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authorEmil Tantilov <emil.s.tantilov@intel.com>2015-01-28 03:21:34 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2015-02-05 19:58:45 -0800
commit9ac5c5ccdbfd41c1dea802462a9b0abcfc106abc (patch)
tree57a985688edf80ef30efa9df0a373af08e63549e /drivers/net/ethernet/intel/ixgbevf
parente66c92ad5839ffd0ffd0ac7f7afd622151ef6272 (diff)
downloadlinux-linaro-stable-9ac5c5ccdbfd41c1dea802462a9b0abcfc106abc.tar.gz
ixgbevf: combine all of the tasks into a single service task
This change combines the reset and watchdog tasklets into a single task. The advantage of this is that we can avoid multiple schedules of the reset task when we have a reset event needed due to either the mailbox going down or transmit packets being present on a link down. CC: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com> Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbevf')
-rw-r--r--drivers/net/ethernet/intel/ixgbevf/ixgbevf.h13
-rw-r--r--drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c140
2 files changed, 87 insertions, 66 deletions
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index a41ab370278f..3a9b356dff01 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -367,8 +367,6 @@ struct ixgbevf_adapter {
/* this field must be first, see ixgbevf_process_skb_fields */
unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
- struct timer_list watchdog_timer;
- struct work_struct reset_task;
struct ixgbevf_q_vector *q_vector[MAX_MSIX_Q_VECTORS];
/* Interrupt Throttle Rate */
@@ -398,8 +396,7 @@ struct ixgbevf_adapter {
* thus the additional *_CAPABLE flags.
*/
u32 flags;
-#define IXGBE_FLAG_IN_WATCHDOG_TASK (u32)(1)
-
+#define IXGBEVF_FLAG_RESET_REQUESTED (u32)(1)
#define IXGBEVF_FLAG_QUEUE_RESET_REQUESTED (u32)(1 << 2)
struct msix_entry *msix_entries;
@@ -435,10 +432,11 @@ struct ixgbevf_adapter {
u32 link_speed;
bool link_up;
+ struct timer_list service_timer;
+ struct work_struct service_task;
+
spinlock_t mbx_lock;
unsigned long last_reset;
-
- struct work_struct watchdog_task;
};
enum ixbgevf_state_t {
@@ -447,7 +445,8 @@ enum ixbgevf_state_t {
__IXGBEVF_DOWN,
__IXGBEVF_DISABLED,
__IXGBEVF_REMOVING,
- __IXGBEVF_WORK_INIT,
+ __IXGBEVF_SERVICE_SCHED,
+ __IXGBEVF_SERVICE_INITED,
};
enum ixgbevf_boards {
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index c1100654a4be..4186981e562d 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -98,6 +98,23 @@ static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+static void ixgbevf_service_event_schedule(struct ixgbevf_adapter *adapter)
+{
+ if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
+ !test_bit(__IXGBEVF_REMOVING, &adapter->state) &&
+ !test_and_set_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state))
+ schedule_work(&adapter->service_task);
+}
+
+static void ixgbevf_service_event_complete(struct ixgbevf_adapter *adapter)
+{
+ BUG_ON(!test_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state));
+
+ /* flush memory to make sure state is correct before next watchdog */
+ smp_mb__before_atomic();
+ clear_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state);
+}
+
/* forward decls */
static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter);
static void ixgbevf_set_itr(struct ixgbevf_q_vector *q_vector);
@@ -111,8 +128,8 @@ static void ixgbevf_remove_adapter(struct ixgbe_hw *hw)
return;
hw->hw_addr = NULL;
dev_err(&adapter->pdev->dev, "Adapter removed\n");
- if (test_bit(__IXGBEVF_WORK_INIT, &adapter->state))
- schedule_work(&adapter->watchdog_task);
+ if (test_bit(__IXGBEVF_SERVICE_INITED, &adapter->state))
+ ixgbevf_service_event_schedule(adapter);
}
static void ixgbevf_check_remove(struct ixgbe_hw *hw, u32 reg)
