ethtool: add LINKMODES_NTF notification

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> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Dec 28, 2019 · 1b1b184 · 1b1b184
1 parent bfbcfe2
commit 1b1b184
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Showing 5 changed files with 12 additions and 2 deletions.
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
@@ -193,6 +193,7 @@ 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
@@ -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
@@ -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
@@ -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
@@ -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)