fm10k: check if PCIe link is restored
Sometimes, a VF driver will lose PCIe address access, such as due to a PF FLR event. In fm10k_detach_subtask, poll and check whether the PCIe register space is active again and restore the device when it has. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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@ -123,11 +123,24 @@ static void fm10k_service_timer(unsigned long data)
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static void fm10k_detach_subtask(struct fm10k_intfc *interface)
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{
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struct net_device *netdev = interface->netdev;
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u32 __iomem *hw_addr;
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u32 value;
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/* do nothing if device is still present or hw_addr is set */
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if (netif_device_present(netdev) || interface->hw.hw_addr)
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return;
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/* check the real address space to see if we've recovered */
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hw_addr = READ_ONCE(interface->uc_addr);
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value = readl(hw_addr);
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if ((~value)) {
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interface->hw.hw_addr = interface->uc_addr;
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netif_device_attach(netdev);
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interface->flags |= FM10K_FLAG_RESET_REQUESTED;
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netdev_warn(netdev, "PCIe link restored, device now attached\n");
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return;
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}
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rtnl_lock();
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if (netif_running(netdev))
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