net/mlx5: Lag, use steering to select the affinity port in LAG

Use the steering based solution for select the affinity port
when the LAG mode is based on hash policy and the device support
in port selection flow table.
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -47,16 +47,21 @@
 static DEFINE_SPINLOCK(lag_lock);
 
 static int mlx5_cmd_create_lag(struct mlx5_core_dev *dev, u8 remap_port1,
-			       u8 remap_port2, bool shared_fdb)
+			       u8 remap_port2, bool shared_fdb, u8 flags)
 {
 	u32 in[MLX5_ST_SZ_DW(create_lag_in)] = {};
 	void *lag_ctx = MLX5_ADDR_OF(create_lag_in, in, ctx);
 
 	MLX5_SET(create_lag_in, in, opcode, MLX5_CMD_OP_CREATE_LAG);
 
-	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
-	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
 	MLX5_SET(lagc, lag_ctx, fdb_selection_mode, shared_fdb);
+	if (!(flags & MLX5_LAG_FLAG_HASH_BASED)) {
+		MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
+		MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
+	} else {
+		MLX5_SET(lagc, lag_ctx, port_select_mode,
+			 MLX5_LAG_PORT_SELECT_MODE_PORT_SELECT_FT);
+	}
 
 	return mlx5_cmd_exec_in(dev, create_lag, in);
 }
@@ -199,6 +204,15 @@ static void mlx5_infer_tx_affinity_mapping(struct lag_tracker *tracker,
 		*port1 = 2;
 }
 
+static int _mlx5_modify_lag(struct mlx5_lag *ldev, u8 v2p_port1, u8 v2p_port2)
+{
+	struct mlx5_core_dev *dev0 = ldev->pf[MLX5_LAG_P1].dev;
+
+	if (ldev->flags & MLX5_LAG_FLAG_HASH_BASED)
+		return mlx5_lag_port_sel_modify(ldev, v2p_port1, v2p_port2);
+	return mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
+}
+
 void mlx5_modify_lag(struct mlx5_lag *ldev,
 		     struct lag_tracker *tracker)
 {
@@ -211,39 +225,56 @@ void mlx5_modify_lag(struct mlx5_lag *ldev,
 
 	if (v2p_port1 != ldev->v2p_map[MLX5_LAG_P1] ||
 	    v2p_port2 != ldev->v2p_map[MLX5_LAG_P2]) {
+		err = _mlx5_modify_lag(ldev, v2p_port1, v2p_port2);
+		if (err) {
+			mlx5_core_err(dev0,
+				      "Failed to modify LAG (%d)\n",
+				      err);
+			return;
+		}
 		ldev->v2p_map[MLX5_LAG_P1] = v2p_port1;
 		ldev->v2p_map[MLX5_LAG_P2] = v2p_port2;
-
 		mlx5_core_info(dev0, "modify lag map port 1:%d port 2:%d",
 			       ldev->v2p_map[MLX5_LAG_P1],
 			       ldev->v2p_map[MLX5_LAG_P2]);
-
-		err = mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
-		if (err)
-			mlx5_core_err(dev0,
-				      "Failed to modify LAG (%d)\n",
-				      err);
 	}
 }
 
+static void mlx5_lag_set_port_sel_mode(struct mlx5_lag *ldev,
+				       struct lag_tracker *tracker, u8 *flags)
+{
+	bool roce_lag = !!(*flags & MLX5_LAG_FLAG_ROCE);
+	struct lag_func *dev0 = &ldev->pf[MLX5_LAG_P1];
+
+	if (roce_lag ||
+	    !MLX5_CAP_PORT_SELECTION(dev0->dev, port_select_flow_table) ||
+	    tracker->tx_type != NETDEV_LAG_TX_TYPE_HASH)
+		return;
+	*flags |= MLX5_LAG_FLAG_HASH_BASED;
+}
+
+static char *get_str_port_sel_mode(u8 flags)
+{
+	if (flags &  MLX5_LAG_FLAG_HASH_BASED)
+		return "hash";
+	return "queue_affinity";
+}
+
 static int mlx5_create_lag(struct mlx5_lag *ldev,
 			   struct lag_tracker *tracker,
-			   bool shared_fdb)
+			   bool shared_fdb, u8 flags)
 {
 	struct mlx5_core_dev *dev0 = ldev->pf[MLX5_LAG_P1].dev;
 	struct mlx5_core_dev *dev1 = ldev->pf[MLX5_LAG_P2].dev;
 	u32 in[MLX5_ST_SZ_DW(destroy_lag_in)] = {};
 	int err;
 
