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Subject[PATCH v1 RFC 6/7] Add MIB counter reading support
Date
From: Tristram Ha <Tristram.Ha@microchip.com>

Add MIB counter reading support.
Rename ksz_9477_reg.h to ksz9477_reg.h for consistency as the product
name is always KSZ####.
Header file ksz_priv.h no longer contains any chip specific data.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
---
drivers/net/dsa/microchip/ksz9477.c | 130 ++++++++++++++-------
.../microchip/{ksz_9477_reg.h => ksz9477_reg.h} | 0
drivers/net/dsa/microchip/ksz_common.c | 122 +++++++++++++++++++
drivers/net/dsa/microchip/ksz_common.h | 4 +
drivers/net/dsa/microchip/ksz_priv.h | 8 +-
5 files changed, 219 insertions(+), 45 deletions(-)
rename drivers/net/dsa/microchip/{ksz_9477_reg.h => ksz9477_reg.h} (100%)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 214d380..9579d03 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -31,7 +31,7 @@

#include "ksz_priv.h"
#include "ksz_common.h"
-#include "ksz_9477_reg.h"
+#include "ksz9477_reg.h"

static const struct {
int index;
@@ -272,6 +272,74 @@ static int ksz9477_reset_switch(struct ksz_device *dev)
return 0;
}

+static void ksz9477_r_mib_cnt(struct ksz_device *dev, int port, u16 addr,
+ u64 *cnt)
+{
+ u32 data;
+ int timeout;
+
+ /* retain the flush/freeze bit */
+ ksz_pread32(dev, port, REG_PORT_MIB_CTRL_STAT__4, &data);
+ data &= MIB_COUNTER_FLUSH_FREEZE;
+
+ data |= MIB_COUNTER_READ;
+ data |= (addr << MIB_COUNTER_INDEX_S);
+ ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4, data);
+
+ timeout = 1000;
+ do {
+ ksz_pread32(dev, port, REG_PORT_MIB_CTRL_STAT__4,
+ &data);
+ usleep_range(1, 10);
+ if (!(data & MIB_COUNTER_READ))
+ break;
+ } while (timeout-- > 0);
+
+ /* failed to read MIB. get out of loop */
+ if (!timeout) {
+ dev_dbg(dev->dev, "Failed to get MIB\n");
+ return;
+ }
+
+ /* count resets upon read */
+ ksz_pread32(dev, port, REG_PORT_MIB_DATA, &data);
+ *cnt += data;
+}
+
+static void ksz9477_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
+ u64 *dropped, u64 *cnt)
+{
+ addr = mib_names[addr].index;
+ ksz9477_r_mib_cnt(dev, port, addr, cnt);
+}
+
+static void ksz9477_freeze_mib(struct ksz_device *dev, int port, bool freeze)
+{
+ /* enable the port for flush/freeze function */
+ if (freeze)
+ ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4,
+ MIB_COUNTER_FLUSH_FREEZE);
+ ksz_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, freeze);
+
+ /* disable the port after freeze is done */
+ if (!freeze)
+ ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4, 0);
+}
+
+static void ksz9477_port_init_cnt(struct ksz_device *dev, int port)
+{
+ struct ksz_port_mib *mib = &dev->ports[port].mib;
+
+ /* flush all enabled port MIB counters */
+ ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4,
+ MIB_COUNTER_FLUSH_FREEZE);
+ ksz_write8(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FLUSH);
+ ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4, 0);
+
+ mib->cnt_ptr = 0;
+ memset(mib->counters, 0, dev->mib_cnt * sizeof(u64));
+}
+
static enum dsa_tag_protocol ksz9477_get_tag_protocol(struct dsa_switch *ds)
{
return DSA_TAG_PROTO_KSZ;
@@ -350,46 +418,6 @@ static void ksz9477_get_strings(struct dsa_switch *ds, int port, uint8_t *buf)
}
}

