drivers/net/bonding/bonding.h

   1 /*
   2  * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
   3  *
   4  * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
   5  * NCM: Network and Communications Management, Inc.
   6  *
   7  * BUT, I'm the one who modified it for ethernet, so:
   8  * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
   9  *
  10  *      This software may be used and distributed according to the terms
  11  *      of the GNU Public License, incorporated herein by reference.
  12  *
  13  */
  14
  15 #ifndef _LINUX_BONDING_H
  16 #define _LINUX_BONDING_H
  17
  18 #include <linux/timer.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/if_bonding.h>
  21 #include <linux/kobject.h>
  22 #include "bond_3ad.h"
  23 #include "bond_alb.h"
  24
  25 #define DRV_VERSION     "3.0.1"
  26 #define DRV_RELDATE     "January 9, 2006"
  27 #define DRV_NAME        "bonding"
  28 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  29
  30 #define BOND_MAX_ARP_TARGETS    16
  31
  32 #ifdef BONDING_DEBUG
  33 #define dprintk(fmt, args...) \
  34         printk(KERN_DEBUG     \
  35                DRV_NAME ": %s() %d: " fmt, __FUNCTION__, __LINE__ , ## args )
  36 #else
  37 #define dprintk(fmt, args...)
  38 #endif /* BONDING_DEBUG */
  39
  40 #define IS_UP(dev)                                         \
  41               ((((dev)->flags & IFF_UP) == IFF_UP)      && \
  42                netif_running(dev)                       && \
  43                netif_carrier_ok(dev))
  44
  45 /*
  46  * Checks whether bond is ready for transmit.
  47  *
  48  * Caller must hold bond->lock
  49  */
  50 #define BOND_IS_OK(bond)                             \
  51                    (((bond)->dev->flags & IFF_UP) && \
  52                     netif_running((bond)->dev)    && \
  53                     ((bond)->slave_cnt > 0))
  54
  55 /*
  56  * Checks whether slave is ready for transmit.
  57  */
  58 #define SLAVE_IS_OK(slave)                              \
  59                     (((slave)->dev->flags & IFF_UP)  && \
  60                      netif_running((slave)->dev)     && \
  61                      ((slave)->link == BOND_LINK_UP) && \
  62                      ((slave)->state == BOND_STATE_ACTIVE))
  63
  64
  65 #define USES_PRIMARY(mode)                              \
  66                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  67                  ((mode) == BOND_MODE_TLB)          ||  \
  68                  ((mode) == BOND_MODE_ALB))
  69
  70 /*
  71  * Less bad way to call ioctl from within the kernel; this needs to be
  72  * done some other way to get the call out of interrupt context.
  73  * Needs "ioctl" variable to be supplied by calling context.
  74  */
  75 #define IOCTL(dev, arg, cmd) ({         \
  76         int res = 0;                    \
  77         mm_segment_t fs = get_fs();     \
  78         set_fs(get_ds());               \
  79         res = ioctl(dev, arg, cmd);     \
  80         set_fs(fs);                     \
  81         res; })
  82
  83 /**
  84  * bond_for_each_slave_from - iterate the slaves list from a starting point
  85  * @bond:       the bond holding this list.
  86  * @pos:        current slave.
  87  * @cnt:        counter for max number of moves
  88  * @start:      starting point.
  89  *
  90  * Caller must hold bond->lock
  91  */
  92 #define bond_for_each_slave_from(bond, pos, cnt, start) \
  93         for (cnt = 0, pos = start;                              \
  94              cnt < (bond)->slave_cnt;                           \
  95              cnt++, pos = (pos)->next)
  96
  97 /**
  98  * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
  99  * @bond:       the bond holding this list.
 100  * @pos:        current slave.
 101  * @cnt:        counter for number max of moves
 102  * @start:      start point.
 103  * @stop:       stop point.
 104  *
 105  * Caller must hold bond->lock
 106  */
 107 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop)        \
 108         for (cnt = 0, pos = start;                                      \
 109              ((cnt < (bond)->slave_cnt) && (pos != (stop)->next));      \
 110              cnt++, pos = (pos)->next)
 111
 112 /**
 113  * bond_for_each_slave - iterate the slaves list from head
 114  * @bond:       the bond holding this list.
 115  * @pos:        current slave.
