dsa: add switch chip cascading support

The initial version of the DSA driver only supported a single switch
chip per network interface, while DSA-capable switch chips can be
interconnected to form a tree of switch chips.  This patch adds support
for multiple switch chips on a network interface.

An example topology for a 16-port device with an embedded CPU is as
follows:

	+-----+          +--------+       +--------+
	|     |eth0    10| switch |9    10| switch |
	| CPU +----------+        +-------+        |
	|     |          | chip 0 |       | chip 1 |
	+-----+          +---++---+       +---++---+
	                     ||               ||
	                     ||               ||
	                     ||1000baseT      ||1000baseT
	                     ||ports 1-8      ||ports 9-16

This requires a couple of interdependent changes in the DSA layer:

- The dsa platform driver data needs to be extended: there is still
  only one netdevice per DSA driver instance (eth0 in the example
  above), but each of the switch chips in the tree needs its own
  mii_bus device pointer, MII management bus address, and port name
  array. (include/net/dsa.h)  The existing in-tree dsa users need
  some small changes to deal with this. (arch/arm)

- The DSA and Ethertype DSA tagging modules need to be extended to
  use the DSA device ID field on receive and demultiplex the packet
  accordingly, and fill in the DSA device ID field on transmit
  according to which switch chip the packet is heading to.
  (net/dsa/tag_{dsa,edsa}.c)

- The concept of "CPU port", which is the switch chip port that the
  CPU is connected to (port 10 on switch chip 0 in the example), needs
  to be extended with the concept of "upstream port", which is the
  port on the switch chip that will bring us one hop closer to the CPU
  (port 10 for both switch chips in the example above).

- The dsa platform data needs to specify which ports on which switch
  chips are links to other switch chips, so that we can enable DSA
  tagging mode on them.  (For inter-switch links, we always use
  non-EtherType DSA tagging, since it has lower overhead.  The CPU
  link uses dsa or edsa tagging depending on what the 'root' switch
  chip supports.)  This is done by specifying "dsa" for the given
  port in the port array.

- The dsa platform data needs to be extended with information on via
  which port to reach any given switch chip from any given switch chip.
  This info is specified via the per-switch chip data struct ->rtable[]
  array, which gives the nexthop ports for each of the other switches
  in the tree.

For the example topology above, the dsa platform data would look
something like this:

	static struct dsa_chip_data sw[2] = {
		{
			.mii_bus	= &foo,
			.sw_addr	= 1,
			.port_names[0]	= "p1",
			.port_names[1]	= "p2",
			.port_names[2]	= "p3",
			.port_names[3]	= "p4",
			.port_names[4]	= "p5",
			.port_names[5]	= "p6",
			.port_names[6]	= "p7",
			.port_names[7]	= "p8",
			.port_names[9]	= "dsa",
			.port_names[10]	= "cpu",
			.rtable		= (s8 []){ -1, 9, },
		}, {
			.mii_bus	= &foo,
			.sw_addr	= 2,
			.port_names[0]	= "p9",
			.port_names[1]	= "p10",
			.port_names[2]	= "p11",
			.port_names[3]	= "p12",
			.port_names[4]	= "p13",
			.port_names[5]	= "p14",
			.port_names[6]	= "p15",
			.port_names[7]	= "p16",
			.port_names[10]	= "dsa",
			.rtable		= (s8 []){ 10, -1, },
		},
	},

	static struct dsa_platform_data pd = {
		.netdev		= &foo,
		.nr_switches	= 2,
		.sw		= sw,
	};

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 34 insertions, 9 deletions

diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index 0a623379789f..a4ecf625981e 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -219,14 +219,17 @@ static struct platform_device orion5x_switch_device = {
 
 void __init orion5x_eth_switch_init(struct dsa_platform_data *d, int irq)
 {
+        int i;
+
         if (irq != NO_IRQ) {
                 orion5x_switch_resources[0].start = irq;
                 orion5x_switch_resources[0].end = irq;
                 orion5x_switch_device.num_resources = 1;
         }
 
