netdev - Re: [PATCH net-next v3 2/3] bnxt: count packets discarded because of netpoll

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Date:   Thu, 26 Aug 2021 12:18:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, olteanv@...il.com
Subject: Re: [PATCH net-next v3 2/3] bnxt: count packets discarded because
 of netpoll

On Thu, 26 Aug 2021 11:43:58 -0700 Michael Chan wrote:
> On Thu, Aug 26, 2021 at 6:12 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > @@ -10646,11 +10653,15 @@ static void bnxt_get_ring_stats(struct bnxt *bp,
> >                 stats->multicast += BNXT_GET_RING_STATS64(sw, rx_mcast_pkts);
> >
> >                 stats->tx_dropped += BNXT_GET_RING_STATS64(sw, tx_error_pkts);
> > +
> > +               bsw_stats->rx.rx_netpoll_discards +=
> > +                       cpr->sw_stats.rx.rx_netpoll_discards;  
> 
> Can we just add these rx_netpoll_discards counters directly to
> stats->rx_dropped?  It looks simpler if we do it that way, right?

To make sure - are you saying that instead of adding

	struct bnxt_sw_stats	sw_stats_prev;

we should accumulate in net_stats_prev->rx_dropped, and have 
the ethtool counter only report the discards since last down/up?

Or to use the atomic counter on the netdev and never report 
in ethtool (since after patch 3 rx_dropped is a mix of reasons)?