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Linux/net/bridge/br_switchdev.c

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  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 (netdev_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 netdev_phys_item_id ppid = { };
 27         int err;
 28 
 29         ASSERT_RTNL();
 30 
 31         err = dev_get_port_parent_id(p->dev, &ppid, true);
 32         if (err) {
 33                 if (err == -EOPNOTSUPP)
 34                         return 0;
 35                 return err;
 36         }
 37 
 38         p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev);
 39 
 40         return 0;
 41 }
 42 
 43 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
 44                               struct sk_buff *skb)
 45 {
 46         if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
 47                 BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
 48 }
 49 
 50 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 51                                   const struct sk_buff *skb)
 52 {
 53         return !skb->offload_fwd_mark ||
 54                BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
 55 }
 56 
 57 /* Flags that can be offloaded to hardware */
 58 #define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
 59                                   BR_MCAST_FLOOD | BR_BCAST_FLOOD)
 60 
 61 int br_switchdev_set_port_flag(struct net_bridge_port *p,
 62                                unsigned long flags,
 63                                unsigned long mask)
 64 {
 65         struct switchdev_attr attr = {
 66                 .orig_dev = p->dev,
 67                 .id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
 68                 .u.brport_flags = mask,
 69         };
 70         struct switchdev_notifier_port_attr_info info = {
 71                 .attr = &attr,
 72         };
 73         int err;
 74 
 75         if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
 76                 return 0;
 77 
 78         /* We run from atomic context here */
 79         err = call_switchdev_notifiers(SWITCHDEV_PORT_ATTR_SET, p->dev,
 80                                        &info.info, NULL);
 81         err = notifier_to_errno(err);
 82         if (err == -EOPNOTSUPP)
 83                 return 0;
 84 
 85         if (err) {
 86                 br_warn(p->br, "bridge flag offload is not supported %u(%s)\n",
 87                         (unsigned int)p->port_no, p->dev->name);
 88                 return -EOPNOTSUPP;
 89         }
 90 
 91         attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
 92         attr.flags = SWITCHDEV_F_DEFER;
 93         attr.u.brport_flags = flags;
 94 
 95         err = switchdev_port_attr_set(p->dev, &attr);
 96         if (err) {
 97                 br_warn(p->br, "error setting offload flag on port %u(%s)\n",
 98                         (unsigned int)p->port_no, p->dev->name);
 99                 return err;
100         }
101 
102         return 0;
103 }
104 
105 static void
106 br_switchdev_fdb_call_notifiers(bool adding, const unsigned char *mac,
107                                 u16 vid, struct net_device *dev,
108                                 bool added_by_user, bool offloaded)
109 {
110         struct switchdev_notifier_fdb_info info;
111         unsigned long notifier_type;
112 
113         info.addr = mac;
114         info.vid = vid;
115         info.added_by_user = added_by_user;
116         info.offloaded = offloaded;
117         notifier_type = adding ? SWITCHDEV_FDB_ADD_TO_DEVICE : SWITCHDEV_FDB_DEL_TO_DEVICE;
118         call_switchdev_notifiers(notifier_type, dev, &info.info, NULL);
119 }
120 
121 void
122 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
123 {
124         if (!fdb->dst)
125                 return;
126 
127         switch (type) {
128         case RTM_DELNEIGH:
129                 br_switchdev_fdb_call_notifiers(false, fdb->key.addr.addr,
130                                                 fdb->key.vlan_id,
131                                                 fdb->dst->dev,
132                                                 test_bit(BR_FDB_ADDED_BY_USER,
133                                                          &fdb->flags),
134                                                 test_bit(BR_FDB_OFFLOADED,
135                                                          &fdb->flags));
136                 break;
137         case RTM_NEWNEIGH:
138                 br_switchdev_fdb_call_notifiers(true, fdb->key.addr.addr,
139                                                 fdb->key.vlan_id,
140                                                 fdb->dst->dev,
141                                                 test_bit(BR_FDB_ADDED_BY_USER,
142                                                          &fdb->flags),
143                                                 test_bit(BR_FDB_OFFLOADED,
144                                                          &fdb->flags));
145                 break;
146         }
147 }
148 
149 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
150                                struct netlink_ext_ack *extack)
151 {
152         struct switchdev_obj_port_vlan v = {
153                 .obj.orig_dev = dev,
154                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
155                 .flags = flags,
156                 .vid_begin = vid,
157                 .vid_end = vid,
158         };
159 
160         return switchdev_port_obj_add(dev, &v.obj, extack);
161 }
162 
163 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
164 {
165         struct switchdev_obj_port_vlan v = {
166                 .obj.orig_dev = dev,
167                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
168                 .vid_begin = vid,
169                 .vid_end = vid,
170         };
171 
172         return switchdev_port_obj_del(dev, &v.obj);
173 }
174 

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