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ixgbe: Merge watchdog functionality into service task

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This patch is meant to merge the functionality of the ixgbe watchdog task
into the service task.  By doing this all link state functionality will be
controlled by a single task.  As a result the reliability of the interface
will be improved as the likelihood of any race conditions is further
reduced.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2011-04-22 04:07:54 +00:00 committed by Jeff Kirsher
parent 7086400d87
commit 93c52dd003
2 changed files with 218 additions and 184 deletions
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2
drivers/net/ixgbe/ixgbe.h
View File

@ -455,11 +455,9 @@ struct ixgbe_adapter {
unsigned long link_check_timeout;
struct work_struct reset_task;
struct work_struct watchdog_task;
struct work_struct fdir_reinit_task;
struct work_struct check_overtemp_task;
struct work_struct service_task;
struct timer_list watchdog_timer;
struct timer_list service_timer;
u32 fdir_pballoc;
u32 atr_sample_rate;

400
drivers/net/ixgbe/ixgbe_main.c
View File

@ -1900,7 +1900,7 @@ static void ixgbe_check_lsc(struct ixgbe_adapter *adapter)
if (!test_bit(__IXGBE_DOWN, &adapter->state)) {
IXGBE_WRITE_REG(hw, IXGBE_EIMC, IXGBE_EIMC_LSC);
IXGBE_WRITE_FLUSH(hw);
schedule_work(&adapter->watchdog_task);
ixgbe_service_event_schedule(adapter);
}
}
@ -3940,7 +3940,6 @@ static int ixgbe_up_complete(struct ixgbe_adapter *adapter)
* link up interrupt but shouldn't be a problem */
adapter->flags |= IXGBE_FLAG_NEED_LINK_UPDATE;
adapter->link_check_timeout = jiffies;
mod_timer(&adapter->watchdog_timer, jiffies);
mod_timer(&adapter->service_timer, jiffies);
/* Set PF Reset Done bit so PF/VF Mail Ops can work */
@ -4179,8 +4178,6 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
netif_tx_stop_all_queues(netdev);
del_timer_sync(&adapter->watchdog_timer);
cancel_work_sync(&adapter->watchdog_task);
/* call carrier off first to avoid false dev_watchdog timeouts */
netif_carrier_off(netdev);
netif_tx_disable(netdev);
@ -5956,54 +5953,6 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
netdev->stats.rx_missed_errors = total_mpc;
}
/**
* ixgbe_watchdog - Timer Call-back
* @data: pointer to adapter cast into an unsigned long
**/
static void ixgbe_watchdog(unsigned long data)
{
struct ixgbe_adapter *adapter = (struct ixgbe_adapter *)data;
struct ixgbe_hw *hw = &adapter->hw;
u64 eics = 0;
int i;
/*
* Do the watchdog outside of interrupt context due to the lovely
* delays that some of the newer hardware requires
*/
if (test_bit(__IXGBE_DOWN, &adapter->state))
goto watchdog_short_circuit;
if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) {
/*
* for legacy and MSI interrupts don't set any bits
* that are enabled for EIAM, because this operation
* would set *both* EIMS and EICS for any bit in EIAM
*/
IXGBE_WRITE_REG(hw, IXGBE_EICS,
(IXGBE_EICS_TCP_TIMER | IXGBE_EICS_OTHER));
goto watchdog_reschedule;
}
/* get one bit for every active tx/rx interrupt vector */
for (i = 0; i < adapter->num_msix_vectors - NON_Q_VECTORS; i++) {
struct ixgbe_q_vector *qv = adapter->q_vector[i];
if (qv->rxr_count || qv->txr_count)
eics |= ((u64)1 << i);
}
/* Cause software interrupt to ensure rx rings are cleaned */
ixgbe_irq_rearm_queues(adapter, eics);
watchdog_reschedule:
/* Reset the timer */
mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 2 * HZ));
watchdog_short_circuit:
schedule_work(&adapter->watchdog_task);
}
/**
* ixgbe_fdir_reinit_task - worker thread to reinit FDIR filter table
* @work: pointer to work_struct containing our data
@ -6028,6 +5977,208 @@ static void ixgbe_fdir_reinit_task(struct work_struct *work)
netif_tx_start_all_queues(adapter->netdev);
}
/**
* ixgbe_check_hang_subtask - check for hung queues and dropped interrupts
* @adapter - pointer to the device adapter structure
*
* This function serves two purposes. First it strobes the interrupt lines
* in order to make certain interrupts are occuring. Secondly it sets the
* bits needed to check for TX hangs. As a result we should immediately
* determine if a hang has occured.
