[PATCH net-next] rtnetlink: rtnl_fill_stats: avoid an unnecssary stats copy

[Roopa Prabhu]

From: Roopa Prabhu <ro...@cumulusnetworks.com>

This patch passes netlink attr data ptr directly to dev_get_stats
thus elimiating a stats copy.

Suggested-by: David Miller <da...@davemloft.net>
Signed-off-by: Roopa Prabhu <ro...@cumulusnetworks.com>
---
 net/core/rtnetlink.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a75f7e9..a7a3d34 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -808,11 +808,6 @@ static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
        a->rx_nohandler = b->rx_nohandler;
 }
 
-static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
-{
-       memcpy(v, b, sizeof(*b));
-}
-
 /* All VF info */
 static inline int rtnl_vfinfo_size(const struct net_device *dev,
                                   u32 ext_filter_mask)
@@ -1054,25 +1049,23 @@ static int rtnl_phys_switch_id_fill(struct sk_buff 
*skb, struct net_device *dev)
 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
                                              struct net_device *dev)
 {
-       const struct rtnl_link_stats64 *stats;
-       struct rtnl_link_stats64 temp;
+       struct rtnl_link_stats64 *sp;
        struct nlattr *attr;
 
-       stats = dev_get_stats(dev, &temp);
-
-       attr = nla_reserve(skb, IFLA_STATS,
-                          sizeof(struct rtnl_link_stats));
+       attr = nla_reserve(skb, IFLA_STATS64,
+                          sizeof(struct rtnl_link_stats64));
        if (!attr)
                return -EMSGSIZE;
 
-       copy_rtnl_link_stats(nla_data(attr), stats);
+       sp = nla_data(attr);
+       dev_get_stats(dev, sp);
 
-       attr = nla_reserve(skb, IFLA_STATS64,
-                          sizeof(struct rtnl_link_stats64));
+       attr = nla_reserve(skb, IFLA_STATS,
+                          sizeof(struct rtnl_link_stats));
        if (!attr)
                return -EMSGSIZE;
 
-       copy_rtnl_link_stats64(nla_data(attr), stats);
+       copy_rtnl_link_stats(nla_data(attr), sp);
 
        return 0;
 }
-- 
1.9.1