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net: bridge: use net_bridge_dst for fdb destinations

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Store fdb destinations in struct net_bridge_dst and access them through
the destination helpers. This doesn't change their representation or
behavior, fdb destinations still contain only bridge port pointers.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260930071411.2786201-3-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikolay Aleksandrov 2026-09-30 10:14:01 +03:00 committed by Jakub Kicinski
parent 13bb47965e
commit fd7a8eb03c
7 changed files with 58 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/trace/events/bridge.h
View File

@ -68,13 +68,14 @@ TRACE_EVENT(br_fdb_external_learn_add,
TRACE_EVENT(fdb_delete,
TP_PROTO(struct net_bridge *br, struct net_bridge_fdb_entry *f),
TP_PROTO(struct net_bridge *br, struct net_bridge_fdb_entry *f,
const struct net_bridge_port *dst),
TP_ARGS(br, f),
TP_ARGS(br, f, dst),
TP_STRUCT__entry(
__string(br_dev, br->dev->name)
__string(dev, f->dst ? f->dst->dev->name : "null")
__string(dev, dst ? dst->dev->name : "null")
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
),

4
net/bridge/br_arp_nd_proxy.c
View File

@ -223,7 +223,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
neigh_ha_snapshot(ha, n, n->dev);
f = br_fdb_find_rcu(br, ha, vid);
if (f) {
const struct net_bridge_port *dst = READ_ONCE(f->dst);
const struct net_bridge_port *dst = br_fdb_dst_port(f);
bool replied = false;
if ((p && test_bit(BR_PROXYARP_BIT, &p->flags)) ||
@ -500,7 +500,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
neigh_ha_snapshot(ha, n, n->dev);
f = br_fdb_find_rcu(br, ha, vid);
if (f) {
const struct net_bridge_port *dst = READ_ONCE(f->dst);
const struct net_bridge_port *dst = br_fdb_dst_port(f);
bool replied = false;
if (br_is_neigh_suppress_enabled_vid(dst, vid)) {

4
net/bridge/br_device.c
View File

@ -107,7 +107,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
else
br_flood(br, vlan, skb, BR_PKT_MULTICAST, false, true);
} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
br_forward(READ_ONCE(dst->dst), skb, false, true);
br_forward(br_fdb_dst_port(dst), skb, false, true);
} else {
br_flood(br, vlan, skb, BR_PKT_UNICAST, false, true);
}
@ -400,7 +400,7 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
if (!f)
return -1;
dst = READ_ONCE(f->dst);
dst = br_fdb_dst_port(f);
if (!dst)
return -1;

