[PATCH net-next v2 0/5] net: mvpp2: add debugfs interface

[PATCH net-next v2 0/5] net: mvpp2: add debugfs interface

[Maxime Chevallier]

The PPv2 Header Parser and Classifier are not straightforward to debug,
having easy access to some of the many lookup tables configuration is
helpful during development and debug.

This series adds a basic debugfs interface, allowing to read data from
the Header Parser and some of the Classifier tables.

For now, the interface is read-only, and contains only some basic info.

This was actually used during RSS development, and might be useful to
troubleshoot some issues we might find.

The first patch of the series converts the mvpp2 files to SPDX, which
eases adding the new debugfs dedicated file.

The second patch adds the interface, and exposes basic Header Parser data.

The 3rd patch adds a hit counter for the Header Parser TCAM.

The 4th patch exposes classifier info.

The 5th patch adds some hit counters for some of the classifier engines.

Changes since V1:
- Rebased on the lastest net-next
- Made cls_flow_get non static so that it can be used in mvpp2_debugfs

Antoine Tenart (1):
  net: mvpp2: switch to SPDX identifiers

Maxime Chevallier (4):
  net: mvpp2: add a debugfs interface for the Header Parser
  net: mvpp2: debugfs: add hit counter stats for Header Parser entries
  net: mvpp2: debugfs: add entries for classifier flows
  net: mvpp2: debugfs: add classifier hit counters

 drivers/net/ethernet/marvell/mvpp2/Makefile        |   2 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h         |  23 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c     |  54 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h     |  26 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 703 +++++++++++++++++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c    |   9 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c     |  33 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h     |  16 +-
 8 files changed, 830 insertions(+), 36 deletions(-)
 create mode 100644 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c

-- 
2.11.0

[PATCH net-next v2 1/5] net: mvpp2: switch to SPDX identifiers

[Maxime Chevallier]

From: Antoine Tenart <antoine.tenart@bootlin.com>

Use the appropriate SPDX license identifiers and drop the license text.
This patch is only cosmetic.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h      | 5 +----
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c  | 5 +----
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h  | 5 +----
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 5 +----
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c  | 5 +----
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h  | 5 +----
 6 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 749d9720bf5e..3e470d6fcf64 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Definitions for Marvell PPv2 network controller for Armada 375 SoC.
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 #ifndef _MVPP2_H_
 #define _MVPP2_H_
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index 723d0ba6f78d..125466c66f1a 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * RSS and Classifier helpers for Marvell PPv2 Network Controller
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include "mvpp2.h"
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
index 151d791a91b6..e159489a20ea 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * RSS and Classifier definitions for Marvell PPv2 Network Controller
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #ifndef _MVPP2_CLS_H_
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 2283be12d700..2d690b082b89 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for Marvell PPv2 network controller for Armada 375 SoC.
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include <linux/acpi.h>
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
index acf9f78d5f80..2a8d25139a8f 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Header Parser helpers for Marvell PPv2 Network Controller
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 
 #include <linux/kernel.h>
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
index 368e90b54477..eb81db1a301f 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Header Parser definitions for Marvell PPv2 Network Controller
  *
  * Copyright (C) 2014 Marvell
  *
  * Marcin Wojtas <mw@semihalf.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 #ifndef _MVPP2_PRS_H_
 #define _MVPP2_PRS_H_
-- 
2.11.0

[PATCH net-next v2 2/5] net: mvpp2: add a debugfs interface for the Header Parser

[Maxime Chevallier]

Marvell PPv2 Packer Header Parser has a TCAM based filter, that is not
trivial to configure and debug. Being able to dump TCAM entries from
userspace can be really helpful to help development of new features
and debug existing ones.

This commit adds a basic debugfs interface for the PPv2 driver, focusing
on TCAM related features.

<mnt>/mvpp2/ --- f2000000.ethernet
              \- f4000000.ethernet --- parser --- 000 ...
                                    |          \- 001
                                    |          \- ...
                                    |          \- 255 --- ai
                                    |                  \- header_data
                                    |                  \- lookup_id
                                    |                  \- sram
                                    |                  \- valid
                                    \- eth1 ...
                                    \- eth2 --- mac_filter
                                             \- parser_entries
                                             \- vid_filter

There's one directory per PPv2 instance, named after pdev->name to make
sure names are uniques. In each of these directories, there's :

 - one directory per interface on the controller, each containing :

   - "mac_filter", which lists all filtered addresses for this port
     (based on TCAM, not on the kernel's uc / mc lists)

   - "parser_entries", which lists the indices of all valid TCAM
      entries that have this port in their port map

   - "vid_filter", which lists the vids allowed on this port, based on
     TCAM

 - one "parser" directory (the parser is common to all ports), containing :

   - one directory per TCAM entry (256 of them, from 0 to 255), each
     containing :

     - "ai" : Contains the 1 byte Additional Info field from TCAM, and

     - "header_data" : Contains the 8 bytes Header Data extracted from
       the packet

     - "lookup_id" : Contains the 4 bits LU_ID

     - "sram" : contains the raw SRAM data, which is the result of the TCAM
		lookup. This readonly at the moment.

     - "valid" : Indicates if the entry is valid of not.

All entries are read-only, and everything is output in hex form.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/Makefile        |   2 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h         |   7 +
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 344 +++++++++++++++++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c    |   4 +
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c     |  12 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h     |   9 +
 6 files changed, 371 insertions(+), 7 deletions(-)
 create mode 100644 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c

diff --git a/drivers/net/ethernet/marvell/mvpp2/Makefile b/drivers/net/ethernet/marvell/mvpp2/Makefile
index 4d11dd9e3246..51f65a202c6e 100644
--- a/drivers/net/ethernet/marvell/mvpp2/Makefile
+++ b/drivers/net/ethernet/marvell/mvpp2/Makefile
@@ -4,4 +4,4 @@
 #
 obj-$(CONFIG_MVPP2) := mvpp2.o
 
