[PATCH net-next] ibmvnic: Improve output for unsupported stats

[John Allen]

The vnic server can report -1 in the event that a given statistic is not
supported. Currently, the -1 value is implicitly cast to an unsigned
integer and appears through the ethtool -S output as a very large number.
This patch improves this behavior by reporting 0 in the event that a
given statistic is not supported.

Signed-off-by: John Allen <jal...@linux.vnet.ibm.com>
---
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c 
b/drivers/net/ethernet/ibm/ibmvnic.c
index cb8182f..b8ad2db 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1862,6 +1862,7 @@ static void ibmvnic_get_ethtool_stats(struct net_device 
*dev,
 {
        struct ibmvnic_adapter *adapter = netdev_priv(dev);
        union ibmvnic_crq crq;
+       u64 stat;
        int i, j;

        memset(&crq, 0, sizeof(crq));
@@ -1876,9 +1877,11 @@ static void ibmvnic_get_ethtool_stats(struct net_device 
*dev,
        ibmvnic_send_crq(adapter, &crq);
        wait_for_completion(&adapter->stats_done);

-       for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
-               data[i] = be64_to_cpu(IBMVNIC_GET_STAT(adapter,
-                                               ibmvnic_stats[i].offset));
+       for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++) {
+               stat = be64_to_cpu(IBMVNIC_GET_STAT(adapter,
+                                                   ibmvnic_stats[i].offset));
+               data[i] = stat == -1 ? 0 : stat;
+       }

        for (j = 0; j < adapter->req_tx_queues; j++) {
                data[i] = adapter->tx_stats_buffers[j].packets;