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linux/net/tipc/name_table.c
Allan Stephens 968edbe1c8 tipc: Optimization to multicast name lookup algorithm 
This patch simplifies and speeds up TIPC's algorithm for identifying
on-node and off-node destinations that overlap a multicast name
sequence range.  Rather than traversing the list of all known name
publications within the cluster, it now traverses the (potentially
much shorter) list of name publications made by the node itself, and
determines if any off-node destinations exist by comparing the sizes
of the two lists.  (Since the node list must be a subset of the
cluster list, a difference in sizes means that at least one off-node
destination must exist.)

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-14 22:45:33 -07:00

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/*
* net/tipc/name_table.c: TIPC name table code
*
* Copyright (c) 2000-2006, Ericsson AB
* Copyright (c) 2004-2008, 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 "config.h"
#include "dbg.h"
#include "name_table.h"
#include "name_distr.h"
#include "addr.h"
#include "node_subscr.h"
#include "subscr.h"
#include "port.h"
#include "cluster.h"
#include "bcast.h"
static int tipc_nametbl_size = 1024; /* must be a power of 2 */
/**
* struct sub_seq - container for all published instances of a name sequence
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @node_list: circular list of publications made by own node
* @cluster_list: circular list of publications made by own cluster
* @zone_list: circular list of publications made by own zone
* @node_list_size: number of entries in "node_list"
* @cluster_list_size: number of entries in "cluster_list"
* @zone_list_size: number of entries in "zone_list"
*
* Note: The zone list always contains at least one entry, since all
* publications of the associated name sequence belong to it.
* (The cluster and node lists may be empty.)
*/
struct sub_seq {
u32 lower;
u32 upper;
struct publication *node_list;
struct publication *cluster_list;
struct publication *zone_list;
u32 node_list_size;
u32 cluster_list_size;
u32 zone_list_size;
};
/**
* struct name_seq - container for all published instances of a name type
* @type: 32 bit 'type' value for name sequence
* @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
* sub-sequences are sorted in ascending order
* @alloc: number of sub-sequences currently in array
* @first_free: array index of first unused sub-sequence entry
* @ns_list: links to adjacent name sequences in hash chain
* @subscriptions: list of subscriptions for this 'type'
* @lock: spinlock controlling access to publication lists of all sub-sequences
*/
struct name_seq {
u32 type;
struct sub_seq *sseqs;
u32 alloc;
u32 first_free;
struct hlist_node ns_list;
struct list_head subscriptions;
spinlock_t lock;
};
/**
* struct name_table - table containing all existing port name publications
* @types: pointer to fixed-sized array of name sequence lists,
* accessed via hashing on 'type'; name sequence lists are *not* sorted
* @local_publ_count: number of publications issued by this node
*/
struct name_table {
struct hlist_head *types;
u32 local_publ_count;
};
static struct name_table table = { NULL } ;
static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
DEFINE_RWLOCK(tipc_nametbl_lock);
static int hash(int x)
{
return(x & (tipc_nametbl_size - 1));
}
/**
* publ_create - create a publication structure
*/
static struct publication *publ_create(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port_ref,
u32 key)
{
struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
if (publ == NULL) {
warn("Publication creation failure, no memory\n");
return NULL;
}
publ->type = type;
publ->lower = lower;
publ->upper = upper;
publ->scope = scope;
publ->node = node;
publ->ref = port_ref;
publ->key = key;
INIT_LIST_HEAD(&publ->local_list);
INIT_LIST_HEAD(&publ->pport_list);
INIT_LIST_HEAD(&publ->subscr.nodesub_list);
return publ;
}
/**
* tipc_subseq_alloc - allocate a specified number of sub-sequence structures
*/
static struct sub_seq *tipc_subseq_alloc(u32 cnt)
{
struct sub_seq *sseq = kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
return sseq;
}
/**
* tipc_nameseq_create - create a name sequence structure for the specified 'type'
*
* Allocates a single sub-sequence structure and sets it to all 0's.
*/
static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
{
struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
struct sub_seq *sseq = tipc_subseq_alloc(1);
if (!nseq || !sseq) {
warn("Name sequence creation failed, no memory\n");
kfree(nseq);
kfree(sseq);
return NULL;
}
spin_lock_init(&nseq->lock);
nseq->type = type;
nseq->sseqs = sseq;
dbg("tipc_nameseq_create(): nseq = %p, type %u, ssseqs %p, ff: %u\n",
nseq, type, nseq->sseqs, nseq->first_free);
nseq->alloc = 1;
INIT_HLIST_NODE(&nseq->ns_list);
INIT_LIST_HEAD(&nseq->subscriptions);
hlist_add_head(&nseq->ns_list, seq_head);
return nseq;
}
/**
* nameseq_find_subseq - find sub-sequence (if any) matching a name instance
*
* Very time-critical, so binary searches through sub-sequence array.
*/
static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
u32 instance)
{
struct sub_seq *sseqs = nseq->sseqs;
int low = 0;
int high = nseq->first_free - 1;
int mid;
while (low <= high) {
mid = (low + high) / 2;
if (instance < sseqs[mid].lower)
high = mid - 1;
else if (instance > sseqs[mid].upper)
low = mid + 1;
else
return &sseqs[mid];
}
return NULL;
}
/**
* nameseq_locate_subseq - determine position of name instance in sub-sequence
*
* Returns index in sub-sequence array of the entry that contains the specified
* instance value; if no entry contains that value, returns the position
* where a new entry for it would be inserted in the array.
*
* Note: Similar to binary search code for locating a sub-sequence.
*/
static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
{
struct sub_seq *sseqs = nseq->sseqs;
int low = 0;
int high = nseq->first_free - 1;
int mid;
while (low <= high) {
mid = (low + high) / 2;
if (instance < sseqs[mid].lower)
high = mid - 1;
else if (instance > sseqs[mid].upper)
low = mid + 1;
else
return mid;
}
return low;
}
/**
* tipc_nameseq_insert_publ -
*/
static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port, u32 key)
{
struct subscription *s;
struct subscription *st;
struct publication *publ;
struct sub_seq *sseq;
int created_subseq = 0;
sseq = nameseq_find_subseq(nseq, lower);
dbg("nameseq_ins: for seq %p, {%u,%u}, found sseq %p\n",
nseq, type, lower, sseq);
if (sseq) {
/* Lower end overlaps existing entry => need an exact match */
if ((sseq->lower != lower) || (sseq->upper != upper)) {
warn("Cannot publish {%u,%u,%u}, overlap error\n",
type, lower, upper);
return NULL;
}
} else {
u32 inspos;
struct sub_seq *freesseq;
/* Find where lower end should be inserted */
inspos = nameseq_locate_subseq(nseq, lower);
/* Fail if upper end overlaps into an existing entry */
if ((inspos < nseq->first_free) &&
(upper >= nseq->sseqs[inspos].lower)) {
warn("Cannot publish {%u,%u,%u}, overlap error\n",
type, lower, upper);
return NULL;
}
/* Ensure there is space for new sub-sequence */
if (nseq->first_free == nseq->alloc) {
struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
if (!sseqs) {
warn("Cannot publish {%u,%u,%u}, no memory\n",
type, lower, upper);
return NULL;
}
dbg("Allocated %u more sseqs\n", nseq->alloc);
memcpy(sseqs, nseq->sseqs,
nseq->alloc * sizeof(struct sub_seq));
kfree(nseq->sseqs);
nseq->sseqs = sseqs;
nseq->alloc *= 2;
}
dbg("Have %u sseqs for type %u\n", nseq->alloc, type);
/* Insert new sub-sequence */
dbg("ins in pos %u, ff = %u\n", inspos, nseq->first_free);
sseq = &nseq->sseqs[inspos];
freesseq = &nseq->sseqs[nseq->first_free];
memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof (*sseq));
memset(sseq, 0, sizeof (*sseq));
nseq->first_free++;
sseq->lower = lower;
sseq->upper = upper;
created_subseq = 1;
}
