def express_aer()

in pci_lib/pci_lib.py [0:0]

• 19 lines of code
• 6 McCabe index (conditional complexity)

    def express_aer(self):
        """
        Retrieve the device's PCIe Advanced Error Reporting (AER) statistics,
        if the device is AER capable and the kernel provides the corresponding
        pseudo fs interface under /sys/bus/pci/devices/.  The information is
        gleaned from the following files, when present:

        For devices:
        /sys/bus/pci/devices/<dev>/aer_dev_correctable
        /sys/bus/pci/devices/<dev>/aer_dev_fatal
        /sys/bus/pci/devices/<dev>/aer_dev_nonfatal

        along with the following for Root Port error counts:
        /sys/bus/pci/devices/<dev>/aer_rootport_total_err_cor
        /sys/bus/pci/devices/<dev>/aer_rootport_total_err_fatal
        /sys/bus/pci/devices/<dev>/aer_rootport_total_err_nonfatal

        Returns a dictionary with device and rootport dictionaries containing
        various key/value pairs or counts provided via the pseudo fs files.
        Empty device/rootport dictionaries are not included and None is
        returned when no AER information has been found.
        """
        if self.express_type is None:
            return None
        aer = {}
        dev_stats = aer_dev_stats(self.device_name, ['aer_dev_correctable',
                                                     'aer_dev_fatal',
                                                     'aer_dev_nonfatal'])
        if dev_stats is not None:
            aer["device"] = dev_stats

        if self.express_type == 'root_port':
            rp_counts = aer_rootport_counts(self.device_name,
                                            ['aer_rootport_total_err_cor',
                                             'aer_rootport_total_err_fatal',
                                             'aer_rootport_total_err_nonfatal'])
            if rp_counts is not None:
                aer["rootport"] = rp_counts
        if len(aer) == 0:
            return None
        return aer