netdev - Re: [PATCH net-next 3/6] ionic: add lif quiesce

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Date:   Wed, 04 Nov 2020 16:50:05 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Shannon Nelson <snelson@...sando.io>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH net-next 3/6] ionic: add lif quiesce

On Wed, 2020-11-04 at 14:33 -0800, Shannon Nelson wrote:
> After the queues are stopped, expressly quiesce the lif.
> This assures that even if the queues were in an odd state,
> the firmware will close up everything cleanly.
> 
> Signed-off-by: Shannon Nelson <snelson@...sando.io>
> ---
>  .../net/ethernet/pensando/ionic/ionic_lif.c   | 24
> +++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
> b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
> index 519d544821af..28044240caf2 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
> @@ -1625,6 +1625,28 @@ static void ionic_lif_rss_deinit(struct
> ionic_lif *lif)
>  	ionic_lif_rss_config(lif, 0x0, NULL, NULL);
>  }
>  
> +static int ionic_lif_quiesce(struct ionic_lif *lif)
> +{
> +	struct ionic_admin_ctx ctx = {
> +		.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
> +		.cmd.lif_setattr = {
> +			.opcode = IONIC_CMD_LIF_SETATTR,
> +			.index = cpu_to_le16(lif->index),
> +			.attr = IONIC_LIF_ATTR_STATE,
> +			.state = IONIC_LIF_QUIESCE,
> +		},
> +	};
> +	int err;
> +
> +	err = ionic_adminq_post_wait(lif, &ctx);
> +	if (err) {
> +		netdev_err(lif->netdev, "lif quiesce failed %d\n",
> err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
>  static void ionic_txrx_disable(struct ionic_lif *lif)
>  {
>  	unsigned int i;
> @@ -1639,6 +1661,8 @@ static void ionic_txrx_disable(struct ionic_lif
> *lif)
>  		for (i = 0; i < lif->nxqs; i++)
>  			err = ionic_qcq_disable(lif->rxqcqs[i], (err !=
> -ETIMEDOUT));
>  	}
> +
> +	ionic_lif_quiesce(lif);

if you don't care about return value just void out the function retval