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-rw-r--r--src/vppinfra/smp_fifo.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/vppinfra/smp_fifo.c b/src/vppinfra/smp_fifo.c
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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ Copyright (c) 2012 Eliot Dresselhaus
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <vppinfra/smp_fifo.h>
+#include <vppinfra/mem.h>
+
+clib_smp_fifo_t *
+clib_smp_fifo_init (uword max_n_elts, uword n_bytes_per_elt)
+{
+ clib_smp_fifo_t *f;
+ uword n_bytes_per_elt_cache_aligned;
+
+ f = clib_mem_alloc_aligned (sizeof (f[0]), CLIB_CACHE_LINE_BYTES);
+
+ memset (f, 0, sizeof (f[0]));
+
+ max_n_elts = max_n_elts ? max_n_elts : 32;
+ f->log2_max_n_elts = max_log2 (max_n_elts);
+ f->max_n_elts_less_one = (1 << f->log2_max_n_elts) - 1;
+
+ n_bytes_per_elt_cache_aligned =
+ clib_smp_fifo_round_elt_bytes (n_bytes_per_elt);
+ clib_exec_on_global_heap (
+ {
+ f->data =
+ clib_mem_alloc_aligned
+ (n_bytes_per_elt_cache_aligned <<
+ f->log2_max_n_elts, CLIB_CACHE_LINE_BYTES);}
+ );
+
+ /* Zero all data and mark all elements free. */
+ {
+ uword i;
+ for (i = 0; i <= f->max_n_elts_less_one; i++)
+ {
+ void *d = clib_smp_fifo_elt_at_index (f, n_bytes_per_elt, i);
+ clib_smp_fifo_data_footer_t *t;
+
+ memset (d, 0, n_bytes_per_elt_cache_aligned);
+
+ t = clib_smp_fifo_get_data_footer (d, n_bytes_per_elt);
+ clib_smp_fifo_data_footer_set_state (t,
+ CLIB_SMP_FIFO_DATA_STATE_free);
+ }
+ }
+
+ return f;
+}
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */