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net: rtnetlink: add linkxstats callbacks and attribute

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Add callbacks to calculate the size and fill link extended statistics
which can be split into multiple messages and are dumped via the new
rtnl stats API (RTM_GETSTATS) with the IFLA_STATS_LINK_XSTATS attribute.
Also add that attribute to the idx mask check since it is expected to
be able to save state and resume dumping (e.g. future bridge per-vlan
stats will be dumped via this attribute and callbacks).
Each link type should nest its private attributes under the per-link type
attribute. This allows to have any number of separated private attributes
and to avoid one call to get the dev link type.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2016-04-30 10:25:27 +02:00 committed by David S. Miller
parent e8872a25a0
commit 97a47facf3
3 changed files with 49 additions and 0 deletions
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7
include/net/rtnetlink.h
View file

@ -47,6 +47,9 @@ static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
* @get_num_rx_queues: Function to determine number of receive queues
* to create when creating a new device.
* @get_link_net: Function to get the i/o netns of the device
* @get_linkxstats_size: Function to calculate the required room for
* dumping device-specific extended link stats
* @fill_linkxstats: Function to dump device-specific extended link stats
*/
struct rtnl_link_ops {
struct list_head list;
@ -95,6 +98,10 @@ struct rtnl_link_ops {
const struct net_device *dev,
const struct net_device *slave_dev);
struct net *(*get_link_net)(const struct net_device *dev);
size_t (*get_linkxstats_size)(const struct net_device *dev);
int (*fill_linkxstats)(struct sk_buff *skb,
const struct net_device *dev,
int *prividx);
};
int __rtnl_link_register(struct rtnl_link_ops *ops);

12
include/uapi/linux/if_link.h
View file

@ -810,6 +810,7 @@ struct if_stats_msg {
enum {
IFLA_STATS_UNSPEC, /* also used as 64bit pad attribute */
IFLA_STATS_LINK_64,
IFLA_STATS_LINK_XSTATS,
__IFLA_STATS_MAX,
};
@ -817,4 +818,15 @@ enum {
#define IFLA_STATS_FILTER_BIT(ATTR) (1 << (ATTR - 1))
/* These are embedded into IFLA_STATS_LINK_XSTATS:
* [IFLA_STATS_LINK_XSTATS]
* -> [LINK_XSTATS_TYPE_xxx]
* -> [rtnl link type specific attributes]
*/
enum {
LINK_XSTATS_TYPE_UNSPEC,
__LINK_XSTATS_TYPE_MAX
};
#define LINK_XSTATS_TYPE_MAX (__LINK_XSTATS_TYPE_MAX - 1)
#endif /* _UAPI_LINUX_IF_LINK_H */

30
net/core/rtnetlink.c
View file

@ -3483,6 +3483,26 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
dev_get_stats(dev, sp);
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
if (ops && ops->fill_linkxstats) {
int err;
*idxattr = IFLA_STATS_LINK_XSTATS;
attr = nla_nest_start(skb,
IFLA_STATS_LINK_XSTATS);
if (!attr)
goto nla_put_failure;
err = ops->fill_linkxstats(skb, dev, prividx);
nla_nest_end(skb, attr);
if (err)
goto nla_put_failure;
*idxattr = 0;
}
}
nlmsg_end(skb, nlh);
return 0;
@ -3509,6 +3529,16 @@ static size_t if_nlmsg_stats_size(const struct net_device *dev,
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
if (ops && ops->get_linkxstats_size) {
size += nla_total_size(ops->get_linkxstats_size(dev));
/* for IFLA_STATS_LINK_XSTATS */
size += nla_total_size(0);
}
}
return size;
}