53
net/bridge/br_fdb.c
View File

@ -90,7 +90,7 @@ static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
const struct net_bridge_fdb_entry *fdb,
u32 portid, u32 seq, int type, unsigned int flags)
{
const struct net_bridge_port *dst = READ_ONCE(fdb->dst);
const struct net_bridge_port *dst = br_fdb_dst_port(fdb);
unsigned long now = jiffies;
struct nda_cacheinfo ci;
struct nlmsghdr *nlh;
@ -250,7 +250,7 @@ struct net_device *br_fdb_find_port(const struct net_device *br_dev,
rcu_read_lock();
f = br_fdb_find_rcu(br, addr, vid);
if (f) {
dst = READ_ONCE(f->dst);
dst = br_fdb_dst_port(f);
if (dst)
dev = dst->dev;
}
@ -315,7 +315,7 @@ static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
bool swdev_notify)
{
trace_fdb_delete(br, f);
trace_fdb_delete(br, f, br_fdb_dst_port(f));
if (test_bit(BR_FDB_STATIC, &f->flags))
fdb_del_hw_addr(br, f->key.addr.addr);
@ -350,7 +350,7 @@ static void fdb_delete_local(struct net_bridge *br,
vg = nbp_vlan_group(op);
if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
(!vid || br_vlan_find(vg, vid))) {
WRITE_ONCE(f->dst, op);
br_fdb_dst_write(f, br_port_to_dst(op));
clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
return;
}
@ -361,7 +361,7 @@ static void fdb_delete_local(struct net_bridge *br,
/* Maybe bridge device has same hw addr? */
if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
(!vid || (v && br_vlan_should_use(v)))) {
WRITE_ONCE(f->dst, NULL);
br_fdb_dst_write(f, br_port_to_dst(NULL));
clear_bit(BR_FDB_ADDED_BY_USER, &f->flags);
return;
}
@ -378,7 +378,8 @@ void br_fdb_find_delete_local(struct net_bridge *br,
spin_lock_bh(&br->hash_lock);
f = br_fdb_find(br, addr, vid);
if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
!test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p)
!test_bit(BR_FDB_ADDED_BY_USER, &f->flags) &&
br_fdb_dst_port(f) == p)
fdb_delete_local(br, p, f);
spin_unlock_bh(&br->hash_lock);
}
@ -408,7 +409,7 @@ static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
return NULL;
memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
WRITE_ONCE(fdb->dst, source);
br_fdb_dst_write(fdb, br_port_to_dst(source));
fdb->key.vlan_id = vid;
fdb->flags = flags;
fdb->updated = fdb->used = jiffies;
@ -470,7 +471,7 @@ void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
spin_lock_bh(&br->hash_lock);
vg = nbp_vlan_group(p);
hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
if (READ_ONCE(f->dst) == p &&
if (br_fdb_dst_port(f) == p &&
test_bit(BR_FDB_LOCAL, &f->flags) &&
!test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) {
/* delete old one */
@ -517,7 +518,8 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
/* If old entry was unassociated with any port, then delete it. */
f = br_fdb_find(br, br->dev->dev_addr, 0);
if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
!br_fdb_dst_port(f) &&
!test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
fdb_delete_local(br, NULL, f);
fdb_add_local(br, NULL, newaddr, 0);
@ -533,7 +535,8 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
continue;
f = br_fdb_find(br, br->dev->dev_addr, v->vid);
if (f && test_bit(BR_FDB_LOCAL, &f->flags) &&
!f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
!br_fdb_dst_port(f) &&
!test_bit(BR_FDB_ADDED_BY_USER, &f->flags))
fdb_delete_local(br, NULL, f);
fdb_add_local(br, NULL, newaddr, v->vid);
}
@ -693,7 +696,7 @@ static bool __fdb_flush_matches(const struct net_bridge *br,
const struct net_bridge_fdb_entry *f,
const struct net_bridge_fdb_flush_desc *desc)
{
const struct net_bridge_port *dst = READ_ONCE(f->dst);
const struct net_bridge_port *dst = br_fdb_dst_port(f);
int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex;
if (desc->vlan_id && desc->vlan_id != f->key.vlan_id)
@ -879,7 +882,7 @@ void br_fdb_delete_by_port(struct net_bridge *br,
spin_lock_bh(&br->hash_lock);
hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
if (READ_ONCE(f->dst) != p)
if (br_fdb_dst_port(f) != p)
continue;
if (!do_all)
@ -921,7 +924,7 @@ int br_fdb_fillbuf(struct net_bridge *br, void *buf,
continue;
/* ignore pseudo entry for local MAC address */
dst = READ_ONCE(f->dst);
dst = br_fdb_dst_port(f);
if (!dst)
continue;
@ -996,10 +999,10 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
}
/* fastpath: update of existing entry */
if (unlikely(source != READ_ONCE(fdb->dst) &&
if (unlikely(source != br_fdb_dst_port(fdb) &&
!test_bit(BR_FDB_STICKY, &fdb->flags))) {
br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH);
WRITE_ONCE(fdb->dst, source);
br_fdb_dst_write(fdb, br_port_to_dst(source));
fdb_modified = true;
/* Take over HW learned entry */
if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN,
@ -1061,17 +1064,17 @@ int br_fdb_dump(struct sk_buff *skb,
rcu_read_lock();
hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
const struct net_bridge_port *dst = READ_ONCE(f->dst);
const struct net_bridge_port *dst = br_fdb_dst_port(f);
if (*idx < ctx->fdb_idx)
goto skip;
if (filter_dev && (!dst || dst->dev != filter_dev)) {
if (filter_dev != dev)
goto skip;
/* !f->dst is a special case for bridge
/* A NULL destination is a special case for bridge
* It means the MAC belongs to the bridge
* Therefore need a little more filtering
* we only want to dump the !f->dst case
* we only want to dump the NULL destination case
*/
if (dst)
goto skip;
@ -1193,8 +1196,8 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
if (flags & NLM_F_EXCL)
return -EEXIST;
if (READ_ONCE(fdb->dst) != source) {
WRITE_ONCE(fdb->dst, source);
if (br_fdb_dst_port(fdb) != source) {
br_fdb_dst_write(fdb, br_port_to_dst(source));
modified = true;
}
@ -1385,7 +1388,7 @@ static int fdb_delete_by_addr_and_port(struct net_bridge *br,
struct net_bridge_fdb_entry *fdb;
fdb = br_fdb_find(br, addr, vlan);
if (!fdb || READ_ONCE(fdb->dst) != p)
if (!fdb || br_fdb_dst_port(fdb) != p)
return -ENOENT;
fdb_delete(br, fdb, true);
@ -1541,15 +1544,15 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
} else {
if (locked &&
(!test_bit(BR_FDB_LOCKED, &fdb->flags) ||
READ_ONCE(fdb->dst) != p)) {
br_fdb_dst_port(fdb) != p)) {
err = -EINVAL;
goto err_unlock;
}
WRITE_ONCE(fdb->updated, jiffies);
if (READ_ONCE(fdb->dst) != p) {
WRITE_ONCE(fdb->dst, p);
if (br_fdb_dst_port(fdb) != p) {
br_fdb_dst_write(fdb, br_port_to_dst(p));
modified = true;
}
@ -1632,7 +1635,7 @@ void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
spin_lock_bh(&p->br->hash_lock);
hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
if (READ_ONCE(f->dst) == p && f->key.vlan_id == vid)
if (br_fdb_dst_port(f) == p && f->key.vlan_id == vid)
clear_bit(BR_FDB_OFFLOADED, &f->flags);
}
spin_unlock_bh(&p->br->hash_lock);

