Merge branch 'net-bridge-convert-bool-options-to-bits'

Nikolay Aleksandrov says:

====================
net: bridge: convert bool options to bits

A lot of boolean bridge options have been added around the net_bridge
structure resulting in holes and more importantly different cache lines
that need to be fetched in the fast path. This set moves all of those
to bits in a bitfield which resides in a hot cache line thus reducing
the size of net_bridge, the number of holes and the number of cache
lines needed for the fast path.
The set is also sent in preparation for new boolean options to avoid
spreading them in the structure and making new holes.
One nice side-effect is that we avoid potential race conditions by using
the bitops since some of the options were bits being directly set in
parallel risking hard to debug issues (has_ipv6_addr).

Before:
 size: 1184, holes: 8, sum holes: 30
After:
 size: 1160, holes: 3, sum holes: 7

Patch 01 is a trivial style fix
Patch 02 adds the new options bitfield and converts the vlan boolean
         options to bits
Patches 03-08 convert the rest of the boolean options to bits
Patch 09 re-arranges a few fields in net_bridge to further reduce size

v2: patch 09: remove the comment about offload_fwd_mark in net_bridge and
    leave it where it is now, thanks to Ido for spotting it
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br.c

@@ -175,6 +175,22 @@ static struct notifier_block br_switchdev_notifier = {
 	.notifier_call = br_switchdev_event,
 };
 
+void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
+{
+	bool cur = !!br_opt_get(br, opt);
+
+	br_debug(br, "toggle option: %d state: %d -> %d\n",
+		 opt, cur, on);
+
+	if (cur == on)
+		return;
+
+	if (on)
+		set_bit(opt, &br->options);
+	else
+		clear_bit(opt, &br->options);
+}
+
 static void __net_exit br_net_exit(struct net *net)
 {
 	struct net_device *dev;

net/bridge/br_arp_nd_proxy.c

@@ -39,7 +39,7 @@ void br_recalculate_neigh_suppress_enabled(struct net_bridge *br)
 		}
 	}
 
-	br->neigh_suppress_enabled = neigh_suppress;
+	br_opt_toggle(br, BROPT_NEIGH_SUPPRESS_ENABLED, neigh_suppress);
 }
 
 #if IS_ENABLED(CONFIG_INET)
@@ -155,7 +155,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
 	    ipv4_is_multicast(tip))
 		return;
 
-	if (br->neigh_suppress_enabled) {
+	if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
 		if (p && (p->flags & BR_NEIGH_SUPPRESS))
 			return;
 		if (ipv4_is_zeronet(sip) || sip == tip) {
@@ -175,7 +175,8 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
 			return;
 	}
 
-	if (br->neigh_suppress_enabled && br_is_local_ip(vlandev, tip)) {
+	if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
+	    br_is_local_ip(vlandev, tip)) {
 		/* its our local ip, so don't proxy reply
 		 * and don't forward to neigh suppress ports
 		 */
@@ -213,7 +214,8 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
 			/* If we have replied or as long as we know the
 			 * mac, indicate to arp replied
 			 */
-			if (replied || br->neigh_suppress_enabled)
+			if (replied ||
+			    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
 				BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
 		}
 
@@ -460,7 +462,8 @@ void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
 			 * mac, indicate to NEIGH_SUPPRESS ports that we
 			 * have replied
 			 */
-			if (replied || br->neigh_suppress_enabled)
+			if (replied ||
+			    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
 				BR_INPUT_SKB_CB(skb)->proxyarp_replied = true;
 		}
 		neigh_release(n);

net/bridge/br_device.c

@@ -67,11 +67,11 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (IS_ENABLED(CONFIG_INET) &&
 	    (eth->h_proto == htons(ETH_P_ARP) ||
 	     eth->h_proto == htons(ETH_P_RARP)) &&
-	    br->neigh_suppress_enabled) {
+	    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
 		br_do_proxy_suppress_arp(skb, br, vid, NULL);
 	} else if (IS_ENABLED(CONFIG_IPV6) &&
 		   skb->protocol == htons(ETH_P_IPV6) &&
-		   br->neigh_suppress_enabled &&
+		   br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
 		   pskb_may_pull(skb, sizeof(struct ipv6hdr) +
 				 sizeof(struct nd_msg)) &&
 		   ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
@@ -228,7 +228,7 @@ static int br_change_mtu(struct net_device *dev, int new_mtu)
 	dev->mtu = new_mtu;
 