-mvpp2-objs := mvpp2_main.o mvpp2_prs.o mvpp2_cls.o
+mvpp2-objs := mvpp2_main.o mvpp2_prs.o mvpp2_cls.o mvpp2_debugfs.o
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 3e470d6fcf64..439f14192b08 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -746,6 +746,9 @@ struct mvpp2 {
 	/* Workqueue to gather hardware statistics */
 	char queue_name[30];
 	struct workqueue_struct *stats_queue;
+
+	/* Debugfs root entry */
+	struct dentry *dbgfs_dir;
 };
 
 struct mvpp2_pcpu_stats {
@@ -1089,4 +1092,8 @@ u32 mvpp2_percpu_read(struct mvpp2 *priv, int cpu, u32 offset);
 void mvpp2_percpu_write_relaxed(struct mvpp2 *priv, int cpu, u32 offset,
 				u32 data);
 
+void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name);
+
+void mvpp2_dbgfs_cleanup(struct mvpp2 *priv);
+
 #endif
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
new file mode 100644
index 000000000000..e8a242b56519
--- /dev/null
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Marvell PPv2 network controller for Armada 375 SoC.
+ *
+ * Copyright (C) 2018 Marvell
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+
+#include "mvpp2.h"
+#include "mvpp2_prs.h"
+
+struct mvpp2_dbgfs_prs_entry {
+	int tid;
+	struct mvpp2 *priv;
+};
+
+static int mvpp2_dbgfs_port_vid_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	unsigned char byte[2], enable[2];
+	struct mvpp2 *priv = port->priv;
+	struct mvpp2_prs_entry pe;
+	unsigned long pmap;
+	u16 rvid;
+	int tid;
+
+	for (tid = MVPP2_PRS_VID_PORT_FIRST(port->id);
+	     tid <= MVPP2_PRS_VID_PORT_LAST(port->id); tid++) {
+		mvpp2_prs_init_from_hw(priv, &pe, tid);
+
+		pmap = mvpp2_prs_tcam_port_map_get(&pe);
+
+		if (!priv->prs_shadow[tid].valid)
+			continue;
+
+		if (!test_bit(port->id, &pmap))
+			continue;
+
+		mvpp2_prs_tcam_data_byte_get(&pe, 2, &byte[0], &enable[0]);
+		mvpp2_prs_tcam_data_byte_get(&pe, 3, &byte[1], &enable[1]);
+
+		rvid = ((byte[0] & 0xf) << 8) + byte[1];
+
+		seq_printf(s, "%u\n", rvid);
+	}
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_vid);
+
+static int mvpp2_dbgfs_port_parser_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	struct mvpp2 *priv = port->priv;
+	struct mvpp2_prs_entry pe;
+	unsigned long pmap;
+	int i;
+
+	for (i = 0; i < MVPP2_PRS_TCAM_SRAM_SIZE; i++) {
+		mvpp2_prs_init_from_hw(port->priv, &pe, i);
+
+		pmap = mvpp2_prs_tcam_port_map_get(&pe);
+		if (priv->prs_shadow[i].valid && test_bit(port->id, &pmap))
+			seq_printf(s, "%03d\n", i);
+	}
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_parser);
+
+static int mvpp2_dbgfs_filter_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	struct mvpp2 *priv = port->priv;
+	struct mvpp2_prs_entry pe;
+	unsigned long pmap;
+	int index, tid;
+
+	for (tid = MVPP2_PE_MAC_RANGE_START;
+	     tid <= MVPP2_PE_MAC_RANGE_END; tid++) {
+		unsigned char da[ETH_ALEN], da_mask[ETH_ALEN];
+
+		if (!priv->prs_shadow[tid].valid ||
+		    priv->prs_shadow[tid].lu != MVPP2_PRS_LU_MAC ||
+		    priv->prs_shadow[tid].udf != MVPP2_PRS_UDF_MAC_DEF)
+			continue;
+
+		mvpp2_prs_init_from_hw(priv, &pe, tid);
+
+		pmap = mvpp2_prs_tcam_port_map_get(&pe);
+
+		/* We only want entries active on this port */
+		if (!test_bit(port->id, &pmap))
+			continue;
+
+		/* Read mac addr from entry */
+		for (index = 0; index < ETH_ALEN; index++)
+			mvpp2_prs_tcam_data_byte_get(&pe, index, &da[index],
+						     &da_mask[index]);
+
+		seq_printf(s, "%pM\n", da);
+	}
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_filter);
+
+static int mvpp2_dbgfs_prs_lu_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2 *priv = entry->priv;
+
+	seq_printf(s, "%x\n", priv->prs_shadow[entry->tid].lu);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_lu);
+
+static int mvpp2_dbgfs_prs_pmap_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2_prs_entry pe;
+	unsigned int pmap;
+
+	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);
+
+	pmap = mvpp2_prs_tcam_port_map_get(&pe);
+	pmap &= MVPP2_PRS_PORT_MASK;
+
+	seq_printf(s, "%02x\n", pmap);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_pmap);
+
+static int mvpp2_dbgfs_prs_ai_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2_prs_entry pe;
+	unsigned char ai, ai_mask;
+
+	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);
+
+	ai = pe.tcam[MVPP2_PRS_TCAM_AI_WORD] & MVPP2_PRS_AI_MASK;
+	ai_mask = (pe.tcam[MVPP2_PRS_TCAM_AI_WORD] >> 16) & MVPP2_PRS_AI_MASK;
+
+	seq_printf(s, "%02x %02x\n", ai, ai_mask);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_ai);
+
+static int mvpp2_dbgfs_prs_hdata_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2_prs_entry pe;
+	unsigned char data[8], mask[8];
+	int i;
+
+	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);
+
+	for (i = 0; i < 8; i++)
+		mvpp2_prs_tcam_data_byte_get(&pe, i, &data[i], &mask[i]);
+
+	seq_printf(s, "%*phN %*phN\n", 8, data, 8, mask);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_hdata);
+
+static int mvpp2_dbgfs_prs_sram_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2_prs_entry pe;
+
+	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);
+
+	seq_printf(s, "%*phN\n", 14, pe.sram);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_sram);
+
+static int mvpp2_dbgfs_prs_valid_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	struct mvpp2 *priv = entry->priv;
+	int tid = entry->tid;
+
+	seq_printf(s, "%d\n", priv->prs_shadow[tid].valid ? 1 : 0);
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_prs_valid_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mvpp2_dbgfs_prs_valid_show, inode->i_private);
+}
+
+static int mvpp2_dbgfs_prs_valid_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct mvpp2_dbgfs_prs_entry *entry = seq->private;
+
+	kfree(entry);
+	return single_release(inode, file);
+}
+
+static const struct file_operations mvpp2_dbgfs_prs_valid_fops = {
+	.open = mvpp2_dbgfs_prs_valid_open,
+	.read = seq_read,
+	.release = mvpp2_dbgfs_prs_valid_release,
+};
+
+static int mvpp2_dbgfs_prs_entry_init(struct dentry *parent,
+				      struct mvpp2 *priv, int tid)
+{
+	struct mvpp2_dbgfs_prs_entry *entry;
+	struct dentry *prs_entry_dir;
+	char prs_entry_name[10];
+
+	if (tid >= MVPP2_PRS_TCAM_SRAM_SIZE)
+		return -EINVAL;
+
+	sprintf(prs_entry_name, "%03d", tid);
+
+	prs_entry_dir = debugfs_create_dir(prs_entry_name, parent);
+	if (!prs_entry_dir)
+		return -ENOMEM;
+
+	/* The 'valid' entry's ops will free that */
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	entry->tid = tid;
+	entry->priv = priv;
+
+	/* Create each attr */
+	debugfs_create_file("sram", 0444, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_sram_fops);
+
+	debugfs_create_file("valid", 0644, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_valid_fops);
+
+	debugfs_create_file("lookup_id", 0644, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_lu_fops);
+
+	debugfs_create_file("ai", 0644, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_ai_fops);
+
+	debugfs_create_file("header_data", 0644, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_hdata_fops);
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_prs_init(struct dentry *parent, struct mvpp2 *priv)
+{
+	struct dentry *prs_dir;
+	int i, ret;
+
+	prs_dir = debugfs_create_dir("parser", parent);
+	if (!prs_dir)
+		return -ENOMEM;
+
+	for (i = 0; i < MVPP2_PRS_TCAM_SRAM_SIZE; i++) {
+		ret = mvpp2_dbgfs_prs_entry_init(prs_dir, priv, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_port_init(struct dentry *parent,
+				 struct mvpp2_port *port)
+{
+	struct dentry *port_dir;
+
+	port_dir = debugfs_create_dir(port->dev->name, parent);
+	if (IS_ERR(port_dir))
+		return PTR_ERR(port_dir);
+
+	debugfs_create_file("parser_entries", 0444, port_dir, port,
+			    &mvpp2_dbgfs_port_parser_fops);
+
+	debugfs_create_file("mac_filter", 0444, port_dir, port,
+			    &mvpp2_dbgfs_filter_fops);
+
+	debugfs_create_file("vid_filter", 0444, port_dir, port,
+			    &mvpp2_dbgfs_port_vid_fops);
+
+	return 0;
+}
+
+void mvpp2_dbgfs_cleanup(struct mvpp2 *priv)
+{
+	debugfs_remove_recursive(priv->dbgfs_dir);
+}
+
+void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name)
+{
+	struct dentry *mvpp2_dir, *mvpp2_root;
+	int ret, i;
+
+	mvpp2_root = debugfs_lookup(MVPP2_DRIVER_NAME, NULL);
+	if (!mvpp2_root) {
+		mvpp2_root = debugfs_create_dir(MVPP2_DRIVER_NAME, NULL);
+		if (IS_ERR(mvpp2_root))
+			return;
+	}
+
+	mvpp2_dir = debugfs_create_dir(name, mvpp2_root);
+	if (IS_ERR(mvpp2_dir))
+		return;
+
+	priv->dbgfs_dir = mvpp2_dir;
+
+	ret = mvpp2_dbgfs_prs_init(mvpp2_dir, priv);
+	if (ret)
+		goto err;
+
+	for (i = 0; i < priv->port_count; i++) {
+		ret = mvpp2_dbgfs_port_init(mvpp2_dir, priv->port_list[i]);
+		if (ret)
+			goto err;
+	}
+
+	return;
+err:
+	mvpp2_dbgfs_cleanup(priv);
+}
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 2d690b082b89..32d785b616e1 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5289,6 +5289,8 @@ static int mvpp2_probe(struct platform_device *pdev)
 		goto err_port_probe;
 	}
 