dbg("inserting {%u,%u,%u} from <0x%x:%u> into sseq %p(%u,%u) of seq %p\n",
type, lower, upper, node, port, sseq,
sseq->lower, sseq->upper, nseq);
/* Insert a publication: */
publ = publ_create(type, lower, upper, scope, node, port, key);
if (!publ)
return NULL;
dbg("inserting publ %p, node=0x%x publ->node=0x%x, subscr->node=%p\n",
publ, node, publ->node, publ->subscr.node);
sseq->zone_list_size++;
if (!sseq->zone_list)
sseq->zone_list = publ->zone_list_next = publ;
else {
publ->zone_list_next = sseq->zone_list->zone_list_next;
sseq->zone_list->zone_list_next = publ;
}
if (in_own_cluster(node)) {
sseq->cluster_list_size++;
if (!sseq->cluster_list)
sseq->cluster_list = publ->cluster_list_next = publ;
else {
publ->cluster_list_next =
sseq->cluster_list->cluster_list_next;
sseq->cluster_list->cluster_list_next = publ;
}
}
if (node == tipc_own_addr) {
sseq->node_list_size++;
if (!sseq->node_list)
sseq->node_list = publ->node_list_next = publ;
else {
publ->node_list_next = sseq->node_list->node_list_next;
sseq->node_list->node_list_next = publ;
}
}
/*
* Any subscriptions waiting for notification?
*/
list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
dbg("calling report_overlap()\n");
tipc_subscr_report_overlap(s,
publ->lower,
publ->upper,
TIPC_PUBLISHED,
publ->ref,
publ->node,
created_subseq);
}
return publ;
}
/**
* tipc_nameseq_remove_publ -
*
* NOTE: There may be cases where TIPC is asked to remove a publication
* that is not in the name table. For example, if another node issues a
* publication for a name sequence that overlaps an existing name sequence
* the publication will not be recorded, which means the publication won't
* be found when the name sequence is later withdrawn by that node.
* A failed withdraw request simply returns a failure indication and lets the
* caller issue any error or warning messages associated with such a problem.
*/
static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
u32 node, u32 ref, u32 key)
{
struct publication *publ;
struct publication *curr;
struct publication *prev;
struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
struct sub_seq *free;
struct subscription *s, *st;
int removed_subseq = 0;
if (!sseq)
return NULL;
dbg("tipc_nameseq_remove_publ: seq: %p, sseq %p, {%u,%u}, key %u\n",
nseq, sseq, nseq->type, inst, key);
/* Remove publication from zone scope list */
prev = sseq->zone_list;
publ = sseq->zone_list->zone_list_next;
while ((publ->key != key) || (publ->ref != ref) ||
(publ->node && (publ->node != node))) {
prev = publ;
publ = publ->zone_list_next;
if (prev == sseq->zone_list) {
/* Prevent endless loop if publication not found */
return NULL;
}
}
if (publ != sseq->zone_list)
prev->zone_list_next = publ->zone_list_next;
else if (publ->zone_list_next != publ) {
prev->zone_list_next = publ->zone_list_next;
sseq->zone_list = publ->zone_list_next;
} else {
sseq->zone_list = NULL;
}
sseq->zone_list_size--;
/* Remove publication from cluster scope list, if present */
if (in_own_cluster(node)) {
prev = sseq->cluster_list;
curr = sseq->cluster_list->cluster_list_next;
while (curr != publ) {
prev = curr;
curr = curr->cluster_list_next;
if (prev == sseq->cluster_list) {
/* Prevent endless loop for malformed list */
err("Unable to de-list cluster publication\n"
"{%u%u}, node=0x%x, ref=%u, key=%u)\n",
publ->type, publ->lower, publ->node,
publ->ref, publ->key);
goto end_cluster;
}
}
if (publ != sseq->cluster_list)
prev->cluster_list_next = publ->cluster_list_next;
else if (publ->cluster_list_next != publ) {
prev->cluster_list_next = publ->cluster_list_next;