-static void ksz_get_ethtool_stats(struct dsa_switch *ds, int port,
- uint64_t *buf)
-{
- struct ksz_device *dev = ds->priv;
- int i;
- u32 data;
- int timeout;
-
- mutex_lock(&dev->stats_mutex);
-
- for (i = 0; i < TOTAL_SWITCH_COUNTER_NUM; i++) {
- data = MIB_COUNTER_READ;
- data |= ((mib_names[i].index & 0xFF) << MIB_COUNTER_INDEX_S);
- ksz_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4, data);
-
- timeout = 1000;
- do {
- ksz_pread32(dev, port, REG_PORT_MIB_CTRL_STAT__4,
- &data);
- usleep_range(1, 10);
- if (!(data & MIB_COUNTER_READ))
- break;
- } while (timeout-- > 0);
-
- /* failed to read MIB. get out of loop */
- if (!timeout) {
- dev_dbg(dev->dev, "Failed to get MIB\n");
- break;
- }
-
- /* count resets upon read */
- ksz_pread32(dev, port, REG_PORT_MIB_DATA, &data);
-
- dev->mib_value[i] += (uint64_t)data;
- buf[i] = dev->mib_value[i];
- }
-
- mutex_unlock(&dev->stats_mutex);
-}
-
static void ksz9477_cfg_port_member(struct ksz_device *dev, int port,
u8 member)
{
@@ -977,6 +1005,17 @@ static void ksz9477_port_mirror_del(struct dsa_switch *ds, int port,
PORT_MIRROR_SNIFFER, false);
}

+static void ksz9477_phy_setup(struct ksz_device *dev, int port,
+ struct phy_device *phy)
+{
+ if (port < dev->phy_port_cnt) {
+ /* SUPPORTED_Asym_Pause and SUPPORTED_Pause can be removed to
+ * disable flow control when rate limiting is used.
+ */
+ phy->advertising = phy->supported;
+ }
+}
+
static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
{
u8 data8;
@@ -1159,6 +1198,8 @@ static int ksz9477_setup(struct dsa_switch *ds)
/* start switch */
ksz_cfg(dev, REG_SW_OPERATION, SW_START, true);

+ ksz_init_mib_timer(dev);
+
return 0;
}

@@ -1168,6 +1209,7 @@ static int ksz9477_setup(struct dsa_switch *ds)
.set_addr = ksz9477_set_addr,
.phy_read = ksz9477_phy_read16,
.phy_write = ksz9477_phy_write16,
+ .adjust_link = ksz_adjust_link,
.port_enable = ksz_enable_port,
.port_disable = ksz_disable_port,
.get_strings = ksz9477_get_strings,
@@ -1289,6 +1331,7 @@ static int ksz9477_switch_init(struct ksz_device *dev)
if (!dev->ports)
return -ENOMEM;
for (i = 0; i < dev->mib_port_cnt; i++) {
+ mutex_init(&dev->ports[i].mib.cnt_mutex);
dev->ports[i].mib.counters =
devm_kzalloc(dev->dev,
sizeof(u64) *
@@ -1310,7 +1353,12 @@ static void ksz9477_switch_exit(struct ksz_device *dev)
.get_port_addr = ksz9477_get_port_addr,
.cfg_port_member = ksz9477_cfg_port_member,
.flush_dyn_mac_table = ksz9477_flush_dyn_mac_table,
+ .phy_setup = ksz9477_phy_setup,
.port_setup = ksz9477_port_setup,
+ .r_mib_cnt = ksz9477_r_mib_cnt,
+ .r_mib_pkt = ksz9477_r_mib_pkt,
+ .freeze_mib = ksz9477_freeze_mib,
+ .port_init_cnt = ksz9477_port_init_cnt,
.shutdown = ksz9477_reset_switch,
.detect = ksz9477_switch_detect,
.init = ksz9477_switch_init,
diff --git a/drivers/net/dsa/microchip/ksz_9477_reg.h b/drivers/net/dsa/microchip/ksz9477_reg.h
similarity index 100%
rename from drivers/net/dsa/microchip/ksz_9477_reg.h
rename to drivers/net/dsa/microchip/ksz9477_reg.h
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 1c9c4c5..885b3e3 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -50,6 +50,81 @@ void ksz_update_port_member(struct ksz_device *dev, int port)
}
}

