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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 (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                                 bool added_by_user, bool offloaded)
107 {
108         struct switchdev_notifier_fdb_info info;
109         unsigned long notifier_type;
110 
111         info.addr = mac;
112         info.vid = vid;
113         info.added_by_user = added_by_user;
114         info.offloaded = offloaded;
115         notifier_type = adding ? SWITCHDEV_FDB_ADD_TO_DEVICE : SWITCHDEV_FDB_DEL_TO_DEVICE;
116         call_switchdev_notifiers(notifier_type, dev, &info.info);
117 }
118 
119 void
120 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
121 {
122         if (!fdb->dst)
123                 return;
124 
125         switch (type) {
126         case RTM_DELNEIGH:
127                 br_switchdev_fdb_call_notifiers(false, fdb->key.addr.addr,
128                                                 fdb->key.vlan_id,
129                                                 fdb->dst->dev,
130                                                 fdb->added_by_user,
131                                                 fdb->offloaded);
132                 break;
133         case RTM_NEWNEIGH:
134                 br_switchdev_fdb_call_notifiers(true, fdb->key.addr.addr,
135                                                 fdb->key.vlan_id,
136                                                 fdb->dst->dev,
137                                                 fdb->added_by_user,
138                                                 fdb->offloaded);
139                 break;
140         }
141 }
142 
143 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags)
144 {
145         struct switchdev_obj_port_vlan v = {
146                 .obj.orig_dev = dev,
147                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
148                 .flags = flags,
149                 .vid_begin = vid,
150                 .vid_end = vid,
151         };
152 
153         return switchdev_port_obj_add(dev, &v.obj);
154 }
155 
156 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
157 {
158         struct switchdev_obj_port_vlan v = {
159                 .obj.orig_dev = dev,
160                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
161                 .vid_begin = vid,
162                 .vid_end = vid,
163         };
164 
165         return switchdev_port_obj_del(dev, &v.obj);
166 }
167 

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