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rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats

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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>
This commit is contained in:
Sowmini Varadhan
2015-09-11 16:48:48 -04:00
committed by David S. Miller
parent ad1e7b97b3
commit d5566fd72e
5 changed files with 15 additions and 7 deletions
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2
net/core/rtnetlink.c
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@@ -1272,7 +1272,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
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