From 91da11f870f00a3322b81c73042291d7f0be5a17 Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Tue, 7 Oct 2008 13:44:02 +0000 Subject: net: Distributed Switch Architecture protocol support Distributed Switch Architecture is a protocol for managing hardware switch chips. It consists of a set of MII management registers and commands to configure the switch, and an ethernet header format to signal which of the ports of the switch a packet was received from or is intended to be sent to. The switches that this driver supports are typically embedded in access points and routers, and a typical setup with a DSA switch looks something like this: +-----------+ +-----------+ | | RGMII | | | +-------+ +------ 1000baseT MDI ("WAN") | | | 6-port +------ 1000baseT MDI ("LAN1") | CPU | | ethernet +------ 1000baseT MDI ("LAN2") | |MIImgmt| switch +------ 1000baseT MDI ("LAN3") | +-------+ w/5 PHYs +------ 1000baseT MDI ("LAN4") | | | | +-----------+ +-----------+ The switch driver presents each port on the switch as a separate network interface to Linux, polls the switch to maintain software link state of those ports, forwards MII management interface accesses to those network interfaces (e.g. as done by ethtool) to the switch, and exposes the switch's hardware statistics counters via the appropriate Linux kernel interfaces. This initial patch supports the MII management interface register layout of the Marvell 88E6123, 88E6161 and 88E6165 switch chips, and supports the "Ethertype DSA" packet tagging format. (There is no officially registered ethertype for the Ethertype DSA packet format, so we just grab a random one. The ethertype to use is programmed into the switch, and the switch driver uses the value of ETH_P_EDSA for this, so this define can be changed at any time in the future if the one we chose is allocated to another protocol or if Ethertype DSA gets its own officially registered ethertype, and everything will continue to work.) Signed-off-by: Lennert Buytenhek Tested-by: Nicolas Pitre Tested-by: Byron Bradley Tested-by: Tim Ellis Tested-by: Peter van Valderen Tested-by: Dirk Teurlings Signed-off-by: David S. Miller --- include/net/dsa.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/net/dsa.h (limited to 'include/net/dsa.h') diff --git a/include/net/dsa.h b/include/net/dsa.h new file mode 100644 index 000000000000..dc4784f54520 --- /dev/null +++ b/include/net/dsa.h @@ -0,0 +1,34 @@ +/* + * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips + * Copyright (c) 2008 Marvell Semiconductor + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef __LINUX_NET_DSA_H +#define __LINUX_NET_DSA_H + +#define DSA_MAX_PORTS 12 + +struct dsa_platform_data { + /* + * Reference to a Linux network interface that connects + * to the switch chip. + */ + struct device *netdev; + + /* + * How to access the switch configuration registers, and + * the names of the switch ports (use "cpu" to designate + * the switch port that the cpu is connected to). + */ + struct device *mii_bus; + int sw_addr; + char *port_names[DSA_MAX_PORTS]; +}; + + +#endif -- cgit v1.2.3 From cf85d08fdf4548ee46657ccfb7f9949a85145db5 Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Tue, 7 Oct 2008 13:45:02 +0000 Subject: dsa: add support for original DSA tagging format Most of the DSA switches currently in the field do not support the Ethertype DSA tagging format that one of the previous patches added support for, but only the original DSA tagging format. The original DSA tagging format carries the same information as the Ethertype DSA tagging format, but with the difference that it does not have an ethertype field. In other words, when receiving a packet that is tagged with an original DSA tag, there is no way of telling in eth_type_trans() that this packet is in fact a DSA-tagged packet. This patch adds a hook into eth_type_trans() which is only compiled in if support for a switch chip that doesn't support Ethertype DSA is selected, and which checks whether there is a DSA switch driver instance attached to this network device which uses the old tag format. If so, it sets the protocol field to ETH_P_DSA without looking at the packet, so that the packet ends up in the right place. Signed-off-by: Lennert Buytenhek Tested-by: Nicolas Pitre Tested-by: Peter van Valderen Tested-by: Dirk Teurlings Signed-off-by: David S. Miller --- include/net/dsa.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/net/dsa.h') diff --git a/include/net/dsa.h b/include/net/dsa.h index dc4784f54520..72e509b6a12e 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -30,5 +30,7 @@ struct dsa_platform_data { char *port_names[DSA_MAX_PORTS]; }; +extern bool dsa_uses_dsa_tags(void *dsa_ptr); + #endif -- cgit v1.2.3 From 396138f03f4521c55ecc3a5dd75d4c56e6323244 Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Tue, 7 Oct 2008 13:46:07 +0000 Subject: dsa: add support for Trailer tagging format This adds support for the Trailer switch tagging format. This is another tagging that doesn't explicitly mark tagged packets with a distinct ethertype, so that we need to add a similar hack in the receive path as for the Original DSA tagging format. Signed-off-by: Lennert Buytenhek Tested-by: Byron Bradley Tested-by: Tim Ellis Signed-off-by: David S. Miller --- include/net/dsa.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/net/dsa.h') diff --git a/include/net/dsa.h b/include/net/dsa.h index 72e509b6a12e..52e97bfca5a1 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -31,6 +31,7 @@ struct dsa_platform_data { }; extern bool dsa_uses_dsa_tags(void *dsa_ptr); +extern bool dsa_uses_trailer_tags(void *dsa_ptr); #endif -- cgit v1.2.3