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15077228ca
linux_dsm_epyc7002/drivers/net/bonding/bonding.h
Nikolay Aleksandrov 15077228ca bonding: factor out slave id tx code and simplify xmit paths 
I factored out the tx xmit code which relies on slave id in
bond_xmit_slave_id. It is global because later it can be used also in
3ad mode xmit. Unnecessary obvious comments are removed. Active-backup
mode is simplified because bond_dev_queue_xmit always consumes the skb.
bond_xmit_xor becomes one line because of bond_xmit_slave_id.
bond_for_each_slave_from is not used in bond_xmit_slave_id because later
when RCU is used we can avoid important race condition by using standard
rculist routines.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-08-01 16:42:02 -07:00

537 lines
14 KiB
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/*
* 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 <linux/timer.h>
#include <linux/proc_fs.h>
#include <linux/if_bonding.h>
#include <linux/cpumask.h>
#include <linux/in6.h>
#include <linux/netpoll.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#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)
/**
* 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;
};
struct bond_parm_tbl {
char *modename;
int mode;
};
#define BOND_MAX_MODENAME_LEN 20
struct vlan_entry {
struct list_head vlan_list;
unsigned short vlan_id;
};
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 list_head vlan_list;
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 */
};
static inline bool bond_vlan_used(struct bonding *bond)
{
return !list_empty(&bond->vlan_list);
}
#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;
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 */
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