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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/can/at91_can.c
View File

@ -1087,7 +1087,7 @@ static int __init at91_can_probe(struct platform_device *pdev)
goto exit_release;
}
dev = alloc_candev(sizeof(struct at91_priv));
dev = alloc_candev(sizeof(struct at91_priv), AT91_MB_TX_NUM);
if (!dev) {
err = -ENOMEM;
goto exit_iounmap;

32
drivers/net/can/dev.c
View File

@ -245,7 +245,7 @@ static void can_flush_echo_skb(struct net_device *dev)
struct net_device_stats *stats = &dev->stats;
int i;
for (i = 0; i < CAN_ECHO_SKB_MAX; i++) {
for (i = 0; i < priv->echo_skb_max; i++) {
if (priv->echo_skb[i]) {
kfree_skb(priv->echo_skb[i]);
priv->echo_skb[i] = NULL;
@ -262,10 +262,13 @@ static void can_flush_echo_skb(struct net_device *dev)
* of the device driver. The driver must protect access to
* priv->echo_skb, if necessary.
*/
void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, int idx)
void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int idx)
{
struct can_priv *priv = netdev_priv(dev);
BUG_ON(idx >= priv->echo_skb_max);
/* check flag whether this packet has to be looped back */
if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK) {
kfree_skb(skb);
@ -311,10 +314,12 @@ EXPORT_SYMBOL_GPL(can_put_echo_skb);
* is handled in the device driver. The driver must protect
* access to priv->echo_skb, if necessary.
*/
void can_get_echo_skb(struct net_device *dev, int idx)
void can_get_echo_skb(struct net_device *dev, unsigned int idx)
{
struct can_priv *priv = netdev_priv(dev);
BUG_ON(idx >= priv->echo_skb_max);
if (priv->echo_skb[idx]) {
netif_rx(priv->echo_skb[idx]);
priv->echo_skb[idx] = NULL;
@ -327,10 +332,12 @@ EXPORT_SYMBOL_GPL(can_get_echo_skb);
*
* The function is typically called when TX failed.
*/
void can_free_echo_skb(struct net_device *dev, int idx)
void can_free_echo_skb(struct net_device *dev, unsigned int idx)
{
struct can_priv *priv = netdev_priv(dev);
BUG_ON(idx >= priv->echo_skb_max);
if (priv->echo_skb[idx]) {
kfree_skb(priv->echo_skb[idx]);
priv->echo_skb[idx] = NULL;
@ -445,17 +452,30 @@ static void can_setup(struct net_device *dev)
/*
* Allocate and setup space for the CAN network device
*/
struct net_device *alloc_candev(int sizeof_priv)
struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max)
{
struct net_device *dev;
struct can_priv *priv;
int size;
dev = alloc_netdev(sizeof_priv, "can%d", can_setup);
if (echo_skb_max)
size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
echo_skb_max * sizeof(struct sk_buff *);
else
size = sizeof_priv;
dev = alloc_netdev(size, "can%d", can_setup);
if (!dev)
return NULL;
priv = netdev_priv(dev);
if (echo_skb_max) {
priv->echo_skb_max = echo_skb_max;
priv->echo_skb = (void *)priv +
ALIGN(sizeof_priv, sizeof(struct sk_buff *));
}
priv->state = CAN_STATE_STOPPED;
init_timer(&priv->restart_timer);

3
drivers/net/can/sja1000/sja1000.c
View File

@ -565,7 +565,8 @@ struct net_device *alloc_sja1000dev(int sizeof_priv)
struct net_device *dev;
struct sja1000_priv *priv;
dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv);
dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
SJA1000_ECHO_SKB_MAX);
if (!dev)
return NULL;

2
drivers/net/can/sja1000/sja1000.h
View File

@ -50,6 +50,8 @@
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>
#define SJA1000_ECHO_SKB_MAX 1 /* the SJA1000 has one TX buffer object */
#define SJA1000_MAX_IRQ 20 /* max. number of interrupts handled in ISR */
/* SJA1000 registers - manual section 6.4 (Pelican Mode) */

6
drivers/net/can/ti_hecc.c
View File

@ -74,10 +74,6 @@ MODULE_VERSION(HECC_MODULE_VERSION);
#define HECC_MB_TX_SHIFT 2 /* as per table above */
#define HECC_MAX_TX_MBOX BIT(HECC_MB_TX_SHIFT)
#if (HECC_MAX_TX_MBOX > CAN_ECHO_SKB_MAX)
#error "HECC: MAX TX mailboxes should be equal or less than CAN_ECHO_SKB_MAX"
#endif
#define HECC_TX_PRIO_SHIFT (HECC_MB_TX_SHIFT)
#define HECC_TX_PRIO_MASK (MAX_TX_PRIO << HECC_MB_TX_SHIFT)
#define HECC_TX_MB_MASK (HECC_MAX_TX_MBOX - 1)
@ -902,7 +898,7 @@ static int ti_hecc_probe(struct platform_device *pdev)
goto probe_exit_free_region;
}
ndev = alloc_candev(sizeof(struct ti_hecc_priv));
ndev = alloc_candev(sizeof(struct ti_hecc_priv), HECC_MAX_TX_MBOX);
if (!ndev) {
dev_err(&pdev->dev, "alloc_candev failed\n");
err = -ENOMEM;

4
drivers/net/can/usb/ems_usb.c
View File

@ -232,7 +232,7 @@ MODULE_DEVICE_TABLE(usb, ems_usb_table);
#define INTR_IN_BUFFER_SIZE 4
#define MAX_RX_URBS 10
#define MAX_TX_URBS CAN_ECHO_SKB_MAX
#define MAX_TX_URBS 10
struct ems_usb;
@ -1012,7 +1012,7 @@ static int ems_usb_probe(struct usb_interface *intf,
struct ems_usb *dev;
int i, err = -ENOMEM;
netdev = alloc_candev(sizeof(struct ems_usb));
netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
if (!netdev) {
dev_err(netdev->dev.parent, "Couldn't alloc candev\n");
return -ENOMEM;

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 */