netdev - Re: [PATCH net v2 7/9] net: aquantia: Reset driver level statistics to zero on initialization

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Date:   Mon, 11 Dec 2017 16:51:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Igor Russkikh <igor.russkikh@...antia.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        David Arcari <darcari@...hat.com>,
        Pavel Belous <pavel.belous@...antia.com>,
        Nadezhda Krupnina <Nadezhda.Krupnina@...antia.com>,
        Simon Edelhaus <simon.edelhaus@...antia.com>
Subject: Re: [PATCH net v2 7/9] net: aquantia: Reset driver level statistics
 to zero on initialization

> --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c
> @@ -344,6 +344,13 @@ static int hw_atl_a0_hw_init(struct aq_hw_s *self,
>  	hw_atl_a0_hw_rss_set(self, &aq_nic_cfg->aq_rss);
>  	hw_atl_a0_hw_rss_hash_set(self, &aq_nic_cfg->aq_rss);
>  
> +	/* Read initial hardware counters
> +	 * and reset current in-driver statistics
> +	 */
> +	hw_atl_utils_update_stats(self);
> +	memset(&PHAL_ATLANTIC_A0->curr_stats, 0,
> +	       sizeof(PHAL_ATLANTIC_A0->curr_stats));
> +
>  	err = aq_hw_err_from_flags(self);
>  	if (err < 0)
>  		goto err_exit;

Hi Igor

It looks like this is called on pm state change? Does this mean that
resume will zero the statistics? That is probably not what you want.

You should probably only clear the statics in the probe function.

       Andrew