sseq->cluster_list = publ->cluster_list_next;
} else {
sseq->cluster_list = NULL;
}
sseq->cluster_list_size--;
}
end_cluster:
/* Remove publication from node scope list, if present */
if (node == tipc_own_addr) {
prev = sseq->node_list;
curr = sseq->node_list->node_list_next;
while (curr != publ) {
prev = curr;
curr = curr->node_list_next;
if (prev == sseq->node_list) {
/* Prevent endless loop for malformed list */
err("Unable to de-list node publication\n"
"{%u%u}, node=0x%x, ref=%u, key=%u)\n",
publ->type, publ->lower, publ->node,
publ->ref, publ->key);
goto end_node;
}
}
if (publ != sseq->node_list)
prev->node_list_next = publ->node_list_next;
else if (publ->node_list_next != publ) {
prev->node_list_next = publ->node_list_next;
sseq->node_list = publ->node_list_next;
} else {
sseq->node_list = NULL;
}
sseq->node_list_size--;
}
end_node:
/* Contract subseq list if no more publications for that subseq */
if (!sseq->zone_list) {
free = &nseq->sseqs[nseq->first_free--];
memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof (*sseq));
removed_subseq = 1;
}
/* Notify any waiting subscriptions */
list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
tipc_subscr_report_overlap(s,
publ->lower,
publ->upper,
TIPC_WITHDRAWN,
publ->ref,
publ->node,
removed_subseq);
}
return publ;
}
/**
* tipc_nameseq_subscribe: attach a subscription, and issue
* the prescribed number of events if there is any sub-
* sequence overlapping with the requested sequence
*/
static void tipc_nameseq_subscribe(struct name_seq *nseq, struct subscription *s)
{
struct sub_seq *sseq = nseq->sseqs;
list_add(&s->nameseq_list, &nseq->subscriptions);
if (!sseq)
return;
while (sseq != &nseq->sseqs[nseq->first_free]) {
struct publication *zl = sseq->zone_list;
if (zl && tipc_subscr_overlap(s,sseq->lower,sseq->upper)) {
struct publication *crs = zl;
int must_report = 1;
do {
tipc_subscr_report_overlap(s,
sseq->lower,
sseq->upper,
TIPC_PUBLISHED,
crs->ref,
crs->node,
must_report);
must_report = 0;
crs = crs->zone_list_next;
} while (crs != zl);
}
sseq++;
}
}
static struct name_seq *nametbl_find_seq(u32 type)
{
struct hlist_head *seq_head;
struct hlist_node *seq_node;
struct name_seq *ns;
dbg("find_seq %u,(%u,0x%x) table = %p, hash[type] = %u\n",
type, ntohl(type), type, table.types, hash(type));
seq_head = &table.types[hash(type)];
hlist_for_each_entry(ns, seq_node, seq_head, ns_list) {
if (ns->type == type) {
dbg("found %p\n", ns);
return ns;
}
}
return NULL;
};
struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port, u32 key)
{
struct name_seq *seq = nametbl_find_seq(type);
dbg("tipc_nametbl_insert_publ: {%u,%u,%u} found %p\n", type, lower, upper, seq);
if (lower > upper) {
warn("Failed to publish illegal {%u,%u,%u}\n",
type, lower, upper);
return NULL;
}
dbg("Publishing {%u,%u,%u} from 0x%x\n", type, lower, upper, node);
if (!seq) {
seq = tipc_nameseq_create(type, &table.types[hash(type)]);
dbg("tipc_nametbl_insert_publ: created %p\n", seq);
}
if (!seq)
return NULL;
return tipc_nameseq_insert_publ(seq, type, lower, upper,
scope, node, port, key);
}
struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
u32 node, u32 ref, u32 key)
{
struct publication *publ;
struct name_seq *seq = nametbl_find_seq(type);
if (!seq)
return NULL;
dbg("Withdrawing {%u,%u} from 0x%x\n", type, lower, node);
publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
if (!seq->first_free && list_empty(&seq->subscriptions)) {
hlist_del_init(&seq->ns_list);
kfree(seq->sseqs);
kfree(seq);
}
return publ;
}
/*
* tipc_nametbl_translate(): Translate tipc_name -> tipc_portid.
