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authorDave Barach <dave@barachs.net>2017-08-29 11:43:37 -0400
committerDamjan Marion <dmarion.lists@gmail.com>2017-09-01 14:17:53 +0000
commitb7f1faa7fbd4575f28766e552a73810c6de0ace3 (patch)
tree30343f8b6f4778250bd2bcb0d123aedfd7d8c172 /src/vppinfra/pool.c
parent774b217916ff34ea4ba89d117e93e5b3dd68276f (diff)
Add fixed-size, preallocated pool support
Simply call pool_init_fixed(...) before using the pool. Note that fixed, preallocated pools live in individually-mmap'ed address segments, except for the free element bitmap. A large fixed pool can exceed 4gb. Fix tcp buffer allocator leak, remove broken assert Change-Id: I4421082e12a77c41c6e20f7747f3150dcd01fc26 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vppinfra/pool.c')
-rw-r--r--src/vppinfra/pool.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/vppinfra/pool.c b/src/vppinfra/pool.c
new file mode 100644
index 00000000000..ed83b41afef
--- /dev/null
+++ b/src/vppinfra/pool.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2017 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) 2001, 2002, 2003, 2004 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/pool.h>
+
+void
+_pool_init_fixed (void **pool_ptr, u32 elt_size, u32 max_elts)
+{
+ u8 *mmap_base;
+ u64 vector_size;
+ u64 free_index_size;
+ u64 total_size;
+ u64 page_size;
+ pool_header_t *fh;
+ vec_header_t *vh;
+ u8 *v;
+ u32 *fi;
+ u32 i;
+ u32 set_bits;
+
+ ASSERT (elt_size);
+ ASSERT (max_elts);
+
+ vector_size = pool_aligned_header_bytes + vec_header_bytes (0)
+ + (u64) elt_size *max_elts;
+
+ free_index_size = vec_header_bytes (0) + sizeof (u32) * max_elts;
+
+ /* Round up to a cache line boundary */
+ vector_size = (vector_size + CLIB_CACHE_LINE_BYTES - 1)
+ & ~(CLIB_CACHE_LINE_BYTES - 1);
+
+ free_index_size = (free_index_size + CLIB_CACHE_LINE_BYTES - 1)
+ & ~(CLIB_CACHE_LINE_BYTES - 1);
+
+ total_size = vector_size + free_index_size;
+
+ /* Round up to an even number of pages */
+ page_size = clib_mem_get_page_size ();
+ total_size = (total_size + page_size - 1) & ~(page_size - 1);
+
+ /* mmap demand zero memory */
+
+ mmap_base = mmap (0, total_size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ if (mmap_base == MAP_FAILED)
+ {
+ clib_unix_warning ("mmap");
+ *pool_ptr = 0;
+ }
+
+ /* First comes the pool header */
+ fh = (pool_header_t *) mmap_base;
+ /* Find the user vector pointer */
+ v = (u8 *) (mmap_base + pool_aligned_header_bytes);
+ /* Finally, the vector header */
+ vh = _vec_find (v);
+
+ fh->free_bitmap = 0; /* No free elts (yet) */
+ fh->max_elts = max_elts;
+ fh->mmap_base = mmap_base;
+ fh->mmap_size = total_size;
+
+ vh->len = max_elts;
+
+ /* Build the free-index vector */
+ vh = (vec_header_t *) (v + vector_size);
+ vh->len = max_elts;
+ fi = (u32 *) (vh + 1);
+
+ fh->free_indices = fi;
+
+ /* Set the entire free bitmap */
+ clib_bitmap_alloc (fh->free_bitmap, max_elts);
+ memset (fh->free_bitmap, 0xff, vec_len (fh->free_bitmap) * sizeof (uword));
+
+ /* Clear any extraneous set bits */
+ set_bits = vec_len (fh->free_bitmap) * BITS (uword);
+
+ for (i = max_elts; i < set_bits; i++)
+ fh->free_bitmap = clib_bitmap_set (fh->free_bitmap, i, 0);
+
+ /* Create the initial free vector */
+ for (i = 0; i < max_elts; i++)
+ fi[i] = (max_elts - 1) - i;
+
+ *pool_ptr = v;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */