net: Distributed Switch Architecture protocol support (91da11f8) · Commits · 戴 / test

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 <buytenh@marvell.com> Tested-by:

Nicolas Pitre <nico@marvell.com> Tested-by:

Byron Bradley <byron.bbradley@gmail.com> Tested-by:

Tim Ellis <tim.ellis@mac.com> Tested-by:

Peter van Valderen <linux@ddcrew.com> Tested-by:

Dirk Teurlings <dirk@upexia.nl> Signed-off-by:

David S. Miller <davem@davemloft.net>

include/linux/if_ether.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -77,6 +77,7 @@
		#define ETH_P_PAE 0x888E /* Port Access Entity (IEEE 802.1X) */
		#define ETH_P_AOE 0x88A2 /* ATA over Ethernet */
		#define ETH_P_TIPC 0x88CA /* TIPC */
		#define ETH_P_EDSA 0xDADA /* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */

		/*
		* Non DIX types. Won't clash for 1500 types.

include/linux/netdevice.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -607,6 +607,9 @@ struct net_device

		/* Protocol specific pointers */

		#ifdef CONFIG_NET_DSA
		void dsa_ptr; / dsa specific data */
		#endif
		void atalk_ptr; / AppleTalk link */
		void ip_ptr; / IPv4 specific data */
		void dn_ptr; / DECnet specific data */

include/net/dsa.h

0 → 100644

+34 −0

Original line number	Diff line number	Diff line
		/*
		* 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

net/Kconfig

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Original line number	Diff line number	Diff line
		@@ -180,6 +180,7 @@ source "net/tipc/Kconfig"
		source "net/atm/Kconfig"
		source "net/802/Kconfig"
		source "net/bridge/Kconfig"
		source "net/dsa/Kconfig"
		source "net/8021q/Kconfig"
		source "net/decnet/Kconfig"
		source "net/llc/Kconfig"

net/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ obj-$(CONFIG_PACKET) += packet/
		obj-$(CONFIG_NET_KEY) += key/
		obj-$(CONFIG_NET_SCHED) += sched/
		obj-$(CONFIG_BRIDGE) += bridge/
		obj-$(CONFIG_NET_DSA) += dsa/
		obj-$(CONFIG_IPX) += ipx/
		obj-$(CONFIG_ATALK) += appletalk/
		obj-$(CONFIG_WAN_ROUTER) += wanrouter/

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