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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/* Statistics for Ocelot switch family
*
* Copyright (c) 2017 Microsemi Corporation
*/
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include "ocelot.h"
/* Read the counters from hardware and keep them in region->buf.
* Caller must hold &ocelot->stat_view_lock.
*/
static int ocelot_port_update_stats(struct ocelot *ocelot, int port)
{
struct ocelot_stats_region *region;
int err;
/* Configure the port to read the stats from */
ocelot_write(ocelot, SYS_STAT_CFG_STAT_VIEW(port), SYS_STAT_CFG);
list_for_each_entry(region, &ocelot->stats_regions, node) {
err = ocelot_bulk_read(ocelot, region->base, region->buf,
region->count);
if (err)
return err;
}
return 0;
}
/* Transfer the counters from region->buf to ocelot->stats.
* Caller must hold &ocelot->stat_view_lock and &ocelot->stats_lock.
*/
static void ocelot_port_transfer_stats(struct ocelot *ocelot, int port)
{
unsigned int idx = port * OCELOT_NUM_STATS;
struct ocelot_stats_region *region;
int j;
list_for_each_entry(region, &ocelot->stats_regions, node) {
for (j = 0; j < region->count; j++) {
u64 *stat = &ocelot->stats[idx + j];
u64 val = region->buf[j];
if (val < (*stat & U32_MAX))
*stat += (u64)1 << 32;
*stat = (*stat & ~(u64)U32_MAX) + val;
}
idx += region->count;
}
}
static void ocelot_check_stats_work(struct work_struct *work)
{
struct delayed_work *del_work = to_delayed_work(work);
struct ocelot *ocelot = container_of(del_work, struct ocelot,
stats_work);
int port, err;
mutex_lock(&ocelot->stat_view_lock);
for (port = 0; port < ocelot->num_phys_ports; port++) {
err = ocelot_port_update_stats(ocelot, port);
if (err)
break;
spin_lock(&ocelot->stats_lock);
ocelot_port_transfer_stats(ocelot, port);
spin_unlock(&ocelot->stats_lock);
}
if (!err && ocelot->ops->update_stats)
ocelot->ops->update_stats(ocelot);
mutex_unlock(&ocelot->stat_view_lock);
if (err)
dev_err(ocelot->dev, "Error %d updating ethtool stats\n", err);
queue_delayed_work(ocelot->stats_queue, &ocelot->stats_work,
OCELOT_STATS_CHECK_DELAY);
}
void ocelot_get_strings(struct ocelot *ocelot, int port, u32 sset, u8 *data)
{
int i;
if (sset != ETH_SS_STATS)
return;
for (i = 0; i < OCELOT_NUM_STATS; i++) {
if (ocelot->stats_layout[i].name[0] == '\0')
continue;
memcpy(data + i * ETH_GSTRING_LEN, ocelot->stats_layout[i].name,
ETH_GSTRING_LEN);
}
}
EXPORT_SYMBOL(ocelot_get_strings);
void ocelot_get_ethtool_stats(struct ocelot *ocelot, int port, u64 *data)
{
int i, err;
mutex_lock(&ocelot->stat_view_lock);
/* check and update now */
err = ocelot_port_update_stats(ocelot, port);
spin_lock(&ocelot->stats_lock);
ocelot_port_transfer_stats(ocelot, port);
/* Copy all supported counters */
for (i = 0; i < OCELOT_NUM_STATS; i++) {
int index = port * OCELOT_NUM_STATS + i;
if (ocelot->stats_layout[i].name[0] == '\0')
continue;
*data++ = ocelot->stats[index];
}
spin_unlock(&ocelot->stats_lock);
mutex_unlock(&ocelot->stat_view_lock);
if (err)
dev_err(ocelot->dev, "Error %d updating ethtool stats\n", err);
}
EXPORT_SYMBOL(ocelot_get_ethtool_stats);
int ocelot_get_sset_count(struct ocelot *ocelot, int port, int sset)
{
int i, num_stats = 0;
if (sset != ETH_SS_STATS)
return -EOPNOTSUPP;
for (i = 0; i < OCELOT_NUM_STATS; i++)
if (ocelot->stats_layout[i].name[0] != '\0')
num_stats++;
return num_stats;
}
EXPORT_SYMBOL(ocelot_get_sset_count);
static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
{
struct ocelot_stats_region *region = NULL;
unsigned int last;
int i;
INIT_LIST_HEAD(&ocelot->stats_regions);
for (i = 0; i < OCELOT_NUM_STATS; i++) {
if (ocelot->stats_layout[i].name[0] == '\0')
continue;
if (region && ocelot->stats_layout[i].reg == last + 4) {
region->count++;
} else {
region = devm_kzalloc(ocelot->dev, sizeof(*region),
GFP_KERNEL);
if (!region)
return -ENOMEM;
region->base = ocelot->stats_layout[i].reg;
region->count = 1;
list_add_tail(®ion->node, &ocelot->stats_regions);
}
last = ocelot->stats_layout[i].reg;
}
list_for_each_entry(region, &ocelot->stats_regions, node) {
region->buf = devm_kcalloc(ocelot->dev, region->count,
sizeof(*region->buf), GFP_KERNEL);
if (!region->buf)
return -ENOMEM;
}
return 0;
}
int ocelot_stats_init(struct ocelot *ocelot)
{
char queue_name[32];
int ret;
ocelot->stats = devm_kcalloc(ocelot->dev,
ocelot->num_phys_ports * OCELOT_NUM_STATS,
sizeof(u64), GFP_KERNEL);
if (!ocelot->stats)
return -ENOMEM;
snprintf(queue_name, sizeof(queue_name), "%s-stats",
dev_name(ocelot->dev));
ocelot->stats_queue = create_singlethread_workqueue(queue_name);
if (!ocelot->stats_queue)
return -ENOMEM;
spin_lock_init(&ocelot->stats_lock);
mutex_init(&ocelot->stat_view_lock);
ret = ocelot_prepare_stats_regions(ocelot);
if (ret) {
destroy_workqueue(ocelot->stats_queue);
return ret;
}
INIT_DELAYED_WORK(&ocelot->stats_work, ocelot_check_stats_work);
queue_delayed_work(ocelot->stats_queue, &ocelot->stats_work,
OCELOT_STATS_CHECK_DELAY);
return 0;
}
void ocelot_stats_deinit(struct ocelot *ocelot)
{
cancel_delayed_work(&ocelot->stats_work);
destroy_workqueue(ocelot->stats_queue);
}
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