From 3b793e498a8e380d6bcf6951758cba5c10af10b0 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Wed, 26 Sep 2018 17:01:00 +0300 Subject: [PATCH] net: bridge: add bitfield for options and convert vlan opts Bridge options have usually been added as separate fields all over the net_bridge struct taking up space and ending up in different cache lines. Let's move them to a single bitfield to save up space and speedup lookups. This patch adds a simple API for option modifying and retrieving using bitops and converts the first user of the API - the bridge vlan options (vlan_enabled and vlan_stats_enabled). Signed-off-by: Nikolay Aleksandrov Reviewed-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br.c | 16 ++++++++++++++++ net/bridge/br_netlink.c | 3 ++- net/bridge/br_private.h | 16 ++++++++++++++-- net/bridge/br_sysfs_br.c | 4 ++-- net/bridge/br_vlan.c | 28 +++++++++++++++------------- 5 files changed, 49 insertions(+), 18 deletions(-) diff --git a/net/bridge/br.c b/net/bridge/br.c index b0a0b82e2d910..e411e40333e2e 100644 --- a/net/bridge/br.c +++ b/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; diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index ec2b58a09f763..6a53caff2d317 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -1416,7 +1416,8 @@ 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 diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 522d707cc5332..0abb632283ff5 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -306,16 +306,20 @@ 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, +}; + 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; @@ -489,6 +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); diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c index 0318a69888d48..9f1f3866c8334 100644 --- a/net/bridge/br_sysfs_br.c +++ b/net/bridge/br_sysfs_br.c @@ -743,7 +743,7 @@ 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 +791,7 @@ 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, diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index bb6ba794864f9..61d698bfe2b79 100644 --- a/net/bridge/br_vlan.c +++ b/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); @@ -699,7 +699,8 @@ static void recalculate_group_addr(struct net_bridge *br) 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; -- 2.39.5