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
|
/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* SDU scheduler component
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#define OUROBOROS_PREFIX "sdu-scheduler"
#include <ouroboros/config.h>
#include <ouroboros/logs.h>
#include <ouroboros/errno.h>
#include "sdu_sched.h"
#include <stdbool.h>
#include <assert.h>
#include <stdlib.h>
#define FD_UPDATE_TIMEOUT 10000 /* nanoseconds */
struct sdu_sched {
flow_set_t * set[QOS_CUBE_MAX];
next_sdu_t callback;
pthread_t sdu_readers[IPCP_SCHED_THREADS];
};
static void cleanup_reader(void * o)
{
int i;
fqueue_t ** fqs = (fqueue_t **) o;
for (i = 0; i < QOS_CUBE_MAX; ++i)
fqueue_destroy(fqs[i]);
}
static void * sdu_reader(void * o)
{
struct sdu_sched * sched;
struct shm_du_buff * sdb;
struct timespec timeout = {0, FD_UPDATE_TIMEOUT};
int fd;
int i = 0;
int ret;
fqueue_t * fqs[QOS_CUBE_MAX];
sched = (struct sdu_sched *) o;
for (i = 0; i < QOS_CUBE_MAX; ++i) {
fqs[i] = fqueue_create();
if (fqs[i] == NULL) {
int j;
for (j = 0; j < i; ++j)
fqueue_destroy(fqs[j]);
return (void *) -1;
}
}
pthread_cleanup_push(cleanup_reader, fqs);
while (true) {
/* FIXME: replace with scheduling policy call */
i = (i + 1) % QOS_CUBE_MAX;
ret = flow_event_wait(sched->set[i], fqs[i], &timeout);
if (ret == -ETIMEDOUT)
continue;
if (ret < 0) {
log_warn("Event error: %d.", ret);
continue;
}
while ((fd = fqueue_next(fqs[i])) >= 0) {
if (ipcp_flow_read(fd, &sdb)) {
log_warn("Failed to read SDU from fd %d.", fd);
continue;
}
if (sched->callback(fd, i, sdb)) {
log_warn("Callback reported an error.");
continue;
}
}
}
pthread_cleanup_pop(true);
return (void *) 0;
}
struct sdu_sched * sdu_sched_create(next_sdu_t callback)
{
struct sdu_sched * sdu_sched;
int i;
int j;
sdu_sched = malloc(sizeof(*sdu_sched));
if (sdu_sched == NULL)
goto fail_malloc;
sdu_sched->callback = callback;
for (i = 0; i < QOS_CUBE_MAX; ++i) {
sdu_sched->set[i] = flow_set_create();
if (sdu_sched->set[i] == NULL) {
for (j = 0; j < i; ++j)
flow_set_destroy(sdu_sched->set[j]);
goto fail_flow_set;
}
}
for (i = 0; i < IPCP_SCHED_THREADS; ++i) {
if (pthread_create(&sdu_sched->sdu_readers[i], NULL,
sdu_reader, sdu_sched)) {
int j;
for (j = 0; j < i; ++j) {
pthread_cancel(sdu_sched->sdu_readers[j]);
pthread_join(sdu_sched->sdu_readers[j], NULL);
}
goto fail_flow_set;
}
}
return sdu_sched;
fail_flow_set:
free(sdu_sched);
fail_malloc:
return NULL;
}
void sdu_sched_destroy(struct sdu_sched * sdu_sched)
{
int i;
assert(sdu_sched);
for (i = 0; i < IPCP_SCHED_THREADS; ++i) {
pthread_cancel(sdu_sched->sdu_readers[i]);
pthread_join(sdu_sched->sdu_readers[i], NULL);
}
for (i = 0; i < QOS_CUBE_MAX; ++i)
flow_set_destroy(sdu_sched->set[i]);
free(sdu_sched);
}
void sdu_sched_add(struct sdu_sched * sdu_sched,
int fd)
{
qoscube_t qc;
ipcp_flow_get_qoscube(fd, &qc);
flow_set_add(sdu_sched->set[qc], fd);
}
void sdu_sched_del(struct sdu_sched * sdu_sched,
int fd)
{
qoscube_t qc;
ipcp_flow_get_qoscube(fd, &qc);
flow_set_del(sdu_sched->set[qc], fd);
}
|
