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38 #include <sys/queue.h>
40 #include <sys/timerfd.h>
42 #include <rte_memory.h>
43 #include <rte_memzone.h>
44 #include <rte_interrupts.h>
45 #include <rte_alarm.h>
46 #include <rte_common.h>
47 #include <rte_per_lcore.h>
48 #include <rte_tailq.h>
50 #include <rte_launch.h>
51 #include <rte_lcore.h>
52 #include <rte_errno.h>
53 #include <rte_malloc.h>
54 #include <rte_spinlock.h>
55 #include <eal_private.h>
59 #define TFD_NONBLOCK O_NONBLOCK
62 #define NS_PER_US 1000
63 #define US_PER_MS 1000
65 #define US_PER_S (US_PER_MS * MS_PER_S)
68 LIST_ENTRY(alarm_entry) next;
70 rte_eal_alarm_callback cb_fn;
72 volatile int executing;
75 static LIST_HEAD(alarm_list, alarm_entry) alarm_list = LIST_HEAD_INITIALIZER();
76 static rte_spinlock_t alarm_list_lk = RTE_SPINLOCK_INITIALIZER;
78 static struct rte_intr_handle intr_handle = {.fd = -1 };
79 static int handler_registered = 0;
80 static void eal_alarm_callback(struct rte_intr_handle *hdl, void *arg);
83 rte_eal_alarm_init(void)
85 intr_handle.type = RTE_INTR_HANDLE_ALARM;
86 /* create a timerfd file descriptor */
87 intr_handle.fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
88 if (intr_handle.fd == -1)
99 eal_alarm_callback(struct rte_intr_handle *hdl __rte_unused,
100 void *arg __rte_unused)
103 struct alarm_entry *ap;
105 rte_spinlock_lock(&alarm_list_lk);
106 while ((ap = LIST_FIRST(&alarm_list)) !=NULL &&
107 gettimeofday(&now, NULL) == 0 &&
108 (ap->time.tv_sec < now.tv_sec || (ap->time.tv_sec == now.tv_sec &&
109 ap->time.tv_usec <= now.tv_usec))){
111 rte_spinlock_unlock(&alarm_list_lk);
113 ap->cb_fn(ap->cb_arg);
115 rte_spinlock_lock(&alarm_list_lk);
116 LIST_REMOVE(ap, next);
120 if (!LIST_EMPTY(&alarm_list)) {
121 struct itimerspec atime = { .it_interval = { 0, 0 } };
123 ap = LIST_FIRST(&alarm_list);
124 atime.it_value.tv_sec = ap->time.tv_sec;
125 atime.it_value.tv_nsec = ap->time.tv_usec * NS_PER_US;
126 /* perform borrow for subtraction if necessary */
127 if (now.tv_usec > ap->time.tv_usec)
128 atime.it_value.tv_sec--, atime.it_value.tv_nsec += US_PER_S * NS_PER_US;
130 atime.it_value.tv_sec -= now.tv_sec;
131 atime.it_value.tv_nsec -= now.tv_usec * NS_PER_US;
132 timerfd_settime(intr_handle.fd, 0, &atime, NULL);
134 rte_spinlock_unlock(&alarm_list_lk);
138 rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback cb_fn, void *cb_arg)
142 struct alarm_entry *ap, *new_alarm;
144 /* Check parameters, including that us won't cause a uint64_t overflow */
145 if (us < 1 || us > (UINT64_MAX - US_PER_S) || cb_fn == NULL)
148 new_alarm = rte_malloc(NULL, sizeof(*new_alarm), 0);
149 if (new_alarm == NULL)
152 /* use current time to calculate absolute time of alarm */
153 gettimeofday(&now, NULL);
155 new_alarm->cb_fn = cb_fn;
156 new_alarm->cb_arg = cb_arg;
157 new_alarm->time.tv_usec = (now.tv_usec + us) % US_PER_S;
158 new_alarm->time.tv_sec = now.tv_sec + ((now.tv_usec + us) / US_PER_S);
159 new_alarm->executing = 0;
161 rte_spinlock_lock(&alarm_list_lk);
162 if (!handler_registered) {
163 ret |= rte_intr_callback_register(&intr_handle,
164 eal_alarm_callback, NULL);
165 handler_registered = (ret == 0) ? 1 : 0;
168 if (LIST_EMPTY(&alarm_list))
169 LIST_INSERT_HEAD(&alarm_list, new_alarm, next);
171 LIST_FOREACH(ap, &alarm_list, next) {
172 if (ap->time.tv_sec > new_alarm->time.tv_sec ||
173 (ap->time.tv_sec == new_alarm->time.tv_sec &&
174 ap->time.tv_usec > new_alarm->time.tv_usec)){
175 LIST_INSERT_BEFORE(ap, new_alarm, next);
178 if (LIST_NEXT(ap, next) == NULL) {
179 LIST_INSERT_AFTER(ap, new_alarm, next);
185 if (LIST_FIRST(&alarm_list) == new_alarm) {
186 struct itimerspec alarm_time = {
187 .it_interval = {0, 0},
189 .tv_sec = us / US_PER_S,
190 .tv_nsec = (us % US_PER_S) * NS_PER_US,
193 ret |= timerfd_settime(intr_handle.fd, 0, &alarm_time, NULL);
195 rte_spinlock_unlock(&alarm_list_lk);
201 rte_eal_alarm_cancel(rte_eal_alarm_callback cb_fn, void *cb_arg)
203 struct alarm_entry *ap, *ap_prev;
209 rte_spinlock_lock(&alarm_list_lk);
210 /* remove any matches at the start of the list */
211 while ((ap = LIST_FIRST(&alarm_list)) != NULL &&
212 cb_fn == ap->cb_fn && ap->executing == 0 &&
213 (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
214 LIST_REMOVE(ap, next);
220 /* now go through list, removing entries not at start */
221 LIST_FOREACH(ap, &alarm_list, next) {
222 /* this won't be true first time through */
223 if (cb_fn == ap->cb_fn && ap->executing == 0 &&
224 (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
225 LIST_REMOVE(ap,next);
232 rte_spinlock_unlock(&alarm_list_lk);