+	mvpp2_dbgfs_init(priv, pdev->name);
+
 	platform_set_drvdata(pdev, priv);
 	return 0;
 
@@ -5322,6 +5324,8 @@ static int mvpp2_remove(struct platform_device *pdev)
 	struct fwnode_handle *port_fwnode;
 	int i = 0;
 
+	mvpp2_dbgfs_cleanup(priv);
+
 	flush_workqueue(priv->stats_queue);
 	destroy_workqueue(priv->stats_queue);
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
index 2a8d25139a8f..f133d820f0fa 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
@@ -43,8 +43,8 @@ static int mvpp2_prs_hw_write(struct mvpp2 *priv, struct mvpp2_prs_entry *pe)
 }
 
 /* Initialize tcam entry from hw */
-static int mvpp2_prs_init_from_hw(struct mvpp2 *priv,
-				  struct mvpp2_prs_entry *pe, int tid)
+int mvpp2_prs_init_from_hw(struct mvpp2 *priv, struct mvpp2_prs_entry *pe,
+			   int tid)
 {
 	int i;
 
@@ -126,7 +126,7 @@ static void mvpp2_prs_tcam_port_map_set(struct mvpp2_prs_entry *pe,
 }
 
 /* Obtain port map from tcam sw entry */
-static unsigned int mvpp2_prs_tcam_port_map_get(struct mvpp2_prs_entry *pe)
+unsigned int mvpp2_prs_tcam_port_map_get(struct mvpp2_prs_entry *pe)
 {
 	return (~pe->tcam[MVPP2_PRS_TCAM_PORT_WORD] >> 24) & MVPP2_PRS_PORT_MASK;
 }
@@ -145,9 +145,9 @@ static void mvpp2_prs_tcam_data_byte_set(struct mvpp2_prs_entry *pe,
 }
 
 /* Get byte of data and its enable bits from tcam sw entry */
-static void mvpp2_prs_tcam_data_byte_get(struct mvpp2_prs_entry *pe,
-					 unsigned int offs, unsigned char *byte,
-					 unsigned char *enable)
+void mvpp2_prs_tcam_data_byte_get(struct mvpp2_prs_entry *pe,
+				  unsigned int offs, unsigned char *byte,
+				  unsigned char *enable)
 {
 	int pos = MVPP2_PRS_BYTE_IN_WORD(offs) * BITS_PER_BYTE;
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
index eb81db1a301f..67b67ccb387d 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
@@ -294,6 +294,15 @@ struct mvpp2_prs_shadow {
 
 int mvpp2_prs_default_init(struct platform_device *pdev, struct mvpp2 *priv);
 
