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
|
/*
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <svm/message_queue.h>
#include <vppinfra/mem.h>
svm_msg_q_t *
svm_msg_q_alloc (svm_msg_q_cfg_t * cfg)
{
svm_msg_q_ring_t *ring;
svm_msg_q_t *mq;
int i;
if (!cfg)
return 0;
mq = clib_mem_alloc_aligned (sizeof (svm_msg_q_t), CLIB_CACHE_LINE_BYTES);
memset (mq, 0, sizeof (*mq));
mq->q = svm_queue_init (cfg->q_nitems, sizeof (svm_msg_q_msg_t),
cfg->consumer_pid, 0);
vec_validate (mq->rings, cfg->n_rings - 1);
for (i = 0; i < cfg->n_rings; i++)
{
ring = &mq->rings[i];
ring->elsize = cfg->ring_cfgs[i].elsize;
ring->nitems = cfg->ring_cfgs[i].nitems;
if (cfg->ring_cfgs[i].data)
ring->data = cfg->ring_cfgs[i].data;
else
ring->data = clib_mem_alloc_aligned (ring->nitems * ring->elsize,
CLIB_CACHE_LINE_BYTES);
}
return mq;
}
void
svm_msg_q_free (svm_msg_q_t * mq)
{
svm_msg_q_ring_t *ring;
vec_foreach (ring, mq->rings)
{
clib_mem_free (ring->data);
}
vec_free (mq->rings);
clib_mem_free (mq);
}
svm_msg_q_msg_t
svm_msg_q_alloc_msg (svm_msg_q_t * mq, u32 nbytes)
{
svm_msg_q_msg_t msg = {.as_u64 = ~0 };
svm_msg_q_ring_t *ring;
vec_foreach (ring, mq->rings)
{
if (ring->elsize < nbytes || ring->cursize == ring->nitems)
continue;
msg.ring_index = ring - mq->rings;
msg.elt_index = ring->tail;
ring->tail = (ring->tail + 1) % ring->nitems;
__sync_fetch_and_add (&ring->cursize, 1);
break;
}
return msg;
}
static inline svm_msg_q_ring_t *
svm_msg_q_get_ring (svm_msg_q_t * mq, u32 ring_index)
{
return vec_elt_at_index (mq->rings, ring_index);
}
static inline void *
svm_msg_q_ring_data (svm_msg_q_ring_t * ring, u32 elt_index)
{
ASSERT (elt_index < ring->nitems);
return (ring->data + elt_index * ring->elsize);
}
void *
svm_msg_q_msg_data (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
svm_msg_q_ring_t *ring = svm_msg_q_get_ring (mq, msg->ring_index);
return svm_msg_q_ring_data (ring, msg->elt_index);
}
void
svm_msg_q_free_msg (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
svm_msg_q_ring_t *ring;
if (vec_len (mq->rings) <= msg->ring_index)
return;
ring = &mq->rings[msg->ring_index];
if (msg->elt_index == ring->head)
{
ring->head = (ring->head + 1) % ring->nitems;
}
else
{
/* for now, expect messages to be processed in order */
ASSERT (0);
}
__sync_fetch_and_sub (&ring->cursize, 1);
}
static int
svm_msq_q_msg_is_valid (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
svm_msg_q_ring_t *ring;
u32 dist1, dist2;
if (vec_len (mq->rings) <= msg->ring_index)
return 0;
ring = &mq->rings[msg->ring_index];
dist1 = ((ring->nitems + msg->ring_index) - ring->head) % ring->nitems;
if (ring->tail == ring->head)
dist2 = (ring->cursize == 0) ? 0 : ring->nitems;
else
dist2 = ((ring->nitems + ring->tail) - ring->head) % ring->nitems;
return (dist1 < dist2);
}
int
svm_msg_q_add (svm_msg_q_t * mq, svm_msg_q_msg_t msg, int nowait)
{
ASSERT (svm_msq_q_msg_is_valid (mq, &msg));
return svm_queue_add (mq->q, (u8 *) & msg, nowait);
}
int
svm_msg_q_sub (svm_msg_q_t * mq, svm_msg_q_msg_t * msg,
svm_q_conditional_wait_t cond, u32 time)
{
return svm_queue_sub (mq->q, (u8 *) msg, cond, time);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
