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linux/net/tipc/cluster.c
Allan Stephens 0e35fd5e52 tipc: Eliminate improper use of TIPC_OK error code 
This patch corrects many places where TIPC routines indicated
successful completion by returning TIPC_OK instead of 0.
(The TIPC_OK symbol has the value 0, but it should only be used
in contexts that deal with the error code field of a TIPC
message header.)

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-14 22:44:01 -07:00

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/*
* net/tipc/cluster.c: TIPC cluster management routines
*
* Copyright (c) 2000-2006, Ericsson AB
* Copyright (c) 2005, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "core.h"
#include "cluster.h"
#include "addr.h"
#include "node_subscr.h"
#include "link.h"
#include "node.h"
#include "net.h"
#include "msg.h"
#include "bearer.h"
static void tipc_cltr_multicast(struct cluster *c_ptr, struct sk_buff *buf,
u32 lower, u32 upper);
static struct sk_buff *tipc_cltr_prepare_routing_msg(u32 data_size, u32 dest);
struct node **tipc_local_nodes = NULL;
struct node_map tipc_cltr_bcast_nodes = {0,{0,}};
u32 tipc_highest_allowed_slave = 0;
struct cluster *tipc_cltr_create(u32 addr)
{
struct _zone *z_ptr;
struct cluster *c_ptr;
int max_nodes;
c_ptr = kzalloc(sizeof(*c_ptr), GFP_ATOMIC);
if (c_ptr == NULL) {
warn("Cluster creation failure, no memory\n");
return NULL;
}
c_ptr->addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
if (in_own_cluster(addr))
max_nodes = LOWEST_SLAVE + tipc_max_slaves;
else
max_nodes = tipc_max_nodes + 1;
c_ptr->nodes = kcalloc(max_nodes + 1, sizeof(void*), GFP_ATOMIC);
if (c_ptr->nodes == NULL) {
warn("Cluster creation failure, no memory for node area\n");
kfree(c_ptr);
return NULL;
}
if (in_own_cluster(addr))
tipc_local_nodes = c_ptr->nodes;
c_ptr->highest_slave = LOWEST_SLAVE - 1;
c_ptr->highest_node = 0;
z_ptr = tipc_zone_find(tipc_zone(addr));
if (!z_ptr) {
z_ptr = tipc_zone_create(addr);
}
if (!z_ptr) {
kfree(c_ptr->nodes);
kfree(c_ptr);
return NULL;
}
tipc_zone_attach_cluster(z_ptr, c_ptr);
c_ptr->owner = z_ptr;
return c_ptr;
}
void tipc_cltr_delete(struct cluster *c_ptr)
{
u32 n_num;
if (!c_ptr)
return;
for (n_num = 1; n_num <= c_ptr->highest_node; n_num++) {
tipc_node_delete(c_ptr->nodes[n_num]);
}
for (n_num = LOWEST_SLAVE; n_num <= c_ptr->highest_slave; n_num++) {
tipc_node_delete(c_ptr->nodes[n_num]);
}
kfree(c_ptr->nodes);
kfree(c_ptr);
}
u32 tipc_cltr_next_node(struct cluster *c_ptr, u32 addr)
{
struct node *n_ptr;
u32 n_num = tipc_node(addr) + 1;
if (!c_ptr)
return addr;
for (; n_num <= c_ptr->highest_node; n_num++) {
n_ptr = c_ptr->nodes[n_num];
if (n_ptr && tipc_node_has_active_links(n_ptr))
return n_ptr->addr;
}
for (n_num = 1; n_num < tipc_node(addr); n_num++) {
n_ptr = c_ptr->nodes[n_num];
if (n_ptr && tipc_node_has_active_links(n_ptr))
return n_ptr->addr;
}
return 0;
}
void tipc_cltr_attach_node(struct cluster *c_ptr, struct node *n_ptr)
{
u32 n_num = tipc_node(n_ptr->addr);
u32 max_n_num = tipc_max_nodes;
if (in_own_cluster(n_ptr->addr))
max_n_num = tipc_highest_allowed_slave;
assert(n_num > 0);
assert(n_num <= max_n_num);
assert(c_ptr->nodes[n_num] == NULL);
c_ptr->nodes[n_num] = n_ptr;
if (n_num > c_ptr->highest_node)
c_ptr->highest_node = n_num;
}
/**
* tipc_cltr_select_router - select router to a cluster
*
* Uses deterministic and fair algorithm.
