- /* Update MAC stats using periodic DMA.
- * Common code always uses 1000ms update period, so period_ms
- * parameter only needs to be non-zero to start updates.
- */
- sfc_log_init(sa, "request MAC stats DMA'ing");
- rc = efx_mac_stats_periodic(sa->nic, &port->mac_stats_dma_mem,
- 1000, B_FALSE);
- if (rc != 0)
- goto fail_mac_stats_periodic;
+ for (i = 0, port->mac_stats_nb_supported = 0; i < EFX_MAC_NSTATS; ++i)
+ if (EFX_MAC_STAT_SUPPORTED(port->mac_stats_mask, i))
+ port->mac_stats_nb_supported++;
+
+ port->mac_stats_update_generation = 0;
+
+ if (port->mac_stats_update_period_ms != 0) {
+ /*
+ * Update MAC stats using periodic DMA;
+ * any positive update interval different from
+ * 1000 ms can be set only on SFN8xxx provided
+ * that FW version is 6.2.1.1033 or higher
+ */
+ sfc_log_init(sa, "request MAC stats DMA'ing");
+ rc = efx_mac_stats_periodic(sa->nic, &port->mac_stats_dma_mem,
+ port->mac_stats_update_period_ms,
+ B_FALSE);
+ if (rc == 0) {
+ port->mac_stats_periodic_dma_supported = B_TRUE;
+ } else if (rc == EOPNOTSUPP) {
+ port->mac_stats_periodic_dma_supported = B_FALSE;
+ port->mac_stats_last_request_timestamp = 0;
+ } else {
+ goto fail_mac_stats_periodic;
+ }
+ }
+
+ if ((port->mac_stats_update_period_ms != 0) &&
+ port->mac_stats_periodic_dma_supported) {
+ /*
+ * Request an explicit MAC stats upload immediately to
+ * preclude bogus figures readback if the user decides
+ * to read stats before periodic DMA is really started
+ */
+ rc = efx_mac_stats_upload(sa->nic, &port->mac_stats_dma_mem);
+ if (rc != 0)
+ goto fail_mac_stats_upload;
+ }