*/
static void ixgbe_check_hang_subtask(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u64 eics = 0;
int i;
/* If we're down or resetting, just bail */
if (test_bit(__IXGBE_DOWN, &adapter->state) ||
test_bit(__IXGBE_RESETTING, &adapter->state))
return;
/* Force detection of hung controller */
if (netif_carrier_ok(adapter->netdev)) {
for (i = 0; i < adapter->num_tx_queues; i++)
set_check_for_tx_hang(adapter->tx_ring[i]);
}
if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) {
/*
* for legacy and MSI interrupts don't set any bits
* that are enabled for EIAM, because this operation
* would set *both* EIMS and EICS for any bit in EIAM
*/
IXGBE_WRITE_REG(hw, IXGBE_EICS,
(IXGBE_EICS_TCP_TIMER | IXGBE_EICS_OTHER));
} else {
/* get one bit for every active tx/rx interrupt vector */
for (i = 0; i < adapter->num_msix_vectors - NON_Q_VECTORS; i++) {
struct ixgbe_q_vector *qv = adapter->q_vector[i];
if (qv->rxr_count || qv->txr_count)
eics |= ((u64)1 << i);
}
}
/* Cause software interrupt to ensure rings are cleaned */
ixgbe_irq_rearm_queues(adapter, eics);
}
/**
* ixgbe_watchdog_update_link - update the link status
* @adapter - pointer to the device adapter structure
* @link_speed - pointer to a u32 to store the link_speed
**/
static void ixgbe_watchdog_update_link(struct ixgbe_adapter *adapter)
{
struct ixgbe_hw *hw = &adapter->hw;
u32 link_speed = adapter->link_speed;
bool link_up = adapter->link_up;
int i;
if (!(adapter->flags & IXGBE_FLAG_NEED_LINK_UPDATE))
return;
if (hw->mac.ops.check_link) {
hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
} else {
/* always assume link is up, if no check link function */
link_speed = IXGBE_LINK_SPEED_10GB_FULL;
link_up = true;
}
if (link_up) {
if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
hw->mac.ops.fc_enable(hw, i);
} else {
hw->mac.ops.fc_enable(hw, 0);
}
}
if (link_up ||
time_after(jiffies, (adapter->link_check_timeout +
IXGBE_TRY_LINK_TIMEOUT))) {
adapter->flags &= ~IXGBE_FLAG_NEED_LINK_UPDATE;
IXGBE_WRITE_REG(hw, IXGBE_EIMS, IXGBE_EIMC_LSC);
IXGBE_WRITE_FLUSH(hw);
}
adapter->link_up = link_up;
adapter->link_speed = link_speed;
}
/**
* ixgbe_watchdog_link_is_up - update netif_carrier status and
* print link up message
* @adapter - pointer to the device adapter structure
**/
static void ixgbe_watchdog_link_is_up(struct ixgbe_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct ixgbe_hw *hw = &adapter->hw;
u32 link_speed = adapter->link_speed;
bool flow_rx, flow_tx;
/* only continue if link was previously down */
if (netif_carrier_ok(netdev))
return;
adapter->flags2 &= ~IXGBE_FLAG2_SEARCH_FOR_SFP;
switch (hw->mac.type) {
case ixgbe_mac_82598EB: {
u32 frctl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
u32 rmcs = IXGBE_READ_REG(hw, IXGBE_RMCS);
flow_rx = !!(frctl & IXGBE_FCTRL_RFCE);
flow_tx = !!(rmcs & IXGBE_RMCS_TFCE_802_3X);
}
break;
case ixgbe_mac_X540:
case ixgbe_mac_82599EB: {
u32 mflcn = IXGBE_READ_REG(hw, IXGBE_MFLCN);
u32 fccfg = IXGBE_READ_REG(hw, IXGBE_FCCFG);
flow_rx = !!(mflcn & IXGBE_MFLCN_RFCE);
flow_tx = !!(fccfg & IXGBE_FCCFG_TFCE_802_3X);
}
break;
default:
flow_tx = false;
flow_rx = false;
break;
}
e_info(drv, "NIC Link is Up %s, Flow Control: %s\n",
(link_speed == IXGBE_LINK_SPEED_10GB_FULL ?
"10 Gbps" :
(link_speed == IXGBE_LINK_SPEED_1GB_FULL ?
