netdev - Re: [PATCH net-next 4/5] net: mvneta: introduce xdp counters to ethtool

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Date:   Mon, 17 Feb 2020 11:25:50 +0100
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org,
        ilias.apalodimas@...aro.org, davem@...emloft.net,
        David Ahern <dsahern@...nel.org>,
        BPF-dev-list <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next 4/5] net: mvneta: introduce xdp counters to
 ethtool

> On Sun, 16 Feb 2020 22:07:32 +0100
> Lorenzo Bianconi <lorenzo@...nel.org> wrote:
> 
> > @@ -2033,6 +2050,7 @@ mvneta_xdp_submit_frame(struct mvneta_port *pp, struct mvneta_tx_queue *txq,
> >  	u64_stats_update_begin(&stats->syncp);
> >  	stats->es.ps.tx_bytes += xdpf->len;
> >  	stats->es.ps.tx_packets++;
> > +	stats->es.ps.xdp_tx++;
> >  	u64_stats_update_end(&stats->syncp);
> 
> I find it confusing that this ethtool stats is named "xdp_tx".
> Because you use it as an "xmit" counter and not for the action XDP_TX.
> 
> Both XDP_TX and XDP_REDIRECT out this device will increment this
> "xdp_tx" counter.  I don't think end-users will comprehend this...
> 
> What about naming it "xdp_xmit" ?

Hi Jesper,

yes, I think it is definitely better. So to follow up:
- rename current "xdp_tx" counter in "xdp_xmit" and increment it for
  XDP_TX verdict and for ndo_xdp_xmit
- introduce a new "xdp_tx" counter only for XDP_TX verdict.

If we agree I can post a follow-up patch.

Regards,
Lorenzo

> 
> 
> >  	mvneta_txq_inc_put(txq);
> > @@ -2114,6 +2132,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> >  
> >  	switch (act) {
> >  	case XDP_PASS:
> > +		stats->xdp_pass++;
> >  		return MVNETA_XDP_PASS;
> >  	case XDP_REDIRECT: {
> >  		int err;
> > @@ -2126,6 +2145,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> >  					     len, true);
> >  		} else {
> >  			ret = MVNETA_XDP_REDIR;
> > +			stats->xdp_redirect++;
> >  		}
> >  		break;
> >  	}
> > @@ -2147,6 +2167,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> >  				     virt_to_head_page(xdp->data),
> >  				     len, true);
> >  		ret = MVNETA_XDP_DROPPED;
> > +		stats->xdp_drop++;
> >  		break;
> >  	}
> 
> 
> -- 
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer
> 

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