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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>
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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3
include/net/rtnetlink.h
View File

@ -122,7 +122,8 @@ struct rtnl_af_ops {
int family;
int (*fill_link_af)(struct sk_buff *skb,
const struct net_device *dev);
const struct net_device *dev,
u32 ext_filter_mask);
size_t (*get_link_af_size)(const struct net_device *dev);
int (*validate_link_af)(const struct net_device *dev,

1
include/uapi/linux/rtnetlink.h
View File

@ -667,6 +667,7 @@ struct tcamsg {
#define RTEXT_FILTER_VF (1 << 0)
#define RTEXT_FILTER_BRVLAN (1 << 1)
#define RTEXT_FILTER_BRVLAN_COMPRESSED (1 << 2)
#define RTEXT_FILTER_SKIP_STATS (1 << 3)
/* End of information exported to user level */

2
net/core/rtnetlink.c
View File

@ -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

3
net/ipv4/devinet.c
View File

@ -1654,7 +1654,8 @@ static size_t inet_get_link_af_size(const struct net_device *dev)
return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
}
static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
u32 ext_filter_mask)
{
struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
struct nlattr *nla;

13
net/ipv6/addrconf.c
View File

@ -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);