diff options
Diffstat (limited to 'drivers/net/ethernet/intel/fm10k/fm10k_pci.c')
| -rw-r--r-- | drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 322 |
1 files changed, 189 insertions, 133 deletions
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index e05aca9bef0e..b8245c734c96 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -123,11 +123,24 @@ static void fm10k_service_timer(unsigned long data) static void fm10k_detach_subtask(struct fm10k_intfc *interface) { struct net_device *netdev = interface->netdev; + u32 __iomem *hw_addr; + u32 value; /* do nothing if device is still present or hw_addr is set */ if (netif_device_present(netdev) || interface->hw.hw_addr) return; + /* check the real address space to see if we've recovered */ + hw_addr = READ_ONCE(interface->uc_addr); + value = readl(hw_addr); + if ((~value)) { + interface->hw.hw_addr = interface->uc_addr; + netif_device_attach(netdev); + interface->flags |= FM10K_FLAG_RESET_REQUESTED; + netdev_warn(netdev, "PCIe link restored, device now attached\n"); + return; + } + rtnl_lock(); if (netif_running(netdev)) @@ -136,11 +149,9 @@ static void fm10k_detach_subtask(struct fm10k_intfc *interface) rtnl_unlock(); } -static void fm10k_reinit(struct fm10k_intfc *interface) +static void fm10k_prepare_for_reset(struct fm10k_intfc *interface) { struct net_device *netdev = interface->netdev; - struct fm10k_hw *hw = &interface->hw; - int err; WARN_ON(in_interrupt()); @@ -165,6 +176,19 @@ static void fm10k_reinit(struct fm10k_intfc *interface) /* delay any future reset requests */ interface->last_reset = jiffies + (10 * HZ); + rtnl_unlock(); +} + +static int fm10k_handle_reset(struct fm10k_intfc *interface) +{ + struct net_device *netdev = interface->netdev; + struct fm10k_hw *hw = &interface->hw; + int err; + + rtnl_lock(); + + pci_set_master(interface->pdev); + /* reset and initialize the hardware so it is in a known state */ err = hw->mac.ops.reset_hw(hw); if (err) { @@ -185,7 +209,7 @@ static void fm10k_reinit(struct fm10k_intfc *interface) goto reinit_err; } - /* reassociate interrupts */ + /* re-associate interrupts */ err = fm10k_mbx_request_irq(interface); if (err) goto err_mbx_irq; @@ -219,7 +243,7 @@ static void fm10k_reinit(struct fm10k_intfc *interface) clear_bit(__FM10K_RESETTING, &interface->state); - return; + return err; err_open: fm10k_mbx_free_irq(interface); err_mbx_irq: @@ -230,6 +254,20 @@ reinit_err: rtnl_unlock(); clear_bit(__FM10K_RESETTING, &interface->state); + + return err; +} + +static void fm10k_reinit(struct fm10k_intfc *interface) +{ + int err; + + fm10k_prepare_for_reset(interface); + + err = fm10k_handle_reset(interface); + if (err) + dev_err(&interface->pdev->dev, + "fm10k_handle_reset failed: %d\n", err); } static void fm10k_reset_subtask(struct fm10k_intfc *interface) @@ -372,12 +410,19 @@ void fm10k_update_stats(struct fm10k_intfc *interface) u64 bytes, pkts; int i; + /* ensure only one thread updates stats at a time */ + if (test_and_set_bit(__FM10K_UPDATING_STATS, &interface->state)) + return; + /* do not allow stats update via service task for next second */ interface->next_stats_update = jiffies + HZ; /* gather some stats to the interface struct that are per queue */ for (bytes = 0, pkts = 0, i = 0; i < interface->num_tx_queues; i++) { - struct fm10k_ring *tx_ring = interface->tx_ring[i]; + struct fm10k_ring *tx_ring = READ_ONCE(interface->tx_ring[i]); + + if (!tx_ring) + continue; restart_queue += tx_ring->tx_stats.restart_queue; tx_busy += tx_ring->tx_stats.tx_busy; @@ -396,7 +441,10 @@ void fm10k_update_stats(struct fm10k_intfc *interface) /* gather some