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  1. 22 Mar, 2009 7 commits
    • Lennert Buytenhek's avatar
      dsa: add switch chip cascading support · e84665c9
      Lennert Buytenhek authored 
      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: default avatarLennert Buytenhek <buytenh@marvell.com>
Tested-by: default avatarGary Thomas <gary@mlbassoc.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e84665c9
    • Lennert Buytenhek's avatar
      dsa: add support for the Marvell 88E6095/6095F switch chips · 076d3e10
      Lennert Buytenhek authored 
      Add support for the Marvell 88E6095/6095F switch chips.  These
chips are similar to the 88e6131, so we can add the support to
mv88e6131.c easily.

Thanks to Gary Thomas <gary@mlbassoc.com> and Jesper Dangaard
Brouer <hawk@diku.dk> for testing various patches.
Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
Tested-by: default avatarGary Thomas <gary@mlbassoc.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      076d3e10
    • Lennert Buytenhek's avatar
      dsa: set ->iflink on slave interfaces to the ifindex of the parent · c0840801
      Lennert Buytenhek authored 
      ..so that we can parse the DSA topology from 'ip link' output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
4: lan1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
5: lan2@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
6: lan3@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
7: lan4@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c0840801
    • Stephen Hemminger's avatar
      eql: fix non-constant printk warning · aec464bb
      Stephen Hemminger authored 
      Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aec464bb
    • Stephen Hemminger's avatar
      atm: fix non-const printk argument · 32f3dde5
      Stephen Hemminger authored 
      Change printk() argument to fix compiler warning.
Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      32f3dde5
    • Stephen Hemminger's avatar
      ipx: use constant for strings and desciptor · fa665ccf
      Stephen Hemminger authored 
      Fix compiler warning about non-const format string.
Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Acked-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fa665ccf
    • Stephen Hemminger's avatar
      snap: use const for descriptor · 7ca98fa2
      Stephen Hemminger authored 
      Protocols should be able to use constant value for the descriptor.
Minor whitespace cleanup as well
Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
Acked-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7ca98fa2
  3. 21 Mar, 2009 21 commits
  5. 20 Mar, 2009 12 commits
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