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authorPierre Pfister <ppfister@cisco.com>2016-08-04 16:13:09 +0100
committerDave Barach <openvpp@barachs.net>2016-08-11 14:05:40 +0000
commit041eacc81656d2ed5bc01b96b15a7d03a1700f13 (patch)
treef1cded1a27f92bab90fec8e5ea9d991ee2ff7eb5 /plugins/lb-plugin/lb/refcount.c
parent3590ac5881261c95a3c575360e24903d60fac392 (diff)
VPP-130: MagLev-like Load Balancer
This plugin provides load balancing for VPP in a way that is largely inspired from Google's MagLev: http://research.google.com/pubs/pub44824.html More info in the README.md Change-Id: I1223f495d5c2d5200808a398504119f2830337e9 Signed-off-by: Pierre Pfister <ppfister@cisco.com>
Diffstat (limited to 'plugins/lb-plugin/lb/refcount.c')
-rw-r--r--plugins/lb-plugin/lb/refcount.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/plugins/lb-plugin/lb/refcount.c b/plugins/lb-plugin/lb/refcount.c
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+/*
+ * Copyright (c) 2016 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.
+ */
+
+#include <lb/refcount.h>
+
+void __vlib_refcount_resize(vlib_refcount_per_cpu_t *per_cpu, u32 size)
+{
+ u32 *new_counter = 0, *old_counter;
+ vec_validate(new_counter, size);
+ memcpy(new_counter, per_cpu->counters, per_cpu->length);
+ old_counter = per_cpu->counters;
+ per_cpu->counters = new_counter;
+ CLIB_MEMORY_BARRIER();
+ per_cpu->length = vec_len(new_counter);
+ vec_free(old_counter);
+}
+
+u64 vlib_refcount_get(vlib_refcount_t *r, u32 index)
+{
+ u64 count = 0;
+ vlib_thread_main_t *tm = vlib_get_thread_main ();
+ u32 cpu_index;
+ for (cpu_index = 0; cpu_index < tm->n_vlib_mains; cpu_index++) {
+ if (r->per_cpu[cpu_index].length > index)
+ count += r->per_cpu[cpu_index].counters[index];
+ }
+ return count;
+}
+