linux/net/tipc/subscr.c
Sam Ravnborg 05790c6456 [TIPC]: Remove inlines from *.c
With reference to latest discussions on linux-kernel with respect to
inline here is a patch for tipc to remove all inlines as used in
the .c files. See also chapter 14 in Documentation/CodingStyle.

Before:
   text        data     bss     dec     hex filename
 102990        5292    1752  110034   1add2 tipc.o

Now:
   text        data     bss     dec     hex filename
 101190        5292    1752  108234   1a6ca tipc.o

This is a nice text size reduction which will improve icache usage.
In some cases bigger (> 4 lines) functions where declared inline
and used in many places, they are most probarly no longer inlined by gcc
resulting in the size reduction.
There are several one liners that no longer are declared inline, but gcc
should inline these just fine without the inline hint.

With this patch applied one warning is added about an unused static
function - that was hidded by utilising inline before.
The function in question were kept so this patch is solely a
inline removal patch.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 22:37:04 -08:00

527 lines
14 KiB
C

/*
* net/tipc/subscr.c: TIPC subscription service
*
* 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 "dbg.h"
#include "subscr.h"
#include "name_table.h"
#include "ref.h"
/**
* struct subscriber - TIPC network topology subscriber
* @ref: object reference to subscriber object itself
* @lock: pointer to spinlock controlling access to subscriber object
* @subscriber_list: adjacent subscribers in top. server's list of subscribers
* @subscription_list: list of subscription objects for this subscriber
* @port_ref: object reference to port used to communicate with subscriber
* @swap: indicates if subscriber uses opposite endianness in its messages
*/
struct subscriber {
u32 ref;
spinlock_t *lock;
struct list_head subscriber_list;
struct list_head subscription_list;
u32 port_ref;
int swap;
};
/**
* struct top_srv - TIPC network topology subscription service
* @user_ref: TIPC userid of subscription service
* @setup_port: reference to TIPC port that handles subscription requests
* @subscription_count: number of active subscriptions (not subscribers!)
* @subscriber_list: list of ports subscribing to service
* @lock: spinlock govering access to subscriber list
*/
struct top_srv {
u32 user_ref;
u32 setup_port;
atomic_t subscription_count;
struct list_head subscriber_list;
spinlock_t lock;
};
static struct top_srv topsrv = { 0 };
/**
* htohl - convert value to endianness used by destination
* @in: value to convert
* @swap: non-zero if endianness must be reversed
*
* Returns converted value
*/
static u32 htohl(u32 in, int swap)
{
char *c = (char *)&in;
return swap ? ((c[3] << 3) + (c[2] << 2) + (c[1] << 1) + c[0]) : in;
}
/**
* subscr_send_event - send a message containing a tipc_event to the subscriber
*/
static void subscr_send_event(struct subscription *sub,
u32 found_lower,
u32 found_upper,
u32 event,
u32 port_ref,
u32 node)
{
struct iovec msg_sect;
msg_sect.iov_base = (void *)&sub->evt;
msg_sect.iov_len = sizeof(struct tipc_event);
sub->evt.event = htohl(event, sub->owner->swap);
sub->evt.found_lower = htohl(found_lower, sub->owner->swap);
sub->evt.found_upper = htohl(found_upper, sub->owner->swap);
sub->evt.port.ref = htohl(port_ref, sub->owner->swap);
sub->evt.port.node = htohl(node, sub->owner->swap);
tipc_send(sub->owner->port_ref, 1, &msg_sect);
}
/**
* tipc_subscr_overlap - test for subscription overlap with the given values
*
* Returns 1 if there is overlap, otherwise 0.
*/
int tipc_subscr_overlap(struct subscription *sub,
u32 found_lower,
u32 found_upper)
{
if (found_lower < sub->seq.lower)
found_lower = sub->seq.lower;
if (found_upper > sub->seq.upper)
found_upper = sub->seq.upper;
if (found_lower > found_upper)
return 0;
return 1;
}
/**
* tipc_subscr_report_overlap - issue event if there is subscription overlap
*
* Protected by nameseq.lock in name_table.c
*/
void tipc_subscr_report_overlap(struct subscription *sub,
u32 found_lower,
u32 found_upper,
u32 event,
u32 port_ref,
u32 node,
int must)
{
dbg("Rep overlap %u:%u,%u<->%u,%u\n", sub->seq.type, sub->seq.lower,
sub->seq.upper, found_lower, found_upper);
if (!tipc_subscr_overlap(sub, found_lower, found_upper))
return;
if (!must && (sub->filter != TIPC_SUB_PORTS))
return;
subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
}
/**
* subscr_timeout - subscription timeout has occurred
*/
static void subscr_timeout(struct subscription *sub)
{
struct subscriber *subscriber;
u32 subscriber_ref;
/* Validate subscriber reference (in case subscriber is terminating) */
subscriber_ref = sub->owner->ref;
subscriber = (struct subscriber *)tipc_ref_lock(subscriber_ref);
if (subscriber == NULL)
return;
/* Unlink subscription from name table */
tipc_nametbl_unsubscribe(sub);
/* Notify subscriber of timeout, then unlink subscription */
subscr_send_event(sub,
sub->evt.s.seq.lower,
sub->evt.s.seq.upper,
TIPC_SUBSCR_TIMEOUT,
0,
0);
list_del(&sub->subscription_list);
/* Now destroy subscription */
tipc_ref_unlock(subscriber_ref);
k_term_timer(&sub->timer);
kfree(sub);
atomic_dec(&topsrv.subscription_count);
}
/**
* subscr_terminate - terminate communication with a subscriber
*
* Called with subscriber locked. Routine must temporarily release this lock
* to enable subscription timeout routine(s) to finish without deadlocking;
* the lock is then reclaimed to allow caller to release it upon return.
* (This should work even in the unlikely event some other thread creates
* a new object reference in the interim that uses this lock; this routine will
* simply wait for it to be released, then claim it.)
*/
static void subscr_terminate(struct subscriber *subscriber)
{
struct subscription *sub;
struct subscription *sub_temp;
/* Invalidate subscriber reference */
tipc_ref_discard(subscriber->ref);
spin_unlock_bh(subscriber->lock);
/* Destroy any existing subscriptions for subscriber */
list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
subscription_list) {
if (sub->timeout != TIPC_WAIT_FOREVER) {
k_cancel_timer(&sub->timer);
k_term_timer(&sub->timer);
}
tipc_nametbl_unsubscribe(sub);
list_del(&sub->subscription_list);
dbg("Term: Removed sub %u,%u,%u from subscriber %x list\n",
sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
kfree(sub);
atomic_dec(&topsrv.subscription_count);
}
/* Sever connection to subscriber */
tipc_shutdown(subscriber->port_ref);
tipc_deleteport(subscriber->port_ref);
/* Remove subscriber from topology server's subscriber list */
spin_lock_bh(&topsrv.lock);
list_del(&subscriber->subscriber_list);
spin_unlock_bh(&topsrv.lock);
/* Now destroy subscriber */
spin_lock_bh(subscriber->lock);
kfree(subscriber);
}
/**
* subscr_subscribe - create subscription for subscriber
*
* Called with subscriber locked
*/
static void subscr_subscribe(struct tipc_subscr *s,
struct subscriber *subscriber)
{
struct subscription *sub;
/* Refuse subscription if global limit exceeded */
if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
warn("Failed: max %u subscriptions\n", tipc_max_subscriptions);
subscr_terminate(subscriber);
return;
}
/* Allocate subscription object */
sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
if (sub == NULL) {
warn("Memory squeeze; ignoring subscription\n");
subscr_terminate(subscriber);
return;
}
/* Determine/update subscriber's endianness */
if ((s->filter == TIPC_SUB_PORTS) || (s->filter == TIPC_SUB_SERVICE))
subscriber->swap = 0;
else
subscriber->swap = 1;
/* Initialize subscription object */
memset(sub, 0, sizeof(*sub));
sub->seq.type = htohl(s->seq.type, subscriber->swap);
sub->seq.lower = htohl(s->seq.lower, subscriber->swap);
sub->seq.upper = htohl(s->seq.upper, subscriber->swap);
sub->timeout = htohl(s->timeout, subscriber->swap);
sub->filter = htohl(s->filter, subscriber->swap);
if ((((sub->filter != TIPC_SUB_PORTS)
&& (sub->filter != TIPC_SUB_SERVICE)))
|| (sub->seq.lower > sub->seq.upper)) {
warn("Rejecting illegal subscription %u,%u,%u\n",
sub->seq.type, sub->seq.lower, sub->seq.upper);
kfree(sub);
subscr_terminate(subscriber);
return;
}
memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
INIT_LIST_HEAD(&sub->subscription_list);
INIT_LIST_HEAD(&sub->nameseq_list);
list_add(&sub->subscription_list, &subscriber->subscription_list);
atomic_inc(&topsrv.subscription_count);
if (sub->timeout != TIPC_WAIT_FOREVER) {
k_init_timer(&sub->timer,
(Handler)subscr_timeout, (unsigned long)sub);
k_start_timer(&sub->timer, sub->timeout);
}
sub->owner = subscriber;
tipc_nametbl_subscribe(sub);
}
/**
* subscr_conn_shutdown_event - handle termination request from subscriber
*/
static void subscr_conn_shutdown_event(void *usr_handle,
