Merge branch 'tip/perf/jump-label-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into perf/urgent

1 files changed, 369 insertions, 244 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 7ec85e27bee..35dfb831848 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -131,6 +131,7 @@
 #include <trace/events/net.h>
 #include <trace/events/skb.h>
 #include <linux/pci.h>
+#include <linux/inetdevice.h>
 
 #include "net-sysfs.h"
 
@@ -373,6 +374,14 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
  *                                                      --ANK (980803)
  */
 
+static inline struct list_head *ptype_head(const struct packet_type *pt)
+{
+        if (pt->type == htons(ETH_P_ALL))
+                return &ptype_all;
+        else
+                return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
+}
+
 /**
  *      dev_add_pack - add packet handler
  *      @pt: packet type declaration
@@ -388,16 +397,11 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
 
 void dev_add_pack(struct packet_type *pt)
 {
-        int hash;
+        struct list_head *head = ptype_head(pt);
 
-        spin_lock_bh(&ptype_lock);
-        if (pt->type == htons(ETH_P_ALL))
-                list_add_rcu(&pt->list, &ptype_all);
-        else {
-                hash = ntohs(pt->type) & PTYPE_HASH_MASK;
-                list_add_rcu(&pt->list, &ptype_base[hash]);
-        }
-        spin_unlock_bh(&ptype_lock);
+        spin_lock(&ptype_lock);
+        list_add_rcu(&pt->list, head);
+        spin_unlock(&ptype_lock);
 }
 EXPORT_SYMBOL(dev_add_pack);
 
@@ -416,15 +420,10 @@ EXPORT_SYMBOL(dev_add_pack);
  */
 void __dev_remove_pack(struct packet_type *pt)
 {
-        struct list_head *head;
+        struct list_head *head = ptype_head(pt);
         struct packet_type *pt1;
 
-        spin_lock_bh(&ptype_lock);
-
-        if (pt->type == htons(ETH_P_ALL))
-                head = &ptype_all;
-        else
-                head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
+        spin_lock(&ptype_lock);
 
         list_for_each_entry(pt1, head, list) {
                 if (pt == pt1) {
@@ -435,7 +434,7 @@ void __dev_remove_pack(struct packet_type *pt)
 
         printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
 out:
-        spin_unlock_bh(&ptype_lock);
+        spin_unlock(&ptype_lock);
 }
 EXPORT_SYMBOL(__dev_remove_pack);
 
@@ -1486,8 +1485,9 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
         skb_orphan(skb);
         nf_reset(skb);
 
-        if (!(dev->flags & IFF_UP) ||
-            (skb->len > (dev->mtu + dev->hard_header_len))) {
+        if (unlikely(!(dev->flags & IFF_UP) ||
+                     (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) {
+                atomic_long_inc(&dev->rx_dropped);
                 kfree_skb(skb);
                 return NET_RX_DROP;
         }
@@ -1555,21 +1555,56 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
  * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
  * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
  */
-void netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
+int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
 {
-        unsigned int real_num = dev->real_num_tx_queues;
+        if (txq < 1 || txq > dev->num_tx_queues)
+                return -EINVAL;
 
-        if (unlikely(txq > dev->num_tx_queues))
-                ;
-        else if (txq > real_num)
-                dev->real_num_tx_queues = txq;
-        else if (txq < real_num) {
-                dev->real_num_tx_queues = txq;
-                qdisc_reset_all_tx_gt(dev, txq);
+        if (dev->reg_state == NETREG_REGISTERED) {
+                ASSERT_RTNL();
+
+                if (txq < dev->real_num_tx_queues)
+                        qdisc_reset_all_tx_gt(dev, txq);
         }
+
+        dev->real_num_tx_queues = txq;
+        return 0;
 }
 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
 
+#ifdef CONFIG_RPS
+/**
+ *      netif_set_real_num_rx_queues - set actual number of RX queues used
+ *      @dev: Network device
+ *      @rxq: Actual number of RX queues
+ *
+ *      This must be called either with the rtnl_lock held or before
+ *      registration of the net device.  Returns 0 on success, or a
+ *      negative error code.  If called before registration, it always
+ *      succeeds.
+ */
+int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
+{
+        int rc;
+
+        if (rxq < 1 || rxq > dev->num_rx_queues)
+                return -EINVAL;
+
+        if (dev->reg_state == NETREG_REGISTERED) {
+                ASSERT_RTNL();
+
+                rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
+                                                  rxq);
+                if (rc)
+                        return rc;
+        }
+
+        dev->real_num_rx_queues = rxq;
+        return 0;
+}
+EXPORT_SYMBOL(netif_set_real_num_rx_queues);
+#endif
+
 static inline void __netif_reschedule(struct Qdisc *q)
 {
         struct softnet_data *sd;
@@ -1650,10 +1685,10 @@ EXPORT_SYMBOL(netif_device_attach);
 
