netdev - Re: [PATCH 2/2] ethtool: Add PHY statistics support

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Message-ID: <1457884216.3331.16.camel@decadent.org.uk>
Date:	Sun, 13 Mar 2016 15:50:16 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] ethtool: Add PHY statistics support

On Wed, 2015-12-23 at 12:58 +0100, Andrew Lunn wrote:
> This adds support for printing statistics from the network devices PHY.

Sorry it's taken me so long to respond to this.  There are a few issues
with it but I'll apply it anyway then fix them up.

> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  ethtool.8.in |  6 ++++++
>  ethtool.c    | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/ethtool.8.in b/ethtool.8.in
> index eeffa70..2316556 100644
> --- a/ethtool.8.in
> +++ b/ethtool.8.in
> @@ -220,6 +220,9 @@ ethtool \- query or control network driver and hardware settings
>  .B ethtool \-S|\-\-statistics
>  .I devname
>  .HP
> +.B ethtool \-I|\-\-phy-statistics
> +.I devname
> +.HP

-I isn't a useful mnemonic, so I will drop the short option altogether.

>  .B ethtool \-t|\-\-test
>  .I devname
>  .RI [\*(SD]
> @@ -492,6 +495,9 @@ auto-negotiation is enabled.
>  Queries the specified network device for NIC- and driver-specific
>  statistics.
>  .TP
> +.B \-I \-\-phy\-statistics
> +Queries the specified network device for PHY specific statistics.
> +.TP
>  .B \-t \-\-test
>  Executes adapter selftest on the specified network device. Possible test modes are:
>  .TP
> diff --git a/ethtool.c b/ethtool.c
> index 92c40b8..480c14c 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -2995,6 +2995,64 @@ static int do_gstats(struct cmd_context *ctx)
>  	return 0;
>  }
>  
> +static int do_gphystats(struct cmd_context *ctx)
> +{
> +	struct ethtool_gstrings *strings;
> +	struct ethtool_stats *stats;
> +	unsigned int n_stats, sz_stats, i;
> +	int err;
> +
> +	if (ctx->argc != 0)
> +		exit_bad_args();
> +
> +	strings = get_stringset(ctx, ETH_SS_PHY_STATS,
> +				offsetof(struct ethtool_drvinfo, n_stats),
> +				0);
> +	if (!strings) {
> +		perror("Cannot get stats strings information");
> +		return 96;
> +	}
> +

> +	n_stats = strings->len;
> +	if (n_stats < 1) {
> +		fprintf(stderr, "no stats available\n");
> +		free(strings);
> +		return 94;
> +	}
> +
> +	sz_stats = n_stats * sizeof(u64);
> +
> +	stats = calloc(1, sz_stats + sizeof(struct ethtool_stats));
> +	if (!stats) {
> +		fprintf(stderr, "no memory available\n");
> +		free(strings);
> +		return 95;
> +	}
> +
> +	stats->cmd = ETHTOOL_GPHYSTATS;
> +	stats->n_stats = n_stats;
> +	err = send_ioctl(ctx, stats);
> +	if (err < 0) {
> +		perror("Cannot get stats information");
> +		free(strings);
> +		free(stats);
> +		return 97;
> +	}
> +
> +	/* todo - pretty-print the strings per-driver */
> +	fprintf(stdout, "PHY statistics:\n");
> +	for (i = 0; i < n_stats; i++) {
> +		fprintf(stdout, "     %.*s: %llu\n",
> +			ETH_GSTRING_LEN,
> +			&strings->data[i * ETH_GSTRING_LEN],
> +			stats->data[i]);
> +	}
> +	free(strings);
> +	free(stats);
> +
> +	return 0;
> +}

This is basically a copy-paste of do_gstats() so they should be merged
into one function.

Ben.

>  static int do_srxntuple(struct cmd_context *ctx,
>  			struct ethtool_rx_flow_spec *rx_rule_fs);
>  
> @@ -4078,6 +4136,8 @@ static const struct option {
>  	{ "-t|--test", 1, do_test, "Execute adapter self test",
>  	  "               [ online | offline | external_lb ]\n" },
>  	{ "-S|--statistics", 1, do_gstats, "Show adapter statistics" },
> +	{ "-I|--phy-statistics", 1, do_gphystats,
> +	  "Show phy statistics" },
>  	{ "-n|-u|--show-nfc|--show-ntuple", 1, do_grxclass,
>  	  "Show Rx network flow classification options or rules",
>  	  "		[ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|"
-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.
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