FD.io VPP  v17.07.01-10-g3be13f0
Vector Packet Processing
util.c
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1 /*
2  * Copyright (c) 2016 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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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  * pci.c: Linux user space PCI bus management.
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #include <vlib/vlib.h>
41 #include <vlib/unix/unix.h>
42 
43 #include <sys/types.h>
44 #include <sys/stat.h>
45 #include <fcntl.h>
46 #include <dirent.h>
47 
49 foreach_directory_file (char *dir_name,
50  clib_error_t * (*f) (void *arg, u8 * path_name,
51  u8 * file_name), void *arg,
52  int scan_dirs)
53 {
54  DIR *d;
55  struct dirent *e;
56  clib_error_t *error = 0;
57  u8 *s, *t;
58 
59  d = opendir (dir_name);
60  if (!d)
61  {
62  if (errno == ENOENT)
63  return 0;
64  return clib_error_return_unix (0, "open `%s'", dir_name);
65  }
66 
67  s = t = 0;
68  while (1)
69  {
70  e = readdir (d);
71  if (!e)
72  break;
73  if (scan_dirs)
74  {
75  if (e->d_type == DT_DIR
76  && (!strcmp (e->d_name, ".") || !strcmp (e->d_name, "..")))
77  continue;
78  }
79  else
80  {
81  if (e->d_type == DT_DIR)
82  continue;
83  }
84 
85  s = format (s, "%s/%s", dir_name, e->d_name);
86  t = format (t, "%s", e->d_name);
87  error = f (arg, s, t);
88  _vec_len (s) = 0;
89  _vec_len (t) = 0;
90 
91  if (error)
92  break;
93  }
94 
95  vec_free (s);
96  closedir (d);
97 
98  return error;
99 }
100 
101 clib_error_t *
102 vlib_sysfs_write (char *file_name, char *fmt, ...)
103 {
104  u8 *s;
105  int fd;
106  clib_error_t *error = 0;
107 
108  fd = open (file_name, O_WRONLY);
109  if (fd < 0)
110  return clib_error_return_unix (0, "open `%s'", file_name);
111 
112  va_list va;
113  va_start (va, fmt);
114  s = va_format (0, fmt, &va);
115  va_end (va);
116 
117  if (write (fd, s, vec_len (s)) < 0)
118  error = clib_error_return_unix (0, "write `%s'", file_name);
119 
120  vec_free (s);
121  close (fd);
122  return error;
123 }
124 
125 clib_error_t *
126 vlib_sysfs_read (char *file_name, char *fmt, ...)
127 {
128  unformat_input_t input;
129  u8 *s = 0;
130  int fd;
131  ssize_t sz;
132  uword result;
133 
134  fd = open (file_name, O_RDONLY);
135  if (fd < 0)
136  return clib_error_return_unix (0, "open `%s'", file_name);
137 
138  vec_validate (s, 4095);
139 
140  sz = read (fd, s, vec_len (s));
141  if (sz < 0)
142  {
143  close (fd);
144  vec_free (s);
145  return clib_error_return_unix (0, "read `%s'", file_name);
146  }
147 
148  _vec_len (s) = sz;
149  unformat_init_vector (&input, s);
150 
151  va_list va;
152  va_start (va, fmt);
153  result = va_unformat (&input, fmt, &va);
154  va_end (va);
155 
156  vec_free (s);
157  close (fd);
158 
159  if (result == 0)
160  return clib_error_return (0, "unformat error");
161 
162  return 0;
163 }
164 
165 u8 *
167 {
168  char *p, buffer[64];
169  unformat_input_t in;
170  u8 *s = 0;
171  int r;
172 
173  r = readlink (link, buffer, sizeof (buffer) - 1);
174 
175  if (r < 0)
176  return 0;
177 
178  buffer[r] = 0;
179  p = strrchr (buffer, '/');
180 
181  if (!p)
182  return 0;
183 
184  unformat_init_string (&in, p + 1, strlen (p + 1));
185  if (unformat (&in, "%s", &s) != 1)
186  clib_unix_warning ("no string?");
187  unformat_free (&in);
188 
189  return s;
190 }
191 
192 int
193 vlib_sysfs_get_free_hugepages (unsigned int numa_node, int page_size)
194 {
195  struct stat sb;
196  u8 *p = 0;
197  int r = -1;
198 
199  p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
200 
201  if (stat ((char *) p, &sb) == 0)
202  {
203  if (S_ISDIR (sb.st_mode) == 0)
204  goto done;
205  }
206  else if (numa_node == 0)
207  {
208  vec_reset_length (p);
209  p = format (p, "/sys/kernel/mm%c", 0);
210  if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
211  goto done;
212  }
213  else
214  goto done;
215 
216  _vec_len (p) -= 1;
217  p = format (p, "/hugepages/hugepages-%ukB/free_hugepages%c", page_size, 0);
218  vlib_sysfs_read ((char *) p, "%d", &r);
219 
220 done:
221  vec_free (p);
222  return r;
223 }
224 
225 /*
226  * fd.io coding-style-patch-verification: ON
227  *
228  * Local Variables:
229  * eval: (c-set-style "gnu")
230  * End:
231  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:436
clib_error_t * vlib_sysfs_write(char *file_name, char *fmt,...)
Definition: util.c:102
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
u8 * va_format(u8 *s, const char *fmt, va_list *va)
Definition: format.c:387
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
u8 * vlib_sysfs_link_to_name(char *link)
Definition: util.c:166
#define clib_error_return(e, args...)
Definition: error.h:99
void unformat_init_string(unformat_input_t *input, char *string, int string_len)
Definition: unformat.c:1023
int vlib_sysfs_get_free_hugepages(unsigned int numa_node, int page_size)
Definition: util.c:193
struct _unformat_input_t unformat_input_t
#define clib_error_return_unix(e, args...)
Definition: error.h:102
clib_error_t * vlib_sysfs_read(char *file_name, char *fmt,...)
Definition: util.c:126
void unformat_init_vector(unformat_input_t *input, u8 *vector_string)
Definition: unformat.c:1031
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:340
u64 uword
Definition: types.h:112
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static void unformat_free(unformat_input_t *i)
Definition: format.h:161
#define clib_unix_warning(format, args...)
Definition: error.h:68
uword va_unformat(unformat_input_t *i, const char *fmt, va_list *args)
Definition: unformat.c:833
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
clib_error_t * foreach_directory_file(char *dir_name, clib_error_t *(*f)(void *arg, u8 *path_name, u8 *file_name), void *arg, int scan_dirs)
Definition: util.c:49