4 * Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
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8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * version: DPDK.L.1.2.3-3
40 #include <sys/queue.h>
42 #include <sys/timerfd.h>
44 #include <rte_memory.h>
45 #include <rte_memzone.h>
46 #include <rte_interrupts.h>
47 #include <rte_alarm.h>
48 #include <rte_common.h>
49 #include <rte_per_lcore.h>
50 #include <rte_tailq.h>
52 #include <rte_launch.h>
53 #include <rte_lcore.h>
54 #include <rte_errno.h>
55 #include <rte_malloc.h>
56 #include <rte_spinlock.h>
57 #include <eal_private.h>
59 #define NS_PER_US 1000
60 #define US_PER_MS 1000
62 #define US_PER_S (US_PER_MS * MS_PER_S)
65 LIST_ENTRY(alarm_entry) next;
67 rte_eal_alarm_callback cb_fn;
69 volatile int executing;
72 static LIST_HEAD(alarm_list, alarm_entry) alarm_list = LIST_HEAD_INITIALIZER();
73 static rte_spinlock_t alarm_list_lk = RTE_SPINLOCK_INITIALIZER;
75 static struct rte_intr_handle intr_handle = {.fd = -1 };
76 static int handler_registered = 0;
77 static void eal_alarm_callback(struct rte_intr_handle *hdl, void *arg);
80 rte_eal_alarm_init(void)
82 intr_handle.type = RTE_INTR_HANDLE_ALARM;
83 /* create a timerfd file descriptor */
84 intr_handle.fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
85 if (intr_handle.fd == -1)
96 eal_alarm_callback(struct rte_intr_handle *hdl __rte_unused,
97 void *arg __rte_unused)
100 struct alarm_entry *ap;
102 rte_spinlock_lock(&alarm_list_lk);
103 while ((ap = LIST_FIRST(&alarm_list)) !=NULL &&
104 gettimeofday(&now, NULL) == 0 &&
105 (ap->time.tv_sec < now.tv_sec || (ap->time.tv_sec == now.tv_sec &&
106 ap->time.tv_usec <= now.tv_usec))){
108 rte_spinlock_unlock(&alarm_list_lk);
110 ap->cb_fn(ap->cb_arg);
112 rte_spinlock_lock(&alarm_list_lk);
113 LIST_REMOVE(ap, next);
117 if (!LIST_EMPTY(&alarm_list)) {
118 struct itimerspec atime = { .it_interval = { 0, 0 } };
120 ap = LIST_FIRST(&alarm_list);
121 atime.it_value.tv_sec = ap->time.tv_sec;
122 atime.it_value.tv_nsec = ap->time.tv_usec * NS_PER_US;
123 /* perform borrow for subtraction if necessary */
124 if (now.tv_usec > ap->time.tv_usec)
125 atime.it_value.tv_sec--, atime.it_value.tv_nsec += US_PER_S * NS_PER_US;
127 atime.it_value.tv_sec -= now.tv_sec;
128 atime.it_value.tv_nsec -= now.tv_usec * NS_PER_US;
129 timerfd_settime(intr_handle.fd, 0, &atime, NULL);
131 rte_spinlock_unlock(&alarm_list_lk);
135 rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback cb_fn, void *cb_arg)
139 struct alarm_entry *ap, *new_alarm;
141 /* Check parameters, including that us won't cause a uint64_t overflow */
142 if (us < 1 || us > (UINT64_MAX - US_PER_S) || cb_fn == NULL)
145 new_alarm = rte_malloc(NULL, sizeof(*new_alarm), 0);
146 if (new_alarm == NULL)
149 /* use current time to calculate absolute time of alarm */
150 gettimeofday(&now, NULL);
152 new_alarm->cb_fn = cb_fn;
153 new_alarm->cb_arg = cb_arg;
154 new_alarm->time.tv_usec = (now.tv_usec + us) % US_PER_S;
155 new_alarm->time.tv_sec = now.tv_sec + ((now.tv_usec + us) / US_PER_S);
156 new_alarm->executing = 0;
158 rte_spinlock_lock(&alarm_list_lk);
159 if (!handler_registered) {
160 ret |= rte_intr_callback_register(&intr_handle,
161 eal_alarm_callback, NULL);
162 handler_registered = (ret == 0) ? 1 : 0;
165 if (LIST_EMPTY(&alarm_list))
166 LIST_INSERT_HEAD(&alarm_list, new_alarm, next);
168 LIST_FOREACH(ap, &alarm_list, next) {
169 if (ap->time.tv_sec > new_alarm->time.tv_sec ||
170 (ap->time.tv_sec == new_alarm->time.tv_sec &&
171 ap->time.tv_usec > new_alarm->time.tv_usec)){
172 LIST_INSERT_BEFORE(ap, new_alarm, next);
175 if (LIST_NEXT(ap, next) == NULL) {
176 LIST_INSERT_AFTER(ap, new_alarm, next);
182 if (LIST_FIRST(&alarm_list) == new_alarm) {
183 struct itimerspec alarm_time = {
184 .it_interval = {0, 0},
186 .tv_sec = us / US_PER_S,
187 .tv_nsec = (us % US_PER_S) * NS_PER_US,
190 ret |= timerfd_settime(intr_handle.fd, 0, &alarm_time, NULL);
192 rte_spinlock_unlock(&alarm_list_lk);
198 rte_eal_alarm_cancel(rte_eal_alarm_callback cb_fn, void *cb_arg)
200 struct alarm_entry *ap, *ap_prev;
206 rte_spinlock_lock(&alarm_list_lk);
207 /* remove any matches at the start of the list */
208 while ((ap = LIST_FIRST(&alarm_list)) != NULL &&
209 cb_fn == ap->cb_fn && ap->executing == 0 &&
210 (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
211 LIST_REMOVE(ap, next);
217 /* now go through list, removing entries not at start */
218 LIST_FOREACH(ap, &alarm_list, next) {
219 /* this won't be true first time through */
220 if (cb_fn == ap->cb_fn && ap->executing == 0 &&
221 (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
222 LIST_REMOVE(ap,next);
229 rte_spinlock_unlock(&alarm_list_lk);