1 files changed, 436 insertions, 218 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index fe10551d3671..c36a17aafcf3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -79,6 +79,7 @@
 #include <linux/cpu.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
+#include <linux/hash.h>
 #include <linux/sched.h>
 #include <linux/mutex.h>
 #include <linux/string.h>
@@ -104,6 +105,7 @@
 #include <net/dst.h>
 #include <net/pkt_sched.h>
 #include <net/checksum.h>
+#include <net/xfrm.h>
 #include <linux/highmem.h>
 #include <linux/init.h>
 #include <linux/kmod.h>
@@ -175,7 +177,7 @@ static struct list_head ptype_all __read_mostly;	/* Taps */
  * The @dev_base_head list is protected by @dev_base_lock and the rtnl
  * semaphore.
  *
- * Pure readers hold dev_base_lock for reading.
+ * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
  *
  * Writers must hold the rtnl semaphore while they loop through the
  * dev_base_head list, and hold dev_base_lock for writing when they do the
@@ -193,18 +195,15 @@ static struct list_head ptype_all __read_mostly;	/* Taps */
 DEFINE_RWLOCK(dev_base_lock);
 EXPORT_SYMBOL(dev_base_lock);
 
-#define NETDEV_HASHBITS 8
-#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
-
 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
 {
         unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
-        return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
+        return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
 }
 
 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
 {
-        return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
+        return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
 }
 
 /* Device list insertion */
@@ -215,23 +214,26 @@ static int list_netdevice(struct net_device *dev)
         ASSERT_RTNL();
 
         write_lock_bh(&dev_base_lock);
-        list_add_tail(&dev->dev_list, &net->dev_base_head);
-        hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
-        hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
+        list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
+        hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
+        hlist_add_head_rcu(&dev->index_hlist,
+                           dev_index_hash(net, dev->ifindex));
         write_unlock_bh(&dev_base_lock);
         return 0;
 }
 
-/* Device list removal */
+/* Device list removal
+ * caller must respect a RCU grace period before freeing/reusing dev
+ */
 static void unlist_netdevice(struct net_device *dev)
 {
         ASSERT_RTNL();
 
         /* Unlink dev from the device chain */
         write_lock_bh(&dev_base_lock);
-        list_del(&dev->dev_list);
-        hlist_del(&dev->name_hlist);
-        hlist_del(&dev->index_hlist);
+        list_del_rcu(&dev->dev_list);
+        hlist_del_rcu(&dev->name_hlist);
+        hlist_del_rcu(&dev->index_hlist);
         write_unlock_bh(&dev_base_lock);
 }
 
@@ -587,18 +589,44 @@ __setup("netdev=", netdev_boot_setup);
 struct net_device *__dev_get_by_name(struct net *net, const char *name)
 {
         struct hlist_node *p;
+        struct net_device *dev;
+        struct hlist_head *head = dev_name_hash(net, name);
 
-        hlist_for_each(p, dev_name_hash(net, name)) {
-                struct net_device *dev
-                        = hlist_entry(p, struct net_device, name_hlist);
+        hlist_for_each_entry(dev, p, head, name_hlist)
                 if (!strncmp(dev->name, name, IFNAMSIZ))
                         return dev;
-        }
+
         return NULL;
 }
 EXPORT_SYMBOL(__dev_get_by_name);
 
 /**
+ *      dev_get_by_name_rcu     - find a device by its name
+ *      @net: the applicable net namespace
+ *      @name: name to find
+ *
+ *      Find an interface by name.
+ *      If the name is found a pointer to the device is returned.
+ *      If the name is not found then %NULL is returned.
+ *      The reference counters are not incremented so the caller must be
+ *      careful with locks. The caller must hold RCU lock.
+ */
+
+struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
+{
+        struct hlist_node *p;
+        struct net_device *dev;
+        struct hlist_head *head = dev_name_hash(net, name);
+
+        hlist_for_each_entry_rcu(dev, p, head, name_hlist)
+                if (!strncmp(dev->name, name, IFNAMSIZ))
+                        return dev;
+
+        return NULL;
+}
+EXPORT_SYMBOL(dev_get_by_name_rcu);
+
+/**
  *      dev_get_by_name         - find a device by its name
  *      @net: the applicable net namespace
  *      @name: name to find
@@ -614,11 +642,11 @@ struct net_device *dev_get_by_name(struct net *net, const char *name)
 {
         struct net_device *dev;
 
-        read_lock(&dev_base_lock);
-        dev = __dev_get_by_name(net, name);
+        rcu_read_lock();
+        dev = dev_get_by_name_rcu(net, name);
         if (dev)
                 dev_hold(dev);
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
         return dev;
 }
 EXPORT_SYMBOL(dev_get_by_name);
@@ -638,17 +666,42 @@ EXPORT_SYMBOL(dev_get_by_name);
 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
 {
         struct hlist_node *p;
+        struct net_device *dev;
+        struct hlist_head *head = dev_index_hash(net, ifindex);
 
