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sbl_link.c
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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019-2024 Hewlett Packard Enterprise Development LP */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <sbl/sbl_pml.h>
#include "sbl_kconfig.h"
#include "sbl.h"
#include "sbl_serdes_map.h"
#include "sbl_pml.h"
#include "sbl_link.h"
#include "sbl_an.h"
#include "sbl_serdes.h"
#include "sbl_serdes_fn.h"
#include "sbl_internal.h"
#include "sbl_fec.h"
static int sbl_base_link_lp_detect(struct sbl_inst *sbl, int port_num);
static int sbl_base_link_check_fix_fw(struct sbl_inst *sbl, int port_num);
static int sbl_base_link_get_mode(struct sbl_inst *sbl, int port_num);
static bool sbl_base_link_an_timed_out(struct sbl_inst *sbl, int port_num, int err);
static int sbl_link_get_mode_electrical(struct sbl_inst *sbl, int port_num);
static int sbl_link_get_mode_optical(struct sbl_inst *sbl, int port_num);
static int sbl_link_fault_monitor_start(struct sbl_inst *sbl, int port_num);
static int sbl_link_fault_monitor_stop(struct sbl_inst *sbl, int port_num);
static void sbl_base_link_report_err(struct sbl_inst *sbl, char *txt,
int port_num, int err);
int sbl_get_lp_subtype(struct sbl_inst *sbl, int port_num, enum sbl_lp_subtype *lp_subtype)
{
int err;
struct sbl_link *link;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
if (lp_subtype == NULL)
return -EINVAL;
sbl_dev_dbg(sbl->dev, "%d: get lp subtype", port_num);
link = sbl->link + port_num;
*lp_subtype = link->lp_subtype;
return 0;
}
EXPORT_SYMBOL(sbl_get_lp_subtype);
/*
*
* principal base link control API
*
*
*/
int sbl_base_link_config(struct sbl_inst *sbl, int port_num, struct sbl_base_link_attr *blattr)
{
struct sbl_link *link;
int err;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
sbl_dev_dbg(sbl->dev, "bl %d: config\n", port_num);
if (!blattr)
return -EINVAL;
if (blattr->magic != SBL_LINK_ATTR_MAGIC)
return -EINVAL;
link = sbl->link + port_num;
spin_lock(&link->lock);
if (!(link->blstate & (SBL_BASE_LINK_STATUS_DOWN|SBL_BASE_LINK_STATUS_UNCONFIGURED))) {
sbl_dev_err(sbl->dev, "bl %d: wrong state (%s) for config", port_num,
sbl_link_state_str(link->blstate));
spin_unlock(&link->lock);
return -EUCLEAN;
}
memcpy(&link->blattr, blattr, sizeof(struct sbl_base_link_attr));
link->blconfigured = true;
if (link->blattr.loopback_mode == SBL_LOOPBACK_MODE_LOCAL) {
/* we dont need media to go to down */
link->blstate = SBL_BASE_LINK_STATUS_DOWN;
} else if (link->mconfigured) {
/* we need media as well if not loopback */
link->blstate = SBL_BASE_LINK_STATUS_DOWN;
}
spin_unlock(&link->lock);
return 0;
}
EXPORT_SYMBOL(sbl_base_link_config);
int sbl_base_link_start(struct sbl_inst *sbl, int port_num)
{
int err;
int tmp_err;
u32 base = SBL_PML_BASE(port_num);
u64 cfg_pcs_reg;
u64 sts_pcs_lane_degrade_reg;
struct lane_degrade lanes;
u32 ucw_adj = 100;
u32 ccw_adj = 0;
s32 ucw_in = SBL_LINK_FEC_HPE;
s32 ccw_in = SBL_LINK_FEC_HPE;
struct sbl_link *link = sbl->link + port_num;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
sbl_dev_dbg(sbl->dev, "bl %d: start\n", port_num);
link = sbl->link + port_num;
err = mutex_lock_interruptible(&link->busy_mtx);
