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fm10k: check if PCIe link is restored

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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>
This commit is contained in:
Jacob Keller 2016-06-07 16:08:58 -07:00 committed by Jeff Kirsher
parent 0d63a8f50e
commit 9d7dbf0604
1 changed files with 13 additions and 0 deletions
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13
drivers/net/ethernet/intel/fm10k/fm10k_pci.c
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@ -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))