diff options
| author | Jacob Keller <jacob.e.keller@intel.com> | 2016-06-08 02:08:58 +0300 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2016-07-21 01:22:15 +0300 |
| commit | 9d7dbf0604d37f8cae0c6d184a646037636a8b30 (patch) | |
| tree | e2190c3fbcff8ee43426e2eea110179a2d4fb272 /drivers/net/ethernet/intel/fm10k | |
| parent | 0d63a8f50e7a7810b0631cd8ea66d44dafb215e6 (diff) | |
| download | linux-9d7dbf0604d37f8cae0c6d184a646037636a8b30.tar.xz | |
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>
Diffstat (limited to 'drivers/net/ethernet/intel/fm10k')
| -rw-r--r-- | drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index 5e40460b041d..d4ccb2a0c585 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)) |