if (err)
return -ERESTARTSYS;
if (link->blstate == SBL_BASE_LINK_STATUS_UP) {
/* link came up while waiting for the mutex */
mutex_unlock(&link->busy_mtx);
return 0;
}
if (link->blstate != SBL_BASE_LINK_STATUS_DOWN) {
sbl_dev_err(sbl->dev, "bl %d: wrong state (%s) for start", port_num,
sbl_link_state_str(link->blstate));
mutex_unlock(&link->busy_mtx);
return -EUCLEAN;
}
/*
* only local loopback is possible without media
*/
if (link->blattr.loopback_mode != SBL_LOOPBACK_MODE_LOCAL) {
err = sbl_media_validate_config(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: config unsuitable for media type", port_num);
mutex_unlock(&link->busy_mtx);
return err;
}
}
link->blstate = SBL_BASE_LINK_STATUS_STARTING;
/*
* check for loopback mode change
*/
if (link->blattr.loopback_mode != link->loopback_mode)
link->llr_loop_time = 0;
link->loopback_mode = link->blattr.loopback_mode;
/*
* setup the timeout for start to complete
* (autoneg might modify this later)
*/
sbl_link_init_start_timeout(sbl, port_num);
/*
* clear out any residual pcs state
*/
sbl_pml_set_defaults(sbl, port_num);
/* reset state */
link->lp_detected = false;
/*
* validate serdes firmwares are (still) uncorrupted, recover them if
* needed
*
*/
err = sbl_base_link_check_fix_fw(sbl, port_num);
if (err) {
sbl_base_link_report_err(sbl, "ensure_healthly", port_num, err);
goto out;
}
/*
* determine the link mode
*
* this may do autoneg for electrical links
*/
err = sbl_base_link_get_mode(sbl, port_num);
if (err) {
if (sbl_base_link_an_timed_out(sbl, port_num, err))
sbl_dev_dbg(sbl->dev, "bl %d: autoneg timeout", port_num);
else
sbl_base_link_report_err(sbl, "get_mode", port_num, err);
goto out;
}
/* start sending alignment markers for lp to tune against */
err = sbl_pml_pcs_am_start(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: am_start failed [%d]\n", port_num, err);
goto out;
}
/*
* wait until we detect the link partner
*/
err = sbl_base_link_lp_detect(sbl, port_num);
if (err) {
sbl_base_link_report_err(sbl, "lpd", port_num, err);
goto out;
}
/* record when we really start to bring up the link */
sbl_link_up_begin(sbl, port_num);
/*
* start the serdes
*/
err = sbl_serdes_start(sbl, port_num);
if (err) {
sbl_base_link_report_err(sbl, "serdes_start", port_num, err);
goto out;
}
/*
* start the pml block (pcs,mac,llr)
*/
err = sbl_pml_start(sbl, port_num);
if (err) {
sbl_base_link_report_err(sbl, "pml_start", port_num, err);
goto out_serdes;
}
/* clearing fec values before start */
sbl_zero_all_fec_counts(sbl, port_num);
/* setup thresholds and adjustments for fec monitoring */
err = sbl_fec_thresholds_set(sbl, port_num, ucw_in, ccw_in);
if (err) {
sbl_dev_err(sbl->dev, "%d: setting fec thresholds failed [%d]",
port_num, err);
goto out_pcs;
}
err = sbl_fec_adjustments_set(sbl, port_num, ucw_adj, ccw_adj);
if (err) {
sbl_dev_err(sbl->dev, "%d: setting fec adjustments failed [%d]",
port_num, err);
goto out_pcs;
}
/*
* start fec checking
*/
err = sbl_fec_up_check(sbl, port_num);
if (err) {
sbl_serdes_invalidate_tuning_params(sbl, port_num);
sbl_dev_info(sbl->dev, "%d: failed start fec check", err);
goto out_pcs;
}
/*
* start monitoring for link faults
*/