-        hlist_for_each(p, dev_index_hash(net, ifindex)) {
-                struct net_device *dev
-                        = hlist_entry(p, struct net_device, index_hlist);
+        hlist_for_each_entry(dev, p, head, index_hlist)
                 if (dev->ifindex == ifindex)
                         return dev;
-        }
+
         return NULL;
 }
 EXPORT_SYMBOL(__dev_get_by_index);
 
+/**
+ *      dev_get_by_index_rcu - find a device by its ifindex
+ *      @net: the applicable net namespace
+ *      @ifindex: index of device
+ *
+ *      Search for an interface by index. Returns %NULL if the device
+ *      is not found or a pointer to the device. The device has not
+ *      had its reference counter increased so the caller must be careful
+ *      about locking. The caller must hold RCU lock.
+ */
+
+struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
+{
+        struct hlist_node *p;
+        struct net_device *dev;
+        struct hlist_head *head = dev_index_hash(net, ifindex);
+
+        hlist_for_each_entry_rcu(dev, p, head, index_hlist)
+                if (dev->ifindex == ifindex)
+                        return dev;
+
+        return NULL;
+}
+EXPORT_SYMBOL(dev_get_by_index_rcu);
+
 
 /**
  *      dev_get_by_index - find a device by its ifindex
@@ -665,11 +718,11 @@ struct net_device *dev_get_by_index(struct net *net, int ifindex)
 {
         struct net_device *dev;
 
-        read_lock(&dev_base_lock);
-        dev = __dev_get_by_index(net, ifindex);
+        rcu_read_lock();
+        dev = dev_get_by_index_rcu(net, ifindex);
         if (dev)
                 dev_hold(dev);
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
         return dev;
 }
 EXPORT_SYMBOL(dev_get_by_index);
@@ -748,15 +801,15 @@ struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
         struct net_device *dev, *ret;
 
         ret = NULL;
-        read_lock(&dev_base_lock);
-        for_each_netdev(net, dev) {
+        rcu_read_lock();
+        for_each_netdev_rcu(net, dev) {
                 if (((dev->flags ^ if_flags) & mask) == 0) {
                         dev_hold(dev);
                         ret = dev;
                         break;
                 }
         }
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
         return ret;
 }
 EXPORT_SYMBOL(dev_get_by_flags);
@@ -841,7 +894,8 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
                 free_page((unsigned long) inuse);
         }
 
-        snprintf(buf, IFNAMSIZ, name, i);
+        if (buf != name)
+                snprintf(buf, IFNAMSIZ, name, i);
         if (!__dev_get_by_name(net, buf))
                 return i;
 
@@ -881,6 +935,21 @@ int dev_alloc_name(struct net_device *dev, const char *name)
 }
 EXPORT_SYMBOL(dev_alloc_name);
 
+static int dev_get_valid_name(struct net *net, const char *name, char *buf,
+                              bool fmt)
+{
+        if (!dev_valid_name(name))
+                return -EINVAL;
+
+        if (fmt && strchr(name, '%'))
+                return __dev_alloc_name(net, name, buf);
+        else if (__dev_get_by_name(net, name))
+                return -EEXIST;
+        else if (buf != name)
+                strlcpy(buf, name, IFNAMSIZ);
+
+        return 0;
+}
 
 /**
  *      dev_change_name - change name of a device
@@ -904,28 +973,20 @@ int dev_change_name(struct net_device *dev, const char *newname)
         if (dev->flags & IFF_UP)
                 return -EBUSY;
 
-        if (!dev_valid_name(newname))
-                return -EINVAL;
-
         if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
                 return 0;
 
         memcpy(oldname, dev->name, IFNAMSIZ);
 
-        if (strchr(newname, '%')) {
-                err = dev_alloc_name(dev, newname);
-                if (err < 0)
-                        return err;
-        } else if (__dev_get_by_name(net, newname))
-                return -EEXIST;
-        else
-                strlcpy(dev->name, newname, IFNAMSIZ);
+        err = dev_get_valid_name(net, newname, dev->name, 1);
+        if (err < 0)
+                return err;
 
 rollback:
         /* For now only devices in the initial network namespace
          * are in sysfs.
          */
-        if (net == &init_net) {
+        if (net_eq(net, &init_net)) {
                 ret = device_rename(&dev->dev, dev->name);
                 if (ret) {
                         memcpy(dev->name, oldname, IFNAMSIZ);
@@ -935,7 +996,12 @@ rollback:
 
         write_lock_bh(&dev_base_lock);
         hlist_del(&dev->name_hlist);
-        hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
+        write_unlock_bh(&dev_base_lock);
+
+        synchronize_rcu();
+
+        write_lock_bh(&dev_base_lock);
+        hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
         write_unlock_bh(&dev_base_lock);
 
         ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
@@ -1038,9 +1104,9 @@ void dev_load(struct net *net, const char *name)
 {
         struct net_device *dev;
 
-        read_lock(&dev_base_lock);
-        dev = __dev_get_by_name(net, name);
-        read_unlock(&dev_base_lock);
+        rcu_read_lock();
+        dev = dev_get_by_name_rcu(net, name);
+        rcu_read_unlock();
 
         if (!dev && capable(CAP_NET_ADMIN))
                 request_module("%s", name);
@@ -1287,6 +1353,7 @@ rollback:
                                 nb->notifier_call(nb, NETDEV_DOWN, dev);
                         }
                         nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
+                        nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
                 }
         }
 
@@ -1353,6 +1420,45 @@ static inline void net_timestamp(struct sk_buff *skb)
                 skb->tstamp.tv64 = 0;
 }
 
+/**
+ * dev_forward_skb - loopback an skb to another netif
+ *
+ * @dev: destination network device
+ * @skb: buffer to forward
+ *
+ * return values:
+ *      NET_RX_SUCCESS  (no congestion)
+ *      NET_RX_DROP     (packet was dropped)
+ *
+ * dev_forward_skb can be used for injecting an skb from the
+ * start_xmit function of one device into the receive queue
+ * of another device.
+ *
+ * The receiving device may be in another namespace, so
+ * we have to clear all information in the skb that could
+ * impact namespace isolation.
+ */
+int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
+{
+        skb_orphan(skb);
+
+        if (!(dev->flags & IFF_UP))
+                return NET_RX_DROP;
+
+        if (skb->len > (dev->mtu + dev->hard_header_len))
+                return NET_RX_DROP;
+
+        skb_dst_drop(skb);
+        skb->tstamp.tv64 = 0;
+        skb->pkt_type = PACKET_HOST;
+        skb->protocol = eth_type_trans(skb, dev);
+        skb->mark = 0;
+        secpath_reset(skb);
+        nf_reset(skb);
+        return netif_rx(skb);
+}
+EXPORT_SYMBOL_GPL(dev_forward_skb);
+
 /*
  *      Support routine. Sends outgoing frames to any network
  *      taps currently in use.
@@ -1701,7 +1807,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
                         struct netdev_queue *txq)
 {
         const struct net_device_ops *ops = dev->netdev_ops;
-        int rc;
+        int rc = NETDEV_TX_OK;
 
         if (likely(!skb->next)) {
                 if (!list_empty(&ptype_all))
@@ -1749,6 +1855,8 @@ gso:
                 nskb->next = NULL;
                 rc = ops->ndo_start_xmit(nskb, dev);
                 if (unlikely(rc != NETDEV_TX_OK)) {
+                        if (rc & ~NETDEV_TX_MASK)
+                                goto out_kfree_gso_skb;
                         nskb->next = skb->next;
                         skb->next = nskb;
                         return rc;
@@ -1758,11 +1866,12 @@ gso:
                         return NETDEV_TX_BUSY;
         } while (skb->next);
 
-        skb->destructor = DEV_GSO_CB(skb)->destructor;
-
+out_kfree_gso_skb:
+        if (likely(skb->next == NULL))
+                skb->destructor = DEV_GSO_CB(skb)->destructor;
 out_kfree_skb:
         kfree_skb(skb);
-        return NETDEV_TX_OK;
+        return rc;
 }
 
 static u32 skb_tx_hashrnd;
@@ -1789,16 +1898,43 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
 }
 EXPORT_SYMBOL(skb_tx_hash);
 
+static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
+{
+        if (unlikely(queue_index >= dev->real_num_tx_queues)) {
+                if (net_ratelimit()) {
+                        WARN(1, "%s selects TX queue %d, but "
+                             "real number of TX queues is %d\n",
+                             dev->name, queue_index,
+                             dev->real_num_tx_queues);
+                }
+                return 0;
+        }
+        return queue_index;
+}
+
 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
                                         struct sk_buff *skb)
 {
-        const struct net_device_ops *ops = dev->netdev_ops;
-        u16 queue_index = 0;
+        u16 queue_index;
+        struct sock *sk = skb->sk;
+
+        if (sk_tx_queue_recorded(sk)) {
+                queue_index = sk_tx_queue_get(sk);
+        } else {
+                const struct net_device_ops *ops = dev->netdev_ops;
 
-        if (ops->ndo_select_queue)
-                queue_index = ops->ndo_select_queue(dev, skb);
-        else if (dev->real_num_tx_queues > 1)
-                queue_index = skb_tx_hash(dev, skb);
+                if (ops->ndo_select_queue) {
+                        queue_index = ops->ndo_select_queue(dev, skb);
+                        queue_index = dev_cap_txqueue(dev, queue_index);
+                } else {
+                        queue_index = 0;
+                        if (dev->real_num_tx_queues > 1)
+                                queue_index = skb_tx_hash(dev, skb);
+
+                        if (sk && sk->sk_dst_cache)
+                                sk_tx_queue_set(sk, queue_index);
+                }
+        }
 
         skb_set_queue_mapping(skb, queue_index);
         return netdev_get_tx_queue(dev, queue_index);
@@ -1935,8 +2071,8 @@ gso:
                         HARD_TX_LOCK(dev, txq, cpu);
 
