1 files changed, 106 insertions, 43 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 812a5f3c2abe..97873e31661c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -63,30 +63,69 @@ struct wireless_dev;
 #define HAVE_FREE_NETDEV                /* free_netdev() */
 #define HAVE_NETDEV_PRIV                /* netdev_priv() */
 
-#define NET_XMIT_SUCCESS        0
-#define NET_XMIT_DROP           1       /* skb dropped                  */
-#define NET_XMIT_CN             2       /* congestion notification      */
-#define NET_XMIT_POLICED        3       /* skb is shot by police        */
-#define NET_XMIT_MASK           0xFFFF  /* qdisc flags in net/sch_generic.h */
-
 /* Backlog congestion levels */
-#define NET_RX_SUCCESS          0   /* keep 'em coming, baby */
-#define NET_RX_DROP             1  /* packet dropped */
+#define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
+#define NET_RX_DROP             1       /* packet dropped */
+
+/*
+ * Transmit return codes: transmit return codes originate from three different
+ * namespaces:
+ *
+ * - qdisc return codes
+ * - driver transmit return codes
+ * - errno values
+ *
+ * Drivers are allowed to return any one of those in their hard_start_xmit()
+ * function. Real network devices commonly used with qdiscs should only return
+ * the driver transmit return codes though - when qdiscs are used, the actual
+ * transmission happens asynchronously, so the value is not propagated to
+ * higher layers. Virtual network devices transmit synchronously, in this case
+ * the driver transmit return codes are consumed by dev_queue_xmit(), all
+ * others are propagated to higher layers.
+ */
+
+/* qdisc ->enqueue() return codes. */
+#define NET_XMIT_SUCCESS        0x00
+#define NET_XMIT_DROP           0x01    /* skb dropped                  */
+#define NET_XMIT_CN             0x02    /* congestion notification      */
+#define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
+#define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */
 
 /* 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_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
 #define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
 
 /* Driver transmit return codes */
+#define NETDEV_TX_MASK          0xf0
+
 enum netdev_tx {
-        NETDEV_TX_OK = 0,       /* driver took care of packet */
-        NETDEV_TX_BUSY,         /* driver tx path was busy*/
-        NETDEV_TX_LOCKED = -1,  /* driver tx lock was already taken */
+        __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
+        NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
+        NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
+        NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
 };
 typedef enum netdev_tx netdev_tx_t;
 
+/*
+ * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
+ * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
+ */
+static inline bool dev_xmit_complete(int rc)
+{
+        /*
+         * Positive cases with an skb consumed by a driver:
+         * - successful transmission (rc == NETDEV_TX_OK)
+         * - error while transmitting (rc < 0)
+         * - error while queueing to a different device (rc & NET_XMIT_MASK)
+         */
+        if (likely(rc < NET_XMIT_MASK))
+                return true;
+
+        return false;
+}
+
 #endif
 
 #define MAX_ADDR_LEN    32              /* Largest hardware address length */
@@ -125,8 +164,7 @@ typedef enum netdev_tx netdev_tx_t;
  *      with byte counters.
  */
 
-struct net_device_stats
-{
+struct net_device_stats {
         unsigned long   rx_packets;             /* total packets received       */
         unsigned long   tx_packets;             /* total packets transmitted    */
         unsigned long   rx_bytes;               /* total bytes received         */
@@ -179,8 +217,7 @@ struct neighbour;
 struct neigh_parms;
 struct sk_buff;
 
-struct netif_rx_stats
-{
+struct netif_rx_stats {
         unsigned total;
         unsigned dropped;
         unsigned time_squeeze;
@@ -189,8 +226,7 @@ struct netif_rx_stats
 
 DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);
 
-struct dev_addr_list
-{
+struct dev_addr_list {
         struct dev_addr_list    *next;
         u8                      da_addr[MAX_ADDR_LEN];
         u8                      da_addrlen;
@@ -227,8 +263,7 @@ struct netdev_hw_addr_list {
         int                     count;
 };
 