err = sbl_link_fault_monitor_start(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: link fault detect start failed [%d]\n", port_num, err);
goto out_pcs;
}
/*
* final check the link is still up and all lanes remain active
*/
if (!sbl_pml_pcs_up(sbl, port_num)) {
sbl_dev_err(sbl->dev, "bl %d: link failed during startup\n", port_num);
err = -ENETDOWN;
goto out_fm;
}
cfg_pcs_reg = sbl_read64(sbl, base | SBL_PML_CFG_PCS_OFFSET);
if (SBL_PML_CFG_PCS_ENABLE_AUTO_LANE_DEGRADE_GET(cfg_pcs_reg)) {
sts_pcs_lane_degrade_reg = sbl_read64(sbl, base | SBL_PML_STS_PCS_LANE_DEGRADE_OFFSET);
lanes.tx = SBL_PML_STS_PCS_LANE_DEGRADE_LP_PLS_AVAILABLE_GET(sts_pcs_lane_degrade_reg);
lanes.rx = SBL_PML_STS_PCS_LANE_DEGRADE_RX_PLS_AVAILABLE_GET(sts_pcs_lane_degrade_reg);
if (lanes.tx != SBL_LINK_ALL_LANES || lanes.rx != SBL_LINK_ALL_LANES) {
sbl_dev_err(sbl->dev, "bl %d: lane failed during startup - TX: 0x%llx - RX: 0x%llx",
port_num, lanes.tx, lanes.rx);
err = -ENETDOWN;
goto out_fm;
}
}
/* success ! */
sbl_link_up_record_timespec(sbl, port_num);
sbl_link_start_record_timespec(sbl, port_num);
link->blstate = SBL_BASE_LINK_STATUS_UP;
link->blerr = 0;
sbl_dev_dbg(sbl->dev, "starting timer port_num:%d ", port_num);
mod_timer(&link->fec_data->fec_timer, jiffies + msecs_to_jiffies(SBL_FEC_MON_PERIOD));
mutex_unlock(&link->busy_mtx);
return 0;
/*
* failed
*/
out_fm:
sbl_link_fault_monitor_stop(sbl, port_num);
out_pcs:
if (!sbl_debug_option(sbl, port_num, SBL_DEBUG_INHIBIT_CLEANUP))
sbl_pml_link_down(sbl, port_num);
out_serdes:
if (!sbl_debug_option(sbl, port_num, SBL_DEBUG_INHIBIT_CLEANUP))
sbl_serdes_stop(sbl, port_num);
out:
if (sbl_debug_option(sbl, port_num, SBL_DEBUG_INHIBIT_CLEANUP) ||
sbl_debug_option(sbl, port_num, SBL_DEBUG_INHIBIT_RELOAD_FW))
link->reload_serdes_fw = false;
else if (sbl_debug_option(sbl, port_num, SBL_DEBUG_FORCE_RELOAD_FW))
link->reload_serdes_fw = true;
if (link->reload_serdes_fw) {
sbl_dev_info(sbl->dev, "bl %d: reloading serdes fw\n", port_num);
tmp_err = sbl_serdes_firmware_flash_safe(sbl, port_num, true);
if (tmp_err) {
/* All we can do is report failure here */
sbl_dev_err(sbl->dev, "bl %d: fw flash failed [%d]\n",
port_num, tmp_err);
link->sstate = SBL_SERDES_STATUS_ERROR;
} else
link->sstate = SBL_SERDES_STATUS_DOWN;
link->serr = tmp_err;
link->reload_serdes_fw = false;
}
link->blstate = SBL_BASE_LINK_STATUS_ERROR;
link->blerr = err;
mutex_unlock(&link->busy_mtx);
return err;
}
EXPORT_SYMBOL(sbl_base_link_start);
static void sbl_base_link_report_err(struct sbl_inst *sbl, char *txt, int port_num, int err)
{
switch (err) {
case -ECANCELED:
sbl_dev_dbg(sbl->dev, "bl %d: %s cancelled\n", port_num, txt);
break;
case -ETIMEDOUT:
sbl_dev_dbg(sbl->dev, "bl %d: %s timed out\n", port_num, txt);
break;
default:
sbl_dev_err(sbl->dev, "bl %d: %s failed [%d]\n", port_num, txt, err);
}
}
void sbl_ignore_save_tuning_param(struct sbl_inst *sbl, int port_num, bool ignore)
{
struct sbl_link *link = sbl->link + port_num;
if (ignore)
link->blattr.options &= ~SBL_OPT_USE_SAVED_PARAMS;
else
link->blattr.options |= SBL_OPT_USE_SAVED_PARAMS;
}
EXPORT_SYMBOL(sbl_ignore_save_tuning_param);
void sbl_enable_opt_lane_degrade(struct sbl_inst *sbl, int port_num, bool enable)
{
struct sbl_link *link = sbl->link + port_num;
