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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 #include <linux/of.h>
 19 #include <linux/phy.h>
 20 #include <linux/phy_fixed.h>
 21 #include <linux/ethtool.h>
 22 
 23 enum dsa_tag_protocol {
 24         DSA_TAG_PROTO_NONE = 0,
 25         DSA_TAG_PROTO_DSA,
 26         DSA_TAG_PROTO_TRAILER,
 27         DSA_TAG_PROTO_EDSA,
 28         DSA_TAG_PROTO_BRCM,
 29 };
 30 
 31 #define DSA_MAX_SWITCHES        4
 32 #define DSA_MAX_PORTS           12
 33 
 34 struct dsa_chip_data {
 35         /*
 36          * How to access the switch configuration registers.
 37          */
 38         struct device   *host_dev;
 39         int             sw_addr;
 40 
 41         /* set to size of eeprom if supported by the switch */
 42         int             eeprom_len;
 43 
 44         /* Device tree node pointer for this specific switch chip
 45          * used during switch setup in case additional properties
 46          * and resources needs to be used
 47          */
 48         struct device_node *of_node;
 49 
 50         /*
 51          * The names of the switch's ports.  Use "cpu" to
 52          * designate the switch port that the cpu is connected to,
 53          * "dsa" to indicate that this port is a DSA link to
 54          * another switch, NULL to indicate the port is unused,
 55          * or any other string to indicate this is a physical port.
 56          */
 57         char            *port_names[DSA_MAX_PORTS];
 58         struct device_node *port_dn[DSA_MAX_PORTS];
 59 
 60         /*
 61          * An array (with nr_chips elements) of which element [a]
 62          * indicates which port on this switch should be used to
 63          * send packets to that are destined for switch a.  Can be
 64          * NULL if there is only one switch chip.
 65          */
 66         s8              *rtable;
 67 };
 68 
 69 struct dsa_platform_data {
 70         /*
 71          * Reference to a Linux network interface that connects
 72          * to the root switch chip of the tree.
 73          */
 74         struct device   *netdev;
 75         struct net_device *of_netdev;
 76 
 77         /*
 78          * Info structs describing each of the switch chips
 79          * connected via this network interface.
 80          */
 81         int             nr_chips;
 82         struct dsa_chip_data    *chip;
 83 };
 84 
 85 struct packet_type;
 86 
 87 struct dsa_switch_tree {
 88         /*
 89          * Configuration data for the platform device that owns
 90          * this dsa switch tree instance.
 91          */
 92         struct dsa_platform_data        *pd;
 93 
 94         /*
 95          * Reference to network device to use, and which tagging
 96          * protocol to use.
 97          */
 98         struct net_device       *master_netdev;
 99         int                     (*rcv)(struct sk_buff *skb,
100                                        struct net_device *dev,
101                                        struct packet_type *pt,
102                                        struct net_device *orig_dev);
103         enum dsa_tag_protocol   tag_protocol;
104 
105         /*
106          * The switch and port to which the CPU is attached.
107          */
108         s8                      cpu_switch;
109         s8                      cpu_port;
110 
111         /*
112          * Link state polling.
113          */
114         int                     link_poll_needed;
115         struct work_struct      link_poll_work;
116         struct timer_list       link_poll_timer;
117 
118         /*
119          * Data for the individual switch chips.
120          */
121         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
122 };
123 
124 struct dsa_switch {
125         /*
126          * Parent switch tree, and switch index.
127          */
128         struct dsa_switch_tree  *dst;
129         int                     index;
130 
131         /*
132          * Tagging protocol understood by this switch
133          */
134         enum dsa_tag_protocol   tag_protocol;
135 
136         /*
137          * Configuration data for this switch.
138          */
139         struct dsa_chip_data    *pd;
140 
141         /*
142          * The used switch driver.
143          */
144         struct dsa_switch_driver        *drv;
145 
146         /*
147          * Reference to host device to use.
148          */
149         struct device           *master_dev;
150 
151 #ifdef CONFIG_NET_DSA_HWMON
152         /*
153          * Hardware monitoring information
154          */
155         char                    hwmon_name[IFNAMSIZ + 8];
156         struct device           *hwmon_dev;
157 #endif
158 
159         /*
160          * Slave mii_bus and devices for the individual ports.
161          */
162         u32                     dsa_port_mask;
163         u32                     phys_port_mask;
164         u32                     phys_mii_mask;
165         struct mii_bus          *slave_mii_bus;
166         struct net_device       *ports[DSA_MAX_PORTS];
167 };
168 
169 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
170 {
171         return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
172 }
173 
174 static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
175 {
176         return ds->phys_port_mask & (1 << p) && ds->ports[p];
177 }
178 
179 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
180 {
181         struct dsa_switch_tree *dst = ds->dst;
182 
183         /*
184          * If this is the root switch (i.e. the switch that connects
185          * to the CPU), return the cpu port number on this switch.
