static inline int send_sf(struct isotp_send_ctx *ctx)
{
	struct can_frame frame = {
		.flags = ctx->tx_addr.ide != 0 ? CAN_FRAME_IDE : 0,
		.id = ctx->tx_addr.ext_id
	};
	size_t len = get_ctx_data_length(ctx);
	int index = 0;
	int ret;
	const uint8_t *data;

	data = get_data_ctx(ctx);
	pull_data_ctx(ctx, len);

	if (ctx->tx_addr.use_ext_addr) {
		frame.data[index++] = ctx->tx_addr.ext_addr;
	}

	frame.data[index++] = ISOTP_PCI_TYPE_SF | len;

	__ASSERT_NO_MSG(len <= ISOTP_CAN_DL - index);
	memcpy(&frame.data[index], data, len); /* VULN */

#ifdef CONFIG_ISOTP_ENABLE_TX_PADDING
	/* AUTOSAR requirement SWS_CanTp_00348 */
	memset(&frame.data[index + len], 0xCC, ISOTP_CAN_DL - len - index);
	frame.dlc = ISOTP_CAN_DL;
#else
	frame.dlc = len + index;
#endif

	ctx->state = ISOTP_TX_SEND_SF;
	ret = can_send(ctx->can_dev, &frame, K_MSEC(ISOTP_A),
		       send_can_tx_cb, ctx);
	return ret;
}