netdev - Re: [PATCH net-next v2 1/8] ethtool: add standard pause stats

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Date:   Mon, 14 Sep 2020 08:48:10 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, mkubecek@...e.cz,
        michael.chan@...adcom.com, tariqt@...dia.com, saeedm@...dia.com,
        alexander.duyck@...il.com
Subject: Re: [PATCH net-next v2 1/8] ethtool: add standard pause stats

On Mon, 14 Sep 2020 03:48:40 +0200 Andrew Lunn wrote:
> >  static int pause_prepare_data(const struct ethnl_req_info *req_base,
> > @@ -34,10 +36,17 @@ static int pause_prepare_data(const struct ethnl_req_info *req_base,
> >  
> >  	if (!dev->ethtool_ops->get_pauseparam)
> >  		return -EOPNOTSUPP;
> > +
> >  	ret = ethnl_ops_begin(dev);
> >  	if (ret < 0)
> >  		return ret;
> >  	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
> > +	if (req_base->flags & ETHTOOL_FLAG_STATS &&
> > +	    dev->ethtool_ops->get_pause_stats) {
> > +		memset(&data->pausestat, 0xff,
> > +		       sizeof(struct ethtool_pause_stats));  
> 
> Sorry, i missed v1 of these patches. Maybe this has been commented?
> 
> Filling with 0xff is odd. I don't know of any other code doing this.

Are you saying it'd be clearer to assign ETHTOOL_STAT_NOT_SET in a loop?

Or do you think the mechanism of using ~0 as "not reported" is not good?