Merge branch 'trace-points-for-mv88e6xxx'

Vladimir Oltean says:

====================
Trace points for mv88e6xxx

While testing Hans Schultz' attempt at offloading MAB on mv88e6xxx:
https://patchwork.kernel.org/project/netdevbpf/cover/20221205185908.217520-1-netdev@kapio-technology.com/
I noticed that he still didn't get rid of the huge log spam caused by
ATU and VTU violations, even if we discussed about this:
https://patchwork.kernel.org/project/netdevbpf/cover/20221112203748.68995-1-netdev@kapio-technology.com/#25091076

It seems unlikely he's going to ever do this, so here is my own stab at
converting those messages to trace points. This is IMO an improvement
regardless of whether Hans' work with MAB lands or not, especially the
VTU violations which were quite annoying to me as well.

A small sample of before:

$ ./bridge_locked_port.sh lan1 lan2 lan3 lan4
[  114.465272] mv88e6085 d0032004.mdio-mii:10: VTU member violation for vid 100, source port 9
[  119.550508] mv88e6xxx_g1_vtu_prob_irq_thread_fn: 34 callbacks suppressed
[  120.369586] mv88e6085 d0032004.mdio-mii:10: VTU member violation for vid 100, source port 9
[  120.473658] mv88e6085 d0032004.mdio-mii:10: VTU member violation for vid 100, source port 9
[  125.535209] mv88e6xxx_g1_vtu_prob_irq_thread_fn: 21 callbacks suppressed
[  125.535243] mv88e6085 d0032004.mdio-mii:10: VTU member violation for vid 100, source port 9
[  126.174558] mv88e6085 d0032004.mdio-mii:10: VTU member violation for vid 100, source port 9
[  130.234055] mv88e6085 d0032004.mdio-mii:10: ATU miss violation for 00:01:02:03:04:01 fid 3 portvec 4 spid 2
[  130.338193] mv88e6085 d0032004.mdio-mii:10: ATU miss violation for 00:01:02:03:04:01 fid 3 portvec 4 spid 2
[  134.626099] mv88e6xxx_g1_atu_prob_irq_thread_fn: 38 callbacks suppressed
[  134.626132] mv88e6085 d0032004.mdio-mii:10: ATU miss violation for 00:01:02:03:04:01 fid 3 portvec 4 spid 2

and after:

$ trace-cmd record -e mv88e6xxx ./bridge_locked_port.sh lan1 lan2 lan3 lan4
$ trace-cmd report
   irq/35-moxtet-60    [001]    93.929734: mv88e6xxx_vtu_miss_violation: dev d0032004.mdio-mii:10 spid 9 vid 100
   irq/35-moxtet-60    [001]    94.183209: mv88e6xxx_vtu_miss_violation: dev d0032004.mdio-mii:10 spid 9 vid 100
   irq/35-moxtet-60    [001]   101.865545: mv88e6xxx_vtu_miss_violation: dev d0032004.mdio-mii:10 spid 9 vid 100
   irq/35-moxtet-60    [001]   121.831261: mv88e6xxx_vtu_member_violation: dev d0032004.mdio-mii:10 spid 9 vid 100
   irq/35-moxtet-60    [001]   122.371238: mv88e6xxx_vtu_member_violation: dev d0032004.mdio-mii:10 spid 9 vid 100
   irq/35-moxtet-60    [001]   148.452932: mv88e6xxx_atu_miss_violation: dev d0032004.mdio-mii:10 spid 2 portvec 0x4 addr 00:01:02:03:04:01 fid 0

v1 at:
https://patchwork.kernel.org/project/netdevbpf/cover/20221207233954.3619276-1-vladimir.oltean@nxp.com/
====================

Link: https://lore.kernel.org/r/20221209172817.371434-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

