[PATCH net-next v8 13/14] ethtool: add LINKMODES_NTF notification

[Michal Kubecek <mkubecek@suse.cz>]

Send ETHTOOL_MSG_LINKMODES_NTF notification message whenever device link
settings or advertised modes are modified using ETHTOOL_MSG_LINKMODES_SET
netlink message or ETHTOOL_SLINKSETTINGS or ETHTOOL_SSET ioctl commands.

The notification message has the same format as reply to LINKMODES_GET
request. ETHTOOL_MSG_LINKMODES_SET netlink request only triggers the
notification if there is a change but the ioctl command handlers do not
check if there is an actual change and trigger the notification whenever
the commands are executed.

As all work is done by ethnl_default_notify() handler and callback
functions introduced to handle LINKMODES_GET requests, all that remains is
adding entries for ETHTOOL_MSG_LINKMODES_NTF into ethnl_notify_handlers and
ethnl_default_notify_ops lookup tables and calls to ethtool_notify() where
needed.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
 Documentation/networking/ethtool-netlink.rst | 1 +
 include/uapi/linux/ethtool_netlink.h         | 1 +
 net/ethtool/ioctl.c                          | 8 ++++++--
 net/ethtool/linkmodes.c                      | 2 ++
 net/ethtool/netlink.c                        | 2 ++
 5 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 9cdf1e2d6a92..03aee9f3c0c5 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -183,6 +183,7 @@ Kernel to userspace:
   ``ETHTOOL_MSG_LINKINFO_GET_REPLY``    link settings
   ``ETHTOOL_MSG_LINKINFO_NTF``          link settings notification
   ``ETHTOOL_MSG_LINKMODES_GET_REPLY``   link modes info
+  ``ETHTOOL_MSG_LINKMODES_NTF``         link modes notification
   ===================================== ================================
 
 ``GET`` requests are sent by userspace applications to retrieve device
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index cddf978b98df..35948df6d6e3 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -32,6 +32,7 @@ enum {
 	ETHTOOL_MSG_LINKINFO_GET_REPLY,
 	ETHTOOL_MSG_LINKINFO_NTF,
 	ETHTOOL_MSG_LINKMODES_GET_REPLY,
+	ETHTOOL_MSG_LINKMODES_NTF,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_KERNEL_CNT,
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index bada0f9a97ec..65aaa7db17d5 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -573,8 +573,10 @@ static int ethtool_set_link_ksettings(struct net_device *dev,
 		return -EINVAL;
 
 	err = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
-	if (err >= 0)
+	if (err >= 0) {
 		ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);
+		ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
+	}
 	return err;
 }
 
@@ -638,8 +640,10 @@ static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 	link_ksettings.base.link_mode_masks_nwords =
 		__ETHTOOL_LINK_MODE_MASK_NU32;
 	ret = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
-	if (ret >= 0)
+	if (ret >= 0) {
 		ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);
+		ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
+	}
 	return ret;
 }
 
diff --git a/net/ethtool/linkmodes.c b/net/ethtool/linkmodes.c
index 790b60771d0e..0b99f494ad3b 100644
--- a/net/ethtool/linkmodes.c
+++ b/net/ethtool/linkmodes.c
@@ -364,6 +364,8 @@ int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
 		ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
 		if (ret < 0)
 			GENL_SET_ERR_MSG(info, "link settings update failed");
+		else
+			ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
 	}
 
 out_ops:
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 5f28f3cb022d..1b5e1bd26504 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -511,6 +511,7 @@ static int ethnl_default_done(struct netlink_callback *cb)
 static const struct ethnl_request_ops *
 ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
 	[ETHTOOL_MSG_LINKINFO_NTF]	= &ethnl_linkinfo_request_ops,
+	[ETHTOOL_MSG_LINKMODES_NTF]	= &ethnl_linkmodes_request_ops,
 };
 
 /* default notification handler */
@@ -592,6 +593,7 @@ typedef void (*ethnl_notify_handler_t)(struct net_device *dev, unsigned int cmd,
 
 static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
 	[ETHTOOL_MSG_LINKINFO_NTF]	= ethnl_default_notify,
+	[ETHTOOL_MSG_LINKMODES_NTF]	= ethnl_default_notify,
 };
 
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)
-- 
2.24.1