*/
u32 tipc_cltr_select_router(struct cluster *c_ptr, u32 ref)
{
u32 n_num;
u32 ulim = c_ptr->highest_node;
u32 mask;
u32 tstart;
assert(!in_own_cluster(c_ptr->addr));
if (!ulim)
return 0;
/* Start entry must be random */
mask = tipc_max_nodes;
while (mask > ulim)
mask >>= 1;
tstart = ref & mask;
n_num = tstart;
/* Lookup upwards with wrap-around */
do {
if (tipc_node_is_up(c_ptr->nodes[n_num]))
break;
} while (++n_num <= ulim);
if (n_num > ulim) {
n_num = 1;
do {
if (tipc_node_is_up(c_ptr->nodes[n_num]))
break;
} while (++n_num < tstart);
if (n_num == tstart)
return 0;
}
assert(n_num <= ulim);
return tipc_node_select_router(c_ptr->nodes[n_num], ref);
}
/**
* tipc_cltr_select_node - select destination node within a remote cluster
*
* Uses deterministic and fair algorithm.
*/
struct node *tipc_cltr_select_node(struct cluster *c_ptr, u32 selector)
{
u32 n_num;
u32 mask = tipc_max_nodes;
u32 start_entry;
assert(!in_own_cluster(c_ptr->addr));
if (!c_ptr->highest_node)
return NULL;
/* Start entry must be random */
while (mask > c_ptr->highest_node) {
mask >>= 1;
}
start_entry = (selector & mask) ? selector & mask : 1u;
assert(start_entry <= c_ptr->highest_node);
/* Lookup upwards with wrap-around */
for (n_num = start_entry; n_num <= c_ptr->highest_node; n_num++) {
if (tipc_node_has_active_links(c_ptr->nodes[n_num]))
return c_ptr->nodes[n_num];
}
for (n_num = 1; n_num < start_entry; n_num++) {
if (tipc_node_has_active_links(c_ptr->nodes[n_num]))
return c_ptr->nodes[n_num];
}
return NULL;
}
/*
* Routing table management: See description in node.c
*/
static struct sk_buff *tipc_cltr_prepare_routing_msg(u32 data_size, u32 dest)
{
u32 size = INT_H_SIZE + data_size;
struct sk_buff *buf = buf_acquire(size);
struct tipc_msg *msg;
if (buf) {
msg = buf_msg(buf);
memset((char *)msg, 0, size);
msg_init(msg, ROUTE_DISTRIBUTOR, 0, INT_H_SIZE, dest);
}
return buf;
}
void tipc_cltr_bcast_new_route(struct cluster *c_ptr, u32 dest,
u32 lower, u32 upper)
{
struct sk_buff *buf = tipc_cltr_prepare_routing_msg(0, c_ptr->addr);
struct tipc_msg *msg;
if (buf) {
msg = buf_msg(buf);
msg_set_remote_node(msg, dest);
msg_set_type(msg, ROUTE_ADDITION);
tipc_cltr_multicast(c_ptr, buf, lower, upper);
} else {
warn("Memory squeeze: broadcast of new route failed\n");
}
}
void tipc_cltr_bcast_lost_route(struct cluster *c_ptr, u32 dest,
u32 lower, u32 upper)
{
struct sk_buff *buf = tipc_cltr_prepare_routing_msg(0, c_ptr->addr);
struct tipc_msg *msg;
if (buf) {
msg = buf_msg(buf);
msg_set_remote_node(msg, dest);
msg_set_type(msg, ROUTE_REMOVAL);
tipc_cltr_multicast(c_ptr, buf, lower, upper);
} else {
warn("Memory squeeze: broadcast of lost route failed\n");
}
}
void tipc_cltr_send_slave_routes(struct cluster *c_ptr, u32 dest)
{
struct sk_buff *buf;
struct tipc_msg *msg;
u32 highest = c_ptr->highest_slave;
u32 n_num;
int send = 0;
assert(!is_slave(dest));
assert(in_own_cluster(dest));
assert(in_own_cluster(c_ptr->addr));
if (highest <= LOWEST_SLAVE)
return;
buf = tipc_cltr_prepare_routing_msg(highest - LOWEST_SLAVE + 1,
c_ptr->addr);
if (buf) {
msg = buf_msg(buf);
msg_set_remote_node(msg, c_ptr->addr);
msg_set_type(msg, SLAVE_ROUTING_TABLE);
