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dsa: mv88x6xxx: Add debugfs interface for statistics

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Allow the contents of the statistics counters to be shown in debugfs.
This is particularly useful for the cpu and dsa ports, which cannot be
seen using ethtools -S.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2015-06-20 18:42:31 +02:00 committed by David S. Miller
parent 80c4627b27
commit 532c7a353f
1 changed files with 59 additions and 0 deletions
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59
drivers/net/dsa/mv88e6xxx.c
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@ -1730,6 +1730,62 @@ static const struct file_operations mv88e6xxx_atu_fops = {
.owner = THIS_MODULE,
};
static void mv88e6xxx_stats_show_header(struct seq_file *s,
struct mv88e6xxx_priv_state *ps)
{
int port;
seq_puts(s, " Statistic ");
for (port = 0 ; port < ps->num_ports; port++)
seq_printf(s, "Port %2d ", port);
seq_puts(s, "\n");
}
static int mv88e6xxx_stats_show(struct seq_file *s, void *p)
{
struct dsa_switch *ds = s->private;
struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
struct mv88e6xxx_hw_stat *stats = mv88e6xxx_hw_stats;
int port, stat, max_stats;
uint64_t value;
if (have_sw_in_discards(ds))
max_stats = ARRAY_SIZE(mv88e6xxx_hw_stats);
else
max_stats = ARRAY_SIZE(mv88e6xxx_hw_stats) - 3;
mv88e6xxx_stats_show_header(s, ps);
mutex_lock(&ps->smi_mutex);
for (stat = 0; stat < max_stats; stat++) {
seq_printf(s, "%19s: ", stats[stat].string);
for (port = 0 ; port < ps->num_ports; port++) {
_mv88e6xxx_stats_snapshot(ds, port);
value = _mv88e6xxx_get_ethtool_stat(ds, stat, stats,
port);
seq_printf(s, "%8llu ", value);
}
seq_puts(s, "\n");
}
mutex_unlock(&ps->smi_mutex);
return 0;
}
static int mv88e6xxx_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, mv88e6xxx_stats_show, inode->i_private);
}
static const struct file_operations mv88e6xxx_stats_fops = {
.open = mv88e6xxx_stats_open,
.read = seq_read,
.llseek = no_llseek,
.release = single_release,
.owner = THIS_MODULE,
};
int mv88e6xxx_setup_common(struct dsa_switch *ds)
{
struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
@ -1753,6 +1809,9 @@ int mv88e6xxx_setup_common(struct dsa_switch *ds)
debugfs_create_file("atu", S_IRUGO, ps->dbgfs, ds,
&mv88e6xxx_atu_fops);
debugfs_create_file("stats", S_IRUGO, ps->dbgfs, ds,
&mv88e6xxx_stats_fops);
return 0;
}