stats to the interface struct that are per queue */ for (bytes = 0, pkts = 0, i = 0; i < interface->num_rx_queues; i++) { - struct fm10k_ring *rx_ring = interface->rx_ring[i]; + struct fm10k_ring *rx_ring = READ_ONCE(interface->rx_ring[i]); + + if (!rx_ring) + continue; bytes += rx_ring->stats.bytes; pkts += rx_ring->stats.packets; @@ -443,6 +491,8 @@ void fm10k_update_stats(struct fm10k_intfc *interface) /* Fill out the OS statistics structure */ net_stats->rx_errors = rx_errors; net_stats->rx_dropped = interface->stats.nodesc_drop.count; + + clear_bit(__FM10K_UPDATING_STATS, &interface->state); } /** @@ -1566,6 +1616,9 @@ void fm10k_up(struct fm10k_intfc *interface) /* configure interrupts */ hw->mac.ops.update_int_moderator(hw); + /* enable statistics capture again */ + clear_bit(__FM10K_UPDATING_STATS, &interface->state); + /* clear down bit to indicate we are ready to go */ clear_bit(__FM10K_DOWN, &interface->state); @@ -1598,10 +1651,11 @@ void fm10k_down(struct fm10k_intfc *interface) { struct net_device *netdev = interface->netdev; struct fm10k_hw *hw = &interface->hw; - int err; + int err, i = 0, count = 0; /* signal that we are down to the interrupt handler and service task */ - set_bit(__FM10K_DOWN, &interface->state); + if (test_and_set_bit(__FM10K_DOWN, &interface->state)) + return; /* call carrier off first to avoid false dev_watchdog timeouts */ netif_carrier_off(netdev); @@ -1613,18 +1667,57 @@ void fm10k_down(struct fm10k_intfc *interface) /* reset Rx filters */ fm10k_reset_rx_state(interface); - /* allow 10ms for device to quiesce */ - usleep_range(10000, 20000); - /* disable polling routines */ fm10k_napi_disable_all(interface); /* capture stats one last time before stopping interface */ fm10k_update_stats(interface); + /* prevent updating statistics while we're down */ + while (test_and_set_bit(__FM10K_UPDATING_STATS, &interface->state)) + usleep_range(1000, 2000); + + /* skip waiting for TX DMA if we lost PCIe link */ + if (FM10K_REMOVED(hw->hw_addr)) + goto skip_tx_dma_drain; + + /* In some rare circumstances it can take a while for Tx queues to + * quiesce and be fully disabled. Attempt to .stop_hw() first, and + * then if we get ERR_REQUESTS_PENDING, go ahead and wait in a loop + * until the Tx queues have emptied, or until a number of retries. If + * we fail to clear within the retry loop, we will issue a warning + * indicating that Tx DMA is probably hung. Note this means we call + * .stop_hw() twice but this shouldn't cause any problems. + */ + err = hw->mac.ops.stop_hw(hw); + if (err != FM10K_ERR_REQUESTS_PENDING) + goto skip_tx_dma_drain; + +#define TX_DMA_DRAIN_RETRIES 25 + for (count = 0; count < TX_DMA_DRAIN_RETRIES; count++) { + usleep_range(10000, 20000); + + /* start checking at the last ring to have pending Tx */ + for (; i < interface->num_tx_queues; i++) + if (fm10k_get_tx_pending(interface->tx_ring[i])) + break; + + /* if all the queues are drained, we can break now */ + if (i == interface->num_tx_queues) + break; + } + + if (count >= TX_DMA_DRAIN_RETRIES) + dev_err(&interface->pdev->dev, + "Tx queues failed to drain after %d tries. Tx DMA is probably hung.