for (n_num = LOWEST_SLAVE; n_num <= highest; n_num++) {
if (c_ptr->nodes[n_num] &&
tipc_node_has_active_links(c_ptr->nodes[n_num])) {
send = 1;
msg_set_dataoctet(msg, n_num);
}
}
if (send)
tipc_link_send(buf, dest, dest);
else
buf_discard(buf);
} else {
warn("Memory squeeze: broadcast of lost route failed\n");
}
}
void tipc_cltr_send_ext_routes(struct cluster *c_ptr, u32 dest)
{
struct sk_buff *buf;
struct tipc_msg *msg;
u32 highest = c_ptr->highest_node;
u32 n_num;
int send = 0;
if (in_own_cluster(c_ptr->addr))
return;
assert(!is_slave(dest));
assert(in_own_cluster(dest));
highest = c_ptr->highest_node;
buf = tipc_cltr_prepare_routing_msg(highest + 1, c_ptr->addr);
if (buf) {
msg = buf_msg(buf);
msg_set_remote_node(msg, c_ptr->addr);
msg_set_type(msg, EXT_ROUTING_TABLE);
for (n_num = 1; n_num <= highest; n_num++) {
if (c_ptr->nodes[n_num] &&
tipc_node_has_active_links(c_ptr->nodes[n_num])) {
send = 1;
msg_set_dataoctet(msg, n_num);
}
}
if (send)
tipc_link_send(buf, dest, dest);
else
buf_discard(buf);
} else {
warn("Memory squeeze: broadcast of external route failed\n");
}
}
void tipc_cltr_send_local_routes(struct cluster *c_ptr, u32 dest)
{
struct sk_buff *buf;
struct tipc_msg *msg;
u32 highest = c_ptr->highest_node;
u32 n_num;
int send = 0;
assert(is_slave(dest));
assert(in_own_cluster(c_ptr->addr));
buf = tipc_cltr_prepare_routing_msg(highest, c_ptr->addr);
if (buf) {
msg = buf_msg(buf);
msg_set_remote_node(msg, c_ptr->addr);
msg_set_type(msg, LOCAL_ROUTING_TABLE);
for (n_num = 1; n_num <= highest; n_num++) {
if (c_ptr->nodes[n_num] &&
tipc_node_has_active_links(c_ptr->nodes[n_num])) {
send = 1;
msg_set_dataoctet(msg, n_num);
}
}
if (send)
tipc_link_send(buf, dest, dest);
else
buf_discard(buf);
} else {
warn("Memory squeeze: broadcast of local route failed\n");
}
}
void tipc_cltr_recv_routing_table(struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
struct cluster *c_ptr;
struct node *n_ptr;
unchar *node_table;
u32 table_size;
u32 router;
u32 rem_node = msg_remote_node(msg);
u32 z_num;
u32 c_num;
u32 n_num;
c_ptr = tipc_cltr_find(rem_node);
if (!c_ptr) {
c_ptr = tipc_cltr_create(rem_node);
if (!c_ptr) {
buf_discard(buf);
return;
}
}
node_table = buf->data + msg_hdr_sz(msg);
table_size = msg_size(msg) - msg_hdr_sz(msg);
router = msg_prevnode(msg);
z_num = tipc_zone(rem_node);
c_num = tipc_cluster(rem_node);
switch (msg_type(msg)) {
case LOCAL_ROUTING_TABLE:
assert(is_slave(tipc_own_addr));
case EXT_ROUTING_TABLE:
for (n_num = 1; n_num < table_size; n_num++) {
if (node_table[n_num]) {
u32 addr = tipc_addr(z_num, c_num, n_num);
n_ptr = c_ptr->nodes[n_num];
if (!n_ptr) {
n_ptr = tipc_node_create(addr);
}
if (n_ptr)
tipc_node_add_router(n_ptr, router);
}
}
break;
case SLAVE_ROUTING_TABLE:
assert(!is_slave(tipc_own_addr));
assert(in_own_cluster(c_ptr->addr));
for (n_num = 1; n_num < table_size; n_num++) {
if (node_table[n_num]) {
u32 slave_num = n_num + LOWEST_SLAVE;
u32 addr = tipc_addr(z_num, c_num, slave_num);
n_ptr = c_ptr->nodes[slave_num];
if (!n_ptr) {
n_ptr = tipc_node_create(addr);
}
if (n_ptr)
tipc_node_add_router(n_ptr, router);
}
}
break;
case ROUTE_ADDITION:
if (!is_slave(tipc_own_addr)) {