+int mvpp2_prs_init_from_hw(struct mvpp2 *priv, struct mvpp2_prs_entry *pe,
+			   int tid);
+
+unsigned int mvpp2_prs_tcam_port_map_get(struct mvpp2_prs_entry *pe);
+
+void mvpp2_prs_tcam_data_byte_get(struct mvpp2_prs_entry *pe,
+				  unsigned int offs, unsigned char *byte,
+				  unsigned char *enable);
+
 int mvpp2_prs_mac_da_accept(struct mvpp2_port *port, const u8 *da, bool add);
 
 int mvpp2_prs_tag_mode_set(struct mvpp2 *priv, int port, int type);
-- 
2.11.0

[PATCH net-next v2 3/5] net: mvpp2: debugfs: add hit counter stats for Header Parser entries

[Maxime Chevallier]

One helpful feature to help debug the Header Parser TCAM filter in PPv2
is to be able to see if the entries did match something when a packet
comes in. This can be done by using the built-in hit counter for TCAM
entries.

This commit implements reading the counter, and exposing its value on
debugfs for each filter entry.

The counter is a 16-bits clear-on-read value, located at:
 .../mvpp2/<controller>/parser/XXX/hits

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h         |  3 +++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 19 +++++++++++++++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c     | 16 ++++++++++++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h     |  2 ++
 4 files changed, 40 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 439f14192b08..70b3e9cd0d84 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -64,6 +64,9 @@
 #define MVPP2_PRS_SRAM_DATA_REG(idx)		(0x1204 + (idx) * 4)
 #define MVPP2_PRS_TCAM_CTRL_REG			0x1230
 #define     MVPP2_PRS_TCAM_EN_MASK		BIT(0)
+#define MVPP2_PRS_TCAM_HIT_IDX_REG		0x1240
+#define MVPP2_PRS_TCAM_HIT_CNT_REG		0x1244
+#define     MVPP2_PRS_TCAM_HIT_CNT_MASK		GENMASK(15, 0)
 
 /* RSS Registers */
 #define MVPP22_RSS_INDEX			0x1500
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
index e8a242b56519..af8fb93a8ae2 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -192,6 +192,22 @@ static int mvpp2_dbgfs_prs_sram_show(struct seq_file *s, void *unused)
 
 DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_sram);
 
+static int mvpp2_dbgfs_prs_hits_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_prs_entry *entry = s->private;
+	int val;
+
+	val = mvpp2_prs_hits(entry->priv, entry->tid);
+	if (val < 0)
+		return val;
+
+	seq_printf(s, "%d\n", val);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_hits);
+
 static int mvpp2_dbgfs_prs_valid_show(struct seq_file *s, void *unused)
 {
 	struct mvpp2_dbgfs_prs_entry *entry = s->private;
@@ -263,6 +279,9 @@ static int mvpp2_dbgfs_prs_entry_init(struct dentry *parent,
 	debugfs_create_file("header_data", 0644, prs_entry_dir, entry,
 			    &mvpp2_dbgfs_prs_hdata_fops);
 
+	debugfs_create_file("hits", 0444, prs_entry_dir, entry,
+			    &mvpp2_dbgfs_prs_hits_fops);
+
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
index f133d820f0fa..392fd895f278 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.c
@@ -2478,3 +2478,19 @@ int mvpp2_prs_def_flow(struct mvpp2_port *port)
 
 	return 0;
 }
+
+int mvpp2_prs_hits(struct mvpp2 *priv, int index)
+{
+	u32 val;
+
+	if (index > MVPP2_PRS_TCAM_SRAM_SIZE)
+		return -EINVAL;
+
+	mvpp2_write(priv, MVPP2_PRS_TCAM_HIT_IDX_REG, index);
+
+	val = mvpp2_read(priv, MVPP2_PRS_TCAM_HIT_CNT_REG);
+
+	val &= MVPP2_PRS_TCAM_HIT_CNT_MASK;
+
+	return val;
+}
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
index 67b67ccb387d..e22f6c85d380 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_prs.h
@@ -328,4 +328,6 @@ void mvpp2_prs_mac_del_all(struct mvpp2_port *port);
 
 int mvpp2_prs_update_mac_da(struct net_device *dev, const u8 *da);
 
+int mvpp2_prs_hits(struct mvpp2 *priv, int index);
+
 #endif
-- 
2.11.0

[PATCH net-next v2 4/5] net: mvpp2: debugfs: add entries for classifier flows

[Maxime Chevallier]

The classifier configuration for RSS is quite complex, with several
lookup tables being used. This commit adds useful info in debugfs to
see how the different tables are configured :

Added 2 new entries in the per-port directory :

  - .../eth0/default_rxq : The default rx queue on that port
  - .../eth0/rss_enable : Indicates if RSS is enabled in the C2 entry

Added the 'flows' directory :

  It contains one entry per sub-flow. a 'sub-flow' is a unique path from
  Header Parser to the flow table. Multiple sub-flows can point to the
  same 'flow' (each flow has an id from 8 to 29, which is its index in the
  Lookup Id table) :

  - .../flows/00/...
             /01/...
             ...
             /51/id : The flow id. There are 21 unique flows. There's one
                       flow per combination of the following parameters :
                       - L4 protocol (TCP, UDP, none)
                       - L3 protocol (IPv4, IPv6)
                       - L3 parameters (Fragmented or not)
                       - L2 parameters (Vlan tag presence or not)
              .../type : The flow type. This is an even higher level flow,
                         that we manipulate with ethtool. It can be :
                         "udp4" "tcp4" "udp6" "tcp6" "ipv4" "ipv6" "other".
              .../eth0/...
              .../eth1/engine : The hash generation engine used for this
	                        flow on the given port
                  .../hash_opts : The hash generation options indicating on
                                  what data we base the hash (vlan tag, src
                                  IP, src port, etc.)

