ethtool: add a new command for reading standard stats

Add an interface for reading standard stats, including
stats which don't have a corresponding control interface.

Start with IEEE 802.3 PHY stats. There seems to be only
one stat to expose there.

Define API to not require user space changes when new
stats or groups are added. Groups are based on bitset,
stats have a string set associated.

v1: wrap stats in a nest

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 5f5d7c4b3d4a..290012d0d11d 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -247,6 +247,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 	[ETHTOOL_MSG_FEC_GET]		= &ethnl_fec_request_ops,
 	[ETHTOOL_MSG_TSINFO_GET]	= &ethnl_tsinfo_request_ops,
 	[ETHTOOL_MSG_MODULE_EEPROM_GET]	= &ethnl_module_eeprom_request_ops,
+	[ETHTOOL_MSG_STATS_GET]		= &ethnl_stats_request_ops,
 };
 
 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -942,6 +943,15 @@ static const struct genl_ops ethtool_genl_ops[] = {
 		.policy = ethnl_module_eeprom_get_policy,
 		.maxattr = ARRAY_SIZE(ethnl_module_eeprom_get_policy) - 1,
 	},
+	{
+		.cmd	= ETHTOOL_MSG_STATS_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+		.policy = ethnl_stats_get_policy,
+		.maxattr = ARRAY_SIZE(ethnl_stats_get_policy) - 1,
+	},
 };
 
 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {