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tipc: Add support for customized subscription endianness 

This patch enables TIPC's topology server code to do customized
endianness conversions on a per-subscription basis.  (This
capability is needed to support the upcoming consolidation of
subscriber and subscription object references.)

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2008-05-19 13:28:32 -07:00 committed by David S. Miller
parent e15f880409
commit 8e9501f518
2 changed files with 18 additions and 19 deletions
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35
net/tipc/subscr.c
View File

@ -47,7 +47,6 @@
* @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 {
@ -56,7 +55,6 @@ struct subscriber {
struct list_head subscriber_list;
struct list_head subscription_list;
u32 port_ref;
int swap;
};
/**
@ -109,11 +107,11 @@ static void subscr_send_event(struct subscription *sub,
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);
sub->evt.event = htohl(event, sub->swap);
sub->evt.found_lower = htohl(found_lower, sub->swap);
sub->evt.found_upper = htohl(found_upper, sub->swap);
sub->evt.port.ref = htohl(port_ref, sub->swap);
sub->evt.port.node = htohl(node, sub->swap);
tipc_send(sub->owner->port_ref, 1, &msg_sect);
}
@ -324,18 +322,16 @@ static void subscr_subscribe(struct tipc_subscr *s,
struct subscriber *subscriber)
{
struct subscription *sub;
int swap;
/* Determine/update subscriber's endianness */
/* Determine subscriber's endianness */
if (s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE))
subscriber->swap = 0;
else
subscriber->swap = 1;
swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
/* Detect & process a subscription cancellation request */
if (s->filter & htohl(TIPC_SUB_CANCEL, subscriber->swap)) {
s->filter &= ~htohl(TIPC_SUB_CANCEL, subscriber->swap);
if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
subscr_cancel(s, subscriber);
return;
}
@ -360,11 +356,11 @@ static void subscr_subscribe(struct tipc_subscr *s,
/* Initialize subscription object */
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);
sub->seq.type = htohl(s->seq.type, swap);
sub->seq.lower = htohl(s->seq.lower, swap);
sub->seq.upper = htohl(s->seq.upper, swap);
sub->timeout = htohl(s->timeout, swap);
sub->filter = htohl(s->filter, swap);
if ((!(sub->filter & TIPC_SUB_PORTS)
== !(sub->filter & TIPC_SUB_SERVICE))
|| (sub->seq.lower > sub->seq.upper)) {
@ -378,6 +374,7 @@ static void subscr_subscribe(struct tipc_subscr *s,
INIT_LIST_HEAD(&sub->subscription_list);
INIT_LIST_HEAD(&sub->nameseq_list);
list_add(&sub->subscription_list, &subscriber->subscription_list);
sub->swap = swap;
atomic_inc(&topsrv.subscription_count);
if (sub->timeout != TIPC_WAIT_FOREVER) {
k_init_timer(&sub->timer,

2
net/tipc/subscr.h
View File

@ -49,6 +49,7 @@ typedef void (*tipc_subscr_event) (struct subscription *sub,
* @timeout: duration of subscription (in ms)
* @filter: event filtering to be done for subscription
* @event_cb: routine invoked when a subscription event is detected
* @swap: indicates if subscriber uses opposite endianness in its messages
* @evt: template for events generated by subscription
* @subscription_list: adjacent subscriptions in subscriber's subscription list
* @nameseq_list: adjacent subscriptions in name sequence's subscription list
@ -61,6 +62,7 @@ struct subscription {
u32 timeout;
u32 filter;
tipc_subscr_event event_cb;
int swap;
struct tipc_event evt;
struct list_head subscription_list;
struct list_head nameseq_list;