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.

Example 19–7 The mc_getstat() Entry Point

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);
}