5 files changed, 114 insertions, 35 deletions

diff --git a/net/core/Makefile b/net/core/Makefile
index e9bd2467d5a9..2645ba428d48 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -7,7 +7,7 @@ obj-y := sock.o request_sock.o skbuff.o iovec.o datagram.o stream.o scm.o \
 
 obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
 
-obj-y                += dev.o ethtool.o dev_mcast.o dst.o \
+obj-y                += dev.o ethtool.o dev_mcast.o dst.o netevent.o \
                         neighbour.o rtnetlink.o utils.o link_watch.o filter.o
 
 obj-$(CONFIG_XFRM) += flow.o
diff --git a/net/core/dev.c b/net/core/dev.c
index 4d2b5167d7f5..d95e2626d944 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1166,11 +1166,6 @@ int skb_checksum_help(struct sk_buff *skb, int inward)
                 goto out_set_summed;
 
         if (unlikely(skb_shinfo(skb)->gso_size)) {
-                static int warned;
-
-                WARN_ON(!warned);
-                warned = 1;
-
                 /* Let GSO fix up the checksum. */
                 goto out_set_summed;
         }
@@ -1220,11 +1215,6 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
         __skb_pull(skb, skb->mac_len);
 
         if (unlikely(skb->ip_summed != CHECKSUM_HW)) {
-                static int warned;
-
-                WARN_ON(!warned);
-                warned = 1;
-
                 if (skb_header_cloned(skb) &&
                     (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
                         return ERR_PTR(err);
@@ -3429,12 +3419,9 @@ static void net_dma_rebalance(void)
         unsigned int cpu, i, n;
         struct dma_chan *chan;
 
-        lock_cpu_hotplug();
-
         if (net_dma_count == 0) {
                 for_each_online_cpu(cpu)
-                        rcu_assign_pointer(per_cpu(softnet_data.net_dma, cpu), NULL);
-                unlock_cpu_hotplug();
+                        rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
                 return;
         }
 
@@ -3447,15 +3434,13 @@ static void net_dma_rebalance(void)
                    + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
 
                 while(n) {
-                        per_cpu(softnet_data.net_dma, cpu) = chan;
+                        per_cpu(softnet_data, cpu).net_dma = chan;
                         cpu = next_cpu(cpu, cpu_online_map);
                         n--;
                 }
                 i++;
         }
         rcu_read_unlock();
-
-        unlock_cpu_hotplug();
 }
 
 /**
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 7ad681f5e712..5130d2efdbbe 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -29,6 +29,7 @@
 #include <net/neighbour.h>
 #include <net/dst.h>
 #include <net/sock.h>
+#include <net/netevent.h>
 #include <linux/rtnetlink.h>
 #include <linux/random.h>
 #include <linux/string.h>
@@ -754,6 +755,7 @@ static void neigh_timer_handler(unsigned long arg)
                         neigh->nud_state = NUD_STALE;
                         neigh->updated = jiffies;
                         neigh_suspect(neigh);
+                        notify = 1;
                 }
         } else if (state & NUD_DELAY) {
                 if (time_before_eq(now, 
@@ -762,6 +764,7 @@ static void neigh_timer_handler(unsigned long arg)
                         neigh->nud_state = NUD_REACHABLE;
                         neigh->updated = jiffies;
                         neigh_connect(neigh);
+                        notify = 1;
                         next = neigh->confirmed + neigh->parms->reachable_time;
                 } else {
                         NEIGH_PRINTK2("neigh %p is probed.\n", neigh);
@@ -819,6 +822,8 @@ static void neigh_timer_handler(unsigned long arg)
 out:
                 write_unlock(&neigh->lock);
         }
+        if (notify)
+                call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
 
 #ifdef CONFIG_ARPD
         if (notify && neigh->parms->app_probes)
@@ -926,9 +931,7 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
 {
         u8 old;
         int err;
-#ifdef CONFIG_ARPD
         int notify = 0;
-#endif
         struct net_device *dev;
         int update_isrouter = 0;
 
@@ -948,9 +951,7 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
                         neigh_suspect(neigh);
                 neigh->nud_state = new;
                 err = 0;
-#ifdef CONFIG_ARPD
                 notify = old & NUD_VALID;
-#endif
                 goto out;
         }
 
