diff options
author | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-10-08 09:02:38 +0200 |
---|---|---|
committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2019-09-04 13:29:14 +0200 |
commit | ffd956eef69b212a724b1cc4cdc61828f3ad9104 (patch) | |
tree | c5366f9a90ed84c736c32ddc03c854299f456cc9 /drivers/net/can/dev.c | |
parent | 3f15035606934a499975e4a5879a9499f072c179 (diff) |
can: introduce CAN midlayer private and allocate it automatically
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>
Diffstat (limited to 'drivers/net/can/dev.c')
-rw-r--r-- | drivers/net/can/dev.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 483d270664cc..9e688dc29521 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -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; |