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Message-ID: <20250311084507.3978048-2-sdf@fomichev.me>
Date: Tue, 11 Mar 2025 01:45:06 -0700
From: Stanislav Fomichev <sdf@...ichev.me>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
linux-kernel@...r.kernel.org,
willemdebruijn.kernel@...il.com,
jasowang@...hat.com,
andrew+netdev@...n.ch,
horms@...nel.org,
sdf@...ichev.me,
jdamato@...tly.com,
kory.maincent@...tlin.com,
atenart@...nel.org,
kuniyu@...zon.com,
Kohei Enju <enjuk@...zon.com>
Subject: [PATCH net-next 1/2] Revert "net: replace dev_addr_sem with netdev instance lock"
This reverts commit df43d8bf10316a7c3b1e47e3cc0057a54df4a5b8.
Cc: Kohei Enju <enjuk@...zon.com>
Fixes: df43d8bf1031 ("net: replace dev_addr_sem with netdev instance lock")
Signed-off-by: Stanislav Fomichev <sdf@...ichev.me>
---
drivers/net/tap.c | 2 +-
drivers/net/tun.c | 2 +-
include/linux/netdevice.h | 6 ++++-
net/core/dev.c | 52 +++++++++++++++++++--------------------
net/core/dev.h | 3 ++-
net/core/dev_api.c | 17 +++++++++++--
net/core/dev_ioctl.c | 2 +-
net/core/net-sysfs.c | 7 ++++--
net/core/rtnetlink.c | 6 +----
9 files changed, 56 insertions(+), 41 deletions(-)
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 4382f5e323b0..d4ece538f1b2 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -1017,7 +1017,7 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
rtnl_unlock();
return -ENOLINK;
}
- ret = dev_set_mac_address(tap->dev, &sa, NULL);
+ ret = dev_set_mac_address_user(tap->dev, &sa, NULL);
tap_put_tap_dev(tap);
rtnl_unlock();
return ret;
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 55b60cb68d00..f75f912a0225 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -3193,7 +3193,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case SIOCSIFHWADDR:
/* Set hw address */
- ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr, NULL);
+ ret = dev_set_mac_address_user(tun->dev, &ifr.ifr_hwaddr, NULL);
break;
case TUNGETSNDBUF:
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9a297757df7e..42c75cb028e7 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2498,7 +2498,7 @@ struct net_device {
*
* Protects:
* @gro_flush_timeout, @napi_defer_hard_irqs, @napi_list,
- * @net_shaper_hierarchy, @reg_state, @threaded, @dev_addr
+ * @net_shaper_hierarchy, @reg_state, @threaded
*
* Partially protects (writers must hold both @lock and rtnl_lock):
* @up
@@ -4198,6 +4198,10 @@ int netif_set_mac_address(struct net_device *dev, struct sockaddr *sa,
struct netlink_ext_ack *extack);
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
struct netlink_ext_ack *extack);
+int netif_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
+ struct netlink_ext_ack *extack);
+int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
+ struct netlink_ext_ack *extack);
int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name);
int dev_get_port_parent_id(struct net_device *dev,
struct netdev_phys_item_id *ppid, bool recurse);
diff --git a/net/core/dev.c b/net/core/dev.c
index 1cb134ff7327..5a64389461e2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1059,28 +1059,6 @@ struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex)
return __netdev_put_lock(dev);
}
-/**
- * netdev_get_by_name_lock() - find a device by its name
- * @net: the applicable net namespace
- * @name: name of device
- *
- * Search for an interface by name. If a valid device
- * with @name is found it will be returned with netdev->lock held.
- * netdev_unlock() must be called to release it.
- *
- * Return: pointer to a device with lock held, NULL if not found.
