net/tipc/bcast.h

   1 /*
   2  * net/tipc/bcast.h: Include file for TIPC broadcast code
   3  *
   4  * Copyright (c) 2003-2006, Ericsson AB
   5  * Copyright (c) 2005, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _TIPC_BCAST_H
  38 #define _TIPC_BCAST_H
  39
  40 #define MAX_NODES 4096
  41 #define WSIZE 32
  42
  43 /**
  44  * struct node_map - set of node identifiers
  45  * @count: # of nodes in set
  46  * @map: bitmap of node identifiers that are in the set
  47  */
  48
  49 struct node_map {
  50         u32 count;
  51         u32 map[MAX_NODES / WSIZE];
  52 };
  53
  54
  55 #define PLSIZE 32
  56
  57 /**
  58  * struct port_list - set of node local destination ports
  59  * @count: # of ports in set (only valid for first entry in list)
  60  * @next: pointer to next entry in list
  61  * @ports: array of port references
  62  */
  63
  64 struct port_list {
  65         int count;
  66         struct port_list *next;
  67         u32 ports[PLSIZE];
  68 };
  69
  70
  71 struct node;
  72
  73 extern char tipc_bclink_name[];
  74
  75
  76 /**
  77  * nmap_get - determine if node exists in a node map
  78  */
  79
  80 static inline int tipc_nmap_get(struct node_map *nm_ptr, u32 node)
  81 {
  82         int n = tipc_node(node);
  83         int w = n / WSIZE;
  84         int b = n % WSIZE;
  85
  86         return nm_ptr->map[w] & (1 << b);
  87 }
  88
  89 /**
  90  * nmap_add - add a node to a node map
  91  */
  92
  93 static inline void tipc_nmap_add(struct node_map *nm_ptr, u32 node)
  94 {
  95         int n = tipc_node(node);
  96         int w = n / WSIZE;
  97         u32 mask = (1 << (n % WSIZE));
  98
  99         if ((nm_ptr->map[w] & mask) == 0) {
 100                 nm_ptr->count++;
 101                 nm_ptr->map[w] |= mask;
 102         }
 103 }
 104
 105 /**
 106  * nmap_remove - remove a node from a node map
 107  */
 108
 109 static inline void tipc_nmap_remove(struct node_map *nm_ptr, u32 node)
 110 {
 111         int n = tipc_node(node);
 112         int w = n / WSIZE;
 113         u32 mask = (1 << (n % WSIZE));
 114
 115         if ((nm_ptr->map[w] & mask) != 0) {
 116                 nm_ptr->map[w] &= ~mask;
 117                 nm_ptr->count--;
 118         }
 119 }
 120
 121 /**
 122  * nmap_equal - test for equality of node maps
 123  */
 124
 125 static inline int tipc_nmap_equal(struct node_map *nm_a, struct node_map *nm_b)
 126 {
 127         return !memcmp(nm_a, nm_b, sizeof(*nm_a));
 128 }
 129
 130 /**
 131  * nmap_diff - find differences between node maps
 132  * @nm_a: input node map A
 133  * @nm_b: input node map B
 134  * @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
 135  */
 136
 137 static inline void tipc_nmap_diff(struct node_map *nm_a, struct node_map *nm_b,
 138                                   struct node_map *nm_diff)
 139 {
 140         int stop = sizeof(nm_a->map) / sizeof(u32);
 141         int w;
 142         int b;
 143         u32 map;
 144
 145         memset(nm_diff, 0, sizeof(*nm_diff));
 146         for (w = 0; w < stop; w++) {
 147                 map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]);
 148                 nm_diff->map[w] = map;
 149                 if (map != 0) {
 150                         for (b = 0 ; b < WSIZE; b++) {
 151                                 if (map & (1 << b))
 152                                         nm_diff->count++;
 153                         }
 154                 }
 155         }
 156 }
 157
 158 /**
 159  * port_list_add - add a port to a port list, ensuring no duplicates
 160  */
 161
 162 static inline void tipc_port_list_add(struct port_list *pl_ptr, u32 port)
 163 {
 164         struct port_list *item = pl_ptr;
 165         int i;
 166         int item_sz = PLSIZE;
 167         int cnt = pl_ptr->count;
 168
 169         for (; ; cnt -= item_sz, item = item->next) {
 170                 if (cnt < PLSIZE)
 171                         item_sz = cnt;
 172                 for (i = 0; i < item_sz; i++)
 173                         if (item->ports[i] == port)
 174                                 return;
 175                 if (i < PLSIZE) {
 176                         item->ports[i] = port;
 177                         pl_ptr->count++;
 178                         return;
 179                 }
 180                 if (!item->next) {
 181                         item->next = kmalloc(sizeof(*item), GFP_ATOMIC);
 182                         if (!item->next) {
 183                                 warn("Memory squeeze: multicast destination port list is incomplete\n");
 184                                 return;
 185                         }
 186                         item->next->next = NULL;
 187                 }
 188         }
 189 }
 190
 191 /**
 192  * port_list_free - free dynamically created entries in port_list chain
 193  *
 194  * Note: First item is on stack, so it doesn't need to be released
 195  */
 196
 197 static inline void tipc_port_list_free(struct port_list *pl_ptr)
 198 {
 199         struct port_list *item;
 200         struct port_list *next;
 201
 202         for (item = pl_ptr->next; item; item = next) {
 203                 next = item->next;
 204                 kfree(item);
 205         }
 206 }
 207
 208
 209 int  tipc_bclink_init(void);
 210 void tipc_bclink_stop(void);
 211 void tipc_bclink_acknowledge(struct node *n_ptr, u32 acked);
 212 int  tipc_bclink_send_msg(struct sk_buff *buf);
 213 void tipc_bclink_recv_pkt(struct sk_buff *buf);
 214 u32  tipc_bclink_get_last_sent(void);
 215 u32  tipc_bclink_acks_missing(struct node *n_ptr);
 216 void tipc_bclink_check_gap(struct node *n_ptr, u32 seqno);
 217 int  tipc_bclink_stats(char *stats_buf, const u32 buf_size);
 218 int  tipc_bclink_reset_stats(void);
 219 int  tipc_bclink_set_queue_limits(u32 limit);
 220 void tipc_bcbearer_sort(void);
 221 void tipc_bcbearer_push(void);
 222
 223 #endif