Commit 9d7dbf06 authored by Jacob Keller's avatar Jacob Keller Committed by Jeff Kirsher

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: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 0d63a8f5
...@@ -123,11 +123,24 @@ static void fm10k_service_timer(unsigned long data) ...@@ -123,11 +123,24 @@ static void fm10k_service_timer(unsigned long data)
static void fm10k_detach_subtask(struct fm10k_intfc *interface) static void fm10k_detach_subtask(struct fm10k_intfc *interface)
{ {
struct net_device *netdev = interface->netdev; struct net_device *netdev = interface->netdev;
u32 __iomem *hw_addr;
u32 value;
/* do nothing if device is still present or hw_addr is set */ /* do nothing if device is still present or hw_addr is set */
if (netif_device_present(netdev) || interface->hw.hw_addr) if (netif_device_present(netdev) || interface->hw.hw_addr)
return; 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(); rtnl_lock();
if (netif_running(netdev)) if (netif_running(netdev))
......
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