5 files changed, 174 insertions, 24 deletions

diff --git a/drivers/net/dsa/mv88e6xxx/Makefile b/drivers/net/dsa/mv88e6xxx/Makefile
index c8eca2b6f9594..49bf358b9c4fa 100644
--- a/drivers/net/dsa/mv88e6xxx/Makefile
+++ b/drivers/net/dsa/mv88e6xxx/Makefile
@@ -15,3 +15,7 @@ mv88e6xxx-objs += port_hidden.o
 mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
 mv88e6xxx-objs += serdes.o
 mv88e6xxx-objs += smi.o
+mv88e6xxx-objs += trace.o
+
+# for tracing framework to find trace.h
+CFLAGS_trace.o := -I$(src)
diff --git a/drivers/net/dsa/mv88e6xxx/global1_atu.c b/drivers/net/dsa/mv88e6xxx/global1_atu.c
index 40bd67a5c8e93..61ae2d61e25c7 100644
--- a/drivers/net/dsa/mv88e6xxx/global1_atu.c
+++ b/drivers/net/dsa/mv88e6xxx/global1_atu.c
@@ -12,6 +12,7 @@
 
 #include "chip.h"
 #include "global1.h"
+#include "trace.h"
 
 /* Offset 0x01: ATU FID Register */
 
@@ -114,6 +115,19 @@ static int mv88e6xxx_g1_atu_op_wait(struct mv88e6xxx_chip *chip)
 	return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_ATU_OP, bit, 0);
 }
 
+static int mv88e6xxx_g1_read_atu_violation(struct mv88e6xxx_chip *chip)
+{
+	int err;
+
+	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_OP,
+				 MV88E6XXX_G1_ATU_OP_BUSY |
+				 MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
+	if (err)
+		return err;
+
+	return mv88e6xxx_g1_atu_op_wait(chip);
+}
+
 static int mv88e6xxx_g1_atu_op(struct mv88e6xxx_chip *chip, u16 fid, u16 op)
 {
 	u16 val;
@@ -159,6 +173,41 @@ int mv88e6xxx_g1_atu_get_next(struct mv88e6xxx_chip *chip, u16 fid)
 	return mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_GET_NEXT_DB);
 }
 
+static int mv88e6xxx_g1_atu_fid_read(struct mv88e6xxx_chip *chip, u16 *fid)
+{
+	u16 val = 0, upper = 0, op = 0;
+	int err = -EOPNOTSUPP;
+
+	if (mv88e6xxx_num_databases(chip) > 256) {
+		err = mv88e6xxx_g1_read(chip, MV88E6352_G1_ATU_FID, &val);
+		val &= 0xfff;
+		if (err)
+			return err;
+	} else {
+		err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &op);
+		if (err)
+			return err;
+		if (mv88e6xxx_num_databases(chip) > 64) {
+			/* ATU DBNum[7:4] are located in ATU Control 15:12 */
+			err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL,
+						&upper);
+			if (err)
+				return err;
+
+			upper = (upper >> 8) & 0x00f0;
+		} else if (mv88e6xxx_num_databases(chip) > 16) {
+			/* ATU DBNum[5:4] are located in ATU Operation 9:8 */
+			upper = (op >> 4) & 0x30;
+		}
+
+		/* ATU DBNum[3:0] are located in ATU Operation 3:0 */
+		val = (op & 0xf) | upper;
+	}
+	*fid = val;
+
+	return err;
+}
+
 /* Offset 0x0C: ATU Data Register */
 
 static int mv88e6xxx_g1_atu_data_read(struct mv88e6xxx_chip *chip,
@@ -353,14 +402,12 @@ static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
 {
 	struct mv88e6xxx_chip *chip = dev_id;
 	struct mv88e6xxx_atu_entry entry;
-	int spid;
-	int err;
-	u16 val;
+	int err, spid;
+	u16 val, fid;
 
 	mv88e6xxx_reg_lock(chip);
 
-	err = mv88e6xxx_g1_atu_op(chip, 0,
-				  MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
+	err = mv88e6xxx_g1_read_atu_violation(chip);
 	if (err)
 		goto out;
 
@@ -368,6 +415,10 @@ static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
 	if (err)
 		goto out;
 
+	err = mv88e6xxx_g1_atu_fid_read(chip, &fid);
+	if (err)
+		goto out;
+
 	err = mv88e6xxx_g1_atu_data_read(chip, &entry);
 	if (err)
 		goto out;
@@ -378,30 +429,24 @@ static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
 
 	spid = entry.state;
 
