[SRU][B][PATCH 1/5] net: bridge: add bitfield for options and convert vlan opts
Connor Kuehl
connor.kuehl at canonical.com
Fri Jul 26 00:20:47 UTC 2019
From: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
BugLink: https://bugs.launchpad.net/bugs/1836910
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 <nikolay at cumulusnetworks.com>
Reviewed-by: Stephen Hemminger <stephen at networkplumber.org>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit ae75767ec206c6f445973e5e6c5af8a865016e15)
Signed-off-by: Connor Kuehl <connor.kuehl at canonical.com>
---
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 6bf06e756df2..ee05f91baf0d 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -171,6 +171,22 @@ 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 015f465c514b..cdc298e3ab9f 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1381,7 +1381,8 @@ 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 14224384e4d5..bfd6541de1dc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -302,16 +302,20 @@ 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;
@@ -482,6 +486,14 @@ 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 723f25eed8ea..8912c7c645ed 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -750,7 +750,7 @@ 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,
@@ -798,7 +798,7 @@ 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 9896f4975353..7466e0273435 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -388,7 +388,7 @@ 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;
@@ -477,14 +477,14 @@ 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;
@@ -506,7 +506,7 @@ 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;
}
@@ -540,7 +540,7 @@ 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);
@@ -679,7 +679,8 @@ 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 */
@@ -692,7 +693,8 @@ 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 &
@@ -709,14 +711,14 @@ 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);
@@ -733,7 +735,7 @@ 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);
@@ -799,7 +801,7 @@ 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;
@@ -945,7 +947,7 @@ 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;
@@ -999,7 +1001,7 @@ 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;
--
2.20.1
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