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e53665c6ea
Bonding in balance-alb mode records information from ARP packets
passing through the bond in a hash table (rx_hashtbl).
At certain situations (e.g. link change of a slave),
rlb_update_rx_clients() will send out ARP packets to update ARP
caches of other hosts on the network to achieve RX load
balancing.
The problem is that once an IP address is recorded in the hash
table, it stays there indefinitely. If this IP address is
migrated to a different host in the network, bonding still sends
out ARP packets that poison other systems' ARP caches with
invalid information.
This patch solves this by looking at all incoming ARP packets,
and checking if the source IP address is one of the source
addresses stored in the rx_hashtbl. If it is, but the MAC
addresses differ, the corresponding hash table entries are
removed. Thus, when an IP address is migrated, the first ARP
broadcast by its new owner will purge the offending entries of
rx_hashtbl.
The hash table is hashed by ip_dst. To be able to do the above
check efficiently (not walking the whole hash table), we need a
reverse mapping (by ip_src).
I added three new members in struct rlb_client_info:
rx_hashtbl[x].src_first will point to the start of a list of
entries for which hash(ip_src) == x.
The list is linked with src_next and src_prev.
When an incoming ARP packet arrives at rlb_arp_recv()
rlb_purge_src_ip() can quickly walk only the entries on the
corresponding lists, i.e. the entries that are likely to contain
the offending IP address.
To avoid confusion, I renamed these existing fields of struct
rlb_client_info:
next -> used_next
prev -> used_prev
rx_hashtbl_head -> rx_hashtbl_used_head
(The current linked list is _not_ a list of hash table
entries with colliding ip_dst. It's a list of entries that are
being used; its purpose is to avoid walking the whole hash table
when looking for used entries.)
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
188 lines
6.7 KiB
C
188 lines
6.7 KiB
C
/*
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* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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*/
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#ifndef __BOND_ALB_H__
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#define __BOND_ALB_H__
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#include <linux/if_ether.h>
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struct bonding;
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struct slave;
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#define BOND_ALB_INFO(bond) ((bond)->alb_info)
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#define SLAVE_TLB_INFO(slave) ((slave)->tlb_info)
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#define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */
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#define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing.
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* Used for division - never set
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* to zero !!!
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*/
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#define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of
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* learning packets to the switch
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*/
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#define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
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* ALB_TIMER_TICKS_PER_SEC)
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#define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \
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* ALB_TIMER_TICKS_PER_SEC)
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#define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
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* Note that this value MUST NOT be smaller
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* because the key hash table is BYTE wide !
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*/
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#define TLB_NULL_INDEX 0xffffffff
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#define MAX_LP_BURST 3
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/* rlb defs */
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#define RLB_HASH_TABLE_SIZE 256
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#define RLB_NULL_INDEX 0xffffffff
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#define RLB_UPDATE_DELAY (2*ALB_TIMER_TICKS_PER_SEC) /* 2 seconds */
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#define RLB_ARP_BURST_SIZE 2
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#define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb
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* rebalance interval (5 min).
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*/
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/* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
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* promiscuous after failover
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*/
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#define RLB_PROMISC_TIMEOUT (10*ALB_TIMER_TICKS_PER_SEC)
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struct tlb_client_info {
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struct slave *tx_slave; /* A pointer to slave used for transmiting
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* packets to a Client that the Hash function
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* gave this entry index.
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*/
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u32 tx_bytes; /* Each Client accumulates the BytesTx that
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* were transmitted to it, and after each
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* CallBack the LoadHistory is divided
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* by the balance interval
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*/
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u32 load_history; /* This field contains the amount of Bytes
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* that were transmitted to this client by
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* the server on the previous balance
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* interval in Bps.
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*/
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u32 next; /* The next Hash table entry index, assigned
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* to use the same adapter for transmit.
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*/
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u32 prev; /* The previous Hash table entry index,
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* assigned to use the same
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*/
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};
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/* -------------------------------------------------------------------------
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* struct rlb_client_info contains all info related to a specific rx client
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* connection. This is the Clients Hash Table entry struct.
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* Note that this is not a proper hash table; if a new client's IP address
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* hash collides with an existing client entry, the old entry is replaced.
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*
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* There is a linked list (linked by the used_next and used_prev members)
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* linking all the used entries of the hash table. This allows updating
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* all the clients without walking over all the unused elements of the table.
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*
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* There are also linked lists of entries with identical hash(ip_src). These
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* allow cleaning up the table from ip_src<->mac_src associations that have
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* become outdated and would cause sending out invalid ARP updates to the
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* network. These are linked by the (src_next and src_prev members).
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* -------------------------------------------------------------------------
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*/
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struct rlb_client_info {
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__be32 ip_src; /* the server IP address */
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__be32 ip_dst; /* the client IP address */
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u8 mac_src[ETH_ALEN]; /* the server MAC address */
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u8 mac_dst[ETH_ALEN]; /* the client MAC address */
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/* list of used hash table entries, starting at rx_hashtbl_used_head */
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u32 used_next;
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u32 used_prev;
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/* ip_src based hashing */
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u32 src_next; /* next entry with same hash(ip_src) */
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u32 src_prev; /* prev entry with same hash(ip_src) */
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u32 src_first; /* first entry with hash(ip_src) == this entry's index */
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u8 assigned; /* checking whether this entry is assigned */
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u8 ntt; /* flag - need to transmit client info */
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struct slave *slave; /* the slave assigned to this client */
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u8 tag; /* flag - need to tag skb */
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unsigned short vlan_id; /* VLAN tag associated with IP address */
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};
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struct tlb_slave_info {
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u32 head; /* Index to the head of the bi-directional clients
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* hash table entries list. The entries in the list
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* are the entries that were assigned to use this
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* slave for transmit.
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*/
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u32 load; /* Each slave sums the loadHistory of all clients
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* assigned to it
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*/
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};
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struct alb_bond_info {
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struct tlb_client_info *tx_hashtbl; /* Dynamically allocated */
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spinlock_t tx_hashtbl_lock;
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u32 unbalanced_load;
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int tx_rebalance_counter;
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int lp_counter;
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/* -------- rlb parameters -------- */
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int rlb_enabled;
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struct rlb_client_info *rx_hashtbl; /* Receive hash table */
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spinlock_t rx_hashtbl_lock;
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u32 rx_hashtbl_used_head;
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u8 rx_ntt; /* flag - need to transmit
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* to all rx clients
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*/
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struct slave *next_rx_slave;/* next slave to be assigned
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* to a new rx client for
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*/
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u8 primary_is_promisc; /* boolean */
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u32 rlb_promisc_timeout_counter;/* counts primary
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* promiscuity time
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*/
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u32 rlb_update_delay_counter;
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u32 rlb_update_retry_counter;/* counter of retries
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* of client update
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*/
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u8 rlb_rebalance; /* flag - indicates that the
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* rx traffic should be
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* rebalanced
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*/
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struct vlan_entry *current_alb_vlan;
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};
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int bond_alb_initialize(struct bonding *bond, int rlb_enabled);
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void bond_alb_deinitialize(struct bonding *bond);
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int bond_alb_init_slave(struct bonding *bond, struct slave *slave);
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void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave);
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void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link);
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void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave);
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int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
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void bond_alb_monitor(struct work_struct *);
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int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr);
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void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id);
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#endif /* __BOND_ALB_H__ */
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