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mirror of https://git.FreeBSD.org/src.git synced 2024-12-17 10:26:15 +00:00

Instead of direct manipulation on queue and worklist mutexes, bring macros

for doing this job. This change will make it easy to migrate from using
spinning locks to adaptive ones.

Reviewed by:	glebius, julian
Approved by:	cognet (mentor)
This commit is contained in:
Wojciech A. Koszek 2007-03-30 14:34:34 +00:00
parent 1b692a8c44
commit 2c8dda8d55
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=168049

View File

@ -228,6 +228,19 @@ MALLOC_DEFINE(M_NETGRAPH_MSG, "netgraph_msg", "netgraph name storage");
#define _NG_ALLOC_NODE(node) \
MALLOC(node, node_p, sizeof(*node), M_NETGRAPH_NODE, M_NOWAIT | M_ZERO)
#define NG_QUEUE_LOCK_INIT(n) \
mtx_init(&(n)->q_mtx, "ng_node", NULL, MTX_SPIN)
#define NG_QUEUE_LOCK(n) \
mtx_lock_spin(&(n)->q_mtx)
#define NG_QUEUE_UNLOCK(n) \
mtx_unlock_spin(&(n)->q_mtx)
#define NG_WORKLIST_LOCK_INIT() \
mtx_init(&ng_worklist_mtx, "ng_worklist", NULL, MTX_SPIN)
#define NG_WORKLIST_LOCK() \
mtx_lock_spin(&ng_worklist_mtx)
#define NG_WORKLIST_UNLOCK() \
mtx_unlock_spin(&ng_worklist_mtx)
#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
/*
* In debug mode:
@ -605,7 +618,7 @@ ng_make_node_common(struct ng_type *type, node_p *nodepp)
NG_NODE_REF(node); /* note reference */
type->refs++;
mtx_init(&node->nd_input_queue.q_mtx, "ng_node", NULL, MTX_SPIN);
NG_QUEUE_LOCK_INIT(&node->nd_input_queue);
node->nd_input_queue.queue = NULL;
node->nd_input_queue.last = &node->nd_input_queue.queue;
node->nd_input_queue.q_flags = 0;
@ -2039,7 +2052,7 @@ ng_acquire_read(struct ng_queue *ngq, item_p item)
atomic_subtract_long(&ngq->q_flags, READER_INCREMENT);
/* ######### End Hack alert ######### */
mtx_lock_spin((&ngq->q_mtx));
NG_QUEUE_LOCK(ngq);
/*
* Try again. Another processor (or interrupt for that matter) may
* have removed the last queued item that was stopping us from
@ -2050,7 +2063,7 @@ ng_acquire_read(struct ng_queue *ngq, item_p item)
*/
if ((ngq->q_flags & NGQ_RMASK) == 0) {
atomic_add_long(&ngq->q_flags, READER_INCREMENT);
mtx_unlock_spin((&ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
CTR4(KTR_NET, "%20s: node [%x] (%p) slow acquired item %p",
__func__, ngq->q_node->nd_ID, ngq->q_node, item);
return (item);
@ -2060,7 +2073,7 @@ ng_acquire_read(struct ng_queue *ngq, item_p item)
* and queue the request for later.
*/
ng_queue_rw(ngq, item, NGQRW_R);
mtx_unlock_spin(&(ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
return (NULL);
}
@ -2072,7 +2085,7 @@ ng_acquire_write(struct ng_queue *ngq, item_p item)
("%s: working on deadnode", __func__));
restart:
mtx_lock_spin(&(ngq->q_mtx));
NG_QUEUE_LOCK(ngq);
/*
* If there are no readers, no writer, and no pending packets, then
* we can just go ahead. In all other situations we need to queue the
@ -2081,7 +2094,7 @@ ng_acquire_write(struct ng_queue *ngq, item_p item)
if ((ngq->q_flags & NGQ_WMASK) == 0) {
/* collision could happen *HERE* */
atomic_add_long(&ngq->q_flags, WRITER_ACTIVE);
mtx_unlock_spin((&ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
if (ngq->q_flags & READER_MASK) {
/* Collision with fast-track reader */
atomic_subtract_long(&ngq->q_flags, WRITER_ACTIVE);
@ -2096,7 +2109,7 @@ ng_acquire_write(struct ng_queue *ngq, item_p item)
* and queue the request for later.
*/
ng_queue_rw(ngq, item, NGQRW_W);
mtx_unlock_spin(&(ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
return (NULL);
}
@ -2192,7 +2205,7 @@ ng_flush_input_queue(struct ng_queue * ngq)
{
item_p item;
mtx_lock_spin(&ngq->q_mtx);