 	/* this flag will be cleared if the MTU was automatically adjusted */
-	br->mtu_set_by_user = true;
+	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	/* remember the MTU in the rtable for PMTU */
 	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);

net/bridge/br_if.c

@@ -508,14 +508,14 @@ void br_mtu_auto_adjust(struct net_bridge *br)
 	ASSERT_RTNL();
 
 	/* if the bridge MTU was manually configured don't mess with it */
-	if (br->mtu_set_by_user)
+	if (br_opt_get(br, BROPT_MTU_SET_BY_USER))
 		return;
 
 	/* change to the minimum MTU and clear the flag which was set by
 	 * the bridge ndo_change_mtu callback
 	 */
 	dev_set_mtu(br->dev, br_mtu_min(br));
-	br->mtu_set_by_user = false;
+	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, false);
 }
 
 static void br_set_gso_limits(struct net_bridge *br)

net/bridge/br_input.c

@@ -122,7 +122,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 		br_do_proxy_suppress_arp(skb, br, vid, p);
 	} else if (IS_ENABLED(CONFIG_IPV6) &&
 		   skb->protocol == htons(ETH_P_IPV6) &&
-		   br->neigh_suppress_enabled &&
+		   br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
 		   pskb_may_pull(skb, sizeof(struct ipv6hdr) +
 				 sizeof(struct nd_msg)) &&
 		   ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {

net/bridge/br_mdb.c

@@ -84,7 +84,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
 	int i, err = 0;
 	int idx = 0, s_idx = cb->args[1];
 
-	if (br->multicast_disabled)
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return 0;
 
 	mdb = rcu_dereference(br->mdb);
@@ -598,7 +598,7 @@ static int __br_mdb_add(struct net *net, struct net_bridge *br,
 	struct net_bridge_port *p;
 	int ret;
 
-	if (!netif_running(br->dev) || br->multicast_disabled)
+	if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return -EINVAL;
 
 	dev = __dev_get_by_index(net, entry->ifindex);
@@ -673,7 +673,7 @@ static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
 	struct br_ip ip;
 	int err = -EINVAL;
 
-	if (!netif_running(br->dev) || br->multicast_disabled)
+	if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return -EINVAL;
 
 	__mdb_entry_to_br_ip(entry, &ip);

net/bridge/br_multicast.c

@@ -158,7 +158,7 @@ struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 	struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 	struct br_ip ip;
 
-	if (br->multicast_disabled)
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return NULL;
 
 	if (BR_INPUT_SKB_CB(skb)->igmp)
@@ -411,7 +411,7 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 	iph->frag_off = htons(IP_DF);
 	iph->ttl = 1;
 	iph->protocol = IPPROTO_IGMP;
-	iph->saddr = br->multicast_query_use_ifaddr ?
+	iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
 		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 	((u8 *)&iph[1])[0] = IPOPT_RA;
@@ -503,11 +503,11 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 			       &ip6h->saddr)) {
 		kfree_skb(skb);
-		br->has_ipv6_addr = 0;
+		br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
 		return NULL;
 	}
 
-	br->has_ipv6_addr = 1;
+	br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
 	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 
 	hopopt = (u8 *)(ip6h + 1);
@@ -628,7 +628,7 @@ static struct net_bridge_mdb_entry *br_multicast_get_group(
 				port ? port->dev->name : br->dev->name);
 			err = -E2BIG;
 disable:
-			br->multicast_disabled = 1;
+			br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
 			goto err;
 		}
 	}
@@ -894,7 +894,7 @@ static void br_multicast_querier_expired(struct net_bridge *br,
 					 struct bridge_mcast_own_query *query)
 {
 	spin_lock(&br->multicast_lock);
-	if (!netif_running(br->dev) || br->multicast_disabled)
+	if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		goto out;
 
 	br_multicast_start_querier(br, query);
@@ -965,8 +965,9 @@ static void br_multicast_send_query(struct net_bridge *br,
 	struct br_ip br_group;
 	unsigned long time;
 