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
V2 : Make cls_flow_get non static, to use it in mvpp2_debugfs.

 drivers/net/ethernet/marvell/mvpp2/mvpp2.h         |   2 +
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c     |  28 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h     |  15 ++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 289 +++++++++++++++++++++
 4 files changed, 329 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 70b3e9cd0d84..af4968d7c007 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -132,8 +132,10 @@
 #define MVPP22_CLS_C2_ATTR0			0x1b64
 #define     MVPP22_CLS_C2_ATTR0_QHIGH(qh)	(((qh) & 0x1f) << 24)
 #define     MVPP22_CLS_C2_ATTR0_QHIGH_MASK	0x1f
+#define     MVPP22_CLS_C2_ATTR0_QHIGH_OFFS	24
 #define     MVPP22_CLS_C2_ATTR0_QLOW(ql)	(((ql) & 0x7) << 21)
 #define     MVPP22_CLS_C2_ATTR0_QLOW_MASK	0x7
+#define     MVPP22_CLS_C2_ATTR0_QLOW_OFFS	21
 #define MVPP22_CLS_C2_ATTR1			0x1b68
 #define MVPP22_CLS_C2_ATTR2			0x1b6c
 #define     MVPP22_CLS_C2_ATTR2_RSS_EN		BIT(30)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index 125466c66f1a..c5012fa390c8 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -322,8 +322,8 @@ static struct mvpp2_cls_flow cls_flows[MVPP2_N_FLOWS] = {
 		       0, 0),
 };
 
-static void mvpp2_cls_flow_read(struct mvpp2 *priv, int index,
-				struct mvpp2_cls_flow_entry *fe)
+void mvpp2_cls_flow_read(struct mvpp2 *priv, int index,
+			 struct mvpp2_cls_flow_entry *fe)
 {
 	fe->index = index;
 	mvpp2_write(priv, MVPP2_CLS_FLOW_INDEX_REG, index);
@@ -342,6 +342,18 @@ static void mvpp2_cls_flow_write(struct mvpp2 *priv,
 	mvpp2_write(priv, MVPP2_CLS_FLOW_TBL2_REG,  fe->data[2]);
 }
 
+void mvpp2_cls_lookup_read(struct mvpp2 *priv, int lkpid, int way,
+			   struct mvpp2_cls_lookup_entry *le)
+{
+	u32 val;
+
+	val = (way << MVPP2_CLS_LKP_INDEX_WAY_OFFS) | lkpid;
+	mvpp2_write(priv, MVPP2_CLS_LKP_INDEX_REG, val);
+	le->way = way;
+	le->lkpid = lkpid;
+	le->data = mvpp2_read(priv, MVPP2_CLS_LKP_TBL_REG);
+}
+
 /* Update classification lookup table register */
 static void mvpp2_cls_lookup_write(struct mvpp2 *priv,
 				   struct mvpp2_cls_lookup_entry *le)
@@ -388,6 +400,12 @@ static void mvpp2_cls_flow_eng_set(struct mvpp2_cls_flow_entry *fe,
 	fe->data[0] |= MVPP2_CLS_FLOW_TBL0_ENG(engine);
 }
 
+int mvpp2_cls_flow_eng_get(struct mvpp2_cls_flow_entry *fe)
+{
+	return (fe->data[0] >> MVPP2_CLS_FLOW_TBL0_OFFS) &
+		MVPP2_CLS_FLOW_TBL0_ENG_MASK;
+}
+
 static void mvpp2_cls_flow_port_id_sel(struct mvpp2_cls_flow_entry *fe,
 				       bool from_packet)
 {
@@ -554,7 +572,7 @@ static int mvpp2_flow_set_hek_fields(struct mvpp2_cls_flow_entry *fe,
 	return 0;
 }
 
-static struct mvpp2_cls_flow *mvpp2_cls_flow_get(int flow)
+struct mvpp2_cls_flow *mvpp2_cls_flow_get(int flow)
 {
 	if (flow >= MVPP2_N_FLOWS)
 		return NULL;
@@ -725,8 +743,8 @@ static void mvpp2_cls_c2_write(struct mvpp2 *priv,
 	mvpp2_write(priv, MVPP22_CLS_C2_ATTR3, c2->attr[3]);
 }
 
-static void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
-			      struct mvpp2_cls_c2_entry *c2)
+void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
+		       struct mvpp2_cls_c2_entry *c2)
 {
 	mvpp2_write(priv, MVPP22_CLS_C2_TCAM_IDX, index);
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
index e159489a20ea..13eae2d1b4bf 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
@@ -209,4 +209,19 @@ void mvpp2_cls_port_config(struct mvpp2_port *port);
 
 void mvpp2_cls_oversize_rxq_set(struct mvpp2_port *port);
 
+int mvpp2_cls_flow_eng_get(struct mvpp2_cls_flow_entry *fe);
+
+u16 mvpp2_flow_get_hek_fields(struct mvpp2_cls_flow_entry *fe);
+
+struct mvpp2_cls_flow *mvpp2_cls_flow_get(int flow);
+
+void mvpp2_cls_flow_read(struct mvpp2 *priv, int index,
+			 struct mvpp2_cls_flow_entry *fe);
+
+void mvpp2_cls_lookup_read(struct mvpp2 *priv, int lkpid, int way,
+			   struct mvpp2_cls_lookup_entry *le);
+
+void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
+		       struct mvpp2_cls_c2_entry *c2);
+
 #endif
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
index af8fb93a8ae2..fc46ec81249b 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -11,12 +11,207 @@
 
 #include "mvpp2.h"
 #include "mvpp2_prs.h"
+#include "mvpp2_cls.h"
 
 struct mvpp2_dbgfs_prs_entry {
 	int tid;
 	struct mvpp2 *priv;
 };
 
