ethtool: add RINGS_NTF notification

Send ETHTOOL_MSG_RINGS_NTF notification whenever ring sizes of a network
device are modified using ETHTOOL_MSG_RINGS_SET netlink message or
ETHTOOL_SRINGPARAM ioctl request.

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 ba31ae8..026a5fd 100644 (file)
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -216,6 +216,7 @@ Kernel to userspace:
   ``ETHTOOL_MSG_PRIVFLAGS_GET_REPLY``   private flags
   ``ETHTOOL_MSG_PRIVFLAGS_NTF``         private flags
   ``ETHTOOL_MSG_RINGS_GET_REPLY``       ring sizes
+  ``ETHTOOL_MSG_RINGS_NTF``             ring sizes
   ===================================== =================================
 
 ``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 ae71801..abfc8fd 100644 (file)
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -55,6 +55,7 @@ enum {
        ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
        ETHTOOL_MSG_PRIVFLAGS_NTF,
        ETHTOOL_MSG_RINGS_GET_REPLY,
+       ETHTOOL_MSG_RINGS_NTF,
 
        /* add new constants above here */
        __ETHTOOL_MSG_KERNEL_CNT,

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 2988222..1d5c1b6 100644 (file)
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1635,6 +1635,7 @@ static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
 static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
 {
        struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
+       int ret;
 
        if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
                return -EOPNOTSUPP;
@@ -1651,7 +1652,10 @@ static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
            ringparam.tx_pending > max.tx_max_pending)
                return -EINVAL;
 
-       return dev->ethtool_ops->set_ringparam(dev, &ringparam);
+       ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
+       if (!ret)
+               ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
+       return ret;
 }
 
 static noinline_for_stack int ethtool_get_channels(struct net_device *dev,

diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 6a1ac88..653e009 100644 (file)
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -532,6 +532,7 @@ ethnl_default_notify_ops[ETHTOOL_MSG_KERNEL_MAX + 1] = {
        [ETHTOOL_MSG_WOL_NTF]           = &ethnl_wol_request_ops,
        [ETHTOOL_MSG_FEATURES_NTF]      = &ethnl_features_request_ops,
        [ETHTOOL_MSG_PRIVFLAGS_NTF]     = &ethnl_privflags_request_ops,
+       [ETHTOOL_MSG_RINGS_NTF]         = &ethnl_rings_request_ops,
 };
 
 /* default notification handler */
@@ -619,6 +620,7 @@ static const ethnl_notify_handler_t ethnl_notify_handlers[] = {
        [ETHTOOL_MSG_WOL_NTF]           = ethnl_default_notify,
        [ETHTOOL_MSG_FEATURES_NTF]      = ethnl_default_notify,
        [ETHTOOL_MSG_PRIVFLAGS_NTF]     = ethnl_default_notify,
+       [ETHTOOL_MSG_RINGS_NTF]         = ethnl_default_notify,
 };
 
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data)

diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index 93f428e..c2ebf72 100644 (file)
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -186,6 +186,9 @@ int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
        }
 
        ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
+       if (ret < 0)
+               goto out_ops;
+       ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
 
 out_ops:
        ethnl_ops_complete(dev);