linux/include/net/dsa.h
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   1/*
   2 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
   3 * Copyright (c) 2008-2009 Marvell Semiconductor
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 */
  10
  11#ifndef __LINUX_NET_DSA_H
  12#define __LINUX_NET_DSA_H
  13
  14#include <linux/if_ether.h>
  15#include <linux/list.h>
  16#include <linux/timer.h>
  17#include <linux/workqueue.h>
  18
  19#define DSA_MAX_SWITCHES        4
  20#define DSA_MAX_PORTS           12
  21
  22struct dsa_chip_data {
  23        /*
  24         * How to access the switch configuration registers.
  25         */
  26        struct device   *mii_bus;
  27        int             sw_addr;
  28
  29        /*
  30         * The names of the switch's ports.  Use "cpu" to
  31         * designate the switch port that the cpu is connected to,
  32         * "dsa" to indicate that this port is a DSA link to
  33         * another switch, NULL to indicate the port is unused,
  34         * or any other string to indicate this is a physical port.
  35         */
  36        char            *port_names[DSA_MAX_PORTS];
  37
  38        /*
  39         * An array (with nr_chips elements) of which element [a]
  40         * indicates which port on this switch should be used to
  41         * send packets to that are destined for switch a.  Can be
  42         * NULL if there is only one switch chip.
  43         */
  44        s8              *rtable;
  45};
  46
  47struct dsa_platform_data {
  48        /*
  49         * Reference to a Linux network interface that connects
  50         * to the root switch chip of the tree.
  51         */
  52        struct device   *netdev;
  53
  54        /*
  55         * Info structs describing each of the switch chips
  56         * connected via this network interface.
  57         */
  58        int             nr_chips;
  59        struct dsa_chip_data    *chip;
  60};
  61
  62struct dsa_switch_tree {
  63        /*
  64         * Configuration data for the platform device that owns
  65         * this dsa switch tree instance.
  66         */
  67        struct dsa_platform_data        *pd;
  68
  69        /*
  70         * Reference to network device to use, and which tagging
  71         * protocol to use.
  72         */
  73        struct net_device       *master_netdev;
  74        __be16                  tag_protocol;
  75
  76        /*
  77         * The switch and port to which the CPU is attached.
  78         */
  79        s8                      cpu_switch;
  80        s8                      cpu_port;
  81
  82        /*
  83         * Link state polling.
  84         */
  85        int                     link_poll_needed;
  86        struct work_struct      link_poll_work;
  87        struct timer_list       link_poll_timer;
  88
  89        /*
  90         * Data for the individual switch chips.
  91         */
  92        struct dsa_switch       *ds[DSA_MAX_SWITCHES];
  93};
  94
  95struct dsa_switch {
  96        /*
  97         * Parent switch tree, and switch index.
  98         */
  99        struct dsa_switch_tree  *dst;
 100        int                     index;
 101
 102        /*
 103         * Configuration data for this switch.
 104         */
 105        struct dsa_chip_data    *pd;
 106
 107        /*
 108         * The used switch driver.
 109         */
 110        struct dsa_switch_driver        *drv;
 111
 112        /*
 113         * Reference to mii bus to use.
 114         */
 115        struct mii_bus          *master_mii_bus;
 116
 117        /*
 118         * Slave mii_bus and devices for the individual ports.
 119         */
 120        u32                     dsa_port_mask;
 121        u32                     phys_port_mask;
 122        struct mii_bus          *slave_mii_bus;
 123        struct net_device       *ports[DSA_MAX_PORTS];
 124};
 125
 126static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 127{
 128        return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
 129}
 130
 131static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 132{
 133        struct dsa_switch_tree *dst = ds->dst;
 134
 135        /*
 136         * If this is the root switch (i.e. the switch that connects
 137         * to the CPU), return the cpu port number on this switch.
 138         * Else return the (DSA) port number that connects to the
 139         * switch that is one hop closer to the cpu.
 140         */
 141        if (dst->cpu_switch == ds->index)
 142                return dst->cpu_port;
 143        else
 144                return ds->pd->rtable[dst->cpu_switch];
 145}
 146
 147struct dsa_switch_driver {
 148        struct list_head        list;
 149
 150        __be16                  tag_protocol;
 151        int                     priv_size;
 152
 153        /*
 154         * Probing and setup.
 155         */
 156        char    *(*probe)(struct mii_bus *bus, int sw_addr);
 157        int     (*setup)(struct dsa_switch *ds);
 158        int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
 159
 160        /*
 161         * Access to the switch's PHY registers.
 162         */
 163        int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 164        int     (*phy_write)(struct dsa_switch *ds, int port,
 165                             int regnum, u16 val);
 166
 167        /*
 168         * Link state polling and IRQ handling.
 169         */
 170        void    (*poll_link)(struct dsa_switch *ds);
 171
 172        /*
 173         * ethtool hardware statistics.
 174         */
 175        void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
 176        void    (*get_ethtool_stats)(struct dsa_switch *ds,
 177                                     int port, uint64_t *data);
 178        int     (*get_sset_count)(struct dsa_switch *ds);
 179};
 180
 181void register_switch_driver(struct dsa_switch_driver *type);
 182void unregister_switch_driver(struct dsa_switch_driver *type);
 183
 184/*
 185 * The original DSA tag format and some other tag formats have no
 186 * ethertype, which means that we need to add a little hack to the
 187 * networking receive path to make sure that received frames get
 188 * the right ->protocol assigned to them when one of those tag
 189 * formats is in use.
 190 */
 191static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst)
 192{
 193        return !!(dst->tag_protocol == htons(ETH_P_DSA));
 194}
 195
 196static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst)
 197{
 198        return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
 199}
 200
 201#endif
 202
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