netdev - [PATCH v2 net-next 4/4] net: dsa: mv88e6xxx: replace VTU violation prints with trace points

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Date:   Fri,  9 Dec 2022 19:28:17 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Hans J. Schultz" <netdev@...io-technology.com>,
        Saeed Mahameed <saeed@...nel.org>
Subject: [PATCH v2 net-next 4/4] net: dsa: mv88e6xxx: replace VTU violation prints with trace points

It is possible to trigger these VTU violation messages very easily,
it's only necessary to send packets with an unknown VLAN ID to a port
that belongs to a VLAN-aware bridge.

Do a similar thing as for ATU violation messages, and hide them in the
kernel's trace buffer.

New usage model:

$ trace-cmd list | grep mv88e6xxx
mv88e6xxx
mv88e6xxx:mv88e6xxx_vtu_miss_violation
mv88e6xxx:mv88e6xxx_vtu_member_violation
$ trace-cmd report

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v1->v2: rename port to spid

 drivers/net/dsa/mv88e6xxx/global1_vtu.c |  7 +++---
 drivers/net/dsa/mv88e6xxx/trace.h       | 30 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/global1_vtu.c b/drivers/net/dsa/mv88e6xxx/global1_vtu.c
index 38e18f5811bf..bcfb4a812055 100644
--- a/drivers/net/dsa/mv88e6xxx/global1_vtu.c
+++ b/drivers/net/dsa/mv88e6xxx/global1_vtu.c
@@ -13,6 +13,7 @@
 
 #include "chip.h"
 #include "global1.h"
+#include "trace.h"
 
 /* Offset 0x02: VTU FID Register */
 
@@ -628,14 +629,12 @@ static irqreturn_t mv88e6xxx_g1_vtu_prob_irq_thread_fn(int irq, void *dev_id)
 	spid = val & MV88E6XXX_G1_VTU_OP_SPID_MASK;
 
 	if (val & MV88E6XXX_G1_VTU_OP_MEMBER_VIOLATION) {
-		dev_err_ratelimited(chip->dev, "VTU member violation for vid %d, source port %d\n",
-				    vid, spid);
+		trace_mv88e6xxx_vtu_member_violation(chip->dev, spid, vid);
 		chip->ports[spid].vtu_member_violation++;
 	}
 
 	if (val & MV88E6XXX_G1_VTU_OP_MISS_VIOLATION) {
-		dev_dbg_ratelimited(chip->dev, "VTU miss violation for vid %d, source port %d\n",
-				    vid, spid);
+		trace_mv88e6xxx_vtu_miss_violation(chip->dev, spid, vid);
 		chip->ports[spid].vtu_miss_violation++;
 	}
 
diff --git a/drivers/net/dsa/mv88e6xxx/trace.h b/drivers/net/dsa/mv88e6xxx/trace.h
index d9ab5c8dee55..f59ca04768e7 100644
--- a/drivers/net/dsa/mv88e6xxx/trace.h
+++ b/drivers/net/dsa/mv88e6xxx/trace.h
@@ -55,6 +55,36 @@ DEFINE_EVENT(mv88e6xxx_atu_violation, mv88e6xxx_atu_full_violation,
 		      const unsigned char *addr, u16 fid),
 	     TP_ARGS(dev, spid, portvec, addr, fid));
 
+DECLARE_EVENT_CLASS(mv88e6xxx_vtu_violation,
+
+	TP_PROTO(const struct device *dev, int spid, u16 vid),
+
+	TP_ARGS(dev, spid, vid),
+
+	TP_STRUCT__entry(
+		__string(name, dev_name(dev))
+		__field(int, spid)
+		__field(u16, vid)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dev_name(dev));
+		__entry->spid = spid;
+		__entry->vid = vid;
+	),
+
+	TP_printk("dev %s spid %d vid %u",
+		  __get_str(name), __entry->spid, __entry->vid)
+);
+
+DEFINE_EVENT(mv88e6xxx_vtu_violation, mv88e6xxx_vtu_member_violation,
+	     TP_PROTO(const struct device *dev, int spid, u16 vid),
+	     TP_ARGS(dev, spid, vid));
+
+DEFINE_EVENT(mv88e6xxx_vtu_violation, mv88e6xxx_vtu_miss_violation,
+	     TP_PROTO(const struct device *dev, int spid, u16 vid),
+	     TP_ARGS(dev, spid, vid));
+
 #endif /* _MV88E6XXX_TRACE_H */
 
 /* We don't want to use include/trace/events */
-- 
2.34.1