-        d->mii_bus = &orion5x_eth_shared.dev;
         d->netdev = &orion5x_eth.dev;
+        for (i = 0; i < d->nr_chips; i++)
+                d->chip[i].mii_bus = &orion5x_eth_shared.dev;
         orion5x_switch_device.dev.platform_data = d;
 
         platform_device_register(&orion5x_switch_device);
diff --git a/arch/arm/mach-orion5x/rd88f5181l-fxo-setup.c b/arch/arm/mach-orion5x/rd88f5181l-fxo-setup.c
index 15f53235ee30..9c1ca41730ba 100644
--- a/arch/arm/mach-orion5x/rd88f5181l-fxo-setup.c
+++ b/arch/arm/mach-orion5x/rd88f5181l-fxo-setup.c
@@ -94,7 +94,7 @@ static struct mv643xx_eth_platform_data rd88f5181l_fxo_eth_data = {
         .duplex         = DUPLEX_FULL,
 };
 
-static struct dsa_platform_data rd88f5181l_fxo_switch_data = {
+static struct dsa_chip_data rd88f5181l_fxo_switch_chip_data = {
         .port_names[0]  = "lan2",
         .port_names[1]  = "lan1",
         .port_names[2]  = "wan",
@@ -103,6 +103,11 @@ static struct dsa_platform_data rd88f5181l_fxo_switch_data = {
         .port_names[7]  = "lan3",
 };
 
+static struct dsa_platform_data rd88f5181l_fxo_switch_plat_data = {
+        .nr_chips       = 1,
+        .chip           = &rd88f5181l_fxo_switch_chip_data,
+};
+
 static void __init rd88f5181l_fxo_init(void)
 {
         /*
@@ -117,7 +122,7 @@ static void __init rd88f5181l_fxo_init(void)
          */
         orion5x_ehci0_init();
         orion5x_eth_init(&rd88f5181l_fxo_eth_data);
-        orion5x_eth_switch_init(&rd88f5181l_fxo_switch_data, NO_IRQ);
+        orion5x_eth_switch_init(&rd88f5181l_fxo_switch_plat_data, NO_IRQ);
         orion5x_uart0_init();
 
         orion5x_setup_dev_boot_win(RD88F5181L_FXO_NOR_BOOT_BASE,
diff --git a/arch/arm/mach-orion5x/rd88f5181l-ge-setup.c b/arch/arm/mach-orion5x/rd88f5181l-ge-setup.c
index 8ad3934399d4..ee1399ff0ced 100644
--- a/arch/arm/mach-orion5x/rd88f5181l-ge-setup.c
+++ b/arch/arm/mach-orion5x/rd88f5181l-ge-setup.c
@@ -95,7 +95,7 @@ static struct mv643xx_eth_platform_data rd88f5181l_ge_eth_data = {
         .duplex         = DUPLEX_FULL,
 };
 
-static struct dsa_platform_data rd88f5181l_ge_switch_data = {
+static struct dsa_chip_data rd88f5181l_ge_switch_chip_data = {
         .port_names[0]  = "lan2",
         .port_names[1]  = "lan1",
         .port_names[2]  = "wan",
@@ -104,6 +104,11 @@ static struct dsa_platform_data rd88f5181l_ge_switch_data = {
         .port_names[7]  = "lan3",
 };
 
