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Date:   Mon, 7 Sep 2020 14:53:12 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     "Kevin(Yudong) Yang" <yyd@...gle.com>
Cc:     netdev@...r.kernel.org, Neal Cardwell <ncardwell@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH ethtool,v2] ethtool: add support show/set-time-stamping

On Thu, Sep 03, 2020 at 10:07:14AM -0400, Kevin(Yudong) Yang wrote:
> Before this patch, ethtool has -T/--show-time-stamping that only
> shows the device's time stamping capabilities but not the time
> stamping policy that is used by the device.
> 
> This patch adds support to set/get device time stamping policy at
> the driver level by calling ioctl(SIOCSHWTSTAMP).
> 
> Tested: ran following cmds on a Mellanox NIC with mlx4_en driver:
> ./ethtool -T eth1
> ...
> Hardware Transmit Timestamp Modes:
>         off                   (HWTSTAMP_TX_OFF)
>         on                    (HWTSTAMP_TX_ON)
> Hardware Receive Filter Modes:
>         none                  (HWTSTAMP_FILTER_NONE)
>         all                   (HWTSTAMP_FILTER_ALL)
> Hardware Timestamping Policy:
>         Rx filter 0, none                  (HWTSTAMP_FILTER_NONE)
>         Tx type 0, off                   (HWTSTAMP_TX_OFF)
> 
> ./ethtool --set-time-stamping eth1 rx 1; ./ethtool -T eth1;
> ...
> Hardware Timestamping Policy:
> 	Rx filter 1, all                   (HWTSTAMP_FILTER_ALL)
> 	Tx type 0, off                   (HWTSTAMP_TX_OFF)
> 
> ./ethtool --set-time-stamping eth1 rx 1 tx 1; ./ethtool -T eth1;
> rx unmodified, ignoring
> ...
> Hardware Timestamping Policy:
> 	Rx filter 1, all                   (HWTSTAMP_FILTER_ALL)
> 	Tx type 1, on                    (HWTSTAMP_TX_ON)
> 
> ./ethtool --set-time-stamping eth1 rx 0; ./ethtool -T eth1;
> ...
> Hardware Timestamping Policy:
> 	Rx filter 0, none                  (HWTSTAMP_FILTER_NONE)
> 	Tx type 1, on                    (HWTSTAMP_TX_ON)
> 
> ./ethtool --set-time-stamping eth1 tx 0; ./ethtool -T eth1
> ...
> Hardware Timestamping Policy:
> 	Rx filter 0, none                  (HWTSTAMP_FILTER_NONE)
> 	Tx type 0, off                   (HWTSTAMP_TX_OFF)
> 
> ./ethtool --set-time-stamping eth1 rx 123 tx 456
> rx should be in [0..15], tx should be in [0..2]
> 
> Signed-off-by: Kevin Yang <yyd@...gle.com>
> Reviewed-by: Neal Cardwell <ncardwell@...gle.com>
> Reviewed-by: Eric Dumazet <edumazet@...gle.com>
> ---

As I said in response to v1 patch, I don't like the idea of adding a new
ioctl interface to ethool when we are working on replacing and
deprecating the existing ones. Is there a strong reason why this feature
shouldn't be implemented using netlink?

