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IB/ipath: simplify IB timer usage

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Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bryan O'Sullivan 2006-04-24 14:23:06 -07:00 committed by Roland Dreier
parent 76f0dd141b
commit 9b2017f1e1
2 changed files with 12 additions and 30 deletions
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39
drivers/infiniband/hw/ipath/ipath_verbs.c
View file

@ -449,7 +449,6 @@ static void ipath_ib_timer(void *arg)
{
struct ipath_ibdev *dev = (struct ipath_ibdev *) arg;
struct ipath_qp *resend = NULL;
struct ipath_qp *rnr = NULL;
struct list_head *last;
struct ipath_qp *qp;
unsigned long flags;
@ -465,32 +464,18 @@ static void ipath_ib_timer(void *arg)
last = &dev->pending[dev->pending_index];
while (!list_empty(last)) {
qp = list_entry(last->next, struct ipath_qp, timerwait);
if (last->next == LIST_POISON1 ||
last->next != &qp->timerwait ||
qp->timerwait.prev != last) {
INIT_LIST_HEAD(last);
} else {
list_del(&qp->timerwait);
qp->timerwait.prev = (struct list_head *) resend;
resend = qp;
atomic_inc(&qp->refcount);
}
list_del(&qp->timerwait);
qp->timer_next = resend;
resend = qp;
atomic_inc(&qp->refcount);
}
last = &dev->rnrwait;
if (!list_empty(last)) {
qp = list_entry(last->next, struct ipath_qp, timerwait);
if (--qp->s_rnr_timeout == 0) {
do {
if (last->next == LIST_POISON1 ||
last->next != &qp->timerwait ||
qp->timerwait.prev != last) {
INIT_LIST_HEAD(last);
break;
}
list_del(&qp->timerwait);
qp->timerwait.prev =
(struct list_head *) rnr;
rnr = qp;
tasklet_hi_schedule(&qp->s_task);
if (list_empty(last))
break;
qp = list_entry(last->next, struct ipath_qp,
@ -530,8 +515,7 @@ static void ipath_ib_timer(void *arg)
spin_unlock_irqrestore(&dev->pending_lock, flags);
/* XXX What if timer fires again while this is running? */
for (qp = resend; qp != NULL;
qp = (struct ipath_qp *) qp->timerwait.prev) {
for (qp = resend; qp != NULL; qp = qp->timer_next) {
struct ib_wc wc;
spin_lock_irqsave(&qp->s_lock, flags);
@ -545,9 +529,6 @@ static void ipath_ib_timer(void *arg)
if (atomic_dec_and_test(&qp->refcount))
wake_up(&qp->wait);
}
for (qp = rnr; qp != NULL;
qp = (struct ipath_qp *) qp->timerwait.prev)
tasklet_hi_schedule(&qp->s_task);
}
/**
@ -556,9 +537,9 @@ static void ipath_ib_timer(void *arg)
*
* This is called from ipath_intr() at interrupt level when a PIO buffer is
* available after ipath_verbs_send() returned an error that no buffers were
* available. Return 0 if we consumed all the PIO buffers and we still have
* available. Return 1 if we consumed all the PIO buffers and we still have
* QPs waiting for buffers (for now, just do a tasklet_hi_schedule and
* return one).
* return zero).
*/
static int ipath_ib_piobufavail(void *arg)
{
@ -579,7 +560,7 @@ static int ipath_ib_piobufavail(void *arg)
spin_unlock_irqrestore(&dev->pending_lock, flags);
bail:
return 1;
return 0;
}
static int ipath_query_device(struct ib_device *ibdev,
@ -1159,7 +1140,7 @@ static ssize_t show_stats(struct class_device *cdev, char *buf)
len = sprintf(buf,
"RC resends %d\n"
"RC QACKs %d\n"
"RC no QACK %d\n"
"RC ACKs %d\n"
"RC SEQ NAKs %d\n"
"RC RDMA seq %d\n"

3
drivers/infiniband/hw/ipath/ipath_verbs.h
View file

@ -282,7 +282,8 @@ struct ipath_srq {
*/
struct ipath_qp {
struct ib_qp ibqp;
struct ipath_qp *next; /* link list for QPN hash table */
struct ipath_qp *next; /* link list for QPN hash table */
struct ipath_qp *timer_next; /* link list for ipath_ib_timer() */
struct list_head piowait; /* link for wait PIO buf */
struct list_head timerwait; /* link for waiting for timeouts */
struct ib_ah_attr remote_ah_attr;