+static void port_r_cnt(struct ksz_device *dev, int port)
+{
+ struct ksz_port_mib *mib = &dev->ports[port].mib;
+ u64 *dropped;
+
+ /* Some ports may not have MIB counters before SWITCH_COUNTER_NUM. */
+ while (mib->cnt_ptr < dev->reg_mib_cnt) {
+ dev->dev_ops->r_mib_cnt(dev, port, mib->cnt_ptr,
+ &mib->counters[mib->cnt_ptr]);
+ ++mib->cnt_ptr;
+ }
+
+ /* last one in storage */
+ dropped = &mib->counters[dev->mib_cnt];
+
+ /* Some ports may not have MIB counters after SWITCH_COUNTER_NUM. */
+ while (mib->cnt_ptr < dev->mib_cnt) {
+ dev->dev_ops->r_mib_pkt(dev, port, mib->cnt_ptr,
+ dropped, &mib->counters[mib->cnt_ptr]);
+ ++mib->cnt_ptr;
+ }
+ mib->cnt_ptr = 0;
+}
+
+static void ksz_mib_read_work(struct work_struct *work)
+{
+ struct ksz_device *dev =
+ container_of(work, struct ksz_device, mib_read);
+ struct ksz_port *p;
+ struct ksz_port_mib *mib;
+ int i;
+
+ for (i = 0; i < dev->mib_port_cnt; i++) {
+ p = &dev->ports[i];
+ if (!p->on)
+ continue;
+ mib = &p->mib;
+ mutex_lock(&mib->cnt_mutex);
+
+ /* read only dropped counters when link is not up */
+ if (p->link_down)
+ p->link_down = 0;
+ else if (!p->link_up)
+ mib->cnt_ptr = dev->reg_mib_cnt;
+ port_r_cnt(dev, i);
+ mutex_unlock(&mib->cnt_mutex);
+ }
+}
+
+static void mib_monitor(unsigned long ptr)
+{
+ struct ksz_device *dev = (struct ksz_device *)ptr;
+
+ mod_timer(&dev->mib_read_timer, jiffies + dev->mib_read_interval);
+ schedule_work(&dev->mib_read);
+}
+
+void ksz_init_mib_timer(struct ksz_device *dev)
+{
+ int i;
+
+ /* Read MIB counters every 30 seconds to avoid overflow. */
+ dev->mib_read_interval = msecs_to_jiffies(30000);
+
+ INIT_WORK(&dev->mib_read, ksz_mib_read_work);
+ setup_timer(&dev->mib_read_timer, mib_monitor, (unsigned long)dev);
+
+ for (i = 0; i < dev->mib_port_cnt; i++)
+ dev->dev_ops->port_init_cnt(dev, i);
+
+ /* Start the timer 2 seconds later. */
+ dev->mib_read_timer.expires = jiffies + msecs_to_jiffies(2000);
+ add_timer(&dev->mib_read_timer);
+}
+
int ksz_phy_read16(struct dsa_switch *ds, int addr, int reg)
{
struct ksz_device *dev = ds->priv;
@@ -69,6 +144,25 @@ int ksz_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val)
return 0;
}

+void ksz_adjust_link(struct dsa_switch *ds, int port,
+ struct phy_device *phydev)
+{
+ struct ksz_device *dev = ds->priv;
+ struct ksz_port *p = &dev->ports[port];
+
+ if (phydev->link) {
+ p->speed = phydev->speed;
+ p->duplex = phydev->duplex;
+ p->flow_ctrl = phydev->pause;
+ p->link_up = 1;
+ dev->live_ports |= (1 << port) & dev->on_ports;
+ } else if (p->link_up) {
+ p->link_up = 0;
+ p->link_down = 1;
+ dev->live_ports &= ~(1 << port);
+ }
+}
+
int ksz_sset_count(struct dsa_switch *ds)
{
struct ksz_device *dev = ds->priv;
@@ -76,6 +170,27 @@ int ksz_sset_count(struct dsa_switch *ds)
return dev->mib_cnt;
}

