1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <stdio.h>
#include <stdint.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/timerfd.h>
#include <rte_memory.h>
#include <rte_interrupts.h>
#include <rte_alarm.h>
#include <rte_common.h>
#include <rte_per_lcore.h>
#include <rte_eal.h>
#include <rte_launch.h>
#include <rte_lcore.h>
#include <rte_errno.h>
#include <rte_spinlock.h>
#include <eal_private.h>
#ifndef TFD_NONBLOCK
#include <fcntl.h>
#define TFD_NONBLOCK O_NONBLOCK
#endif
#define NS_PER_US 1000
#define US_PER_MS 1000
#define MS_PER_S 1000
#ifndef US_PER_S
#define US_PER_S (US_PER_MS * MS_PER_S)
#endif
#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 timeval 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 int handler_registered = 0;
static void eal_alarm_callback(void *arg);
int
rte_eal_alarm_init(void)
{
intr_handle.type = RTE_INTR_HANDLE_ALARM;
/* create a timerfd file descriptor */
intr_handle.fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
if (intr_handle.fd == -1)
goto error;
return 0;
error:
rte_errno = errno;
return -1;
}
static void
eal_alarm_callback(void *arg __rte_unused)
{
struct timespec now;
struct alarm_entry *ap;
rte_spinlock_lock(&alarm_list_lk);
while ((ap = LIST_FIRST(&alarm_list)) !=NULL &&
clock_gettime(CLOCK_TYPE_ID, &now) == 0 &&
(ap->time.tv_sec < now.tv_sec || (ap->time.tv_sec == now.tv_sec &&
(ap->time.tv_usec * NS_PER_US) <= now.tv_nsec))) {
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);
}
if (!LIST_EMPTY(&alarm_list)) {
struct itimerspec atime = { .it_interval = { 0, 0 } };
ap = LIST_FIRST(&alarm_list);
atime.it_value.tv_sec = ap->time.tv_sec;
atime.it_value.tv_nsec = ap->time.tv_usec * NS_PER_US;
/* perform borrow for subtraction if necessary */
if (now.tv_nsec > (ap->time.tv_usec * NS_PER_US))
atime.it_value.tv_sec--, atime.it_value.tv_nsec += US_PER_S * NS_PER_US;
atime.it_value.tv_sec -= now.tv_sec;
atime.it_value.tv_nsec -= now.tv_nsec;
timerfd_settime(intr_handle.fd, 0, &atime, NULL);
}
rte_spinlock_unlock(&alarm_list_lk);
}
int
rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback cb_fn, void *cb_arg)
{
struct timespec now;
int ret = 0;
struct alarm_entry *ap, *new_alarm;
/* Check parameters, including that 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);
new_alarm->cb_fn = cb_fn;
new_alarm->cb_arg = cb_arg;
new_alarm->time.tv_usec = ((now.tv_nsec / NS_PER_US) + us) % US_PER_S;
new_alarm->time.tv_sec = now.tv_sec + (((now.tv_nsec / NS_PER_US) + us) / US_PER_S);
rte_spinlock_lock(&alarm_list_lk);
if (!handler_registered) {
ret |= rte_intr_callback_register(&intr_handle,
eal_alarm_callback, NULL);
handler_registered = (ret == 0) ? 1 : 0;
}
if (LIST_EMPTY(&alarm_list))
LIST_INSERT_HEAD(&alarm_list, new_alarm, next);
else {
LIST_FOREACH(ap, &alarm_list, next) {
if (ap->time.tv_sec > new_alarm->time.tv_sec ||
(ap->time.tv_sec == new_alarm->time.tv_sec &&
ap->time.tv_usec > new_alarm->time.tv_usec)){
LIST_INSERT_BEFORE(ap, new_alarm, next);
break;
}
if (LIST_NEXT(ap, next) == NULL) {
LIST_INSERT_AFTER(ap, new_alarm, next);
break;
}
}
}
if (LIST_FIRST(&alarm_list) == new_alarm) {
struct itimerspec alarm_time = {
.it_interval = {0, 0},
.it_value = {
.tv_sec = us / US_PER_S,
.tv_nsec = (us % US_PER_S) * NS_PER_US,
},
};
ret |= timerfd_settime(intr_handle.fd, 0, &alarm_time, NULL);
}
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 ((ap = LIST_FIRST(&alarm_list)) != NULL &&
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++;
} else {
/* If calling from other context, mark that alarm is executing
* so loop can spin till it finish. Otherwise we are trying to
* cancel our self - 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;
return count;
}
|
