net/bridge/br_switchdev.c

   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 }