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Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c109
1 files changed, 74 insertions, 35 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 17e912f9b711..1e0a1847c3bb 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -959,18 +959,30 @@ int dev_alloc_name(struct net_device *dev, const char *name)
}
EXPORT_SYMBOL(dev_alloc_name);
-static int dev_get_valid_name(struct net_device *dev, const char *name)
+static int dev_alloc_name_ns(struct net *net,
+ struct net_device *dev,
+ const char *name)
{
- struct net *net;
+ char buf[IFNAMSIZ];
+ int ret;
- BUG_ON(!dev_net(dev));
- net = dev_net(dev);
+ ret = __dev_alloc_name(net, name, buf);
+ if (ret >= 0)
+ strlcpy(dev->name, buf, IFNAMSIZ);
+ return ret;
+}
+
+static int dev_get_valid_name(struct net *net,
+ struct net_device *dev,
+ const char *name)
+{
+ BUG_ON(!net);
if (!dev_valid_name(name))
return -EINVAL;
if (strchr(name, '%'))
- return dev_alloc_name(dev, name);
+ return dev_alloc_name_ns(net, dev, name);
else if (__dev_get_by_name(net, name))
return -EEXIST;
else if (dev->name != name)
@@ -1006,7 +1018,7 @@ int dev_change_name(struct net_device *dev, const char *newname)
memcpy(oldname, dev->name, IFNAMSIZ);
- err = dev_get_valid_name(dev, newname);
+ err = dev_get_valid_name(net, dev, newname);
if (err < 0)
return err;
@@ -1109,11 +1121,23 @@ void netdev_state_change(struct net_device *dev)
}
EXPORT_SYMBOL(netdev_state_change);
-int netdev_bonding_change(struct net_device *dev, unsigned long event)
+/**
+ * netdev_notify_peers - notify network peers about existence of @dev
+ * @dev: network device
+ *
+ * Generate traffic such that interested network peers are aware of
+ * @dev, such as by generating a gratuitous ARP. This may be used when
+ * a device wants to inform the rest of the network about some sort of
+ * reconfiguration such as a failover event or virtual machine
+ * migration.
+ */
+void netdev_notify_peers(struct net_device *dev)
{
- return call_netdevice_notifiers(event, dev);
+ rtnl_lock();
+ call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
+ rtnl_unlock();
}
-EXPORT_SYMBOL(netdev_bonding_change);
+EXPORT_SYMBOL(netdev_notify_peers);
/**
* dev_load - load a network module
@@ -1394,7 +1418,6 @@ rollback:
nb->notifier_call(nb, NETDEV_DOWN, dev);
}
nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
- nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
}
}
@@ -1436,7 +1459,6 @@ int unregister_netdevice_notifier(struct notifier_block *nb)
nb->notifier_call(nb, NETDEV_DOWN, dev);
}
nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
- nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
}
}
unlock:
@@ -2175,9 +2197,7 @@ EXPORT_SYMBOL(netif_skb_features);
/*
* Returns true if either:
* 1. skb has frag_list and the device doesn't support FRAGLIST, or
- * 2. skb is fragmented and the device does not support SG, or if
- * at least one of fragments is in highmem and device does not
- * support DMA from it.
+ * 2. skb is fragmented and the device does not support SG.