-struct hh_cache
-{
+struct hh_cache {
         struct hh_cache *hh_next;       /* Next entry                        */
         atomic_t        hh_refcnt;      /* number of users                   */
 /*
@@ -291,8 +326,7 @@ struct header_ops {
  * code.
  */
 
-enum netdev_state_t
-{
+enum netdev_state_t {
         __LINK_STATE_START,
         __LINK_STATE_PRESENT,
         __LINK_STATE_NOCARRIER,
@@ -341,20 +375,20 @@ struct napi_struct {
         struct sk_buff          *skb;
 };
 
-enum
-{
+enum {
         NAPI_STATE_SCHED,       /* Poll is scheduled */
         NAPI_STATE_DISABLE,     /* Disable pending */
         NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
 };
 
-enum {
+enum gro_result {
         GRO_MERGED,
         GRO_MERGED_FREE,
         GRO_HELD,
         GRO_NORMAL,
         GRO_DROP,
 };
+typedef enum gro_result gro_result_t;
 
 extern void __napi_schedule(struct napi_struct *n);
 
@@ -457,8 +491,7 @@ static inline void napi_synchronize(const struct napi_struct *n)
 # define napi_synchronize(n)    barrier()
 #endif
 
-enum netdev_queue_state_t
-{
+enum netdev_queue_state_t {
         __QUEUE_STATE_XOFF,
         __QUEUE_STATE_FROZEN,
 };
@@ -635,6 +668,10 @@ struct net_device_ops {
                                                       unsigned int sgc);
         int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
                                                      u16 xid);
+#define NETDEV_FCOE_WWNN 0
+#define NETDEV_FCOE_WWPN 1
+        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
+                                                    u64 *wwn, int type);
 #endif
 };
 
@@ -648,8 +685,7 @@ struct net_device_ops {
  *      moves out.
  */
 
-struct net_device
-{
+struct net_device {
 
         /*
          * This is the first field of the "visible" part of this structure
@@ -683,6 +719,7 @@ struct net_device
 
         struct list_head        dev_list;
         struct list_head        napi_list;
+        struct list_head        unreg_list;
 
         /* Net device features */
         unsigned long           features;
@@ -859,7 +896,7 @@ struct net_device
         /* device index hash chain */
         struct hlist_node       index_hlist;
 
-        struct net_device       *link_watch_next;
+        struct list_head        link_watch_list;
 
         /* register/unregister state machine */
         enum { NETREG_UNINITIALIZED=0,
@@ -894,8 +931,8 @@ struct net_device
 
         /* class/net/name entry */
         struct device           dev;
-        /* space for optional statistics and wireless sysfs groups */
-        const struct attribute_group *sysfs_groups[3];
+        /* space for optional device, statistics, and wireless sysfs groups */
+        const struct attribute_group *sysfs_groups[4];
 
         /* rtnetlink link ops */
         const struct rtnl_link_ops *rtnl_link_ops;
@@ -909,7 +946,7 @@ struct net_device
 
 #ifdef CONFIG_DCB
         /* Data Center Bridging netlink ops */
-        struct dcbnl_rtnl_ops *dcbnl_ops;
+        const struct dcbnl_rtnl_ops *dcbnl_ops;
 #endif
 
 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
@@ -1075,10 +1112,14 @@ extern rwlock_t				dev_base_lock;		/* Device list lock */
 
 #define for_each_netdev(net, d)         \
                 list_for_each_entry(d, &(net)->dev_base_head, dev_list)
+#define for_each_netdev_rcu(net, d)             \
+                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
 #define for_each_netdev_safe(net, d, n) \
                 list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
 #define for_each_netdev_continue(net, d)                \
                 list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
+#define for_each_netdev_continue_rcu(net, d)            \
+        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
 #define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)
 
 static inline struct net_device *next_net_device(struct net_device *dev)
@@ -1091,6 +1132,16 @@ static inline struct net_device *next_net_device(struct net_device *dev)
         return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 }
 