                         if (!netif_tx_queue_stopped(txq)) {
-                                rc = NET_XMIT_SUCCESS;
-                                if (!dev_hard_start_xmit(skb, dev, txq)) {
+                                rc = dev_hard_start_xmit(skb, dev, txq);
+                                if (dev_xmit_complete(rc)) {
                                         HARD_TX_UNLOCK(dev, txq);
                                         goto out;
                                 }
@@ -2191,7 +2327,7 @@ static int ing_filter(struct sk_buff *skb)
         if (MAX_RED_LOOP < ttl++) {
                 printk(KERN_WARNING
                        "Redir loop detected Dropping packet (%d->%d)\n",
-                       skb->iif, dev->ifindex);
+                       skb->skb_iif, dev->ifindex);
                 return TC_ACT_SHOT;
         }
 
@@ -2292,15 +2428,15 @@ int netif_receive_skb(struct sk_buff *skb)
         if (!skb->tstamp.tv64)
                 net_timestamp(skb);
 
-        if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
+        if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
                 return NET_RX_SUCCESS;
 
         /* if we've gotten here through NAPI, check netpoll */
         if (netpoll_receive_skb(skb))
                 return NET_RX_DROP;
 
-        if (!skb->iif)
-                skb->iif = skb->dev->ifindex;
+        if (!skb->skb_iif)
+                skb->skb_iif = skb->dev->ifindex;
 
         null_or_orig = NULL;
         orig_dev = skb->dev;
@@ -2440,7 +2576,7 @@ void napi_gro_flush(struct napi_struct *napi)
 }
 EXPORT_SYMBOL(napi_gro_flush);
 
-int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
         struct sk_buff **pp = NULL;
         struct packet_type *ptype;
@@ -2448,7 +2584,7 @@ int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
         struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
         int same_flow;
         int mac_len;
-        int ret;
+        enum gro_result ret;
 
         if (!(skb->dev->features & NETIF_F_GRO))
                 goto normal;
@@ -2532,7 +2668,8 @@ normal:
 }
 EXPORT_SYMBOL(dev_gro_receive);
 
-static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+static gro_result_t
+__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
         struct sk_buff *p;
 
@@ -2540,33 +2677,35 @@ static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
                 return GRO_NORMAL;
 
         for (p = napi->gro_list; p; p = p->next) {
-                NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev)
-                        && !compare_ether_header(skb_mac_header(p),
-                                                 skb_gro_mac_header(skb));
+                NAPI_GRO_CB(p)->same_flow =
+                        (p->dev == skb->dev) &&
+                        !compare_ether_header(skb_mac_header(p),
+                                              skb_gro_mac_header(skb));
                 NAPI_GRO_CB(p)->flush = 0;
         }
 
         return dev_gro_receive(napi, skb);
 }
 
-int napi_skb_finish(int ret, struct sk_buff *skb)
+gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
 {
-        int err = NET_RX_SUCCESS;
-
         switch (ret) {
         case GRO_NORMAL:
-                return netif_receive_skb(skb);
+                if (netif_receive_skb(skb))
+                        ret = GRO_DROP;
+                break;
 
         case GRO_DROP:
-                err = NET_RX_DROP;
-                /* fall through */
-
         case GRO_MERGED_FREE:
                 kfree_skb(skb);
                 break;
+
+        case GRO_HELD:
+        case GRO_MERGED:
+                break;
         }
 
-        return err;
+        return ret;
 }
 EXPORT_SYMBOL(napi_skb_finish);
 
@@ -2586,7 +2725,7 @@ void skb_gro_reset_offset(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(skb_gro_reset_offset);
 
-int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
         skb_gro_reset_offset(skb);
 
@@ -2605,49 +2744,41 @@ EXPORT_SYMBOL(napi_reuse_skb);
 
 struct sk_buff *napi_get_frags(struct napi_struct *napi)
 {
-        struct net_device *dev = napi->dev;
         struct sk_buff *skb = napi->skb;
 
         if (!skb) {
-                skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
-                if (!skb)
-                        goto out;
-
-                skb_reserve(skb, NET_IP_ALIGN);
-
-                napi->skb = skb;
+                skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
+                if (skb)
+                        napi->skb = skb;
         }
-
-out:
         return skb;
 }
 EXPORT_SYMBOL(napi_get_frags);
 
