netdev - Re: [PATCH iwl-next 1/2] ice: Schedule service task in IRQ top half

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Date: Mon, 27 Nov 2023 16:46:40 +0000
From: Simon Horman <horms@...nel.org>
To: Karol Kolacinski <karol.kolacinski@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, jesse.brandeburg@...el.com,
	Michal Michalik <michal.michalik@...el.com>
Subject: Re: [PATCH iwl-next 1/2] ice: Schedule service task in IRQ top half

On Fri, Nov 24, 2023 at 12:41:54PM +0100, Karol Kolacinski wrote:
> Schedule service task and EXTTS in the top half to avoid bottom half
> scheduling if possible, which significantly reduces timestamping delay.
> 
> Co-developed-by: Michal Michalik <michal.michalik@...el.com>
> Signed-off-by: Michal Michalik <michal.michalik@...el.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice.h      |  1 -
>  drivers/net/ethernet/intel/ice/ice_main.c | 18 ++++++++++--------
>  2 files changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
> index 3ea33947b878..d5a8da0c02c3 100644
> --- a/drivers/net/ethernet/intel/ice/ice.h
> +++ b/drivers/net/ethernet/intel/ice/ice.h
> @@ -517,7 +517,6 @@ enum ice_pf_flags {
>  };
>  
>  enum ice_misc_thread_tasks {
> -	ICE_MISC_THREAD_EXTTS_EVENT,
>  	ICE_MISC_THREAD_TX_TSTAMP,
>  	ICE_MISC_THREAD_NBITS		/* must be last */
>  };
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index 1f159b4362ec..6b91ec6f420d 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -3078,6 +3078,7 @@ static void ice_ena_misc_vector(struct ice_pf *pf)
>  static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
>  {
>  	struct ice_pf *pf = (struct ice_pf *)data;
> +	irqreturn_t ret = IRQ_HANDLED;
>  	struct ice_hw *hw = &pf->hw;
>  	struct device *dev;
>  	u32 oicr, ena_mask;
> @@ -3161,6 +3162,8 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
>  		ena_mask &= ~PFINT_OICR_TSYN_TX_M;
>  		if (ice_ptp_pf_handles_tx_interrupt(pf))

Hi Karol,

it seems that a trailing '{' is missing from the line above.

>  			set_bit(ICE_MISC_THREAD_TX_TSTAMP, pf->misc_thread);
> +			ret = IRQ_WAKE_THREAD;
> +		}
>  	}
>  
>  	if (oicr & PFINT_OICR_TSYN_EVNT_M) {

...