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sfpdiag.c
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sfpdiag.c
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/*
* sfpdiag.c: Implements SFF-8472 optics diagnostics.
*
* Aurelien Guillaume <[email protected]> (C) 2012
* This implementation is loosely based on DOM patches
* from Robert Olsson <[email protected]> (C) 2009
* and SFF-8472 specs (ftp://ftp.seagate.com/pub/sff/SFF-8472.PDF)
* by SFF Committee.
*/
#include <stdio.h>
#include <math.h>
#include <arpa/inet.h>
#include "internal.h"
/* Offsets in decimal, for direct comparison with the SFF specs */
/* A0-based EEPROM offsets for DOM support checks */
#define SFF_A0_DOM 92
#define SFF_A0_OPTIONS 93
#define SFF_A0_COMP 94
/* EEPROM bit values for various registers */
#define SFF_A0_DOM_EXTCAL (1 << 4)
#define SFF_A0_DOM_INTCAL (1 << 5)
#define SFF_A0_DOM_IMPL (1 << 6)
#define SFF_A0_DOM_PWRT (1 << 3)
#define SFF_A0_OPTIONS_AW (1 << 7)
/*
* See ethtool.c comments about SFF-8472, this is the offset
* at which the A2 page is in the EEPROM blob returned by the
* kernel.
*/
#define SFF_A2_BASE 0x100
/* A2-based offsets for DOM */
#define SFF_A2_TEMP 96
#define SFF_A2_TEMP_HALRM 0
#define SFF_A2_TEMP_LALRM 2
#define SFF_A2_TEMP_HWARN 4
#define SFF_A2_TEMP_LWARN 6
#define SFF_A2_VCC 98
#define SFF_A2_VCC_HALRM 8
#define SFF_A2_VCC_LALRM 10
#define SFF_A2_VCC_HWARN 12
#define SFF_A2_VCC_LWARN 14
#define SFF_A2_BIAS 100
#define SFF_A2_BIAS_HALRM 16
#define SFF_A2_BIAS_LALRM 18
#define SFF_A2_BIAS_HWARN 20
#define SFF_A2_BIAS_LWARN 22
#define SFF_A2_TX_PWR 102
#define SFF_A2_TX_PWR_HALRM 24
#define SFF_A2_TX_PWR_LALRM 26
#define SFF_A2_TX_PWR_HWARN 28
#define SFF_A2_TX_PWR_LWARN 30
#define SFF_A2_RX_PWR 104
#define SFF_A2_RX_PWR_HALRM 32
#define SFF_A2_RX_PWR_LALRM 34
#define SFF_A2_RX_PWR_HWARN 36
#define SFF_A2_RX_PWR_LWARN 38
#define SFF_A2_ALRM_FLG 112
#define SFF_A2_WARN_FLG 116
/* 32-bit little-endian calibration constants */
#define SFF_A2_CAL_RXPWR4 56
#define SFF_A2_CAL_RXPWR3 60
#define SFF_A2_CAL_RXPWR2 64
#define SFF_A2_CAL_RXPWR1 68
#define SFF_A2_CAL_RXPWR0 72
/* 16-bit little endian calibration constants */
#define SFF_A2_CAL_TXI_SLP 76
#define SFF_A2_CAL_TXI_OFF 78
#define SFF_A2_CAL_TXPWR_SLP 80
#define SFF_A2_CAL_TXPWR_OFF 82
#define SFF_A2_CAL_T_SLP 84
#define SFF_A2_CAL_T_OFF 86
#define SFF_A2_CAL_V_SLP 88
#define SFF_A2_CAL_V_OFF 90
struct sff8472_diags {
#define MCURR 0
#define LWARN 1
#define HWARN 2
#define LALRM 3
#define HALRM 4
/* [5] tables are current, low/high warn, low/high alarm */