 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
 {
-        return ((features & NETIF_F_GEN_CSUM) ||
-                ((features & NETIF_F_IP_CSUM) &&
+        return ((features & NETIF_F_NO_CSUM) ||
+                ((features & NETIF_F_V4_CSUM) &&
                  protocol == htons(ETH_P_IP)) ||
-                ((features & NETIF_F_IPV6_CSUM) &&
+                ((features & NETIF_F_V6_CSUM) &&
                  protocol == htons(ETH_P_IPV6)) ||
                 ((features & NETIF_F_FCOE_CRC) &&
                  protocol == htons(ETH_P_FCOE)));
@@ -1661,17 +1696,18 @@ static bool can_checksum_protocol(unsigned long features, __be16 protocol)
 
 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
 {
-        if (can_checksum_protocol(dev->features, skb->protocol))
-                return true;
+        __be16 protocol = skb->protocol;
+        int features = dev->features;
 
-        if (skb->protocol == htons(ETH_P_8021Q)) {
+        if (vlan_tx_tag_present(skb)) {
+                features &= dev->vlan_features;
+        } else if (protocol == htons(ETH_P_8021Q)) {
                 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
-                if (can_checksum_protocol(dev->features & dev->vlan_features,
-                                          veh->h_vlan_encapsulated_proto))
-                        return true;
+                protocol = veh->h_vlan_encapsulated_proto;
+                features &= dev->vlan_features;
         }
 
-        return false;
+        return can_checksum_protocol(features, protocol);
 }
 
 /**
@@ -1760,6 +1796,16 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
         __be16 type = skb->protocol;
         int err;
 
+        if (type == htons(ETH_P_8021Q)) {
+                struct vlan_ethhdr *veh;
+
+                if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
+                        return ERR_PTR(-EINVAL);
+
+                veh = (struct vlan_ethhdr *)skb->data;
+                type = veh->h_vlan_encapsulated_proto;
+        }
+
         skb_reset_mac_header(skb);
         skb->mac_len = skb->network_header - skb->mac_header;
         __skb_pull(skb, skb->mac_len);
@@ -1904,14 +1950,14 @@ static int dev_gso_segment(struct sk_buff *skb)
 
 /*
  * Try to orphan skb early, right before transmission by the device.
- * We cannot orphan skb if tx timestamp is requested, since
- * drivers need to call skb_tstamp_tx() to send the timestamp.
+ * We cannot orphan skb if tx timestamp is requested or the sk-reference
+ * is needed on driver level for other reasons, e.g. see net/can/raw.c
  */
 static inline void skb_orphan_try(struct sk_buff *skb)
 {
         struct sock *sk = skb->sk;
 
-        if (sk && !skb_tx(skb)->flags) {
+        if (sk && !skb_shinfo(skb)->tx_flags) {
                 /* skb_tx_hash() wont be able to get sk.
                  * We copy sk_hash into skb->rxhash
                  */
@@ -1931,9 +1977,14 @@ static inline void skb_orphan_try(struct sk_buff *skb)
 static inline int skb_needs_linearize(struct sk_buff *skb,
                                       struct net_device *dev)
 {
+        int features = dev->features;
+
+        if (skb->protocol == htons(ETH_P_8021Q) || vlan_tx_tag_present(skb))
+                features &= dev->vlan_features;
+
         return skb_is_nonlinear(skb) &&
-               ((skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
-                (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
+               ((skb_has_frag_list(skb) && !(features & NETIF_F_FRAGLIST)) ||
+                (skb_shinfo(skb)->nr_frags && (!(features & NETIF_F_SG) ||
                                               illegal_highdma(dev, skb))));
 }
 
@@ -1956,6 +2007,15 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 
                 skb_orphan_try(skb);
 
+                if (vlan_tx_tag_present(skb) &&
+                    !(dev->features & NETIF_F_HW_VLAN_TX)) {
+                        skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
+                        if (unlikely(!skb))
+                                goto out;
+
+                        skb->vlan_tci = 0;
+                }
+
                 if (netif_needs_gso(dev, skb)) {
                         if (unlikely(dev_gso_segment(skb)))
                                 goto out_kfree_skb;
@@ -2019,6 +2079,7 @@ out_kfree_gso_skb:
                 skb->destructor = DEV_GSO_CB(skb)->destructor;
 out_kfree_skb:
         kfree_skb(skb);
+out:
         return rc;
 }
 