186          * Else return the (DSA) port number that connects to the
187          * switch that is one hop closer to the cpu.
188          */
189         if (dst->cpu_switch == ds->index)
190                 return dst->cpu_port;
191         else
192                 return ds->pd->rtable[dst->cpu_switch];
193 }
194 
195 struct dsa_switch_driver {
196         struct list_head        list;
197 
198         enum dsa_tag_protocol   tag_protocol;
199         int                     priv_size;
200 
201         /*
202          * Probing and setup.
203          */
204         char    *(*probe)(struct device *host_dev, int sw_addr);
205         int     (*setup)(struct dsa_switch *ds);
206         int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
207         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
208 
209         /*
210          * Access to the switch's PHY registers.
211          */
212         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
213         int     (*phy_write)(struct dsa_switch *ds, int port,
214                              int regnum, u16 val);
215 
216         /*
217          * Link state polling and IRQ handling.
218          */
219         void    (*poll_link)(struct dsa_switch *ds);
220 
221         /*
222          * Link state adjustment (called from libphy)
223          */
224         void    (*adjust_link)(struct dsa_switch *ds, int port,
225                                 struct phy_device *phydev);
226         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
227                                 struct fixed_phy_status *st);
228 
229         /*
230          * ethtool hardware statistics.
231          */
232         void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
233         void    (*get_ethtool_stats)(struct dsa_switch *ds,
234                                      int port, uint64_t *data);
235         int     (*get_sset_count)(struct dsa_switch *ds);
236 
237         /*
238          * ethtool Wake-on-LAN
239          */
240         void    (*get_wol)(struct dsa_switch *ds, int port,
241                            struct ethtool_wolinfo *w);
242         int     (*set_wol)(struct dsa_switch *ds, int port,
243                            struct ethtool_wolinfo *w);
244 
245         /*
246          * Suspend and resume
247          */
248         int     (*suspend)(struct dsa_switch *ds);
249         int     (*resume)(struct dsa_switch *ds);
250 
251         /*
252          * Port enable/disable
253          */
254         int     (*port_enable)(struct dsa_switch *ds, int port,
255                                struct phy_device *phy);
256         void    (*port_disable)(struct dsa_switch *ds, int port,
257                                 struct phy_device *phy);
258 
259         /*
260          * EEE setttings
261          */
262         int     (*set_eee)(struct dsa_switch *ds, int port,
263                            struct phy_device *phydev,
264                            struct ethtool_eee *e);
265         int     (*get_eee)(struct dsa_switch *ds, int port,
266                            struct ethtool_eee *e);
267 
268 #ifdef CONFIG_NET_DSA_HWMON
269         /* Hardware monitoring */
270         int     (*get_temp)(struct dsa_switch *ds, int *temp);
271         int     (*get_temp_limit)(struct dsa_switch *ds, int *temp);
272         int     (*set_temp_limit)(struct dsa_switch *ds, int temp);
273         int     (*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
274 #endif
275 
276         /* EEPROM access */
277         int     (*get_eeprom_len)(struct dsa_switch *ds);
278         int     (*get_eeprom)(struct dsa_switch *ds,
279                               struct ethtool_eeprom *eeprom, u8 *data);
280         int     (*set_eeprom)(struct dsa_switch *ds,
281                               struct ethtool_eeprom *eeprom, u8 *data);
282 
283         /*
284          * Register access.
285          */
286         int     (*get_regs_len)(struct dsa_switch *ds, int port);
287         void    (*get_regs)(struct dsa_switch *ds, int port,
288                             struct ethtool_regs *regs, void *p);
289 
290         /*
291          * Bridge integration
292          */
293         int     (*port_join_bridge)(struct dsa_switch *ds, int port,
294                                     u32 br_port_mask);
295         int     (*port_leave_bridge)(struct dsa_switch *ds, int port,
296                                      u32 br_port_mask);
297         int     (*port_stp_update)(struct dsa_switch *ds, int port,
298                                    u8 state);
299         int     (*fdb_add)(struct dsa_switch *ds, int port,
300                            const unsigned char *addr, u16 vid);
301         int     (*fdb_del)(struct dsa_switch *ds, int port,
302                            const unsigned char *addr, u16 vid);
303         int     (*fdb_getnext)(struct dsa_switch *ds, int port,
304                                unsigned char *addr, bool *is_static);
305 };
306 
307 void register_switch_driver(struct dsa_switch_driver *type);
308 void unregister_switch_driver(struct dsa_switch_driver *type);
309 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
310 
311 static inline void *ds_to_priv(struct dsa_switch *ds)
312 {
313         return (void *)(ds + 1);
314 }
315 
316 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
317 {
318         return dst->rcv != NULL;
319 }
320 #endif
321 

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