FD.io VPP  v17.07.01-10-g3be13f0
Vector Packet Processing
smp_fifo.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
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7  * http://www.apache.org/licenses/LICENSE-2.0
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9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  Copyright (c) 2012 Eliot Dresselhaus
17 
18  Permission is hereby granted, free of charge, to any person obtaining
19  a copy of this software and associated documentation files (the
20  "Software"), to deal in the Software without restriction, including
21  without limitation the rights to use, copy, modify, merge, publish,
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25 
26  The above copyright notice and this permission notice shall be
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28 
29  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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34  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 */
37 
38 #include <vppinfra/smp_fifo.h>
39 #include <vppinfra/mem.h>
40 
42 clib_smp_fifo_init (uword max_n_elts, uword n_bytes_per_elt)
43 {
44  clib_smp_fifo_t *f;
45  uword n_bytes_per_elt_cache_aligned;
46 
47  f = clib_mem_alloc_aligned (sizeof (f[0]), CLIB_CACHE_LINE_BYTES);
48 
49  memset (f, 0, sizeof (f[0]));
50 
51  max_n_elts = max_n_elts ? max_n_elts : 32;
52  f->log2_max_n_elts = max_log2 (max_n_elts);
53  f->max_n_elts_less_one = (1 << f->log2_max_n_elts) - 1;
54 
55  n_bytes_per_elt_cache_aligned =
56  clib_smp_fifo_round_elt_bytes (n_bytes_per_elt);
57  clib_exec_on_global_heap (
58  {
59  f->data =
61  (n_bytes_per_elt_cache_aligned <<
63  );
64 
65  /* Zero all data and mark all elements free. */
66  {
67  uword i;
68  for (i = 0; i <= f->max_n_elts_less_one; i++)
69  {
70  void *d = clib_smp_fifo_elt_at_index (f, n_bytes_per_elt, i);
72 
73  memset (d, 0, n_bytes_per_elt_cache_aligned);
74 
75  t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
77  CLIB_SMP_FIFO_DATA_STATE_free);
78  }
79  }
80 
81  return f;
82 }
83 
84 
85 /*
86  * fd.io coding-style-patch-verification: ON
87  *
88  * Local Variables:
89  * eval: (c-set-style "gnu")
90  * End:
91  */
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:337
static uword clib_smp_fifo_round_elt_bytes(uword n_bytes_per_elt)
Definition: smp_fifo.h:106
void * data
Definition: smp_fifo.h:98
static clib_smp_fifo_data_footer_t * clib_smp_fifo_get_data_footer(void *d, uword n_bytes_per_elt)
Definition: smp_fifo.h:120
clib_smp_fifo_t * clib_smp_fifo_init(uword max_n_elts, uword n_bytes_per_elt)
Definition: smp_fifo.c:42
u32 log2_max_n_elts
Definition: smp_fifo.h:95
static void clib_smp_fifo_data_footer_set_state(clib_smp_fifo_data_footer_t *f, clib_smp_fifo_data_state_t s)
Definition: smp_fifo.h:79
u64 uword
Definition: types.h:112
static uword max_log2(uword x)
Definition: clib.h:228
static void * clib_mem_alloc_aligned(uword size, uword align)
Definition: mem.h:117
static void * clib_smp_fifo_elt_at_index(clib_smp_fifo_t *f, uword n_bytes_per_elt, uword i)
Definition: smp_fifo.h:128
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
u32 max_n_elts_less_one
Definition: smp_fifo.h:92