Michal

>  ethtool.8.in | 10 +++++-
>  ethtool.c    | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 94 insertions(+), 2 deletions(-)
> 
> diff --git a/ethtool.8.in b/ethtool.8.in
> index a50a476..9930804 100644
> --- a/ethtool.8.in
> +++ b/ethtool.8.in
> @@ -315,6 +315,11 @@ ethtool \- query or control network driver and hardware settings
>  .B ethtool \-T|\-\-show\-time\-stamping
>  .I devname
>  .HP
> +.B ethtool \-\-set\-time\-stamping
> +.I devname
> +.BN rx
> +.BN tx
> +.HP
>  .B ethtool \-x|\-\-show\-rxfh\-indir|\-\-show\-rxfh
>  .I devname
>  .HP
> @@ -1023,9 +1028,12 @@ is indicated, then ethtool fetches the dump data and directs it to a
>  Sets the dump flag for the device.
>  .TP
>  .B \-T \-\-show\-time\-stamping
> -Show the device's time stamping capabilities and associated PTP
> +Show the device's time stamping capabilities and policy and associated PTP
>  hardware clock.
>  .TP
> +.B \-\-set\-time\-stamping
> +Set the device's time stamping policy at the driver level.
> +.TP
>  .B \-x \-\-show\-rxfh\-indir \-\-show\-rxfh
>  Retrieves the receive flow hash indirection table and/or RSS hash key.
>  .TP
> diff --git a/ethtool.c b/ethtool.c
> index 606af3e..039b9a9 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -1618,6 +1618,24 @@ static int dump_tsinfo(const struct ethtool_ts_info *info)
>  	return 0;
>  }
>  
> +static int dump_hwtstamp_config(const struct hwtstamp_config *cfg)
> +{
> +	fprintf(stdout, "Hardware Timestamping Policy:\n");
> +	fprintf(stdout, "\tRx filter %d", cfg->rx_filter);
> +	if (cfg->rx_filter < N_RX_FILTERS)
> +		fprintf(stdout, ", %s\n", rx_filter_labels[cfg->rx_filter]);
> +	else
> +		fprintf(stdout, "\n");
> +
> +	fprintf(stdout, "\tTx type %d", cfg->tx_type);
> +	if (cfg->tx_type < N_TX_TYPES)
> +		fprintf(stdout, ", %s\n", tx_type_labels[cfg->tx_type]);
> +	else
> +		fprintf(stdout, "\n");
> +
> +	return 0;
> +}
> +
>  static struct ethtool_gstrings *
>  get_stringset(struct cmd_context *ctx, enum ethtool_stringset set_id,
>  	      ptrdiff_t drvinfo_offset, int null_terminate)
> @@ -4705,6 +4723,7 @@ err:
>  static int do_tsinfo(struct cmd_context *ctx)
>  {
>  	struct ethtool_ts_info info;
> +	struct hwtstamp_config cfg = { 0 };
>  
>  	if (ctx->argc != 0)
>  		exit_bad_args();
> @@ -4716,6 +4735,64 @@ static int do_tsinfo(struct cmd_context *ctx)
>  		return -1;
>  	}
>  	dump_tsinfo(&info);
> +
> +	ctx->ifr.ifr_data = (void *)&cfg;
> +	if (ioctl(ctx->fd, SIOCGHWTSTAMP, &ctx->ifr)) {
> +		perror("Cannot get device time stamping policy");
> +		return -1;
> +	}
> +	dump_hwtstamp_config(&cfg);
> +
> +	return 0;
> +}
> +
> +static int do_shwtstamp(struct cmd_context *ctx)
> +{
> +	struct hwtstamp_config cfg = { .rx_filter = -1, .tx_type = -1 },
> +			       pre_cfg;
> +	int changed = 0;
> +	struct cmdline_info cmdline_config[] = {
> +		{
> +			.name		= "rx",
> +			.type		= CMDL_S32,
> +			.wanted_val	= &cfg.rx_filter,
> +			.ioctl_val	= &pre_cfg.rx_filter,
> +		},
> +		{
> +			.name		= "tx",
> +			.type		= CMDL_S32,
> +			.wanted_val	= &cfg.tx_type,
> +			.ioctl_val	= &pre_cfg.tx_type,
> +		},
> +	};
> +
> +	parse_generic_cmdline(ctx, &changed,
> +			      cmdline_config, ARRAY_SIZE(cmdline_config));
> +
> +	ctx->ifr.ifr_data = (void *)&pre_cfg;
> +	if (ioctl(ctx->fd, SIOCGHWTSTAMP, &ctx->ifr)) {
> +		perror("Cannot get device time stamping settings");
> +		return -1;
> +	}
> +
> +	changed = 0;
> +	do_generic_set(cmdline_config, ARRAY_SIZE(cmdline_config), &changed);
> +	if (!changed) {
> +		fprintf(stderr, "no time-stamping policy changed.\n");
> +		return 0;
> +	}
> +
> +	if (cfg.tx_type >= N_TX_TYPES || cfg.rx_filter >= N_RX_FILTERS) {
> +		fprintf(stderr,
> +			"rx should be in [0..%d], tx should be in [0..%d]\n",
> +			N_RX_FILTERS - 1, N_TX_TYPES - 1);
> +		return -1;
> +	}
> +
> +	if (ioctl(ctx->fd, SIOCSHWTSTAMP, &ctx->ifr)) {
> +		perror("Cannot set device time stamping settings");
> +		return -1;
> +	}
>  	return 0;
>  }
>  
> @@ -5733,7 +5810,14 @@ static const struct option args[] = {
>  		.opts	= "-T|--show-time-stamping",
>  		.func	= do_tsinfo,
>  		.nlfunc	= nl_tsinfo,
> -		.help	= "Show time stamping capabilities"
> +		.help	= "Show time stamping capabilities and policy"
> +	},
> +	{
> +		.opts	= "--set-time-stamping",
> +		.func	= do_shwtstamp,
> +		.help	= "Set time stamping policy at the driver level",
> +		.xhelp	= "		[ rx N ]\n"
> +			  "		[ tx N ]\n"
>  	},
>  	{
>  		.opts	= "-x|--show-rxfh-indir|--show-rxfh",
> -- 
> 2.28.0.402.g5ffc5be6b7-goog
> 

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