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305d552acc
This patch adds better IPv6 failover support for bonding devices, especially when in active-backup mode and there are only IPv6 addresses configured, as reported by Alex Sidorenko. - Creates a new file, net/drivers/bonding/bond_ipv6.c, for the IPv6-specific routines. Both regular bonds and VLANs over bonds are supported. - Adds a new tunable, num_unsol_na, to limit the number of unsolicited IPv6 Neighbor Advertisements that are sent on a failover event. Default is 1. - Creates two new IPv6 neighbor discovery functions: ndisc_build_skb() ndisc_send_skb() These were required to support VLANs since we have to be able to add the VLAN id to the skb since ndisc_send_na() and friends shouldn't be asked to do this. These two routines are basically __ndisc_send() split into two pieces, in a slightly different order. - Updates Documentation/networking/bonding.txt and bumps the rev of bond support to 3.4.0. On failover, this new code will generate one packet: - An unsolicited IPv6 Neighbor Advertisement, which helps the switch learn that the address has moved to the new slave. Testing has shown that sending just the NA results in pretty good behavior when in active-back mode, I saw no lost ping packets for example. Signed-off-by: Brian Haley <brian.haley@hp.com> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
375 lines
10 KiB
C
375 lines
10 KiB
C
/*
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* Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
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*
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* Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
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* NCM: Network and Communications Management, Inc.
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*
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* BUT, I'm the one who modified it for ethernet, so:
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* (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
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*
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* This software may be used and distributed according to the terms
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* of the GNU Public License, incorporated herein by reference.
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*
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*/
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#ifndef _LINUX_BONDING_H
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#define _LINUX_BONDING_H
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#include <linux/timer.h>
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#include <linux/proc_fs.h>
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#include <linux/if_bonding.h>
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#include <linux/kobject.h>
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#include <linux/in6.h>
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#include "bond_3ad.h"
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#include "bond_alb.h"
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#define DRV_VERSION "3.4.0"
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#define DRV_RELDATE "October 7, 2008"
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#define DRV_NAME "bonding"
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#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
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#define BOND_MAX_ARP_TARGETS 16
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extern struct list_head bond_dev_list;
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#ifdef BONDING_DEBUG
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#define dprintk(fmt, args...) \
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printk(KERN_DEBUG \
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DRV_NAME ": %s() %d: " fmt, __func__, __LINE__ , ## args )
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#else
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#define dprintk(fmt, args...)
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#endif /* BONDING_DEBUG */
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#define IS_UP(dev) \
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((((dev)->flags & IFF_UP) == IFF_UP) && \
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netif_running(dev) && \
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netif_carrier_ok(dev))
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/*
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* Checks whether bond is ready for transmit.
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*
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* Caller must hold bond->lock
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*/
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#define BOND_IS_OK(bond) \
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(((bond)->dev->flags & IFF_UP) && \
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netif_running((bond)->dev) && \
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((bond)->slave_cnt > 0))
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/*
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* Checks whether slave is ready for transmit.
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*/
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#define SLAVE_IS_OK(slave) \
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(((slave)->dev->flags & IFF_UP) && \
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netif_running((slave)->dev) && \
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((slave)->link == BOND_LINK_UP) && \
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((slave)->state == BOND_STATE_ACTIVE))
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#define USES_PRIMARY(mode) \
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(((mode) == BOND_MODE_ACTIVEBACKUP) || \
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((mode) == BOND_MODE_TLB) || \
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((mode) == BOND_MODE_ALB))
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/*
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* Less bad way to call ioctl from within the kernel; this needs to be
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* done some other way to get the call out of interrupt context.
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* Needs "ioctl" variable to be supplied by calling context.
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*/
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#define IOCTL(dev, arg, cmd) ({ \
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int res = 0; \
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mm_segment_t fs = get_fs(); \
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set_fs(get_ds()); \
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res = ioctl(dev, arg, cmd); \
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set_fs(fs); \
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res; })
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/**
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* bond_for_each_slave_from - iterate the slaves list from a starting point
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* @bond: the bond holding this list.
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* @pos: current slave.
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* @cnt: counter for max number of moves
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* @start: starting point.
