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Subject[PATCH net-next 12/15] ethtool: add RINGS_NTF notification
Date
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>
---
Documentation/networking/ethtool-netlink.rst | 1 +
include/uapi/linux/ethtool_netlink.h | 1 +
net/ethtool/ioctl.c | 6 +++++-
net/ethtool/netlink.c | 2 ++
net/ethtool/rings.c | 3 +++
5 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index ba31ae8f1feb..026a5fd4a08b 100644
--- 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 ae71801b7aac..abfc8fd626da 100644
--- 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 298822289496..1d5c1b6b81a4 100644
--- 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 6a1ac8897a7e..653e009216cd 100644
--- 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 56e628456619..0e29443e13d6 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -176,6 +176,9 @@ 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);
--
2.25.1
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