linux-kernel - Re: [PATCH] IB/ipoib: Add readout of statistics using ethtool

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Date:	Tue, 19 Apr 2016 17:50:23 +0300
From:	Erez Shitrit <erezsh@....mellanox.co.il>
To:	Hans Westgaard Ry <hans.westgaard.ry@...cle.com>
Cc:	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Santosh Shilimkar <santosh.shilimkar@...cle.com>,
	Yuval Shaia <yuval.shaia@...cle.com>,
	"open list:INFINIBAND SUBSYSTEM" <linux-rdma@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] IB/ipoib: Add readout of statistics using ethtool

On Fri, Apr 15, 2016 at 1:17 PM, Hans Westgaard Ry
<hans.westgaard.ry@...cle.com> wrote:
> IPoIB collects statistics of traffic including number of packets
> sent/received, number of bytes transferred, and certain errors. This
> patch makes these statistics available to be queried by ethtool.
>
> Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@...cle.com>
> Reviewed-by: Yuval Shaia <yuval.shaia@...cle.com>
> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> Tested-by: Yuval Shaia <yuval.shaia@...cle.com>

Acked-by: Erez Shitrit <erezsh@...lanox.com>

> ---
>  drivers/infiniband/ulp/ipoib/ipoib_ethtool.c | 70 ++++++++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
>
> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
> index a53fa5f..52a1f30 100644
> --- a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
> +++ b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
> @@ -36,6 +36,31 @@
>
>  #include "ipoib.h"
>
> +struct ipoib_stats {
> +       char stat_string[ETH_GSTRING_LEN];
> +       int stat_offset;
> +};
> +
> +
> +#define IPOIB_NETDEV_STAT(str, m) { \
> +               .stat_string = str, \
> +               .stat_offset = offsetof(struct rtnl_link_stats64, m) }
> +
> +
> +
> +static const struct ipoib_stats ipoib_gstrings_stats[] = {
> +       IPOIB_NETDEV_STAT("rx_packets", rx_packets),
> +       IPOIB_NETDEV_STAT("tx_packets", tx_packets),
> +       IPOIB_NETDEV_STAT("rx_bytes",   rx_bytes),
> +       IPOIB_NETDEV_STAT("tx_bytes",   tx_bytes),
> +       IPOIB_NETDEV_STAT("tx_errors",  tx_errors),
> +       IPOIB_NETDEV_STAT("rx_dropped", rx_dropped),
> +       IPOIB_NETDEV_STAT("tx_dropped", tx_dropped)
> +};
> +
> +#define IPOIB_GLOBAL_STATS_LEN ARRAY_SIZE(ipoib_gstrings_stats)
> +
> +
>  static void ipoib_get_drvinfo(struct net_device *netdev,
>                               struct ethtool_drvinfo *drvinfo)
>  {
> @@ -92,11 +117,56 @@ static int ipoib_set_coalesce(struct net_device *dev,
>
>         return 0;
>  }
> +static void ipoib_get_ethtool_stats(struct net_device *dev,
> +                                   struct ethtool_stats __always_unused *stats,
> +                                   u64 *data)
> +{
> +       int i;
> +       struct net_device_stats *net_stats = &dev->stats;
> +       u8 *p = (u8 *)net_stats;
> +
> +       for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++)
> +               data[i] = *(u64 *)(p + ipoib_gstrings_stats[i].stat_offset);
> +
> +}
> +static void ipoib_get_strings(struct net_device __always_unused *dev,
> +                             u32 stringset, u8 *data)
> +{
> +       u8 *p = data;
> +       int i;
> +
> +       switch (stringset) {
> +       case ETH_SS_TEST:
> +               break;
> +       case ETH_SS_STATS:
> +               for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++) {
> +                       memcpy(p, ipoib_gstrings_stats[i].stat_string,
> +                               ETH_GSTRING_LEN);
> +                       p += ETH_GSTRING_LEN;
> +               }
> +               break;
> +       }
> +}
> +static int ipoib_get_sset_count(struct net_device __always_unused *dev,
> +                                int sset)
> +{
> +       switch (sset) {
> +       case ETH_SS_TEST:
> +               return -EOPNOTSUPP;
> +       case ETH_SS_STATS:
> +               return IPOIB_GLOBAL_STATS_LEN;
> +       default:
> +               return -EOPNOTSUPP;
> +       }
> +}
>
>  static const struct ethtool_ops ipoib_ethtool_ops = {
>         .get_drvinfo            = ipoib_get_drvinfo,
>         .get_coalesce           = ipoib_get_coalesce,
>         .set_coalesce           = ipoib_set_coalesce,
> +       .get_strings            = ipoib_get_strings,
> +       .get_ethtool_stats      = ipoib_get_ethtool_stats,
> +       .get_sset_count         = ipoib_get_sset_count,
>  };
>
>  void ipoib_set_ethtool_ops(struct net_device *dev)
> --
> 2.4.3
>
> --
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