__u8 supports_dom; /* Supports DOM */
__u8 supports_alarms; /* Supports alarm/warning thold */
__u8 calibrated_ext; /* Is externally calibrated */
__u16 bias_cur[5]; /* Measured bias current in 2uA units */
__u16 tx_power[5]; /* Measured TX Power in 0.1uW units */
__u16 rx_power[5]; /* Measured RX Power */
__u8 rx_power_type; /* 0 = OMA, 1 = Average power */
__s16 sfp_temp[5]; /* SFP Temp in 16-bit signed 1/256 Celsius */
__u16 sfp_voltage[5]; /* SFP voltage in 0.1mV units */
};
static struct sff8472_aw_flags {
const char *str; /* Human-readable string, null at the end */
int offset; /* A2-relative address offset */
__u8 value; /* Alarm is on if (offset & value) != 0. */
} sff8472_aw_flags[] = {
{ "Laser bias current high alarm", SFF_A2_ALRM_FLG, (1 << 3) },
{ "Laser bias current low alarm", SFF_A2_ALRM_FLG, (1 << 2) },
{ "Laser bias current high warning", SFF_A2_WARN_FLG, (1 << 3) },
{ "Laser bias current low warning", SFF_A2_WARN_FLG, (1 << 2) },
{ "Laser output power high alarm", SFF_A2_ALRM_FLG, (1 << 1) },
{ "Laser output power low alarm", SFF_A2_ALRM_FLG, (1 << 0) },
{ "Laser output power high warning", SFF_A2_WARN_FLG, (1 << 1) },
{ "Laser output power low warning", SFF_A2_WARN_FLG, (1 << 0) },
{ "Module temperature high alarm", SFF_A2_ALRM_FLG, (1 << 7) },
{ "Module temperature low alarm", SFF_A2_ALRM_FLG, (1 << 6) },
{ "Module temperature high warning", SFF_A2_WARN_FLG, (1 << 7) },
{ "Module temperature low warning", SFF_A2_WARN_FLG, (1 << 6) },
{ "Module voltage high alarm", SFF_A2_ALRM_FLG, (1 << 5) },
{ "Module voltage low alarm", SFF_A2_ALRM_FLG, (1 << 4) },
{ "Module voltage high warning", SFF_A2_WARN_FLG, (1 << 5) },
{ "Module voltage low warning", SFF_A2_WARN_FLG, (1 << 4) },
{ "Laser rx power high alarm", SFF_A2_ALRM_FLG + 1, (1 << 7) },
{ "Laser rx power low alarm", SFF_A2_ALRM_FLG + 1, (1 << 6) },
{ "Laser rx power high warning", SFF_A2_WARN_FLG + 1, (1 << 7) },
{ "Laser rx power low warning", SFF_A2_WARN_FLG + 1, (1 << 6) },
{ NULL, 0, 0 },
};
static double convert_mw_to_dbm(double mw)
{
return (10. * log10(mw / 1000.)) + 30.;
}
/* Most common case: 16-bit unsigned integer in a certain unit */
#define A2_OFFSET_TO_U16(offset) \
(id[SFF_A2_BASE + (offset)] << 8 | id[SFF_A2_BASE + (offset) + 1])
/* Calibration slope is a number between 0.0 included and 256.0 excluded. */
#define A2_OFFSET_TO_SLP(offset) \
(id[SFF_A2_BASE + (offset)] + id[SFF_A2_BASE + (offset) + 1] / 256.)
/* Calibration offset is an integer from -32768 to 32767 */
#define A2_OFFSET_TO_OFF(offset) \
((__s16)A2_OFFSET_TO_U16(offset))
/* RXPWR(x) are IEEE-754 floating point numbers in big-endian format */
#define A2_OFFSET_TO_RXPWRx(offset) \
(befloattoh((__u32 *)(id + SFF_A2_BASE + (offset))))
/*
* 2-byte internal temperature conversions:
* First byte is a signed 8-bit integer, which is the temp decimal part
* Second byte are 1/256th of degree, which are added to the dec part.
