Commit 6dada9b1 authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by David S. Miller
Browse files

bridge: vlan: learn to count 



Add support for per-VLAN Tx/Rx statistics. Every global vlan context gets
allocated a per-cpu stats which is then set in each per-port vlan context
for quick access. The br_allowed_ingress() common function is used to
account for Rx packets and the br_handle_vlan() common function is used
to account for Tx packets. Stats accounting is performed only if the
bridge-wide vlan_stats_enabled option is set either via sysfs or netlink.
A struct hole between vlan_enabled and vlan_proto is used for the new
option so it is in the same cache line. Currently it is binary (on/off)
but it is intentionally restricted to exactly 0 and 1 since other values
will be used in the future for different purposes (e.g. per-port stats).

Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 97a47fac

include/uapi/linux/if_link.h

+1 −0
Original line number Diff line number Diff line
@@ -272,6 +272,7 @@ enum { 
	IFLA_BR_NF_CALL_ARPTABLES,

	IFLA_BR_VLAN_DEFAULT_PVID,

	IFLA_BR_PAD,

	IFLA_BR_VLAN_STATS_ENABLED,

	__IFLA_BR_MAX,

};

net/bridge/br_netlink.c

+12 −1
Original line number Diff line number Diff line
@@ -850,6 +850,7 @@ static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = { 
	[IFLA_BR_NF_CALL_IP6TABLES] = { .type = NLA_U8 },

	[IFLA_BR_NF_CALL_ARPTABLES] = { .type = NLA_U8 },

	[IFLA_BR_VLAN_DEFAULT_PVID] = { .type = NLA_U16 },

	[IFLA_BR_VLAN_STATS_ENABLED] = { .type = NLA_U8 },

};



static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
@@ -921,6 +922,14 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[], 
		if (err)

			return err;

	}



	if (data[IFLA_BR_VLAN_STATS_ENABLED]) {

		__u8 vlan_stats = nla_get_u8(data[IFLA_BR_VLAN_STATS_ENABLED]);



		err = br_vlan_set_stats(br, vlan_stats);

		if (err)

			return err;

	}

#endif



	if (data[IFLA_BR_GROUP_FWD_MASK]) {
@@ -1082,6 +1091,7 @@ static size_t br_get_size(const struct net_device *brdev) 
#ifdef CONFIG_BRIDGE_VLAN_FILTERING

	       nla_total_size(sizeof(__be16)) +	/* IFLA_BR_VLAN_PROTOCOL */

	       nla_total_size(sizeof(u16)) +    /* IFLA_BR_VLAN_DEFAULT_PVID */

	       nla_total_size(sizeof(u8)) +     /* IFLA_BR_VLAN_STATS_ENABLED */

#endif

	       nla_total_size(sizeof(u16)) +    /* IFLA_BR_GROUP_FWD_MASK */

	       nla_total_size(sizeof(struct ifla_bridge_id)) +   /* IFLA_BR_ROOT_ID */
@@ -1167,7 +1177,8 @@ 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_u16(skb, IFLA_BR_VLAN_DEFAULT_PVID, br->default_pvid) ||

	    nla_put_u8(skb, IFLA_BR_VLAN_STATS_ENABLED, br->vlan_stats_enabled))

		return -EMSGSIZE;

#endif

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING

net/bridge/br_private.h

+12 −1
Original line number Diff line number Diff line
@@ -77,12 +77,21 @@ struct bridge_mcast_querier { 
};

#endif



struct br_vlan_stats {

	u64 rx_bytes;

	u64 rx_packets;

	u64 tx_bytes;

	u64 tx_packets;

	struct u64_stats_sync syncp;

};