* Very time-critical.
*
* Note: on entry 'destnode' is the search domain used during translation;
* on exit it passes back the node address of the matching port (if any)
*/
u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
{
struct sub_seq *sseq;
struct publication *publ = NULL;
struct name_seq *seq;
u32 ref;
if (!in_scope(*destnode, tipc_own_addr))
return 0;
read_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (unlikely(!seq))
goto not_found;
sseq = nameseq_find_subseq(seq, instance);
if (unlikely(!sseq))
goto not_found;
spin_lock_bh(&seq->lock);
/* Closest-First Algorithm: */
if (likely(!*destnode)) {
publ = sseq->node_list;
if (publ) {
sseq->node_list = publ->node_list_next;
found:
ref = publ->ref;
*destnode = publ->node;
spin_unlock_bh(&seq->lock);
read_unlock_bh(&tipc_nametbl_lock);
return ref;
}
publ = sseq->cluster_list;
if (publ) {
sseq->cluster_list = publ->cluster_list_next;
goto found;
}
publ = sseq->zone_list;
if (publ) {
sseq->zone_list = publ->zone_list_next;
goto found;
}
}
/* Round-Robin Algorithm: */
else if (*destnode == tipc_own_addr) {
publ = sseq->node_list;
if (publ) {
sseq->node_list = publ->node_list_next;
goto found;
}
} else if (in_own_cluster(*destnode)) {
publ = sseq->cluster_list;
if (publ) {
sseq->cluster_list = publ->cluster_list_next;
goto found;
}
} else {
publ = sseq->zone_list;
if (publ) {
sseq->zone_list = publ->zone_list_next;
goto found;
}
}
spin_unlock_bh(&seq->lock);
not_found:
*destnode = 0;
read_unlock_bh(&tipc_nametbl_lock);
return 0;
}
/**
* tipc_nametbl_mc_translate - find multicast destinations
*
* Creates list of all local ports that overlap the given multicast address;
* also determines if any off-node ports overlap.
*
* Note: Publications with a scope narrower than 'limit' are ignored.
* (i.e. local node-scope publications mustn't receive messages arriving
* from another node, even if the multcast link brought it here)
*
* Returns non-zero if any off-node ports overlap
*/
int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
struct port_list *dports)
{
struct name_seq *seq;
struct sub_seq *sseq;
struct sub_seq *sseq_stop;
int res = 0;
read_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (!seq)
goto exit;
spin_lock_bh(&seq->lock);
sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
sseq_stop = seq->sseqs + seq->first_free;
for (; sseq != sseq_stop; sseq++) {
struct publication *publ;
if (sseq->lower > upper)
break;
publ = sseq->node_list;
if (publ) {
do {
if (publ->scope <= limit)
tipc_port_list_add(dports, publ->ref);
publ = publ->node_list_next;
} while (publ != sseq->node_list);
}
if (sseq->cluster_list_size != sseq->node_list_size)
res = 1;
}
spin_unlock_bh(&seq->lock);
exit:
read_unlock_bh(&tipc_nametbl_lock);
return res;
}
/**
* tipc_nametbl_publish_rsv - publish port name using a reserved name type
*/
int tipc_nametbl_publish_rsv(u32 ref, unsigned int scope,
struct tipc_name_seq const *seq)
{
int res;
atomic_inc(&rsv_publ_ok);
res = tipc_publish(ref, scope, seq);
atomic_dec(&rsv_publ_ok);
return res;
}
/**
* tipc_nametbl_publish - add name publication to network name tables
*/
struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
u32 scope, u32 port_ref, u32 key)
{
struct publication *publ;
if (table.local_publ_count >= tipc_max_publications) {
warn("Publication failed, local publication limit reached (%u)\n",
tipc_max_publications);
return NULL;
}
if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
