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
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Intel Corporation
*/
#include <sys/queue.h>
#include <string.h>
#include <rte_tailq.h>
#include <rte_memzone.h>
#include <rte_rwlock.h>
#include <rte_eal_memconfig.h>
#include "rte_event_ring.h"
TAILQ_HEAD(rte_event_ring_list, rte_tailq_entry);
static struct rte_tailq_elem rte_event_ring_tailq = {
.name = RTE_TAILQ_EVENT_RING_NAME,
};
EAL_REGISTER_TAILQ(rte_event_ring_tailq)
int
rte_event_ring_init(struct rte_event_ring *r, const char *name,
unsigned int count, unsigned int flags)
{
/* compilation-time checks */
RTE_BUILD_BUG_ON((sizeof(struct rte_event_ring) &
RTE_CACHE_LINE_MASK) != 0);
/* init the ring structure */
return rte_ring_init(&r->r, name, count, flags);
}
/* create the ring */
struct rte_event_ring *
rte_event_ring_create(const char *name, unsigned int count, int socket_id,
unsigned int flags)
{
char mz_name[RTE_MEMZONE_NAMESIZE];
struct rte_event_ring *r;
struct rte_tailq_entry *te;
const struct rte_memzone *mz;
ssize_t ring_size;
int mz_flags = 0;
struct rte_event_ring_list *ring_list = NULL;
const unsigned int requested_count = count;
int ret;
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
/* for an exact size ring, round up from count to a power of two */
if (flags & RING_F_EXACT_SZ)
count = rte_align32pow2(count + 1);
else if (!rte_is_power_of_2(count)) {
rte_errno = EINVAL;
return NULL;
}
ring_size = sizeof(*r) + (count * sizeof(struct rte_event));
ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
RTE_RING_MZ_PREFIX, name);
if (ret < 0 || ret >= (int)sizeof(mz_name)) {
rte_errno = ENAMETOOLONG;
return NULL;
}
te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
if (te == NULL) {
RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
rte_errno = ENOMEM;
return NULL;
}
rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
/*
* reserve a memory zone for this ring. If we can't get rte_config or
* we are secondary process, the memzone_reserve function will set
* rte_errno for us appropriately - hence no check in this this function
*/
mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
if (mz != NULL) {
r = mz->addr;
/*
* no need to check return value here, we already checked the
* arguments above
*/
rte_event_ring_init(r, name, requested_count, flags);
te->data = (void *) r;
r->r.memzone = mz;
TAILQ_INSERT_TAIL(ring_list, te, next);
} else {
r = NULL;
RTE_LOG(ERR, RING, "Cannot reserve memory\n");
rte_free(te);
}
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
return r;
}
struct rte_event_ring *
rte_event_ring_lookup(const char *name)
{
struct rte_tailq_entry *te;
struct rte_event_ring *r = NULL;
struct rte_event_ring_list *ring_list;
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
TAILQ_FOREACH(te, ring_list, next) {
r = (struct rte_event_ring *) te->data;
if (strncmp(name, r->r.name, RTE_RING_NAMESIZE) == 0)
break;
}
rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
if (te == NULL) {
rte_errno = ENOENT;
return NULL;
}
return r;
}
/* free the ring */
void
rte_event_ring_free(struct rte_event_ring *r)
{
struct rte_event_ring_list *ring_list = NULL;
struct rte_tailq_entry *te;
if (r == NULL)
return;
/*
* Ring was not created with rte_event_ring_create,
* therefore, there is no memzone to free.
*/
if (r->r.memzone == NULL) {
RTE_LOG(ERR, RING,
"Cannot free ring (not created with rte_event_ring_create()");
return;
}
if (rte_memzone_free(r->r.memzone) != 0) {
RTE_LOG(ERR, RING, "Cannot free memory\n");
return;
}
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
/* find out tailq entry */
TAILQ_FOREACH(te, ring_list, next) {
if (te->data == (void *) r)
break;
}
if (te == NULL) {
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
return;
}
TAILQ_REMOVE(ring_list, te, next);
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
rte_free(te);
}
|