/**

 * struct net_bridge_vlan - per-vlan entry

 *

 * @vnode: rhashtable member

 * @vid: VLAN id

 * @flags: bridge vlan flags

 * @stats: per-cpu VLAN statistics

 * @br: if MASTER flag set, this points to a bridge struct

 * @port: if MASTER flag unset, this points to a port struct

 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
@@ -100,6 +109,7 @@ struct net_bridge_vlan { 
	struct rhash_head		vnode;

	u16				vid;

	u16				flags;

	struct br_vlan_stats __percpu	*stats;

	union {

		struct net_bridge	*br;

		struct net_bridge_port	*port;
@@ -342,6 +352,7 @@ struct net_bridge 
#ifdef CONFIG_BRIDGE_VLAN_FILTERING

	struct net_bridge_vlan_group	__rcu *vlgrp;

	u8				vlan_enabled;

	u8				vlan_stats_enabled;

	__be16				vlan_proto;

	u16				default_pvid;

#endif
@@ -691,6 +702,7 @@ int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 
int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);

int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);

int br_vlan_set_proto(struct net_bridge *br, unsigned long val);

int br_vlan_set_stats(struct net_bridge *br, unsigned long val);

int br_vlan_init(struct net_bridge *br);

int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);

int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
@@ -880,7 +892,6 @@ static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 
{

	return NULL;

}



#endif



struct nf_br_ops {

net/bridge/br_sysfs_br.c

+17 −0
Original line number Diff line number Diff line
@@ -731,6 +731,22 @@ static ssize_t default_pvid_store(struct device *d, 
	return store_bridge_parm(d, buf, len, br_vlan_set_default_pvid);

}

static DEVICE_ATTR_RW(default_pvid);



static ssize_t vlan_stats_enabled_show(struct device *d,

				       struct device_attribute *attr,

				       char *buf)

{

	struct net_bridge *br = to_bridge(d);

	return sprintf(buf, "%u\n", br->vlan_stats_enabled);

}



static ssize_t vlan_stats_enabled_store(struct device *d,

					struct device_attribute *attr,

					const char *buf, size_t len)

{

	return store_bridge_parm(d, buf, len, br_vlan_set_stats);

}

static DEVICE_ATTR_RW(vlan_stats_enabled);

#endif



static struct attribute *bridge_attrs[] = {
@@ -778,6 +794,7 @@ static struct attribute *bridge_attrs[] = { 
	&dev_attr_vlan_filtering.attr,

	&dev_attr_vlan_protocol.attr,

	&dev_attr_default_pvid.attr,

	&dev_attr_vlan_stats_enabled.attr,

#endif

	NULL

};

net/bridge/br_vlan.c

+68 −14
Original line number Diff line number Diff line
@@ -162,6 +162,17 @@ static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid 
	return masterv;

}



static void br_master_vlan_rcu_free(struct rcu_head *rcu)

{

	struct net_bridge_vlan *v;



	v = container_of(rcu, struct net_bridge_vlan, rcu);

	WARN_ON(!br_vlan_is_master(v));

	free_percpu(v->stats);

	v->stats = NULL;

	kfree(v);

}



static void br_vlan_put_master(struct net_bridge_vlan *masterv)

{

	struct net_bridge_vlan_group *vg;
@@ -174,7 +185,7 @@ static void br_vlan_put_master(struct net_bridge_vlan *masterv) 
		rhashtable_remove_fast(&vg->vlan_hash,

				       &masterv->vnode, br_vlan_rht_params);

		__vlan_del_list(masterv);

		kfree_rcu(masterv, rcu);

		call_rcu(&masterv->rcu, br_master_vlan_rcu_free);

	}

}
@@ -230,6 +241,7 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags) 
		if (!masterv)

			goto out_filt;

		v->brvlan = masterv;

		v->stats = masterv->stats;

	}



	/* Add the dev mac and count the vlan only if it's usable */
@@ -329,6 +341,7 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br, 
			       struct net_bridge_vlan_group *vg,

			       struct sk_buff *skb)

{

	struct br_vlan_stats *stats;

	struct net_bridge_vlan *v;

	u16 vid;
@@ -355,18 +368,27 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br, 
			return NULL;

