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net: phy: broadcom: Add support code for reading PHY counters

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Broadcom PHYs expose a number of PHY error counters: receive errors,
false carrier sense, SerDes BER count, local and remote receive errors.
Add support code to allow retrieving these error counters. Since the
Broadcom PHY library code is used by several drivers, make it possible
for them to specify the storage for the software copy of the statistics.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2016-11-29 09:57:17 -08:00 committed by David S. Miller
parent 5a6681e22c
commit 820ee17b8d
3 changed files with 78 additions and 0 deletions
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70
drivers/net/phy/bcm-phy-lib.c
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@ -17,6 +17,7 @@
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/ethtool.h>
#define MII_BCM_CHANNEL_WIDTH 0x2000
#define BCM_CL45VEN_EEE_ADV 0x3c
@ -317,6 +318,75 @@ int bcm_phy_downshift_set(struct phy_device *phydev, u8 count)
}
EXPORT_SYMBOL_GPL(bcm_phy_downshift_set);
struct bcm_phy_hw_stat {
const char *string;
u8 reg;
u8 shift;
u8 bits;
};
/* Counters freeze at either 0xffff or 0xff, better than nothing */
static const struct bcm_phy_hw_stat bcm_phy_hw_stats[] = {
{ "phy_receive_errors", MII_BRCM_CORE_BASE12, 0, 16 },
{ "phy_serdes_ber_errors", MII_BRCM_CORE_BASE13, 8, 8 },
{ "phy_false_carrier_sense_errors", MII_BRCM_CORE_BASE13, 0, 8 },
{ "phy_local_rcvr_nok", MII_BRCM_CORE_BASE14, 8, 8 },
{ "phy_remote_rcv_nok", MII_BRCM_CORE_BASE14, 0, 8 },
};
int bcm_phy_get_sset_count(struct phy_device *phydev)
{
return ARRAY_SIZE(bcm_phy_hw_stats);
}
EXPORT_SYMBOL_GPL(bcm_phy_get_sset_count);
void bcm_phy_get_strings(struct phy_device *phydev, u8 *data)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(bcm_phy_hw_stats); i++)
memcpy(data + i * ETH_GSTRING_LEN,
bcm_phy_hw_stats[i].string, ETH_GSTRING_LEN);
}
EXPORT_SYMBOL_GPL(bcm_phy_get_strings);
#ifndef UINT64_MAX
#define UINT64_MAX (u64)(~((u64)0))
#endif
/* Caller is supposed to provide appropriate storage for the library code to
* access the shadow copy
*/
static u64 bcm_phy_get_stat(struct phy_device *phydev, u64 *shadow,
unsigned int i)
{
struct bcm_phy_hw_stat stat = bcm_phy_hw_stats[i];
int val;
u64 ret;
val = phy_read(phydev, stat.reg);
if (val < 0) {
ret = UINT64_MAX;
} else {
val >>= stat.shift;
val = val & ((1 << stat.bits) - 1);
shadow[i] += val;
ret = shadow[i];
}
return ret;
}
void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
struct ethtool_stats *stats, u64 *data)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(bcm_phy_hw_stats); i++)
data[i] = bcm_phy_get_stat(phydev, shadow, i);
}
EXPORT_SYMBOL_GPL(bcm_phy_get_stats);
MODULE_DESCRIPTION("Broadcom PHY Library");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Broadcom Corporation");

5
drivers/net/phy/bcm-phy-lib.h
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@ -42,4 +42,9 @@ int bcm_phy_downshift_get(struct phy_device *phydev, u8 *count);
int bcm_phy_downshift_set(struct phy_device *phydev, u8 count);
int bcm_phy_get_sset_count(struct phy_device *phydev);
void bcm_phy_get_strings(struct phy_device *phydev, u8 *data);
void bcm_phy_get_stats(struct phy_device *phydev, u64 *shadow,
struct ethtool_stats *stats, u64 *data);
#endif /* _LINUX_BCM_PHY_LIB_H */

3
include/linux/brcmphy.h
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@ -244,6 +244,9 @@
#define LPI_FEATURE_EN_DIG1000X 0x4000
/* Core register definitions*/
#define MII_BRCM_CORE_BASE12 0x12
#define MII_BRCM_CORE_BASE13 0x13
#define MII_BRCM_CORE_BASE14 0x14
#define MII_BRCM_CORE_BASE1E 0x1E
#define MII_BRCM_CORE_EXPB0 0xB0
#define MII_BRCM_CORE_EXPB1 0xB1