netdev - Re: [net-next 4/4] gve: Add ethtool support

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Date:   Fri, 28 Jun 2019 10:42:22 -0700
From:   Catherine Sullivan <csully@...gle.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Sagi Shahar <sagis@...gle.com>,
        Jon Olson <jonolson@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Luigi Rizzo <lrizzo@...gle.com>
Subject: Re: [net-next 4/4] gve: Add ethtool support

On Wed, Jun 26, 2019 at 12:48 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > +static int gve_get_sset_count(struct net_device *netdev, int sset)
> > +{
> > +     struct gve_priv *priv = netdev_priv(netdev);
> > +
> > +     if (!netif_carrier_ok(netdev))
> > +             return 0;
>
> That is pretty unusual. What goes wrong if there is no carrier and
> statistics are returned?

This was meant to protect against priv->rx/tx not being a valid pointer.
In v2 it will just check the pointer instead of the carrier status.

>
> > +static void
> > +gve_get_ethtool_stats(struct net_device *netdev,
> > +                   struct ethtool_stats *stats, u64 *data)
> > +{
> > +     struct gve_priv *priv = netdev_priv(netdev);
> > +     u64 rx_pkts, rx_bytes, tx_pkts, tx_bytes;
> > +     int ring;
> > +     int i;
> > +
> > +     ASSERT_RTNL();
> > +
> > +     if (!netif_carrier_ok(netdev))
> > +             return;
> > +
> > +     for (rx_pkts = 0, rx_bytes = 0, ring = 0;
> > +          ring < priv->rx_cfg.num_queues; ring++) {
> > +             rx_pkts += priv->rx[ring].rpackets;
> > +             rx_bytes += priv->rx[ring].rbytes;
> > +     }
> > +     for (tx_pkts = 0, tx_bytes = 0, ring = 0;
> > +          ring < priv->tx_cfg.num_queues; ring++) {
> > +             tx_pkts += priv->tx[ring].pkt_done;
> > +             tx_bytes += priv->tx[ring].bytes_done;
> > +     }
> > +     memset(data, 0, GVE_MAIN_STATS_LEN * sizeof(*data));
>
> Maybe you should do this memset when the carrier is off?

Will be fixed in v2.

>
>       Andrew


Catherine