@@ -2147,6 +2208,9 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
         return rc;
 }
 
+static DEFINE_PER_CPU(int, xmit_recursion);
+#define RECURSION_LIMIT 10
+
 /**
  *      dev_queue_xmit - transmit a buffer
  *      @skb: buffer to transmit
@@ -2213,10 +2277,15 @@ int dev_queue_xmit(struct sk_buff *skb)
 
                 if (txq->xmit_lock_owner != cpu) {
 
+                        if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
+                                goto recursion_alert;
+
                         HARD_TX_LOCK(dev, txq, cpu);
 
                         if (!netif_tx_queue_stopped(txq)) {
+                                __this_cpu_inc(xmit_recursion);
                                 rc = dev_hard_start_xmit(skb, dev, txq);
+                                __this_cpu_dec(xmit_recursion);
                                 if (dev_xmit_complete(rc)) {
                                         HARD_TX_UNLOCK(dev, txq);
                                         goto out;
@@ -2228,7 +2297,9 @@ int dev_queue_xmit(struct sk_buff *skb)
                                        "queue packet!\n", dev->name);
                 } else {
                         /* Recursion is detected! It is possible,
-                         * unfortunately */
+                         * unfortunately
+                         */
+recursion_alert:
                         if (net_ratelimit())
                                 printk(KERN_CRIT "Dead loop on virtual device "
                                        "%s, fix it urgently!\n", dev->name);
@@ -2264,69 +2335,44 @@ static inline void ____napi_schedule(struct softnet_data *sd,
         __raise_softirq_irqoff(NET_RX_SOFTIRQ);
 }
 
-#ifdef CONFIG_RPS
-
-/* One global table that all flow-based protocols share. */
-struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
-EXPORT_SYMBOL(rps_sock_flow_table);
-
 /*
- * get_rps_cpu is called from netif_receive_skb and returns the target
- * CPU from the RPS map of the receiving queue for a given skb.
- * rcu_read_lock must be held on entry.
+ * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
+ * and src/dst port numbers. Returns a non-zero hash number on success
+ * and 0 on failure.
  */
-static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
-                       struct rps_dev_flow **rflowp)
+__u32 __skb_get_rxhash(struct sk_buff *skb)
 {
+        int nhoff, hash = 0, poff;
         struct ipv6hdr *ip6;
         struct iphdr *ip;
-        struct netdev_rx_queue *rxqueue;
-        struct rps_map *map;
-        struct rps_dev_flow_table *flow_table;
-        struct rps_sock_flow_table *sock_flow_table;
-        int cpu = -1;
         u8 ip_proto;
-        u16 tcpu;
         u32 addr1, addr2, ihl;
         union {
                 u32 v32;
                 u16 v16[2];
         } ports;
 
-        if (skb_rx_queue_recorded(skb)) {
-                u16 index = skb_get_rx_queue(skb);
-                if (unlikely(index >= dev->num_rx_queues)) {
-                        WARN_ONCE(dev->num_rx_queues > 1, "%s received packet "
-                                "on queue %u, but number of RX queues is %u\n",
-                                dev->name, index, dev->num_rx_queues);
-                        goto done;
-                }
-                rxqueue = dev->_rx + index;
-        } else
-                rxqueue = dev->_rx;
-
-        if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
-                goto done;
-
-        if (skb->rxhash)
-                goto got_hash; /* Skip hash computation on packet header */
+        nhoff = skb_network_offset(skb);
 
         switch (skb->protocol) {
         case __constant_htons(ETH_P_IP):
-                if (!pskb_may_pull(skb, sizeof(*ip)))
+                if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
                         goto done;
 
-                ip = (struct iphdr *) skb->data;
-                ip_proto = ip->protocol;
+                ip = (struct iphdr *) (skb->data + nhoff);
+                if (ip->frag_off & htons(IP_MF | IP_OFFSET))
+                        ip_proto = 0;
+                else
+                        ip_proto = ip->protocol;
                 addr1 = (__force u32) ip->saddr;
                 addr2 = (__force u32) ip->daddr;
                 ihl = ip->ihl;
                 break;
         case __constant_htons(ETH_P_IPV6):
-                if (!pskb_may_pull(skb, sizeof(*ip6)))
+                if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
                         goto done;
 
