ethtool: add FEATURES_NTF notification

Send ETHTOOL_MSG_FEATURES_NTF notification whenever network device features
are modified using ETHTOOL_MSG_FEATURES_SET netlink message, ethtool ioctl
request or any other way resulting in call to netdev_update_features() or
netdev_change_features()

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index d6706c4..47542f0 100644 (file)
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -208,6 +208,7 @@ Kernel to userspace:
   ``ETHTOOL_MSG_WOL_NTF``               wake-on-lan settings notification
   ``ETHTOOL_MSG_FEATURES_GET_REPLY``    device features
   ``ETHTOOL_MSG_FEATURES_SET_REPLY``    optional reply to FEATURES_SET
+  ``ETHTOOL_MSG_FEATURES_NTF``          netdev features notification
   ===================================== =================================
 
 ``GET`` requests are sent by userspace applications to retrieve device
@@ -591,6 +592,11 @@ reports the difference between old and new dev->features: mask consists of
 bits which have changed, values are their values in new dev->features (after
 the operation).
 
+``ETHTOOL_MSG_FEATURES_NTF`` notification is sent not only if device features
+are modified using ``ETHTOOL_MSG_FEATURES_SET`` request or on of ethtool ioctl
+request but also each time features are modified with netdev_update_features()
+or netdev_change_features().
+
 
 Request translation
 ===================

diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 6f7aaa6..3d0204c 100644 (file)
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -47,6 +47,7 @@ enum {
        ETHTOOL_MSG_WOL_NTF,
        ETHTOOL_MSG_FEATURES_GET_REPLY,
        ETHTOOL_MSG_FEATURES_SET_REPLY,
+       ETHTOOL_MSG_FEATURES_NTF,
 
        /* add new constants above here */
        __ETHTOOL_MSG_KERNEL_CNT,

diff --git a/net/ethtool/features.c b/net/ethtool/features.c
index 4ac1e05..4e632dc 100644 (file)
--- a/net/ethtool/features.c
+++ b/net/ethtool/features.c
@@ -230,6 +230,7 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
        struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
        struct ethnl_req_info req_info = {};
        struct net_device *dev;
+       bool mod;
        int ret;
 
        ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
@@ -272,6 +273,7 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
        dev->wanted_features = ethnl_bitmap_to_features(req_wanted);
        __netdev_update_features(dev);
        ethnl_features_to_bitmap(new_active, dev->features);
+       mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);
 
        ret = 0;
        if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
@@ -292,6 +294,8 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
                                          wanted_diff_mask, new_active,
                                          active_diff_mask, compact);
        }
+       if (mod)
+               ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
 
 out_rtnl:
        rtnl_unlock();

diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 757ea3f..5c0e361 100644 (file)
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -528,6 +528,7 @@ ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
        [ETHTOOL_MSG_LINKMODES_NTF]     = &ethnl_linkmodes_request_ops,
        [ETHTOOL_MSG_DEBUG_NTF]         = &ethnl_debug_request_ops,
        [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
+       [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
 };
 
 /* default notification handler */
@@ -613,6 +614,7 @@ static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
        [ETHTOOL_MSG_LINKMODES_NTF]     = ethnl_default_notify,
        [ETHTOOL_MSG_DEBUG_NTF]         = ethnl_default_notify,
        [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
+       [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
 };
 
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
@@ -630,6 +632,29 @@ void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
 }
 EXPORT_SYMBOL(ethtool_notify);
 
+static void ethnl_notify_features(struct netdev_notifier_info *info)
+{
+       struct net_device *dev = netdev_notifier_info_to_dev(info);
+
+       ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);
+}
+
+static int ethnl_netdev_event(struct notifier_block *this, unsigned long event,
+                             void *ptr)
+{
+       switch (event) {
+       case NETDEV_FEAT_CHANGE:
+               ethnl_notify_features(ptr);
+               break;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block ethnl_netdev_notifier = {
+       .notifier_call = ethnl_netdev_event,
+};
+
 /* genetlink setup */
 
 static const struct genl_ops ethtool_genl_ops[] = {
@@ -736,7 +761,9 @@ static int __init ethnl_init(void)
                return ret;
        ethnl_ok = true;
 
-       return 0;
+       ret = register_netdevice_notifier(&ethnl_netdev_notifier);
+       WARN(ret < 0, "ethtool: net device notifier registration failed");
+       return ret;
 }
 
 subsys_initcall(ethnl_init);