*/
#define A2_OFFSET_TO_TEMP(offset) ((__s16)A2_OFFSET_TO_U16(offset))
static void sff8472_dom_parse(const __u8 *id, struct sff8472_diags *sd)
{
sd->bias_cur[MCURR] = A2_OFFSET_TO_U16(SFF_A2_BIAS);
sd->bias_cur[HALRM] = A2_OFFSET_TO_U16(SFF_A2_BIAS_HALRM);
sd->bias_cur[LALRM] = A2_OFFSET_TO_U16(SFF_A2_BIAS_LALRM);
sd->bias_cur[HWARN] = A2_OFFSET_TO_U16(SFF_A2_BIAS_HWARN);
sd->bias_cur[LWARN] = A2_OFFSET_TO_U16(SFF_A2_BIAS_LWARN);
sd->sfp_voltage[MCURR] = A2_OFFSET_TO_U16(SFF_A2_VCC);
sd->sfp_voltage[HALRM] = A2_OFFSET_TO_U16(SFF_A2_VCC_HALRM);
sd->sfp_voltage[LALRM] = A2_OFFSET_TO_U16(SFF_A2_VCC_LALRM);
sd->sfp_voltage[HWARN] = A2_OFFSET_TO_U16(SFF_A2_VCC_HWARN);
sd->sfp_voltage[LWARN] = A2_OFFSET_TO_U16(SFF_A2_VCC_LWARN);
sd->tx_power[MCURR] = A2_OFFSET_TO_U16(SFF_A2_TX_PWR);
sd->tx_power[HALRM] = A2_OFFSET_TO_U16(SFF_A2_TX_PWR_HALRM);
sd->tx_power[LALRM] = A2_OFFSET_TO_U16(SFF_A2_TX_PWR_LALRM);
sd->tx_power[HWARN] = A2_OFFSET_TO_U16(SFF_A2_TX_PWR_HWARN);
sd->tx_power[LWARN] = A2_OFFSET_TO_U16(SFF_A2_TX_PWR_LWARN);
sd->rx_power[MCURR] = A2_OFFSET_TO_U16(SFF_A2_RX_PWR);
sd->rx_power[HALRM] = A2_OFFSET_TO_U16(SFF_A2_RX_PWR_HALRM);
sd->rx_power[LALRM] = A2_OFFSET_TO_U16(SFF_A2_RX_PWR_LALRM);
sd->rx_power[HWARN] = A2_OFFSET_TO_U16(SFF_A2_RX_PWR_HWARN);
sd->rx_power[LWARN] = A2_OFFSET_TO_U16(SFF_A2_RX_PWR_LWARN);
sd->sfp_temp[MCURR] = A2_OFFSET_TO_TEMP(SFF_A2_TEMP);
sd->sfp_temp[HALRM] = A2_OFFSET_TO_TEMP(SFF_A2_TEMP_HALRM);
sd->sfp_temp[LALRM] = A2_OFFSET_TO_TEMP(SFF_A2_TEMP_LALRM);
sd->sfp_temp[HWARN] = A2_OFFSET_TO_TEMP(SFF_A2_TEMP_HWARN);
sd->sfp_temp[LWARN] = A2_OFFSET_TO_TEMP(SFF_A2_TEMP_LWARN);
}
/* Converts to a float from a big-endian 4-byte source buffer. */
static float befloattoh(const __u32 *source)
{
union {
__u32 src;
float dst;
} converter;
converter.src = ntohl(*source);
return converter.dst;
}
static void sff8472_calibration(const __u8 *id, struct sff8472_diags *sd)
{
int i;
__u16 rx_reading;
/* Calibration should occur for all values (threshold and current) */
for (i = 0; i < ARRAY_SIZE(sd->bias_cur); ++i) {
/*
* Apply calibration formula 1 (Temp., Voltage, Bias, Tx Power)
*/
sd->bias_cur[i] *= A2_OFFSET_TO_SLP(SFF_A2_CAL_TXI_SLP);
sd->tx_power[i] *= A2_OFFSET_TO_SLP(SFF_A2_CAL_TXPWR_SLP);
sd->sfp_voltage[i] *= A2_OFFSET_TO_SLP(SFF_A2_CAL_V_SLP);
sd->sfp_temp[i] *= A2_OFFSET_TO_SLP(SFF_A2_CAL_T_SLP);
sd->bias_cur[i] += A2_OFFSET_TO_OFF(SFF_A2_CAL_TXI_OFF);
sd->tx_power[i] += A2_OFFSET_TO_OFF(SFF_A2_CAL_TXPWR_OFF);
sd->sfp_voltage[i] += A2_OFFSET_TO_OFF(SFF_A2_CAL_V_OFF);
sd->sfp_temp[i] += A2_OFFSET_TO_OFF(SFF_A2_CAL_T_OFF);
/*
* Apply calibration formula 2 (Rx Power only)
*/
rx_reading = sd->rx_power[i];
sd->rx_power[i] = A2_OFFSET_TO_RXPWRx(SFF_A2_CAL_RXPWR0);
sd->rx_power[i] += rx_reading *
A2_OFFSET_TO_RXPWRx(SFF_A2_CAL_RXPWR1);
sd->rx_power[i] += rx_reading *
A2_OFFSET_TO_RXPWRx(SFF_A2_CAL_RXPWR2);
sd->rx_power[i] += rx_reading *
A2_OFFSET_TO_RXPWRx(SFF_A2_CAL_RXPWR3);
}
}
static void sff8472_parse_eeprom(const __u8 *id, struct sff8472_diags *sd)
{
sd->supports_dom = id[SFF_A0_DOM] & SFF_A0_DOM_IMPL;
sd->supports_alarms = id[SFF_A0_OPTIONS] & SFF_A0_OPTIONS_AW;
sd->calibrated_ext = id[SFF_A0_DOM] & SFF_A0_DOM_EXTCAL;
sd->rx_power_type = id[SFF_A0_DOM] & SFF_A0_DOM_PWRT;
sff8472_dom_parse(id, sd);
/*
* If the SFP is externally calibrated, we need to read calibration data
* and compensate the already stored readings.
