1 files changed, 16 insertions, 9 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 83b8c4f1d69..fea0d9db684 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -30,6 +30,7 @@
 #include <linux/if_packet.h>
 
 #ifdef __KERNEL__
+#include <linux/timer.h>
 #include <asm/atomic.h>
 #include <asm/cache.h>
 #include <asm/byteorder.h>
@@ -38,7 +39,6 @@
 #include <linux/percpu.h>
 #include <linux/dmaengine.h>
 
-struct divert_blk;
 struct vlan_group;
 struct ethtool_ops;
 struct netpoll_info;
@@ -67,6 +67,10 @@ struct netpoll_info;
 #define NET_RX_CN_HIGH          4   /* The storm is here */
 #define NET_RX_BAD              5  /* packet dropped due to kernel error */
 
+/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
+ * indicates that the device will soon be dropping packets, or already drops
+ * some packets of the same priority; prompting us to send less aggressively. */
+#define net_xmit_eval(e)        ((e) == NET_XMIT_CN? 0 : (e))
 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
 
 #endif
@@ -189,13 +193,20 @@ struct hh_cache
 {
         struct hh_cache *hh_next;       /* Next entry                        */
         atomic_t        hh_refcnt;      /* number of users                   */
-        __be16          hh_type;        /* protocol identifier, f.e ETH_P_IP
+/*
+ * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
+ * cache line on SMP.
+ * They are mostly read, but hh_refcnt may be changed quite frequently,
+ * incurring cache line ping pongs.
+ */
+        __be16          hh_type ____cacheline_aligned_in_smp;
+                                        /* protocol identifier, f.e ETH_P_IP
                                          *  NOTE:  For VLANs, this will be the
                                          *  encapuslated type. --BLG
                                          */
-        int             hh_len;         /* length of header */
+        u16             hh_len;         /* length of header */
         int             (*hh_output)(struct sk_buff *skb);
-        rwlock_t        hh_lock;
+        seqlock_t       hh_lock;
 
         /* cached hardware header; allow for machine alignment needs.        */
 #define HH_DATA_MOD     16
@@ -517,11 +528,6 @@ struct net_device
         /* bridge stuff */
         struct net_bridge_port  *br_port;
 
-#ifdef CONFIG_NET_DIVERT
-        /* this will get initialized at each interface type init routine */
-        struct divert_blk       *divert;
-#endif /* CONFIG_NET_DIVERT */
-
         /* class/net/name entry */
         struct class_device     class_dev;
         /* space for optional statistics and wireless sysfs groups */
@@ -900,6 +906,7 @@ static inline void netif_poll_disable(struct net_device *dev)
 
 static inline void netif_poll_enable(struct net_device *dev)
 {
+        smp_mb__before_clear_bit();
         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 }