+void ksz_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *buf)
+{
+ struct ksz_device *dev = ds->priv;
+ struct ksz_port_mib *mib;
+
+ mib = &dev->ports[port].mib;
+
+ mutex_lock(&dev->stats_mutex);
+
+ /* freeze MIB counters if supported */
+ if (dev->dev_ops->freeze_mib)
+ dev->dev_ops->freeze_mib(dev, port, true);
+ mutex_lock(&mib->cnt_mutex);
+ port_r_cnt(dev, port);
+ mutex_unlock(&mib->cnt_mutex);
+ if (dev->dev_ops->freeze_mib)
+ dev->dev_ops->freeze_mib(dev, port, false);
+ memcpy(buf, mib->counters, dev->mib_cnt * sizeof(u64));
+ mutex_unlock(&dev->stats_mutex);
+}
+
int ksz_port_bridge_join(struct dsa_switch *ds, int port,
struct net_device *br)
{
@@ -249,6 +364,7 @@ int ksz_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)

/* setup slave port */
dev->dev_ops->port_setup(dev, port, false);
+ dev->dev_ops->phy_setup(dev, port, phy);

/* port_stp_state_set() will be called after to enable the port so
* there is no need to do anything.
@@ -331,6 +447,12 @@ int ksz_switch_register(struct ksz_device *dev,

void ksz_switch_remove(struct ksz_device *dev)
{
+ /* timer started */
+ if (dev->mib_read_timer.expires) {
+ del_timer_sync(&dev->mib_read_timer);
+ flush_work(&dev->mib_read);
+ }
+
dev->dev_ops->exit(dev);
dsa_unregister_switch(dev->ds);
}
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 1c1cbad..20afea3f 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -21,12 +21,16 @@
#define __KSZ_COMMON_H

void ksz_update_port_member(struct ksz_device *dev, int port);
+void ksz_init_mib_timer(struct ksz_device *dev);

/* Common DSA access functions */

int ksz_phy_read16(struct dsa_switch *ds, int addr, int reg);
int ksz_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val);
+void ksz_adjust_link(struct dsa_switch *ds, int port,
+ struct phy_device *phydev);
int ksz_sset_count(struct dsa_switch *ds);
+void ksz_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *buf);
int ksz_port_bridge_join(struct dsa_switch *ds, int port,
struct net_device *br);
void ksz_port_bridge_leave(struct dsa_switch *ds, int port,
diff --git a/drivers/net/dsa/microchip/ksz_priv.h b/drivers/net/dsa/microchip/ksz_priv.h
index 4126749..0e1ccd3 100644
--- a/drivers/net/dsa/microchip/ksz_priv.h
+++ b/drivers/net/dsa/microchip/ksz_priv.h
@@ -26,8 +26,6 @@
#include <linux/etherdevice.h>
#include <net/dsa.h>

-#include "ksz_9477_reg.h"
-
struct ksz_io_ops;

struct vlan_table {
@@ -35,6 +33,7 @@ struct vlan_table {
};

struct ksz_port_mib {
+ struct mutex cnt_mutex; /* structure access */
u8 cnt_ptr;
u64 *counters;
};
@@ -92,8 +91,6 @@ struct ksz_device {

struct vlan_table *vlan_cache;

- u64 mib_value[TOTAL_SWITCH_COUNTER_NUM];
-
u8 *txbuf;

struct ksz_port *ports;
@@ -150,6 +147,8 @@ struct ksz_dev_ops {
u32 (*get_port_addr)(int port, int offset);
void (*cfg_port_member)(struct ksz_device *dev, int port, u8 member);
void (*flush_dyn_mac_table)(struct ksz_device *dev, int port);
+ void (*phy_setup)(struct ksz_device *dev, int port,
+ struct phy_device *phy);
void (*port_setup)(struct ksz_device *dev, int port, bool cpu_port);
void (*r_phy)(struct ksz_device *dev, u16 phy, u16 reg, u16 *val);
void (*w_phy)(struct ksz_device *dev, u16 phy, u16 reg, u16 val);
@@ -164,6 +163,7 @@ struct ksz_dev_ops {
u64 *cnt);
void (*r_mib_pkt)(struct ksz_device *dev, int port, u16 addr,
u64 *dropped, u64 *cnt);
+ void (*freeze_mib)(struct ksz_device *dev, int port, bool freeze);
void (*port_init_cnt)(struct ksz_device *dev, int port);
int (*shutdown)(struct ksz_device *dev);
int (*detect)(struct ksz_device *dev);
--
1.9.1
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