/* * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'. * * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes * NCM: Network and Communications Management, Inc. * * BUT, I'm the one who modified it for ethernet, so: * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov * * This software may be used and distributed according to the terms * of the GNU Public License, incorporated herein by reference. * */ #ifndef _LINUX_BONDING_H #define _LINUX_BONDING_H #include #include #include #include #include #include #include #include #include "bond_3ad.h" #include "bond_alb.h" #define DRV_VERSION "3.7.1" #define DRV_RELDATE "April 27, 2011" #define DRV_NAME "bonding" #define DRV_DESCRIPTION "Ethernet Channel Bonding Driver" #define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n" #define BOND_MAX_ARP_TARGETS 16 #define IS_UP(dev) \ ((((dev)->flags & IFF_UP) == IFF_UP) && \ netif_running(dev) && \ netif_carrier_ok(dev)) /* * Checks whether slave is ready for transmit. */ #define SLAVE_IS_OK(slave) \ (((slave)->dev->flags & IFF_UP) && \ netif_running((slave)->dev) && \ ((slave)->link == BOND_LINK_UP) && \ bond_is_active_slave(slave)) #define USES_PRIMARY(mode) \ (((mode) == BOND_MODE_ACTIVEBACKUP) || \ ((mode) == BOND_MODE_TLB) || \ ((mode) == BOND_MODE_ALB)) #define TX_QUEUE_OVERRIDE(mode) \ (((mode) == BOND_MODE_ACTIVEBACKUP) || \ ((mode) == BOND_MODE_ROUNDROBIN)) /* * Less bad way to call ioctl from within the kernel; this needs to be * done some other way to get the call out of interrupt context. * Needs "ioctl" variable to be supplied by calling context. */ #define IOCTL(dev, arg, cmd) ({ \ int res = 0; \ mm_segment_t fs = get_fs(); \ set_fs(get_ds()); \ res = ioctl(dev, arg, cmd); \ set_fs(fs); \ res; }) /* slave list primitives */ #define bond_to_slave(ptr) list_entry(ptr, struct slave, list) /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */ #define bond_first_slave(bond) \ list_first_entry_or_null(&(bond)->slave_list, struct slave, list) #define bond_last_slave(bond) \ (list_empty(&(bond)->slave_list) ? NULL : \ bond_to_slave((bond)->slave_list.prev)) #define bond_is_first_slave(bond, pos) ((pos)->list.prev == &(bond)->slave_list) #define bond_is_last_slave(bond, pos) ((pos)->list.next == &(bond)->slave_list) /* Since bond_first/last_slave can return NULL, these can return NULL too */ #define bond_next_slave(bond, pos) \ (bond_is_last_slave(bond, pos) ? bond_first_slave(bond) : \ bond_to_slave((pos)->list.next)) #define bond_prev_slave(bond, pos) \ (bond_is_first_slave(bond, pos) ? bond_last_slave(bond) : \ bond_to_slave((pos)->list.prev)) /** * bond_for_each_slave_from - iterate the slaves list from a starting point * @bond: the bond holding this list. * @pos: current slave. * @cnt: counter for max number of moves * @start: starting point. * * Caller must hold bond->lock */ #define bond_for_each_slave_from(bond, pos, cnt, start) \ for (cnt = 0, pos = start; pos && cnt < (bond)->slave_cnt; \ cnt++, pos = bond_next_slave(bond, pos)) /** * bond_for_each_slave - iterate over all slaves * @bond: the bond holding this list * @pos: current slave * * Caller must hold bond->lock */ #define bond_for_each_slave(bond, pos) \ list_for_each_entry(pos, &(bond)->slave_list, list) /* Caller must have rcu_read_lock */ #define bond_for_each_slave_rcu(bond, pos) \ list_for_each_entry_rcu(pos, &(bond)->slave_list, list) /** * bond_for_each_slave_reverse - iterate in reverse from a given position * @bond: the bond holding this list * @pos: slave to continue from * * Caller must hold bond->lock */ #define bond_for_each_slave_continue_reverse(bond, pos) \ list_for_each_entry_continue_reverse(pos, &(bond)->slave_list, list) #ifdef CONFIG_NET_POLL_CONTROLLER extern atomic_t netpoll_block_tx; static inline void block_netpoll_tx(void) { atomic_inc(&netpoll_block_tx); } static inline void unblock_netpoll_tx(void) { atomic_dec(&netpoll_block_tx); } static inline int is_netpoll_tx_blocked(struct net_device *dev) { if (unlikely(netpoll_tx_running(dev))) return atomic_read(&netpoll_block_tx); return 0; } #else #define block_netpoll_tx() #define unblock_netpoll_tx() #define is_netpoll_tx_blocked(dev) (0) #endif struct bond_params { int mode; int xmit_policy; int miimon; u8 num_peer_notif; int arp_interval; int arp_validate; int arp_all_targets; int use_carrier; int fail_over_mac; int updelay; int downdelay; int lacp_fast; unsigned int min_links; int ad_select; char primary[IFNAMSIZ]; int primary_reselect; __be32 arp_targets[BOND_MAX_ARP_TARGETS]; int tx_queues; int