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 <linux/in6.h>
  23 #include "bond_3ad.h"
  24 #include "bond_alb.h"
  25
  26 #define DRV_VERSION     "3.6.0"
  27 #define DRV_RELDATE     "September 26, 2009"
  28 #define DRV_NAME        "bonding"
  29 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  30
  31 #define BOND_MAX_ARP_TARGETS    16
  32
  33 #define IS_UP(dev)                                         \
  34               ((((dev)->flags & IFF_UP) == IFF_UP)      && \
  35                netif_running(dev)                       && \
  36                netif_carrier_ok(dev))
  37
  38 /*
  39  * Checks whether bond is ready for transmit.
  40  *
  41  * Caller must hold bond->lock
  42  */
  43 #define BOND_IS_OK(bond)                             \
  44                    (((bond)->dev->flags & IFF_UP) && \
  45                     netif_running((bond)->dev)    && \
  46                     ((bond)->slave_cnt > 0))
  47
  48 /*
  49  * Checks whether slave is ready for transmit.
  50  */
  51 #define SLAVE_IS_OK(slave)                              \
  52                     (((slave)->dev->flags & IFF_UP)  && \
  53                      netif_running((slave)->dev)     && \
  54                      ((slave)->link == BOND_LINK_UP) && \
  55                      ((slave)->state == BOND_STATE_ACTIVE))
  56
  57
  58 #define USES_PRIMARY(mode)                              \
  59                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  60                  ((mode) == BOND_MODE_TLB)          ||  \
  61                  ((mode) == BOND_MODE_ALB))
  62
  63 /*
  64  * Less bad way to call ioctl from within the kernel; this needs to be
  65  * done some other way to get the call out of interrupt context.
  66  * Needs "ioctl" variable to be supplied by calling context.
  67  */
  68 #define IOCTL(dev, arg, cmd) ({         \
  69         int res = 0;                    \
  70         mm_segment_t fs = get_fs();     \
  71         set_fs(get_ds());               \
  72         res = ioctl(dev, arg, cmd);     \
  73         set_fs(fs);                     \
  74         res; })
  75
  76 /**
  77  * bond_for_each_slave_from - iterate the slaves list from a starting point
  78  * @bond:       the bond holding this list.
  79  * @pos:        current slave.
  80  * @cnt:        counter for max number of moves
  81  * @start:      starting point.
  82  *
  83  * Caller must hold bond->lock
  84  */
  85 #define bond_for_each_slave_from(bond, pos, cnt, start) \
  86         for (cnt = 0, pos = start;                              \
  87              cnt < (bond)->slave_cnt;                           \
  88              cnt++, pos = (pos)->next)
  89
  90 /**
  91  * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
  92  * @bond:       the bond holding this list.
  93  * @pos:        current slave.
  94  * @cnt:        counter for number max of moves
  95  * @start:      start point.
  96  * @stop:       stop point.
  97  *
  98  * Caller must hold bond->lock
  99  */
 100 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop)        \
 101         for (cnt = 0, pos = start;                                      \
 102              ((cnt < (bond)->slave_cnt) && (pos != (stop)->next));      \
 103              cnt++, pos = (pos)->next)
 104
 105 /**
 106  * bond_for_each_slave - iterate the slaves list from head
 107  * @bond:       the bond holding this list.
 108  * @pos:        current slave.
