netdev: change transmit to limited range type

[linux-beck.git] / include / linux / netdevice.h

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 60d3aac49ed485ca9ac2657d11ccc87500cbd6c5..376a2e1ac00d33db0e22557703079b356c0ccbda 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -79,17 +79,19 @@ struct wireless_dev;
 #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 */
+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 */
+};
+typedef enum netdev_tx netdev_tx_t;
+
 #endif
 
 #define MAX_ADDR_LEN   32              /* Largest hardware address length */
 
-/* Driver transmit return codes */
-#define NETDEV_TX_OK 0         /* driver took care of packet */
-#define NETDEV_TX_BUSY 1       /* driver tx path was busy*/
-#define NETDEV_TX_LOCKED -1    /* driver tx lock was already taken */
-
 #ifdef  __KERNEL__
-
 /*
  *     Compute the worst case header length according to the protocols
  *     used.
@@ -507,9 +509,11 @@ struct netdev_queue {
  *     This function is called when network device transistions to the down
  *     state.
  *
- * int (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev);
+ * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
+ *                               struct net_device *dev);
  *     Called when a packet needs to be transmitted.
- *     Must return NETDEV_TX_OK , NETDEV_TX_BUSY, or NETDEV_TX_LOCKED,
+ *     Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
+ *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
  *     Required can not be NULL.
  *
  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
@@ -580,7 +584,7 @@ struct net_device_ops {
        void                    (*ndo_uninit)(struct net_device *dev);
        int                     (*ndo_open)(struct net_device *dev);
        int                     (*ndo_stop)(struct net_device *dev);
-       int                     (*ndo_start_xmit) (struct sk_buff *skb,
+       netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
                                                   struct net_device *dev);
        u16                     (*ndo_select_queue)(struct net_device *dev,
                                                    struct sk_buff *skb);