@@ -246,6 +263,15 @@ static inline bool ixgbevf_check_tx_hang(struct ixgbevf_ring *tx_ring)
return false;
}
+static void ixgbevf_tx_timeout_reset(struct ixgbevf_adapter *adapter)
+{
+ /* Do the reset outside of interrupt context */
+ if (!test_bit(__IXGBEVF_DOWN, &adapter->state)) {
+ adapter->flags |= IXGBEVF_FLAG_RESET_REQUESTED;
+ ixgbevf_service_event_schedule(adapter);
+ }
+}
+
/**
* ixgbevf_tx_timeout - Respond to a Tx Hang
* @netdev: network interface device structure
@@ -254,8 +280,7 @@ static void ixgbevf_tx_timeout(struct net_device *netdev)
{
struct ixgbevf_adapter *adapter = netdev_priv(netdev);
- /* Do the reset outside of interrupt context */
- schedule_work(&adapter->reset_task);
+ ixgbevf_tx_timeout_reset(adapter);
}
/**
@@ -387,7 +412,7 @@ static bool ixgbevf_clean_tx_irq(struct ixgbevf_q_vector *q_vector,
netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
/* schedule immediate reset if we believe we hung */
- schedule_work(&adapter->reset_task);
+ ixgbevf_tx_timeout_reset(adapter);
return true;
}
@@ -1239,9 +1264,7 @@ static irqreturn_t ixgbevf_msix_other(int irq, void *data)
hw->mac.get_link_status = 1;
- if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
- !test_bit(__IXGBEVF_REMOVING, &adapter->state))
- mod_timer(&adapter->watchdog_timer, jiffies);
+ ixgbevf_service_event_schedule(adapter);
IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, adapter->eims_other);
@@ -2051,7 +2074,7 @@ static void ixgbevf_up_complete(struct ixgbevf_adapter *adapter)
ixgbevf_init_last_counter_stats(adapter);
hw->mac.get_link_status = 1;
- mod_timer(&adapter->watchdog_timer, jiffies);
+ mod_timer(&adapter->service_timer, jiffies);
}
void ixgbevf_up(struct ixgbevf_adapter *adapter)
@@ -2177,13 +2200,7 @@ void ixgbevf_down(struct ixgbevf_adapter *adapter)
ixgbevf_napi_disable_all(adapter);
- del_timer_sync(&adapter->watchdog_timer);
-
- /* can't call flush scheduled work here because it can deadlock
- * if linkwatch_event tries to acquire the rtnl_lock which we are
- * holding */
- while (adapter->flags & IXGBE_FLAG_IN_WATCHDOG_TASK)
- msleep(1);
+ del_timer_sync(&adapter->service_timer);
/* disable transmits in the hardware now that interrupts are off */
for (i = 0; i < adapter->num_tx_queues; i++) {
@@ -2711,22 +2728,25 @@ void ixgbevf_update_stats(struct ixgbevf_adapter *adapter)
}
/**
- * ixgbevf_watchdog - Timer Call-back
+ * ixgbevf_service_timer - Timer Call-back
* @data: pointer to adapter cast into an unsigned long
**/
-static void ixgbevf_watchdog(unsigned long data)
+static void ixgbevf_service_timer(unsigned long data)
{
struct ixgbevf_adapter *adapter = (struct ixgbevf_adapter *)data;
- /* Do the reset outside of interrupt context */
- schedule_work(&adapter->watchdog_task);
+ /* Reset the timer */
+ mod_timer(&adapter->service_timer, (HZ * 2) + jiffies);
+
+ ixgbevf_service_event_schedule(adapter);
}
-static void ixgbevf_reset_task(struct work_struct *work)
+static void ixgbevf_reset_subtask(struct ixgbevf_adapter *adapter)
{
- struct ixgbevf_adapter *adapter;
+ if (!(adapter->flags & IXGBEVF_FLAG_RESET_REQUESTED))
+ return;
- adapter = container_of(work, struct ixgbevf_adapter, reset_task);
+ adapter->flags &= ~IXGBEVF_FLAG_RESET_REQUESTED;
/* If we're already down or resetting, just bail */
if (test_bit(__IXGBEVF_DOWN, &adapter->state) ||
@@ -2766,6 +2786,7 @@ static void ixgbevf_check_hang_subtask(struct ixgbevf_adapter *adapter)
/* get one bit for every active tx/rx interrupt vector */
for (i = 0; i < adapter->num_msix_vectors - NON_Q_VECTORS; i++) {
struct ixgbevf_q_vector *qv = adapter->q_vector[i];
+
if (qv->rx.ring || qv->tx.ring)
eics |= 1 << i;
}
@@ -2793,7 +2814,7 @@ static void ixgbevf_watchdog_update_link(struct ixgbevf_adapter *adapter)