all_slaves_active; int resend_igmp; int lp_interval; }; struct bond_parm_tbl { char *modename; int mode; }; #define BOND_MAX_MODENAME_LEN 20 struct slave { struct net_device *dev; /* first - useful for panic debug */ struct list_head list; struct bonding *bond; /* our master */ int delay; unsigned long jiffies; unsigned long last_arp_rx; unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS]; s8 link; /* one of BOND_LINK_XXXX */ s8 new_link; u8 backup:1, /* indicates backup slave. Value corresponds with BOND_STATE_ACTIVE and BOND_STATE_BACKUP */ inactive:1; /* indicates inactive slave */ u8 duplex; u32 original_mtu; u32 link_failure_count; u32 speed; u16 queue_id; u8 perm_hwaddr[ETH_ALEN]; struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */ struct tlb_slave_info tlb_info; #ifdef CONFIG_NET_POLL_CONTROLLER struct netpoll *np; #endif }; /* * Link pseudo-state only used internally by monitors */ #define BOND_LINK_NOCHANGE -1 /* * Here are the locking policies for the two bonding locks: * * 1) Get bond->lock when reading/writing slave list. * 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave. * (It is unnecessary when the write-lock is put with bond->lock.) * 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock * beforehand. */ struct bonding { struct net_device *dev; /* first - useful for panic debug */ struct list_head slave_list; struct slave *curr_active_slave; struct slave *current_arp_slave; struct slave *primary_slave; bool force_primary; s32 slave_cnt; /* never change this value outside the attach/detach wrappers */ int (*recv_probe)(const struct sk_buff *, struct bonding *, struct slave *); rwlock_t lock; rwlock_t curr_slave_lock; u8 send_peer_notif; u8 igmp_retrans; #ifdef CONFIG_PROC_FS struct proc_dir_entry *proc_entry; char proc_file_name[IFNAMSIZ]; #endif /* CONFIG_PROC_FS */ struct list_head bond_list; int (*xmit_hash_policy)(struct sk_buff *, int); u16 rr_tx_counter; struct ad_bond_info ad_info; struct alb_bond_info alb_info; struct bond_params params; struct workqueue_struct *wq; struct delayed_work mii_work; struct delayed_work arp_work; struct delayed_work alb_work; struct delayed_work ad_work; struct delayed_work mcast_work; #ifdef CONFIG_DEBUG_FS /* debugging support via debugfs */ struct dentry *debug_dir; #endif /* CONFIG_DEBUG_FS */ }; #define bond_slave_get_rcu(dev) \ ((struct slave *) rcu_dereference(dev->rx_handler_data)) #define bond_slave_get_rtnl(dev) \ ((struct slave *) rtnl_dereference(dev->rx_handler_data)) /** * Returns NULL if the net_device does not belong to any of the bond's slaves * * Caller must hold bond lock for read */ static inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev) { struct slave *slave = NULL; bond_for_each_slave(bond, slave) if (slave->dev == slave_dev) return slave; return NULL; } static inline struct bonding *bond_get_bond_by_slave(struct slave *slave) { if (!slave || !slave->bond) return NULL; return slave->bond; } static inline bool bond_is_lb(const struct bonding *bond) { return (bond->params.mode == BOND_MODE_TLB || bond->params.mode == BOND_MODE_ALB); } static inline void bond_set_active_slave(struct slave *slave) { slave->backup = 0; } static inline void bond_set_backup_slave(struct slave *slave) { slave->backup = 1; } static inline int bond_slave_state(struct slave *slave) { return slave->backup; } static inline bool bond_is_active_slave(struct slave *slave) { return !bond_slave_state(slave); } #define BOND_PRI_RESELECT_ALWAYS 0 #define BOND_PRI_RESELECT_BETTER 1 #define BOND_PRI_RESELECT_FAILURE 2 #define BOND_FOM_NONE 0 #define BOND_FOM_ACTIVE 1 #define BOND_FOM_FOLLOW 2 #define BOND_ARP_TARGETS_ANY 0 #define BOND_ARP_TARGETS_ALL 1 #define BOND_ARP_VALIDATE_NONE 0 #define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE) #define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP) #define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \ BOND_ARP_VALIDATE_BACKUP) static inline int slave_do_arp_validate(struct bonding *bond, struct slave *slave) { return bond->params.arp_validate & (1 << bond_slave_state(slave)); } /* Get the oldest arp which we've received on this slave for bond's * arp_targets. */ static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond, struct slave *slave) { int i = 1; unsigned long ret = slave->target_last_arp_rx[0]; for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++) if (time_before(slave->target_last_arp_rx[i], ret)) ret = slave->target_last_arp_rx[i]; return ret; } static inline unsigned long slave_last_rx(struct bonding *bond, struct slave *slave) { if (slave_do_arp_validate(bond, slave)) { if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL) return slave_oldest_target_arp_rx(bond, slave); else return slave->last_arp_rx; } return slave->dev->last_rx; } #ifdef CONFIG_NET_POLL_CONTROLLER static inline void bond_netpoll_send_skb(const struct slave *slave, struct sk_buff *skb) { struct netpoll *np = slave->np; if (np) netpoll_send_skb(np, skb); } #else static inline void bond_netpoll_send_skb(const struct slave *slave, struct sk_buff *skb) { } #endif static inline void bond_set_slave_inactive_flags(struct slave *slave) { if (!bond_is_lb(slave->bond)) bond_set_backup_slave(slave); if (!slave->bond->params.all_slaves_active) slave->inactive = 1; } static inline void bond_set_slave_active_flags(struct slave *slave) { bond_set_active_slave(slave); slave->inactive = 0; } static inline bool bond_is_slave_inactive(struct slave *slave) { return slave->inactive; } static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local) { struct in_device *in_dev; __be32 addr = 0; rcu_read_lock(); in_dev = __in_dev_get_rcu(dev); if (in_dev) addr = inet_confirm_addr(in_dev, dst, local, RT_SCOPE_HOST); rcu_read_unlock(); return addr; } static inline bool slave_can_tx(struct slave *slave) { if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP && bond_is_active_slave(slave)) return true; else return false; } struct bond_net; int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave); struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr); int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev); void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id); int bond_create(struct net *net, const char *name); int bond_create_sysfs(struct bond_net *net); void bond_destroy_sysfs(struct bond_net *net); void bond_prepare_sysfs_group(struct bonding *bond); int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave); void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave); int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev); int bond_release(struct net_device *bond_dev, struct net_device *slave_dev); void bond_mii_monitor(struct work_struct *); void bond_loadbalance_arp_mon(struct work_struct *); void bond_activebackup_arp_mon(struct work_struct *); void bond_set_mode_ops(struct bonding *bond, int mode); int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl); void bond_select_active_slave(struct bonding *bond); void bond_change_active_slave(struct bonding *bond, struct slave *new_active); void bond_create_debugfs(void); void bond_destroy_debugfs(void); void bond_debug_register(struct bonding *bond); void bond_debug_unregister(struct bonding *bond); void bond_debug_reregister(struct bonding *bond); const char *bond_mode_name(int mode); struct bond_net { struct net * net; /* Associated network namespace */ struct list_head dev_list; #ifdef CONFIG_PROC_FS struct proc_dir_entry * proc_dir; #endif struct class_attribute class_attr_bonding_masters; }; #ifdef CONFIG_PROC_FS void bond_create_proc_entry(struct bonding *bond); void bond_remove_proc_entry(struct bonding *bond); void bond_create_proc_dir(struct bond_net *bn); void bond_destroy_proc_dir(struct bond_net *bn); #else static inline void bond_create_proc_entry(struct bonding *bond) { } static inline void bond_remove_proc_entry(struct bonding *bond) { } static inline void bond_create_proc_dir(struct bond_net *bn) { } static inline void bond_destroy_proc_dir(struct bond_net *bn) { } #endif static inline struct slave *bond_slave_has_mac(struct bonding *bond, const u8 *mac) { struct slave *tmp; bond_for_each_slave(bond, tmp) if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr)) return tmp; return NULL; } /* Check if the ip is present in arp ip list, or first free slot if ip == 0 * Returns -1 if not found, index if found */ static inline int bond_get_targets_ip(__be32 *targets, __be32 ip) { int i; for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) if (targets[i] == ip) return i; else if (targets[i] == 0) break; return -1; } /* exported from bond_main.c */ extern int bond_net_id; extern const struct bond_parm_tbl bond_lacp_tbl[]; extern const struct bond_parm_tbl bond_mode_tbl[]; extern const struct bond_parm_tbl xmit_hashtype_tbl[]; extern const struct bond_parm_tbl arp_validate_tbl[]; extern const struct bond_parm_tbl arp_all_targets_tbl[]; extern const struct bond_parm_tbl fail_over_mac_tbl[]; extern const struct bond_parm_tbl pri_reselect_tbl[]; extern struct bond_parm_tbl ad_select_tbl[]; #endif /* _LINUX_BONDING_H */