-	if (!netif_running(br->dev) || br->multicast_disabled ||
-	    !br->multicast_querier)
+	if (!netif_running(br->dev) ||
+	    !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
+	    !br_opt_get(br, BROPT_MULTICAST_QUERIER))
 		return;
 
 	memset(&br_group.u, 0, sizeof(br_group.u));
@@ -1036,7 +1037,7 @@ static void br_mc_disabled_update(struct net_device *dev, bool value)
 		.orig_dev = dev,
 		.id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
 		.flags = SWITCHDEV_F_DEFER,
-		.u.mc_disabled = value,
+		.u.mc_disabled = !value,
 	};
 
 	switchdev_port_attr_set(dev, &attr);
@@ -1054,7 +1055,8 @@ int br_multicast_add_port(struct net_bridge_port *port)
 	timer_setup(&port->ip6_own_query.timer,
 		    br_ip6_multicast_port_query_expired, 0);
 #endif
-	br_mc_disabled_update(port->dev, port->br->multicast_disabled);
+	br_mc_disabled_update(port->dev,
+			      br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
 
 	port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
 	if (!port->mcast_stats)
@@ -1091,7 +1093,7 @@ static void __br_multicast_enable_port(struct net_bridge_port *port)
 {
 	struct net_bridge *br = port->br;
 
-	if (br->multicast_disabled || !netif_running(br->dev))
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
 		return;
 
 	br_multicast_enable(&port->ip4_own_query);
@@ -1634,7 +1636,7 @@ br_multicast_leave_group(struct net_bridge *br,
 	if (timer_pending(&other_query->timer))
 		goto out;
 
-	if (br->multicast_querier) {
+	if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
 		__br_multicast_send_query(br, port, &mp->addr);
 
 		time = jiffies + br->multicast_last_member_count *
@@ -1746,7 +1748,7 @@ static void br_multicast_err_count(const struct net_bridge *br,
 	struct bridge_mcast_stats __percpu *stats;
 	struct bridge_mcast_stats *pstats;
 
-	if (!br->multicast_stats_enabled)
+	if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
 		return;
 
 	if (p)
@@ -1904,7 +1906,7 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 	BR_INPUT_SKB_CB(skb)->igmp = 0;
 	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
 
-	if (br->multicast_disabled)
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return 0;
 
 	switch (skb->protocol) {
@@ -1956,8 +1958,6 @@ void br_multicast_init(struct net_bridge *br)
 	br->hash_max = 512;
 
 	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
-	br->multicast_querier = 0;
-	br->multicast_query_use_ifaddr = 0;
 	br->multicast_last_member_count = 2;
 	br->multicast_startup_query_count = 2;
 
@@ -1976,7 +1976,7 @@ void br_multicast_init(struct net_bridge *br)
 	br->ip6_other_query.delay_time = 0;
 	br->ip6_querier.port = NULL;
 #endif
-	br->has_ipv6_addr = 1;
+	br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
 
 	spin_lock_init(&br->multicast_lock);
 	timer_setup(&br->multicast_router_timer,
@@ -1998,7 +1998,7 @@ static void __br_multicast_open(struct net_bridge *br,
 {
 	query->startup_sent = 0;
 
-	if (br->multicast_disabled)
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		return;
 
 	mod_timer(&query->timer, jiffies);
@@ -2173,12 +2173,12 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 	int err = 0;
 
 	spin_lock_bh(&br->multicast_lock);
-	if (br->multicast_disabled == !val)
+	if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
 		goto unlock;
 
-	br_mc_disabled_update(br->dev, !val);
-	br->multicast_disabled = !val;
-	if (br->multicast_disabled)
+	br_mc_disabled_update(br->dev, val);
+	br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
+	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		goto unlock;
 
 	if (!netif_running(br->dev))
@@ -2189,7 +2189,7 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 		if (mdb->old) {
 			err = -EEXIST;
 rollback:
-			br->multicast_disabled = !!val;
+			br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
 			goto unlock;
 		}
 
@@ -2213,7 +2213,7 @@ bool br_multicast_enabled(const struct net_device *dev)
 {
 	struct net_bridge *br = netdev_priv(dev);
 
-	return !br->multicast_disabled;
+	return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
 }
 EXPORT_SYMBOL_GPL(br_multicast_enabled);
 
@@ -2236,10 +2236,10 @@ int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
 	val = !!val;
 
 	spin_lock_bh(&br->multicast_lock);
-	if (br->multicast_querier == val)
+	if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
 		goto unlock;
 
-	br->multicast_querier = val;
+	br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
 	if (!val)
 		goto unlock;
 
