bluetooth: controller: Configurable maximum page for Extended Feature Set

This configurations allows decreasing the memory requirements of the
LE Extended Feature Set controller feature by limiting the number of
feature pages stored in the controller.

Signed-off-by: Aleksandar Stanoev <[email protected]>

Author: alexstanoev-nordic

subsys/bluetooth/controller/Kconfig

@@ -538,6 +538,18 @@ config BT_CTLR_SDC_CIS_SUBEVENT_LENGTH_US
 config BT_CTLR_EXTENDED_FEAT_SET
 	select EXPERIMENTAL
 
+config BT_CTLR_SDC_EXTENDED_FEAT_MAX_REMOTE_PAGE
+	int "Number of supported remote feature pages"
+	depends on BT_CTLR_EXTENDED_FEAT_SET
+	range 1 10
+	default BT_LE_LOCAL_MINIMUM_REQUIRED_FEATURE_PAGE if BT_LE_LOCAL_MINIMUM_REQUIRED_FEATURE_PAGE > 0
+	default 1
+	help
+	  Configures the maximum number of remote Extended Feature Set feature pages
+	  that can be stored inside the controller. This value also sets the maximum
+	  page that will be requested by the HCI_LE_Read_All_Remote_Features command.
+	  Each feature page requires approximately 24 bytes of RAM per link.
+
 config BT_CTLR_FRAME_SPACE_UPDATE
 	select EXPERIMENTAL
 

subsys/bluetooth/controller/hci_driver.c

@@ -206,8 +206,15 @@ BUILD_ASSERT(!IS_ENABLED(CONFIG_BT_PERIPHERAL) ||
 #endif
 
 #if defined(CONFIG_BT_CTLR_EXTENDED_FEAT_SET)
-#define SDC_EXTENDED_FEAT_SET_MEM_SIZE \
-	SDC_MEM_EXTENDED_FEATURE_SET(SDC_CENTRAL_COUNT + PERIPHERAL_COUNT)
+#if defined(SDC_MEM_EXTENDED_FEATURE_SET_NEW)
+#define SDC_EXTENDED_FEAT_SET_MEM_SIZE                                                             \
+	SDC_MEM_EXTENDED_FEATURE_SET_NEW(SDC_CENTRAL_COUNT + PERIPHERAL_COUNT,                     \
+					 CONFIG_BT_CTLR_SDC_EXTENDED_FEAT_MAX_REMOTE_PAGE)
+#else
+#define SDC_EXTENDED_FEAT_SET_MEM_SIZE                                                             \
+	SDC_MEM_EXTENDED_FEATURE_SET(SDC_CENTRAL_COUNT + PERIPHERAL_COUNT,                         \
+				     CONFIG_BT_CTLR_SDC_EXTENDED_FEAT_MAX_REMOTE_PAGE)
+#endif
 #else
 #define SDC_EXTENDED_FEAT_SET_MEM_SIZE 0
 #endif
@@ -1365,8 +1372,16 @@ static int configure_memory_usage(void)
 	}
 #endif
 
-	LOG_DBG("BT mempool size: %zu, required: %u",
-	       sizeof(sdc_mempool), required_memory);
+#if defined(CONFIG_BT_CTLR_SDC_EXTENDED_FEAT_MAX_REMOTE_PAGE)
+	cfg.extended_feature_page_count = CONFIG_BT_CTLR_SDC_EXTENDED_FEAT_MAX_REMOTE_PAGE;
+	required_memory = sdc_cfg_set(SDC_DEFAULT_RESOURCE_CFG_TAG,
+				      SDC_CFG_TYPE_EXTENDED_FEATURE_PAGE_COUNT, &cfg);
+	if (required_memory < 0) {
+		return required_memory;
+	}
+#endif
+
+	LOG_DBG("BT mempool size: %zu, required: %u", sizeof(sdc_mempool), required_memory);
 
 	if (required_memory > sizeof(sdc_mempool)) {
 		LOG_ERR("Allocated memory too low: %zu < %u",