Commit 1203341c authored by Maxime Chevallier's avatar Maxime Chevallier Committed by David S. Miller

net: mvpp2: debugfs: add hit counter stats for Header Parser entries

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: default avatarMaxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 21da57a2
......@@ -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
......
......@@ -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;
}
......
......@@ -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;
}
......@@ -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
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