[PATCH 2/2] nvme: start keep alive timer when enabling the controller

[maxg@mellanox.com (Max Gurtovoy)]

On 4/15/2018 11:47 AM, Sagi Grimberg wrote:
> From: Max Gurtuvoy <maxg at mellanox.com>
> 
> We start the keep alive timer after all the I/O queues were
> created, this might be too late as the controller might have
> start its keep alive timer when it was enabled. Hence, start
> it right after controller enable was completed.
> 
> We stop the keep alive in nvme_stop_ctrl as its before the
> disable/shutdown and its independent of the transport connectivity.
> 

Christoph suggested to add the keep-alive stop to the disable/shutdown 
(I guess we need to add it to both, right ?) and in the target side to 
start expecting also once ctrl is enabled and stop when disabled.

Would you like me to send another version ? This one should also change 
the FC code since there is no use in nvme_disable_ctrl...


> Suggested-by: Max Gurtuvoy <maxg at mellanox.com>
> Suggested-by: James Smart <james.smart at broadcom.com>
> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> ---
>   drivers/nvme/host/core.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index e1b708ee6783..4b5c3f7addeb 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1739,7 +1739,14 @@ int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
>   	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
>   	if (ret)
>   		return ret;
> -	return nvme_wait_ready(ctrl, cap, true);
> +
> +	ret = nvme_wait_ready(ctrl, cap, true);
> +	if (ret)
> +		return ret;
> +
> +	nvme_start_keep_alive(ctrl);
> +
> +	return 0;
>   }
>   EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
>   
> @@ -3393,9 +3400,6 @@ EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
>   
>   void nvme_start_ctrl(struct nvme_ctrl *ctrl)
>   {
> -	if (ctrl->kato)
> -		nvme_start_keep_alive(ctrl);
> -
>   	if (ctrl->queue_count > 1) {
>   		nvme_queue_scan(ctrl);
>   		queue_work(nvme_wq, &ctrl->async_event_work);
>