rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats
Many commonly used functions like getifaddrs() invoke RTM_GETLINK
to dump the interface information, and do not need the
the AF_INET6 statististics that are always returned by default
from rtnl_fill_ifinfo().
Computing the statistics can be an expensive operation that impacts
scaling, so it is desirable to avoid this if the information is
not needed.
This patch adds a the RTEXT_FILTER_SKIP_STATS extended info flag that
can be passed with netlink_request() to avoid statistics computation
for the ifinfo path.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a466821..e545229 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1272,7 +1272,7 @@
if (!(af = nla_nest_start(skb, af_ops->family)))
goto nla_put_failure;
- err = af_ops->fill_link_af(skb, dev);
+ err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
/*
* Caller may return ENODATA to indicate that there