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net: ena: add power management ops to the ENA driver 

Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Netanel Belgazal 2017-10-17 07:33:58 +00:00 committed by David S. Miller
parent dbeaf1e3c2
commit 8c5c7abdeb
3 changed files with 96 additions and 28 deletions
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2
drivers/net/ethernet/amazon/ena/ena_ethtool.c
View File

@ -60,6 +60,8 @@ struct ena_stats {
static const struct ena_stats ena_stats_global_strings[] = {
ENA_STAT_GLOBAL_ENTRY(tx_timeout),
ENA_STAT_GLOBAL_ENTRY(suspend),
ENA_STAT_GLOBAL_ENTRY(resume),
ENA_STAT_GLOBAL_ENTRY(wd_expired),
ENA_STAT_GLOBAL_ENTRY(interface_up),
ENA_STAT_GLOBAL_ENTRY(interface_down),

119
drivers/net/ethernet/amazon/ena/ena_netdev.c
View File

@ -2529,38 +2529,31 @@ static int ena_enable_msix_and_set_admin_interrupts(struct ena_adapter *adapter,
return rc;
}
static void ena_fw_reset_device(struct work_struct *work)
static void ena_destroy_device(struct ena_adapter *adapter)
{
struct ena_com_dev_get_features_ctx get_feat_ctx;
struct ena_adapter *adapter =
container_of(work, struct ena_adapter, reset_task);
struct net_device *netdev = adapter->netdev;
struct ena_com_dev *ena_dev = adapter->ena_dev;
struct pci_dev *pdev = adapter->pdev;
bool dev_up, wd_state;
int rc;
if (unlikely(!test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
dev_err(&pdev->dev,
"device reset schedule while reset bit is off\n");
return;
}
bool dev_up;
netif_carrier_off(netdev);
del_timer_sync(&adapter->timer_service);
rtnl_lock();
dev_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
adapter->dev_up_before_reset = dev_up;
ena_com_set_admin_running_state(ena_dev, false);
/* After calling ena_close the tx queues and the napi
* are disabled so no one can interfere or touch the
* data structures
*/
ena_close(netdev);
/* Before releasing the ENA resources, a device reset is required.
* (to prevent the device from accessing them).
* In case the reset flag is set and the device is up, ena_close
* already perform the reset, so it can be skipped.
*/
if (!(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags) && dev_up))
ena_com_dev_reset(adapter->ena_dev, adapter->reset_reason);
ena_free_mgmnt_irq(adapter);
ena_disable_msix(adapter);
@ -2574,9 +2567,17 @@ static void ena_fw_reset_device(struct work_struct *work)
ena_com_mmio_reg_read_request_destroy(ena_dev);
adapter->reset_reason = ENA_REGS_RESET_NORMAL;
clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
/* Finish with the destroy part. Start the init part */
clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
}
static int ena_restore_device(struct ena_adapter *adapter)
{
struct ena_com_dev_get_features_ctx get_feat_ctx;
struct ena_com_dev *ena_dev = adapter->ena_dev;
struct pci_dev *pdev = adapter->pdev;
bool wd_state;
int rc;
rc = ena_device_init(ena_dev, adapter->pdev, &get_feat_ctx, &wd_state);
if (rc) {
@ -2598,7 +2599,7 @@ static void ena_fw_reset_device(struct work_struct *work)
goto err_device_destroy;
}
/* If the interface was up before the reset bring it up */
if (dev_up) {
if (adapter->dev_up_before_reset) {
rc = ena_up(adapter);
if (rc) {
dev_err(&pdev->dev, "Failed to create I/O queues\n");
@ -2607,24 +2608,38 @@ static void ena_fw_reset_device(struct work_struct *work)
}
mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
rtnl_unlock();
dev_err(&pdev->dev, "Device reset completed successfully\n");
return;
return rc;
err_disable_msix:
ena_free_mgmnt_irq(adapter);
ena_disable_msix(adapter);
err_device_destroy:
ena_com_admin_destroy(ena_dev);
err:
rtnl_unlock();
clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
dev_err(&pdev->dev,
"Reset attempt failed. Can not reset the device\n");
return rc;
}
static void ena_fw_reset_device(struct work_struct *work)
{
struct ena_adapter *adapter =
container_of(work, struct ena_adapter, reset_task);
struct pci_dev *pdev = adapter->pdev;
if (unlikely(!test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
dev_err(&pdev->dev,
"device reset schedule while reset bit is off\n");
return;
}
rtnl_lock();
ena_destroy_device(adapter);
ena_restore_device(adapter);
rtnl_unlock();
}
static int check_missing_comp_in_queue(struct ena_adapter *adapter,
@ -3378,11 +3393,59 @@ static void ena_remove(struct pci_dev *pdev)
vfree(ena_dev);
}
#ifdef CONFIG_PM
/* ena_suspend - PM suspend callback
* @pdev: PCI device information struct
* @state:power state
*/
static int ena_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct ena_adapter *adapter = pci_get_drvdata(pdev);
u64_stats_update_begin(&adapter->syncp);
adapter->dev_stats.suspend++;
u64_stats_update_end(&adapter->syncp);
rtnl_lock();
if (unlikely(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
dev_err(&pdev->dev,
"ignoring device reset request as the device is being suspended\n");
clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
}
ena_destroy_device(adapter);
rtnl_unlock();
return 0;
}
/* ena_resume - PM resume callback
* @pdev: PCI device information struct
*
*/
static int ena_resume(struct pci_dev *pdev)
{
struct ena_adapter *adapter = pci_get_drvdata(pdev);
int rc;
u64_stats_update_begin(&adapter->syncp);
adapter->dev_stats.resume++;
u64_stats_update_end(&adapter->syncp);
rtnl_lock();
rc = ena_restore_device(adapter);
rtnl_unlock();
return rc;
}
#endif
static struct pci_driver ena_pci_driver = {
.name = DRV_MODULE_NAME,
.id_table = ena_pci_tbl,
.probe = ena_probe,
.remove = ena_remove,
#ifdef CONFIG_PM
.suspend = ena_suspend,
.resume = ena_resume,
#endif
.sriov_configure = ena_sriov_configure,
};

3
drivers/net/ethernet/amazon/ena/ena_netdev.h
View File

@ -257,6 +257,8 @@ struct ena_ring {
struct ena_stats_dev {
u64 tx_timeout;
u64 suspend;
u64 resume;
u64 wd_expired;
u64 interface_up;
u64 interface_down;
@ -327,6 +329,7 @@ struct ena_adapter {
struct timer_list timer_service;
bool wd_state;
bool dev_up_before_reset;
unsigned long last_keep_alive_jiffies;
struct u64_stats_sync syncp;