linux-kernel - Re: [PATCH v1] IB/ipoib: Add readout of statistics using ethtool

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Date:	Wed, 20 Apr 2016 00:58:42 -0700
From:	Joe Perches <joe@...ches.com>
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 v1] IB/ipoib: Add readout of statistics using ethtool

On Wed, 2016-04-20 at 09:50 +0200, Hans Westgaard Ry 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.

trivial notes:

> diff --git 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) }
> +
> +
> +

A few unnecessary extra blank lines

> +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)
> +};

Couldn't the macro could be simplified by using # and
a single argument?


> +static int ipoib_get_sset_count(struct net_device __always_unused *dev,
> +				 int sset)
> +{
> +	switch (sset) {
> +	case ETH_SS_STATS:
> +		return IPOIB_GLOBAL_STATS_LEN;
> +	case ETH_SS_TEST:
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}

Didn't some old versions of gcc complain about reaching
the end of a non-void function?