@@ -2560,7 +2560,7 @@ void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 	struct bridge_mcast_stats __percpu *stats;
 
 	/* if multicast_disabled is true then igmp type can't be set */
-	if (!type || !br->multicast_stats_enabled)
+	if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
 		return;
 
 	if (p)

net/bridge/br_netfilter_hooks.c

@@ -487,14 +487,15 @@ static unsigned int br_nf_pre_routing(void *priv,
 	br = p->br;
 
 	if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) {
-		if (!brnf_call_ip6tables && !br->nf_call_ip6tables)
+		if (!brnf_call_ip6tables &&
+		    !br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
 			return NF_ACCEPT;
 
 		nf_bridge_pull_encap_header_rcsum(skb);
 		return br_nf_pre_routing_ipv6(priv, skb, state);
 	}
 
-	if (!brnf_call_iptables && !br->nf_call_iptables)
+	if (!brnf_call_iptables && !br_opt_get(br, BROPT_NF_CALL_IPTABLES))
 		return NF_ACCEPT;
 
 	if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))
@@ -636,7 +637,7 @@ static unsigned int br_nf_forward_arp(void *priv,
 		return NF_ACCEPT;
 	br = p->br;
 
-	if (!brnf_call_arptables && !br->nf_call_arptables)
+	if (!brnf_call_arptables && !br_opt_get(br, BROPT_NF_CALL_ARPTABLES))
 		return NF_ACCEPT;
 
 	if (!IS_ARP(skb)) {

net/bridge/br_netlink.c

@@ -1139,7 +1139,7 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 		spin_lock_bh(&br->lock);
 		memcpy(br->group_addr, new_addr, sizeof(br->group_addr));
 		spin_unlock_bh(&br->lock);
-		br->group_addr_set = true;
+		br_opt_toggle(br, BROPT_GROUP_ADDR_SET, true);
 		br_recalculate_fwd_mask(br);
 	}
 
@@ -1167,7 +1167,7 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 		u8 val;
 
 		val = nla_get_u8(data[IFLA_BR_MCAST_QUERY_USE_IFADDR]);
-		br->multicast_query_use_ifaddr = !!val;
+		br_opt_toggle(br, BROPT_MULTICAST_QUERY_USE_IFADDR, !!val);
 	}
 
 	if (data[IFLA_BR_MCAST_QUERIER]) {
@@ -1244,7 +1244,7 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 		__u8 mcast_stats;
 
 		mcast_stats = nla_get_u8(data[IFLA_BR_MCAST_STATS_ENABLED]);
-		br->multicast_stats_enabled = !!mcast_stats;
+		br_opt_toggle(br, BROPT_MULTICAST_STATS_ENABLED, !!mcast_stats);
 	}
 
 	if (data[IFLA_BR_MCAST_IGMP_VERSION]) {
@@ -1271,19 +1271,19 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 	if (data[IFLA_BR_NF_CALL_IPTABLES]) {
 		u8 val = nla_get_u8(data[IFLA_BR_NF_CALL_IPTABLES]);
 
-		br->nf_call_iptables = val ? true : false;
+		br_opt_toggle(br, BROPT_NF_CALL_IPTABLES, !!val);
 	}
 
 	if (data[IFLA_BR_NF_CALL_IP6TABLES]) {
 		u8 val = nla_get_u8(data[IFLA_BR_NF_CALL_IP6TABLES]);
 
-		br->nf_call_ip6tables = val ? true : false;
+		br_opt_toggle(br, BROPT_NF_CALL_IP6TABLES, !!val);
 	}
 
 	if (data[IFLA_BR_NF_CALL_ARPTABLES]) {
 		u8 val = nla_get_u8(data[IFLA_BR_NF_CALL_ARPTABLES]);
 
-		br->nf_call_arptables = val ? true : false;
+		br_opt_toggle(br, BROPT_NF_CALL_ARPTABLES, !!val);
 	}
 #endif
 