-                ip6 = (struct ipv6hdr *) skb->data;
+                ip6 = (struct ipv6hdr *) (skb->data + nhoff);
                 ip_proto = ip6->nexthdr;
                 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
                 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
@@ -2335,33 +2381,81 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
         default:
                 goto done;
         }
-        switch (ip_proto) {
-        case IPPROTO_TCP:
-        case IPPROTO_UDP:
-        case IPPROTO_DCCP:
-        case IPPROTO_ESP:
-        case IPPROTO_AH:
-        case IPPROTO_SCTP:
-        case IPPROTO_UDPLITE:
-                if (pskb_may_pull(skb, (ihl * 4) + 4)) {
-                        ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
+
+        ports.v32 = 0;
+        poff = proto_ports_offset(ip_proto);
+        if (poff >= 0) {
+                nhoff += ihl * 4 + poff;
+                if (pskb_may_pull(skb, nhoff + 4)) {
+                        ports.v32 = * (__force u32 *) (skb->data + nhoff);
                         if (ports.v16[1] < ports.v16[0])
                                 swap(ports.v16[0], ports.v16[1]);
-                        break;
                 }
-        default:
-                ports.v32 = 0;
-                break;
         }
 
         /* get a consistent hash (same value on both flow directions) */
         if (addr2 < addr1)
                 swap(addr1, addr2);
-        skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
-        if (!skb->rxhash)
-                skb->rxhash = 1;
 
-got_hash:
+        hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
+        if (!hash)
+                hash = 1;
+
+done:
+        return hash;
+}
+EXPORT_SYMBOL(__skb_get_rxhash);
+
+#ifdef CONFIG_RPS
+
+/* One global table that all flow-based protocols share. */
+struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
+EXPORT_SYMBOL(rps_sock_flow_table);
+
+/*
+ * get_rps_cpu is called from netif_receive_skb and returns the target
+ * CPU from the RPS map of the receiving queue for a given skb.
+ * rcu_read_lock must be held on entry.
+ */
+static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
+                       struct rps_dev_flow **rflowp)
+{
+        struct netdev_rx_queue *rxqueue;
+        struct rps_map *map;
+        struct rps_dev_flow_table *flow_table;
+        struct rps_sock_flow_table *sock_flow_table;
+        int cpu = -1;
+        u16 tcpu;
+
+        if (skb_rx_queue_recorded(skb)) {
+                u16 index = skb_get_rx_queue(skb);
+                if (unlikely(index >= dev->real_num_rx_queues)) {
+                        WARN_ONCE(dev->real_num_rx_queues > 1,
+                                  "%s received packet on queue %u, but number "
+                                  "of RX queues is %u\n",
+                                  dev->name, index, dev->real_num_rx_queues);
+                        goto done;
+                }
+                rxqueue = dev->_rx + index;
+        } else
+                rxqueue = dev->_rx;
+
+        map = rcu_dereference(rxqueue->rps_map);
+        if (map) {
+                if (map->len == 1) {
+                        tcpu = map->cpus[0];
+                        if (cpu_online(tcpu))
+                                cpu = tcpu;
+                        goto done;
+                }
+        } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
+                goto done;
+        }
+
+        skb_reset_network_header(skb);
+        if (!skb_get_rxhash(skb))
+                goto done;
+
         flow_table = rcu_dereference(rxqueue->rps_flow_table);
         sock_flow_table = rcu_dereference(rps_sock_flow_table);
         if (flow_table && sock_flow_table) {
@@ -2401,7 +2495,6 @@ got_hash:
                 }
         }
 
-        map = rcu_dereference(rxqueue->rps_map);
         if (map) {
                 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
 
@@ -2487,6 +2580,7 @@ enqueue:
 
         local_irq_restore(flags);
 
+        atomic_long_inc(&skb->dev->rx_dropped);
         kfree_skb(skb);
         return NET_RX_DROP;
 }
@@ -2643,11 +2737,10 @@ EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
  * the ingress scheduler, you just cant add policies on ingress.
  *
  */
-static int ing_filter(struct sk_buff *skb)
+static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
 {
         struct net_device *dev = skb->dev;
         u32 ttl = G_TC_RTTL(skb->tc_verd);
-        struct netdev_queue *rxq;
         int result = TC_ACT_OK;
         struct Qdisc *q;
 
@@ -2661,8 +2754,6 @@ static int ing_filter(struct sk_buff *skb)
         skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
         skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
 