*/
static inline int skb_needs_linearize(struct sk_buff *skb,
int features)
@@ -2206,9 +2226,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
skb_dst_drop(skb);
- if (!list_empty(&ptype_all))
- dev_queue_xmit_nit(skb, dev);
-
features = netif_skb_features(skb);
if (vlan_tx_tag_present(skb) &&
@@ -2243,6 +2260,9 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
}
}
+ if (!list_empty(&ptype_all))
+ dev_queue_xmit_nit(skb, dev);
+
skb_len = skb->len;
rc = ops->ndo_start_xmit(skb, dev);
trace_net_dev_xmit(skb, rc, dev, skb_len);
@@ -2265,6 +2285,9 @@ gso:
if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
skb_dst_drop(nskb);
+ if (!list_empty(&ptype_all))
+ dev_queue_xmit_nit(nskb, dev);
+
skb_len = nskb->len;
rc = ops->ndo_start_xmit(nskb, dev);
trace_net_dev_xmit(nskb, rc, dev, skb_len);
@@ -2374,8 +2397,8 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
#endif
}
-static struct netdev_queue *dev_pick_tx(struct net_device *dev,
- struct sk_buff *skb)
+struct netdev_queue *netdev_pick_tx(struct net_device *dev,
+ struct sk_buff *skb)
{
int queue_index;
const struct net_device_ops *ops = dev->netdev_ops;
@@ -2549,7 +2572,7 @@ int dev_queue_xmit(struct sk_buff *skb)
skb_update_prio(skb);
- txq = dev_pick_tx(dev, skb);
+ txq = netdev_pick_tx(dev, skb);
q = rcu_dereference_bh(txq->qdisc);
#ifdef CONFIG_NET_CLS_ACT
@@ -2622,6 +2645,8 @@ EXPORT_SYMBOL(dev_queue_xmit);
=======================================================================*/
int netdev_max_backlog __read_mostly = 1000;
+EXPORT_SYMBOL(netdev_max_backlog);
+
int netdev_tstamp_prequeue __read_mostly = 1;
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64; /* old backlog weight */
@@ -5239,12 +5264,12 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
*/
static int dev_new_index(struct net *net)
{
- static int ifindex;
+ int ifindex = net->ifindex;
for (;;) {
if (++ifindex <= 0)
ifindex = 1;
if (!__dev_get_by_index(net, ifindex))
- return ifindex;
+ return net->ifindex = ifindex;
}
}
@@ -5322,10 +5347,6 @@ static void rollback_registered_many(struct list_head *head)
netdev_unregister_kobject(dev);
}
- /* Process any work delayed until the end of the batch */
- dev = list_first_entry(head, struct net_device, unreg_list);
- call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
-
synchronize_net();
list_for_each_entry(dev, head, unreg_list)
@@ -5583,7 +5604,7 @@ int register_netdevice(struct net_device *dev)
dev->iflink = -1;
- ret = dev_get_valid_name(dev, dev->name);
+ ret = dev_get_valid_name(net, dev, dev->name);
if (ret < 0)
goto out;
@@ -5597,7 +5618,12 @@ int register_netdevice(struct net_device *dev)
}
}
- dev->ifindex = dev_new_index(net);
+ ret = -EBUSY;
+ if (!dev->ifindex)
+ dev->ifindex = dev_new_index(net);
+ else if (__dev_get_by_index(net, dev->ifindex))
+ goto err_uninit;
+
if (dev->iflink == -1)
dev->iflink = dev->ifindex;
@@ -5640,6 +5666,8 @@ int register_netdevice(struct net_device *dev)
set_bit(__LINK_STATE_PRESENT, &dev->state);
+ linkwatch_init_dev(dev);
+
dev_init_scheduler(dev);
dev_hold(dev);
list_netdevice(dev);
@@ -5773,9 +5801,12 @@ static void netdev_wait_allrefs(struct net_device *dev)
/* Rebroadcast unregister notification */
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
- /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
- * should have already handle it the first time */
+ __rtnl_unlock();
+ rcu_barrier();
+ rtnl_lock();
+
+ call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
&dev->state)) {
/* We must not have linkwatch events
@@ -5837,9 +5868,8 @@ void netdev_run_todo(void)
__rtnl_unlock();
- /* Wait for rcu callbacks to finish before attempting to drain
- * the device list. This usually avoids a 250ms wait.
- */
+
+ /* Wait for rcu callbacks to finish before next phase */
if (!list_empty(&list))
rcu_barrier();
@@ -5848,6 +5878,10 @@ void netdev_run_todo(void)
= list_first_entry(&list, struct net_device, todo_list);
list_del(&dev->todo_list);
+ rtnl_lock();
+ call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
+ __rtnl_unlock();
+
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
pr_err("network todo '%s' but state %d\n",
dev->name, dev->reg_state);
@@ -5943,6 +5977,8 @@ struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
return queue;
}
+static const struct ethtool_ops default_ethtool_ops;
+
/**
* alloc_netdev_mqs - allocate network device
* @sizeof_priv: size of private data to allocate space for
@@ -6030,6 +6066,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
strcpy(dev->name, name);
dev->group = INIT_NETDEV_GROUP;
+ if (!dev->ethtool_ops)
+ dev->ethtool_ops = &default_ethtool_ops;
return dev;
free_all:
@@ -6214,7 +6252,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
/* We get here if we can't use the current device name */
if (!pat)
goto out;
- if (dev_get_valid_name(dev, pat) < 0)
+ if (dev_get_valid_name(net, dev, pat) < 0)
goto out;
}
@@ -6242,7 +6280,8 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
the device is just moving and can keep their slaves up.
*/
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
- call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
+ rcu_barrier();
+ call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
/*