From: Tariq Toukan <tar...@mellanox.com>
Date: Mon, 13 Mar 2017 19:29:08 +0200
> From: Jack Morgenstein <ja...@dev.mellanox.co.il>
>
> 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 <ja...@dev.mellanox.co.il>
> Reported-by: Simon Xiao <six...@microsoft.com>
> Signed-off-by: Tariq Toukan <tar...@mellanox.com>
Applied.