"1 Gbps" :
(link_speed == IXGBE_LINK_SPEED_100_FULL ?
"100 Mbps" :
"unknown speed"))),
((flow_rx && flow_tx) ? "RX/TX" :
(flow_rx ? "RX" :
(flow_tx ? "TX" : "None"))));
netif_carrier_on(netdev);
#ifdef HAVE_IPLINK_VF_CONFIG
ixgbe_check_vf_rate_limit(adapter);
#endif /* HAVE_IPLINK_VF_CONFIG */
}
/**
* ixgbe_watchdog_link_is_down - update netif_carrier status and
* print link down message
* @adapter - pointer to the adapter structure
**/
static void ixgbe_watchdog_link_is_down(struct ixgbe_adapter* adapter)
{
struct net_device *netdev = adapter->netdev;
struct ixgbe_hw *hw = &adapter->hw;
adapter->link_up = false;
adapter->link_speed = 0;
/* only continue if link was up previously */
if (!netif_carrier_ok(netdev))
return;
/* poll for SFP+ cable when link is down */
if (ixgbe_is_sfp(hw) && hw->mac.type == ixgbe_mac_82598EB)
adapter->flags2 |= IXGBE_FLAG2_SEARCH_FOR_SFP;
e_info(drv, "NIC Link is Down\n");
netif_carrier_off(netdev);
}
/**
* ixgbe_watchdog_flush_tx - flush queues on link down
* @adapter - pointer to the device adapter structure
**/
static void ixgbe_watchdog_flush_tx(struct ixgbe_adapter *adapter)
{
int i;
int some_tx_pending = 0;
if (!netif_carrier_ok(adapter->netdev)) {
for (i = 0; i < adapter->num_tx_queues; i++) {
struct ixgbe_ring *tx_ring = adapter->tx_ring[i];
if (tx_ring->next_to_use != tx_ring->next_to_clean) {
some_tx_pending = 1;
break;
}
}
if (some_tx_pending) {
/* We've lost link, so the controller stops DMA,
* but we've got queued Tx work that's never going
* to get done, so reset controller to flush Tx.
* (Do the reset outside of interrupt context).
*/
schedule_work(&adapter->reset_task);
}
}
}
static void ixgbe_spoof_check(struct ixgbe_adapter *adapter)
{
u32 ssvpc;
@ -6048,133 +6199,27 @@ static void ixgbe_spoof_check(struct ixgbe_adapter *adapter)
e_warn(drv, "%d Spoofed packets detected\n", ssvpc);
}
static DEFINE_MUTEX(ixgbe_watchdog_lock);
/**
* ixgbe_watchdog_task - worker thread to bring link up
* @work: pointer to work_struct containing our data
* ixgbe_watchdog_subtask - check and bring link up
* @adapter - pointer to the device adapter structure
**/
static void ixgbe_watchdog_task(struct work_struct *work)
static void ixgbe_watchdog_subtask(struct ixgbe_adapter *adapter)
{
struct ixgbe_adapter *adapter = container_of(work,
struct ixgbe_adapter,
watchdog_task);
struct net_device *netdev = adapter->netdev;
struct ixgbe_hw *hw = &adapter->hw;
u32 link_speed;
bool link_up;
int i;
struct ixgbe_ring *tx_ring;
int some_tx_pending = 0;
/* if interface is down do nothing */
if (test_bit(__IXGBE_DOWN, &adapter->state))
return;
mutex_lock(&ixgbe_watchdog_lock);
ixgbe_watchdog_update_link(adapter);
link_up = adapter->link_up;
link_speed = adapter->link_speed;
if (adapter->flags & IXGBE_FLAG_NEED_LINK_UPDATE) {
hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
if (link_up) {
#ifdef CONFIG_DCB
if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
hw->mac.ops.fc_enable(hw, i);
} else {
hw->mac.ops.fc_enable(hw, 0);
}
#else
hw->mac.ops.fc_enable(hw, 0);
#endif
}
if (link_up ||
time_after(jiffies, (adapter->link_check_timeout +
IXGBE_TRY_LINK_TIMEOUT))) {
adapter->flags &= ~IXGBE_FLAG_NEED_LINK_UPDATE;
IXGBE_WRITE_REG(hw, IXGBE_EIMS, IXGBE_EIMC_LSC);
}
adapter->link_up = link_up;
adapter->link_speed = link_speed;
}
if (link_up) {
if (!netif_carrier_ok(netdev)) {
bool flow_rx, flow_tx;
switch (hw->mac.type) {
case ixgbe_mac_82598EB: {
u32 frctl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
u32 rmcs = IXGBE_READ_REG(hw, IXGBE_RMCS);
flow_rx = !!(frctl & IXGBE_FCTRL_RFCE);
flow_tx = !!(rmcs & IXGBE_RMCS_TFCE_802_3X);
}
break;
case ixgbe_mac_82599EB:
case ixgbe_mac_X540: {
u32 mflcn = IXGBE_READ_REG(hw, IXGBE_MFLCN);
u32 fccfg = IXGBE_READ_REG(hw, IXGBE_FCCFG);
flow_rx = !!(mflcn & IXGBE_MFLCN_RFCE);
flow_tx = !!(fccfg & IXGBE_FCCFG_TFCE_802_3X);
}
break;
default:
flow_tx = false;
flow_rx = false;
break;
}
e_info(drv, "NIC Link is Up %s, Flow Control: %s\n",
(link_speed == IXGBE_LINK_SPEED_10GB_FULL ?
