Restructure some files in LB to src/vnet to reuse
Change-Id: Ic8b193e93ce18ca82b294816aa7ee0ef31d64bc2
Signed-off-by: Pierre Pfister <ppfister@cisco.com>
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
diff --git a/src/vnet/util/refcount.c b/src/vnet/util/refcount.c
new file mode 100644
index 0000000..a7b525d
--- /dev/null
+++ b/src/vnet/util/refcount.c
@@ -0,0 +1,46 @@
+/*
+ * 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 <vnet/util/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);
+ vlib_refcount_lock(per_cpu->counter_lock);
+ memcpy(new_counter, per_cpu->counters, vec_len(per_cpu->counters)*4);
+ old_counter = per_cpu->counters;
+ per_cpu->counters = new_counter;
+ vlib_refcount_unlock(per_cpu->counter_lock);
+ CLIB_MEMORY_BARRIER();
+ 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 thread_index;
+ for (thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++) {
+ vlib_refcount_lock(r->per_cpu[thread_index].counter_lock);
+ if (index < vec_len(r->per_cpu[thread_index].counters))
+ {
+ count += r->per_cpu[thread_index].counters[index];
+ }
+ vlib_refcount_unlock(r->per_cpu[thread_index].counter_lock);
+ }
+ return count;
+}
+
diff --git a/src/vnet/util/refcount.h b/src/vnet/util/refcount.h
new file mode 100644
index 0000000..ea92148
--- /dev/null
+++ b/src/vnet/util/refcount.h
@@ -0,0 +1,95 @@
+/*
+ * 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.
+ */
+
+/*
+ * vlib provides lock-free counters but those
+ * - Have 16bits per-CPU counter, which may overflow.
+ * - Would only increment.
+ *
+ * This is very similar to vlib counters, but may be used to count reference.
+ * Such a counter includes an arbitrary number of counters. Each counter
+ * is identified by its index. This is used to aggregate per-cpu memory.
+ *
+ * Warning:
+ * This reference counter is lock-free but is not race-condition free.
+ * The counting result is approximate and another mechanism needs to be used
+ * in order to ensure that an object may be freed.
+ *
+ */
+
+#include <vnet/vnet.h>
+
+/*
+ * Reference counting
+ * A specific reference counter is used. The design is quite
+ * similar to vlib counters but:
+ * - It is possible to decrease the value
+ * - Summing will not zero the per-thread counters
+ * - Only the thread can reallocate its own counters vector (to avoid concurrency issues)
+*/
+typedef struct {
+ u32 *counters;
+ volatile u32 *counter_lock;
+ CLIB_CACHE_LINE_ALIGN_MARK(o);
+} vlib_refcount_per_cpu_t;
+
+typedef struct {
+ vlib_refcount_per_cpu_t *per_cpu;
+} vlib_refcount_t;
+
+static_always_inline
+void vlib_refcount_lock (volatile u32 *counter_lock)
+{
+ while (__sync_lock_test_and_set (counter_lock, 1))
+ ;
+}
+
+static_always_inline
+void vlib_refcount_unlock (volatile u32 *counter_lock)
+{
+ *counter_lock = 0;
+}
+
+void __vlib_refcount_resize(vlib_refcount_per_cpu_t *per_cpu, u32 size);
+
+static_always_inline
+void vlib_refcount_add(vlib_refcount_t *r, u32 thread_index, u32 counter_index, i32 v)
+{
+ vlib_refcount_per_cpu_t *per_cpu = &r->per_cpu[thread_index];
+ if (PREDICT_FALSE(counter_index >= vec_len(per_cpu->counters)))
+ __vlib_refcount_resize(per_cpu, clib_max(counter_index + 16,(vec_len(per_cpu->counters)) * 2));
+
+ per_cpu->counters[counter_index] += v;
+}
+
+u64 vlib_refcount_get(vlib_refcount_t *r, u32 index);
+
+static_always_inline
+void vlib_refcount_init(vlib_refcount_t *r)
+{
+ vlib_thread_main_t *tm = vlib_get_thread_main ();
+ u32 thread_index;
+ r->per_cpu = 0;
+ vec_validate (r->per_cpu, tm->n_vlib_mains - 1);
+
+ for (thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++)
+ {
+ r->per_cpu[thread_index].counter_lock =
+ clib_mem_alloc_aligned(CLIB_CACHE_LINE_BYTES,CLIB_CACHE_LINE_BYTES);
+ r->per_cpu[thread_index].counter_lock[0] = 0;
+ }
+}
+
+