Re: [PATCH net RESEND 2/2] net: macb: Use all-frame timestamping for PTPv1 RX filters

[Nicolai Buchwitz <nb@tipi-net.de>]

Hi Kimwoo

On 11.9.2026 10:04, kimwooseok wrote:
> gem_set_hwtst() accepts HWTSTAMP_FILTER_PTP_V1_L4_SYNC and
> HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ without changing rx_bd_control from
> TSTAMP_DISABLED. A successful request thus disables receive 
> timestamping
> while reporting the requested nonempty filter to userspace.
> 
> Handle these two filters through the existing all-frame fallback used
> for HWTSTAMP_FILTER_PTP_V1_L4_EVENT. This enables receive timestamping
> for a superset of the requested packets and returns HWTSTAMP_FILTER_ALL
> to describe the configuration actually selected.
> 
> Fixes: ab91f0a9b5f4 ("net: macb: Add hardware PTP support")
> Assisted-by: GPT-6 Astra
> Signed-off-by: kimwooseok <5mghybrid@khu.ac.kr>
> ---
> Resending as plain text because the previous webmail submission 
> included
> HTML and quoted and rewrapped the patch. No code changes; the 
> Assisted-by
> trailer now names the tool.
> 
>  drivers/net/ethernet/cadence/macb_ptp.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_ptp.c 
> b/drivers/net/ethernet/cadence/macb_ptp.c
> index 51659bb..2ffc46b 100644
> --- a/drivers/net/ethernet/cadence/macb_ptp.c
> +++ b/drivers/net/ethernet/cadence/macb_ptp.c
> @@ -430,10 +430,6 @@ int gem_set_hwtst(struct net_device *netdev,
>  	switch (tstamp_config->rx_filter) {
>  	case HWTSTAMP_FILTER_NONE:
>  		break;
> -	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> -		break;
> -	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
> -		break;
>  	case HWTSTAMP_FILTER_PTP_V2_EVENT:
>  	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
>  	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
> @@ -448,6 +444,8 @@ int gem_set_hwtst(struct net_device *netdev,
>  		regval = macb_readl(bp, NCR);
>  		macb_writel(bp, NCR, (regval | MACB_BIT(SRTSM)));
>  		break;
> +	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
>  	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
>  	case HWTSTAMP_FILTER_ALL:
>  		rx_bd_control = TSTAMP_ALL_FRAMES;


Reviewed-by: Nicolai Buchwitz <nb@tip-net.de>
Tested-by: Nicolai Buchwitz <nb@tipi-net.de> # Raspberry Pi CM5

Thanks,
Nicolai