make number of db entries configurable

Author: paul-szczepanek-arm

features/FEATURE_BLE/ble/generic/FileSecurityDb.h

@@ -34,8 +34,6 @@ class FileSecurityDb : public SecurityDb {
         size_t file_offset;
     };
 
-    static const size_t MAX_ENTRIES = 5;
-
     static entry_t* as_entry(entry_handle_t db_handle) {
         return reinterpret_cast<entry_t*>(db_handle);
     }
@@ -146,7 +144,7 @@ class FileSecurityDb : public SecurityDb {
     static FILE* erase_db_file(FILE* db_file);
 
 private:
-    entry_t _entries[MAX_ENTRIES];
+    entry_t _entries[BLE_SECURITY_DATABASE_MAX_ENTRIES];
     FILE *_db_file;
     uint8_t _buffer[sizeof(SecurityEntryKeys_t)];
 };

features/FEATURE_BLE/ble/generic/MemorySecurityDb.h

@@ -34,8 +34,6 @@ class MemorySecurityDb : public SecurityDb {
         SecurityEntrySigning_t peer_signing;
     };
 
-    static const size_t MAX_ENTRIES = 5;
-
     static entry_t* as_entry(entry_handle_t db_handle)
     {
         return reinterpret_cast<entry_t*>(db_handle);
@@ -150,11 +148,11 @@ class MemorySecurityDb : public SecurityDb {
 
 private:
     virtual uint8_t get_entry_count() {
-        return MAX_ENTRIES;
+        return BLE_SECURITY_DATABASE_MAX_ENTRIES;
     }
 
     virtual SecurityDistributionFlags_t* get_entry_handle_by_index(uint8_t index) {
-        if (index < MAX_ENTRIES) {
+        if (index < BLE_SECURITY_DATABASE_MAX_ENTRIES) {
             return &_entries[index].flags;
         } else {
             return NULL;
@@ -187,7 +185,7 @@ class MemorySecurityDb : public SecurityDb {
     };
 
 private:
-    entry_t _entries[MAX_ENTRIES];
+    entry_t _entries[BLE_SECURITY_DATABASE_MAX_ENTRIES];
 };
 
 } /* namespace pal */

features/FEATURE_BLE/mbed_lib.json

@@ -71,6 +71,11 @@
             "help": "Include periodic advertising support, depends on the extended advertising feature.",
             "value": true,
             "macro_name": "BLE_FEATURE_PERIODIC_ADVERTISING"
+        },
+        "ble-security-database-max-entries": {
+            "help": "How many entries can be stored in the db, depends on security manager.",
+            "value": 5,
+            "macro_name": "BLE_SECURITY_DATABASE_MAX_ENTRIES"
         }
     }
 }

features/FEATURE_BLE/source/generic/FileSecurityDb.cpp

@@ -54,7 +54,7 @@ const uint16_t DB_VERSION = 1;
     )
 
 #define DB_SIZE_STORES \
-    (FileSecurityDb::MAX_ENTRIES * DB_SIZE_STORE)
+    (BLE_SECURITY_DATABASE_MAX_ENTRIES * DB_SIZE_STORE)
 
 #define DB_OFFSET_VERSION          (0)
 #define DB_OFFSET_RESTORE          (DB_OFFSET_VERSION + sizeof(DB_VERSION))
@@ -308,11 +308,11 @@ void FileSecurityDb::set_restore(bool reload) {
 /* helper functions */
 
 uint8_t FileSecurityDb::get_entry_count() {
-    return MAX_ENTRIES;
+    return BLE_SECURITY_DATABASE_MAX_ENTRIES;
 }
 
 SecurityDistributionFlags_t* FileSecurityDb::get_entry_handle_by_index(uint8_t index) {
-    if (index < MAX_ENTRIES) {
+    if (index < BLE_SECURITY_DATABASE_MAX_ENTRIES) {
         return &_entries[index].flags;
     } else {
         return NULL;