@@ -1416,17 +1416,20 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 	if (nla_put_be16(skb, IFLA_BR_VLAN_PROTOCOL, br->vlan_proto) ||
 	    nla_put_u16(skb, IFLA_BR_VLAN_DEFAULT_PVID, br->default_pvid) ||
-	    nla_put_u8(skb, IFLA_BR_VLAN_STATS_ENABLED, br->vlan_stats_enabled))
+	    nla_put_u8(skb, IFLA_BR_VLAN_STATS_ENABLED,
+		       br_opt_get(br, BROPT_VLAN_STATS_ENABLED)))
 		return -EMSGSIZE;
 #endif
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	if (nla_put_u8(skb, IFLA_BR_MCAST_ROUTER, br->multicast_router) ||
-	    nla_put_u8(skb, IFLA_BR_MCAST_SNOOPING, !br->multicast_disabled) ||
+	    nla_put_u8(skb, IFLA_BR_MCAST_SNOOPING,
+		       br_opt_get(br, BROPT_MULTICAST_ENABLED)) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_QUERY_USE_IFADDR,
-		       br->multicast_query_use_ifaddr) ||
-	    nla_put_u8(skb, IFLA_BR_MCAST_QUERIER, br->multicast_querier) ||
+		       br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR)) ||
+	    nla_put_u8(skb, IFLA_BR_MCAST_QUERIER,
+		       br_opt_get(br, BROPT_MULTICAST_QUERIER)) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_STATS_ENABLED,
-		       br->multicast_stats_enabled) ||
+		       br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) ||
 	    nla_put_u32(skb, IFLA_BR_MCAST_HASH_ELASTICITY,
 			br->hash_elasticity) ||
 	    nla_put_u32(skb, IFLA_BR_MCAST_HASH_MAX, br->hash_max) ||
@@ -1469,11 +1472,11 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 	if (nla_put_u8(skb, IFLA_BR_NF_CALL_IPTABLES,
-		       br->nf_call_iptables ? 1 : 0) ||
+		       br_opt_get(br, BROPT_NF_CALL_IPTABLES) ? 1 : 0) ||
 	    nla_put_u8(skb, IFLA_BR_NF_CALL_IP6TABLES,
-		       br->nf_call_ip6tables ? 1 : 0) ||
+		       br_opt_get(br, BROPT_NF_CALL_IP6TABLES) ? 1 : 0) ||
 	    nla_put_u8(skb, IFLA_BR_NF_CALL_ARPTABLES,
-		       br->nf_call_arptables ? 1 : 0))
+		       br_opt_get(br, BROPT_NF_CALL_ARPTABLES) ? 1 : 0))
 		return -EMSGSIZE;
 #endif
 

net/bridge/br_private.h

@@ -54,14 +54,12 @@ typedef struct bridge_id bridge_id;
 typedef struct mac_addr mac_addr;
 typedef __u16 port_id;
 
-struct bridge_id
-{
+struct bridge_id {
 	unsigned char	prio[2];
 	unsigned char	addr[ETH_ALEN];
 };
 
-struct mac_addr
-{
+struct mac_addr {
 	unsigned char	addr[ETH_ALEN];
 };
 
@@ -207,8 +205,7 @@ struct net_bridge_port_group {
 	unsigned char			eth_addr[ETH_ALEN];
 };
 
-struct net_bridge_mdb_entry
-{
+struct net_bridge_mdb_entry {
 	struct hlist_node		hlist[2];
 	struct net_bridge		*br;
 	struct net_bridge_port_group __rcu *ports;
@@ -218,8 +215,7 @@ struct net_bridge_mdb_entry
 	bool				host_joined;
 };
 
-struct net_bridge_mdb_htable
-{
+struct net_bridge_mdb_htable {
 	struct hlist_head		*mhash;
 	struct rcu_head			rcu;
 	struct net_bridge_mdb_htable	*old;
@@ -310,16 +306,31 @@ static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_devi
 		rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 }
 