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*
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* Caller must hold bond->lock
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*/
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#define bond_for_each_slave_from(bond, pos, cnt, start) \
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for (cnt = 0, pos = start; \
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cnt < (bond)->slave_cnt; \
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cnt++, pos = (pos)->next)
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/**
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* bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
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* @bond: the bond holding this list.
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* @pos: current slave.
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* @cnt: counter for number max of moves
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* @start: start point.
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* @stop: stop point.
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*
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* Caller must hold bond->lock
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*/
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#define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
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for (cnt = 0, pos = start; \
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((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
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cnt++, pos = (pos)->next)
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/**
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* bond_for_each_slave - iterate the slaves list from head
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* @bond: the bond holding this list.
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* @pos: current slave.
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* @cnt: counter for max number of moves
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*
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* Caller must hold bond->lock
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*/
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#define bond_for_each_slave(bond, pos, cnt) \
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bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
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struct bond_params {
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int mode;
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int xmit_policy;
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int miimon;
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int num_grat_arp;
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int num_unsol_na;
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int arp_interval;
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int arp_validate;
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int use_carrier;
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int fail_over_mac;
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int updelay;
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int downdelay;
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int lacp_fast;
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char primary[IFNAMSIZ];
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__be32 arp_targets[BOND_MAX_ARP_TARGETS];
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};
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struct bond_parm_tbl {
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char *modename;
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int mode;
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};
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#define BOND_MAX_MODENAME_LEN 20
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struct vlan_entry {
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struct list_head vlan_list;
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__be32 vlan_ip;
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unsigned short vlan_id;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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struct in6_addr vlan_ipv6;
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#endif
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};
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struct slave {
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struct net_device *dev; /* first - useful for panic debug */
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struct slave *next;
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struct slave *prev;
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int delay;
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unsigned long jiffies;
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unsigned long last_arp_rx;
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s8 link; /* one of BOND_LINK_XXXX */
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s8 new_link;
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s8 state; /* one of BOND_STATE_XXXX */
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u32 original_flags;
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u32 original_mtu;
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u32 link_failure_count;
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u16 speed;
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u8 duplex;
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u8 perm_hwaddr[ETH_ALEN];
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struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
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struct tlb_slave_info tlb_info;
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};
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/*
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* Link pseudo-state only used internally by monitors
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*/
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#define BOND_LINK_NOCHANGE -1
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/*
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* Here are the locking policies for the two bonding locks:
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*
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* 1) Get bond->lock when reading/writing slave list.
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* 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
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* (It is unnecessary when the write-lock is put with bond->lock.)
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* 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
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* beforehand.
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*/
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struct bonding {
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struct net_device *dev; /* first - useful for panic debug */
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struct slave *first_slave;
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struct slave *curr_active_slave;
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struct slave *current_arp_slave;
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struct slave *primary_slave;
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s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
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rwlock_t lock;
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rwlock_t curr_slave_lock;
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s8 kill_timers;
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s8 send_grat_arp;
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s8 send_unsol_na;
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s8 setup_by_slave;
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struct net_device_stats stats;
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_entry;
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char proc_file_name[IFNAMSIZ];
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#endif /* CONFIG_PROC_FS */
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struct list_head bond_list;
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struct dev_mc_list *mc_list;
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int (*xmit_hash_policy)(struct sk_buff *, struct net_device *, int);
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__be32 master_ip;
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u16 flags;
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u16 rr_tx_counter;
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struct ad_bond_info ad_info;
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struct alb_bond_info alb_info;
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struct bond_params params;
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struct list_head vlan_list;
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struct vlan_group *vlgrp;
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struct packet_type arp_mon_pt;
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struct workqueue_struct *wq;
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struct delayed_work mii_work;
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struct delayed_work arp_work;
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struct delayed_work alb_work;
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struct delayed_work ad_work;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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struct in6_addr master_ipv6;
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#endif
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};
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/**
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* Returns NULL if the net_device does not belong to any of the bond's slaves
