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netdev: change transmit to limited range type 

The transmit function should only return one of three possible values,
some drivers got confused and returned errno's or other values.
This changes the definition so that this can be caught at compile time.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2009-08-31 19:50:40 +00:00 committed by David S. Miller
parent 9e39f7c5b3
commit dc1f8bf68b
1 changed files with 13 additions and 9 deletions
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22
include/linux/netdevice.h
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@ -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);