sfc: suppress ENOENT error messages from MC_CMD_MAC_STATS

MC_CMD_MAC_STATS can be called on a function before a
vadaptor has been created, as the kernel can call into this
through ndo_get_stats/ndo_get_stats64.

If MC_CMD_MAC_STATS is called before the DMA queues have been
setup, so that a vadaptor has not been created yet, firmware
will return ENOENT. This is expected, so suppress the MCDI
error message in this case.

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef10.c

@@ -1316,11 +1316,16 @@ static int efx_ef10_try_update_nic_stats_vf(struct efx_nic *efx)
 	MCDI_SET_DWORD(inbuf, MAC_STATS_IN_PORT_ID, EVB_PORT_ID_ASSIGNED);
 
 	spin_unlock_bh(&efx->stats_lock);
-	rc = efx_mcdi_rpc(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf), NULL,
-			  0, NULL);
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
+				NULL, 0, NULL);
 	spin_lock_bh(&efx->stats_lock);
-	if (rc)
+	if (rc) {
+		/* Expect ENOENT if DMA queues have not been set up */
+		if (rc != -ENOENT || atomic_read(&efx->active_queues))
+			efx_mcdi_display_error(efx, MC_CMD_MAC_STATS,
+					       sizeof(inbuf), NULL, 0, rc);
 		goto out;
+	}
 
 	generation_end = dma_stats[MC_CMD_MAC_GENERATION_END];
 	if (generation_end == EFX_MC_STATS_GENERATION_INVALID) {

drivers/net/ethernet/sfc/mcdi_port.c

@@ -948,8 +948,12 @@ static int efx_mcdi_mac_stats(struct efx_nic *efx,
 	MCDI_SET_DWORD(inbuf, MAC_STATS_IN_DMA_LEN, dma_len);
 	MCDI_SET_DWORD(inbuf, MAC_STATS_IN_PORT_ID, nic_data->vport_id);
 
-	rc = efx_mcdi_rpc(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
-			  NULL, 0, NULL);
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
+				NULL, 0, NULL);
+	/* Expect ENOENT if DMA queues have not been set up */
+	if (rc && (rc != -ENOENT || atomic_read(&efx->active_queues)))
+		efx_mcdi_display_error(efx, MC_CMD_MAC_STATS, sizeof(inbuf),
+				       NULL, 0, rc);
 	return rc;
 }