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Date: Fri, 7 Apr 2023 17:14:51 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next 2/2] net: dsa: add trace points for VLAN operations
These are not as critical as the FDB/MDB trace points (I'm not aware of
outstanding VLAN related bugs), but maybe they are useful to somebody,
either debugging something or simply trying to learn more.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
net/dsa/switch.c | 24 ++++++++--
net/dsa/trace.h | 118 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 137 insertions(+), 5 deletions(-)
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index ff1b5d980e37..8c9a9f94b756 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -695,8 +695,12 @@ static int dsa_port_do_vlan_add(struct dsa_port *dp,
int err = 0;
/* No need to bother with refcounting for user ports. */
- if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
- return ds->ops->port_vlan_add(ds, port, vlan, extack);
+ if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
+ err = ds->ops->port_vlan_add(ds, port, vlan, extack);
+ trace_dsa_vlan_add_hw(dp, vlan, err);
+
+ return err;
+ }
/* No need to propagate on shared ports the existing VLANs that were
* re-notified after just the flags have changed. This would cause a
@@ -711,6 +715,7 @@ static int dsa_port_do_vlan_add(struct dsa_port *dp,
v = dsa_vlan_find(&dp->vlans, vlan);
if (v) {
refcount_inc(&v->refcount);
+ trace_dsa_vlan_add_bump(dp, vlan, &v->refcount);
goto out;
}
@@ -721,6 +726,7 @@ static int dsa_port_do_vlan_add(struct dsa_port *dp,
}
err = ds->ops->port_vlan_add(ds, port, vlan, extack);
+ trace_dsa_vlan_add_hw(dp, vlan, err);
if (err) {
kfree(v);
goto out;
@@ -745,21 +751,29 @@ static int dsa_port_do_vlan_del(struct dsa_port *dp,
int err = 0;
/* No need to bother with refcounting for user ports */
- if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
- return ds->ops->port_vlan_del(ds, port, vlan);
+ if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
+ err = ds->ops->port_vlan_del(ds, port, vlan);
+ trace_dsa_vlan_del_hw(dp, vlan, err);
+
+ return err;
+ }
mutex_lock(&dp->vlans_lock);
v = dsa_vlan_find(&dp->vlans, vlan);
if (!v) {
+ trace_dsa_vlan_del_not_found(dp, vlan);
err = -ENOENT;
goto out;
}
- if (!refcount_dec_and_test(&v->refcount))
+ if (!refcount_dec_and_test(&v->refcount)) {
+ trace_dsa_vlan_del_drop(dp, vlan, &v->refcount);
goto out;
+ }
err = ds->ops->port_vlan_del(ds, port, vlan);
+ trace_dsa_vlan_del_hw(dp, vlan, err);
if (err) {
refcount_set(&v->refcount, 1);
goto out;
diff --git a/net/dsa/trace.h b/net/dsa/trace.h
index 42c8bbc7d472..567f29a39707 100644
--- a/net/dsa/trace.h
+++ b/net/dsa/trace.h
@@ -9,7 +9,9 @@
#define _NET_DSA_TRACE_H
#include <net/dsa.h>
+#include <net/switchdev.h>
#include <linux/etherdevice.h>
+#include <linux/if_bridge.h>
#include <linux/refcount.h>
#include <linux/tracepoint.h>
@@ -318,6 +320,122 @@ TRACE_EVENT(dsa_lag_fdb_del_not_found,
__get_str(dev), __entry->addr, __entry->vid, __entry->db_buf)
);
+DECLARE_EVENT_CLASS(dsa_vlan_op_hw,
+
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan, int err),
+
+ TP_ARGS(dp, vlan, err),
+
+ TP_STRUCT__entry(
+ __string(dev, dev_name(dp->ds->dev))
+ __string(kind, dsa_port_kind(dp))
+ __field(int, port)
+ __field(u16, vid)
+ __field(u16, flags)
+ __field(bool, changed)
+ __field(int, err)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dev, dev_name(dp->ds->dev));
+ __assign_str(kind, dsa_port_kind(dp));
+ __entry->port = dp->index;
+ __entry->vid = vlan->vid;
+ __entry->flags = vlan->flags;
+ __entry->changed = vlan->changed;
+ __entry->err = err;
+ ),
+
+ TP_printk("%s %s port %d vid %u%s%s%s",
+ __get_str(dev), __get_str(kind), __entry->port, __entry->vid,
+ __entry->flags & BRIDGE_VLAN_INFO_PVID ? " pvid" : "",
+ __entry->flags & BRIDGE_VLAN_INFO_UNTAGGED ? " untagged" : "",
+ __entry->changed ? " (changed)" : "")
+);
+
+DEFINE_EVENT(dsa_vlan_op_hw, dsa_vlan_add_hw,
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan, int err),
+ TP_ARGS(dp, vlan, err));
+
+DEFINE_EVENT(dsa_vlan_op_hw, dsa_vlan_del_hw,
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan, int err),
+ TP_ARGS(dp, vlan, err));
+
+DECLARE_EVENT_CLASS(dsa_vlan_op_refcount,
+
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan,
+ const refcount_t *refcount),
+
+ TP_ARGS(dp, vlan, refcount),
+
+ TP_STRUCT__entry(
+ __string(dev, dev_name(dp->ds->dev))
+ __string(kind, dsa_port_kind(dp))
+ __field(int, port)
+ __field(u16, vid)
+ __field(u16, flags)
+ __field(bool, changed)
+ __field(unsigned int, refcount)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dev, dev_name(dp->ds->dev));
+ __assign_str(kind, dsa_port_kind(dp));
+ __entry->port = dp->index;
+ __entry->vid = vlan->vid;
+ __entry->flags = vlan->flags;
+ __entry->changed = vlan->changed;
+ __entry->refcount = refcount_read(refcount);
+ ),
+
+ TP_printk("%s %s port %d vid %u%s%s%s refcount %u",
+ __get_str(dev), __get_str(kind), __entry->port, __entry->vid,
+ __entry->flags & BRIDGE_VLAN_INFO_PVID ? " pvid" : "",
+ __entry->flags & BRIDGE_VLAN_INFO_UNTAGGED ? " untagged" : "",
+ __entry->changed ? " (changed)" : "", __entry->refcount)
+);
+
+DEFINE_EVENT(dsa_vlan_op_refcount, dsa_vlan_add_bump,
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan,
+ const refcount_t *refcount),
+ TP_ARGS(dp, vlan, refcount));
+
+DEFINE_EVENT(dsa_vlan_op_refcount, dsa_vlan_del_drop,
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan,
+ const refcount_t *refcount),
+ TP_ARGS(dp, vlan, refcount));
+
+TRACE_EVENT(dsa_vlan_del_not_found,
+
+ TP_PROTO(const struct dsa_port *dp,
+ const struct switchdev_obj_port_vlan *vlan),
+
+ TP_ARGS(dp, vlan),
+
+ TP_STRUCT__entry(
+ __string(dev, dev_name(dp->ds->dev))
+ __string(kind, dsa_port_kind(dp))
+ __field(int, port)
+ __field(u16, vid)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dev, dev_name(dp->ds->dev));
+ __assign_str(kind, dsa_port_kind(dp));
+ __entry->port = dp->index;
+ __entry->vid = vlan->vid;
+ ),
+
+ TP_printk("%s %s port %d vid %u",
+ __get_str(dev), __get_str(kind), __entry->port, __entry->vid)
+);
+
#endif /* _NET_DSA_TRACE_H */
/* We don't want to use include/trace/events */
--
2.34.1
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