#include <linux/kernel.h>#include <linux/list.h>#include <linux/netdevice.h>#include <linux/rtnetlink.h>#include <linux/skbuff.h>#include <net/switchdev.h> #include "br_private.h" static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev){	struct net_bridge_port *p; 	/* dev is yet to be added to the port list. */	list_for_each_entry(p, &br->port_list, list) {		if (switchdev_port_same_parent_id(dev, p->dev))			return p->offload_fwd_mark;	} 	return ++br->offload_fwd_mark;} int nbp_switchdev_mark_set(struct net_bridge_port *p){	struct switchdev_attr attr = {		.orig_dev = p->dev,		.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,	};	int err; 	ASSERT_RTNL(); 	err = switchdev_port_attr_get(p->dev, &attr);	if (err) {		if (err == -EOPNOTSUPP)			return 0;		return err;	} 	p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev); 	return 0;} void nbp_switchdev_frame_mark(const struct net_bridge_port *p,			      struct sk_buff *skb){	if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))		BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;} bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,				  const struct sk_buff *skb){	return !skb->offload_fwd_mark ||	       BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;}