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     "3.2.3"
  26 #define DRV_RELDATE     "December 6, 2007"
  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 arp_validate;
 130         int use_carrier;
 131         int fail_over_mac;
 132         int updelay;
 133         int downdelay;
 134         int lacp_fast;
 135         char primary[IFNAMSIZ];
 136         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 137 };
 138
 139 struct bond_parm_tbl {
 140         char *modename;
 141         int mode;
 142 };
 143
 144 #define BOND_MAX_MODENAME_LEN 20
 145
 146 struct vlan_entry {
 147         struct list_head vlan_list;
 148         __be32 vlan_ip;
 149         unsigned short vlan_id;
 150 };
 151
 152 struct slave {
 153         struct net_device *dev; /* first - useful for panic debug */
 154         struct slave *next;
 155         struct slave *prev;
 156         int    delay;
 157         unsigned long jiffies;
 158         unsigned long last_arp_rx;
 159         s8     link;    /* one of BOND_LINK_XXXX */
 160         s8     state;   /* one of BOND_STATE_XXXX */
 161         u32    original_flags;
 162         u32    original_mtu;
 163         u32    link_failure_count;
 164         u16    speed;
 165         u8     duplex;
 166         u8     perm_hwaddr[ETH_ALEN];
 167         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 168         struct tlb_slave_info tlb_info;
 169 };
 170
 171 /*
 172  * Here are the locking policies for the two bonding locks:
 173  *
 174  * 1) Get bond->lock when reading/writing slave list.
 175  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 176  *    (It is unnecessary when the write-lock is put with bond->lock.)
 177  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 178  *    beforehand.
 179  */
 180 struct bonding {
 181         struct   net_device *dev; /* first - useful for panic debug */
 182         struct   slave *first_slave;
 183         struct   slave *curr_active_slave;
 184         struct   slave *current_arp_slave;
 185         struct   slave *primary_slave;
 186         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 187         rwlock_t lock;
 188         rwlock_t curr_slave_lock;
 189         s8       kill_timers;
 190         s8       send_grat_arp;
 191         s8       setup_by_slave;
 192         struct   net_device_stats stats;
 193 #ifdef CONFIG_PROC_FS
 194         struct   proc_dir_entry *proc_entry;
 195         char     proc_file_name[IFNAMSIZ];
 196 #endif /* CONFIG_PROC_FS */
 197         struct   list_head bond_list;
 198         struct   dev_mc_list *mc_list;
 199         int      (*xmit_hash_policy)(struct sk_buff *, struct net_device *, int);
 200         __be32   master_ip;
 201         u16      flags;
 202         u16      rr_tx_counter;
 203         struct   ad_bond_info ad_info;
 204         struct   alb_bond_info alb_info;
 205         struct   bond_params params;
 206         struct   list_head vlan_list;
 207         struct   vlan_group *vlgrp;
 208         struct   packet_type arp_mon_pt;
 209         struct   workqueue_struct *wq;
 210         struct   delayed_work mii_work;
 211         struct   delayed_work arp_work;
 212         struct   delayed_work alb_work;
 213         struct   delayed_work ad_work;
 214 };
 215
 216 /**
 217  * Returns NULL if the net_device does not belong to any of the bond's slaves
 218  *
 219  * Caller must hold bond lock for read
 220  */
 221 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev)
 222 {
 223         struct slave *slave = NULL;
 224         int i;
 225
 226         bond_for_each_slave(bond, slave, i) {
 227                 if (slave->dev == slave_dev) {
 228                         break;
 229                 }
 230         }
 231
 232         return slave;
 233 }
 234
 235 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 236 {
 237         if (!slave || !slave->dev->master) {
 238                 return NULL;
 239         }
 240
 241         return (struct bonding *)slave->dev->master->priv;
 242 }
 243
 244 #define BOND_ARP_VALIDATE_NONE          0
 245 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 246 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 247 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 248                                          BOND_ARP_VALIDATE_BACKUP)
 249
 250 static inline int slave_do_arp_validate(struct bonding *bond,
 251                                         struct slave *slave)
 252 {
 253         return bond->params.arp_validate & (1 << slave->state);
 254 }
 255
 256 static inline unsigned long slave_last_rx(struct bonding *bond,
 257                                         struct slave *slave)
 258 {
 259         if (slave_do_arp_validate(bond, slave))
 260                 return slave->last_arp_rx;
 261
 262         return slave->dev->last_rx;
 263 }
 264
 265 static inline void bond_set_slave_inactive_flags(struct slave *slave)
 266 {
 267         struct bonding *bond = slave->dev->master->priv;
 268         if (bond->params.mode != BOND_MODE_TLB &&
 269             bond->params.mode != BOND_MODE_ALB)
 270                 slave->state = BOND_STATE_BACKUP;
 271         slave->dev->priv_flags |= IFF_SLAVE_INACTIVE;
 272         if (slave_do_arp_validate(bond, slave))
 273                 slave->dev->priv_flags |= IFF_SLAVE_NEEDARP;
 274 }
 275
 276 static inline void bond_set_slave_active_flags(struct slave *slave)
 277 {
 278         slave->state = BOND_STATE_ACTIVE;
 279         slave->dev->priv_flags &= ~(IFF_SLAVE_INACTIVE | IFF_SLAVE_NEEDARP);
 280 }
 281
 282 static inline void bond_set_master_3ad_flags(struct bonding *bond)
 283 {
 284         bond->dev->priv_flags |= IFF_MASTER_8023AD;
 285 }
 286
 287 static inline void bond_unset_master_3ad_flags(struct bonding *bond)
 288 {
 289         bond->dev->priv_flags &= ~IFF_MASTER_8023AD;
 290 }
 291
 292 static inline void bond_set_master_alb_flags(struct bonding *bond)
 293 {
 294         bond->dev->priv_flags |= IFF_MASTER_ALB;
 295 }
 296
 297 static inline void bond_unset_master_alb_flags(struct bonding *bond)
 298 {
 299         bond->dev->priv_flags &= ~IFF_MASTER_ALB;
 300 }
 301
 302 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 303 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 304 int bond_create(char *name, struct bond_params *params, struct bonding **newbond);
 305 void bond_destroy(struct bonding *bond);
 306 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev);
 307 int bond_create_sysfs(void);
 308 void bond_destroy_sysfs(void);
 309 void bond_destroy_sysfs_entry(struct bonding *bond);
 310 int bond_create_sysfs_entry(struct bonding *bond);
 311 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 312 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 313 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 314 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 315 void bond_mii_monitor(struct work_struct *);
 316 void bond_loadbalance_arp_mon(struct work_struct *);
 317 void bond_activebackup_arp_mon(struct work_struct *);
 318 void bond_set_mode_ops(struct bonding *bond, int mode);
 319 int bond_parse_parm(const char *mode_arg, struct bond_parm_tbl *tbl);
 320 void bond_select_active_slave(struct bonding *bond);
 321 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 322 void bond_register_arp(struct bonding *);
 323 void bond_unregister_arp(struct bonding *);
 324
 325 #endif /* _LINUX_BONDING_H */
 326