if (enable)
link->blattr.options |= SBL_OPT_LANE_DEGRADE;
else
link->blattr.options &= ~SBL_OPT_LANE_DEGRADE;
}
EXPORT_SYMBOL(sbl_enable_opt_lane_degrade);
void sbl_disable_pml_recovery(struct sbl_inst *sbl, int port_num, bool disable)
{
struct sbl_link *link = sbl->link + port_num;
if (disable)
link->blattr.options |= SBL_DISABLE_PML_RECOVERY;
else
link->blattr.options &= ~SBL_DISABLE_PML_RECOVERY;
}
EXPORT_SYMBOL(sbl_disable_pml_recovery);
void sbl_set_degraded_flag(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
spin_lock(&link->is_degraded_lock);
link->is_degraded = true;
spin_unlock(&link->is_degraded_lock);
}
EXPORT_SYMBOL(sbl_set_degraded_flag);
void sbl_clear_degraded_flag(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
spin_lock(&link->is_degraded_lock);
link->is_degraded = false;
spin_unlock(&link->is_degraded_lock);
}
EXPORT_SYMBOL(sbl_clear_degraded_flag);
bool sbl_get_degraded_flag(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
bool degraded_flag;
spin_lock(&link->is_degraded_lock);
degraded_flag = link->is_degraded;
spin_unlock(&link->is_degraded_lock);
return degraded_flag;
}
EXPORT_SYMBOL(sbl_get_degraded_flag);
int sbl_base_link_enable_start(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
sbl_dev_dbg(sbl->dev, "bl %d: enable start\n", port_num);
spin_lock(&link->lock);
link->start_cancelled = false;
spin_unlock(&link->lock);
return 0;
}
EXPORT_SYMBOL(sbl_base_link_enable_start);
int sbl_base_link_cancel_start(struct sbl_inst *sbl, int port_num)
{
int rtn;
struct sbl_link *link = sbl->link + port_num;
struct fec_data *fec_data = link->fec_data;
sbl_dev_dbg(sbl->dev, "bl %d: cancelling start\n", port_num);
spin_lock(&link->lock);
link->start_cancelled = true;
spin_unlock(&link->lock);
rtn = del_timer_sync(&fec_data->fec_timer);
if (rtn < 0)
sbl_dev_warn(sbl->dev, "bl %d: del_timer_sync failed [%d]", port_num, rtn);
return 0;
}
EXPORT_SYMBOL(sbl_base_link_cancel_start);
bool sbl_base_link_start_cancelled(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
bool cancelled;
spin_lock(&link->lock);
cancelled = link->start_cancelled;
spin_unlock(&link->lock);
return cancelled;
}
int sbl_base_link_stop(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link;
int err;
int rtn;
struct fec_data *fec_data;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
sbl_dev_dbg(sbl->dev, "bl %d: stop", port_num);
link = sbl->link + port_num;
fec_data = link->fec_data;
err = mutex_lock_interruptible(&link->busy_mtx);
if (err)
return -ERESTARTSYS;
if (link->blstate == SBL_BASE_LINK_STATUS_DOWN) {
/* link went down while waiting for the mutex */
mutex_unlock(&link->busy_mtx);
return 0;
}
if (link->blstate != SBL_BASE_LINK_STATUS_UP) {
sbl_dev_err(sbl->dev, "bl %d: not up (%s) for stop - ignored", port_num,
sbl_link_state_str(link->blstate));
mutex_unlock(&link->busy_mtx);
return -EBUSY;
}
/* if keeping serdes up, don't change state to stopping */
if (!sbl_debug_option(sbl, port_num, SBL_DEBUG_KEEP_SERDES_UP))
link->blstate = SBL_BASE_LINK_STATUS_STOPPING;
/*
* We stop the serdes before stopping the pml to avoid breaking AOC firmware,
* really we should stop the pml first. This should be harmless provided
* down detection is off.
