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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1672785

Title:
  [Hyper-V][Mellanox] net/mlx4_core: Avoid delays during VF driver
  device shutdown

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  Mellanox has submitted the following patch upstream that's important
  for SR-IOV in Azure.

  Please integrate it into the Mellanox mlx4 drivers for lts-xenial,
  HWE, Zesty, and Azure custom.

  https://patchwork.ozlabs.org/patch/738305/

  From: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>

  Some Hypervisors detach VFs from VMs by instantly causing an FLR event
  to be generated for a VF.

  In the mlx4 case, this will cause that VF's comm channel to be disabled
  before the VM has an opportunity to invoke the VF device's "shutdown"
  method.

  For such Hypervisors, there is a race condition between the VF's
  shutdown method and its internal-error detection/reset thread.

  The internal-error detection/reset thread (which runs every 5 seconds) also
  detects a disabled comm channel. If the internal-error detection/reset
  flow wins the race, we still get delays (while that flow tries repeatedly
  to detect comm-channel recovery).

  The cited commit fixed the command timeout problem when the
  internal-error detection/reset flow loses the race.

  This commit avoids the unneeded delays when the internal-error
  detection/reset flow wins.

  Fixes: d585df1c5ccf ("net/mlx4_core: Avoid command timeouts during VF driver device shutdown")
  Signed-off-by: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>
  Reported-by: Simon Xiao <sixiao@xxxxxxxxxxxxx>
  Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
  ---
   drivers/net/ethernet/mellanox/mlx4/cmd.c  | 11 +++++++++++
   drivers/net/ethernet/mellanox/mlx4/main.c | 11 +++++++++++
   include/linux/mlx4/device.h               |  1 +
   3 files changed, 23 insertions(+)

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