netdev - Re: [PATCH ethtool-next v3] netlink: tsconfig: add HW time stamping configuration

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Message-ID: <3df1dd80-4268-4505-bc79-87392a8bbb34@linux.dev>
Date: Wed, 12 Nov 2025 17:24:29 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Michal Kubecek <mkubecek@...e.cz>, Jakub Kicinski <kuba@...nel.org>,
 netdev@...r.kernel.org
Subject: Re: [PATCH ethtool-next v3] netlink: tsconfig: add HW time stamping
 configuration

On 12/11/2025 08:48, Kory Maincent wrote:
> On Fri,  7 Nov 2025 18:20:44 +0000
> Vadim Fedorenko <vadim.fedorenko@...ux.dev> wrote:
> 
>> The kernel supports configuring HW time stamping modes via netlink
>> messages, but previous implementation added support for HW time stamping
>> source configuration. Add support to configure TX/RX time stamping.
>> We keep TX type and RX filter configuration as a bit value, but if we
>> will need multibit value to be set in the future, there is an option to
>> use "rx-filters" keyword which will be mutually exclusive with current
>> "rx-filter" keyword. The same applies to "tx-type".
>>
>> Signed-off-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
>> Reviewed-by: Kory Maincent <kory.maincent@...tlin.com>
>> ---
>> v2 -> v3:
>> * improve code style
>> v1 -> v2:
>> * improve commit message
>> ---
>>   ethtool.8.in       | 12 +++++++-
>>   ethtool.c          |  1 +
>>   netlink/tsconfig.c | 77 +++++++++++++++++++++++++++++++++++++++++++++-
>>   3 files changed, 88 insertions(+), 2 deletions(-)
>>
>> diff --git a/ethtool.8.in b/ethtool.8.in
>> index 8874ade..1788588 100644
>> --- a/ethtool.8.in
>> +++ b/ethtool.8.in
>> @@ -357,6 +357,10 @@ ethtool \- query or control network driver and hardware
>> settings .IR N
>>   .BI qualifier
>>   .IR precise|approx ]
>> +.RB [ tx
>> +.IR TX-TYPE ]
>> +.RB [ rx-filter
>> +.IR RX-FILTER ]
>>   .HP
>>   .B ethtool \-x|\-\-show\-rxfh\-indir|\-\-show\-rxfh
>>   .I devname
>> @@ -1287,7 +1291,7 @@ for IEEE 1588 quality and "approx" is for NICs DMA
>> point. Show the selected time stamping PTP hardware clock configuration.
>>   .TP
>>   .B \-\-set\-hwtimestamp\-cfg
>> -Select the device's time stamping PTP hardware clock.
>> +Sets the device's time stamping PTP hardware clock configuration.
>>   .RS 4
>>   .TP
>>   .BI index \ N
>> @@ -1296,6 +1300,12 @@ Index of the ptp hardware clock
>>   .BI qualifier \ precise | approx
>>   Qualifier of the ptp hardware clock. Mainly "precise" the default one is
>>   for IEEE 1588 quality and "approx" is for NICs DMA point.
>> +.TP
>> +.BI tx \ TX-TYPE
>> +Type of TX time stamping to configure
>> +.TP
>> +.BI rx-filter \ RX-FILTER
>> +Type of RX time stamping filter to configure
>>   .RE
>>   .TP
>>   .B \-x \-\-show\-rxfh\-indir \-\-show\-rxfh
>> diff --git a/ethtool.c b/ethtool.c
>> index bd45b9e..521e6fe 100644
>> --- a/ethtool.c
>> +++ b/ethtool.c
>> @@ -6068,6 +6068,7 @@ static const struct option args[] = {
>>   		.nlfunc	= nl_stsconfig,
>>   		.help	= "Select hardware time stamping",
>>   		.xhelp	= "		[ index N qualifier
>> precise|approx ]\n"
>> +			  "		[ tx TX-TYPE ] [ rx-filter
>> RX-FILTER ]\n" },
>>   	{
>>   		.opts	= "-x|--show-rxfh-indir|--show-rxfh",
>> diff --git a/netlink/tsconfig.c b/netlink/tsconfig.c
>> index d427c7b..f4ed10e 100644
>> --- a/netlink/tsconfig.c
>> +++ b/netlink/tsconfig.c
>> @@ -17,6 +17,7 @@
>>   #include "netlink.h"
>>   #include "bitset.h"
>>   #include "parser.h"
>> +#include "strset.h"
>>   #include "ts.h"
>>   
>>   /* TSCONFIG_GET */
>> @@ -94,6 +95,66 @@ int nl_gtsconfig(struct cmd_context *ctx)
>>   
>>   /* TSCONFIG_SET */
>>   
>> +int tsconfig_txrx_parser(struct nl_context *nlctx, uint16_t type,
>> +			 const void *data __maybe_unused,
>> +			 struct nl_msg_buff *msgbuff,
>> +			 void *dest __maybe_unused)
>> +{
>> +	struct nlattr *bits_attr, *bit_attr;
>> +	const struct stringset *values;
>> +	const char *arg = *nlctx->argp;
>> +	unsigned int count, i;
>> +
>> +	nlctx->argp++;
>> +	nlctx->argc--;
>> +	if (netlink_init_ethnl2_socket(nlctx) < 0)
>> +		return -EIO;
>> +
>> +	switch (type) {
>> +	case ETHTOOL_A_TSCONFIG_TX_TYPES:
>> +		values = global_stringset(ETH_SS_TS_TX_TYPES,
>> nlctx->ethnl2_socket);
>> +		break;
>> +	case ETHTOOL_A_TSCONFIG_RX_FILTERS:
>> +		values = global_stringset(ETH_SS_TS_RX_FILTERS,
>> nlctx->ethnl2_socket);
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	count = get_count(values);
>> +	for (i = 0; i < count; i++) {
>> +		const char *name = get_string(values, i);
>> +
>> +		if (!strcmp(name, arg))
>> +			break;
>> +	}
>> +
>> +	if (i != count)
>> +		return -EINVAL;
> 
> It seems you update your patch too quickly and don't test it.
> It should be "if (i == count)" here.

You are right, thanks for catching it.
v4 is on the way.