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Linux/net/bridge/br_switchdev.c

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  1 #include <linux/kernel.h>
  2 #include <linux/list.h>
  3 #include <linux/netdevice.h>
  4 #include <linux/rtnetlink.h>
  5 #include <linux/skbuff.h>
  6 #include <net/switchdev.h>
  7 
  8 #include "br_private.h"
  9 
 10 static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev)
 11 {
 12         struct net_bridge_port *p;
 13 
 14         /* dev is yet to be added to the port list. */
 15         list_for_each_entry(p, &br->port_list, list) {
 16                 if (switchdev_port_same_parent_id(dev, p->dev))
 17                         return p->offload_fwd_mark;
 18         }
 19 
 20         return ++br->offload_fwd_mark;
 21 }
 22 
 23 int nbp_switchdev_mark_set(struct net_bridge_port *p)
 24 {
 25         struct switchdev_attr attr = {
 26                 .orig_dev = p->dev,
 27                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 28         };
 29         int err;
 30 
 31         ASSERT_RTNL();
 32 
 33         err = switchdev_port_attr_get(p->dev, &attr);
 34         if (err) {
 35                 if (err == -EOPNOTSUPP)
 36                         return 0;
 37                 return err;
 38         }
 39 
 40         p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev);
 41 
 42         return 0;
 43 }
 44 
 45 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
 46                               struct sk_buff *skb)
 47 {
 48         if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
 49                 BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
 50 }
 51 
 52 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 53                                   const struct sk_buff *skb)
 54 {
 55         return !skb->offload_fwd_mark ||
 56                BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
 57 }
 58 

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