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Date: Thu, 5 Jan 2017 23:21:18 -0500
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [PATCH net] net: Fix inconsistent rtnl_lock usage on dev_get_stats().
Some callers take rtnl_lock() before calling dev_get_stats() and some
don't. Most network drivers expect the ndo_get_stats64() to be called
under rtnl_lock() to avoid race conditions with device close or ethtool
reconfigurations. Fix it so that all callers take rtnl_lock().
Rename the original dev_get_stats() as __dev_get_stats() and add a new
dev_get_stats() that takes rtnl_lock() before calling __dev_get_stats().
Modify all callers that already take rtnl_lock() to call __dev_get_stats().
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/bonding/bond_main.c | 4 ++--
drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 2 +-
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 2 +-
drivers/net/ethernet/intel/ixgbevf/ethtool.c | 2 +-
drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c | 2 +-
include/linux/netdevice.h | 2 ++
net/core/dev.c | 19 ++++++++++++++++---
net/core/rtnetlink.c | 4 ++--
8 files changed, 26 insertions(+), 11 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 8029dd4..9a2fbea 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1509,7 +1509,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
slave_dev->priv_flags |= IFF_BONDING;
/* initialize slave stats */
- dev_get_stats(new_slave->dev, &new_slave->slave_stats);
+ __dev_get_stats(new_slave->dev, &new_slave->slave_stats);
if (bond_is_lb(bond)) {
/* bond_alb_init_slave() must be called before all other stages since
@@ -3351,7 +3351,7 @@ static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
rcu_read_lock();
bond_for_each_slave_rcu(bond, slave, iter) {
const struct rtnl_link_stats64 *new =
- dev_get_stats(slave->dev, &temp);
+ __dev_get_stats(slave->dev, &temp);
bond_fold_stats(stats, new, &slave->slave_stats);
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index 3ac2183..8396336 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -865,7 +865,7 @@ void hns_get_ethtool_stats(struct net_device *netdev,
h->dev->ops->update_stats(h, &netdev->stats);
- net_stats = dev_get_stats(netdev, &temp);
+ net_stats = __dev_get_stats(netdev, &temp);
/* get netdev statistics */
p[0] = net_stats->rx_packets;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index fd192bf..f8097c4 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -1145,7 +1145,7 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev,
char *p = NULL;
ixgbe_update_stats(adapter);
- net_stats = dev_get_stats(netdev, &temp);
+ net_stats = __dev_get_stats(netdev, &temp);
for (i = 0; i < IXGBE_GLOBAL_STATS_LEN; i++) {
switch (ixgbe_gstrings_stats[i].type) {
case NETDEV_STATS:
diff --git a/drivers/net/ethernet/intel/ixgbevf/ethtool.c b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
index 508e72c..622ccad 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
@@ -406,7 +406,7 @@ static void ixgbevf_get_ethtool_stats(struct net_device *netdev,
char *p;
ixgbevf_update_stats(adapter);
- net_stats = dev_get_stats(netdev, &temp);
+ net_stats = __dev_get_stats(netdev, &temp);
for (i = 0; i < IXGBEVF_GLOBAL_STATS_LEN; i++) {
switch (ixgbevf_gstrings_stats[i].type) {
case NETDEV_STATS:
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 1b26e96..ea77de0 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -270,7 +270,7 @@ static void nfp_net_get_stats(struct net_device *netdev,
int i, j, k;
u8 *p;
- netdev_stats = dev_get_stats(netdev, &temp);
+ netdev_stats = __dev_get_stats(netdev, &temp);
for (i = 0; i < NN_ET_GLOBAL_STATS_LEN; i++) {
switch (nfp_net_et_stats[i].type) {
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 994f742..76bc92f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3787,6 +3787,8 @@ static inline void __dev_mc_unsync(struct net_device *dev,
void netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
void dev_load(struct net *net, const char *name);
+struct rtnl_link_stats64 *__dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage);
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *storage);
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
diff --git a/net/core/dev.c b/net/core/dev.c
index 8db5a0b..ecd1eee 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7578,7 +7578,7 @@ void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
EXPORT_SYMBOL(netdev_stats_to_stats64);
/**
- * dev_get_stats - get network device statistics
+ * __dev_get_stats - get network device statistics
* @dev: device to get statistics from
* @storage: place to store stats
*
@@ -7587,11 +7587,12 @@ void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
* dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
* otherwise the internal statistics structure is used.
*/
-struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
- struct rtnl_link_stats64 *storage)
+struct rtnl_link_stats64 *__dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage)
{
const struct net_device_ops *ops = dev->netdev_ops;
+ ASSERT_RTNL();
if (ops->ndo_get_stats64) {
memset(storage, 0, sizeof(*storage));
ops->ndo_get_stats64(dev, storage);
@@ -7605,6 +7606,18 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
storage->rx_nohandler += atomic_long_read(&dev->rx_nohandler);
return storage;
}
+EXPORT_SYMBOL(__dev_get_stats);
+
+struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage)
+{
+ struct rtnl_link_stats64 *stats;
+
+ rtnl_lock();
+ stats = __dev_get_stats(dev, storage);
+ rtnl_unlock();
+ return stats;
+}
EXPORT_SYMBOL(dev_get_stats);
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 75e3ea7..37c9ccd 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1100,7 +1100,7 @@ static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
return -EMSGSIZE;
sp = nla_data(attr);
- dev_get_stats(dev, sp);
+ __dev_get_stats(dev, sp);
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
@@ -3767,7 +3767,7 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
goto nla_put_failure;
sp = nla_data(attr);
- dev_get_stats(dev, sp);
+ __dev_get_stats(dev, sp);
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
--
1.8.3.1
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