netdev - Re: [Intel-wired-lan] [PATCH iwl-next 3/6] ice: Simplify bitmap setting in adding recipe

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Date: Wed, 19 Jun 2024 16:34:15 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Marcin Szycik <marcin.szycik@...ux.intel.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<przemyslaw.kitszel@...el.com>, <michal.swiatkowski@...ux.intel.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next 3/6] ice: Simplify bitmap
 setting in adding recipe

From: Marcin Szycik <marcin.szycik@...ux.intel.com>
Date: Tue, 18 Jun 2024 16:11:54 +0200

> From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> 
> Remove unnecessary size checks when copying bitmaps in ice_add_sw_recipe()
> and replace them with compile time assert. Check if the bitmaps are equal
> size, as they are copied both ways.
> 
> Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Co-developed-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
> Signed-off-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_switch.c | 24 ++++++++-------------
>  1 file changed, 9 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
> index da065512889d..2f67fbb73fd1 100644
> --- a/drivers/net/ethernet/intel/ice/ice_switch.c
> +++ b/drivers/net/ethernet/intel/ice/ice_switch.c
> @@ -5067,6 +5067,10 @@ ice_find_free_recp_res_idx(struct ice_hw *hw, const unsigned long *profiles,
>  	return (u16)bitmap_weight(free_idx, ICE_MAX_FV_WORDS);
>  }
>  
> +/* For memcpy in ice_add_sw_recipe. */
> +static_assert(sizeof(((struct ice_aqc_recipe_data_elem *)0)->recipe_bitmap) ==
> +	      sizeof(((struct ice_sw_recipe *)0)->r_bitmap));

sizeof_field(struct ice_aqc_recipe_data_elem, recipe_bitmap) etc.

> +
>  /**
>   * ice_add_sw_recipe - function to call AQ calls to create switch recipe
>   * @hw: pointer to hardware structure
> @@ -5187,13 +5191,9 @@ ice_add_sw_recipe(struct ice_hw *hw, struct ice_sw_recipe *rm,
>  		rm->root_rid = buf[0].recipe_indx;
>  		set_bit(buf[0].recipe_indx, rm->r_bitmap);
>  		buf[0].content.rid = rm->root_rid | ICE_AQ_RECIPE_ID_IS_ROOT;
> -		if (sizeof(buf[0].recipe_bitmap) >= sizeof(rm->r_bitmap)) {
> -			memcpy(buf[0].recipe_bitmap, rm->r_bitmap,
> -			       sizeof(buf[0].recipe_bitmap));
> -		} else {
> -			status = -EINVAL;
> -			goto err_unroll;
> -		}
> +		memcpy(buf[0].recipe_bitmap, rm->r_bitmap,
> +		       sizeof(buf[0].recipe_bitmap));
> +
>  		/* Applicable only for ROOT_RECIPE, set the fwd_priority for
>  		 * the recipe which is getting created if specified
>  		 * by user. Usually any advanced switch filter, which results
> @@ -5256,14 +5256,8 @@ ice_add_sw_recipe(struct ice_hw *hw, struct ice_sw_recipe *rm,
>  			set_bit(entry->rid, rm->r_bitmap);
>  		}
>  		list_add(&last_chain_entry->l_entry, &rm->rg_list);
> -		if (sizeof(buf[recps].recipe_bitmap) >=
> -		    sizeof(rm->r_bitmap)) {
> -			memcpy(buf[recps].recipe_bitmap, rm->r_bitmap,
> -			       sizeof(buf[recps].recipe_bitmap));
> -		} else {
> -			status = -EINVAL;
> -			goto err_unroll;
> -		}
> +		memcpy(buf[recps].recipe_bitmap, rm->r_bitmap,
> +		       sizeof(buf[recps].recipe_bitmap));
>  		content->act_ctrl_fwd_priority = rm->priority;
>  
>  		recps++;

Thanks,
Olek