/* SPDX-License-Identifier: BSD-3-Clause
- * Copyright(c) 2010-2014 Intel Corporation
+ * Copyright(c) 2010-2018 Intel Corporation
*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <time.h>
#include <errno.h>
#include <rte_alarm.h>
+#include <rte_cycles.h>
#include <rte_common.h>
+#include <rte_errno.h>
+#include <rte_interrupts.h>
+#include <rte_spinlock.h>
+
#include "eal_private.h"
+#include "eal_alarm_private.h"
+
+#define NS_PER_US 1000
+
+#ifdef CLOCK_MONOTONIC_RAW /* Defined in glibc bits/time.h */
+#define CLOCK_TYPE_ID CLOCK_MONOTONIC_RAW
+#else
+#define CLOCK_TYPE_ID CLOCK_MONOTONIC
+#endif
+
+struct alarm_entry {
+ LIST_ENTRY(alarm_entry) next;
+ struct rte_intr_handle handle;
+ struct timespec time;
+ rte_eal_alarm_callback cb_fn;
+ void *cb_arg;
+ volatile uint8_t executing;
+ volatile pthread_t executing_id;
+};
+
+static LIST_HEAD(alarm_list, alarm_entry) alarm_list = LIST_HEAD_INITIALIZER();
+static rte_spinlock_t alarm_list_lk = RTE_SPINLOCK_INITIALIZER;
+
+static struct rte_intr_handle intr_handle = {.fd = -1 };
+static void eal_alarm_callback(void *arg);
int
rte_eal_alarm_init(void)
{
+ intr_handle.type = RTE_INTR_HANDLE_ALARM;
+
+ /* on FreeBSD, timers don't use fd's, and their identifiers are stored
+ * in separate namespace from fd's, so using any value is OK. however,
+ * EAL interrupts handler expects fd's to be unique, so use an actual fd
+ * to guarantee unique timer identifier.
+ */
+ intr_handle.fd = open("/dev/zero", O_RDONLY);
+
+ return 0;
+}
+
+static inline int
+timespec_cmp(const struct timespec *now, const struct timespec *at)
+{
+ if (now->tv_sec < at->tv_sec)
+ return -1;
+ if (now->tv_sec > at->tv_sec)
+ return 1;
+ if (now->tv_nsec < at->tv_nsec)
+ return -1;
+ if (now->tv_nsec > at->tv_nsec)
+ return 1;
return 0;
}
+static inline uint64_t
+diff_ns(struct timespec *now, struct timespec *at)
+{
+ uint64_t now_ns, at_ns;
+
+ if (timespec_cmp(now, at) >= 0)
+ return 0;
+
+ now_ns = now->tv_sec * NS_PER_S + now->tv_nsec;
+ at_ns = at->tv_sec * NS_PER_S + at->tv_nsec;
+
+ return at_ns - now_ns;
+}
int
-rte_eal_alarm_set(uint64_t us __rte_unused,
- rte_eal_alarm_callback cb_fn __rte_unused,
- void *cb_arg __rte_unused)
+eal_alarm_get_timeout_ns(uint64_t *val)
{
- return -ENOTSUP;
+ struct alarm_entry *ap;
+ struct timespec now;
+
+ if (clock_gettime(CLOCK_TYPE_ID, &now) < 0)
+ return -1;
+
+ if (LIST_EMPTY(&alarm_list))
+ return -1;
+
+ ap = LIST_FIRST(&alarm_list);
+
+ *val = diff_ns(&now, &ap->time);
+
+ return 0;
+}
+
+static int
+unregister_current_callback(void)
+{
+ struct alarm_entry *ap;
+ int ret = 0;
+
+ if (!LIST_EMPTY(&alarm_list)) {
+ ap = LIST_FIRST(&alarm_list);
+
+ do {
+ ret = rte_intr_callback_unregister(&intr_handle,
+ eal_alarm_callback, &ap->time);
+ } while (ret == -EAGAIN);
+ }
+
+ return ret;
}
+static int
+register_first_callback(void)
+{
+ struct alarm_entry *ap;
+ int ret = 0;
+
+ if (!LIST_EMPTY(&alarm_list)) {
+ ap = LIST_FIRST(&alarm_list);
+
+ /* register a new callback */
+ ret = rte_intr_callback_register(&intr_handle,
+ eal_alarm_callback, &ap->time);
+ }
+ return ret;
+}
+
+static void
+eal_alarm_callback(void *arg __rte_unused)
+{
+ struct timespec now;
+ struct alarm_entry *ap;
+
+ rte_spinlock_lock(&alarm_list_lk);
+ ap = LIST_FIRST(&alarm_list);
+
+ if (clock_gettime(CLOCK_TYPE_ID, &now) < 0)
+ return;
+
+ while (ap != NULL && timespec_cmp(&now, &ap->time) >= 0) {
+ ap->executing = 1;
+ ap->executing_id = pthread_self();
+ rte_spinlock_unlock(&alarm_list_lk);
+
