Re: [PATCH v8 net-next 2/3] netdevsim: Implement basic ptp support

[Vadim Fedorenko <vadim.fedorenko@linux.dev>]

On 12.08.2026 19:37, Maciek Machnikowski wrote:
> Add support for virtual timestamping inside the netdevsim driver.
> The implementation uses two attached ptp_mock clocks, reads the timestamps
> of the ones attached either to the netdevsim or its peer and returns
> timestamps using standard timestamps APIs.
> 
> This implementation enables running ptp4l on netdevsim adapters and
> introduces a new ptp selftest.
> 
> Co-developed-by: Milena Olech <milena.olech@intel.com>
> Signed-off-by: Milena Olech <milena.olech@intel.com>
> Signed-off-by: Maciek Machnikowski <maciek@machnikowski.net>

[...]

>   
> +static int nsim_set_ts_config(struct net_device *netdev,
> +			      struct kernel_hwtstamp_config *config,
> +			      struct netlink_ext_ack *extack)
> +{
> +	struct netdevsim *ns = netdev_priv(netdev);
> +	int rx_filter;
> +
> +	if (!ns->phc)
> +		return -EOPNOTSUPP;
> +
> +	switch (config->tx_type) {
> +	case HWTSTAMP_TX_OFF:
> +		WRITE_ONCE(ns->tstamp_config.tx_type, HWTSTAMP_TX_OFF);
> +		break;
> +	case HWTSTAMP_TX_ON:
> +		WRITE_ONCE(ns->tstamp_config.tx_type, HWTSTAMP_TX_ON);
> +		break;
> +	default:
> +		return -ERANGE;
> +	}
> +
> +	switch (config->rx_filter) {
> +	case HWTSTAMP_FILTER_NONE:
> +		rx_filter = HWTSTAMP_FILTER_NONE;
> +		break;
> +	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
> +	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
> +	case HWTSTAMP_FILTER_PTP_V2_EVENT:
> +	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
> +	case HWTSTAMP_FILTER_PTP_V2_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
> +	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
> +	case HWTSTAMP_FILTER_NTP_ALL:
> +	case HWTSTAMP_FILTER_ALL:
> +		rx_filter = HWTSTAMP_FILTER_ALL;
> +		break;
> +	default:
> +		return -ERANGE;
> +	}

nit: technically, you can make sashiko silent in this case by simply swapping
switch statments order :)

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>