[net-next 16/20] fm10k: check if PCIe link is restored
From: Jeff Kirsher <hidden>
Date: 2016-07-20 22:24:08
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Jacob Keller <jacob.e.keller@intel.com> 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 <redacted> Signed-off-by: Jeff Kirsher <redacted> --- drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index 5e40460..d4ccb2a 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))
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2.5.5