*/
err = sbl_link_fault_monitor_stop(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: link_fault_monitor_stop failed [%d]", port_num, err);
goto out;
}
if (link->pml_recovery.started)
sbl_pml_recovery_cancel(sbl, port_num);
err = sbl_serdes_stop(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: serdes_stop failed [%d]", port_num, err);
goto out;
}
err = sbl_pml_link_down(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "bl %d: pml_link_down failed [%d]", port_num, err);
goto out;
}
rtn = del_timer_sync(&fec_data->fec_timer);
if (rtn < 0)
sbl_dev_warn(sbl->dev, "bl %d: del_timer_sync failed [%d]", port_num, rtn);
out:
spin_lock(&link->lock);
if (err)
link->blstate = SBL_BASE_LINK_STATUS_ERROR;
/* if keep serdes up, don't change state to down */
else if (!sbl_debug_option(sbl, port_num, SBL_DEBUG_KEEP_SERDES_UP))
link->blstate = SBL_BASE_LINK_STATUS_DOWN;
link->blerr = err;
spin_unlock(&link->lock);
mutex_unlock(&link->busy_mtx);
sbl_dev_dbg(sbl->dev, "bl %d: stop done", port_num);
return link->blerr;
}
EXPORT_SYMBOL(sbl_base_link_stop);
int sbl_base_link_reset(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link;
int err;
int rtn;
struct fec_data *fec_data;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
sbl_dev_dbg(sbl->dev, "bl %d: reset\n", port_num);
link = sbl->link + port_num;
fec_data = link->fec_data;
err = mutex_lock_interruptible(&link->busy_mtx);
if (err)
return -ERESTARTSYS;
link->blstate = SBL_BASE_LINK_STATUS_RESETTING;
/* disable and remove any pml intr handlers */
if (link->intr_err_flgs) {
sbl_pml_disable_intr_handler(sbl, port_num, link->intr_err_flgs);
sbl_pml_remove_intr_handler(sbl, port_num);
link->intr_err_flgs = 0;
}
if (link->pml_recovery.started)
sbl_pml_recovery_cancel(sbl, port_num);
err = sbl_serdes_reset(sbl, port_num);
if (err)
sbl_dev_err(sbl->dev, "bl %d: reset: serdes_reset failed [%d]", port_num, err);
err = sbl_pml_link_down(sbl, port_num);
if (err)
sbl_dev_warn(sbl->dev, "bl %d: reset: pcs_link_down failed [%d]", port_num, err);
rtn = del_timer_sync(&fec_data->fec_timer);
if (rtn < 0)
sbl_dev_warn(sbl->dev, "bl %d: del_timer_sync failed [%d]", port_num, rtn);
link->blstate = SBL_BASE_LINK_STATUS_UNCONFIGURED;
link->blerr = 0;
link->blconfigured = false;
link->pcs_config = false;
link->llr_loop_time = 0;
link->start_cancelled = false;
link->link_info = 0;
link->lp_subtype = SBL_LP_SUBTYPE_INVALID;
/* dont reset media attribute */
/* reset hw */
sbl_pml_set_defaults(sbl, port_num);
sbl_pml_err_flgs_clear_all(sbl, port_num);
mutex_unlock(&link->busy_mtx);
return 0;
}
EXPORT_SYMBOL(sbl_base_link_reset);
/*
* try to clear any error states that are non-fatal so we can directly
* attempt another start up.
*/
void sbl_base_link_try_start_fail_cleanup(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link;
int err;
err = sbl_validate_instance(sbl);
if (err)
return;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return;
sbl_dev_dbg(sbl->dev, "bl %d: try start fail cleanup\n", port_num);
link = sbl->link + port_num;
err = mutex_lock_interruptible(&link->busy_mtx);
if (err)
return;
/* disable and remove any pml intr handlers */
if (link->intr_err_flgs) {
sbl_pml_disable_intr_handler(sbl, port_num, link->intr_err_flgs);
sbl_pml_remove_intr_handler(sbl, port_num);
link->intr_err_flgs = 0;
}
/*
* when debugging we can leave the hw in its current state
*/
if (sbl_debug_option(sbl, port_num, SBL_DEBUG_INHIBIT_CLEANUP)) {
sbl_dev_warn(sbl->dev, "%d: hw cleanup inhibited\n", port_num);
mutex_unlock(&link->busy_mtx);
return;
}
/*
* clean up the serdes state
* We have to do this before resetting the PML or the optical transceivers can
* fail.