-        rxq = &dev->rx_queue;
-
         q = rxq->qdisc;
         if (q != &noop_qdisc) {
                 spin_lock(qdisc_lock(q));
@@ -2678,7 +2769,9 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
                                          struct packet_type **pt_prev,
                                          int *ret, struct net_device *orig_dev)
 {
-        if (skb->dev->rx_queue.qdisc == &noop_qdisc)
+        struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
+
+        if (!rxq || rxq->qdisc == &noop_qdisc)
                 goto out;
 
         if (*pt_prev) {
@@ -2686,7 +2779,7 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
                 *pt_prev = NULL;
         }
 
-        switch (ing_filter(skb)) {
+        switch (ing_filter(skb, rxq)) {
         case TC_ACT_SHOT:
         case TC_ACT_STOLEN:
                 kfree_skb(skb);
@@ -2699,33 +2792,6 @@ out:
 }
 #endif
 
-/*
- *      netif_nit_deliver - deliver received packets to network taps
- *      @skb: buffer
- *
- *      This function is used to deliver incoming packets to network
- *      taps. It should be used when the normal netif_receive_skb path
- *      is bypassed, for example because of VLAN acceleration.
- */
-void netif_nit_deliver(struct sk_buff *skb)
-{
-        struct packet_type *ptype;
-
-        if (list_empty(&ptype_all))
-                return;
-
-        skb_reset_network_header(skb);
-        skb_reset_transport_header(skb);
-        skb->mac_len = skb->network_header - skb->mac_header;
-
-        rcu_read_lock();
-        list_for_each_entry_rcu(ptype, &ptype_all, list) {
-                if (!ptype->dev || ptype->dev == skb->dev)
-                        deliver_skb(skb, ptype, skb->dev);
-        }
-        rcu_read_unlock();
-}
-
 /**
  *      netdev_rx_handler_register - register receive handler
  *      @dev: device to register a handler for
@@ -2836,8 +2902,6 @@ static int __netif_receive_skb(struct sk_buff *skb)
                 net_timestamp_check(skb);
 
         trace_netif_receive_skb(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))
@@ -2851,8 +2915,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
          * be delivered to pkt handlers that are exact matches.  Also
          * the deliver_no_wcard flag will be set.  If packet handlers
          * are sensitive to duplicate packets these skbs will need to
-         * be dropped at the handler.  The vlan accel path may have
-         * already set the deliver_no_wcard flag.
+         * be dropped at the handler.
          */
         null_or_orig = NULL;
         orig_dev = skb->dev;
@@ -2911,6 +2974,18 @@ ncls:
                         goto out;
         }
 
+        if (vlan_tx_tag_present(skb)) {
+                if (pt_prev) {
+                        ret = deliver_skb(skb, pt_prev, orig_dev);
+                        pt_prev = NULL;
+                }
+                if (vlan_hwaccel_do_receive(&skb)) {
+                        ret = __netif_receive_skb(skb);
+                        goto out;
+                } else if (unlikely(!skb))
+                        goto out;
+        }
+
         /*
          * Make sure frames received on VLAN interfaces stacked on
          * bonding interfaces still make their way to any base bonding
@@ -2938,6 +3013,7 @@ ncls:
         if (pt_prev) {
                 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
         } else {
+                atomic_long_inc(&skb->dev->rx_dropped);
                 kfree_skb(skb);
                 /* Jamal, now you will not able to escape explaining
                  * me how you were going to use this. :-)
@@ -3058,7 +3134,7 @@ out:
         return netif_receive_skb(skb);
 }
 
-static void napi_gro_flush(struct napi_struct *napi)
+inline void napi_gro_flush(struct napi_struct *napi)
 {
         struct sk_buff *skb, *next;
 
@@ -3071,6 +3147,7 @@ static void napi_gro_flush(struct napi_struct *napi)
         napi->gro_count = 0;
         napi->gro_list = NULL;
 }
+EXPORT_SYMBOL(napi_gro_flush);
 
 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
@@ -3085,7 +3162,7 @@ enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
         if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
                 goto normal;
 
-        if (skb_is_gso(skb) || skb_has_frags(skb))
+        if (skb_is_gso(skb) || skb_has_frag_list(skb))
                 goto normal;
 
         rcu_read_lock();
@@ -3164,16 +3241,19 @@ normal:
 }
 EXPORT_SYMBOL(dev_gro_receive);
 
