GLDv3 Network Statistics

Device drivers maintain a set of statistics for the device instances they manage. The MAC layer queries these statistics through the mc_getstat(9E) entry point of the driver.

int mc_getstat(void *driver_handle, uint_t stat, uint64_t *stat_value);

The GLDv3 framework uses stat to specify the statistic being queried. The driver uses stat_value to return the value of the statistic specified by stat. If the value of the statistic is returned, mc_getstat() must return 0. If the stat statistic is not supported by the driver, mc_getstat() must return ENOTSUP.

The GLDv3 statistics that are supported are the union of generic MAC statistics and Ethernet-specific statistics. See the mc_getstat(9E) man page for a complete list of supported statistics.

int
xx_m_getstat(void *arg, uint_t stat, uint64_t *val)
{
        xx_t    *xxp = arg;

        mutex_enter(&xxp->xx_xmtlock);
        if ((xxp->xx_flags & (XX_RUNNING|XX_SUSPENDED)) == XX_RUNNING)
                xx_reclaim(xxp);
        mutex_exit(&xxp->xx_xmtlock);

        switch (stat) {
        case MAC_STAT_MULTIRCV:
                *val = xxp->xx_multircv;
                break;
        /* ... */
        case ETHER_STAT_MACRCV_ERRORS:
                *val = xxp->xx_macrcv_errors;
                break;
        /* ... */
        default:
                return (ENOTSUP);
        }
        return (0);
}

The mri_stat() ring entry point is a mandatory ring entry point that must be implemented by all the device drivers that support rings capability. This entry point will be used by the framework to query the statistics maintained for each of the hardware transmit and receive rings.

For the hardware transmit rings, the framework queries the following statistics:

• MAC_STAT_OERRORS

• MAC_STAT_OBYTES

• MAC_STAT_OPACKETS

For the hardware receive rings, the framework queries the following statistics:

• MAC_STAT_IERRORS

• MAC_STAT_RBYTES

• MAC_STAT_IPACKETS