feat(ble/nimble): support runtime allocation for mempool

components/bt/host/nimble/Kconfig.in

@@ -485,6 +485,26 @@ menu "Memory Settings"
         default 1
         help
             This is the service data unit buffer count for l2cap coc.
+
+    config BT_NIMBLE_MEMPOOL_RUNTIME_ALLOC
+        bool "Support on-demand runtime memory allocation for mempool"
+        depends on BT_NIMBLE_ENABLED && !SOC_ESP_NIMBLE_CONTROLLER
+        default n
+        help
+            When this option is enabled, mempool does not require pre-allocating memory.
+            Instead, memory for each block will be dynamically allocated and released
+            during mempool usage. This can significantly reduce memory consumption
+            after mempool initialization, but may have some impact on performance.
+
+    config BT_NIMBLE_MEMPOOL_BLOCK_REUSED
+        bool "Support block reuse for mempool runtime memory allocation"
+        depends on BT_NIMBLE_MEMPOOL_RUNTIME_ALLOC
+        default n
+        help
+            When this option is enabled, dynamically allocated blocks will not be freed
+            but will be reused instead. This ensures virtually no impact on performance
+            while reducing the memory consumption of the mempool.
+
 endmenu #Memory
 
 menu "BLE 5.x Features"

components/bt/host/nimble/esp-hci/src/esp_nimble_hci.c

@@ -96,7 +96,11 @@ int ble_hci_trans_hs_cmd_tx(uint8_t *cmd)
         rc = BLE_HS_ETIMEOUT_HCI;
     }
 
+#if MYNEWT_VAL(MP_RUNTIME_ALLOC)
+    ble_transport_free(BLE_HCI_CMD, cmd);
+#else
     ble_transport_free(cmd);
+#endif
     return rc;
 }
 

components/bt/host/nimble/port/include/esp_nimble_cfg.h

@@ -2214,4 +2214,20 @@
 #endif
 #endif
 
+#ifndef MYNEWT_VAL_MP_RUNTIME_ALLOC
+#ifdef CONFIG_BT_NIMBLE_MEMPOOL_RUNTIME_ALLOC
+#define MYNEWT_VAL_MP_RUNTIME_ALLOC (1)
+#else
+#define MYNEWT_VAL_MP_RUNTIME_ALLOC (0)
+#endif
+#endif
+
+#ifndef MYNEWT_VAL_MP_BLOCK_REUSED
+#ifdef CONFIG_BT_NIMBLE_MEMPOOL_BLOCK_REUSED
+#define MYNEWT_VAL_MP_BLOCK_REUSED (1)
+#else
+#define MYNEWT_VAL_MP_BLOCK_REUSED (0)
+#endif
+#endif
+
 #endif