NG_QUEUE_LOCK(ngq);
while (ngq->queue) {
item = ngq->queue;
ngq->queue = item->el_next;
@ -2200,7 +2213,7 @@ ng_flush_input_queue(struct ng_queue * ngq)
ngq->last = &(ngq->queue);
atomic_add_long(&ngq->q_flags, -OP_PENDING);
}
mtx_unlock_spin(&ngq->q_mtx);
NG_QUEUE_UNLOCK(ngq);
/* If the item is supplying a callback, call it with an error */
if (item->apply != NULL) {
@ -2208,14 +2221,14 @@ ng_flush_input_queue(struct ng_queue * ngq)
item->apply = NULL;
}
NG_FREE_ITEM(item);
mtx_lock_spin(&ngq->q_mtx);
NG_QUEUE_LOCK(ngq);
}
/*
* Take us off the work queue if we are there.
* We definately have no work to be done.
*/
ng_worklist_remove(ngq->q_node);
mtx_unlock_spin(&ngq->q_mtx);
NG_QUEUE_UNLOCK(ngq);
}
/***********************************************************************
@ -2339,9 +2352,9 @@ ng_snd_item(item_p item, int flags)
#ifdef NETGRAPH_DEBUG
_ngi_check(item, __FILE__, __LINE__);
#endif
mtx_lock_spin(&(ngq->q_mtx));
NG_QUEUE_LOCK(ngq);
ng_queue_rw(ngq, item, rw);
mtx_unlock_spin(&(ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
if (flags & NG_PROGRESS)
return (EINPROGRESS);
@ -2384,10 +2397,10 @@ ng_snd_item(item_p item, int flags)
return (error);
}
mtx_lock_spin(&(ngq->q_mtx));
NG_QUEUE_LOCK(ngq);
if (NEXT_QUEUED_ITEM_CAN_PROCEED(ngq))
ng_setisr(ngq->q_node);
mtx_unlock_spin(&(ngq->q_mtx));
NG_QUEUE_UNLOCK(ngq);
return (error);
}
@ -3140,7 +3153,7 @@ ngb_mod_event(module_t mod, int event, void *data)
switch (event) {
case MOD_LOAD:
/* Initialize everything. */
mtx_init(&ng_worklist_mtx, "ng_worklist", NULL, MTX_SPIN);
NG_WORKLIST_LOCK_INIT();
mtx_init(&ng_typelist_mtx, "netgraph types mutex", NULL,
MTX_DEF);
mtx_init(&ng_nodelist_mtx, "netgraph nodelist mutex", NULL,
@ -3318,15 +3331,15 @@ ngintr(void)
node_p node = NULL;
for (;;) {
mtx_lock_spin(&ng_worklist_mtx);
NG_WORKLIST_LOCK();
node = TAILQ_FIRST(&ng_worklist);
if (!node) {
mtx_unlock_spin(&ng_worklist_mtx);
NG_WORKLIST_UNLOCK();
break;
}
node->nd_flags &= ~NGF_WORKQ;
TAILQ_REMOVE(&ng_worklist, node, nd_work);
mtx_unlock_spin(&ng_worklist_mtx);
NG_WORKLIST_UNLOCK();
CTR3(KTR_NET, "%20s: node [%x] (%p) taken off worklist",
__func__, node->nd_ID, node);
/*
@ -3345,13 +3358,13 @@ ngintr(void)
for (;;) {
int rw;
mtx_lock_spin(&node->nd_input_queue.q_mtx);
NG_QUEUE_LOCK(&node->nd_input_queue);
item = ng_dequeue(&node->nd_input_queue, &rw);
if (item == NULL) {
mtx_unlock_spin(&node->nd_input_queue.q_mtx);
NG_QUEUE_UNLOCK(&node->nd_input_queue);
break; /* go look for another node */
} else {
mtx_unlock_spin(&node->nd_input_queue.q_mtx);
NG_QUEUE_UNLOCK(&node->nd_input_queue);
NGI_GET_NODE(item, node); /* zaps stored node */
ng_apply_item(node, item, rw);
NG_NODE_UNREF(node);
@ -3366,16 +3379,16 @@ ng_worklist_remove(node_p node)
{
mtx_assert(&node->nd_input_queue.q_mtx, MA_OWNED);
mtx_lock_spin(&ng_worklist_mtx);
NG_WORKLIST_LOCK();
if (node->nd_flags & NGF_WORKQ) {
node->nd_flags &= ~NGF_WORKQ;
TAILQ_REMOVE(&ng_worklist, node, nd_work);
mtx_unlock_spin(&ng_worklist_mtx);
NG_WORKLIST_UNLOCK();
NG_NODE_UNREF(node);
CTR3(KTR_NET, "%20s: node [%x] (%p) removed from worklist",
__func__, node->nd_ID, node);
} else {
mtx_unlock_spin(&ng_worklist_mtx);
NG_WORKLIST_UNLOCK();
}
}
@ -3396,9 +3409,9 @@ ng_setisr(node_p node)
* then put us on.
*/
node->nd_flags |= NGF_WORKQ;
mtx_lock_spin(&ng_worklist_mtx);
NG_WORKLIST_LOCK();
TAILQ_INSERT_TAIL(&ng_worklist, node, nd_work);
mtx_unlock_spin(&ng_worklist_mtx);
NG_WORKLIST_UNLOCK();
NG_NODE_REF(node); /* XXX fafe in mutex? */
CTR3(KTR_NET, "%20s: node [%x] (%p) put on worklist", __func__,
node->nd_ID, node);