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  * 2003/03/18 - Amir Noam <amir.noam at intel dot com>,
  15  *              Tsippy Mendelson <tsippy.mendelson at intel dot com> and
  16  *              Shmulik Hen <shmulik.hen at intel dot com>
  17  *      - Added support for IEEE 802.3ad Dynamic link aggregation mode.
  18  *
  19  * 2003/05/01 - Tsippy Mendelson <tsippy.mendelson at intel dot com> and
  20  *              Amir Noam <amir.noam at intel dot com>
  21  *      - Code beautification and style changes (mainly in comments).
  22  *
  23  * 2003/05/01 - Shmulik Hen <shmulik.hen at intel dot com>
  24  *      - Added support for Transmit load balancing mode.
  25  *
  26  * 2003/12/01 - Shmulik Hen <shmulik.hen at intel dot com>
  27  *      - Code cleanup and style changes
  28  */
  29
  30 #ifndef _LINUX_BONDING_H
  31 #define _LINUX_BONDING_H
  32
  33 #include <linux/timer.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/if_bonding.h>
  36 #include "bond_3ad.h"
  37 #include "bond_alb.h"
  38
  39 #define DRV_VERSION     "2.6.1"
  40 #define DRV_RELDATE     "October 29, 2004"
  41 #define DRV_NAME        "bonding"
  42 #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
  43
  44 #define BOND_MAX_ARP_TARGETS    16
  45
  46 #ifdef BONDING_DEBUG
  47 #define dprintk(fmt, args...) \
  48         printk(KERN_DEBUG     \
  49                DRV_NAME ": %s() %d: " fmt, __FUNCTION__, __LINE__ , ## args )
  50 #else
  51 #define dprintk(fmt, args...)
  52 #endif /* BONDING_DEBUG */
  53
  54 #define IS_UP(dev)                                         \
  55               ((((dev)->flags & IFF_UP) == IFF_UP)      && \
  56                netif_running(dev)                       && \
  57                netif_carrier_ok(dev))
  58
  59 /*
  60  * Checks whether bond is ready for transmit.
  61  *
  62  * Caller must hold bond->lock
  63  */
  64 #define BOND_IS_OK(bond)                             \
  65                    (((bond)->dev->flags & IFF_UP) && \
  66                     netif_running((bond)->dev)    && \
  67                     ((bond)->slave_cnt > 0))
  68
  69 /*
  70  * Checks whether slave is ready for transmit.
  71  */
  72 #define SLAVE_IS_OK(slave)                              \
  73                     (((slave)->dev->flags & IFF_UP)  && \
  74                      netif_running((slave)->dev)     && \
  75                      ((slave)->link == BOND_LINK_UP) && \
  76                      ((slave)->state == BOND_STATE_ACTIVE))
  77
  78
  79 #define USES_PRIMARY(mode)                              \
  80                 (((mode) == BOND_MODE_ACTIVEBACKUP) ||  \
  81                  ((mode) == BOND_MODE_TLB)          ||  \
  82                  ((mode) == BOND_MODE_ALB))
  83
  84 /*
  85  * Less bad way to call ioctl from within the kernel; this needs to be
  86  * done some other way to get the call out of interrupt context.
  87  * Needs "ioctl" variable to be supplied by calling context.
  88  */
  89 #define IOCTL(dev, arg, cmd) ({         \
  90         int res = 0;                    \
  91         mm_segment_t fs = get_fs();     \
  92         set_fs(get_ds());               \
  93         res = ioctl(dev, arg, cmd);     \
  94         set_fs(fs);                     \
  95         res; })
  96
  97 /**
  98  * bond_for_each_slave_from - iterate the slaves list from a starting point
  99  * @bond:       the bond holding this list.
 100  * @pos:        current slave.
 101  * @cnt:        counter for max number of moves
 102  * @start:      starting point.
 103  *
 104  * Caller must hold bond->lock
 105  */
 106 #define bond_for_each_slave_from(bond, pos, cnt, start) \
 107         for (cnt = 0, pos = start;                              \
 108              cnt < (bond)->slave_cnt;                           \
 109              cnt++, pos = (pos)->next)
 110
 111 /**
 112  * bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
 113  * @bond:       the bond holding this list.
 114  * @pos:        current slave.
 115  * @cnt:        counter for number max of moves
 116  * @start:      start point.
 117  * @stop:       stop point.
