netdev - Re: [PATCH net 1/4] ice: Fix improper extts handling

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Date: Wed, 26 Jun 2024 15:36:00 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<edumazet@...gle.com>, <netdev@...r.kernel.org>, Milena Olech
	<milena.olech@...el.com>, <richardcochran@...il.com>, Przemek Kitszel
	<przemyslaw.kitszel@...el.com>, Jacob Keller <jacob.e.keller@...el.com>,
	Karol Kolacinski <karol.kolacinski@...el.com>, Simon Horman
	<horms@...nel.org>, Pucha Himasekhar Reddy
	<himasekharx.reddy.pucha@...el.com>
Subject: Re: [PATCH net 1/4] ice: Fix improper extts handling

On Tue, Jun 25, 2024 at 10:02:44AM -0700, Tony Nguyen wrote:
> From: Milena Olech <milena.olech@...el.com>
> 
> Extts events are disabled and enabled by the application ts2phc.
> However, in case where the driver is removed when the application is
> running, channel remains enabled. As a result, in the next run of the
> app, two channels are enabled and the information "extts on unexpected
> channel" is printed to the user.
> 
> To avoid that, extts events shall be disabled when PTP is released.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Co-developed-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Milena Olech <milena.olech@...el.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> Reviewed-by: Simon Horman <horms@...nel.org>
> Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 106 ++++++++++++++++++-----
>  drivers/net/ethernet/intel/ice/ice_ptp.h |   8 ++
>  2 files changed, 92 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 0f17fc1181d2..d8ff9f26010c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -1584,27 +1584,24 @@ void ice_ptp_extts_event(struct ice_pf *pf)

[...]

> +/**
> + * ice_ptp_disable_all_extts - Disable all EXTTS channels
> + * @pf: Board private structure
> + */
> +static void ice_ptp_disable_all_extts(struct ice_pf *pf)
> +{
> +	struct ice_extts_channel extts_cfg = {};
> +	int i;
> +
> +	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
> +		if (pf->ptp.extts_channels[i].ena) {
> +			extts_cfg.gpio_pin = pf->ptp.extts_channels[i].gpio_pin;
> +			extts_cfg.ena = false;
> +			ice_ptp_cfg_extts(pf, i, &extts_cfg, false);
> +		}
> +	}
> +
> +	synchronize_irq(pf->oicr_irq.virq);
> +}
> +
> +/**
> + * ice_ptp_enable_all_extts - Enable all EXTTS channels
> + * @pf: Board private structure
> + *
> + * Called during reset to restore user configuration.
> + */
> +static void ice_ptp_enable_all_extts(struct ice_pf *pf)
> +{
> +	int i;
> +
> +	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
> +		if (pf->ptp.extts_channels[i].ena) {
> +			ice_ptp_cfg_extts(pf, i, &pf->ptp.extts_channels[i],
> +					  false);
> +		}
> +	}

nit: you don't need braces for single line statements.

maybe you could rewrite it as below but i'm not sure if it's more
readable. up to you.

	int i, cnt = pf->ptp.info.n_ext_ts;

	for (i = 0; i < cnt && pf->ptp.extts_channels[i].ena; i++)
		ice_ptp_cfg_extts(pf, i, &pf->ptp.extts_channels[i], false);

>  }
>  

[...]