From: Jakub Kicinski <kuba@kernel•org>
To: davem@davemloft•net
Cc: netdev@vger•kernel.org, edumazet@google•com, pabeni@redhat•com,
andrew+netdev@lunn•ch, horms@kernel•org,
michael.chan@broadcom•com, hkallweit1@gmail•com,
maxime.chevallier@bootlin•com, joshwash@google•com,
tariqt@nvidia•com, alexanderduyck@fb•com, willemb@google•com,
jacob.e.keller@intel•com, kory.maincent@bootlin•com,
sdf.kernel@gmail•com, jakub@cloudflare•com, nb@tipi-net•de,
Jakub Kicinski <kuba@kernel•org>
Subject: [PATCH net-next v2 10/12] net: ethtool: ioctl: concentrate the locking
Date: Thu, 4 Jun 2026 17:29:10 -0700 [thread overview]
Message-ID: <20260605002912.3456868-11-kuba@kernel.org> (raw)
In-Reply-To: <20260605002912.3456868-1-kuba@kernel.org>
Add another layer of helper functions to make upcoming locking
changes easier. Otherwise we'd need a pretty complex goto
structure. netdev instance lock is now taken slightly sooner
but that should not be an issue since rtnl_lock is already held,
anyway.
Signed-off-by: Jakub Kicinski <kuba@kernel•org>
---
net/ethtool/ioctl.c | 35 +++++++++++++++++++++++++----------
1 file changed, 25 insertions(+), 10 deletions(-)
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index a4b0cbae4063..c32c099845e3 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -3258,18 +3258,14 @@ static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
/* The main entry point in this file. Called from net/core/dev_ioctl.c */
static int
-__dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr,
- u32 ethcmd, struct ethtool_devlink_compat *devlink_state)
+dev_ethtool_locked(struct net *net, struct net_device *dev,
+ void __user *useraddr,
+ u32 ethcmd, struct ethtool_devlink_compat *devlink_state)
{
- struct net_device *dev;
u32 sub_cmd;
int rc;
netdev_features_t old_features;
- dev = __dev_get_by_name(net, ifr->ifr_name);
- if (!dev)
- return -ENODEV;
-
if (ethcmd == ETHTOOL_PERQUEUE) {
if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
return -EFAULT;
@@ -3320,7 +3316,6 @@ __dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr,
return -EPERM;
}
- netdev_lock_ops(dev);
if (dev->dev.parent)
pm_runtime_get_sync(dev->dev.parent);
@@ -3560,7 +3555,29 @@ __dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr,
out:
if (dev->dev.parent)
pm_runtime_put(dev->dev.parent);
+
+ return rc;
+}
+
+static int
+__dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr,
+ u32 ethcmd, struct ethtool_devlink_compat *devlink_state)
+{
+ struct net_device *dev;
+ int rc;
+
+ rtnl_lock();
+ dev = __dev_get_by_name(net, ifr->ifr_name);
+ if (!dev) {
+ rc = -ENODEV;
+ goto exit_rtnl_unlock;
+ }
+
+ netdev_lock_ops(dev);
+ rc = dev_ethtool_locked(net, dev, useraddr, ethcmd, devlink_state);
netdev_unlock_ops(dev);
+exit_rtnl_unlock:
+ rtnl_unlock();
return rc;
}
@@ -3588,9 +3605,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *useraddr)
break;
}
- rtnl_lock();
rc = __dev_ethtool(net, ifr, useraddr, ethcmd, state);
- rtnl_unlock();
if (rc)
goto exit_free;
--
2.54.0
next prev parent reply other threads:[~2026-06-05 0:29 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-05 0:29 [PATCH net-next v2 00/12] net: ethtool: let ops locked drivers run without rtnl_lock Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 01/12] net: ethtool: serialize broadcast notification sequence allocation Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 02/12] net: ethtool: relax ethnl_req_get_phydev() locking assertion Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 03/12] net: ethtool: make dev->hwprov ops-protected Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 04/12] net: ethtool: optionally skip rtnl_lock on Netlink path for GET ops Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 05/12] net: ethtool: optionally skip rtnl_lock on Netlink path for SET ops Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 06/12] net: ethtool: optionally skip rtnl_lock in cable test handlers Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 07/12] net: ethtool: optionally skip rtnl_lock in ethnl_tsinfo_dumpit() Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 08/12] net: ethtool: optionally skip rtnl_lock in ethnl_act_module_fw_flash() Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 09/12] net: ethtool: optionally skip rtnl_lock in RSS context handlers Jakub Kicinski
2026-06-05 0:29 ` Jakub Kicinski [this message]
2026-06-05 0:29 ` [PATCH net-next v2 11/12] net: ethtool: optionally skip rtnl_lock on IOCTL path Jakub Kicinski
2026-06-05 0:29 ` [PATCH net-next v2 12/12] docs: net: ethtool: document ops-locked drivers and op_needs_rtnl Jakub Kicinski
2026-06-05 22:48 ` [PATCH net-next v2 00/12] net: ethtool: let ops locked drivers run without rtnl_lock Stanislav Fomichev
2026-06-06 0:09 ` Jakub Kicinski
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