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>

2 files changed, 74 insertions, 1 deletions

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index c9bf92cd7653..cfd420ba72df 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -37,6 +37,38 @@ struct rtnl_link_stats {
         __u32   tx_compressed;
 };
 
+struct rtnl_link_stats64 {
+        __u64   rx_packets;             /* total packets received       */
+        __u64   tx_packets;             /* total packets transmitted    */
+        __u64   rx_bytes;               /* total bytes received         */
+        __u64   tx_bytes;               /* total bytes transmitted      */
+        __u64   rx_errors;              /* bad packets received         */
+        __u64   tx_errors;              /* packet transmit problems     */
+        __u64   rx_dropped;             /* no space in linux buffers    */
+        __u64   tx_dropped;             /* no space available in linux  */
+        __u64   multicast;              /* multicast packets received   */
+        __u64   collisions;
+
+        /* detailed rx_errors: */
+        __u64   rx_length_errors;
+        __u64   rx_over_errors;         /* receiver ring buff overflow  */
+        __u64   rx_crc_errors;          /* recved pkt with crc error    */
+        __u64   rx_frame_errors;        /* recv'd frame alignment error */
+        __u64   rx_fifo_errors;         /* recv'r fifo overrun          */
+        __u64   rx_missed_errors;       /* receiver missed packet       */
+
+        /* detailed tx_errors */
+        __u64   tx_aborted_errors;
+        __u64   tx_carrier_errors;
+        __u64   tx_fifo_errors;
+        __u64   tx_heartbeat_errors;
+        __u64   tx_window_errors;
+
+        /* for cslip etc */
+        __u64   rx_compressed;
+        __u64   tx_compressed;
+};
+
 /* The struct should be in sync with struct ifmap */
 struct rtnl_link_ifmap {
         __u64   mem_start;
@@ -83,6 +115,7 @@ enum {
         IFLA_VF_VLAN,
         IFLA_VF_TX_RATE,        /* TX Bandwidth Allocation */
         IFLA_VFINFO,
+        IFLA_STATS64,
         __IFLA_MAX
 };
 
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;