"10 Gbps" :
(link_speed == IXGBE_LINK_SPEED_1GB_FULL ?
"1 Gbps" :
(link_speed == IXGBE_LINK_SPEED_100_FULL ?
"100 Mbps" :
"unknown speed"))),
((flow_rx && flow_tx) ? "RX/TX" :
(flow_rx ? "RX" :
(flow_tx ? "TX" : "None"))));
netif_carrier_on(netdev);
ixgbe_check_vf_rate_limit(adapter);
} else {
/* Force detection of hung controller */
for (i = 0; i < adapter->num_tx_queues; i++) {
tx_ring = adapter->tx_ring[i];
set_check_for_tx_hang(tx_ring);
}
}
} else {
adapter->link_up = false;
adapter->link_speed = 0;
if (netif_carrier_ok(netdev)) {
e_info(drv, "NIC Link is Down\n");
netif_carrier_off(netdev);
}
}
if (!netif_carrier_ok(netdev)) {
for (i = 0; i < adapter->num_tx_queues; i++) {
tx_ring = adapter->tx_ring[i];
if (tx_ring->next_to_use != tx_ring->next_to_clean) {
some_tx_pending = 1;
break;
}
}
if (some_tx_pending) {
/* We've lost link, so the controller stops DMA,
* but we've got queued Tx work that's never going
* to get done, so reset controller to flush Tx.
* (Do the reset outside of interrupt context).
*/
schedule_work(&adapter->reset_task);
}
}
if (adapter->link_up)
ixgbe_watchdog_link_is_up(adapter);
else
ixgbe_watchdog_link_is_down(adapter);
ixgbe_spoof_check(adapter);
ixgbe_update_stats(adapter);
mutex_unlock(&ixgbe_watchdog_lock);
ixgbe_watchdog_flush_tx(adapter);
}
/**
@ -6308,6 +6353,8 @@ static void ixgbe_service_task(struct work_struct *work)
ixgbe_sfp_detection_subtask(adapter);
ixgbe_sfp_link_config_subtask(adapter);
ixgbe_watchdog_subtask(adapter);
ixgbe_check_hang_subtask(adapter);
ixgbe_service_event_complete(adapter);
}
@ -7485,12 +7532,8 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
setup_timer(&adapter->service_timer, &ixgbe_service_timer,
(unsigned long) adapter);
init_timer(&adapter->watchdog_timer);
adapter->watchdog_timer.function = ixgbe_watchdog;
adapter->watchdog_timer.data = (unsigned long)adapter;
INIT_WORK(&adapter->reset_task, ixgbe_reset_task);
INIT_WORK(&adapter->watchdog_task, ixgbe_watchdog_task);
INIT_WORK(&adapter->service_task, ixgbe_service_task);
clear_bit(__IXGBE_SERVICE_SCHED, &adapter->state);
@ -7643,13 +7686,6 @@ static void __devexit ixgbe_remove(struct pci_dev *pdev)
set_bit(__IXGBE_DOWN, &adapter->state);
cancel_work_sync(&adapter->service_task);
/*
* The timers may be rescheduled, so explicitly disable them
* from being rescheduled.
*/
del_timer_sync(&adapter->watchdog_timer);
cancel_work_sync(&adapter->watchdog_task);
if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE ||
adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)
cancel_work_sync(&adapter->fdir_reinit_task);