netdev - Re: [PATCH net 1/1] igc: Fix double reset adapter triggered from a single taprio cmd

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Date: Wed, 26 Jun 2024 15:29:47 -0700
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jesse Brandeburg
 <jesse.brandeburg@...el.com>, Tony
 Nguyen <anthony.l.nguyen@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, Faizal Rahim
 <faizal.abdul.rahim@...ux.intel.com>
Subject: Re: [PATCH net 1/1] igc: Fix double reset adapter triggered from a
 single taprio cmd

Faizal Rahim <faizal.abdul.rahim@...ux.intel.com> writes:

> Following the implementation of "igc: Add TransmissionOverrun counter"
> patch, when a taprio command is triggered by user, igc processes two
> commands: TAPRIO_CMD_REPLACE followed by TAPRIO_CMD_STATS. However, both
> commands unconditionally pass through igc_tsn_offload_apply() which
> evaluates and triggers reset adapter. The double reset causes issues in
> the calculation of adapter->qbv_count in igc.
>
> TAPRIO_CMD_REPLACE command is expected to reset the adapter since it
> activates qbv. It's unexpected for TAPRIO_CMD_STATS to do the same
> because it doesn't configure any driver-specific TSN settings. So, the
> evaluation in igc_tsn_offload_apply() isn't needed for TAPRIO_CMD_STATS.
>
> To address this, commands parsing are relocated to
> igc_tsn_enable_qbv_scheduling(). Commands that don't require an adapter
> reset will exit after processing, thus avoiding igc_tsn_offload_apply().
>
> Fixes: d3750076d464 ("igc: Add TransmissionOverrun counter")
> Signed-off-by: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_main.c | 33 ++++++++++++-----------
>  1 file changed, 17 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index 87b655b839c1..33069880c86c 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -6310,21 +6310,6 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
>  	size_t n;
>  	int i;
>
> -	switch (qopt->cmd) {
> -	case TAPRIO_CMD_REPLACE:
> -		break;
> -	case TAPRIO_CMD_DESTROY:
> -		return igc_tsn_clear_schedule(adapter);
> -	case TAPRIO_CMD_STATS:
> -		igc_taprio_stats(adapter->netdev, &qopt->stats);
> -		return 0;
> -	case TAPRIO_CMD_QUEUE_STATS:
> -		igc_taprio_queue_stats(adapter->netdev, &qopt->queue_stats);
> -		return 0;
> -	default:
> -		return -EOPNOTSUPP;
> -	}
> -
>  	if (qopt->base_time < 0)
>  		return -ERANGE;
>
> @@ -6433,7 +6418,23 @@ static int igc_tsn_enable_qbv_scheduling(struct igc_adapter *adapter,
>  	if (hw->mac.type != igc_i225)
>  		return -EOPNOTSUPP;
>
> -	err = igc_save_qbv_schedule(adapter, qopt);
> +	switch (qopt->cmd) {
> +	case TAPRIO_CMD_REPLACE:
> +		err = igc_save_qbv_schedule(adapter, qopt);
> +		break;
> +	case TAPRIO_CMD_DESTROY:
> +		err = igc_tsn_clear_schedule(adapter);
> +		break;
> +	case TAPRIO_CMD_STATS:
> +		igc_taprio_stats(adapter->netdev, &qopt->stats);
> +		return 0;
> +	case TAPRIO_CMD_QUEUE_STATS:
> +		igc_taprio_queue_stats(adapter->netdev, &qopt->queue_stats);
> +		return 0;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +

Yeah, moving the command parsing to be done earlier sounds like the
right fix:

Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>


>  	if (err)
>  		return err;
>
> --
> 2.25.1
>

-- 
Vinicius