-int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
+gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
+                               gro_result_t ret)
 {
-        int err = NET_RX_SUCCESS;
-
         switch (ret) {
         case GRO_NORMAL:
         case GRO_HELD:
                 skb->protocol = eth_type_trans(skb, napi->dev);
 
-                if (ret == GRO_NORMAL)
-                        return netif_receive_skb(skb);
-
-                skb_gro_pull(skb, -ETH_HLEN);
+                if (ret == GRO_HELD)
+                        skb_gro_pull(skb, -ETH_HLEN);
+                else if (netif_receive_skb(skb))
+                        ret = GRO_DROP;
                 break;
 
         case GRO_DROP:
-                err = NET_RX_DROP;
-                /* fall through */
-
         case GRO_MERGED_FREE:
                 napi_reuse_skb(napi, skb);
                 break;
+
+        case GRO_MERGED:
+                break;
         }
 
-        return err;
+        return ret;
 }
 EXPORT_SYMBOL(napi_frags_finish);
 
@@ -2688,12 +2819,12 @@ out:
 }
 EXPORT_SYMBOL(napi_frags_skb);
 
-int napi_gro_frags(struct napi_struct *napi)
+gro_result_t napi_gro_frags(struct napi_struct *napi)
 {
         struct sk_buff *skb = napi_frags_skb(napi);
 
         if (!skb)
-                return NET_RX_DROP;
+                return GRO_DROP;
 
         return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
 }
@@ -2938,15 +3069,15 @@ static int dev_ifname(struct net *net, struct ifreq __user *arg)
         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
                 return -EFAULT;
 
-        read_lock(&dev_base_lock);
-        dev = __dev_get_by_index(net, ifr.ifr_ifindex);
+        rcu_read_lock();
+        dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
         if (!dev) {
-                read_unlock(&dev_base_lock);
+                rcu_read_unlock();
                 return -ENODEV;
         }
 
         strcpy(ifr.ifr_name, dev->name);
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
 
         if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
                 return -EFAULT;
@@ -3016,18 +3147,18 @@ static int dev_ifconf(struct net *net, char __user *arg)
  *      in detail.
  */
 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
-        __acquires(dev_base_lock)
+        __acquires(RCU)
 {
         struct net *net = seq_file_net(seq);
         loff_t off;
         struct net_device *dev;
 
-        read_lock(&dev_base_lock);
+        rcu_read_lock();
         if (!*pos)
                 return SEQ_START_TOKEN;
 
         off = 1;
-        for_each_netdev(net, dev)
+        for_each_netdev_rcu(net, dev)
                 if (off++ == *pos)
                         return dev;
 
@@ -3036,16 +3167,18 @@ void *dev_seq_start(struct seq_file *seq, loff_t *pos)
 
 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-        struct net *net = seq_file_net(seq);
+        struct net_device *dev = (v == SEQ_START_TOKEN) ?
+                                  first_net_device(seq_file_net(seq)) :
+                                  next_net_device((struct net_device *)v);
+
         ++*pos;
-        return v == SEQ_START_TOKEN ?
-                first_net_device(net) : next_net_device((struct net_device *)v);
+        return rcu_dereference(dev);
 }
 
 void dev_seq_stop(struct seq_file *seq, void *v)
-        __releases(dev_base_lock)
+        __releases(RCU)
 {
-        read_unlock(&dev_base_lock);
+        rcu_read_unlock();
 }
 
 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
@@ -4254,12 +4387,12 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
 EXPORT_SYMBOL(dev_set_mac_address);
 
 /*
- *      Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
+ *      Perform the SIOCxIFxxx calls, inside rcu_read_lock()
  */
 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
 {
         int err;
-        struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+        struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
 
         if (!dev)
                 return -ENODEV;
@@ -4491,9 +4624,9 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
         case SIOCGIFINDEX:
         case SIOCGIFTXQLEN:
                 dev_load(net, ifr.ifr_name);
-                read_lock(&dev_base_lock);
+                rcu_read_lock();
                 ret = dev_ifsioc_locked(net, &ifr, cmd);
-                read_unlock(&dev_base_lock);
+                rcu_read_unlock();
                 if (!ret) {
                         if (colon)
                                 *colon = ':';
@@ -4636,59 +4769,80 @@ static void net_set_todo(struct net_device *dev)
         list_add_tail(&dev->todo_list, &net_todo_list);
 }
 
-static void rollback_registered(struct net_device *dev)
+static void rollback_registered_many(struct list_head *head)
 {
+        struct net_device *dev;
+
         BUG_ON(dev_boot_phase);
         ASSERT_RTNL();
 
-        /* Some devices call without registering for initialization unwind. */
-        if (dev->reg_state == NETREG_UNINITIALIZED) {
-                printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
-                                  "was registered\n", dev->name, dev);
+        list_for_each_entry(dev, head, unreg_list) {
+                /* Some devices call without registering
+                 * for initialization unwind.
+                 */
+                if (dev->reg_state == NETREG_UNINITIALIZED) {
+                        pr_debug("unregister_netdevice: device %s/%p never "
+                                 "was registered\n", dev->name, dev);
 
