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Message-Id: <20191209230522.1255467-1-vivien.didelot@gmail.com>
Date: Mon, 9 Dec 2019 18:05:21 -0500
From: Vivien Didelot <vivien.didelot@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Roopa Prabhu <roopa@...ulusnetworks.com>,
Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
Stephen Hemminger <stephen@...workplumber.org>,
Vivien Didelot <vivien.didelot@...il.com>
Subject: [PATCH net-next] net: bridge: add STP xstats
This adds rx_bpdu, tx_bpdu, rx_tcn, tx_tcn, transition_blk,
transition_fwd xstats counters to the bridge ports copied over via
netlink, providing useful information for STP.
Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
include/uapi/linux/if_bridge.h | 10 ++++++++++
net/bridge/br_if.c | 8 ++++++++
net/bridge/br_netlink.c | 9 +++++++++
net/bridge/br_private.h | 9 +++++++++
net/bridge/br_stp.c | 25 +++++++++++++++++++++++++
net/bridge/br_stp_bpdu.c | 12 ++++++++++++
net/bridge/br_stp_if.c | 27 +++++++++++++++++++++++++++
7 files changed, 100 insertions(+)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 1b3c2b643a02..e7f2bb782006 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -156,6 +156,15 @@ struct bridge_vlan_xstats {
__u32 pad2;
};
+struct bridge_stp_xstats {
+ __u64 transition_blk;
+ __u64 transition_fwd;
+ __u64 rx_bpdu;
+ __u64 tx_bpdu;
+ __u64 rx_tcn;
+ __u64 tx_tcn;
+};
+
/* Bridge multicast database attributes
* [MDBA_MDB] = {
* [MDBA_MDB_ENTRY] = {
@@ -261,6 +270,7 @@ enum {
BRIDGE_XSTATS_UNSPEC,
BRIDGE_XSTATS_VLAN,
BRIDGE_XSTATS_MCAST,
+ BRIDGE_XSTATS_STP,
BRIDGE_XSTATS_PAD,
__BRIDGE_XSTATS_MAX
};
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 4fe30b182ee7..3eb214ef9763 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -250,6 +250,7 @@ static void release_nbp(struct kobject *kobj)
{
struct net_bridge_port *p
= container_of(kobj, struct net_bridge_port, kobj);
+ free_percpu(p->stp_stats);
kfree(p);
}
@@ -419,6 +420,12 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
if (p == NULL)
return ERR_PTR(-ENOMEM);
+ p->stp_stats = netdev_alloc_pcpu_stats(struct br_stp_stats);
+ if (!p->stp_stats) {
+ kfree(p);
+ return ERR_PTR(-ENOMEM);
+ }
+
p->br = br;
dev_hold(dev);
p->dev = dev;
@@ -432,6 +439,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
err = br_multicast_add_port(p);
if (err) {
dev_put(dev);
+ free_percpu(p->stp_stats);
kfree(p);
p = ERR_PTR(err);
}
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index a0a54482aabc..03aced1f862b 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1597,6 +1597,15 @@ static int br_fill_linkxstats(struct sk_buff *skb,
}
}
+ if (p) {
+ struct bridge_stp_xstats xstats;
+
+ br_stp_get_xstats(p, &xstats);
+
+ if (nla_put(skb, BRIDGE_XSTATS_STP, sizeof(xstats), &xstats))
+ goto nla_put_failure;
+ }
+
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
if (++vl_idx >= *prividx) {
nla = nla_reserve_64bit(skb, BRIDGE_XSTATS_MCAST,
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 36b0367ca1e0..af5f28f0f2ef 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -95,6 +95,11 @@ struct br_vlan_stats {
struct u64_stats_sync syncp;
};
+struct br_stp_stats {
+ struct bridge_stp_xstats xstats;
+ struct u64_stats_sync syncp;
+};
+
struct br_tunnel_info {
__be64 tunnel_id;
struct metadata_dst *tunnel_dst;
@@ -283,6 +288,8 @@ struct net_bridge_port {
#endif
u16 group_fwd_mask;
u16 backup_redirected_cnt;
+
+ struct br_stp_stats __percpu *stp_stats;
};
#define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
@@ -1146,6 +1153,8 @@ void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
+void br_stp_get_xstats(const struct net_bridge_port *p,
+ struct bridge_stp_xstats *xstats);
ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
/* br_stp_bpdu.c */
