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can: make the number of echo skb's configurable

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This patch allows the CAN controller driver to define the number of echo
skb's used for the local loopback (echo), as suggested by Kurt Van
Dijck, with the function:

  struct net_device *alloc_candev(int sizeof_priv,
                                  unsigned int echo_skb_max);

The CAN drivers have been adapted accordingly. For the ems_usb driver,
as suggested by Sebastian Haas, the number of echo skb's has been
increased to 10, which improves the transmission performance a lot.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger 2009-10-08 22:17:11 +00:00 • committed by David S. Miller
parent 61321bbd62
commit a6e4bc5304
7 changed files with 42 additions and 23 deletions
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16
include/linux/can/dev.h
View file

@ -29,8 +29,6 @@ enum can_mode {
/*
* CAN common private data
*/
#define CAN_ECHO_SKB_MAX 4
struct can_priv {
struct can_device_stats can_stats;
@ -44,15 +42,16 @@ struct can_priv {
int restart_ms;
struct timer_list restart_timer;
struct sk_buff *echo_skb[CAN_ECHO_SKB_MAX];
int (*do_set_bittiming)(struct net_device *dev);
int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
int (*do_get_state)(const struct net_device *dev,
enum can_state *state);
unsigned int echo_skb_max;
struct sk_buff **echo_skb;
};
struct net_device *alloc_candev(int sizeof_priv);
struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
void free_candev(struct net_device *dev);
int open_candev(struct net_device *dev);
@ -64,8 +63,9 @@ void unregister_candev(struct net_device *dev);
int can_restart_now(struct net_device *dev);
void can_bus_off(struct net_device *dev);
void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, int idx);
void can_get_echo_skb(struct net_device *dev, int idx);
void can_free_echo_skb(struct net_device *dev, int idx);
void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int idx);
void can_get_echo_skb(struct net_device *dev, unsigned int idx);
void can_free_echo_skb(struct net_device *dev, unsigned int idx);
#endif /* CAN_DEV_H */