+enum net_bridge_opts {
+	BROPT_VLAN_ENABLED,
+	BROPT_VLAN_STATS_ENABLED,
+	BROPT_NF_CALL_IPTABLES,
+	BROPT_NF_CALL_IP6TABLES,
+	BROPT_NF_CALL_ARPTABLES,
+	BROPT_GROUP_ADDR_SET,
+	BROPT_MULTICAST_ENABLED,
+	BROPT_MULTICAST_QUERIER,
+	BROPT_MULTICAST_QUERY_USE_IFADDR,
+	BROPT_MULTICAST_STATS_ENABLED,
+	BROPT_HAS_IPV6_ADDR,
+	BROPT_NEIGH_SUPPRESS_ENABLED,
+	BROPT_MTU_SET_BY_USER,
+};
+
 struct net_bridge {
 	spinlock_t			lock;
 	spinlock_t			hash_lock;
 	struct list_head		port_list;
 	struct net_device		*dev;
 	struct pcpu_sw_netstats		__percpu *stats;
+	unsigned long			options;
 	/* These fields are accessed on each packet */
 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
-	u8				vlan_enabled;
-	u8				vlan_stats_enabled;
 	__be16				vlan_proto;
 	u16				default_pvid;
 	struct net_bridge_vlan_group	__rcu *vlgrp;
@@ -331,9 +342,6 @@ struct net_bridge {
 		struct rtable		fake_rtable;
 		struct rt6_info		fake_rt6_info;
 	};
-	bool				nf_call_iptables;
-	bool				nf_call_ip6tables;
-	bool				nf_call_arptables;
 #endif
 	u16				group_fwd_mask;
 	u16				group_fwd_mask_required;
@@ -341,7 +349,6 @@ struct net_bridge {
 	/* STP */
 	bridge_id			designated_root;
 	bridge_id			bridge_id;
-	u32				root_path_cost;
 	unsigned char			topology_change;
 	unsigned char			topology_change_detected;
 	u16				root_port;
@@ -353,9 +360,9 @@ struct net_bridge {
 	unsigned long			bridge_hello_time;
 	unsigned long			bridge_forward_delay;
 	unsigned long			bridge_ageing_time;
+	u32				root_path_cost;
 
 	u8				group_addr[ETH_ALEN];
-	bool				group_addr_set;
 
 	enum {
 		BR_NO_STP, 		/* no spanning tree */
@@ -364,13 +371,6 @@ struct net_bridge {
 	} stp_enabled;
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
-	unsigned char			multicast_router;
-
-	u8				multicast_disabled:1;
-	u8				multicast_querier:1;
-	u8				multicast_query_use_ifaddr:1;
-	u8				has_ipv6_addr:1;
-	u8				multicast_stats_enabled:1;
 
 	u32				hash_elasticity;
 	u32				hash_max;
@@ -379,7 +379,11 @@ struct net_bridge {
 	u32				multicast_startup_query_count;
 
 	u8				multicast_igmp_version;
-
+	u8				multicast_router;
+#if IS_ENABLED(CONFIG_IPV6)
+	u8				multicast_mld_version;
+#endif
+	spinlock_t			multicast_lock;
 	unsigned long			multicast_last_member_interval;
 	unsigned long			multicast_membership_interval;
 	unsigned long			multicast_querier_interval;
@@ -387,7 +391,6 @@ struct net_bridge {
 	unsigned long			multicast_query_response_interval;
 	unsigned long			multicast_startup_query_interval;
 
-	spinlock_t			multicast_lock;
 	struct net_bridge_mdb_htable __rcu *mdb;
 	struct hlist_head		router_list;
 
@@ -400,7 +403,6 @@ struct net_bridge {
 	struct bridge_mcast_other_query	ip6_other_query;
 	struct bridge_mcast_own_query	ip6_own_query;
 	struct bridge_mcast_querier	ip6_querier;
-	u8				multicast_mld_version;
 #endif /* IS_ENABLED(CONFIG_IPV6) */
 #endif
 
@@ -414,8 +416,6 @@ struct net_bridge {
 #ifdef CONFIG_NET_SWITCHDEV
 	int offload_fwd_mark;
 #endif
-	bool				neigh_suppress_enabled;
-	bool				mtu_set_by_user;
 	struct hlist_head		fdb_list;
 };
 
@@ -493,6 +493,14 @@ static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 	return true;
 }
 
+static inline int br_opt_get(const struct net_bridge *br,
+			     enum net_bridge_opts opt)
+{
+	return test_bit(opt, &br->options);
+}
+
+void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
+
 /* br_device.c */
 void br_dev_setup(struct net_device *dev);
 void br_dev_delete(struct net_device *dev, struct list_head *list);
@@ -699,8 +707,8 @@ __br_multicast_querier_exists(struct net_bridge *br,
 {
 	bool own_querier_enabled;
 
-	if (br->multicast_querier) {
-		if (is_ipv6 && !br->has_ipv6_addr)
+	if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
+		if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
 			own_querier_enabled = false;
 		else
 			own_querier_enabled = true;

net/bridge/br_sysfs_br.c

@@ -303,7 +303,7 @@ static ssize_t group_addr_store(struct device *d,
 	ether_addr_copy(br->group_addr, new_addr);
 	spin_unlock_bh(&br->lock);
 