assert(!in_own_cluster(c_ptr->addr)
|| is_slave(rem_node));
} else {
assert(in_own_cluster(c_ptr->addr)
&& !is_slave(rem_node));
}
n_ptr = c_ptr->nodes[tipc_node(rem_node)];
if (!n_ptr)
n_ptr = tipc_node_create(rem_node);
if (n_ptr)
tipc_node_add_router(n_ptr, router);
break;
case ROUTE_REMOVAL:
if (!is_slave(tipc_own_addr)) {
assert(!in_own_cluster(c_ptr->addr)
|| is_slave(rem_node));
} else {
assert(in_own_cluster(c_ptr->addr)
&& !is_slave(rem_node));
}
n_ptr = c_ptr->nodes[tipc_node(rem_node)];
if (n_ptr)
tipc_node_remove_router(n_ptr, router);
break;
default:
assert(!"Illegal routing manager message received\n");
}
buf_discard(buf);
}
void tipc_cltr_remove_as_router(struct cluster *c_ptr, u32 router)
{
u32 start_entry;
u32 tstop;
u32 n_num;
if (is_slave(router))
return; /* Slave nodes can not be routers */
if (in_own_cluster(c_ptr->addr)) {
start_entry = LOWEST_SLAVE;
tstop = c_ptr->highest_slave;
} else {
start_entry = 1;
tstop = c_ptr->highest_node;
}
for (n_num = start_entry; n_num <= tstop; n_num++) {
if (c_ptr->nodes[n_num]) {
tipc_node_remove_router(c_ptr->nodes[n_num], router);
}
}
}
/**
* tipc_cltr_multicast - multicast message to local nodes
*/
static void tipc_cltr_multicast(struct cluster *c_ptr, struct sk_buff *buf,
u32 lower, u32 upper)
{
struct sk_buff *buf_copy;
struct node *n_ptr;
u32 n_num;
u32 tstop;
assert(lower <= upper);
assert(((lower >= 1) && (lower <= tipc_max_nodes)) ||
((lower >= LOWEST_SLAVE) && (lower <= tipc_highest_allowed_slave)));
assert(((upper >= 1) && (upper <= tipc_max_nodes)) ||
((upper >= LOWEST_SLAVE) && (upper <= tipc_highest_allowed_slave)));
assert(in_own_cluster(c_ptr->addr));
tstop = is_slave(upper) ? c_ptr->highest_slave : c_ptr->highest_node;
if (tstop > upper)
tstop = upper;
for (n_num = lower; n_num <= tstop; n_num++) {
n_ptr = c_ptr->nodes[n_num];
if (n_ptr && tipc_node_has_active_links(n_ptr)) {
buf_copy = skb_copy(buf, GFP_ATOMIC);
if (buf_copy == NULL)
break;
msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr);
}
}
buf_discard(buf);
}
/**
* tipc_cltr_broadcast - broadcast message to all nodes within cluster
*/
void tipc_cltr_broadcast(struct sk_buff *buf)
{
struct sk_buff *buf_copy;
struct cluster *c_ptr;
struct node *n_ptr;
u32 n_num;
u32 tstart;
u32 tstop;
u32 node_type;
if (tipc_mode == TIPC_NET_MODE) {
c_ptr = tipc_cltr_find(tipc_own_addr);
assert(in_own_cluster(c_ptr->addr)); /* For now */
/* Send to standard nodes, then repeat loop sending to slaves */
tstart = 1;
tstop = c_ptr->highest_node;
for (node_type = 1; node_type <= 2; node_type++) {
for (n_num = tstart; n_num <= tstop; n_num++) {
n_ptr = c_ptr->nodes[n_num];
if (n_ptr && tipc_node_has_active_links(n_ptr)) {
buf_copy = skb_copy(buf, GFP_ATOMIC);
if (buf_copy == NULL)
goto exit;
msg_set_destnode(buf_msg(buf_copy),
n_ptr->addr);
tipc_link_send(buf_copy, n_ptr->addr,
n_ptr->addr);
}
}
tstart = LOWEST_SLAVE;
tstop = c_ptr->highest_slave;
}
}
exit:
buf_discard(buf);
}
int tipc_cltr_init(void)
{
tipc_highest_allowed_slave = LOWEST_SLAVE + tipc_max_slaves;
return tipc_cltr_create(tipc_own_addr) ? 0 : -ENOMEM;
}
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