+ ap->cb_fn(ap->cb_arg);
+
+ rte_spinlock_lock(&alarm_list_lk);
+
+ LIST_REMOVE(ap, next);
+ free(ap);
+
+ ap = LIST_FIRST(&alarm_list);
+ }
+
+ /* timer has been deleted from the kqueue, so recreate it if needed */
+ register_first_callback();
+
+ rte_spinlock_unlock(&alarm_list_lk);
+}
+
+
int
-rte_eal_alarm_cancel(rte_eal_alarm_callback cb_fn __rte_unused,
- void *cb_arg __rte_unused)
+rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback cb_fn, void *cb_arg)
{
- return -ENOTSUP;
+ struct alarm_entry *ap, *new_alarm;
+ struct timespec now;
+ uint64_t ns;
+ int ret = 0;
+
+ /* check parameters, also ensure us won't cause a uint64_t overflow */
+ if (us < 1 || us > (UINT64_MAX - US_PER_S) || cb_fn == NULL)
+ return -EINVAL;
+
+ new_alarm = calloc(1, sizeof(*new_alarm));
+ if (new_alarm == NULL)
+ return -ENOMEM;
+
+ /* use current time to calculate absolute time of alarm */
+ clock_gettime(CLOCK_TYPE_ID, &now);
+
+ ns = us * NS_PER_US;
+
+ new_alarm->cb_fn = cb_fn;
+ new_alarm->cb_arg = cb_arg;
+ new_alarm->time.tv_nsec = (now.tv_nsec + ns) % NS_PER_S;
+ new_alarm->time.tv_sec = now.tv_sec + ((now.tv_nsec + ns) / NS_PER_S);
+
+ rte_spinlock_lock(&alarm_list_lk);
+
+ if (LIST_EMPTY(&alarm_list))
+ LIST_INSERT_HEAD(&alarm_list, new_alarm, next);
+ else {
+ LIST_FOREACH(ap, &alarm_list, next) {
+ if (timespec_cmp(&new_alarm->time, &ap->time) < 0) {
+ LIST_INSERT_BEFORE(ap, new_alarm, next);
+ break;
+ }
+ if (LIST_NEXT(ap, next) == NULL) {
+ LIST_INSERT_AFTER(ap, new_alarm, next);
+ break;
+ }
+ }
+ }
+
+ /* re-register first callback just in case */
+ register_first_callback();
+
+ rte_spinlock_unlock(&alarm_list_lk);
+
+ return ret;
+}
+
+int
+rte_eal_alarm_cancel(rte_eal_alarm_callback cb_fn, void *cb_arg)
+{
+ struct alarm_entry *ap, *ap_prev;
+ int count = 0;
+ int err = 0;
+ int executing;
+
+ if (!cb_fn) {
+ rte_errno = EINVAL;
+ return -1;
+ }
+
+ do {
+ executing = 0;
+ rte_spinlock_lock(&alarm_list_lk);
+ /* remove any matches at the start of the list */
+ while (1) {
+ ap = LIST_FIRST(&alarm_list);
+ if (ap == NULL)
+ break;
+ if (cb_fn != ap->cb_fn)
+ break;
+ if (cb_arg != ap->cb_arg && cb_arg != (void *) -1)
+ break;
+ if (ap->executing == 0) {
+ LIST_REMOVE(ap, next);
+ free(ap);
+ count++;
+ } else {
+ /* If calling from other context, mark that
+ * alarm is executing so loop can spin till it
+ * finish. Otherwise we are trying to cancel
+ * ourselves - mark it by EINPROGRESS.
+ */
+ if (pthread_equal(ap->executing_id,
+ pthread_self()) == 0)
+ executing++;
+ else
+ err = EINPROGRESS;
+
+ break;
+ }
+ }
+ ap_prev = ap;
+
+ /* now go through list, removing entries not at start */
+ LIST_FOREACH(ap, &alarm_list, next) {
+ /* this won't be true first time through */
+ if (cb_fn == ap->cb_fn &&
+ (cb_arg == (void *)-1 ||
+ cb_arg == ap->cb_arg)) {
+ if (ap->executing == 0) {
+ LIST_REMOVE(ap, next);
+ free(ap);
+ count++;
+ ap = ap_prev;
+ } else if (pthread_equal(ap->executing_id,
+ pthread_self()) == 0) {
+ executing++;
+ } else {
+ err = EINPROGRESS;
+ }
+ }
+ ap_prev = ap;
+ }
+ rte_spinlock_unlock(&alarm_list_lk);
+ } while (executing != 0);
+
+ if (count == 0 && err == 0)
+ rte_errno = ENOENT;
+ else if (err)
+ rte_errno = err;
+
+ rte_spinlock_lock(&alarm_list_lk);
+
+ /* unregister if no alarms left, otherwise re-register first */
+ if (LIST_EMPTY(&alarm_list))
+ unregister_current_callback();
+ else
+ register_first_callback();
+
+ rte_spinlock_unlock(&alarm_list_lk);
+
+ return count;
}
Code Review / deb_dpdk.git / blobdiff