-static gro_result_t
+static inline gro_result_t
 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
         struct sk_buff *p;
 
         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),
+                unsigned long diffs;
+
+                diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
+                diffs |= p->vlan_tci ^ skb->vlan_tci;
+                diffs |= compare_ether_header(skb_mac_header(p),
                                               skb_gro_mac_header(skb));
+                NAPI_GRO_CB(p)->same_flow = !diffs;
                 NAPI_GRO_CB(p)->flush = 0;
         }
 
@@ -3226,14 +3306,14 @@ gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(napi_gro_receive);
 
-void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
+static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
 {
         __skb_pull(skb, skb_headlen(skb));
         skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
+        skb->vlan_tci = 0;
 
         napi->skb = skb;
 }
-EXPORT_SYMBOL(napi_reuse_skb);
 
 struct sk_buff *napi_get_frags(struct napi_struct *napi)
 {
@@ -4867,21 +4947,6 @@ static void rollback_registered(struct net_device *dev)
         rollback_registered_many(&single);
 }
 
-static void __netdev_init_queue_locks_one(struct net_device *dev,
-                                          struct netdev_queue *dev_queue,
-                                          void *_unused)
-{
-        spin_lock_init(&dev_queue->_xmit_lock);
-        netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
-        dev_queue->xmit_lock_owner = -1;
-}
-
-static void netdev_init_queue_locks(struct net_device *dev)
-{
-        netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
-        __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
-}
-
 unsigned long netdev_fix_features(unsigned long features, const char *name)
 {
         /* Fix illegal SG+CSUM combinations. */
@@ -4949,6 +5014,66 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev,
 }
 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
 
+static int netif_alloc_rx_queues(struct net_device *dev)
+{
+#ifdef CONFIG_RPS
+        unsigned int i, count = dev->num_rx_queues;
+        struct netdev_rx_queue *rx;
+
+        BUG_ON(count < 1);
+
+        rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
+        if (!rx) {
+                pr_err("netdev: Unable to allocate %u rx queues.\n", count);
+                return -ENOMEM;
+        }
+        dev->_rx = rx;
+
+        /*
+         * Set a pointer to first element in the array which holds the
+         * reference count.
+         */
+        for (i = 0; i < count; i++)
+                rx[i].first = rx;
+#endif
+        return 0;
+}
+
+static int netif_alloc_netdev_queues(struct net_device *dev)
+{
+        unsigned int count = dev->num_tx_queues;
+        struct netdev_queue *tx;
+
+        BUG_ON(count < 1);
+
+        tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
+        if (!tx) {
+                pr_err("netdev: Unable to allocate %u tx queues.\n",
+                       count);
+                return -ENOMEM;
+        }
+        dev->_tx = tx;
+        return 0;
+}
+
+static void netdev_init_one_queue(struct net_device *dev,
+                                  struct netdev_queue *queue,
+                                  void *_unused)
+{
+        queue->dev = dev;
+
+        /* Initialize queue lock */
+        spin_lock_init(&queue->_xmit_lock);
+        netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
+        queue->xmit_lock_owner = -1;
+}
+
+static void netdev_init_queues(struct net_device *dev)
+{
+        netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
+        spin_lock_init(&dev->tx_global_lock);
+}
+
 /**
  *      register_netdevice      - register a network device
  *      @dev: device to register
@@ -4982,28 +5107,19 @@ int register_netdevice(struct net_device *dev)
 
         spin_lock_init(&dev->addr_list_lock);
         netdev_set_addr_lockdep_class(dev);
-        netdev_init_queue_locks(dev);
 
         dev->iflink = -1;
 
-#ifdef CONFIG_RPS
-        if (!dev->num_rx_queues) {
-                /*
-                 * Allocate a single RX queue if driver never called
-                 * alloc_netdev_mq
-                 */
+        ret = netif_alloc_rx_queues(dev);
+        if (ret)
+                goto out;
 
-                dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
-                if (!dev->_rx) {
-                        ret = -ENOMEM;
-                        goto out;
-                }
+        ret = netif_alloc_netdev_queues(dev);
+        if (ret)
+                goto out;
+
+        netdev_init_queues(dev);
 
-                dev->_rx->first = dev->_rx;
-                atomic_set(&dev->_rx->count, 1);
-                dev->num_rx_queues = 1;
-        }
-#endif
         /* Init, if this function is available */
         if (dev->netdev_ops->ndo_init) {
                 ret = dev->netdev_ops->ndo_init(dev);
@@ -5043,6 +5159,12 @@ int register_netdevice(struct net_device *dev)
         if (dev->features & NETIF_F_SG)
                 dev->features |= NETIF_F_GSO;
 