 109  * @cnt:        counter for max number of moves
 110  *
 111  * Caller must hold bond->lock
 112  */
 113 #define bond_for_each_slave(bond, pos, cnt)     \
 114                 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
 115
 116
 117 struct bond_params {
 118         int mode;
 119         int xmit_policy;
 120         int miimon;
 121         int num_grat_arp;
 122         int num_unsol_na;
 123         int arp_interval;
 124         int arp_validate;
 125         int use_carrier;
 126         int fail_over_mac;
 127         int updelay;
 128         int downdelay;
 129         int lacp_fast;
 130         int ad_select;
 131         char primary[IFNAMSIZ];
 132         int primary_reselect;
 133         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 134 };
 135
 136 struct bond_parm_tbl {
 137         char *modename;
 138         int mode;
 139 };
 140
 141 #define BOND_MAX_MODENAME_LEN 20
 142
 143 struct vlan_entry {
 144         struct list_head vlan_list;
 145         __be32 vlan_ip;
 146         unsigned short vlan_id;
 147 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 148         struct in6_addr vlan_ipv6;
 149 #endif
 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     new_link;
 161         s8     state;   /* one of BOND_STATE_XXXX */
 162         u32    original_flags;
 163         u32    original_mtu;
 164         u32    link_failure_count;
 165         u8     perm_hwaddr[ETH_ALEN];
 166         u16    speed;
 167         u8     duplex;
 168         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 169         struct tlb_slave_info tlb_info;
 170 };
 171
 172 /*
 173  * Link pseudo-state only used internally by monitors
 174  */
 175 #define BOND_LINK_NOCHANGE -1
 176
 177 /*
 178  * Here are the locking policies for the two bonding locks:
 179  *
 180  * 1) Get bond->lock when reading/writing slave list.
 181  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 182  *    (It is unnecessary when the write-lock is put with bond->lock.)
 183  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 184  *    beforehand.
 185  */
 186 struct bonding {
 187         struct   net_device *dev; /* first - useful for panic debug */
 188         struct   slave *first_slave;
 189         struct   slave *curr_active_slave;
 190         struct   slave *current_arp_slave;
 191         struct   slave *primary_slave;
 192         bool     force_primary;
 193         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 194         rwlock_t lock;
 195         rwlock_t curr_slave_lock;
 196         s8       kill_timers;
 197         s8       send_grat_arp;
 198         s8       send_unsol_na;
 199         s8       setup_by_slave;
 200         struct   net_device_stats stats;
 201 #ifdef CONFIG_PROC_FS
 202         struct   proc_dir_entry *proc_entry;
 203         char     proc_file_name[IFNAMSIZ];
 204 #endif /* CONFIG_PROC_FS */
 205         struct   list_head bond_list;
 206         struct   dev_mc_list *mc_list;
 207         int      (*xmit_hash_policy)(struct sk_buff *, int);
 208         __be32   master_ip;
 209         u16      flags;
 210         u16      rr_tx_counter;
 211         struct   ad_bond_info ad_info;
 212         struct   alb_bond_info alb_info;
 213         struct   bond_params params;
 214         struct   list_head vlan_list;
 215         struct   vlan_group *vlgrp;
 216         struct   packet_type arp_mon_pt;
 217         struct   workqueue_struct *wq;
 218         struct   delayed_work mii_work;
 219         struct   delayed_work arp_work;
 220         struct   delayed_work alb_work;
 221         struct   delayed_work ad_work;
 222 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 223         struct   in6_addr master_ipv6;
 224 #endif
 225 };
 226
 227 /**
 228  * Returns NULL if the net_device does not belong to any of the bond's slaves
 229  *
 230  * Caller must hold bond lock for read
 231  */
 232 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev)
 233 {
 234         struct slave *slave = NULL;
 235         int i;
 236
 237         bond_for_each_slave(bond, slave, i) {
 238                 if (slave->dev == slave_dev) {
 239                         break;
 240                 }
 241         }
 242
 243         return slave;
 244 }
 245
 246 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 247 {
 248         if (!slave || !slave->dev->master) {
 249                 return NULL;
 250         }
 251
 252         return (struct bonding *)netdev_priv(slave->dev->master);
 253 }
 254
 255 static inline bool bond_is_lb(const struct bonding *bond)
 256 {
 257         return bond->params.mode == BOND_MODE_TLB
 258                 || bond->params.mode == BOND_MODE_ALB;
 259 }
 260