-                WARN_ON(1);
-                return;
-        }
+                        WARN_ON(1);
+                        return;
+                }
 
-        BUG_ON(dev->reg_state != NETREG_REGISTERED);
+                BUG_ON(dev->reg_state != NETREG_REGISTERED);
 
-        /* If device is running, close it first. */
-        dev_close(dev);
+                /* If device is running, close it first. */
+                dev_close(dev);
 
-        /* And unlink it from device chain. */
-        unlist_netdevice(dev);
+                /* And unlink it from device chain. */
+                unlist_netdevice(dev);
 
-        dev->reg_state = NETREG_UNREGISTERING;
+                dev->reg_state = NETREG_UNREGISTERING;
+        }
 
         synchronize_net();
 
-        /* Shutdown queueing discipline. */
-        dev_shutdown(dev);
+        list_for_each_entry(dev, head, unreg_list) {
+                /* Shutdown queueing discipline. */
+                dev_shutdown(dev);
 
 
-        /* Notify protocols, that we are about to destroy
-           this device. They should clean all the things.
-        */
-        call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+                /* Notify protocols, that we are about to destroy
+                   this device. They should clean all the things.
+                */
+                call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
 
-        /*
-         *      Flush the unicast and multicast chains
-         */
-        dev_unicast_flush(dev);
-        dev_addr_discard(dev);
+                /*
+                 *      Flush the unicast and multicast chains
+                 */
+                dev_unicast_flush(dev);
+                dev_addr_discard(dev);
 
-        if (dev->netdev_ops->ndo_uninit)
-                dev->netdev_ops->ndo_uninit(dev);
+                if (dev->netdev_ops->ndo_uninit)
+                        dev->netdev_ops->ndo_uninit(dev);
 
-        /* Notifier chain MUST detach us from master device. */
-        WARN_ON(dev->master);
+                /* Notifier chain MUST detach us from master device. */
+                WARN_ON(dev->master);
 
-        /* Remove entries from kobject tree */
-        netdev_unregister_kobject(dev);
+                /* Remove entries from kobject tree */
+                netdev_unregister_kobject(dev);
+        }
+
+        /* Process any work delayed until the end of the batch */
+        dev = list_entry(head->next, struct net_device, unreg_list);
+        call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
 
         synchronize_net();
 
-        dev_put(dev);
+        list_for_each_entry(dev, head, unreg_list)
+                dev_put(dev);
+}
+
+static void rollback_registered(struct net_device *dev)
+{
+        LIST_HEAD(single);
+
+        list_add(&dev->unreg_list, &single);
+        rollback_registered_many(&single);
 }
 
 static void __netdev_init_queue_locks_one(struct net_device *dev,
@@ -4747,6 +4901,33 @@ unsigned long netdev_fix_features(unsigned long features, const char *name)
 EXPORT_SYMBOL(netdev_fix_features);
 
 /**
+ *      netif_stacked_transfer_operstate -      transfer operstate
+ *      @rootdev: the root or lower level device to transfer state from
+ *      @dev: the device to transfer operstate to
+ *
+ *      Transfer operational state from root to device. This is normally
+ *      called when a stacking relationship exists between the root
+ *      device and the device(a leaf device).
+ */
+void netif_stacked_transfer_operstate(const struct net_device *rootdev,
+                                        struct net_device *dev)
+{
+        if (rootdev->operstate == IF_OPER_DORMANT)
+                netif_dormant_on(dev);
+        else
+                netif_dormant_off(dev);
+
+        if (netif_carrier_ok(rootdev)) {
+                if (!netif_carrier_ok(dev))
+                        netif_carrier_on(dev);
+        } else {
+                if (netif_carrier_ok(dev))
+                        netif_carrier_off(dev);
+        }
+}
+EXPORT_SYMBOL(netif_stacked_transfer_operstate);
+
+/**
  *      register_netdevice      - register a network device
  *      @dev: device to register
  *
@@ -4765,8 +4946,6 @@ EXPORT_SYMBOL(netdev_fix_features);
 
 int register_netdevice(struct net_device *dev)
 {
-        struct hlist_head *head;
-        struct hlist_node *p;
         int ret;
         struct net *net = dev_net(dev);
 
@@ -4795,26 +4974,14 @@ int register_netdevice(struct net_device *dev)
                 }
         }
 
-        if (!dev_valid_name(dev->name)) {
-                ret = -EINVAL;
+        ret = dev_get_valid_name(net, dev->name, dev->name, 0);
+        if (ret)
                 goto err_uninit;
-        }
 
         dev->ifindex = dev_new_index(net);
         if (dev->iflink == -1)
                 dev->iflink = dev->ifindex;
 