*/
switch (link->sstate) {
case SBL_SERDES_STATUS_RUNNING:
sbl_serdes_stop(sbl, port_num);
break;
case SBL_SERDES_STATUS_AUTONEG:
sbl_an_serdes_stop(sbl, port_num);
break;
default:
break;
}
/* still not down! */
if (link->sstate != SBL_SERDES_STATUS_DOWN)
sbl_serdes_reset(sbl, port_num);
/*
* some errors we can clean up and move to down so
* we can try to come up again directly
*/
if (link->blstate == SBL_BASE_LINK_STATUS_ERROR) {
switch (link->blerr) {
case -EADV: /* pcs startup saw high serdes error rate */
case -ENETDOWN: /* pcs dropped out after starting */
case -ECHRNG: /* serdes eye heights went bad during pcs startup */
case -ELNRNG: /* unable to tune properly */
sbl_serdes_invalidate_all_tuning_params(sbl);
fallthrough;
case -ETIME:
case -ETIMEDOUT:
case -EOVERFLOW:
case -ECANCELED:
case -ENOSR: /* llr failed to start */
link->blstate = SBL_BASE_LINK_STATUS_DOWN;
link->blerr = 0;
link->pcs_config = false;
link->llr_loop_time = 0;
link->start_cancelled = false;
sbl_pml_link_down(sbl, port_num);
sbl_pml_set_defaults(sbl, port_num);
break;
default:
sbl_dev_err(sbl->dev, "%d: start fail cleanup not clearing err %d\n",
port_num, link->blerr);
break;
}
}
mutex_unlock(&link->busy_mtx);
}
EXPORT_SYMBOL(sbl_base_link_try_start_fail_cleanup);
static int sbl_link_fault_monitor_start(struct sbl_inst *sbl, int port_num)
{
int err;
u32 base = SBL_PML_BASE(port_num);
u64 val64;
u64 err_flags;
val64 = sbl_read64(sbl, base|SBL_PML_CFG_LLR_SM_OFFSET);
if (SBL_PML_CFG_LLR_SM_REPLAY_CT_MAX_GET(val64) < SBL_LLR_REPLAY_CT_MAX_UNLIMITED)
err_flags = SBL_PML_FAULT_ERR_FLAGS;
else
err_flags = SBL_PML_REC_FAULT_ERR_FLAGS;
/* make sure we have not already had an error */
if (sbl_pml_err_flgs_test(sbl, port_num, err_flags)) {
sbl_dev_err(sbl->dev, "fm %d: start - errors already present\n",
port_num);
err = -ENETDOWN;
goto out;
}
err = sbl_pml_install_intr_handler(sbl, port_num, err_flags);
if (err) {
sbl_dev_err(sbl->dev, "fm %d: intr install failed [%d]\n", port_num, err);
goto out;
}
err = sbl_pml_enable_intr_handler(sbl, port_num, err_flags);
if (err) {
sbl_dev_err(sbl->dev, "fm %d: intr enable failed [%d]\n", port_num, err);
goto out_uninstall;
return err;
}
if (sbl_pml_err_flgs_test(sbl, port_num, err_flags)) {
sbl_dev_err(sbl->dev, "fm %d: link down during start\n", port_num);
err = -ENETDOWN;
goto out_disable;
} else {
/* all up and running */
sbl_link_info_set(sbl, port_num, SBL_LINK_INFO_FAULT_MON);
}
return 0;
out_disable:
sbl_pml_disable_intr_handler(sbl, port_num, err_flags);
out_uninstall:
sbl_pml_remove_intr_handler(sbl, port_num);
out:
sbl_link_info_clear(sbl, port_num, SBL_LINK_INFO_FAULT_MON);
return err;
}
static int sbl_link_fault_monitor_stop(struct sbl_inst *sbl, int port_num)
{
int err;
u32 base = SBL_PML_BASE(port_num);
u64 val64;
u64 err_flags;
val64 = sbl_read64(sbl, base|SBL_PML_CFG_LLR_SM_OFFSET);
if (SBL_PML_CFG_LLR_SM_REPLAY_CT_MAX_GET(val64) < SBL_LLR_REPLAY_CT_MAX_UNLIMITED)
err_flags = SBL_PML_FAULT_ERR_FLAGS;
else
err_flags = SBL_PML_REC_FAULT_ERR_FLAGS;
err = sbl_pml_disable_intr_handler(sbl, port_num, err_flags);
if (err) {
sbl_dev_err(sbl->dev, "fm %d: intr disable failed [%d]\n", port_num, err);
return err;
}
err = sbl_pml_remove_intr_handler(sbl, port_num);