+static inline struct net_device *next_net_device_rcu(struct net_device *dev)
+{
+        struct list_head *lh;
+        struct net *net;
+
+        net = dev_net(dev);
+        lh = rcu_dereference(dev->dev_list.next);
+        return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
+}
+
 static inline struct net_device *first_net_device(struct net *net)
 {
         return list_empty(&net->dev_base_head) ? NULL :
@@ -1109,6 +1160,7 @@ extern void		__dev_remove_pack(struct packet_type *pt);
 extern struct net_device        *dev_get_by_flags(struct net *net, unsigned short flags,
                                                   unsigned short mask);
 extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
+extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
 extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
 extern int              dev_alloc_name(struct net_device *dev, const char *name);
 extern int              dev_open(struct net_device *dev);
@@ -1116,7 +1168,14 @@ extern int		dev_close(struct net_device *dev);
 extern void             dev_disable_lro(struct net_device *dev);
 extern int              dev_queue_xmit(struct sk_buff *skb);
 extern int              register_netdevice(struct net_device *dev);
-extern void             unregister_netdevice(struct net_device *dev);
+extern void             unregister_netdevice_queue(struct net_device *dev,
+                                                   struct list_head *head);
+extern void             unregister_netdevice_many(struct list_head *head);
+static inline void unregister_netdevice(struct net_device *dev)
+{
+        unregister_netdevice_queue(dev, NULL);
+}
+
 extern void             free_netdev(struct net_device *dev);
 extern void             synchronize_net(void);
 extern int              register_netdevice_notifier(struct notifier_block *nb);
@@ -1127,6 +1186,7 @@ extern void		netdev_resync_ops(struct net_device *dev);
 extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
 extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
 extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
+extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
 extern int              dev_restart(struct net_device *dev);
 #ifdef CONFIG_NETPOLL_TRAP
 extern int              netpoll_trap(void);
@@ -1212,8 +1272,7 @@ static inline int unregister_gifconf(unsigned int family)
  * Incoming packets are placed on per-cpu queues so that
  * no locking is needed.
  */
-struct softnet_data
-{
+struct softnet_data {
         struct Qdisc            *output_queue;
         struct sk_buff_head     input_pkt_queue;
         struct list_head        poll_list;
@@ -1467,18 +1526,19 @@ extern int		netif_rx_ni(struct sk_buff *skb);
 #define HAVE_NETIF_RECEIVE_SKB 1
 extern int              netif_receive_skb(struct sk_buff *skb);
 extern void             napi_gro_flush(struct napi_struct *napi);
-extern int              dev_gro_receive(struct napi_struct *napi,
+extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
                                         struct sk_buff *skb);
-extern int              napi_skb_finish(int ret, struct sk_buff *skb);
-extern int              napi_gro_receive(struct napi_struct *napi,
+extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
+extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
                                          struct sk_buff *skb);
 extern void             napi_reuse_skb(struct napi_struct *napi,
                                        struct sk_buff *skb);
 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
-extern int              napi_frags_finish(struct napi_struct *napi,
-                                          struct sk_buff *skb, int ret);
+extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
+                                          struct sk_buff *skb,
+                                          gro_result_t ret);
 extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
-extern int              napi_gro_frags(struct napi_struct *napi);
+extern gro_result_t     napi_gro_frags(struct napi_struct *napi);
 
 static inline void napi_free_frags(struct napi_struct *napi)
 {
@@ -1540,6 +1600,7 @@ static inline void dev_hold(struct net_device *dev)
  */
 
 extern void linkwatch_fire_event(struct net_device *dev);
+extern void linkwatch_forget_dev(struct net_device *dev);
 
 /**
  *      netif_carrier_ok - test if carrier present
@@ -1609,7 +1670,8 @@ static inline int netif_dormant(const struct net_device *dev)
  *
  * Check if carrier is operational
  */
-static inline int netif_oper_up(const struct net_device *dev) {
+static inline int netif_oper_up(const struct net_device *dev)
+{
         return (dev->operstate == IF_OPER_UP ||
                 dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
 }
@@ -1880,6 +1942,7 @@ extern void		netdev_features_change(struct net_device *dev);
 extern void             dev_load(struct net *net, const char *name);
 extern void             dev_mcast_init(void);
 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
+extern void             dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
 
 extern int              netdev_max_backlog;
 extern int              weight_p;