\n", + count); +skip_tx_dma_drain: /* Disable DMA engine for Tx/Rx */ err = hw->mac.ops.stop_hw(hw); - if (err) + if (err == FM10K_ERR_REQUESTS_PENDING) + dev_err(&interface->pdev->dev, + "due to pending requests hw was not shut down gracefully\n"); + else if (err) dev_err(&interface->pdev->dev, "stop_hw failed: %d\n", err); /* free any buffers still on the rings */ @@ -1750,6 +1843,7 @@ static int fm10k_sw_init(struct fm10k_intfc *interface, /* Start off interface as being down */ set_bit(__FM10K_DOWN, &interface->state); + set_bit(__FM10K_UPDATING_STATS, &interface->state); return 0; } @@ -2033,6 +2127,48 @@ static void fm10k_remove(struct pci_dev *pdev) pci_disable_device(pdev); } +static void fm10k_prepare_suspend(struct fm10k_intfc *interface) +{ + /* the watchdog task reads from registers, which might appear like + * a surprise remove if the PCIe device is disabled while we're + * stopped. We stop the watchdog task until after we resume software + * activity. + */ + set_bit(__FM10K_SERVICE_DISABLE, &interface->state); + cancel_work_sync(&interface->service_task); + + fm10k_prepare_for_reset(interface); +} + +static int fm10k_handle_resume(struct fm10k_intfc *interface) +{ + struct fm10k_hw *hw = &interface->hw; + int err; + + /* reset statistics starting values */ + hw->mac.ops.rebind_hw_stats(hw, &interface->stats); + + err = fm10k_handle_reset(interface); + if (err) + return err; + + /* assume host is not ready, to prevent race with watchdog in case we + * actually don't have connection to the switch + */ + interface->host_ready = false; + fm10k_watchdog_host_not_ready(interface); + + /* force link to stay down for a second to prevent link flutter */ + interface->link_down_event = jiffies + (HZ); + set_bit(__FM10K_LINK_DOWN, &interface->state); + + /* clear the service task disable bit to allow service task to start */ + clear_bit(__FM10K_SERVICE_DISABLE, &interface->state); + fm10k_service_event_schedule(interface); + + return err; +} + #ifdef CONFIG_PM /** * fm10k_resume - Restore device to pre-sleep state @@ -2069,60 +2205,13 @@ static int fm10k_resume(struct pci_dev *pdev) /* refresh hw_addr in case it was dropped */ hw->hw_addr = interface->uc_addr; - /* reset hardware to known state */ - err = hw->mac.ops.init_hw(&interface->hw); - if (err) { - dev_err(&pdev->dev, "init_hw failed: %d\n", err); - return err; - } - - /* reset statistics starting values */ - hw->mac.ops.rebind_hw_stats(hw, &interface->stats); - - rtnl_lock(); - - err = fm10k_init_queueing_scheme(interface); - if (err) - goto err_queueing_scheme; - - err = fm10k_mbx_request_irq(interface); - if (err) - goto err_mbx_irq; - - err = fm10k_hw_ready(interface); + err = fm10k_handle_resume(interface); if (err) - goto err_open; - - err = netif_running(netdev) ? fm10k_open(netdev) : 0; - if (err) - goto err_open; - - rtnl_unlock(); - - /* assume host is not ready, to prevent race with watchdog in case we - * actually don't have connection to the switch - */ - interface->host_ready = false; - fm10k_watchdog_host_not_ready(interface); - - /* clear the service task disable bit to allow service task to start */ - clear_bit(__FM10K_SERVICE_DISABLE, &interface->state); - fm10k_service_event_schedule(interface); - - /* restore SR-IOV interface */ - fm10k_iov_resume(pdev); + return err; netif_device_attach(netdev); return 0; -err_open: - fm10k_mbx_free_irq(interface); -err_mbx_irq: - fm10k_clear_queueing_scheme(interface); -err_queueing_scheme: - rtnl_unlock(); - - return err; } /** @@ -2142,27 +2231,7 @@ static int fm10k_suspend(struct pci_dev *pdev, netif_device_detach(netdev); - fm10k_iov_suspend(pdev); - - /* the watchdog tasks may read registers, which will appear like a - * surprise-remove event once the PCI device is disabled. This will - * cause us to close the netdevice, so we don't retain the open/closed - * state post-resume. Prevent this by disabling the service task while - * suspended, until we actually resume. - */ - set_bit(__FM10K_SERVICE_DISABLE, &interface->state); - cancel_work_sync(&interface->service_task); - - rtnl_lock(); - - if (netif_running(netdev)) - fm10k_close(netdev); - - fm10k_mbx_free_irq(interface); - - fm10k_clear_queueing_scheme(interface); - - rtnl_unlock(); + fm10k_prepare_suspend(interface); err = pci_save_state(pdev); if (err) @@ -2195,17 +2264,7 @@ static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev, if (state == pci_channel_io_perm_failure) return PCI_ERS_RESULT_DISCONNECT; - rtnl_lock(); - - if (netif_running(netdev)) - fm10k_close(netdev); - - fm10k_mbx_free_irq(interface); - - /* free interrupts */ - fm10k_clear_queueing_scheme(interface); - - rtnl_unlock(); + fm10k_prepare_suspend(interface); /* Request a slot reset. */ return PCI_ERS_RESULT_NEED_RESET; @@ -2219,7 +2278,6 @@ static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev, */ static pci_ers_result_t fm10k_io_slot_reset(struct pci_dev *pdev) { - struct fm10k_intfc *interface = pci_get_drvdata(pdev); pci_ers_result_t result; if (pci_enable_device_mem(pdev)) { @@ -2237,12 +2295,6 @@ static pci_ers_result_t fm10k_io_slot_reset(struct pci_dev *pdev) pci_wake_from_d3(pdev, false); - /* refresh hw_addr in case it was dropped */ - interface->hw.hw_addr = interface->uc_addr; - - interface->flags |= FM10K_FLAG_RESET_REQUESTED; - fm10k_service_event_schedule(interface); - result = PCI_ERS_RESULT_RECOVERED; } @@ -2262,50 +2314,54 @@ static void fm10k_io_resume(struct pci_dev *pdev) { struct fm10k_intfc *interface = pci_get_drvdata(pdev); struct net_device *netdev = interface->netdev; - struct fm10k_hw *hw = &interface->hw; - int err = 0; - - /* reset hardware to known state */ - err = hw->mac.ops.init_hw(&interface->hw); - if (err) { - dev_err(&pdev->dev, "init_hw failed: %d\n", err); - return; - } - - /* reset statistics starting values */ - hw->mac.ops.rebind_hw_stats(hw, &interface->stats); - - rtnl_lock(); + int err; - err = fm10k_init_queueing_scheme(interface); - if (err) { - dev_err(&interface->pdev->dev, - "init_queueing_scheme failed: %d\n", err); - goto unlock; - } + err = fm10k_handle_resume(interface); - /* reassociate interrupts */ - fm10k_mbx_request_irq(interface); + if (err) + dev_warn(&pdev->dev, + "fm10k_io_resume failed: %d\n", err); + else + netif_device_attach(netdev); +} - rtnl_lock(); - if (netif_running(netdev)) - err = fm10k_open(netdev); - rtnl_unlock(); +/** + * fm10k_io_reset_notify - called when PCI function is reset + * @pdev: Pointer to PCI device + * + * This callback is called when the PCI function is reset such as from + * /sys/class/net/<enpX>/device/reset or similar. When prepare is true, it + * means we should prepare for a function reset. If prepare is false, it means + * the function reset just occurred. + */ +static void fm10k_io_reset_notify(struct pci_dev *pdev, bool prepare) +{ + struct fm10k_intfc *interface = pci_get_drvdata(pdev); + int err = 0; - /* final check of hardware state before registering the interface */ - err = err ? : fm10k_hw_ready(interface); + if (prepare) { + /* warn incase we have any active VF devices */ + if (pci_num_vf(pdev)) + dev_warn(&pdev->dev, + "PCIe FLR may cause issues for any active VF devices\n"); - if (!err) - netif_device_attach(netdev); + fm10k_prepare_suspend(interface); + } else { + err = fm10k_handle_resume(interface); + } -unlock: - rtnl_unlock(); + if (err) { + dev_warn(&pdev->dev, + "fm10k_io_reset_notify failed: %d\n", err); + netif_device_detach(interface->netdev); + } } static const struct pci_error_handlers fm10k_err_handler = { .error_detected = fm10k_io_error_detected, .slot_reset = fm10k_io_slot_reset, .resume = fm10k_io_resume, + .reset_notify = fm10k_io_reset_notify, }; static struct pci_driver fm10k_driver = { |