+        /* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
+         * vlan_dev_init() will do the dev->features check, so these features
+         * are enabled only if supported by underlying device.
+         */
+        dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
+
         ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
         ret = notifier_to_errno(ret);
         if (ret)
@@ -5113,9 +5235,6 @@ int init_dummy_netdev(struct net_device *dev)
          */
         dev->reg_state = NETREG_DUMMY;
 
-        /* initialize the ref count */
-        atomic_set(&dev->refcnt, 1);
-
         /* NAPI wants this */
         INIT_LIST_HEAD(&dev->napi_list);
 
@@ -5123,6 +5242,11 @@ int init_dummy_netdev(struct net_device *dev)
         set_bit(__LINK_STATE_PRESENT, &dev->state);
         set_bit(__LINK_STATE_START, &dev->state);
 
+        /* Note : We dont allocate pcpu_refcnt for dummy devices,
+         * because users of this 'device' dont need to change
+         * its refcount.
+         */
+
         return 0;
 }
 EXPORT_SYMBOL_GPL(init_dummy_netdev);
@@ -5164,6 +5288,16 @@ out:
 }
 EXPORT_SYMBOL(register_netdev);
 
+int netdev_refcnt_read(const struct net_device *dev)
+{
+        int i, refcnt = 0;
+
+        for_each_possible_cpu(i)
+                refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
+        return refcnt;
+}
+EXPORT_SYMBOL(netdev_refcnt_read);
+
 /*
  * netdev_wait_allrefs - wait until all references are gone.
  *
@@ -5178,11 +5312,14 @@ EXPORT_SYMBOL(register_netdev);
 static void netdev_wait_allrefs(struct net_device *dev)
 {
         unsigned long rebroadcast_time, warning_time;
+        int refcnt;
 
         linkwatch_forget_dev(dev);
 
         rebroadcast_time = warning_time = jiffies;
-        while (atomic_read(&dev->refcnt) != 0) {
+        refcnt = netdev_refcnt_read(dev);
+
+        while (refcnt != 0) {
                 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
                         rtnl_lock();
 
@@ -5209,11 +5346,13 @@ static void netdev_wait_allrefs(struct net_device *dev)
 
                 msleep(250);
 
+                refcnt = netdev_refcnt_read(dev);
+
                 if (time_after(jiffies, warning_time + 10 * HZ)) {
                         printk(KERN_EMERG "unregister_netdevice: "
                                "waiting for %s to become free. Usage "
                                "count = %d\n",
-                               dev->name, atomic_read(&dev->refcnt));
+                               dev->name, refcnt);
                         warning_time = jiffies;
                 }
         }
@@ -5271,9 +5410,9 @@ void netdev_run_todo(void)
                 netdev_wait_allrefs(dev);
 
                 /* paranoia */
-                BUG_ON(atomic_read(&dev->refcnt));
-                WARN_ON(dev->ip_ptr);
-                WARN_ON(dev->ip6_ptr);
+                BUG_ON(netdev_refcnt_read(dev));
+                WARN_ON(rcu_dereference_raw(dev->ip_ptr));
+                WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
                 WARN_ON(dev->dn_ptr);
 
                 if (dev->destructor)
@@ -5350,30 +5489,34 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
 
         if (ops->ndo_get_stats64) {
                 memset(storage, 0, sizeof(*storage));
-                return ops->ndo_get_stats64(dev, storage);
-        }
-        if (ops->ndo_get_stats) {
+                ops->ndo_get_stats64(dev, storage);
+        } else if (ops->ndo_get_stats) {
                 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
-                return storage;
+        } else {
+                netdev_stats_to_stats64(storage, &dev->stats);
+                dev_txq_stats_fold(dev, storage);
         }
-        netdev_stats_to_stats64(storage, &dev->stats);
-        dev_txq_stats_fold(dev, storage);
+        storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
         return storage;
 }
 EXPORT_SYMBOL(dev_get_stats);
 
-static void netdev_init_one_queue(struct net_device *dev,
-                                  struct netdev_queue *queue,
-                                  void *_unused)
+struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
 {
-        queue->dev = dev;
-}
+        struct netdev_queue *queue = dev_ingress_queue(dev);
 