+static struct dsa_platform_data rd88f5181l_ge_switch_plat_data = {
+        .nr_chips       = 1,
+        .chip           = &rd88f5181l_ge_switch_chip_data,
+};
+
 static struct i2c_board_info __initdata rd88f5181l_ge_i2c_rtc = {
         I2C_BOARD_INFO("ds1338", 0x68),
 };
@@ -122,7 +127,8 @@ static void __init rd88f5181l_ge_init(void)
          */
         orion5x_ehci0_init();
         orion5x_eth_init(&rd88f5181l_ge_eth_data);
-        orion5x_eth_switch_init(&rd88f5181l_ge_switch_data, gpio_to_irq(8));
+        orion5x_eth_switch_init(&rd88f5181l_ge_switch_plat_data,
+                                gpio_to_irq(8));
         orion5x_i2c_init();
         orion5x_uart0_init();
 
diff --git a/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c b/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
index 262e25e4dace..7737cf9a8f50 100644
--- a/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
+++ b/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
@@ -35,7 +35,7 @@ static struct mv643xx_eth_platform_data rd88f6183ap_ge_eth_data = {
         .duplex         = DUPLEX_FULL,
 };
 
-static struct dsa_platform_data rd88f6183ap_ge_switch_data = {
+static struct dsa_chip_data rd88f6183ap_ge_switch_chip_data = {
         .port_names[0]  = "lan1",
         .port_names[1]  = "lan2",
         .port_names[2]  = "lan3",
@@ -44,6 +44,11 @@ static struct dsa_platform_data rd88f6183ap_ge_switch_data = {
         .port_names[5]  = "cpu",
 };
 
+static struct dsa_platform_data rd88f6183ap_ge_switch_plat_data = {
+        .nr_chips       = 1,
+        .chip           = &rd88f6183ap_ge_switch_chip_data,
+};
+
 static struct mtd_partition rd88f6183ap_ge_partitions[] = {
         {
                 .name   = "kernel",
@@ -89,7 +94,8 @@ static void __init rd88f6183ap_ge_init(void)
          */
         orion5x_ehci0_init();
         orion5x_eth_init(&rd88f6183ap_ge_eth_data);
-        orion5x_eth_switch_init(&rd88f6183ap_ge_switch_data, gpio_to_irq(3));
+        orion5x_eth_switch_init(&rd88f6183ap_ge_switch_plat_data,
+                                gpio_to_irq(3));
         spi_register_board_info(rd88f6183ap_ge_spi_slave_info,
                                 ARRAY_SIZE(rd88f6183ap_ge_spi_slave_info));
         orion5x_spi_init();
diff --git a/arch/arm/mach-orion5x/wrt350n-v2-setup.c b/arch/arm/mach-orion5x/wrt350n-v2-setup.c
index cc8f89200865..1b4ad9d5e2eb 100644
--- a/arch/arm/mach-orion5x/wrt350n-v2-setup.c
+++ b/arch/arm/mach-orion5x/wrt350n-v2-setup.c
@@ -106,7 +106,7 @@ static struct mv643xx_eth_platform_data wrt350n_v2_eth_data = {
         .duplex         = DUPLEX_FULL,
 };
 
-static struct dsa_platform_data wrt350n_v2_switch_data = {
+static struct dsa_chip_data wrt350n_v2_switch_chip_data = {
         .port_names[0]  = "lan2",
         .port_names[1]  = "lan1",
         .port_names[2]  = "wan",
@@ -115,6 +115,11 @@ static struct dsa_platform_data wrt350n_v2_switch_data = {
         .port_names[7]  = "lan4",
 };
 
+static struct dsa_platform_data wrt350n_v2_switch_plat_data = {
+        .nr_chips       = 1,
+        .chip           = &wrt350n_v2_switch_chip_data,
+};
+
 static void __init wrt350n_v2_init(void)
 {
         /*
@@ -129,7 +134,7 @@ static void __init wrt350n_v2_init(void)
          */
         orion5x_ehci0_init();
         orion5x_eth_init(&wrt350n_v2_eth_data);
-        orion5x_eth_switch_init(&wrt350n_v2_switch_data, NO_IRQ);
+        orion5x_eth_switch_init(&wrt350n_v2_switch_plat_data, NO_IRQ);
         orion5x_uart0_init();
 
         orion5x_setup_dev_boot_win(WRT350N_V2_NOR_BOOT_BASE,