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[78.154.14.127]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4a017b67813sm18243925e9.2.2026.09.30.00.14.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 00:14:59 -0700 (PDT) From: Nikolay Aleksandrov To: netdev@vger.kernel.org Cc: idosch@nvidia.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, bridge@lists.linux.dev, Nikolay Aleksandrov , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers Subject: [PATCH net-next 02/12] net: bridge: use net_bridge_dst for fdb destinations Date: Wed, 30 Sep 2026 10:14:01 +0300 Message-ID: <20260930071411.2786201-3-razor@blackwall.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260930071411.2786201-1-razor@blackwall.org> References: <20260930071411.2786201-1-razor@blackwall.org> Precedence: bulk X-Mailing-List: bridge@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Nikolay Aleksandrov --- CC: Steven Rostedt CC: Masami Hiramatsu CC: Mathieu Desnoyers include/trace/events/bridge.h | 7 +++-- net/bridge/br_arp_nd_proxy.c | 4 +-- net/bridge/br_device.c | 4 +-- net/bridge/br_fdb.c | 53 ++++++++++++++++++----------------- net/bridge/br_input.c | 4 +-- net/bridge/br_private.h | 20 ++++++++++++- net/bridge/br_switchdev.c | 2 +- 7 files changed, 58 insertions(+), 36 deletions(-) diff --git a/include/trace/events/bridge.h b/include/trace/events/bridge.h index 3fe4725c83ff..f676516b33fa 100644 --- a/include/trace/events/bridge.h +++ b/include/trace/events/bridge.h @@ -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) ), diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c index da15f4d7c1ae..ba4a63840b21 100644 --- a/net/bridge/br_arp_nd_proxy.c +++ b/net/bridge/br_arp_nd_proxy.c @@ -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)) { diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index ce9ea9ac3d0a..c6804409b60b 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -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; diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index e4570bbed854..0f5cf5615b56 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -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); diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 4357d78524a6..68aa8fa52eba 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -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); diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 1146187aa2ba..bbb59b53e745 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -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) { diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c index 990c6b38fd39..10f3aea6a1f8 100644 --- a/net/bridge/br_switchdev.c +++ b/net/bridge/br_switchdev.c @@ -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; -- 2.47.3