+struct mvpp2_dbgfs_flow_entry {
+	int flow;
+	struct mvpp2 *priv;
+};
+
+struct mvpp2_dbgfs_port_flow_entry {
+	struct mvpp2_port *port;
+	struct mvpp2_dbgfs_flow_entry *dbg_fe;
+};
+
+static int mvpp2_dbgfs_flow_type_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_flow_entry *entry = s->private;
+	struct mvpp2_cls_flow *f;
+	const char *flow_name;
+
+	f = mvpp2_cls_flow_get(entry->flow);
+	if (!f)
+		return -EINVAL;
+
+	switch (f->flow_type) {
+	case IPV4_FLOW:
+		flow_name = "ipv4";
+		break;
+	case IPV6_FLOW:
+		flow_name = "ipv6";
+		break;
+	case TCP_V4_FLOW:
+		flow_name = "tcp4";
+		break;
+	case TCP_V6_FLOW:
+		flow_name = "tcp6";
+		break;
+	case UDP_V4_FLOW:
+		flow_name = "udp4";
+		break;
+	case UDP_V6_FLOW:
+		flow_name = "udp6";
+		break;
+	default:
+		flow_name = "other";
+	}
+
+	seq_printf(s, "%s\n", flow_name);
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_flow_type_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mvpp2_dbgfs_flow_type_show, inode->i_private);
+}
+
+static int mvpp2_dbgfs_flow_type_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct mvpp2_dbgfs_flow_entry *flow_entry = seq->private;
+
+	kfree(flow_entry);
+	return single_release(inode, file);
+}
+
+static const struct file_operations mvpp2_dbgfs_flow_type_fops = {
+	.open = mvpp2_dbgfs_flow_type_open,
+	.read = seq_read,
+	.release = mvpp2_dbgfs_flow_type_release,
+};
+
+static int mvpp2_dbgfs_flow_id_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_flow_entry *entry = s->private;
+	struct mvpp2_cls_flow *f;
+
+	f = mvpp2_cls_flow_get(entry->flow);
+	if (!f)
+		return -EINVAL;
+
+	seq_printf(s, "%d\n", f->flow_id);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_id);
+
+static int mvpp2_dbgfs_port_flow_hash_opt_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_port_flow_entry *entry = s->private;
+	struct mvpp2_port *port = entry->port;
+	struct mvpp2_cls_flow_entry fe;
+	struct mvpp2_cls_flow *f;
+	int flow_index;
+	u16 hash_opts;
+
+	f = mvpp2_cls_flow_get(entry->dbg_fe->flow);
+	if (!f)
+		return -EINVAL;
+
+	flow_index = MVPP2_PORT_FLOW_HASH_ENTRY(entry->port->id, f->flow_id);
+
+	mvpp2_cls_flow_read(port->priv, flow_index, &fe);
+
+	hash_opts = mvpp2_flow_get_hek_fields(&fe);
+
+	seq_printf(s, "0x%04x\n", hash_opts);
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_port_flow_hash_opt_open(struct inode *inode,
+					       struct file *file)
+{
+	return single_open(file, mvpp2_dbgfs_port_flow_hash_opt_show,
+			   inode->i_private);
+}
+
+static int mvpp2_dbgfs_port_flow_hash_opt_release(struct inode *inode,
+						  struct file *file)
+{
+	struct seq_file *seq = file->private_data;
+	struct mvpp2_dbgfs_port_flow_entry *flow_entry = seq->private;
+
+	kfree(flow_entry);
+	return single_release(inode, file);
+}
+
+static const struct file_operations mvpp2_dbgfs_port_flow_hash_opt_fops = {
+	.open = mvpp2_dbgfs_port_flow_hash_opt_open,
+	.read = seq_read,
+	.release = mvpp2_dbgfs_port_flow_hash_opt_release,
+};
+
+static int mvpp2_dbgfs_port_flow_engine_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_port_flow_entry *entry = s->private;
+	struct mvpp2_port *port = entry->port;
+	struct mvpp2_cls_flow_entry fe;
+	struct mvpp2_cls_flow *f;
+	int flow_index, engine;
+
+	f = mvpp2_cls_flow_get(entry->dbg_fe->flow);
+	if (!f)
+		return -EINVAL;
+
+	flow_index = MVPP2_PORT_FLOW_HASH_ENTRY(entry->port->id, f->flow_id);
+
+	mvpp2_cls_flow_read(port->priv, flow_index, &fe);
+
+	engine = mvpp2_cls_flow_eng_get(&fe);
+
+	seq_printf(s, "%d\n", engine);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_flow_engine);
+
+static int mvpp2_dbgfs_flow_c2_rxq_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	struct mvpp2_cls_c2_entry c2;
+	u8 qh, ql;
+
+	mvpp2_cls_c2_read(port->priv, MVPP22_CLS_C2_RSS_ENTRY(port->id), &c2);
+
+	qh = (c2.attr[0] >> MVPP22_CLS_C2_ATTR0_QHIGH_OFFS) &
+	     MVPP22_CLS_C2_ATTR0_QHIGH_MASK;
+
+	ql = (c2.attr[0] >> MVPP22_CLS_C2_ATTR0_QLOW_OFFS) &
+	     MVPP22_CLS_C2_ATTR0_QLOW_MASK;
+
+	seq_printf(s, "%d\n", (qh << 3 | ql));
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_c2_rxq);
+
+static int mvpp2_dbgfs_flow_c2_enable_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	struct mvpp2_cls_c2_entry c2;
+	int enabled;
+
+	mvpp2_cls_c2_read(port->priv, MVPP22_CLS_C2_RSS_ENTRY(port->id), &c2);
+
+	enabled = !!(c2.attr[2] | MVPP22_CLS_C2_ATTR2_RSS_EN);
+
+	seq_printf(s, "%d\n", enabled);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_c2_enable);
+
 static int mvpp2_dbgfs_port_vid_show(struct seq_file *s, void *unused)
 {
 	struct mvpp2_port *port = s->private;
@@ -239,6 +434,90 @@ static const struct file_operations mvpp2_dbgfs_prs_valid_fops = {
 	.release = mvpp2_dbgfs_prs_valid_release,
 };
 