-	br->group_addr_set = true;
+	br_opt_toggle(br, BROPT_GROUP_ADDR_SET, true);
 	br_recalculate_fwd_mask(br);
 	netdev_state_change(br->dev);
 
@@ -349,7 +349,7 @@ static ssize_t multicast_snooping_show(struct device *d,
 				       char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%d\n", !br->multicast_disabled);
+	return sprintf(buf, "%d\n", br_opt_get(br, BROPT_MULTICAST_ENABLED));
 }
 
 static ssize_t multicast_snooping_store(struct device *d,
@@ -365,12 +365,13 @@ static ssize_t multicast_query_use_ifaddr_show(struct device *d,
 					       char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%d\n", br->multicast_query_use_ifaddr);
+	return sprintf(buf, "%d\n",
+		       br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR));
 }
 
 static int set_query_use_ifaddr(struct net_bridge *br, unsigned long val)
 {
-	br->multicast_query_use_ifaddr = !!val;
+	br_opt_toggle(br, BROPT_MULTICAST_QUERY_USE_IFADDR, !!val);
 	return 0;
 }
 
@@ -388,7 +389,7 @@ static ssize_t multicast_querier_show(struct device *d,
 				      char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%d\n", br->multicast_querier);
+	return sprintf(buf, "%d\n", br_opt_get(br, BROPT_MULTICAST_QUERIER));
 }
 
 static ssize_t multicast_querier_store(struct device *d,
@@ -636,12 +637,13 @@ static ssize_t multicast_stats_enabled_show(struct device *d,
 {
 	struct net_bridge *br = to_bridge(d);
 
-	return sprintf(buf, "%u\n", br->multicast_stats_enabled);
+	return sprintf(buf, "%d\n",
+		       br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED));
 }
 
 static int set_stats_enabled(struct net_bridge *br, unsigned long val)
 {
-	br->multicast_stats_enabled = !!val;
+	br_opt_toggle(br, BROPT_MULTICAST_STATS_ENABLED, !!val);
 	return 0;
 }
 
@@ -678,12 +680,12 @@ static ssize_t nf_call_iptables_show(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%u\n", br->nf_call_iptables);
+	return sprintf(buf, "%u\n", br_opt_get(br, BROPT_NF_CALL_IPTABLES));
 }
 
 static int set_nf_call_iptables(struct net_bridge *br, unsigned long val)
 {
-	br->nf_call_iptables = val ? true : false;
+	br_opt_toggle(br, BROPT_NF_CALL_IPTABLES, !!val);
 	return 0;
 }
 
@@ -699,12 +701,12 @@ static ssize_t nf_call_ip6tables_show(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%u\n", br->nf_call_ip6tables);
+	return sprintf(buf, "%u\n", br_opt_get(br, BROPT_NF_CALL_IP6TABLES));
 }
 
 static int set_nf_call_ip6tables(struct net_bridge *br, unsigned long val)
 {
-	br->nf_call_ip6tables = val ? true : false;
+	br_opt_toggle(br, BROPT_NF_CALL_IP6TABLES, !!val);
 	return 0;
 }
 
@@ -720,12 +722,12 @@ static ssize_t nf_call_arptables_show(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%u\n", br->nf_call_arptables);
+	return sprintf(buf, "%u\n", br_opt_get(br, BROPT_NF_CALL_ARPTABLES));
 }
 
 static int set_nf_call_arptables(struct net_bridge *br, unsigned long val)
 {
-	br->nf_call_arptables = val ? true : false;
+	br_opt_toggle(br, BROPT_NF_CALL_ARPTABLES, !!val);
 	return 0;
 }
 