u32 portref,
struct sk_buff **buf,
unsigned char const *data,
unsigned int size,
int reason)
{
struct subscriber *subscriber;
spinlock_t *subscriber_lock;
subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle);
if (subscriber == NULL)
return;
subscriber_lock = subscriber->lock;
subscr_terminate(subscriber);
spin_unlock_bh(subscriber_lock);
}
/**
* subscr_conn_msg_event - handle new subscription request from subscriber
*/
static void subscr_conn_msg_event(void *usr_handle,
u32 port_ref,
struct sk_buff **buf,
const unchar *data,
u32 size)
{
struct subscriber *subscriber;
spinlock_t *subscriber_lock;
subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle);
if (subscriber == NULL)
return;
subscriber_lock = subscriber->lock;
if (size != sizeof(struct tipc_subscr))
subscr_terminate(subscriber);
else
subscr_subscribe((struct tipc_subscr *)data, subscriber);
spin_unlock_bh(subscriber_lock);
}
/**
* subscr_named_msg_event - handle request to establish a new subscriber
*/
static void subscr_named_msg_event(void *usr_handle,
u32 port_ref,
struct sk_buff **buf,
const unchar *data,
u32 size,
u32 importance,
struct tipc_portid const *orig,
struct tipc_name_seq const *dest)
{
struct subscriber *subscriber;
struct iovec msg_sect = {NULL, 0};
spinlock_t *subscriber_lock;
dbg("subscr_named_msg_event: orig = %x own = %x,\n",
orig->node, tipc_own_addr);
if (size && (size != sizeof(struct tipc_subscr))) {
warn("Received tipc_subscr of invalid size\n");
return;
}
/* Create subscriber object */
subscriber = kmalloc(sizeof(struct subscriber), GFP_ATOMIC);
if (subscriber == NULL) {
warn("Memory squeeze; ignoring subscriber setup\n");
return;
}
memset(subscriber, 0, sizeof(struct subscriber));
INIT_LIST_HEAD(&subscriber->subscription_list);
INIT_LIST_HEAD(&subscriber->subscriber_list);
subscriber->ref = tipc_ref_acquire(subscriber, &subscriber->lock);
if (subscriber->ref == 0) {
warn("Failed to acquire subscriber reference\n");
kfree(subscriber);
return;
}
/* Establish a connection to subscriber */
tipc_createport(topsrv.user_ref,
(void *)(unsigned long)subscriber->ref,
importance,
NULL,
NULL,
subscr_conn_shutdown_event,
NULL,
NULL,
subscr_conn_msg_event,
NULL,
&subscriber->port_ref);
if (subscriber->port_ref == 0) {
warn("Memory squeeze; failed to create subscription port\n");
tipc_ref_discard(subscriber->ref);
kfree(subscriber);
return;
}
tipc_connect2port(subscriber->port_ref, orig);
/* Add subscriber to topology server's subscriber list */
tipc_ref_lock(subscriber->ref);
spin_lock_bh(&topsrv.lock);
list_add(&subscriber->subscriber_list, &topsrv.subscriber_list);
spin_unlock_bh(&topsrv.lock);
/*
* Subscribe now if message contains a subscription,
* otherwise send an empty response to complete connection handshaking
*/
subscriber_lock = subscriber->lock;
if (size)
subscr_subscribe((struct tipc_subscr *)data, subscriber);
else
tipc_send(subscriber->port_ref, 1, &msg_sect);
spin_unlock_bh(subscriber_lock);
}
int tipc_subscr_start(void)
{
struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV};
int res = -1;
memset(&topsrv, 0, sizeof (topsrv));
topsrv.lock = SPIN_LOCK_UNLOCKED;
INIT_LIST_HEAD(&topsrv.subscriber_list);
spin_lock_bh(&topsrv.lock);
res = tipc_attach(&topsrv.user_ref, NULL, NULL);
if (res) {
spin_unlock_bh(&topsrv.lock);
return res;
}
res = tipc_createport(topsrv.user_ref,
NULL,
TIPC_CRITICAL_IMPORTANCE,
NULL,
NULL,
NULL,
NULL,
subscr_named_msg_event,
NULL,
NULL,
&topsrv.setup_port);
if (res)
goto failed;
res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq);
if (res)
goto failed;
spin_unlock_bh(&topsrv.lock);
return 0;
failed:
err("Failed to create subscription service\n");
tipc_detach(topsrv.user_ref);
topsrv.user_ref = 0;
spin_unlock_bh(&topsrv.lock);
return res;
}
void tipc_subscr_stop(void)
{
struct subscriber *subscriber;
struct subscriber *subscriber_temp;
spinlock_t *subscriber_lock;
if (topsrv.user_ref) {
tipc_deleteport(topsrv.setup_port);
list_for_each_entry_safe(subscriber, subscriber_temp,
&topsrv.subscriber_list,
subscriber_list) {
tipc_ref_lock(subscriber->ref);
subscriber_lock = subscriber->lock;
subscr_terminate(subscriber);
spin_unlock_bh(subscriber_lock);
}
tipc_detach(topsrv.user_ref);
topsrv.user_ref = 0;
}
}
int tipc_ispublished(struct tipc_name const *name)
{
u32 domain = 0;
return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0);
}