LXR linux/net/bridge/br

   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
  11static 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
  24int 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
  43void 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
  50bool 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
  61int br_switchdev_set_port_flag(struct net_bridge_port *p,
  62                               unsigned long flags,
  63                               unsigned long mask,
  64                               struct netlink_ext_ack *extack)
  65{
  66        struct switchdev_attr attr = {
  67                .orig_dev = p->dev,
  68        };
  69        struct switchdev_notifier_port_attr_info info = {
  70                .attr = &attr,
  71        };
  72        int err;
  73
  74        mask &= BR_PORT_FLAGS_HW_OFFLOAD;
  75        if (!mask)
  76                return 0;
  77
  78        attr.id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS;
  79        attr.u.brport_flags.val = flags;
  80        attr.u.brport_flags.mask = mask;
  81
  82        /* We run from atomic context here */
  83        err = call_switchdev_notifiers(SWITCHDEV_PORT_ATTR_SET, p->dev,
  84                                       &info.info, extack);
  85        err = notifier_to_errno(err);
  86        if (err == -EOPNOTSUPP)
  87                return 0;
  88
  89        if (err) {
  90                if (extack && !extack->_msg)
  91                        NL_SET_ERR_MSG_MOD(extack,
  92                                           "bridge flag offload is not supported");
  93                return -EOPNOTSUPP;
  94        }
  95
  96        attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
  97        attr.flags = SWITCHDEV_F_DEFER;
  98
  99        err = switchdev_port_attr_set(p->dev, &attr, extack);
 100        if (err) {
 101                if (extack && !extack->_msg)
 102                        NL_SET_ERR_MSG_MOD(extack,
 103                                           "error setting offload flag on port");
 104                return err;
 105        }
 106
 107        return 0;
 108}
 109
 110void
 111br_switchdev_fdb_notify(struct net_bridge *br,
 112                        const struct net_bridge_fdb_entry *fdb, int type)
 113{
 114        const struct net_bridge_port *dst = READ_ONCE(fdb->dst);
 115        struct net_device *dev = dst ? dst->dev : br->dev;
 116        struct switchdev_notifier_fdb_info info = {
 117                .addr = fdb->key.addr.addr,
 118                .vid = fdb->key.vlan_id,
 119                .added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags),
 120                .is_local = test_bit(BR_FDB_LOCAL, &fdb->flags),
 121                .offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags),
 122        };
 123
 124        switch (type) {
 125        case RTM_DELNEIGH:
 126                call_switchdev_notifiers(SWITCHDEV_FDB_DEL_TO_DEVICE,
 127                                         dev, &info.info, NULL);
 128                break;
 129        case RTM_NEWNEIGH:
 130                call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_DEVICE,
 131                                         dev, &info.info, NULL);
 132                break;
 133        }
 134}
 135
 136int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
 137                               struct netlink_ext_ack *extack)
 138{
 139        struct switchdev_obj_port_vlan v = {
 140                .obj.orig_dev = dev,
 141                .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 142                .flags = flags,
 143                .vid = vid,
 144        };
 145
 146        return switchdev_port_obj_add(dev, &v.obj, extack);
 147}
 148
 149int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
 150{
 151        struct switchdev_obj_port_vlan v = {
 152                .obj.orig_dev = dev,
 153                .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 154                .vid = vid,
 155        };
 156
 157        return switchdev_port_obj_del(dev, &v.obj);
 158}
 159