+static int mvpp2_dbgfs_flow_port_init(struct dentry *parent,
+				      struct mvpp2_port *port,
+				      struct mvpp2_dbgfs_flow_entry *entry)
+{
+	struct mvpp2_dbgfs_port_flow_entry *port_entry;
+	struct dentry *port_dir;
+
+	port_dir = debugfs_create_dir(port->dev->name, parent);
+	if (IS_ERR(port_dir))
+		return PTR_ERR(port_dir);
+
+	/* This will be freed by 'hash_opts' release op */
+	port_entry = kmalloc(sizeof(*port_entry), GFP_KERNEL);
+	if (!port_entry)
+		return -ENOMEM;
+
+	port_entry->port = port;
+	port_entry->dbg_fe = entry;
+
+	debugfs_create_file("hash_opts", 0444, port_dir, port_entry,
+			    &mvpp2_dbgfs_port_flow_hash_opt_fops);
+
+	debugfs_create_file("engine", 0444, port_dir, port_entry,
+			    &mvpp2_dbgfs_port_flow_engine_fops);
+
+	return 0;
+}
+
+static int mvpp2_dbgfs_flow_entry_init(struct dentry *parent,
+				       struct mvpp2 *priv, int flow)
+{
+	struct mvpp2_dbgfs_flow_entry *entry;
+	struct dentry *flow_entry_dir;
+	char flow_entry_name[10];
+	int i, ret;
+
+	sprintf(flow_entry_name, "%02d", flow);
+
+	flow_entry_dir = debugfs_create_dir(flow_entry_name, parent);
+	if (!flow_entry_dir)
+		return -ENOMEM;
+
+	/* This will be freed by 'type' release op */
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	entry->flow = flow;
+	entry->priv = priv;
+
+	debugfs_create_file("type", 0444, flow_entry_dir, entry,
+			    &mvpp2_dbgfs_flow_type_fops);
+
+	debugfs_create_file("id", 0444, flow_entry_dir, entry,
+			    &mvpp2_dbgfs_flow_id_fops);
+
+	/* Create entry for each port */
+	for (i = 0; i < priv->port_count; i++) {
+		ret = mvpp2_dbgfs_flow_port_init(flow_entry_dir,
+						 priv->port_list[i], entry);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+static int mvpp2_dbgfs_flow_init(struct dentry *parent, struct mvpp2 *priv)
+{
+	struct dentry *flow_dir;
+	int i, ret;
+
+	flow_dir = debugfs_create_dir("flows", parent);
+	if (!flow_dir)
+		return -ENOMEM;
+
+	for (i = 0; i < MVPP2_N_FLOWS; i++) {
+		ret = mvpp2_dbgfs_flow_entry_init(flow_dir, priv, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int mvpp2_dbgfs_prs_entry_init(struct dentry *parent,
 				      struct mvpp2 *priv, int tid)
 {
@@ -321,6 +600,12 @@ static int mvpp2_dbgfs_port_init(struct dentry *parent,
 	debugfs_create_file("vid_filter", 0444, port_dir, port,
 			    &mvpp2_dbgfs_port_vid_fops);
 
+	debugfs_create_file("default_rxq", 0444, port_dir, port,
+			    &mvpp2_dbgfs_flow_c2_rxq_fops);
+
+	debugfs_create_file("rss_enable", 0444, port_dir, port,
+			    &mvpp2_dbgfs_flow_c2_enable_fops);
+
 	return 0;
 }
 
@@ -357,6 +642,10 @@ void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name)
 			goto err;
 	}
 
+	ret = mvpp2_dbgfs_flow_init(mvpp2_dir, priv);
+	if (ret)
+		goto err;
+
 	return;
 err:
 	mvpp2_dbgfs_cleanup(priv);
-- 
2.11.0

[PATCH net-next v2 5/5] net: mvpp2: debugfs: add classifier hit counters

[Maxime Chevallier]

The classification operations that are used for RSS make use of several
lookup tables. Having hit counters for these tables is really helpful
to determine what flows were matched by ingress traffic, and see the
path of packets among all the classifier tables.

This commit adds hit counters for the 3 tables used at the moment :

 - The decoding table (also called lookup_id table), that links flows
   identified by the Header Parser to the flow table.

   There's one entry per flow, located at :
   .../mvpp2/<controller>/flows/XX/dec_hits

   Note that there are 21 flows in the decoding table, whereas there are
   52 flows in the Header Parser. That's because there are several kind
   of traffic that will match a given flow. Reading the hit counter from
   one sub-flow will clear all hit counter that have the same flow_id.

   This also applies to the flow_hits.

 - The flow table, that contains all the different lookups to be
   performed by the classifier for each packet of a given flow. The match
   is done on the first entry of the flow sequence.

 - The C2 engine entries, that are used to assign the default rx queue,
   and enable or disable RSS for a given port.

   There's one entry per flow, located at:
   .../mvpp2/<controller>/flows/XX/flow_hits

   There is one C2 entry per port, so the c2 hit counter is located at :
   .../mvpp2/<controller>/ethX/c2_hits

All hit counter values are 16-bits clear-on-read values.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h         |  6 +++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c     | 21 +++++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h     |  6 +++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 51 ++++++++++++++++++++++
 4 files changed, 84 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index af4968d7c007..67b9e81b7c02 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -124,6 +124,7 @@
 #define MVPP22_CLS_C2_TCAM_DATA3		0x1b1c
 #define MVPP22_CLS_C2_TCAM_DATA4		0x1b20
 #define     MVPP22_CLS_C2_PORT_ID(port)		((port) << 8)
+#define MVPP22_CLS_C2_HIT_CTR			0x1b50
 #define MVPP22_CLS_C2_ACT			0x1b60
 #define     MVPP22_CLS_C2_ACT_RSS_EN(act)	(((act) & 0x3) << 19)
 #define     MVPP22_CLS_C2_ACT_FWD(act)		(((act) & 0x7) << 13)
@@ -318,6 +319,11 @@
 #define     MVPP22_BM_ADDR_HIGH_VIRT_RLS_MASK	0xff00
 #define     MVPP22_BM_ADDR_HIGH_VIRT_RLS_SHIFT	8
 
+/* Hit counters registers */
+#define MVPP2_CTRS_IDX				0x7040
+#define MVPP2_CLS_DEC_TBL_HIT_CTR		0x7700
+#define MVPP2_CLS_FLOW_TBL_HIT_CTR		0x7704
+
 /* TX Scheduler registers */
 #define MVPP2_TXP_SCHED_PORT_INDEX_REG		0x8000
 #define MVPP2_TXP_SCHED_Q_CMD_REG		0x8004
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
index c5012fa390c8..efdb7a656835 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -322,6 +322,13 @@ static struct mvpp2_cls_flow cls_flows[MVPP2_N_FLOWS] = {
 		       0, 0),
 };
 
+u32 mvpp2_cls_flow_hits(struct mvpp2 *priv, int index)
+{
+	mvpp2_write(priv, MVPP2_CTRS_IDX, index);
+
+	return mvpp2_read(priv, MVPP2_CLS_FLOW_TBL_HIT_CTR);
+}
+
 void mvpp2_cls_flow_read(struct mvpp2 *priv, int index,
 			 struct mvpp2_cls_flow_entry *fe)
 {
@@ -342,6 +349,13 @@ static void mvpp2_cls_flow_write(struct mvpp2 *priv,
 	mvpp2_write(priv, MVPP2_CLS_FLOW_TBL2_REG,  fe->data[2]);
 }
 