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 1f1410f8d312..8bcdab29442d 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -45,6 +45,18 @@ void br_set_state(struct net_bridge_port *p, unsigned int state)
br_info(p->br, "port %u(%s) entered %s state\n",
(unsigned int) p->port_no, p->dev->name,
br_port_state_names[p->state]);
+
+ if (p->br->stp_enabled == BR_KERNEL_STP) {
+ struct br_stp_stats *stats;
+
+ stats = this_cpu_ptr(p->stp_stats);
+ u64_stats_update_begin(&stats->syncp);
+ if (p->state == BR_STATE_BLOCKING)
+ stats->xstats.transition_blk++;
+ else if (p->state == BR_STATE_FORWARDING)
+ stats->xstats.transition_fwd++;
+ u64_stats_update_end(&stats->syncp);
+ }
}
/* called under bridge lock */
@@ -481,9 +493,15 @@ static void br_topology_change_acknowledge(struct net_bridge_port *p)
void br_received_config_bpdu(struct net_bridge_port *p,
const struct br_config_bpdu *bpdu)
{
+ struct br_stp_stats *stats;
struct net_bridge *br;
int was_root;
+ stats = this_cpu_ptr(p->stp_stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->xstats.rx_bpdu++;
+ u64_stats_update_end(&stats->syncp);
+
br = p->br;
was_root = br_is_root_bridge(br);
@@ -517,6 +535,13 @@ void br_received_config_bpdu(struct net_bridge_port *p,
/* called under bridge lock */
void br_received_tcn_bpdu(struct net_bridge_port *p)
{
+ struct br_stp_stats *stats;
+
+ stats = this_cpu_ptr(p->stp_stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->xstats.rx_tcn++;
+ u64_stats_update_end(&stats->syncp);
+
if (br_is_designated_port(p)) {
br_info(p->br, "port %u(%s) received tcn bpdu\n",
(unsigned int) p->port_no, p->dev->name);
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 7796dd9d42d7..2dbd11e21f2a 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -78,6 +78,7 @@ static inline int br_get_ticks(const unsigned char *src)
/* called under bridge lock */
void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
{
+ struct br_stp_stats *stats;
unsigned char buf[35];
if (p->br->stp_enabled != BR_KERNEL_STP)
@@ -118,11 +119,17 @@ void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
br_set_ticks(buf+33, bpdu->forward_delay);
br_send_bpdu(p, buf, 35);
+
+ stats = this_cpu_ptr(p->stp_stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->xstats.tx_bpdu++;
+ u64_stats_update_end(&stats->syncp);
}
/* called under bridge lock */
void br_send_tcn_bpdu(struct net_bridge_port *p)
{
+ struct br_stp_stats *stats;
unsigned char buf[4];
if (p->br->stp_enabled != BR_KERNEL_STP)
@@ -133,6 +140,11 @@ void br_send_tcn_bpdu(struct net_bridge_port *p)
buf[2] = 0;
buf[3] = BPDU_TYPE_TCN;
br_send_bpdu(p, buf, 4);
+
+ stats = this_cpu_ptr(p->stp_stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->xstats.tx_tcn++;
+ u64_stats_update_end(&stats->syncp);
}
/*
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index d174d3a566aa..cbce7d0e40b9 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -333,6 +333,33 @@ int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
return 0;
}
+void br_stp_get_xstats(const struct net_bridge_port *p,
+ struct bridge_stp_xstats *xstats)
+{
+ int i;
+
+ memset(xstats, 0, sizeof(*xstats));
+
+ for_each_possible_cpu(i) {
+ struct bridge_stp_xstats cpu_xstats;
+ struct br_stp_stats *stats;
+ unsigned int start;
+
+ stats = per_cpu_ptr(p->stp_stats, i);
+ do {
+ start = u64_stats_fetch_begin_irq(&stats->syncp);
+ memcpy(&cpu_xstats, &stats->xstats, sizeof(cpu_xstats));
+ } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+
+ xstats->transition_blk += cpu_xstats.transition_blk;
+ xstats->transition_fwd += cpu_xstats.transition_fwd;
+ xstats->rx_bpdu += cpu_xstats.rx_bpdu;
+ xstats->tx_bpdu += cpu_xstats.tx_bpdu;
+ xstats->rx_tcn += cpu_xstats.rx_tcn;
+ xstats->tx_tcn += cpu_xstats.tx_tcn;
+ }
+}
+
ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
{
return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
--
2.24.0
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