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*
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* Caller must hold bond lock for read
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*/
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static inline struct slave *bond_get_slave_by_dev(struct bonding *bond, struct net_device *slave_dev)
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{
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struct slave *slave = NULL;
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int i;
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bond_for_each_slave(bond, slave, i) {
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if (slave->dev == slave_dev) {
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break;
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}
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}
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return slave;
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}
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static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
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{
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if (!slave || !slave->dev->master) {
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return NULL;
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}
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return (struct bonding *)slave->dev->master->priv;
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}
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#define BOND_FOM_NONE 0
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#define BOND_FOM_ACTIVE 1
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#define BOND_FOM_FOLLOW 2
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#define BOND_ARP_VALIDATE_NONE 0
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#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
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#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
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#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
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BOND_ARP_VALIDATE_BACKUP)
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static inline int slave_do_arp_validate(struct bonding *bond,
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struct slave *slave)
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{
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return bond->params.arp_validate & (1 << slave->state);
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}
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static inline unsigned long slave_last_rx(struct bonding *bond,
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struct slave *slave)
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{
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if (slave_do_arp_validate(bond, slave))
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return slave->last_arp_rx;
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return slave->dev->last_rx;
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}
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static inline void bond_set_slave_inactive_flags(struct slave *slave)
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{
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struct bonding *bond = slave->dev->master->priv;
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if (bond->params.mode != BOND_MODE_TLB &&
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bond->params.mode != BOND_MODE_ALB)
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slave->state = BOND_STATE_BACKUP;
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slave->dev->priv_flags |= IFF_SLAVE_INACTIVE;
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if (slave_do_arp_validate(bond, slave))
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slave->dev->priv_flags |= IFF_SLAVE_NEEDARP;
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}
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static inline void bond_set_slave_active_flags(struct slave *slave)
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{
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slave->state = BOND_STATE_ACTIVE;
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slave->dev->priv_flags &= ~(IFF_SLAVE_INACTIVE | IFF_SLAVE_NEEDARP);
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}
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static inline void bond_set_master_3ad_flags(struct bonding *bond)
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{
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bond->dev->priv_flags |= IFF_MASTER_8023AD;
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}
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static inline void bond_unset_master_3ad_flags(struct bonding *bond)
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{
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bond->dev->priv_flags &= ~IFF_MASTER_8023AD;
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}
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static inline void bond_set_master_alb_flags(struct bonding *bond)
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{
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bond->dev->priv_flags |= IFF_MASTER_ALB;
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}
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static inline void bond_unset_master_alb_flags(struct bonding *bond)
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{
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bond->dev->priv_flags &= ~IFF_MASTER_ALB;
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}
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struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
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int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
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int bond_create(char *name, struct bond_params *params);
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void bond_destroy(struct bonding *bond);
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int bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev);
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int bond_create_sysfs(void);
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void bond_destroy_sysfs(void);
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void bond_destroy_sysfs_entry(struct bonding *bond);
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int bond_create_sysfs_entry(struct bonding *bond);
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int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
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void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
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int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
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int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
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void bond_mii_monitor(struct work_struct *);
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void bond_loadbalance_arp_mon(struct work_struct *);
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void bond_activebackup_arp_mon(struct work_struct *);
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void bond_set_mode_ops(struct bonding *bond, int mode);
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int bond_parse_parm(const char *mode_arg, struct bond_parm_tbl *tbl);
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void bond_select_active_slave(struct bonding *bond);
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void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
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void bond_register_arp(struct bonding *);
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void bond_unregister_arp(struct bonding *);
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/* exported from bond_main.c */
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extern struct list_head bond_dev_list;
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extern struct bond_parm_tbl bond_lacp_tbl[];
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extern struct bond_parm_tbl bond_mode_tbl[];
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extern struct bond_parm_tbl xmit_hashtype_tbl[];
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extern struct bond_parm_tbl arp_validate_tbl[];
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extern struct bond_parm_tbl fail_over_mac_tbl[];
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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void bond_send_unsolicited_na(struct bonding *bond);
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void bond_register_ipv6_notifier(void);
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void bond_unregister_ipv6_notifier(void);
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#else
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static inline void bond_send_unsolicited_na(struct bonding *bond)
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{
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return;
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}
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static inline void bond_register_ipv6_notifier(void)
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{
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return;
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}
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static inline void bond_unregister_ipv6_notifier(void)
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{
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return;
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}
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#endif
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#endif /* _LINUX_BONDING_H */
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