acl-plugin: avoid crash in multithreaded setup adding/deleting ACLs with traffic (VPP-910/VPP-929)

The commit fixing the VPP-910 and separating the memory operations
into separate heaps has missed setting the MHEAP_FLAG_THREAD_SAFE,
which quite obviously caused the issues in the multithread setup.
Fix that.

Also, add the debug CLIs
"set acl-plugin heap {main|hash} {validate|trace} {1|0}"
to toggle the memory instrumentation, in case we ever need it
in the future.

Change-Id: I8bd4f7978613f5ea75a030cfb90674dac34ae7bf
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
(cherry picked from commit e6423bef32ca2ffcfcd7a092eb4673badd53ea4c)

1 files changed, 29 insertions, 0 deletions

diff --git a/src/plugins/acl/hash_lookup.c b/src/plugins/acl/hash_lookup.c
index a337eb84586..ae522d921cc 100644
--- a/src/plugins/acl/hash_lookup.c
+++ b/src/plugins/acl/hash_lookup.c
@@ -269,12 +269,41 @@ hash_acl_set_heap(acl_main_t *am)
 {
   if (0 == am->hash_lookup_mheap) {
     am->hash_lookup_mheap = mheap_alloc (0 /* use VM */ , 2 << 25);
+    mheap_t *h = mheap_header (am->hash_lookup_mheap);
+    h->flags |= MHEAP_FLAG_THREAD_SAFE;
   }
   void *oldheap = clib_mem_set_heap(am->hash_lookup_mheap);
   return oldheap;
 }
 
 void
+acl_plugin_hash_acl_set_validate_heap(acl_main_t *am, int on)
+{
+  clib_mem_set_heap(hash_acl_set_heap(am));
+  mheap_t *h = mheap_header (am->hash_lookup_mheap);
+  if (on) {
+    h->flags |= MHEAP_FLAG_VALIDATE;
+    h->flags &= ~MHEAP_FLAG_SMALL_OBJECT_CACHE;
+    mheap_validate(h);
+  } else {
+    h->flags &= ~MHEAP_FLAG_VALIDATE;
+    h->flags |= MHEAP_FLAG_SMALL_OBJECT_CACHE;
+  }
+}
+
+void
+acl_plugin_hash_acl_set_trace_heap(acl_main_t *am, int on)
+{
+  clib_mem_set_heap(hash_acl_set_heap(am));
+  mheap_t *h = mheap_header (am->hash_lookup_mheap);
+  if (on) {
+    h->flags |= MHEAP_FLAG_TRACE;
+  } else {
+    h->flags &= ~MHEAP_FLAG_TRACE;
+  }
+}
+
+void
 hash_acl_apply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index)
 {
   int i;