net: core: add IFLA_STATS64 support

`ip -s link` shows interface counters truncated to 32 bit. This is
because interface statistics are transported only in 32-bit quantity
to userspace. This commit adds a new IFLA_STATS64 attribute that
exports them in full 64 bit.

References: http://lkml.indiana.edu/hypermail/linux/kernel/0307.3/0215.html
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 1 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4568120d8533..e1121f0bca6a 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -600,7 +600,39 @@ static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 
         a->rx_compressed = b->rx_compressed;
         a->tx_compressed = b->tx_compressed;
-};
+}
+
+static void copy_rtnl_link_stats64(struct rtnl_link_stats64 *a,
+                                   const struct net_device_stats *b)
+{
+        a->rx_packets = b->rx_packets;
+        a->tx_packets = b->tx_packets;
+        a->rx_bytes = b->rx_bytes;
+        a->tx_bytes = b->tx_bytes;
+        a->rx_errors = b->rx_errors;
+        a->tx_errors = b->tx_errors;
+        a->rx_dropped = b->rx_dropped;
+        a->tx_dropped = b->tx_dropped;
+
+        a->multicast = b->multicast;
+        a->collisions = b->collisions;
+
+        a->rx_length_errors = b->rx_length_errors;
+        a->rx_over_errors = b->rx_over_errors;
+        a->rx_crc_errors = b->rx_crc_errors;
+        a->rx_frame_errors = b->rx_frame_errors;
+        a->rx_fifo_errors = b->rx_fifo_errors;
+        a->rx_missed_errors = b->rx_missed_errors;
+
+        a->tx_aborted_errors = b->tx_aborted_errors;
+        a->tx_carrier_errors = b->tx_carrier_errors;
+        a->tx_fifo_errors = b->tx_fifo_errors;
+        a->tx_heartbeat_errors = b->tx_heartbeat_errors;
+        a->tx_window_errors = b->tx_window_errors;
+
+        a->rx_compressed = b->rx_compressed;
+        a->tx_compressed = b->tx_compressed;
+}
 
 static inline int rtnl_vfinfo_size(const struct net_device *dev)
 {
@@ -698,6 +730,14 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
         stats = dev_get_stats(dev);
         copy_rtnl_link_stats(nla_data(attr), stats);
 
+        attr = nla_reserve(skb, IFLA_STATS64,
+                        sizeof(struct rtnl_link_stats64));
+        if (attr == NULL)
+                goto nla_put_failure;
+
+        stats = dev_get_stats(dev);
+        copy_rtnl_link_stats64(nla_data(attr), stats);
+
         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
                 int i;
                 struct ifla_vf_info ivi;