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Date: Fri, 22 Nov 2019 18:07:42 -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>,
bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
f.fainelli@...il.com, Vivien Didelot <vivien.didelot@...il.com>
Subject: [PATCH net-next] net: bridge: add STP stat counters
This adds rx_bpdu, tx_bpdu, rx_tcn, tx_tcn, transition_blk,
transition_fwd stat counters to the bridge ports, along with sysfs
statistics nodes under a "statistics" directory of the "brport" entry,
providing useful information for STP, for example:
# cat /sys/class/net/lan0/brport/statistics/tx_bpdu
26
# cat /sys/class/net/lan5/brport/statistics/transition_fwd
3
At the same time, make BRPORT_ATTR define a non-const attribute as
this is required by the attribute group structure.
Signed-off-by: Vivien Didelot <vivien.didelot@...il.com>
---
net/bridge/br_private.h | 8 ++++++++
net/bridge/br_stp.c | 8 ++++++++
net/bridge/br_stp_bpdu.c | 4 ++++
net/bridge/br_sysfs_if.c | 35 ++++++++++++++++++++++++++++++++++-
4 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 36b0367ca1e0..360d8030e3b2 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -283,6 +283,14 @@ struct net_bridge_port {
#endif
u16 group_fwd_mask;
u16 backup_redirected_cnt;
+
+ /* Statistics */
+ atomic_long_t rx_bpdu;
+ atomic_long_t tx_bpdu;
+ atomic_long_t rx_tcn;
+ atomic_long_t tx_tcn;
+ atomic_long_t transition_blk;
+ atomic_long_t transition_fwd;
};
#define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 1f1410f8d312..63568ee2a9cd 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -403,6 +403,8 @@ static void br_make_blocking(struct net_bridge_port *p)
del_timer(&p->forward_delay_timer);
}
+
+ atomic_long_inc(&p->transition_blk);
}
/* called under bridge lock */
@@ -426,6 +428,8 @@ static void br_make_forwarding(struct net_bridge_port *p)
if (br->forward_delay != 0)
mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
+
+ atomic_long_inc(&p->transition_fwd);
}
/* called under bridge lock */
@@ -512,6 +516,8 @@ void br_received_config_bpdu(struct net_bridge_port *p,
} else if (br_is_designated_port(p)) {
br_reply(p);
}
+
+ atomic_long_inc(&p->rx_bpdu);
}
/* called under bridge lock */
@@ -524,6 +530,8 @@ void br_received_tcn_bpdu(struct net_bridge_port *p)
br_topology_change_detection(p->br);
br_topology_change_acknowledge(p);
}
+
+ atomic_long_inc(&p->rx_tcn);
}
/* Change bridge STP parameter */
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 7796dd9d42d7..e824e040846c 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -118,6 +118,8 @@ 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);
+
+ atomic_long_inc(&p->tx_bpdu);
}
/* called under bridge lock */
@@ -133,6 +135,8 @@ void br_send_tcn_bpdu(struct net_bridge_port *p)
buf[2] = 0;
buf[3] = BPDU_TYPE_TCN;
br_send_bpdu(p, buf, 4);
+
+ atomic_long_inc(&p->tx_tcn);
}
/*
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 7a59cdddd3ce..1fcd42ffa0ff 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -33,7 +33,7 @@ const struct brport_attribute brport_attr_##_name = { \
};
#define BRPORT_ATTR(_name, _mode, _show, _store) \
-const struct brport_attribute brport_attr_##_name = { \
+struct brport_attribute brport_attr_##_name = { \
.attr = {.name = __stringify(_name), \
.mode = _mode }, \
.show = _show, \
@@ -52,6 +52,13 @@ static int store_##_name(struct net_bridge_port *p, unsigned long v) \
static BRPORT_ATTR(_name, 0644, \
show_##_name, store_##_name)
+#define BRPORT_ATTR_STAT(_name) \
+static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
+{ \
+ return sprintf(buf, "%lu\n", atomic_long_read(&p->_name)); \
+} \
+static BRPORT_ATTR(_name, 0444, show_##_name, NULL)
+
static int store_flag(struct net_bridge_port *p, unsigned long v,
unsigned long mask)
{
@@ -352,6 +359,28 @@ const struct sysfs_ops brport_sysfs_ops = {
.store = brport_store,
};
+BRPORT_ATTR_STAT(rx_bpdu);
+BRPORT_ATTR_STAT(tx_bpdu);
+BRPORT_ATTR_STAT(rx_tcn);
+BRPORT_ATTR_STAT(tx_tcn);
+BRPORT_ATTR_STAT(transition_blk);
+BRPORT_ATTR_STAT(transition_fwd);
+
+static struct attribute *br_sysfs_attrs[] __ro_after_init = {
+ &brport_attr_rx_bpdu.attr,
+ &brport_attr_tx_bpdu.attr,
+ &brport_attr_rx_tcn.attr,
+ &brport_attr_tx_tcn.attr,
+ &brport_attr_transition_blk.attr,
+ &brport_attr_transition_fwd.attr,
+ NULL
+};
+
+static const struct attribute_group br_sysfs_group = {
+ .name = "statistics",
+ .attrs = br_sysfs_attrs,
+};
+
/*
* Add sysfs entries to ethernet device added to a bridge.
* Creates a brport subdirectory with bridge attributes.
@@ -374,6 +403,10 @@ int br_sysfs_addif(struct net_bridge_port *p)
return err;
}
+ err = sysfs_create_group(&p->kobj, &br_sysfs_group);
+ if (err)
+ return err;
+
strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
}
--
2.24.0
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