		}

	}

	if (br->vlan_stats_enabled) {

		stats = this_cpu_ptr(v->stats);

		u64_stats_update_begin(&stats->syncp);

		stats->tx_bytes += skb->len;

		stats->tx_packets++;

		u64_stats_update_end(&stats->syncp);

	}



	if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)

		skb->vlan_tci = 0;



out:

	return skb;

}



/* Called under RCU */

static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto,

static bool __allowed_ingress(const struct net_bridge *br,

			      struct net_bridge_vlan_group *vg,

			      struct sk_buff *skb, u16 *vid)

{

	const struct net_bridge_vlan *v;

	struct br_vlan_stats *stats;

	struct net_bridge_vlan *v;

	bool tagged;



	BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
@@ -375,7 +397,7 @@ static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto, 
	 * HW accelerated vlan tag.

	 */

	if (unlikely(!skb_vlan_tag_present(skb) &&

		     skb->protocol == proto)) {

		     skb->protocol == br->vlan_proto)) {

		skb = skb_vlan_untag(skb);

		if (unlikely(!skb))

			return false;
@@ -383,7 +405,7 @@ static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto, 


	if (!br_vlan_get_tag(skb, vid)) {

		/* Tagged frame */

		if (skb->vlan_proto != proto) {

		if (skb->vlan_proto != br->vlan_proto) {

			/* Protocol-mismatch, empty out vlan_tci for new tag */

			skb_push(skb, ETH_HLEN);

			skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
@@ -419,7 +441,7 @@ static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto, 
		*vid = pvid;

		if (likely(!tagged))

			/* Untagged Frame. */

			__vlan_hwaccel_put_tag(skb, proto, pvid);

			__vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);

		else

			/* Priority-tagged Frame.

			 * At this point, We know that skb->vlan_tci had
@@ -428,13 +450,24 @@ static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto, 
			 */

			skb->vlan_tci |= pvid;



		/* if stats are disabled we can avoid the lookup */

		if (!br->vlan_stats_enabled)

			return true;

	}



	/* Frame had a valid vlan tag.  See if vlan is allowed */

	v = br_vlan_find(vg, *vid);

	if (v && br_vlan_should_use(v))

	if (!v || !br_vlan_should_use(v))

		goto drop;



	if (br->vlan_stats_enabled) {

		stats = this_cpu_ptr(v->stats);

		u64_stats_update_begin(&stats->syncp);

		stats->rx_bytes += skb->len;

		stats->rx_packets++;

		u64_stats_update_end(&stats->syncp);

	}



	return true;



drop:

	kfree_skb(skb);

	return false;
@@ -452,7 +485,7 @@ bool br_allowed_ingress(const struct net_bridge *br, 
		return true;

	}



	return __allowed_ingress(vg, br->vlan_proto, skb, vid);

	return __allowed_ingress(br, vg, skb, vid);

}



/* Called under RCU. */
@@ -542,6 +575,11 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 
	if (!vlan)

		return -ENOMEM;



	vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);

	if (!vlan->stats) {

		kfree(vlan);

		return -ENOMEM;

	}

	vlan->vid = vid;

	vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;

	vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
@@ -549,8 +587,10 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 
	if (flags & BRIDGE_VLAN_INFO_BRENTRY)

		atomic_set(&vlan->refcnt, 1);

	ret = __vlan_add(vlan, flags);

	if (ret)

	if (ret) {

		free_percpu(vlan->stats);

		kfree(vlan);

	}



	return ret;

}
@@ -711,6 +751,20 @@ int br_vlan_set_proto(struct net_bridge *br, unsigned long val) 
	return __br_vlan_set_proto(br, htons(val));

}



int br_vlan_set_stats(struct net_bridge *br, unsigned long val)

{

	switch (val) {

	case 0:

	case 1:

		br->vlan_stats_enabled = val;

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)

{

	struct net_bridge_vlan *v;

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