4
net/bridge/br_input.c
View File

@ -123,7 +123,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
br_fdb_update(br, p, eth_hdr(skb)->h_source,
vid, BIT(BR_FDB_LOCKED));
goto drop;
} else if (READ_ONCE(fdb_src->dst) != p ||
} else if (br_fdb_dst_port(fdb_src) != p ||
test_bit(BR_FDB_LOCAL, &fdb_src->flags)) {
/* FDB mismatch. Drop the packet without roaming. */
goto drop;
@ -223,7 +223,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
if (now != READ_ONCE(dst->used))
WRITE_ONCE(dst->used, now);
br_forward(READ_ONCE(dst->dst), skb, local_rcv, false);
br_forward(br_fdb_dst_port(dst), skb, local_rcv, false);
} else {
if (!mcast_hit)
br_flood(br, vlan, skb, pkt_type, local_rcv, false);

20
net/bridge/br_private.h
View File

@ -312,7 +312,7 @@ struct net_bridge_dst {
struct net_bridge_fdb_entry {
struct rhash_head rhnode;
struct net_bridge_port *dst;
struct net_bridge_dst dst;
struct net_bridge_fdb_key key;
struct hlist_node fdb_node;
@ -708,6 +708,24 @@ br_dst_port(struct net_bridge_dst dst)
return (struct net_bridge_port *)ACCESS_PRIVATE(&dst, value);
}
static inline struct net_bridge_dst
br_fdb_dst_read(const struct net_bridge_fdb_entry *fdb)
{
return br_dst_read(&fdb->dst);
}
static inline void br_fdb_dst_write(struct net_bridge_fdb_entry *fdb,
struct net_bridge_dst dst)
{
br_dst_write(&fdb->dst, dst);
}
static inline struct net_bridge_port *
br_fdb_dst_port(const struct net_bridge_fdb_entry *fdb)
{
return br_dst_port(br_fdb_dst_read(fdb));
}
/* called under bridge lock */
static inline int br_is_root_bridge(const struct net_bridge *br)
{

2
net/bridge/br_switchdev.c
View File

@ -129,7 +129,7 @@ static void br_switchdev_fdb_populate(struct net_bridge *br,
const struct net_bridge_fdb_entry *fdb,
const void *ctx)
{
const struct net_bridge_port *p = READ_ONCE(fdb->dst);
const struct net_bridge_port *p = br_fdb_dst_port(fdb);
item->addr = fdb->key.addr.addr;
item->vid = fdb->key.vlan_id;