 261 #define BOND_PRI_RESELECT_ALWAYS        0
 262 #define BOND_PRI_RESELECT_BETTER        1
 263 #define BOND_PRI_RESELECT_FAILURE       2
 264
 265 #define BOND_FOM_NONE                   0
 266 #define BOND_FOM_ACTIVE                 1
 267 #define BOND_FOM_FOLLOW                 2
 268
 269 #define BOND_ARP_VALIDATE_NONE          0
 270 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 271 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 272 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 273                                          BOND_ARP_VALIDATE_BACKUP)
 274
 275 static inline int slave_do_arp_validate(struct bonding *bond,
 276                                         struct slave *slave)
 277 {
 278         return bond->params.arp_validate & (1 << slave->state);
 279 }
 280
 281 static inline unsigned long slave_last_rx(struct bonding *bond,
 282                                         struct slave *slave)
 283 {
 284         if (slave_do_arp_validate(bond, slave))
 285                 return slave->last_arp_rx;
 286
 287         return slave->dev->last_rx;
 288 }
 289
 290 static inline void bond_set_slave_inactive_flags(struct slave *slave)
 291 {
 292         struct bonding *bond = netdev_priv(slave->dev->master);
 293         if (!bond_is_lb(bond))
 294                 slave->state = BOND_STATE_BACKUP;
 295         slave->dev->priv_flags |= IFF_SLAVE_INACTIVE;
 296         if (slave_do_arp_validate(bond, slave))
 297                 slave->dev->priv_flags |= IFF_SLAVE_NEEDARP;
 298 }
 299
 300 static inline void bond_set_slave_active_flags(struct slave *slave)
 301 {
 302         slave->state = BOND_STATE_ACTIVE;
 303         slave->dev->priv_flags &= ~(IFF_SLAVE_INACTIVE | IFF_SLAVE_NEEDARP);
 304 }
 305
 306 static inline void bond_set_master_3ad_flags(struct bonding *bond)
 307 {
 308         bond->dev->priv_flags |= IFF_MASTER_8023AD;
 309 }
 310
 311 static inline void bond_unset_master_3ad_flags(struct bonding *bond)
 312 {
 313         bond->dev->priv_flags &= ~IFF_MASTER_8023AD;
 314 }
 315
 316 static inline void bond_set_master_alb_flags(struct bonding *bond)
 317 {
 318         bond->dev->priv_flags |= IFF_MASTER_ALB;
 319 }
 320
 321 static inline void bond_unset_master_alb_flags(struct bonding *bond)
 322 {
 323         bond->dev->priv_flags &= ~IFF_MASTER_ALB;
 324 }
 325
 326 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 327 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 328 int bond_create(struct net *net, const char *name);
 329 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev);
 330 int bond_create_sysfs(void);
 331 void bond_destroy_sysfs(void);
 332 void bond_prepare_sysfs_group(struct bonding *bond);
 333 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 334 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 335 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 336 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 337 void bond_mii_monitor(struct work_struct *);
 338 void bond_loadbalance_arp_mon(struct work_struct *);
 339 void bond_activebackup_arp_mon(struct work_struct *);
 340 void bond_set_mode_ops(struct bonding *bond, int mode);
 341 int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
 342 void bond_select_active_slave(struct bonding *bond);
 343 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 344 void bond_register_arp(struct bonding *);
 345 void bond_unregister_arp(struct bonding *);
 346
 347 struct bond_net {
 348         struct net *            net;    /* Associated network namespace */
 349         struct list_head        dev_list;
 350 #ifdef CONFIG_PROC_FS
 351         struct proc_dir_entry * proc_dir;
 352 #endif
 353 };
 354
 355 /* exported from bond_main.c */
 356 extern int bond_net_id;
 357 extern const struct bond_parm_tbl bond_lacp_tbl[];
 358 extern const struct bond_parm_tbl bond_mode_tbl[];
 359 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 360 extern const struct bond_parm_tbl arp_validate_tbl[];
 361 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 362 extern const struct bond_parm_tbl pri_reselect_tbl[];
 363 extern struct bond_parm_tbl ad_select_tbl[];
 364
 365 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 366 void bond_send_unsolicited_na(struct bonding *bond);
 367 void bond_register_ipv6_notifier(void);
 368 void bond_unregister_ipv6_notifier(void);
 369 #else
 370 static inline void bond_send_unsolicited_na(struct bonding *bond)
 371 {
 372         return;
 373 }
 374 static inline void bond_register_ipv6_notifier(void)
 375 {
 376         return;
 377 }
 378 static inline void bond_unregister_ipv6_notifier(void)
 379 {
 380         return;
 381 }
 382 #endif
 383
 384 #endif /* _LINUX_BONDING_H */