-        /* Check for existence of name */
-        head = dev_name_hash(net, dev->name);
-        hlist_for_each(p, head) {
-                struct net_device *d
-                        = hlist_entry(p, struct net_device, name_hlist);
-                if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
-                        ret = -EEXIST;
-                        goto err_uninit;
-                }
-        }
-
         /* Fix illegal checksum combinations */
         if ((dev->features & NETIF_F_HW_CSUM) &&
             (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
@@ -4837,6 +5004,12 @@ int register_netdevice(struct net_device *dev)
                 dev->features |= NETIF_F_GSO;
 
         netdev_initialize_kobject(dev);
+
+        ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
+        ret = notifier_to_errno(ret);
+        if (ret)
+                goto err_uninit;
+
         ret = netdev_register_kobject(dev);
         if (ret)
                 goto err_uninit;
@@ -4961,6 +5134,8 @@ static void netdev_wait_allrefs(struct net_device *dev)
 {
         unsigned long rebroadcast_time, warning_time;
 
+        linkwatch_forget_dev(dev);
+
         rebroadcast_time = warning_time = jiffies;
         while (atomic_read(&dev->refcnt) != 0) {
                 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
@@ -4968,6 +5143,8 @@ 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 */
 
                         if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
                                      &dev->state)) {
@@ -5063,6 +5240,32 @@ void netdev_run_todo(void)
 }
 
 /**
+ *      dev_txq_stats_fold - fold tx_queues stats
+ *      @dev: device to get statistics from
+ *      @stats: struct net_device_stats to hold results
+ */
+void dev_txq_stats_fold(const struct net_device *dev,
+                        struct net_device_stats *stats)
+{
+        unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
+        unsigned int i;
+        struct netdev_queue *txq;
+
+        for (i = 0; i < dev->num_tx_queues; i++) {
+                txq = netdev_get_tx_queue(dev, i);
+                tx_bytes   += txq->tx_bytes;
+                tx_packets += txq->tx_packets;
+                tx_dropped += txq->tx_dropped;
+        }
+        if (tx_bytes || tx_packets || tx_dropped) {
+                stats->tx_bytes   = tx_bytes;
+                stats->tx_packets = tx_packets;
+                stats->tx_dropped = tx_dropped;
+        }
+}
+EXPORT_SYMBOL(dev_txq_stats_fold);
+
+/**
  *      dev_get_stats   - get network device statistics
  *      @dev: device to get statistics from
  *
@@ -5076,25 +5279,9 @@ const struct net_device_stats *dev_get_stats(struct net_device *dev)
 
         if (ops->ndo_get_stats)
                 return ops->ndo_get_stats(dev);
-        else {
-                unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
-                struct net_device_stats *stats = &dev->stats;
-                unsigned int i;
-                struct netdev_queue *txq;
-
-                for (i = 0; i < dev->num_tx_queues; i++) {
-                        txq = netdev_get_tx_queue(dev, i);
-                        tx_bytes   += txq->tx_bytes;
-                        tx_packets += txq->tx_packets;
-                        tx_dropped += txq->tx_dropped;
-                }
-                if (tx_bytes || tx_packets || tx_dropped) {
-                        stats->tx_bytes   = tx_bytes;
-                        stats->tx_packets = tx_packets;
-                        stats->tx_dropped = tx_dropped;
-                }
-                return stats;
-        }
+
+        dev_txq_stats_fold(dev, &dev->stats);
+        return &dev->stats;
 }
 EXPORT_SYMBOL(dev_get_stats);
 
@@ -5174,6 +5361,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
         netdev_init_queues(dev);
 
         INIT_LIST_HEAD(&dev->napi_list);
+        INIT_LIST_HEAD(&dev->unreg_list);
+        INIT_LIST_HEAD(&dev->link_watch_list);
         dev->priv_flags = IFF_XMIT_DST_RELEASE;
         setup(dev);
         strcpy(dev->name, name);
@@ -5238,25 +5427,47 @@ void synchronize_net(void)
 EXPORT_SYMBOL(synchronize_net);
 
 /**
- *      unregister_netdevice - remove device from the kernel
+ *      unregister_netdevice_queue - remove device from the kernel
  *      @dev: device
+ *      @head: list
  *
  *      This function shuts down a device interface and removes it
  *      from the kernel tables.
+ *      If head not NULL, device is queued to be unregistered later.
  *
  *      Callers must hold the rtnl semaphore.  You may want
  *      unregister_netdev() instead of this.
  */
 
-void unregister_netdevice(struct net_device *dev)
+void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
 {
         ASSERT_RTNL();
 
