Subject: Re: [PATCH net-next 3/3] iavf: remove mask from iavf_irq_enable_queues()

From: Maciej Fijalkowski <[email-masked]>
Date: Mon, 5 Jun 2023 21:25:26 +0200

On Fri, Jun 02, 2023 at 10:13:02AM -0700, Tony Nguyen wrote:
> From: Ahmed Zaki <[email-masked]>
> 
> Enable more than 32 IRQs by removing the u32 bit mask in
> iavf_irq_enable_queues(). There is no need for the mask as there are no
> callers that select individual IRQs through the bitmask. Also, if the PF
> allocates more than 32 IRQs, this mask will prevent us from using all of
> them.
> 
> The comment in iavf_register.h is modified to show that the maximum
> number allowed for the IRQ index is 63 as per the iAVF standard 1.0 [1].

please use imperative mood:
"modify the comment in..."

besides, it sounds to me like a bug, we were not following the spec, no?

> 
> link: [1] https://www.intel.com/content/dam/www/public/us/en/documents/product-specifications/ethernet-adaptive-virtual-function-hardware-spec.pdf
> Signed-off-by: Ahmed Zaki <[email-masked]>
> Tested-by: Rafal Romanowski <[email-masked]>
> Signed-off-by: Tony Nguyen <[email-masked]>

Reviewed-by: Maciej Fijalkowski <[email-masked]>

> ---
>  drivers/net/ethernet/intel/iavf/iavf.h          |  2 +-
>  drivers/net/ethernet/intel/iavf/iavf_main.c     | 15 ++++++---------
>  drivers/net/ethernet/intel/iavf/iavf_register.h |  2 +-
>  3 files changed, 8 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
> index 9abaff1f2aff..39d0fe76a38f 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf.h
> @@ -525,7 +525,7 @@ void iavf_set_ethtool_ops(struct net_device *netdev);
>  void iavf_update_stats(struct iavf_adapter *adapter);
>  void iavf_reset_interrupt_capability(struct iavf_adapter *adapter);
>  int iavf_init_interrupt_scheme(struct iavf_adapter *adapter);
> -void iavf_irq_enable_queues(struct iavf_adapter *adapter, u32 mask);
> +void iavf_irq_enable_queues(struct iavf_adapter *adapter);
>  void iavf_free_all_tx_resources(struct iavf_adapter *adapter);
>  void iavf_free_all_rx_resources(struct iavf_adapter *adapter);
>  
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
> index 3a78f86ba4f9..1332633f0ca5 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
> @@ -359,21 +359,18 @@ static void iavf_irq_disable(struct iavf_adapter *adapter)
>  }
>  
>  /**
> - * iavf_irq_enable_queues - Enable interrupt for specified queues
> + * iavf_irq_enable_queues - Enable interrupt for all queues
>   * @adapter: board private structure
> - * @mask: bitmap of queues to enable
>   **/
> -void iavf_irq_enable_queues(struct iavf_adapter *adapter, u32 mask)
> +void iavf_irq_enable_queues(struct iavf_adapter *adapter)
>  {
>  	struct iavf_hw *hw = &adapter->hw;
>  	int i;
>  
>  	for (i = 1; i < adapter->num_msix_vectors; i++) {
> -		if (mask & BIT(i - 1)) {
> -			wr32(hw, IAVF_VFINT_DYN_CTLN1(i - 1),
> -			     IAVF_VFINT_DYN_CTLN1_INTENA_MASK |
> -			     IAVF_VFINT_DYN_CTLN1_ITR_INDX_MASK);
> -		}
> +		wr32(hw, IAVF_VFINT_DYN_CTLN1(i - 1),
> +		     IAVF_VFINT_DYN_CTLN1_INTENA_MASK |
> +		     IAVF_VFINT_DYN_CTLN1_ITR_INDX_MASK);
>  	}
>  }
>  
> @@ -387,7 +384,7 @@ void iavf_irq_enable(struct iavf_adapter *adapter, bool flush)
>  	struct iavf_hw *hw = &adapter->hw;
>  
>  	iavf_misc_irq_enable(adapter);
> -	iavf_irq_enable_queues(adapter, ~0);
> +	iavf_irq_enable_queues(adapter);
>  
>  	if (flush)
>  		iavf_flush(hw);
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_register.h b/drivers/net/ethernet/intel/iavf/iavf_register.h
> index bf793332fc9d..a19e88898a0b 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_register.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf_register.h
> @@ -40,7 +40,7 @@
>  #define IAVF_VFINT_DYN_CTL01_INTENA_MASK IAVF_MASK(0x1, IAVF_VFINT_DYN_CTL01_INTENA_SHIFT)
>  #define IAVF_VFINT_DYN_CTL01_ITR_INDX_SHIFT 3
>  #define IAVF_VFINT_DYN_CTL01_ITR_INDX_MASK IAVF_MASK(0x3, IAVF_VFINT_DYN_CTL01_ITR_INDX_SHIFT)
> -#define IAVF_VFINT_DYN_CTLN1(_INTVF) (0x00003800 + ((_INTVF) * 4)) /* _i=0...15 */ /* Reset: VFR */

so this was wrong even before as not indicating 31 as max?

> +#define IAVF_VFINT_DYN_CTLN1(_INTVF) (0x00003800 + ((_INTVF) * 4)) /* _i=0...63 */ /* Reset: VFR */
>  #define IAVF_VFINT_DYN_CTLN1_INTENA_SHIFT 0
>  #define IAVF_VFINT_DYN_CTLN1_INTENA_MASK IAVF_MASK(0x1, IAVF_VFINT_DYN_CTLN1_INTENA_SHIFT)
>  #define IAVF_VFINT_DYN_CTLN1_SWINT_TRIG_SHIFT 2
> -- 
> 2.38.1
> 
>