/* if check for link returns error we will need to reset */
if (err && time_after(jiffies, adapter->last_reset + (10 * HZ))) {
- schedule_work(&adapter->reset_task);
+ adapter->flags |= IXGBEVF_FLAG_RESET_REQUESTED;
link_up = false;
}
@@ -2847,14 +2868,35 @@ static void ixgbevf_watchdog_link_is_down(struct ixgbevf_adapter *adapter)
}
/**
- * ixgbevf_watchdog_task - worker thread to bring link up
+ * ixgbevf_watchdog_subtask - worker thread to bring link up
+ * @work: pointer to work_struct containing our data
+ **/
+static void ixgbevf_watchdog_subtask(struct ixgbevf_adapter *adapter)
+{
+ /* if interface is down do nothing */
+ if (test_bit(__IXGBEVF_DOWN, &adapter->state) ||
+ test_bit(__IXGBEVF_RESETTING, &adapter->state))
+ return;
+
+ ixgbevf_watchdog_update_link(adapter);
+
+ if (adapter->link_up)
+ ixgbevf_watchdog_link_is_up(adapter);
+ else
+ ixgbevf_watchdog_link_is_down(adapter);
+
+ ixgbevf_update_stats(adapter);
+}
+
+/**
+ * ixgbevf_service_task - manages and runs subtasks
* @work: pointer to work_struct containing our data
**/
-static void ixgbevf_watchdog_task(struct work_struct *work)
+static void ixgbevf_service_task(struct work_struct *work)
{
struct ixgbevf_adapter *adapter = container_of(work,
struct ixgbevf_adapter,
- watchdog_task);
+ service_task);
struct ixgbe_hw *hw = &adapter->hw;
if (IXGBE_REMOVED(hw->hw_addr)) {
@@ -2867,27 +2909,11 @@ static void ixgbevf_watchdog_task(struct work_struct *work)
}
ixgbevf_queue_reset_subtask(adapter);
-
- adapter->flags |= IXGBE_FLAG_IN_WATCHDOG_TASK;
-
- ixgbevf_watchdog_update_link(adapter);
-
- if (adapter->link_up)
- ixgbevf_watchdog_link_is_up(adapter);
- else
- ixgbevf_watchdog_link_is_down(adapter);
-
- ixgbevf_update_stats(adapter);
-
+ ixgbevf_reset_subtask(adapter);
+ ixgbevf_watchdog_subtask(adapter);
ixgbevf_check_hang_subtask(adapter);
- /* Reset the timer */
- if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
- !test_bit(__IXGBEVF_REMOVING, &adapter->state))
- mod_timer(&adapter->watchdog_timer,
- round_jiffies(jiffies + (2 * HZ)));
-
- adapter->flags &= ~IXGBE_FLAG_IN_WATCHDOG_TASK;
+ ixgbevf_service_event_complete(adapter);
}
/**
@@ -3994,17 +4020,17 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev->priv_flags |= IFF_UNICAST_FLT;
- init_timer(&adapter->watchdog_timer);
- adapter->watchdog_timer.function = ixgbevf_watchdog;
- adapter->watchdog_timer.data = (unsigned long)adapter;
-
if (IXGBE_REMOVED(hw->hw_addr)) {
err = -EIO;
goto err_sw_init;
}
- INIT_WORK(&adapter->reset_task, ixgbevf_reset_task);
- INIT_WORK(&adapter->watchdog_task, ixgbevf_watchdog_task);
- set_bit(__IXGBEVF_WORK_INIT, &adapter->state);
+
+ setup_timer(&adapter->service_timer, &ixgbevf_service_timer,
+ (unsigned long)adapter);
+
+ INIT_WORK(&adapter->service_task, ixgbevf_service_task);
+ set_bit(__IXGBEVF_SERVICE_INITED, &adapter->state);
+ clear_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state);
err = ixgbevf_init_interrupt_scheme(adapter);
if (err)
@@ -4078,11 +4104,7 @@ static void ixgbevf_remove(struct pci_dev *pdev)
adapter = netdev_priv(netdev);
set_bit(__IXGBEVF_REMOVING, &adapter->state);
-
- del_timer_sync(&adapter->watchdog_timer);
-
- cancel_work_sync(&adapter->reset_task);
- cancel_work_sync(&adapter->watchdog_task);
+ cancel_work_sync(&adapter->service_task);
if (netdev->reg_state == NETREG_REGISTERED)
unregister_netdev(netdev);
@@ -4116,7 +4138,7 @@ static pci_ers_result_t ixgbevf_io_error_detected(struct pci_dev *pdev,
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgbevf_adapter *adapter = netdev_priv(netdev);
- if (!test_bit(__IXGBEVF_WORK_INIT, &adapter->state))
+ if (!test_bit(__IXGBEVF_SERVICE_INITED, &adapter->state))
return PCI_ERS_RESULT_DISCONNECT;
rtnl_lock();