drivers/net/bonding/bond_alb.h

   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, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #ifndef __BOND_ALB_H__
  24 #define __BOND_ALB_H__
  25
  26 #include <linux/if_ether.h>
  27
  28 struct bonding;
  29 struct slave;
  30
  31 #define BOND_ALB_INFO(bond)   ((bond)->alb_info)
  32 #define SLAVE_TLB_INFO(slave) ((slave)->tlb_info)
  33
  34 #define ALB_TIMER_TICKS_PER_SEC     10  /* should be a divisor of HZ */
  35 #define BOND_TLB_REBALANCE_INTERVAL 10  /* In seconds, periodic re-balancing.
  36                                          * Used for division - never set
  37                                          * to zero !!!
  38                                          */
  39 #define BOND_ALB_LP_INTERVAL        1   /* 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_ALB_LP_INTERVAL \
  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 #define MAX_LP_BURST            3
  57
  58 /* rlb defs */
  59 #define RLB_HASH_TABLE_SIZE     256
  60 #define RLB_NULL_INDEX          0xffffffff
  61 #define RLB_UPDATE_DELAY        (2*ALB_TIMER_TICKS_PER_SEC) /* 2 seconds */
  62 #define RLB_ARP_BURST_SIZE      2
  63 #define RLB_UPDATE_RETRY        3 /* 3-ticks - must be smaller than the rlb
  64                                    * rebalance interval (5 min).
  65                                    */
  66 /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is
  67  * promiscuous after failover
  68  */
  69 #define RLB_PROMISC_TIMEOUT     (10*ALB_TIMER_TICKS_PER_SEC)
  70
  71
  72 struct tlb_client_info {
  73         struct slave *tx_slave; /* A pointer to slave used for transmiting
  74                                  * packets to a Client that the Hash function
  75                                  * gave this entry index.
  76                                  */
  77         u32 tx_bytes;           /* Each Client accumulates the BytesTx that
  78                                  * were transmitted to it, and after each
  79                                  * CallBack the LoadHistory is divided
  80                                  * by the balance interval
  81                                  */
  82         u32 load_history;       /* This field contains the amount of Bytes
  83                                  * that were transmitted to this client by
  84                                  * the server on the previous balance
  85                                  * interval in Bps.
  86                                  */
  87         u32 next;               /* The next Hash table entry index, assigned
  88                                  * to use the same adapter for transmit.
  89                                  */
  90         u32 prev;               /* The previous Hash table entry index,
  91                                  * assigned to use the same
  92                                  */
  93 };
  94
  95 /* -------------------------------------------------------------------------
  96  * struct rlb_client_info contains all info related to a specific rx client
  97  * connection. This is the Clients Hash Table entry struct.
  98  * Note that this is not a proper hash table; if a new client's IP address
  99  * hash collides with an existing client entry, the old entry is replaced.
 100  *
 101  * There is a linked list (linked by the used_next and used_prev members)
 102  * linking all the used entries of the hash table. This allows updating
 103  * all the clients without walking over all the unused elements of the table.
 104  *
 105  * There are also linked lists of entries with identical hash(ip_src). These
 106  * allow cleaning up the table from ip_src<->mac_src associations that have
 107  * become outdated and would cause sending out invalid ARP updates to the
 108  * network. These are linked by the (src_next and src_prev members).
 109  * -------------------------------------------------------------------------
 110  */
 111 struct rlb_client_info {
 112         __be32 ip_src;          /* the server IP address */
 113         __be32 ip_dst;          /* the client IP address */
 114         u8  mac_src[ETH_ALEN];  /* the server MAC address */
 115         u8  mac_dst[ETH_ALEN];  /* the client MAC address */
 116
 117         /* list of used hash table entries, starting at rx_hashtbl_used_head */
 118         u32 used_next;
 119         u32 used_prev;
 120
 121         /* ip_src based hashing */
 122         u32 src_next;   /* next entry with same hash(ip_src) */
 123         u32 src_prev;   /* prev entry with same hash(ip_src) */
 124         u32 src_first;  /* first entry with hash(ip_src) == this entry's index */
 125
 126         u8  assigned;           /* checking whether this entry is assigned */
 127         u8  ntt;                /* flag - need to transmit client info */
 128         struct slave *slave;    /* the slave assigned to this client */
 129         u8 tag;                 /* flag - need to tag skb */
 130         unsigned short vlan_id; /* VLAN tag associated with IP address */
 131 };
 132
 133 struct tlb_slave_info {
 134         u32 head;       /* Index to the head of the bi-directional clients
 135                          * hash table entries list. The entries in the list
 136                          * are the entries that were assigned to use this
 137                          * slave for transmit.
 138                          */
 139         u32 load;       /* Each slave sums the loadHistory of all clients
 140                          * assigned to it
 141                          */
 142 };
 143
 144 struct alb_bond_info {
 145         struct tlb_client_info  *tx_hashtbl; /* Dynamically allocated */
 146         spinlock_t              tx_hashtbl_lock;
 147         u32                     unbalanced_load;
 148         int                     tx_rebalance_counter;
 149         int                     lp_counter;
 150         /* -------- rlb parameters -------- */
 151         int rlb_enabled;
 152         struct rlb_client_info  *rx_hashtbl;    /* Receive hash table */
 153         spinlock_t              rx_hashtbl_lock;
 154         u32                     rx_hashtbl_used_head;
 155         u8                      rx_ntt; /* flag - need to transmit
 156                                          * to all rx clients
 157                                          */
 158         struct slave            *next_rx_slave;/* next slave to be assigned
 159                                                 * to a new rx client for
 160                                                 */
 161         u8                      primary_is_promisc;        /* boolean */
 162         u32                     rlb_promisc_timeout_counter;/* counts primary
 163                                                              * promiscuity time
 164                                                              */
 165         u32                     rlb_update_delay_counter;
 166         u32                     rlb_update_retry_counter;/* counter of retries
 167                                                           * of client update
 168                                                           */
 169         u8                      rlb_rebalance;  /* flag - indicates that the
 170                                                  * rx traffic should be
 171                                                  * rebalanced
 172                                                  */
 173         struct vlan_entry       *current_alb_vlan;
 174 };
 175
 176 int bond_alb_initialize(struct bonding *bond, int rlb_enabled);
 177 void bond_alb_deinitialize(struct bonding *bond);
 178 int bond_alb_init_slave(struct bonding *bond, struct slave *slave);
 179 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave);
 180 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link);
 181 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave);
 182 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
 183 void bond_alb_monitor(struct work_struct *);
 184 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr);
 185 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id);
 186 #endif /* __BOND_ALB_H__ */
 187