@@ -1022,9 +1023,7 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
                 if (!(new & NUD_CONNECTED))
                         neigh->confirmed = jiffies -
                                       (neigh->parms->base_reachable_time << 1);
-#ifdef CONFIG_ARPD
                 notify = 1;
-#endif
         }
         if (new == old)
                 goto out;
@@ -1056,6 +1055,9 @@ out:
                         (neigh->flags & ~NTF_ROUTER);
         }
         write_unlock_bh(&neigh->lock);
+
+        if (notify)
+                call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
 #ifdef CONFIG_ARPD
         if (notify && neigh->parms->app_probes)
                 neigh_app_notify(neigh);
diff --git a/net/core/netevent.c b/net/core/netevent.c
new file mode 100644
index 000000000000..35d02c38554e
--- /dev/null
+++ b/net/core/netevent.c
@@ -0,0 +1,69 @@
+/*
+ *      Network event notifiers
+ *
+ *      Authors:
+ *      Tom Tucker             <tom@opengridcomputing.com>
+ *      Steve Wise             <swise@opengridcomputing.com>
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *      Fixes:
+ */
+
+#include <linux/rtnetlink.h>
+#include <linux/notifier.h>
+
+static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
+
+/**
+ *      register_netevent_notifier - register a netevent notifier block
+ *      @nb: notifier
+ *
+ *      Register a notifier to be called when a netevent occurs.
+ *      The notifier passed is linked into the kernel structures and must
+ *      not be reused until it has been unregistered. A negative errno code
+ *      is returned on a failure.
+ */
+int register_netevent_notifier(struct notifier_block *nb)
+{
+        int err;
+
+        err = atomic_notifier_chain_register(&netevent_notif_chain, nb);
+        return err;
+}
+
+/**
+ *      netevent_unregister_notifier - unregister a netevent notifier block
+ *      @nb: notifier
+ *
+ *      Unregister a notifier previously registered by
+ *      register_neigh_notifier(). The notifier is unlinked into the
+ *      kernel structures and may then be reused. A negative errno code
+ *      is returned on a failure.
+ */
+
+int unregister_netevent_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
+}
+
+/**
+ *      call_netevent_notifiers - call all netevent notifier blocks
+ *      @val: value passed unmodified to notifier function
+ *      @v:   pointer passed unmodified to notifier function
+ *
+ *      Call all neighbour notifier blocks.  Parameters and return value
+ *      are as for notifier_call_chain().
+ */
+
+int call_netevent_notifiers(unsigned long val, void *v)
+{
+        return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
+}
+
+EXPORT_SYMBOL_GPL(register_netevent_notifier);
+EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
+EXPORT_SYMBOL_GPL(call_netevent_notifiers);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 476aa3978504..022d8894c11d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -71,13 +71,6 @@ static kmem_cache_t *skbuff_head_cache __read_mostly;
 static kmem_cache_t *skbuff_fclone_cache __read_mostly;
 
 /*
- * lockdep: lock class key used by skb_queue_head_init():
- */
-struct lock_class_key skb_queue_lock_key;
-
-EXPORT_SYMBOL(skb_queue_lock_key);
-
-/*
  *      Keep out-of-line to prevent kernel bloat.
  *      __builtin_return_address is not used because it is not always
  *      reliable.
@@ -256,6 +249,29 @@ nodata:
         goto out;
 }
 
+/**
+ *      __netdev_alloc_skb - allocate an skbuff for rx on a specific device
+ *      @dev: network device to receive on
+ *      @length: length to allocate
+ *      @gfp_mask: get_free_pages mask, passed to alloc_skb
+ *
+ *      Allocate a new &sk_buff and assign it a usage count of one. The
+ *      buffer has unspecified headroom built in. Users should allocate
+ *      the headroom they think they need without accounting for the
+ *      built in space. The built in space is used for optimisations.
+ *
+ *      %NULL is returned if there is no free memory.
+ */
+struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
+                unsigned int length, gfp_t gfp_mask)
+{
+        struct sk_buff *skb;
+
+        skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
+        if (likely(skb))
+                skb_reserve(skb, NET_SKB_PAD);
+        return skb;
+}
 
 static void skb_drop_list(struct sk_buff **listp)
 {
@@ -846,7 +862,11 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
             unlikely((err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))))
                 return err;
 
-        for (i = 0; i < nfrags; i++) {
+        i = 0;
+        if (offset >= len)
+                goto drop_pages;
+
+        for (; i < nfrags; i++) {
                 int end = offset + skb_shinfo(skb)->frags[i].size;
 
                 if (end < len) {
@@ -854,9 +874,9 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
                         continue;
                 }
 
-                if (len > offset)
-                        skb_shinfo(skb)->frags[i++].size = len - offset;
+                skb_shinfo(skb)->frags[i++].size = len - offset;
 
+drop_pages:
                 skb_shinfo(skb)->nr_frags = i;
 
                 for (; i < nfrags; i++)
@@ -864,7 +884,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
 
                 if (skb_shinfo(skb)->frag_list)
                         skb_drop_fraglist(skb);
-                break;
+                goto done;
         }
 
         for (fragp = &skb_shinfo(skb)->frag_list; (frag = *fragp);
@@ -879,6 +899,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
                                 return -ENOMEM;
 
                         nfrag->next = frag->next;
+                        kfree_skb(frag);
                         frag = nfrag;
                         *fragp = frag;
                 }
@@ -897,6 +918,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
                 break;
         }
 
+done:
         if (len > skb_headlen(skb)) {
                 skb->data_len -= skb->len - len;
                 skb->len       = len;
@@ -2042,6 +2064,7 @@ EXPORT_SYMBOL(__kfree_skb);
 EXPORT_SYMBOL(kfree_skb);
 EXPORT_SYMBOL(__pskb_pull_tail);
 EXPORT_SYMBOL(__alloc_skb);
+EXPORT_SYMBOL(__netdev_alloc_skb);
 EXPORT_SYMBOL(pskb_copy);
 EXPORT_SYMBOL(pskb_expand_head);
 EXPORT_SYMBOL(skb_checksum);