1 /*
2 * Copyright (c) 2024, Broadcom. All rights reserved. The term
3 * Broadcom refers to Broadcom Limited and/or its subsidiaries.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
18 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/mman.h>
31
32 #include <malloc.h>
33 #include <string.h>
34
35 #include "main.h"
36
bnxt_re_free_mem(struct bnxt_re_mem * mem)37 void bnxt_re_free_mem(struct bnxt_re_mem *mem)
38 {
39 if (mem->va_head) {
40 ibv_dofork_range(mem->va_head, mem->size);
41 munmap(mem->va_head, mem->size);
42 }
43
44 free(mem);
45 }
46
bnxt_re_alloc_mem(size_t size,uint32_t pg_size)47 void *bnxt_re_alloc_mem(size_t size, uint32_t pg_size)
48 {
49 struct bnxt_re_mem *mem;
50
51 mem = calloc(1, sizeof(*mem));
52 if (!mem)
53 return NULL;
54
55 size = get_aligned(size, pg_size);
56 mem->size = size;
57 mem->va_head = mmap(NULL, size, PROT_READ | PROT_WRITE,
58 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
59 if (mem->va_head == MAP_FAILED)
60 goto bail;
61
62 if (ibv_dontfork_range(mem->va_head, size))
63 goto unmap;
64
65 mem->head = 0;
66 mem->tail = 0;
67 mem->va_tail = (void *)((char *)mem->va_head + size);
68 return mem;
69 unmap:
70 munmap(mem->va_head, size);
71 bail:
72 free(mem);
73 return NULL;
74 }
75
bnxt_re_get_obj(struct bnxt_re_mem * mem,size_t req)76 void *bnxt_re_get_obj(struct bnxt_re_mem *mem, size_t req)
77 {
78 void *va;
79
80 if ((mem->size - mem->tail - req) < mem->head)
81 return NULL;
82 mem->tail += req;
83 va = (void *)((char *)mem->va_tail - mem->tail);
84 return va;
85 }
86
bnxt_re_get_ring(struct bnxt_re_mem * mem,size_t req)87 void *bnxt_re_get_ring(struct bnxt_re_mem *mem, size_t req)
88 {
89 void *va;
90
91 if ((mem->head + req) > (mem->size - mem->tail))
92 return NULL;
93 va = (void *)((char *)mem->va_head + mem->head);
94 mem->head += req;
95 return va;
96 }
97