*/
if (sd->calibrated_ext)
sff8472_calibration(id, sd);
}
void sff8472_show_all(const __u8 *id)
{
struct sff8472_diags sd;
char *rx_power_string = NULL;
int i;
sff8472_parse_eeprom(id, &sd);
if (!sd.supports_dom) {
printf("\t%-41s : No\n", "Optical diagnostics support");
return ;
}
printf("\t%-41s : Yes\n", "Optical diagnostics support");
#define PRINT_BIAS(string, index) \
printf("\t%-41s : %.3f mA\n", (string), \
(double)(sd.bias_cur[(index)] / 500.))
# define PRINT_xX_PWR(string, var, index) \
printf("\t%-41s : %.4f mW / %.2f dBm\n", (string), \
(double)((var)[(index)] / 10000.), \
convert_mw_to_dbm((double)((var)[(index)] / 10000.)))
#define PRINT_TEMP(string, index) \
printf("\t%-41s : %.2f degrees C / %.2f degrees F\n", (string), \
(double)(sd.sfp_temp[(index)] / 256.), \
(double)(sd.sfp_temp[(index)] / 256. * 1.8 + 32.))
#define PRINT_VCC(string, index) \
printf("\t%-41s : %.4f V\n", (string), \
(double)(sd.sfp_voltage[(index)] / 10000.))
PRINT_BIAS("Laser bias current", MCURR);
PRINT_xX_PWR("Laser output power", sd.tx_power, MCURR);
if (!sd.rx_power_type)
rx_power_string = "Receiver signal OMA";
else
rx_power_string = "Receiver signal average optical power";
PRINT_xX_PWR(rx_power_string, sd.rx_power, MCURR);
PRINT_TEMP("Module temperature", MCURR);
PRINT_VCC("Module voltage", MCURR);
printf("\t%-41s : %s\n", "Alarm/warning flags implemented",
(sd.supports_alarms ? "Yes" : "No"));
if (sd.supports_alarms) {
for (i = 0; sff8472_aw_flags[i].str; ++i) {
printf("\t%-41s : %s\n", sff8472_aw_flags[i].str,
id[SFF_A2_BASE + sff8472_aw_flags[i].offset]
& sff8472_aw_flags[i].value ? "On" : "Off");
}
PRINT_BIAS("Laser bias current high alarm threshold", HALRM);
PRINT_BIAS("Laser bias current low alarm threshold", LALRM);
PRINT_BIAS("Laser bias current high warning threshold", HWARN);
PRINT_BIAS("Laser bias current low warning threshold", LWARN);
PRINT_xX_PWR("Laser output power high alarm threshold",
sd.tx_power, HALRM);
PRINT_xX_PWR("Laser output power low alarm threshold",
sd.tx_power, LALRM);
PRINT_xX_PWR("Laser output power high warning threshold",
sd.tx_power, HWARN);
PRINT_xX_PWR("Laser output power low warning threshold",
sd.tx_power, LWARN);
PRINT_TEMP("Module temperature high alarm threshold", HALRM);
PRINT_TEMP("Module temperature low alarm threshold", LALRM);
PRINT_TEMP("Module temperature high warning threshold", HWARN);
PRINT_TEMP("Module temperature low warning threshold", LWARN);
PRINT_VCC("Module voltage high alarm threshold", HALRM);
PRINT_VCC("Module voltage low alarm threshold", LALRM);
PRINT_VCC("Module voltage high warning threshold", HWARN);
PRINT_VCC("Module voltage low warning threshold", LWARN);
PRINT_xX_PWR("Laser rx power high alarm threshold",
sd.rx_power, HALRM);
PRINT_xX_PWR("Laser rx power low alarm threshold",
sd.rx_power, LALRM);
PRINT_xX_PWR("Laser rx power high warning threshold",
sd.rx_power, HWARN);
PRINT_xX_PWR("Laser rx power low warning threshold",
sd.rx_power, LWARN);
}
}