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TOMOYO Linux Cross Reference
Linux/include/net/bond_alb.h

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  1 /*
  2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or modify it
  5  * under the terms of the GNU General Public License as published by the
  6  * Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License along
 15  * with this program; if not, see <http://www.gnu.org/licenses/>.
 16  *
 17  * The full GNU General Public License is included in this distribution in the
 18  * file called LICENSE.
 19  *
 20  */
 21 
 22 #ifndef _NET_BOND_ALB_H
 23 #define _NET_BOND_ALB_H
 24 
 25 #include <linux/if_ether.h>
 26 
 27 struct bonding;
 28 struct slave;
 29 
 30 #define BOND_ALB_INFO(bond)   ((bond)->alb_info)
 31 #define SLAVE_TLB_INFO(slave) ((slave)->tlb_info)
 32 
 33 #define ALB_TIMER_TICKS_PER_SEC     10  /* should be a divisor of HZ */
 34 #define BOND_TLB_REBALANCE_INTERVAL 10  /* In seconds, periodic re-balancing.
 35                                          * Used for division - never set
 36                                          * to zero !!!
 37                                          */
 38 #define BOND_ALB_DEFAULT_LP_INTERVAL 1
 39 #define BOND_ALB_LP_INTERVAL(bond) (bond->params.lp_interval)   /* In seconds, periodic send of
 40                                                                  * learning packets to the switch
 41                                                                  */
 42 
 43 #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \
 44                                   * ALB_TIMER_TICKS_PER_SEC)
 45 
 46 #define BOND_ALB_LP_TICKS(bond) (BOND_ALB_LP_INTERVAL(bond) \
 47                            * ALB_TIMER_TICKS_PER_SEC)
 48 
 49 #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table.
 50                                  * Note that this value MUST NOT be smaller
 51                                  * because the key hash table is BYTE wide !
 52                                  */
 53 
 54 
 55 #define TLB_NULL_INDEX          0xffffffff
 56 
 57 /* rlb defs */
 58 #define RLB_HASH_TABLE_SIZE     256
 59 #define RLB_NULL_INDEX          0xffffffff
 60 #define RLB_UPDATE_DELAY        (2*ALB_TIMER_TICKS_PER_SEC) /* 2 seconds */
 61 #define RLB_ARP_BURST_SIZE      2
 62 #define RLB_UPDATE_RETRY        3 /* 3-ticks - must be smaller than the rlb
 63                                    * rebalance interval (5 min).
 64                                    */
 65 /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
 66  * promiscuous after failover
 67  */
 68 #define RLB_PROMISC_TIMEOUT     (10*ALB_TIMER_TICKS_PER_SEC)
 69 
 70 
 71 struct tlb_client_info {
 72         struct slave *tx_slave; /* A pointer to slave used for transmiting
 73                                  * packets to a Client that the Hash function
 74                                  * gave this entry index.
 75                                  */
 76         u32 tx_bytes;           /* Each Client accumulates the BytesTx that
 77                                  * were transmitted to it, and after each
 78                                  * CallBack the LoadHistory is divided
 79                                  * by the balance interval
 80                                  */
 81         u32 load_history;       /* This field contains the amount of Bytes
 82                                  * that were transmitted to this client by
 83                                  * the server on the previous balance
 84                                  * interval in Bps.
 85                                  */
 86         u32 next;               /* The next Hash table entry index, assigned
 87                                  * to use the same adapter for transmit.
 88                                  */
 89         u32 prev;               /* The previous Hash table entry index,
 90                                  * assigned to use the same
 91                                  */
 92 };
 93 
 94 /* -------------------------------------------------------------------------
 95  * struct rlb_client_info contains all info related to a specific rx client
 96  * connection. This is the Clients Hash Table entry struct.
 97  * Note that this is not a proper hash table; if a new client's IP address
 98  * hash collides with an existing client entry, the old entry is replaced.
 99  *
100  * There is a linked list (linked by the used_next and used_prev members)
101  * linking all the used entries of the hash table. This allows updating
102  * all the clients without walking over all the unused elements of the table.
103  *
104  * There are also linked lists of entries with identical hash(ip_src). These
105  * allow cleaning up the table from ip_src<->mac_src associations that have
106  * become outdated and would cause sending out invalid ARP updates to the
107  * network. These are linked by the (src_next and src_prev members).
108  * -------------------------------------------------------------------------
109  */
110 struct rlb_client_info {
111         __be32 ip_src;          /* the server IP address */
112         __be32 ip_dst;          /* the client IP address */
113         u8  mac_src[ETH_ALEN];  /* the server MAC address */
114         u8  mac_dst[ETH_ALEN];  /* the client MAC address */
115 
116         /* list of used hash table entries, starting at rx_hashtbl_used_head */
117         u32 used_next;
118         u32 used_prev;
119 
120         /* ip_src based hashing */
121         u32 src_next;   /* next entry with same hash(ip_src) */
122         u32 src_prev;   /* prev entry with same hash(ip_src) */
123         u32 src_first;  /* first entry with hash(ip_src) == this entry's index */
124 
125         u8  assigned;           /* checking whether this entry is assigned */
126         u8  ntt;                /* flag - need to transmit client info */
127         struct slave *slave;    /* the slave assigned to this client */
128         unsigned short vlan_id; /* VLAN tag associated with IP address */
129 };
130 
131 struct tlb_slave_info {
132         u32 head;       /* Index to the head of the bi-directional clients
133                          * hash table entries list. The entries in the list
134                          * are the entries that were assigned to use this
135                          * slave for transmit.
136                          */
137         u32 load;       /* Each slave sums the loadHistory of all clients
138                          * assigned to it
139                          */
140 };
141 
142 struct alb_bond_info {
143         struct tlb_client_info  *tx_hashtbl; /* Dynamically allocated */
144         u32                     unbalanced_load;
145         int                     tx_rebalance_counter;
146         int                     lp_counter;
147         /* -------- rlb parameters -------- */
148         int rlb_enabled;
149         struct rlb_client_info  *rx_hashtbl;    /* Receive hash table */
150         u32                     rx_hashtbl_used_head;
151         u8                      rx_ntt; /* flag - need to transmit
152                                          * to all rx clients
153                                          */
154         struct slave            *rx_slave;/* last slave to xmit from */
155         u8                      primary_is_promisc;        /* boolean */
156         u32                     rlb_promisc_timeout_counter;/* counts primary
157                                                              * promiscuity time
158                                                              */
159         u32                     rlb_update_delay_counter;
160         u32                     rlb_update_retry_counter;/* counter of retries
161                                                           * of client update
162                                                           */
163         u8                      rlb_rebalance;  /* flag - indicates that the
164                                                  * rx traffic should be
165                                                  * rebalanced
166                                                  */
167 };
168 
169 int bond_alb_initialize(struct bonding *bond, int rlb_enabled);
170 void bond_alb_deinitialize(struct bonding *bond);
171 int bond_alb_init_slave(struct bonding *bond, struct slave *slave);
172 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave);
173 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link);
174 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave);
175 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
176 int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
177 void bond_alb_monitor(struct work_struct *);
178 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr);
179 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id);
180 #endif /* _NET_BOND_ALB_H */
181 
182 

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