warn("Publication failed, reserved name {%u,%u,%u}\n",
type, lower, upper);
return NULL;
}
write_lock_bh(&tipc_nametbl_lock);
table.local_publ_count++;
publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
tipc_own_addr, port_ref, key);
if (publ && (scope != TIPC_NODE_SCOPE)) {
tipc_named_publish(publ);
}
write_unlock_bh(&tipc_nametbl_lock);
return publ;
}
/**
* tipc_nametbl_withdraw - withdraw name publication from network name tables
*/
int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
{
struct publication *publ;
dbg("tipc_nametbl_withdraw: {%u,%u}, key=%u\n", type, lower, key);
write_lock_bh(&tipc_nametbl_lock);
publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
if (likely(publ)) {
table.local_publ_count--;
if (publ->scope != TIPC_NODE_SCOPE)
tipc_named_withdraw(publ);
write_unlock_bh(&tipc_nametbl_lock);
list_del_init(&publ->pport_list);
kfree(publ);
return 1;
}
write_unlock_bh(&tipc_nametbl_lock);
err("Unable to remove local publication\n"
"(type=%u, lower=%u, ref=%u, key=%u)\n",
type, lower, ref, key);
return 0;
}
/**
* tipc_nametbl_subscribe - add a subscription object to the name table
*/
void tipc_nametbl_subscribe(struct subscription *s)
{
u32 type = s->seq.type;
struct name_seq *seq;
write_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (!seq) {
seq = tipc_nameseq_create(type, &table.types[hash(type)]);
}
if (seq){
spin_lock_bh(&seq->lock);
dbg("tipc_nametbl_subscribe:found %p for {%u,%u,%u}\n",
seq, type, s->seq.lower, s->seq.upper);
tipc_nameseq_subscribe(seq, s);
spin_unlock_bh(&seq->lock);
} else {
warn("Failed to create subscription for {%u,%u,%u}\n",
s->seq.type, s->seq.lower, s->seq.upper);
}
write_unlock_bh(&tipc_nametbl_lock);
}
/**
* tipc_nametbl_unsubscribe - remove a subscription object from name table
*/
void tipc_nametbl_unsubscribe(struct subscription *s)
{
struct name_seq *seq;
write_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(s->seq.type);
if (seq != NULL){
spin_lock_bh(&seq->lock);
list_del_init(&s->nameseq_list);
spin_unlock_bh(&seq->lock);
if ((seq->first_free == 0) && list_empty(&seq->subscriptions)) {
hlist_del_init(&seq->ns_list);
kfree(seq->sseqs);
kfree(seq);
}
}
write_unlock_bh(&tipc_nametbl_lock);
}
/**
* subseq_list: print specified sub-sequence contents into the given buffer
*/
static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
u32 index)
{
char portIdStr[27];
char *scopeStr;
struct publication *publ = sseq->zone_list;
tipc_printf(buf, "%-10u %-10u ", sseq->lower, sseq->upper);
if (depth == 2 || !publ) {
tipc_printf(buf, "\n");
return;
}
do {
sprintf (portIdStr, "<%u.%u.%u:%u>",
tipc_zone(publ->node), tipc_cluster(publ->node),
tipc_node(publ->node), publ->ref);
tipc_printf(buf, "%-26s ", portIdStr);
if (depth > 3) {
if (publ->node != tipc_own_addr)
scopeStr = "";
else if (publ->scope == TIPC_NODE_SCOPE)
scopeStr = "node";
else if (publ->scope == TIPC_CLUSTER_SCOPE)
scopeStr = "cluster";
else
scopeStr = "zone";
tipc_printf(buf, "%-10u %s", publ->key, scopeStr);
}
publ = publ->zone_list_next;
if (publ == sseq->zone_list)
break;
tipc_printf(buf, "\n%33s", " ");
} while (1);
tipc_printf(buf, "\n");
}
/**
* nameseq_list: print specified name sequence contents into the given buffer
*/
static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
u32 type, u32 lowbound, u32 upbound, u32 index)
{
struct sub_seq *sseq;
char typearea[11];
if (seq->first_free == 0)
return;
sprintf(typearea, "%-10u", seq->type);
if (depth == 1) {
tipc_printf(buf, "%s\n", typearea);
