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 	atomic_t		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