-        rollback_registered(dev);
-        /* Finish processing unregister after unlock */
-        net_set_todo(dev);
+        if (head) {
+                list_move_tail(&dev->unreg_list, head);
+        } else {
+                rollback_registered(dev);
+                /* Finish processing unregister after unlock */
+                net_set_todo(dev);
+        }
 }
-EXPORT_SYMBOL(unregister_netdevice);
+EXPORT_SYMBOL(unregister_netdevice_queue);
+
+/**
+ *      unregister_netdevice_many - unregister many devices
+ *      @head: list of devices
+ */
+void unregister_netdevice_many(struct list_head *head)
+{
+        struct net_device *dev;
+
+        if (!list_empty(head)) {
+                rollback_registered_many(head);
+                list_for_each_entry(dev, head, unreg_list)
+                        net_set_todo(dev);
+        }
+}
+EXPORT_SYMBOL(unregister_netdevice_many);
 
 /**
  *      unregister_netdev - remove device from the kernel
@@ -5293,8 +5504,6 @@ EXPORT_SYMBOL(unregister_netdev);
 
 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
 {
-        char buf[IFNAMSIZ];
-        const char *destname;
         int err;
 
         ASSERT_RTNL();
@@ -5327,20 +5536,11 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
          * we can use it in the destination network namespace.
          */
         err = -EEXIST;
-        destname = dev->name;
-        if (__dev_get_by_name(net, destname)) {
+        if (__dev_get_by_name(net, dev->name)) {
                 /* We get here if we can't use the current device name */
                 if (!pat)
                         goto out;
-                if (!dev_valid_name(pat))
-                        goto out;
-                if (strchr(pat, '%')) {
-                        if (__dev_alloc_name(net, pat, buf) < 0)
-                                goto out;
-                        destname = buf;
-                } else
-                        destname = pat;
-                if (__dev_get_by_name(net, destname))
+                if (dev_get_valid_name(net, pat, dev->name, 1))
                         goto out;
         }
 
@@ -5364,6 +5564,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
            this device. They should clean all the things.
         */
         call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+        call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
 
         /*
          *      Flush the unicast and multicast chains
@@ -5376,10 +5577,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
         /* Actually switch the network namespace */
         dev_net_set(dev, net);
 
-        /* Assign the new device name */
-        if (destname != dev->name)
-                strcpy(dev->name, destname);
-
         /* If there is an ifindex conflict assign a new one */
         if (__dev_get_by_index(net, dev->ifindex)) {
                 int iflink = (dev->iflink == dev->ifindex);
@@ -5484,7 +5681,7 @@ unsigned long netdev_increment_features(unsigned long all, unsigned long one,
         one |= NETIF_F_ALL_CSUM;
 
         one |= all & NETIF_F_ONE_FOR_ALL;
-        all &= one | NETIF_F_LLTX | NETIF_F_GSO;
+        all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
         all |= one & mask & NETIF_F_ONE_FOR_ALL;
 
         return all;
@@ -5566,14 +5763,13 @@ static struct pernet_operations __net_initdata netdev_net_ops = {
 
 static void __net_exit default_device_exit(struct net *net)
 {
-        struct net_device *dev;
+        struct net_device *dev, *aux;
         /*
-         * Push all migratable of the network devices back to the
+         * Push all migratable network devices back to the
          * initial network namespace
          */
         rtnl_lock();
-restart:
-        for_each_netdev(net, dev) {
+        for_each_netdev_safe(net, dev, aux) {
                 int err;
                 char fb_name[IFNAMSIZ];
 
@@ -5581,11 +5777,9 @@ restart:
                 if (dev->features & NETIF_F_NETNS_LOCAL)
                         continue;
 
-                /* Delete virtual devices */
-                if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
-                        dev->rtnl_link_ops->dellink(dev);
-                        goto restart;
-                }
+                /* Leave virtual devices for the generic cleanup */
+                if (dev->rtnl_link_ops)
+                        continue;
 
                 /* Push remaing network devices to init_net */
                 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
@@ -5595,13 +5789,37 @@ restart:
                                 __func__, dev->name, err);
                         BUG();
                 }
-                goto restart;
         }
         rtnl_unlock();
 }
 
+static void __net_exit default_device_exit_batch(struct list_head *net_list)
+{
+        /* At exit all network devices most be removed from a network
+         * namespace.  Do this in the reverse order of registeration.
+         * Do this across as many network namespaces as possible to
+         * improve batching efficiency.
+         */
+        struct net_device *dev;
+        struct net *net;
+        LIST_HEAD(dev_kill_list);
+
+        rtnl_lock();
+        list_for_each_entry(net, net_list, exit_list) {
+                for_each_netdev_reverse(net, dev) {
+                        if (dev->rtnl_link_ops)
+                                dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
+                        else
+                                unregister_netdevice_queue(dev, &dev_kill_list);
+                }
+        }
+        unregister_netdevice_many(&dev_kill_list);
+        rtnl_unlock();
+}
+
 static struct pernet_operations __net_initdata default_device_ops = {
         .exit = default_device_exit,
+        .exit_batch = default_device_exit_batch,
 };
 
 /*