return;
}
for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
tipc_printf(buf, "%s ", typearea);
spin_lock_bh(&seq->lock);
subseq_list(sseq, buf, depth, index);
spin_unlock_bh(&seq->lock);
sprintf(typearea, "%10s", " ");
}
}
}
/**
* nametbl_header - print name table header into the given buffer
*/
static void nametbl_header(struct print_buf *buf, u32 depth)
{
tipc_printf(buf, "Type ");
if (depth > 1)
tipc_printf(buf, "Lower Upper ");
if (depth > 2)
tipc_printf(buf, "Port Identity ");
if (depth > 3)
tipc_printf(buf, "Publication");
tipc_printf(buf, "\n-----------");
if (depth > 1)
tipc_printf(buf, "--------------------- ");
if (depth > 2)
tipc_printf(buf, "-------------------------- ");
if (depth > 3)
tipc_printf(buf, "------------------");
tipc_printf(buf, "\n");
}
/**
* nametbl_list - print specified name table contents into the given buffer
*/
static void nametbl_list(struct print_buf *buf, u32 depth_info,
u32 type, u32 lowbound, u32 upbound)
{
struct hlist_head *seq_head;
struct hlist_node *seq_node;
struct name_seq *seq;
int all_types;
u32 depth;
u32 i;
all_types = (depth_info & TIPC_NTQ_ALLTYPES);
depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
if (depth == 0)
return;
if (all_types) {
/* display all entries in name table to specified depth */
nametbl_header(buf, depth);
lowbound = 0;
upbound = ~0;
for (i = 0; i < tipc_nametbl_size; i++) {
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
nameseq_list(seq, buf, depth, seq->type,
lowbound, upbound, i);
}
}
} else {
/* display only the sequence that matches the specified type */
if (upbound < lowbound) {
tipc_printf(buf, "invalid name sequence specified\n");
return;
}
nametbl_header(buf, depth);
i = hash(type);
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
if (seq->type == type) {
nameseq_list(seq, buf, depth, type,
lowbound, upbound, i);
break;
}
}
}
}
#if 0
void tipc_nametbl_print(struct print_buf *buf, const char *str)
{
tipc_printf(buf, str);
read_lock_bh(&tipc_nametbl_lock);
nametbl_list(buf, 0, 0, 0, 0);
read_unlock_bh(&tipc_nametbl_lock);
}
#endif
#define MAX_NAME_TBL_QUERY 32768
struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
{
struct sk_buff *buf;
struct tipc_name_table_query *argv;
struct tlv_desc *rep_tlv;
struct print_buf b;
int str_len;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_NAME_TBL_QUERY));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
tipc_printbuf_init(&b, TLV_DATA(rep_tlv), MAX_NAME_TBL_QUERY);
argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
read_lock_bh(&tipc_nametbl_lock);
nametbl_list(&b, ntohl(argv->depth), ntohl(argv->type),
ntohl(argv->lowbound), ntohl(argv->upbound));
read_unlock_bh(&tipc_nametbl_lock);
str_len = tipc_printbuf_validate(&b);
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
#if 0
void tipc_nametbl_dump(void)
{
nametbl_list(TIPC_CONS, 0, 0, 0, 0);
}
#endif
int tipc_nametbl_init(void)
{
table.types = kcalloc(tipc_nametbl_size, sizeof(struct hlist_head),
GFP_ATOMIC);
if (!table.types)
return -ENOMEM;
table.local_publ_count = 0;
return 0;
}
void tipc_nametbl_stop(void)
{
u32 i;
if (!table.types)
return;
/* Verify name table is empty, then release it */
write_lock_bh(&tipc_nametbl_lock);
for (i = 0; i < tipc_nametbl_size; i++) {
if (!hlist_empty(&table.types[i]))
err("tipc_nametbl_stop(): hash chain %u is non-null\n", i);
}
kfree(table.types);
table.types = NULL;
write_unlock_bh(&tipc_nametbl_lock);
}
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