1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2017 6WIND S.A.
3 * Copyright 2017 Mellanox Technologies, Ltd
8 * Utility functions used by the mlx4 driver.
17 #include <rte_errno.h>
18 #include <rte_malloc.h>
19 #include <rte_memory.h>
21 #include "mlx4_utils.h"
24 * Make a file descriptor non-blocking.
27 * File descriptor to alter.
30 * 0 on success, negative errno value otherwise and rte_errno is set.
33 mlx4_fd_set_non_blocking(int fd)
35 int ret = fcntl(fd, F_GETFL);
37 if (ret != -1 && !fcntl(fd, F_SETFL, ret | O_NONBLOCK))
45 * Internal helper to allocate memory once for several disparate objects.
47 * The most restrictive alignment constraint for standard objects is assumed
48 * to be sizeof(double) and is used as a default value.
50 * C11 code would include stdalign.h and use alignof(max_align_t) however
51 * we'll stick with C99 for the time being.
54 mlx4_mallocv_inline(const char *type, const struct mlx4_malloc_vec *vec,
55 unsigned int cnt, int zero, int socket)
61 int fill = !vec[0].addr;
66 for (i = 0; i < cnt; ++i) {
67 size_t align = (uintptr_t)vec[i].align;
70 align = sizeof(double);
71 } else if (!rte_is_power_of_2(align)) {
77 align = RTE_ALIGN_CEIL(size, align);
78 size = align + vec[i].size;
79 if (fill && vec[i].addr)
80 *vec[i].addr = data + align;
85 data = rte_malloc_socket(type, size, least, socket);
87 data = rte_zmalloc_socket(type, size, least, socket);
94 for (i = 0; i != cnt; ++i)
101 * Allocate memory once for several disparate objects.
103 * This function adds iovec-like semantics (e.g. readv()) to rte_malloc().
104 * Memory is allocated once for several contiguous objects of nonuniform
105 * sizes and alignment constraints.
107 * Each entry of @p vec describes the size, alignment constraint and
108 * provides a buffer address where the resulting object pointer must be
111 * The buffer of the first entry is guaranteed to point to the beginning of
112 * the allocated region and is safe to use with rte_free().
114 * NULL buffers are silently ignored.
116 * Providing a NULL buffer in the first entry prevents this function from
117 * allocating any memory but has otherwise no effect on its behavior. In
118 * this case, the contents of remaining non-NULL buffers are updated with
119 * addresses relative to zero (i.e. offsets that would have been used during
123 * A string identifying the type of allocated objects (useful for debug
124 * purposes, such as identifying the cause of a memory leak). Can be NULL.
125 * @param[in, out] vec
126 * Description of objects to allocate memory for.
128 * Number of entries in @p vec.
131 * Size in bytes of the allocated region including any padding. In case of
132 * error, rte_errno is set, 0 is returned and NULL is stored in the
133 * non-NULL buffers pointed by @p vec.
135 * @see struct mlx4_malloc_vec
139 mlx4_mallocv(const char *type, const struct mlx4_malloc_vec *vec,
142 return mlx4_mallocv_inline(type, vec, cnt, 0, SOCKET_ID_ANY);
146 * Combines the semantics of mlx4_mallocv() with those of rte_zmalloc().
148 * @see mlx4_mallocv()
152 mlx4_zmallocv(const char *type, const struct mlx4_malloc_vec *vec,
155 return mlx4_mallocv_inline(type, vec, cnt, 1, SOCKET_ID_ANY);
159 * Socket-aware version of mlx4_mallocv().
161 * This function takes one additional parameter.
164 * NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this
165 * function will behave the same as mlx4_mallocv().
167 * @see mlx4_mallocv()
168 * @see rte_malloc_socket()
171 mlx4_mallocv_socket(const char *type, const struct mlx4_malloc_vec *vec,
172 unsigned int cnt, int socket)
174 return mlx4_mallocv_inline(type, vec, cnt, 0, socket);
178 * Combines the semantics of mlx4_mallocv_socket() with those of
179 * mlx4_zmalloc_socket().
181 * @see mlx4_mallocv_socket()
182 * @see rte_zmalloc_socket()
185 mlx4_zmallocv_socket(const char *type, const struct mlx4_malloc_vec *vec,
186 unsigned int cnt, int socket)
188 return mlx4_mallocv_inline(type, vec, cnt, 1, socket);