-	mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[MLX5_LAG_P1],
-				       &ldev->v2p_map[MLX5_LAG_P2]);
-
-	mlx5_core_info(dev0, "lag map port 1:%d port 2:%d shared_fdb:%d",
+	mlx5_core_info(dev0, "lag map port 1:%d port 2:%d shared_fdb:%d mode:%s",
 		       ldev->v2p_map[MLX5_LAG_P1], ldev->v2p_map[MLX5_LAG_P2],
-		       shared_fdb);
+		       shared_fdb, get_str_port_sel_mode(flags));
 
 	err = mlx5_cmd_create_lag(dev0, ldev->v2p_map[MLX5_LAG_P1],
-				  ldev->v2p_map[MLX5_LAG_P2], shared_fdb);
+				  ldev->v2p_map[MLX5_LAG_P2], shared_fdb, flags);
 	if (err) {
 		mlx5_core_err(dev0,
 			      "Failed to create LAG (%d)\n",
@@ -279,16 +310,32 @@ int mlx5_activate_lag(struct mlx5_lag *ldev,
 	struct mlx5_core_dev *dev0 = ldev->pf[MLX5_LAG_P1].dev;
 	int err;
 
-	err = mlx5_create_lag(ldev, tracker, shared_fdb);
+	mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[MLX5_LAG_P1],
+				       &ldev->v2p_map[MLX5_LAG_P2]);
+	mlx5_lag_set_port_sel_mode(ldev, tracker, &flags);
+	if (flags & MLX5_LAG_FLAG_HASH_BASED) {
+		err = mlx5_lag_port_sel_create(ldev, tracker->hash_type,
+					       ldev->v2p_map[MLX5_LAG_P1],
+					       ldev->v2p_map[MLX5_LAG_P2]);
+		if (err) {
+			mlx5_core_err(dev0,
+				      "Failed to create LAG port selection(%d)\n",
+				      err);
+			return err;
+		}
+	}
+
+	err = mlx5_create_lag(ldev, tracker, shared_fdb, flags);
 	if (err) {
-		if (roce_lag) {
+		if (flags & MLX5_LAG_FLAG_HASH_BASED)
+			mlx5_lag_port_sel_destroy(ldev);
+		if (roce_lag)
 			mlx5_core_err(dev0,
 				      "Failed to activate RoCE LAG\n");
-		} else {
+		else
 			mlx5_core_err(dev0,
 				      "Failed to activate VF LAG\n"
 				      "Make sure all VFs are unbound prior to VF LAG activation or deactivation\n");
-		}
 		return err;
 	}
 
@@ -302,6 +349,7 @@ static int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 	struct mlx5_core_dev *dev0 = ldev->pf[MLX5_LAG_P1].dev;
 	u32 in[MLX5_ST_SZ_DW(destroy_lag_in)] = {};
 	bool roce_lag = __mlx5_lag_is_roce(ldev);
+	u8 flags = ldev->flags;
 	int err;
 
 	ldev->flags &= ~MLX5_LAG_MODE_FLAGS;
@@ -324,6 +372,8 @@ static int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 				      "Failed to deactivate VF LAG; driver restart required\n"
 				      "Make sure all VFs are unbound prior to VF LAG activation or deactivation\n");
 		}
+	} else if (flags & MLX5_LAG_FLAG_HASH_BASED) {
+		mlx5_lag_port_sel_destroy(ldev);
 	}
 
 	return err;

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

@@ -18,10 +18,12 @@ enum {
 	MLX5_LAG_FLAG_SRIOV  = 1 << 1,
 	MLX5_LAG_FLAG_MULTIPATH = 1 << 2,
 	MLX5_LAG_FLAG_READY = 1 << 3,
+	MLX5_LAG_FLAG_HASH_BASED = 1 << 4,
 };
 
 #define MLX5_LAG_MODE_FLAGS (MLX5_LAG_FLAG_ROCE | MLX5_LAG_FLAG_SRIOV |\
-			     MLX5_LAG_FLAG_MULTIPATH)
+			     MLX5_LAG_FLAG_MULTIPATH | \
+			     MLX5_LAG_FLAG_HASH_BASED)
 
 struct lag_func {
 	struct mlx5_core_dev *dev;