-static void netdev_init_queues(struct net_device *dev)
-{
-        netdev_init_one_queue(dev, &dev->rx_queue, NULL);
-        netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
-        spin_lock_init(&dev->tx_global_lock);
+#ifdef CONFIG_NET_CLS_ACT
+        if (queue)
+                return queue;
+        queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+        if (!queue)
+                return NULL;
+        netdev_init_one_queue(dev, queue, NULL);
+        queue->qdisc = &noop_qdisc;
+        queue->qdisc_sleeping = &noop_qdisc;
+        rcu_assign_pointer(dev->ingress_queue, queue);
+#endif
+        return queue;
 }
 
 /**
@@ -5390,17 +5533,18 @@ static void netdev_init_queues(struct net_device *dev)
 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
                 void (*setup)(struct net_device *), unsigned int queue_count)
 {
-        struct netdev_queue *tx;
         struct net_device *dev;
         size_t alloc_size;
         struct net_device *p;
-#ifdef CONFIG_RPS
-        struct netdev_rx_queue *rx;
-        int i;
-#endif
 
         BUG_ON(strlen(name) >= sizeof(dev->name));
 
+        if (queue_count < 1) {
+                pr_err("alloc_netdev: Unable to allocate device "
+                       "with zero queues.\n");
+                return NULL;
+        }
+
         alloc_size = sizeof(struct net_device);
         if (sizeof_priv) {
                 /* ensure 32-byte alignment of private area */
@@ -5416,55 +5560,31 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
                 return NULL;
         }
 
-        tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
-        if (!tx) {
-                printk(KERN_ERR "alloc_netdev: Unable to allocate "
-                       "tx qdiscs.\n");
-                goto free_p;
-        }
-
-#ifdef CONFIG_RPS
-        rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
-        if (!rx) {
-                printk(KERN_ERR "alloc_netdev: Unable to allocate "
-                       "rx queues.\n");
-                goto free_tx;
-        }
-
-        atomic_set(&rx->count, queue_count);
-
-        /*
-         * Set a pointer to first element in the array which holds the
-         * reference count.
-         */
-        for (i = 0; i < queue_count; i++)
-                rx[i].first = rx;
-#endif
-
         dev = PTR_ALIGN(p, NETDEV_ALIGN);
         dev->padded = (char *)dev - (char *)p;
 
+        dev->pcpu_refcnt = alloc_percpu(int);
+        if (!dev->pcpu_refcnt)
+                goto free_p;
+
         if (dev_addr_init(dev))
-                goto free_rx;
+                goto free_pcpu;
 
         dev_mc_init(dev);
         dev_uc_init(dev);
 
         dev_net_set(dev, &init_net);
 
-        dev->_tx = tx;
         dev->num_tx_queues = queue_count;
         dev->real_num_tx_queues = queue_count;
 
 #ifdef CONFIG_RPS
-        dev->_rx = rx;
         dev->num_rx_queues = queue_count;
+        dev->real_num_rx_queues = queue_count;
 #endif
 
         dev->gso_max_size = GSO_MAX_SIZE;
 
-        netdev_init_queues(dev);
-
         INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
         dev->ethtool_ntuple_list.count = 0;
         INIT_LIST_HEAD(&dev->napi_list);
@@ -5475,12 +5595,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
         strcpy(dev->name, name);
         return dev;
 
-free_rx:
-#ifdef CONFIG_RPS
-        kfree(rx);
-free_tx:
-#endif
-        kfree(tx);
+free_pcpu:
+        free_percpu(dev->pcpu_refcnt);
 free_p:
         kfree(p);
         return NULL;
@@ -5503,6 +5619,8 @@ void free_netdev(struct net_device *dev)
 
         kfree(dev->_tx);
 
+        kfree(rcu_dereference_raw(dev->ingress_queue));
+
         /* Flush device addresses */
         dev_addr_flush(dev);
 
@@ -5512,6 +5630,9 @@ void free_netdev(struct net_device *dev)
         list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
                 netif_napi_del(p);
 
+        free_percpu(dev->pcpu_refcnt);
+        dev->pcpu_refcnt = NULL;
+
         /*  Compatibility with error handling in drivers */
         if (dev->reg_state == NETREG_UNINITIALIZED) {
                 kfree((char *)dev - dev->padded);
@@ -5666,6 +5787,10 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 
         /* Notify protocols, that we are about to destroy
            this device. They should clean all the things.
+
+           Note that dev->reg_state stays at NETREG_REGISTERED.
+           This is wanted because this way 8021q and macvlan know
+           the device is just moving and can keep their slaves up.
         */
         call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
         call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);