- */
-struct net_device *netdev_get_by_name_lock(struct net *net, const char *name)
-{
- struct net_device *dev;
-
- dev = dev_get_by_name(net, name);
- if (!dev)
- return NULL;
-
- return __netdev_put_lock(dev);
-}
-
struct net_device *
netdev_xa_find_lock(struct net *net, struct net_device *dev,
unsigned long *index)
@@ -9612,24 +9590,44 @@ int netif_set_mac_address(struct net_device *dev, struct sockaddr *sa,
return 0;
}
+DECLARE_RWSEM(dev_addr_sem);
+
+int netif_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
+ struct netlink_ext_ack *extack)
+{
+ int ret;
+
+ down_write(&dev_addr_sem);
+ ret = netif_set_mac_address(dev, sa, extack);
+ up_write(&dev_addr_sem);
+ return ret;
+}
+
int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name)
{
size_t size = sizeof(sa->sa_data_min);
struct net_device *dev;
+ int ret = 0;
- dev = netdev_get_by_name_lock(net, dev_name);
- if (!dev)
- return -ENODEV;
+ down_read(&dev_addr_sem);
+ rcu_read_lock();
+ dev = dev_get_by_name_rcu(net, dev_name);
+ if (!dev) {
+ ret = -ENODEV;
+ goto unlock;
+ }
if (!dev->addr_len)
memset(sa->sa_data, 0, size);
else
memcpy(sa->sa_data, dev->dev_addr,
min_t(size_t, size, dev->addr_len));
sa->sa_family = dev->type;
- netdev_unlock(dev);
- return 0;
+unlock:
+ rcu_read_unlock();
+ up_read(&dev_addr_sem);
+ return ret;
}
EXPORT_SYMBOL(dev_get_mac_address);
diff --git a/net/core/dev.h b/net/core/dev.h
index 0ddd3631acb0..7ee203395d8e 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -29,7 +29,6 @@ netdev_napi_by_id_lock(struct net *net, unsigned int napi_id);
struct net_device *dev_get_by_napi_id(unsigned int napi_id);
struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex);
-struct net_device *netdev_get_by_name_lock(struct net *net, const char *name);
struct net_device *__netdev_put_lock(struct net_device *dev);
struct net_device *
netdev_xa_find_lock(struct net *net, struct net_device *dev,
@@ -71,6 +70,8 @@ extern int weight_p;
extern int dev_weight_rx_bias;
extern int dev_weight_tx_bias;
+extern struct rw_semaphore dev_addr_sem;
+
/* rtnl helpers */
extern struct list_head net_todo_list;
void netdev_run_todo(void);
diff --git a/net/core/dev_api.c b/net/core/dev_api.c
index 1f0e24849bc6..2e17548af685 100644
--- a/net/core/dev_api.c
+++ b/net/core/dev_api.c
@@ -84,6 +84,19 @@ void dev_set_group(struct net_device *dev, int new_group)
netdev_unlock_ops(dev);
}
+int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
+ struct netlink_ext_ack *extack)
+{
+ int ret;
+
+ netdev_lock_ops(dev);
+ ret = netif_set_mac_address_user(dev, sa, extack);
+ netdev_unlock_ops(dev);
+
+ return ret;
+}
+EXPORT_SYMBOL(dev_set_mac_address_user);
+
/**
* dev_change_net_namespace() - move device to different nethost namespace
* @dev: device
@@ -299,9 +312,9 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
{
int ret;
- netdev_lock(dev);
+ netdev_lock_ops(dev);
ret = netif_set_mac_address(dev, sa, extack);
- netdev_unlock(dev);
+ netdev_unlock_ops(dev);
return ret;
}
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 5471cf4fc984..eb8b41ec5523 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -575,7 +575,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
case SIOCSIFHWADDR:
if (dev->addr_len > sizeof(struct sockaddr))
return -EINVAL;
- return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL);
+ return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
case SIOCSIFHWBROADCAST:
if (ifr->ifr_hwaddr.sa_family != dev->type)
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 529a0f721268..abaa1c919b98 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -263,11 +263,14 @@ static ssize_t address_show(struct device *dev, struct device_attribute *attr,
struct net_device *ndev = to_net_dev(dev);
ssize_t ret = -EINVAL;
- netdev_lock(ndev);
+ down_read(&dev_addr_sem);
+
+ rcu_read_lock();
if (dev_isalive(ndev))
ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
- netdev_unlock(ndev);
+ rcu_read_unlock();
+ up_read(&dev_addr_sem);
return ret;
}
static DEVICE_ATTR_RO(address);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 90597bf84e3d..9355058bf996 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3090,11 +3090,7 @@ static int do_setlink(const struct sk_buff *skb, struct net_device *dev,
sa->sa_family = dev->type;
memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
dev->addr_len);
- if (!netdev_need_ops_lock(dev))
- netdev_lock(dev);
- err = netif_set_mac_address(dev, sa, extack);
- if (!netdev_need_ops_lock(dev))
- netdev_unlock(dev);
+ err = netif_set_mac_address_user(dev, sa, extack);
kfree(sa);
if (err)
goto errout;
--
2.48.1
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