net: mvpp2: debugfs: add classifier hit counters

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 51 insertions, 0 deletions

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);