netdev - Re: [net-next v3] idpf: Don't hard code napi

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Message-ID: <a2e5f614-5540-46a5-8438-23d6eea663fe@intel.com>
Date: Fri, 4 Oct 2024 16:22:56 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Joe Damato <jdamato@...tly.com>
CC: <netdev@...r.kernel.org>, <przemyslaw.kitszel@...el.com>,
	<horms@...nel.org>, <kuba@...nel.org>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, "David S. Miller" <davem@...emloft.net>, "Eric
 Dumazet" <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, "moderated
 list:INTEL ETHERNET DRIVERS" <intel-wired-lan@...ts.osuosl.org>, open list
	<linux-kernel@...r.kernel.org>
Subject: Re: [net-next v3] idpf: Don't hard code napi_struct size

From: Joe Damato <jdamato@...tly.com>
Date: Fri,  4 Oct 2024 10:54:07 +0000

> The sizeof(struct napi_struct) can change. Don't hardcode the size to
> 400 bytes and instead use "sizeof(struct napi_struct)".
> 
> Suggested-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> Signed-off-by: Joe Damato <jdamato@...tly.com>

Acked-by: Alexander Lobakin <aleksander.lobakin@...el.com>

I'm sorry that I complicated things a bit with those assertions =\

> ---
>  drivers/net/ethernet/intel/idpf/idpf_txrx.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
> index f0537826f840..9c1fe84108ed 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
> +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
> @@ -438,7 +438,8 @@ struct idpf_q_vector {
>  	__cacheline_group_end_aligned(cold);
>  };
>  libeth_cacheline_set_assert(struct idpf_q_vector, 112,
> -			    424 + 2 * sizeof(struct dim),
> +			    24 + sizeof(struct napi_struct) +
> +			    2 * sizeof(struct dim),
>  			    8 + sizeof(cpumask_var_t));
>  
>  struct idpf_rx_queue_stats {

Thanks,
Olek