Line data    Source code

       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:
       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             :   Copyright (c) 2005 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,
      22             :   distribute, sublicense, and/or sell copies of the Software, and to
      23             :   permit persons to whom the Software is furnished to do so, subject to
      24             :   the following conditions:
      25             : 
      26             :   The above copyright notice and this permission notice shall be
      27             :   included in all copies or substantial portions of the Software.
      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
      32             :   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
      33             :   LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
      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/random_buffer.h>
      39             : 
      40             : /* Fill random buffer. */
      41             : __clib_export void
      42        1724 : clib_random_buffer_fill (clib_random_buffer_t * b, uword n_words)
      43             : {
      44        1724 :   uword *w, n = n_words;
      45             : 
      46        1724 :   if (n < 256)
      47        1664 :     n = 256;
      48             : 
      49        1724 :   n = round_pow2 (n, 2 << ISAAC_LOG2_SIZE);
      50             : 
      51        1724 :   vec_add2 (b->buffer, w, n);
      52             :   do
      53             :     {
      54       13843 :       isaac2 (b->ctx, w);
      55       13843 :       w += 2 * ISAAC_SIZE;
      56       13843 :       n -= 2 * ISAAC_SIZE;
      57             :     }
      58       13843 :   while (n > 0);
      59        1724 : }
      60             : 
      61             : __clib_export void
      62         560 : clib_random_buffer_init (clib_random_buffer_t * b, uword seed)
      63             : {
      64             :   uword i, j;
      65             : 
      66         560 :   clib_memset (b, 0, sizeof (b[0]));
      67             : 
      68             :   /* Seed ISAAC. */
      69        1680 :   for (i = 0; i < ARRAY_LEN (b->ctx); i++)
      70             :     {
      71             :       uword s[ISAAC_SIZE];
      72             : 
      73       19040 :       for (j = 0; j < ARRAY_LEN (s); j++)
      74       17920 :         s[j] = ARRAY_LEN (b->ctx) * (seed + j) + i;
      75             : 
      76        1120 :       isaac_init (&b->ctx[i], s);
      77             :     }
      78         560 : }
      79             : 
      80             : /*
      81             :  * fd.io coding-style-patch-verification: ON
      82             :  *
      83             :  * Local Variables:
      84             :  * eval: (c-set-style "gnu")
      85             :  * End:
      86             :  */