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can: introduce CAN midlayer private and allocate it automatically

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This patch introduces the CAN midlayer private structure ("struct
can_ml_priv") which should be used to hold protocol specific per device
data structures. For now it's only member is "struct can_dev_rcv_lists".

The CAN midlayer private is allocated via alloc_netdev()'s private and
assigned to "struct net_device::ml_priv" during device creation. This is
done transparently for CAN drivers using alloc_candev(). The slcan, vcan
and vxcan drivers which are not using alloc_candev() have been adopted
manually. The memory layout of the netdev_priv allocated via
alloc_candev() will looke like this:

  +-------------------------+
  | driver's priv           |
  +-------------------------+
  | struct can_ml_priv      |
  +-------------------------+
  | array of struct sk_buff |
  +-------------------------+

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2018-10-08 09:02:38 +02:00
parent 3f15035606
commit ffd956eef6
8 changed files with 96 additions and 23 deletions
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22
drivers/net/can/dev.c
View file

@ -12,6 +12,7 @@
#include <linux/if_arp.h>
#include <linux/workqueue.h>
#include <linux/can.h>
#include <linux/can/can-ml.h>
#include <linux/can/dev.h>
#include <linux/can/skb.h>
#include <linux/can/netlink.h>
@ -718,11 +719,24 @@ struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
struct can_priv *priv;
int size;
/* We put the driver's priv, the CAN mid layer priv and the
* echo skb into the netdevice's priv. The memory layout for
* the netdev_priv is like this:
*
* +-------------------------+
* | driver's priv |
* +-------------------------+
* | struct can_ml_priv |
* +-------------------------+
* | array of struct sk_buff |
* +-------------------------+
*/
size = ALIGN(sizeof_priv, NETDEV_ALIGN) + sizeof(struct can_ml_priv);
if (echo_skb_max)
size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
size = ALIGN(size, sizeof(struct sk_buff *)) +
echo_skb_max * sizeof(struct sk_buff *);
else
size = sizeof_priv;
dev = alloc_netdev_mqs(size, "can%d", NET_NAME_UNKNOWN, can_setup,
txqs, rxqs);
@ -735,7 +749,7 @@ struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
if (echo_skb_max) {
priv->echo_skb_max = echo_skb_max;
priv->echo_skb = (void *)priv +
ALIGN(sizeof_priv, sizeof(struct sk_buff *));
(size - echo_skb_max * sizeof(struct sk_buff *));
}
priv->state = CAN_STATE_STOPPED;