 118  *
 119  * Caller must hold bond->lock
 120  */
 121 #define bond_for_each_slave_from_to(bond, pos, cnt, start, stop)        \
 122         for (cnt = 0, pos = start;                                      \
 123              ((cnt < (bond)->slave_cnt) && (pos != (stop)->next));      \
 124              cnt++, pos = (pos)->next)
 125
 126 /**
 127  * bond_for_each_slave - iterate the slaves list from head
 128  * @bond:       the bond holding this list.
 129  * @pos:        current slave.
 130  * @cnt:        counter for max number of moves
 131  *
 132  * Caller must hold bond->lock
 133  */
 134 #define bond_for_each_slave(bond, pos, cnt)     \
 135                 bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
 136
 137
 138 struct bond_params {
 139         int mode;
 140         int miimon;
 141         int arp_interval;
 142         int use_carrier;
 143         int updelay;
 144         int downdelay;
 145         int lacp_fast;
 146         char primary[IFNAMSIZ];
 147         u32 arp_targets[BOND_MAX_ARP_TARGETS];
 148 };
 149
 150 struct vlan_entry {
 151         struct list_head vlan_list;
 152         unsigned short vlan_id;
 153 };
 154
 155 struct slave {
 156         struct net_device *dev; /* first - usefull for panic debug */
 157         struct slave *next;
 158         struct slave *prev;
 159         s16    delay;
 160         u32    jiffies;
 161         s8     link;    /* one of BOND_LINK_XXXX */
 162         s8     state;   /* one of BOND_STATE_XXXX */
 163         u32    original_flags;
 164         u32    link_failure_count;
 165         u16    speed;
 166         u8     duplex;
 167         u8     perm_hwaddr[ETH_ALEN];
 168         struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
 169         struct tlb_slave_info tlb_info;
 170 };
 171
 172 /*
 173  * Here are the locking policies for the two bonding locks:
 174  *
 175  * 1) Get bond->lock when reading/writing slave list.
 176  * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
 177  *    (It is unnecessary when the write-lock is put with bond->lock.)
 178  * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
 179  *    beforehand.
 180  */
 181 struct bonding {
 182         struct   net_device *dev; /* first - usefull for panic debug */
 183         struct   slave *first_slave;
 184         struct   slave *curr_active_slave;
 185         struct   slave *current_arp_slave;
 186         struct   slave *primary_slave;
 187         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 188         rwlock_t lock;
 189         rwlock_t curr_slave_lock;
 190         struct   timer_list mii_timer;
 191         struct   timer_list arp_timer;
 192         s8       kill_timers;
 193         struct   net_device_stats stats;
 194 #ifdef CONFIG_PROC_FS
 195         struct   proc_dir_entry *proc_entry;
 196         char     proc_file_name[IFNAMSIZ];
 197 #endif /* CONFIG_PROC_FS */
 198         struct   list_head bond_list;
 199         struct   dev_mc_list *mc_list;
 200         u16      flags;
 201         struct   ad_bond_info ad_info;
 202         struct   alb_bond_info alb_info;
 203         struct   bond_params params;
 204         struct   list_head vlan_list;
 205         struct   vlan_group *vlgrp;
 206 };
 207
 208 /**
 209  * Returns NULL if the net_device does not belong to any of the bond's slaves
 210  *
 211  * Caller must hold bond lock for read
 212  */
 213 extern inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev)
 214 {
 215         struct slave *slave = NULL;
 216         int i;
 217
 218         bond_for_each_slave(bond, slave, i) {
 219                 if (slave->dev == slave_dev) {
 220                         break;
 221                 }
 222         }
 223
 224         return slave;
 225 }
 226
 227 extern inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 228 {
 229         if (!slave || !slave->dev->master) {
 230                 return NULL;
 231         }
 232
 233         return (struct bonding *)slave->dev->master->priv;
 234 }
 235
 236 extern inline void bond_set_slave_inactive_flags(struct slave *slave)
 237 {
 238         slave->state = BOND_STATE_BACKUP;
 239         slave->dev->flags |= IFF_NOARP;
 240 }
 241
 242 extern inline void bond_set_slave_active_flags(struct slave *slave)
 243 {
 244         slave->state = BOND_STATE_ACTIVE;
 245         slave->dev->flags &= ~IFF_NOARP;
 246 }
 247
 248 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
 249 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 250
 251 #endif /* _LINUX_BONDING_H */
 252