Merge tag 'linux-can-next-for-5.4-20190904' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2019-09-04 j1939

this is a pull request for net-next/master consisting of 21 patches.

the first 12 patches are by me and target the CAN core infrastructure.
They clean up the names of variables , structs and struct members,
convert can_rx_register() to use max() instead of open coding it and
remove unneeded code from the can_pernet_exit() callback.

The next three patches are also by me and they introduce and make use of
the CAN midlayer private structure. It is used to hold protocol specific
per device data structures.

The next patch is by Oleksij Rempel, switches the
&net->can.rcvlists_lock from a spin_lock() to a spin_lock_bh(), so that
it can be used from NAPI (soft IRQ) context.

The next 4 patches are by Kurt Van Dijck, he first updates his email
address via mailmap and then extends sockaddr_can to include j1939
members.

The final patch is the collective effort of many entities (The j1939
authors: Oliver Hartkopp, Bastian Stender, Elenita Hinds, kbuild test
robot, Kurt Van Dijck, Maxime Jayat, Robin van der Gracht, Oleksij
Rempel, Marc Kleine-Budde). It adds support of SAE J1939 protocol to the
CAN networking stack.

SAE J1939 is the vehicle bus recommended practice used for communication
and diagnostics among vehicle components. Originating in the car and
heavy-duty truck industry in the United States, it is now widely used in
other parts of the world.

P.S.: This pull request doesn't invalidate my last pull request:
      "pull-request: can-next 2019-09-03".
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 0929c7d83e15..ac86be52b461 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -11,6 +11,7 @@
 #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>
@@ -713,11 +714,24 @@ 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);
@@ -727,10 +741,12 @@ struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
 	priv = netdev_priv(dev);
 	priv->dev = dev;
 
+	dev->ml_priv = (void *)priv + ALIGN(sizeof_priv, NETDEV_ALIGN);
+
 	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;