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

drivers/net/ethernet/intel/fm10k/fm10k_pci.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -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))