netdev - Re: [PATCH v4 net-next 1/7] net: mvneta: introduce mvneta_update

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Date:   Wed, 16 Oct 2019 18:01:37 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        davem@...emloft.net, thomas.petazzoni@...tlin.com,
        brouer@...hat.com, ilias.apalodimas@...aro.org,
        matteo.croce@...hat.com, mw@...ihalf.com
Subject: Re: [PATCH v4 net-next 1/7] net: mvneta: introduce
 mvneta_update_stats routine

On Wed, 16 Oct 2019 23:03:06 +0200, Lorenzo Bianconi wrote:
> Introduce mvneta_update_stats routine to collect {rx/tx} statistics
> (packets and bytes). This is a preliminary patch to add XDP support to
> mvneta driver
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/ethernet/marvell/mvneta.c | 41 +++++++++++++--------------
>  1 file changed, 20 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index e49820675c8c..128b9fded959 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -1900,6 +1900,23 @@ static void mvneta_rxq_drop_pkts(struct mvneta_port *pp,
>  	}
>  }
>  
> +static void
> +mvneta_update_stats(struct mvneta_port *pp, u32 pkts,
> +		    u32 len, bool tx)
> +{
> +	struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
> +
> +	u64_stats_update_begin(&stats->syncp);
> +	if (tx) {
> +		stats->tx_packets += pkts;
> +		stats->tx_bytes += len;
> +	} else {
> +		stats->rx_packets += pkts;
> +		stats->rx_bytes += len;
> +	}
> +	u64_stats_update_end(&stats->syncp);
> +}
> +
>  static inline
>  int mvneta_rx_refill_queue(struct mvneta_port *pp, struct mvneta_rx_queue *rxq)
>  {
> @@ -2075,14 +2092,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
>  		rxq->left_size = 0;
>  	}
>  
> -	if (rcvd_pkts) {

nit: you're getting rid of this check in the new helper, perhaps worth
     mentioning in the commit message why its irrelevant

> -		struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
> -
> -		u64_stats_update_begin(&stats->syncp);
> -		stats->rx_packets += rcvd_pkts;
> -		stats->rx_bytes   += rcvd_bytes;
> -		u64_stats_update_end(&stats->syncp);
> -	}
> +	mvneta_update_stats(pp, rcvd_pkts, rcvd_bytes, false);
>  
>  	/* return some buffers to hardware queue, one at a time is too slow */
>  	refill = mvneta_rx_refill_queue(pp, rxq);