 116  * @cnt:        counter for max number of moves
 117  *
 118  * Caller must hold bond->lock
 119  */
 120 #define bond_for_each_slave(bond, pos, cnt)     \
 121                 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
 122
 123
 124 struct bond_params {
 125         int mode;
 126         int xmit_policy;
 127         int miimon;
 128         int arp_interval;
 129         int use_carrier;
 130         int updelay;
 131         int downdelay;
 132         int lacp_fast;
 133         char primary[IFNAMSIZ];
 134         u32 arp_targets[BOND_MAX_ARP_TARGETS];
 135 };
 136
 137 struct bond_parm_tbl {
 138         char *modename;
 139         int mode;
 140 };
 141
 142 struct vlan_entry {
 143         struct list_head vlan_list;
 144         u32 vlan_ip;
 145         unsigned short vlan_id;
 146 };
 147
 148 struct slave {
 149         struct net_device *dev; /* first - useful for panic debug */
 150         struct slave *next;
 151         struct slave *prev;
 152         s16    delay;
 153         u32    jiffies;
 154         s8     link;    /* one of BOND_LINK_XXXX */
 155         s8     state;   /* one of BOND_STATE_XXXX */
 156         u32    original_flags;
 157         u32    link_failure_count;
 158         u16    speed;
 159         u8     duplex;
 160         u8     perm_hwaddr[ETH_ALEN];
 161         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 162         struct tlb_slave_info tlb_info;
 163 };
 164
 165 /*
 166  * Here are the locking policies for the two bonding locks:
 167  *
 168  * 1) Get bond->lock when reading/writing slave list.
 169  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 170  *    (It is unnecessary when the write-lock is put with bond->lock.)
 171  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 172  *    beforehand.
 173  */
 174 struct bonding {
 175         struct   net_device *dev; /* first - useful for panic debug */
 176         struct   slave *first_slave;
 177         struct   slave *curr_active_slave;
 178         struct   slave *current_arp_slave;
 179         struct   slave *primary_slave;
 180         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 181         rwlock_t lock;
 182         rwlock_t curr_slave_lock;
 183         struct   timer_list mii_timer;
 184         struct   timer_list arp_timer;
 185         s8       kill_timers;
 186         struct   net_device_stats stats;
 187 #ifdef CONFIG_PROC_FS
 188         struct   proc_dir_entry *proc_entry;
 189         char     proc_file_name[IFNAMSIZ];
 190 #endif /* CONFIG_PROC_FS */
 191         struct   list_head bond_list;
 192         struct   dev_mc_list *mc_list;
 193         int      (*xmit_hash_policy)(struct sk_buff *, struct net_device *, int);
 194         u32      master_ip;
 195         u16      flags;
 196         struct   ad_bond_info ad_info;
 197         struct   alb_bond_info alb_info;
 198         struct   bond_params params;
 199         struct   list_head vlan_list;
 200         struct   vlan_group *vlgrp;
 201 };
 202
 203 /**
 204  * Returns NULL if the net_device does not belong to any of the bond's slaves
 205  *
 206  * Caller must hold bond lock for read
 207  */
 208 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev)
 209 {
 210         struct slave *slave = NULL;
 211         int i;
 212
 213         bond_for_each_slave(bond, slave, i) {
 214                 if (slave->dev == slave_dev) {
 215                         break;
 216                 }
 217         }
 218
 219         return slave;
 220 }
 221
 222 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 223 {
 224         if (!slave || !slave->dev->master) {
 225                 return NULL;
 226         }
 227
 228         return (struct bonding *)slave->dev->master->priv;
 229 }
 230
 231 static inline void bond_set_slave_inactive_flags(struct slave *slave)
 232 {
 233         slave->state = BOND_STATE_BACKUP;
 234         slave->dev->flags |= IFF_NOARP;
 235 }
 236
 237 static inline void bond_set_slave_active_flags(struct slave *slave)
 238 {
 239         slave->state = BOND_STATE_ACTIVE;
 240         slave->dev->flags &= ~IFF_NOARP;
 241 }
 242
 243 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 244 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 245 int bond_create(char *name, struct bond_params *params, struct bonding **newbond);
 246 void bond_deinit(struct net_device *bond_dev);
 247 int bond_create_sysfs(void);
 248 void bond_destroy_sysfs(void);
 249 void bond_destroy_sysfs_entry(struct bonding *bond);
 250 int bond_create_sysfs_entry(struct bonding *bond);
 251 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 252 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 253 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 254 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 255 int bond_sethwaddr(struct net_device *bond_dev, struct net_device *slave_dev);
 256 void bond_mii_monitor(struct net_device *bond_dev);
 257 void bond_loadbalance_arp_mon(struct net_device *bond_dev);
 258 void bond_activebackup_arp_mon(struct net_device *bond_dev);
 259 void bond_set_mode_ops(struct bonding *bond, int mode);
 260 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl);
 261 const char *bond_mode_name(int mode);
 262 void bond_select_active_slave(struct bonding *bond);
 263 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 264
 265 #endif /* _LINUX_BONDING_H */
 266