+u32 mvpp2_cls_lookup_hits(struct mvpp2 *priv, int index)
+{
+	mvpp2_write(priv, MVPP2_CTRS_IDX, index);
+
+	return mvpp2_read(priv, MVPP2_CLS_DEC_TBL_HIT_CTR);
+}
+
 void mvpp2_cls_lookup_read(struct mvpp2 *priv, int lkpid, int way,
 			   struct mvpp2_cls_lookup_entry *le)
 {
@@ -859,6 +873,13 @@ void mvpp2_cls_port_config(struct mvpp2_port *port)
 	mvpp2_port_c2_cls_init(port);
 }
 
+u32 mvpp2_cls_c2_hit_count(struct mvpp2 *priv, int c2_index)
+{
+	mvpp2_write(priv, MVPP22_CLS_C2_TCAM_IDX, c2_index);
+
+	return mvpp2_read(priv, MVPP22_CLS_C2_HIT_CTR);
+}
+
 static void mvpp2_rss_port_c2_enable(struct mvpp2_port *port)
 {
 	struct mvpp2_cls_c2_entry c2;
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
index 13eae2d1b4bf..089f05f29891 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h
@@ -215,12 +215,18 @@ u16 mvpp2_flow_get_hek_fields(struct mvpp2_cls_flow_entry *fe);
 
 struct mvpp2_cls_flow *mvpp2_cls_flow_get(int flow);
 
+u32 mvpp2_cls_flow_hits(struct mvpp2 *priv, int index);
+
 void mvpp2_cls_flow_read(struct mvpp2 *priv, int index,
 			 struct mvpp2_cls_flow_entry *fe);
 
+u32 mvpp2_cls_lookup_hits(struct mvpp2 *priv, int index);
+
 void mvpp2_cls_lookup_read(struct mvpp2 *priv, int lkpid, int way,
 			   struct mvpp2_cls_lookup_entry *le);
 
+u32 mvpp2_cls_c2_hit_count(struct mvpp2 *priv, int c2_index);
+
 void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
 		       struct mvpp2_cls_c2_entry *c2);
 
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
index fc46ec81249b..02dfef13cccd 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -28,6 +28,33 @@ struct mvpp2_dbgfs_port_flow_entry {
 	struct mvpp2_dbgfs_flow_entry *dbg_fe;
 };
 
+static int mvpp2_dbgfs_flow_flt_hits_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_flow_entry *entry = s->private;
+	int id = MVPP2_FLOW_C2_ENTRY(entry->flow);
+
+	u32 hits = mvpp2_cls_flow_hits(entry->priv, id);
+
+	seq_printf(s, "%u\n", hits);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_flt_hits);
+
+static int mvpp2_dbgfs_flow_dec_hits_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_dbgfs_flow_entry *entry = s->private;
+
+	u32 hits = mvpp2_cls_lookup_hits(entry->priv, entry->flow);
+
+	seq_printf(s, "%u\n", hits);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_dec_hits);
+
 static int mvpp2_dbgfs_flow_type_show(struct seq_file *s, void *unused)
 {
 	struct mvpp2_dbgfs_flow_entry *entry = s->private;
@@ -174,6 +201,21 @@ static int mvpp2_dbgfs_port_flow_engine_show(struct seq_file *s, void *unused)
 
 DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_flow_engine);
 
+static int mvpp2_dbgfs_flow_c2_hits_show(struct seq_file *s, void *unused)
+{
+	struct mvpp2_port *port = s->private;
+	u32 hits;
+
+	hits = mvpp2_cls_c2_hit_count(port->priv,
+				      MVPP22_CLS_C2_RSS_ENTRY(port->id));
+
+	seq_printf(s, "%u\n", hits);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_flow_c2_hits);
+
 static int mvpp2_dbgfs_flow_c2_rxq_show(struct seq_file *s, void *unused)
 {
 	struct mvpp2_port *port = s->private;
@@ -484,6 +526,12 @@ static int mvpp2_dbgfs_flow_entry_init(struct dentry *parent,
 	entry->flow = flow;
 	entry->priv = priv;
 
+	debugfs_create_file("flow_hits", 0444, flow_entry_dir, entry,
+			    &mvpp2_dbgfs_flow_flt_hits_fops);
+
+	debugfs_create_file("dec_hits", 0444, flow_entry_dir, entry,
+			    &mvpp2_dbgfs_flow_dec_hits_fops);
+
 	debugfs_create_file("type", 0444, flow_entry_dir, entry,
 			    &mvpp2_dbgfs_flow_type_fops);
 
@@ -600,6 +648,9 @@ static int mvpp2_dbgfs_port_init(struct dentry *parent,
 	debugfs_create_file("vid_filter", 0444, port_dir, port,
 			    &mvpp2_dbgfs_port_vid_fops);
 
+	debugfs_create_file("c2_hits", 0444, port_dir, port,
+			    &mvpp2_dbgfs_flow_c2_hits_fops);
+
 	debugfs_create_file("default_rxq", 0444, port_dir, port,
 			    &mvpp2_dbgfs_flow_c2_rxq_fops);
 
-- 
2.11.0

Re: [PATCH net-next v2 0/5] net: mvpp2: add debugfs interface

[David Miller]

From: Maxime Chevallier <maxime.chevallier@bootlin.com>
Date: Sat, 14 Jul 2018 13:29:23 +0200

> The PPv2 Header Parser and Classifier are not straightforward to debug,
> having easy access to some of the many lookup tables configuration is
> helpful during development and debug.
> 
> This series adds a basic debugfs interface, allowing to read data from
> the Header Parser and some of the Classifier tables.
> 
> For now, the interface is read-only, and contains only some basic info.
> 
> This was actually used during RSS development, and might be useful to
> troubleshoot some issues we might find.
> 
> The first patch of the series converts the mvpp2 files to SPDX, which
> eases adding the new debugfs dedicated file.
> 
> The second patch adds the interface, and exposes basic Header Parser data.
> 
> The 3rd patch adds a hit counter for the Header Parser TCAM.
> 
> The 4th patch exposes classifier info.
> 
> The 5th patch adds some hit counters for some of the classifier engines.
> 
> Changes since V1:
> - Rebased on the lastest net-next
> - Made cls_flow_get non static so that it can be used in mvpp2_debugfs

Series applied.