can: Propagate SO_PRIORITY of raw sockets to skbs

This allows controlling certain queueing disciplines by setting the
socket's SO_PRIORITY option.

For example, with the default pfifo_fast queueing discipline, which
provides three priorities, socket priority TC_PRIO_CONTROL means
higher than default and TC_PRIO_BULK means lower than default.

Signed-off-by: Rostislav Lisovy <[e-mail]>
Signed-off-by: Michal Sojka <[e-mail]>
Acked-by: Oliver Hartkopp <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

net/can/raw.c

···
 
 	skb->dev = dev;
 	skb->sk  = sk;
+	skb->priority = sk->sk_priority;
 
 	err = can_send(skb, ro->loopback);