multiple map elements support

Author: varun-r-mallya

examples/c-form/ex3-2.bpf.c

@@ -8,7 +8,7 @@ struct {
     __uint(type, BPF_MAP_TYPE_HASH);
     __type(key, u64);
     __type(value, u64);
-    __uint(max_entries, 1);
+    __uint(max_entries, 4);
 } last SEC(".maps");
 
 // Handler for syscall entry

examples/execve3.py

@@ -8,7 +8,7 @@
 @bpf
 @map
 def last() -> HashMap:
-    return HashMap(key_type=c_uint64, value_type=c_uint64, max_entries=1)
+    return HashMap(key_type=c_uint64, value_type=c_uint64, max_entries=3)
 
 
 @bpf
@@ -37,7 +37,13 @@ def hello_again(ctx: c_void_p) -> c_int64:
     if x:
         print("we did not prevail")
     ts = ktime()
-    last().update(key, ts, 0)
+    last().update(key, ts)
+    keys = 2
+    last().update(keys, ts)
+    key = 4
+    last().update(key, ts)
+    key = 5
+    last().update(key, ts)
     return c_int64(0)
 
 

pythonbpf/maps_pass.py

@@ -74,6 +74,14 @@ def create_map_debug_info(module, map_global, map_name, map_params):
         "size": 32,
         "elements": [array_subrange]
     })
+    
+    array_subrange_max_entries = module.add_debug_info("DISubrange", {"count": map_params["max_entries"]})
+    array_type_max_entries = module.add_debug_info("DICompositeType", {
+        "tag": dc.DW_TAG_array_type,
+        "baseType": uint_type,
+        "size": 32,
+        "elements": [array_subrange_max_entries]
+    })
 
     # Create pointer types
     type_ptr = module.add_debug_info("DIDerivedType", {
@@ -84,7 +92,7 @@ def create_map_debug_info(module, map_global, map_name, map_params):
 
     max_entries_ptr = module.add_debug_info("DIDerivedType", {
         "tag": dc.DW_TAG_pointer_type,
-        "baseType": array_type,
+        "baseType": array_type_max_entries,
         "size": 64
     })