netdev - Re: [PATCH net-next-2.6] myricom: remove stats

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Date:	Mon, 20 Jun 2011 13:00:45 -0500
From:	Jon Mason <jon.mason@...i.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Andrew Gallatin <gallatin@...i.com>,
	Brice Goglin <brice@...i.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH net-next-2.6] myricom: remove stats_lock

On Mon, Jun 20, 2011 at 1:07 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> stats_lock is non useless, lets remove it.
>
> Also, ndo_get_stats64() doesnt have to clear the stats, caller takes
> care of this.
>
> Note: folding 32bit fields in 64bit one is problematic when one of 32bit
> values wraps : SNMP reader will see a ~2^32 back change in a 64bit
> value. A future patch should fix this.

Good point, I'll push a patch shortly to increase the size of the
slice stats to 64b.

>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: Stephen Hemminger <shemminger@...tta.com>
> CC: Andrew Gallatin <gallatin@...i.com>
> CC: Brice Goglin <brice@...i.com>

Acked-by: Jon Mason <mason@...i.com>

> ---
>  drivers/net/myri10ge/myri10ge.c |   10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
> index 04e10f4..3e89a84 100644
> --- a/drivers/net/myri10ge/myri10ge.c
> +++ b/drivers/net/myri10ge/myri10ge.c
> @@ -210,7 +210,6 @@ struct myri10ge_priv {
>        int big_bytes;
>        int max_intr_slots;
>        struct net_device *dev;
> -       spinlock_t stats_lock;
>        u8 __iomem *sram;
>        int sram_size;
>        unsigned long board_span;
> @@ -1837,6 +1836,7 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
>        int i;
>
>        /* force stats update */
> +       memset(&link_stats, 0, sizeof(link_stats));
>        (void)myri10ge_get_stats(netdev, &link_stats);
>        for (i = 0; i < MYRI10GE_NET_STATS_LEN; i++)
>                data[i] = ((u64 *)&link_stats)[i];
> @@ -2981,12 +2981,10 @@ drop:
>  static struct rtnl_link_stats64 *myri10ge_get_stats(struct net_device *dev,
>                                                    struct rtnl_link_stats64 *stats)
>  {
> -       struct myri10ge_priv *mgp = netdev_priv(dev);
> -       struct myri10ge_slice_netstats *slice_stats;
> +       const struct myri10ge_priv *mgp = netdev_priv(dev);
> +       const struct myri10ge_slice_netstats *slice_stats;
>        int i;
>
> -       spin_lock(&mgp->stats_lock);
> -       memset(stats, 0, sizeof(*stats));
>        for (i = 0; i < mgp->num_slices; i++) {
>                slice_stats = &mgp->ss[i].stats;
>                stats->rx_packets += slice_stats->rx_packets;
> @@ -2996,7 +2994,6 @@ static struct rtnl_link_stats64 *myri10ge_get_stats(struct net_device *dev,
>                stats->rx_dropped += slice_stats->rx_dropped;
>                stats->tx_dropped += slice_stats->tx_dropped;
>        }
> -       spin_unlock(&mgp->stats_lock);
>        return stats;
>  }
>
> @@ -3966,7 +3963,6 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>        setup_timer(&mgp->watchdog_timer, myri10ge_watchdog_timer,
>                    (unsigned long)mgp);
>
> -       spin_lock_init(&mgp->stats_lock);
>        SET_ETHTOOL_OPS(netdev, &myri10ge_ethtool_ops);
>        INIT_WORK(&mgp->watchdog_work, myri10ge_watchdog);
>        status = register_netdev(netdev);
>
>
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