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| author | Sowmini Varadhan | 2015-09-11 22:48:48 +0200 |
|---|---|---|
| committer | David S. Miller | 2015-09-16 00:25:02 +0200 |
| commit | d5566fd72ec1924958fcfd48b65c022c8f7eae64 (patch) | |
| tree | fb7c5e29238657e89d33320091d8b8ae3d5f78e9 /net/ipv6/addrconf.c | |
| parent | cdc: Fix build warning. (diff) | |
| download | kernel-qcow2-linux-d5566fd72ec1924958fcfd48b65c022c8f7eae64.tar.gz kernel-qcow2-linux-d5566fd72ec1924958fcfd48b65c022c8f7eae64.tar.xz kernel-qcow2-linux-d5566fd72ec1924958fcfd48b65c022c8f7eae64.zip | |
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>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 030fefdc9aed..75d3dde32c69 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4729,7 +4729,8 @@ static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, } } -static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) +static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, + u32 ext_filter_mask) { struct nlattr *nla; struct ifla_cacheinfo ci; @@ -4749,6 +4750,9 @@ static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) /* XXX - MC not implemented */ + if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) + return 0; + nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); if (!nla) goto nla_put_failure; @@ -4784,14 +4788,15 @@ static size_t inet6_get_link_af_size(const struct net_device *dev) return inet6_ifla6_size(); } -static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) +static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, + u32 ext_filter_mask) { struct inet6_dev *idev = __in6_dev_get(dev); if (!idev) return -ENODATA; - if (inet6_fill_ifla6_attrs(skb, idev) < 0) + if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) return -EMSGSIZE; return 0; @@ -4946,7 +4951,7 @@ static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, if (!protoinfo) goto nla_put_failure; - if (inet6_fill_ifla6_attrs(skb, idev) < 0) + if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) goto nla_put_failure; nla_nest_end(skb, protoinfo); |