-	if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
-		dev_err_ratelimited(chip->dev,
-				    "ATU age out violation for %pM\n",
-				    entry.mac);
-	}
-
 	if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION) {
-		dev_err_ratelimited(chip->dev,
-				    "ATU member violation for %pM portvec %x spid %d\n",
-				    entry.mac, entry.portvec, spid);
+		trace_mv88e6xxx_atu_member_violation(chip->dev, spid,
+						     entry.portvec, entry.mac,
+						     fid);
 		chip->ports[spid].atu_member_violation++;
 	}
 
 	if (val & MV88E6XXX_G1_ATU_OP_MISS_VIOLATION) {
-		dev_err_ratelimited(chip->dev,
-				    "ATU miss violation for %pM portvec %x spid %d\n",
-				    entry.mac, entry.portvec, spid);
+		trace_mv88e6xxx_atu_miss_violation(chip->dev, spid,
+						   entry.portvec, entry.mac,
+						   fid);
 		chip->ports[spid].atu_miss_violation++;
 	}
 
 	if (val & MV88E6XXX_G1_ATU_OP_FULL_VIOLATION) {
-		dev_err_ratelimited(chip->dev,
-				    "ATU full violation for %pM portvec %x spid %d\n",
-				    entry.mac, entry.portvec, spid);
+		trace_mv88e6xxx_atu_full_violation(chip->dev, spid,
+						   entry.portvec, entry.mac,
+						   fid);
 		chip->ports[spid].atu_full_violation++;
 	}
 	mv88e6xxx_reg_unlock(chip);
diff --git a/drivers/net/dsa/mv88e6xxx/global1_vtu.c b/drivers/net/dsa/mv88e6xxx/global1_vtu.c
index 38e18f5811bfb..bcfb4a812055c 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.c b/drivers/net/dsa/mv88e6xxx/trace.c
new file mode 100644
index 0000000000000..7833cb50ca5d7
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/trace.c
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright 2022 NXP
+ */
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/drivers/net/dsa/mv88e6xxx/trace.h b/drivers/net/dsa/mv88e6xxx/trace.h
new file mode 100644
index 0000000000000..f59ca04768e79
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/trace.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright 2022 NXP
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM	mv88e6xxx
+
+#if !defined(_MV88E6XXX_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _MV88E6XXX_TRACE_H
+
+#include <linux/device.h>
+#include <linux/if_ether.h>
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(mv88e6xxx_atu_violation,
+
+	TP_PROTO(const struct device *dev, int spid, u16 portvec,
+		 const unsigned char *addr, u16 fid),
+
+	TP_ARGS(dev, spid, portvec, addr, fid),
+
+	TP_STRUCT__entry(
+		__string(name, dev_name(dev))
+		__field(int, spid)
+		__field(u16, portvec)
+		__array(unsigned char, addr, ETH_ALEN)
+		__field(u16, fid)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dev_name(dev));
+		__entry->spid = spid;
+		__entry->portvec = portvec;
+		memcpy(__entry->addr, addr, ETH_ALEN);
+		__entry->fid = fid;
+	),
+
+	TP_printk("dev %s spid %d portvec 0x%x addr %pM fid %u",
+		  __get_str(name), __entry->spid, __entry->portvec,
+		  __entry->addr, __entry->fid)
+);
+
+DEFINE_EVENT(mv88e6xxx_atu_violation, mv88e6xxx_atu_member_violation,
+	     TP_PROTO(const struct device *dev, int spid, u16 portvec,
+		      const unsigned char *addr, u16 fid),
+	     TP_ARGS(dev, spid, portvec, addr, fid));
+
+DEFINE_EVENT(mv88e6xxx_atu_violation, mv88e6xxx_atu_miss_violation,
+	     TP_PROTO(const struct device *dev, int spid, u16 portvec,
+		      const unsigned char *addr, u16 fid),
+	     TP_ARGS(dev, spid, portvec, addr, fid));
+
+DEFINE_EVENT(mv88e6xxx_atu_violation, mv88e6xxx_atu_full_violation,
+	     TP_PROTO(const struct device *dev, int spid, u16 portvec,
+		      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 */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE	trace
+/* This part must be outside protection */
+#include <trace/define_trace.h>