5e_destroy_direct_rqts(priv);
+	mlx5e_destroy_rqt(priv, &priv->indir_rqt);
 	mlx5e_close_drop_rq(&priv->drop_rq);
 }
 
@@ -1080,20 +1204,14 @@ static int mlx5e_init_rep_tx(struct mlx5e_priv *priv)
 	return 0;
 }
 
-static int mlx5e_get_rep_max_num_channels(struct mlx5_core_dev *mdev)
-{
-#define	MLX5E_PORT_REPRESENTOR_NCH 1
-	return MLX5E_PORT_REPRESENTOR_NCH;
-}
-
 static const struct mlx5e_profile mlx5e_rep_profile = {
 	.init			= mlx5e_init_rep,
 	.init_rx		= mlx5e_init_rep_rx,
 	.cleanup_rx		= mlx5e_cleanup_rep_rx,
 	.init_tx		= mlx5e_init_rep_tx,
 	.cleanup_tx		= mlx5e_cleanup_nic_tx,
 	.update_stats           = mlx5e_rep_update_hw_counters,
-	.max_nch		= mlx5e_get_rep_max_num_channels,
+	.max_nch		= mlx5e_get_max_num_channels,
 	.update_carrier		= NULL,
 	.rx_handlers.handle_rx_cqe       = mlx5e_handle_rx_cqe_rep,
 	.rx_handlers.handle_rx_cqe_mpwqe = mlx5e_handle_rx_cqe_mpwrq,