if (err) {
sbl_dev_err(sbl->dev, "fm %d: intr remove failed [%d]\n", port_num, err);
return err;
}
sbl_link_info_clear(sbl, port_num, SBL_LINK_INFO_FAULT_MON);
return 0;
}
int sbl_base_link_get_status(struct sbl_inst *sbl, int port_num,
int *blstate, int *blerr, int *sstate, int *serr,
int *media_type, int *link_mode)
{
struct sbl_link *link;
int err;
err = sbl_validate_instance(sbl);
if (err)
return err;
err = sbl_validate_port_num(sbl, port_num);
if (err)
return err;
link = sbl->link + port_num;
if (blstate)
*blstate = link->blstate;
if (blerr)
*blerr = link->blerr;
if (sstate)
*sstate = link->sstate;
if (serr)
*serr = link->serr;
if (media_type)
*media_type = link->mattr.media;
if (link_mode) {
if (link->sstate == SBL_SERDES_STATUS_RUNNING)
*link_mode = link->link_mode; /* actual mode */
else
*link_mode = link->blattr.link_mode; /* target mode */
}
return 0;
}
EXPORT_SYMBOL(sbl_base_link_get_status);
/*
* update a string with the state of the pcs and serdes
*/
char *sbl_base_link_state_str(struct sbl_inst *sbl, int port_num, char *buf, int len)
{
char pcs_buf[SBL_PCS_STATE_STR_LEN];
u8 not_idle_map; // not signalling electrical idle
u8 good_eyes_map;
u8 active_map;
if (!buf || !len)
return "";
sbl_pml_pcs_state_str(sbl, port_num, pcs_buf, SBL_PCS_STATE_STR_LEN);
if (sbl_port_get_serdes_state_maps(sbl, port_num, &active_map,
¬_idle_map, &good_eyes_map)) {
/* only active map unavailable */
snprintf(buf, len, "pcs %s, serdes -,-/%x", pcs_buf, active_map);
} else
snprintf(buf, len, "pcs %s, serdes %x,%x/%x", pcs_buf,
not_idle_map, good_eyes_map, active_map);
return buf;
}
EXPORT_SYMBOL(sbl_base_link_state_str);
/*
* detect the presence of our link partner
*/
static int sbl_base_link_lp_detect(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
int err = 0;
/* already detected - probably from autoneg */
if (link->lp_detected)
return 0;
sbl_link_info_set(sbl, port_num, SBL_LINK_INFO_LP_DET);
/* currently we have only one way to do this */
if (link->blattr.options & SBL_OPT_SERDES_LPD) {
err = sbl_serdes_lp_detect(sbl, port_num);
if (!err)
link->lp_detected = true;
}
sbl_link_info_clear(sbl, port_num, SBL_LINK_INFO_LP_DET);
return err;
}
/*
* Check/recover SBL FW
*
*/
static int sbl_base_link_check_fix_fw(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
int serdes;
int err;
for (serdes = 0; serdes < sbl->switch_info->num_serdes; ++serdes) {
err = sbl_validate_serdes_fw_crc(sbl, port_num, serdes);
if (err) {
/* Any lane with corrputed FW will cause all lanes for
* the port to be reloaded.
*/
goto reload_fw;
}
}
return 0;
reload_fw:
err = sbl_serdes_firmware_flash_safe(sbl, port_num, false);
if (err) {
/* All we can do is report failure here */
sbl_dev_err(sbl->dev, "%d: check/fix: fw flash failed [%d]\n",
port_num, err);
link->sstate = SBL_SERDES_STATUS_ERROR;
}
return err;
}
/*
* determine the link mode (speed)
*
*/
static int sbl_base_link_get_mode(struct sbl_inst *sbl, int port_num)
{
struct sbl_link *link = sbl->link + port_num;
int err = 0;
/* determine required mode */
if (link->loopback_mode == SBL_LOOPBACK_MODE_LOCAL) {
/* directly use the mode specified - no media check */
link->link_mode = link->blattr.link_mode;
return 0;
}
switch (link->mattr.media) {