From: Tariq Toukan <[email protected]> Date: Mon, 30 Jan 2017 15:11:45 +0200
> From: Jack Morgenstein <[email protected]> > > 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. > > The result is that the VF driver on the VM will experience a command > timeout during the shutdown process when the Hypervisor does not deliver > a command-completion event to the VM. > > To avoid FW command timeouts on the VM when the driver's shutdown method > is invoked, we detect the absence of the VF's comm channel at the very > start of the shutdown process. If the comm-channel has already been > disabled, we cause all FW commands during the device shutdown process to > immediately return success (and thus avoid all command timeouts). > > Signed-off-by: Jack Morgenstein <[email protected]> > Signed-off-by: Tariq Toukan <[email protected]> Applied, thanks.