@@ -743,7 +745,7 @@ static ssize_t vlan_filtering_show(struct device *d,
 				   char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%d\n", br->vlan_enabled);
+	return sprintf(buf, "%d\n", br_opt_get(br, BROPT_VLAN_ENABLED));
 }
 
 static ssize_t vlan_filtering_store(struct device *d,
@@ -791,7 +793,7 @@ static ssize_t vlan_stats_enabled_show(struct device *d,
 				       char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%u\n", br->vlan_stats_enabled);
+	return sprintf(buf, "%u\n", br_opt_get(br, BROPT_VLAN_STATS_ENABLED));
 }
 
 static ssize_t vlan_stats_enabled_store(struct device *d,

net/bridge/br_vlan.c

@@ -386,7 +386,7 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br,
 			return NULL;
 		}
 	}
-	if (br->vlan_stats_enabled) {
+	if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 		stats = this_cpu_ptr(v->stats);
 		u64_stats_update_begin(&stats->syncp);
 		stats->tx_bytes += skb->len;
@@ -475,14 +475,14 @@ static bool __allowed_ingress(const struct net_bridge *br,
 			skb->vlan_tci |= pvid;
 
 		/* if stats are disabled we can avoid the lookup */
-		if (!br->vlan_stats_enabled)
+		if (!br_opt_get(br, BROPT_VLAN_STATS_ENABLED))
 			return true;
 	}
 	v = br_vlan_find(vg, *vid);
 	if (!v || !br_vlan_should_use(v))
 		goto drop;
 
-	if (br->vlan_stats_enabled) {
+	if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 		stats = this_cpu_ptr(v->stats);
 		u64_stats_update_begin(&stats->syncp);
 		stats->rx_bytes += skb->len;
@@ -504,7 +504,7 @@ bool br_allowed_ingress(const struct net_bridge *br,
 	/* If VLAN filtering is disabled on the bridge, all packets are
 	 * permitted.
 	 */
-	if (!br->vlan_enabled) {
+	if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 		BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 		return true;
 	}
@@ -538,7 +538,7 @@ bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 	struct net_bridge *br = p->br;
 
 	/* If filtering was disabled at input, let it pass. */
-	if (!br->vlan_enabled)
+	if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 		return true;
 
 	vg = nbp_vlan_group_rcu(p);
@@ -695,11 +695,12 @@ struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 /* Must be protected by RTNL. */
 static void recalculate_group_addr(struct net_bridge *br)
 {
-	if (br->group_addr_set)
+	if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 		return;
 
 	spin_lock_bh(&br->lock);
-	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
+	if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
+	    br->vlan_proto == htons(ETH_P_8021Q)) {
 		/* Bridge Group Address */
 		br->group_addr[5] = 0x00;
 	} else { /* vlan_enabled && ETH_P_8021AD */
@@ -712,7 +713,8 @@ static void recalculate_group_addr(struct net_bridge *br)
 /* Must be protected by RTNL. */
 void br_recalculate_fwd_mask(struct net_bridge *br)
 {
-	if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
+	if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
+	    br->vlan_proto == htons(ETH_P_8021Q))
 		br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 	else /* vlan_enabled && ETH_P_8021AD */
 		br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
@@ -729,14 +731,14 @@ int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 	};
 	int err;
 
-	if (br->vlan_enabled == val)
+	if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 		return 0;
 
 	err = switchdev_port_attr_set(br->dev, &attr);
 	if (err && err != -EOPNOTSUPP)
 		return err;
 
-	br->vlan_enabled = val;
+	br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 	br_manage_promisc(br);
 	recalculate_group_addr(br);
 	br_recalculate_fwd_mask(br);
@@ -753,7 +755,7 @@ bool br_vlan_enabled(const struct net_device *dev)
 {
 	struct net_bridge *br = netdev_priv(dev);
 
-	return !!br->vlan_enabled;
+	return br_opt_get(br, BROPT_VLAN_ENABLED);
 }
 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 
@@ -819,7 +821,7 @@ int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 	switch (val) {
 	case 0:
 	case 1:
-		br->vlan_stats_enabled = val;
+		br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 		break;
 	default:
 		return -EINVAL;
@@ -964,7 +966,7 @@ int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 		goto out;
 
 	/* Only allow default pvid change when filtering is disabled */
-	if (br->vlan_enabled) {
+	if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
 		pr_info_once("Please disable vlan filtering to change default_pvid\n");
 		err = -EPERM;
 		goto out;
@@ -1018,7 +1020,7 @@ int nbp_vlan_init(struct net_bridge_port *p)
 		.orig_dev = p->br->dev,
 		.id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 		.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
-		.u.vlan_filtering = p->br->vlan_enabled,
+		.u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
 	};
 	struct net_bridge_vlan_group *vg;
 	int ret = -ENOMEM;