net/mlx5e: Introduce root ft concept for representors netdevs

Uplink representor traffic will be redirected to an empty root ft rather
than directly to a direct tir or ttc table, this root ft will be empty and
will be used as a link for auto-chaining with ttc table or ethtool tables
in downstream patches.

On load, fs core will connect uplink rep root_ft with ttc table.  In case
ethtool steering will be used, fs core will auto connect root_ft with
the ethtool bypass tables, which will be connected with the ttc table.

vport_rx_rule[uplink_rep]->root_ft->ethtool->ttc.

For non-uplink representors, for simplicity root_ft will always point at
ttc table, hence the replace vport_rx rule logic is removed.

vport_rx_rule[non_uplink_rep]->root_ft(ttc).

For now ethtool steering support can only be available on uplink rep.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>

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

@@ -253,25 +253,6 @@ static int mlx5e_rep_set_ringparam(struct net_device *dev,
 	return mlx5e_ethtool_set_ringparam(priv, param);
 }
 
-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)
 {
@@ -284,33 +265,8 @@ 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;
+	return mlx5e_ethtool_set_channels(priv, ch);
 }
 
 static int mlx5e_rep_get_coalesce(struct net_device *netdev,
@@ -1596,6 +1552,8 @@ static void mlx5e_cleanup_rep(struct mlx5e_priv *priv)
 
 static int mlx5e_create_rep_ttc_table(struct mlx5e_priv *priv)
 {
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
 	struct ttc_params ttc_params = {};
 	int tt, err;
 
@@ -1605,6 +1563,11 @@ static int mlx5e_create_rep_ttc_table(struct mlx5e_priv *priv)
 	/* 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);
+
+	if (rep->vport != MLX5_VPORT_UPLINK)
+		/* To give uplik rep TTC a lower level for chaining from root ft */
+		ttc_params.ft_attr.level = MLX5E_TTC_FT_LEVEL + 1;
+
 	for (tt = 0; tt < MLX5E_NUM_INDIR_TIRS; tt++)
 		ttc_params.indir_tirn[tt] = priv->indir_tir[tt].tirn;
 
@@ -1616,6 +1579,51 @@ static int mlx5e_create_rep_ttc_table(struct mlx5e_priv *priv)
 	return 0;
 }
 
+static int mlx5e_create_rep_root_ft(struct mlx5e_priv *priv)
+{
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
+	struct mlx5_flow_table_attr ft_attr = {};
+	struct mlx5_flow_namespace *ns;
+	int err = 0;
+
+	if (rep->vport != MLX5_VPORT_UPLINK) {
+		/* non uplik reps will skip any bypass tables and go directly to
+		 * their own ttc
+		 */
+		rpriv->root_ft = priv->fs.ttc.ft.t;
+		return 0;
+	}
+
+	/* uplink root ft will be used to auto chain, to ethtool or ttc tables */
+	ns = mlx5_get_flow_namespace(priv->mdev, MLX5_FLOW_NAMESPACE_OFFLOADS);
+	if (!ns) {
+		netdev_err(priv->netdev, "Failed to get reps offloads namespace\n");
+		return -EOPNOTSUPP;
+	}
+
+	ft_attr.max_fte = 0; /* Empty table, miss rule will always point to next table */
+	ft_attr.level = 1;
+
+	rpriv->root_ft = mlx5_create_flow_table(ns, &ft_attr);
+	if (IS_ERR(rpriv->root_ft)) {
+		err = PTR_ERR(rpriv->root_ft);
+		rpriv->root_ft = NULL;
+	}
+
+	return err;
+}
+
+static void mlx5e_destroy_rep_root_ft(struct mlx5e_priv *priv)
+{
+	struct mlx5e_rep_priv *rpriv = priv->ppriv;
+	struct mlx5_eswitch_rep *rep = rpriv->rep;
+
+	if (rep->vport != MLX5_VPORT_UPLINK)
+		return;
+	mlx5_destroy_flow_table(rpriv->root_ft);
+}
+
 static int mlx5e_create_rep_vport_rx_rule(struct mlx5e_priv *priv)
 {
 	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
@@ -1624,11 +1632,10 @@ static int mlx5e_create_rep_vport_rx_rule(struct mlx5e_priv *priv)
 	struct mlx5_flow_handle *flow_rule;
 	struct mlx5_flow_destination dest;
 
-	dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
-	dest.tir_num = priv->direct_tir[0].tirn;
-	flow_rule = mlx5_eswitch_create_vport_rx_rule(esw,
-						      rep->vport,
-						      &dest);
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+	dest.ft = rpriv->root_ft;
+
+	flow_rule = mlx5_eswitch_create_vport_rx_rule(esw, rep->vport, &dest);
 	if (IS_ERR(flow_rule))
 		return PTR_ERR(flow_rule);
 	rpriv->vport_rx_rule = flow_rule;
@@ -1668,12 +1675,18 @@ static int mlx5e_init_rep_rx(struct mlx5e_priv *priv)
 	if (err)
 		goto err_destroy_direct_tirs;
 
-	err = mlx5e_create_rep_vport_rx_rule(priv);
+	err = mlx5e_create_rep_root_ft(priv);
 	if (err)
 		goto err_destroy_ttc_table;
 
+	err = mlx5e_create_rep_vport_rx_rule(priv);
+	if (err)
+		goto err_destroy_root_ft;
+
 	return 0;
 
+err_destroy_root_ft:
+	mlx5e_destroy_rep_root_ft(priv);
 err_destroy_ttc_table:
 	mlx5e_destroy_ttc_table(priv, &priv->fs.ttc);
 err_destroy_direct_tirs:
@@ -1694,6 +1707,7 @@ 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_rep_root_ft(priv);
 	mlx5e_destroy_ttc_table(priv, &priv->fs.ttc);
 	mlx5e_destroy_direct_tirs(priv, priv->direct_tir);
 	mlx5e_destroy_indirect_tirs(priv, false);

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

@@ -87,6 +87,7 @@ struct mlx5e_rep_priv {
 	struct mlx5_eswitch_rep *rep;
 	struct mlx5e_neigh_update_table neigh_update;
 	struct net_device      *netdev;
+	struct mlx5_flow_table *root_ft;
 	struct mlx5_flow_handle *vport_rx_rule;
 	struct list_head       vport_sqs_list;
 	struct mlx5_rep_uplink_priv uplink_priv; /* valid for uplink rep */

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

@@ -110,7 +110,7 @@
 #define ANCHOR_NUM_PRIOS 1
 #define ANCHOR_MIN_LEVEL (BY_PASS_MIN_LEVEL + 1)
 
-#define OFFLOADS_MAX_FT 1
+#define OFFLOADS_MAX_FT 2
 #define OFFLOADS_NUM_PRIOS 1
 #define OFFLOADS_MIN_LEVEL (ANCHOR_MIN_LEVEL + 1)
 
@@ -145,7 +145,7 @@ static struct init_tree_node {
 			   ADD_NS(MLX5_FLOW_TABLE_MISS_ACTION_DEF,
 				  ADD_MULTIPLE_PRIO(LAG_NUM_PRIOS,
 						    LAG_PRIO_NUM_LEVELS))),
-		  ADD_PRIO(0, OFFLOADS_MIN_LEVEL, 0, {},
+		  ADD_PRIO(0, OFFLOADS_MIN_LEVEL, 0, FS_CHAINING_CAPS,
 			   ADD_NS(MLX5_FLOW_TABLE_MISS_ACTION_DEF,
 				  ADD_MULTIPLE_PRIO(OFFLOADS_NUM_PRIOS,
 						    OFFLOADS_MAX_FT))),