mlxsw: spectrum: split base on local_ports_in_{1x, 2x} resources

When splitting a port, different local ports need to be mapped on different
systems. For example:

SN3700 (local_ports_in_2x=2):
  * Without split:
      front panel 1   --> local port 1
      front panel 2   --> local port 5
  * Split to 2:
      front panel 1s0 --> local port 1
      front panel 1s1 --> local port 3
      front panel 2   --> local port 5

SN3800 (local_ports_in_2x=1):
  * Without split:
      front panel 1 --> local port 1
      front panel 2 --> local port 3
  * Split to 2:
      front panel 1s0 --> local port 1
      front panel 1s1 --> local port 2
      front panel 2   --> local port 3

The local_ports_in_{1x, 2x} resources provide the offsets from the base
local ports according to which the new local ports can be calculated.
Signed-off-by: Shalom Toledo <shalomt@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -3699,14 +3699,14 @@ static u8 mlxsw_sp_cluster_base_port_get(u8 local_port)
 }
 
 static int mlxsw_sp_port_split_create(struct mlxsw_sp *mlxsw_sp, u8 base_port,
-				      u8 module, unsigned int count)
+				      u8 module, unsigned int count, u8 offset)
 {
 	u8 width = MLXSW_PORT_MODULE_MAX_WIDTH / count;
 	int err, i;
 
 	for (i = 0; i < count; i++) {
-		err = mlxsw_sp_port_create(mlxsw_sp, base_port + i, true,
-					   module, width, i * width);
+		err = mlxsw_sp_port_create(mlxsw_sp, base_port + i * offset,
+					   true, module, width, i * width);
 		if (err)
 			goto err_port_create;
 	}
@@ -3715,8 +3715,8 @@ static int mlxsw_sp_port_split_create(struct mlxsw_sp *mlxsw_sp, u8 base_port,
 
 err_port_create:
 	for (i--; i >= 0; i--)
-		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i))
-			mlxsw_sp_port_remove(mlxsw_sp, base_port + i);
+		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i * offset))
+			mlxsw_sp_port_remove(mlxsw_sp, base_port + i * offset);
 	return err;
 }
 
@@ -3747,11 +3747,19 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 			       struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+	u8 local_ports_in_1x, local_ports_in_2x, offset;
 	struct mlxsw_sp_port *mlxsw_sp_port;
 	u8 module, cur_width, base_port;
 	int i;
 	int err;
 
+	if (!MLXSW_CORE_RES_VALID(mlxsw_core, LOCAL_PORTS_IN_1X) ||
+	    !MLXSW_CORE_RES_VALID(mlxsw_core, LOCAL_PORTS_IN_2X))
+		return -EIO;
+
+	local_ports_in_1x = MLXSW_CORE_RES_GET(mlxsw_core, LOCAL_PORTS_IN_1X);
+	local_ports_in_2x = MLXSW_CORE_RES_GET(mlxsw_core, LOCAL_PORTS_IN_2X);
+
 	mlxsw_sp_port = mlxsw_sp->ports[local_port];
 	if (!mlxsw_sp_port) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port number \"%d\" does not exist\n",
@@ -3777,13 +3785,15 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 
 	/* Make sure we have enough slave (even) ports for the split. */
 	if (count == 2) {
+		offset = local_ports_in_2x;
 		base_port = local_port;
-		if (mlxsw_sp->ports[base_port + 1]) {
+		if (mlxsw_sp->ports[base_port + local_ports_in_2x]) {
 			netdev_err(mlxsw_sp_port->dev, "Invalid split configuration\n");
 			NL_SET_ERR_MSG_MOD(extack, "Invalid split configuration");
 			return -EINVAL;
 		}
 	} else {
+		offset = local_ports_in_1x;
 		base_port = mlxsw_sp_cluster_base_port_get(local_port);
 		if (mlxsw_sp->ports[base_port + 1] ||
 		    mlxsw_sp->ports[base_port + 3]) {
@@ -3794,10 +3804,11 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 	}
 
 	for (i = 0; i < count; i++)
-		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i))
-			mlxsw_sp_port_remove(mlxsw_sp, base_port + i);
+		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i * offset))
+			mlxsw_sp_port_remove(mlxsw_sp, base_port + i * offset);
 
-	err = mlxsw_sp_port_split_create(mlxsw_sp, base_port, module, count);
+	err = mlxsw_sp_port_split_create(mlxsw_sp, base_port, module, count,
+					 offset);
 	if (err) {
 		dev_err(mlxsw_sp->bus_info->dev, "Failed to create split ports\n");
 		goto err_port_split_create;
@@ -3814,11 +3825,19 @@ static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port,
 				 struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+	u8 local_ports_in_1x, local_ports_in_2x, offset;
 	struct mlxsw_sp_port *mlxsw_sp_port;
 	u8 cur_width, base_port;
 	unsigned int count;
 	int i;
 
+	if (!MLXSW_CORE_RES_VALID(mlxsw_core, LOCAL_PORTS_IN_1X) ||
+	    !MLXSW_CORE_RES_VALID(mlxsw_core, LOCAL_PORTS_IN_2X))
+		return -EIO;
+
+	local_ports_in_1x = MLXSW_CORE_RES_GET(mlxsw_core, LOCAL_PORTS_IN_1X);
+	local_ports_in_2x = MLXSW_CORE_RES_GET(mlxsw_core, LOCAL_PORTS_IN_2X);
+
 	mlxsw_sp_port = mlxsw_sp->ports[local_port];
 	if (!mlxsw_sp_port) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port number \"%d\" does not exist\n",
@@ -3836,6 +3855,11 @@ static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port,
 	cur_width = mlxsw_sp_port->mapping.width;
 	count = cur_width == 1 ? 4 : 2;
 
+	if (count == 2)
+		offset = local_ports_in_2x;
+	else
+		offset = local_ports_in_1x;
+
 	base_port = mlxsw_sp_cluster_base_port_get(local_port);
 
 	/* Determine which ports to remove. */
@@ -3843,8 +3867,8 @@ static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port,
 		base_port = base_port + 2;
 
 	for (i = 0; i < count; i++)
-		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i))
-			mlxsw_sp_port_remove(mlxsw_sp, base_port + i);
+		if (mlxsw_sp_port_created(mlxsw_sp, base_port + i * offset))
+			mlxsw_sp_port_remove(mlxsw_sp, base_port + i * offset);
 
 	mlxsw_sp_port_unsplit_create(mlxsw_sp, base_port, count);