net/bridge/br_switchdev.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/list.h>
   4 #include <linux/netdevice.h>
   5 #include <linux/rtnetlink.h>
   6 #include <linux/skbuff.h>
   7 #include <net/switchdev.h>
   8
   9 #include "br_private.h"
  10
  11 static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev)
  12 {
  13         struct net_bridge_port *p;
  14
  15         /* dev is yet to be added to the port list. */
  16         list_for_each_entry(p, &br->port_list, list) {
  17                 if (switchdev_port_same_parent_id(dev, p->dev))
  18                         return p->offload_fwd_mark;
  19         }
  20
  21         return ++br->offload_fwd_mark;
  22 }
  23
  24 int nbp_switchdev_mark_set(struct net_bridge_port *p)
  25 {
  26         struct switchdev_attr attr = {
  27                 .orig_dev = p->dev,
  28                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
  29         };
  30         int err;
  31
  32         ASSERT_RTNL();
  33
  34         err = switchdev_port_attr_get(p->dev, &attr);
  35         if (err) {
  36                 if (err == -EOPNOTSUPP)
  37                         return 0;
  38                 return err;
  39         }
  40
  41         p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev);
  42
  43         return 0;
  44 }
  45
  46 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
  47                               struct sk_buff *skb)
  48 {
  49         if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
  50                 BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
  51 }
  52
  53 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
  54                                   const struct sk_buff *skb)
  55 {
  56         return !skb->offload_fwd_mark ||
  57                BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
  58 }
  59
  60 /* Flags that can be offloaded to hardware */
  61 #define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
  62                                   BR_MCAST_FLOOD | BR_BCAST_FLOOD)
  63
  64 int br_switchdev_set_port_flag(struct net_bridge_port *p,
  65                                unsigned long flags,
  66                                unsigned long mask)
  67 {
  68         struct switchdev_attr attr = {
  69                 .orig_dev = p->dev,
  70                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
  71         };
  72         int err;
  73
  74         if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
  75                 return 0;
  76
  77         err = switchdev_port_attr_get(p->dev, &attr);
  78         if (err == -EOPNOTSUPP)
  79                 return 0;
  80         if (err)
  81                 return err;
  82
  83         /* Check if specific bridge flag attribute offload is supported */
  84         if (!(attr.u.brport_flags_support & mask)) {
  85                 br_warn(p->br, "bridge flag offload is not supported %u(%s)\n",
  86                         (unsigned int)p->port_no, p->dev->name);
  87                 return -EOPNOTSUPP;
  88         }
  89
  90         attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
  91         attr.flags = SWITCHDEV_F_DEFER;
  92         attr.u.brport_flags = flags;
  93         err = switchdev_port_attr_set(p->dev, &attr);
  94         if (err) {
  95                 br_warn(p->br, "error setting offload flag on port %u(%s)\n",
  96                         (unsigned int)p->port_no, p->dev->name);
  97                 return err;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static void
 104 br_switchdev_fdb_call_notifiers(bool adding, const unsigned char *mac,
 105                                 u16 vid, struct net_device *dev)
 106 {
 107         struct switchdev_notifier_fdb_info info;
 108         unsigned long notifier_type;
 109
 110         info.addr = mac;
 111         info.vid = vid;
 112         notifier_type = adding ? SWITCHDEV_FDB_ADD_TO_DEVICE : SWITCHDEV_FDB_DEL_TO_DEVICE;
 113         call_switchdev_notifiers(notifier_type, dev, &info.info);
 114 }
 115
 116 void
 117 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
 118 {
 119         if (!fdb->added_by_user || !fdb->dst)
 120                 return;
 121
 122         switch (type) {
 123         case RTM_DELNEIGH:
 124                 br_switchdev_fdb_call_notifiers(false, fdb->addr.addr,
 125                                                 fdb->vlan_id,
 126                                                 fdb->dst->dev);
 127                 break;
 128         case RTM_NEWNEIGH:
 129                 br_switchdev_fdb_call_notifiers(true, fdb->addr.addr,
 130                                                 fdb->vlan_id,
 131                                                 fdb->dst->dev);
 132                 break;
 133         }
 134 }